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Effect of reordering internal messages in MPI broadcast according to the load imbalance

Effect of reordering internal messages in MPI broadcast acco...

2008 International Workshop on Innovative Architecture for Future Generation High Performance Processors and systems, IWIA'08

作者： Soga, Takesi Nanri, Takeshi Kurokawa, Motoyoshi Murakami, Kazuaki Institute of Systems Information Technologies and Nanotechnologies Fukuoka Japan Research Institute for Information Technology Kyushu Univ. Fukuoka Japan Advanced Center for Computing and Communication RIKEN Wako Japan Graduate School of Information Science and Electrical Engineering Kyushu Univ. Fukuoka Japan

ISBN: (纸本)9780769537702

To achieve higher scalability of parallel programs on large scale parallel computers, reducing the time spent for collective communications is one of the most important issue. In this paper, a dynamic optimization method to adjust the implementation of Broadcast operation, one of the most popular collective communications, is introduced. Though there have been many attempts to speed up this operation, they assume that each rank starts this operation at the same time. However, in real execution, the time can be different because of load-imbalance among ranks. This paper first claims that this difference can cause increase of the cost for this operation. Then, as a method to avoid this problem, an optimization method that adjusts the order of point-to-point messages in Broadcast operations is introduced. This method uses the wait time of each rank at the operation to determine the status of load-imbalance. From the results of experiments, it is shown that this optimization method can reduced the time for the operation. In addition to that, it is also shown that the effect of the optimization depends on the size of data to be broadcasted and the amount of load-imbalance. © 3770 IEEE.

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Speech-to-text input method for web system using JavaScript

Speech-to-text input method for web system using JavaScript

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IEEE Spoken Language technology Workshop

作者： Ryuichi Nisimura Jumpei Miyake Hideki Kawahara Toshio Irino Faculty of Systems Engineering Wakayama University Japan Graduate School of Information Science Nara Institute of Science and Technology Japan

We have developed a speech-to-text input method for web systems. The system is provided as a JavaScript library including an Ajax-like mechanism based on a Java applet, CGI programs, and dynamic HTML documents. It allows users to access voice-enabled web pages without requiring special browsers. Web developers can embed it on their web page by inserting only one line in the header field of an HTML document. This study also aims at observing natural spoken interactions in personal environments. We have succeeded in collecting 4,003 inputs during a period of seven months via our public Japanese ASR server. In order to cover out-of-vocabulary words to cope with some proper nouns, a web page to register new words into the language model are developed. As a result, we could obtain an improvement of 0.8% in the recognition accuracy. With regard to the acoustical conditions, an SNR of 25.3 dB was observed.

关键词： Java Speech recognition HTML Web pages System testing Libraries Automatic speech recognition Internet XML Natural languages

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Adaptive gene expression beyond operator-repressor molecular regulatory system

Adaptive gene expression beyond operator-repressor molecular...

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作者： Tsuru, S. Kashiwagi, A. Ying, B.W. Yomo, T. Department of Bioinformatics Engineering Graduate School of Information Science and Technology Osaka University Suita Osaka Japan Graduate School of Frontier Biosciences Osaka University Suita Osaka Japan Complex Systems Biology Project Japan Science and Technology Agency Osaka University Suita Osaka Japan Faculty of Agriculture and Life Sciences Hirosaki University Hirosaki 036-8561 Japan

ISBN: (纸本)9784990288020

In wild nature, living systems obtain various regulatory machineries corresponding to specific environmental changes, during the evolutionary process. These regulatory machineries exhibit the same framework as that of the IF THEN ELSE type of conditional statement in computing system. Repressor-operator molecular regulatory networks, which are the fundamental systems for regulatory gene expression in cells, work similarly as the IF THEN ELSE commands in computational programs. Such regulatory systems work efficiently, when cells encounter the specific environmental changes as programmed in the regulatory networks. However, the IF THEN ELSE type network lose its efficiency against the environmental alterations that out of the programmed regulatory mechanisms. As the space of environmental conditions is much larger than that of cellular response programs, there isn't corresponding program for each condition. To achieve the adaptive response, cells may use other paradigms than the IF THEN ELSE type. Here, we employed an artificial gene expression network in bacterial cells, and observed that the gene expression was auto-regulated adapted to the changing environment, without using the IF THEN ELSE type of regulatory system. The role of such adaptive response of living systems allow us to find a design principle of constructing an auto-regulatory network against unexpected perturbations. ©ISAROB 2008.

