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Annual Conference of Industrial Electronics Society

作者： K. Natori T. Tsuji K. Ohnishi A. Hace K. Jezernik Department of System Design Engineering Keio University Yokohama Kanagawa Japan Faculty of electrical Engineering and Computer Science Institute of Robotics University of Maribor Maribor Slovenia

Smith predictor is a well-known method for compensating time delay in control systems. Therefore, it has been applied to many systems with time delay so far. However, delay time should be estimated precisely in this method. So, if time delay is fluctuant and unpredictable, like the communication delay over the Internet, performance of Smith predictor deteriorates. This paper proposes "Communication Disturbance Observer". It regards the error caused by time delay as disturbance torque (or acceleration), then it can observe and compensate the error. Furthermore, it doesn't need to estimate the value of delay time; therefore it can be applied to control systems with fluctuant and unpredictable time delay. It can be said that control system with "Communication Disturbance Observer" is robust to time delay and fluctuation of that. Effectiveness and robustness of proposed method is shown by result of simulation and experiment. In experiment, master-slave manipulator was used over the Internet. We were able to get the sense of touch from the environment of remote site.

关键词： Robust control Communication system control Internet Delay effects Delay estimation Control systems Torque Acceleration Fluctuations Robustness

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Recurrent neural network with backpropagation through time for speech recognition

Recurrent neural network with backpropagation through time f...

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International Symposium on Communications and Information Technologies (ISCIT)

作者： A.M. Ahmad S. Ismail D.F. Samaon Universiti Teknologi Malaysia Malaysia Department of Software Engineering Faculty of Computer Science and Information System Universiti Teknologi Malaysia Skudai Johor Malaysia

Speech recognition and understanding have been studied for many years. The neural network is well-known as a technique that is able to classify nonlinear problems. Much research has been done in applying neural networks to solving the problem of recognizing speech such as Arabic. Arabic offers a number of challenges to speech recognition. We propose a fully-connected hidden layer between the input and state nodes and the output. We also investigate and show that this hidden layer makes the learning of complex classification tasks more efficient. We also investigate the difference between LPCC (linear predictive cepstrum coefficients) and MFCC (Mel-frequency cepstral coefficients) in the feature extraction process. The aim of the study was to observe the differences in the 29 letters of the Arabic alphabet from "alif" to "ya". The purpose of this research is to upgrade the knowledge and understanding of Arabic alphabet or words using a fully-connected recurrent neural network (FCRNN) and backpropagation through time (BPTT) learning algorithm. Six speakers (a mixture of male and female) in a quiet environment are used in training.

关键词： Recurrent neural networks Backpropagation Speech recognition Neurofeedback Neural networks Natural languages Writing Neurons Software engineering computer science

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H/sub /spl infin// controller order reduction due to stable invariant zeros and its application to a magnetic suspension system

H/sub /spl infin// controller order reduction due to stable ...

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IEEE Conference on Control Technology and Applications (CCTA)

作者： Xin Xin M. Kaneda S. Hara Department of Communication Engineering Faculty of Computer Science and System Engineering Okayama prefectural University Soja Okayama Japan Department of Information Physics and Computing Graduate School of Information Science and Technology University of Tokyo Bunkyo Tokyo Japan

This paper studies the H/sub /spl infin// controller order reduction due to the stable invariant zeros and its application to a magnetic suspension system. First, we explore the H/sub /spl infin// controller order reduction due to the stable complex invariant zeros to address how we can go beyond the known results for the order reduction due to the unstable or real stable invariant zeros. We propose sufficient conditions for the existence of the reduced-order H/sub /spl infin// controllers due to the stable complex invariant zeros. If the proposed sufficient conditions are satisfied, we present two LMI based procedures to compute the reduced order H/sub /spl infin// controllers. Second, we address the application of these theoretical results to a mixed sensitivity problem for a magnetic suspension system with a flexible beam. The numerical computations of the reduced-order controllers and the comparison with the full-order controllers are reported. The numerical investigation carried out validates the proposed theoretical results.

