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第三届IEEE无线通讯、网络技术暨移动计算国际会议

作者： Jiang Ji Kaizhi Huang Liang Jin National Digital Switching System Engineering & Technological R&D Center Zhengzhou China National Digital Switching System Engineering & Technological R&D Center Zhengzhou China

The paper presents a power control compensation method in the forward channel for the higher system capacity of the future Multi-Service hierarchical CdMA system. This method is mainly based on the confidence level and the estimation theory. The estimation has two steps, the channel fading estimation and the Mobile Station (MS) traffic amount estimation. The simulating results prove that it is better than the traditional power control methods by the great reduction of outage probability about 15％.

关键词： CdMA the multi-service hierarchical system power control compensation confidence level

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Communication Optimization Algorithms based on Extend data Flow Graph

Communication Optimization Algorithms based on Extend Data F...

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ACIS International Conference on Software engineering, Artificial Intelligence, Networking, and Parallel/distributed Computing (SNPd)

作者： Xue-rong Gong rong-cai Zhao Lin-sheng Lu National Digital Switching System China National Digital Switching System Engineering &Technological R&D Center Zhengzhou CHINA Jiangnan Institute of Computing Technology China

reducing communication overhead is extremely important for parallelizing compiler to generate efficient codes for distributed memory machines. In this paper, a redundant parallel execution model (rPEM) is used as the model for target programs. The extend data flow graph is introduced, and optimization algorithms based on the data-flow analysis are discussed. The overhead of data flow analysis can be reduced by performing analysis on the extend dataflow graph. The analysis helps to reduce the redundant communication overhead. These optimization algorithms are able to perform inter-loop and inter-procedure analysis. Experimental results prove that these optimizations algorithms are effective in reducing both the number of communications and the communication volume.

关键词： Flow graphs data analysis Algorithm design and analysis doped fiber amplifiers data flow computing Performance analysis distributed computing Optimizing compilers Concurrent computing Communication system control

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dESIGN ANd IMPLEMENTATION OF SINGLE-BUFFErEd rOUTErS

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Journal of Electronics(China) 2007年第4期24卷 470-476页

作者： Hu Ximing Qu Jing Wang Binqiang Wu Jiangxing National Digital Switching System Engineering ＆ Technological R＆D Center （ NDSC） No. 783 P.O. Box 1001 Zhengzhou 450002 China Institute of Telecommunication Engineering Air Force Engineering University No.1 Fenggao Road Xi＇ an 710077 China

A Single-Buffered （SB） router is a router where only one stage of shared buffering is sandwiched between two interconnects in comparison of a Combined Input and Output Queued （CIOQ） router where a central switch fabric is sandwiched between two stages of buffering. The notion of SB routers was firstly proposed by the High-Performance Networking Group （HPNG） of Stanford University, along with two promising designs of SB routers： one of which was Parallel Shared Memory （PSM） router and the other was distributed Shared Memory （dSM） router. Admittedly, the work of HPNG deserved full credit, but all results presented by them appeared to relay on a Centralized Memory Management Algorithm （CMMA） which was essentially impractical because of the high processing and communication complexity. This paper attempts to make a scalable high-speed SB router completely practical by introducing a fully distributed architecture for managing the shared memory of SB routers. The resulting SB router is called as a Virtual Output and Input Queued （VOIQ） router. Furthermore, the scheme of VOIQ routers can not only eliminate the need for the CMMA scheduler, thus allowing a fully distributed implementation with low processing and commu- nication complexity, but also provide QoS guarantees and efficiently support variable-length packets in this paper. In particular, the results of performance testing and the hardware implementation of our VOIQ-based router （NdSC~ Sr1880-TTM series） are illustrated at the end of this paper. The proposal of this paper is the first distributed scheme of how to design and implement SB routers publicized till now.

关键词： Single-Buffered （SB） router distributed Shared Memory （dSM） Parallel Shared Memory （PSM） Virtual Output and Input Queued （VOIQ） NdSC Sr1880-T^TM router

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Performance Analysis of 2-d-rAKE receivers with Imperfect Channel Estimation in Nakagami Fading Channels

Performance Analysis of 2-D-RAKE Receivers with Imperfect Ch...

