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2008 2nd International Symposium on systems and Control in Aerospace and Astronautics, ISSCAA 2008

作者： Su, Cai Ze Ning, Sun Li Bo, Gao Hai Cheng, Zhou Pu State Key Laboratory of Advanced Robot and System Harbin Institute of Technology Harbin 150001 Heilongjiang China School of Computer Science and Technology Harbin Institute of Technology Harbin 150001 Heilongjiang China Department of Information Engineering Artillery Academy of PLA Hefei 230031 AnHui Province China

This paper mainly discusses the pursuit-evasion games, in which a team of autonomous mobile robots act as pursuers to pursue multiple moving targets cooperatively. In order to reduce the communication load during the task negotiation process, the auction mechanism in Economics was introduced,and an improved task negotiation process based on Multi-Unit Combinatorial Auction was proposed. It allocated task dynamically through capability classification and independent competition. A kind of multi-robot cooperative pursuit algorithm that allows dynamic alliance is proposed. Simulation results show the feasibility and validity ofthe given algorithm.

关键词： Multipurpose robots

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Research the dynamical large file transmitting in optical network using lagrangian relaxation

Research the dynamical large file transmitting in optical ne...

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Network Architectures, Management, and Applications VI

作者： Wang, Hao Guoa, Wei Jina, Yaohui Suna, Weiqiang Hua, Weisheng State Key Laboratory on Fiber-Optic Local Area Networks and Advanced Optical Communication System Shanghai Jiao Tong University Shanghai 200240 P. R. China China

ISBN: (纸本)9780819473776

In today's distributed computing systems, a large amount files contain huge data need to be transferred to their destination as soon as possible or else the quality of these systems will be seriously affected, and these transfer requests arrived dynamically. We propose some effective heuristic algorithm to this problem with the purposes of minimizing the maximal file transmitting time, and we can get some primal results from the algorithm. However, as we known, the problem of routing and scheduling for the dynamic arriving files in the optical network has a large number of constrains and the exact solution is computationally expensive, so it is hard to get the optimal result about this problem and we can not know whether the heuristic results is good or how closed it closed to its optimal result. In order to get some more detail results, we apply the approach called Lagrangian relaxation combined with subgradient-based method and utility the heuristic result to compute the lower bound of the optimal solution, and we consider the optimal target of minimizing the maximal file transmitting complete time for it's an important aspect with the file transmitting problem. We mainly use Lagrangian relaxation (LR) to research the dynamical lager file transmitting problem. Firstly, in order to apply the LR method we formulation our dynamic file routing scheduling and distributing problem in WDM optical network into mathematic model with some corresponding constraints. Secondly, change the formulation with some added variables to let it more suitable for LR and then introduce the Lagrangian multipliers into the model to obtain the Lagrangian function. With this function we can divided it into some small independent problems that could let it be solved more easily and at last we utilize the result received from the heuristic algorithm to solve the Lagrangian multiplier problem with subgradient-based method in order to getting the sharpest possible lower bound. With the compariso

关键词： Heuristic algorithms

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A Novel Deterministic Quantum Communication Scheme Using Stabilizer Quantum Code

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Communications in Theoretical Physics 2008年第1期49卷 93-99页

作者： GUO Ying CHEN Zhi-Gang HUANG Da-Zu ZENG Gui-Hua Department of Communication Engineering Central South University Changsha 410063 China State Key Laboratory on Fiber-Optic Local Area Communication Networks and Advanced Optical Communication System Department of Electronic Engineering Shanghai Jia~tong University Shanghai 200030 China Department of Information Management Hunan Finance and Economics College Changsha 410205 China

Exploiting the encoding process of the stabilizer quantum code [[n, k, d]], a deterministic quantum communication scheme, in which n - 1 photons are distributed forward and backward in two-way channel, is proposed to transmit the secret messages with unconditional security. The present scheme can be implemented to distribute the secret quantum （or classical） messages with great capacity in imperfect quantum channel since the utilized code encodes k-qubit messages for each scheme run.

关键词： quantum key distribution quantum error-correction code quantum information

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Filamentation control in temperature distributed argon gas filled tube

Filamentation control in temperature distributed argon gas f...

