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2nd International Conference on networking, Architecture, and Storage, NAS 2007

作者： Qiang, Cao Guo, Tian-Jie Xie, Chang-Sheng Key Lab. of Data Storage System Computer School of Sci. and Tech. Huazhong University of Science and Technology

ISBN: (纸本)0769529275

Storage system could provide storage space and relevant access operations including allocating storage resources to new object and reclaiming storage space occupied by released objects. Allocation and collection operations are frequent, basic and specially impact on data distribution in storage space. Contrarily, data distribution also heavily effect on performance of access operations including of allocation and collection. However, it is absent to study how above two basic operates effect on data distribution in long time running. In this paper, dynamics process of continuously allocating and collecting in linear storage space are analyzed and described. We firstly build an abstract theory model of storage system. Furthermore, the dynamics of allocating/collecting is discussed. We obtain relevant descriptive equation and prove the discrete degree of system to converge around a fixed value in both continuous and inconsecutive allocation cases. In the end, our simulation experiment also could validate academic analysis. © 2007 IEEE.

关键词： Dynamics

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MMAR:A deadlock recovery-based fault tolerant routing algorithm for mesh/torus networks

MMAR:A deadlock recovery-based fault tolerant routing algori...

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ICCCAS 2007 - International Conference on Communications, Circuits and Systems 2007

作者： Lei, Song Du, Xu Guo, Jiang Qing, Yao Key Lab of Broadband Optical Fiber Transmission and Communication Network University of Electronic Science and Technology of China Chengdu Sichuan China

ISBN: (纸本)9781424414741

In direct networks, such as mesh and torus, the switching capacity will increase as the number of components increase. But the fault probability of the network also increases with the increasing of components. This paper proposes a novel fault-tolerant algorithm, named as Minimal Misrouted Adaptive Routing (MMAR) which is based on True Fully Adaptive Routing algorithm and deadlock recovery mechanism. Due to the high adaptability, MMAR can accommodate arbitrary shaped fault models using minimal number of virtual channels in each physical link. When encountering concave fault models, MMAR minimizes the length of the misrouted path by avoiding routing the message into the irrespective holes. Simulation results show that MMAR can work efficiently and achieve favorable performance. © 2007 IEEE.

关键词： MESH networking

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On the randomness of generalized cyclotomic sequences of order two and length pq

On the randomness of generalized cyclotomic sequences of ord...

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作者： Li, Shengqiang Chen, Zhixiong Sun, Rong Xiao, Guozhen ISN National Key Lab. Xidian University Xi'an 710071 China Key Lab. of Network Security and Cryptology Fujian Normal University Fuzhou Fujian 350007 China Department of Mathematics Putian University Putian Fujian 351100 China Univ. of Electronic Science and Technology of China Chengdu Sichuan 610054 China

In this letter we introduce new generalized cyclotomic sequences of order two and length pq firstly, then we determine the linear complexity and autocorrelation values of these sequences. Our results show that these sequences are rather good from the linear complexity viewpoint. © 2007 The Institute of Electronics, Information and Communication Engineers.

关键词： Autocorrelation

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Preface

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计算机科学技术学报（英文版） 2007年第2期22卷插1-插2页

作者： Shan Wang Jian-Zhong Li Scholl of Information Key Lab Data Engineering and Knowledge EngineeringRenmin University of China Department of Computer Science and Technology Harbin Institute of Technology

Recent advances in database related applications propose many new challenges and have inspired database researchers and practitioners to further make their efforts on new database technologies.

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Influence of single-mode fiber dispersion and pulse linear chirp on direct-detection optical CDMA systems

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Journal of Optical Communications 2006年第1期27卷 20-25页

作者： An, Xiaoqiang Qiu, Kun National Key Lab Optical Fiber Transmission and Communication Network University of Electronic Science and Technology of Chaina 610054 Chengdu China

In this paper, the influence of single-mode fiber (SMF) dispersion and pulse linear chirp on direct-detection optical code-division multiple-access (OCDMA) systems is analyzed. In the analysis, optical orthogonal codes (OOCs) are employed as address sequence codes. Avalanche photodiode (APD) is selected as the system receiver. The effect of APD shot noise, bulk dark current, surface leakage current, thermal noise current and multiuser access interference (MAI) is considered. The loss of system devices is omitted. The system performance is evaluated under the assumption of optical signal power, code length and code weight are constant. The numerical results show that, if the effect of SMF dispersion is considered, the system performance, i.e., bit error rate (BER) is degradation. With pulse width decreasing and transmission distance increasing, the system performance becomes aggravation. Also, the pulse linear chirp has an important effect on the system BER performance. © by Fachvsrlag Schiele & Schön 2006.

