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第七届全国青年计算物理学术会议

作者：余同普 Alexander Pukhov 盛政明刘峰 Gennady Shvets Department of Physics National University of Defense Technology State Key Laboratory of High Performance Computing National University of Defense Technology Institut für Theoretische Physik I Heinrich-Heine-Universitt Düsseldorf Institut für Theoretische Physik I Heinrich-Heine-Universitt Düsseldorf Key Laboratory for Laser Plasmas(MoE) and Department of Physics Shanghai Jiao Tong University Institut für Laser-und Plasmaphysik Heinrich-Heine-Universitt Düsseldorf Department of Physics The University of Texas at Austin

By using multidimensional particle-in-cell simulations, we study the electromagnetic emission from radiation pressure acceleration of ultrathin mass-limited foils. When a circularly polarized laser pulse irradiates the foil, the laser radiation pressure pushes the foil forward as a whole. The outer wings of the pulse continue to propagate and act as a natural undulator. Electrons move together with ions longitudinally but oscillate around the latter transversely, forming a self-organized helical electron bunch. When the electron oscillation frequency coincides with the laser frequency as witnessed by the electron,betatronlike resonance occurs. The emitted x rays by the resonant electrons have high brightness, short durations, and broad band ranges which may have diverse applications.

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A scalable inline cluster deduplication framework for big data protection

A scalable inline cluster deduplication framework for big da...

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13th ACM/IFIP/USENIX International Middleware Conference, Middleware 2012

作者： Fu, Yinjin Jiang, Hong Xiao, Nong State Key Laboratory of High Performance Computing National University of Defense Technology China Department of Computer Science and Engineering University of Nebraska-Lincoln United States

ISBN: (纸本)9783642351693

Cluster deduplication has become a widely deployed technology in data protection services for Big Data to satisfy the requirements of service level agreement (SLA). However, it remains a great challenge for cluster deduplication to strike a sensible tradeoff between the conflicting goals of scalable deduplication throughput and high duplicate elimination ratio in cluster systems with low-end individual secondary storage nodes. We propose ?-Dedupe, a scalable inline cluster deduplication framework, as a middleware deployable in cloud data centers, to meet this challenge by exploiting data similarity and locality to optimize cluster deduplication in inter-node and intra-node scenarios, respectively. Governed by a similarity-based stateful data routing scheme, ?-Dedupe assigns similar data to the same backup server at the super-chunk granularity using a handprinting technique to maintain high cluster-deduplication efficiency without cross-node deduplication, and balances the workload of servers from backup clients. Meanwhile, ?-Dedupe builds a similarity index over the traditional locality-preserved caching design to alleviate the chunk index-lookup bottleneck in each node. Extensive evaluation of our ?-Dedupe prototype against state-of-the-art schemes, driven by real-world datasets, demonstrates that -Dedupe achieves a cluster-wide duplicate elimination ratio almost as high as the high-overhead and poorly scalable traditional stateful routing scheme but at an overhead only slightly higher than that of the scalable but low duplicate-elimination-ratio stateless routing approaches. © 2012 Springer-Verlag Berlin Heidelberg.

关键词： Big data

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Betatron-like resonance in ultra-intense laser mass-limited foil interaction

Betatron-like resonance in ultra-intense laser mass-limited ...

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第七届全国青年计算物理学术交流会

作者： T P Yu Z M Sheng A Pukhov Y Yin H B Zhuo YY Ma X H Xu F Q Shao C T Zhou College of Science National University of Defense TechnologyChangsha 410073People's Republic of Ch Key Laboratory for Laser Plasmas (MoE) and Department of Physics Shanghai Jiao Tong UniversityShang Institut fǖr Theoretische Physik I Heinrich-Heine-Universit(a)t Dǖsseldorf40225 DüsseldorfGermany College of Science National University of Defense TechnologyChangsha 410073People's Republic of Ch State Key Laboratory of High Performance Computing National University of Defense TechnologyChangsh Institute of Applied Physics and Computational Mathematics PO Box 8009Beijing 100088People's Repub

With the help of three-dimensional particle-in-cell simulations, we study the electron dynamics in radiation pressure acceleration of a mass-limited foil *** a mass-limited foil is irradiated by a circularly polarized laser pulse, the wing parts of the laser overtake the foil from the foil *** the laser propagation direction, electrons are significantly accelerated by the laser radiation *** the laser polarization direction, electrons are subjected to a strong radial space-charge force and oscillate in the overtaking laser *** their combined actions, electrons execute a betatron-like oscillation and a spatially helix electron bunch is thus formed.A simple analytical model is proposed for interpreting the high electron energies and large oscillating *** is shown that, when the electron oscillation frequency coincides with the laser frequency as witnessed by the electron, betatron-like resonance occurs, resulting in hundreds of MeV electron generation.