关键词： Control systems Magnetic levitation Sufficient conditions Design methodology Communication system control Transfer functions Error correction systems engineering and theory Physics Information science

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Challenge of human factor influence for car safety

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Neural Network World 2004年第1期14卷 37-47页

作者： Novák, Mirko Votruba, Zdenëk Jt. Laboratory of System Reliability Faculty of Transportation Sciences Czech Technical University Prague Institute of Computer Science Acad. of Sci. of the Czech Republic Prague Department of Control Engineering Faculty of Transportation Sciences Czech Technical University Prague

The challenge of human factor influence for analyzing the reliability and safety of car transportation is discussed. An analysis of the density and the kind of use among the drivers in different regions and seasons of the year is made. The possibilities to detect the driver falling into a relaxant, somnolent or micro-sleep stage by the use of suitable combination of secondary factors are investigated. The operation of the driver in the moving car is an example of very complicated interaction between several very heterogeneous systems.

关键词： Motor transportation

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Design of distributed energy systems based on probabilistic analysis

Design of distributed energy systems based on probabilistic ...

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International Conference on Probabilistic Methods Applied to Power systems (PMAPS)

作者： G. Papaefthymiou A. Tsanakas P.H. Schavemaker L. van der Sluis Electrical Power System Laboratory EPS Faculty of Electrical Engineering Mathematics & Computer Science Delft University of Technnology Delft Netherlands Center for Quantitative Finance Imperial College London London UK

In this paper a design methodology of 'distributed' energy systems is presented. These are defined as energy systems with unregulated distributed generators connected to the lower voltage levels. The cornerstone in their design is the steady-state analysis of distribution systems under uncertainty in energy in energy generation and consumption. Based on this definition, the structure of a system-design tool is proposed. The system is described by the steady-state model, while all different types of distributed generators (dispatchable or nondispatchable technology concepts) are treated in a unifying manner through probabilistic modelling. The modelling of the interdependence between the random input variables is treated by introducing the concepts of comonotonicity, countermonotonicity and independence between distributed generations and distributed consumptions as stochastic bounds describing extreme statistical dependence between the input random variables.

关键词： Power generation Distributed control Power systems Load flow analysis Power system reliability Design methodology Voltage Steady-state Random variables Risk analysis

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A test structure for two-dimensional analysis of MOSFETs by hot-carrier-induced photoemission

A test structure for two-dimensional analysis of MOSFETs by ...

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IEEE International Conference on Microelectronic Test Structures

作者： T. Matsuda A. Muramatsu H. Iwata T. Ohzone K. Yamashita N. Koike K. Tatsuuma Department of Electronics and Informatics Toyama Prefectural University Imizu Toyama Japan Faculty of Computer Science and System Engineering Okayama Prefectural University Soja Okayama Japan ULSI Process Technology Development Center Semiconductor Company Matsushita Elecrric Indusrrial Company Limited Minami Kyoto Japan

A test structure and method for two-dimensional analysis of fabrication process and reliability of MOSFET using a photoemission microscope are presented. Arrays of 20/spl times/10(=200) MOSFETs were successfully measured at a time and evaluated the fluctuation of their characteristics. The fluctuation of hot-carrier-induced photoemission intensity was larger as gate length becomes smaller. Although the intensity fluctuation of photoemission in the same MOSFET was within small range, the fluctuation all over the MOSFET array was relatively large and independent of the position in the array.

关键词： MOSFETs Hot carriers Photoelectricity Charge coupled devices Fluctuations Circuit testing Time measurement Optical microscopy Wavelength measurement Electric variables measurement

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Raman scattering investigation of a Ge/SiO2/Si nanocrystal system under hydrostatic pressure

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Physical Review B 2004年第12期69卷 125333-125333页

作者： Lei Liu K. L. Teo Z. X. Shen J. S. Sun E. H. Ong A. V. Kolobov Y. Maeda Physics Department Blk. S12 Faculty of Science National University of Singapore 2 Science Drive 3 117542 Singapore Department of Electrical and Computer Engineering National University of Singapore 4 Engineering Drive 3 117576 Singapore Mechatronics & Micro System Group Data Storage Institute 117608 Singapore Center for Applied Near-Field Optics Research (CANFOR) National Institute of Advanced Industrial Science and Technology Tsukuba Central 4 1-1-1 Higashi Tsukuba Ibaraki 305-8562 Japan Department of Energy Science and Technology Kyoto University Sakyo-ku Kyoto 606-8501 Japan

