一种基于数字分析的相位差测量方法

相位差的测量是电量测量的一项基本内容，有着广泛的应用。提出了一种基于数字分析的相位差测量方法，其基本思想为采用中断技术扫描被测信号的波形，然后对扫描结果进行数字分析以求得相位差。该方法有效地避免了矩形波边沿抖动问题，能够比较容易地排除干扰信号，并能够对因被测信号中含有直流分量或运算放大器零点漂移等原因引起的矩形波边沿位置偏移问题进行修正。实际应用表明，该方法的测量结果准确、稳定、可靠。     

图像区域标记和边沿检测的两步法

区域是边沿的互补物，综合考虑二者有利于获得更好的图像分割算法。提出一种基于马尔可夫神经网络的区域标记和边沿检测的两步法。输入图像首先通过一个单层马尔可夫神经网进行多类别的区域标记处理，然后将区域轮廓作为初值，送入另一个神经网络进行边沿检测和修整处理。介绍了一种利用直方图分析的类别初始标记方法。对仿真图像和真实图像的实验均给出了很好的效果。     

一种基于可测性的寄存器分配算法

提出了一种在高层次综合的寄存器分配过程中考虑可测性的算法，该算法在将一个调度好的CDFG（Control Data Flow Graph)的变量分配到相应的寄存器的过程中，通过对未能分配复用到输入、输出寄存器的变量进行可测性处理，达到提高设计可测性的目的，同时在进行可测性处理的时候，定义了CDFG的节点的可测性测度方法。     

一种面向VLIW指令压缩的寄存器分配算法

针对VLIW结构的指令压缩方法，通过对编译中间代码的深入分析和总结，提出一种改进的寄存器分配算法，该算法在线性扫描的基础上，对寄存器的选择添加约束条件，应用该算法能够使得目标代码中寄存器的编号尽量靠近，从而达到更好的压缩效果。     

“可编程序控制器及其应用”讲座：第十一讲 可编程序控制器的程序设计（二）

一、数据传送指令的构成数据传送执行数据组(或数据表)之间的数据存取。这类指令有: 寄存器→表 R→T(Registortn Table Move) 表→寄存器 T→R(Table to Registor Move) 表→表 T→T(Table to Table) 块传送 BLKM(Block to Movc) 先入指令 FIN(First IN) 先出指令 FOUT(First Out) 表检索 SRCH (Table SERCH) 读系统状态 STAT (get cntrollcr systemstatus) 利用这些指令,可以实现用继电器、定时器、计数器和四则运算等基本编程功能难以实现的复杂、高级的数据处理功能。所谓数据表,就是以连续16位字长编号的数据组。如输入寄存器(30×××)和保持寄存器(4××××)都是16位字长,每个寄存器即为一个数据表。开关量输入的一个数据表含有16个输入信号,即10001到10016,10017到10032…,每16点输入为一个数据表。输出信号也是这样,一个输出数据表含有16个输出线     

匹配条件不满足时线性系统未知输入观测器设计

针对一类不满足观测器匹配条件的线性系统,讨论了未知输入观测器设计方法.首先,为了突破观测器匹配条件的限制,提出了一种与未知输入相对阶无关的辅助输出构造方法.然后,把未知输入看作系统状态的一部分,将原系统转化为一个不含未知输入的增维线性描述系统.针对这样的系统转化,对一系列等价前提条件进行了详细的讨论.之后,针对该增维线性描述系统,构造Luenberger观测器来估计原系统的状态和未知输入.同时,借助于高阶滑模微分器,来估计辅助输出中的未知信号.最后,对一个单连杆柔性机械手模型进行了数值仿真,仿真结果表明了方法的有效性.     

功耗限制下RTL数据通路扫描测试调度方法

本文提出了利用RTL数据通路中的寄存器构造成移位扫描寄存器来测试功能模块的方法,同时提出一种改进的模块调度思想,实现在功耗限制下的测试调度。实验结果表明本文所给出的测试产生算法与调度算法对于由全加器和半加器构成的功能模块具有良好的性能和实用性。     

内建自测试中多输入特征寄存器的硬件开销的减少

在内建自测试中,针对随机向量测试,本文提出了一种通过输出信号分组压缩来减少多输入特征寄存器MISR的硬件开销的方法。该方法是在分析输出信号之间相关性的基础上,根据给定的MISR阶数构造具有最小相关度的输出信号集合组,以此来减少输出信号分组压缩时的故障覆盖率损失。该方法不需附加任何辅助电路。     

基于多扫描链的内建自测试技术中的测试向量生成

针对基于多扫描链的内建自测试技术,提出了一种测试向量生存方法。该方法用一个线性反馈移位寄存器（LFSR）作为伪随机测试向量生成器,同时给所有扫描链输入测试向量,并通过构造具有最小相关度的多扫描链克服扫描链间的相关性对故障覆盖率的影响。此外该方法经过模拟确定难测故障集,并针对这外难测故障集利用ATPG生成最小确定性测试向量集。最后丙依据得到的最小测试向量集来设计位改变逻辑电路,利用们改变逻辑电路控制改变扫描链上特定的值来实现对难测故障的检测,从而实现被测电路和故障完全检测。     

小波变换理论应用进展

本文介绍了小波变换理论,讨论了基本小波函数的选取准则和小波变换算法,分析了小波变换与人工智能等其它方法的结合方式和特点.通过介绍小波变换在信号瞬态分析、图像边沿检测、图像去噪、模式识别、数据压缩、分形信号分析等方面的应用实例,讨论了小波变换在处理非平稳信号和复杂图像时的优势.最后,对小波变换理论的发展及其应用前景作了描述.     

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。     

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.     

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.     

View-based model-driven architecture for enhancing maintainability of data access services

In modern service-oriented architectures, database access is done by a special type of services, the so-called data access services (DAS). Though, particularly in data-intensive applications, using and developing DAS are very common today, the link between the DAS and their implementation, e.g. a layer of data access objects (DAOs) encapsulating the database queries, still is not sufficiently elaborated, yet. As a result, as the number of DAS grows, finding the desired DAS for reuse and/or associated documentation can become an impossible task. In this paper we focus on bridging this gap between the DAS and their implementation by presenting a view-based, model-driven data access architecture (VMDA) managing models of the DAS, DAOs and database queries in a queryable manner. Our models support tailored views of different stakeholders and are scalable with all types of DAS implementations. In this paper we show that our view-based and model driven architecture approach can enhance software development productivity and maintainability by improving DAS documentation. Moreover, our VMDA opens a wide range of applications such as evaluating DAS usage for DAS performance optimization. Furthermore, we provide tool support and illustrate the applicability of our VMDA in a large-scale case study. Finally, we quantitatively prove that our approach performs with acceptable response times.     

A pragmatic multi-method investigation of discrepant technological events: Coping,attributions, and ‘accidental’ learning

Discrepant technological events or situations that entail a problem, a misunderstanding or a difficulty with the Information Technology (IT) being employed, are common in the workplace, and can lead to frustration and avoidance behaviors. Little is known, however, about how individuals cope with these events. This paper examines these events by using a multi-method pragmatic approach informed by coping theory. The results of two studies – a critical incident study and an experiment – serve to build and test, respectively, a theoretical model that posits that individuals use a variety of strategies when dealing with these events: they experience negative emotions, make external attributions, and adopt engagement coping strategies directed at solving the event, eventually switching to a disengagement coping strategy when they feel they have no control over the situation. Furthermore, users’ efforts may result in ‘accidental’ learning as they try to overcome the discrepant IT events through engagement coping. The paper ends with a discussion of the results in light of existing literature, future opportunities for research, and implications for practice.