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2010 International Conference on Web Information Systems and Mining, WISM 2010

作者： Fu, Wei Zhang, Yingzhou Sun, Wuji Yang, Geng Nanjing Univ. of Posts and Telecomm. Nanjing 210003 China State Key Lab. of Novel Software Technology Nanjing Univ. Nanjing 210093 China State Key Lab. of Networking and Switching Technology Beijing Univ. of Posts and Telecomm. Beijing 100876 China

ISBN: (纸本)9780769542249

With the development of web service, the number of applications based on web service is increasing rapidly in recent years. More and more attention has been drawn to web service because of its convenience and platform-independence. In the few past years, UDDI is a common mechanism of publishing services in industrial applications. However, there are still no official standards which are recommended by W3C about how to publish and discover services. This paper proposes a method based on program slicing to publish and discover web services. The technology introduced in this paper is to add dependences between services into the UDDI registry center when services are published. A service dependence graph will be generated according to the dependences between services recorded in the UDDI registry center. Through implementing slicing operation on such a service dependence graph, a service and the services which it depends on will be discovered at the same time. The results of experiments show that our methods of web service publishing and discovery are feasible. © 2010 IEEE.

关键词： Web services

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A FUZZY GREY FORECASTING MODEL FOR MULTI-SCALE INTERNET TRAFFIC

A FUZZY GREY FORECASTING MODEL FOR MULTI-SCALE INTERNET TRAF...

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2010 3rd IEEE International Conference on Broadband Network & Multimedia technology(2010年第三届IEEE宽带网络与多媒体国际会议 IC-BNMT 2010)

作者： Yidong Cui Qiyao Wang Yuehui Jin State Key Lab of Networking and Switching Technology Beijing University of Posts and Telecommunicati School of Information and Communication EngineeringBeijing University of Posts and Telecommunication State Key Lab of Networking and Switching Technology Beijing University of Posts and Telecommunicat

The Undulating Grey Model (UGM) can be used to predict internet traffic, and it performs better than other Grey Models upon multi-scale traffics. However, UGM employs frequency spectrum of the traffic and needs to select the most significant frequencies as the parameters, which is hard to be decided manually. In this paper, we introduce clustering methods to find the significant frequencies. We find the best modeling length based on different clustering groups. We also find the value of the best modeling length is relevant to the frequency spectrum.

关键词： Grey Model Fuzzy Multi-Scale Prediction

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Program slicing based web-service generation and composition

Program slicing based web-service generation and composition

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5th IEEE International Symposium on Service-Oriented System Engineering, SOSE 2010

作者： Fu, Wei Zhang, Yingzhou Han, Wei Fan, Xiaowei Yang, Geng College of Computer Nanjing Univ. of Posts and Telecomm. Nanjing 210003 China State Key Lab. of Networking and Switching Technology Beijing Univ. of Posts and Telecomm. Beijing 100876 China State Key Lab. of Novel Software Technology Nanjing Univ. Nanjing 210093 China

ISBN: (纸本)9780769540818

As the development of web services, much attention has been drawn to web service because of its convenience and platform-independence. However, how to discover, generate and compose services has become an open issue recently. This paper proposes a method based on program slicing to realize the generation and composition of web services. It gives the method about how to generate a WSDL file and a SOAP message from source codes as well as a theory of function dependence graph. The results of experiments show that our methods of web service generation and composition are feasible and effective. © 2010 IEEE.

关键词： Web services

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Web services feature interaction detection based on situation calculus

Web services feature interaction detection based on situatio...

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World Congress on Services

作者： Xu, Jiuyun Yu, Wengong Chen, Kun Reiff-Marganiec, Stephan School of Computer and Communication Engineering China University of Petroleum Dongying China State Key Lab of Networking and Switching Technology Beijing University of Posts and Telecom Beijing China Dept. of Computer Science University of Leicester Leicester China

ISBN: (纸本)9780769541297

Feature interaction has been identified as a problem in the telecommunications domain in the 1980s, but since it has been shown to be a problem of systems that are composed of individually designed components. Clearly Web service composition is a way of building services from independently designed components and hence is subject to the same problem. This paper investigates the detection of feature interactions in Web services at runtime and proposes a novel detection method by taking inspiration from the Situation Calculus. Two case studies show that it is effective for detecting feature interactions in composite Web services. © 2010 IEEE.

