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Wyszukujesz frazę "L-systems" wg kryterium: Temat


Wyświetlanie 1-13 z 13
Tytuł:
Procedural generation of underground systems with terrain features using schematic maps and L-systems
Autorzy:
Antoniuk, I.
Rokita, P.
Powiązania:
https://bibliotekanauki.pl/articles/115839.pdf
Data publikacji:
2016
Wydawca:
Fundacja na Rzecz Młodych Naukowców
Tematy:
computer games
L-systems
procedural content generation
gry komputerowe
L-system
proceduralne generowanie zawartości
algorytmy
Opis:
This article describes an algorithm for procedural generation of underground systems with terrain features, by processing set of schematic maps. L-system and cellular automata are used to generate final system shapes. Most of existing algorithms are not suitable for application in computer games, since they usually lack any considerable level of control, require large amount of computation or produce overly complex meshes. We present our solution, that can produce editable 3D objects from very simple input, with high level of control over final system layout. We also allow evaluation at every key step of generation process. Presented approach incorporates placement of various terrain features with stalactites, stalagmites and columns as an example of such elements. Obtained results can be used in computer games or similar applications.
Źródło:
Challenges of Modern Technology; 2016, 7, 3; 8-15
2082-2863
2353-4419
Pojawia się w:
Challenges of Modern Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Further exploring the dynamicity, situatedness, and emergence of the self: The key role of context
Autorzy:
Serafini, Ellen J.
Powiązania:
https://bibliotekanauki.pl/articles/780848.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
complex dynamic systems
L2 motivation
L2 self
learning context
Opis:
Drawing on theoretical insights from a complex dynamic systems framework, this work explores the ways that learner selves, as they relate to learning and using languages, manifest across different contexts and timescales and emerge in interaction with various factors. First, a broad overview of dynamically-oriented L2 motivation research is provided before critically considering the need for research that aligns with conceptual advances made under the dynamic turn in SLA. In particular, this critical overview highlights a crucial need for more research employing dynamic methods capable of revealing how learner perceptions of self emerge in relation to their interlocutors and in interaction with external factors, including language ideologies that may uniquely characterize sociocultural contexts where target languages other than English are learned. The chapter concludes by discussing ways to implement dynamically oriented methodology that can provide much needed insights into the inherent dynamic, emergent, and contextually and socially embedded nature of learner selves.
Źródło:
Studies in Second Language Learning and Teaching; 2020, 10, 1; 133-157
2083-5205
2084-1965
Pojawia się w:
Studies in Second Language Learning and Teaching
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new nonlinear L-stable scheme with constant and adaptive step-size strategy
Autorzy:
Arain, Sadia
Qureshi, Sania
Shaikh, Asif Ali
Powiązania:
https://bibliotekanauki.pl/articles/2175496.pdf
Data publikacji:
2021
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
stiff systems
singular systems
L-stability
local error
order stars
systemy sztywne
układ singularny
stabilność L
błąd lokalny
Opis:
The present study proposes a new explicit nonlinear scheme that solves stiff and nonlinear initial value problems in ordinary differential equations. One of the promising features of this scheme is its fourth-order convergence with strong stability having an unbounded region. A modern approach for relative stability growth analysis is also presented under order stars conditions. The scheme is also good in dealing with singular and stiff type of models. Comparing numerical experiments using various errors, including maximum absolute global error over the integration interval, absolute error at the endpoint, average error, norm of errors, and the CPU times (seconds), shows better performance. An adaptive step-size approach seems to increase the performance of the proposed scheme. The numerical simulations assure us of L -stability, consistency, order, and rapid convergence.
