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SICE Annual Conference

作者： K. Uahchinkul J. Ngamwiwit S. Phoojaruenchanachai Department Control Engineering Faculty of Engineeting ReCCIT KMITL Thailand Computer Automation Technolgy Laboratory NECTEC NSTDA Thailand

ISBN: (纸本)078039805X

In this paper, we present the theoretical development to stabilize a class of uncertain time-delay system and its application to model-following systems. The system under consideration is described in state space model containing state delay, uncertain parameters and disturbance. The main idea is to reduce the state of system into an equivalent one, by employing generalized transformation, which is easier to analyze its behavior and stability. Then, the min-max approach is employed to find the stabilizing control law. After that, a class of model-following system is introduced for controlling the error between the model and process. With the extended theorem, the suitable control law that guarantees model tracking is derived. Finally, two numerical simulations are illustrated to show the algorithm for applying the proposed theorems and the effectiveness of the designed control law in stabilizing the controlled systems.

关键词： Robustness Delay systems

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Electromagnetic field characteristics of radial line slot antennas for surface wave coupled plasma production

Electromagnetic field characteristics of radial line slot an...

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Antennas and Propagation Society International Symposium

作者： T. Yamamoto M. Ono M. Ando N. Goto N. Ishii Y. Yasaka Department of Electrical Engineering and Computer Sci. Faculty of Eng Yamagata University Yonezawa Yamagata Japan Department of Electrical and Electronic Engineering Faculty of Eng Tokyo Institute of Technology Meguro Tokyo Japan Department of Electronics and System Faculty of Engineering Takushoku University Hachioji Tokyo Japan Corporate R&D Central Research Laboratory Tokyo Electron Limited Nirasaki Yamanashi Japan

In plasma processing systems for large sized wafer, quick evacuation of reaction gas by making the process space gap narrow is required to realize higher productivity and better quality of microelectronic devices. The wafer must be placed closely to the antenna aperture in this case. A radial line slot antenna (RLSA) for surface wave coupled plasma (SWP) is a promising candidate to this end. A novel slot arrangement in the aperture, which consists of densely arrayed transverse slots, was fabricated and tested. A uniform, high electron density of 3/spl times/10/sup 11/ cm/sup -3/ and large-area plasma under the condition of low electron temperature has already been realized by experiments. It dispenses with DC magnetic fields required in ECR systems. For further development of slot design as well as the mechanism extraction of plasma generation, this paper evaluates the electromagnetic near fields of SWP RLSAs. As the first step, antennas in free space without the plasma as well as the glass vacuum window, is analyzed using the periodic array model. The predicted near field distribution is compared with the experiments and reasonable agreement is reported.

关键词： Electromagnetic fields Slot antennas Plasma temperature Plasma devices Apertures Plasma density Plasma waves Electrons Plasma properties Plasma materials processing

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A flexible scheduling for automobile control using imprecise computation and its fundamental evaluation

A flexible scheduling for automobile control using imprecise...

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IEEE International Conference on engineering of Complex computer systems

作者： F. Nakanishi S. Hiraike S. Inoue Y. Kakuda K. Toda Department of Computer Engineering Faculty of Imformation Sciences Hiroshima City University Asaminami Hiroshima Japan Computer Science Division Electro Technical Laboratory Tsukuba Japan

Imprecise computation is one of the promising schemes in real time systems to adapt the quality of computations to the change of load, keeping the deadlines of tasks in the systems. When overload occurs in the systems, the minimum requirements on the deadline are assured by decreasing the quality of the computation. This paper describes how to apply the concept of imprecise computation to automobile control in the expressway assuming the intelligent transportation system (ITS). The deadline violation of tasks for automobile control in the expressway induces collision of automobiles. Regardless of whether the expressway is congested or not, collision of automobiles must be avoided. To satisfy such requirement, the concept of imprecise computation is effective. This paper proposes a flexible scheduling using imprecise computation to avoid collision of automobiles and increase throughput.

关键词： Processor scheduling Automobiles Road accidents Throughput Real time systems Intelligent vehicles Intelligent transportation systems Automotive engineering Intelligent systems Computational modeling

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Data link control layer performance for variable packet size and fixed packet size (wireless ATM packet)

Data link control layer performance for variable packet size...

