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Tytuł:
A method of artificial potential fields for the determination of ship’s safe trajectory
Autorzy:
Mielniczuk, S.
Powiązania:
https://bibliotekanauki.pl/articles/135673.pdf
Data publikacji:
2017
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
path planning
artificial potential fields
obstacles
safety
navigation
collision
Opis:
Various methods of trajectory determination are used for finding solutions to collision situations involving ships. This applies to avoiding collisions with other ships or stationary objects. In addition to the methods generally used, new or modified versions of methods derived from other modes of transport are proposed. One of the algorithms for route determination serving to avoid obstructions is the method of artificial potential fields, used for determining routes of mobile robots. The method is used in maritime transport, for instance for detecting anomalies in ship movement. The article presents the method of potential fields used for solving the problem of route selection avoiding navigational dangers and obstacles. This article presents an algorithm of route determination based on the said method, its implementation in the MATLAB program and examples of application for the ship’s safe trajectory determination in some navigational situations.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2017, 51 (123); 45-49
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The modified artificial potential fields method in collision situations at sea
Autorzy:
Mielniczuk, Sylwia
Powiązania:
https://bibliotekanauki.pl/articles/29521054.pdf
Data publikacji:
2023
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
collision avoidance maneuvers
ship encounters
safety
artificial potential field method
repulsion coefficients
APF factor
Opis:
This paper proposes a modified artificial potential fields (APF) method for collision avoidance at sea. The concept of artificial potentials used herein is derived from fields generated by electric charges. Attractive and repulsive forces are determined, accounting for the positions of an own vessel and a target vessel. The own vessel and its goal are considered as opposite charges. There is an attractive force between them, while the own vessel and target vessels or obstacles are considered as charges with a repulsive force between them. The values of these forces depend on the coefficients of attraction and repulsion. To solve a particular collision situation, the modified method of artificial potential fields is used. Due to the specific nature of the vessels’ movement, additional factors affecting the values of the attraction and repulsive forces are considered, as opposed to solutions used for robots. The main purpose of this article is to present the method for determining the coefficients of the APF method. This method will be used to avoid collisions at sea. From an analysis of factors influencing the execution of the vessel maneuver in a collision situation, a modified method for determining the attraction and repulsion coefficients is proposed. A case study of collision avoidance in a vessel encounter situation is also conducted.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2023, 73 (145); 73-81
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Norwegian organisational culture. A case study from a Norwegian organisation
Autorzy:
Mielniczuk, Hanna
Powiązania:
https://bibliotekanauki.pl/articles/1013708.pdf
Data publikacji:
2021-03-14
Wydawca:
Uniwersytet Ekonomiczny w Poznaniu
Tematy:
organisational culture
dominant type of culture
questionnaire survey
enterprise
Norway
Opis:
This paper presents the concept of organisational culture, with a particular emphasis on Norwegian organisational culture. It explains why organisational culture plays an important role in an organisation’s success and features the main determinants of Norwegian organisational culture which distinguish it from other organisational cultures and support the coherent functioning of the organisation. The assessment of Norwegian organisational culture showed that Norwegian organisations are dominated by a clan-like culture, also showing the features of female culture, and thus based on trust, cooperation and compliance of goals. The research carried out for the purposes of this study showed the compliance of the cultural profile of the studied enterprise with the profile of Norwegian organisational culture – the responses of the employees of the Beta Hotel allow us to draw conclusions that the company is also dominated by the clan culture and features of female organisational culture. The results of the study show that employees of an organisation identify with their internal system of values, which may translate into the effectiveness of their work and social relations, and, as a result, the success of the organisation.
Źródło:
Research Papers in Economics and Finance; 2020, 4, 4; 7-14
2543-6430
Pojawia się w:
Research Papers in Economics and Finance
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On Fisher-type inequalities for designs on regular graphs
O nierówności Fishera dla układów na grafach regularnych
Autorzy:
Mielniczuk, J.
Powiązania:
https://bibliotekanauki.pl/articles/9821.pdf
Data publikacji:
2008
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Katedra Zastosowań Matematyki i Informatyki
Tematy:
Fisher-type inequality
design
regular graph
graph theory
Źródło:
Colloquium Biometricum; 2008, 38
1896-7701
Pojawia się w:
Colloquium Biometricum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The occurrence of Fusarium spp. on panicles of oat [Avena sativa L.]
