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It is a big challenge to establish a dynamic access control model to secure applications in open and dynamic environment. The dynamic feature of an access control system is sometimes related with that of applications of open environment. This paper analyzes first the reason that causes the dynamic change of access control systems and then proposes a five-level access control architecture which describes...
This paper has studied the flow of emergency plan for coal mine on the basis of Petri nets technology. Depending on the analysis of coal mine emergency response process, the theoretical framework of emergency plan has been established as well as the emergency business process of real world. Then, by using of Petri nets modeling technology, workflow modeling of coal mine emergency plan is established,...
Analytical modeling plays a crucial role in the analysis and design of computer systems. In order to improve the efficiency of coal mine emergency rescue systems and correlate the coal mine emergency plan with emergency rescue closely, it's necessary to deeply analyze the process of emergency rescue and systematic modeling. As Stochastic Petri Net represents a powerful paradigm, widely used for such...
Nowadays many corporations have used advertisement decision support system, which can be used to help people make scientific, reasonable advertisement planning and marketing work. Direct mail (DM) is a popular advertisement means, however there lacks DM advertisement fee model in those advertisement decision support system. Thus it is necessary for bookshop to build a DM advertisement fee model that...
The complementary characteristics of cellular networks and wireless local area networks (WLANs) make it attractive to integrate these two technologies. In this integrated heterogeneous environment, mobile stream control transmission protocol (MSCTP) is ideal to support vertical handover (VHO) between them by enabling a mobile client to freely switch between IP addresses acquired in different networks...
The characteristics of three GTO structures with conventional, short and transparent anode, that is, GTO, SAGTO and TAGTO, are analyzed by using MEDICI simulator. The characteristics of TAGTO are illustrated by comparing with GTO and SAGTO. The results show that the transparent anode with an additional n-layer buffer used in TAGTO devices can further improve its blocking and switching characteristics...
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