Advanced Materials Research Vols. 756-759

Abstract: The Web of Things (WoT) is a refinement of the Internet of Things by integrating heterogeneous devices not only into the Internet (the network), but into the Web (the application layer). With the expansion of applications and devices, WoT Gateway Middleware is bearing more and more pressure from data processing, and therefore the WoT gateway middleware takes more time to respond to the requests of applications. A data collecting and caching mechanism is an effective solution to this problem. In this paper, we begin by describing the gateway middleware architecture with the focus on data collecting and caching functionality. Then the data collecting and caching (DCC) functionality module is discussed in detail. The DCC module supports three kinds of data collecting and caching modes: fundamental mode, configurable mode and adaptive mode. We finally demonstrate how these three modes work. A SMART HOME system is developed as the implementation to verify and discuss the proposed mechanism.

Abstract: With the development of Internet technology, the increasing of the application service makes the enterprise network management and security more and more complex. Based on it, the enterprise portal needs a system with high performance for identity authentication management. In this, implements the research of unified identify authentication system through LDAP, designs a rational structure of the directory tree. Thus, All the application servers use the user information in the same directory. By the manner, the problem of disagreement and larger maintenance burden can be solved and the system security can be improved.

Abstract: By referring to the widely used web application frameworks on JavaEE, a description and transformation approach is proposed to resolve the problems of the transformation from platform independent models to platform specific models. To achieve model transformation, mapping rules can be defined according to the structure of the target model. Specific technologies of target application domains have less influence on the use of this approach. The experiment shows that the approach captures the essence, process and requirements of model-driven architecture, and thus can be used widely as a new guidance for model transformation.

Abstract: One fundamental task of wireless sensor networks (WSNs) is to save sensor power, and try to prolong the lifetime of WSNs. Traditional routing protocols are almost based on homogeneous WSNs, all sensors are use single hop or multi-hop to transmit data to base station, which lead to overload sensors next to base station, thus appear energy hole and made WSN outwork. In this paper, we use a new novel mobile collectors mobile strategy method to prolong network lifetime, and reduce hot-spot effect around base station. We propose the routing method can effectively balance the network sensors energy depletion, more save energy and longer whole network lifetime compare to LEACH.

Abstract: User-interactive question answering systems are catching more and more attention, however users complaints arise within it from such problems as unfair compensation. This paper focuses on a π-calculus-based formal model for the complaint process of a user-interactive question answering system. The formal model is verified by employing MWB tools so as to demonstrate the deadlock-free and other properties. The research results are of special significance to the comprehensive formal analysis of the user-interactive question answering systems.

Abstract: In order to satisfy the requirement of the underwater acoustic positioning system for offshore oil exploration, a design idea for water surface communication system of ultra short base line (USBL) positioning system. The main function of this design is to achieve high-quality communication with underwater acoustic responders. The hardware adopted JZ4760 and the FPGA of altera as the cores. Gold sequence direct sequence spread-spectrum was used on communication system, while modulation was PSK. An appropriate spread-spectrum synchronization mode was presented for the system. MATLAB-based simulation and experiments show that the system is working reliably.

Abstract: Study of Virtual Test Bed theory is the prerequisite for further research and application. Contributions to its technology and implementation come from many directions and from many projects. The purposes and significance of Virtual Test Bed are described. The goals are analyzed. The conceptual architecture with generic relationships as the primary rack of Virtual Test Bed is build based on the hierarchical relationship between the concepts in simulation field, and the framework is proposed which lays the foundation for simulation system development based on Virtual Test Bed.

Abstract: The mathematic model of third-order software phase locked loop formed by three-parameter loop filter is analyzed and designed. Then, in order to solve the problem of redundancy frequency analysis bandwidth when carrier tracking, a variable data ratio software phase locked loop is studied. Finally, the method is simulated and analyzed. The simulation results demonstrate that the software phase locked loop with variable data ratio can effectively reduce the operation capacity and improve the management efficiency of the software phase locked loop.

Abstract: Under the network environment, it inevitably exists inconsistency and dynamic information in users requirements because of the complicated and volatile network, update, restructuring and so on. This paper studies how to handle the inconsistent information and keep correctness of the requirement goals from the users. It also provides relevant rules of model evolution under dynamic environment. With maximal consistent set, the inconsistent information can be reserved to keep the indeterminacy in the early stage and expand the function of the software. It is helpful for the next step of the software development.

Abstract: Software testing play a significant role in modern software development and maintenance process, which is also an important means to ensure software reliability and improve software quality. With the continuous improvement of quality requirements of the software products and software engineering technology become more sophisticated, software testing has been participating into every phase of software lift cycle, become more and more important in software development and maintenance. DB2 Performance testing consists of four parts, which are environment setup, workload run, data measurement and environment clean up. Before all the operations are done manually and need about two hours continuous attention. Whats worse, even three times a day. This mechanical and complicated procedure is clearly unacceptable. This paper put forward a reusable automated testing framework based on IBM automated testing tools RFT to achieve the whole testing procedure automation. It reduces the count of human-computer interaction and greatly improves the efficiency of DB2 performance testing.