Temat: Net - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Fuzzy global sensitivity analysis of fuzzy net present value
Autorzy:: Sari, I. D.
Kuchta, D.
Powiązania:: https://bibliotekanauki.pl/articles/206340.pdf
Data publikacji:: 2012
Wydawca:: Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:: fuzzy sensitivity analysis
fuzzy net present value
Opis:: The cash flows of an investment project are influenced by several factors. All the factors influencing fuzzy net present value of a project should be taken into account, together with their variability, in order to analyze the whole project, and to make the best decisions during the project’s life. In this paper a fuzzy global sensitivity analysis method is proposed for fuzzy net present value to determine the influences of the factors on the worth of an investment project. The results of the proposed method for an application are also interpreted.
Źródło:: Control and Cybernetics; 2012, 41, 2; 481-496
0324-8569
Pojawia się w:: Control and Cybernetics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: DP2PN2Solver: A flexible dynamic programming solver software tool
Autorzy:: Mauch, H.
Powiązania:: https://bibliotekanauki.pl/articles/970851.pdf
Data publikacji:: 2006
Wydawca:: Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:: sieć Bellmana
model sieci Petri
programowanie dynamiczne
Bellman net
dynamic programming
matrix chain multiplication problem
optimization software
Petri net model
traveling salesman problem
Opis:: Dynamic programming (DP) is a very general optimization technique, which can be applied to numerous decision problems that typically require a sequence of decisions to be made. The solver software DP2PN2Solver presented in this paper is a general, flexible, and expandable software tool that solves DP problems. It consists of modules on two levels. A level one module takes the specification of a discrete DP problem instance as input and produces an intermediate Petri net (PN) representation called Bellman net (Lew, 2002; Lew, Mauch, 2003, 2004) as output - a middle layer, which concisely captures all the essential elements of a DP problem in a standardized and mathematically precise fashion. The optimal solution for the problem instance is computed by an "executable" code (e.g. Java, Spreadsheet, etc.) derived by a level two module from the Bellman net representation. DP2PN2Solver's unique potential lies in its Bellman net representation. In theory, a PN's intrinsic concurrency allows to distribute the computational load encountered when solving a single DP problem instance to several computational units.
Źródło:: Control and Cybernetics; 2006, 35, 3; 687-702
0324-8569
Pojawia się w:: Control and Cybernetics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: A fuzzy neural network for knowledge acquisition in complex time series
Autorzy:: Kasabov, N.
Kim, J.
Kozma, R.
Powiązania:: https://bibliotekanauki.pl/articles/205889.pdf
Data publikacji:: 1998
Wydawca:: Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:: logika rozmyta
sieć neuronowa rozmyta
układ dynamiczny
adaptation
computational neural net
fuzzy logic
fuzzy neural net
knowledge acquisition
time-series and dynamical system
Opis:: A novel fuzzy neural network, called FuNN, is applied here for time-series modeling. FuNN models have several features that make them well suited to a wide range of knowledge engineering applications. These strengths include fast and accurate learning, good generalisation capabilities, excellent explanation facilities in the form of semantically meaningful fuzzy rules, and the ability to accomodate both numerical data and existing expert knowledge about the problem under consideration. We investigate the effectiveness of the proposed neuro-fuzzy hybrid architectures for manipulating the future behaviour of nonlinear dynamical systems and interpreting fuzzy if-then rules. A well-known example of Box and Jenkins is used as a benchmark time series in the proposed modelling approach and the other modelling approach. Finally, experimental results and comparisons with the other popular neuro-fuzzy inference system, namely Adaptive Network-based Fuzzy Inference System (ANFIS) are also presented.
Źródło:: Control and Cybernetics; 1998, 27, 4; 593-611
0324-8569
Pojawia się w:: Control and Cybernetics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Formal modelling of IEC 61499 function blocks with integer-valued data types
Autorzy:: Gerber, C.
Ivanova-Vasileva, I.
Hanisch, H. M.
