Applied Mechanics and Materials Vols. 63-64

Abstract: Virtual organization is an important form of the cooperation between enterprises. Information technology is the technological base of the efficient and orderly operation of the virtual organization. This article, through the analysis of the demand in information system platform of horizontal integration, vertical integration and other different operation processes of virtual organizations, puts forward the structure of the information platform constituted by application service layer, support security layer and communication network layer, and does deep analysis of the composition content of different layers.

Abstract: Time synchronization is a key technology in wireless sensor networks. In this paper, aim at high-speed railway GSM-R network require higher real time, fault tolerance and band coverage way, presents a real-time fault-tolerant wireless sensor network time synchronization algorithm, using direct forwarding strategy, regression analysis and abnormal data filtering methods to meet the requirements of GSM-R network. Analysis and simulation show that the algorithm has good real-time and fault tolerance to meet the requirements of GSM-R network applications.

Abstract: Cognitive attacks, which influence the user’s perceptions and behavior, are more serious than physical or even syntactic attacks. We construct an attack model for cognitive Network based on scientific analysis of Network material system to visualize cognitive attack. The cognitive attack model consists of two parts: attackers and netizens. We formalize each element of the model. The cognitive attack example analysis illustrates the rationality of the model.

Abstract: Yueniang bridge is curve, slope and slant single span special arch bridge with diagonal crossing arch rib and curved girder. A spatial finite element analysis method was used in this paper. Static characteristics and stability was analysis and discussed by means of modeling, discrete element and determination. Concrete measures for suspender of curved bridge were also advanced. It can provide a reference for design of similar bridge.

Abstract: An avoiding obstacle fuzzy controller for AGV is presented in this paper. Multi-sensors are used to detect obstacles information. The fuzzy controller processes the distance of obstacles by using a 3×3 rule table. As to convert the fuzzy output into non-fuzzy value, Centre of Gravity Method (COG) is used to calculate an accurate control output. This fuzzy control algorithm can solve the problem of obstacle avoidance in unknown environment. And the AGV running path is smooth and the changing of speed is moderate.

Abstract: The "mistakes, forgetfulness, and negligence" accidents in Air Traffic Control (ATC) have a great impact on flight safety. On the basis of Fault Tree Analysis (FTA), the paper established the "mistakes, forgetfulness, and negligence" accidents in ATC fault tree, obtained all the minimal cut sets, and qualitatively analyzed the cause of accidents. According to survey data, the paper calculated the probability of the top event, as well as the probability importance degree coefficients and critical importance degree coefficients of basic events, and quantitatively analyzed the cause of accidents. The results show that the weak sense of responsibility, poor safety awareness, unsound rules and regulations, inadequate enforcement of rules and regulations, and high control office noise are the main factors leading to the accident. The paper provides ATC units with recommendations to establish solutions to "mistakes, forgetfulness, and negligence" accidents in ATC.

Abstract: The most important feature of cascaded hydropower investment, intertemporal optimization, is neglected to some extent. This paper focuses on how to make an optimal decision on intertemporal investment based on the case of cascaded hydropower. I incorporated intertemporal investment and financing constraints in dynamic programming, and proposed a new objective function. As a result, an intertemporal optimal dynamic model is established. The model highlights the fundamental framework of dynamic programming on cascaded hydropower development. The framework is robustly suitable to improve investment efficiency with respect to intertemporal optimization.

Abstract: In this paper, a new network security situation intelligent analysis prediction method is proposed, which applies GM(1,1) model and BP neural network model in the analytic prediction field of network security situation information, and combination and optimization is performed to it to improve the accuracy of network security situation prediction. By analyzing and calculating the great amount of information acquired from network security situation evaluation system, it is able to make prediction on the current security situation of network system and the its future change trend, and make and implement relative response strategy according to prediction results, and reduce the harm from network attacks and improve the emergency response ability of network information system, so that we can make preparation before great damage occurs and reduce or avoid any possible attack to ensure the smooth running of system. The experiment results show that this method is a better solution for network security situation prediction.

Abstract: Research the MVC pattern, Struts framework and Struts framework application in web development mainly. Design and realize On-line bookstore system. The testing results show that using Struts framework to develop Web systems can greatly improve the efficiency of system development, and can increase the stability, expansibility and maintainability of the system greatly.

Abstract: This article embarks from the connotation of supply chain performance and its evaluation indexes’ present research situation, selects the key indexes of supply chain performance evaluation, constructs indexes system of supply chain performance evaluation, and uses fuzzy comprehensive evaluation algorithm to make appraisal on the key indexes. Finally through computation and analysis of specific cases to show this appraisal method is helpful for enterprise improving their overall supply chain performance.