| 1. | Business management information layer bml
商务管理信息层 |
| 2. | Bml business management layer
商务管理层 |
| 3. | The open - boundary cellular automata traffic flow model in accordance with the practice was raised and simulated numerically on the basis of bml model
在bml模型的基础上，提出了符合实际情况的开放边界交通流模型并对其进行了数值模拟分析。 |
| 4. | In this thesis , firstly we introduce the recent studies on traffic flow , which based on the statistical physics , secondly the fundamental principles and characteristics of one - dimension ( 1d ) determined ca model ( dca ) and two - dimension determined ca model ( bml ) are described in detail
本文首先综述了近期来物理学界在统计物理的基础上对交通流的研究发展情况，然后详细介绍了作为各类模型研究基础的一维确定性模型dca和二维确定性模型bml的基本原理和特性。 |
| 5. | In this thesis . firstlv we introduce the recent studies on traffic flow . which based on the statistical phvsics . such as some theoretical approaches study modelstheir instructive significance and limits in practice . the fundamental principles and characteristics of one - dimension ( jd ) determined ca model ( dca ) and two - dimension determined ca model ( bml ) are described in details
本文首先综述了近期来物理学界在统计物理的基础上对交通流问题的研究发展情况：各类研究方法，研究模型及模型对实际应用的意义及其局限性。详细介绍了作为各类模型研究基础的一维决定论模型dca和二维决定论模型bml的基本原理和特性。 |
| 6. | The paper utilizes the standards to describe the nel and bml models for special equipments in power system and fills the blank in this field , then establishes the basis in theory to realize the integrative power system communication network management based on services . hu wei ( electric power communication network ) directed by prof
同时利用标准化建模的方法，构建了电力系统特定设备的网元层和业务层模型，填补了目前此方面工作的不足，为实现以业务为中心的电力系统综合化网络管理系统奠定理论基础。 |
| 7. | Secondllv in the 1 d random traffic flow model . the relation function between the correlation and the creation . disappearance . brake probabilities of the vehicles is presented . according to the statistical mechanical approach to the spatial correlation functions . the theoretical results agree with that of the computer simulation . thirdh . based on the bml model . a main - road traffic flow model with two speeds on two dimensions is designed . this model simulate the traffic situation of one main road and several branches in the cit traffic lights placed on the crossing . vehicles breaking ~ vhile running and turning to other direction while jamming . we investigate the ~ ' e1ocitv and flo ~ ~ of the model when the initial densitvthe brake and turning probabilities . the green to signal rati3 . thc number of the branches and the period of the signal are changed . then the reasons causing all the kinds of phenomena are analvzed . finallv . we simulate the bml model using the method of lattice boltzmann which ~ vas brought out by liu mu - renand obtain the velocity - density graph similar to the previous result . the upper critical densiw above which there are oniv jamming configurations . and the lo ~ ver critical density below which there are only moving configurations are the same as before . the boltzmann function which is on the lattices shows the moving and jaxmning transition obviouslv . thus it proves the possibilit of this method on the traffic research
接着，建立了和研究了二维二速的主干道模型，该模型模拟了城市交通中一条主干道，多条支道的交通情况，在干道与支道的交叉路口设置红绿灯，车辆在运行中可以有对突发事件发生反应的刹车，在发生堵塞时，路口的车辆可考虑通过转向来缓解交通等各种实际情况的发生，给出了车辆演化的演化方程，并通过计算机模拟，研究模型在改变车辆的初始密度、刹车概率、转向概率、支道数、红绿灯信号的绿信比、红绿灯信号周期等各种情况下支、主干道车辆的速度、流量的变化，并分析在各种情况下交通状况的成因，提出改善交通的有效措施。最后，在刘慕仁提出的用格子boltzmann方法研究一维决定论交通流的思路下，将此法推广到对二维bml模型的模拟上，得到了与用以往方法的研究结果相类似的速度-密度图线，且车辆从运动相到堵塞相转变的上下临界密度是一致的，同时分别给出车辆在处于畅通相和堵塞相时， boltzmann函数在格子上的分布情况，进一步验证了此法的可行性。 |