Autorzy:
Mielniczuk, E
Powiązania:
https://bibliotekanauki.pl/articles/65605.pdf
Data publikacji:
2001
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
plant disease
Avena sativa
avenacin
panicle
Fusarium poae
panicle blight
occurrence
oat
Fusarium avenaceum
Fusarium
Opis:
Investigations were carried out in 1996-1998 on experimental plots sown with different oat cultivars and lines. Symptoms of the fusarium panicle blight developed on 0.5-15% of oat plants. Results of this studies showed that fusarium blight of oat panicles is widespraed in Lublin region. Fusarium avenaceum and F. poae proved to be the cause of the disease. Also F. culmorum, F. crookwellense, F. equiseti, F. oxysporum, F. sporotrichioides were isolated from infected panicles.
Badania nad występowaniem fuzariozy wiech owsa prowadzono w latach 1996-1998 w regionie Lubelskim. Procent roślin z objawami chorobowymi wahał się od 0,5-15. Obserwacje polowe roślin wzrastających w naturalnych warunkach uprawy oraz wyniki analizy mikologicznej plew i ziarniaków wskazują, że znaczny udział w powodowaniu fuzariozy wiech owsa mają F. avenaceum i F. poae. Występowanie w każdym roku badań obydwu gatunków w uprawach owsa potwierdza dużą tolerancję tych grzybów na temperaturę i wilgotność. Spośród innych Fusarium spp., z porażonych wiech otrzymywano także F. culmorum, F. crookwellense, F. equiseti, F. oxysporum i F. sporotrichioides.
Źródło:
Journal of Plant Protection Research; 2001, 41, 2
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Note on the core matrix partial ordering
Autorzy:
Mielniczuk, Jacek
Powiązania:
https://bibliotekanauki.pl/articles/729954.pdf
Data publikacji:
2011
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
core inverse
core partial ordering
generalized inverse
group inverse
left star partial ordering
minus partial ordering
Moore-Penrose inverse
right sharp partial ordering
Opis:
Complementing the work of Baksalary and Trenkler [2], we announce some results characterizing the core matrix partial ordering.
Źródło:
Discussiones Mathematicae Probability and Statistics; 2011, 31, 1-2; 71-75
1509-9423
Pojawia się w:
Discussiones Mathematicae Probability and Statistics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pathogenicity of Fusarium crookwellense Burgess, Nelson and Toussoun to 12 genotypes of oat (Avena sativa l.).
Autorzy:
Mielniczuk, Elżbieta
Powiązania:
https://bibliotekanauki.pl/articles/2199152.pdf
Data publikacji:
2008-06-22
Wydawca:
Instytut Hodowli i Aklimatyzacji Roślin
Tematy:
damping off
field experiment inoculation
Fusarium crookwellense
oat genotypes
susceptibility
Opis:
Within the years 2002-2004 12 genotypes of oat (Bachmat, Budrys, Bohun, Chwat, Cwał, Deresz, Hetman, Rajtar, Sam, Szakal, STH 5501, STH 5601) were examined to determine their susceptibility to Fusarium crookwellense. The examination was led under field conditions of Zamość region (south - eastern part of Poland),. Both oat grains and soil were inoculated with Fusarium crookwellense nr 47, what caused a reduction in numbers of seedlings - from 24.6% (cv. Bohun) to 52.9% (cv. Sam); plants before harvest - from 11.6 (cv. Bohun) to 68% (cv. Sam)...
Źródło:
Plant Breeding and Seed Science; 2008, 57; 3-12
1429-3862
2083-599X
Pojawia się w:
Plant Breeding and Seed Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Efficiency of cropping system designs via base contrast
Autorzy:
Bronowicka-Mielniczuk, U.
Mielniczuk, J.
Przybysz, T.
Powiązania:
https://bibliotekanauki.pl/articles/1208129.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
cropping system experiment
inter-contrast
efficiency factor
base contrast
Opis:
The present article is a continuation of previous papers by the same authors devoted to the efficiency of crop rotation experiments. We focus on plans distinguished by the cyclical pattern of the incidence matrix. For practical reasons, we slightly modify the efficiency coefficient. The relation between the resulting efficiency coefficients is examined. In addition, we provide a background material on crop rotation experiments.
Źródło:
Applicationes Mathematicae; 2000, 27, 4; 377-384
1233-7234
Pojawia się w:
Applicationes Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimality of crop rotation designs
Optymalność doświadczeń płodozmianowych
Autorzy:
Bronowicka-Mielniczuk, U.
Powiązania:
https://bibliotekanauki.pl/articles/9725.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Katedra Zastosowań Matematyki i Informatyki
Tematy:
crop rotation
crop test
information matrix
Źródło:
Colloquium Biometricum; 2009, 39
1896-7701
Pojawia się w:
Colloquium Biometricum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance of variance function estimators for autoregressive time series of order one: asymptotic normality and numerical study
Autorzy:
Borkowski, P.
