基于克隆选择原理的免疫算法

提出了一种基于克隆选择原理的人工免疫算法(AIA),该算法中引入了克隆选择、克隆删除、受体编辑、体细胞高频变异等思想,并将其应用到广义最小生成树(GMST)的求解当中,仿真结果证明提出的免疫算法能迅速收敛到全局最优解,显著提高了全局收敛可靠性和全局收敛速度。     

基于改进蚁群算法的车辆路径仿真研究

针对基本蚁群算法收敛速度慢、易陷于局部最优等缺陷,提出了一种改进蚁群算法.通过车辆的满载率调整搜索路径上的启发信息强度变化,对有效路径采取信息素的局部更新和全局更新策略,并对子可行解进行3-opt优化,在实现局部最优的基础上保证可行解的全局最优.通过对22城市车辆路径实例的仿真,仿真结果表明,改进型算法性能更优,同基本蚁群相比该算法的收敛速度提高近50%,效果显著,该算法能在更短时间内求得大规模车辆路径问题满意最优解,说明其具有较好的收敛速度和稳定性.     

基于改进蚁群算法的机器人路径规划研究

机器人自主移动导航是近年来研究的热点.针对蚁群优化(ACO)算法存在收敛速度慢以及易陷入局部最优的问题,提出了一种改进的ACO算法来解决机器人路径规划问题.上述算法将改进的人工势场(APF)算法和蚁群算法相结合,采用改进APF算法进行初始地图规划,减少了ACO算法初始规划的盲目性.算法利用A*算法的评估函数以及路径转折角度来改进启发函数,引入启发信息递增函数,免于局部最优的同时保证收敛速度.改进算法的信息素更新机制和路径评价函数,提高了算法的全局最优性,使得到的路径更符合实际需求.通过改进该算法的信息素更新机制和路径评价函数,提高了算法的全局最优性,得到的路径更符合实际需求.仿真结果表明,改进算法能提升收敛速度和最优解.     

求解TSP问题的自适应模拟退火蚁群算法

针对蚁群算法易陷入局部最优,收敛速度较慢的问题,在最大-最小蚁群算法的基础上,提出一种自适应模拟退火蚁群算法。在高温阶段以一定概率接受次优解,优化每次迭代后的路径,增加算法的全局搜索能力,并采用一种自适应的信息素更新策略,前期增加算法的全局搜索能力,后期加快算法的收敛速度;在低温阶段通过降温系数的取值,加快算法收敛速度,在温度机制上采用了回火机制,避免局部最优,使解的质量得到了提高。同时在算法中结合了3opt进一步优化了算法解的质量。实验结果表明该算法的收敛速度以及求解质量得到了一定程度的改善,较好地平衡了种群多样性以及收敛速度的关系。     

基于改进的选择算子和交叉算子的遗传算法

为了有效解决遗传算法中收敛速度与局部最优解的矛盾,文中提出了一种具有改进的选择算子和改进的交叉算子的遗传算法。使用文中改进的选择算子,能够增加算法收敛于全局最优解的概率,从而不容易陷入局部最优,也就增加了找到最优解的概率,使用文中改进的交叉算子可以加快算法的收敛速度,从而缩短寻找最优解的时间。实验证明,这两种改进算子的结合能以较快速度收敛于全局最优解,因此能很好地解决遗传算法中收敛速度与局部最优解之间的矛盾。     

基于改进的选择算子和交叉算子的遗传算法

为了有效解决遗传算法中收敛速度与局部最优解的矛盾,文中提出了一种具有改进的选择算子和改进的交叉算子的遗传算法。使用文中改进的选择算子,能够增加算法收敛于全局最优解的概率,从而不容易陷入局部最优,也就增加了找到最优解的概率,使用文中改进的交叉算子可以加快算法的收敛速度,从而缩短寻找最优解的时间。实验证明,这两种改进算子的结合能以较快速度收敛于全局最优解,因此能很好地解决遗传算法中收敛速度与局部最优解之间的矛盾。     

一种混沌编码的粒子群优化算法及其应用

研究粒子群优化算法.传统的粒子群算法采用实数编码,收敛速度慢.为了提高收敛速度,提出了一种混沌编码的粒子群优化算法.混沌编码作为一种全新的数学编码方式,更能准确地表达编码对象的多样性,将混沌编码应用到粒子群优化算法中,使算法在初期的搜索区域更大,更快找到全局最优解.把混沌编码的粒子群算法与BP算法相结合用来优化神经网络.利用混沌编码的粒子群算法快速找到全局最优位置的邻域,然后再用BP算法进行局部寻优,收敛到全局最优位置.仿真结果证明混沌编码的粒子群神经网络比实数编码的粒子群神经网络分类收敛速度更快,验证了算法的有效性.     

