遗传融合蚁群算法的改进与仿真

原有的遗传融合蚁群算法虽然克服了基本蚁群算法的不足,优化效果得到了改善,能够克服收敛速度较慢,易出现停滞,以及全局搜索能力较低的缺陷。但是还不够,因此,在原有的遗传融合蚁群算法的基础上进行了许多改进以扩大解的搜索空间,更加提高其全局优化寻优速度。并将遗传融合蚁群算法和改进的遗传融合蚁群算法分别应用于TSPLIB中的Att532TSP问题进行了仿真实验。仿真研究表明,改进后的算法具有更优良的全局优化性能,效果令人满意。     

基于蚁群算法的泊位调度优化与仿真

在全球贸易经济聚焦在中国的同时,港口的吞吐能力成为目前港口业的主要矛盾。提高泊位这个环节的运作能力,减少船舶在港时间,增加港口的吞吐能力成为主要研究对象。本文采取仿真模型与优化算法相结合的研究方法,把泊位调度问题转化为旅行商问题,建立了一个泊位岸桥协调调度,通过蚁群算法建立数学模型,使船舶在港时间最短为目标建立函数,求得最佳调度方案。用ProModel建立船舶到港停泊及离港仿真模型。验证泊位调度优化的有效性,以便指导港口实际的泊位调度。     

蚁群算法的研究现状

蚁群算法是一种新型的模拟进化算法，研究表明该算法具有很好的通用性和鲁棒性．在离散的组合优化问题中实验，取得了良好的效果。介绍了蚁群算法的原理，对目前蚁群算法的研究进展情况进行了分析，同时对比国内外的研究状况提出了自己的观点，以推动该算法在更广阔的领域内得到应用。     

基于遗传多蚁群算法的QoS组播路由算法研究

提出了一种基于遗传多蚁群的QoS组播路由算法,前期利用遗传算法的快速性、全局收敛性生成蚁群算法的初期信息素;后期引入多蚁群思想,克服蚁群算法容易陷入局部最优,导致算法停滞的缺点.仿真结果表明,该算法在多节点情况下具有更强的寻优能力和可靠性,是一种有效的QoS路由方法.     

具有新型遗传特征的蚁群算法

蚁群算法是一种新型的模拟进化算法,具有很好的通用性和鲁棒性,在解决组合优化问题方面有良好效果,但存在如计算时间较长、容易陷入局部最优等问题。本文在蚁群算法的基础上,引入了杂交及变异机制,提出了一种具有新型变异特征的蚁群新算法,在减少计算时间的同时可避免早熟现象。     

二进制蚁群进化算法

从生物进化角度将群体中的每只昆虫看成一个神经元,彼此之间通过随机、松散的连接组成一个神经网络;然后类似于人工神经网络模拟蚂蚁群体智能, 提出了一个二元网络. 由于采用二进制编码对单个蚂蚁的智能行为要求比较低,对应的存储空间相对较少,使得算法的效率有较大的提高. 通过测试函数优化和多维0/1 背包问题结果表明该算法具有较好的收敛速度和稳定性,非常好的求解结果.     

具有变异特征的蚁群算法

蚁群算法是一种新型的模拟进行算法,初步的研究已经表明该算法具有许多优良的性质,但该算法也存在一些缺点,如计算时间较长。     

蚁群算法不确定性分析

蚁群算法作为一种开创性的生物仿真算法,因其具有并行性、鲁棒性等优良性质得到了广泛的应用。在对蚁群算法进行系统仿真的实验中,发现蚁群算法存在很多不确定因素。这些因素对蚁群算法的性能造成不同程度的影响,作为一种基于实验的研究性的探讨,本文对所发现的不确定因素做了分析,并根据分析结果对蚁群算法作了相应的改进。     

可靠性优化的蚁群算法

建立了可靠性冗余优化模型,分析了各种优化方法的优缺点。采用模拟退火算法、遗传算法和蚁群算法分别解决了此问题,并通过实例,结果表明蚁群算法比较有效。     

求解Job-shop调度问题的遗传蚁群算法*

描述了Job-shop调度问题,研究遗传算法和蚁群算法在解决Job-shop问题中的优点和不足,融合遗传算法和蚁群算法设计了遗传蚁群算法以求解Job-shop调度问题,并对算法进行了仿真实验,通过与遗传算法、蚁群算法及已有的遗传算法和蚁群算法的融合算法结果的对比,验证了该算法的有效性。     

Integrated process planning and scheduling by an agent-based ant colony optimization

This paper presents an ant colony optimization (ACO) algorithm in an agent-based system to integrate process planning and shopfloor scheduling (IPPS). The search-based algorithm which aims to obtain optimal solutions by an autocatalytic process is incorporated into an established multi-agent system (MAS) platform, with advantages of flexible system architectures and responsive fault tolerance. Artificial ants are implemented as software agents. A graph-based solution method is proposed with the objective of minimizing makespan. Simulation studies have been established to evaluate the performance of the ant approach. The experimental results indicate that the ACO algorithm can effectively solve the IPPS problems and the agent-based implementation can provide a distributive computation of the algorithm.     

