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Service Guarantee for Inter-domain Movement in Wireless Peer-to-Peer Live Streaming system

Service Guarantee for Inter-domain Movement in Wireless Peer...

引用

International Symposium on Parallel Architectures, Algorithms and Networks (ISPAN)

作者： Wenbin Jiang Haixiang Li Hai Jin 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

When extending peer-to-peer live streaming system to IEEE 802.11-based wireless network, service guarantee for inter-domain movement is an obstacle since IEEE 802.11 has no QoS maintenance mechanism for it. The stream system must consider it itself. As a peer roams among adjacent networks, the streaming service will be interrupted by the disconnection of wireless network path and IP address changes. Here, a service guarantee mechanism is presented for the QoS of the wireless peer-to-peer living streaming while peer inter-domain roaming. A behavior prediction method based on wireless signal, a pre-caching strategy based on location, and a temp-storing strategy based on ability, are proposed to help the wireless peer rapidly resuming the topology and data transfer. The experiment results show that it can achieve good buffering for wireless roaming peers, which makes uninterrupted stream playing on mobile devices finally, when they roam among different domains.

关键词： Peer to peer computing Wireless LAN Switches Wireless networks Roaming Personal digital assistants Bandwidth Telecommunication network topology clustering algorithms Computers

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Fast Isosurface Extraction for Medical Volume Dataset on Cell BE

Fast Isosurface Extraction for Medical Volume Dataset on Cel...

引用

International Conference on Parallel Processing (ICPP)

作者： Hai Jin Bo Li Ran Zheng Qin Zhang 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

The size of volumetric data generated by medical imaging and scientific simulations is increased significantly due to the dramatic advances in medical imaging modalities and computing technologies. The volumetric data generally need to be visualized and marching cubes algorithm (MC for short) is one of the standard methods of the isosurface extraction for the medical applications. However, MC algorithm requires a large amount of data computing power. The cell broadband engine (Cell for short) processor, which is a typical COTS (commodity off-the-shelf) heterogeneous designed to handle extremely demanding computations, can be used to hasten isosurface extraction in medial application. In this paper, we present a streaming model-based scheme to efficiently map MC algorithm to Cell. Specifically, a block-based filter running on PPE is imposed as a preprocessing stage to avoid unnecessary data transfer and computation, and the MC kernel runs on SPEs as the subsequent stage. Through tuning the size of the block, the workload of PPE and SPE is orchestrated harmoniously. The experimental results demonstrate that overall isosurface extraction speedup of more than 10 times is achieved compared with conventional heavy iron CPUs.

关键词： Isosurfaces Data mining Biomedical imaging Computational modeling Medical simulation Computers Data visualization Medical services Biomedical equipment Engines

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A method of multi-VM automatic network configuration

A method of multi-VM automatic network configuration

引用

IEEE International Conference on Intelligent computing and Intelligent systems (ICIS)

作者： Xin Ge Hai Jin Song Wu Xuanhua Shi Wei Gao 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

In multi-VM (virtual machine) environment, the virtual machine network management plays an important role. Traditional multi-VM management systems are accustomed to using the DHCP mechanism. However, with the development of virtual network technology, DHCP is not suitable for constructing the stable and transparent virtual network environment. In this paper, we propose a method of multi-VM automatic network configuration, which focuses on multi-VM to initialize and configure the virtual network and provides a unified network management for physical and virtual machine system. We introduce concise communication model and protocol into the system to form a unified set of management mechanisms devoting to construct and simplify virtual machine environment. Through the performance comparison with XenServer, the multi-VM automatic network configuration system could improve the communication efficiency by 8-17% in average during the period of network initialization, and it stabilizes the whole network during the period of changing network configuration.

关键词： Virtual machining Environmental management Protocols Virtual manufacturing Resource management User interfaces grid computing Computer science Computer network management technology management

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DVM-MAC: A Mandatory Access Control system in Distributed Virtual computing Environment

DVM-MAC: A Mandatory Access Control System in Distributed Vi...

引用

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

引用

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...

引用

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 ...

引用

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

引用

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...

引用

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...

引用

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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