Skocz do pozycji: 1.

Tytuł:

Oliwka europejska (Olea europaea) – najdłużej żyjący organizm w śródziemnomorskiej Europie
European olive (Olea europaea) – the longest living organism in Mediterranean Europe

Autorzy:

Boratyński, Adam
Boratyńska, Krystyna
Borkowski, Krzysztof

Powiązania:

https://bibliotekanauki.pl/articles/1196168.pdf

Data publikacji:

2021-04-27

Wydawca:

Polskie Towarzystwo Dendrologiczne

Tematy:

olive trees
monumental trees
Mediterranean basin

Opis:

Olea europaea is the most emblematic tree of the Mediterranean region. It has been cultivated for about 6000 years for its fruit, oil, wood, and for medicinal and cultural purposes. The research data concerns the monumental olive trees in the region. The oldest and biggest known trees are in Lebanon, Israel, Greece, Albania and Italy. The oldest of those, ‘Sisters of Noahʼ (Lebanon) are believed to be 5000–6000 years old. The most numerous groups of monumental olives were reported from Apulia in Italy and Albania. The oldest and biggest olive trees could be remnants of ancient plantations from the Hellenic and Roman times, but this hypothesis should be confirmed in a detailed study.

Źródło:

Rocznik Polskiego Towarzystwa Dendrologicznego; 2020, 68; 11-33
2080-4164
2300-8326

Pojawia się w:

Rocznik Polskiego Towarzystwa Dendrologicznego

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:

On Independent [1, 2]-Sets in Trees

Autorzy:

Aleid, Sahar A.
Cáceres, José
Puertas, María Luz

Powiązania:

https://bibliotekanauki.pl/articles/31342284.pdf

Data publikacji:

2018-08-01

Wydawca:

Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii

Tematy:

domination
independence
spanning trees
excellent trees

Opis:

An [1, k]-set S in a graph G is a dominating set such that every vertex not in S has at most k neighbors in it. If the additional requirement that the set must be independent is added, the existence of such sets is not guaranteed in every graph. In this paper we solve some problems previously posed by other authors about independent [1, 2]-sets. We provide a necessary condition for a graph to have an independent [1, 2]-set, in terms of spanning trees, and we prove that this condition is also sufficient for cactus graphs. We follow the concept of excellent tree and characterize the family of trees such that any vertex belongs to some independent [1, 2]-set. Finally, we describe a linear algorithm to decide whether a tree has an independent [1, 2]-set. This algorithm can be easily modified to obtain the cardinality of a smallest independent [1, 2]-set of a tree.

Źródło:

Discussiones Mathematicae Graph Theory; 2018, 38, 3; 645-660
2083-5892

Pojawia się w:

Discussiones Mathematicae Graph Theory

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 3.

Tytuł:

Completely Independent Spanning Trees in (Partial) k-Trees

Autorzy:

Matsushita, Masayoshi
Otachi, Yota
Araki, Toru

Powiązania:

https://bibliotekanauki.pl/articles/31339419.pdf

Data publikacji:

2015-08-01

Wydawca:

Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii

Tematy:

completely independent spanning trees
partial k-trees

Opis:

Two spanning trees T₁ and T₂ of a graph G are completely independent if, for any two vertices u and v, the paths from u to v in T₁ and T₂ are internally disjoint. For a graph G, we denote the maximum number of pairwise completely independent spanning trees by cist(G). In this paper, we consider cist(G) when G is a partial k-tree. First we show that ⌈k/2⌉ ≤ cist(G) ≤ k − 1 for any k-tree G. Then we show that for any p ∈ {⌈k/2⌉, . . ., k − 1}, there exist infinitely many k-trees G such that cist(G) = p. Finally we consider algorithmic aspects for computing cist(G). Using Courcelle’s theorem, we show that there is a linear-time algorithm that computes cist(G) for a partial k-tree, where k is a fixed constant.

Źródło:

Discussiones Mathematicae Graph Theory; 2015, 35, 3; 427-437
2083-5892

Pojawia się w:

Discussiones Mathematicae Graph Theory

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 4.

Tytuł:

European silver fir - an alternative for the dying Norway spruce in Bialowieza Forest?

Autorzy:

Marozau, Aleh
Mielcarek, Miłosz
Krok, Grzegorz
Paluch, Rafał
Chilinski, Krzysztof

Powiązania:

https://bibliotekanauki.pl/articles/2041262.pdf

Data publikacji:

2021

Wydawca:

Instytut Badawczy Leśnictwa

Tematy:

artificial origin
old trees
adult generation
trees conditions

Opis:

The condition of Norway spruce (Picea abies (L.) Karst) in the Białowieża Forest is categorized as a crisis. It is believed that due to the cooling in the Holocene, the then-relict species of the forest, silver fir (Abies alba Mill.), disappeared from its ecosystems and then spruce appeared. Today’s climate change presents challenges to our civilization, including to forestry. However, there is no information at all about how this affected the silver fir in the Białowieża Forest. In the Polish part of the forest (subcompartment 498 Сi, Białowieża Forest District), for the first time a comprehensive study has been carried out on the condition of mature fir trees planted by man and on their progeny. The results indicate high forestry-taxation indicators of trees, resistance to the abiotic factor and competitiveness. Their constitution corresponds to local environmental conditions. However, the disproportionately small number of adult natural regeneration of old firs indicated some kind of malfunction in the mechanism of natural generational change.

Źródło:

Folia Forestalia Polonica. Series A . Forestry; 2021, 63, 2; 150-166
0071-6677

Pojawia się w:

Folia Forestalia Polonica. Series A . Forestry

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 5.

Tytuł:

Arbitrarily vertex decomposable caterpillars with four or five leaves

Autorzy:

Cichacz, Sylwia
Görlich, Agnieszka
Marczyk, Antoni
Przybyło, Jakub
Woźniak, Mariusz

Powiązania:

https://bibliotekanauki.pl/articles/743967.pdf

Data publikacji:

2006

Wydawca:

Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii

Tematy:

arbitrarily vertex decomposable graphs
trees
caterpillars
star-like trees

Opis:

A graph G of order n is called arbitrarily vertex decomposable if for each sequence (a₁,...,aₖ) of positive integers such that a₁+...+aₖ = n there exists a partition (V₁,...,Vₖ) of the vertex set of G such that for each i ∈ {1,...,k}, $V_i$ induces a connected subgraph of G on $a_i$ vertices. D. Barth and H. Fournier showed that if a tree T is arbitrarily vertex decomposable, then T has maximum degree at most 4. In this paper we give a complete characterization of arbitrarily vertex decomposable caterpillars with four leaves. We also describe two families of arbitrarily vertex decomposable trees with maximum degree three or four.

Źródło:

Discussiones Mathematicae Graph Theory; 2006, 26, 2; 291-305
2083-5892

Pojawia się w:

Discussiones Mathematicae Graph Theory

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 6.

Tytuł:

The Smallest Harmonic Index of Trees with Given Maximum Degree

Autorzy:

Rasi, Reza
Sheikholeslami, Seyed Mahmoud

Powiązania:

https://bibliotekanauki.pl/articles/31342320.pdf

Data publikacji:

2018-05-01

Wydawca:

Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii

Tematy:

harmonic index
trees

Opis:

The harmonic index of a graph G, denoted by H(G), is defined as the sum of weights 2/[d(u) + d(v)] over all edges uv of G, where d(u) denotes the degree of a vertex u. In this paper we establish a lower bound on the harmonic index of a tree T.

Źródło:

Discussiones Mathematicae Graph Theory; 2018, 38, 2; 499-513
2083-5892

Pojawia się w:

Discussiones Mathematicae Graph Theory

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 7.

Tytuł:

Extensions of the minimum labelling spanning tree problem

Autorzy:

Cerulli, R.
Fink, A.
Gentili, M.
Voss, S.

Powiązania:

https://bibliotekanauki.pl/articles/308930.pdf

Data publikacji:

2006

Wydawca:

Instytut Łączności - Państwowy Instytut Badawczy

Tematy:

network design
metaheuristics
spanning trees
labelling trees
Steiner tree problem

Opis:

In this paper we propose some extensions of the minimum labelling spanning tree problem. The main focus is on the minimum labelling Steiner tree problem: given a graph G with a color (label) assigned to each edge, and a subset Q of the nodes of G (basic vertices), we look for a connected subgraph of G with the minimum number of different colors covering all the basic vertices. The problem has several applications in telecommunication networks, electric networks, multimodal transportation networks, among others, where one aims to ensure connectivity by means of homogeneous connections. Numerical results for several metaheuristics to solve the problem are presented.

Źródło:

Journal of Telecommunications and Information Technology; 2006, 4; 39-45
1509-4553
1899-8852

Pojawia się w:

Journal of Telecommunications and Information Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 8.

Tytuł:

Note: Sharp Upper and Lower Bounds on the Number of Spanning Trees in Cartesian Product of Graphs

Autorzy:

Azarija, Jernej

Powiązania:

https://bibliotekanauki.pl/articles/30098147.pdf

Data publikacji:

2013-09-01

Wydawca:

Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii

Tematy:

Cartesian product graphs
spanning trees
number of spanning trees
inequality

Opis:

Let $ G_1 $ and $ G_2 $ be simple graphs and let $ n_1 = |V (G_1)| $, $ m_1 = |E(G_1)| $ , $ n_2 = |V (G_2)|$ and $ m_2 = |E(G_2)|$. In this paper we derive sharp upper and lower bounds for the number of spanning trees $ \tau $ in the Cartesian product $ G_1 \square G_2 $ of $ G_1 $ and $ G_2 $. We show that: $$ \tau (G_1 \square G_2 ) \geq \frac{2(n_1-1)(n_2-1)}{n_1 n_2} (\tau (G_1) n_1 )^\frac{n_2+1}{2} (\tau(G_2)n_2)^\frac{n_1+1}{2} $$ and $$ \tau(G_1 \square G_2 ) \leq \tau (G_1) \tau (G_2) \left[ \frac{2m_1}{n_1-1} + \frac{2m_2}{n_2-1} \right]^{(n_1 - 1)(n_2 -1)} . $$ We also characterize the graphs for which equality holds. As a by-product we derive a formula for the number of spanning trees in $ K_{n_1} \square K_{n_2} $ which turns out to be $ n_1^{n_1-2} n_2^{n_2-2} (n_1 + n_2 )^{(n_1-1)(n_2-1)} $.

Źródło:

Discussiones Mathematicae Graph Theory; 2013, 33, 4; 785-790
2083-5892

Pojawia się w:

Discussiones Mathematicae Graph Theory

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 9.

Tytuł:

Monument trees in the Kampinos National Park (Central Poland): A review

Autorzy:

Szczepkowski, Andrzej
Tyburski, Łukasz
Sułkowska, Małgorzata

Powiązania:

https://bibliotekanauki.pl/articles/2041515.pdf

Data publikacji:

2020

Wydawca:

Instytut Badawczy Leśnictwa

Tematy:

Kampinos Forest
very large trees
venerable trees
natural monument
nature conservation

Opis:

The paper presents the history of the protection of trees with special values, the current state of monument trees and the preliminary description of trees meeting the minimal circumference criteria to be regarded as natural monuments in the Kampinos National Park (KNP). The study was conducted in the years 2017–2019. In the KNP, there are 69 living trees with a status of natural monuments. Most of them are oaks – 56 specimens, Scots pine – 6 specimens, small-leaved lime – 5 specimens and European hornbeam and European ash – 1 specimen each. Among all, 27 trees grow individually and the other 42 grow in 7 groups. About 200 trees were recognised as meeting the minimal circumference criteria to be regarded as natural monuments. The thickest size tree in the KNP is the black poplar with a circumference of 805 cm, growing in the enclave of Ruska Kępa, and the thickest monument tree in the KNP area is Dąb Kobędzy (Kobendza Oak) with a circumference of 582 cm. Almost a half of the living monument trees (34 specimens) are situated in Kampinos Forest District. In Kromnów, there are 20, and in Laski Forest District 15 specimens of monument trees are mapped. Living monument trees were found in 15 (out of 17) forest subdistricts. The highest number of monument trees was found in Rózin Forest Subdistrict (16) and in Wilków Forest Subdistrict (10). The lowest number – one specimen per forest subdistrict – was found in six forest subdistricts (Dąbrówka, Grabina, Janówek, Krzywa Góra, Rybitew and Zamczysko). In total, there are around 300 specimens of natural monuments and trees meeting the minimal circumference criteria to be regarded as natural monuments, which means that there is one tree of this category for each 125 ha surface of the KNP.

Źródło:

Folia Forestalia Polonica. Series A . Forestry; 2020, 62, 3; 210-219
0071-6677

Pojawia się w:

Folia Forestalia Polonica. Series A . Forestry

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 10.

Tytuł:

A note on the p-domination number of trees

Autorzy:

Lu, Y.
Hou, X.
Xu, J.-M.

Powiązania:

https://bibliotekanauki.pl/articles/255183.pdf

Data publikacji:

2009

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH

Tematy:

p-domination number
trees

Opis:

Let p be a positive integer and G = (V (G), E(G)) a graph. A p-dominating set of G is a subset S of V (G) such that every vertex not in S is dominated by at least p vertices in S. The p-domination number ϒp(G) is the minimum cardinality among the p-dominating sets of G. Let T be a tree with order n ≥ 2 and p ≥ 2 a positive integer. A vertex of V (T) is a p-leaf if it has degree at most p - 1, while a p-support vertex is a vertex of degree at least p adjacent to a p-leaf. In this note, we show that ϒp(T) ≥ (n + /Lp(T)/ - /Sp(T)/)/2, where Lp(T) and Sp(T) are the sets of p-leaves and p-support vertices of T, respectively. Moreover, we characterize all trees attaining this lower bound.

Źródło:

Opuscula Mathematica; 2009, 29, 2; 157-164
1232-9274
2300-6919

Pojawia się w:

Opuscula Mathematica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 11.

Tytuł:

On the dominator colorings in trees

Autorzy:

Merouane, Houcine
Chellali, Mustapha

Powiązania:

https://bibliotekanauki.pl/articles/743280.pdf

Data publikacji:

2012

Wydawca:

Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii

Tematy:

dominator coloring
domination
trees

Opis:

In a graph G, a vertex is said to dominate itself and all its neighbors. A dominating set of a graph G is a subset of vertices that dominates every vertex of G. The domination number γ(G) is the minimum cardinality of a dominating set of G. A proper coloring of a graph G is a function from the set of vertices of the graph to a set of colors such that any two adjacent vertices have different colors. A dominator coloring of a graph G is a proper coloring such that every vertex of V dominates all vertices of at least one color class (possibly its own class). The dominator chromatic number $χ_d(G)$ is the minimum number of color classes in a dominator coloring of G. Gera showed that every nontrivial tree T satisfies $γ(T)+1 ≤ χ_d(T) ≤ γ(T)+2$. In this note we characterize nontrivial trees T attaining each bound.

Źródło:

Discussiones Mathematicae Graph Theory; 2012, 32, 4; 677-683
2083-5892

Pojawia się w:

Discussiones Mathematicae Graph Theory

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 12.

Tytuł:

Vertices Contained In All Or In No Minimum Semitotal Dominating Set Of A Tree

Autorzy:

Henning, Michael A.
Marcon, Alister J.

Powiązania:

https://bibliotekanauki.pl/articles/31341173.pdf

Data publikacji:

2016-02-01

Wydawca:

Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii

Tematy:

domination
semitotal domination
trees

Opis:

Let G be a graph with no isolated vertex. In this paper, we study a parameter that is squeezed between arguably the two most important domination parameters; namely, the domination number, γ(G), and the total domination number, γ_t(G). A set S of vertices in a graph G is a semitotal dominating set of G if it is a dominating set of G and every vertex in S is within distance 2 of another vertex of S. The semitotal domination number, γ_t2(G), is the minimum cardinality of a semitotal dominating set of G. We observe that γ(G) ≤ γ_t2(G) ≤ γ_t(G). We characterize the set of vertices that are contained in all, or in no minimum semitotal dominating set of a tree.

Źródło:

Discussiones Mathematicae Graph Theory; 2016, 36, 1; 71-93
2083-5892

Pojawia się w:

Discussiones Mathematicae Graph Theory

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 13.

Tytuł:

Najstarsze drzewa Arboretum Kórnickiego: zarys historii kolekcji dendrologicznej na trzech planach parku
The oldest trees in the Kórnik Arboretum: outline of the history of its dendrological collection on three maps of the park

Autorzy:

Nowak, Kinga

Powiązania:

https://bibliotekanauki.pl/articles/1196161.pdf

Data publikacji:

2021-04-27

Wydawca:

Polskie Towarzystwo Dendrologiczne

Tematy:

Kórnik
oldest trees
Kórnik Arboretum

Opis:

The Kórnik Arboretum, now called the Arboretum of the Institute of Dendrology of the Polish Academy of Sciences, has a long and rich history dating back to the 18th-century garden of Teofila Szołdrska-Potulicka, although the collection began in 1826, when count Tytus Działyński began rebuilding the garden. Thanks to the great care of shown by the owners of Kórnik, as well as generations of people working there, numerous sources have been preserved that allow us to trace the changes that took place in this area, as well as to refer to the history of many of the park’s trees. Gathering information from these sources and comparing them with modern data is the subject of this article, which is intended to link the beginnings of the Arboretum with the present.

Źródło:

Rocznik Polskiego Towarzystwa Dendrologicznego; 2020, 68; 63-76
2080-4164
2300-8326

Pojawia się w:

Rocznik Polskiego Towarzystwa Dendrologicznego

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 14.

Tytuł:

Graphs with equal domination and 2-distance domination numbers

Autorzy:

Raczek, Joanna

Powiązania:

https://bibliotekanauki.pl/articles/743916.pdf

Data publikacji:

2011

Wydawca:

Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii

Tematy:

domination number
trees
unicyclic graphs

Opis:

Let G = (V,E) be a graph. The distance between two vertices u and v in a connected graph G is the length of the shortest (u-v) path in G. A set D ⊆ V(G) is a dominating set if every vertex of G is at distance at most 1 from an element of D. The domination number of G is the minimum cardinality of a dominating set of G. A set D ⊆ V(G) is a 2-distance dominating set if every vertex of G is at distance at most 2 from an element of D. The 2-distance domination number of G is the minimum cardinality of a 2-distance dominating set of G. We characterize all trees and all unicyclic graphs with equal domination and 2-distance domination numbers.

