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At present, using the computer to imitate the complicated circumstance of Urban rail transit, to study the theory and methods of Urban rail transit operation and control, is really an economical, reliable and safe method. Therefore, from the viewpoint of both academic research and realistic application, building and carrying out the test model of ATO (Automatic Train Operation) System is of strong...
This paper is dedicated on the system-level thermal design and modeling for AMS-02 (Alpha Magnetic Spectrometer) avionics, with the goal of obtaining a reliable thermal control system. Electronics system thermal design is illustrated with the combination of both passive and active thermal control concepts. Detailed TMM (Thermal Mathematical Model) and GMM (Geometric Mathematical Model) for main radiator,...
Event-based production process modeling in Manufacture execute system is one of the main challenge in Manufacture Execute System. In this paper we introduce one of the event-based production process models which first define several element events and then make multi-meta-events based compound event an abstraction of real-world production process. This allows us to make simulation and modeling of...
Visualization is recognized as a fundamental element in scientific and engineering fields, and has being found wide applications in many areas such as medical care, meteorology, biology and geology. The dataflow model of visualization process is described, and a visualization technique is introduced to construct the complex geological bodies. The reconstruction process of geological bodies is greatly...
Ant colony optimization(ACO) provides an effective way to solve combinatorial optimization problem. However, with the complexity of the problem increasing, the ACO algorithm needs considerable computational time and resources to improve the good quality of solution, and this rarely satisfies the requirement of real-time computing in M&S (Modeling and Simulation) area. Parallel implementation of...
The test resource models based on Multi-agent have good reconfigurability and self-adaptability. The models based on Multi-Agent are usually devoloped by Multi-agent Systems Engineering(MaSE) methodology. The MaSE is studied in this paper, then the characteristics of a kind of type of test resource are analyzed, and its model based Multi-agent is built using MaSE. The analysis phase and design phase...
On the basis of SIMetrix/SIMPLIS simulation platform, the computer model of a kind of three-phase multilevel current source inverter (MCSI) was developed by using hierarchy design. In the control system, the multi-carrier PWM modulation strategy was adopted and tested, the current-balance control for intermediate DC-link inductor was implemented on the principle of redundant switching combinations...
The power curve of wind turbine power is an important indicator to assess the efficiency of the generating units. And the power curve has been widely introduced in the power forecasting of wind farm. In order to improve the accuracy of the power curve modeling, a maximum likelihood modeling of power curve based on mathematical expectation has been proposed in this paper. With the measured data from...
In order to make the simulation model close to the prototype bus, two modeling methods are used in this research. The Semi-empirical simulation models, which are based on the test results, are adopted for the key components or assembly such as the engine, tire etc. and the theoretical models are adopted for the general assembly and components. The power train layout is the same with the prototype...
As WAP net, the anytime and anywhere wireless manner to access internet, used by more and more clients, it is essential to evaluate the WAP systems' performance during its design phase for proving they have adequate capacity to support potential load. In this paper we use Performance Evaluation Process Algebra (PEPA) to evaluate a typical WAP system's performance. The approach is more convenient,...
With the advent of the information society, various archives management software has seriously affected the development of the whole system. In the development of archives management information system, the first step is modeling. UML has actually become the industry standard in the field of system modeling at present. However, the lack of precise semantics makes it difficult to analyze and validate...
The function of the new bearings with RFID card is introduced in this paper, five models of the new bearings with different size of RFID cards are set up by use of Pro/ENGINEER with good visualization, the finite element analysis of the new bearings are studied by use of Pro/MECHANICA, by comparision with five plans, the best plan is chosen. This practical project is helpful to study the virtue modeling...
Article Bee Colony (ABC) is one of the most recently introduced algorithms based on the intelligent foraging behavior of a honey bee swarm. This paper presents a variation on the original ABC algorithm, namely the Cooperative Article Bee Colony (CABC), which significantly improves the original ABC in solving complex optimization problems. In this work, CABC algorithm is used for optimizing six widely-used...
After introduced the C-C method of embedding window in state space reconstruction, this paper mainly calculates and analysis different time series samples of the Lorenz systems and Rossler systems with the method. The conclusion tells us the choice of reconstruction parameters with the C-C method is uncertain. So the embedding window theory is doubtful, and the independent choice of the state space...
The increase of injection pressure leads to raise the contact stress of tappet roller body and emerge more serious abrasion problem. The study analyzes the movement regulations of cam roller body. The finite element calculations of contact stress on cam-follower with follower rotation are carried out with the FEM software. This study finally gets the distribution regulation of cam-roller and the influences...
For image denoising and edge keeping, an adaptive diffusion coefficient scheme based on the traditional P-M model is proposed in this paper. The edge detection operator which reflects the edge information is introduced to obtain the optimum gradient threshold, not as same as using the constant value K in the classical diffusion coefficient equation. Experimental results either from the ideal images...
According to the characters of the logistics center location project evaluation, considering that the incomplete and uncertain intraval attribute information of the logistics center location evaluation can be reflected effectively by the traditional extension decision-making model, Extension decision-making model with grey interval number is proposed based on the grey system theory. At the course...
In order to improve the retrieval rate of the original contourlet transform based texture image retrieval system, a contourlet-2.3 transform based texture image retrieval system was proposed. Generalized Gaussian Density (GGD) model parameters were cascaded to form feature vectors and Kullback-Leibler distance (KLD) function was used for similarity measure. Experimental results on 640 texture images...
This paper is concerned with the numerical solution to a class of unstable nonlinear Schrödinger equations. A conservative numerical scheme is devised, and three of its discrete conservation laws are proved. Meanwhile, stability and convergence of such scheme with second order convergence rate of time and space are proved by the energy method. In addition, a numerical example is given to demonstrate...
In this paper, university network security evaluation system based on fuzzy AHP evaluation model, with examples given using the evaluation model for network security assessment procedures and methods. Evaluation results show that the proposed approach is feasible and guidance.
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