基于Kent映射的混合混沌优化算法

针对混沌优化算法易陷入局部最优、收敛慢和精度低的缺点,提出一种改进的变尺度混合混沌优化算法。为保证算法的全局收敛性,采用具有更好遍历性的Kent混沌映射代替传统的Logistic混沌映射;为提高收敛速度和解的精度,引入新的变尺度因子,在搜索最优解的末期使用Nelder‐Mead单纯形法。通过数值实验对相关的4种算法进行比较,比较结果表明,该算法可以保证解的全局最优性、提高算法的收敛速度并提高获得的最优解精度。     

基于混合行为的蚁群算法

针对基本蚁群算法易出现停滞、收敛速度慢的问题,在最大最小蚁群算法的基础上提出了一种基于混合行为的蚁群(HBAC)算法,通过引入停止蚂蚁来构造局部路线方式和增加全局调优策略,提高了算法的搜索能力和收敛速度,同时将蚂蚁所寻找的各条路径的信息素限定在一个可动态调整的范围之内,避免了算法过早陷于局部最优解.通过HBAC算法同其他蚁群算法在求解旅行商问题上的实验比较,发现该算法拥有较快的收敛速度,提高了全局最优解搜索能力,在性能上有了较大的提高.     

基于一种改进的遗传算法的空间聚类分析

空间数据挖掘是数据挖掘的一个研究分支。空间聚类分析是空间数据挖掘的一个重要的研究领域。传统的K-均值方法用于聚类具有收敛速度快、算法实现简单等特点,但容易陷入局部最优,并对初始解敏感。遗传算法是一种全局搜索算法,但是收敛速度较慢。提出一种改进的遗传算法进行聚类,该算法通过全局搜索与局部搜索相结合,取得较好效果。实验表明:文中提出的算法在聚类分析中搜索到全局最优解(或近似全局最优解)的能力要优于经典的K-均值聚类算法,且局部收敛速度和全局收敛性能较好。     

基于改进的AIA优化ANN的多移动机器人追捕研究

建立了一个包含多个捕猎机器人和单个猎物机器人的动态空间模型,并构建了捕猎机器人的AIAE-ANN行为决策系统。人工神经网络(ANN)所有的连接权值采用改进型人工免疫算法(AIAE)进行优化,使神经网络的性能不断得到进化,最终可生成一个性能优良的行为决策系统,从而完成捕猎机器人的围捕。仿真实验表明:用AIAE训练,能有效地应用于追捕系统的多移动机器人研究。     

基于动态层次分析的自适应多目标粒子群优化算法及其应用

提出一种基于动态层次分析的自适应多目标粒子群优化算法,利用模糊一致矩阵层次分析法选取全局最优粒子,保证进化方向的合理性和客观性。在进化过程中对种群状态进行客观度量,自适应更新种群的权重和学习因子等重要参数,使种群进化具有自我调节能力。将提出的算法分别应用于标准多目标测试函数、PID控制器参数优化和甲醇转化烃类物质的工业过程模型辨识中,通过与其他算法的对比说明了所提出算法的有效性和可行性。     

Hybridizing ant colony optimization via genetic algorithm for mixed-model assembly line balancing problem with sequence dependent setup times between tasks

This paper presents a new hybrid algorithm, which executes ant colony optimization in combination with genetic algorithm (ACO-GA), for type I mixed-model assembly line balancing problem (MMALBP-I) with some particular features of real world problems such as parallel workstations, zoning constraints and sequence dependent setup times between tasks. The proposed ACO-GA algorithm aims at enhancing the performance of ant colony optimization by incorporating genetic algorithm as a local search strategy for MMALBP-I with setups. In the proposed hybrid algorithm ACO is conducted to provide diversification, while GA is conducted to provide intensification. The proposed algorithm is tested on 20 representatives MMALBP-I extended by adding low, medium and high variability of setup times. The results are compared with pure ACO pure GA and hGA in terms of solution quality and computational times. Computational results indicate that the proposed ACO-GA algorithm has superior performance.     