Źródło:

Discussiones Mathematicae Graph Theory; 2011, 31, 2; 375-385
2083-5892

Pojawia się w:

Discussiones Mathematicae Graph Theory

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 15.

Tytuł:

On Unique Minimum Dominating Sets in Some Cartesian Product Graphs

Autorzy:

Hedetniemi, Jason T.

Powiązania:

https://bibliotekanauki.pl/articles/31339313.pdf

Data publikacji:

2015-11-01

Wydawca:

Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii

Tematy:

vertex domination
graph products
trees

Opis:

Unique minimum vertex dominating sets in the Cartesian product of a graph with a complete graph are considered. We first give properties of such sets when they exist. We then show that when the first factor of the product is a tree, consideration of the tree alone is sufficient to determine if the product has a unique minimum dominating set.

Źródło:

Discussiones Mathematicae Graph Theory; 2015, 35, 4; 615-628
2083-5892

Pojawia się w:

Discussiones Mathematicae Graph Theory

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 16.

Tytuł:

Strategia zachowania drzew weteranów w mieście – model postępowania oparty o mechanizmy obronne roślin i ideę zrównoważonego rozwoju
Strategy for preservation of veteran trees in the city – a model of conduct based on plant defense mechanisms and the idea of sustainable development

Autorzy:

Rosłon-Szeryńska, E.
Fortuna-Antoszkiewicz, B.
Łukaszkiewicz, J.
Borowski, J.

Powiązania:

https://bibliotekanauki.pl/articles/400132.pdf

Data publikacji:

2018

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

drzewa sędziwe
drzewa weterani
arborystyka
gospodarka drzewostanem
pielęgnacja drzew sędziwych
veteran trees
ancient trees
arboristics
tree stand management
maintenance of old trees

Opis:

Choć badania nad mechanizmami obronnymi drzew prowadzono w latach 30-tych XX wieku, to dopiero w połowie lat 80-tych, pod wpływem publikacji Alexa Shigo, rozpoczął się ruch arborystyczny, który opierał się na zrozumieniu mechanizmów obronnych, fizjologii wzrostu i rozwoju drzew. Zrównoważone podejście do kształtowania, sadzenia, pielęgnacji i ochrony drzew w różnym wieku wciąż ewoluuje. Zmiany obejmują szczególnie okazy sędziwe pod względem wieku oraz weterani, wobec których stosowano jeszcze niedawno inwazyjne metody leczenia i pielęgnacji. Celem niniejszego opracowania jest przedstawienie modelu postępowania z drzewami sędziwymi. Badaniami objęto reprezentatywną grupę 400 egzemplarzy starszych drzew o wybitnej wartości przyrodniczej, historycznej i krajobrazowej, zlokalizowanych na obszarach zieleni komponowanej (parki, skwery, zieleń uliczna) m.st. Warszawy. Drzewa te narażone są na silną antropopresję i przyspieszoną degradację z powodu niekorzystnych warunków siedliskowych i urbanizacji. Przedstawiono sposób waloryzacji tych drzew, oceny ich stanu zdrowotnego i żywotności z uwzględnieniem aspektu bezpieczeństwa ludzi i ich mienia. Określono zasady postępowania z przedmiotowymi drzewami, aby poprawić ich funkcje biologiczne i mechaniczne, a także zminimalizować ryzyko wypadku.
Although the research on the defense mechanisms of trees was carried out in the 1930s, it was not until the mid-1980s that – under the influence of Alex Shigo – an arborist movement began, which was based on understanding defense mechanisms, growth physiology and development of trees. A balanced approach to shaping, planting, care and protection of trees at different ages is still evolving. The changes include particularly the venerable specimens, for until recently invasive methods of treatment and care were used. The aim of this paper is to present a model for dealing with veteran trees. The research included a representative sample of 400 older trees with outstanding natural, historical and landscape value, located in greenery areas (parks, squares, street greenery). These trees are exposed to strong anthropogenic pressure and accelerated degradation due to unfavorable habitat conditions and urbanization processes. The method of valorisation of these trees, assessment of their health status and vitality with regard to the aspect of human safety and their property is presented. The rules for dealing with the trees in question have been defined to improve their biological and mechanical functions as well as to minimize the risk of an accident.

Źródło:

Inżynieria Ekologiczna; 2018, 19, 4; 12-21
2081-139X
2392-0629

Pojawia się w:

Inżynieria Ekologiczna

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 17.

Tytuł:

Graphs with Large Generalized (Edge-)Connectivity

Autorzy:

Li, Xueliang
Mao, Yaping

Powiązania:

https://bibliotekanauki.pl/articles/31340594.pdf

Data publikacji:

2016-11-01

Wydawca:

Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii

Tematy:

(edge-)connectivity
Steiner tree
internally disjoint trees
edge-disjoint trees
packing
generalized (edge-)connectivity

Opis:

The generalized $k$-connectivity $ \kappa_k (G) $ of a graph $G$, introduced by Hager in 1985, is a nice generalization of the classical connectivity. Recently, as a natural counterpart, we proposed the concept of generalized $k$-edge-connectivity $ \lambda_k (G)$. In this paper, graphs of order $n$ such that $ \kappa_k (G) = n - k/2 - 1 $ and $ \lambda_k (G) = n - k/2 - 1 $ for even $k$ are characterized.

Źródło:

Discussiones Mathematicae Graph Theory; 2016, 36, 4; 931-958
2083-5892

Pojawia się w:

Discussiones Mathematicae Graph Theory

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 18.

Tytuł:

On some families of arbitrarily vertex decomposable spiders

Autorzy:

Juszczyk, T.
Zioło, I. A.

Powiązania:

https://bibliotekanauki.pl/articles/254779.pdf

Data publikacji:

2010

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH

Tematy:

arbitrarily vertex decomposable graph
trees

Opis:

A graph G of order n is called arbitrarily vertex decomposable if for each sequence (n1, . . . , nk) of positive integers such that [formula], there exists a partition (V1, . . . , Vk) of the vertex set of G such that for every i ∈ {1, . . . , k} the set Vi induces a connected subgraph of G on ni vertices. A spider is a tree with one vertex of degree at least 3. We characterize two families of arbitrarily vertex decomposable spiders which are homeomorphic to stars with at most four hanging edges.

Źródło:

Opuscula Mathematica; 2010, 30, 2; 147-154
1232-9274
2300-6919

Pojawia się w:

Opuscula Mathematica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 19.

Tytuł:

The Infestation Degree of Trees with Common Mistletoe Viscum album L. and their Health Status (on the Example of Praszka City)

Autorzy:

Gołąbek, E.
Sławiński, J.

Powiązania:

https://bibliotekanauki.pl/articles/123572.pdf

Data publikacji:

2017

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

Viscum album L.
common mistletoe
degree of trees settlement
health condition of trees
Praszka

Opis:

The research was carried out in September and October 2013. Their main aim was to obtain the information on the abundance and distribution of the common mistletoe in Praszka, assess the health status of the trees infested with this semi-parasite, and to determine its impact on the health of the hosts. All the trees with mistletoe were examined (in terms of the species, the number of semiparasite shrubs, the host health). The distribution and density hosts were presented on a prepared network with an area of 1 ha and Pearson’s correlation factor was used to determine the relationship between the infestation degree of a host and its state of health. Only the typical subspecies of mistletoe – Viscum album L. subsp. album, which occupied 11 species of trees were found in the city of Praszka. These were mainly: black poplar Populus nigra L., small-leaved lime Tilia cordata L. and black locust Robinia pseudoacacia L. (they are also the most common or the frequent hosts in the country). The distribution of mistletoe in the city is uneven, and this is mainly due to the degree of urbanization, sunshine, noise, occurrence of the most common hosts as well as the presence of birds. It turned out that the largest groups of hosts were located along the roads in low building areas, on the peripheries of the city as well as in parks and cemeteries. The health condition of trees inhabited by mistletoe was generally good. There was a correlation between the number of mistletoe shrubs on the host and its health status (the greater the number of shrubs, the worse the health status of the host).

Źródło:

Journal of Ecological Engineering; 2017, 18, 6; 80-85
2299-8993

Pojawia się w:

Journal of Ecological Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 20.

Tytuł:

Statystyczna analiza aktywności edukacyjnej osób dorosłych w Polsce
Statistical analysis of the educational activityof adults in Poland

Autorzy:

Grześkowiak, Alicja

Powiązania:

https://bibliotekanauki.pl/articles/425280.pdf

Data publikacji:

2013

Wydawca:

Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu

Tematy:

statistical analysis
continuous learning
classification trees

Opis:

The objective of this paper is to assess the participation of adults in Poland in lifelong learning. The participation in education of Poles aged 25-64 was analyzed at three levels: national, regional and individual. The data at the national level were confronted with the situation in Europe and the data at the voivodeships level were considered in the context of regional competitiveness. The main factors influencing the educational involvement at the individual level were detected by the application of classification trees. The results of the analysis indicate that lifelong learning in Poland is not sufficiently developed and some regional differences occur in this field. The educational attainment was found as the most important determinant of the participation in continuous learning.

Źródło:

Econometrics. Ekonometria. Advances in Applied Data Analytics; 2013, 2(40); 22-35
1507-3866

Pojawia się w:

Econometrics. Ekonometria. Advances in Applied Data Analytics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 21.

Tytuł:

On the Application of Classification and Regression Trees in Medical Diagnosis
O zastosowaniu drzew klasyfikacyjnych i regresyjnych w diagnostyce medycznej

Autorzy:

Misztal, Małgorzata

Powiązania:

https://bibliotekanauki.pl/articles/904694.pdf

Data publikacji:

2005

Wydawca:

Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego

Tematy:

classification and regression trees
medical diagnosis

Opis:

Drzewo decyzyjne jest graficzną prezentacją metody rekurencyjnego podziału. Metoda ta polega na stopniowym podziale zbioru obiektów na rozłączne podzbiory aż do momentu uzyskania ich jednorodności ze względu na wyróżnioną cechę y. Gdy у jest zmienną nominalną, mamy do czynienia z nieparametryczną analizą dyskryminacji (drzewa klasyfikacyjne), gdy zaś jest zmienną ilościową z nieparametryczną analizą regresji (drzewa regresyjne). W referacie przedstawiono możliwości zastosowań drzew regresyjnych i klasyfikacyjnych do rozwiązywania problemów o charakterze decyzyjnym w diagnostyce medycznej.
Decision tree is a graphical presentation of the recursive partitioning the learning set into homogenous subsets considering dependent variable y. If dependent variable у is nominal we deal with nonparametric discriminant analysis (classification trees), when у is numerical - with nonparametric regression analysis (regression trees). The aim of the paper is to present some applications of regression and classification trees in medical diagnosis for solving decision - making problems.

Źródło:

Acta Universitatis Lodziensis. Folia Oeconomica; 2005, 194
0208-6018
2353-7663

Pojawia się w:

Acta Universitatis Lodziensis. Folia Oeconomica

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 22.

Tytuł:

Characterization of trees with equal 2-domination number and domination number plus two

Autorzy:

Chellali, Mustapha
Volkmann, Lutz

Powiązania:

https://bibliotekanauki.pl/articles/743587.pdf

Data publikacji:

2011

Wydawca:

Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii

Tematy:

2-domination number
domination number
trees

Opis:

Let G = (V(G),E(G)) be a simple graph, and let k be a positive integer. A subset D of V(G) is a k-dominating set if every vertex of V(G) - D is dominated at least k times by D. The k-domination number γₖ(G) is the minimum cardinality of a k-dominating set of G. In [5] Volkmann showed that for every nontrivial tree T, γ₂(T) ≥ γ₁(T)+1 and characterized extremal trees attaining this bound. In this paper we characterize all trees T with γ₂(T) = γ₁(T)+2.

Źródło:

Discussiones Mathematicae Graph Theory; 2011, 31, 4; 687-697
2083-5892

Pojawia się w:

Discussiones Mathematicae Graph Theory

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 23.

Tytuł:

Cyclic decompositions of complete graphs into spanning trees

Autorzy:

Froncek, Dalibor

Powiązania:

https://bibliotekanauki.pl/articles/744515.pdf

Data publikacji:

2004

Wydawca:

Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii

Tematy:

graph factorization
graph labelling
spanning trees

Opis:

We examine decompositions of complete graphs with an even number of vertices, $K_{2n}$, into n isomorphic spanning trees. While methods of such decompositions into symmetric trees have been known, we develop here a more general method based on a new type of vertex labelling, called flexible q-labelling. This labelling is a generalization of labellings introduced by Rosa and Eldergill.

Źródło:

Discussiones Mathematicae Graph Theory; 2004, 24, 2; 345-353
2083-5892

Pojawia się w:

Discussiones Mathematicae Graph Theory

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 24.

Tytuł:

Wykorzystanie drzew sufiksowych do efektywnej prezentacji podobieństw sesji z systemu pułapek honeypot

Autorzy:

Skłodowski, Jakub
Arabas, Piotr

Powiązania:

https://bibliotekanauki.pl/articles/13949978.pdf

Data publikacji:

2023-02-20

Wydawca:

Akademia Sztuki Wojennej

Tematy:

honeypots
malware
session analysis
suffix trees

Opis:

The article presents a prototype of a system for analyzing data from a honeypot network. A special attention is paid to finding similarities in the collected ssh sessions. The algorithm proposed looks for generalized patterns in the session using suffix trees. The patterns can be used for a convenient presentation of the displayed sessions and for searching. The examples of analysis carried out with the help of the algorithm are presented.

Źródło:

Cybersecurity and Law; 2023, 9, 1; 298-315
2658-1493

Pojawia się w:

Cybersecurity and Law

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 25.

Tytuł:

End Simplicial Vertices in Path Graphs

Autorzy:

Gutierrez, Marisa
Tondato, Silvia B.

Powiązania:

https://bibliotekanauki.pl/articles/31340940.pdf

Data publikacji:

2016-05-01

Wydawca:

Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii

Tematy:

chordal graphs
clique trees
path graphs

Opis:

A graph is a path graph if there is a tree, called UV -model, whose vertices are the maximal cliques of the graph and for each vertex x of the graph the set of maximal cliques that contains it induces a path in the tree. A graph is an interval graph if there is a UV -model that is a path, called an interval model. Gimbel [3] characterized those vertices in interval graphs for which there is some interval model where the interval corresponding to those vertices is an end interval. In this work, we give a characterization of those simplicial vertices x in path graphs for which there is some UV -model where the maximal clique containing x is a leaf in this UV -model.

Źródło:

Discussiones Mathematicae Graph Theory; 2016, 36, 2; 393-408
2083-5892

Pojawia się w:

Discussiones Mathematicae Graph Theory

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 26.

Tytuł:

Invariant operators on function spaces on homogeneous trees

Autorzy:

Cowling, Michael
Meda, Stefano
Setti, Alberto

Powiązania:

https://bibliotekanauki.pl/articles/965849.pdf

Data publikacji:

1999

Wydawca:

Polska Akademia Nauk. Instytut Matematyczny PAN

Tematy:

spherical functions
harmonic analysis
homogeneous trees

Źródło:

Colloquium Mathematicum; 1999, 80, 1; 53-61
0010-1354

Pojawia się w:

Colloquium Mathematicum

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 27.

Tytuł:

On the formal inverse of polynomial endomorphisms

Autorzy:

Ossowski, Piotr

Powiązania:

https://bibliotekanauki.pl/articles/966098.pdf

Data publikacji:

1998

Wydawca:

Polska Akademia Nauk. Instytut Matematyczny PAN

Tematy:

rooted trees
Jacobian Conjecture
polynomial automorphisms

Źródło:

Colloquium Mathematicum; 1998, 78, 1; 97-104
0010-1354

Pojawia się w:

Colloquium Mathematicum

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 28.

Tytuł:

Klonowanie najstarszych dębów pomnikowych rosnących w Polsce z wykorzystaniem metody in vitro
Cloning of the oldest monumental oaks growing in Poland using in vitro culture

Autorzy:

Kotlarski, Szymon
Michalak, Marcin
Chmielarz, Paweł

Powiązania:

https://bibliotekanauki.pl/articles/1186041.pdf

Data publikacji:

2020-02-19

Wydawca:

Polskie Towarzystwo Dendrologiczne

Tematy:

Quercus robur
micropropagation
old trees
shoots

Opis:

W ostatnich latach obserwuje się coraz powszechniej występujące zjawisko niszczenia lub samoistnego zamierania pomnikowych dębów szypułkowych (Quercus robur L.), których wiek sięga kilkuset lat. W takiej sytuacji kluczowe jest zachowanie zasobów genowych, szczególnie w przypadku sędziwych drzew, które obok znaczenia kulturowego mają wiele cennych cech odporności na zmieniające się czynniki środowiskowe, ukształtowane na przestrzeni setek lat. Metoda wegetatywnego rozmnażania dębów tradycyjnymi technikami nie jest możliwa, ponieważ pędy dębów nie ukorzeniają się poprzez zrzezy czy odkłady, a szczepienie nie daje jednorodnej genetycznie rośliny z pędem i korzeniem. Dodatkowo proces ukorzeniania się pędów jest szczególnie nieskuteczny w przypadku wiekowych dębów, dlatego niezbędne było sięgnięcie po techniki kultur tkankowych. W naszych badaniach testowaliśmy możliwość klonowania z wykorzystaniem metody in vitro 21 dębów pomnikowych z terenu Polski, w wieku 300–800 lat. Metoda ta polegała na pobraniu zdrewniałych pędów z pąkami śpiącymi, które następnie trzymano w hodowli wazonowej w fitotronie w celu uzyskania z nich pędów odroślowych. Fragmenty tych pędów odkażono i namnożono na pożywce agarowej, zawierającej niezbędne składniki odżywcze oraz regulatory wzrostu. Wybrane z hodowli in vitro pędy ukorzeniono na pożywce z dodatkiem węgla aktywnego. Tylko kilka z badanych dębów pomnikowych wykazywało potencjał do mikrorozmnażania. Były wśród nich i te najstarsze z testowanych drzew. Ukorzenione pędy po zahartowaniu przeniesiono w podłoże stałe (Chmielarz et al., 2016). W ten sposób sklonowano około 800–letni dąb Rus z Rogalina i Dąb Wybickiego z Muzeum Hymnu Narodowego w Będominie, liczący około 400 lat. W kwietniu 2019 r. otrzymane sadzonki, o wysokości około 2 m, posadzono w niedalekiej odległości od drzew matecznych.
In recent years a decline of the oldest oaks (often monumental trees) aged up to several hundred years has been observed in Poland. That is why conservation of their genetic resources is crucial. The trees have many valuable traits of resistance to changing environmental factors, which allowed them to survive in a changing environment. Vegetative propagation of oaks by using traditional methods is not possible because they cannot be easily propagated by cuttings. The main goal of our research was to assess the potential of the oldest oaks growing in Poland for regeneration in plant tissue culture. Plant material was collected from 21 monumental oaks. Their lignified shoots were collected at the end of April and next adventitious shoots were induced from them in vase culture. The shoots, used as explants in tissue culture, were propagated and rooted. As a result of this study, correctly growing plantlets (clones) were obtained under ex vitro conditions of several monumental oaks. Among them Rus Oak and The Wybicki Oak. There were no significant correlations between the age or trunk circumference at breast height of the maternal trees and the ability of their adventitious shoots to root in vitro culture, and the success rate of their acclimation. Two cloned monumental trees, Rus Oak and The Wybicki Oak were planted as 2 m high seedlings respectively in Rogalin and Będomin, near their mother trees in April, 2019.

