Applied Mechanics and Materials Vols. 58-60

Abstract: Based on neural network method and by using the relevant social and economic development history index data, this paper establishes the mathematical model and neural network model that is used to predict future land resource demand, and the network is trained by using data from 1992 to 2005. Accordingly, the trend analysis model, which is to predict and analyses the indicators of population, production value, GDP, etc., is also established, and applied to predict the construction land demand from 2010 to 2020. Here, taking the trend forecasting data of the population, production value and GDP as trained network input, it calculates the future land demand. The simulation result of this method is proved to be satisfactory after comparing it with traditional statistical model forecasting results.

Abstract: In the paper, for the variance component models we take the ordinary quadratic risk function, and consider the admissibility of the linear estimators of linear combinations of regression coefficients in the class of linear homogeneous and inhomogeneous estimators. We get the necessary and sufficient conditions for the linear estimators of linear combinations of regression coefficients to be admissible.

Abstract: A new quadrilateral arrangements for landmark Multi Dimensional Scaling (LMDS) is proposed in this paper. The proposed strategy for choosing the landmark points improved the accuracy which was the main flaw of LMDS. After employing this arrangement, the improved quadrilateral landmarks MDS (QLMDS) preserves the computational efficiency of LMDS and uses quadrilateral arrangement of landmark points to obtain a higher accuracy. To compare the accuracy and computational efficiency of QLMDS with classical Multi Dimensional Scaling (CMDS) and then the accuracy of QLMDS with LMDS, several simulations are presented. The results, apparently, show that QLMDS is as fast as LMDS, but with a higher accuracy which makes it a better choice than CMDS and LMDS.

Abstract: In this paper, we first introduce the characteristic and the comparison of H.320 system and H.323 system in video frequency conference system, expound the unique merit of video frequency conference system based on H.320/H.323 double agreement design in application, then describe with emphasis a typical principle and method of H.320/H.323 double agreement adapter design in video frequency conference system.

Abstract: Government decision-making is a complex and comprehensive problem. It needs to make judgments and develop policies combining with professional advices and supports on the base of the comprehensive analysis of all aspects of the data, the integrated consideration of existing conditions and development prospects and other factors. Therefore, the construction of government decision-making information system should be taken the solving of the information sharing and the collaboration between departments as the main target. However, the existing government decision-support information systems are mostly focused on auxiliary analysis of information, and information sharing and collaboration between different departments are still lacking. This paper proposes to build a government decision-making support and collaboration applications platform for network-based data sharing and multi-sectoral collaboration on the base of service-oriented architecture (SOA) technology. This paper designs a service-based system framework with three-layer structure, and models this platform based on unified modeling language (UML). According to this, a service-based major function oriented zoning decision support system has been achieved for major function oriented zoning application. The results show that the service-based platform design was better in the solution of distributed information sharing and users’ collaboration issues.

Abstract: In this paper, the process of upward mining in Baijiazhuang mine is analyzed by the simulation function in FLAC-3D software. Basing on the actual drilling column of the upward mining face in Baijiazhuang mine, the variation of rock pressure before and after upward mining is calculated and analyzed by means of numerical simulation model, and then the deformation and movement of the rock strata between coal seams before and after mining the upper and lower coal are further studied. Finally, the simulation results of studying the rock layer’s mechanical relationship and deformation condition is the same with actual mining.

Abstract: Because of the nonlinear of the cutting motor which is used in hi-frequency straight welded tube process, this paper designs a fuzzy control method used in the speed control system of the cutting motor. Furthermore, simulation test shows the control system that uses the fuzzy controller has better performances than that of the traditional PID control, which improve the dynamic performance, disturbance restraint performance and the steady precision.

Abstract: Under the background of the rapid development of computer technology and the gradual maturity of advanced manufacturing technology, three product design modes based on computer technology, which include product design based on concurrent and collaborative technology, product design oriented to mass customization and product design based on virtual reality technology, are discussed. Their respective basic design processes are analyzed and the features of three product design modes are also summarized. Under the conditions of economic globalization, product design modes based on computer technology are the key to sustainable development and rapid occupation of future market in the modern fierce competition between enterprises.

Abstract: The circuit that a high-voltage pulse is sharpened by an opening switch and a closing switch is designed. The electric exploding wire switch (EEOS) is adopted as the opening switch to steepen pulse primarily. When the EEOS explodes, the voltage passes through the gas switch which is used as the closing switch， and then is sharpened to high-voltage pulse on the terminal load. This high-voltage and high-current circuit is simulated by steps with the software PSPICE. The experimental results show that the rising time of the pulse steepened twice is nearly 1ns, and the peak voltage is greater than 200kV on condition that the preliminary voltage is 35kV. The results obtained from the simulation and the experiment are identical on the whole. As a result, this circuit has great prospects in the pulse mediation system.

Abstract: In order to resolve the modeling method of logistics network, a basic model named NGM is presented. According to some special characteristics of the real logistics network such as growth, preferential attachment, edge-weighted, and clustering, the basic model is improved and optimized. The modeling method of logistics is analyzed and simulated too. The results of the simulation show that the modeling method is more effective than the traditional logistics modeling theories.