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New algorithm for minimum delay overlay multicast tree

Jisuanji Gongcheng/computer engineering 2005年第14期31卷 4-6页

作者： Wu, Jiagao Jiang, Aiquan Ye, Xiaoguo Department of Computer Science and Engineering Key Laboratory of Computer Network and Information Integration Southeast University Nanjing 210096 China

This paper studies the problem of degree constrained minimum radius (DCMR) spanning tree in overlay multicast routing. A new heuristic greedy routing algorithm called degree-delay compact tree (DDCT), which is based on both degree constraints-delay integration and application layer topology optimum strategies, is proposed. The simulation results show that, comparing with similar algorithm having the same computing time complexity, the DDCT algorithm presents better performance all in radius, cost and link's reduplicate packages of the overlay multicast tree.

关键词： DCMR Overlay multicast Routing algorithm

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A low-power CMOS power amplifier for ultra wideband (UWB) applications

A low-power CMOS power amplifier for ultra wideband (UWB) ap...

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： S. Jose Hyung-Jin Lee Dong Ha S.S. Choi Department of Electrical and Computer Engineering Virginia Technology Blacksburg VA USA Wireless Home Network Research Team Digital Home Research Division Electronics and Telecommunications Research Institute Daejeon South Korea

This paper presents the design and implementation of a wideband power amplifier for UWB applications, covering the lower band frequencies of 3.1 GHz to 4.8 GHz. To achieve sufficient linearity and efficiency, this PA operates in the class-AB regime, delivering an output power of -4.2 dBm at an input 1 dB compression point of -22 dBm for a 4 GHz signal. This PA has a differential input and a single-ended output that has been matched to 50 /spl Omega/ at both ends. Complete design and implementation was done using TSMC 0.18 /spl mu/m CMOS technology and it consumes a very low power of 25 mW, while realizing a flat gain of 19/spl plusmn/1 dB across the whole band of operation.

关键词： Broadband amplifiers Ultra wideband technology CMOS technology Circuits Radiofrequency amplifiers Radio frequency Feedback Application software Transceivers Energy consumption

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Comparison of two different approaches to detect perceptual noise for mpeg-4 aac

Comparison of two different approaches to detect perceptual ...

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5th Pacific Rim Conference on Multimedia, PCM 2004

作者： Yu, Cheng-Hsun You, Shingchern D. Network Video Business Unit AVerMedia Technologies Inc 7-10F 135 Jian-Yi Rd. Chung-Ho cityTaipei Hsien Taiwan Department of Computer Science and Information Engineering National Taipei University of Technology 1 Sec. 3 Chung-Hsiao East Rd Taipei106 Taiwan

ISBN: (纸本)9783540239772

The MPEG-4 AAC introduces a new tool called Perceptual Noise Substitution (PNS) whose function is to use locally generated noise to replace the noise inside the coded music. The key issue to the PNS tool relies on the correctly detect the perceptual noise. In this paper, we point out the potential problem of the approach suggested in the ISO’s document and compare it with the other approach, proposed by the original contributors of the PNS concept, and discuss their relative performance. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Motion Picture Experts Group standards

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Authenticated public-key encryption based on elliptic curve

Authenticated public-key encryption based on elliptic curve

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International Conference on Embedded Software and Systems

作者： Yiliang Han Xiaoyuan Yang Yupu Hu Key Laboratory of Network and Information Security A.P.FDepartment of Electronic Technology Engineering College of A. P. F Xi'an China College of Computer Science Xidian University Xi'an China

An efficient scheme so called authenticated public key encryption that performs signature and encryption simultaneously is designed. The scheme is the first scheme that based on the standardized signature algorithm ECDSA and achieves both privacy and authenticity in the method of ECDLP which is the most practical cryptographic primitive in the future. The scheme saves 78%-82% computation costs in all. It also saves 14% storage costs for current security parameters and 9% storage costs for high level security in average. The saving is significant potentially, especially in power restricted applications such as embedded systems and mobile computing. Arguments show that the scheme is secure at present. Compared with RFC1421 and existed results, the scheme for multiple users also discussed.