Mielniczuk, J.
Powiązania:
https://bibliotekanauki.pl/articles/206217.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
autoregressive process
bandwidth
heteroscedasticity
integrated squared error
local linear and local maximum likelihood estimator
difference-based estimator
geometric moment contraction
variance function
volatility
Opis:
We study performance of several conditional variance estimators for an autoregressive time series which include local linear smoothers with various bandwidths, local likelihood and difference-based estimators. In the theoretical part, asymptotic normality of the local linear estimator of variance with no mixing assumptions imposed on the underlying process is proved. Moreover, numerical examples performed reveal that a two-stage local linear smoother with a bandwidth, proposed by Ruppert, Sheather and Wand, used to estimate the regression function and a simple rule of thumb bandwidth for variance estimation performs best for variances without much structure, whereas the bandwidth considered by Fan and Yao works very well for much more variable variances.
Źródło:
Control and Cybernetics; 2012, 41, 2; 415-441
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wavelets for time series analysis - a survey and new results
Autorzy:
Mielniczuk, J.
Wojdyłło, P.
Powiązania:
https://bibliotekanauki.pl/articles/970989.pdf
Data publikacji:
2005
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
long-range dependence
decorrelation property
spectral density
time series
wavelets
fractional Gaussian noise (FGN)
fractional autoregressive integrated moving average (FARIMA)
Hurst exponent
falka
Opis:
In the paper we review stochastic properties of wavelet coefficients for time series indexed by continuous or discrete time. The main emphasis is on decorrelation property and its implications for data analysis. Some new properties are developed as the rates of correlation decay for the wavelet coefficients in the case of long-range dependent processes such as the fractional Gaussian noise and the fractional autoregressive integrated moving average processes. It is proved that for such processes the within-scale covariance of the wavelet coefficients at lag k is O(k^2(H-N)-2), where H is the Hurst exponent and N is the number of vanishing moments of the wavelet employed. Some applications of decorrelation property are briefly discussed.
Źródło:
Control and Cybernetics; 2005, 34, 4; 1093-1125
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fusarium head blight of winter rye (Secale cereale L.)
Fuzarioza kłosów żyta ozimego (Secale cereale L.)
Autorzy:
Kiecana, I.
Mielniczuk, E.
Powiązania:
https://bibliotekanauki.pl/articles/26849.pdf
Data publikacji:
2010
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
Fusarium avenaceum
Fusarium culmorum
Fusarium sporotrichioides
head blight
rye
winter rye
Secale cereale
plant disease
fungal disease
Opis:
Investigations on Fusarium head blight of rye were carried out in the years 2005-2007 on 10 production fields in the Lublin region. The percentage of heads showing the fusariosis symptoms in the years 2005-2007 ranged from 0 to 7%. Mycological analysis of kernels and chaff obtained from heads with Fusarium blight (scab) symptoms showed that Fusarium avenaceum, Fusarium culmorum and Fusarium sporotrichioides were the largest threat to heads of this cereal. The species of Fusarium poae and Fusarium crookwellense were also isolated from infected rye heads. The dominance of particular species in infecting rye heads was determined by weather conditions.
Źródło:
Acta Agrobotanica; 2010, 63, 1
0065-0951
2300-357X
Pojawia się w:
Acta Agrobotanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The factorial structure of job-related affective well-being: Polish adaptation of the Warr’s measure
Autorzy:
Mielniczuk, Emilia
Łaguna, Mariola
Powiązania:
https://bibliotekanauki.pl/articles/2159983.pdf
Data publikacji:
2018-07-04
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
mood
employees
turnover intention
circumplex model of affect
job-related affective well-being
longitudinal research
Opis:
Objectives The first aim of the study reported in this article was to test the factorial structure of job-related affect in a Polish sample. The second aim was to develop the Polish adaptation of the Warr’s job-related affective well-being measure published in 1990, which is designed to assess 4 types of affect at work: anxiety, comfort, depression, enthusiasm. Material and methods A longitudinal study design with 2 measurement times was used for verifying the psychometric properties of the Polish version of the measure. The final sample consisted of 254 Polish employees from different professions. Participants were asked to fill in a set of questionnaires consisting of measures capturing job-related affective well-being, mood, and turnover intention. Results The first step of analysis was to test the theoretically-based structure of the job-related affective well-being measure in a Polish sample. The confirmatory factor analysis revealed that a 4-factor model best describes the structure of the measure in comparison to 5 alternative models. Next, reliability of this measure was assessed. All scales achieved good internal consistency and acceptable test-retest reliability after 2 weeks. Finally, the convergent and discriminant validity as well as the criterion and predictive validity of all job-related affective well-being scales was confirmed, based on correlations between job-related affect and mood as well as turnover intention. Conclusions The results suggest that the Polish adaptation of Warr’s job-related affective well-being measure can be used by scientists as well as by practitioners who aim at assessing 4 types of affective well-being at a work context. Int J Occup Med Environ Health 2018;31(4):429–443
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2018, 31, 4; 429-443
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fungi infected the Zinnia elegans Jacq. concerning susceptibility of cultivars to selected pathogens
Grzyby porażające cynię wytworną (Zinnia elegans Jacq.) z uwzględnieniem podatności odmian na wybrane patogeny
Autorzy:
Kiecana, I.