关键词： Dispersion (waves)

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New model of gain of Er3+/Yb3+ codoped phosphate fiber

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Bandaoti Guangdian/Semiconductor Optoelectronics 2006年第4期27卷 396-398+415页

作者： Gao, Yu Yang, Ya-Pei Liu, Shuang Xue, Hui Liu, Yong-Zhi School of Optoelectronic Information University of Electronic Science and Technology of China Chengdu 610054 China Key Lab. of Broadband Optical Fiber Transmission and Communication Network University of Electronic Science and Technology of China Chengdu 610054 China

Based on the microstructures in phosphate glass, a new model to calculate gain of erbium-ytterbium co-doped fiber has been designed. The action that Yb3+ suppresses Er3+ concentration quenching is quantitatively analyzed. After having been excited with pumping light, the gain of the erbium-ytterbium co-doped phosphate glass fiber has been calculated. Comparing with the test results, they are closely fit. This model provides the numerical basis for designing the phosphate glass fiber amplifier.

关键词： Concentration quenching Effective Er3+ Erbium-ytterbium co-doping Gain

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Robust moving object segmentation in the compressed domain for H.264/AVC video stream

Robust moving object segmentation in the compressed domain f...

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25th PCS: Picture Coding Symposium 2006, PCS2006

作者： Yang, Gaobo Yu, Shengfa Zhang, Zhaoyang Network and Information Security Lab School of Computer and Communication Hunan University Changsha Hunan 410082 China School of Electronic Science and Engineering National University of Defense Technology Changsha Hunan 410073 China Key Laboratory of Advanced Displays and System Application Shanghai University Ministry of Education Shanghai 200072 China

ISBN: (纸本)300018726X

Moving object segmentation in the compressed domain plays an important role in many real-time applications, e.g. video indexing, video surveillance, etc. H.264/AVC is the up-to-date video coding standard, which employs several new coding tools and provides a different video format. In this paper, a robust spatio-temporal segmentation approach to extract moving objects in the compressed domain for H.264 video stream is proposed. Coarse moving objects are firstly extracted from the motion vector field through the MRF classification process. Spatial segmentation is based on the HT coefficient, which is used to refine the object boundary of temporal segmentation results. Fusion of spatio-temporal segmentation is based on region projection based labeling technique. Further edge refinement is performed to smooth the object boundaries. The performance of the proposed approach is illustrated by simulation carried on several test sequences. Experimental results show that the proposed approach can provide the visually similar results as by using spatial domain process with much less computational complexity.

关键词： Image segmentation

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Sun's shadow variation during the recent solar cycle 23 observed with the Tibet air shower array

Sun's shadow variation during the recent solar cycle 23 obse...

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29th International Cosmic Ray Conference, ICRC 2005

作者： Ohnishi, M. Amenomori, M. Ayabe, S. Chen, D. Cui, S.W. Danzengluobu Ding, L.K. Ding, X.H. Feng, C.F. Feng, Z.Y. Gao, X.Y. Geng, Q.X. Guo, H.W. He, H.H. He, M. Hibino, K. Hotta, N. Hu, Haibing Hu, H.B. Huang, J. Huan, Q. Jia, H.Y. Kajino, F. Kasahara, K. Katayose, Y. Kato, C. Kawata, K. labaciren Le, G.M. Li, J.Y. Lu, H. Lu, S.L. Meng, X.R. Mizutani, K. Mu, J. Munakata, K. Nagai, A. Nanjo, H. Nishizawa, M. Ohnishi, M. Ohta, I. Onuma, H. Ouchi, T. Ozawa, S. Ren, J.R. Saito, T. Sakata, M. Sasak, T. Shibata, M. Shiomi, A. Shirai, T. Sugimoto, H. Takita, M. Tan, Y.H. Tateyama, N. Torii, S. Tsuchiya, H. Udo, S. Wang, H. Wang, X. Wang, Y.G. Wu, H.R. Xue, L. Yamamoto, Y. Yan, C.T. Yang, X.C. Yasue, S. Ye, Z.H. Yu, G.C. Yuan, A.F. Yuda, T. Zhang, H.M. Zhang, J.L. Zhang, N.J. Zhang, X.Y. Zhang, Y. Zhang, Yi Zhaxisangzhu Zhou, X.X. Department of Physics Hirosaki University Hirosaki 036-8561 Japan Department of Physics Saitama University Saitama 338-8570 Japan Faculty of Engineering Yokohama National University Yokohama 240-8501 Japan Key Lab. of Particle Astrophys. Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China Department of Mathematics and Physics Tibet University Lhasa 850000 China Department of Physics Shandong University Jinan 250100 China Institute of Modern Physics South West Jiaotong University Chengdu 610031 China Department of Physics Yunnan University Kunming 650091 China Faculty of Engineering Kanagawa University Yokohama 221-8686 Japan Faculty of Education Utsunomiya University Utsunomiya 321-8505 Japan Institute for Cosmic Ray Research University of Tokyo Kashiwa 277-8582 Japan Department of Physics Konan University Kobe 658-8501 Japan Faculty of Systems Engineering Shibaura Institute of Technology Saitama 337-8570 Japan Department of Physics Shinshu University Matsumoto 390-8621 Japan Center of Space Science and Application Research Chinese Academy of Sciences Beijing 100080 China Advanced Media Network Center Utsunomiya University Utsunomiya 321-8585 Japan National Institute of Informatics Tokyo 101-8430 Japan Tokyo Metropolitan College of Aeronautical Engineering Tokyo 116-0003 Japan Shonan Institute of Technology Fujisawa 251-8511 Japan Advanced Research Institute for Science and Engineering Waseda University Tokyo 169-8555 Japan RIKEN Wako 351-0198 Japan