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Recent advances on apposition compound eye cameras

Recent advances on apposition compound eye cameras

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CLEO: Applications and technology, CLEO_AT 2013

作者： Song, Y.M. Xie, Y. Malyarchuk, V. Xiao, J. Jung, I. Choi, K.-J. Liu, Z. Park, H. Lu, C. Kim, R.-H. Li, R. Crozier, K.B. Huang, Y. Rogers, J.A. Department of Materials Science and Engineering Beckman Institute for Advanced Science and Technology Frederick Seitz Materials Research Laboratory and University of Illinois at Urbana-Champaign Urbana IL 61801 United States Department of Mechanical Engineering University of Colorado at Boulder Boulder CO 80309 United States Department of Mechanical Engineering Kyung Hee University Yongin-si Gyeonggi-do 446-701 Korea Republic of Department of Chemistry University of Illinois at Urbana-Champaign Urbana IL 61801 United States Institute of High Performance Computing A star 1 Fusionopolis Way #16-16 Connexis 138632 Singapore School of Engineering and Applied Sciences Harvard University Cambridge MA 02138 United States Department of Civil Engineering and Soft Matter Research Center Zhejiang University Hangzhou 310058 China State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of Technology Dalian 116024 China Department of Mechanical Engineering Northwestern University Evanston IL 60208 United States

This work presents digital cameras that resemble, both structurally and functionally, apposition-type compound eyes of daylight insect. Hemispherical imagers with 180 artificial ommatidia yield 160 degree field of vie... 详细信息

ISBN: (纸本)9781557529725

关键词： Fiber optics

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A Compact Difference Scheme for an Evolution Equation with a Weakly Singular Kernel

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Numerical Mathematics(Theory,Methods and Applications) 2012年第4期5卷 559-572页

作者： Hongbin Chen Da Xu Institute of Mathematics and Physics College of ScienceCentral South University of Forestry and TechnologyChangsha410004HunanChina Key Laboratory of High Performance Computing and Stochastic Information Processing(Ministry of Education of China) College of Mathematics and Computer ScienceHunan Normal UniversityChangsha410081HunanChina

This paper is concerned with a compact difference scheme with the truncation error of order 3/2 for time and order 4 for space to an evolution equation with a weakly singular *** integral term is treated by means of the second order convolution quadrature suggested by *** stability and convergence are proved by the energy method.A numerical experiment is reported to verify the theoretical predictions.

关键词： Evolution equation weakly singular kernel compact difference scheme stability convergence numerical experiment

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Virtual simulation of intelligent toy robot driven by the action sequence files

Virtual simulation of intelligent toy robot driven by the ac...

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2012 IEEE International Conference on Computer Science and Automation Engineering, CSAE 2012

作者： Mo, Jianqing He, Hanwu Zhang, Hong Guangdong University of Technology Guangzhou China Top Key Discipline of Computer Software and Theory in Zhejiang Provincial Colleges Zhejiang Normal University Jinhua China High Performance Computing Key Lab. in Guangdong Province Guangzhou China Guangdong SouthChina Institute Industrial Design Dongguan China

ISBN: (纸本)9781467300865

To improve efficiency of action designing for intelligent toy robot, a visual action design environment is created. Compared with the text-based action designing software, it's intuitive, good usability. With this visual environment, action sequence is created and action sequence file is automatically generated. According to the data structure of action sequence and the document structure of action sequence files, an algorithm to analysis action sequence files is put forward. Then using Eon Studio as virtual simulation development platform, the analysis to complicated action sequence files and reappearance of virtual action are realized. © 2012 IEEE.

关键词： Toys

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EaSync: A transparent file synchronization service across multiple machines

EaSync: A transparent file synchronization service across mu...

