基于Ahn改进遗传算法的路由优化算法的研究

论述了用Ahn改进遗传算法解决路由路径的优化问题,采用可变长度染色体路由串和它的基因节点应用于编码问题,交叉操作在交叉点进行部分染色体部分路由交换,变异操作维持种群的多样性。该算法采用简单维护操作,维护好所有的不可行的染色体。交叉操作和变异操作相结合保证了最优解的搜索能力和解的全局收敛性。计算机仿真实验表明该算法快速有效、可靠性高。     

基于遗传算法的最短路径路由优化算法

论述了用启发式遗传算法解决最短路径路由的优化问题.采用可变长度染色体(路由串)和它的基因(节点)应用于编码问题.交叉操作在交叉点进行部分染色体(部分路由)交换,变异操作维持种群的多样性.该算法采用简单维护操作维护好所有的不可行的染色体.交叉操作和变异操作相结合保证了最优解的搜索能力和解的全局收敛性.计算机仿真实验证明该算法快速有效,可靠性高。     

基于遗传算法的最短路径路由优化算法

论述了用启发式遗传算法解决最短路径路由的优化问题,采用可变长度染色体(路由串)和它的基因(节点)应用于编码问题,交叉操作在交叉点进行部分染色体(部分路由)交换,变异操作维持种群的多样性.该算法采用简单维护操作维护好所有的不可行的染色体.交叉操作和变异操作相结合保证了最优解的搜索能力和解的全局收敛性.计算机仿真实验表明该算法快速有效、可靠性高.     

基于遗传算法的最短路径路由优化算法

论述了用启发式遗传算法解决最短路径路由的优化问题.采用可变长度染色体(路由串)和它的基因(节点)应用于编码问题.交叉操作在交叉点进行部分染色体(部分路由)交换,变异操作维持种群的多样性.该算法采用简单维护操作维护好所有的不可行的染色体.交叉操作和变异操作相结合保证了最优解的搜索能力和解的全局收敛性.计算机仿真实验证明该算法快速有效,可靠性高.     

求解必经点k条最优路径问题的粒子群优化算法

提出了一种解决指定必经点[k]条最优路径问题的粒子群优化算法。算法以[k]条最优路径集合作为优化目标,将粒子种群划分为[k]个子种群,通过各子种群的局部搜索和子种群间的相互协作,使种群在搜索过程中易于找到[k]条最优路径。为了提高含有多必经节点的初始生成路径的多样性,设计了基于弹性拉伸原理的种群初始化方法。在随机生成的26个节点65条边,50个节点262条边和80个节点410条边的拓扑图中,分别选取不同的源节点和目的节点,以及必经节点对算法进行了测试。数值实验结果表明,提出的算法在求解网络规模比较大、必经点数比较多的无环[k]条最优路径问题中具有比较好的性能。     

基于梯度统计变异量子遗传算法的车辆路径规划

针对传统路径规划算法收敛速度慢、稳定性差、易陷入局部极值的问题, 提出一种基于梯度统计变异量子遗传算法的车辆路径规划方法. 首先在依据染色体适应度值动态调整旋转角步长的基础上, 引入梯度下降思想对量子旋转门调整策略进行改进; 根据染色体变化趋势的统计特性, 设计基于梯度统计的变异算子实现变异操作, 提出基于量子位概率密度的自适应变异策略; 以路径最短为指标建立车辆路径规划模型, 通过仿真实验验证改进算法在车辆路径规划中的有效性, 与其他优化算法相比, 本文改进算法所规划路径长度更短, 搜索稳定性更好, 能有效控制算法陷入局部最优.     

基于节点扩张的遗传算法在机器人路径规划中的应用

将一种新型的遗传算法应用于移动机器人路径规划。提出基于障碍节点扩张法的无障碍连通路径初始种群的产生算法,以及基于待变异节点扩张的变异操作算法,同时在交叉、变异操作之后进行局部优化,简化编程,提高适用性。仿真结果表明同普通的A*算法相比较,该路径规划算法具有寻优质量高、规划路径更为平滑的特点     

求解CVRP问题的混合遗传微粒群算法

采用借鉴遗传算法的编码、交叉和变异操作的遗传微粒群算法对带车辆能力约束的车辆路径优化问题进行求解。设计了符合微粒群算法进化机制的变异算子和改进顺序交叉算子以满足遗传微粒群算法中三条染色体交叉与变异的需要。对多个基准测试实例仿真计算表明算法有效且具有收敛速度快和精度高的优点。     

度约束单源多目的路径问题的遗传算法

提出了一种求解度约束单源多目的路径寻优问题的遗传算法,算法采用节点路径形式的编码表示一棵生成树,并设计了相应的实现树形结构的交叉和变异算子,以及节点度的改变算法.本算法实现了具有树形结构染色体的遗传进化,数值实验表明了算法的有效性.该算法可以应用于大规模网络中求解目的节点比较多的路径寻优问题.     