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IEEE Region 10 International Conference TENCON

作者： S.K.A. Yaklaf B.M. Ali V. Prakash S. Khatun A. Gasim Department of Computer & Communication System Eng Faculty of Engineering Universiti Putra Malaysia Serdang Selangor Darul Ehsan Malaysia Universiti Putra Malaysia Serdang Selangor MY

This paper deals with the transmission of digital data in ATM like format over a noisy wireless channel affected by burst of errors. It evaluates and compares go-back-N (GBN) and selective repeat (SR) for non-real time traffic over the wireless portion of the network for variable packet size and fixed packet size, and the effect of packet loss and check-sum error percentages on the throughput. Results show that SR-ARQ achieves better throughput under a wide variety of error rate conditions than GBN-ARQ.

关键词： Size control Asynchronous transfer mode Automatic repeat request Forward error correction Error correction Wireless application protocol Strontium Radio link Telecommunication traffic Throughput

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digital simulation of power systems and power electronics using the MATLAB/Simulink Power system Blockset

Digital simulation of power systems and power electronics us...

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IEEE Winter Meeting Power engineering Society

作者： G. Sybille Hoang Le-Huy Power System Simulation Laboratory Institut de recherche d''Hydro-Quebec Varennes QUE Canada Department of Electrical and Computer Engineering Université Laval Sainte-Foy QUE Canada

The Power system Blockset (PSB) is a graphic tool that allows schematics and simulation of power systems to be built in the Simulink environment. The blockset uses the MATLAB/Simulink environment to represent common components and devices found in electrical power networks. Simulink's variable-step event-sensitive integration algorithms allow increased accuracy in zero-crossing detection of currents as compared with fixed step algorithms. One important feature of the Power system Blockset which has been introduced with version 2.0 is its ability to simulate either with continuous variable time-step integration algorithms or with a discretized system. For small and medium size systems, variable time steps algorithms are usually faster because the number of steps will be less than with a fixed-time step method. However, for large systems which contain many states or many nonlinear blocks such as power electronic switches, it is advantageous to discretize the electrical system. Both the continuous integration and fixed-time step methods are illustrated. The graphic interface of Simulink provides a user-friendly environment where the power circuit and control system are represented in the same diagram. The results are displayed while the simulation is running. The processing power of MATLAB allows the designer to perform complex post-processing on simulation results. This special technical session presents the features of the Power system Blockset and its applications in the simulation of power systems and power electronics systems.

关键词： Power system simulation digital simulation MATLAB Power electronics Circuit simulation Libraries Power system modeling Power system analysis computing Graphics Control systems

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Wireless optical transmissions with white colored LED for wireless home links

Wireless optical transmissions with white colored LED for wi...

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IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： Y. Tanaka S. Haruyama M. Nakagawa Department of Electrical Engineering Faculty of Science and Technology Keio University Yokohama Kanagawa Japan Advanced Telecommunication Laboratory Sony Computer Science Laboratories Inc. Shinagawa Tokyo Japan

We propose a wireless optical communication system with white colored LEDs for a wireless home link (WHL). The white colored LEDs have a high power output and are regarded as lamps for the next generation. In the proposed system, this device is used for a wireless home link. The proposed system is suitable for private networks such as consumer communication networks. From numerical and simulation results, it is confirmed that the proposed system is available and the problems to be solved are made clear.

关键词： Light emitting diodes Optical transmitters Optical fiber communication Radio transmitters High speed optical techniques Optical receivers Wireless communication Optical mixing Laboratories Optical devices

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Energy shaping revisited

Energy shaping revisited

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IEEE Conference on Control Technology and Applications (CCTA)

作者： R. Ortega I. Mareels A.J. van der Schaft B. Maschke Laboratory des Signaux et Systèmes CNRS-SUPELEC Gif-sur-Yvette France Faculty of Applied Mathematics University of Twente Enschede Netherlands Department Electrical and Computer Engineering University of Melbourne Melbourne Australia Automatisme Industriel CNAM Paris France

Energy shaping is the essence of passivity based control (PBC), a controller design technique that is very well-known in mechanical systems. Our objectives in the article are threefold. First, to call attention to the fact that PBC does not rely on some particular structural properties of mechanical systems, but hinges on the more fundamental (and universal) property of energy balancing. Second, to identify the physical obstacles that hamper the use of "standard" PBC in applications other than mechanical systems. In particular, we show that "standard"" PBC is stymied by the presence of unbounded energy dissipation, hence it is applicable only to systems that are stabilizable with passive controllers. Third, to revisit a PBC theory that has been developed to overcome the dissipation obstacle, as well as to make the incorporation of process prior knowledge more systematic. These two important features allow us to design energy based controllers for a wide range of physical systems.