关键词： Web services

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Joint Admission Control through Vertical Handoffs in Heterogeneous Wireless Networks

Joint Admission Control through Vertical Handoffs in Heterog...

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International Conference on Wireless Communications, networking and Mobile Computing (WiCom)

作者： Qiang Deng Bo Hu Yan Shi Shan-zhi Chen State Key Lab of Switching and Networking Technology Beijing University of Posts and Telecommunications Beijing China China Academy of Telecommunication Technology State Key Lab of Wireless Mobile Communication Beijing China

This paper considers optimizing the utilization of radio resources in a heterogeneous networks consisting of a WLAN and a CDMA network. We propose a joint admission control scheme for multimedia traffic that exploits vertical handoffs as an effective tool to enhance radio resource management while guaranteeing handoff users' QoS requirements. The network resources utilized by the vertical handoff user are captured by a link utility function. A signaling cost is used to model the signaling and processing load incurred on the network when vertical handoff is performed. The performance of the joint admission control scheme is analyzed based on the formulation of the admission control actions. Voice and data applications are considered in the performance evaluation, and the simulation results show that the proposed scheme can efficiently relieve the congestion, balance the load and improve the overall network reward.

关键词： Multiaccess communication Wireless LAN Admission control Joints Delay Bit error rate Bandwidth

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EXPANSION OF VIDEO CODEC (H.264) AND VIDEO PROCESSING OPTIMIZATION BASED ON JAVA MEDIA FRAMEWORK

EXPANSION OF VIDEO CODEC (H.264) AND VIDEO PROCESSING OPTIMI...

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2010 3rd IEEE International Conference on Broadband Network & Multimedia technology(2010年第三届IEEE宽带网络与多媒体国际会议 IC-BNMT 2010)

作者： Junliang Chen Chuanchang Liu Xihe Liu Bo Cheng Gang Tan The State Key Lab of Networking and Switching Beijing University of Posts and Telecommunications Be Guiyang Putian Logistics Technology Co.Ltd Guiyang 550008 China

The effect of multimedia conference system is the main factor influencing people's communication. In this article, we will try our best to enhance the quality of video effect and improve the efficiency of multimedia transmission. Through using high compression video codec (H.264), cutting the data at the sending part, catching and sorting the data at the receiving part, we can minimize the data of video, reduce the loss rate through network and improve the decoding rate at the receiving part. By using those methods, the software can acquire better real time and higher quality.

关键词： H.264 decoding rates video data compression

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A FAST LINK FAILURE RECOVERY TECHNIQUE BASED ON MULTI-TOPOLOGY

A FAST LINK FAILURE RECOVERY TECHNIQUE BASED ON MULTI-TOPOLO...

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2010 3rd IEEE International Conference on Broadband Network & Multimedia technology(2010年第三届IEEE宽带网络与多媒体国际会议 IC-BNMT 2010)

作者： Yuanni Liu Xin Li Shanzhi Chen Zhen Qin State Key Laboratory of Switching and Networking Technology Beijing University of Posts and Telecomm State key Lab of Wireless Mobile Communication China Academy of Telecommunication Technology Beijin Xidian University Xi'an Shaanxi 710126China

With the rapid development of Internet, it has become an essential infrastructure for communication today, while the IP layer has a poor ability in fast failure recovery, which impending the improving of the Internet performance. Concerned to the single link failure problems, this paper proposed a fast link failure recovery mechanism based on multi-topology. Firstly, by theoretical analysis, the number of the backup topology was determined with up to 3;Secondly, we also proposed to create the smallest similarity graphs as the backup topologies which is based on link vector similarity so than the router can switch to the backup link computed in advance to protect the failure in real time. Simulation results show that the shortest average path length obtained by our Multi-Topology(MT) algorithm has little difference with the Dijkstra algorithm, but is less than FIR(Failure Insensitive Routing), which exhibits a good performance. In addition, with the increasing of node degree, mathematical expectation and variance of the shortest average path difference between MT and Dijkstra remains a very small range that can be ignored.

