基于改进蚁群算法的物流配送路径优化

随着社会的不断进步,配送车辆最短路径优化问题已广泛应用于交通运输、网络购物、物流配送等与生产生活息息相关的问题,然而配送车辆路径优化的计算比较复杂.文中建立在带约束条件的多车辆物流配送问题模型的基础上,运用改进的蚁群算法解决物流配送过程中的路径选择问题.通过对信息索的全局和局部更新规则进行改进,和传统的最值蚁群算法进行比较,算法的收敛速度和全局搜索能力得到提高.文中最后成功将改进后的蚁群算法应用于多车辆物流调度路径优化问题.结果表明该优化算法性能受优.     

基于路径交换的求解TSP混合蚁群算法

将蚁群算法与局部搜索优化算法结合,可抑制蚁群算法早熟收敛问题,并能提高蚁群算法的收敛速度。通过建立有效的局部搜索优化算法的参照优化边集,提高其求解质量和效率;引入路径交换策略提高蚁群算法的收敛速度和寻优能力。实验结果表明改进的混合蚁群算法能求解规模在2000个城市以内的旅行商问题的全局最优解。     

物流配送路径优化问题求解的量子蚁群算法

物流配送路径优化是一类实用价值很高的NP完全难题,针对传统启发式优化算法搜索速度慢、易陷入局部最优解的缺点,提出了一种量子蚁群算法的物流配送路径优化方法（QACA）。在物流配送路径优化问题分析的基础上建立相应的数学模型,通过量子蚁群算法对其进行求解,对各路径上的信息素进行量子比特编码,采用量子旋转门及最优路径对信息素进行更新,对QACA的性能进行仿真测试。仿真结果表明,QACA具有较强的全局搜索能力和收敛速度,可以有效解决物流配送路径问题。     

动态调整路径选择的蚁群优化算法

针对蚁群算法收敛速度慢和存在停滞现象的缺点,提出对比度增强的路径选择规则以增强其全局搜索能力,选择规则加强了对反馈信息的利用,能加快算法的收敛速度,通过信息熵来动态控制对比度增强的方向,在避免算法停滞的同时加快了算法的收敛速度。将改进后的蚁群优化算法与传统的蚁群优化算法进行比较,仿真实验结果表明,改进算法具有较好的稳定性和全局优化性能,且收敛速度较快。     

改进蚁群算法在机器人路径规划中的应用

针对传统蚁群算法在移动机器人路径规划问题中存在的易陷入局部最优与收敛速度慢等问题,提出一种改进的蚁群算法。根据起点到终点距离和地图参数构建全局优选区域,提高该区域内初始信息素浓度,避免算法初期盲目搜素;利用局部分块优化策略分别对各个子区域进行寻优并更新区域内最优路径信息素,增强局部搜索能力,加快收敛速度;对全局路径进行寻优,更新全局最优路径信息素。在信息素更新公式中引入信息素增强因子,加强最优路径信息素含量,应用反向学习优化信息素,改进状态选择概率,提高算法寻优能力。实验结果表明,改进后的算法明显提高了收敛速度,同时寻优能力更强。     

改进蚁群算法在AGV路径规划中的应用

针对传统蚁群算法在路径规划时,易陷入局部最优、前期路径有效性差等问题,对传统蚁群算法进行改进并应用到AGV（Automated Guided Vehicle）路径规划上。采用栅格地图建立小车工作空间模型,利用改进的头尾搜索机制,提高并加快了算法的全局搜索能力和前期收敛速度;引入奖惩因子与信息素最大最小阈值,对每代最优路径上的信息素进行奖励,最差路径上的进行惩罚,提高全局搜索能力;引入遗传算法变异因子,使算法跳出局部最优能力加强;采用遗传算法对改进的蚁群算法进行参数优化,减少参数对算法的影响。在VS2017和MATLAB软件平台上进行算法仿真。结果表明了该算法在避免局部最优和加快收敛速度方面有很大改进。     

蚁群算法在物流配送路径优化中的研究

研究物流配送路径优化问题,提高物流服务质量.针对快速准确送货,传统方法在物流配送路径优化过程,存在搜索时间长,得不到全局最优解,导致物流配送效率低的难题.为了提高物流配送路径优化效率,提出一种蚁群算法的物流配送路径优化算法.该算法首先建立优化物流配送路径的数学模型,然后采用蚁群算法对数学模型进行求解.仿真结果表明,蚁群算法具有较强的全局寻优能力,搜索速快,能够在最短时间找到流配送路径的最优解,是解决物流配送路径优化问题的有效算法.     

