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Layered streaming is an effective solution to address receiver heterogeneity in a peer-to-peer (P2P) network. This paper addresses the problem of rate allocation for layered video stream in p2p mesh networks. We present a distributed rate allocation algorithm that achieves close to optimal layer allocation among peers receiving the same video. We use load balancing technique that evenly distributes...
In keyword search over relational databases (KSORD), retrieval of user's initial query is often unsatisfying. User has to reformulate his query and execute the new query, which costs much time and effort. In this paper, a method of automatically reformulating user queries by relevance feedback is introduced, which is named VSM-RF. Aimed at the results of KSORD systems, VSM-RF adopts a ranking method...
Reliability testing device of relay is the key to distinguish the reliability grade of relay correctly. To overcome the shortcomings of traditional reliability testing device, such as the number of tested relays at one time is small, and the failure information content is small etc, a distributed reliability testing system of relay based on Ethernet is presented. The structure of system, the hardware...
This paper addresses the problem of optimal rate allocation for video streaming in a multi-path peer-to-peer mesh network. We present a distributed rate allocation algorithm that minimizes the total rate distortion among receiving peers. The scheme assumes that video streams can be transcoded/re-quantized at intermediate peers. We deploy a double pricing solution that simultaneously incorporates both...
In this paper, we describe a heterogeneous peer-to-peer network testbed, which is developed as part of a joint research project to investigate novel resource discovery and content distribution protocols in a heterogeneous wired/wireless environment. We describe the testbed requirements, the testbed architecture, the multi-functional wireless node, and the software architecture. We also describe some...
Traditional approaches to network management are mostly based on the centralized client/server model. Due to the intrinsic limitations of SNMP-based management paradigms, such as information bottlenecks and lack of flexibility, have encouraged a trend towards distributed management system. The emergence of mobile agent frameworks has led many researchers to examine their applicability to network management...
The emerging scalable video coding extension in H.264/AVC standard will enable the deployment of video streaming and distribution applications in heterogeneous environments, with different user bandwidth resources and display capacities. In this paper, we study the problem of how to distribute scalable coded media objects from a media distribution server in peer-to-peer based IPTV applications. All...
In order to improve the utilization ratio of laboratory devices, according to the actual requirements of laboratory management, a Web-based open-laboratory management information system is designed and implemented based on B/S architecture and JSP + Servlet + JavaBeans mode. By this system, student users can browse introducing information, query experiment schedule, reserve open experiments, self-drafted...
Traditional experimental platforms, which are built based on physical machines, have many disadvantages on diversity, security and repeatability. The development of virtual experimental platforms proposed a solution to this problem, but the construction of the network supporting environment remains a challenging task. This paper presents the design and implementation of a virtual network supporting...
Recent advancement in multimedia and network has enabled the development of video accelerator for video sharing website where users can upload, view and share video clips (e.g. YouTube) to achieve better user experience. Several applications have already been developed. The paper examines these technical issues. The benefits of these techniques are discussed. Also the performances of these applications...
For developing a surgical simulation platform that not only accords with software design standards but also conforms with clinical professional requirements; proposed designing and developing surgical simulation platform using COM (Component Object Model) component technology. Surgical simulation platform based on COM designed three core module: model management; surgical planning; surgical evaluating;...
Recent theoretical and simulation-based studies have confirmed the tremendous benefit of peer-to-peer (P2P)communication at reducing the cost of running a VoD service.To date, very limited effort has been paid to validate the concept of peer-assisted VoD service, especially in terms of system implementation and service deployment. In this paper, we present the case study of a peer-assisted video-on-demand...
One conclusion derived from practice is that the power line carrier communication is not suitable for Chinese AMRS (automatic meter reading system). Considering the rapid spread of Internet, the AMRS based on Internet is presented. The structure of system consists of server, data collectors and Internet. For a short distance transmission, data collector collects data from electricity meter using RS485...
This paper presents a new economic and practical TPEG (transport protocol experts group) application for location based service (LBS) that can be provided in terrestrial-digital multimedia broadcasting (DMB) and other digital audio broadcasting (DAB) transmission systems. We propose a novel short audio information (SAI) application interoperable with TPEG protocol, introduce how to integrate it well...
An important issue for supporting multimedia applications in multiple heterogeneous networks, a typical pervasive computing environment, is how to optimize the rate allocation by intelligently utilizing the available network resources while, at the same time, to meet each application's QoS (Quality of Service) requirement. In this work, we develop and evaluate a rate allocation scheme in terms of...
Research shows that location based routing can improve the performance and efficiency of communication in mobile ad hoc networks. From another point of view, disclosure of location information can cause a serious privacy risk, especially in environments where different groups of nodes cannot fully trust each other. In this paper, we propose a protocol through which a wireless node can achieve configurable...
AJAX, a core technology of Web 2.0, is aroused attention by both industry and academia. Google Maps is a classical Web application service based on AJAX. This paper presents a WebGIS framework of web application with AJAX and XML data. Based on Google Maps service, the framework uses XMLHttpRequest objects which call the XML data and load the geographic information dynamically. The framework is consisted...
Parallel debugger is crucial for improving the efficiency of parallel programming development. Parallel debugging interface is the basis of parallel debugging. This paper puts forward a parallel debugger design method of a new interactive, Internet-oriented, extensible parallel debugger framework based on the research of a number of parallel debugging interfaces' design methods and advantages and...
In the existing key pre-distribution scheme suitable for low power and resource sensor nodes, mutual authentication is not allowed and the security tolerance of network is low. In this paper, we propose a new key pre-distribution scheme guaranteeing that any two sensor nodes can find a shared key between themselves. The basic idea of the paper is to combine matrix decomposition technique and polynomial-based...
In order to implement the sharing of remote sensing data over the Internet, we proposed an original approach to acquire and integrate remote sensing image metadata using grid service. Firstly, we encapsulated the metadata extracting algorithms and metadata retrieving algorithms into grid services, which can be called on the Web with SOAP messages; secondly, a grid service registry that enables the...
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