We have studied the hydrostatic pressure dependence of Ge nanocrystals embedded in a SiO2 matrix on a Si substrate by Raman scattering at room temperature. During the first cycle of increasing pressure, we observed a step change in the Ge Raman mode from 310.4 to 313.8cm−1 at ∼23kbar. The linear pressure coefficients α obtained before and after the step change at ∼23kbar are 0.42 and 0.64cm−1kbar−1, respectively. Upon decreasing pressure, the Ge mode follows a single slope of pressure coefficient α=0.64cm−1kbar−1. A finite-element analysis was carried out to investigate the elastic-field distribution in the Ge/SiO2/Si nanocrystal system, where the discontinuity of the specific geometric configuration with different elastic constants causes local areas of stress concentration around the interface. The step change of the Raman shifts with pressure at ∼23kbar was attributed to complete delamination between the SiO2 film and the Si substrate.

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Solvability of norm-type discrete algebraic Riccati equation

Solvability of norm-type discrete algebraic Riccati equation

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2003 European Control Conference, ECC 2003

作者： Kono, M. Takahashi, N. Sakamoto, M. Department of Computer Science and System Engineering Faculty of Engineering Miyazaki University 1-1 Gakuen Kibanadai Nishi Miyazaki889-2192 Japan

ISBN: (纸本)9783952417379

This paper proposes a norm-type discrete algebraic Riccati Equation, which is a generalized version of the well-known standard discrete algebraic Riccati Equation, and has additional norm terms. Under stabilizability and assumption that the additional terms are not too large, the existence of a positive semidefinite solution is guaranteed. Application to guaranteed cost control is given. © 2003 EUCA.

关键词： Robust control

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Architecture of the virtual training system for buoyancy control 03

Architecture of the virtual training system for buoyancy con...

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9th EUROGRAPHICS Workshop on Virtual Environments, EGVE 2003

作者： Korošec, Dean Slavinec, Mitja Bernad, Dani Kolarič, Primož Prnaver, Katja University of Maribor Faculty of Electrical Engineering and Computer Science System Software Laboratory Slovenia University of Maribor Faculty of Education Department of Physics Slovenia Regional Development Agency Mura Murska Sobota Slovenia

ISBN: (纸本)1581136862

In this paper we present the structure of the simulator which would allow diving beginners to experience the effect of buoyancy control mechanisms before actually entering the *** believe such training would be less stressful and safer for all participants, but it should also reduce the time in water needed to manage basic practical diving skills. Central design requirements for the system were: realistic modelling of diving physics, various options of man-machine interface and possibility of immersion. With future studies we plan to clarify to what extent the immersive VR interfaces are able to further improve the diving training experience. © 2003 The Eurographics Association.

关键词： E-learning

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Time delay effects of utterance to communicative actions on greeting interaction by using a voice-driven embodied interaction system

Time delay effects of utterance to communicative actions on ...

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IEEE International Symposium on Computational Intelligence in Robotics and Automation (CIRA)

作者： M. Yamamoto T. Watanabe Faculty of Computer Science and System Engineering Okayama Prefectural University Japan Faculty of Computer Science and System Engineering Okayama Prefectural University CREST of Japan Science and Technology Agency Japan

The timing to generate communicative actions and utterance in face--to-face greetings are analyzed by synthesis. First, the analysis of the greeting experiment clarifies that utterance of human is delayed for 0.3 sec to communicative actions. Then, the analysis by synthesis by using an embodied robot confirms that the variation of the lags of utterance to communicative actions brings different communicative effects, i.e. about 0.3 sec lag is desirable for single greetings, and the longer lag is for polite greetings. This result demonstrates the importance of the timing in human-robot embodied communication.

关键词： Delay effects Humans Face Layout Timing Robots Performance analysis computer science systems engineering and theory Speech analysis

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