The thesis includes three parts : firstly , previous study and latest advance of molecular motor in biology are outlined , including myosin ' s and kinesin ' s construction and function , the latest advance of molecular motor in constructional biology ; secondly , the latest advance of molecular motor in physics is reviewed , including the general view of brownian motor and two examples of molecular motor , one being related to two kinds of flashing potention energy , the other being related to electronical bipole ; and finally , the model on unidirectional motion of molecular motor is in detail come up with , and especially , the interact ion between two heads is taken into account , followed by the construction of langevin equation and fokker - planck equation involved in the model . by using solutions of fokker - planck equation , unidirectional motion mechanism of molecular motor is analyzed 本文内容包括：首先综述生物学领域分子马达研究的最新进展，内容安排为：肌球蛋白的结构和功能，驱动蛋白的结构和功能，肌球蛋白和驱动蛋白定向运动机制的结构生物学方面的最新进展；其次综述并分析了当前研究分子马达定向运动机制的几种物理模型，内容安排为：分子马达运动的基本观点和建构模型的一般方法，势垒的两态涨落诱导的分子马达运动模型，分子马达定向运动的偶极子模型；最后讨论双头相互作用的分子马达模型，内容安排为：先详细论述模型的构建，再建立langevin方程和fokker - planck方程，接着用差分的方法求解出fokker - planck方程的解，然后分析和研究分子马达定向运动的机制。
Chapter 5 performs a simulative evaluation of mobile ip via ns - 2 for a scenario comprising of one home agent and two foreign agents based on ieee 802 . 11 wireless lan standard . we describe a model which is adaptive to directional motion such as high speed vehicle . we represent the bandwidth and loss packet under constant bit rate ( cbr ) traffic 本模型的主要特点是考虑了定向运动下诸如列车上的专用网络，移动节点在进行大流量通信下切换时的带宽和丢包数的性能评估，并分析了丢包数和网络时延/移动速度之间的关系，获得了相应的结论。
We respectively calculated the directional movement of kinesin under white noise and colored noise and the results are as follows : the coupled effect result in a directional particle current , and the current velocity is selective to the angular velocity 0 ) and noise intensity d , which reflect the effects of the rate of atp ' s hydrolysis and the temperature of cell on the movement of molecular motors 建立起更贴近生物实际的双构象耦合模型，并分别计算了白噪声和色噪声作用下马达的定向运动。结果表明：这种耦合作用产生了沿微管正向的粒子流，其速度对角速度和噪声强度d均有选择性，反映了atp水解速度和细胞温度对马达运动的影响。
In the fourth chapter , by using the theory of regional potential energy , aiming at the regional layout of international direct investment in china , the author made an analysis on the cause resulting in the nonequilibrium layout of foreign investment and the effects on the changes of regional economic structure caused by the regional layout of foreign investment and forecasted the tendency for importing foreign investment of the provinces , municipalities directly under the central government and autonomous regions . in the conclusion , according to the theory of regional potential energy , the author set forth the law of motion of international direct investment . regional potential energy is determined by the nature , combined mode and development of the elements in the region 结论部分在总结正文的基础上，根据区域势能理论，归纳出国际直接投资的运动规律：区域内备项要素的性质、组合与发展变化决定了区域势能的大小；而各区域的势能差异，必然对资本的区域间流动产生强烈的影响，并决定其定向运动的规律；作为经济发展的关键性要素，外资进入后，又将通过区域势能的激活效应重塑区域社会经济现实，从总量与结构等各个方面改变区域的发展水平和发展方向，并最终决定新一轮区域势能的形成及其性质和特点。
Based on the actual biology settling , kinesin moves along microtubule which is constructed from asymmetrical o and p protein subunits which array periodically , so the microtubule ' s structure is also asymmetrical and periodical . during the motion , kinesin ' s configuration changes in a dynamic - chemical period in which there are several dynamic - chemical states for the motor , and the transitions are random between state and state to a certain extent 根据实际的生物背景，驱动蛋白沿微管作定向运动，构成这些微管的蛋白亚基顺序排列，形成非对称的周期性结构，且驱动蛋白在运动过程中构象发生了变化，在一个力学和化学循环中要经历多个中间态，各个态之间的跃迁具有随机性。