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第三届IEEE无线通讯、网络技术暨移动计算国际会议

作者： Kaizhi Huang Jiangxing Wu National Digital Switching System Engineering & Technological R&D Center Zhengzhou 450002 China

In this paper, the closed-form expressions of signal-to-interference-plus-noise ratio (SINr) and the bit error rate (BEr) are derived for a maximal ratio combining (MrC) two-dimensional (2-d)-rAKE receiver with imperfect channel estimation in frequency-selective Nakagami fading channels. The impact of doppler frequency shift, the low pass filters (LPF) and the spatial-temporal diversity on the channel estimation and the performance of the receiver has been analyzed. Theoretical analysis and computer simulation results indicate that the performance degradation of 2-d-rAKE receivers due to imperfect channel estimation can be improved by using appropriate LPF taps and increasing the antenna numbers.

关键词： Channel estimation error (CEE) 2-d-rAKE receiver Bit error rate (BEr) doppler frequency shift Low pass filters

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detecting and Solving Links Overlap to Make Structured P2P Network Topology-Aware

Detecting and Solving Links Overlap to Make Structured P2P N...

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International Conference on Communications and Networking in China (CHINACOM)

作者： Jing Yu XiaoZhuo Gu BinQiang Wang Technological R&D Center National Digital Switching System Engineering and Technological Research and Development Center Zhengzhou Henan China

Mismatching between overlay and physical network in structured P2P system leads to overlap of links crossed on backbone network, thus it brings link waste and congestion. A method used for detecting and resolving the link overlap problem is proposed in this paper. It introduces TTL as the measurement of distance, and adjusts the routing table of node according to redirect message achieved from TTL calculation and comparison. This method is protocol- independent and easy to be built on any structured P2P system. It avoids the inaccuracy problem that the time latency or IP information method contained. Through illustration, it is proved to indeed decrease the number of links crossed in routing procedure, thus resolves the waste of link bandwidth and useless flow over the backbone network brought by mismatching problem.

关键词： routing delay Network topology Spine Bandwidth switching systems systems engineering and theory research and development Electronic mail Stress

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Large-scale growth of single-walled carbon nanotubes using cold-wall chemical vapor deposition

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Journal of Vacuum Science and technology B: Microelectronics and Nanometer Structures 2007年第6期25卷 1842-1846页

作者： Shin, K.Y. Lee, C.T. Kao, J.S. Kei, C.C. Chang, C.M. Hsiao, C.N. Liang, J.H. Leou, K.C. Tsai, C.H. Department of Engineering and System Science National Tsing Hua University 101 Kuang Fu Road Hsinchu 30013 Taiwan Instrument Technology Research Center National Applied Research Laboratories Hsinchu Science Park 20 R and D Rd. VI Hsinchu 300 Taiwan Center of Nano-Science and Technology University System of Taiwan 101 Kuang Fu Road Hsinchu 30013 Taiwan

Carbon nanotubes have been considered as an alternative material for next generation nanoelectronic devices, such as the carbon nanotube field-effect transistor (CNT-FET) or nanosensor. Large-scale growth of single-walled carbon nanotubes (SWNTs) is particularly essential to the fabrication of the CNT-FET on a full wafer. In this study, SWNTs grown at designated positions on broken pieces in a conventional thermal furnace chemical vapor deposition (CVd) system and on a 4-in. full size silicon wafer in a cold-wall thermal CVd were compared. The distinct characteristics of SWNTs grown by the two systems are explained by the differences in the temperature distribution and the gas flow pattern, and their interplay with the catalysis and the feedstock gas decomposition. The adoption of cold-wall CVd process provides a simple method, but an essential step, toward commercial applications of SWNT-based devices. © 2007 American Vacuum Society.

关键词： Single-walled carbon nanotubes (SWCN)

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Adaptive Step Length Estimation Algorithm Using Low-Cost MEMS Inertial Sensors

Adaptive Step Length Estimation Algorithm Using Low-Cost MEM...