Źródło:
Journal of Applied Mathematics and Computational Mechanics; 2021, 20, 4; 7--18
2299-9965
Pojawia się w:
Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fluency and complexity as coupled growers in speaking English at secondary school – A case study of a good, average, and poor language learner
Autorzy:
Rokoszewska, Katarzyna Joanna
Powiązania:
https://bibliotekanauki.pl/articles/1040282.pdf
Data publikacji:
2020-12-30
Wydawca:
Katolicki Uniwersytet Lubelski Jana Pawła II
Tematy:
Complex Dynamic Systems Theory
syntactic and lexical complexity
fluency
L2 speech
secondary school
Opis:
One of the main assumptions of Complex Dynamic Systems Theory (CDST) is that internally complex language subsystems develop non-linearly while entering different kinds of supportive, competitive, conditional, or dual relationships which are characterised by trade-offs caused by learners’ restricted cognitive processing, especially in foreign language speech. The present paper belongs to a short series of articles which examines various aspects of the development of L2 English speech at secondary school on basis of the same longitudinal, exploratory, and corpus-based case study. The aim of this paper is to investigate the dynamics of the relationships between fluency and both syntactic and lexical complexity in the speech of a good, average, and poor language learner at the level of secondary school. Syntactic complexity was investigated in terms of general sentence complexity, subordination, coordination, and nominalisation, whereas lexical complexity was construed in terms of lexical density, sophistication, and variation. In general, the results indicated predominantly supportive relationships between fluency and different measures of syntactic complexity but competitive or dual relationships between fluency and lexical complexity. However, the relationships between the selected variables fluctuated over time and often differed in the case of a good, average, and poor language learner.
Źródło:
Linguistics Beyond and Within; 2020, 6; 160-174
2450-5188
Pojawia się w:
Linguistics Beyond and Within
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Iterative-interpolation algorithms for L2 model reduction
Autorzy:
Krajewski, W.
Viaro, U.
Powiązania:
https://bibliotekanauki.pl/articles/970959.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
linear systems
model reduction
output-error minimization
L2 norm
Krylov subspaces
Arnoldi's algorithm
Opis:
This paper is concerned with the construction of reduced-order models for high-order linear systems in such a way that the L2 norm of the impulse-response error is minimized. Two convergent algorithms that draw on previous procedures presented by the same authors, are suggested: one refers to s-domain representations, the other to time-domain state-space representations. The algorithms are based on an iterative scheme that, at any step, satisfies certain interpolation constraints deriving from the optimality conditions. To make the algorithms suitable to the reduction of very large-scale systems, resort is made to Krylov subspaces and Arnoldi's method. The performance of the reduction algorithms is tested on two benchmark examples.
Źródło:
Control and Cybernetics; 2009, 38, 2; 543-554
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Switching controller synthesis for discrete-time switched linear systems with average dwell time
Autorzy:
He, Wei
Xie, Wei
Zhang, Langwen
Powiązania:
https://bibliotekanauki.pl/articles/229372.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
discrete-time switched linear systems
L2 performance
average dwell time
controller state reset
linear matrix inequalities
Opis:
This paper addresses weighted L2 gain performance switching controller design of discrete-time switched linear systems with average dwell time (ADT) scheme. Two kinds of methods, so called linearizing change-of-variables based method and controller variable elimination method, are considered for the output-feedback control with a supervisor enforcing a reset rule at each switching instant are considered respectively. Furthermore, some comparison between these two methods are also given.
Źródło:
Archives of Control Sciences; 2020, 30, 1; 5-22
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical error bound of optimal control for homogeneous linear systems
Autorzy:
Daraghmeh, Adnan
Qatanani, Naji
Powiązania:
https://bibliotekanauki.pl/articles/229410.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
time-invariant systems
quadratic cost function
linear quadratic regulator
algebraic Riccati equation
Hamiltonian function
L2 norm
Opis:
In this article we focus on the balanced truncation linear quadratic regulator (LQR) with constrained states and inputs. For closed-loop, we want to use the LQR to find an optimal control that minimizes the objective function which called "the quadratic cost function” with respect to the constraints on the states and the control input. In order to do that we have used formal asymptotes for the Pontryagin maximum principle (PMP) and we introduce an approach using the so called The Hamiltonian Function and the underlying algebraic Riccati equation. The theoretical results are validated numerically to show that the model order reduction based on open-loop balancing can also give good closed-loop performance.
