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SICE Annual Conference

作者： Xin Xin M. Kaneda Department of Communication Engineering Faculty of Computer Science and System Engineering Okayama Prefectural University Soja Okayama Japan

ISBN: (纸本)0780373065

Studies the swing up control for the Acrobot, i.e., to move the Acrobot from its stable downward position to its unstable inverted position and balance it about the vertical. A control scheme which combines of the partial linearization control (related to the first link) for the swing up phase introduced in Spong (1995) and robust control for the capture and balance phase is proposed. The key idea is to treat the speed of the second link when the Acrobot rotates across the vertical as an uncertainty, and to design a robust controller to cope with such uncertainty by using the LMI solution to the quadratic stabilization problem. Hence, the basin of attraction of the robust controller is bigger than that of the LQR controller which is designed based on the linearized model of the Acrobot around the unstable equilibrium. The simulation results have verified the effectiveness of the proposed control scheme.

关键词： Robust control Control systems Uncertainty communication system control Mechanical systems Actuators Robots computer science systems engineering and theory Robust stability

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CLOSURE PROPERTY OF PROBABILISTIC TURING MACHINES AND ALTERNATING TURING MACHINES WITH SUBLOGARITHMIC SPACES

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International Journal of Foundations of computer science 2001年第3期12卷 397-409页

作者： GÉZA HARVÁTH KATSUSHI INOUE AKIRA ITO YUE WANG Department of Computer Science and System Engineering Faculty of Engineering Yamaguchi University Ube 755-8611 Japan

This paper first shows that (1) the class of languages recognized by o(log n) space-bounded two-way Monte Carlo Turing machines is not closed under concatenation, Kleene closure, and length-preserving homomorphism, and (2) the class of languages recognized by o(log log n) space-bounded two-way unbounded error probabilistic Turing machines is not closed under each of the above operations. We then show that the class of languages accepted by S(n) space-bounded two-way alternating Turing machines is not closed under each of the above operations for log log n ≤ S(n) ≤ o(log n).

关键词： closure property probabilistic Turing machines alternating Turing machines subalgorithmic spaces

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3D shape evaluation analysis by synthesis in virtual space for collaboration

3D shape evaluation analysis by synthesis in virtual space f...

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IEEE International Workshop on Robot and Human communication (ROMAN)

作者： M. Okubo T. Watanabe Department of System Engineering Faculty of Computer Science and System Engineering Okayama Prefectural University Soja Okayama Japan

It is indicated that there is a high possibility of disagreement between 3D shape evaluation in virtual space and that in real space. In our previous paper (M. Okubo and T. Watanabe, 2000), a 3D shape evaluation support system in virtual space was proposed. Because the system integrates the visual and gazing line-motion information in virtual space and tactile information in real space, each piece of information can be controlled for analysis of 3D shape evaluation in virtual space by synthesis. On the other hand, there are cases in which long distance designers evaluate the same 3D shapes through the Internet. In this case, the time delay of information must have occurred. From this point of view, the influence of visual information with time delay on the 3D shape evaluation in virtual space is investigated by using the proposed system. A sensory evaluation by paired comparison of 3D shapes and a questionnaire are carried out in virtual space with and without time delay and in real space. The results show that the visual information with time delay affects the shape evaluation in virtual space, especially the evaluation of the details of shapes.

关键词： Collaboration Delay effects Space technology Magnetic sensors systems engineering and theory Shape control Three dimensional displays Magnetic heads Watches computer science

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A decentralized optimal control scheme for route guidance in urban road networks

A decentralized optimal control scheme for route guidance in...

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International Conference on Intelligent Transportation

作者： R. Minciardi F. Gaetani DIST Department of Communication Computer and System SciencesFaculty of Engineering University of Genova Genoa Italy

A feedback decentralized optimal approach for traffic control in urban networks is developed. The control structure is based on the minimization of an objective function corresponding to the difference among the travel times from each origin node to all the possible destination through the available route on the network. The problem solution is provided on a temporal horizon not specified. The adopted methodology foresees the use of three different algorithmic structures; the first one is able to define the dynamics of the transportation system, and has gotten with a macro model of traffic simulation; the second is used for estimating the travel times on the links, using Gallager's algorithm (1977), and the third defines the resolution of a linear problem of optimization subject to non linear constraints.

