Rock-masses are divided into many closed blocks by deterministic and stochastic discontinuities and engineering interfaces in complex rock-mass engineering. Determining the sizes, shapes, and adjacent relations of blo...Rock-masses are divided into many closed blocks by deterministic and stochastic discontinuities and engineering interfaces in complex rock-mass engineering. Determining the sizes, shapes, and adjacent relations of blocks is important for stability analysis of fractured rock masses. Here we propose an algorithm for identifying spatial blocks based on a hierarchical 3D Rock-mass Structure Model (RSM). First, a model is built composed of deterministic discontinuities, engineering interfaces, and the earth's surface, and the deterministic blocks surrounded by these interfaces are traced. Then, in each deter-ministic block, a network model of stochastic discontinuities is built and the stochastic blocks are traced. Building a unitary wire frame that connects all interfaces seamlessly is the key for our algorithm to identify the above two kinds of blocks. Using this algorithm, geometric models can be built for block theory, discrete element method, and discontinuous deformation analysis.展开更多
论文依据工程控制论中的系统辨识理论,就宏观经济系统建模的几个重要方面:先验知识、建模假设、建模数据、机理的恒定性、可辨识性、因果性等进行审视和评论;对宏观经济学术界,有关经济模型的两个有争议的问题、两个责难和卢卡斯批判提...论文依据工程控制论中的系统辨识理论,就宏观经济系统建模的几个重要方面:先验知识、建模假设、建模数据、机理的恒定性、可辨识性、因果性等进行审视和评论;对宏观经济学术界,有关经济模型的两个有争议的问题、两个责难和卢卡斯批判提出了看法.鉴于审视的结果,论文对现用模型经修补后能否预测危机持悲观态度.为此,简介了欧盟经济的巨型并联基于主体的经济模型EU/RACE(agent-based computational model of European economy)及其创新之处.最后为能预测经济危机,论文总结了建模的研究趋势,包括动态随机一般均衡(dynamic stochastic general equilibrium,DSGE)模型和基于主体的可计算(agent-based computational,ACE)模型的结合、需要对宏观经济学进行反思,以及加强对变结构系统辨识的研究等等.展开更多
基金Supported by National Natural Science Foundation of China (Grant Nos. 40602037 and 40872183)
文摘Rock-masses are divided into many closed blocks by deterministic and stochastic discontinuities and engineering interfaces in complex rock-mass engineering. Determining the sizes, shapes, and adjacent relations of blocks is important for stability analysis of fractured rock masses. Here we propose an algorithm for identifying spatial blocks based on a hierarchical 3D Rock-mass Structure Model (RSM). First, a model is built composed of deterministic discontinuities, engineering interfaces, and the earth's surface, and the deterministic blocks surrounded by these interfaces are traced. Then, in each deter-ministic block, a network model of stochastic discontinuities is built and the stochastic blocks are traced. Building a unitary wire frame that connects all interfaces seamlessly is the key for our algorithm to identify the above two kinds of blocks. Using this algorithm, geometric models can be built for block theory, discrete element method, and discontinuous deformation analysis.
文摘论文依据工程控制论中的系统辨识理论,就宏观经济系统建模的几个重要方面:先验知识、建模假设、建模数据、机理的恒定性、可辨识性、因果性等进行审视和评论;对宏观经济学术界,有关经济模型的两个有争议的问题、两个责难和卢卡斯批判提出了看法.鉴于审视的结果,论文对现用模型经修补后能否预测危机持悲观态度.为此,简介了欧盟经济的巨型并联基于主体的经济模型EU/RACE(agent-based computational model of European economy)及其创新之处.最后为能预测经济危机,论文总结了建模的研究趋势,包括动态随机一般均衡(dynamic stochastic general equilibrium,DSGE)模型和基于主体的可计算(agent-based computational,ACE)模型的结合、需要对宏观经济学进行反思,以及加强对变结构系统辨识的研究等等.