基于改进基因算法的海洋平台巡检机器人路径规划

传统遗传算法最优路径搜索效率相对较低,容易产生无实际意义个体。为此,在遗传算法选择操作中引入邻域搜索算法,提高算法的局部搜索能力,调整可变长度染色体邻接点交叉算子进化操作,避免生成间断路径。同时,在变异操作中引入多样性约束与改进的A*算法,提高遗传算法前期搜索效率。最后,在适应度函数中考虑路径长度、安全性和移动代价,生成的路径远离障碍物并在一定程度上降低转弯次数。实验证明,改进后的遗传算法在多障碍物环境下的路径规划过程中提高了搜索效率,更有利于找到实际应用中的最优解。     

Automatic generation of basis test paths using variable length genetic algorithm

Path testing is the strongest coverage criterion in white box testing. Finding target paths is a key challenge in path testing. Genetic algorithms have been successfully used in many software testing activities such as generating test data, selecting test cases and test cases prioritization. In this paper, we introduce a new genetic algorithm for generating test paths. In this algorithm the length of the chromosome varies from iteration to another according to the change in the length of the path. Based on the proposed algorithm, we present a new technique for automatically generating a set of basis test paths which can be used as testing paths in any path testing method. The proposed technique uses a method to verify the independency of the generated paths to be included in the basis set of paths. In addition, this technique employs a method for checking the feasibility of the generated paths. We introduce new definitions for the key concepts of genetic algorithm such as chromosome representation, crossover, mutation, and fitness function to be compatible with path generation. In addition, we present a case study to show the efficiency of our technique. We conducted a set of experiments to evaluate the effectiveness of the proposed path generation technique. The results showed that the proposed technique causes substantial reduction in path generation effort, and that the proposed GA algorithm is effective in test path generation.     

Dynamic path planning of mobile robots with improved genetic algorithm

In this study, a new mutation operator is proposed for the genetic algorithm (GA) and applied to the path planning problem of mobile robots in dynamic environments. Path planning for a mobile robot finds a feasible path from a starting node to a target node in an environment with obstacles. GA has been widely used to generate an optimal path by taking advantage of its strong optimization ability. While conventional random mutation operator in simple GA or some other improved mutation operators can cause infeasible paths, the proposed mutation operator does not and avoids premature convergence. In order to demonstrate the success of the proposed method, it is applied to two different dynamic environments and compared with previous improved GA studies in the literature. A GA with the proposed mutation operator finds the optimal path far too many times and converges more rapidly than the other methods do.     

面轨道特征的矩形排样与加工路径优化方法研究

为了解决实际生产中遇到的一种带有面轨道特征的矩形排样问题,重点研究了自 适应遗传算法和图论相结合的优化方法,极大提高了切削加工效率。该方法将路径优化问题转 化为一个考察无向图连通性问题,并利用遗传算法在解空间中进行全局搜索,以寻找加工路径 最优解,并按照BL 定位策略完成对矩形的排样。通过对遗传算法的改进：①对初始个体基因 位的合法性判断,并利用深度优先遍历结果评估个体性能的优劣;②交叉、变异算子均采用自 适应机制,并且执行变异操作的对象限定为一条染色体上的断点集,极大提高了算法的性能。 最后,通过实验验证了该算法在绝大多数情况下完全可以找到满足需求目标的结果,是一种非 常可靠的方法。     

能力风暴机器人的全局路径规划

基于Messy遗传算法(Messy GA),设计了移动机器人的通用路径规划算法,其中的优化目标包括最短路径、一定的平滑度和最优安全距离.在算法中加入了优化算子及交叉率和变异率的自适应调整,加快了收敛速度.仿真结果验证了所提方法的有效性.根据能力风暴机器人(AS-R)的实际运行要求,修改算法以扩大路径与障碍物之间的间隔度,并提出采用平滑的方法来优化路径.以AS-R为平台进行了轨迹跟踪实验.实验结果表明算法在随机摆放障碍物和实验室环境下可以实现路径规划,并能够最终实现AS-R机器人的全局路径规划.     

