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Wyszukujesz frazę "Hasegawa, T." wg kryterium: Autor

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    Wyświetlanie 1-5 z 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
    Artykuł
    Tytuł:
    Electronic Phase Transition in Layered Materials 1T-TaS$\text{}_{x}$Se$\text{}_{2-x}$ Probed by Cryogenic STM/STS
    Autorzy:
    Hasegawa, T.
    Shiino, O.
    Yamaguchi, W.
    Endo, T.
    Sugawara, H.
    Kitazawa, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968713.pdf
    Data publikacji:
    1998-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.30.+h
    71.20.-b
    Opis:
    A metal-insulator transition, Mott transition, in layered materials 1T-TaS$\text{}_{x}$Se$\text{}_{2-x}$ was investigated by cryogenic scanning tunneling microscopy/ spectroscopy. At 77 K, tunneling spectra in the insulating phase showed a conduction band with almost half filling, which becomes narrower as x decreases. Around the transition point x≈1.4 at 77 K, we observed a sign of gap opening without an overshooting peak at zero bias, supporting the Mott localization picture in which a carrier number vanishes at the transition point. From the site-specified scanning tunneling spectroscopy measurements, furthermore, electrons were found to localize at the charge density wave crest positions. In 1T-TaS$\text{}_{2}$, we have also found that both metallic and insulating phases coexist in a nanometer scale just above the transition temperature, 180 K. >From the minimum size of the insulating region, the coherence length of Mott insulating state was evaluated to be≈5 nm.
    Źródło:
    Acta Physica Polonica A; 1998, 93, 2; 297-305
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Exponential and chaotic neurodynamical tabu searches for quadratic assignment problems
    Autorzy:
    Hasegawa, M.
    Ikeguchi, T.
    Aihara, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/206864.pdf
    Data publikacji:
    2000
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    problem optymalizacji kombinatorycznej
    sieć neuronowa
    chaos
    combinatorial optimization problems
    neural networks
    quadratic assignment problems
    tabu search
    Opis:
    We propose a chaotic neurodynamical searching method for the Quadratic Assignment Problems (QAPs). First, we construct a neural network whose behavior is the same as that of the conventional tabu search. Using the dynamics of the tabu search neural network, we realize the exponential tabu search, whose tabu effect decreases exponentially with time, and we show the effectiveness of this type of exponential tabu search. Next, we extend this novel tabu search to a chaotic version. This chaotic method includes both effects of the chaotic dynamical search and the exponential tabu search, and exhibits better performance than the conventional and exponential tabu searches. Last, we propose an automatic parameter tuning method and show that the proposed method exhibits high performance even on large QAPs.
    Źródło:
    Control and Cybernetics; 2000, 29, 3; 773-788
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimization using chaotic neural network and its application to lighting design
    Autorzy:
    Nanba, R.
    Hasegawa, M.
    Nishita, T.
    Aihara, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/205753.pdf
    Data publikacji:
    2002
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    algorytm genetyczny
    denaturacja symulowana
    grafika komputerowa
    metoda energetyczna
    model świetlny
    sieć neuronowa chaotyczna
    zagadnienie optymalizacji kombinatorycznej
    chaotic neural networks
    combinatorial optimization problem
    computer graphics
    genetic algorithm
    lighting design
    radiosity method
    simulated annealing
    Opis:
    We have developed a chaotic neurodynamical searching method for solving the lighting design problems. The goal of this method is to design interior lighting that satisfies required illuminance distribution. We can obtain accurate illuminance distribution by using the radiosity method to calculate interreflection of lights. We formulate the lighting design problem that considers the interreflection of lights as a combinatorial optimization problem, and construct a chaotic neural network which searches the optimum solution of the lighting design problem. The calculated illuminance distribution is visualized using computer graphics. We compare this optimization method with the conventional neural network with gradient dynamics, simulated annealing, and the genetic algorithm, and clarify the effectiveness of the proposed method based on the chaotic neural network.
    Źródło:
    Control and Cybernetics; 2002, 31, 2; 249-269
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    STM/STS Studies of the Structural Phase Transition in the Growth of Ultra-Thin Bi Films on Si(111)
    Autorzy:
    Sadowski, J. T.
    Nagao, T.
    Saito, M.
    Oreshkin, A.
    Yaginuma, S.
    Hasegawa, S.
    Ohno, T.
    Sakurai, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2036956.pdf
    Data publikacji:
    2003
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.37.Ef
    68.47.De
    68.55.Ac
    Opis:
    Growth of thin metal films on semiconductors has been always an important subject for extensive experimental and theoretical studies. As the applicability of well-ordered nanostructures in electronic applications depends strongly on their size and distribution, it is necessary to understand the processes that govern the growth of such structures. In this paper we present the results of investigation of the room temperature growth of thin Bi film on Si(111). In our study we clarified that rotationally disordered, pseudo-cubic Bi(012) islands with uniform height of ≈13Å are formed in the initial stage of Bi film growth. With increase in the amount of bismuth on the surface, islands interconnect maintaining however their uniform height. This process is further accompanied by the unique and unexpected structural phase transition of the Bi(012) film into a hexagonal Bi(001) film.
    Źródło:
    Acta Physica Polonica A; 2003, 104, 3-4; 381-387
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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