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The supercritical unit boiler systems of a certain power plant, with the properties of time-varying, large delay, large inertia, etc., shows the characteristics of long stable time and great fluctuation in main parameter like the main steam pressure when the AGC (Auto Generation Control) is used and the load changed frequently. To solve the above problem that the controlled parameter is unstable,...
Spam fighting is a classic puzzle in network security. In the past decades, many filtering spam solutions have been proposed. However, currently the conventional techniques still suffer from high false positives and false negatives, especially the former which usually cannot be accepted by the end users. This paper proposes a novel online URL-based spam filter (UBSF) on the basis of analyses over...
For protection of the confidentiality and integrity of the mobile codes, this paper proposes a new decentralized label model and a implementation of this model in Linux system, MCGuard. Using MCGuard, the owners can flexibly define their security policies to control the dissemination of their mobile codes just by labelling them. By intercepting system calls, MCGuard inserts an interposition layer...
The concept of state transition graph is used to analyze the cascading failure of electrical power grids in different load level. State transition graph is introduced first, then the state transition model of electrical power system DC flow is designed. The IEEE 9-bus sample system is used to show the state transition graph evolution by aggravating the load level. Some general conclusion is drawn...
When a power system load parameter is over a certain value, the system will experience a saddle-node bifurcation, and voltage collapse occurs. The difficulty in getting the voltage collapse point is that the system Jacobian matrix has a simple zero eigenvalue at the critical point, causing the Newton method failure in the neighborhood of the bifurcation point. Based on the circuit models of a power...
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