Current MEMS design methods do not fulfill the needs of emerging complex MEMS devices. In this paper, a systematic direct solid modeling approach for surface micromachined MEMS design is proposed. In this approach, practical model of a surface micromachined MEMS device, designed in a traditional CAD environment, is simplified firstly; after simplification, masks and process sequences are generated through solid-based mask synthesis; then local variation is used to refining the 3D layer model; finally masks and process sequences are verified in rough simulation and accurate simulation. The approach aims at enabling designers to focus on creative design activity in an intuitive mode.
Due to the rising tendency of chemical accidents, it is urgent to develop a real-time gas diffusion simulation system on computer during the emergent chemical accidents, and high computation efficiency of gas diffusion model is indispensable in the simulation system. This paper develops an efficient diffusion model based on Gaussian Puff Model and proposes a special numerical simulation method for the model. With the proposed model and the proposed method, the spatial density distribution of the gas spread can be computed rapidly and displayed visually in GIS. To validate the correctness, efficiency, reliability and flexibility of the model, two groups of simulations in different aspects (space and time) are performed respectively. The result of simulation is as well as expected, and the system based on the model will provide a reliable guarantee for rescue during emergent chemical accidents.
T Vehicle scheduling for personnel evacuation plays a significant role in disaster rescue. However, current vehicle scheduling methods do not meet the needs of emergency response in disaster rescue. This paper proposes a rapid vehicle scheduling method to evacuate the crowd and reduce losses in an emergent situation. We construct a specific model for vehicle scheduling problem in disaster rescue firstly, and then put forward a heuristic algorithm to solve this problem. An empirical example is used to evaluate the effectiveness of the method. Scheduling and evacuation data are computed in real-time and considerations about dangerous zones of different dangerous levels are also included in this method. The characteristics of the method make it more suitable in actual emergency rescue.
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