Applied Mechanics and Materials Vol. 696

Abstract: With the rapid development of mobile communication, the GPS (Global Positioning System) which provides real-time global positioning system has not been able to meet the needs of the indoor accurate positioning. Through simulation, this paper implements the method of indoor three-dimensional positioning based on RSSI compared the positioning accuracy under several kinds of noise. We achieve the good indoor three-dimensional positioning method with the combination of cost, positioning accuracy and positioning precision through the filter and secondary positioning which establishes special propagation model for various different environments.

Abstract: The growing demand for location-based services promote the development of positioning technology, but the traditional two-dimensional positioning has not fully meet the actual demand, three-dimensional positioning and has more practical significance and application prospects. RSSI-based ranging technology is a low-cost distance measurement technology and low complexity, has been widely used in wireless networks based on the distance of positioning technology. In this paper, through detailed analysis and Research on the effect of RSSI, simulation implemented based indoor positioning. Experimental results show that after eliminating the effects of environmental factors, after mean filtering and data processing Gaussian model range accuracy has greatly improved, positioning error is smaller.

Abstract: With the gradual promotion of triple-place services and development of network technology, digital TV is gradually penetrating into daily life from conceptualization. Among them, the sharing of home entertainment information through multiple-screen interactive system is one of the most important components in digital home networks. This study firstly deeply analyzed the system architecture and functional units of DLNA; and then proposed one possible technical solution to implement multiple-screen interactive system in NGB TVOS1.0 based on DLNA agreement and characteristics of smart TV operating system. With this solution, multimedia resources like video, picture and music could be shared, controlled and managed among smart phone, personal computer and TV through network.

Abstract: Current remote attestation schemes in trusted cloud computing lack of dynamic measure scheme of virtual computing nodes. In this paper, by the analysis and comparison of existing remote attestation technology, we propose a trust measure of virtual computing node running state, and a remote attestation scheme based on the trust measure results and CP-ABE attribute access control. By RO security analysis, and a simulation, we verify the security and efficiency of the program. The trust measure of platform running state is mainly based on the trust rating of the programs running on the platform, and a total trust value of the platform by an algorithm. The trust measure of virtual computing node running state is mainly based on the trust measure of the programs running on the platform and CP-ABE attribute access control. The remote attestation for the trust measure of platform running state is based on CDH problem. In this paper, we carry out simulation experiment with different proportions of non-credible nodes and the experiment results verify the trust evaluation efficiency of the scheme on the virtual machine.

Abstract: This paper briefly describes the main ideas and implementation of technology strategy of Embedded real-time system security level assessment which is important part of mechanism to system flexibility based on embedded real-time system, designs the embedded real-time system security level assessment system based on pattern matching for the characteristics of embedded real-time systems. By building security level assessment system and simulation testing environment based on RT-Linux real-time operating system, the impact of Embedded real-time system security level assessment strategy on performance of RT-Linux was tested.

Abstract: In mobile wireless communications, the received signal power is modeled as a combination of path loss, shadow fading and small-scale fading. In previous studies, the lognormality of the shadow fading is generally explained as a multiplicative model. In [1] the author proposed an additive model as a physical basis for shadowing within an "extended local area", where the shadowing can be written as the logarithm of the power of the plane waves. In this paper, based on the additive model, we focus on the correlation of the shadow fading in two extended local areas, the analytical expressions are presented for the correlation coefficient (ρ) of the shadow fading.

Abstract: The early performance analysis of architecture can effectively avoid the risk of redesign when the performance cannot achieve the goal. As the absence of information and data in the early time, there are large numbers of uncertainties. From the analysis of uncertainty sources and quantifying combination, the performance probability integral formula can be derived, which is essential to compare the architecture performance. This formula describes uncertainties by the form of probability.

Abstract: Taiwan has come to an aging society, dementia of the elderly has become a major concern of the community. The symptom causes a significant reduction of the hand-eye coordination and memory abilities. The hand-eye coordination ability involves many nerve systems. The brain perceives things through the eyes and acquires various information through the touches by different parts of the body, and then makes synthetic analysis before giving an executive order. Therefore, using fun interactive games to activate the hand-eye coordination and memory ability can delay the onset of dementia. In this modern technology era, using information technology to improve the training facility and better the approaches has become a trend. In this study, software programs coded in C# and Flash are developed to work on the Bluetooth ball hardware to facilitate the rehabilitation. The basic principle is use the reaction from the Bluetooth ball’s swaying or swinging to drive the movement of the objects on the computer screen, making the supposedly boring rehabilitation much more fun and vivid in the interactive multimedia environment, thus gaining better treatment effect. Also, RFID, Internet and databases can be integrated into this facility to provide patient identification and data storage for references in making rehabilitation training programs.

Abstract: The information extraction mode based on machining feature was presented for studying information extraction of part process model in the 3D CAPP system. The classification and its data structure of machining feature were investigated for defining the matching rule about the features. The feature authentication were availably fulfilled by converting the correlations of geometric topological into surface-edge adjacency graph for the part model, and the corresponding parameters extraction of feature were derived from traversing the feature tree of application development CATIA. The whole feature recognition process and parameter extraction process can become more directly and effectively by adopting the method of comparing machining feature with the predefined feature matching rules of the feature database.

Abstract: As the tunnel project has the characteristics of concealment, complexity, uncertainty and the larger investment risk, whose insidious danger is outstanding especially in the construction process. It is important for the safety of the construction process to determine the potential risk and minimize the risk using reasonable methods. Based on the experts investigation, 3-hierarchy and eighteen factors’ evaluation index system of risk assessment is established through the improved analytic hierarchy process. The results show that this method is reasonable and can greatly reduce graded difficulties.