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36th International Conference on parallel processing in Xi'an, ICPP

作者： Zhang, Yiming Li, Dongsheng Chen, Lei Lu, Xicheng National Laboratory for Parallel and Distributed Processing NUDT Department of Computer Science Hong Kong University of Science and Technology

ISBN: (纸本)076952933X

Searching in large-scale unstructured peer-to-peer networks is challenging due to the lack of effective hint information to guide queries. In this paper, we propose POP, a parallel, cOllaborative and Probabilistic search mechanism, in which query messages are viewed as search units to collaborate with each other and aggregate the distributed hints during the search process. A scheme called distributed Bloom Filter (DBF) is presented to propagate the hints with a bandwidth-aware manner, in which a node divides the received Bloom filter vector into subvectors and disseminates the fragments to its neighbors according to their bandwidth capacity. The effectiveness of POP is demonstrated through theoretical analysis and extensive simulations. © 2007 IEEE.

关键词： Bandwidth

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Scalable distributed resource information service for internet-based virtual computing environment

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Ruan Jian Xue Bao/Journal of Software 2007年第8期18卷 1933-1942页

作者： Zhang, Yi-Ming Li, Dong-Sheng Lu, Xi-Cheng National Laboratory for Parallel and Distributed Processing National University of Defense Technology Changsha 410073 China

Based on the characteristics of evolution, autonomy and diversity of Internet resources, researchers recently proposed to realize the publication and query of Internet resource information through common DHT (distributed Hash table) information services. However, current research on resource information services is insufficient in generality, usability and adaptability. Aiming at the needs of iVCE (Internet-based virtual computing environment) for resource aggregation, the SDIRIS (scalable distributed resource information service) is proposed to construct. First, the adaptive DHT (A-FissionE) infrastructure is presented, which supports to adapt to different system scale and stability transparently. Second, the MR-FissionE, which is an efficient multiple-attribute range query algorithm, is presented based on A-FissionE. Theoretical analysis and experimental results prove that SDIRIS can realize resource information publication and query efficiently.

关键词： Information services

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The detection and assessment of possible RNA secondary structure using multiple sequence alignment

Proceedings of the ACM Symposium on Applied Computing

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Proceedings of the ACM Symposium on Applied Computing 2007年 133-137页

作者： Fang, Xiaoyong Wang, Zhenghua Luo, Zhigang Yuan, Bo Ding, Fan National Laboratory for Parallel and Distributed Processing National University of Defense Technology Changsha 410073 China Department of Biomedical Informatics College of Medicine and Public Health Ohio State University Columbus OH 43210-1239 United States

ISBN: (纸本)1595934804;9781595934802

We here devise a new method for detecting and assessing RNA secondary structure by using multiple sequence alignment. The central idea of the method is to first detect conserved stems in the alignment using a special matrix and then assess them by evaluating the ratio of the signal to the noise. We tested the method on data sets composed of pairwise and three-way alignments of known ncRNAs. For the pairwise tests, our method has sensitivity 61.42% and specificity 97.05% for structural alignments, and sensitivity 42.05% and specificity 98.15% for BLAST alignments. For the three-way tests, our method has sensitivity 65.17% and specificity 97.96% for structural alignments, and sensitivity 40.70% and specificity 97.87% for CLUSTALW alignments. Our method can detect conserved secondary structures in gapped or ungapped RNA alignments. Copyright 2007 ACM.

关键词： RNA

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RAM Grid Middleware for Autonomic Cooperative Caching

RAM Grid Middleware for Autonomic Cooperative Caching

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第六届网格与协同计算国际会议(The Sixth International Conference on Grid and Cooperative Computing GCC 2007)

作者： Rui Chu Jiancong Xie Nong Xiao Xicheng Lu National Laboratory for Parallel and Distributed Processing ChangSha HuNan China

As an innovative grid computing technique for sharing the distributed memory resources in a widearea network, RAM Grid exploits the free nodes to provide remote memory for others. The data intensive applications with massive random disk IO, such as the web server or database systems, have potential benefits from RAM Grid. We analyzed the trace collected from real servers, and proposed the key issues and solution of the caching RAM Grid system for such applications,to reduce the IO overhead. Furthermore, we proposed an autonomic cooperation mechanism to improve the performance through time correlation and content redundancy detection and elimination. We have verified the effectiveness of the proposed method through comprehensive trace-driven simulations.

关键词： Middleware Cooperative caching Random access memory Read-write memory Grid computing Wide area networks Computer networks Web server Database systems Application software

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A Resource Information Management System for RAM Grid

A Resource Information Management System for RAM Grid

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第六届网格与协同计算国际会议(The Sixth International Conference on Grid and Cooperative Computing GCC 2007)

作者： Rui Chu Nong Xiao Xicheng Lu National Laboratory for Parallel and Distributed Processing ChangSha HuNan China

RAM Grid is a novel grid system to share the distributed memory resources across the wide area network, and provides disk cache for other nodes which are short of memory. The resource information management system, which monitors and manages the resources in grid environment, takes a key role for RAM Grid. Under the special requirements of RAM Grid, we propose a grid resources management system GridEye, the architecture and mechanism are also discussed. In order to improve the performance, a new caching strategy optimized for RAM Grid is *** have verified the effectiveness of the proposed method through analysis and experiments on the implemented prototype system.

关键词： Information management Read-write memory Random access memory Memory management Resource management Grid computing Sections Environmental management Prototypes Performance analysis

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A clustering model for memory resource sharing in large scale distributed system

A clustering model for memory resource sharing in large scal...

