检索结果-内蒙古大学图书馆

International Symposium on Intelligent Information technology Application, IITA

作者： Xinhong Wu 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

This paper describes a method using grid technology to improve traffic algorithm efficiency. The method cooperates traffic status estimation algorithm with grid technology. It collects and preprocesses massive real-time data of taxi global positioning system (GPS) as floating car data as well as geographic Information systems (GIS) data of Shanghai urban road network. Then, it adopts grid technology to deal with computation for the shortest time path algorithm on traffic status estimation in real time. The results of experiment prove that the grid technology can greatly improve the computing efficiency of traffic status estimation model.

关键词： Telecommunication traffic Traffic control Grid computing Roads Global Positioning system Distributed computing Clustering algorithms Computer networks Application software Geographic Information systems

来源：评论

学校读者我要写书评

暂无评论

TCPBridge: A software approach to establish direct communications for NAT hosts

TCPBridge: A software approach to establish direct communica...

引用

ACS/IEEE International Conference on Computer systems and Applications

作者： Sanmin Liu Hai Jin Xiaofei Liao Hong Yao Deze Zeng 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

Traversing network address translation (NAT) for peer-to-peer (P2P) communication has become a hot topic recently. Compared to UDP, establishing TCP connections for hosts behind different NATs is more complex. Thus, many TCP-based applications do not address TCP traversal through NATs. Some solutions suggest using delegates to relay all communications, or tunneling TCP over UDP. However, they require a big reform to network architecture, or using a nonstandard TCP/IP stack. In this paper, we present a novel idea called TCPBridge. TCPBridge converts TCP traversal to UDP traversal without modifying any binaries of the TCP-based applications. Our design can be integrated with those P2P applications which have not solved TCP traversal problem, and extends them to support direct communications between NAT hosts. It deals with the problem of TCP traversal, so as to improve the usability of applications. We have implemented TCPBridge in several existing P2P systems. Statistics prove that TCPBridge is scalable and robust, and we believe it will benefit many other existing P2P applications.

关键词： Network address translation TCPIP Application software Punching Robustness Protocols Communication system software Grid computing Computer science Peer to peer computing

来源：评论

学校读者我要写书评

暂无评论

A New Proxy Scheme for Large-Scale P2P VoD system

A New Proxy Scheme for Large-Scale P2P VoD System

引用

IEEE/IFIP International Conference on Embedded and Ubiquitous computing, EUC

作者： Wenbin Jiang Chong Huang Hai Jin Xiaofei Liao Services Computing Technology and System Laboratory School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China

Large-scale stream media delivery over Internet is one hot and hard problem. Three main solutions have been developed for this purpose. Content delivery network (CDN) can provide high quality streaming service with high cost. Server-based proxies are cost-effective but not scalable due to the limited proxy capacity and its centralized control. Peer-to-peer (P2P) network is scalable but does not guarantee high quality streaming service due to its self-restrained characteristic. This paper proposes a new chunk-based scalable and reliable proxy scheme for P2P network. Clients are self-organized in unstructured P2P VoD system GridCast and requests for media contents that are not found in P2P overlay from proxy servers. This scheme can address the limitations of server-based proxy model and client-based P2P model. The proposed scheme is evaluated by trace-driven simulations from logs collected in GridCast. The results show that the approach proposed significantly improves the quality of media streaming and the system scalability.

关键词： Large-scale systems Streaming media Network servers Bandwidth Scalability Peer to peer computing Web and internet services Costs Centralized control Cache storage

来源：评论

学校读者我要写书评

暂无评论

Desktop Virtualization: Techniques and Applications

Desktop Virtualization: Techniques and Applications

引用

International Conference on Pervasive computing and Applications (ICPCA)

作者： Hai Jin Services Computing Technology and System Laboratory School of Computer Science and Technology Huazhong University of Science슠and슠Technology Wuhan China

In this talk, the author discusses some recent advances in desktop virtualization field. Especially, the author talks about desktop virtualization research work in the National 973 Basic Research Program, The Research on Fundamental Theory and Approach of computing system Virtualization. These works include multi-platform supported virtual desktop (MSVD) and HVM supported virtual laptop environment. The design objectives and considerations are discussed in this talk, as well as the system design, performance evaluation compared with other techniques, and some system demonstrations.