Źródło:
Archives of Control Sciences; 2019, 29, 2; 323-337
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The relationships between the average semester growth rates of lexical sophistication in L2 English writing at secondary school: A learner corpus analysis
Autorzy:
ROKOSZEWSKA, KATARZYNA
Powiązania:
https://bibliotekanauki.pl/articles/1395907.pdf
Data publikacji:
2021-07-01
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
Complex Dynamic Systems Theory (CDST)
lexical sophistication
the average semester growth rate (ASGR)
L2 English writing, learner corpus
Opis:
In line with Complex Dynamic Systems Theory (CDST), the aim of the paper is to examine dynamics and causality among the growth rates of lexical sophistication in L2 writing development. The study was based on The Written English Developmental Corpus of Polish Learners (WEDCPL) which consists of over 1,900 essays composed during 21 repeated measurements by 100 learners over three years (2014–2017) at secondary school. Lexical sophistication, operationalised as different frequency levels, was analysed with the Lextutor software (Cobb 2014). The results indicated that the learners relied on the first frequency level. The monthly growth rates (MGRs) of the frequency levels were variable but no significant peaks were registered. The relationships between the average semester growth rates (ASGRs) revealed competition between the first and higher frequency levels, and some support between the higher levels. Thus, developing learners’ lexis beyond the first level counteracts the production of lexically unsophisticated texts and supports the use of more advanced words.
Źródło:
Glottodidactica. An International Journal of Applied Linguistics; 2021, 48, 1; 81-102
0072-4769
Pojawia się w:
Glottodidactica. An International Journal of Applied Linguistics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Opracowanie metod modyfikacji struktury bazy danych vmap l2
The elaboration of methods of vmap l2 database structure modification
Autorzy:
Bac-Bronowicz, J.
Kołodziej, A.
Kowalski, P. J.
Olszewski, R.
Powiązania:
https://bibliotekanauki.pl/articles/341307.pdf
Data publikacji:
2007
Wydawca:
Uniwersytet Przyrodniczy we Wrocławiu
Tematy:
infrastruktura danych przestrzennych (SDI)
systemy informacji geograficznej (GIS)
baza danych topograficznych
VMap L2
spatial data infrastructure (SDI)
Geographic Information Systems (GIS)
topographic database
Opis:
W państwowym zasobie geodezyjno-kartograficznym znajdują się następujące bazy danych przestrzennych: Baza Danych Ogólnogeograficznych, VMap L2, Vmap L3 oraz Baza Danych Topograficznych. Tylko jedna z tych baz - VMap L2 może obecnie odgrywać rolę bazy referencyjnej, ponieważ jest opracowana dla obszaru całego kraju, a ponadto zakres i szczegółowość treści odpowiada klasycznej mapie topograficznej. Jednak praktyczne wykorzystanie danych cyfrowych VMap jest ograniczone ze względu na skomplikowaną strukturę (224 klasy obiektów pogrupowanych w 8 kategorii) oraz brak mechanizmów automatycznej wizualizacji kartograficznej. W artykule przedstawiono propozycję uproszczenia struktury bazy danych VMap L2 dla celów analiz i wizualizacji kartograficznej. Opisano 3 podstawowe metody integracji danych. Przeprowadzone z wykorzystaniem systemów informacji geograficznej eksperymenty umożliwiły wybór jednej z metod: integracji wg kryterium podobieństwa z zachowaniem unikalnych typów geometrycznych. Chociaż baza VMap L2 w strukturze użytkowej nie pozbawiona jest pewnych wad, to spełnia postawione na wstępie założenia.
The state geodesic and cartographic resources include the following spatial databases: General Geographic Database, VMap L2, VMap L3 and Topographic Database. Only one of those databases - the VMap Level 2 base may at present serve as a reference database, since it covers the whole territory of Poland and its scope and level of detail is equivalent to the classical topographic map. Yet, the practical use of the VMap digital data is limited on account of the complex structure (224 feature classes grouped in eight categories) and the lack of automatic cartographic visualisation. This paper presents a proposal of VMap L2 database structure simplification for analyses and visualization purposes. There are three main methods of data integration described. The database modification experiments carried out with the use of GIS software allowed to choose one of them: according to the similarity of object characteristics with geometric type preservation. Although the usable structure of VMap L2 database is not free of drawbacks, it does meet the requirements laid down in the introduction.