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IEEE Sensors Applications Symposium, SAS

作者： S. H. Shin C. G. Park J. W. Kim H. S. Hong J. M. Lee Navigation Electronic System Laboratory School of Mechanical and Aerospace Engineering Seoul National University Seoul South Korea School of Mechanical and Aerospace Engineering Seoul National University Seoul South Korea Advanced Technology Lab Telecommunication R&D Center Telecommunication Network Electronics Corporation Limited Suwon South Korea

In this paper we introduce a MEMS based pedestrian navigation system (PNS) which consists of the low cost MEMS inertial sensor. An adaptive step length estimation algorithm using the awareness of the walk or run status is presented. Future u-Health monitoring systems will be essential equipment for mobile users under the ubiquitous computing environment. It is well known that the cost of energy expenditure in human walk or run changes with the speed of movement. Also the accurate walking distance is an important factor in calculating energy expenditure in human daily life. In order to compute the walking distance precisely, the number of occurred steps has to be counted exactly and the step length should be exactly estimated as well. However the step length varies considerably with the movement's speed and status. Therefore, we recognize the movement status such as walk or run of a pedestrian using the small-sized MEMS inertial sensors. Based on the result, a step length is estimated adaptively. The developed method can be applied to PNS and health monitoring mobile system.

关键词： Micromechanical devices Costs Monitoring Humans Legged locomotion Navigation Sensor systems Mobile computing Ubiquitous computing Pervasive computing

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Correction of random and Outburst Error in Facsimile MMr Code

Correction of Random and Outburst Error in Facsimile MMR Cod...

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2006 8th International Conference on Signal Processing

作者： Zhihong ding Lizhu Liu Meijun Fan Yunrong Chen National Digital Switching System Engineering & Technological R&D Center(NDSC)

ISBN: (纸本)0780397371

Extended 2 dimensional MMr Code is a kind of facsimile signal source *** relativity is utilized when MMr Code is *** addition,there is no line synchronized code in MMr *** when an error occurs,the bitstream cannot be decoded after the error *** prevent error diffusion in MMr codingjhis paper introduces a method:moving window error-correcting arithmetic which can partly correct some random and outburst errors.

关键词： MMr Correction of random and Outburst Error in Facsimile MMr Code

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Hierarchical access control for secure group communication

Hierarchical access control for secure group communication

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2006 7th International Conference on Computer-Aided Industrial design and Conceptual design, CAIdC

作者： Song, Zong-Yu Chen Jin, Zhang National Digital Switching System Engineering and Technological R and D Center ZhengZhou 450002 China

ISBN: (纸本)1424406838

Aceess control is a fundamental concern in any system that manages resource. In particular, the dynamical distributed access control problem is very difficult and does not have easy solutions. In this paper, we provide solutions by limiting the problem's domain and propose a simple, yet efficient dynamic hierarchical access control schemes: a Chinese remainder Theorem based hierarchical access scheme for secure group communications. We also propose an improved scheme for recent attacks.

关键词： Access control

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J/ψ Production in sNN=200 GeV Cu+Cu Collisions

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Physical review Letters 2008年第12期101卷 122301-122301页