关键词： Application virtualization Pervasive computing Grid computing Computers system software Application software Platform virtualization Resource virtualization Costs Investments

来源：评论

学校读者我要写书评

暂无评论

The Content Pollution in Peer-to-Peer Live Streaming systems: Analysis and Implications

The Content Pollution in Peer-to-Peer Live Streaming Systems...

引用

International Conference on Parallel Processing (ICPP)

作者： Sirui Yang Hai Jin Bo Li Xiaofei Liao Hong Yao Xuping Tu 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

ISBN: (纸本)9781424432134

There has been significant progress in the development and deployment of peer-to-peer (P2P) live video streaming systems. However, there has been little study on the security aspect in such systems. Our prior experiences in Anysee exhibit that existing systems are largely vulnerable to intermediate attacks, in which the content pollution is a common attack that can significantly reduce the content availability, and consequently impair the playback quality. This paper carries out a formal analysis of content pollution and discusses its implications in P2P live video streaming systems. Specifically, we establish a probabilistic model to capture the progress of content pollution. We verify the model using a real implementation based on Anysee system; we evaluate the content pollution effect through extensive simulations. We demonstrate that (1) the number of polluted peers can grow exponentially, similar to random scanning worms. This is vital that with 1% polluters, the overall system can be compromised within minutes; (2) the effective bandwidth utilization can be sharply decreased due to the transmission of polluted packets; (3) Augmenting the number of polluters does not imply a faster progress of content pollution, in which the most influential factors are the peer degree and access bandwidth. We further examine several techniques and demonstrate that a hash-based signature scheme can be effective against the content pollution, in particular when being used during the initial phase.

关键词： Pollution Peer to peer computing Bandwidth Streaming media Availability Grippers Topology

来源：评论

学校读者我要写书评

暂无评论

Ripple: Toward a Substrate Middleware for Peer-to-Peer Applications

Ripple: Toward a Substrate Middleware for Peer-to-Peer Appli...

引用

International Conference on Innovative computing, Information and Control (ICICIC)

作者： Hong Yao Linchen Yu Hai Jin Sirui Yang Qi Huang Wenjian Jiang Cluster and Grid Computing Laboratory Services Computing Technology and System Laboratory Huazhong University of Science and Technology Wuhan China School of Computer Science and Technology China University of Geoscience Wuhan China France Telecom Research and Development Center Beijing China

Peers in multiple P2P applications execute overlapped operations with different implementation, like neighbour management, resource publish/lookup, delay investigation, which leads to poor interoperability and unnecessary network load. Peers contribute their resources only when they stay in same application. We propose a P2P middleware, called Ripple, to accomplish common functions in a layered architecture. Ripple manages all peers running various applications in a uniform substrate overlay network. The substrate overlay is designed with a hybrid topology. This hybrid topology does not aim at only a particular type of applications, but also enables the flexibility for various applications. Our work is an attempt to address common needs of P2P applications, which may simplify the development and improve the performance of P2P networks, as well as mitigate the sampling stress to physical networks.

关键词： Peer to peer computing Delay Tin Topology Indexes Substrates Network topology

来源：评论

学校读者我要写书评

暂无评论

Information Value Evaluation Model for ILM

Information Value Evaluation Model for ILM

引用

ACIS International Conference on Software Engineering, Artificial Intelligence, Networking, and Parallel/Distributed computing (SNPD)

作者： Hai Jin Muzhou Xiong Song Wu Services Computing Technology and System Lab Huazhong University of Science and Technology Wuhan China Cluster and Grid Computing Laboratory Huazhong University of Science and Technology Wuhan China School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9780769532639

The first step towards the information lifecycle management is to differentiate information by values. This paper presents an evaluation model for information value. The idea of the model is from commodity value discipline in economic area. The output of information value evaluation model is determined by information itself which is like commodity price is determined by use-value in economic area. The output of the model is changed around the real information value and controlled by the relationship between information supply and demand. The output of the model is determined by factors from three aspects that are information itself, information supply, and information demand. When applying the model into traditional information management approaches, such as replication, data migration, and backup, those mechanisms control the output of the model through adjusting the ability of information supply.