Hyper-Spherical Search (HSS) algorithm: a novel meta-heuristic algorithm to optimize nonlinear functions

This paper proposes a novel optimization algorithm called Hyper-Spherical Search (HSS) algorithm. Like other evolutionary algorithms, the proposed algorithm starts with an initial population. Population individuals are of two types: particles and hyper-sphere centers that all together form particle sets. Searching the hyper-sphere inner space made by the hyper-sphere center and its particle is the basis of the proposed evolutionary algorithm. The HSS algorithm hopefully converges to a state at which there exists only one hyper-sphere center, and its particles are at the same position and have the same cost function value as the hyper-sphere center. Applying the proposed algorithm to some benchmark cost functions shows its ability in dealing with different types of optimization problems. The proposed method is compared with the genetic algorithm (GA), particle swarm optimization (PSO) and harmony search algorithm (HSA). The results show that the HSS algorithm has faster convergence and results in better solutions than GA, PSO and HSA.     

Two-stage hybrid flow shop scheduling on parallel batching machines considering a job-dependent deteriorating effect and non-identical job sizes

In this paper, we investigate a specialized two-stage hybrid flow shop scheduling problem with parallel batching machines considering a job-dependent deteriorating effect and non-identical job sizes simultaneously. A novel concept of three-dimensional wasted volume based on the job normal processing time, job size, and job deteriorating rate is first proposed. Some structural properties, as well as a heuristic algorithm, are developed to solve the single parallel batching machine scheduling problem. Since the two-stage hybrid flow shop scheduling problem is NP-hard, a hybrid EDA-DE algorithm combining estimation of distribution algorithm (EDA) and differential evolution (DE) algorithm is proposed to tackle the studied problem. In addition, the Taguchi method of design of experiments (DOE) is implemented to tune the parameters of the EDA-DE. Finally, a series of computational experiments are carried out to compare the performance of the proposed hybrid EDA-DE algorithm and some recent existing algorithms from the literature, and the comparative results validate the effectiveness and efficiency of the proposed algorithm.     

双门限和机会协作的频谱感知算法研究

针对传统频谱感知算法性能较差及一文献中Zhu所提出的算法功率消耗大的不足,提出了一种基于双门限和机会协作的频谱感知算法,同时理论推导了在瑞利衰弱信道中基于该算法的频谱感知检测概率,并对传统频谱感知算法,Zhu所提出的算法和基于双门限和机会协作的频谱感知算法进行性能仿真。仿真结果表明,该算法可以有效提高频谱感知检测概率,性能优于传统算法,与Zhu所提出的算法性能基本相同,且能有效节省发射功率。     

A memory efficient stochastic evolution based algorithm for the multi-objective shortest path problem

Multi-objective shortest path (MOSP) problem aims to find the shortest path between a pair of source and a destination nodes in a network. This paper presents a stochastic evolution (StocE) algorithm for solving the MOSP problem. The proposed algorithm is a single-solution-based evolutionary algorithm (EA) with an archive for storing several non-dominant solutions. The solution quality of the proposed algorithm is comparable to the established population-based EAs. In StocE, the solution replaces its bad characteristics as the generations evolve. In the proposed algorithm, different sub-paths are the characteristics of the solution. Using the proposed perturb operation, it eliminates the bad sub-paths from generation to generation. The experiments were conducted on huge real road networks. The proposed algorithm is comparable to well-known single-solution and population-based EAs. The single-solution-based EAs are memory efficient, whereas, the population-based EAs are known for their good solution quality. The performance measures were the solution quality, speed and memory consumption, assessed by the hypervolume (HV) metric, total number of evaluations and memory requirements in megabytes. The HV metric of the proposed algorithm is superior to that of the existing single-solution and population-based EAs. The memory requirements of the proposed algorithm is at least half than the EAs delivering similar solution quality. The proposed algorithms also executes more rapidly than the existing single-solution-based algorithms. The experimental results show that the proposed algorithm is suitable for solving MOSP problems in embedded systems.     

