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International Conference on Parallel and Distributed systems (ICPADS)

作者： Deqing Zou Lei Shi Hai Jin 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

We design and implement a Mandatory Access Control (MAC) system in distributed virtual computing environment, named DVM-MAC, aiming to provide distributed trust through enforcing MAC policies. In DVM-MAC, Prioritized Chinese Wall (PCW) model is implemented to control potential covert channels between VMs in both single node and distributed environment. A policy enforcement module locates inside Xen VMM for better enforcing MAC locally rather than outside the VMM. DVM-MAC adopts centralized architecture for multi-level management and secure transmission of inter-node policy information. For performance consideration, a specific policy decision and enforcement module for controlling inter-node behaviors is moved out of Xen VMM and up to user space. DVM-MAC authorizes a specific center node named Central Security Server (CSS) to be responsible for the decision making between the nodes as well as leaves the inter-node policy enforcement module in each node. Through our experiments and data analysis, we verify the correctness, effectiveness, and efficiency in our prototype when implementing PCW model.

关键词： Access control Distributed computing Voice mail Virtual manufacturing Virtual machining Hardware grid computing Operating systems Concurrent computing Resource virtualization

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A Simulation Times Model of Multi-core Simulation

A Simulation Times Model of Multi-core Simulation

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WRI World Congress on Software Engineering, WCSE

作者： Zhibin Yu Hai Jin Yabin Hu 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

Chip multi-processor (CMP) increases processor throughput by duplicating resources for many threads. Due to the main frequency of a single processor approaching to limit, CMP is becoming more and more popular. However, it is not well studied how to evaluate a new CMP design by simulation. This paper analyzes the possible organizations of cores on a CMP and then presents a mathematical model for the simulation times. It also provides a sampling policy used to reduce the simulation times. The sampling experiments show that the simulation time is 7.5 days under condition that the required confidence level is 95% and confidence interval is 4 when the benchmarks in SPEC CPU2000 are used. As for the simulation of CMPs, the simulation time is very short.

关键词： Yarn Analytical models Process design Hardware Sampling methods Throughput Frequency Computational modeling Computer simulation Multicore processing

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Pulmonary Disease Census Aiding system Based on Medical Image grid

Pulmonary Disease Census Aiding System Based on Medical Imag...

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Asian Conference on Intelligent Information and Database systems, ACIIDS

作者： Hai Jin Aobing Sun Qin Zhang Ran Zheng Ruhan He Services Computing Technology and System Laboratory Cluster and Grid Computing Laboratorie school of Computer Science and Technology Huazhong University of Science and Technology HUST Wuhan China

The large population exerts high burdens to Chinese health census works. In this paper, we propose our PDCAS (pulmonary disease census aiding system) based on medical image grid, which aims to utilize the superiorities of grid technology to improve the efficiency of high-incidence and occupational pulmonary disease census. PDCAS integrates the individual medical information distributed in different hospitalspsila information systems into Medical Information Centre of one area. The census records are classified through one risk rate based cross clustering model to direct the medical diagnosis and review. The main processing algorithms of PDCAS are subdivided and encapsulated as detachable Web services with adapted granularity to support the grid workflow composition corresponding to different pulmonary diseases or aiding aims. The prototype of PDCAS proves the possible improvement of grid technology to diseases census and other data intensive medical applications.

关键词： Diseases Biomedical imaging Medical diagnostic imaging Information systems Medical diagnosis clustering algorithms Web services Prototypes Medical services Biomedical equipment

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LAOVM: Lightweight Application-Oriented Virtual Machine for Thread Migration

LAOVM: Lightweight Application-Oriented Virtual Machine for ...

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International Conference on Computer and Information Science (ACIS)

作者： Xiaofei Liao Yifan Yue Hai Jin Haikun Liu Services Computing Technology and Systems Lab Cluster and Grid Computing Lab School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China

This paper describes the scheme of thread migration in a language virtual machine LAOVM - lightweight application-oriented virtual machine. To maintain high portability and flexibility, thread migration is implemented at language level. To migrate process or thread in runtime in LAOVM, the following issues are addressed: (1) supporting kinds of applications implemented by different programming language; (2) enabling transparent process migration indifferent operating system; (3) implementing fine-grained mobility. Experimental results show that the downtime of thread migration is reasonably small, even the application runtime image is required for occupying massive memory blocks.