基于改进蚁群算法的有时间窗车辆路径优化研究

针对有时间窗的车辆路径优化问题．通过对蚁群算法的分析,设定信息素轨迹强度上下限,改进转移概率、信息素的更新方式,以提高算法的收敛速度和全局搜索能力。经过多次实验和计算．证明用改进的蚁群算法能有效地解决有时间窗的车辆路径优化问题。     

物流配送最短路径网搜索的改进蚁群算法

将蚁群优化的基本原理用到物流配送网最短路径搜索中,在充分考虑了物流配送网基本特性后,采用了一种基于加强方向性搜索、减少搜索范围的蚁群算法对其进行具体实现.改进的蚁群算法改善了基本蚁群算法中的随机搜索特性,使算法能以较快的速度收敛到最优解上.     

基于改进蚁群算法的机器人路径规划算法

针对机器人路径规划中,传统蚁群算法收敛速度慢、易陷入局部最优解等问题,提出了一种移动机器人路径规划的改进蚁群优化(ACO)算法。用栅格法建立环境模型,并基于人工势场建立启发信息素矩阵,降低了蚂蚁在初始阶段搜索的盲目性;引入激励函数,降低搜索过程中的死锁现象;改进信息素的更新机制,增强了优秀蚂蚁对全局路径规划的影响。仿真结果表明:改进后蚁群算法的机器人路径规划算法加快了收敛速度,具有较强的鲁棒性和全局寻优能力。     

Only connect: teaching, technology and telesis

Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.     

European Community policy and the market

Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.     

一种自适应子融合集成多分类器方法

融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。     

Avoiding semantic and temporal gaps in developing software intensive systems

Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them.     

Designing economic np control charts: A programmed simulation approach

This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives.     

The development of robot art

Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008     

Explanation and prediction: an architecture for default and abductive reasoning

Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.     

Three Process Perspectives: Organizations, Teams, and People

This paper provides the author's personal views and perspectives on software process improvement. Starting with his first work on technology assessment in IBM over 20 years ago, Watts Humphrey describes the process improvement work he has been directly involved in. This includes the development of the early process assessment methods, the original design of the CMM, and the introduction of the Personal Software Process (PSP)^SM and Team Software Process (TSP){^SM}. In addition to describing the original motivation for this work, the author also reviews many of the problems he and his associates encountered and why they solved them the way they did. He also comments on the outstanding issues and likely directions for future work. Finally, this work has built on the experiences and contributions of many people. Mr. Humphrey only describes work that he was personally involved in and he names many of the key contributors. However, so many people have been involved in this work that a full list of the important participants would be impractical.     

基于复小波噪声方差显著修正的SAR图像去噪

提出了一种基于复小波域统计建模与噪声方差估计显著性修正相结合的合成孔径雷达(Synthetic Aperture Radar,SAR)图像斑点噪声滤波方法。该方法首先通过对数变换将乘性噪声模型转化为加性噪声模型,然后对变换后的图像进行双树复小波变换(Dualtree Complex Wavelet Transform,DCWT),并对复数小波系数的统计分布进行建模。在此先验分布的基础上,通过运用贝叶斯估计方法从含噪系数中恢复原始系数,达到滤除噪声的目的。实验结果表明该方法在去除噪声的同时保留了图像的细节信息,取得了很好的降噪效果。     

How do children do mathematics with LOGO?

Abstract  This paper considers some results of a study designed to investigate the kinds of mathematical activity undertaken by children (aged between 8 and 11) as they learned to program in LOGO. A model of learning modes is proposed, which attempts to describe the ways in which children used and acquired understanding of the programming/mathematical concepts involved. The remainder of the paper is concerned with discussing the validity and limitations of the model, and its implications for further research and curriculum development.