关键词： Biological system modeling Supply and demand Computational modeling Bandwidth Data models Economics Analytical models

来源：评论

学校读者我要写书评

暂无评论

Grid Maintenance: Challenges and Existing Models

Grid Maintenance: Challenges and Existing Models

引用

3rd International Conference on Information and Communication Technologies, vol.4

作者： Shadi Ibrahim Hai Jin Li Qi Chunqiang Zeng Cluster and Grid Computing Laboratory Services Computing Technology and System Laboratory Huazhong University of Science and Technology Wuhan China

As the world of grid computing is continuously growing, scalability and complexity of grid systems are in an increasing rate. Moreover, grid systems are dynamic and subject to various changes. Management of such changes is a challenging issue facing grid communities. Namely, how to efficiently maintain grid system to adopt the environment modification, to meet the user demands and to manage the dynamic changes has become a big challenge. Manual- or script based maintenance approaches are tedious, time consuming and complex, in addition to being highly prone to errors. Therefore, state-of-the-art maintenance models are designed to support transparent runtime maintenance, fast and comprehensive respond to environmental changes and requirements, consequently, improve the availability and efficiency of the grid system. This paper focuses on investigating maintenance models and their common characteristics for grid. To this end, this paper surveys several representative grid maintenance model systems developed by various projects worldwide. The contributions of this paper are (i) discussing the motivations of maintenance for grid system, (ii) discussing the issues and the challenges in building maintenance mechanisms for grid system, (iii) reviewing maintenance models and compare their efficiencies for grid system, and (iv) discussing possible new directions.

关键词： Grid computing Maintenance Dependecy Efficiency Inconsistency

来源：评论

学校读者我要写书评

暂无评论

Survey on overcoming free riding in peer-to-peer networks

引用

Jisuanji Xuebao/Chinese Journal of Computers 2008年第1期31卷 1-15页

作者： Yu, Yi-Jiao Jin, Hai Key Laboratory of Services Computing Technology and System Huazhong University of Science and Technology Wuhan 430074 China Key Laboratory of Cluster and Grid Computing of Hubei Province Huazhong University of Science and Technology Wuhan 430074 China

Since the first report of free riding on Gnutella in 2000, large amounts of network measurement results show that free riding is prevalent in almost all Peer-to-Peer (P2P) networks, which reduces the robustness, availability and lifetime of P2P networks. Overcoming free riding becomes a hot research issue both in academic and industrial communities. The traffic measurement mechanisms in P2P networks are overviewed, which include active measurement and passive measurement. Some detailed traffic measurement results of Gnutella overlay network are illustrated, which indicate the development of free riding in P2P network in recent 6 years. The modeling of P2P network is introduced, and the impacts to system performance of free riding are discussed. Moreover, the authors focus on the mechanisms avoiding free riding and categorize the proposed approaches into incentive mechanisms, game theoretical approaches, and social network or economic models based methods. Each category is discussed in detail, and some typical work is introduced. Especially, the features of these three categories of solutions are analyzed and compared from the aspect of engineering implementation, which is helpful to both the P2P software developers and academic researchers. Finally, future works about the mechanisms discouraging free riding in P2P networks are outlined.

关键词： Computer networks

来源：评论

学校读者我要写书评

暂无评论

An approach for indexing, storing and retrieving domain knowledge

Proceedings of the ACM Symposium on Applied Computing

引用

Proceedings of the ACM Symposium on Applied computing 2007年 1381-1382页

作者： Wu, Hao Jin, Hai Ning, Xiaomin Cluster and Grid Computing Laboratory Services Computing Technology and System Lab. Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)1595934804;9781595934802

In this short paper, we present our solution to index, store and retrieve the domain knowledge. The main principle exploits Lucene to index the domain knowledge under guide of the domain schema. The method to map domain knowledge structure into Lucene index structure, store and update the indices, and to transfer RDF-based query into Lucene's query are presented. Copyright 2007 ACM.

关键词： Knowledge acquisition

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：