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Conferencing service interworking between overlays and IMS networks

Conferencing service interworking between overlays and IMS n...

引用

International conference on Information networking

作者： Jinsub Sim Tuan Hao Tieu Younghan Kim School of Electronic Engineering Soongsil University Seoul South Korea

ISBN: (纸本)9781612846613

With the advancement of Internet technologies and the widespread use of mobile devices, the number of users in conferencing services is increasing quickly. A P2PSIP conferencing system and an IP multimedia Subsystem (IMS) conferencing system have been designed to provide conferencing services. The IMS conferencing system was developed to adapt to a server-based centralized system, while the P2P network, with its many benefits, has achieved success in providing P2P conferencing services (e.g. the world-wide P2P VoIP network Skype). Each system only provides its own users conferencing services. Therefore, in this paper, we propose an architecture for interworking a conferencing service using P2P overlays and IMS networks. We also illustrate the procedures and detail the functions of each component in the architecture. Finally, we analyze the performance of the first conferencing scenario - IMS UA Invite P2P Peer to IMS conferencing service by using a REFER message.

关键词： Peer to peer computing Logic gates Media Delay Protocols Servers Wireless communication

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Challenges in mobile bio-sensor based mHealth development

Challenges in mobile bio-sensor based mHealth development

引用

International conference on e-health networking, Applications and Services (HealthCom)

作者： Mzomuhle T. Nkosi Fisseha Mekuria Samson H Gejibo Council for Scientific & Industrial Research CSIR-MDS Mobile Computing & Security Unit Pretoria South Africa Dept. of Informatics Centre for International Health University of Bergen Bergen Norway

Healthcare providers are facing growing challenges in patient diagnostics and information gathering due to in-adequate infrastructure and insufficient number of health-care professionals to perform such operations. The traditional way of patient information gathering is largely based on text and dependent on self-report surveys and infrequent doctor consultations. The proposed bio-sensor based frame work can improve remote diagnostics and healthcare information gathering using mobile device based bio-sensor systems. Bio-sensor based systems can be used to gather relevant multimedia health information and improve the quality of remote diagnostic both for ambulatory and continuous monitoring of chronic diseases. The paper addresses bio-sensor signal processing and secure communication of sensor signals based on next generation mobile technology and bio sensors, with the aim to facilitate the development of secure and innovative mobile health services.

关键词： Mobile communication Mobile handsets Digital filters Authentication Medical services Monitoring

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A Dynamic Cluster Construction Method Based on Characteristics of Query Generation in Peer-to-Peer Networks

A Dynamic Cluster Construction Method Based on Characteristi...

引用

International conference on Advanced Information networking and Applications Workshops (AINAW)

作者： Yukie Kobayashi Tomoki Yoshihisa Takahiro Hara Shojiro Nishio Department of Multimedia Engineering Graduate School of Information Science and Technology Osaka University Japan

Due to the recent development of computer and network technologies, there has been increasing interest in peer-to-peer (P2P) networks. To reduce query messages for information retrieval in P2P networks, many conventional studies proposed methods that categorize similar data items and cluster peers that have data items in the same category. Some of them aim to construct clusters dynamically when the number of queries for similar data items exceeds the predetermined threshold. However, these methods have a critical problem that the threshold is fixed for any queries. The fixed threshold cannot perform cluster construction at appropriate timings since they depend on characteristics of query generation. In this paper, we propose a dynamic cluster construction method based on characteristics of query generation. Our method can reduce query messages by constructing dynamic clusters at more appropriate timings. The results of simulation experiments show that our method can reduce query messages compared with an existing method.

关键词： Lead Timing Peer to peer computing Semantics Tsunami Information retrieval Data models

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A Three-Step Service Experience Approach with Feedback for Service Provider

A Three-Step Service Experience Approach with Feedback for S...

引用

IEEE Asia-Pacific conference on Services computing (APSCC)

作者： Zhi Yang Budan Wu Nan Yu Gang Yu Junliang Chen State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing China

Web Service is one of implementation modes of distributed systems and is becoming the next generation web-based application. As the amount of Web services is increasing, service experience problem is emerging. After Web services are implemented and published, service providers do not know their running effect and user satisfactory degree. So in order to provide better services and improve user experience quality, this paper proposes a three-step service experience approach with feedback to service accessing, in which service experience coefficient is used to measure the running effect of service and user satisfaction degree. At the same time, the test data of the feedback are sent to service providers to create new services or improve services in order to provide better services. With the data of the web site WS-DREAM, the service experience approach to service accessing is designed and implemented. The result indicates that the approach is useful to improve better services.

