From the perspective of promoting the competitive ability and creating a appropriate competitive environment , this paper discussed the principles , technical courses and development strategies for improving agricultural international competitiveness and for the development of agricultural mechanization in the new era 从提高竞争能力和创造良好的竞争环境两个方面对提高我国农业国际竞争力和新阶段发展农业机械化的指导思想、技术路线选择和发展策略进行了深入分析。
Realizes the longitudinal relationship between models by using object - oriented programming language ; 2 ) sets forth the function and software design in detail , and analyzes entities of the system . realizes the randomness of traffic flow and constructs vehicle arriving model , vehicle movement model on road segments and vehicle movement model on intersections , so completes the kernel part of traffic simulation ; 3 ) uses 3d modeling software - multigen creator and real - time simulation software - vega to build up the 3d virtual environment of microscopic traffic simulation , and drives dynamic entities such as driver - vehicle units and traffic lights in static scenes ; 4 ) studies the characteristic of checkerboard system of street layout , analyzes and decomposes the system to deduce a certain simplification method . and researches the application of urban traffic route choice 论文主要工作如下： 1 )利用面向对象技术分析交通仿真系统模型之间的横向关系和交互作用，研究静态实体的状态变化和动态实体的运动规律；利用面向对象的程序设计语言实现系统中模型的纵向关系； 2 )详细阐述交通微观仿真系统的功能设计、软件设计，分析仿真系统中的实体；实现车流的随机性，建立车辆的到达、车辆在路段上的行驶过程、车辆通过交叉口的行驶过程等模型，完成交通仿真的核心内容； 3 )利用三维建模软件multigencreator和实时仿真软件vega建立交通状态微观仿真的三维虚拟环境，在静态视景中驱动驾驶员-车辆单元、信号灯等动态实体； 4 )研究棋盘式道路格局的特点，从理论上分析并分解系统，得到一定的简化依据，进一步研究城市交通路线选择的应用。
Abstract : this paper sets up a logarithm multi - routes choice model of transport passage system predicating on the maximum of system utility and puts up the demarcating method of its parameter and its numerical solution . then it gives an example . this model can forecast the ration of traffic distribution on each route in a network . it can also be used to analyse influence of service attribution on road users ? choice of routes 文摘:笔者在系统效用最大化前提下，建立了交通运输通道系统多项式分对数多路线选择模型，提出了模型中参数的标定方法和模型的数值解法，并结合实例对模型进行了标定.利用所建立的模型可预测路网交通量在多条路线上的分配比率，并可利用弹性定义分析不同服务属性对出行者选择路线的影响
It studied lots of examples overseas of logistics delivery and algorithms , analyzed many factors that affect the efficiency of delivery , and investigates the models of delivery that are popular adopted . based on it the two new reference algorithms are proposed in this thesis . one algorithm is for selecting locations of dedicated logistics distribution center , and the other is for selecting optimal routines of transportation 本文在学习了大量电子商务理论及物流配送理论的基础上，研究了大量的国内外的物流配送实例及物流配送算法，对各种影响物流配送效率的因素、目前广泛采用的物流配送方式等进行了分析，给出了一种适合于我国电子商务现状的物流配送参考模式，提出了基于internet环境的电子商务物流配送系统参考模型，设计了适合于实际的配送中心选址模型、算法和运输路线选择模型及算法。