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International Conference on Ultrahigh Intensity Lasers Development,Science and Emerging Applications(第三届超强激光科学和应用国际会议)

作者： Shiying Cao Ruxin Li Zhong Wang Zhigang Zhang Zhenming Song Yu Qin Weipeng Kong Dongqing Pang Xiaowei Chen Liwei Song Institute of Quantum Electronics State Key Laboratory of Advanced Optical Communication System and State Key Laboratory of High Field Laser Physics Shanghai Institute of Optics and Fine MechanicsCh Ultra fast Laser Laboratory School of Precision Instrument and Optoelectronics Engineering Key Lab

We presented a novel technique of controlling filamentation with temperature and conducted the experiment in the temperature gradient gas-filled tube by heating the entrance of the gas with a furnace and cooling the exit of the tube with *** experiment results show that multiple filaments can be merged into single filament by only increasing the local temperature at the beginning of the *** technique offers another degree of freedom of controlling the filamentation and opens a new way for multi-mJ level few-to-monocycle pulse generation through filamentation in rare gases.

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Per-Flow Re-Sequencing in Load-Balanced Switches by Using Dynamic Mailbox Sharing

Per-Flow Re-Sequencing in Load-Balanced Switches by Using Dy...

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IEEE International Conference on Communications (ICC)

作者： H. Cheng Y. Jin Y. Gao Y. Yu W. Hu N. Ansari State Key Laboratory on Fiber-Optic Local Area Networks and Advanced Optical Communication System Shanghai Jiaotong University Shanghai China Advanced Networking Laboratory New Jersey Institute of Technology Newark NJ USA

Load-balanced switches have received much attention because they are more scalable than other switch architectures. However, a load-balanced switch has the problem of packet mis-sequencing. In this paper, we propose a dynamic mailbox sharing (DMS) scheme to eliminate the mis-sequencing problem of load-balanced switches only at the cost of a very small increase of delay. The key idea is to keep packets of the same flow in order in the load-balanced switch. The DMS scheme is based on two statistical facts in operational networks: the number of simultaneous active flows in the router buffer is far less than that of in-progress flows, and most of the intra-flow packet intervals are longer than the packet delay in the high speed router. In DMS, the packet sequence of the same flow arrived in the input ports is recorded in the mailbox maintained in the output ports. Then, packets of the same flow are delivered according to the order of their arrivals. The mailbox becomes the bottleneck in order to accommodate a large number of flows. We thus propose a dynamic sharing scheme to alleviate the bottleneck and greatly enhance the scalability of the mailbox. By simulations using the real internet traffic traces, we show that with a simple flow splitter mechanism restraining mis-sequencing, the average packet delay using DMS is considerably lower than that of other schemes including uniform frame spreading, padded frame and the CR switch, and it is close to the ideal case without re-sequencing even when the load is very high. The results also demonstrate that the size of mailbox is in the hundreds.

关键词： Optical switches Communication switching Packet switching Delay Chromium Laboratories Optical fiber communication Optical fiber LAN Internet Communications Society

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A Lightweight execution framework for massive independent tasks

A Lightweight execution framework for massive independent ta...

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2008 Workshop on Many-Task Computing on Grids and Supercomputers, MTAGS 2008

作者： Hui, Li Huashan, Yu Xiaoming, Li Shenzhen Graduate School of Peking University Shenzhen Guangdong 518055 P.R. China Institute of Network Computing and Distributed System Peking University Beijing 100871 P.R. China State Key Laboratory of Advanced Optical Communication and Network Peking University Beijing 100871 P.R. China

ISBN: (纸本)9781424428724

This paper presents a lightweight framework for executing many independent tasks efficiently on grids of heterogeneous computational nodes. It dynamically groups tasks of different granularities and dispatches the groups onto distributed computational resources concurrently. Three strategies have been devised to improve the efficiency of computation and resource utilization. One strategy is to pack up to thousands of tasks into one request. Another is to share the effort in resource discovery and allocation among requests by separating resource allocations from request submissions. The third strategy is to pack variable numbers of tasks into different requests, where the task number is a function of the destination resource's computability. This framework has been implemented in Gracie, a computational grid software platform developed by Peking University, and used for executing bioinformatics tasks. We describe its architecture, evaluate its strategies, and compare its performance with GRAM. Analyzing the experiment results, we found that Gracie outperforms GRAM significantly for execution of sets of small tasks, which is aligned with the intuitive advantage of our approaches built in Gracie.

