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Location-aware is becoming an important aspect of mobile computing. A core problem in location-aware service is the determination of physical location. For applications in open, outdoor areas, the Global Positioning System is a common choice. Although GPS offers near-worldwide coverage, its performance degrades indoors and in high-rise urban areas. By using signal strength, it is possible to locate...
ZigBee is the new standard that has been developed for low cost, low data rate and low power consumption wireless network. And mesh is a type of network architecture. This paper provides a brief overview of the available IEEE 802.15.4 topologies, and then delvesing the mesh topology, describing its advances, disadvantages and application, and presents a detailed study on open research issues in ZigBee...
Allocating bandwidth efficiently is an effective approach to guarantee QoS in ad hoc networks. A bandwidth allocation algorithm is proposed which based on traffic priority for ad hoc networks with clustered structures. The algorithm achieves QoS guarantee for the traffic with higher priority by upgrading or degrading QoS of the traffic. Simulation results are presented to demonstrate the performance...
In many wireless sensor network applications have a demand for high reliability transmission, in view of this need to design and achieve a reliable multi-path routing (RMR) protocol is a suitable application for wireless sensor network. In the trunk path failure through the path of transmission of data backup methods, the routing protocol improves reliability of data transmissions by the agreement...
In order to prolong the network lifetime, energy-aware protocols should be designed to adapt the characteristic of wireless sensor networks. Clustering is a kind of key routing technique used to reduce energy consumption. In this paper, a new clustering algorithm MNLC (Maximum Network Lifetime Clustering Algorithm) for energy heterogeneous sensor networks is proposed. The algorithm uses distributed,...
In this paper, the technology of auxiliary VLAN is discussed. When IP phones are connected to the existing switch-based campus area network, the data traffic and voice traffic are present on the VLAN at the same time. To avoid a significant reduction on the quality of the VoIP traffic, the voice traffic is separated from the data traffic on an auxiliary VLAN. In an IP PBX, there are three frame types...
Due to the system obturation, surveillance service based on dedicated network can not be accessed by different network technologies and has no mobility. The surveillance application based on Internet can not provide security and QoS guarantee. This paper proposes a new architecture which is based on IP Multimedia Subsystem (IMS), and analyzes the advantages of the introduction of IMS. Furthermore,...
The Message Session Relay Protocol (MSRP) is defined by IETF as a session-oriented for instant message, file transfer,remote desktop sharing, whiteboard for telephone conferences and so on. Itpsilas also adopted by IP multimedia subsystem in 3G networks and becoming as important as RTP. So how to make MSRP work well through NATs have been addressed from various aspects. In this paper we propose the...
CONN (Compound Orthogonal Neural Network)-PID hybrid controller whose advantages have been highlighted amid hybrid control systems gradually is characterized by simple topology structure, high control accuracy, good real-time control ability and strong robust-ability. Aiming at its significant meaning in application, this article attempts to gain an insight into this new intelligent control system...
As a special kind of security protocol, ecommerce protocols have been analyzed with many formal methods in recent years. However, there is no general specification and verification model checking method to be applied effectively to the four special properties in ecommerce protocols--non-repudiation, accountability, fairness, and timeliness. Based on our previous work on the suitability of colored...
Providing rich data collaboration services in conferencing system is vital to the success of SIP-based communication system. It not only presents design and implementation challenges, but also gives an opportunity to develop rich and innovative collaboration services conveniently to provide users with novel communication experience. In this paper we present an extended data collaboration mechanism...
The inadaptability of the existing network management protocol for the space network environment is analyzed in the paper. A new Spaces Network Management Protocol SP-SNMP is proposed and in which SER, the polling based on MIB and table operation protocol message used are detailed introduced, and conversion gateway is designed for different protocols. At last the performance of the protocol is tested...
In this paper the problems in the automation testing of GUI based Web applications are discussed. A new automation testing framework based on the concept of object feature set and dynamic searching policy is proposed. The design and implementation of it are both given. The framework working using result shows that it makes the testing more convenient and efficient with less resources and time cost...
With the development of Web service technology, SOA has so many applications in industries. How to evaluate a domain oriented service becomes an important issue at present. This paper puts forward an extended SOA (exSOA) architecture and a domain expert-based evaluation model for Web service. It evaluates the candidate service by considering the evaluation result from domain expert and the constraint...
In a large e-government system, different government departments have already created and are going to create a large number of heterogeneous databases. Only using data replication and synchronization technology as the low level infrastructure to maintain the huge system is very difficult to get satisfactory result. A data center constructed with Web Service technique and XML schema can give a good...
In this paper, we propose a user motivation model for Web search engines. We construct the user motivation model to assist the Web search engines, so that the efficiency and accuracy rate of information retrieval can be improved. The user motivation model combines the similar behavior models of the users based on the theory of anthroponomy and displays the returned results according to the clustering...
Saving data to 2-dimensional adjacent tables which are in memory or to database are adopted by most schemes when maintaining topology data dynamically. However, the adjacent tables would consume significant cost of the memory. Plus, network administration would have to do redundant and repeating work to compile the topology if services are rebooted, which would be absolutely inconvenient and ineffective...
Automatic network topology discovery is important for network management and network analysis in ITSM system. Issues like network environment configuration, performance testing and fault detecting all require accurate information of the network topology. According to the requirement of the ITSM system, in this paper we propose an efficient algorithm that is based on SNMP for discovering Layer 3 and...
In order to alleviate the burden of network administrators in the network resource management field, a network resource management system is designed and implemented based on the design idea of SNMP. This system which based on VC++ platform utilizes the principle of network communication and the feature of network resource, implements management of the IP addresses and the monitoring of the servers,...
The Google Company released Google Earth (GE), a stand-alone program that combines three major Google services (satellite maps, local yellow pages, and a vast database of statistics) into a single interface which allows zoom to street-level details anywhere in the world. However, GE can only provide high quality geographic information service for limited parts on the earth. In order to enhance the...
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