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    Wyświetlanie 1-12 z 12
    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:
    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:
    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:
    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:
    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:
    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:
    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:
    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:
    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:
    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:
    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:
    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
      Wyświetlanie 1-12 z 12

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