关键词： Web services Indexes Reliability Time factors Quality of service multimedia communication XML

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Quality evaluation for real-time 3D video services

Quality evaluation for real-time 3D video services

引用

IEEE International conference on multimedia and Expo (ICME)

作者： Chaminda T.E.R. Hewage Maria G. Martini Wireless Multimedia & Networking Research Group Faculty of Computing Information Systems and Mathematics Kingston University London UK

3D video adds the sensation of depth to conventional video in order to provide better natural viewing conditions for users. However, 3D video communication applications are in its early stage due to limitations of channel bandwidth and to the packet losses and errors due to congestion and bad channel conditions. In order to provide a better service to 3D video users, the compression and transmission system parameters can be changed "on the fly". The measured 3D video quality at the receiver-side can be used as feedback information to fine tune the system. This paper proposes a quality evaluation method for real-time trans mission of 3D video depth maps associated with colour plus depth based 3D video. The extracted edge information together with luminance and contrast information are employed to evaluate the quality degradation in this method. This work is motivated by the fact that edges and contours of the depth map can represent different depth levels and hence can be used in measuring the structural degradation of 3D depth maps. The performance of the method is evaluated across a range of compression levels and PLRs (Packet Loss Rates) and shows accurate results compared to its counterpart Full-Reference (FR) quality metric.

关键词： Three dimensional displays Image edge detection Measurement Correlation Streaming media Degradation Data mining

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Job sequence scheduling for cloud computing

Job sequence scheduling for cloud computing

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International conference on Cloud and Service computing (CSC)

作者： Yung-Ching Hsu Pangfeng Liu Jan-Jan Wu Department of Computer Science and Information Engineering National Taiwan University Taipei Taiwan Department of Computer Science and Information Engineering Graduate Institute of Networking and Multimedia National Taiwan University Taipei Taiwan Institute of Information Science Academia Sinica Taipei Taiwan

This paper describes the important issue of energy conservation for data centers. We consider the problem of provisioning physical servers to a sequence of jobs, and reducing the total energy consumption. The performance metric is the wasted energy - the over-provisioned computing power provided by the physical servers, but exceeding the requirement of the jobs. We propose three new strategies for allocating servers to a sequence of jobs - a largest machine first heuristic, a best fit method, and a mixed method. We prove that both the largest machine first heuristic and the mixed method will only incur at most 2 in over-provisioned energy. That is, the ratio between the over-provisioned energy and the total provisioned energy is bounded by 2/n(1 + δ), where n is the number of jobs, and 1 + δ is the ratio between the maximum and minimum execution time of jobs. We also derive a tight bound of i on the ratio of wasted energy if the ratio 5 could be arbitrarily large. We also conduct experiments to compare the three algorithms in practice. The experiment results indicate that all three algorithms waste very little energy in over-provision. The mixed method outperforms the best fit method, which outperforms the largest machine first method.

关键词： Program processors Servers Virtual machining Processor scheduling Cloud computing Resource management Energy conservation

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A Real-Data-Stimulated Simulation Assessment Method for P2P-Assisted Telecom IPTV Systems

A Real-Data-Stimulated Simulation Assessment Method for P2P-...

引用

International conference on Network computing and Information Security (NCIS)

作者： Xiuyan Jiang Yinshu Pu Yuan Liu Dejian Ye Guanzhong Lv Qing Xiao Multimedia and Networking Laboratory School of Software Fudan University Shanghai China China Telecom Group Shanghai Company Limited Shanghai China

With China Telecom IPTV system rapidly expanding, reducing operating and deployment costs has become an important issue. To improve IPTV transmission efficiency, using P2P technology is one of the possible solutions. This paper presents a new real-data-stimulated simulation assessment method for P2P-assisted telecom IPTV systems. The new method first proposes a set of performance metrics and primitives to evaluate the system, secondly it analyzes the real topology and actual user behaviors of Shanghai Telecom IPTV system, thirdly it builds a large-scale simulation system RVSPS, and stimulates the simulation system with real topology and actual user behaviors, then it analyzes the impact that various primitives have on the performance metrics. The simulation results show that this method can effectively evaluate the performance of the P2P-assisted telecom IPTV system.

关键词： IPTV Telecommunications Streaming media Topology Measurement Analytical models Servers

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Energy-efficient Virtual Machine Provision Algorithms for Cloud Systems

Energy-efficient Virtual Machine Provision Algorithms for Cl...

