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Wireless Internet and Related Technology Developments for Multimedia Services

Wireless Internet and Related Technology Developments for Mu...

引用

2002年ieee十区计算机、通信、控制和电机工程会议

作者： Seiichi Takeuchi:Tokyo Denki University Seiichi Takeuchi:Tokyo Denki University

This paper describes the recentwireless Internet and related technologydevelopments for multimedia services. Abackbone LAN for front end LAN such asEthernet is discussed. The design concept andfundamental characteristics of SN 3500 isintroduced together with some practical systemperformance and the basic block *** services over an ADSL Ethernetand ATM network is discussed and somepractical network for ADSL for TCP/IP end-to-end mode is introduced. The high-speedcharacteristics and QoS are preserved in theATM environments over the ADSLarchitecture without changing *** evaluation is compared withthe theoretical prediction to show that in theATM environments over the ADSL architecture,the users can gain access to broadband Internetconnections and in addition, ATM over ADSLshould provide connections from remote users toany ATM backbone and also any ATMdistribution network as well as any corporate

关键词： Wireless Internet and Related Technology Developments for Multimedia Services ATM Internet

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Orientation Consistency Based Feature Extraction For Fingerprint Identification

Orientation Consistency Based Feature Extraction For Fingerp...

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2002年ieee十区计算机、通信、控制和电机工程会议

作者： Daisheng Luo Qingchuan Tao Jianzhong Long Xiaohong Wu College of Electronic Information, Sichuan University Chengdu, China, 610064

Feature extraction is one of the keytechniques in automatic fingerprint identification. Today, most offeature extractions are based on the structure analysis offingerprint ridges and valleys. The structure analysis depends onthe accuracy of image segmentation. Image segmentation is oneof the most difficult techniques in image processing. Therefore,the accuracy and correctness of the feature extraction are oftennot reliable. For this reason, we propose a method for featureextraction in fingerprint identification. In this method, theintensity gradient vector image is first generated using expandedPrewitt *** the orientation consistency of the gradientvector image is calculated. The feature points of the fingerprintsare extracted from the orientation consistency by *** method is fast, simple and accurate.

关键词： Fingerprint identification feature extraction intensity gradient orientation consistency

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A NOVEL METHOD TO CORRECT THE NONLINEARITY OF PIEZOELECTRIC SCANNER IN STM BY DNA EVOLUTION ALGORITHM

A NOVEL METHOD TO CORRECT THE NONLINEARITY OF PIEZOELECTRIC ...

引用

2002年ieee十区计算机、通信、控制和电机工程会议

作者： HUANG Ziyuan FEI Minrui School of Mechatronical Engineering & Antomation Shanghai University Shanghai 200072, China

In this paper, a new method based on DNAsoft computation is put forward to correct thenonlinearity of piezoelectric scanner in STM. DNAsoft computing, e.g. DNA evolution algorithm (***-EA), has been one of international researchinghotspots in recent few years, Based on the DNA-EAproposed by Dr. Ding Yongsheng, an elitist selectionoperation is employed to ensure the algorithm toconverge uniformly and nature mutation to strengthenits ability of searching globally. As a demonstration,we show how to correct the nonlinearity ofpiezoelectric scanner in STM. The method has theadvantage of being able to optimize the structure andparameters of nonlinear inverse model ofpiezoelectric scanner simultaneously. Finally,simulation results demonstrate that the method iseffective.

关键词： DNA-EA STM nonlinearity correction

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An Improvement of Cryptographic Key Assignment Scheme in a User Hierarchy

An Improvement of Cryptographic Key Assignment Scheme in a U...

引用

2002年ieee十区计算机、通信、控制和电机工程会议

作者： Tzer-Shyong Chen Gwo-Shiuan Huang Ching-Chu Tasi Nien-Tzu Chang Department of Information management Tunghai University Taichung Taiwan China 40744 Department and Graduate School of Computer Science and Information Engineering Da-Yeh University Graduate school of management information National Yun Lin University of Science and Technology Department and Graduate School of Computer Science and Information Engineering Da-Yeh University

This paper presents an improvement in acryptographic key assignment scheme that is proposed byKuo et al. Considering the problem of dynamic accesscontrol in a user hierarchy, such an improvement focuseson the ability to implement easily. Moreover, thisimprovement is an attempt to greatly reduce thecomputation time and the storage size required by the keygeneration and the key derivation phases in Kuo's scheme.

关键词： Access Control Cryptographic Key Assignment User Hierarchy Chinese Remainder Theorem

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Further improvement of Lagrange multiplier method for optimal bit allocation

Further improvement of Lagrange multiplier method for optima...

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2002年ieee十区计算机、通信、控制和电机工程会议

作者： Chen Yisong Wang Guoping Dong Shihai HCI & Multimedia Laboratory of Peking University,Beijing 100871, China

Dynamic programming algorithms based onLagrange multiplier method is often used for calculatingan optimal bit allocation strategy to minimize the totaldistortion given a constrained rate budget in both sourceand channel coding applications. Due to possible largequantizer set and improper initialization, the algorithmoften suffers from big computational complexity. In thispaper, a simple but efficient algorithm is presented tofurther speed up the convergence of the algorithm. Thisalgorithm can be easily implemented and then results in avery fast solving process. The experimental results showthat our new algorithm can catch the optimal solution witha speed 5～7 times faster than the original algorithm.

