Applied Mechanics and Materials Vols. 182-183

Abstract: The vehicle simulation model of 78-DOF is built based on ADAMS/CAR. Both rationality and accuracy of simulation model are verified by comparison analysis methods between real vehicle test and virtual simulation test. The mathematical model of wind pressure center and lateral aerodynamic force are formulated by using the STEP function. The simulation results indicate that the vehicle has the excellent crosswind stability and congruent dynamic response, which agrees with United States (ESV) standard.

Abstract: In order to solve the problem of large-scale multimedia content delivery, we present Multimedia Content Delivery Network (MM-CDN). For providing multimedia services with high quality in MM-CDN, the traditional request routing approaches in CDN face two key challenges, namely performance and cost. To balance the tradeoff between performance and cost in MM-CDN, we propose an improved request routing approach. First, based on the idea of network coordinates, the computation and transfer costs of different server clusters are computed depending on the network and server status change. Then, all the server clusters are reorganized in the coordinate space. Finally, user requests can be adaptively redirected to the server clusters with minimum cost without sacrificing performance. Computational results show that the effectiveness of our approach with acceptable time performance.

Abstract: In this paper, we propose an automatic load-balanced partitioning strategy for parallel multilevel fast multipole algorithm(MLFMA) based on distributed-memory architectures to solve the large scale electromagnetic scattering problems. We focus on the automatic load-balancing partitioning strategy because that our original scheme requires that users input the transition level, which is usually determined on the users’ experience and sometimes lead to a bad load-balancing partition. By introducing the automatic load-balancing algorithm to our pervious partitioning technique, our implementation can automatically achieve the best load-balancing and consequently attain better parallel efficiency. To present the effectiveness of the new strategy, we analyze results of the previous implementation according to different inputs of transition level and compare them with the result of implementation using the new algorithm.

Abstract: This paper expounds the key technology and related process of GIS system development using Mapx and SQL server, combining with the characteristics of GIS. Detailed implementations are given using Database storage technology for ground objective graphics primitive vector data, and then explain the interaction between ground objective graphics primitive data and property data.

Abstract: In the CNC machine tool control systems PLC plays an important role,this article describes the classification of the PLC CNC machine tools,the role of information exchange and application of methods, that the PLC has become indispensable for high performance CNC control device.

Abstract: Workflow management systems, a relatively recent technology, are designed to make work more efficient, integrate heterogeneous application systems, and support inter-organizational processes in electronic commerce applications. This paper presents an infrastructure and a mechanism for achieving dynamic Inter-enterprise workflow management using e-services provided by collaborative e-business enterprises. E-services are distributed services that can be accessed programmatically on the Internet, using SOAP messages and the HTTP protocol. In this work, we categorize e-services according to their business types. E-service requests are specified in the activities of a process model according to some standardized e-service templates and are bound to the proper service providers at run-time by using a constraint-based, dynamic binding mechanism.

Abstract: The current process hiding and detection technologies are analyzed, and the mechanism of cross-views discrepancy utilized by Strider GhostBuster are studied in detail, and based on Hardware-assisted Virtual Machine (HVM) a new framework for process detection is proposed, namely HCPD, whose effectiveness and integrality are verified through experiments.

Abstract: The future search engine should understand the content of Web pages and implement logical reasoning, in order to achieve complex search and correct results. This paper introduced relative theory of component and RDF, created a conceptual architecture for semantic search engine, and discussed its components and their relationships. Finally, advantages of this architecture are proved.

Abstract: This paper analyses three communication technologies, such as GPRS, satellite or shortwave on the basis of the characteristics of data transmission in regional grain emergency system. Especially, shortwave is suitable for emergency communications because of its high invulnerability and long communication distance. This paper presents a scheme for wireless data transmission in regional grain emergency system using shortwave.

Abstract: In this paper, the control for predator-prey model with stage-structured predator is studied. The controllers and the parameter estimation update laws are established explicitly which make the system under consideration stable.