二元切触有理插值函数的构造方法

二元切触有理插值函数的构造方法大都是基于连分式进行的,其算法可行性是有条件的,且计算量较大,有理函数的次数较高。利用分段组合方法,构造出一种二元切触有理插值函数并将其推广到向量值切触有理插值情形,既解决了切触有理插值函数的存在性问题,又降低了切触有理插值函数的次数。相比于其他方法,其构造过程公式化,算法的可行性是无条件的,有理插值函数次数较低,且计算量较小,便于实际应用。     

矩形网格上二元矩阵切触有理插值的新方法

熟知的矩阵切触有理插值的方法都与连分式有关,不仅计算繁琐,而且难以避免出现“极点、不可达点”。用网格点构造有理插值基函数,用型值点构造具有承袭性的各阶矩阵插值算子,通过插值基函数与插值算子作线性运算,构造出二元矩阵各阶切触有理插值函数,有效避免了有理插值的“极点、不可达点”问题。若选择适当的参数,还可以任意降低插值函数的次数,数值例子表明了该方法简单、有效、实用性强。     

构造有理插值函数的一种参数法

对设定有理分式函数次数类型的有理插值问题研究,已有许多很多的结论。有理插值问题是否有解,取决于被插函数一些给定的函数值[f(xi),i=0,1,?,m+n]。指出分子和分母多项式次数之和为[N]的有理插值问题总有解,然后从设定的有理插值函数次数类型出发,引入正整参数[d],给出一种构造有理插值函数的方法。用该方法总可以构造出满足插值条件的有理分式函数,且有较大灵活性,计算量也不大。     

具有承袭性的切触有理插值算法

有理插值是函数逼近的一个重要内容,而降低切触有理插值的次数和解决切触有理插值函数的存在性是有理插值的一个重要问题。切触有理插值函数的算法大都是基于连分式进行的,其算法可行性是有条件的,且计算量较大。利用牛顿多项式插值承袭性的思想和分段组合的方法,构造出了一种无极点的切触有理插值函数,并推广到向量值切触有理插值情形;既解决了此类切触有理插值函数存在性问题,又降低了切触有理插值函数的次数。给出误差估计,并通过数值实例说明该算法具有承袭性、计算量低、便于实际应用等特点。     

广义逆张量Padé逼近的连分式递推算法

张量指数函数已经广泛应用于控制论、图像处理和各个工程领域.鉴于此,在矩阵广义逆的基础上,首次在张量内积空间上定义一种有效的张量广义逆,从而构造张量Padé逼近的一种连分式算法.利用张量t-积成功计算张量的幂,由此递推地给出张量指数函数的幂级数展开式.在前面两个工作的基础上,利用设计的连分式算法逼近张量指数函数,其特点在于,该算法可以编程实现递推计算,而且在计算过程中不必计算张量的乘积,也不必计算张量的逆.给出的两个张量指数函数的数值实验表明,将连分式算法与目前通常使用的截断法进行比较,在不降低逼近阶的条件下,所提出算法是有效的.如果张量的维数较大,基于张量广义逆的连分式算法仍然具有一定优势.     

一类二元有理插值曲面的有界性和逼近性质

构造了一种带参数的仅基于函数值的分子为双四次、分母为双二次的二元有理插值样条函数。得到了二元有理插值样条函数的矩阵表示,给出了插值曲面在插值区域上C1光滑的一个充分条件,讨论了插值基函数的性质和插值函数的有界性及误差估计。由于插值函数中含有参数,这样可以在插值数据不变的情况下通过对参数的选择进行插值曲面的局部修改。     

基于二元混合有理插值的形状渐变方法

为实现多个多边形间的平滑自然渐变,提出基于二元混合向量值有理插值的非线性二维形状渐变方法。将多个多边形的顶点坐标作为平面域上的向量,利用二元Newton-Thiele型向量连分式建立有理插值曲面,通过对插值曲面进行重采样得到一系列渐变中间多边形。实验结果表明,该方法具有计算精度高、适应性强、易于编程实现的特点。     

一种新的二元有理插值及其性质

构造了一种带参数的仅基于函数值的分子为双四次、分母为双二次的二元有理插值样条函数,插值函数具有简洁的显式表示。插值函数中含有4个参数,当这些参数满足一定条件时,插值曲面在插值区域上C1光滑。由于插值函数中含有参数,这样可以在插值数据不变的情况下通过对参数的选择进行插值曲面的局部修改。最后讨论了插值函数的一些性质。     

Thiele-Thiele型二元向量有理插值实现彩色图像的缩放

提出了一种基于Thiele-Thiele型有理向量插值的彩色图像插值方法。将数字图像的每一个像素点看成是一个平面域的关于RGB三原色的一个向量,在矩形网格上利用Samelson逆与倒差商技巧,根据图像的像素特征构造Thiele-Thiele型二元向量连分式有理插值函数,然后对插值曲面进行采样以实现缩放。采用该算法可以得到更加清晰的放大图像。实验结果表明,该方法是一种有效的图像缩放方法。     

Thiele Thiele型二元向量有理插值实现彩色图像的缩放*

提出了一种基于ThieleThiele型有理向量插值的彩色图像插值方法。将数字图像的每一个像素点看成是一个平面域的关于RGB三原色的一个向量,在矩形网格上利用Samelson逆与倒差商技巧,根据图像的像素特征构造ThieleThiele型二元向量连分式有理插值函数,然后对插值曲面进行采样以实现缩放。采用该算法可以得到更加清晰的放大图像。实验结果表明,该方法是一种有效的图像缩放方法。     

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.