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Numerical simulation of bridge damage under blast loads

WSEAS Transactions on Computers 2009年第9期8卷 1564-1574页

作者： Deng, Rong-Bing Jin, Xian-Long High Performance Computing Center School of Mechanical Engineering School of Mechanical Engineering No. 800 Dongchuan Road Shanghai 200240 China State Key Laboratory of Mechanical System and Vibration Shanghai Jiao Tong University School of Mechanical Engineering No. 800 Dongchuan Road Shanghai 200240 China

The numerical simulation of the structural damage of a steel truss bridge subjected to blast loading with the aid of a hydrocode is presented in this paper. A three-dimensional nonlinear finite element model of an actual bridge has been developed based on the drawing design of the Minpu II Bridge in Shanghai. The effects of mesh size on pressure distribution produced by explosions are also studied. Through the comparison between the calculation results and the experimental values, the reliability of the calculation is validated. All the process from the detonation of the explosive charge to deck crack, including the propagation of the blast wave and its interaction with the structure is reproduced. The numerical results show the damage of bridge parts and provide a global understanding of bridge under blast loads. It may be generated to supplement experimental studies for developing appropriate blast-resistant design guidelines for bridges in the future.

关键词： Trusses

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Model Analysis of Talents' Abilities and Qualities for Information-Based Entrepreneurship

Model Analysis of Talents' Abilities and Qualities for Infor...

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International Conference on Information Science and Engineering (ICISE)

作者： Delin Sun Jinyun Xue Xin Tan Peipei Liu Zhiyuan Sun Juying Yao School of Business Jiangxi Normal University Nanchang China Provincial Key Laboratory For High-Performance Computing Jiangxi Normal University Nanchang China Software Engineering Institute East China Jiao Tong University Shanghai China JiangXi Institute of Education Nanchang China

In such an age of information, the talents competent for information-based entrepreneurship not only constitute the core competitiveness of newly-established enterprises, but also are of crucial importance to the success in entrepreneurship. In a bid to form a scientific and quantitative system for the selection, cultivation, use and keeping of talents for information-based entrepreneurship, this paper summarizes the abilities and qualities essential for such talents, makes a comprehensive analysis over the talents' roles in work, and eventually proposes a model concerning the talents' abilities and qualities for information-based entrepreneurship on the basis of the previous researches.

关键词： Information analysis Innovation management Human resource management Technological innovation Construction industry Power generation economics Information technology Globalization Information science Software engineering

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Combining opportunistic routing with dynamic source routing for wireless mesh networks

Combining opportunistic routing with dynamic source routing ...

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IET International Communication Conference on Wireless Mobile and computing (CCWMC 2009)

作者： Qiang Shen Xuming Fang Sunmyeng Kim Rong He High Performance Network Lab Institute of Acoustics Chinese Academy and Sciences Beijing China Provincial Key Laboratory of Information Coding and Transmission Southwest Jiaotong University Chengdu China School of Computer and Software Engineering Kumoh National Institute of Technology Gyeongbuk South Korea

Routing in wireless mesh networks presents a great challenge due to unreliable wireless links and collisions. Recently, a new routing method, opportunistic routing (OR), is proposed to deal with them by exploiting broadcast nature of wireless networks. OR relies on the global knowledge of networks to select relays and determine priorities. In this paper, we propose a new routing scheme, OxDSR, which combines OR and dynamic source routing (DSR) and performs opportunistic transmissions with the help of the local information and the traditional route obtained by DSR. By taking the duplicates and additional wireless resource consumed by multiple ACK frames into consideration, we propose a new metric, equivalent data rate, to select and prioritize relays. Extensive simulation study shows that the proposed OxDSR is more resilient and achieves higher throughput than DSR based on the expected transmission count routing metric.

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Impact of selfish rate adaptation on the performance in IEEE 802.11-based wireless multi-hop networks

Impact of selfish rate adaptation on the performance in IEEE...

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28th International Conference on Distributed computing Systems Workshops, ICDCS Workshops 2008

作者： Li, Pei Xu, Yinlong Zhang, Chunpeng Department of Computer Science and Technology University of Science and Technology China Anhui Province High Performance Computing Key Laboratory

ISBN: (纸本)9780769531731

Multiple physical layer rates are supported in IEEE 802.11-based wireless networks, where links can adopt joint transmission power control and rate adaptation to achieve energy efficiency. This paper studies the selfish rate adaptation behavior under throughput requirement. A round-based non-cooperative game is proposed assuming there is only one link which can adjust its transmission strategy in each unit time. It is shown that there is an optimal transmission strategy for a link, and a greedy algorithm is presented to select a near-optimal transmission strategy. It is observed that scheduling order affects the feasibility and the total power consumption. To alleviate the influence of scheduling order, pricing function is introduced, which motivates selfish links to share the channel fairly and efficiently. Simulation results show the proposed approach leads to not only more feasible solutions, but also power efficiency. © 2008 IEEE.

关键词： Scheduling

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Clonal Selection Based Memetic Algorithm for Job Shop Scheduling Problems

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Journal of Bionic Engineering 2008年第2期5卷 111-119页

作者： Jin-hui Yang Liang Sun Heow Pueh Lee Yun Qian Yan-chun Liang College of Computer Science and Technology Jilin University Key Laboratory of Symbol Computation and Knowledge Engineering of Ministry of Education Changchun 130012 P. R. China Institute of High Performance Computing Singapore 117528 Singapore Department of Mechanical Engineering National University of Singapore Singapore 117576 Singapore Institute of Electric and Information Engineering Beihua University Jilin 13202 l P. R. China

A clonal selection based memetic algorithm is proposed for solving job shop scheduling problems in this paper. In the proposed algorithm, the clonal selection and the local search mechanism are designed to enhance exploration and exploitation. In the clonal selection mechanism, clonal selection, hypermutation and receptor edit theories are presented to construct an evolutionary searching mechanism which is used for exploration. In the local search mechanism, a simulated annealing local search algorithm based on Nowicki and Smutnicki＇s neighborhood is presented to exploit local optima. The proposed algorithm is examined using some well-known benchmark problems. Numerical results validate the effectiveness of the proposed algorithm.