Źródło:
Acta Scientiarum Polonorum. Geodesia et Descriptio Terrarum; 2007, 6, 2; 27-39
1644-0668
Pojawia się w:
Acta Scientiarum Polonorum. Geodesia et Descriptio Terrarum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimal control of nonlinear evolution equations
Autorzy:
Papageorgiou, Nikolaos
Yannakakis, Nikolaos
Powiązania:
https://bibliotekanauki.pl/articles/729352.pdf
Data publikacji:
2001
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
evolution triple
compact embedding
monotone operator
pseudomonotone operator
L-generalized pseudomonotonicity
integration by parts
evolution inclusion
saddle point
necessary conditions
adjoint equation
distributed parameter systems
Opis:
In this paper, first we consider parametric control systems driven by nonlinear evolution equations defined on an evolution triple of spaces. The parametres are time-varying probability measures (Young measures) defined on a compact metric space. The appropriate optimization problem is a minimax control problem, in which the system analyst minimizes the maximum cost (risk). Under general hypotheses on the data we establish the existence of optimal controls.
Then we pass to nonparametric systems, which are governed by nonlinear evolution equations with nonmonotone operators. We prove two existence results for such evolution inclusions, which are of independent interest and extend significantly the results existing in the literature. Then we solve time-optimal and Meyer-type optimization problems. In Section 5, we derive necessary conditions for saddle point optimality in the minimax control problem. We conclude the paper with three examples of distributed parameter control systems.
Źródło:
Discussiones Mathematicae, Differential Inclusions, Control and Optimization; 2001, 21, 1; 5-50
1509-9407
Pojawia się w:
Discussiones Mathematicae, Differential Inclusions, Control and Optimization
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Accuracy and complexity as connected growers in L2 English speech at secondary school – a case study of a good, average, and poor language learner
Autorzy:
Rokoszewska, Katarzyna
Powiązania:
https://bibliotekanauki.pl/articles/1036452.pdf
Data publikacji:
2021-03-31
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu. Collegium Novum. Polskie Towarzystwo Neofilologiczne
Tematy:
accuracy
syntactic and lexical complexity
Complex Dynamic Systems Theory
L2 speech
secondary school
poprawność
złożoność syntaktyczna i leksykalna
Teoria Złożonych Systemów Dynamicznych
mowa w J2
szkoła średnia
Opis:
Complex Dynamic Systems Theory (CDST), which originated in the natural sciences, has recently been applied to second language acquisition, underlining the interdisciplinary character of this humanistic discipline. According to this theory, language is a complex dynamic system consisting of subsystems which develop in a non-linear way, forming different kinds of supportive, competitive, or conditional relationships. What is more, these subsystems compete for the learner’s limited resources, which causes trade-offs within and between language subsystems, such as complexity, accuracy, and fluency, especially in speech. The present paper constitutes a part of a short series of articles which present different aspects of the same longitudinal case study on the development of L2 English speech at secondary school. The aim of this paper is to examine the relationships between language accuracy and a number of specific measures of syntactic complexity, i.e. general sentence complexity, subordination, coordination, and nominalisation; as well as lexical complexity, i.e. lexical density, sophistication, and variation, in the case of a good, average, and poor language learner at secondary school. In general, the results showed that the relationships between the selected variables fluctuated over time and often differed in the case of a good, average, and poor language learner.
Źródło:
Neofilolog; 2021, 56/1; 71-90
1429-2173
Pojawia się w:
Neofilolog
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Opracowanie metodyki wizualizacji bazy danych vmap l2 w różnych środowiskach narzędziowych systemów informacji geograficznej
The elaboration of visualisation methods of the vmap l2 database in various gis environments
Autorzy:
Bac-Bronowicz, J.
Berus, T.
Kowalski, P. J.
Olszewski, R.
