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Spectrum sensing is one of the most important technologies for cognitive radio. In order to decrease the effect of low SNR, and increase the reliability spectrum sensing performance, we propose a novel spectrum sensing approach, which collects the distributed collaborative beamforming signals as the test statistic to input the energy detector. In particular, the collaborative beamforming method can...
In order to implement flow management of process planning and meet the process information requirements in manufacturing enterprises, workflow technology was introduced to analyze the activities of process planning. It was extremely important for workflow modeling of process planning. Based on the flow analysis of process planning, the modeling generalized stochastic Petri nets (GSPN)-based was proposed...
Aimed at security issues in collaborative process planning system, a multi-level and dynamic access control (PPMLDAC) model was proposed for collaborative process planning based on role based access control (RBAC) model. A multi-level permission model was discussed on the basis of product and task decomposition level structure. New concepts of permission and permission assignment were defined for...
Collaborative design is new design style to meet the increasing requirement of global market, which share various resources and information of different designers with the aim of reaching the purpose. Designers complete the same task in different places. Designers work at the same time will encounter the conflict, which is a critical problem for collaborative design. Firstly, the class of conflict...
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