Źródło:

Rocznik Polskiego Towarzystwa Dendrologicznego; 2019, 67; 53-60
2080-4164
2300-8326

Pojawia się w:

Rocznik Polskiego Towarzystwa Dendrologicznego

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 29.

Tytuł:

Monitoring of spruce stands in the Czerwona Woda river catchment of the Stołowe Mountains National Park

Autorzy:

Strzeliński, Paweł
Turski, Mieczysław

Powiązania:

https://bibliotekanauki.pl/articles/2044143.pdf

Data publikacji:

2019

Wydawca:

Instytut Badawczy Leśnictwa

Tematy:

tree biometrics
model trees
Kraft classes

Opis:

In the spring of 2017, Stołowe Mountains National Park started a research program related to the protection of water resources. The research program was started because of, among others, the growing problems of water resources and the dying of spruce trees. One of the projects commissioned by the Park was ‘Monitoring the impact of renaturisation and hydrological status on changes in the biomass of trees and stands’. The monitoring covered spruce stands growing along the main watercourse of the Park (the Czerwona Woda). As a part of the study, three rectangular surfaces (from 0.45 to 0.50 ha) and 10 circular areas (0.04 ha each) were established. On fenced rectangular surfaces, 10 model trees were selected using the Draudt method. They were monitored using hemispheric cameras (changes in crowns), dendrometers (changes in the circumference of stems) and minirhizotronami (changes in the root layer). In addition to the measurements of all the trees on the surface, imaging with terrestrial laser scanning and hemispherical images was done. The data and results presented in this work were created as a result of the implementation of a project financed from funds related to the forestry fund of the State Forests National Forest Holding.

Źródło:

Folia Forestalia Polonica. Series A . Forestry; 2019, 61, 1; 90-95
0071-6677

Pojawia się w:

Folia Forestalia Polonica. Series A . Forestry

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 30.

Tytuł:

Plany zagospodarowania przestrzennego jako instrument zarządzania zieloną infrastrukturą
Land use plans as an instrument for green infrastructure management

Autorzy:

Nowak, Maciej J.
Szulczewska, Barbara
Legutko‑Kobus, Paulina
Giedych, Renata
Oleńczuk-Paszel, Anna

Powiązania:

https://bibliotekanauki.pl/articles/2192755.pdf

Data publikacji:

2023

Wydawca:

Kancelaria Sejmu. Biuro Analiz Sejmowych

Tematy:

green areas
trees
biologically vital area

Opis:

The aim of the article is to present the results of a study on the challenges and barriers related to the role of land use plans in the management of green infrastructure in small and medium-sized cities. This research forms part of a larger project dedicated to analysing the importance of green infrastructure as a natural and social resource of small and medium-sized cities in Poland. The subject of the study are 814 spatial development plans in force in 20 Polish cities (12 medium-sized and 8 small). The selection of these cities was dictated by the assumptions of the research project and related to two basic criteria: the model of the layout of areas covered with vegetation or water and the projected development trajectory. What was analysed in the plans were the patterns of provisions that could be linked to green infrastructure. Provisions concerning green spaces, woodland areas and other specific provisions (which could be linked to green infrastructure) were identified.

Źródło:

Studia BAS; 2023, 1(73); 59-73
2080-2404
2082-0658

Pojawia się w:

Studia BAS

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 31.

Tytuł:

Wycena drzew w przestrzeni publicznej i na terenie jednostek gospodarczych
Valuation of trees in public space and in business

Autorzy:

Szczypa, Piotr

Powiązania:

https://bibliotekanauki.pl/articles/592016.pdf

Data publikacji:

2016

Wydawca:

Uniwersytet Ekonomiczny w Katowicach

Tematy:

Drzewa
Rachunkowość
Wycena
Accounting
Trees
Valuation

Opis:

W praktyce gospodarczej coraz częściej dostrzega się potrzebę ustalenia wiarygodnej oraz porównywalnej informacji o wartości posiadanych drzew przez jednostki gospodarcze i samorządowe. Rachunkowość wskazywana jest jako system zapewniający systematyczny pomiar, wycenę, ewidencję i prezentację informacji w tym zakresie. Regulacje prawne z zakresu rachunkowości, a także dotychczasowe metody wyceny środowiska przyrodniczego nie umożliwiły przeprowadzenia wyceny drzew w systemie rachunkowości jednostek gospodarczych i samorządowych w poszanowaniu obowiązujących zasad rachunkowości. Artykuł ma na celu: 1) przedstawienie czynników wpływających na wartość drzew; 2) wskazanie metody wyceny drzew w systemie rachunkowości. Na potrzeby opracowania przyjęto hipotezę: wartość godziwa to kategoria wyceny drzew, zapewniająca kompleksowe uwzględnienie różnorodnych czynników wpływających na wartość drzew.
In business practice there is an increasingly recognized need to establish a reliable and comparable information on the value of trees owned by companies and governments. Accounting is indicated as system providing systematic measurement, valuation, recording and presentation of information in this regard. Legal regulations of accounting and the existing methods of valuation of the natural environment did not allow to carry out valuation of trees in the accounting system of business and government in compliance with the applicable accounting principles. Article aims to: 1) the presentation of the factors affecting the value of the trees; 2) an indication of the method of valuation of trees in the accounting system. For the purposes of development there was a hypothesis adopted: the fair value is a parameter of trees valuation providing comprehensive consideration of various categories of trees.

Źródło:

Studia Ekonomiczne; 2016, 268; 196-205
2083-8611

Pojawia się w:

Studia Ekonomiczne

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 32.

Tytuł:

Trees in the folk tradition of Slavs
Stromy v lidové tradici Slovanů

Autorzy:

Janyšková, Ilona

Powiązania:

https://bibliotekanauki.pl/articles/2084466.pdf

Data publikacji:

2021

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

Slavonic studies
folklore
ethnolinguistics
dialectology
trees

Opis:

This review deals with a comprehensive publication on the role of trees in the folk tradition of Slavs. The author of the review appreciates the interdisciplinary focus of the book, which is based on deep knowledge in the field of folklore, Slavonic dialectology and etymology. She also highly values the extremely rich material (folklore, ethnographic and linguistic).

Źródło:

Rocznik Slawistyczny; 2021, 70; 203-207
0080-3588

Pojawia się w:

Rocznik Slawistyczny

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 33.

Tytuł:

Bounds On The Disjunctive Total Domination Number Of A Tree

Autorzy:

Henning, Michael A.
Naicker, Viroshan

Powiązania:

https://bibliotekanauki.pl/articles/31341124.pdf

Data publikacji:

2016-02-01

Wydawca:

Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii

Tematy:

total domination
disjunctive total domination
trees

Opis:

Let $G$ be a graph with no isolated vertex. In this paper, we study a parameter that is a relaxation of arguably the most important domination parameter, namely the total domination number, $ \gamma_t(G) $. A set $S$ of vertices in $G$ is a disjunctive total dominating set of $G$ if every vertex is adjacent to a vertex of $S$ or has at least two vertices in $S$ at distance 2 from it. The disjunctive total domination number, $ \gamma_t^d (G) $, is the minimum cardinality of such a set. We observe that $ \gamma_t^d (G) \ge \gamma_t (G) $. A leaf of $G$ is a vertex of degree 1, while a support vertex of $G$ is a vertex adjacent to a leaf. We show that if $T$ is a tree of order $n$ with $ \mathcal{l} $ leaves and $s$ support vertices, then $ 2(n−\mathcal{l}+3) // 5 \le \gamma_t^d (T) \le (n+s−1)//2 $ and we characterize the families of trees which attain these bounds. For every tree $T$, we show have $ \gamma_t(T) // \gamma_t^d (T) <2 $ and this bound is asymptotically tight.

Źródło:

Discussiones Mathematicae Graph Theory; 2016, 36, 1; 153-171
2083-5892

Pojawia się w:

Discussiones Mathematicae Graph Theory

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 34.

Tytuł:

Graphs with Unique Maximum Packing of Closed Neighborhoods

Autorzy:

Božović, Dragana
Peterin, Iztok

Powiązania:

https://bibliotekanauki.pl/articles/32304193.pdf

Data publikacji:

2022-08-01

Wydawca:

Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii

Tematy:

unique maximum packing
closed neighborhoods
trees

Opis:

A packing of a graph G is a subset P of the vertex set of G such that the closed neighborhoods of any two distinct vertices of P do not intersect. We study graphs with a unique packing of the maximum cardinality. We present several general properties for such graphs. These properties are used to characterize the trees with a unique maximum packing. Two characterizations are presented where one of them is inductive based on five operations.

Źródło:

Discussiones Mathematicae Graph Theory; 2022, 42, 3; 779-797
2083-5892

Pojawia się w:

Discussiones Mathematicae Graph Theory

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 35.

Tytuł:

Badanie wzorców zachowań zdrowotnych z wykorzystaniem metod grupowania zmiennych
Examining patterns of health behaviours with using methods of grouping of variables

Autorzy:

Szołtysek, Jacek
Nowak, Bartosz

Powiązania:

https://bibliotekanauki.pl/articles/589379.pdf

Data publikacji:

2016

Wydawca:

Uniwersytet Ekonomiczny w Katowicach

Tematy:

Antykoncepcja hormonalna
Drzewa klasyfikacyjne
Drzewa regresyjne
Grupowanie zmiennych
Classification trees
Hormone contraceptive
Regressive trees
Sorting variables

Opis:

Podjęciu decyzji o rozpoczęciu antykoncepcji, towarzyszy z jednej strony impuls do takiego działania, a z drugiej – cechy osobowościowe, czyli wiek, miejsce zamieszkania, wiedza, doświadczenie, przekonania, edukacja. To one przekładają się na sumaryczne poglądy, którym często towarzyszą inne emocje, np. strach czy obawy. Taki model nazywany jest modelem zachowań zdrowotnych. Pojawienie się nowych okoliczności, takich jak skutki uboczne może poprzez zmianę poglądów zmodyfikować zachowanie zdrowotne. Kobiety stosujące antykoncepcję hormonalną doustną pod wpływem wystąpienia niepożądanych skutków ubocznych u siebie lub w otoczeniu, zmieniają swoje zachowania antykoncepcyjne. Badaniu ankietowemu poddano dwie grupy – 164 studentki z uczelni niemedycznych w celu ustalenia modeli zachowań zdrowotnych w obu grupach i dla porównania poglądów oraz zachowań – 74 studentki studiów medycznych.
For making a decision to begin the contraception, from one side impulse to such action is accompanying, on the other – personality features – age, domicile, knowledge, experience, beliefs, education, they are transferring themselves into summary views, which other emotions often accompany, e.g. one is afraid or anxieties. Such a model is called the model of health behaviors. Appearance of new circumstances, so as side effects can through a change in his views modify the health behavior. Women taking the oral hormone contraceptive under the influence of the appearance of undesirable side effects at oneself or in surroundings, are changing their contraceptive behaviors. Two groups were subjected to the questionnaire survey – 164 students from nonmedical colleges in the destination of establishing models of health behaviors in both groups and for comparison of views and behaviors 74 students of pharmacy.

Źródło:

Studia Ekonomiczne; 2016, 288; 88-107
2083-8611

Pojawia się w:

Studia Ekonomiczne

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 36.

Tytuł:

Training indicators as predictors of the sport performance of the race walker Matej Tóth in YTC 2013/2014 to YTC 2015/2016

Autorzy:

Brodani, Jaroslav
Toth, Matej
Spisiak, Matej
Siska, Luboslav

Powiązania:

https://bibliotekanauki.pl/articles/1923597.pdf

Data publikacji:

2018-09-05

Wydawca:

PPHU Projack Jacek Wąsik

Tematy:

athletics
racewalk
training indicators
performance
regression trees

Opis:

Introduction: This paper shows the impact of effect of the training indicators to the sport performance of the Olympic and world champion in the men's 50-kilometer race-walk Matej Tóth in year training cycles YTC - year training cycles 2013/2014 to YTC 2015/2016. Method: The basis of the analysis were the training volume indicators and the annual sport performance. Nonparametric procedures were chosen according to the assessment of the normality of file layout. Differences between the completed volume were evaluated statistically (Z) and substantively (“r”). The nonparametric algorithm CART was used for the construction of the regression trees. Result: By the CART method were selected training indicators which showed in the individual YTC high tightness with racewalking performance. In the YTC 2013/2014 (50 km 3:36:21 h; 20 km: 1:19:48 h) indicators of tempo endurance, special intensive and extensive tempo endurance has enforced in the model. Peak of the YTC 2014/2015 (50 km 3:34:38 hod; 20 km 1:20:21 hod) were the World Championships in Beijing. Intense special endurance, intense aerobic endurance and extensive tempo endurance have been enforced between the predictors of the walking performance. The training loss in the Olympic YTC 2015/2016 (50km 3:40:58h) had caused the reduced volume of the total load and walk training indicators. The reduced volume was compensated by increased volume of the cross-country skiing, training adds and by the walking at an extensive aerobic rate. This fact was reflected in the low number of regression tree factors. Number of training units and extensive special endurance came to the fore for the 50 km performance. Conclusion: In all YTC the impact of special endurance on sport performance has been proved. The specific periodization YTC showed cumulative effect of rate and aerobic endurance or training units.

Źródło:

Physical Activity Review; 2018, 6; 161-170
2300-5076

Pojawia się w:

Physical Activity Review

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 37.

Tytuł:

Arboreal Tradition and Subversion: An Ecocritical Reading of Shakespeare’s Portrayal of Trees, Woods and Forests

Autorzy:

Cossio, Andoni
Simonson, Martin

Powiązania:

https://bibliotekanauki.pl/articles/1033503.pdf

Data publikacji:

2020-06-30

Wydawca:

Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego

Tematy:

Shakespeare
trees
woods
forests
ecocriticism
tradition
subversion

Opis:

This paper analyses from an ecocritical standpoint the role of trees, woods and forests and their symbolism in William Shakespeare’s Hamlet, Macbeth, The Merchant of Venice, The Merry Wives of Windsor, A Midsummer Night’s Dream, Richard II and The Tempest. The analysis begins with an outline of the representation of trees on stage to continue with a ‘close reading’ of the mentioned plays, clearly distinguishing individual trees from woods and forests. Individual types of trees may represent death, sadness, sorcery and premonitions, or serve as meeting places, while forests and woods are frequently portrayed as settings which create an atmosphere of confusion, false appearances, danger and magic. This reflects a long-standing historical connection between trees and forests and the supernatural in literature and culture. However, while individual trees largely reflect traditional symbology, conventional interpretations are often subverted in Shakespeare’s treatment of forests and woods. From all this we may infer that Shakespeare was not only familiar with the traditions associated to individual tree species and forests in general, but also that he made conscious and active use of these in order to enhance the meaning of an action, reinforce character traits, further the plot and create a specific atmosphere. More subtly, the collective arboreal environments can also be interpreted as spaces in which superstitions and older societal models are questioned in favour of a more rational and reasonable understanding of the world.

Źródło:

Multicultural Shakespeare: Translation, Appropriation and Performance; 2020, 21, 36; 85-97
2083-8530
2300-7605

Pojawia się w:

Multicultural Shakespeare: Translation, Appropriation and Performance

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 38.

Tytuł:

Diversity, distribution and threats of the Juglandaceae in Vietnam

Autorzy:

Van Sam, H.
Quang Tung, D.
Jasinska, A.K.
Rion, F.
Tuyen, P.T.
Ngoc, D.T.B.
Tam, D.T.
Bétrisey, S.
Song, Y.G.
Kozlowski, G.

Powiązania:

https://bibliotekanauki.pl/articles/2078269.pdf

Data publikacji:

2021

Wydawca:

Polska Akademia Nauk. Instytut Dendrologii PAN

Tematy:

Conservation biology
relict trees
Rhoiptelea
Engelhardia
Alfaropsis

Opis:

Vietnam is one of the main centers of generic diversity for Juglandaceae worldwide. In this study, we present for the first time a province-wide distribution of all 3 subfamilies, 7 genera, and 11 Vietnamese species, and give an update on the habitats of all Vietnamese Juglandaceae species, their uses, and current threats. Juglandaceae are found throughout Vietnam. However, most species occur predominantly in the north- ern part of the country between 600 and 1200 m. Some taxa range is found extensively from sea level up to 2,500 meters above sea level. According to the IUCN Red List, Rhoiptelea chiliantha, Carya sinensis, and Pterocarya tonkinensis are threatened while Engelhardia spicata, E. serrata, Alfaropsis roxburghiana, Pterocarya stenoptera are classified as least concerned (Carya tonkinensis is threatened locally, and Engelhardia spicata var. colebrookiana and Platycarya strobilacea merit “threatened” designation in Vietnam’s Red Data Book. The most frequent threats are logging, land-use change, and habitat destruction due to artificial wood planta- tions or road construction. Until now, no conservation measures have been applied for any of the species in Vietnam, although some species occur in national parks. Our study gives an important update on the current diversity and distribution of Juglandaceae in Vietnam. We point out the need for a correct assessment of the threat status of various species on a national and international scale to protect the rarest and most endangered of them. Further research, the use of various forms of protection of individual taxa and/or their habitats, and drawing the attention of an international group of researchers to the urgent need to work together to protect biodiversity in Vietnam hot spots are necessary.

Źródło:

Dendrobiology; 2021, 86; 39-55
1641-1307

Pojawia się w:

Dendrobiology

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 39.

