Applied Mechanics and Materials Vols. 427-429

Abstract: I/O Consistency problem is one of the key issues which Multi-Cores Processor design must face. With increasing of core number and complicating of cache level, the probability of I/O coherence packets blocked would increase, which would decrease I/O system efficiency significantly. An I/O coherence maintaining method based on retransmission is proposed to improve reliability of the I/O coherence protocol. Experimental results demonstrate that this method can enhance the robustness of I/O coherence protocol effectively.

Abstract: DCOP (Distributed Constraint Optimization Problem) is currently the most widely used in multi-robot communication algorithm problem, Adopt algorithm is a kind of algorithm which is relatively perfect; it can transport messages accurately under the harsh environment of communication. It is completely asynchronous algorithm, through analyzing algorithm for local agents to obtain the global optimal solution, in the comparison of each algorithm can see that ADOPT algorithm not only can well solve the problem of communication failure, and the algorithm set up mechanism of terminate detection, it can make the algorithm stops on the optimal solution, and effectively solve the deadlock problem. The text use ADOPT algorithm to analyze how to solve the problem of multi-robot communication failure, and improve the algorithm to take messages more accurately and effectively.

Abstract: In order to solve the problem of the PSTN network and IP network interconnection, in the study of digital relay server-driven software system architecture based on low-level driver software point of departure from the digital relay server, the proposed media and letter between the two networksso that the signaling conversion server communicate with each other, in order to achieve the signaling protocol conversion between the two networks; design of a digital relay server to complete media conversion between the two networks, the interconnection between two networks.

Abstract: When IOT of agriculture combined with the social media, by drawing support of social media, agricultural IOT could be promote from industrial application tosocial applications level, make full use of social media platforms for the information of agricultural crops and products got from Internet of Things, and spread the information to get the user's attention, thus a favorable mechanism for social media marketing would be built.

Abstract: Since the 21st century, with the rapidly development of the Internet, it promotes the rapidly development of electronic commerce. In present e-commerce activities,it mainly includes government agencies and online shopping which draw people's special attention to it . This study analyzes the statistical data in a certain time the user access to online shopping site and puts forward that this law according with certain probability density distribution conclusion. This paper plans a table which pushed a compound probability distribution model through the basic probability density function in order to adapt to the search engine's rule.It finally applied the composite model to probability distribution of people use search engine successful and found that the use of composite model prediction value are at risk than other models. probability distribution of the users in a certain time shopping can be pointed out which has a certain guiding significance on the search engine marketing model in electronic commerce environment.

Abstract: The virtual reality is an advanced technology in the modern man-made environment. A three-dimensional virtual reality world is produced by computer simulation to make users feel as if they were personally on the scene. By building the virtual model and virtual construction process, construction control and management based on the virtual reality system can be used to improve efficiency of project management and construction, ensure construction progress, save cost, improve safety and reduce engineering risk, so as to provide guidance for engineering construction.

Abstract: The virtual construction is achieved in the virtual environment, and the virtual reality technology is the core technology in the virtual construction system. The virtual reality technology is a high-tech information technology which integrates the artificial intelligence, the computer graphics, the man-machine interface technology, multi-media industrial architecture technology, the network technology, the electronics technology and the mechanical technology. The technology aims to utilize computer hardware, software and various sensors to create a virtual environment integrating vision, hearing, touch and smelling, which makes users immersive in the environment. The operators are immersive in the environment and interact with it, obtain sensory stimulation through various media, and gain clear and intuitional understanding of the problems to be solved.

Abstract: Firstly, the current situations of E-commerces user experience evaluation model were analyzed. And then, fuzzy comprehensive analyses were introduced. After that, an improved E-commerces user experience evaluation model based on fuzzy comprehensive analysis was established. In improved model, user experience hierarchy model was created based on psychological-stratification, experts fuzzy evaluations of evaluation factors were integrated into fuzzy matrix by using the theory of Triangular Fuzzy Numbers. Finally an example is given to show the rationality and the effectiveness of the method.

Abstract: The terahertz wave is a kind of electromagnetic waves which locates between millimeter waves and infrared lightwaves, and the frequency range is 0.14THz~10THz. Terahertz is used as a carrier wave to communicate with each other because it has large bandwidth which can support Gbps wireless data rates. Therefore, terahertz communication technologies become research hot spots in recent years. However, its still rare in MAC protocol of terahertz ultra-high data-rate wireless networks at present. In order to realize wireless access of ultra-high data-rate under the condition of terahertz carrier frequency, a novel MAC protocol is proposed in this paper. The improved MAC protocol which makes the maximum data rates reach up to 10Gbps or higher is designed by new MAC control mechanisms, new time-slots allocation schemes and new superframe structure. Theoretical analysis and simulation results show that the new proposed MAC protocol of terahertz ultra-high data-rate wireless networks can operation normally, and the maximum data rate can reach up to 19.2Gbps. This maximum data rate is 2 times higher than 5.78 Gbps which IEEE 802.15.3c can achieve.

Abstract: This paper introduces a Web-based tutoring system for computer programming that provides an integrated environment for web programming. The proposed system is web-based. It provides an online editor for writing, editing, updating, and executing programming code, so the students can execute examples and practical exercises online, it can help a student navigate through the online course materials, recommend learning goals, and generate appropriate reading sequences.. In addition, it provides auto complete and syntax highlighting in editing code, which could help students to remember the syntax more easily. The proposed system provides communication and interactive forum among students and teachers. And it provides the teachers with an online exam system. It monitors, collects and keeps information about students performance and activities. Therefore, teachers can use the recorded information to keep tracking of the students progress.