Powiązania:
https://bibliotekanauki.pl/articles/341227.pdf
Data publikacji:
2007
Wydawca:
Uniwersytet Przyrodniczy we Wrocławiu
Tematy:
infrastruktura danych przestrzennych (SDI)
systemy informacji geograficznej (GIS)
wizualizacja kartograficzna
baza danych topograficznych
VMap L2
mapy topograficzne
spatial data infrastructure (SDI)
Geographic Information Systems (GIS)
cartographic visualization
topographic database
topographic maps
Opis:
Nadrzędnym celem opracowania uniwersalnych metod wizualizacji danych VMap było uzyskanie czytelnej, zrozumiałej kompozycji kartograficznej, którą użytkownik mógłby odtworzyć na dowolnym fragmencie bazy danych Vmap L2 w strukturze użytkowej niezależnie od oprogramowania, jakiego używa. Zakładając, że głównym odbiorcą produktu będą firmy geodezyjne i kartograficzne, wybrano trzy najpopularniejsze programy wiodących na rynku geoinformacji producentów: ArcGIS firmy ESRI, GeoMedia firmy Intergraph i MapInfo Professional. Przyjęto szereg założeń wstępnych, które miały stanowić o uniwersalności i funkcjonalności zaproponowanych rozwiązań. Ostateczna prezentacja kartograficzna powinna spełniać warunek czytelności, jednoznaczności i wymierności zarówno na ekranie, jak i na szybkich wydrukach z systemu. Opracowane sposoby wizualizacji pozwolą na upowszechnienie i szersze wykorzystanie danych VMap L2 w środowisku programów typu GIS.
The primary goal of the elaboration of universal visualisation methods of VMap data was to obtain a readable and understandable cartographic composition, which might be reproduced by the user on any fragment of the Vmap L2 database in the usable structure independently of the software used. Assuming that geodesic and cartographic companies will be the main recipients of the product, the authors chose the three most popular programmes of leading producers on the geoinformation market: ArcGIS by ESRI, GeoMedia by Intergraph and MapInfo Professional. Several preliminary assumptions were made, aiming at the universality and functionality of proposed solutions. The final cartographic presentation should fulfil the condition of readability, unequivocality and measurability both on the screen and in quick prints from the system. The drawn up methods of visualisation will enable the promotion and more extensive use of VMap L2 data in the GIS environment.
Źródło:
Acta Scientiarum Polonorum. Geodesia et Descriptio Terrarum; 2007, 6, 3; 27-40
1644-0668
Pojawia się w:
Acta Scientiarum Polonorum. Geodesia et Descriptio Terrarum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The correlations between the average semester growth rates of syntactic and lexical complexity in L2 writing development at secondary school
Autorzy:
Rokoszewska, Katarzyna
Powiązania:
https://bibliotekanauki.pl/articles/52446728.pdf
Data publikacji:
2024
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu. Collegium Novum. Polskie Towarzystwo Neofilologiczne
Tematy:
Teoria Złożonych Systemów Dynamicznych
złożoność syntaktyczna
złożoność leksykalna
średnie semestralne tempo wzrostu
podłużny korpus ucznia
pisanie w J2
szkoła średnia
Complex Dynamic Systems Theory (CDST)
syntactic complexity
lexical complexity
rage semester growth rate (ASGR)
longitudinal learner corpus
L2 writing
Polish upper secondary school, the sixth form college
Opis:
The article is devoted to the development of language complexity in a relatively under-researched area of adolescent writing from the point of view of Complex Dynamic Systems Theory (CDST). It describes the second part of a panel study which aimed to examine the relationships among the average semester growth rates (ASGRs) of specific measures of syntactic and lexical complexity within and between these two subsystems in writing in English as a foreign language at the secondary school level. The study involved the analysis of The Written English Developmental Corpus of Polish Learners (WEDCPL). The corpus, which comprises over 1900 essays, was created on the basis of 21 repeated measurements conducted in a group of 100 secondary school learners during a period of three years. With respect to the specific measures of syntactic and lexical complexity, the study indicated that nominalization developed faster than subordination and coordination, and that lexical variation developed faster than lexical density and sophistication per semester. Moreover, the relationships between the ASGRs of both syntactic and lexical measures were more supportive within than between the subsystems. The main pedagogical implication for English language teachers refers to fostering more coordinated development of language complexity at secondary school in the EFL context.
Źródło:
Neofilolog; 2024, 63/1; 156-177
1429-2173
Pojawia się w:
Neofilolog
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-13 z 13

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