Powiązania:: https://bibliotekanauki.pl/articles/971024.pdf
Data publikacji:: 2010
Wydawca:: Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:: modelling
verification
net condition/event systems
IEC 61499
closed-loop behaviour
Opis:: During the last couple of years a lot of component- or object-oriented approaches have been presented to ease the implementation and reconfiguration of distributed control systems. Using these frameworks, the structure of the control objects follows the configuration of the mechanical components, and each object is instantiated as often as the corresponding device occurs in a plant. Having an object library, a control engineer will glue objects together, which means, in the context of the IEC 61499, connecting function blocks by event and data connections. This rapid way of implementation and reconfiguration makes also high demands on the verification process, which has to be done after each change. This means that the model of the plant has to be updated and the model of the distributed controllers have to be automatically generated to connect both in a closed loop. Both formal models should be modular to manage even large systems. Furthermore, the controller must be able to interact with the plant not only via Boolean data but via integer-valued data as well. Thus, the existing verification approaches have to be extended and an execution and a data processing model defined. The execution model includes the function block interface and the Execution Control Chart as well as their interconnections. For the arithmetical operations of adding and subtracting as well as the comparison of Boolean and integer-valued data it is shown how the data processing inside the function blocks has to be transformed to the formal model. Consequently, rules are defined for the transformation of the execution and data processing of function blocks with Boolean and integer-valued data. Due to the proposed separation, the resulting data processing model is not limited to IEC 61499 Basic Function Blocks. As formal model, Net Condition/Event modules (NCEM) and structures are used. Modelling of the plant and the analysis of the resulting closed-loop behaviour are presented using a small, but realistic manufacturing system.
Źródło:: Control and Cybernetics; 2010, 39, 1; 197-231
0324-8569
Pojawia się w:: Control and Cybernetics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Stability analysis of fuzzy controll systems simplified as a discrete system
Autorzy:: Hasegawa, T.
Furuhashi, T.
Powiązania:: https://bibliotekanauki.pl/articles/206083.pdf
Data publikacji:: 1998
Wydawca:: Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:: analiza stabilności
sieć Petriego
sterowanie rozmyte
fuzzy control
Petri net
stability analysis
Opis:: Fuzzy controls can describe control rules using fuzzy if-then rules and it can incorporate experts' control rules. It is, however, difficult to guarantee the stability of fuzzy control system. This paper presents a new method for stability analysis of fuzzy control system using petri nets. The proposed method crisply divides all of the input and output variables of the fuzzy controller and the fuzzy model of the controlled object. This crisp division makes the fired rules of the fuzzy controller and the fuzzy model, which have truth values greater then 0, be single each. These simplified fuzzy rules can be considered as discrete description of the controller and the controlled object. By approximating and the fuzzy control system as this discrete system, the system can be expressed by the petri nets. The proposed method describes the fuzzy control system using matrix based on a bipartite directed multigraph of the petri net, thereby enables to analyse the stability of the fuzzy control system. The analytic results using the petri nets have clear correspondence to the fired fuzzy rules. The dynamical behavior of the system are able to be understood easily. Simulation is done to verify the proposed stability analysis method.
Źródło:: Control and Cybernetics; 1998, 27, 4; 565-577
0324-8569
Pojawia się w:: Control and Cybernetics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Time Petri nets state space reduction using dynamic programming
Autorzy:: Popova-Zeugmann, L.
Powiązania:: https://bibliotekanauki.pl/articles/970865.pdf
Data publikacji:: 2006
Wydawca:: Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:: programowanie dynamiczne
time Petri net
dynamic programming
state space reduction
integer state
reachability graph
Opis:: In this paper a parametric description for the state space of an arbitrary TPN is given. An enumerative procedure for reducing the state space is introduced. The reduction is defined as a truncated multistage decision problem and solved recursively. A reachability graph is denned in a discrete way by using the reachable integer-states of the TPN.
Źródło:: Control and Cybernetics; 2006, 35, 3; 721-748
0324-8569
Pojawia się w:: Control and Cybernetics
Dostawca treści:: Biblioteka Nauki

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