关键词： Virtual machining Yarn Operating systems grid computing Paper technology Runtime Computer languages Kernel Information science Computer science

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Worm Containment in Peer-to-Peer Networks

Worm Containment in Peer-to-Peer Networks

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International Conference on Scalable computing and Communications;International Conference on Embedded computing, SCALCOM-EMBEDDEDCOM

作者： Sirui Yang Hai Jin Bo Li Xiaofei Liao Hong Yao 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 Hong Kong University of Science and Technology Hong Kong China

Recently there have been increasing attentions on the security aspects in Peer-to-Peer (P2P) networks, especially with respect to worm epidemics. However, existing worm containment mechanisms can be largely ineffective due to the long delay exhibited in worm identification and patch generation. In this paper, we propose a new worm containment algorithm based on the concept of overlay partition, which can effectively quarantine worms into small and more manageable sub-networks. This algorithm relies on a simple anomaly detection which takes effect much faster than existing schemes. With ldquobridge linksrdquo, the alert of an anomaly can be disseminated faster than random scanning and dedicated worms. Further, in order to deal with false positives, we propose a granularity based clustering algorithm, called CAGA, which, through extensive simulation, is shown to realize better service sustenance during unnecessary partition caused by false positives and can effectively contain fast worms. Finally, we examine the effects of topologies and network dynamics.

关键词： Peer to peer computing Computer worms Partitioning algorithms clustering algorithms Embedded computing grid computing Computer networks Computer science Computer security Delay

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A Novel Application-layer Relay Strategy for Low Delay P2P SIP VoIP system

A Novel Application-layer Relay Strategy for Low Delay P2P S...

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International Conference on Ubiquitous Information Technologies and Applications (ICUT)

作者： Hong Yao Hai Jin Siwei Zhou Linchen Yu Xiaofei Liao 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 Science and Technology China University of Geoscience Wuhan China

Development of Internet brings the great increasing communication requirement. This demand impels the developing progress of Voice over Internet Protocol (VoIP). It is difficult to supply the high quality user experience for VoIP services, which has brought great challenges to VoIP developer because of the dynamic property of Internet. We obtain the following results in lots of existing VoIP systems: (1) many relay peer selections are suboptimal; (2) the waiting time to select a relay node can be quite long; (3) there are a large number of unnecessary probes, resulting in heavy network traffic. This paper presents a way called novel application-layer relay strategy (NARS) to solve relay problem and improve scalability. We introduce the mechanism in detail, and test our mechanism in NS2 network simulation environment and get a high relay node hit ratio result, which confirms the feasibility of NARS. Also we make a comparison with the other existing models.

关键词： Relays Delay Peer to peer computing Internet telephony Web and internet services Probes Telecommunication traffic Traffic control Scalability Testing

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Modeling and Analyzing Dynamic Forensics system Based on Intrusion Tolerance

Modeling and Analyzing Dynamic Forensics System Based on Int...

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International Conference on Computer and Information technology (CIT)

作者： Lin Chen Zhitang Li Cuixia Gao Yingshu Liu School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China 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

As an important part of computer forensics, network forensics particularly places emphasis on dynamic network information collection and proactive defense. Most forensics systems based on intrusion detection or honeypot rarely emphasize the availability of actual servers. In addition, few of them discussed the occasion of dynamic forensics particularly. The work presented in this paper is based on an idea to assist dynamic forensics with intrusion tolerance and deception technology to enhance the availability of server system and gather more useful evidences on a proper occasion. A mechanism of dynamic forensics based on intrusion forensics is proposed and is modeled with finite state machine. The workflow is described. A semi Markov process based on the embedded Markov chain of the states transition model is built and described. Finally, the forensics capability and server availability are analysis. According to the numerical analysis result, the security performance and forensics capability of the forensics system are enhanced to a certain degree.

