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IEEE Symposium on Intelligent Vehicle

作者： G. Adorni S. Cagnoni M. Mordonini M. Piaggio Department of Computer Engineering University of Parma Parma Italy Department of Communication Computer and System Science University of Genoa Genoa Italy

In robot soccer, as well as in real soccer and in every team effort, coordination between members of a team is a key issue. We describe the coordination strategies that were designed to achieve effective cooperation between a robot goal-keeper and the rest of the ART (Azzurra Robot Team) team that participates in the RoboCup F-2000 (midsize) competitions.

关键词： Robot kinematics Subspace constraints Intelligent robots Artificial intelligence Hardware Robot sensing systems Protocols Intelligent systems communication system software Sensor phenomena and characterization

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Second Order Sliding Modes Control of Underwater Vehicles Tracking the Gradient of Artificial Potential Fields

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IFAC Proceedings Volumes 2000年第17期33卷 1105-1110页

作者： Giorgio Bartolini Mauro Coccoli Elisabetta Punta Department of Electrical and Electronic Engineering (DIEE) University of Cagliari Cagliari Italy. Department of Communication Computer and System Sciences (DIST) University of Genova Genova Italy.

In this paper a multiinput second order sliding rnode control algorithm for underwater vehicles trajectory tracking will be introduced. The proposed approach guarantees perfect tracking and stabilization even in presence of disturbances and uncertainties typical of this kind of systerns. The trajectories to be tracked are designed basing on an artificial potential field technique. The control objectives are achieved by acting on the voltage of the motors driving the thrusters and the resulting forces and torques are continuous.

关键词： Second order sliding mode control underwater vehicles navigation artificial potential fields

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A prototype of Web-based simulation environment: using CGI and Javascript

A prototype of Web-based simulation environment: using CGI a...

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IEEE Region 10 International Conference TENCON

作者： Tan Kee Leong B.M. Ali V. Prakash N. Nordin Department of Computer and Communication System Faculty of Engineering Universiti Putra Malaysia Serdang Selangor Darul Ehsan Malaysia

We present the Websim project, a simulation environment for self-developed simulation tools. It provides Web and distributed features for a simulation model or library created using the C/C++ language. Websim is implemented using CGI and Javascript technologies. It can be accessed on any platform (Unix, PC or Mac) using a standard Web browser. With this simulation environment, an easier and faster integration of simulation and visualization techniques and tools into the Internet will be supported. The possibilities and problems of these techniques are discussed.

关键词： Virtual prototyping Java Computational modeling computer simulation Mathematical model Internet Circuit simulation computer architecture Web server Libraries

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An adaptive end-to-end QoS management for multimedia applications over wireless ATM network

An adaptive end-to-end QoS management for multimedia applica...

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IEEE Region 10 International Conference TENCON

作者： B.M.A. Prihandoko V. Prakash M.R. Mukerjee M.H. Habaebi Department of Computer and Communication System Faculty of Engineering Universiti Putra Malaysia Malaysia Universiti Putra Malaysia Serdang Selangor MY

The provision of multimedia application services over mobile wireless network is a very challenging problem. One major problem encountered is the maintenance of the QoS satisfaction for every application running over the network. Wireless ATM (WATM), as one of the next generation wireless system, is expected to provide such a service. After reviewing four current projects dealing with QoS management in the wireless network, this paper presents our approach to deliver an alternative solution to the problem, which is called AdQoS (adaptive QoS). This system introduces some improvements over the other systems. The comparison among the techniques are presented and discussed.

关键词： Quality of service Asynchronous transfer mode Wireless networks Bandwidth Application software Switches Base stations Traffic control Delay Multimedia systems

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The effects of MAC protocols on ad hoc network communication

The effects of MAC protocols on ad hoc network communication

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IEEE Conference on Wireless communications and Networking

作者： E.M. Royer Sung-Ju Lee C.E. Perkins Department of Electrical and Computer Engineering University of California Santa Barbara USA Department of Computer Science University of California Los Angeles USA Communication System Laboratory Nokia Research Center Finland

ISBN: (纸本)0780365968

As mobile computing gains popularity, the need for ad hoc routing protocols will continue to grow. There have been numerous simulations comparing the performance of these protocols under varying conditions and constraints. One question that arises is whether the choice of MAC protocol affects the relative performance of the routing protocols being studied. This paper investigates the answer to that question by simulating the performance of three ad hoc routing protocols when run over different MAC protocols. It is determined that the choice of MAC layer protocol does, in fact, affect the relative performance of the routing protocols.