关键词： Gene expression

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Two-degree-of-freedom control system for motion control of a flexible stacker crane

Two-Degree-of-freedom control system for motion control of a...

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SICE Annual Conference

作者： Minoru Sasaki Toshimi Shimizu Koji Ikai Satoshi Ito Department of Human and Information Systems Engineering Gifu University Gifu Japan Graduate School of Science and Technology Niigata University Niigata Japan

ISBN: (纸本)9784907764302

This paper presents a motion control of a flexible stacker crane applying a two-degree-of-freedom control. The two-degree-of-freedom control system consists of a feed forward controller based on an inverse system and a feed back controller with suppressing the vibration effectively and stabilizing. Feedback control of the motion of the flexible stacker crane is derived by considering the time rate of change of the total energy of the system. This approach has the advantage over the conventional methods in the respect that it allows one to deal directly with the systempsilas partial differential equations without resorting to approximations. The paper concludes by presenting some numerical results for a special case using a proposed control system.

关键词： Two-degree-of-freedom control system Flexible stacker crane Inverse system Lyapunov's direct method inverse system Motor Control control systems time derivative FLEXIBLE Feedback Controllers ENERGY systems total energy

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Self-Reconfigurable Modular Robot M-TRAN: Distributed Control and Communication 1

Self-Reconfigurable Modular Robot M-TRAN: Distributed Contro...

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1st International Conference on Robot Communication and Coordination, RoboComm 2007

作者： Kurokawa, Haruhisa Tomita, Kohji Kamimura, Akiya Kokaji, Shigeru Hasuo, Takashi Murata, Satoshi Tsukuba Japan Graduate School of Systems and Information Engineering The University of Tsukuba Tsukuba Japan Interdisciplinary Graduate School of Science and Engineering Tokyo Institute of Technology Yokohama Japan

ISBN: (纸本)9789639799080

M-TRAN is a self-reconfigurable modular robot: each module has an independent battery, two-degree-of-freedom motion, six-surface-connection capability, and intelligence with inter-module communication. The M-TRAN system can perform flexible and adaptive locomotion in various configurations using coordination control based on a central pattern generator (CPG). Various structures of several modules can perform metamorphosis, such as that between a four-legged robot and a snake-like one. In addition to these self-reconfigurations with synchronous control, M-TRAN structures having regularity can move using parallel distributed control and message exchange via the network bus. Self-reconfiguration using infrared local communication has been attempted to improve the system’s scalability. Copyright © 2011-2012 ICST

关键词： degrees of freedom (mechanics)

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Force control of 6-DOF pneumatic joystick

Force control of 6-DOF pneumatic joystick

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作者： Moriki, Takashi Tanaka, Yoshito Tanaka, Yutaka Yokomichi, Isao Hitaka, Yasunobu Ishii, Junko Wada, Chikamune Department of Graduate School of Life Science and Systems Engineering Kyushu Institute of Technology Japan Department of Control and Information Systems Engineering Kitakyushu National College of Technology Japan Department of Mechanical Engineering Hosei University Japan

ISBN: (纸本)9784990288013

In this study we develop a new type joystick with force control. A developed joystick consists of a six-degree-of-freedom (6DOF) Stewart platform type(1) of joystick using pneumatic actuated parallel link mechanism. The thrust force of the cylinder is controlled by the PWM of the solenoid valve that uses PIC. When the thrust force of the cylinder is controlled, the control characteristic of the cylinder is improved by the effect of the accumulator so that it might make amends for the influence on the compressibility of air exerted on the characteristic of the thrust force of the cylinder. It is confirmed that the thrust force of the cylinder can be applied to the pneumatic joystick, and the z-axial force control is possible in the experiment. ©ISAROB 2007.

关键词： Pneumatics

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Performance of Falcon-I: Developed Low-Power and High-Sensitivity Cloud Profiling FM-CW Radar at 95GHz

Performance of Falcon-I: Developed Low-Power and High-Sensit...