关键词： multi-topology link failure recovery Dijkstra

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The Design and Implementation of Multimedia Conference Mobile Terminal Application

The Design and Implementation of Multimedia Conference Mobil...

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International Conference on Wireless Communications, networking and Mobile Computing (WiCom)

作者： Jingjing Ha Yanlei Shang Junliang Chen Gang Tan The State Key Lab of Networking and Switching Beijing University of Posts and Telecommunications Beijing China Guiyang Putian Logistics Technology Co. Ltd Guiyang China

The development of economics and the globalization of trade make cross-region communication increasingly frequent. Traditional communication methods, such as telephone, fax and Email can not satisfy people's daily demands. Multimedia conference system supports people in different places share audio, video and documents to achieve real-time communication. Nowadays, multimedia conference system is mostly accessed via conference television and SIP terminal but lacks mobility support. In this paper, we design and implement a Symbian-based multimedia conference mobile terminal application with which 3G users can enjoy real-time and high-quality conference experience.

关键词： Multimedia communication Streaming media Mobile communication Servers Logic gates Switches

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Automatic testing of Web services in Haskell platform

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Journal of Computational Information Systems 2010年第9期6卷 2859-2867页

作者： Zhang, Yingzhou Fu, Wei Qian, Junyan College of Computer Nanjing Univ. of Posts and Telecomm. Nanjing 210003 China State Key Lab. of Networking and Switching Technology Beijing Univ. of Posts and Telecomm. Beijing 100876 China State Key Lab. of Novel Software Technology Nanjing Univ. Nanjing 210093 China Dept. of Computer Science and Technology Guilin Univ. of Electronic Technology Guilin 541004 China

As a concrete alternative to the development of distributed and connected applications, the Web Service (WS) technique is attracting more and more attention. WS testing is important because it will help the consumers to assess many WS quality attributes such as robustness. We in this paper present a framework with Haskell modules (such as QuickCheck, SmallCheck, HUnit and HSX) for automatically generating and invoking WS based on their WSDL specifications. Based on QuickCheck and HSX, we can quickly generate a number of WS tests and easily execute them with QuickCheck properties. With the help of HUnit, we can easily organize our WS test plan. In particular, a WS test suite can more easily be computed ″on the fly″ than in other test frameworks. Moreover, the nature of Haskell such as powerful abstraction facilities can provide unmatched support for WS regression testing. © 2010 Binary Information Press.

关键词： WSDL

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Link Congestion Control Mechanism Based on Multi-Topology

Link Congestion Control Mechanism Based on Multi-Topology

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International Conference on Wireless Communications, networking and Mobile Computing (WiCom)

作者： Yuanni Liu Xin Li Shanzhi Chen Zhen Qin State key Laboratory of Switching and Networking Technology Beijing University of Posts and Telecommunications Beijing China State key Lab. of Wireless Mobile Commun. China Acad. of Telecommun. Technol. Beijing China Xidian University Xi'an Shaanxi China

There are two causes of network congestion: one is the lack of network resources, and the other is the irrational allocation of network resources. While traditional congestion control methods such as rate control, window mechanism, queue control, etc. can be applied to solve the congestion problem, but for the later congestion case, the fundamental solution is to make more effectively use of the network resources by adjusting the traffic routing choice when congestion occurs. Therefore, in the OSPF (Open Shortest Path First ) network, when congestion occurs in a certain link, lots of unused bandwidth may exist in the links which are not on the SPT. By adjusting the routes, traffic can bypass the current congest link and be forwarded to the destination consecutively, and the network congestion can be lightened eventually. In this paper we proposed a new link congestion control mechanism based on Multi-Topology: when congestion occurs in a certain link, according to the sub topology, the router can switch to the backup link computed in advance, so that traffic can avoid the current congestion to be forward to the destination. The simulation result shows that, our mechanism can make use of the remaining link bandwidth effectively to lighten network congestion.

关键词： Topology Network topology Routing Simulation Switches Throughput

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