关键词： Intrusion detection Computer networks Information analysis Computer science Markov processes grid computing Network servers Protection Digital forensics Law

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Event-Driven Scheduling for P2P VoD

Event-Driven Scheduling for P2P VoD

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Chinagrid Annual Conference (Chinagrid)

作者： Bin Cheng Hai Jin Xiaofei Liao Bo Li Services Computing Technology and System Laboratory Cluster and Grid Computing Laboratory School of Computer Science and Technology Huazhong University of Science and Technology China Department of Computer Science Hong Kong University of Science and Technology Hong Kong China

Scheduling is essential in peer-to-peer (P2P) video-on-demand (VoD) applications to obtain desirable user experience and high sharing efficiency. Existing systems and proposals largely utilize scheduling mechanisms that are periodical in nature. We refer these as time-driven scheduling. In this paper we argue that the time-driven scheduling algorithm is not efficient for P2P VoD due to its inadequate resource utilization and inability in quickly adapting to the potential dynamics in such systems. We propose an event-driven scheduling algorithm for P2P VoD systems, in which the scheduler is triggered by events such as peer churn or/and random seeks. We evaluate our design through extensive simulations, and the experimental results show that event-driven scheduling outperforms time-driven scheduling in terms of both user experience and system scalability.

关键词： Scheduling algorithm Dynamic scheduling Processor scheduling Peer to peer computing Large-scale systems Bandwidth Computer science Resource management Discrete event simulation Scalability

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Building dynamic integrity protection for multiple independent authorities in virtualization-based infrastructure

Building dynamic integrity protection for multiple independe...

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International Workshop on grid computing

作者： Ge Cheng Hai Jin Deqing Zou Xinwen Zhang Min Li Chen Yu Guofu Xiang 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 Samsung Information Systems America Inc. San Jose CA USA

In grid and cloud computing infrastructures, the integrity of a computing platform is a critical security requirement in order to provide secure and honest computing environments to service providers and resource consumers. However, due to the fact that software components running on a single platform are usually provided and maintained by different authorities which are potentially untrusted to each other, the problem to monitor and protect runtime system integrity become very challenging and has not been well addressed yet. In this paper, we present a virtualization based dynamic integrity protection method which ensures that only appropriate authorities can control over their components without interfering with other component providers or authorities. In our solution, integrity requirements defined by the authorities of upper components (e.g., service middleware and applications) are respected by preventing the underlying components (e.g., operating system) from exposing their sensitive data, which can be caused by update of the underlying components or other malicious actions. We implement our solution on Xen-based platform, and our evaluation results show that the solution is effective for integrity protection with acceptable performance overhead.

关键词： Protection Cloud computing grid computing Application software Hardware Portable computers Middleware Physics computing Operating systems Computer science

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Exploring Semantic Association Rules Between Keyword and Visual Feature clusters for Web Image Retrieval

引用

电子学报(英文版) 2008年第1期17卷 59-65页

作者： JIN Hai HE Ruhan TAO Wenbing Services Computing Technology and System Laboratory Cluster and Grid Computing Laboratory Huazhong University of Science and Technology Wuhan 430074 China

The semantic gap is a big challenge in image retrieval area. Previous studies in web image retrieval have mainly focused on Relevance feedback (RF) and Latent semantic indexing (LSI) to alleviate the gap. This paper proposes an approach base on Frequent itemset mining (FIM) and Association rule (AR) techniques, which explores the semantic association rule between the two modalities that are represented by keyword and visual feature clusters. The rules are obtained offline based on the inverted file, and utilized in query process online to realize the integration of the two modalities of web images. Our approach improves the retrieval performance and is scalable well, as well as satisfies the requirement of the web users with no additional interactions. The experiments are carried out in our web image retrieval system named VAST (VisuAl & SemanTic image search), and the results show the effectiveness of the proposed approach.

关键词：图像处理自适应算法图像恢复语义联合规则视觉特征

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