基于混合遗传算法的有效路径求解

有效路径集的计算对交通分配有较大的影响，根据用户选择路径的特点以及交通限制的情况，重新定义了有效路径；并设计了基于顶点出度的混合遗传算法求解有效路径集合。算法采用正整数编码方法，编码产生时考虑了其生成概率，并采用了自适应调节算法来控制交叉、变异概率和模拟退火算法进行选择以保持群体的多样性及收敛性；算法不需要对染色体进行修补，弥补了基于优先权遗传算法计算路径时的不足。算法在解码过程中考虑了交叉口延误及交通限制情况，并利用算法的寻优迭代过程来产生有效路径的集合，采用同时解码的方式，同时对多对OD间计算有效路径，提高了计算多点对之间有效路径的效率。最后的计算实例分析表明该算法的有效性。     

受限空间自适应区域栅格化的优化路径规划

针对障碍物分布复杂、存在封闭边界的受限空间,提出一种环境自适应区域栅格化的优化路径规划算法.该算法首先将环境自适应划分为区域栅格,并提出阻碍度指标降低搜索空间的维度以优化区域栅格的划分;然后结合随机变异和定向变异,给出一种可有效平衡搜索效率与精度矛盾的多维变异粒子群优化算法;最后使用最小二乘曲线拟合方法对优化路径予以平滑处理.与非线性递减惯性权值粒子群算法（NDW-PSO）及组合粒子群算法（C-PSO）对比的仿真结果验证了所提出算法的先进性.     

On robotic optimal path planning in polygonal regions with pseudo-Euclidean metrics.

This paper presents several results on some cost-minimizing path problems in polygonal regions. For these types of problems, an approach often used to compute approximate optimal paths is to apply a discrete search algorithm to a graph G(epsilon) constructed from a discretization of the problem; this graph is guaranteed to contain an epsilon-good approximate optimal path, i.e., a path with a cost within (1 + epsilon) factor of that of an optimal path, between given source and destination points. Here, epsilon > 0 is the user-defined error tolerance ratio. We introduce a class of piecewise pseudo-Euclidean optimal path problems that includes several non-Euclidean optimal path problems previously studied and show that the BUSHWHACK algorithm, which was formerly designed for the weighted region optimal path problem, can be generalized to solve any optimal path problem of this class. We also introduce an empirical method called the adaptive discretization method that improves the performance of the approximation algorithms by placing discretization points densely only in areas that may contain optimal paths. It proceeds in multiple iterations, and in each iteration, it varies the approximation parameters and fine tunes the discretization.     

Genetic algorithm-based optimisation of load-balanced routing for AMI with wireless mesh networks

The advanced metering infrastructure (AMI) in a smart grid contains hardware, software, and other electronic components connected through a communication infrastructure. AMI transfers meter-reading data between a group of smart meters and a utility centre. Herein, a wireless mesh network (WMN) with a random mesh topology is used to deploy the AMI communication network. In a WMN, paths are identified using a hybrid wireless mesh routing protocol (HWMP) with a load balancing feature called load aware-HWMP (LA-HWMP). These paths reduce the demand on links with a minimal air time metric; however, the delay in the data transmission of certain smart meters is high, given the large number of retransmissions caused by packet drop. To avert this problem and enhance the end-to-end delay, a genetic algorithm is applied on the LA-HWMP to obtain the optimal path. The optimisation process will result in the selection of paths with minimal delay. The genetic algorithm is developed with a rank-based selection, a two-point crossover, and a random reset mutation with a repair function to eliminate duplicate entries. The proposed method is compared with the HWMP, the LA-HWMP, and a state-of-the-art method that uses a combination of the ant colony algorithm and simulated annealing (ACA-SA) for AMI networks of different sizes. The obtained results show that the path identified by the proposed method yields a shorter delay and higher throughput than paths identified using the other methods.     

基于模糊连接度的图像分割及算法

提出了一种基于模糊连接度图像分割的方法,在模糊连接度分割的基础上增加了最优路径(即与种子点的所有路径中连接度最大的路径)上各点相对于种子点的属性相似度的检验,使之能在待分割对象边界比较模糊的情况下取得理想的分割结果.同时提出了一种基于图像扫描机制的算法,它以种子点为中心,逐个计算邻居点相对于种子点的模糊连接度,该算法充分利用模糊连接度和属性相似度的性质,能简单、快速地找到两点间的最优路径.实验结果表明,该方法快速、有效地提高了图像分割的质量.