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Journal of Software 2010年第2期5卷 206-213页

作者： Li, Dingding Jin, Hai Shao, Yingzhe Liao, Xiaofei Han, Zongfen Chen, Kai Services Computing Technology and System Lab Cluster and Grid Computing Lab School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China

Virtual machine technology can enhance server utilization and consolidation on an individual physical machine. In a growing number of contexts, many of which re-quire high-performance networking inside of the system. Unfortunately, the development of virtualization technology is inclined to application isolation as yet, leads high communication overheads between virtual machines which are resident on the same physical machine, and also limits the achievable network performance. Some efforts have been paid to bridge the network I/O performance gap between the virtualization and native environment, but the amelioration is not satisfactory. In this paper, we propose a system called IDTS (Inter-Domain Transferring system) which uses the shared memory between different domains (also called hosted or guest OSes) to expand the communication band-width and shorten the latency for network applications running in the co-resident VMs. Evaluations are also presented to prove IDTS's availability and highly efficiency. We believe that IDTS is an effective solution for the inter-domain communication on Xen virtualization platform. © 2010 Academy Publisher.

关键词： Virtualization

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Term translation pair alignment based on a parallel corpus of Chinese historical classics and their english translations

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Journal of Information and Computational science 2010年第9期7卷 1967-1986页

作者： Li, Xiuying Che, Chao Lin, Hongfei Wang, Rongpei School of Foreign Languages Dalian University of Technology Dalian 116024 China Key Laboratory of Advanced Design and Intelligent Computing Ministry of Education Dalian University Dalian 116622 China Department of Computer Science and Technology Dalian University of Technology Dalian 116024 China

We introduce an improved MI-based phrase alignment approach to match Chinese historical terms with their English translations. The proposed approach is motivated by the findings about the inadequacy of popular machine translation systems like Babelfish and Systran in translating Chinese historical terms, and observations about the discrepancies by established translators and Sinologists in handling these historical terms. Modifications to the basic MI alignment approach, including Bridging, Pruning and Head-word Extension, integrate linguistic knowledge of the translation patterns of Chinese historical terms into statistical alignment algorithm. The proposed framework for alignment achieves more than 17 and 10 points increase in percentage respectively above the base line in two individual corpora and detects a number of valid alternative translations for some top-frequency Chinese historical terms. The discovery also alerts us to the potential impact that different corpus may have for an SMT system from the perspective of readability and efficiency. © 2010 Binary Information Press.

关键词： Alignment

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Cache blocks: An efficient scheme for solid state drives without DRAM cache

Cache blocks: An efficient scheme for solid state drives wit...

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IEEE International Conference on Networking, Architecture and Storage

作者： Wu, Fei Chen, Xiang Wan, Jiguang Key Laboratory of Data Storage System School of Computer Science and Technology Huazhong University of Science and Technology Wuhan Hubei 430074 China Division of Data Storage System Wuhan National Laboratory for Optoelectronics China

ISBN: (纸本)9780769541341

Most solid state drives use DRAM for device's cache, the volatile memory provides the I/O Caching ability, and maintains the drives' mapping table (indicates the correspondence between physical unit and logical unit). However, when the drives' power shut down unexpected, the volatile DRAM memory may lose the caching data, which did not have time to write to the drives' storage media, so the dirty data generated. This paper proposes an efficient management scheme for low cost Solid State Drives, with low cost ASIC controller chip, only has internal SRAM memory, and no external DRAM. We use a kind of Cache Blocks: when write requests come, write in these areas first, and write in the sequentially physical place, and the limited internal SRAM for the mapping tables maintaining and data transferring. We propose some efficient methods: 1)using flash memory as cache, 2) page mapping for cache blocks regions, block mapping for data blocks regions, 3) binding two planes operation, 4) using the idle internal plane SRAM as data buffer to improve the I/O performance, without DRAM. So we avoid the dirty data when the power loses unexpected. And this scheme is energy-efficient and low cost. We test the scheme on our own SSD test board, with the pool SRAM size, the I/O performances do not decrease two much, and the random write even better about 20%, compare to the SSD with DRAM. The experiment also shows, this scheme cuts about 21% energy than the DRAM architecture. And it may be adapted in consumer electronics area. © 2010 IEEE.