The Sun's shadow generated by multi-TeV cosmic-ray particles has been continuously observed with the Tibet-III air shower array in 2000 through 2004 during the active period of the Solar Cycle 23 except for winter seasons (Nov. - Feb.) when the Sun moves along the low elevation tracks. According to many observations of the activity, especially clear in the sunspot number, the Solar Cycle 23 has a dip called Gnevyshev Gap early in 2001. In the yearly variation of the Sun's shadow, it becomes faint with increasing solar activity and becomes deep with declining activity. We observed unexpected deepening of the Sun's shadow just in the year 2001 when Gnevyshev Gap appeared.

关键词： Solar energy

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Primary cosmic-ray proton and helium spectra at the knee energy region measured by the Tibet hybrid AS experiment

Primary cosmic-ray proton and helium spectra at the knee ene...

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29th International Cosmic Ray Conference, ICRC 2005

作者： Amenomori, M. Ayabe, S. Chen, D. Cui, S.W. Danzengluobu Ding, L.K. Ding, X.H. Feng, C.F. Feng, Z.Y. Gao, X.Y. Geng, Q.X. Guo, H.W. He, H.H. He, M. Hibino, K. Hotta, N. Hu, Haibing Hu, H.B. Huang, J. Huang, Q. Jia, H.Y. Kajino, F. Kasahara, K. Katayose, Y. Kato, C. Kawata, K. labaciren Le, G.M. Li, J.Y. Lu, H. Lu, S.L. Meng, X.R. Mizutani, K. Mu, J. Munakata, K. Nagai, A. Nanjo, H. Nishizawa, M. Ohnishi, M. Ohta, I. Onuma, H. Ouchi, T. Ozawa, S. Ren, J.R. Saito, T. Sakata, M. Sasaki, T. Shibata, M. Shiomi, A. Shirai, T. Sugimoto, H. Takita, M. Tan, Y.H. Tateyama, N. Torii, S. Tsuchiya, H. Udo, S. Wang, H. Wang, X. Wang, Y.G. Wu, H.R. Xue, L. Yamamoto, Y. Yan, C.T. Yang, X.C. Yasue, S. Ye, Z.H. Yu, G.C. Yuan, A.F. Yuda, T. Zhang, H.M. Zhang, J.L. Zhang, N.J. Zhang, X.Y. Zhang, Y. Zhang, Yi Zhaxisangzhu Zhou, X.X. Department of Physics Hirosaki University Hirosaki 036-8561 Japan Department of Physics Saitama University Saitama 338-8570 Japan Faculty of Engineering Yokohama National University Yokohama 240-8501 Japan Key Lab. of Particle Astrophys. Chinese Academy of Sciences Institute of High Energy Physics Beijing 100049 China Department of Mathematics and Physics Tibet University Lhasa 850000 China Department of Physics Shandong University Jinan 250100 China Institute of Modern Physics South West Jiaotong University Chengdu 610031 China Department of Physics Yunnan University Kunming 650091 China Faculty of Engineering Kanagawa University Yokohama 221-8686 Japan Faculty of Education Utsunomiya University Utsunomiya 321-8505 Japan Institute for Cosmic Ray Research University of Tokyo Kashiwa 277-8582 Japan Department of Physics Konan University Kobe 658-8501 Japan Faculty of Systems Engineering Shibaura Institute of Technology Saitama 337-8570 Japan Department of Physics Shinshu University Matsumoto 390-8621 Japan Center of Space Science and Application Research Chinese Academy of Sciences Beijing 100080 China Advanced Media Network Center Utsunomiya University Utsunomiya 321-8585 Japan National Institute of Informatics Tokyo 101-8430 Japan Tokyo Metropolitan College of Aeronautical Engineering Tokyo 116-0003 Japan Shonan Institute of Technology Fujisawa 251-8511 Japan Advanced Research Institute for Science and Engineering Waseda University Tokyo 169-8555 Japan RIKEN Wako 351-0198 Japan

