基于模拟退火选择的动态免疫算法及其应用

借鉴人工免疫系统的记忆、动态识别等功能及模拟退火选择理论,提出一种适用于求解动态环境优化问题的动态免疫算法(DIASA),并将其用于高维动态约束背包问题。算法设计包括:(1)抗体的亲和力随群体进化而变化;(2)可行抗体被克隆和动态突变,突变概率与抗体浓度相关,而非可行抗体按价值密度贪婪修正;(3)新环境初始群经环境识别算子按不同方式生成,相似环境初始群由记忆细胞及随机抗体产生。数值实验中,选取著名的动态进化算法(ETGA)和动态免疫遗传算法(ISGA),通过不同难度的高维动态约束背包问题进行仿真比较,结果表明:DIASA较算法ISGA和ETGA对不同问题在各环境内表现较强的优化性能,群体中抗体多样性保持较好,能快速跟踪不同环境的最优值,收敛性强。     

动态免疫优化算法及其在背包问题中的应用

利用人工免疫系统的学习、记忆、识别等功能,提出一种动态免疫优化算法(DIOA),用于解决一类高维动态约束优化问题.其中对可行抗体进行克隆突变操作,非可行抗体按价值密度使用贪婪算法进行修正,环境识别模块借助记忆细胞产生新的环境初始群,从而加快算法收敛速度.利用DIOA求解不同环境下的高维背包问题,结果表明,与同类算法相比...     

求解高维动态背包问题的克隆修复免疫算法

高维动态背包问题(DKP)为一类较难求解的约束优化跟踪问题。为挖掘生物免疫系统的学习、记忆及识别功能,提出一种处理DKP的克隆修复免疫算法(IACR)。将抗体浓度融入亲和力的设计,运用环境识别规则判断当前环境是否相似或相同。通过环境记忆池保存一定量的记忆细胞,这些记忆细胞参与环境初始种群的产生,可用于提高算法的环境跟踪速度。采用贪婪修补策略提高可行抗体比例。测试IACR对不同变化幅率和频率的高维DKP的跟踪能力,并与4种同类算法进行比较。实验结果表明,IACR能更快速地适应环境变化,并具有较小的环境跟踪误差。     

混沌系统动态多目标免疫优化算法及其应用

生物免疫系统的自适应学习、免疫记忆、抗体多样性及动态平衡维持等功能,提出一种动态多目标免疫优化算法处理动态多目标优化问题.算法设计中,Logistic映射产生混沌抗体群;利用抗体的被控度和抗体拥挤距离设计抗体的亲和力;借助控制概念将群体分为非控群和被控群,再分别对其施行不同方式的突变增强群体的多样性;利用免疫记忆、Averagelinkage聚类方法,设计外部集和记忆集分别保存非控个体和亲和力较高抗体,所获的记忆细胞参与相似或相同环境初始抗体群的生成;借助三种不同类型的动态多目标优化测试问题,通过与两种最新的动态多目标进化算法及一种动态多目标克隆选择算法比较,数值实验论证了所提出算法在动态跟踪Pareto面的速度和执行效果上较其它算法优越.     

克隆选择免疫遗传算法对高维0/1背包问题应用

针对遗传算法求解高维背包问题收敛速度慢、易于陷入局部最优的缺点,基于生物免疫系统克隆选择原理,提出一种克隆选择免疫遗传算法。该算法中抗体采用二进制编码,通过抗体浓度设计抗体亲和力,进化群分离为可行群和非可行群,进化过程仅可行抗体动态克隆和突变,非可行抗体经修复算子获可行抗体。数值实验中,选取三种著名的算法用于四种高维的背包问题求解,结果表明:所提算法较其他算法具有更强的约束处理能力和快速收敛的效果。     

动态多目标免疫算法及其应用

基于生物免疫系统的机理及功能,提出一种动态多目标免疫算法。利用抗体的被控度及浓度设计抗体的亲和力。用环境记忆池保存优秀抗体,并依抗体浓度更新。记忆细胞参与相似或相同环境初始抗体群的生成。借助动态多目标测试问题,与同类算法仿真比较,结果表明,该算法较其他算法表现出更好的性能,能快速跟踪动态Pareto面且分布均匀,具有较强的求解实际动态问题的能力。     