关键词： Control systems Mechanical systems Automatic control Equations Integrated circuit interconnections Shape control Power system interconnection Mechanical factors Energy capture Mathematics

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Effective testing and debugging methods and its supporting system with program deltas

Effective testing and debugging methods and its supporting s...

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International Workshop on Principles of Software Evolution

作者： M. Matsushita M. Teraguchi K. Inoue Dept. of Inf. & Comput. Sci. Osaka Univ. Japan Tokyo Research Laboratory IRM Japan Limited Yamato Kanagawa Japan Department of Information and Computer Science Faculty of Engineering Science Osaka University Toyonaka Osaka Japan Information Technology Center Nara Institute of Science and Technology Ikoma Nara Japan

ISBN: (纸本)0769509061

In the maintenance phase of software development, it is necessary to check that all features still perform correctly after some changes have been applied to existing software. However, it is not easy to debug the software when a defect is found in those features which have not changed during the modification, even using a regression test. Existing approaches employ program deltas to specify defects; they have the limitation of it being hard to enact them, and they don't support any actual debugging activities. Moreover, such a system is hard to introduce into an actual environment. In this paper, we propose DMET (Debugging METhod) to solve such problems. DMET supports debugging activities when a defect is found by regression tests through detection, indication and reflection procedures. We also implement DSUS (Debugging SUpporting system) based on DMET. DSUS executes DMET procedures automatically, and it is easy to configure for an existing environment. Through experimentation with DMET and DSUS, we have confirmed that DMET/DSUS reduce the debugging time of software significantly. As a result, DMET/DSUS help in evolving the software for the software maintenance aspects.

关键词： system testing Software maintenance Software testing Software debugging Operating systems Laboratories Information technology Software performance Reflection Programming

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Information presentation by inferring user's interests based on individual conceptual spaces

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systems and computers in Japan 2000年第10期31卷 41-55页

作者： Sumi, Kaoru Sumi, Yasuyuki Mase, Kenji Nakasuka, Shin-Ichi Hori, Koichi Breakthrough21 Nishida Project Communication Research Laboratory Hyogo 651-2401 Japan ATR Media Intgn. Commun. Res. Labs. Kyoto 619-0288 Japan Faculty of Engineering University of Tokyo 153-8904 Japan Science University of Tokyo University of Tsukuba University of Tokyo ATR Media Intgn. Commun. Res. Labs. Breakthrough21 Nishida Project Communications Research Laboratory Min. of Posts and Telecommunications Japan. Soc. for Artif. Intelligence Info. Processing Society of Japan Waseda University IEICE IPSJ Amer. Assoc. for Artif. Intelligence Nagoya University Department 2 Nippon Telegraph and Tel. Corp. NTT Human Interface Laboratories MIT's Media Laboratory IPSJ IEICE IEEE Computer Society

We present the system called Takealook, which personalizes information presentation according to the user's interests and knowledge. The system infers the user's interests from her/his question-and-answer interactions and the information presenters' conceptual spaces by using the related method of collaborative filtering. It then provides additional information about current contents and also recommends other related contents. The user's interests are represented by her/his own individual conceptual space (i.e., a set of related keywords) which is adapted to her/his preferences. In this paper we describe a method for personalizing the information presentation, implementating the system at reviewing an exhibition, and experimental results.

关键词： Artificial intelligence

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The Paderborn university BSP (PUB) library-design, implementation and performance

The Paderborn university BSP (PUB) library-design, implement...

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International Symposium on Parallel Processing

作者： O. Bonorden B. Juurlink I. Von Otte I. Rieping Heinz Nixdorf Institute and Department of Computer Science Paderborn University Paderborn Germany Laboratory of Computer Architecture and Digital Techniques Department of Electrical Engineering Delft Technical University Delft Netherlands

The Paderborn University BSP (PUB) library is a parallel C library based on the BSP model. The basic library supports buffered and unbuffered asynchronous communication between any pair of processors, and a mechanism for synchronizing the processors in a barrier style. In addition, it provides routines for collective communication on arbitrary subsets of processors, partition operations, and a zero-cost synchronization mechanism. Furthermore, some techniques used in its implementation deviate significantly from the techniques used in other BSP libraries.

关键词： Libraries system recovery Costs Electrical capacitance tomography Workstations Parallel programming computer architecture Electronic mail Safety Yarn

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