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作者： Jung, Keechul Kim, Kwang In Kurata, Takeshi Kourogi, Masakastu Han, JungHyun Pattern Recognition and Image Processing Lab. Michigan State Univerisity United States Artificial Intelligence Lab. KAIST Korea Republic of National Institute of Advanced Industrial Science and Technology Japan School of Electrical and Computer Engineering Sungkyunkwan University Korea Republic of

We propose a text scanner, which detects wide text strings in a sequence of scene images. For scene text detection, we use a multiple-CAMShift algorithm on a text probability image produced by a multi-layer perceptron. To provide enhanced resolution of the extracted text images, we perform the text detection process after generating a mosaic image in a fast and robust image registration method. © 2002 IEEE.

关键词： Text processing

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Gain adaptation of networked mobile robot to compensate QoS deterioration

Gain adaptation of networked mobile robot to compensate QoS ...

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Annual Conference of Industrial Electronics Society

作者： Y. Tipsuwan Mo-Yuen Chow Advanced Diagnosis and Control Lab Department of Electrical and Computer Engineering North Carolina State University Raleigh NC USA

The performance of a robot operated over a data network does not only depend on a control algorithm used, but also on network conditions. Providing network QoS (quality-of-service) to a networked robot system could significantly improve its system performances. However, the network QoS can degrade due to several factors, such as congestion and interference, and can affect the overall system performances. We propose a gain adaptation approach to compensate deteriorative changes in network QoS in order to maintain the performances of a robot system as much as possible. The approach is demonstrated by path tracking control of networked differential drive mobile robot over a QoS enabled network. The simulation results show that when the gain adaptation is applied, the robot can effectively tolerate network QoS deterioration, and increase the overall system robustness. The concept of gain adaptation can be easily extended to other network-based control applications.

关键词： Mobile robots Control systems Quality of service Delay Application software Robot control Protocols Degradation Robot sensing systems Interference

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A NEURAL COMPUTATION MODEL FOR REAL-TIME COLLISION-FREE ROBOT NAVIGATION

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IFAC Proceedings Volumes 2002年第1期35卷 323-328页

作者： Simon X. Yang Max Meng Hao Li Advanced Robotics and Intelligent Systems (ARIS) Lab School of Engineering University of Guelph Guelph ON N1G 2W1 Canada Advanced Robotics and Teleoperation (ART) Lab Department of Electrical and Computer Engineering University of Alberta Edmonton AB T6G 2G7 Canada

A biologically inspired neural computation model is proposed for dynamic planning and tracking control of robots. The dynamic environment is represented by a neural activity landscape of a topologically organized neural network, where each neuron is characterized by a shunting equation. The collision-free path is generated in real-time through the activity landscape without any prior knowledge of the dynamic environment. The real-time tracking control of robots to follow the planned path is also designed using shunting equations. The effectiveness is demonstrated through case studies. Simulation in several computer-synthesized virtual environments further demonstrates the advantages of the proposed approach.

关键词： path planning obstacle avoidance velocity control neural dynamics neural network

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Transmit power allocation for an extended V-BLAST system

Transmit power allocation for an extended V-BLAST system

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13th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2002

作者： Nam, Seung Hoon Lee, Kwang Bok i-Networking Lab. Samsung Advanced Institute of Technology P.O. Box 111 Suwon 440-600 Korea Republic of School of Electrical Engineering and Computer Science Seoul National University Kwanak P.O. Box 34 Seoul 151-742 Korea Republic of

ISBN: (纸本)0780375890

Vertical Bell laboratories Layered Space-Time (V-BLAST) is a promising system that realizes the enormous capacity of multiple-input multiple-output (MIMO) communications. In this paper, we present an extension of V-BLAST, and propose an effective transmit power allocation scheme for the extended system. The proposed transmit power allocation scheme minimizes the bit error rate (BER) averaged over all detection stages, and requires small feedback overhead from the receiver to the transmitter. Simulation results show that the extended V-BLAST system with the proposed transmit power allocation scheme provides a significant reduction in the BER compared to the conventional V-BLAST system. When the minimum mean square error (MMSE) nulling is adopted, the extended V-BLAST system is found to achieve the BER performance comparable to that of the maximum likelihood (ML) detection for the conventional V-BLAST architecture. ©2002 IEEE.

关键词： Bit error rate

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Transmitter-based processing for the down-link DS/CDMA systems with multiple transmit antennas

Transmitter-based processing for the down-link DS/CDMA syste...

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13th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2002

作者： Park, Chang Soon Lee, Kwang Bok Kim, Sung Jin School of Electrical Engineering and Computer Science Seoul National University Kwanak P.O. Box 34 Seoul 151-742 Korea Republic of i-Networking Lab. Samsung Advanced Institute of Technology Samsung P.O. Box 111 Suwon 440-600 Korea Republic of

ISBN: (纸本)0780375890

There have been various receiver-based techniques for performance improvement of wireless communications systems. However, receiver-based techniques have a restricted application in the down-link because they increase computational complexity of the mobile station (MS). In this paper, a transmitter-based processing scheme for the down-link direct-sequence code division multiple access (DS/CDMA) systems with multiple transmit antennas is proposed. Proposed scheme uses pre-rake method to exploit diversity gain and pre-decorrelating method to suppress multiple access interference (MAI) and multiple path interference (MPI). To make the total transmit power the same as that without pre-decorrelating processing, we present three power normalization methods and compare the performance of those with one another. ©2002 IEEE.

关键词： Transmitters

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An IP-centric control plane for survivable WDM mesh networks: experimental results on the OMEGA test-bed

An IP-centric control plane for survivable WDM mesh networks...

