基于极大熵差分进化混合算法求解非线性方程组*

针对非线性方程组,给出了一种新的算法——极大熵差分进化混合算法。首先把非线性方程组转换为一个不可微优化问题;然后用一个称之为凝聚函数的光滑函数直接代替不可微的极大值函数,从而可把非线性方程组的求解转换为无约束优化问题,利用差分进化算法对其进行求解。计算结果表明,该算法在求解的准确性和有效性均优于其他算法。     

求解一类不可微多目标优化问题的社会认知算法*

针对一类不可微多目标优化问题,给出了一个新的算法——极大熵社会认知算法。利用极大熵方法将带有约束的不可微多目标优化问题转化为无约束单目标优化问题,然后利用社会认知算法对其进行求解。该算法是基于社会认知理论,通过一系列的学习代理来模拟人类的社会性和智能性从而完成对目标的优化。利用两个测试算例对其进行测试并与其他算法进行比较,计算结果表明,该算法在求解的准确性和有效性方面均优于其他算法。     

非线性l-1模极小化问题的极大熵差分进化算法

针对一类非线性l-1模极小化问题目标函数非光滑的特点给求解带来的困难,利用差分进化算法并结合极大熵函数法给出了解决此类问题的一种有效算法。利用极大熵函数将l-1模极小化问题转化为一个光滑函数的无约束最优化问题,利用差分进化算法对其进行求解。实验结果表明,该方法是有效的。     

基于极大熵和声搜索算法的非线性方程组求解

提出一种基于极大熵和声搜索(HS)的非线性方程组求解算法。利用极大熵函数代替不可微的极大值函数,从而将非线性方程组问题转化为一个无约束极小化问题,并通过HS算法对其进行求解。数值实验结果表明,与牛顿算法相比,该算法简单直观,具有较高的求解准确性。     

一种基于多策略差分进化的分解多目标进化算法

为了提高多目标优化问题非支配解集合的分布性和收敛性,根据不同差分进化策略的特点,基于切比雪夫分解机制,提出一种基于多策略差分进化的分解多目标进化算法(MOEA/D-WMSDE).该算法首先采用切比雪夫分解机制,将多目标优化问题转化为一系列单目标优化子问题;然后引入小波基函数和正态分布实现差分进化算法的参数控制,探究一种...     

动态罚函数法求解约束优化问题

针对罚函数法在求解约束优化问题时罚系数不易选取的问题,提出一种基于动态罚函数的差分进化算法.利用罚函数法将约束优化问题转化为无约束优化问题.为平衡种群的目标函数和约束违反程度,结合ε约束法设计了一种动态罚系数策略,其中罚系数随着种群质量和进化代数的改变而改变.采用差分进化算法更新种群直到搜索到最优解.对IEEE CEC...     

一类非线性极大极小问题的极大熵社会认知算法

针对一类非线性极大极小问题目标函数非光滑的特点给求解带来的困难,利用社会认知算法并结合极大熵函数法给出了此类问题的一种新的有效算法。首先利用极大熵函数将原问题转化为一个光滑无约束优化问题,然后利用社会认知算法对其进行求解。该算法是基于社会认知理论,通过一系列的学习代理来模拟人类的社会性以及智能性从而完成对目标的优化。数值结果表明,该算法收敛快,数值稳定性好,是求解非线性极大极小问题的一种有效算法。     

求解方程组的正交差分进化算法

首先利用代理约束概念和修正极大熵函数,将非线性方程组等价地转化为无约束优化函数;然后引入平均相似度概念,设计自适应正交交叉算子,利用正交设计产生初始种群,并在此基础上提出了自适应正交差分进化算法,用于求解修正极大熵函数;最后用方程组验证了算法的有效性。     

非线性约束规划的极大熵多目标进化算法

解非线性约束规划的困难在于如何处理问题的约束,从问题的约束条件出发构造了一个新的极大熵函数,利用此函数将原非线性约束规划问题转化成了两个目标的多目标优化问题。通过对搜索操作和参数的合理设计给出了一种新的极大熵多目标进化算法。计算机仿真表明该算法对带约束的非线性优化问题求解是非常有效的。     

一种多目标的覆盖优化策略在WSNs中的应用

针对目前无线传感器网络（WSNs）能量均衡覆盖策略大都基于节点静态感知能耗的不足,提出一种基于节点的动态能耗和网络覆盖率的多目标覆盖优化策略.该优化覆盖策略将动态路由协议引入到覆盖控制优化中,计算覆盖区域在不同节点分布下的动态通信能耗和网络的剩余能量,再结合区域覆盖率构成对覆盖和能量综合指数评价的优化函数.最后利用改进差分进化算法和差分进化算法对优化函数进行仿真,并利用覆盖结果验证策略的有效性.仿真结果表明：提出的覆盖优化策略既能使网络达到较高覆盖率,同时又能保证网络的能耗动态均衡,并将改进差分进化算法与常规差分进化算法比较,结果表明：前者克服了早熟现象,覆盖和能量的综合优化函数值更高,达到了6.184.     

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.     

基于QTE的蒙古文显示机制研究与实现

蒙古语言是中国蒙古族使用的通用语言,由于蒙古文区别于其他文字的书写方式和其自身变形机制等特点,在很多通用的文字处理引擎中都不被支持。在嵌入式产品开发与应用领域中Linux加QTE已经成为流行方式。该文给出了一种在QTE环境上实现基于标准Unicode的蒙古文点阵显示和变形算法, 并自定义了支持蒙古文的QTE组件,扩展了QTE功能,为在Linux加QTE方式的嵌入式体系结构中处理蒙古文提供了一种解决方法。     

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.     

基于AD9626的模拟信号采集存储卡设计

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。     

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     

煤矿井下安全监控分站的设计及其仿真实现

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.     

A human-computer interface for non-computer specialists

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.