Tytuł:

Scattered context grammars generating sentences followed by derivation tree

Autorzy:

Meduna, A.
Židek, S.

Powiązania:

https://bibliotekanauki.pl/articles/375701.pdf

Data publikacji:

2011

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

parallel grammars
scattered context grammars
derivation trees

Opis:

Propagating scattered context grammars are used to generate sentences of languages defined by scatterd context grammars followed by the strings corresponding to the derivation trees. It is proved that for every language defined by a scattered context grammar, there exists a propagating scattered context grammar whose language consists of original language sentences followed by strings representing their derivation trees.

Źródło:

Theoretical and Applied Informatics; 2011, 23, 2; 97-106
1896-5334

Pojawia się w:

Theoretical and Applied Informatics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 40.

Tytuł:

On the global offensive alliance number of a tree

Autorzy:

Bouzefrane, M.
Chellali, M.

Powiązania:

https://bibliotekanauki.pl/articles/255263.pdf

Data publikacji:

2009

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH

Tematy:

global offensive alliance number
domination number
trees

Opis:

For a graph G = (V, E), a set S ⊆ V is a dominating set if every vertex in V - S has at least a neighbor in S. A dominating set S is a global offensive alliance if for every vertex v in V - S, at least half of the vertices in its closed neighborhood are in S. The domination number ϒ(G) is the minimum cardinality of a dominating set of G and the global offensive alliance number ϒo(G) is the minimum cardinality of a global offensive alliance of G. We first show that every tree of order at least three with l leaves and s support vertices satisfies ϒo(T) ≥ (n - l + s + 1)/3 and we characterize extremal trees attaining this lower bound. Then we give a constructive characterization of trees with equal domination and global offensive alliance numbers.

Źródło:

Opuscula Mathematica; 2009, 29, 3; 223-228
1232-9274
2300-6919

Pojawia się w:

Opuscula Mathematica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 41.

Tytuł:

On expansive and anti-expansive tree maps

Autorzy:

Kozerenko, S,

Powiązania:

https://bibliotekanauki.pl/articles/255446.pdf

Data publikacji:

2018

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH

Tematy:

maps on trees
Markov graphs
Sharkovsky's theorem

Opis:

With every self-map on the vertex set of a finite tree one can associate the directed graph of a special type which is called the Markov graph. Expansive and anti-expansive tree maps are two extremal classes of maps with respect to the number of loops in their Markov graphs. In this paper we prove that a tree with at least two vertices has a perfect matching if and only if it admits an expansive cyclic permutation of its vertices. Also, we show that for every tree with at least three vertices there exists an expansive map with a weakly connected (strongly connected provided the tree has a perfect matching) Markov graph as well as anti-expansive map with a strongly connected Markov graph.

Źródło:

Opuscula Mathematica; 2018, 38, 3; 379-393
1232-9274
2300-6919

Pojawia się w:

Opuscula Mathematica

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 42.

Tytuł:

Note about sequences of extrema \((A,2B)\)-edge coloured trees

Autorzy:

Bednarz, Urszula
Włoch, Iwona

Powiązania:

https://bibliotekanauki.pl/articles/747039.pdf

Data publikacji:

2017

Wydawca:

Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej

Tematy:

Edge colouring
trees
Fibonacci numbers
telephone numbers

Opis:

In this paper we determine successive extremal trees with respect to the number of all \((A,2B)\)-edge colourings.

Źródło:

Annales Universitatis Mariae Curie-Skłodowska, sectio A – Mathematica; 2017, 71, 2
0365-1029
2083-7402

Pojawia się w:

Annales Universitatis Mariae Curie-Skłodowska, sectio A – Mathematica

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 43.

Tytuł:

On locating and differentiating-total domination in trees

Autorzy:

Chellali, Mustapha

Powiązania:

https://bibliotekanauki.pl/articles/743043.pdf

Data publikacji:

2008

Wydawca:

Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii

Tematy:

locating-total domination
differentiating-total domination
trees

Opis:

A total dominating set of a graph G = (V,E) with no isolated vertex is a set S ⊆ V such that every vertex is adjacent to a vertex in S. A total dominating set S of a graph G is a locating-total dominating set if for every pair of distinct vertices u and v in V-S, N(u)∩S ≠ N(v)∩S, and S is a differentiating-total dominating set if for every pair of distinct vertices u and v in V, N[u]∩S ≠ N[v] ∩S. Let $γₜ^L(G)$ and $γₜ^D(G)$ be the minimum cardinality of a locating-total dominating set and a differentiating-total dominating set of G, respectively. We show that for a nontrivial tree T of order n, with l leaves and s support vertices, $γₜ^L(T) ≥ max{2(n+l-s+1)/5,(n+2-s)/2}$, and for a tree of order n ≥ 3, $γₜ^D(T) ≥ 3(n+l-s+1)/7$, improving the lower bounds of Haynes, Henning and Howard. Moreover we characterize the trees satisfying $γₜ^L(T) = 2(n+l- s+1)/5$ or $γₜ^D(T) = 3(n+l-s+1)/7$.

Źródło:

Discussiones Mathematicae Graph Theory; 2008, 28, 3; 383-392
2083-5892

Pojawia się w:

Discussiones Mathematicae Graph Theory

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 44.

Tytuł:

Trees with equal 2-domination and 2-independence numbers

Autorzy:

Chellali, Mustapha
Meddah, Nacéra

Powiązania:

https://bibliotekanauki.pl/articles/743338.pdf

Data publikacji:

2012

Wydawca:

Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii

Tematy:

2-domination number
2-independence number
trees

Opis:

Let G = (V,E) be a graph. A subset S of V is a 2-dominating set if every vertex of V-S is dominated at least 2 times, and S is a 2-independent set of G if every vertex of S has at most one neighbor in S. The minimum cardinality of a 2-dominating set a of G is the 2-domination number γ₂(G) and the maximum cardinality of a 2-independent set of G is the 2-independence number β₂(G). Fink and Jacobson proved that γ₂(G) ≤ β₂(G) for every graph G. In this paper we provide a constructive characterization of trees with equal 2-domination and 2-independence numbers.

Źródło:

Discussiones Mathematicae Graph Theory; 2012, 32, 2; 263-270
2083-5892

Pojawia się w:

Discussiones Mathematicae Graph Theory

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 45.

Tytuł:

Dendroflora parku pałacowego w Unii (województwo wielkopolskie)

Autorzy:

Antkowiak, W.
Czekalski, M.

Powiązania:

https://bibliotekanauki.pl/articles/2118627.pdf

Data publikacji:

2020

Wydawca:

Uniwersytet Przyrodniczy w Poznaniu

Tematy:

palace landscapepark
trees and shrubs
Unia
Wielkopolska

Opis:

The park at Unia was established on the turm of the 19th century. It is 6.0 ha, with 42 species and cultivars trees and shrubs. Especially noteworthy are English oak (Quercus robur) 460 cm circumfer- ence, broad-leaved linden (Tilia platyphyllos) 420 cm circumference, little-leaf linden (Tilia cordata) 363 cm, European ash (Fraxinus excelsior) 360 cm, Russian elm (Ulmus laevis) 342 cm, crack willow (Salix fragilis) 340 cm, European alder (Alnus glutinosa) 366 cm, black poplar ‘Italica’ (Populus nigra ‘Italica’) 325 cm, box elder (Acer negundo) 255 cm, several common horse chestnut (Aesculus hippocastanum), black locust (Robinia pseudoacacia), and another trees and shrubs.

Źródło:

Steciana; 2020, 24, 3; 21-33
1689-653X

Pojawia się w:

Steciana

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 46.

Tytuł:

Asteroidal Quadruples in non Rooted Path Graphs

Autorzy:

Gutierrez, Marisa
Lévêque, Benjamin
Tondato, Silvia B.

Powiązania:

https://bibliotekanauki.pl/articles/31339314.pdf

Data publikacji:

2015-11-01

Wydawca:

Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii

Tematy:

clique trees
rooted path graphs
asteroidal quadruples

Opis:

A directed path graph is the intersection graph of a family of directed subpaths of a directed tree. A rooted path graph is the intersection graph of a family of directed subpaths of a rooted tree. Rooted path graphs are directed path graphs. Several characterizations are known for directed path graphs: one by forbidden induced subgraphs and one by forbidden asteroids. It is an open problem to find such characterizations for rooted path graphs. For this purpose, we are studying in this paper directed path graphs that are non rooted path graphs. We prove that such graphs always contain an asteroidal quadruple.

Źródło:

Discussiones Mathematicae Graph Theory; 2015, 35, 4; 603-614
2083-5892

Pojawia się w:

Discussiones Mathematicae Graph Theory

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 47.

Tytuł:

Endofity bakteryjne drzew leśnych - stan wiedzy i sposoby wykorzystania
Endophytic bacteria of the forest trees - state of the art and possible applications

Autorzy:

Siebyła, M.
Szyp-Borowska, I.

Powiązania:

https://bibliotekanauki.pl/articles/979123.pdf

Data publikacji:

2020

Wydawca:

Polskie Towarzystwo Leśne

Tematy:

endophytic bacteria
forest trees
host plant
symbiosis

Opis:

The interaction of endophytic microorganisms with plants are a common occurrence that brings mutual benefits to partners. Plants are the main habitat of bacteria that live inside their tissues and do not cause disease symptoms, but affect the growth and development of plants by producing substances that promote their development. Research on the diversity of endophytic bacteria associated with forest trees is insufficient – little is known about the diversity of endophytic bacteria, and especially their function in tree tissues. Bacteria positively affecting the host tree, among others, increase biomass growth by supporting tree health. The species diversity of endophytic bacteria in plants is influenced by the plant genotype, tissue type, development phase and environmental conditions. So far, bacteria that develop in root, stem, and leaf tissues have been best known. Among the forest trees in which the occurrence and diversity of endophytic bacteria have been studied, there are species such as pine, spruce, birch and oak. The presented paper is a review of the latest literature on the subject.

Źródło:

Sylwan; 2020, 164, 06; 497-504
0039-7660

Pojawia się w:

Sylwan

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 48.

Tytuł:

Harmonic functions and Hardy spaces on trees with boundaries

Autorzy:

Pytlik, Tadeusz

Powiązania:

https://bibliotekanauki.pl/articles/967641.pdf

Data publikacji:

1992

Wydawca:

Polska Akademia Nauk. Instytut Matematyczny PAN

Tematy:

trees
Hardy spaces
random walks
harmonic functions

Źródło:

Colloquium Mathematicum; 1992, 63, 2; 263-272
0010-1354

Pojawia się w:

Colloquium Mathematicum

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 49.

Tytuł:

Informational database on selected music works

Autorzy:

Hippe, M. P.

Powiązania:

https://bibliotekanauki.pl/articles/1941711.pdf

Data publikacji:

2000

Wydawca:

Politechnika Gdańska

Tematy:

attribute of music
decision trees
inference rules

Opis:

Basing on the review of available literature devoted to applications of programming tools in research on mechanism of music perception, the first results of my own research devoted to mining of hidden regularities in pieces of various types of music is presented. General characteristics of the developed databases, methodology of executed research, and discussion of the discovered knowledge structures for selected types of music pieces are briefly dealt with.

Źródło:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2000, 4, 1; 83-90
1428-6394

Pojawia się w:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 50.

Tytuł:

Dendroflora parku pałacowego w Uzarzewie (województwo wielkopolskie)
Dendroflora of the palace park in Uzarzewo (greater poland voivodeship)

Autorzy:

Antkowiak, W.
Czekalski, M.

Powiązania:

https://bibliotekanauki.pl/articles/2118657.pdf

Data publikacji:

2019

Wydawca:

Uniwersytet Przyrodniczy w Poznaniu

Tematy:

palace landscapepark
trees and shrubs
Uzarzewo
Wielkopolska

Opis:

The park at Uzarzewo was established in the early 20th century. It is 6.1 ha, with 71 species and cultivars trees and shrubs. Especially noteworthy are European beach (Fagus sylvatica ‘Purpurea’) 355 cm circumference, London plane (Platanus ×hispanica ‘Acerifolia’) 560 and 456 cm circumference, several chest- nut trees (Aesculus hippocastanum), black locust (Robinia pseudoacacia) and European ash (Fraxinus excelsior), many trees of hedge maple (Acer campestre), and another trees and shrubs.

Źródło:

Steciana; 2019, 23, 1; 3-17
1689-653X

Pojawia się w:

Steciana

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 51.

Tytuł:

ASA-graphs for efficient data representation and processing

Autorzy:

Horzyk, Adrian
Bulanda, Daniel
Starzyk, Janusz A.

Powiązania:

https://bibliotekanauki.pl/articles/1838165.pdf

Data publikacji:

2020

Wydawca:

Uniwersytet Zielonogórski. Oficyna Wydawnicza

Tematy:

self balancing trees
self sorting trees
self aggregating data structures
associative structures
data access efficiency
representation of relationships

Opis:

Fast discovering of various relationships in data is an important feature of modern data mining, cognitive, knowledge-based, and explainable AI systems, including deep neural networks. The ability to represent a rich set of relationships between stored data and objects is essential for fast inferences, finding associations, representing knowledge, and extracting useful patterns or other pieces of information. This paper introduces self-balancing, aggregating, and sorting ASA-graphs for efficient data representation in various data structures, databases, and data mining systems. These graphs are smaller and use more efficient algorithms for searching, inserting, and removing data than the most commonly used self-balancing trees. ASA-graphs also automatically aggregate and count all duplicates of values and represent them by the same nodes, connecting them in order, and simultaneously providing very fast data access based on a binary search tree approach. The proposed ASA-graph structure combines the advantages of sorted lists, binary search trees, B-trees, and B+trees, eliminating their weaknesses. Our experiments proved that the ASA-graphs outperform many commonly used self-balancing trees.

Źródło:

International Journal of Applied Mathematics and Computer Science; 2020, 30, 4; 717-731
1641-876X
2083-8492

Pojawia się w:

International Journal of Applied Mathematics and Computer Science

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 52.

Tytuł:

Strong Equality Between the Roman Domination and Independent Roman Domination Numbers in Trees

Autorzy:

Chellali, Mustapha
Rad, Nader Jafari

Powiązania:

https://bibliotekanauki.pl/articles/30146596.pdf

Data publikacji:

2013-05-01

Wydawca:

Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii

Tematy:

Roman domination
independent Roman domination
strong equality
trees

Opis:

A Roman dominating function (RDF) on a graph $G = (V,E)$ is a function $ f : V \rightarrow {0, 1, 2} $ satisfying the condition that every vertex $ u $ for which $ f(u) = 0 $ is adjacent to at least one vertex $v$ for which $f(v) = 2$. The weight of an RDF is the value $ f(V (G)) = \Sigma_{u \in V (G) } f(u) $. An RDF $f$ in a graph $G$ is independent if no two vertices assigned positive values are adjacent. The Roman domination number $ \gamma_R (G) $ (respectively, the independent Roman domination number $ i_R(G) $) is the minimum weight of an RDF (respectively, independent RDF) on $G$. We say that $ \gamma_R(G)$ strongly equals $ i_R(G)$, denoted by $ \gamma_R (G) \equiv i_R(G)$, if every RDF on $G$ of minimum weight is independent. In this paper we provide a constructive characterization of trees $T$ with $ \gamma_R(T) \equiv i_R(T) $.

Źródło:

Discussiones Mathematicae Graph Theory; 2013, 33, 2; 337-346
2083-5892

Pojawia się w:

Discussiones Mathematicae Graph Theory

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 53.

Tytuł:

Polish tagger TaKIPI: rule based construction and optimization

Autorzy:

Piasecki, M.

Powiązania:

https://bibliotekanauki.pl/articles/1943261.pdf

Data publikacji:

2007

Wydawca:

Politechnika Gdańska

Tematy:

morphosyntactic tagging
Polish
rule based tagging
decizion trees

Opis:

A large number of different tags, limited corpora and the free word order are the main causes of low accuracy of tagging in Polish (automatic disambiguation of morphological descriptions) by applying commonly used techniques based on stochastic modeling. In the paper the rule-based architecture of the TaKIPI Polish tagger combining handwritten and automatically extracted rules is presented. The possibilities of optimization of its parameters and component are discussed, including the possibility of using different methods of rules extraction, than C4.5 Decision Trees applied initially. The main goal of this paper is to explore a range of promising rule-based classifiers and investigate their impact on the accuracy of tagging. Simple techniques of combing classifiers are also tested. The performed experiments have shown that even a simple combination of different classifiers can increase the tagger's accuracy by almost one percent.

Źródło:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2007, 11, 1-2; 151-167
1428-6394

Pojawia się w:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 54.

Tytuł:

The POSITIVE SILENCE TO THE REMOVAL OF TREES – AN ANALYSIS OF A LEGAL INSTITUTION
POSITIVE SILENCE TO THE REMOVAL OF TREES – AN ANALYSIS OF A LEGAL INSTITUTION

Autorzy:

Haładyj, Anna
Kułak-Krzysiak, Katarzyna

Powiązania:

https://bibliotekanauki.pl/articles/784258.pdf

Data publikacji:

2019

Wydawca:

Katolicki Uniwersytet Lubelski Jana Pawła II

Tematy:

Removal of trees, Positive silence, Administrative silence, Notification

Opis:

The authorisation for removing trees constituting a common nature protection instrument was supplemented in 2017 by the obligation to notify the intention to remove trees. The right to notify and object to the intention of tree removal corresponds conceptually to the model of positive silence provided for in the amended Code of Administrative Procedure as one of the ways of administrative silence. Our objective is to analyse procedural solutions and the substantive institution of environmental protection law which consists in a notification from the point of view of assessing the correctness of its application when considering law science and administrative proceedings

Źródło:

Review of European and Comparative Law; 2019, 36, 1; 7-26
2545-384X

Pojawia się w:

Review of European and Comparative Law

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 55.

Tytuł:

Dynamics on Hubbard trees

Autorzy:

Alsedà, Lluís
Fagella, Núria

Powiązania:

https://bibliotekanauki.pl/articles/1205063.pdf

Data publikacji:

2000

Wydawca:

Polska Akademia Nauk. Instytut Matematyczny PAN

Tematy:

Hubbard trees
renormalization
Misiurewicz polynomials
transitivity
topological entropy

Opis:

It is well known that the Hubbard tree of a postcritically finite complex polynomial contains all the combinatorial information on the polynomial. In fact, an abstract Hubbard tree as defined in [23] uniquely determines the polynomial up to affine conjugation. In this paper we give necessary and sufficient conditions enabling one to deduce directly from the restriction of a quadratic Misiurewicz polynomial to its Hubbard tree whether the polynomial is renormalizable, and in this case, of which type. Moreover, we study dynamical features such as entropy, transitivity or periodic structure of the polynomial restricted to the Hubbard tree, and compare them with the properties of the polynomial on its Julia set. In other words, we want to study how much of the "dynamical information" about the polynomial is captured by the Hubbard tree.

