Applied Mechanics and Materials Vols. 401-403

Abstract: Research results and assessments actuality of virtual maintenance training are introduced and the shortcomings of the current maintenance training assessment are analyzed. On the basis, virtual maintenance training effect evaluation method based on cognitive is putted forward, focusing on the specific implementation methods and procedures. With a certain type of equipment virtual maintenance training system for the learning of the knowledge of the fundamentals of the structure of "high and low balance mechanism" and "direction mechanism", virtual maintenance training effect is evaluated by comparing two training means learning effect of traditional teaching methods and virtual maintenance training.

Abstract: In street lighting system, the light pole controllers were used to monitoring and control each street light. The controller nodes were installed at each lighting pole and make up a network with RTUs. In this paper, a randomly forwarding routing strategy was proposed based on the controller network features. The controller nodes were divided many clusters according to the substation power scope. In one cluster, the controller nodes topology is mainly star structure. When a controller node received a packet, it randomly delays a period of time and decides forwarding packet instead of immediately forwarding. The decision is based on the packet propagation direction and other nodes whether sending or not. The randomly forwarding routing protocol were simulated in OMNeT++ environment and compared with the flooding protocol. The results show that the delay of proposed protocol is lower than that of flooding. The proposed protocol also has some special features such as simple, not need to maintain net topology and complex path discovery algorithms.

Abstract: The special class of wireless sensor networks for monitoring power transmission lines may extend for hundreds of miles in distances. The sensor nodes in this class of networks are deployed along narrowly elongated geographical areas and form a chain-type topology. Thus routing protocols in such environments must be kept as simple as possible. In this paper, we present the Simple Ant Routing Optimizing Algorithm (SAROA) to offer a low overhead solution in optimizing the routing process. Four improved strategies were used in our approach. During the route discovery we have used a new local search mechanism, in which each node broadcasts a control message (FANT) to its neighbors, but only one of them broadcast this message again. During the route maintenance phase, we only use data packets to refresh the paths of active sessions. Finally, the route repair phase is also enhanced, by using a deep search procedure as a way of restricting the number of nodes used to recover a route. A broadest search is only executed when the deeper one fails to succeed. The simulation results show that the enhance algorithm can effectively jump out of the local optimum and satisfy the tolerable delay in network-wide data collection.

Abstract: Security in EMM sublayer is an important part of LTE security system. This paper is developed into three part: researches on Security Mode Command and Authentication process, introduction to key hierarchy and analysis on Integrity Protection and implementation of encryption / decryption.

Abstract: The general NC (Numerical Control) system of quasi flexible production Line is researched based on motion control card operated by the DSP (Digital Signal Processor) and industrial PC (Personal Computer) running on system platform of Windows. The hardware platform of general NC system of quasi flexible production Line is built with industrial PC and motion control card, and the industrial PC is the upper computer. The software platform of general NC system of quasi flexible production line is compiler environment of Visual C++. Using programming technique of object-oriented and modularized, the network communication of data exchange for coordination and scheduling module in general NC system of quasi flexible production Line is built based on multi-threaded technology.

Abstract: In this paper, resource registry and management framework based on LDAP is proposed. The function, external interface and internal structure of the framework are firstly introduced. Then, the data naming, data model, data operation, security mechanism and advantages of LDAP are introduced in detail. At last, a typical application based on the framework is proposed. The framework provides a better way to manage resource and achieve resource sharing.

Abstract: Abstract. LTE-Advanced is positioned on the higher data rates and a greater system capacity. In order to meet the goal, LTE-Advanced will undoubtedly introduce new wireless technology. The relay technology as key candidate technology of LTE-Advanced system can brings greater coverage and system capacity for residential area. Cooperative relay signal processing methods include amplification forward relay and decoding relay. So, proposed improve the cooperative relay based on the space-time coding, introduced precoding in front of the relay data sent and find out the optimal space-time coding transmission. Through the computer simulation, fully verified the feasibility of improved space-time coding transmission algorithm.

Abstract: Based on the analysis of the structure of the 3DS file, this paper uses recursive method to collect content of 3DS file and designs the data structure to save them. Then, reading and drawing principle for 3DS file is studied by DirectX 11. Finally, the system for reading and drawing 3DS file is designed and implemented based on DirectX11 in VS2010, and achieves better results.

Abstract: The system structure of apparel industry chain collaborative work platform demands dynamic and expansibility. Study is made on component management technology, and the correlation model of platform component is established through introduction of relying-on information and information being relied on, so that relevant components can be collaboratively aware of the changes happening on a certain component; component classification and component library management system based on XML are also established. Study on integrated development technology of business components under the platform integration framework is made on this basis, integrated development environment for business components is established, and the above achievements are applied and verified in development of apparel industry chain collaborative work platform.

Abstract: Peer-to-peer control network relies on location mechanism that conducive to resources sharing among robotics. The commonly using overlay network topology method based on interesting group in the existing peer-to-peer control network should be accomplished collaboratively, which increases system traffic and occupies large bandwidth. The paper brought out a routing model in peer-to-peer control network based on Successful Accessing Rate (SAR). The model organizes user group based on SAR and conducting resource searching in high-low order. In this model, each node runs independently, which decrease system maintenance cost and provides new idea to solve free-rider problem. Simulation results show that the model effectively improve system recall rate and solve fairness problem.