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Transactions of the Institute of Systems, Control and Information Engineers Vol. 21 (2008), No. 11

ISIJ International
belloff
ONLINE ISSN: 2185-811X
PRINT ISSN: 1342-5668
Publisher: THE INSTITUTE OF SYSTEMS, CONTROL AND INFORMATION ENGINEERS (ISCIE)

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  1. Vol. 37 (2024)

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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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  11. Vol. 27 (2014)

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  12. Vol. 26 (2013)

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  14. Vol. 24 (2011)

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  16. Vol. 22 (2009)

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  17. Vol. 21 (2008)

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  18. Vol. 20 (2007)

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  19. Vol. 19 (2006)

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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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Transactions of the Institute of Systems, Control and Information Engineers Vol. 21 (2008), No. 11

A Study on Dynamical Interaction Characteristics of Cell Units and Design Parameters in Coupled Redox Flow Battery System

Minghua LI, Takashi HIKIHARA

pp. 343-348

DOI:

10.5687/iscie.21.343

Abstract

A power supply with high voltage and large current is used to be achieved by connecting several batteries in series or parallel. In this paper, a model of coupled redox flow (RF) batteries is derived based on chemical reaction. The model clearly shows the influences of imbalance of battery's unit. The numerical discussion leads us to dynamic design of the redox flow batteries.

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A Study on Dynamical Interaction Characteristics of Cell Units and Design Parameters in Coupled Redox Flow Battery System

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Ris

Image Enlargement Method by a Quadratic Interpolation Kernel with Variable Parameters

Yasunori SUGITA, Ryo ISOBE, Toshinori YOSHIKAWA, Naoyuki AIKAWA

pp. 349-357

DOI:

10.5687/iscie.21.349

Abstract

This paper presents a quadratic kernel with four variable parameters for image enlargement. The proposed kernel can generate peak and valley information of the signals by considering the characteristics of the image and by changing these parameters. Moreover, as the proposed kernel is the extension of the linear interpolation and the nearest-neighbor interpolation, the forms of the proposed kernel are also used selectively depending on the characteristics of signal points which are used for parameter estimation. The various standard images are enlarged using the proposed kernel, and the performance of the proposed kernel is evaluated with MSE of the enlarged images. It has been shown that the performance of the proposed kernel is better than the other methods, such as the cubic interpolations that are often used in image processing.

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Image Enlargement Method by a Quadratic Interpolation Kernel with Variable Parameters

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Transferring Method to Generation-based Funding Scheme in Public Pension Planning

Daisuke BANJO, Hiroyuki TAMURA, Tadahiko MURATA

pp. 358-367

DOI:

10.5687/iscie.21.358

Abstract

In this paper, we propose transferring methods from the present pay-as-you-go scheme to a generation-based funding scheme. We make a mathematical model for the public pension system consisting of national pension, employee pension and mutual pension. Simulating the mathematical model the necessary government contribution is evaluated for the case with or without transferring to the generation-based funding scheme where we take into account the demographic structural change and the variation in economic situation.

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Transferring Method to Generation-based Funding Scheme in Public Pension Planning

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Voltage Instability Analysis via Hybrid System Reachability

Yoshihiko SUSUKI, Takashi HIKIHARA

pp. 368-376

DOI:

10.5687/iscie.21.368

Abstract

Analysis of voltage instability of power systems is of basic importance for prevention of cascading outages and large blackouts. We propose to use reachability analysis of hybrid automaton for voltage instability analysis of power systems. Hybrid automaton is a well-known mathematical model of hybrid systems. Reachability analysis is performed by computing forward or backward reach sets for unsafe sets of a hybrid automaton. The automaton can represent the interaction between continuous voltage oscillation and discrete control of power equipments. The unsafe sets are also subsets of state space in which system voltages show unacceptable levels such as low or high values. For single machine-load bus (SMLB) system with controlled route switching, we show that computation of backward reach sets of hybrid automaton makes it possible to determine voltage instability in the SMLB system. The obtained result implies that voltage instability leading to cascading outages can be detected before its occurrence.

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Voltage Instability Analysis via Hybrid System Reachability

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