作者： A. Adare S. Afanasiev C. Aidala N. N. Ajitanand Y. Akiba H. Al-Bataineh J. Alexander K. Aoki L. Aphecetche r. Armendariz S. H. Aronson J. Asai E. T. Atomssa r. Averbeck T. C. Awes B. Azmoun V. Babintsev G. Baksay L. Baksay A. Baldisseri K. N. Barish P. d. Barnes B. Bassalleck S. Bathe S. Batsouli V. Baublis A. Bazilevsky S. Belikov r. Bennett Y. Berdnikov A. A. Bickley J. G. Boissevain H. Borel K. Boyle M. L. Brooks H. Buesching V. Bumazhnov G. Bunce S. Butsyk S. Campbell B. S. Chang J.-L. Charvet S. Chernichenko J. Chiba C. Y. Chi M. Chiu I. J. Choi T. Chujo P. Chung A. Churyn V. Cianciolo C. r. Cleven B. A. Cole M. P. Comets P. Constantin M. Csanád T. Csörgő T. dahms K. das G. david M. B. deaton K. dehmelt H. delagrange A. denisov d. d’Enterria A. deshpande E. J. desmond O. dietzsch A. dion M. donadelli O. drapier A. drees A. K. dubey A. durum V. dzhordzhadze Y. V. Efremenko J. Egdemir F. Ellinghaus W. S. Emam A. Enokizono H. En’yo S. Esumi K. O. Eyser d. E. Fields M. Finger M. Finger, Jr. F. Fleuret S. L. Fokin Z. Fraenkel J. E. Frantz A. Franz A. d. Frawley K. Fujiwara Y. Fukao T. Fusayasu S. Gadrat I. Garishvili A. Glenn H. Gong M. Gonin J. Gosset Y. Goto r. Granier de Cassagnac N. Grau S. V. Greene M. Grosse Perdekamp T. Gunji H.-Å. Gustafsson T. Hachiya A. Hadj Henni C. Haegemann J. S. Haggerty H. Hamagaki r. Han H. Harada E. P. Hartouni K. Haruna E. Haslum r. Hayano M. Heffner T. K. Hemmick T. Hester X. He H. Hiejima J. C. Hill r. Hobbs M. Hohlmann W. Holzmann K. Homma B. Hong T. Horaguchi d. Hornback T. Ichihara K. Imai M. Inaba Y. Inoue d. Isenhower L. Isenhower M. Ishihara T. Isobe M. Issah A. Isupov B. V. Jacak J. Jia J. Jin O. Jinnouchi B. M. Johnson K. S. Joo d. Jouan F. Kajihara S. Kametani N. Kamihara J. Kamin M. Kaneta J. H. Kang H. Kanou d. Kawall A. V. Kazantsev A. Khanzadeev J. Kikuchi d. H. Kim d. J. Kim E. Kim E. Kinney A. Kiss E. Kistenev A. Kiyomichi J. Klay C. Klein-Boesing L. Kochenda V. Kochetkov B. Komkov M. Konno d. Kotchetkov A. Kozlov A. Král A. Kravitz J. Kubart G. J. Kunde N. Kuri University of Colorado Boulder Colorado 80309 USA Joint Institute for Nuclear Research 141980 Dubna Moscow Region Russia Columbia University New York New York 10027 and Nevis Laboratories Irvington New York 10533 USA Chemistry Department Stony Brook University SUNY Stony Brook New York 11794-3400 USA RIKEN The Institute of Physical and Chemical Research Wako Saitama 351-0198 Japan RIKEN BNL Research Center Brookhaven National Laboratory Upton New York 11973-5000 USA New Mexico State University Las Cruces New Mexico 88003 USA Kyoto University Kyoto 606-8502 Japan SUBATECH (Ecole des Mines de Nantes CNRS-IN2P3 Université de Nantes) BP 20722-44307 Nantes France Brookhaven National Laboratory Upton New York 11973-5000 USA Laboratoire Leprince-Ringuet Ecole Polytechnique CNRS-IN2P3 Route de Saclay F-91128 Palaiseau France Department of Physics and Astronomy Stony Brook University SUNY Stony Brook New York 11794 USA Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA IHEP Protvino State Research Center of Russian Federation Institute for High Energy Physics Protvino 142281 Russia Florida Institute of Technology Melbourne Florida 32901 USA Dapnia CEA Saclay F-91191 Gif-sur-Yvette France University of California-Riverside Riverside California 92521 USA Los Alamos National Laboratory Los Alamos New Mexico 87545 USA University of New Mexico Albuquerque New Mexico 87131 USA PNPI Petersburg Nuclear Physics Institute Gatchina Leningrad region 188300 Russia Saint Petersburg State Polytechnic University St. Petersburg Russia Yonsei University IPAP Seoul 120-749 Korea KEK High Energy Accelerator Research Organization Tsukuba Ibaraki 305-0801 Japan University of Illinois at Urbana-Champaign Urbana Illinois 61801 USA Vanderbilt University Nashville Tennessee 37235 USA Georgia State University Atlanta Georgia 30303 USA IPN-Orsay Universite Paris Sud CNRS-IN2P3 BP1 F-91406 Orsay France ELTE Eötvös Loránd University H-1117 Bu

Yields for J/ψ production in Cu+Cu collisions at sNN=200 GeV have been measured over the rapidity range |y|<2.2 and compared with results in p+p and Au+Au collisions at the same energy. The Cu+Cu data offer greatly improved precision over existing Au+Au data for J/ψ production in collisions with small to intermediate numbers of participants, in the range where the quark-gluon plasma transition threshold is predicted to lie. Cold nuclear matter estimates based on ad hoc fits to d+Au data describe the Cu+Cu data up to Npart∼50, corresponding to a Bjorken energy density of at least 1.5 GeV/fm3.

关键词： Colliding beam accelerators

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