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In this paper, the parameters effect on resonant frequency of MEMS piezoelectric cantilever beam is studied by FEA simulation, which is aimed to provide estimation of the frequency error using simple beam formula for piezoelectric cantilever beam based vibration energy harvester. In the simulation, piezoelectric vibration energy harvester is simplified to a thin silicon cantilever beam with a proof...
Value-added tax revenue occupies an important position in China. The efficiency study of value-added tax has important practical significance in the critical point of Chinese value-added tax transformation. Using BCC model we estimate Chinese value-added tax comprehensive efficiency, pure technical efficiency and scale efficiency from 1995 to 2008 from a macro perspective. The study shows that value-added...
Online medicine sale is an important form of pharmaceutical enterprises in developing e-commerce. As the particularity of the medicine compared to other products, how the customer judge the quality of the medicine sold by online pharmacies have received special attentions. The paper analyzes the process of transactions between online pharmacies and customers using the method of signaling game and...
Maintenance policy should be selected reasonably to reduce operation expenditure and increase production benefit, and in this flow all the related factors need considered. Usually, this work depends on RCM logic decision. This paper adopted the set pair analysis method to establish multi-attribute decision-making model of maintenance policy, so as to make the choice of maintenance policy effective...
In order to solve the problem that super-high pressure compressor pipeline system had serious vibration and noise pollution, finite element method was used in this paper to have system vibration analysis and a vibration control program was designed by changing system inflexibility. On the other hand, in order to improve the efficiency of simulation modeling, the ANSYS parametric design language (APDL)was...
In this paper, the author has discussed the optimum industrial cooperation problem in the background of multilateral regional cooperation. The problem of the optimum industrial cooperation has been converted into a mixed-integer linear programming model by the author who has synthesized the influence of the following factors: the connection between the cooperation industry and other industry, the...
In this paper, the author proposed the concept of incomplete and fuzzy information systems based on incomplete approximation spaces and fuzzy sets, and analyzed the approximate class-precision and boundary in rough set systemically, via introducing the thought of inner & outer boundaries and inner & outer approximate definable sets combining rough set with fuzzy set, variable precision theory,...
Both of the lattice structure of the concept lattice and hierarchical models of the quotient space can be used to layering, and can be obtained figures under certain conditions. Because of the close links between the above, this paper uses the basic method of the lattice structure, upgrades the direct intersection concept at first, then makes up the additional points for this layer, and searches the...
To the vast condition information variables of high dimension obtained from condition monitoring, the condition information extraction model is studied. Only cross correlation is considered in current condition information extraction (such as principal component analysis), which is excessively broaden the hypothesis condition of the model. It doesn't agree with the fact. So the dynamic principal component...
Risk assessment of project is important basis of project implementation phase risk management countermeasure choice, the core of which is to have qualitative and quantitative analysis to risk factors, as because the uncertainty of project risk factors, there are many risk analysis methods, after comparing the advantages and disadvantages of currently common risk analysis methods of project, this paper...
Based on the review of the relevant researches in the field of investor relationship management, this research analyzed the relationship between investor relationship management and investment satisfaction, developed a theoretical model, and made an empirical test. A sample of 241 investors of listed companies was used to test the model we presented. The result indicates that investor relationship...
The efficient cooperative countermeasure against a large-scale attack is very crucial for current networks. This paper proposed an approach of cooperation based on neighbor distance (ND) for enhancing the performance of the distributed intrusion prevention system (IPS). In the model, message types transmitted between cooperation nodes are defined, and a message-based cooperation method is adopted...
The development of soldier system is customarily based on intuition and experience, however, the costs of this process without simulation is quite high. For this, the soldier simulation system should be established. Based on the multi-body dynamics principle, the definition of dynamic virtual prototype (DVP) of soldier system is presented. The topological structure of soldier system is constructed...
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