Applied Mechanics and Materials Vols. 543-547

Abstract: In this paper, we have introduced a multicast constellation design scheme using combination network coding. This scheme employs combination network coding (CNC) to guide the constellation design, under multi-objective such as multicast throughput and coverage performance. The constellation design procedure is given in two stages, topology and constellation. The constellation design result under this procedure shows that the multicast constellation can meet the throughput and coverage performance requirement.

Abstract: Controller Area Network (CAN) is widely used in automotive and industrial areas. To give guidance in the design process, CAN bus communication model is established using Matlab/Simulink^TM. Considering the error frames on the bus, the formula that calculating CAN response time and bus load is revised. The relating performance indexes of CAN bus is gained separately through calculation and simulation, it concludes that the CAN bus communication model can efficiently simulate the message transfer sequences in the real bus, and achieves an exact result of the performance analysis of the CAN bus system.

Abstract: From the starting of understanding the concept and characteristics of the Internet of Things, I propose the concept of the intelligent digital campus according to the research status grasping of the Internet of Things. The intelligent digital campus based on the Internet of Things can achieve automatic recognition, library borrowing management, multimedia classroom and laboratory management and campus consumption management. It provides more efficient services for teachers and students work, studying and daily life.

Abstract: Online reviews as a new textual domain offer a unique proposition for sentiment analysis. The reviewers usually give a whole rating score to the product. The potential customers tend to make decision according to the reviews. Previous works mainly focus on the summarization of the rating and sentiment of reviews. However, they ignore an important question. The whole rating can be regarded as linear regression of different aspect ratings. High aspect rating and low aspect rating compensate each other. Therefore, previous works are coarse-grained analysis. This paper first proposed a weak supervised learning method to extract implicit aspect with aspect seeds. It then formulates the aspect rating problem as a linear regression model. Finally a gradient descent method is proposed to handle the problem. Different datasets are collected. Experimental result in the datasets demonstrates the advantage of the proposed model.

Abstract: This paper presents a new MAC protocol the probability detection CSMA protocol for wireless sensor network based on the request-response mechanism. Builds the corresponding mathematical model using the average cycle method, and get the mathematical expression of systemic throughput through a rigorous mathematical derivation and makes the computer simulations. Simulation results show the correctness of the theoretical analysis and the effectiveness of the protocol; meanwhile, the protocol this paper presents increases the reliability and stability of the system through increasing RTS-CTS request-response mechanism and ACK handshake signal, thereby improving the systems transmission quality.

Abstract: S-box is the core of block ciphers. Its cryptographic properties impact on the security of block ciphers directly. From S-box inherent weaknesses, this paper adopt Fractal theory, and put forward a method based on non S-box transformation to change the S-box using sequence, that is, using the sub-key of each round to determine the S-box sequence by Fractal theory, then the effects different keys in each encryption come true. The method improved encryption algorithm, enhanced encryption strength and increased the algorithms security.

Abstract: In ad hoc networks, ZRP (Zone Routing Protocol) combines a proactive routing protocol with an on-demand routing protocol. Proactive routing is adopted in the intra-zone, and on-demand routing is adopted in the inter-zone. During the process of the inter-zone routing maintenance in ZRP, there is a low reliability problem. So NHRP (New Hybrid Routing Protocol) was proposed, and the protocol reliability relationship between ZRP and NHRP was demonstrated by a comparative analysis on route reliabilities of ZRP and NHRP. The theoretical analysis shows that NHRP takes higher reliability than ZRP.

Abstract: With the rapid development of web 2.0, online communities have become an important way to disclosure and spread the public sentiment. Opinion leaders in online communities play an important role during the formation of public opinion. The paper designs and implements an opinion leader detecting method based on an improved PageRank algorithm. The improved PageRank algorithm uses link relevance to define the weight of the link between users. The first step is crawling data from online communities and preprocessing them. Then construct the weight matrix by calculating link relevance between users. Finally, use the improved PageRank algorithm to rank users and detect opinion leaders. The experimental results show that, compared with the baselines, the proposed method can effectively identify opinion leaders in online communities.

Abstract: In order to solve the problem of queuing to buy tickets, no change and waste a lot of valuable time, the electronic ticket system based on QR code identification technology is designed in this paper. The system architecture of bottom-up followed by: physical hardware layer, Android OS layer, image capture and network processing layer, QR Code decoding layer and user interface. In order to achieve the application of QR code and the Android mobile phone in the electronic ticketing system, the system adopts C/S mode and the method of qRCodeCommon generates QR code. The advantages of this system are to use electronic tickets instead of paper tickets, cost savings, while preventing the loss and have great significance to other areas of the ticketing process.

Abstract: On the basis of further analyzing the operational mechanism of the existing intrusion detection system model, in allusion to the existing problem the powerless ,high false negative rate, low detection efficiency and the lack of the rule base automatic extension mechanism to unknown aggressive behavior for existing detection mechanisms, Combining the relevant knowledge of data mining technology, then to design one improved network intrusion detection system model based on data mining, combined misuse detection and anomaly detection. Finally, we carry out a detailed introduction to the associated modules of work processes and work steps.