基于遗传算法的用户线缆智能选路系统

将遗传算法的思想与原理应用到大型通信网络路由选择算法中来，使得路由选择功能随着网络动态的变化而不断自我进化与完善。其根本目的是通过准确率极高的预见性来提高路由选择性能。这种改进后的新型选路机制将会在很大程度上改善复杂通信网络中选路系统的性能与效率。     

遗传算法的定式及其收敛性研究

从算法论与数理逻辑的角度给出了新的遗传算法定式,其中包括生物遗传并法的定式与通俗遗传算法的定式,在此基础上进一步讨论了遗传算法的收敛性,提出了遗传算法收敛性公理。     

新型组合模型在铁路客运量预测中的应用

客运量是用来测算交通运输业所承担的工作量,反映了运输业为国民经济和人民生活服务的数量指标,准确的客运量预测直接影响到铁路项目的经济效益评价及铁路交通组织安排。根据客流量数据的特点,提出新的组合预测方法,构建线性时间序列灰色GM(1,1)模型和考虑客流量影响因素的非线性遗传算法优化BP神经网络模型。最后结合新建兰州至中川机场铁路项目及调查数据进行客流量的预测研究,并将组合模型预测结果和单一模型相比,得出新型线性和非线性组合模型预测精度更高,取得了满意的效果,为客流量的预测提供了一种新的工具。     

改进有序组合树法在铁路普通零担货物拼箱配装中的应用

为优化铁路普通零担货物拼箱配装方案,以集装箱标记载重最大化为目标,建立0—1整数规划模型,利用改进的有序组合树算法对模型进行求解,得出最优拼箱配装方案。通过拼箱配装实例的计算,说明该算法解决零担拼箱配装问题具有一定的有效性和优越性。     

基于混合算法的机车二系弹簧载荷调整优化方法

针对电力机车二系悬挂调簧分析数学模型算法的优化问题,提出一种遗传算法(GA)与蚂蚁算法(AA)相结合的混合优化算法。其基本思想是:首先采用遗传算法以较少的进化代数进行全局快速随机搜索,获得若干可能的(近似)优化解,以此生成蚂蚁算法初始信息素分布,再用后者求得全局优化精确解。对国产SS3B和SS9型机车的应用结果表明,对同一车体进行多次优化计算试验,混合优化算法的搜索寻优过程均能稳健一致地收敛到全局优化解,可明显缩短二系支承载荷调整调簧计算所需时间,使调簧试验的实时性大为提高。对于二系为高圆簧的SS9型机车,混合算法平均用时比迭代算法和单一遗传算法分别减少约74%和29%。     

基于遗传算法的内河船舶避碰路径优化研究

提出一种遗传算法用于解决内河狭窄弯曲航道中的船舶避碰问题。运用算法的空间寻优能力,设计简单的编码,根据航道及障碍物等约束条件,按照一定的优化准则设计出相应的适应度函数。通过计算机仿真表明,该方法具有良好的避碰路径寻优能力,为最终实现自动避碰奠定基础。     

基于区位理论的物流配送中心车辆调度优化算法

针对物流配送中心的车辆调度,建立了车辆分配和路径优化的数学模型,并对配送分区的实现采用四叉树法;对运输巡回线路的实现采用蚁群算法求解。通过算例,给出了基于区位理论的物流配送中心车辆分配和路径优化的具体方案。     

Application of a genetic algorithm to the optimal structural design of a ship's engine room taking dynamic constraints into consideration

The genetic algorithm, known as GA, is used to optimize engine room structure, not only under static constraints, but also under dynamic constraints. A penalty function method is used to handle the complicated constraint conditions based on the numerical results of dynamic and static analyses. There are several ways to take the dynamic effect into account in the optimum design of ship structure. First, the inequality constraint condition is applied to separate the natural frequency and the exciting frequency. Second, generalized design variables are introduced in order to transfer not only the dynamic but also the static equilibrium equations into the equality constraints, resulting in the optimal structural design without the need to solve these equilibrium equations. Third, the magnitudes of the acceleration and displacement are constrained instead of applying the natural frequency constraint condition. In order to achieve better convergency in the optimization with least resources, several operators and methods are considered and then introduced into the structural design of the engine room. The new operator, called either objective elitism or fitness elitism, is introduced to improve the efficiency of the method. The effect of boundary mutation and nonuniform mutation on the performance of the GA is examined. Not only binary representation but also floating-point representation are used to express the design gene in the GA. Fuzzy theory is applied in the GA to handle the uncertainty of the constraint conditions. Two ways of solving fuzzy optimization are investigated in order to obtain a fuzzy solution and a crisp solution. Received: October 2, 2000 / Accepted: November 30, 2000     

一种用于无线列调信令软件解码的算法

介绍了一种对无线列调信令解码的独特算法。通过分析传统的信号处理方法,找到了一种简便、快速而又实用的方法,取名"三点法",并用数字信号处理器DSP加以实现,在实际应用中得到很好验证。     

The Japanese experience with mini‐cars

Despite the early appeal of the light vehicle, increases in the average annual income have allowed consumers to consider a broader range of vehicles so that the negative aspects of mini‐vehicles such as higher noise and vibration levels, the lack of horsepower and instability in certain driving conditions have made light vehicles less tolerable. The “oil shock” shattered economic projections, and people began to acknowledge that living in a world with limited resources was a harsh reality. Concurrently, congestion increased dramatically in urban areas as a result of the popularity of automobiles, and producers made a number of design changes to improve the safety and comfort limitations of light vehicles. Thus, in a world where fuel economy and ease of use gained a greater meaning, light vehicles slowly regained their original appeal.

Light vehicles may play a greater role in the future. Studies indicate that light vehicles tend to be driven by females and elderly people and current trends indicate that the number of female drivers is increasing and that the average age of the Japanese population is getting higher. Furthermore, migration patterns indicate that a greater number of people are moving to smaller cities and their outlying areas as a result of national decentralization policies. The migration pattern may popularize light vehicles because vehicle ownership rates are higher in these areas than in larger cities. Another development which may increase the popularity of light vehicles is that more families are owning more than one car and light vehicles are popular as second vehicles. Moreover, the prospects of low economic growth have tempered the importance of comfortable amenities, and the virtues of maneuverability and fuel economy have become more important.