Mielniczuk, E.
Powiązania:
https://bibliotekanauki.pl/articles/11541933.pdf
Data publikacji:
2010
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Tematy:
fungi
plant infection
fungal infection
Zinnia elegans
healthiness
seedling
pathogenicity
Fusarium
Botrytis cinerea
Sclerotinia sclerotiorum
plant cultivar
susceptibility
pathogen
Opis:
Zinnia elegans is an annual plant recommended for cultivation for cut flowers as well as flowerbeds. This ornamental plant can be infected by: viruses, bacteria, phytoplasms and by a number of fungi species. Presented studies were conducted in 2006 in three localities of the Lublin region: in the vicinity of Zamość, near Krasnystaw and near Opole Lubelskie. Those studies included three cultivars of Zinnia elegans Jacq.: Golden Dawn, Lawa, Scarlet Flame as well as the mixed material of the cultivars belonging to the dahlia group. Six weeks after the sowing, the seedling’s healthiness was assessed. The proportion of seedlings with disease symptoms ranged from 7% to 44%. The main cause of root infection at the seedling stage proved to be the species of F. equiseti and S. sclerotiorum. Considerable amounts of B. cinerea and F. culmorum and A. alternata were also detected from diseased seedlings. Studies on the susceptibility of analyzed cultivars and the mixed material of elegans zinnia to infection by B. cinerea and F. avenaceum F. culmorum and F. equiseti were conducted in a growth chamber. Results obtained from this experiment confirmed considerable harmfulness of the species B. cinera and F. equiseti towards the seedlings of elegans zinnia, which can be reduced introducing less susceptible varieties to the cultivation. However, none of the studied varieties of elegans zinnia, only its mixed material, showed such properties.
Zinnia elegans polecana jest głównie do uprawy na kwiat cięty oraz na rabatach. Ta roślina ozdobna porażana jest przez: wirusy, bakterie, fitoplazmy i różne gatunki grzybów. Prezentowane badania przeprowadzono w 2006 r. w trzech lokalizacjach woj. lubelskiego: w okolicach Zamościa, w okolicach Krasnegostawu i w okolicach Opola Lubelskiego. Objęto nimi 3 odmiany cynii wytwornej (Golden Dawn, Lawa, Scarlet Flame) należące do grupy daliowatych oraz materiał mieszany odmian. Po 6 tygodniach od wysiewu przeprowadzono ocenę zdrowotności siewek. Udział siewek z objawami chorobowymi wahał się od 7 do 44%. Główną przyczyną porażenia korzeni w stadium siewki okazały się gatunki F. equiseti i S. sclerotiorum. Z chorych siewek w znacznych ilościach uzyskiwano także B. cinerea i F. culmorum oraz A. alternata. Badania podatności siewek analizowanych odmian i materiału mieszanego cynii wytwornej na porażenie przez B. cinerea oraz F. avenaceum, F. culmorum i F. equiseti przeprowadzono w fitotronie. Uzyskane wyniki potwierdziły szczególnie dużą szkodliwość dla siewek cynii wytwornej gatunków B. cinera i F. equiseti, którą można zmniejszyć wprowadzając do uprawy odmiany mniej podatne, jednak takiej właściwości nie wykazywała żadna z badanych odmian cynii wytwornej, jedynie materiał mieszany odmian.
Źródło:
Acta Scientiarum Polonorum. Hortorum Cultus; 2010, 09, 3; 147-160
1644-0692
Pojawia się w:
Acta Scientiarum Polonorum. Hortorum Cultus
Dostawca treści:
Biblioteka Nauki
Artykuł

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