Źródło:

Fundamenta Mathematicae; 2000, 164, 2; 115-141
0016-2736

Pojawia się w:

Fundamenta Mathematicae

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 56.

Tytuł:

Uplift Modeling in Direct Marketing

Autorzy:

Rzepakowski, P.
Jaroszewicz, S.

Powiązania:

https://bibliotekanauki.pl/articles/309211.pdf

Data publikacji:

2012

Wydawca:

Instytut Łączności - Państwowy Instytut Badawczy

Tematy:

decision trees
information theory
marketing tools
uplift modeling

Opis:

Marketing campaigns directed to randomly selected customers often generate huge costs and a weak response. Moreover, such campaigns tend to unnecessarily annoy customers and make them less likely to answer to future communications. Precise targeting of marketing actions can potentially results in a greater return on investment. Usually, response models are used to select good targets. They aim at achieving high prediction accuracy for the probability of purchase based on a sample of customers, to whom a pilot campaign has been sent. However, to separate the impact of the action from other stimuli and spontaneous purchases we should model not the response probabilities themselves, but instead, the change in those probabilities caused by the action. The problem of predicting this change is known as uplift modeling, differential response analysis, or true lift modeling. In this work, tree-based classifiers designed for uplift modeling are applied to real marketing data and compared with traditional response models, and other uplift modeling techniques described in literature. The experiments show that the proposed approaches outperform existing uplift modeling algorithms and demonstrate significant advantages of uplift modeling over traditional, response based targeting.

Źródło:

Journal of Telecommunications and Information Technology; 2012, 2; 43-50
1509-4553
1899-8852

Pojawia się w:

Journal of Telecommunications and Information Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 57.

Tytuł:

Taxonomic relationships and population differentiation of the south-western Eurasian Zelkova species inferred in leaf morphology

Autorzy:

Jasinska, A.K.
Rucinska, B.
Kozlowski, G.
Fazan, L.
Garfi, G.
Pasta, S.
Bétrisey, S.
Gerber, E.
Boratynska, K.
Boratynski, A.

Powiązania:

https://bibliotekanauki.pl/articles/2078267.pdf

Data publikacji:

2021

Wydawca:

Polska Akademia Nauk. Instytut Dendrologii PAN

Tematy:

biogeography
plant variation
relict trees
systematics
taxonomy
Ulmaceae

Opis:

The relict tree species Zelkova abelicea and Z. sicula (Ulmaceae) occur in Crete and Sicily, respec- tively. Zelkova abelicea grows in approximately 40 localities in the mountains of Crete, while Z. sicula has been found in only two stands in Sicily. We compared 25 morphological characters of the leaves of both species and used statistical methods (Tuk- ey’s test, discrimination analysis, principal component analysis, agglomeration) to reveal the differences between these two species, their relation to Z. carpinifolia (the third Zelkova south-west Eurasian species), and between the leaves from different shoot types. Our study represents the first comparative biometric analysis of the three Zelkova species localized in the western edge of the current geographic range of the genus. We found that the species differed from each other both, in terms of leaf form characters and level of leaf variation. Zelkova carpinifolia was clearly differ- ent from Z. abelicea, while the two populations of Z. sicula, SIB and SIA, were more similar to Z. carpinifolia and Z. abelicea, respectively. The latter finding supports the results of recent molecular studies suggesting the hybrid origin of Z. sicula. Zelkova abelicea, Z. sicula and Z. carpinifolia differ each other in the leaf characteristics and level of phenotypic variation.

Źródło:

Dendrobiology; 2021, 85; 60-77
1641-1307

Pojawia się w:

Dendrobiology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 58.

Tytuł:

Global offensive k-alliance in bipartite graphs

Autorzy:

Chellali, M.
Volkmann, L.

Powiązania:

https://bibliotekanauki.pl/articles/255370.pdf

Data publikacji:

2012

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH

Tematy:

global offensive k-alliance number
bipartite graphs
trees

Opis:

Let k ≥ 0 be an integer. A set S of vertices of a graph G = (V (G), E(G)) is called a global offensive k-alliance if /N(v) ∩ S/ ≥ /N(v) - S/ + k for every v ∈ V (G) - S, where 0 ≤ k Δ and Δ is the maximum degree of G. The global offensive k-alliance number [formula] is the minimum cardinality of a global offensive k-alliance in G. We show that for every bipartite graph G and every integer k ≥ 2, [formula], where Lk(G) is the set of vertices of degree at most k - 1. Moreover, extremal trees attaining this upper bound are characterized.

Źródło:

Opuscula Mathematica; 2012, 32, 1; 83-89
1232-9274
2300-6919

Pojawia się w:

Opuscula Mathematica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 59.

Tytuł:

Trees as Dialogue: Negotiating Boundaries with the Anne Frank Sapling Project

Autorzy:

Čapek, Stella M.

Powiązania:

https://bibliotekanauki.pl/articles/1024352.pdf

Data publikacji:

2020-08-07

Wydawca:

Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego

Tematy:

Truth-Spots
Trees
Social Justice
Museums
Anne Frank

Opis:

My qualitative research paper focuses on the Anne Frank sapling installation at the Clinton Presidential Museum and Library in Little Rock, Arkansas. Saplings grafted from the tree that grew outside Anne Frank’s window in Amsterdam while she wrote her famous diary are provided by the Anne Frank Center for Mutual Respect to organizations that will link the tree to dialogues about past and present social justice issues. Building on Thomas Gieryn’s recent work on “truth-spots,” I explore the sapling installation as a possible “truth-spot,” and reflect on what kind of truth is supported there. From a symbolic interactionist perspective, I consider the sapling as a boundary-crossing entity that, together with other elements of the installation, stimulates reflection and inclusive dialogue, and fosters hope without shunning complexity. I discuss the sapling’s ecological needs and material agency, since it is not a passive recipient of human meanings and orchestrations. I also comment on the changing role of museum installations and exhibit space in the context of social justice.

Źródło:

Qualitative Sociology Review; 2020, 16, 3; 28-47
1733-8077

Pojawia się w:

Qualitative Sociology Review

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 60.

Tytuł:

A dynamic MST-deltaCoVaR model of systemic risk in the European insurance sector

Autorzy:

Denkowska, Anna
Wanat, Stanisław

Powiązania:

https://bibliotekanauki.pl/articles/1054560.pdf

Data publikacji:

2021-06-04

Wydawca:

Główny Urząd Statystyczny

Tematy:

systemic risk
minimum spanning trees
deltaCoVaR
insurance sector

Opis:

This work is a response to the EIOPA paper entitled 'Systemic risk and macroprudential policy in insurance', which asserts that in order to evaluate the potential systemic risk (SR), the build-up of risk, especially risk arising over time, should be taken into account, as well as the interlinkages occurring in the financial sector and the whole economy. The topological indices of minimum spanning trees (MST) and the deltaCoVaR measure are the main tools used to analyse the systemic risk dynamics in the European insurance sector in the years 2005-2019. The article analyses the contribution of each of the 28 largest European insurance companies, including those appearing on the G-SIIs list, to systemic risk. Moreover, the paper aims to determine whether the most important contribution to systemic risk is made by companies with the highest betweenness centrality or the highest degree in the obtained MST.

Źródło:

Statistics in Transition new series; 2021, 22, 2; 173-188
1234-7655

Pojawia się w:

Statistics in Transition new series

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 61.

Tytuł:

An overview of methods for tree geometric parameter estimation from ALS data in the context of their application for agricultural trees
Przegląd metod estymacji parametrów geometrycznych drzew z danych ALS w kontekście ich aplikacji dla drzew uprawnych

Autorzy:

Hadaś, E.

Powiązania:

https://bibliotekanauki.pl/articles/341462.pdf

Data publikacji:

2015

Wydawca:

Uniwersytet Przyrodniczy we Wrocławiu

Tematy:

ALS
trees
agriculture
remote sensing
drzewa
rolnictwo
teledetekcja

Opis:

The aim of this paper is to overview and analyse existing methods for estimation of tree geometric parameters from Airborne Laser Scanning (ALS) data in the context of their possible application for agricultural areas. A detailed description of the estimation methodology proposed by various research groups is presented, including Canopy Height Model creation, tree identification, crown delineation in 2D and 3D, estimation of tree height, crown base height, crown diameters and crown volume. Efficiency and drawbacks of presented methods are identified. It is also analysed, whether the existing methods, originally developed for forestry areas, are suitable for agricultural trees.
Celami pracy są przegląd oraz analiza istniejących metod estymacji parametrów geometrycznych drzew na podstawie danych lotniczego skaningu laserowego w kontekście ich aplikacji dla drzew uprawnych. W artykule przedstawiono szczegółowy opis metod estymacji tych parametrów stosowanych przez różne grupy badawcze. Opis uwzględnia budowę wysokościowego modelu koron, identyfikację drzew, identyfikację kształtu koron w 2D i 3D, estymację wysokości drzew, wysokości podstawy koron, średnic oraz objętości koron. Wskazano zalety i wady zaprezentowanych metod. Przeanalizowano także, czy opisane metody rozwinięte na obszarach leśnych mogą być wykorzystywane w przypadku drzew uprawnych.

Źródło:

Acta Scientiarum Polonorum. Geodesia et Descriptio Terrarum; 2015, 14, 3-4; 5-28
1644-0668

Pojawia się w:

Acta Scientiarum Polonorum. Geodesia et Descriptio Terrarum

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 62.

Tytuł:

Dendroflora parku pałacowego w Siedlcu (województwo wielkopolskie)
Dendroflora of the palace park in Siedlec (greater Poland voivodeship)

Autorzy:

Antkowiak, W.
Czekalski, M.

Powiązania:

https://bibliotekanauki.pl/articles/2130432.pdf

Data publikacji:

2018

Wydawca:

Uniwersytet Przyrodniczy w Poznaniu

Tematy:

palace landscape park
trees and shrubs
Siedlec
Wielkopolska

Opis:

The park at Siedlec was established in the early 20th century. It is 6.36 ha, with 85 species and cultivars trees and shrubs. Especially noteworthy are maidenhair tree (Ginkgo biloba) 287 cm circumference, many trees of hedge maple (Acer campestre), and another trees and shrubs.

Źródło:

Steciana; 2018, 22, 3; 57-68
1689-653X

Pojawia się w:

Steciana

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 63.

Tytuł:

Zastosowanie logicznych drzew decyzyjnych do analizy wad w etapie lutowania na fali podczas montażu SMT
Application of logical decision trees to analysis of defects at the stage of wave soldering during the SMT process

Autorzy:

Sadowińska, M.

Powiązania:

https://bibliotekanauki.pl/articles/340136.pdf

Data publikacji:

2014

Wydawca:

Polskie Towarzystwo Zarządzania Produkcją

Tematy:

proces SMT
lutowanie na fali
drzewo decyzyjne
logiczne drzewa decyzyjne
SMT process
wave soldering
decision trees
logical decision trees

Opis:

Decision trees are a logical method, which graphically presents the solution of logical function. They consist of the branch on which the data are coded variables. Solutions are presented as the true path. The method used to optimize the solution functions are logical decision trees, the construction of which the principle is the same as the logical trees. They make it possible to eliminate the occurrence of twigs isolated and cut off the full beam. This procedure allows to minimize the real twigs. This is advantageous due to the phenomenon that the optimal solution is the combination of variables, which is associated with the tree having the smallest number of real branches. This tree defines the status of the variables tested from most to least important. The purpose of the study was to determine the hierarchy of defects affecting the destabilization of one of the stages of the process SMT (surface mount), which is the wave soldering, and by this determine which should be eliminated in the first place. A tool that has been used for this purpose was a logical decision trees. According to the results of the analysis in the first place should prevent the causes of the formation of solder bridges (machine failure), then-without regard to the order-of overheating the PCB and too low solder temperature (the same effects on the occurrence of errors), which are the result of poor machine settings and the occurrence of machine failure. Thanks to the possibility of using minimization of logical variables (cutting off the full beam) in practical terms, the elimination of identified defects, it is necessary to determine the corrective action regarding the causes of defects, namely the lack of solder. This approach meant that the error should not be the subject of corrective action performed. The indicating reason was responsible only for the occurrence of the lack of solder. The using of logical decision trees could help identify priorities for improvements to the wave soldering realized as part of a process of SMT assembly.

Źródło:

Zarządzanie Przedsiębiorstwem; 2014, 17, 2; 26-33
1643-4773

Pojawia się w:

Zarządzanie Przedsiębiorstwem

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 64.

Tytuł:

Historyczne parki Londynu i Warszawy, konserwacja, utrzymanie drzew i drzewostanów na podstawie wybranych przykładów
Heritage parks of London and Warsaw, conservation, maintenance of trees and stands based on selected examples

Autorzy:

Boruch, Agnieszka
Borowski, Jacek

Powiązania:

https://bibliotekanauki.pl/articles/1196165.pdf

Data publikacji:

2021-04-27

Wydawca:

Polskie Towarzystwo Dendrologiczne

Tematy:

heritage park
park maintenance
comparison of parks
ancient trees
veteran trees
Kensington Park
Greenwich Park
Royal Łazienki Park
Wilanów Park

Opis:

The aim of the study was to develop proposals in order to improve the maintenance of selected heritage parks in Warsaw, with particular emphasis on trees and tree stands. Analyses leading to this, consist in showing the differences and similarities in the functioning and use of heritage parks in London and Warsaw. As a result of applying the adopted criteria, Kensington Park, Greenwich Park, Łazienki Królewskie and Ogród w Wilanowie were compared. Literature and field studies were carried out. The research was enriched with a survey on the evaluation of parks filled in by visitors. Based on the research, both parks were analysed in a descriptive form, supplemented with photographs, and the comparison between them. The greatest differences in the method of maintaining and managing both parks and their reasons were indicated. The differences in the species composition of trees were shown, incidental to including from historical and climatic conditions. It was found out that: in Warsaw there is no organisation associating with heritage parks, there are no long-term management plans. The process of issuing care decisions is complicated, what causes delays in their implementation, in Warsaw parks veteran trees are not isolated and they are not treated specially. External companies dealing with parks and tree stand conservation are employed one-off, which contributes to the lack of continuity and responsibility for the work performed. Proposed solutions may help to improve the management of Warsaw parks and contribute to the improvement of the condition of parks and their trees.

Źródło:

Rocznik Polskiego Towarzystwa Dendrologicznego; 2020, 68; 35-61
2080-4164
2300-8326

Pojawia się w:

Rocznik Polskiego Towarzystwa Dendrologicznego

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 65.

Tytuł:

Die Rechtsregelung von Straßenalleen vom 18. bis ins 21. Jahrhundert in böhmischen Ländern

Autorzy:

Salák, Pavel

Powiązania:

https://bibliotekanauki.pl/articles/621664.pdf

Data publikacji:

2012

Wydawca:

Uniwersytet w Białymstoku. Wydawnictwo Uniwersytetu w Białymstoku

Tematy:

alleys of trees, Habsburg monarchy, administration, Czech territories

Opis:

The temperate winter of 2006/2007 prompted the road maintenance board in some places within the Czech Republic to cut down the alleys of trees along the roads. These alleys started in 18th century, but were planted mostly in the first half of the 19th century, when the roads were built on a massive scale. Of course, together with the regulations of these roads, the planting of these alleys was also regulated by rules. Not only was the distance of the trees from the road regulated, but also the sort of trees that were planted, depending upon the climate conditions in the given locality. Because they shared the costs of planting, owners of the grounds preferred fruit trees. There were also penalties assessed for any damage done to the trees. To plant the alleys faster, school children were engaged in the growing of young trees. So from the 19th to the end of the 20th century, the alleys were a distinctive part of the Czech landscape. With the massive increase of traffic, alleys were increasingly threatened. First, the expansion of roads combined with increasing vehicle speed caused such alleys to become regarded as dangerous obstacles. Indeed, traffic safety was the main argument for the removal of trees along the roads. However, after the alleys began to be cut during the winter of 2006/2007, several weeks later the nature protection office and the traffic office stopped the cutting. Today, as well as in the past, the alleys have been important not only as a part of the landscape, but also for the traffic. Some studies from Austria can show, that cutting of alleys has led to an increase of the quantity of accidents caused by high speed – the drivers felt overconfident and thus and drove too fast.

Źródło:

Miscellanea Historico-Iuridica; 2012, 11; 191-203
1732-9132
2719-9991

Pojawia się w:

Miscellanea Historico-Iuridica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 66.

Tytuł:

The Use of Some Pattern Recognition Algorithms to Classify Patients Undergoing CABG
Zastosowanie wybranych algorytmów rozpoznawania obrazów do klasyfikacji pacjentów z chorobą wieńcową leczonych operacyjnie

Autorzy:

Misztal, Małgorzata

Powiązania:

https://bibliotekanauki.pl/articles/904928.pdf

Data publikacji:

2004

Wydawca:

Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego

Tematy:

pattern recognition algorithms
classification trees
coronary artery disease

Opis:

The primary goal of pattern recognition is supervised or unsupcrvised classification in order to solve decision - making problems. Medical diagnosis brings about many practical problems, which may be interpreted as pattern recognition tasks. Making diagnosis of a given patient means to solve a classification problem - we must recognize patient’s disease on the basis on some symptoms. The aim of the article is to present the results of using selected pattern recognition algorithms to classify patients with Coronary Artery Disease undergoing Coronary Artery Bypass Grafting (CABG).

Źródło:

Acta Universitatis Lodziensis. Folia Oeconomica; 2004, 175
0208-6018
2353-7663

Pojawia się w:

Acta Universitatis Lodziensis. Folia Oeconomica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 67.