关键词： Optimal control Intelligent networks Traffic control communication system traffic control Telecommunication traffic Transportation Stochastic processes Distributed control Roads Management information systems

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A characterization of k-th powers P_n,k of paths in terms of k-trees

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International Journal of Foundations of computer science 2001年第4期12卷 435-443页

作者： Yamazaki, Koich Tani, Sei'Ichi Nishino, Tetsuro Department of Computer Science Gunma University Kiryu Gunma 376-8515 1-5-1 Tenjin-cho Japan Department of Computer Science and System Analysis Nihon University Setagaya-ku Tokyo 156-8550 Sakurajousui 3-25-40 Japan Department of Information and Communication Engineering University of Electro-Communications Chofu Tokyo 182-8585 Japan

Let G be a k-tree such that |{v V(G): degG(v) = k}| = 2, n = |V(G)| ≥ 2k + 2, and the maximum degree of G is at most 2k. In this paper, we will show that such a k-tree G is isomorphic to Pn,k. In this way, we give a ... 详细信息

Let G be a k-tree such that |{v V(G): deg_G(v) = k}| = 2, n = |V(G)| ≥ 2k + 2, and the maximum degree of G is at most 2k. In this paper, we will show that such a k-tree G is isomorphic to P_n,k. In this way, we give a new characterization of k-th power (i.e. P_n,k) of paths with n vertices in terms of k-trees. © 2001 World Scientific Publishing Company.

关键词： bandwidth k-th power of paths k-trees treewidth

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Guaranteed quality of service for multimedia applications over a priority-oriented token-passing bus local area network

Guaranteed quality of service for multimedia applications ov...

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IEEE Conference and Exhibition on Global Telecommunications (GLOBECOM)

作者： M. Nofal M.A. Ahmad Department of Electronics and Communication Engineering Faculty of Electronic Engineering Menouf Egypt Department of Mathematics and Computer Science Faculty of Science Shibin El Kom Egypt

Supporting multimedia applications with guaranteed quality of service over a token-passing bus local area network (LAN) is explored through extensive computer simulations. As the provision of real-time properties over a LAN is not so easy to assure, we introduce two levels of priority mechanisms to privileged stream-oriented traffic over burst traffic. One priority level is imposed over the (logical-ring) bus while the other is applied inside the station. In addition, we suggest two algorithms of token utilization; namely, the limited and exhaustive disciplines. The performance of the network is investigated under different operating scenarios. The effect of system parameters on the network performance is discussed and compared. The obtained results show that the token-passing bus LAN with the right compromise is effectively capable of delivering multimedia services without violating their service quality constraints. This will herald a new generation of electronic offices and factory automation.

关键词： Quality of service Local area networks Streaming media Delay Bit rate Application software Telecommunication traffic Traffic control Manufacturing automation Access protocols

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Performance analysis and optimization of a mobility support ATM switch

Performance analysis and optimization of a mobility support ...

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GLOBECOM'01. IEEE Global Telecommunications Conference (Cat. No.01CH37270)

作者： Sabira Khatun Borhanuddin Mohd Ali V. Prakash M. Ismail Department of Computer and Communication System Engineering Faculty of Engineering Universiti Putra Malaysia Serdang Selangor Darul Ehsan Malaysia Department of Electrical Electronic and System Engineering Faculty of Engineering University Kebangsaan Malaysia Bangi Selangor Darul Ehsan Malaysia

In wireless communication networks, handoff management is one of the challenging areas in order to maintain the connectivity and its efficiency in handling the mobile users. A handoff switch is defined as a point in the network from which a new sub-path to new base station is established. It should have functions for rerouting and buffering. We propose an asynchronous transfer mode (ATM) switch with handoff support functions, which may perform buffering and rerouting efficiently, achieves in-sequence cell transmission and minimizes the cell loss during a handoff. Buffering is needed in the mobility support ATM switch to reduce the cell loss probability (CLP) with tolerable delay maintaining in-sequence cell delivery, which is not available in ATM switch. A mobility support ATM switch with fully shared input buffer functionality is analyzed with required optimum buffer size under bursty (on-off) traffic maintaining the quality of service (QoS) contract.