Fast simulated annealing hybridized with quenching for solving job shop scheduling problem

Various heuristic based methods are available in literature for optimally solving job shop scheduling problems (JSSP). In this research work a novel approach is proposed which hybridizes fast simulated annealing (FSA) with quenching. The proposed algorithm uses FSA for global search and quenching for localized search in neighborhood of current solution, while tabu list is used to restrict search from revisiting previously explored solutions. FSA is started with a relatively higher temperature and as search progresses temperature is gradually reduced to a value close to zero. The overall best solution (BS) is maintained throughout execution of the algorithm. If no improvement is observed in BS for certain number of iterations then quenching cycle is invoked. During quenching cycle current temperature is reduced to nearly freezing point and iterations are increased by many folds, as a result of this change search becomes nearly greedy. The strength of the proposed algorithm is that even in quenching mode escape from local optima is possible due to use of Cauchy probability distribution and non-zero temperature. At the completion of quenching cycle previous values of search parameters are restored and FSA takes over, which moves search into another region of solution space. Effectiveness of proposed algorithm is established by solving 88 well known benchmark problems taken form published work. The proposed algorithm was able to solve 45 problems optimally to their respective best known values in reasonable time. The proposed algorithm has been compared with 18 other published works. The experimental results show that the proposed algorithm is efficient in finding solution to JSSP.     

An improved genetic algorithm for facility layout problems having inner structure walls and passages

This study proposes an improved genetic algorithm (GA) to derive solutions for facility layouts that are to have inner walls and passages. The proposed algorithm models the layout of facilities on gene structures. These gene structures consist of a four-segmented chromosome. Improved solutions are produced by employing genetic operations known as selection, crossover, inversion, mutation, and refinement of these genes for successive generations. All relationships between the facilities and passages are represented as an adjacency graph. The shortest path and distance between two facilities is calculated using Dijkstra's algorithm of graph theory. Comparative testing shows that the proposed algorithm performs better than other existing algorithms for the optimal facility layout design. Finally, the proposed algorithm is applied to ship compartment layout problems with the computational results compared with an actual ship compartment layout.Scope and purposeFacility layout problems (FLPs) concerning space layout optimization have been investigated in depth by researchers in many fields, such as industrial engineering, management science, and architecture, and various algorithms have been proposed to solve FLPs. However, these algorithms for the FLP cannot consider inner structure walls and passages within the block plan (or available area). They are also limited to a rectangular boundary shape of the block plan. Therefore, these algorithms could not be directly applied to problems having the curved boundary shape such as ship compartment layout, and an innovative algorithm which can treat such problems is needed. In this study, an improved genetic algorithm (GA) is proposed for solving problems having the inner structure walls and passages within an available area of a curved boundary. A comparative test of the proposed algorithm was performed to evaluate its efficiency. Finally, the proposed algorithm is applied to ship compartment layout problems with the computational results compared with an actual ship compartment layout. From the comparative test and the preliminary applications made to the ship's compartment layout, we demonstrate that the proposed algorithm has the ability to solve the FLPs having the inner structure walls and passages within the available area of the curved boundary.     

快速对角阵权系数协方差交叉融合容积卡尔曼滤波器

针对互协方差信息未知的多传感器系统,本文提出了一种快速对角阵权系数协方差交叉融合算法(FDCI).本文首先提出了一种对角阵权系数协方差交叉融合(DCI)方案,并证明了所提出DCI算法在融合估计精度上高于经典批处理CI融合(BCI)算法.在此基础之上,针对非线性等复杂的互协方差未知的多传感器系统,提出FDCI算法,并证明了所提出FDCI算法的无偏性及鲁棒精度. FDCI融合算法虽然在融合估计精度上低于DCI,但FDCI无需进行多权系数的非线性代价函数的优化问题,进而大大降低了计算负担,提高了系统的实时性.最后,结合容积卡尔曼滤波算法(CKF)提出了快速对角阵权系数协方差交叉融合容积卡尔曼滤波算法.仿真实例验证了所提出算法的正确性和有效性.