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Transactions of the Institute of Systems, Control and Information Engineers Vol. 26 (2013), No. 5

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

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Transactions of the Institute of Systems, Control and Information Engineers Vol. 26 (2013), No. 5

Temperature-aware Frequency Assignment for MP-SoC using Potential Games

Takafumi Kanazawa, Tomoya Ando, Toshimitsu Ushio, Sasinee Pruekprasert

pp. 147-155

Abstract

Recently, an architecture called multiprocessor system-on-a-chip (MP-SoC) is paid much attention to. MP-SoC is composed of several processing elements (PEs) interconnected with a network-on-a-chip. It is important for MP-SoC not only to reduce the computational time of the executed task but also to avoid the rise of the temperature. In this paper, we formulate an optimization problem of clock frequencies of PEs where an objective function evaluates both the computational time and the temperature of MP-SoC. We transform the optimization problem into a potential game and propose a distributed algorithm named a round-robin update algorithm for optimizing the frequencies of PEs. By using simulations, we also compare the proposed algorithm with an existing algorithm and show advantages of the proposed algorithm.

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Temperature-aware Frequency Assignment for MP-SoC using Potential Games

Constrained Control Over Network by Index Feedback and Experimental Verification

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Demonstrating the Effectiveness of Robust Performance Synthesis Based on Noncausal Linear Periodically Time-Varying Scaling through Control Experiments of Cart Inverted Pendulum

Kei Katayama, Yohei Hosoe, Tomomichi Hagiwara

pp. 165-173

Abstract

This paper aims at demonstrating the effectiveness of discrete-time noncausal linear periodically time-varying scaling through control experiments with a cart inverted pendulum whose pendulum length can be set from three different values. We regard the variation in the pendulum length from its middle value as an uncertainty, which leads to a structured uncertainty on the plant model. By applying a robust performance synthesis method based on the above scaling technique to an appropriately constructed generalized plant, we demonstrate that we can successfully design a single linear periodically time-varying controller attaining high control performance regardless of the length of the pendulum.

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Demonstrating the Effectiveness of Robust Performance Synthesis Based on Noncausal Linear Periodically Time-Varying Scaling through Control Experiments of Cart Inverted Pendulum

Nonlinear Reduced Order Modeling of Plasticization Cylinder

Tomonori Sadamoto, Kenji Kashima, Hiroshi Morita, Hiroyuki Mizuno

pp. 174-181

Abstract

In this paper, we construct a nonlinear reduced order model of a plasticization cylinder of injection machines, which has a spatially distributed nonlinear dynamics. First, a distributed parameter model for the overall control system is derived based on the physical laws. Next, we attempt to reduce the model complexity focusing on the specific structure of the nonlinearity, which arises from a temperature-dependency of the rate of heat loss of heaters subjected to natural convection. This enables us to obtain a 28 dimensional model (via an 808 dimensional spatially discretized model) while theoretically guaranteeing a practically satisfactory accuracy. The obtained model is examined experimentally by using a prototype system.

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Nonlinear Reduced Order Modeling of Plasticization Cylinder

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