Solving the traveling salesman problem using cooperative genetic ant systems

The travelling salesman problem (TSP) is a classic problem of combinatorial optimization and has applications in planning, scheduling, and searching in many scientific and engineering fields. Ant colony optimization (ACO) has been successfully used to solve TSPs and many associated applications in the last two decades. However, ACO has problem in regularly reaching the global optimal solutions for TSPs due to enormity of the search space and numerous local optima within the space. In this paper, we propose a new hybrid algorithm, cooperative genetic ant system (CGAS) to deal with this problem. Unlike other previous studies that regarded GA as a sequential part of the whole searching process and only used the result from GA as the input to subsequent ACO iterations, this new approach combines both GA and ACO together in a cooperative manner to improve the performance of ACO for solving TSPs. The mutual information exchange between ACO and GA in the end of the current iteration ensures the selection of the best solutions for next iteration. This cooperative approach creates a better chance in reaching the global optimal solution because independent running of GA maintains a high level of diversity in next generation of solutions. Compared with results from other GA/ACO algorithms, our simulation shows that CGAS has superior performance over other GA and ACO algorithms for solving TSPs in terms of capability and consistency of achieving the global optimal solution, and quality of average optimal solutions, particularly for small TSPs.     

Applications and environments for multi-agent systems

This paper addresses multi agent system (MAS) environments from an application perspective. It presents a structured view on environment-centric MAS applications. This comprises three base configurations, which MAS applications may apply directly or combine into a composite configuration. For each configuration, the paper presents key issues, requirements and opportunities (e.g. time management issues, real-world augmentation opportunities and state snapshot requirements). Thus, the paper delineates what environment technology may implement to serve MAS applications. Sample applications illustrate the configurations. Next, electronic institutions provide an example of an environment technology, addressing norms and laws in an agent society, already achieving some maturity. In comparison, application-domain specific environment technologies still are in embryonic stages.     

MAGAD-BFS: A learning method for Beta fuzzy systems based on a multi-agent genetic algorithm

This paper proposes a learning method for Beta fuzzy systems (BFS) based on a multiagent genetic algorithm. This method, called Multi-Agent Genetic Algorithm for the Design of BFS has two advantages. First, thanks to genetic algorithms (GA) efficiency, it allows to design a suitable and precise model for BFS. Second, it improves the GA convergence by reducing rule complexity thanks to the distributed implementation by multi-agent approach. Dynamic agents interact to provide an optimal solution in order to obtain the best BFS reaching the balance interpretability-precision. The performance of the method is tested on a simulated example.     

Integration in industrial automation based on multi-agent systems using cultural algorithms for optimizing the coordination mechanisms

Integration in industrial automation can be approached from the theory of Distributed Artificial Intelligence. One approach is the modeling of different production units by agents that interact through interaction protocols, which are implemented following a coordination mechanism. Under this approach, integration in automation can be achieved through the optimization of implicit interactions in such mechanisms. This paper presents a strategy for integrating industrial processes based on Multi-Agent Systems (MAS), which consists of optimizing coordination mechanisms that implement conversations between agents, by using cultural algorithms. The cultural algorithm uses formal models of interaction protocols between agents, such as auction and tender, and the integration scheme comes from automation architectures based on MAS, to which their interactions are optimized. The proposed scheme enables data and service-oriented integration. The proposed strategy is applied in two industrial case studies related to the oil production process.     

Edge detection using ant algorithms

In this paper a new algorithm for edge detection using ant colony search is proposed. The problem is represented by a directed graph in which nodes are the pixels of an image. To adapt the problem, some modifications on original ant colony search algorithm (ACSA) are applied. A large number of experiments are employed to determine suitable algorithm parameters. We drive an experimental relationship between the size of the image to be analyzed and algorithm parameters. Several experiments are made and the results suggest the effectiveness of the proposed algorithm.     

First steps to the runtime complexity analysis of ant colony optimization

The paper presents results on the runtime complexity of two ant colony optimization (ACO) algorithms: ant system, the oldest ACO variant, and GBAS, the first ACO variant for which theoretical convergence results have been established. In both cases, as the class of test problems under consideration, a slight generalization of the well-known OneMax test function has been chosen. The techniques used for the runtime analysis of the two algorithms differ: in the case of GBAS, the expected runtime until the optimal solution is reached is studied by a direct bound estimation approach inspired by comparable results for the (1+1)$(1+1)$ evolutionary algorithm (EA). A runtime bound of order O(mlogm)$O(m\log m)$, where m   is the problem instance size, is obtained. In the case of ant system, the original discrete stochastic process is approximated by a suitable continuous deterministic process. The validity of the approximation is shown by means of a rigid convergence theorem exploiting a classical result from mathematical learning theory. Using this approximation, it is demonstrated that for the considered OneMax-type problems, a runtime of order O(mlog(1/ε))$O(m\log (1/\epsilon ))$ until reaching an expected relative   solution quality of 1-ε$1-\epsilon$, and a runtime of O(mlogm)$O(m\log m)$ until reaching the optimal   solution with high probability can be predicted. Our results are the first to show competitiveness in runtime complexity with (1+1$1+1$) EA on OneMax for a proper ACO algorithm.     

Optimal design of truss structures using ant algorithm

An ant algorithm, consisting of the Ant System and API (after “apicalis” in Pachycondyla apicalis) algorithms, was proposed in this study to find optimal truss structures to achieve minimum weight objective under stress, deflection, and kinematic stability constraints. A two-stage approach was adopted in this study; first, the topology of the truss structure was optimized from a given ground structure employing the Ant System algorithm due to its discrete characteristic, and then the size and/or shape of member was optimized utilizing the API algorithm. The effectiveness of the proposed ant algorithm was evaluated through numerous different 2-D and 3-D truss-structure problems. The proposed algorithm was observed to find truss structures better than those reported in the literature. Moreover, multiple different truss topologies with almost equal overall weights can be found simultaneously.