关键词： Dynamic random access storage

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Effcient Distributed Skyline Queries for Mobile Applications

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Journal of computer science & technology 2010年第3期25卷 523-536页

作者：肖迎元陈跃国 Tianjin Key Laboratory of Intelligence Computing and Novel Software Technology Tianjin University of Technology Key Laboratory of Computer Vision and System Tianjin University of Technology School of Computing National University of Singapore Key Laboratory of Data Engineering and Knowledge Engineering Renmin University of China

In this paper, we consider skyline queries in a mobile and distributed environment, where data objects are distributed in some sites （database servers） which are interconnected through a high-speed wired network, and queries are issued by mobile units （laptop, cell phone, etc.） which access the data objects of database servers by wireless channels. The inherent properties of mobile computing environment such as mobility, limited wireless bandwidth, frequent disconnection, make skyline queries more complicated. We show how to efficiently perform distributed skyline queries in a mobile environment and propose a skyline query processing approach, called efficient distributed skyline based on mobile computing （EDS-MC）. In EDS-MC, a distributed skyline query is decomposed into five processing phases and each phase is elaborately designed in order to reduce the network communication, network delay and query response time. We conduct extensive experiments in a simulated mobile database system, and the experimental results demonstrate the superiority of EDS-MC over other skyline query processing techniques on mobile computing.

关键词： skyline distributed query processing mobile database system

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2010 International Conference on Educational and Information technology, ICEIT 2010

作者： Hao, Senshen Jiao, Jian Xia, Chunhe Li, Xiaojian Yao, Shan State Key Laboratory of Virtual Reality Technology and System School of Computer Science and Engineering Beihang University Beijing China Beijing Key Laboratory of Network Technology School of Computer Science and Engineering Beihang University Beijing China

ISBN: (纸本)9781424480340

In order to effectively deal with large-scale attacks on computer networks, computer Network Defense (CND) policy refinement based on descriptive language is wildly used. However, it's very difficult to figure out the semantic discrepancies between the measures and the predefined policy after the calculation with symbols by computers. A new method is presented to solve the discordance of semantic between the measures and the predefined policy automatically. Based on the establishment of the ontology of CND policy and measure (CNDPM), the CND policy and measure semantic similarity analysis model (CNDPMSSAM) is established, and then the termination of the two main components of CNDPMSSAM are proofed by the putdown automaton, and the prototype system of CNDPMSSAM is implemented. At last, we validate the validity of this method on analyzing semantic similarity of transferring from computer Network Defense Policy Specification Language (CNDPSL) to Defense Measure Description Language (DMDL) with experiments. © 2010 IEEE.

关键词： Ontology

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Descriptive model of peer-to-peer botnet structures

Descriptive model of peer-to-peer botnet structures

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2010 International Conference on Educational and Information technology, ICEIT 2010

作者： Duan, Junfeng Jiao, Jian Xia, Chunhe Yao, Shan Li, Xiaojian State Key Laboratory of Virtual Reality Technology and System School of Computer Science and Engineering Beihang University Beijing China Beijing Key Laboratory of Network Technology School of Computer Science and Engineering Beihang University Beijing China

ISBN: (纸本)9781424480340

Peer-to-peer (P2P) Botnets, which are more resilient and robust than centralized botnets, have emerged as the peer-to-peer technology evolves. Better understanding of this new phenomenon will help researchers develop detection and mitigation methods. Most of existing work is case study of typical P2P botnets. In this paper, we focus on systematically analyzing structures of P2P botnets. We propose a descriptive model of P2P botnet structures, which consists of features of P2P bot, definitions of structures, and structural properties. Firstly, we detail two key functionalities of P2P bot, command-and-control (C&C) functionality and peer-to-peer (P2P) functionality, and give several features of P2P bot. And then, we define two structures of P2P botnets: C&C structure and P2P structure. To characterize these structures, we propose several properties and corresponding quantitative methods. Finally, we conduct experiments to verify our results. © 2010 IEEE.

关键词： Structural properties

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Quantitative and qualitative forecasting applied to supply-chain inventory

Quantitative and qualitative forecasting applied to supply-c...