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International Kharkov Symposium on Physics and engineering of Microwaves, Millimeter, and Submillimeter Waves

作者： Toshiaki Takano Yuji Nakanishi Hideji Abe Jun Yamaguchi Shin-Ichi Yokote Ken-Ichi Futaba Youhei Kawamura Hiroshi Kumagai Yuichi Ohno Tamio Takamura Teruyuki Nakajima Graduate School of Science and Technology Faculty of Engineering Venture Business Laboratory Chiba University Inage Chiba Japan Graduate School of Science and Technology Chiba University Inage Chiba Japan Faculty of Engineering Chiba University Japan National Institute of Information and Communications Technology USA Center for Environmental Remote Sensing Chiba University Japan Center for Climate Systems Research University of Tokyo Japan

We have developed a low-power and high-sensitivity cloud profiling radar, named FALCON-I, transmitting frequency modulated continuous wave (FM-CW) at 95 GHz for ground-based observations. Millimeter wave at 95 GHz is used to realize much higher sensitivity than lower frequencies to small cloud particles. An FM-CW type radar realizes similar sensitivity with much smaller output power to a pulse type radar. Two lm- diameter parabolic antennas separated by 1.4 m each other are used for transmitting and receiving the wave. The direction of the antennas is fixed at the zenith at this moment. The radar can observe clouds up to 20 km in height with the range resolution of 15 m and the angular resolution of 0.2 degree. Simultaneous observations of FALCON-I and a pulse type radar, SPIDER, show good performance of FALCON-I. Sensitivity of FALCON-I is -32 dBZ in radar reflectivity factor at 5 km, which is only 3 dB worse than that of SPIDER although its output power is 1/3000 to SPIDER. Ranging resolution of 15 m is realized for FALCON-I, which is 1/10 of that of SPIDER. Using developed FALCON-I, we observed clouds in various regions and oceans in the last three years.

关键词： Clouds Radar antennas Power generation Frequency modulation Millimeter wave radar Receiving antennas Transmitting antennas Directive antennas Reflectivity Oceans

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TRACKING DOMAINS FOR UNSTABLE PLANTS WITH SATURATING-LIKE ACTUATORS

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Asian Journal of Control 2008年第4期1卷

作者： V.A. Yakubovich S. Nakaura K. Furuta Vladimir A. Yakubovich is a corresponding member of Russian Academy of Science. Vladimir A. Yakubovich was born in Novosibirsk Russia in 1926. he entered Moscow University in 1946 and graduated in 1949. he received the Candidate of Science degree (Ph.D.) in 1953 and the Doctor of Science degree in 1959 from Leningrad University. In 1959 he joined the Leningrad University and he has remained since then. He is the author of more than 270 papers and a coauthor of seven books in different areas of applied mathematics and control theory. he has worked in parametric resonance theory in the theory of stability of nonlinear systems and in optimization theory. Dr. Yakubovich has served on many scientific committees and editorial boards. he is a member of several scientific socienties in Russia. He was awarded the Norbert Wiener Prize (1991) a prize from the international editorial company “Nauka” for best publication in its journals (1995) and the IEEE Control Systems Award (1996). Since 1991 he has been a corresponding member of the Russian Academy of Sciences. Dept. of Control Engineering Tokyo Institute of Technology Japan. Shigeki Nakaura received his B.S. and M.S. degrees in Control Engineering from the Tokyo Institute of Technology in 1995 and 1997 respectively. He is currently a PhD student of the Tokyo Institute of Technology. His research interests include robotics and intelligent machining. He is a member of SICE JSPE and IEEE. Katsuhisa Furuta was born in Tokyo Japan in 1940. He received his B.S. M.S. and Ph.D. degrees in Engineering from the Tokyo Institute of Technology in 1962 1964 and 1967 respectively. he was a post doctoral fellow at Laval University (Quebec Canada) from July 1967 to August 1969. Since then he has been a member of the teaching staff of the Tokyo Institute of Technology Department of Control Engineering where he is currently a Professor Graduate School of Information Science and Engineering. He was a Russell Severance Springer Professor University of California at

In many mechanical systems, the tracking control is one of the most important issues. Therefore for the unstable system subject to actuator saturation, the domain of the initial states corresponding to an arbitrary reference signal, within which tracking condition can be achieved, is interesting to be considered. In this paper, an approximate tracking domain is derived analytically. First in Theorem 1, for simple case, it is constructed by using the partial Lyapunov function and the absolute stability theory. In the following Theorems 2 and 3, a new idea is used to obtain larger domains. Finally in the last section, a simple numerical example is given.

