共查询到20条相似文献,搜索用时 109 毫秒
1.
针对柔性作业车间批量流调度问题,基于快速换模技术,考虑可变子批划分柔性、子批混排加工柔性、自动换模柔性和物料运输柔性,建立以最小化完工时间和加工子批总数为目标的混排调度优化模型,并提出一种改进双档案多目标进化算法以优化目标函数。基于进化算法框架,设计了基于超体积指标和基于改进帕累托支配的双档案筛选机制,以平衡种群的收敛性和多样性;针对批量流混排调度问题特征,在解码阶段提出正/逆解码和子批拆分左移策略,在邻域探索和全局搜索阶段分别设计子批划分和混排调度的自适应进化算子,以提高算法的全局搜索与局部搜索能力。基于不同规模算例,测试了提出算法与经典多目标算法的性能。实验结果表明,该算法在收敛性与多样性上具有明显优势。 相似文献
2.
硬件任务的软实时调度是影响动态可重构系统性能的关键因素之一。本文提出了一种基于顶点链表的硬件任务间最小空间调度算法MSSA,该算法将硬件任务按照长、宽及调度时间构成一个三维资源模型,以到达任务与已放置任务在三维空间的邻接度来构建代价函数,获取具有最大代价函数值的放置位置和启动时间,可使任务安排得更紧凑,减小对系统资源的浪费,提高并行度。仿真实验表明,与MSG-4V和Stuffing算法相比,本文算法具有更高的芯片利用率和任务接受率。 相似文献
3.
考虑晶圆加工过程中的多品种和与次序相关的换模时间约束,以系统总完工时间最小为优化目标,建立混合流水车间MOJ调度模型.在此基础上,提出了基于作业-产品-机器三层析取网络流的列生成算法.为进一步改善列生成算法存在的尾效应,将基于次梯度优化的拉格朗日松弛算法嵌入列生成算法框架中,构建了采用双重迭代的改进型列生成(MCG)算法.最后,通过理论分析和仿真实验表明了MCG算法是有效、可行的. 相似文献
4.
在半导体晶圆制造过程中,调整设备相关参数来提高晶圆质量的同时会造成换模时间的增加,从而影响生产效率.并且考虑到半导体晶圆制造可重入的特性,论文对带换模约束的可重入流水车间进行了研究,提出了混合蚁群分布估计算法.首先对该问题进行了问题描述,并以系统makespan最小化为目标建立数学规划模型,随后将分布估计算法融入蚁群算法,以提高蚁群算法的全局搜索能力.最后实验结果验证了所提出算法的有效性. 相似文献
5.
6.
针对钢铁生产中加热炉调度问题,考虑炉容受限的情况,以最小化板坯的Makespan和最小化总在炉加工时间为目标建立问题的多目标优化模型,将其归结为多旅行商问题。针对问题的NP-难特性,提出一种改进的修复式约束满足算法求解。松弛炉容约束得到初始调度,在检测冲突变量并构造冲突板坯的可替换加热炉集合的基础上,以开工时间偏移最小规则为冲突板坯重新指派加热炉,得到可行的调度方案。数据实验验证了模型和算法的可行性和有效性。 相似文献
7.
针对柔性作业车间生产环境中机器故障的动态调度问题, 以最小最大完工时间和最小偏差为目标, 结合车间调度人员的经验建立多阶段人机协同动态调度策略. 在不同阶段该策略的调度人员可参与优化过程, 提高方案的可行性和稳定性. 设计外部精英库中最优解的更新方法, 依据海明距离保留具有相同目标值的多种调度方案. 最后通过实例仿真验证了该模型和算法的有效性、可行性和稳定性, 更便于有效地指导生产实践.
相似文献8.
9.
本文对应急物资调度模型的建立及求解该模型的优化算法进行了研究.首先,在资源受限情况下,以配送费用总成本最小和最大缺失损失最小为优化目标,建立了连续消耗问题的多供应点对多受灾点的应急物资调度模型.然后,通过引入DE/best/1变异策略与DE/rand/2变异策略对差分进化算法进行了改进,提出了一种基于双变异策略的改进差分进化算法,将Pareto非支配等级分层与拥挤距离的概念引入到改进差分进化算法中,对约束双目标调度模型进行求解.最后,通过两种不同规模的四组仿真实验,验证了本文提出模型及改进的差分进化算法的可行性和有效性.与基本差分进化算法对比,双变异策略的改进差分进化算法对相同应急物资调度问题进行求解时,得到了更多的Pareto前沿解个数,和较低的应急物资调度配送费用成本与较小的最大缺失损失,同时解分布的广泛性也得到了显著提高. 相似文献
10.
11.
S. Shaw 《Journal of Computer Assisted Learning》1993,9(2):93-99
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. 相似文献
12.
European Community policy and the market 总被引:1,自引:0,他引:1
C. Lloyd 《Journal of Computer Assisted Learning》1993,9(2):86-91
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. 相似文献
13.
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。 相似文献
14.
张涛 《计算机测量与控制》2015,23(1):86-89
为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值. 相似文献
15.
Wayne O’Brien Author Vitae 《Journal of Systems and Software》2008,81(11):1997-2013
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. 相似文献
16.
17.
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. 相似文献
18.
潘丽 《自动化与仪器仪表》2014,(7):80-82
自然界的绝大部分信号都是以模拟的形式存在,因此模拟信号的采集转换存储在数字时代十分关键。文章讨论了在雷达信号处理领域基于AD9626的AD采集存储卡的设计原理、硬件结构和程序设计与芯片配置等问题,为今后相关领域的研究提供了可参考的方案。 相似文献
19.
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 相似文献
20.
Jacob Palme 《Software》1979,9(9):741-747
The COM teleconferencing system was designed to be easy to use for both beginners and people with much computer experience. A number of design choices in organizing the human-computer interface were considered very carefully. These design problems are not unique for teleconferencing applications, but will appear in many other developments of human-computer interfaces for non-computer specialists. This report discusses naming conventions, menu format, user commands, help facility and the treatment of ‘type ahead’ from the users. 相似文献