Large-scale natural or man-made disasters have the potential to cause great loss of life, human injury and extreme property damage. Evacuation from areas at risk is often one of the most feasible strategies that ...
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ISBN:
(纸本)9781424472796
Large-scale natural or man-made disasters have the potential to cause great loss of life, human injury and extreme property damage. Evacuation from areas at risk is often one of the most feasible strategies that can be undertaken in response to these types of disasters. Evacuating a large population in the shortest possible time is an extremely complicated and difficult task, which urgently needs to look for ways to control the evacuation traffic flow efficiently and effectively in real-time. This paper, on the foundation of adaptive control theory, puts forward a traffic adaptive control framework for real time large scale emergency evacuation, the characteristic of which integrates a method of prescriptive reference model and the adaptive control system. The prescriptive reference model is applied to specify, in a short-term and rollinghorizon manner, the desired traffic states, which serves as a reference point for the adaptive control. And the adaptive control system combines these desired states and the current prevailing traffic conditions collected by the sensing system to produce real time traffic control schemes. These traffic control schemes are implemented in the field to guide the real world traffic flow to evolve towards the desired states.
Large-scale natural or man-made disasters have the potential to cause great loss of life, human injury and extreme property damage. Evacuation from areas at risk is often one of the most feasible strategies that can b...
详细信息
Large-scale natural or man-made disasters have the potential to cause great loss of life, human injury and extreme property damage. Evacuation from areas at risk is often one of the most feasible strategies that can be undertaken in response to these types of disasters. Evacuating a large population in the shortest possible time is an extremely complicated and difficult task, which primarily relies on real-time efficient traffic control method for emergency evacuation. This paper, on the foundation of simulated human intelligent control, puts forward a framework of real-time traffic control for emergency evacuation, the characteristic of which integrates a method of feature information acquisition and processing, characteristic pattern set, pattern recognition and control rule set. The work of this paper attempts to optimize the real-time traffic control method in terms of both quality and feasibility.
In this paper, based on remote sensing data of 1999a and 2007a of the Xiangxi River watershed(XRW) and field investigation, changes of soil erosion and spatial distribution in the XRW has been studied through the GIS ...
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In this paper, based on remote sensing data of 1999a and 2007a of the Xiangxi River watershed(XRW) and field investigation, changes of soil erosion and spatial distribution in the XRW has been studied through the GIS spatial overlay analysis of vegetation coverage、terrain slope and land use. The result indicated that the soil erosion area of the XRW reduced from 1999a to 2007a, the areas above moderate soil erosion decreased from 623.01 km2 to 334.19km2，occupied 20.73％ and 11.12％ of the total study area respectively. For spatial distribution, the slight soil erosion distributed extensively. The more serious region mainly distributed in two banks of the river with the proportion of the areas above moderate erosion reached to 46.03％ and 25.45％. It should be gained more attention in the future.
In this paper,the proposed is a quasi-flow constitutive model with strain-rate sen- sitivity for elastic plastic large *** model is based on the Quasi-flow Corner theory, and is suitable for the sheet metal forming pr...
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In this paper,the proposed is a quasi-flow constitutive model with strain-rate sen- sitivity for elastic plastic large *** model is based on the Quasi-flow Corner theory, and is suitable for the sheet metal forming process simulation with a variable punch machine velocity. Uniaxial tensile tests and deep-drawing tests of a circular blank with square punch are carried out and numerically *** consistency between the experimental and the numerically simulated results shows the validity of the present new constitutive model.
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