关键词： Media Access Protocol Ad hoc networks Routing protocols Access protocols Mobile communication computer science Laboratories Mobile computing Computational modeling Unicast

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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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The removal of secondaries of Jawi characters

The removal of secondaries of Jawi characters

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IEEE Region 10 International Conference TENCON

作者： K. bin Omar R. bin Mahmoud M.N. bin Sulaiman A.R. bin Ramli Department of Communication and Computer SystemFaculty of Engineering Universiti Putra Malaysia Serdang Selangor Darul Ehsan Malaysia Department of Computer ScienceFaculty of Computer Science and Information Technology Universiti Putra Malaysia Serdang Selangor Darul Ehsan Malaysia Department of System Science & ManagementFaculty of Information Science and Technology Universiti Kebangsaan Malaysia Malaysia

This paper is presented to explain the steps in removing the secondary part of Jawi characters (such as dots, hamzah, and madda). The method used is based on the connected component labelling algorithm or CCLA and is added with the secondary type detection algorithm (STDA) by Bushofa and Spann (see Image and Vision Computing, vol.15, p.167-79, 1997). Several steps in the algorithm however, have been modified in order for it to be matched with the handwritten Jawi characters. Several samples of the result from the suggested algorithm are also presented. The result promises a good outcome.

关键词： computer science Character recognition Iterative algorithms Information technology Optical character recognition software Pixel Information management Technology management Information science Labeling

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All-zero-AC block detection using energy preservation theorem for H.263 video coding

All-zero-AC block detection using energy preservation theore...

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IEEE Region 10 International Conference TENCON

作者： Soong Der Chen A.R. Ramli M.R. Mukerjee Fac. of Eng. Univ. Putra Malaysia Selangor Malaysia Department of Computer and Communication System Faculty of Engineering Universiti Putra Malaysia Serdang Malaysia Universiti Putra Malaysia Serdang Selangor MY

This paper present a technique used in H.263 video coding to detect all-zero-AC occurrence without performing the transformation and quantization process. It is developed based on the energy preservation theorem. When the total AC energy in the pre-transform domain is known, the occurrence of all-zero-AC is predictable by comparing the total AC energy with the quantization threshold Q/sup 2/. The evaluations indicate that its prediction efficiency and speed gain depends on motion activities, level of Q and also the relative overhead imposed by the shortcut itself. In conclusion, the proposed new algorithm is expected to be practical in all common environments (low bit rate) targeted by H.263 standards as no negative speed gain is observed during the evaluation for all range of QP (Q=2.5QP).

关键词： Video coding Discrete cosine transforms Motion estimation Quantization Video compression Videoconference Transform coding communication systems Power engineering and energy systems engineering and theory

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Power consumption of a 2's complement adder minimized by effective dynamic data ranges

Power consumption of a 2's complement adder minimized by eff...

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IEEE International Symposium on Circuits and systems (ISCAS)

作者： R. Sheen S. Wang O.T.-C. Chen Ruey-Liang Ma Signal and Media Laboratories Department of Electrical Engineering National Chung Cheng University Chiayi Taiwan Computer System Development Department Computer & Communication Research Laboratory Industrial Technology and Research Institute Hsinchu Taiwan

Typically, two's complement is chosen to represent numbers since arithmetic operations of addition and subtraction are easy to perform. However, due to sign extension, an arithmetic operation for small dynamic data ranges may require switching power in the entire word length. Herein, we develop a two's complement adder with the dynamic-range determination and sign-extension units to reduce power consumption. According to the actual data range by minimizing sign-extension bits, only partial functional blocks of an adder are active to generate a final result of which sign bit is then extended to match the original word length. Experimental results demonstrate that our 32-bit carry-lookahead adder has 22.9% power reduction than the conventional one while dynamic ranges of input data are the Gaussian distribution with a mean of 16 bits and a standard deviation of 8 bits.

关键词： Energy consumption Dynamic range Adders communication switching Arithmetic Capacitance Power dissipation Voltage Frequency Laboratories

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Comparison of hybrid and continuous sliding mode based control algorithms 1

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IFAC Proceedings Volumes 1999年第2期32卷 2000-2005页

作者： Giorgio Bartolini Antonella Ferrara Luisa Giacomini Department of Electrical and Electronic Engineering - University of Cagliari - Piazza d'Armi - 09123 Cagliari - Italy - Tel +39-070-675.5869 - fax +39-070-675.5900 Department of Computer Engineering and Systems Science - University of Pavia - Via Ferrata 1 - 27100 Pavia - Italy Tel +39(0382)505757 - fax +39(0382)505373 Department of Communication Computer and System Sciences - University of Geneva - Via Opera Pia 13 - 16145 Genova - Italy - Tel +39(010)3532207 - fax +39(010)3532948

The term hybrid systems designates those physical processes that exhibit both continuous and discrete aspects. On the other hand, some fully continuous systems can benefit from the introduction of an inherently event-based system such as an intelligent supervisor thus becoming hybrid themselves. In the present paper, the focus is on this last class of system. More precisely, a new control approach for continuous time systems with unknown high frequency gain sign is presented relying on a logic-driven sliding mode control. Such an approach is compared with a consolidated one based on the so-called Nussbaum function .

关键词： Adaptive control uncertain high frequency gain sliding mode

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