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2010 2nd International Conference on MultiMedia and Information technology, MMIT 2010

作者： Shao, Chenxi Wang, Lizhong Computer Science and Technology School of University of Science and Technology of China Hefei China Anhui Province Key Laboratory Software in Computing and Communication Hefei 230027 China MOE-Microsoft Key Laboratory Multimedia Computing and Communication University of Science and Technology of China Hefei China

ISBN: (纸本)9780769540085

In the process of supply chain (SC) management, time inventory management problem is extremely important. In terms of academic methods, quantitative methods are very popular as the researchers could calculate the inventory if they got the historic data of some SC. However, based on quantitative methods and the results cannot too be convincible. This paper considered a supply chain system includes several kinds of products. As to the historic suppliers' demand data of this SC system, firstly we applied a quantitative forecasting analysis method to it;secondly we made a qualitative analysis to improve the complex system's inventory management performance. According to the comparison between quantitative method and the method used in this paper, we find that the accuracy is more perfect. Not only the inventory cost is lower, also the forecasting accuracy is better. © 2010 IEEE.

关键词： Supply chain management

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A Hierachical VoIP system Based on Peer-to-Peer SIP: A Manageable Approach

A Hierachical VoIP System Based on Peer-to-Peer SIP: A Manag...

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International Conference on computer and Information technology (CIT)

作者： Linchen Yu Xiaofei Liao Hai Jin Pengcheng Qin Services Computing Technology and System Laboratory Cluster and Grid Computing Laboratory School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China School of Computer China University of Geoscience Wuhan China

Peer-to-Peer SIP is proposed to leverage Peer-to-Peer computing to control multimedia sessions in a decentralized manner. A lot of companies can be benefited if conventional SIP environment does not require the configuration and maintenance of central servers. However, existing P2PSIP systems put too much emphasis on the decentralization of SIP elements and the briefness of distribution. To some extent, P2PSIP system is manageable, but the control of the entire system is still relatively weak. In this paper, we propose a hierarchical P2PSIP system to address the manageable problems. Actual deployment and exhaustive simulations are performed to evaluate the performance of our P2PSIP schemes. Results indicate that the manageable approach not only solves the control liability problem, but also performs good reliability, scalability, and interoperability.

关键词： Servers Tin Reliability Protocols IP networks Authentication Registers

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Efficient and Progressive Algorithms for Distributed Skyline Queries over Uncertain Data

Efficient and Progressive Algorithms for Distributed Skyline...

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IEEE International Conference on Distributed computing systems

作者： Xiaofeng Ding Hai Jin Services Computing Technology and System Lab Cluster and Grid Computing Lab School of Computer Science and Technology Huazhong University of Science and Technology

ISBN: (纸本)9781424472611;9780769540597

The skyline operator has received considerable attention from the database community, due to its importance in many applications including multi-criteria decision making, preference answering, and so forth. In many applications where uncertain data a re inherently exist, i.e., data collected from different sources in distributed locations are usually with imprecise measurements, and thus exhibit kind of uncertainty. Taking into account the network delay and economic cost associated with sharing and communicating large amounts of distributed data over an internet, an important problem in this scenario is to retrieve the global skyline tuples from all the distributed local sites with minimum communication cost. Based on the well known notation of the probabilistic skyline query over centralized uncertain data, in this paper, for the first time, we propose the notation of distributed skyline queries over uncertain data. Furthermore, two communication- and computation-efficient algorithms are proposed to retrieve the qualified skylines from distributed local sites. Extensive experiments have been conducted to verify the efficiency and the effectiveness of our algorithms with both the synthetic and real data sets.

关键词： Plant uncertain Distribute network delay Uncertainty algorithms

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Using GPU to accelerate a pin-based multi-level cache simulator 10

Using GPU to accelerate a pin-based multi-level cache simula...

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Proceedings of the 2010 Spring Simulation Multiconference

作者： Han, Wan Gao, Xiaopeng Long, Xiang Chen, Xianqin State Key Laboratory of Virtual Reality Technology and System School of Computer Science and Engineering Beihang University Beijing China

ISBN: (纸本)9781450300698

Trace-driven simulation methodology is the most widely used method to evaluate the design of future computer memory architecture. Since this methodology demands large amounts of storage and computer time, there is a growing need for simulation methodologies to determine the memory system requirements of emerging workloads in a reasonable amount of time. Several techniques have been proposed to reduce the space that store memory reference and improve the performance of sequential trace-driven simulation. This paper presents the use of binary instrumentation as the memory reference generator and parallel simulation technique that based on the generic graphics processing unit (GPU). One way to achieve fast parallel simulation is to simulate the independent sets of a cache concurrently on different compute resource, but results show that this method is not efficient because of a high correlation of the activity between different sets. To put parallelism to effective use, we show that a multi-configuration simulation in single pass method gains 2.44x performance improvement compared to traditional sequential algorithm. © 2010 SCS.

关键词： Graphics processing unit

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