关键词： Actuator constraint tracking control nonlinear analysis absolute stability

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CONTROL SYSTEM DESIGN CONSIDERING A TRADEOFF BETWEEN EVALUATED UNCERTAINTY RANGES AND CONTROL PERFORMANCE

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Asian Journal of Control 2008年第1期1卷

作者： Y. Wakasa Y. Yamamoto Dept. of Applied Analysis and Complex Dynamical Systems Graduate School of Informatics Kyoto University Kyoto Japan. Yuji Wakasa was born in Okayama Japan in 1968. He received the B.S. and M.S. degrees in engineering from Kyoto university Japan in 1992 and 1994 respectively. From 1994 to 1998 he was a Research Associate in the Department of Information Technology Okayama University. Since April 1998 he has been a Research Associate in the Graduate School of Informatics Kyoto University. His current research interests include robust control and control system design via mathematical programming. Yutaka Yamamoto received his B.S. and M.S. degrees in engineering from Kyoto University Kyoto Japan in 1972 and 1974 respectively and the M.S. and Ph.D. degree in mathematics from the University of Florida in 1976 and 1978 respectively. From 1978 to 1987 he was with Department of Applied Mathematics and Physics Kyoto University and from 1987 to 1997 with Department of Applied System Science. Since 1998 he is a professor at the current position. His current research interests include realization and robust control of distributed parameter systems learning control sampled-data systems and digital signal processing. Dr. Yamamoto is a receipient of the Sawaragi memorial paper award (1985) the Outstanding Paper Award of SICE (1987) Best Author Award of SICE (1990) the George Axelby Outstanding Paper Award of IEEE CSS in 1996 Takeda Paper Prize of SICE in 1997. He is a Fellow of IEEE. He was an associate editor of Automatica. He is currently an associate editor of IEEE Transactions on Automatic Control Systems and Control Letters and Mathematics of Control Signals and Systems. He is a member of the IEEE the Society of Instrument and Control Engineers (SICE) and the Institute of Systems Control and Information Engineers.

This paper presents a design method of control systems such that a designer can flexibly take account of tradeoffs between evaluated uncertainty ranges and the level of control performance. The problem is reduced to a BMI problem and approximately solved by LMIs. The convergence of the proposed approximation is proved in a modified sense. A numerical example shows the effectiveness of the proposed method in comparison with the standard robust control.

关键词： Control system design LMI BMI tradeoff curves

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A comparative evaluation of implementation methods for controlling the execution speed of a program by regulating I/O performance

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systems and Computers in Japan 2006年第7期37卷 72-82页

作者： Taniguchi, Hideo Graduate School of Information Science and Electrical Engineering Kyushu University Fukuoka 812-8581 Japan Department of Systems and Information Science Research Information Processing Society of Japan Japan Society for Software Science and Technology ACM

As the performance capacity of computer hardware increases, the processing time taken by software becomes shorter and it is now possible to have programs execute complex procedures. However, processing speed is highly dependent on the actual performance of the hardware. Therefore, it is necessary to establish control mechanisms in order to execute a given set of processing instructions at a speed within the limits of the hardware capacity that matches the demands of the user as well as the nature of the service provided by the software. In addition, there are various methods for implementing such control mechanisms: in the kernel of the operating system (OS) or as a library that is external to the OS. Each method has its own advantages and disadvantages. In this paper we describe and compare different methods for implementing program execution speed regulation procedures by controlling the input-output (I/O) performance. Specifically, we describe and compare implementations of a basic method for adjusting the number of times I/O is performed and a fundamental method for adjusting the time spent on I/O. In addition, we compare an implementation of a method for regulating I/O timing implemented as a library with an implementation in the OS kernel and highlight the advantages of each ap proach. © 2006 Wiley Periodicals, Inc.

关键词： Input output programs

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