关键词： Performance analysis Switches Asynchronous transfer mode Quality of service Wireless communication communication switching Base stations Propagation losses Delay Contracts

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Time slot allocation scheme based on a region division in CDMA/TDD systems

Time slot allocation scheme based on a region division in CD...

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IEEE Conference on Vehicular Technology (VTC)

作者： Sung-Hong Wie Dong-Ho Cho Communication and Information System Laboratory Department of Electrical Engineering & Computer Science Korea Advanced Institute of Science and Technology Taejon South Korea

In wireless multimedia networks, there exists traffic asymmetry between uplink and downlink channels. The CDMA/TDD system can alleviate this problem, however, previous work in this area can not manage efficiently the traffic, asymmetry among cells. In this paper, we propose a new time slot allocation scheme that considers the traffic pattern of each cell. To solve the inter-cell interference problem, we divide a cell's area into two regions and we allocate the resource of crossed slots to mobile stations which are existing in the inner-region. This proposed scheme increases the resource utilization and decreases the blocking probability of the system as a whole. And our DARD (Different time slot Allocation based on a Region Division) scheme outperforms conventional SA (Same time slot Allocation) scheme in the heterogeneous traffic environment.

关键词： Multiaccess communication Resource management Downlink Interference Multimedia systems Intelligent networks Information systems Laboratories computer science Web and internet services

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Efficiency improvement of Korean information retrieval system using relative distance between index words

Efficiency improvement of Korean information retrieval syste...

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IEEE International Symposium on Industrial Electronics (ISIE)

作者： Byung-Ho Lee Dae-Won Park YooJin Chung Hyuk-Chul Kwon Department of Information System Engineering Pusan National University South Korea Department of Computer Science Pusan National University South Korea Research Institute of Computer and Information & Communication Pusan National University South Korea

ISBN: (纸本)0780370902

An information retrieval system (IR system) collects documents, analyses the contents of the documents, and saves them in the form of a structure effective to search. The IR system provides the user with proper information. In Korean, predicates specify the meaning of nouns. Therefore, if predicates are used as index words in retrieval, the retrieval precision can be raised. In this study, the author implements an IR system using predicates as index words and interrelation by the relative distance of a predicate and a noun. He inspects an efficient storing structure of index words as well.

关键词： Information retrieval Content based retrieval Dictionaries Frequency Data mining Information systems systems engineering and theory computer science Electronic mail Text analysis

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Design and implementation of multi-agent environment for Internet information retrieval service

Design and implementation of multi-agent environment for Int...

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IEEE International Symposium on Industrial Electronics (ISIE)

作者： Byung-Ho Lee Min-Sik Park Yoojin Chung Hyuk-Chul Kwon Department of Information System Engineering Pusan National University South Korea Department of Computer Science Pusan National University South Korea Research Institute of Computer Information & Communication Pusan National University South Korea

ISBN: (纸本)0780370902

As the volume of Internet information has been increasing, an Internet retrieval agent is studied to offer an individualized or specialized retrieval engine according to the user's preference and purpose and to overcome the weak points existing in retrieval engines. In order to elevate the recall and precision of a retrieval engine and simultaneously to get effective results, the existing retrieval engine should be moduled enabling effective distribution and multi-processing. Through this process user preference should be reflected on the retrieval result. In this study we transformed the Mirine system (made by PNU) into the base system of the agent and constructed the retrieval agent environment for distribution, multi processing, and real searching.

关键词： Web and internet services Information retrieval Search engines Protocols Natural languages Information systems systems engineering and theory computer science Electronic mail computer networks

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