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International Conference on parallel and distributed Systems (ICPADS)

作者： Rui Chu Nong Xiao Xicheng Lu National Laboratory for Parallel and Distributed Processing ChangSha Hunan China

As an application of large scale distributed network computing system, RAM Grid tries to solve the problem of memory resource sharing and utilization. Due to the special properties of memory, traditional resource information management approaches cannot be adapted easily. This paper proposes a clustering based resource aggregating scheme under the background of RAM Grid, which can reduce the scale of resource information management efficiently. With analogy to the force field and potential energy theory in physics, the basic model, the force field-potential energy model, and the corresponding distributed algorithms are proposed, respectively. The model and algorithms are also evaluated by real network topologies based simulation.

关键词： Resource management Large-scale systems Random access memory Read-write memory Information management Computer networks distributed computing Grid computing Memory management Potential energy

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Efficient Rate Adaptation in Multi-rate 802.11 Networks

Efficient Rate Adaptation in Multi-rate 802.11 Networks

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IEEE Symposium on Computers and Communications (ISCC)

作者： Shaohe Lv Xiaodong Wang Xingming Zhou Chi Liu National Laboratory for Parallel and Distributed Processing National University of Defense Technology Changsha Hunan China

Given the multi-rate option in most 802.11 standards, rate adaptation based on dynamic channel condition is crucial to the system performance. This paper presents an efficient rate adaptation mechanism at MAC layer, called ERA, to improve the transport layer throughput. Such scheme raises the transmission rate aggressively, e.g., upon only a few consecutive successful transmissions. In opposite, we reduce the transmission rate more cautiously only when the station encounters severe consecutive frame losses or relatively high loss ratio at MAC layer. ERA also attempts to protect the performance under steady condition without losing the ability to respond to the channel variation quickly. We evaluate ERA using NS-2 simulations and find that it performs better than or at least similarly with many other proposals in various scenarios. ERA is a sender-based method and requires minor modification at sender side only, thus completely standard-compliant and very easy to be implemented and deployed.

关键词： System performance Throughput Propagation losses Protection Laboratories distributed processing Performance evaluation Proposals Physical layer Data mining

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Compositional Verification of UML Dynamic Models

Compositional Verification of UML Dynamic Models

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Asia-Pacific Conference on Software Engineering

作者： Wei Dong Ji Wang Zhichang Qi Ni Rong School of Computer National University of Defense Technology China National Laboratory for Parallel and Distributed Processing China

UML dynamic models are important for software analysis and design. Verifying UML dynamic models to find design errors earlier is a key issue for ensuring software quality. Because of the characteristics such as concurrency and hierarchy, model checking of UML Statecharts and collaboration diagrams faces the problem of state explosion. In this paper, UML Statecharts is firstly structurally expressed by hierarchical automata and its semantics for open systems is introduced. Then, the synchronization composition of objects in UML collaboration diagrams is expatiated, based on which the global system behaviors can be constructed. Based on hierarchical automata and simulation relation between semantics structures, the compositional rules for verifying concurrent object systems are proposed. It makes possible that the construction of global state space will be unnecessary in model checking of UML collaboration diagrams. The hierarchical structures of UML Statecharts are also brought into the compositional verification, which makes the model checking of implementation models can be carried out through replacing detailed components by abstract specifications.

关键词： Unified modeling language Concurrent computing Automata State-space methods Explosions International collaboration Software systems Software engineering distributed computing Laboratories

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Self-Learning Rate Adaptation in Multi-rate 802.11 Networks

Self-Learning Rate Adaptation in Multi-rate 802.11 Networks

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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： Shaohe Lv Xiaodong Wang Xingming Zhou Chi Liu National Laboratory for Parallel and Distributed Processing National University of Defense Technology Changsha Hunan China 410073

Given the multi-rate option in most 802.11 standards, rate adaptation based on dynamic channel condition is crucial to the system performance. This paper presents an efficient self-learning rate adaptation mechanism at MAC layer, called SLRA. SLRA takes both the temporal or spatial correlation and cha- nge into account. The rate selection has two steps: one is to evaluate the performance of current rate and decide whether to adjust the rate;the second is to calib- rate the decision according to the historical experiments of rate adjustment at similar channel status. We evaluate SLRA in 802.11 network and find that it can choose the right rate at most time and performs better than other sender-side adaptation schemes.

关键词： History Performance evaluation Throughput System performance Switches Transmitters Laboratories distributed processing Physical layer Robustness

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An experimental study of the emergent behaviors of self-organized agent communities

An experimental study of the emergent behaviors of self-orga...

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Congress on Evolutionary Computation

作者： Shufeng Wang Hong Zhu National Laboratory for Parallel and Distributed Processing Changsha China Department of Computing Oxford Brookes University Oxford UK

Emergent behavior is an essential feature in multi-agent systems and plays a significant role in the applications of agent technology. Because of the huge gap between individual agents' behaviors and those of the whole system, specifying and reasoning about emergent behaviors are notoriously difficult. Simulation has been the essential method to study emergent behaviors in multi-agent systems. In this paper, we report an experimental study of the emergent behaviors of self-organized agent communities, in which emergent behaviors play a crucial role. The experiments confirmed the results of a theoretical analysis of agent communities using a formal theory called scenario calculus. It further provided insight into the dynamic features of the system that were very difficult to obtain by using formal logic, such as the speed of convergence to the emergent states and the relationships between the convergence time and various parameters of self-organized agent communities systems.

关键词： Evolutionary computation

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