关键词： Public key Elliptic curves Secure storage Costs Power system security Privacy Public key cryptography Elliptic curve cryptography Computational efficiency Embedded system

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Performance Comparison of TCP Traffic over Mobile IPv4 and IPv6 networks and a Mobile network Deployment Approach

Performance Comparison of TCP Traffic over Mobile IPv4 and I...

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International Conference on computer and Information Technology (CIT)

作者： Sujeong Chang Jaehyung Park Yonggwan Won Mijeong Yang Min Young Chung Department of Electronics Computer and Information Engineering Chonnam National University Gwangju South Korea Routing S/W Team Broadband Converged Network Research Division Electronics and Telecommunications Research Institute Daejeon South Korea School of Information Communication Engineering Sungkyunkwan University South Korea

ISBN: (纸本)076952432X

In order to help ISPs to deploy a mobile IP network into current Internet environment with satisfying users' mobility requirements, this paper evaluates and compares the performance of MIPv4 and MIPv6 networks. This paper shows that TCP performance in MIPv6 network outperforms that of MIPv4 network in terms of amount of dropped packets and lasting the connection with mobile node and corresponding node. And so, in this paper, we design a simple deployment approach, which all mobile node operates in MIPv6 networks under fixed IPv4 network environments

关键词： Telecommunication traffic Web and internet services Protocols IP networks Mobile computing TCPIP Traffic control computer networks Next generation networking Routing

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Integrating wireless technology in pocket electronic dictionary to enhance language learning

Integrating wireless technology in pocket electronic diction...

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International Conference on Advanced Learning Technologies (ICALT)

作者： Jen-Kai Liang Tzu-Chien Liu Hsue-Yie Wang Tak-Wai Chan Department of Computer Science and Information Engineering National Central University Taiwan Graduate Institute of Learning and Instruction National Central University Taiwan Graduate Institute of Network Learning Technology National Central University Taiwan

We believe that with regard to the information technology applications in education, one student one computing device is the future and long-term trend. Many related studies on learning systems have been carried out, from applying the simplest functions of the remote controller to the very powerful capabilities of the tablet PC. Based on this research spectrum, this paper focuses on the improvement of the pocket electronic dictionary, which is a very popular personal device among students to facilitate English learning, to serve as an individual's learning device called English learning mobile device (ELMD). From using it simply to learn English, its functions are expanded to provide interactions in the classroom. At the same time taking into account the teachers and parents' participation to form a completed English learning scenario. Thus, a learning-centered, class-centered, and interactive-centered wireless technology enhanced language learning environment could be realized in ordinary classroom.

关键词： Dictionaries computer networks Portable computers Personal digital assistants computer aided instruction computer displays Intelligent networks computer science Educational technology Information technology

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Development of ground penetration radar using impulse technology

Development of ground penetration radar using impulse techno...

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Asia-Pacific Conference on Microwave

作者： Young-Kyung Jeong Moon-Que Lee Young-Jin Park Kwan-Ho Kim Dong-Gi Youn Young-Chul Rhee Department of Electrical and Computer Engineering University of Seoul Seoul South Korea Power Telecommunication Network Korea Electrotechnology Research Institute Euiwang Gyeonggi South Korea Ultra Technology Company Limited Seoul South Korea Information and Communication Engineering KyungNam University Gyeongsangnam South Korea

ISBN: (纸本)078039433X

We developed ultra-wideband impulse type ground penetrating radar (UWB-GPR) system with 100-300MHz frequency band at -10dB bandwidth. The prototype of the system was tested in real environment and 2D visualization of raw data was achieved. Experimental results show that UWB-GPR system has a good ability in detecting for buried metal objects between 0.5m and 3m depth under ground in domestic field.