改进的免疫优化算法对动态约束多目标问题的应用

基于进化理论的动态多目标优化算法极易陷入局部最优,跟踪动态Pareto有效面的速度及效果较差。基于免疫系统机理提出一种改进的免疫优化算法(DMIOA)用于动态约束多目标问题求解。算法通过抗体浓度及其支配度设计抗体与抗原亲和力,随机约束选择算子提高算法约束处理能力,环境识别算子自适应判断环境变化,根据识别结果以不同的方式产生新环境的初始抗体群。数值实验中,将DMIOA应用于两种动态标准测试问题及飞机减速器参数动态设计问题的求解,结果表明:DMIOA能快速跟踪动态Pareto有效面,且在各环境所获面分布均匀,具有较好的实际问题求解能力。     

动态多目标免疫优化算法及性能测试研究

基于生物免疫系统的自适应学习、免疫记忆、抗体多样性及动态平衡维持等功能，提出一种动态多目标免疫优化算法处理动态多目标优化问题．算法设计中，依据自适应ξ邻域及抗体所处位置设计抗体的亲和力，基于Pareto控制的概念，利用分层选择确定参与进化的抗体，经由克隆扩张及自适应高斯变异，提高群体的平均亲和力，利用免疫记忆、动态维持和Average linkage聚类方法，设计环境识别规则和记忆池，借助3种不同类型的动态多目标测试问题，通过与出众的动态环境优化算法比较，数值实验表明所提出算法解决复杂动态多目标优化问题具有较大潜力．     

自适应免疫算法及其对动态函数优化的跟踪

基于生物免疫系统的自适应学习、记忆、监视等功能,设计适用于高维动态函数优化的自适应免疫算法.算法设计中,利用抗体的学习功能设计抗体动态进化模块;利用基因漂移促成抗体群中非优越抗体重构;利用记忆特性和记忆池动态维持功能,设计由记忆子集合构成的动态记忆池,并经由Average linkage保存优秀的记忆细胞;利用动态监视功能建立环境判别规则和初始抗体群的生成规则.该算法结构简单、灵活,以及在不同环境下寻优时间可以动态调节.数值实验比较显示出其优越性和在执行效率、执行效果中寻求权衡的有效性,并且对复杂的高维动态环境优化问题具有较大应用潜力.     

动态环境下基于预测机制的多种群进化算法

提出一种动态环境下基于预测机制的多种群进化算法,将预测机制引入到动态进化算法的研究中,对算法所得的某些信息进行记忆,根据记忆序列构建预测模型,当环境发生变化时能够通过预测模型对动态环境进行预先判断.算法采用自组织侦查的多种群策略,多个子种群对搜索子空间进行局部搜索,主种群用于确定新的搜索子空间.在子种群的自适应调整、子种群间的拥挤操作等方面进行了改进,根据子种群所跟踪的最优解位置信息构建预测模型,当环境发生变化时通过预测及子种群的进化实现对动态环境的自适应跟踪.以移动峰问题为测试对象,实验结果表明新算法具有良好的处理动态问题的能力.     

基于杂合机制的免疫遗传算法在动态问题中的应用

针对遗传算法在求解动态问题时存在多样性缺失,无法快速响应环境变化的问题,提出一种基于杂合子机制的免疫遗传算法．该算法借鉴免疫系统中多样性与记忆机理,从保持等位基因多样性出发,在免疫变异中引入杂合映射机制,使种群能够探索更大的解空间．同时,通过引入记忆策略,使算法迅速跟踪最优解变化轨迹．该方法在动态０-１优化问题的求解中取得了较好的效果．     

