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システム/制御/情報 Vol. 36 (2023), No. 6

ISIJ International
belloff
オンライン版ISSN: 2185-811X
冊子版ISSN: 1342-5668
発行機関: THE INSTITUTE OF SYSTEMS, CONTROL AND INFORMATION ENGINEERS (ISCIE)

Backnumber

  1. Vol. 37 (2024)

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  2. Vol. 36 (2023)

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  3. Vol. 35 (2022)

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  4. Vol. 34 (2021)

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  5. Vol. 33 (2020)

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  6. Vol. 32 (2019)

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  7. Vol. 31 (2018)

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  8. Vol. 30 (2017)

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  9. Vol. 29 (2016)

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  14. Vol. 24 (2011)

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  18. Vol. 20 (2007)

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  19. Vol. 19 (2006)

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  20. Vol. 18 (2005)

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  21. Vol. 17 (2004)

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  22. Vol. 16 (2003)

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  23. Vol. 15 (2002)

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  24. Vol. 14 (2001)

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  25. Vol. 13 (2000)

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  26. Vol. 12 (1999)

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  27. Vol. 11 (1998)

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  28. Vol. 10 (1997)

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  29. Vol. 9 (1996)

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  30. Vol. 8 (1995)

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  31. Vol. 7 (1994)

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  32. Vol. 6 (1993)

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  33. Vol. 5 (1992)

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  34. Vol. 4 (1991)

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  35. Vol. 3 (1990)

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  36. Vol. 2 (1989)

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  37. Vol. 1 (1988)

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キーワードランキング

21 Nov. (Last 30 Days)

システム/制御/情報 Vol. 36 (2023), No. 6

A Unique Bifurcation Structure in One-Dimensional Model of Current-Controlled Step-Up DC–DC Converter with Photovoltaic Module

Shota Uchino, Satoshi Aoki, Takuji Kousaka, Hiroyuki Asahara

pp. 155-162

DOI:

10.5687/iscie.36.155

抄録

In this study, the first step we investigate the bifurcation phenomenon in a current-controlled step-up DC–DC converter with photovoltaic (PV) module using a one-dimensional circuit model. Specifically, we analyze the occurrence of the bifurcation phenomenon in this circuit model by defining the output voltage of the converter as constant and utilizing a PV module nonlinear output model with a relatively small number of parameters. Our results reveal the existence of a unique bifurcation structure in DC–DC converters with PV module, which has not been previously reported. We further elucidate the mechanism of occurrence through a stability analysis based on the brute-force method. The findings of this study contribute significantly to the development of circuit and bifurcation theory for current-controlled step-up DC–DC converters with PV module.

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Comparison of Norm Minimizations in Scenario Approach and Its Application to Robust Optimal Control

Tomoyuki Iori, Yasumasa Fujisaki

pp. 163-171

DOI:

10.5687/iscie.36.163

抄録

In this paper, we investigate the effect of norm selection in the scenario approach to robust feasibility problems. A robust feasibility problem can be converted into a robust optimization problem by minimizing a fictitious cost function, and the scenario approach is a method to find a stochastic approximation of the optimal solution in an affordable computational time. When considering a norm of the decision variable as the fictitious cost function, the choice of the norm may affect the robustness of the solution obtained by the scenario approach. To demonstrate the effect of norm selection, we compare the 2-, ∞-, and 1-norms by simulating two illustrative examples. Moreover, the effectiveness of the ∞- and 1-norms compared to the 2-norm is demonstrated in a numerical example of a finite-horizon optimal control of uncertain linear systems.

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数理計画法とメタヒューリスティクスのハイブリッド型最適化によるローリング・スケジューリング

榊原 一紀, 中田 康祐, 松﨑 仁平, 中村 正樹

pp. 172-178

DOI:

10.5687/iscie.36.172

抄録

This paper addresses the scheduling of an operator and a machine in the machining process. While both schedules are reduced to the job-shop type, the operator's completion time is relatively uncertain, so rolling scheduling is required. For problems with these characteristics, we apply relax-and-fix heuristics, in which some decision variables in each rolling are relaxed based on a mixed-integer programming model. Although the relax-and-fix heuristics can reduce the solution cost by mathematical programming, it may significantly reduce the optimality of the derived solution, depending on how the set of variables to be relaxed is selected. Therefore, we incorporate metaheuristics into the relax-and-fix heuristics to always choose the appropriate relaxation variables. The effectiveness of the proposed method is confirmed by applying it to real-world machining scheduling.

mendeley

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数理計画法とメタヒューリスティクスのハイブリッド型最適化によるローリング・スケジューリング

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mendeley

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