关键词： Bit allocation Lagrange multiplier method Dynamic programming

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PERFORMANCE EVALUATION OF A FAULT-TOLERANT IRREGULAR NETWORK

PERFORMANCE EVALUATION OF A FAULT-TOLERANT IRREGULAR NETWORK

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2002年ieee十区计算机、通信、控制和电机工程会议

作者： J.Sengupta P.K.Bansal Deptt. Comp. Sc. and Engg.Punjabi University Patiala 147002 INDIA Deptt. Comp. SC. and Engg.Thapar Institute of Engg.and Tech.Patiala 147004

In an attempt to improve the fault-tolerance ofthe Omega network, this paper examines the performanceof the proposed Theta Network (THN), and compares itwith other networks having similar characteristics. Theirregular nature of the network has the inherent advantageof advantage of improving the latency of the *** results exhibit the favorable performance ofTHN at low cost, making the reliability degrade gracefullywith time, while maintaining full-access capability over areasonably long time. We study methods for routingrequests in the presence and absence of faultycomponents in THN, where 50% of the requests pass atthe minimum path length of 2.

关键词： Latency performance reliability cost-effective

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Text Categorization Based On Concept Indexing and Principal Component Analysis

Text Categorization Based On Concept Indexing and Principal ...

引用

2002年ieee十区计算机、通信、控制和电机工程会议

作者： Huang Ke Ma Shaoping State Key Lab of Intelligent Technology and Systems, Department of Computer Science and Technology, Tsinghua University, 100084, Beijing, China

A major problem in text categorization is the highdimensionality of feature vector space, which is about tenthousands in common. To reduce the dimensionality of thespace while keeping the categorization accuracy is usefulfor improving categorization effectiveness and applyingnew categorization algorithms. Current feature selectionmethods for text categorization are partially effective inreducing dimensionality. We put forward a new algorithm,which combines algorithm of concept indexing andprincipal component analysis, for reducing *** the experiments, we find that this algorithm caneffectively reduce dimensionality without sacrificingcategorization accuracy.

关键词： ACM Text Categorization Based On Concept Indexing and Principal Component Analysis Component Concept

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POWER EFFICIENCY OF SOFTWARE RADIO BASED TURBO CODEC

POWER EFFICIENCY OF SOFTWARE RADIO BASED TURBO CODEC

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2002年ieee十区计算机、通信、控制和电机工程会议

作者： V.B.BALAMURALITHARA MOHAMMAD UMAR SIDDIQI Faculty of Engineering Multimedia University Malaysia Faculty of Engineering Multimedia University Malaysia

In this paper, we give a method ofreducing overall power consumption in softwaredefined radio （SDR） receiver for turbo coding *** codes are introduced in 3 generation mobilecommunication standards for their superior codinggain while SDR will be widely available for variouswireless commuincation applications for it'smultirate, multiband and multimode function in asingle hardware platform [1]. It is well known thatthe iterative decoder structure of turbo decoderresults in high power consumption. Here we take alook at the power consumption in Analog-to-DigitalConverter （ADC） where the number of bits（resolution） used for quantizing the signal determinethe power usage. The main objective of this paper isto provide a way to reduce the overall powerconsumption in SDR for Turbo decoder.

关键词： Turbo Code Software Defined Radio (SDR) RSD Analog to Digital Converter Cyclic Redundancy Checker

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A RECURSIVE LEAST SQUARES BLIND MULTIUSER DETECTOR FOR WIRELESS SYSTEMS

A RECURSIVE LEAST SQUARES BLIND MULTIUSER DETECTOR FOR WIREL...

引用

2002年ieee十区计算机、通信、控制和电机工程会议

作者： G.S.Biradar R.V.RajaKumar Dept of Electronics and Commnication Engineering P.D.A.College of Engg .Gulbarga-585102.India. Dept of Electronics and Electrical Communication Engg.IIT Kharagpur-721302.India

Blind multiuser detection methods suppressthe multi-access interference (MAI) in DS-CDMA systemwithout requiring the knowledge of the spreading codes ofthe different users. Conventional blind multiuser detectionmethods use typical least squares or least mean squareserror algorithm, which involves matrix inversion in theestimation algorithm. In this paper a recursive least square(RLS) algorithm is applied for blind multiuser detection inwireless system. This is shown to suppress the MAI with amuch faster convergence and tracking characteristicscompared to the least mean squares method.

关键词： LMS A RECURSIVE LEAST SQUARES BLIND MULTIUSER DETECTOR FOR WIRELESS SYSTEMS RLS

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Improved Rank Conditioned Median Filter for Removal of Impulse Noise from Images

Improved Rank Conditioned Median Filter for Removal of Impul...

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2002年ieee十区计算机、通信、控制和电机工程会议

作者： Kh.Manglem Singh Prabin K.Bora Department of Electronics and Communication Engineering Indian Institute of TechnoIogy Guwahati-78l039 India Department of Electronics and Communication Engineering Indian Institute of TechnoIogy Guwahati-78l039 India

This paper presents an improved rank-conditioned median filter, with the ability of themedian filter to remove the impulse noise and the rank conditioned median filter to preserve edgesand fine image details. The center pixel that lies outside the trimming range after ranking in therank-conditioned median algorithm may not be the corrupted pixel, but it may be a pixel on the edgeor image detail and therefore, it is further venfied if the central sample is a possible candidate forbeing an impulse by thresholding. The better performance of the new filter is demonstrated.

关键词： Improved Rank Conditioned Median Filter for Removal of Impulse Noise from Images image Filter

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