关键词： Resource management Distributed computing Grid computing Bioinformatics Processor scheduling Computer networks Optical computing Supercomputers Parallel processing Laboratories

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Data segments aggregation performance in next generation avionics systems

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Guangxue Xuebao/Acta Optica Sinica 2008年第SUPPL. 2期28卷 253-257页

作者： Huang, Hui He, Hao Jin, Yaohui Huang, Haoyi Wu, Jianmin State Key Laboratory on Advanced Communication Systems and Networks Shanghai Jiaotong University Shanghai 200240 China National Defense Science and Technology Key Laboratory for Avionics System Integration Technology Shanghai 200233 China

We integrate the advantages of optical packet switching (OPS) network and fibre channel (FC) technology, and put forward fibre channel transportation based on optical packet switching network (FC over OPS) as a solution for next generation avionics systems internetworking. We focus our research work on the interrelation between data segments aggregation and network real-timing performance. By simulation, we analyze the impact that bandwidth, minimum efficiency threshold and timing contribute to the network real-timing. Furthermore, we complete hardware prototype design and simulation, compare the results between software and hardware simulation and analyze the performance of this algorithm.

关键词： Packet switching

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A compact V-band planar wideband bandpass filter based on Liquid Crystal Polymer substrates

A compact V-band planar wideband bandpass filter based on Li...

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Electronics system-Integration Technology Conference, ESTC

作者： Xia Zhang Dan Kuylenstierna Johan Liu Peng Cai Cristina Andersson James Morris Herbert Zirath Department of Microtechnology and Nanoscience Chalmers University of Technology Goteborg Sweden Key Laboratory o fAdvanced Display and System Applications Ministry of Education & SMIT Center Shanghai University Shanghai China Key Laboratory of Advanced Display and System Applications Ministry of Education & SMIT Center Shanghai University Shanghai China School of Electronics Jiangxi University of Finance and Economics Nanchang China Department of Electrical & Computer Engineering Portland State University Portland OR USA

The move to higher frequencies has stimulated the development of the materials and integration techniques of the RF/microwave/millimeter (mm)-wave areas. Until now, materials commonly used at high frequency are either expensive or have inadequate performance. Liquid crystal polymers (LCPs), have attracted much more attention as advanced candidates as RF/microwave/mm-wave substrate materials for commercial wireless applications due to their combination of features and performance. In this paper, a compact V-band planar microstrip bandpass filter with sharp-rejection, low insertion-loss and wide-bandwidth based on the dual-mode ring resonator is proposed. The filter is fabricated on a LCP substrate by using standard processing technology. The proposed filter exhibits a return loss level better than 10 dB, an insertion loss of 5 dB, and a 3-dB bandwidth of 30%. The simulated and measured results are compared and agree well, which shows the promising potential of LCP laminates for flexible RF/microwave/mm-wave substrates.

关键词： Wideband Band pass filters Liquid crystal polymers Crystalline materials Radio frequency Microwave filters Resonator filters Microwave theory and techniques Microstrip filters Microstrip resonators

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Reliability and real-time assurance of fly-by-light network for flight control system

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Guangxue Xuebao/Acta Optica Sinica 2008年第SUPPL. 2期28卷 196-200页

作者： Luo, Jiarong Luo, Xuan He, Hao Jin, Yaohui Huang, Haoyi Wu, Jianmin State Key Laboratory on Fiber-Optic Local Area Network and Advanced Optical Communication Systems Shanghai Jiaotong University Shanghai 200240 China National Defense Science and Technology Key Laboratory for Avionics System Integration Technology Shanghai 200233 China

A survey is made on several traditional topologies of fly-by-light(FBL) network. Based on the comparison of their reliability and real-time performance, a mesh optical switching network topology with 256 nodes is chosen. The redundancy topology gives the ability to sustain 3 link faults, which assures the reliability of network. The seriousness of the network failure can be measured by the number of link faults. And when several link faults occur at the same time, it must also be measured by the contiguity degree among the faults. A simulation is taken to test the end-to-end latency under all network failure situations. The simulation results show that even when some serious fault occurs, the number of hops of the end-to-end route increases slightly. So it still meets the real-time communication requirements.

关键词： Flight control systems

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New design of chirped mirrors for femtosecond pulse compression

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Guangxue Xuebao/Acta Optica Sinica 2008年第SUPPL.期28卷 89-91页

作者： Wang, Xi Chen, Lingling Yang, Weijian Zhang, Zhigang State Key Laboratory of Advanced Optical Communication System and Networks School of Electronics Engineering and Computer Science Peking University Beijing 100871 China Institute of Quantum Electronics School of Electronics Engineering and Computer Science Peking University Beijing 100871 China

A novel technique of optimizing chirped mirrors is proposed. Simulation demonstrates that the residual group delay dispersion ripples of two matched chirped mirrors is less than 10 fs2 over the wavelength range of 700-1050 nm and that of three matched chirped mirrors is less than 15 fs2 over the same range. These kinds of chirped mirrors have precisely controlled group delay dispersion, which plays a critical role in the generation of ultrashort pulses and compression of few-cycle to monocycle femtosecond pulses.

关键词： Group delay

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