Applied Mechanics and Materials Vols. 198-199

Abstract: It is the largest specification effort ever in the history of PICMC association, which contains more than 100 companies participating, to work on ATCA technique. To be named as AdvancedTCA (ATCA), it is officially called PICMG 3.x protocol, which was stipulated by the PICMG organization in Dec, 2002. It is mainly targeted to achieve requirements for the next generation of "carrier grade" equipments, widely now used in telecommunication core or access networks [1].

Abstract: The research of software design, based on the supervisory control theory, is an important content in software cybernetics. The existing software model used in the software design with the supervisory control theory is Polynomial Dynamic System (PDS), which is transformed from SIGNAL files. This obstructs its widespread application. Extended Finite State Machine (EFSM) model is widely applied in software engineering field and it may alleviate the state explosion problem of Finite State Machine (FSM) to some extent. In this paper, the EFSM model is suggested to study software design problem. This paper proposed two kinds of software design problems based on EFSM model. For the first problem, a necessary and sufficient condition for software existence is obtained. For the second problem, a necessary and sufficient condition for software existence and an optimal algorithm to such software design are presented.

Abstract: Association rule mining is one of the most important techniques in data mining. According to the national standard of students’ health, the health condition of university student should be tested once every academic year. So a lot of testing data have been recorded in our university. This paper analyzes these data of freshman students by positive and negative association rules and finds lots interesting results. By analyzing these results, some suggestions are proposed to improve the students’ health condition, including targeted physical education teaching, establish a supervising system, and do exercises on own initiative.

Abstract: The data traffic needed to be transferred by APs is much more than the other STAs in the IEEE802.11 DCF networks. However, APs access the wireless link with the same priority as STAs, and thus the throughput between uplink and downlink is of great injustice. In this paper, an adaptive optimization scheme is proposed to achieve fairness between uplink and downlink flows. APs monitor the growing real-time data traffic, and when the network system is in heavy traffic, APs could adaptively adjust the contention window to achieve fairness. Detailed simulation results show that the scheme can effectively adapt to various networks different in data flow numbers and packet size, and consequently achieve fairness between uplink and downlink flows with the total throughput increased.

Abstract: Software developers have developed many effective programming methods. However, software errors are still inevitable in software products. Estimating the number of errors in software testing is important. It is an important parameter to calculate MTTF.Because the number of errors in program directly determines the reliability of the software, in order to improve the quality and reliability of software products, we need to eliminate the errors in software products. To do this, we must understand the types of errors and we should also know the number of errors in the software . three methods of estimating errors are listed in this paper.

Abstract: This paper proposed a virtual prototyping-based modeling method of standard parts library. After the design requirement analysis, the modeling approach was put forward. Then the parameter-driven method and its use method were then proposed. The classes object organization relationship was identified step by step. The fastening feature tree structure logical relationship was present as an example, which demonstrates that this method is obviously helpful to product design.

Abstract: This Article is based on the waterfall model of software development ,according to the mechanism of information management and knowledge-sharing in the virtual community which has been constructed analyze the platform of information management and knowledge-sharing in the virtual community, from functional and technical to explain the platform; on the count of this analysis the paper make the functional design, and build three-tier architecture about the platform of information management and knowledge-sharing in the virtual community, describe teaching modules, exchange and sharing of modules of education system in two pairs of the ER design, the module function design; finally clarify test content for the platform.Software development of waterfalls model[1] essentially is a software development structure, the process have a series of stage sequence, begin from requirement analysis, design, test, setup, to maintenance, each stage generates circulating feedback, if the some stage appears a problem and then return to guarantee the integrality.

Abstract: Considering the complexity of weapon and equipment development strategy and the requirement analysis of Hall for Workshop of Meta-synthetic(HWME), we analysed the flow of solving complicated problem of strategy decision using the methodology of meta-synthesis from qualitative to quantitative. Finally, we built the system framework of HWME on concentrating discussion manner.

Abstract: Through analyzing the development of Social-security system, the paper proposes one design proposal of the WEB system development based on LINQ. It uses three-tier structure to carry on the system development and carry on the operation for the database by LINQ. The applications of system prove that the system is operating well. It improves the management level of social-security information and it also confirms LINQ could greatly simplify the programming efficiency of system development and improve the access speed of database.

Abstract: The paper is focused on these thematic data index construction, and puts forward a kind of category data indexes for rapid queries for urbanization thematic data index. The corresponding metadata tables could be constructed as non-spatial data are stored in the binary format. This aim is to classify the data by the metadata information and to establish the classified index respectively for the attribute data. The experiments confirmed that the proposed the category index can create urban thematic data index, and can quickly query attribute data needed.