Tytuł:

Unbiased Recursive Partitioning Algorithm in Regression Trees
Zastosowanie nieobciążonej metody rekurencyjnego podziału w metodzie drzew regresyjnych

Autorzy:

Rozmus, Dorota

Powiązania:

https://bibliotekanauki.pl/articles/906311.pdf

Data publikacji:

2009

Wydawca:

Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego

Tematy:

recursive partitioning
regression trees
aggregated models (ensembles)
prediction

Opis:

Drzewa klasyfikacyjne i regresyjne są bardzo popularnym narzędziem predykcji. Budowa takiego modelu polega na stopniowym podziale wielowymiarowej przestrzeni cech na rozłączne obszary aż do uzyskania maksymalnej ich homogeniczności ze względu na wartość zmiennej objaśnianej y. Podział ten kontynuowany jest w kolejnych krokach, w oparciu o wartości wybranych zmiennych objaśniających. Istnieje wiele możliwych sposobów wyboru tych zmiennych, a jednym z najpopularniejszych jest algorytm wyczerpującego przeszukiwania (ang. exhaustive search) opracowany przez Breimana (Breimana et al., 1984). Zaproponowany przez Hothoma, Hornika i Zeileisa, (2006) sposób doboru zmiennych znany pod nazwą nieobciążonej metody rekurencyjnego podziału (ang. unbiased recurcive partitioning) opierający się na zastosowaniu testów permutacyjnych miał na celu ominięcie podstawowej wady tradycyjnego podejścia, jakim jest tendencja do wyboru zmiennych dających wiele potencjalnych możliwości podziału. Okazuje się, że w przypadku dyskryminacji to nowatorskie podejście prowadzi do uzyskania modeli zapewniających bardzo zbliżone wyniki klasyfikacji jak podejście tradycyjne, a w podejściu wielomodelowym może doprowadzić do pogorszenia poprawności klasyfikacji. Zasadniczym celem referatu jest przedstawienie wyników badań, które mają na celu porównanie dokładności predykcji na podstawie drzew regresyjnych, które doboru zmiennych objaśniających dokonują za pomocą algorytmu wyczerpującego przeszukiwania oraz za pomocą podejścia bazującego na testach permutacyjnych. Ponadto porównane zostaną wyniki predykcji modeli zagregowanych, w których modelami składowymi będą te dwa rodzaje drzew regresyjnych.
Classification and regression trees are very popular tool for prediction. The construction of these models is based on recursive partitioning of multidimensional attribute space into disjoint homogenous regions till gaining the maximum homogeneity from the point of view of the dependent variable value. The main aim of this research is to apply in regression trees unbiased recursive partitioning algorithm proposed by Hothom, Homik and Zeileis (2006), which is based on permutation tests. The research takes into consideration both single and aggregated approach and compare the results with classical method of tree model construction based on exhaustive search algorithm proposed by Breiman et al. (1984).

Źródło:

Acta Universitatis Lodziensis. Folia Oeconomica; 2009, 228
0208-6018
2353-7663

Pojawia się w:

Acta Universitatis Lodziensis. Folia Oeconomica

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 68.

Tytuł:

The direct and indirect effect of fire on radial growth of Pinus koraiensis trees in a northern temperate forest of China

Autorzy:

Gao, Lushuang
Zhang, Chunyu
Zhao, Xiuhai
Zhang, Li

Powiązania:

https://bibliotekanauki.pl/articles/956863.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Instytut Dendrologii PAN

Tematy:

burned trees
growth pattern
competition
climate
korean pine

Opis:

The long-term effects of fire on the radial growth of Korean pines (Pinus koraiensis) in Changbai Mountain is poorly understood. In order to quantify the impact of fire on the radial growth of Korean pines, we measured ring widths and developed two tree-ring chronologies from 21 burned Korean pine trees that were damaged by fire in 1857 as well as 30 control trees in the Changbai Mountain Nature Reserve, China. As expected, the growth rates of the burned trees were slower than those of the control trees in the first five years following the fire. However, beginning six years after the fire, the growth of the burned trees increased considerably, and this period of increased growth lasted 13 years, with moderate growth occurring throughout the 1866 to 1871 period. A difference in growth rates between burned and control tress was also observed for the 20 years since temperatures began markedly increasing in 1980. Burned trees tended to respond negatively to monthly minimum temperature, precipitation, and vapor pressure deficits (VPD), whereas the positive relationship between those factors and radial growth of control trees became stronger. In addition, the significantly negative effect of competition on radial growth was only observed among burned trees. These results demonstrated that the negative and direct effect of damage to physiological plant processes by fire only affected the years shortly after a fire occurred and then became obscured by its indirect effects, such as differential responses to climate and competition, which did persist for a long time. The indirect effect on radial growth over time could be explained by the variability in the relative strength of climatic responses and competition caused by fire.

Źródło:

Dendrobiology; 2017, 78; 111-123
1641-1307

Pojawia się w:

Dendrobiology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 69.

Tytuł:

Predicting Basal Area Using Java Program in Akinyele Local Government Area, Ibadan, Oyo State, Nigeria

Autorzy:

Ureigho, U. N.
Osho, J. S. A.

Powiązania:

https://bibliotekanauki.pl/articles/1113848.pdf

Data publikacji:

2017

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

Basal area
Java program
maximum likelihood
prediction
trees

Opis:

Individual tree growth models are important decision-making tools in forestry. This study evaluated the predictive ability for basal area, of a Java program derived from the algorithm of gamma distribution function. The input value was diameter at breast height. In generating and testing the program, a stratified random sampling technique was used to select four different age classes of teak plantation, namely: 11, 13, 22 and 59 years-old, respectively. Complete enumeration of trees (n = 433) was done for all the plots selected. Diameter at breast height (DBH) was measured with the aid of diameter girth tape, which was also used for basal area computation. Data obtained were processed into tree and stand levels. Parameters α and β for Gamma Distribution function (GDF) were estimated from growth data. The java program was then written based on the algorithm of Gamma distribution function for α, β and n parameters. Values of diameter at breast height fitted into the Java program shows that it was able to predict the basal area. Therefore, the predictive ability of the developed Java Program for basal area of individual and full stand teak trees demonstrates that it can be used for prediction of yield in forest stands.

Źródło:

World News of Natural Sciences; 2017, 13; 122-129
2543-5426

Pojawia się w:

World News of Natural Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 70.

Tytuł:

Stan zachowania i dendroflora zabytkowego parku pałacowego w Batowie
The condition and dendroflora of the historic palace park in Batowo

Autorzy:

Urzykowski, Piotr
Kubus, Marcin

Powiązania:

https://bibliotekanauki.pl/articles/1186030.pdf

Data publikacji:

2020-02-19

Wydawca:

Polskie Towarzystwo Dendrologiczne

Tematy:

landscaped park
revaluation
trees and shrubs
northwestern Poland

Opis:

The aim of the study was to determine the condition of the nineteenth-century landscaped park of the palace in Batowo and to valorise its dendroflora. Lack of historical cartographic documentation makes it impossible to restore the original form and composition of the object. However, it is possible to revitalize the park, giving it new functions: active and passive recreation, for residents of the existing Nursing Home as well as an educational function for the inhabitants of the Lipiany commune. 79 taxa trees and shrubs grow in the Batowo park, including 9 gymnosperms and 70 angiosperms. The park’s old trees are preserved in generally good phytosanitary condition, however some trees require conservation and care. 52 specimens were qualified, due to the achieved dimensions, as monuments of nature. Among others the park boasts plants that are rarely found in Polish parks and gardens: Cedrus deodara, Quercus phellos, Q. ×schochiana, Q. imbricaria, Q. macrocarpa, Castanea sativa, Acer tegmentosum and Carya illinoinensis.

Źródło:

Rocznik Polskiego Towarzystwa Dendrologicznego; 2019, 67; 89-99
2080-4164
2300-8326

Pojawia się w:

Rocznik Polskiego Towarzystwa Dendrologicznego

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 71.

Tytuł:

On vertex b-critical trees

Autorzy:

Blidia, M.
Eschouf, N. I.
Maffray, F.

Powiązania:

https://bibliotekanauki.pl/articles/254799.pdf

Data publikacji:

2013

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH

Tematy:

b-coloring
b-critical graphs
b-critical trees

Opis:

A b-coloring is a proper coloring of the vertices of a graph such that each color class has a vertex that has neighbors of all other colors. The b-chromatic number of a graph G is the largest k such that G admits a b-coloring with k colors. A graph G is b-critical if the removal of any vertex of G decreases the b-chromatic number. We prove various properties of b-critical trees. In particular, we characterize b-critical trees.

Źródło:

Opuscula Mathematica; 2013, 33, 1; 19-28
1232-9274
2300-6919

Pojawia się w:

Opuscula Mathematica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 72.

Tytuł:

A note on global alliances in trees

Autorzy:

Bouzefrane, M.
Chellali, M.

Powiązania:

https://bibliotekanauki.pl/articles/254977.pdf

Data publikacji:

2011

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH

Tematy:

global defensive alliance
global offensive alliance
domination
trees

Opis:

For a graph G = (V,E), a set S ⊆ V is a dominating set if every vertex in V - S has at least a neighbor in S. A dominating set S is a global offensive (respectively, defensive) alliance if for each vertex in V - S (respectively, in S) at least half the vertices from the closed neighborhood of v are in S. The domination number γ (G) is the minimum cardinality of a dominating set of G, and the global offensive alliance number γo(G) (respectively, global defensive alliance number γa(G)) is the minimum cardinality of a global offensive alliance (respectively, global deffensive alliance) of G. We show that if T is a tree of order n, then γo(T) ≤ 2γ (T) - 1 and if n ≥ 3, then γo(T) ≤ 3/2?a(T) ? 1. Moreover, all extremal trees attaining the first bound are characterized.

Źródło:

Opuscula Mathematica; 2011, 31, 2; 153-159
1232-9274
2300-6919

Pojawia się w:

Opuscula Mathematica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 73.

Tytuł:

The impact of air pollution on growth features and the health of trees in Berlin

Autorzy:

Pietras-Couffignal, K.
Robakowski, P.

Powiązania:

https://bibliotekanauki.pl/articles/2077709.pdf

Data publikacji:

2019

Wydawca:

Polska Akademia Nauk. Instytut Dendrologii PAN

Tematy:

Acer
Aesculus
Tilia
Platanus
city trees
urban conditions

Opis:

This study examined the impact of air pollution, and more specifically the impact of traffic, on the health of urban trees. Due to the lack of data sets, urban tree growth modeling often relies on the existing knowledge of forest. However, urban trees differ from forest trees. One of the aims of the study is to fill the lacunae in this field. It was hypothesized that in streets with higher traffic volume, both growth parameters and health status of trees would be decreased in comparison to trees growing in streets with lower traffic volume. Four of the most common tree species growing in Berlin were selected: Tilia cordata Mill., Acer platanoides L., Platanus acerifolia (Aiton) Willd., and Aesculus hippocastanum L. Apart from the tree age and stand position (high and low traffic volume), the height and circumference were measured and the following traits were analyzed: trunk condition, crown defoliation, leaf discoloration, the presence of hollows and nests. The streets that were selected for the analysis were located in the center of Berlin. For each species, four streets with high traffic volume and four streets with low traffic volume were chosen. The car traffic volume had a significant impact on growth parameters. Significant differences in height and circumference between trees growing on streets with low or high traffic volume were noticed; the higher the traffic volume, the lower the tree height and circumference. This tendency is particularly visible in P. acerifolia, T. cordata and A. platanoides. This relation was observed in all species except for A. hippocastanum. In the conditions of high-traffic volume, A. platanoides is thriving revealing the smallest differences in vitali- ty and condition of the crown, trunk and leaves. The greatest differences in the health condition of the trees among the analyzed variants of traffic intensity were observed in the case of T. cordata. Lime trees seem to be most suitable for planting in the streets with lower traffic volume, whereas A. platanoides seems most suitable for planting in the streets with high traffic volume. P. acerifolia, despite its generally good health, is suffering from several progressing diseases. It is worth considering whether it should be gradually replaced with more resistant species. Aesculus, especially A. hippocastanum, are currently the most endangered ones. An alternative to this species can be A. carnea.

Źródło:

Dendrobiology; 2019, 82; 52-65
1641-1307

Pojawia się w:

Dendrobiology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 74.

Tytuł:

ForestTaxator : a tool for detection and approximation of cross-sectional area of trees in a cloud of 3D points

Autorzy:

Małaszek, Maciej
Zembrzuski, Andrzej
Gajowniczek, Krzysztof

Powiązania:

https://bibliotekanauki.pl/articles/2201227.pdf

Data publikacji:

2022

Wydawca:

Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Instytut Informatyki Technicznej

Tematy:

point cloud
genetic algorithms
trees
3D scan

Opis:

In this paper we propose a novel software, named ForestTaxator, supporting terrestrial laser scanning data processing, which for dendrometric tree analysis can be divided into two main processes: tree detection in the point cloud and development of three-dimensional models of individual trees. The usage of genetic algorithms to solve the problem of tree detection in 3D point cloud and its cross-sectional area approximation with ellipse-based model is also presented. The detection and approximation algorithms are proposed and tested using various variants of genetic algorithms. The work proves that the genetic algorithms work very well: the obtained results are consistent with the reference data to a large extent, and the time of genetic calculations is very short. The attractiveness of the presented software is due to the fact that it provides all necessary functionalities used in the forest inventory field. The software is written in C# and runs on the .NET Core platform, which ensures its full portability between Windows, MacOS and Linux. It provides a number of interfaces thus ensuring a high level of modularity. The software and its code are made freely available.

Źródło:

Machine Graphics & Vision; 2022, 31, 1/4; 19--48
1230-0535
2720-250X

Pojawia się w:

Machine Graphics & Vision

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 75.

Tytuł:

Dendroflora parku pałacowego w Kotowie (województwo wielkopolskie)
Dendroflora of the palace park in Kotowo (greater Poland voivodeship)

Autorzy:

Antkowiak, W.
Czekalski, M.

Powiązania:

https://bibliotekanauki.pl/articles/2130306.pdf

Data publikacji:

2018

Wydawca:

Uniwersytet Przyrodniczy w Poznaniu

Tematy:

palace landscape park
trees and shrubs
Kotowo
Wielkopolska

Opis:

The park at Kotowo was established in the early 20th century. It is 6.7 ha, with 80 species and cultivars trees and shrubs. Especially noteworthy are common bald cypress (Taxodium distichum) 255 cm circumference, many trees of common horse-chestnut (Aesculus hippocastanum), common ash (Fraxinus excelsior), saucer magnolia (Magnolia ×soulangiana), English oak (Quercus robur), little leaf linden form betulaefolia (Tilia cordata f. betulaefolia), big leaf linden subsp. cordifolia (Tilia platyphyllos subsp. cordifolia) and many another trees and shrubs.

Źródło:

Steciana; 2018, 22, 4; 177-189
1689-653X

Pojawia się w:

Steciana

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 76.

Tytuł:

Trees with equal restrained domination and total restrained domination numbers

Autorzy:

Raczek, Joanna

Powiązania:

https://bibliotekanauki.pl/articles/743684.pdf

Data publikacji:

2007

Wydawca:

Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii

Tematy:

total restrained domination number
restrained domination number
trees

Opis:

For a graph G = (V,E), a set D ⊆ V(G) is a total restrained dominating set if it is a dominating set and both ⟨D⟩ and ⟨V(G)-D⟩ do not have isolated vertices. The cardinality of a minimum total restrained dominating set in G is the total restrained domination number. A set D ⊆ V(G) is a restrained dominating set if it is a dominating set and ⟨V(G)-D⟩ does not contain an isolated vertex. The cardinality of a minimum restrained dominating set in G is the restrained domination number. We characterize all trees for which total restrained and restrained domination numbers are equal.

Źródło:

Discussiones Mathematicae Graph Theory; 2007, 27, 1; 83-91
2083-5892

Pojawia się w:

Discussiones Mathematicae Graph Theory

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 77.

Tytuł:

The number of clusters in hybrid predictive models: does it really matter?

Autorzy:

Łapczyński, Mariusz
Jefmański, Bartłomiej

Powiązania:

https://bibliotekanauki.pl/articles/1046637.pdf

Data publikacji:

2020

Wydawca:

Główny Urząd Statystyczny

Tematy:

hybrid predictive model
k-means algorithm
decision trees

Opis:

For quite a long time, research studies have attempted to combine various analytical tools to build predictive models. It is possible to combine tools of the same type (ensemble models, committees) or tools of different types (hybrid models). Hybrid models are used in such areas as customer relationship management (CRM), web usage mining, medical sciences, petroleum geology and anomaly detection in computer networks. Our hybrid model was created as a sequential combination of a cluster analysis and decision trees. In the first step of the procedure, objects were grouped into clusters using the k-means algorithm. The second step involved building a decision tree model with a new independent variable that indicated which cluster the objects belonged to. The analysis was based on 14 data sets collected from publicly accessible repositories. The performance of the models was assessed with the use of measures derived from the confusion matrix, including the accuracy, precision, recall, F-measure, and the lift in the first and second decile. We tried to find a relationship between the number of clusters and the quality of hybrid predictive models. According to our knowledge, similar studies have not been conducted yet. Our research demonstrates that in some cases building hybrid models can improve the performance of predictive models. It turned out that the models with the highest performance measures require building a relatively large number of clusters (from 9 to 15).

Źródło:

Przegląd Statystyczny; 2019, 66, 3; 228-238
0033-2372

Pojawia się w:

Przegląd Statystyczny

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 78.

Tytuł:

Drzewa-pomniki przyrody elementem funkcji turystycznej obszaru
The trees – nature monuments are elements of the tourist function of the area

Autorzy:

Pietrzak-Zawadka, Joanna

Powiązania:

https://bibliotekanauki.pl/chapters/32388083.pdf

Data publikacji:

2020

Wydawca:

Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej

Tematy:

pomniki przyrody
drzewa symboliczne w krajobrazie kulturowym
drzewa rekordowe
turystyka
nature monuments
symbolic trees in the cultural landscape
record trees
tourism

Opis:

Sędziwe okazy drzew oraz związane z nimi tajemnicze historie, wierzenia i legendy mogą stać się zasobem interesującym i przyciągającym turystów. Turystyka stwarza człowiekowi dogodne warunki do odbierania różnego rodzaju treści poznawczych i estetycznych oraz do zgłębiania różnych wartości. Drzewa, szczególnie cenne w wymiarze lokalnym i krajowym, a nawet europejskim, jako element naturalnego krajobrazu, wśród bogactwa zasobów przyrodniczych mogą stać się również podstawą rozwoju turystyki edukacyjnej. Te szczególne okazy dendroflory mogą stanowić przyrodniczą wizytówkę miejscowości i być ważnym elementem w jej promocji. W niniejszym rozdziale zaprezentowane zostały możliwości wykorzystania drzew pomnikowych jako obiektów dziedzictwa przyrodniczego i kulturowego, będących potencjalnym elementem realizacji funkcji turystycznej obszaru.
Aged specimens of trees and mysterious stories, beliefs and legends associated with them can become a resource of interest and attract tourists. Tourism creates favourable conditions for people to receive various types of cognitive and aesthetic content and to learn about multiple values. Trees, especially valuable locally nationally, and even Europe-wide, as part of the natural landscape, among the richness of natural resources, can also become the basis for the development of educational tourism. These special dendroflora specimens can be a natural showcase of the village and an important element of its promotion. This paper presents the possibilities of using monument trees in the development of the tourist function of the area as objects of natural and cultural heritage.