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IEEE International conference on Utility and Cloud computing (UCC)

作者： Ching-Chi Lin Pangfeng Liu Jan-Jan Wu Institute of Information Science Academia Sinica Taipei Taiwan Department of Computer Science and Information Engineering Graduate Institute of Networking and Multimedia National Taiwan University Taipei Taiwan

Power consumption is one of the most critical problems in data centers. One effective way to reduce power consumption is to consolidate the hosting workloads and shut down physical machines which become idle after consolidation. Server consolidation is a NP-hard problem. In this paper, we propose two new algorithms, Dynamic Round-Robin (DRR) and Hybrid, which combines DRR and First-Fit, for energy aware virtual machine scheduling and consolidation. We also propose an accurate power model to estimate the power consumption resulted from each algorithm. Strategies we proposed are compared with GREEDY, ROUNDROBIN and POWERSAVE scheduling strategies implemented in the Eucalyptus Cloud system. Our experiment results show that our DRR and Hybrid algorithms reduce power consumption by 56.4% and 55.9% respectively, compared with the ROUNDROBIN scheduling strategy in Eucalyptus. DDR and Hybrid also result in 3% less power consumption on average, compared with the POWERSAVE scheduling strategy in Eucalyptus.

关键词： Virtual machining Power demand Energy consumption Servers Mathematical model Retirement Load modeling

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Peer to peer content sharing on ad hoc networks of smartphones

Peer to peer content sharing on ad hoc networks of smartphon...

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International Wireless Communications and Mobile computing conference, IWCMC

作者： Piotr K. Tysowski Pengxiang Zhao Kshirasagar Naik Department of Electrical & Computer Engineering University of Waterloo Waterloo ONT Canada

Peer-to-peer networks offer advantages over traditional client-server networking models, such as the lack of a need for connectivity to trusted intermediary hosts or servers and the use of less costly communication links. While they have become popular in the wired broadband environment, they have not yet been effectively adapted to the resource-constrained mobile network environment. They promise significant potential in applications such as the sharing of files like multimedia and operating system updates between mobile devices. However, the peer-to-peer model faces unique challenges in the mobile context, such as limitations on processing power, on-board device memory, wireless data bandwidth, and available battery energy. We propose a high-level framework for a peer-to-peer protocol with these specific constraints addressed. In addition, we investigate the feasibility of a practical implementation of a peer-to-peer file sharing model on smartphones, including an analysis of how performance is impacted by various variables that can be dynamically controlled in the protocol. Through experimentation on leading smartphones, we have found various optimal strategies, including minimizing the upload-to-download ratio to conserve battery life, using larger file segments to increase throughput, and using sockets to decrease memory overhead.

关键词： Peer to peer computing Mobile communication Smart phones Bluetooth Protocols Ad hoc networks

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Optimal Algorithms for Cross-Rack Communication Optimization in MapReduce Framework

Optimal Algorithms for Cross-Rack Communication Optimization...

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IEEE International conference on Cloud computing, CLOUD

作者： Li-Yung Ho Jan-Jan Wu Pangfeng Liu Institute of Information Science Academia Sinica Taipei Taiwan Department of Computer Science and Information Engineering National Taiwan University Taipei Taiwan Graduate Institute of Networking and Multimedia National Taiwan University Taipei Taiwan

MapReduce is a widely used data-parallel programming model for large-scale data analysis. The framework is shown to be scalable to thousand of computing nodes and reliable on commodity clusters. However, research has shown that there is room for performance improvement of the MapReduce framework. One of the main performance bottlenecks is caused by the all-to-all communication between mappers and reducers, which may saturate the top-of-rack switch and inflate job execution time. Reducing cross-rack communication will improve job performance. In current MapReduce implementation, the task assignment is based on the pull-model, in which cross-rack traffic is difficult to control. In contrast, the MapReduce framework allows more flexibility in assigning reducers to the computing nodes. In this paper, we investigate the reducer placement problem (RPP), which considers the placement of reducers to minimize cross-rack traffic. We devise two optimal algorithms to solve RPP and implement the algorithms in the Hadoop system. We also propose an analytical solution for this problem. Our experiment results with a set of MapReduce applications show that our optimization achieves 9% to 32%performance improvement compared with the unoptimized Hadoop.

关键词： Silicon Optimization Greedy algorithms Switches Data models Manganese Equations

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