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IEEE Workshop on IP Operations and Management, (IPOM)

作者： S. Lakshmanan D.S. Shah M. Tacca A. Fumagalli A. Paradisi S.M. Rossi Optical Networking Advanced Research (OpNeAR) Lab Erik Jonsson School of Engineering and Computer Science University of Technology Dallas USA Optical Communications Division CPqD Foundation Sao Paulo Brazil

It is well known that IP over WDM is a promising and simplified network architecture for future high speed networking, in which the EP layer can be used as the control plane to manage the optical layer, in addition to providing user's data transmission functionalities. Among others, key functions of the IP control plane are the provisioning of optical circuits for end-to-end data transmission between routers and fault management. An open question is what protocols are most suitable for providing such functions. The paper describes a suite of protocols that was implemented to accomplish both optical circuit provisioning and fault management in an EP over WDM network. The protocols were implemented and tested using the /spl Omega/ (Optical Mesh network for Emerging Gigabit Applications) test-bed. Experimental results indicate good scalability properties of the implemented protocols. For example, it is possible to handle more than a hundred wavelengths with restoration times that are below few tens of milliseconds.

关键词： Wavelength division multiplexing WDM networks Mesh networks Testing High speed optical techniques Protocols Optical fiber networks Optical control Data communication Circuits

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Extended UML with Role Modeling

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Wuhan University Journal of Natural Sciences 2001年第Z1期6卷 175-182页

作者： He Ke\|qing 1, Jiang Hong 1, He Fei 2, Ying Shi 3 1 School of computer Science,Wuhan University,Wuhan 430072,China 2.Japan advanced Institute of Science and Technogy,923\|1292,Japan 3.Stae Key lab. of Software engineering, Wuhan University,Wuhan School of Computer Science Wuhan University Wuhan China Japan Advanced Institute of Science and Technogy Japan Stae Key Lab. of Software Engineering Wuhan University Wuhan China

UML is widely accepted and applied by the international software industry. UML is a powerful language for Object oriented modeling, designing, and implementing software systems, but its Use Case method for requirement analysis and modeling software patterns has some explicit drawbacks. For more complete UML, this paper proposes the Role Use Case modeling and its glyphs, and provides an instance of requirement analysis using Role Use Case method. Uses the Role Model to modeling software pattern at knowledge level. This paper also extends the UML Meta Model and accentuates “RM before UML's class Modeling”.

关键词： UML role role modeling software pattern use case

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IP traffic monitoring: An overview and future considerations 2nd

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2nd IEEE Pacific-Rim Conference on Multimedia, IEEE-PCM 2001

作者： Wei, Dong Ansari, Nirwan Advanced Networking Lab Department of Electrical and Computer Engineering New Jersey Institute of Technology University Heights NewarkNJ07102 United States

ISBN: (纸本)3540426809

An overview on emerging IP traffic monitoring is presented. Important parameters to characterize the traffic, network and QoS, are discussed. The infrastructure and methodology to measure those parameters directly or to compute them based on other measurements are described. We also present a discourse on coping with the challenge of new transport architectures and technologies. In summary, a framework of IP traffic monitoring is presented. © Springer-Verlag Berlin Heidelberg 2001.

关键词： Parameter estimation

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An adaptive segmentation scheme for the Bluetooth-based wireless channel 10

An adaptive segmentation scheme for the Bluetooth-based wire...

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10th International Conference on computer Communications and Networks, ICCCN 2001

作者： Kim, Jesung Lim, Yujin Kim, Yongsuk Ma, Joong Soo School of Computer Science and Engineering Seoul National University Seoul Korea Republic of Department of Mechanical Engineering University of Seoul Seoul Korea Republic of i-Networking Lab. Samsung Advanced Institute of Technology Suwon Korea Republic of Information and Communications University Taejon Korea Republic of

ISBN: (纸本)0780371283

Bluetooth has been regarded as a promising solution for wireless connection between hand-held devices. In Bluetooth, a message is segmented into short packets to be transmitted over different frequency bands to randomize error occurrences. There are various kinds of packets with different sizes and error-handling schemes. Since each packet type has its own performance characteristics, care must be taken in selecting a packet type. This paper proposes an adaptive method that selects the best packet type depending on the condition of the channel. One of challenging issues in the proposed scheme is how to predict the packet error rate of one packet type from another. We interpolate packet error rates of different packets based on a uniform bit error model. Based on the packet error rates obtained from the interpolation, the proposed scheme selects a packet type that leads to the best performance. We also propose a revised scheme that works even when bit errors occur in a non-uniform pattern. The proposed scheme is especially useful in a harsh environment where the bit error rate is worse than 10-4. © 2001 IEEE.

关键词： Quality of service

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Raising the dead: Extending evolutionary algorithms with a case-based memory 4

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4th European Conference on Genetic Programming, EuroGP 2001

作者： Eggermont, Jeroen Lenaerts, Tom Poyhonen, Sanna Termier, Alexandre Leiden Institute of Advanced Computer Science Leiden University Netherlands Computational Modeling Lab Brussels Free University Belgium Control Engineering Laboratory Helsinki University of Technology Finland Laboratoire de Recherche en Informatique University of Paris XI France

ISBN: (纸本)3540418997

In dynamically changing environments, the performance of a standard evolutionary algorithm deteriorates. This is due to the fact that the population, which is considered to contain the history of the evolutionary process, does not contain enough information to allow the algorithm to react adequately to changes in the fitness landscape. There- fore, we added a simple, global case-based memory to the process to keep track of interesting historical events. Through the introduction of this memory and a storing and replacement scheme we were able to improve the reaction capabilities of an evolutionary algorithm with a periodically changing fitness function. © Springer-Verlag Berlin Heidelberg 2001.

关键词： Evolutionary algorithms

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