Źródło:

Obszary przyrodniczo cenne w rozwoju turystyki; 114-125
9788366391246

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 79.

Tytuł:

Estimating and testing relations and trees on the basis of pairwise comparisons

Autorzy:

Klukowski, Leszek

Powiązania:

https://bibliotekanauki.pl/articles/31342752.pdf

Data publikacji:

2022

Wydawca:

Polska Akademia Nauk. Instytut Badań Systemowych PAN

Tematy:

pairwise comparisons with random errors
estimation of relations
testing of relations
estimation of trees
testing of trees
nearest adjoining order idea

Opis:

The paper presents an ample account on author’s results, concerning the methods of estimating and testing of relations (equivalence, tolerance, preference) and trees on the basis of multiple pairwise comparisons with random errors, which are presented in a new book, Klukowski (2021c). The book contains also main results presented earlier in Klukowski (2011). The new content pertains mainly to: the preference relation with incomparable elements, trees and tests for verification of estimates of the relations. The estimators and tests have good statistical properties; estimators - consistency with good convergence, tests - known distributions of test statistics (exact, limiting or approximate). Some properties of estimates (precision and convergence) have been determined using the simulation approach. The results here reported gain in significance in view of the renewed interest in practical application of pairwise comparisons in various application domains, which give rise to various concrete data analysis problems.

Źródło:

Control and Cybernetics; 2022, 51, 4; 501--522
0324-8569

Pojawia się w:

Control and Cybernetics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 80.

Tytuł:

ZASTOSOWANIE DRZEW KLASYFIKACYJNYCH DO ANALIZY POKERA ONLINE
APPLICATION OF CLASSIFICATION TREES TO ANALYSE POKER GAME OUTCOME

Autorzy:

Zasłona, Marek
Ząbkowski, Tomasz

Powiązania:

https://bibliotekanauki.pl/articles/452770.pdf

Data publikacji:

2018

Wydawca:

Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Katedra Ekonometrii i Statystyki

Tematy:

eksploracja danych
drzewa klasyfikacyjne
poker
data mining
classification trees

Opis:

Niniejsza publikacja stanowi próbę scharakteryzowania deterministycznych czynników wpływających na wygraną w pokera. Przeprowadzono analizę w oparciu o jedną z metod eksploracji danych – drzewa klasyfikacyjne. Wybór tej techniki podyktowany był wykorzystaniem danych jakościowych jako zmiennych objaśniających rozgrywkę pokerową oraz prostotą prezentacji otrzymanych wyników, nawet przy bardzo rozbudowanych drzewach. W badaniu odkryto kilka czynników, które w istotny sposób mają wpływ na przebieg gry.
The paper aims to characterize key factors determining poker game outcome. The analysis was based on classification trees and this was due to the qualitative data used as the explanatory variables. The method enables clear presentation of the results even in case of very complex tree structures. The study describes also a few other factors that significantly influence the game outcome.

Źródło:

Metody Ilościowe w Badaniach Ekonomicznych; 2018, 19, 2; 192-201
2082-792X

Pojawia się w:

Metody Ilościowe w Badaniach Ekonomicznych

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 81.

Tytuł:

CLASSIFICATION OF POLISH HOUSEHOLDS BASED ON THEIR INCOMES BY MEANS OF DECISION TREES

Autorzy:

Karpio, Andrzej
Koszela, Grzegorz
Orłowski, Arkadiusz
Łukasiewicz, Piotr

Powiązania:

https://bibliotekanauki.pl/articles/452905.pdf

Data publikacji:

2014

Wydawca:

Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Katedra Ekonometrii i Statystyki

Tematy:

income distribution
high incomes
classification trees
entropy
SQL Server

Opis:

Classification trees included in SQL Server 2008R2 Analysis Services package have been used to classify Polish households based on their incomes. The analysis has been performed by means of the three algorithms and their effectiveness has been measured. Using the best algorithm a groups of households with the lowest and the largest incomes have been distinguished. The most important attributes describing households with the lowest and the largest incomes were identified and discussed.

Źródło:

Metody Ilościowe w Badaniach Ekonomicznych; 2014, 15, 2; 403-413
2082-792X

Pojawia się w:

Metody Ilościowe w Badaniach Ekonomicznych

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 82.

Tytuł:

Fast Data Collection in Tree-Based Wireless Sensor Networks

Autorzy:

Parashiva Murthy, B. M.
Tanuja, K.
Rakshitha, M.
Supretha, S.

Powiązania:

https://bibliotekanauki.pl/articles/1193576.pdf

Data publikacji:

2016

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

Convergecast
TDMA scheduling
multiple channels
power-control
routing trees

Opis:

The below work is done to address the things like how fast can information be collected from a wireless sensor network organized as tree using realistic simulation models under the many-to-one communication paradigm known as converge cast. We first consider time scheduling on a single frequency channel with the aim of minimizing the number of time slots required to complete a converge cast. Next, we combine scheduling with transmission power control to mitigate the effects of interference, and show that while power control helps in reducing the schedule length under a single frequency, scheduling transmissions using multiple frequencies is more efficient. To this end, we construct degree-constrained spanning trees and capacitated minimal spanning trees, and show significant improvement in scheduling performance over different deployment densities. Lastly, we evaluate the impact of different interference and channel models on the schedule length.

Źródło:

World Scientific News; 2016, 41; 230-238
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 83.

Tytuł:

A new algorithm for generation of decision trees

Autorzy:

Grzymała-Busse, J. W.
Hippe, Z. S.
Knap, M.
Mroczek, T.

Powiązania:

https://bibliotekanauki.pl/articles/1965778.pdf

Data publikacji:

2004

Wydawca:

Politechnika Gdańska

Tematy:

artificial intelligence
supervised machine learning
decision trees
Bayes networks

Opis:

A new algorithm for development of quasi-optimal decision trees, based on the Bayes theorem, has been created and tested. The algorithm generates a decision tree on the basis of Bayesian belief networks, created prior to the formation of the decision tree. The efficiency of this new algorithm was compared with three other known algorithms used to develop decision trees. The data set used for the experiments was a set of cases of skin lesions, histopatolgically verified.

Źródło:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2004, 8, 2; 243-247
1428-6394

Pojawia się w:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 84.

Tytuł:

Redukcja czasu analizy MZP przez ograniczenie rozmiaru rozwiązania
Reduction of MCS analysis time by reducing size of the result

Autorzy:

Gołaszewski, G.

Powiązania:

https://bibliotekanauki.pl/articles/268758.pdf

Data publikacji:

2013

Wydawca:

Politechnika Gdańska. Wydział Elektrotechniki i Automatyki

Tematy:

drzewo niezdatności
zależności czasowe
ECSDM
fault trees
timing relationships

Opis:

Analiza drzew niezdatności jest uznaną metodą analizy bezpieczeństwa systemów. Notacja ECSDM pozwala definiować zależności czasowe między zdarzeniami drzewa oraz przeanalizować je w celu określenia zależności pomiędzy zdarzeniami z Minimalnych Zbiorów Przyczyn (MZP). Dzięki wprowadzeniu klasyfikacji zdarzeń z MZP można wyodrębnić zależności czasowe istotne dla zapobiegania wywoływania hazardu przez konkretny MZP. Pozostałe zależności czasowe są w tym podejściu odrzucane. Opracowano odmiany algorytmu analizy zależności czasowych w drzewach niezdatności, które są w stanie odrzucić część zależności czasowych na wcześniejszym etapie analizy. W tym artykule omówiony zostanie eksperyment określający redukcję czasu przetwarzania uzyskaną dzięki zastosowania tych zmian.
Fault tree analysis is an accepted systems safety analysis method. ECSDM notation allows for definition of timing relationships between events of the tree. These relationships are then analyzed in order to derive timing relationships between events in Minimal Cut Sets. Introduction of events classification allows for extraction from MCS timing relationships relevant to prevention of that given MCS. Timing relationships not selected in that step are ignored. Therefore a set of new algorithms for analysis of timing relationships in fault trees was proposed. Each of these algorithms filters out some of the irrelevant relationships in earlier steps of the analysis. In this article an experiment aimed at determining the gain (understood as processing time reduction) from applying these algorithms is described.

Źródło:

Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej; 2013, 36; 61-64
1425-5766
2353-1290

Pojawia się w:

Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 85.

Tytuł:

Trees with equal global offensive k-alliance and k-domination numbers

Autorzy:

Chellali, M.

Powiązania:

https://bibliotekanauki.pl/articles/255451.pdf

Data publikacji:

2010

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH

Tematy:

global offensive k-alliance number
k-domination number
trees

Opis:

Let k ≥ 1 be an integer. A set S of vertices of a graph G = (V (G), E(G)) is called a global offensive k-alliance if |N(v) ∩ S| ≥ |N(v) - S| + k for every v ∈ V (G) - S, where N(v) is the neighborhood of v. The subset S is a k-dominating set of G if every vertex in V (G) - S has at least k neighbors in S. The global offensive k-alliance number [formula] is the minimum cardinality of a global offensive k-alliance in G and the k-domination number ϒ k(G) is the minimum cardinality of a k-dominating set of G. For every integer k ≥ 1 every graph G satisfies [formula]. In this paper we provide for k ≥ 2 a characterization of trees T with equal [formula] and ϒ k(T).

Źródło:

Opuscula Mathematica; 2010, 30, 3; 249-254
1232-9274
2300-6919

Pojawia się w:

Opuscula Mathematica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 86.

Tytuł:

“Dogwood and Chestnut, Flowering Judas”: The Role of Tree Images in T.S. Eliot’s Poetry

Autorzy:

Wilde, Julia

Powiązania:

https://bibliotekanauki.pl/articles/601313.pdf

Data publikacji:

2019

Wydawca:

Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej

Tematy:

T.S. Eliot
poetry
trees
literature
modernism
culture
symbol

Opis:

The aim of this paper is to examine the role of the tree depictions in T.S. Eliot’s poetry and to demonstrate the way they enrich interpretations of particular poems. In every culture the tree symbolizes similar notions such as life or rebirth. Yet, different tree species have been believed to possess certain properties and sometimes even personalities – this knowledge is passed on through cultural transmission and thus may linger on the edges of one’s consciousness. This seems also true for T.S. Eliot and the symbolism of the trees appearing in his poetry. Despite the fact that they tend to be presented either as a background or the scenery for the lyrical situation, one should not assume that they were chosen accidentally – especially given the purposefulness and rich symbolism of Eliot’s writings. For this reason, the analysis of tree depictions in Eliot’s selected poems reveals new aspects of interpretations, drawing attention to the connection between the author and the culture he was rooted in.

Źródło:

New Horizons in English Studies; 2019, 4
2543-8980

Pojawia się w:

New Horizons in English Studies

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 87.

Tytuł:

Pomniki przyrody i drzewa pomnikowe powiatu górowskiego (dolnośląskie)
Nature monuments and monumental trees in the Gora county (dolnośląskie province)

Autorzy:

Antkowiak, W.
Polega, M.

Powiązania:

https://bibliotekanauki.pl/articles/2130345.pdf

Data publikacji:

2018

Wydawca:

Uniwersytet Przyrodniczy w Poznaniu

Tematy:

nature monument
monumental trees
the Góra county
nature protection

Opis:

The paper presents results of a survey of natural monuments and monumental trees in the Góra county, Poland. During the field research it was found that there are 32 monuments of nature in the commune of Góra, five objects in the Jemielno commune, five objects in the Niechlów commune, and 46 monuments of nature in the Wąsosz commune. A total number of 93 trees were inventoried – 80 individual trees and one avenue. Six trees could not be found due to lack of information about their location. The health condition of most of the monuments can be considered as very good, most of the trees have minor damage to the branches. Nevertheless, there are specimens with worse health, and even a few are dead. Seventhy six monuments of nature of the Górowski commune are native species, among which the most common are pedunculate oaks (53 trees). The tree with the largest circumference of 819 cm. is a plane tree (monument of nature No. 351, Lechitów, Wąsosz commune). Numerical changes were noticed in the case of the platane alley in Ślubów and two other monuments of nature. There are no monuments of inanimate nature in the Górowski commune. There are 28 individual trees eligible for protection under the monument of nature.

Źródło:

Steciana; 2018, 22, 4; 195-209
1689-653X

Pojawia się w:

Steciana

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 88.

Tytuł:

On The Total Roman Domination in Trees

Autorzy:

Amjadi, Jafar
Sheikholeslami, Seyed Mahmoud
Soroudi, Marzieh

Powiązania:

https://bibliotekanauki.pl/articles/31343413.pdf

Data publikacji:

2019-05-01

Wydawca:

Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii

Tematy:

total Roman dominating function
total Roman domination number
trees

Opis:

A total Roman dominating function on a graph G is a function f : V (G) → {0, 1, 2} satisfying the following conditions: (i) every vertex u for which f(u) = 0 is adjacent to at least one vertex v for which f(v) = 2 and (ii) the subgraph of G induced by the set of all vertices of positive weight has no isolated vertex. The weight of a total Roman dominating function f is the value f(V (G)) = Σ_u∈V(G) f(u). The total Roman domination number γtR(G) is the minimum weight of a total Roman dominating function of G. Ahangar et al. in [H.A. Ahangar, M.A. Henning, V. Samodivkin and I.G. Yero, Total Roman domination in graphs, Appl. Anal. Discrete Math. 10 (2016) 501–517] recently showed that for any graph G without isolated vertices, 2γ(G) ≤ γ_tR(G) ≤ 3γ(G), where γ(G) is the domination number of G, and they raised the problem of characterizing the graphs G achieving these upper and lower bounds. In this paper, we provide a constructive characterization of these trees.

Źródło:

Discussiones Mathematicae Graph Theory; 2019, 39, 2; 519-532
2083-5892

Pojawia się w:

Discussiones Mathematicae Graph Theory

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 89.

Tytuł:

Zdrowotność oraz zagrożenia drzew przyulicznych w centrum Opola
Healthand hazards of roadside trees in the central of Opole

Autorzy:

Gołąbek, E.
Sławiński, J.

Powiązania:

https://bibliotekanauki.pl/articles/949963.pdf

Data publikacji:

2010

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

drzewa przyuliczne
gatunki rodzime
gatunki obce
zdrowotność drzew
zagrożenia zdrowotności
roadside trees
native species
alien species
health of trees
health hazard

Opis:

W publikacji przedstawiono ocenę zdrowotności drzew przyulicznych (rosnących między jezdnią a chodnikiem) w centrum Opola. Do oceny zdrowotności zastosowano metodę 1. Dudy, obejmującą dwunastostopniową skalę. Zbadano 13 gatunków drzew, z których najliczniejszymi, stanowiącymi 63,8% były: lipa drobnolistna, kasztanowiec pospolity, robinia biała, lipa szerokolistna. Wyróżniono 8 gatunków rodzimych oraz 5 obcych w naszej florze. Wśród badanych obiektów największy udział (78,1 %) miały drzewa w dobrej kondycji zdrowotnej. Drzew w złym i bardzo złym stanie było odpowiednio 19,3% i 2,6%. Wśród gatunków rodzimych stwierdzono 75,7% egzemplarzy w stanie dobrym, 21,0% w złym i 3,3% w bardzo złym. Wśród gatunków obcych w stanie dobrym było 81,4%, złym 16,8% i bardzo złym 1,8%. Z czynników działających negatywnie na stan zdrowotny drzew rozpoznano m.in.: uszkodzenia mechaniczne, chlorozy, patogeny i szkodniki. The publication presents an evaluation ofhealth status of roadside trees (growing between the road and the pavement) in the central part of the city of Opole. To assess the health condition of the trees the method proposed by 1. Duda was used, whereby the health of a tree is assessed in the twelve gradual scale. Among the surveyed trees, 13 species were found, of which the most abundant, constituting 63.8% of the examined group were: TWa cordata, Aesculus hippocastanum, Robinia pseudoacacia, Tilia platyphyllos. Eight native and five alien species in the domestic flora were distinguished. Among the studied objects definitely the largest share - 78.1 % had the trees in good health. The specimens in poor and very poor condition constituted 19.3% and 2.6% respectively. In the group representing the native species oftrees, 75.7% of the specimens in good condition, 21.0% in poor and 3.3% in very poor was noted, while among the alien species 81.4% were in good condition, 16.8% in bad and 1.8% in very poor. Among the factors negalively affecting the health status oftrees, mechanical damages, chloroses, pathogens and pests were identified.
The publication presents an evaluation ofhealth status of roadside trees (growing between the road and the pavement) in the central part of the city of Opole. To assess the health condition of the trees the method proposed by 1. Duda was used, whereby the health of a tree is assessed in the twelve gradual scale. Among the surveyed trees, 13 species were found, of which the most abundant, constituting 63.8% of the examined group were: TWa cordata, Aesculus hippocastanum, Robinia pseudoacacia, Tilia platyphyllos. Eight native and five alien species in the domestic flora were distinguished. Among the studied objects definitely the largest share - 78.1 % had the trees in good health. The specimens in poor and very poor condition constituted 19.3% and 2.6% respectively. In the group representing the native species oftrees, 75.7% of the specimens in good condition, 21.0% in poor and 3.3% in very poor was noted, while among the alien species 81.4% were in good condition, 16.8% in bad and 1.8% in very poor. Among the factors negalively affecting the health status oftrees, mechanical damages, chloroses, pathogens and pests were identified.

Źródło:

Inżynieria Ekologiczna; 2010, 23; 7-13
2081-139X
2392-0629

Pojawia się w:

Inżynieria Ekologiczna

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 90.