A hybrid experiment was carried out to study the cosmic-ray primary composition in the 'knee' energy region. The experimental set-up consists of the Tibet-II air shower array( AS ), the emulsion chamber ( EC ) and the burst detector ( BD ) which are operated simulteneously and provides us information on the primary species. For three-year operation, we have observed 177 γ -families ( ∑Eγ 20 TeV ) accompanying air showers with the shower size Ne × 105. Using this data set and a neural network method to select proton and helium induced events, the primary proton and helium energy spectra are obtained between 1015 and 1016. The proton spectrum, thus obtained, can be expressed by a single power-law function with a differential index of -3.01 ± 0.11 and -3.05 ± 0.12 based on the QGSJET+HD and SIBYLL+HD models, respectively, which are steeper than that extrapolated from the direct observations of -2.74 ± 0.01 vin the energy range below (1014eV. Our experiment suggests that the main component responsible for making the knee structure of the all-particle spectrum is composed of nuclei heavier than helium.

关键词： Helium

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Multiwavelength searches of the Shell-like SNR G40.5-0.5

Multiwavelength searches of the Shell-like SNR G40.5-0.5

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29th International Cosmic Ray Conference, ICRC 2005

作者： Amenomori, M. Ayabe, S. Chen, D. Cui, S.W. Danzengluobu Ding, L.K. Ding, X.H. Feng, C.F. Feng, Z.Y. Gao, X.Y. Geng, Q.X. Guo, H.W. He, H.H. He, M. Hibino, K. Hotta, N. Hu, Haibing Hu, H.B. Huang, J. Huang, Q. Jia, H.Y. Kajino, F. Kasahara, K. Katayose, Y. Kato, C. Kawata, K. labaciren Le, G.M. Li, J.Y. Lu, H. Lu, S.L. Meng, X.R. Mizutani, K. Mu, J. Munakata, K. Nagai, A. Nanjo, H. Nishizawa, M. Ohnishi, M. Ohta, I. Onuma, H. Ouchi, T. Ozawa, S. Ren, J.R. Saito, T. Sakata, M. Sasaki, T. Shibata, M. Shiomi, A. Shirai, T. Sugimoto, H. Takita, M. Tan, Y.H. Tateyama, N. Torii, S. Tsuchiya, H. Udo, S. Wang, H. Wang, X. Wang, Y.G. Wu, H.R. Xue, L. Yamamoto, Y. Yan, C.T. Yang, X.C. Yasue, S. Ye, Z.H. Yu, G.C. Yuan, A.F. Yuda, T. Zhang, H.M. Zhang, J.L. Zhang, N.J. Zhang, X.Y. Zhang, Y. Zhang, Y.I. Zhaxisangzhu Zhou, X.X. Department of Physics Hirosaki University Hirosaki 036-8561 Japan Department of Physics Saitama University Saitama 338-8570 Japan Faculty of Engineering Yokohama National University Yokohama 240-8501 Japan Key Lab. of Particle Astrophys Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China Department of Mathematics and Physics Tibet University Lhasa 850000 China Department of Physics Shandong University Jinan 250100 China Institute of Modern Physics South West Jiaotong University Chengdu 610031 China Department of Physics Yunnan University Kunming 650091 China Faculty of Engineering Kanagawa University Yokohama 221-8686 Japan Faculty of Education Utsunomiya University Utsunomiya 321-8505 Japan Institute for Cosmic Ray Research University of Tokyo Kashiwa 277-8582 Japan Department of Physics Konan University Kobe 658-8501 Japan Faculty of Systems Engineering Shibaura Institute of Technology Saitama 337-8570 Japan Department of Physics Shinshu University Matsumoto 390-8621 Japan Center of Space Science and Application Research Chinese Academy of Sciences Beijing 100080 China Advanced Media Network Center Utsunomiya University Utsunomiya 321-8585 Japan National Institute for Informatics Tokyo 101-8430 Japan Tokyo Metropolitan College of Aeronautical Engineering Tokyo 116-0003 Japan Shonan Institute of Technology Fujisawa 251-8511 Japan Advanced Research Institute for Science and Engineering Waseda University Tokyo 169-8555 Japan RIKEN Wako 351-0198 Japan

Using observation data of the extended Tibet air shower array from October 2000 to September 2001, a region around the shell-like SNR G40.5-0.5 direction with the highest excess of 4.4 sigma was found using two dimension analysis method. In this article we presented some work done to understanding the nature of the G40.5-0.5 using a multiwavelength approach. In order to look for a site of the CR accelerators, a survey of the CO(J=1-0) line to G40.5-0.5 region will be conducting with the 13.7m radio telescope at Delingha, the millimeter-wave radio observatory of Purple Mountain Observatory this year.

关键词： Observatories

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