关键词： Ground penetrating radar Transmitting antennas Receiving antennas Frequency Electromagnetic scattering Radar antennas Dipole antennas Ultra wideband antennas Data visualization EMP radiation effects

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The analysis of CLOS guidance law in TVM missile terminal interception

Chung Cheng Ling Hsueh Pao/Journal of Chung Cheng Institute ...

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Chung Cheng Ling Hsueh Pao/Journal of Chung Cheng Institute of Technology 2005年第1期34卷 1-16页

作者： Chao, Chia-Chi Lee, Sou-Chen Soong, Chen-Yaw Department of Weapon System Engineering Chung Cheng Institute of Technology National Defense University Taiwan Department of Computer Information and Network Engineering Lunghwa University of Science and Technology Taiwan

In this paper, it discuss the analytical method of ATBM interception via TVM (Tracking Via Missile), it use the modified CLOS(Command to Line of Sight) in the terminal phase. The major difference between conventional CLOS is observation (Reference) point, which is changed from the ground to seeker "lock-on" position in collision course. The second difference occur in the constant P, which is the ratio of speed of missile and target, the value is decreased from 1.5 to 0.7-0.5 and form as a head-on collision. It also give a rigorous study for some methods of CLOS, such as Locke method, Jalali-Naini method and Wen's method, to make some refining results. Under some assumption, the paper give a prediction for the best lock-on point, and the angle of lock-on, it can obtain a collision with the most accurate and the best energy consumption in the interception course.

关键词： CLOS (Command to Line of Sight) Jalali-Naini method Locke method Wen's method

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The research of integrating Gyroscope-free inertial navigation system and GPS

Chung Cheng Ling Hsueh Pao/Journal of Chung Cheng Institute ...

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Chung Cheng Ling Hsueh Pao/Journal of Chung Cheng Institute of Technology 2005年第1期34卷 283-297页

作者： Hung, Chao-Yu Fang, Chun-Min Wang, Chen-Yu Lee, Sou-Chen Tuan, Pan-Chio Department of Weapon System Engineering Chung Cheng Institute of Technology National Defense University Taiwan Department of Computer Information and Network Engineering Lunghwa University of Science and Technology Taiwan

The Gyroscope-free inertial navigation system can measure the direction, velocity and position of a vehicle after a suitable configuration and mechanization. Because of system error effect, the navigation error of a Gyroscope-free INS is deeply affected by the time influence. This paper presents three important research issues. The first is the navigation equations of a Gyro free (six-accelerometer) INS that is based on the tangent-plane coordinate. The second is error equations of the proposed strap-down six-accelerometer INS. The third is a novel method for the integration of the six-accelerometer INS and the GPS. A superior result of simulation is found that the integrated INS/GPS can possess a more accurate navigation error, it almost have two orders less than conventional INS. The novel method of integrating six-accelerometer INS and GPS would be considered in auto-pilot and UAV design for the future application.

关键词： Error equation INS Kalman filter Strap-down

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China＇s Call Center Development Strategy

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Chinese Business Review 2005年第2期4卷 23-27页

作者： Zhenji Zhang Mincong Tang Honglu Liu Department of Information Management of Beijing Jiaotong University and commissioner of China Computer Network Application Association Department of Information Management School of Economics and Management of Beijing Jiaotong University Beijing China100044 Ph.D. of Moscow Railway Engineering University of Russia postdoctor of MREU associate prof. of School of Computer Science of Beijing Jiaotong University

Call center technology has been widely used in China, including industries of banking, railway, telecommunication, electron, insurance, and so on. But the actual effects and benefits brought by adoption of call center are really poor. This paper analyzes the situation of call center＇s adoption in several major industries in China and also analyzes the existing problems, From the point of view of strategies of enterprises and call center, this paper puts forward a set of strategic and theoretical suggestions for call center development in China.

关键词： call center China development strategy

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