关键词： job shop scheduling problem clonal selection algorithm simulated annealing global search local search

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Impact of Selfish Rate Adaptation on the performance in IEEE 802.11-Based Wireless Multi-Hop Networks

Impact of Selfish Rate Adaptation on the Performance in IEEE...

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International Conference on Distributed computing Systems Workshop

作者： Pei Li Yinlong Xu Chunpeng Zhang Department of Computer Science and Technology Anhui Province High Performance Computing Key Laboratory University of Science and Technology China

ISBN: (纸本)9781424431755

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Impact of Selfish Power Control on the Stability in Wireless Networks

Impact of Selfish Power Control on the Stability in Wireless...

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IEEE International Conference on Communications (ICC)

作者： P. Li Y. Xu C. Zhang Y. Hu Department of Computer Science and Technology Anhui Province High Performance Computing Key Laboratory University of Science and Technology Hefei Anhui China

Power control can help to reduce energy consumption in wireless networks, while the selfish power control of a link may affect the performance of the neighbors. This paper studies the impact of selfish power control on the stability in wireless networks where each link is under a throughput requirement. Employing the modulation scheme non-coherent frequency shift keying (NFSK), we prove that there is an optimal reception rate and a corresponding optimal transmission strategy to minimize the energy consumption for a link with fixed channel condition, and further present a transmission strategy selection algorithm for links with varying channel condition. A round-based repeated non-cooperative game is proposed, assuming that there is only one link which can adjust its transmission strategy in each unit time and the link always adopts the self-optimal strategy myopically. It is observed that this game cannot converge in some cases, since links are motivated to move transmission power from high interference durations to low interference ones. To bring the game into a steady state, a penalty function is introduced and the performance of various penalty functions is investigated. Simulation results show that heavier penalty leads to faster convergence, but has no effect on the energy consumption of the steady state.

关键词： Power control Stability Wireless networks Energy consumption Interference Steady-state Throughput Frequency modulation Frequency shift keying Convergence

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Method of examining surface cracks on monocrystalline silicon

Method of examining surface cracks on monocrystalline silico...

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作者： Fang, Fengzhou Liu, Yuchan Pei, Qingxiang Hu, Xiaotang Sate Key Laboratory of Precision Measuring Technology and Instruments Research Centre of MicroNano Manufacturing Technology Tianjin University 92 Weijin Road Tianjin 300072 China Singapore Institute of Manufacturing Technology 71 Nanyang Drive Singapore 638075 Singapore Institute of High Performance Computing Science Park II 1 Science Park Road Singapore 117528 Singapore

A new method on examining the micro cracks of monocrystalline silicon during nano indentation is proposed. It is established based on a study of the increasing rate of absorbed energy in nano indentation. This method provides a simple approach in understanding whether cracks on the silicon surfaces occur, while it is tedious in conventional method.

关键词： Silicon

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A New Alignment Algorithm to Identify Definitions Corresponding to Abbreviations in Biomedical Text

A New Alignment Algorithm to Identify Definitions Correspond...

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International Workshop on Knowledge Discovery and Data Mining (WKDD)

作者： Yun Xu ZhiHao Wang YuZhong Zhao Yu Xue Anhui Province-MOST Co-Key Laboratory of High Performance Computing and Its Application University of Science and Technology Hefei Anhui China School of Life Science University of Science and Technology Hefei Anhui China

The exploding growth of the biomedical literature presents many challenges for biological researchers. One such challenge is from the use of a great deal of abbreviations. Extracting abbreviations and their definitions accurately is very helpful to biologists and also facilitates biomedical text analysis. Among existing approaches, text alignment algorithms are simple, effective and require no training data. However, state of the art alignment algorithms could not identify the definitions of irregular abbreviations (e.g., ). We propose an algorithm analogous to pairwise sequence alignment, in which it is given a penalty score if there are two unmatched characters separately from the abbreviation and definition, and in this way some irregular abbreviations are found.

关键词： Machine learning Data mining Text mining Dynamic programming Heuristic algorithms Laboratories high performance computing Biology Text analysis Training data

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A Real-time Relaxed Garbage Collection in DSM

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电子学报(英文版) 2007年第1期16卷 7-12页

作者： WU Junmin SONG Zhenhua Anhui Province Co-Key Laboratory of High Performance Computing and Application Department of Computer Science ＆ Technology University of Science ＆ Technology of China Hefei 230027 China

Garbage collection is a memory management mechanism for automatically reclaiming garbage objects in memory. It can effectively relieve the programmers' burden and optimize the design of programs. Currently many garbage collection methods for distributed systems have been put forth as the distributed systems are more and more popular. Relaxed consistency model is a very important kind of memory consistency model in distributed system, but it is inefficiently to perform garbage collection in the Distributed shared memory system (DSM) on relaxed memory model with traditional methods. This article proposes a trace-based garbage collection algorithm for DSM system based on relaxed memory model. Our algorithm notes the references among active objects of every node in DSM system, which makes the application process and the collection process able to execute concurrently. And it makes use of the relaxed consistency model's features to reduce communication cost and response delay. Furthermore, the use of two tables insures the algorithm correct and effective. This algorithm displays its advantages of real-time and incremental, and it is proved to be correct and effective.

关键词：垃圾回收算法分布式共享存储系统实时弱一致性模型 DSM

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