Mission planning of rover in lunar exploration environment is the key technology for scientific exploration at specified location. During the moving to destination, rover executes various working-modes including sensi...
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ISBN:
(纸本)9781479946990
Mission planning of rover in lunar exploration environment is the key technology for scientific exploration at specified location. During the moving to destination, rover executes various working-modes including sensing, charging, detecting, sleeping and moving. The execution of each kind of working-mode needs to abide by some interior constraints when rover switches to different working-modes, furthermore, also needs to fulfill some external constraints, such as terrain passing ability, communication window to the earth, visibility to the sun. Under these constrains, a heuristic searching algorithm is used to plan and expand in the state spaces of executable working-modes. In the end, a sequence of working-mode under the condition of least cost is output, and thereby the task requirement of exploration at specified location is satisfied.
Before city emergencies happen,one of the most important tasks is to develop contingency plans,and reasonable analysis of space evacuation vulnerability is an important part of contingency *** on the analysis of evacu...
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Before city emergencies happen,one of the most important tasks is to develop contingency plans,and reasonable analysis of space evacuation vulnerability is an important part of contingency *** on the analysis of evacuation vulnerability of emergency area,this article develops a critical evacuation cluster model,and searches for the critical cluster of evacuation area by heuristicsearching *** the end of the article,it generates the maps of space evacuation vulnerability in city emergency with the technology of GIS, which provide technical support for the making of contingency plans of city emergency.
Fractal image compression is a new technique forencoding image compactly. It builds on local self-similarities within images. It has a character of highcompression-ratio and can zoom in or out at will withoutlosing an...
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ISBN:
(纸本)0780379411
Fractal image compression is a new technique forencoding image compactly. It builds on local self-similarities within images. It has a character of highcompression-ratio and can zoom in or out at will withoutlosing any detail But it has a disadvantage of lengthycompression time unfit for real-rocess and practicalapplication. This paper provides an elementaryintroduction to this compression technique. We surveysome of the advanced concepts such as hybrid methodsand adaptive portioning. Furthermore, we bring aboutheuristic searching algorithm to decrease encoding time.
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