Tytuł:

A Multivariate Study of T/V Forms in European Languages Based on a Parallel Corpus of Film Subtitles

Autorzy:

Levshina, Natalia

Powiązania:

https://bibliotekanauki.pl/articles/620953.pdf

Data publikacji:

2017

Wydawca:

Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego

Tematy:

T/V pronouns
politeness
film subtitles
conditional inference trees

Opis:

The present study investigates the cross-linguistic differences in the use of so-called T/V forms (e.g. French tu and vous, German du and Sie, Russian ty and vy) in ten European languages from different language families and genera. These constraints represent an elusive object of investigation because they depend on a large number of subtle contextual features and social distinctions, which should be cross-linguistically matched. Film subtitles in different languages offer a convenient solution because the situations of communication between film characters can serve as comparative concepts. I selected more than two hundred contexts that contain the pronouns you and yourself in the original English versions, which are then coded for fifteen contextual variables that describe the Speaker and the Hearer, their relationships and different situational properties. The creators of subtitles in the other languages have to choose between T and V when translating from English, where the T/V distinction is not expressed grammatically. On the basis of these situations translated in ten languages, I perform multivariate analyses using the method of conditional inference trees in order to identify the most relevant contextual variables that constrain the T/V variation in each language.

Źródło:

Research in Language; 2017, 15, 2; 153-172
1731-7533

Pojawia się w:

Research in Language

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 91.

Tytuł:

Using Decision Trees to Evaluate Courier Companies from the Perspective of Online Retailers

Autorzy:

Kulińska, Ewa
Wojtynek, Lilianna
Dendera-Gruszka, Małgorzata
Flauder, Sandra

Powiązania:

https://bibliotekanauki.pl/articles/503776.pdf

Data publikacji:

2017

Wydawca:

Międzynarodowa Wyższa Szkoła Logistyki i Transportu

Tematy:

decision-making process
decision trees
service companies
online sales

Opis:

The analysis of the research problem started from listing the issues of decision theory and the decision-making process that support the process of building decision trees. The area in question covers a procedure for building and proceeding when creating decision trees. The solution to the research problem consists in defining decision variables and arranging them into logical statements by writing down all possible variants and only accounting for the true ones. True solutions derived from coding were detailed and the number of occurring decision trees was calculated in the case under consideration. The decision problem was presented in the form of decision trees, which made it possible to select the optimum decision tree. The obtained results were considered and the optimum decision tree was chosen. At the same time, the record of decision variables was analyzed, providing the answer as to which courier company will best meet expectations of entrepreneurs and ensure the most satisfying cooperation. That company turned out to be K-EX. The article aimed to select a courier company from the perspective of online retailers, with the selection having been made using the method of decision trees based on four basic criteria defined within the research.

Źródło:

Logistics and Transport; 2017, 35, 3; 59-66
1734-2015

Pojawia się w:

Logistics and Transport

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 92.

Tytuł:

Ekonomiczno-Społeczne Uwarunkowania Migracji Wewnętrznych W Polsce W Świetle Metody Drzew Klasyfikacyjnych
Economic and Social Determinants of Internal Migration in Poland in the Light of the Classification Trees Method

Autorzy:

Matusik, Stanisław
Pietrzak, Michał Bernard
Wilk, Justyna

Powiązania:

https://bibliotekanauki.pl/articles/418320.pdf

Data publikacji:

2012

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

classification trees method
internal migration
economic and social factors

Opis:

This paper analyses socio-economic determinants of migration flows between Polish sub-regions in the years 2008-2010 by using the classification trees (CART) method. Six explanatory variables are selected to determine migration, including GDP per capita, number of economic entities (firms) per 100 inhabitants, investment assets and tangible assets per capita, registered unemployment rate, as well as average monthly salary. The CART method is then used to build models explaining the classification of migration flows into four quartile-based categories. The results confirm that the classification of internal migration flows is strongly determined by socio-economic features, in particular the number of economic entities, investment assets per capita and the unemployment rate. The suburbanisation from cities to neighbouring sub-regions is clearly demonstrated. Better developed regions, especially the largest Polish cities, have the highest migration outflows as well as inflows, yet retain positive net migration. We argue that the proposed analytical approach enables to determine the multidimensional relationships between explanatory social-economic variables and the migration coefficients under study.

Źródło:

Studia Demograficzne; 2012, 162, 2; 3-28
0039-3134

Pojawia się w:

Studia Demograficzne

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 93.

Tytuł:

Multiple Additive Regression Trees (MART) and their Application
Addytywna metoda budowy drzew regresyjnych (MART) i jej zastosowanie

Autorzy:

Trzęsiok, Joanna

Powiązania:

https://bibliotekanauki.pl/articles/906893.pdf

Data publikacji:

2007

Wydawca:

Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego

Tematy:

multivariate regression
adaptive method
regression trees
gradient boosting
MART

Opis:

Multiple additive regression trees MART is a methodology for trying to solve prediction problems in regression and classification. It’s one of the boosting methods. It was introduced by J. H. Friedman (1999a). Besides accuracy, its primary goal is robustness. It lends to be resistant against outliers, missing values, and the inclusion of potentially large numbers of irrelevant predictor variables that have little or no effect on the response. In this paper the MART algorithm and their applications will be discussed.
Addytywna metoda budowy drzew regresyjnych (MART), została zaproponowana przez J. H. Friedmana w 1999 r. (1999a, b). Jest to jedna z metod agregacyjnych, mająca zastosowanie w regresji i dyskryminacji opierająca się na modelach w postaci drzew. Jej zaletami, poza dokładnością predykcji, jest odporność na wartości oddalone i braki danych. Bardzo dobrze radzi sobie również z dużą liczbą zmiennych objaśniających, wśród których wiele może nie mieć istotnego wpływu na zmienną zależną. W artykule przedstawiona została ogólna idea metod agregacyjnych. Zaprezentowano i omówiono kolejne kroki algorytmu MART, a następnie, dla ilustracji, podany został przykład zastosowania procedury MART dla zbioru danych „Boston”.

Źródło:

Acta Universitatis Lodziensis. Folia Oeconomica; 2007, 206
0208-6018
2353-7663

Pojawia się w:

Acta Universitatis Lodziensis. Folia Oeconomica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 94.

Tytuł:

Distribution and relative density of trees species in Kainji Lake National Park, Nigeria

Autorzy:

Akande, O. A.
Ahmad, Y. A.
Shuaib, A. B.
Jeje, C. A.

Powiązania:

https://bibliotekanauki.pl/articles/1077871.pdf

Data publikacji:

2019

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

Distribution
Kainji Lake National Park
relative density
species
trees

Opis:

The importance of trees in the environment cannot be overemphasized. This present study, therefore, deals with the distribution and relative density of trees species in Kainji Lake National Park. Data were collected using plot sampling techniques. Therein, a 50 by 50 m2 plot was randomly laid. Within each sample plot, data on all trees ≥ 10 cm in diameter at breast height were enumerated. The data were analyzed using descriptive statistics. The result shows that different types of plants species were enumerated in the selected plots. This included six families of trees: Fabiaceae, Caesalpiniaceae, Rubiaceae, Maliaceae, Annonaceae and Mimosaceae. The percentage score of tree species in the four plots reveals that Afzelia africana recorded the highest with a total number of 60 species, followed by Detarium macrocarpium with 47 species, while Anogeissus leiocarpus and Azadirachta indica recorded 31 and 17 species, respectively. Gardenia aqualla was the least species recorded. The density and relative density of Afzelia africana recorded the highest, with 1.2ha and 26.9%, followed by Detarium microcarpiuum with 0.94ha and 21.1%, respectively, while Gardenia aqualla was the least with 0.02 ha and 0.4%. In terms of mean height, Daniela oliveri recorded the highest, with 28.1m, followed by Afzelia africana with 21.8%, while Azadirachta indica was the least with 5.8%. The mean DBH of Entada africana and Anogeissus leiocarpus recorded was 28.7cm and 28.1cm, while Prosopis africana and Accacia gournmaensis recorded 14.0 and 13.4, respectively, which were the least. The Types of wild animal species that are associated with the tree species includes Baboon, Kob, Grim duiker, Francolin, Patas monkey etc. Relative abundance of the animal species shows that Papio anubis recorded the highest with 40.5 individuals, while Erythrocebus patas recorded the least with 2.5 individuals.

Źródło:

World News of Natural Sciences; 2019, 22; 52-61
2543-5426

Pojawia się w:

World News of Natural Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 95.

Tytuł:

Jałowiec pospolity (Juniperus communis) z Nepli nad Bugiem
Common juniper (Juniperus communis) from Neple on the Bug River

Autorzy:

Borkowski, Krzysztof
Boratyński, Adam
Boratyńska, Krystyna

Powiązania:

https://bibliotekanauki.pl/articles/1186068.pdf

Data publikacji:

2020-02-19

Wydawca:

Polskie Towarzystwo Dendrologiczne

Tematy:

dendrology
monumental trees
photographic documentation
Lublin province
Kórnik Arboretum

Opis:

Juniperus communis (common juniper) is a shrub or small tree. Tree-like junipers are rare but important landscape elements. Even the largest junipers are rarely older than 100–120 years old. We would like to show some data on probably the oldest and by far the largest common juniper in Poland, blown down in 1957. It grew in village of Neple, in the park of the Bug and Krzna rivers (52.126°N, 23.517°E). Its age was estimated at c. 300 years, and it attained more than 10 m in height and c. 3 m circumference at 1.3 m above ground level. It was found that the basal part of the trunk was rotten inside, which makes it impossible to determine its exact age. The trunk with its main boughs was transported to the Kórnik Arboretum, conserved and preserved in the form of a monument until today. To our best knowledge, it was the largest common juniper in Poland and the second largest in Europe.

Źródło:

Rocznik Polskiego Towarzystwa Dendrologicznego; 2019, 67; 25-38
2080-4164
2300-8326

Pojawia się w:

Rocznik Polskiego Towarzystwa Dendrologicznego

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 96.

Tytuł:

Active learning using pessimistic expectation estimators

Autorzy:

Rokach, L.
Naamani, L.
Shmilovici, A.

Powiązania:

https://bibliotekanauki.pl/articles/970816.pdf

Data publikacji:

2009

Wydawca:

Polska Akademia Nauk. Instytut Badań Systemowych PAN

Tematy:

cost-sensitive learning
active learning
direct marketing
decision trees

Opis:

Active learning is the process in which unlabeled instances are dynamically selected for expert labelling, and then a classifier is trained on the labeled data. Active learning is particularly useful when there is a large set of unlabeled instances, and acquiring a label is costly. In business scenarios such as direct marketing, active learning can be used to indicate which customer to approach such that the potential benefit from the approached customer can cover the cost of approach. This paper presents a new algorithm for cost-sensitive active learning using a conditional expectation estimator. The new estimator focuses on acquisitions that are likely to improve the profit. Moreover, we investigate simulated annealing techniques to combine exploration with exploitation in the classifier construction. Using five evaluation metrics, we evaluated the algorithm on four benchmark datasets. The results demonstrate the superiority of the proposed method compared to other algorithms.

Źródło:

Control and Cybernetics; 2009, 38, 1; 261-280
0324-8569

Pojawia się w:

Control and Cybernetics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 97.

Tytuł:

„Cytowałam zdania z wnętrza drzew”. „minimum” Urszuli Zajączkowskiej

Autorzy:

Gralewicz-Wolny, Iwona

Powiązania:

https://bibliotekanauki.pl/articles/2080497.pdf

Data publikacji:

2020-12-23

Wydawca:

Uniwersytet Pedagogiczny im. Komisji Edukacji Narodowej w Krakowie

Tematy:

Urszula Zajączkowska
drzewa
ekokrytyka
minimum
the minimum
trees
ecocriticism

Opis:

Artykuł jest próbą lektury ostatniego tomiku poezji Urszuli Zajączkowskiej tropem trzech zamieszczonych w nim wierszy: w koronach, miejsce przy oknie i wysokie drzewa. Wszystkie odwołują się do wątków dendrologicznych, reprezentując tym samym jeden z kilku, lecz być może najważniejszy obszar przyrodniczych zainteresowań autorki Atomów. Wymienione utwory zostały potraktowane w interpretacji jako emblematy pojęć, odpowiednio, kontaktu, komunikacji i kreacji, wyznaczając kierunki lektury pozostałych zgromadzonych w tomie wierszy.
This paper is an attempt to read the last volume of poetry by Urszula Zajączkowska with the trail of three poems: w koronach [in the crowns], miejsce przy oknie [a window seat] and wysokie drzewa [tall trees]. They all refer to dendrological threads, thus representing one of several, but perhaps the most important area of the natural interest of the author of Atomy [Atoms]. These works have been interpreted as emblems of concepts, respectively, contact, communication and creation, setting the reading directions of the other poems collected in the volume.

Źródło:

Annales Universitatis Paedagogicae Cracoviensis. Studia Poetica; 2020, 8; 43-52
2353-4583
2449-7401

Pojawia się w:

Annales Universitatis Paedagogicae Cracoviensis. Studia Poetica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 98.

Tytuł:

On Closed Modular Colorings of Trees

Autorzy:

Phinezy, Bryan
Zhang, Ping

Powiązania:

https://bibliotekanauki.pl/articles/30146543.pdf

Data publikacji:

2013-05-01

Wydawca:

Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii

Tematy:

trees
closed modular k-coloring
closed modular chromatic number

Opis:

Two vertices $u$ and $v$ in a nontrivial connected graph $G$ are twins if $u$ and $v$ have the same neighbors in $V (G)$ − ${u, v}$. If $u$ and $v$ are adjacent, they are referred to as true twins; while if $u$ and $v$ are nonadjacent, they are false twins. For a positive integer $k$, let $c : V (G) \rightarrow \mathbb{Z}_k $ be a vertex coloring where adjacent vertices may be assigned the same color. The coloring $c$ induces another vertex coloring $ c^′ : V (G) \rightarrow \mathbb{Z}_k $ defined by $ c′(v) = \Sigma_{u \in N[v]} c(u) $ for each $ v \in V (G) $, where $N[v]$ is the closed neighborhood of $v$. Then $c$ is called a closed modular $k$-coloring if $c^′(u) \ne c′(v)$ in $ \mathbb{Z}_k$ for all pairs $u$, $v$ of adjacent vertices that are not true twins. The minimum $k$ for which $G$ has a closed modular $k$-coloring is the closed modular chromatic number $ \overline{mc}(G) $ of $G$. The closed modular chromatic number is investigated for trees and determined for several classes of trees. For each tree $T$ in these classes, it is shown that $ \overline{mc} (T) = 2$ or $ \overline{mc}(T) = 3 $. A closed modular $k$-coloring $c$ of a tree $T$ is called nowhere-zero if $c(x) \ne 0 $ for each vertex $x$ of $T$. It is shown that every tree of order 3 or more has a nowhere-zero closed modular 4-coloring.

Źródło:

Discussiones Mathematicae Graph Theory; 2013, 33, 2; 411-428
2083-5892

Pojawia się w:

Discussiones Mathematicae Graph Theory

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 99.

Tytuł:

Completely Independent Spanning Trees in k-th Power of Graphs

Autorzy:

Hong, Xia

Powiązania:

https://bibliotekanauki.pl/articles/31342277.pdf

Data publikacji:

2018-08-01

Wydawca:

Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii

Tematy:

completely independent spanning tree
power of graphs
spanning trees

Opis:

Let T₁, T₂, . . ., T_k be spanning trees of a graph G. For any two vertices u, v of G, if the paths from u to v in these k trees are pairwise openly disjoint, then we say that T₁, T₂, . . ., T_k are completely independent. Araki showed that the square of a 2-connected graph G on n vertices with n ≥ 4 has two completely independent spanning trees. In this paper, we prove that the k-th power of a k-connected graph G on n vertices with n ≥ 2k has k completely independent spanning trees. In fact, we prove a stronger result: if G is a connected graph on n vertices with δ(G) ≥ k and n ≥ 2k, then the k-th power G^k of G has k completely independent spanning trees.

Źródło:

Discussiones Mathematicae Graph Theory; 2018, 38, 3; 801-810
2083-5892

Pojawia się w:

Discussiones Mathematicae Graph Theory

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 100.

Tytuł:

Liczba pomników przyrody i drzew pomnikowych w Polsce na podstawie inwentaryzacji Generalnej Dyrekcji Ochrony Środowiska z lat 2014-2015
Number of natural monuments and monumental trees in Poland based on the General Directorate for Environmental Protection inventory from the years 2014-2015

Autorzy:

Zarzyński, P.

Powiązania:

https://bibliotekanauki.pl/articles/979519.pdf

Data publikacji:

2019

Wydawca:

Polskie Towarzystwo Leśne

Tematy:

ochrona przyrody
pomniki przyrody
drzewa pomnikowe
grupy drzew
aleje drzew
sklad gatunkowy
Polska
natural monuments
monumental trees
the girthest trees of poland

Opis:

In 2014−2015, the General Directorate for Environmental Protection carried out an inventory of natural monuments in Poland. The data collected during this process was used to update and expand the generally available Central Register of Nature Protection Forms (CRFOP). Based on these material, the assignment of nature monuments to particular categories was verified and their number in individual categories was calculated. In addition, the species composition of trees being single monuments of nature and growing in monumental groups and alleys was determined. The total number of monumental trees in Poland was also calculated, with the division into species. For the 50 of most popular individual monument tree species, the minimum, maximum and average circumferences of their trunks were determined. A group of the most impressive monument trees with trunk circumferences exceeding 600 cm was also selected. According to the calculations, there are 36,570 natural monuments in Poland, of which 94% are trees and shrubs (individual trees – 28,304, groups of trees – 551 and alleys – 525). Individual trees natural monuments represent at least 161 species, trees growing in groups of at least 123 species, and trees growing in alleys at least 53 species. The total number of monumental trees growing as single specimens, in groups and alleys is at least 123,784 pieces, with at least 46,636 trees growing in groups, and at least 48,844 trees in alleys. In total, the monumental trees of Poland (growing singly, in groups and alleys) belong to at least 178 species, including 51 gymnosperms and 127 angiosperms. The CRFOP data also shows that there are 1641 trees that have reached or exceeded the trunk circumference of 600 cm, among which there are 77 specimens with a circumference equal to or greater than 800 cm. However these data do not coincide with information available in current literature and they need to be verified. The obtained calculations are the most up−to−date report on the numerical status of trees – natural monuments based on data confirmed by field inventory, and not only on the registers of nature monuments containing often unverified or non−actual data.

Źródło:

Sylwan; 2019, 163, 03; 248-257
0039-7660

Pojawia się w:

Sylwan

Dostawca treści:

Biblioteka Nauki

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