A hyper-heuristic based framework for dynamic optimization problems

Most of the real world problems have dynamic characteristics, where one or more elements of the underlying model for a given problem including the objective, constraints or even environmental parameters may change over time. Hyper-heuristics are problem-independent meta-heuristic techniques that are automating the process of selecting and generating multiple low-level heuristics to solve static combinatorial optimization problems. In this paper, we present a novel hybrid strategy for applicability of hyper-heuristic techniques on dynamic environments by integrating them with the memory/search algorithm. The memory/search algorithm is an important evolutionary technique that have applied on various dynamic optimization problems. We validate performance of our method by considering both the dynamic generalized assignment problem and the moving peaks benchmark. The former problem is extended from the generalized assignment problem by changing resource consumptions, capacity constraints and costs of jobs over time; and the latter one is a well-known synthetic problem that generates and updates a multidimensional landscape consisting of several peaks. Experimental evaluation performed on various instances of the given two problems validates that our hyper-heuristic integrated framework significantly outperforms the memory/search algorithm.     

动态环境下一种具有记忆能力的分布估计算法

以概率模型为基本记忆元素,对动态优化过程中所产生的历史信息进行记忆和利用,提出一种具有记忆能力的分布估计算法用以求解二进制编码动态优化问题.设计了基于环境辨识技术的记忆管理策略,并对种群多样性进行动态补偿.实验结果表明,该算法具有良好的通用性,所采用的多样性补偿策略能够保证算法种群对最优解的持续搜索能力.在对5个动态优化问题的实验中,该算法在绝大多数情况下都显著优于现有的另外两种动态进化算法.     

An immune system based differential evolution algorithm using near-neighbor effect in dynamic environments

Many real-world problems are dynamic,requiring optimization algorithms being able to continuously track changing optima(optimum) over time.This paper proposes an improved differential evolutionary algorithm using the notion of the near-neighbor effect to determine one individuals neighborhoods,for tracking multiple optima in the dynamic environment.A new mutation strategy using the near-neighbor effect is also presented.It creates individuals by utilizing the stored memory point in its neighborhood,and utilizing the differential vector produced by the ’nearneighbor -superior’ and ’near-neighbor-inferior’.Taking inspirations from the biological immune system,an immune system based scheme is presented for rapidly detecting and responding to the environmental changes.In addition,a differencerelated multidirectional amplification scheme is presented to integrate valuable information from different dimensions for effectively and rapidly finding the promising optimum in the search space.Experiments on dynamic scenarios created by the typical dynamic test instance—moving peak problem,have demonstrated that the near-neighbor and immune system based differential evolution algorithm(NIDE) is effective in dealing with dynamic optimization functions.     

Multiobjective optimization immune algorithm in dynamic environments and its application to greenhouse control

A novel multiobjective optimization immune algorithm in dynamic environments, as associated with Pareto optimality and immune metaphors of germinal center in the immune system, is proposed to deal with a class of dynamic multiobjective optimization problems which the dimension of the objective space may change over time. Several immune operators, depending on both somatic maturation and T-cell regulation, are designed to adapt to the changing environment so that the algorithm can achieve a reasonable tradeoff between convergence and diversity of population, among which an environmental recognition rule related to the past environmental information is established to identify an appearing environment. Preliminary experiments show that the proposed algorithm cannot only obtain great superiority over two popular algorithms, but also continually track the time-varying environment. Comparative analysis and practical application illustrate its potential.     

Immune Algorithm with Adaptive Sampling in Noisy Environments and Its Application to Stochastic Optimization Problems

An immune optimization algorithm in noisy environments, suitable for high-dimensional stochastic optimization problems, is proposed based on the hypothesis test and simplified immune metaphors of c. The focus of design is concentrated on constructing three types of operators: (1) population sampling that decides sampling sizes of both the current population and the memory set, (2) sample-allocation scheme, and (3) antibody evolution that is aimed at designing several immune operators to evolve some potential antibodies into better ones. The algorithm, depending on dynamic suppression radiuses and suppression probabilities of antibodies from evolving populations, can strongly suppress noise and rapidly discover the desired solution, even if prior information on noise is unknown. Experimental results and comparison with three well-known algorithms show that the proposed algorithm can achieve satisfactory performances including the quality of optimization, noise compensation and performance efficiency.