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Due to different class systems make access decision independently, in the cross class information system (Cross-Class-IS), the privilege may be out of control and the security policies may not be coincident. It is huge risk especially to the higher class system. Now, the system normally checks the security of the access between subject and object. But it cannot protect the indirect information caused...
Soil contamination is an enormous problem in China and severely threatens environmental quality and food safety. Desorption of contaminants from soil is a critical process controlling the availability of soil contaminants and thus the risk associated with contaminated soil. All the currently adopted desorption models greatly simplify desorption by assuming that desorption is a simple reverse of adsorption...
With the development of the electricity market and the attention paid to energy problem, the mode by which power grid combines with distributed generation is in good graces. In this paper the performance after the connection of fuel cell generation system with traditional substation is simulated and analyzed. On the basis of power generation principle of fuel cell and its detailed mathematical model,...
This paper analyzed the energy consumption characteristics of typical limestone-gypsum wet flue gas desulfurization (FGD) system which is widely used in power plant for SOx removal, and discussed its optimal operation. In the FGD system, booster fan; circulating slurry pump and oxidation fan are three major energy consuming devices. We established the mathematical models to disclose the relationship...
In general, the rolling mill uses PID method to control the plate thickness. Performance of the PID controller relies on the plant model, however it is difficult to establish the precise model of hydraulic servo system due to its uncertainties. Fuzzy control does not need the precise model, so a fuzzy PID controller is designed. In this paper, a mathematical model of the rolling mill in ideal circumstance...
The strategy of sustainable development is paid more attention by the people in the world. It is urgently to solve such problems by an appropriate method. This article applies ecological footprint to account and analyze the sustainable development of China's Heilongjiang province from 1995 to 2006. The following results were obtained. The arable land contributed most to the ecological footprint among...
In this paper a multivariable generalized predictive adaptive control(MGPC) scheme is presented under the multi step cost-function with the polynomial matrix weighting. A simplified MGPC adaptive algorithm and a comparison between the simplified algorithm and original one in the amount of calculation are also given.
This paper describes a new multivariable generalized self-tuning controller which combines the classical control strategy of pole assignment with the optimal strategy of self-tuning control. The proposed controller adopts the techniques of updating weighting polynomial matrices of the cost function on line and eliminating the tracking errors without using an integrator and realizes the decoupling...
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