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9th IFIP International Conference on Network and Parallel computing, NPC 2012

作者： Mao, Huajian Zhang, Hang Bao, Xianqiang Xiao, Nong Shi, Weisong Lu, Yutong State Key Laboratory of High Performance Computing Changsha Hunan China National University of Defense Technology Changsha Hunan 410073 China Wayne State University 5057 Woodward Ave Detroit MI 48202 United States

ISBN: (纸本)9783642356056

In our daily life, people increasingly use multiple machines to do their daily work. As platform switching and file modification are so frequently that a way for file synchronization across multiple machines is required to make the files in synchronized. In this paper, we propose EaSync, a transparent file synchronization service across multiple machines. EaSync proposes several key technologies for file synchronization oriented service, including a timestamp based synchronization protocol, an enhanced deduplication algorithm DS-Dedup. We implement and evaluate the EaSync prototype system. As the result shown, EaSync outperforms other synchronization system in operation latency and other metrics. © IFIP International Federation for Information Processing 2012.

关键词： Synchronization

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A SCALABLE AND EFFICIENT MULTICAST SYSTEM FOR DATA CENTER

A SCALABLE AND EFFICIENT MULTICAST SYSTEM FOR DATA CENTER

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2012 IEEE 2nd International Conference on Cloud computing and Intelligence Systems

作者： Dexin Cui Guoliang Chen Yinlong Xu Gaifan Li Key Laboratory of High Performance Computing Anhui ProvinceSchool of Computer Science and TechnologyUniversity of Science and Technology of China

It is a common case in many cloud computing applications to transfer massive amount of data from a source to multiple destinations, which is usually be implemented with IP multicast. However, IP multicast is not supported in dater center, so to implement one-to-many communication in data center is an important issue. This paper addresses this problem by proposing JU, a new multicast system, which includes: 1) An application method with the topology knowledge to build and maintain multicast tree;2) A scalable approach to forward multicast packets which is not limited by hardware;3) A new TCP-friendly multicast transport protocol which makes the receivers get the packets as fast as they can. With simulation, we show that the multicast completion time of our approach is shorter than other technologies’. If IP multicast is deployed in data center without the limit, JU’s completing time is only 50% of IP multicast. We also show that our transport protocol is fair with TCP.

关键词： Multicast Data center networks Transport protocol Cloud computing

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SaPM: Switch-aware process mapping model for parallel computing

SaPM: Switch-aware process mapping model for parallel comput...

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International Conference on Application of Information and Communication Technologies (AICT)

作者： Yufei Lin Yuhua Tang Xinhai Xu State Key Laboratory of High Performance Computing School of Computer Science National University of Defense Technology ChangSha Hunan China

The problem of assigning processes of a parallel program to processors of a parallel system, namely process mapping problem, has major impact on the resulting performance. The previous works only concern about the computation and communication cost, while ignoring the process switching cost. For a large-scale and communication-intensive application, more than one process may be placed onto a same processor. When the application is running, it will take long time to switch the processes. In this paper, we propose and introduce SwitchCAL, a method to calculate the process switching cost inside a processor, into the process mapping problem. Then we propose a switch-aware process mapping model - SaPM, and integrate the SaPM model with existing process mapping algorithm to obtain optimized process mapping scheme. The experiments show that our approach has high effectiveness.

关键词： Switches Program processors Computational modeling Protocols Parallel processing Computers Benchmark testing

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Wavelength-selected photon-number-splitting attack against plug-and-play quantum key distribution systems with decoy states

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Physical Review A 2012年第3期86卷 032310-032310页

作者： Mu-Sheng Jiang Shi-Hai Sun Chun-Yan Li Lin-Mei Liang Department of Physics National University of Defense Technology Changsha 410073 P.R. China State Key Laboratory of High performance Computing National University of Defense Technology Changsha 410073 P.R. China

Any imperfections in a practical quantum key distribution (QKD) system may be exploited by an eavesdropper (Eve) to collect information about the key without being discovered. For example, without the decoy-state method, Eve can perform the photon-number-splitting (PNS) attack and get full information without introducing any perturbation, since weak laser pulses are widely used in practical systems instead of single-photon sources. However, the decoy-state method against PNS attack itself may introduce another loophole while closing the loophole of multiphoton pulses. In this paper, a fatal loophole of practical decoy-state plug-and-play QKD systems has been exploited and a wavelength-selected photon-number-splitting (WSPNS) attack scheme against plug-and-play QKD systems with the decoy-state method is proposed. Theoretical analysis shows that the eavesdropper can get full information about the key generated between the legitimate parties just like the PNS attack was performed in plug-and-play QKD systems without the decoy-state method.

关键词： WAVELENGTHS PERTURBATION (Quantum dynamics) PHOTONS QUANTUM theory DISTRIBUTION (Probability theory) INFORMATION theory LASER pulses

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