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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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Real time monitoring of tool wear using multiple modeling method

Real time monitoring of tool wear using multiple modeling me...

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IEEE International Conference on Electric Machines and Drives (IEMDC)

作者： H.M. Ertunc K.A. Loparo E. Ozdemir H. Ocak Department of Electronics and Communication Engineering Kocaeli University Izmit Turkey Department of Electrical Engineering and Computer Science Case Western Reserve University Cleveland OH USA Technical Education Faculty Kocaeli University Izmit Turkey

ISBN: (纸本)0780370910

Real time monitoring of tool wear in machining operations is very crucial in order to prevent tool failures, increase machine utilization and decrease production cost in an automated manufacturing environment. In general the price of the tool is relatively low, but the failure can cause incomparably higher production cost. Over the years, a wide variety of tool condition monitoring (TCM) techniques has been developed based on sensor signals such as cutting forces, acoustic emission and vibration. In this paper, a real time monitoring technique based on multiple modeling method is presented for drilling operations which is one of the most widely used manufacturing operations. The multiple modeling method utilizes cutting forces (thrust and torque) collected during the drilling operation and classifies these forces using hidden Markov models (HMM) to determine wear status of the drill bit. Experimental results have been presented in order to demonstrate the effectiveness of the proposed method.

关键词： Condition monitoring Hidden Markov models Production Costs Drilling computerized monitoring Machining Manufacturing automation Acoustic sensors Acoustic emission

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Design and experimental evaluation of a self-tuning controller supplementing a robust PID controller

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JSME International Journal, Series C: Mechanical systems, Machine Elements and Manufacturing 2001年第1期44卷 53-60页

作者： Namba, Ryosuke Yamamoto, Toru Kaneda, Masahiro Department of Mechanical Engineering Graduate School of Engineering Hiroshima University 1-4-1 Kagamiyama Hiroshima 739-8527 Japan Department of Technology and Information Education Faculty of Education Hiroshima University 1-1-1 Kagamiyama Hiroshima 739-8524 Japan Department of Communication Engineering Faculty of Computer Science and Systems Engineering Okayama Prefectural University 111 Kuboki Soja Okayama 719-1197 Japan

PID controllers have been widely used in many chemical processes. Because they have only three control parameters and their physical meanings can be easily grasped. However, it is difficult to tune those parameters practically, since the process dynamics often change due to operating conditions or various disturbances. For this problem, a design method of robust PID controllers has been already proposed by the authors in order to guarantee the stability of the control system. However, as that control method is conservative, the desirable setpoint response can not be always obtained. In this paper, a design scheme of a self-tuning pre-filter is proposed to supplement the robust PID controller based on the two-degree-of-freedom control scheme. According to the proposed scheme, the transient property for the setpoint response can be improved keeping the robust stability. Finally, the proposed scheme is experimentally evaluated on an air pressure control system.

关键词： Mechanics

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Printed Thai character recognition using fuzzy-rough sets

Printed Thai character recognition using fuzzy-rough sets

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IEEE Region 10 International Conference TENCON

作者： Watjanapong Kasemsiri Chom Kimpan Information Science Laboratory Research Centre for Communication and Information Technology King Mongkut's Institute of Technology Bangkok Thailand Computer Engineering Department Faculty of Engineering King Mongkut's Institute of Technology Bangkok Thailand

This paper proposes the method of fuzzy rough sets for the recognition of Thai Characters. We divide the classification process into 2 levels, coarse and fine classification. Both levels of classification have the same processes, applying the rough set lower approximation and then using fuzzy rough sets. The difference between the two levels is in the features of the input data used for classifying. There are 40 coarse groups and some of them need not pass through the second level of classification. We trained this system with 2816 training samples, which were composed of 4 fonts and 4 sizes of characters. The system is tested with an unknown sample, which is composed of 7 fonts and 7 sizes of characters; 4 fonts and 4 sizes of the training sample are inclusive. The accuracy of this proposed system is as high as 89%.

关键词： Character recognition Rough sets Information systems system testing Laboratories Information technology Decision making Uncertainty Equations

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