VHDL与电子自动化

随着电子设计自动化（ＥＤＡ）时代的到来，传统的硬件设计方法已经无法满足人们的要求了，ＶＨＤＬ语言作为一种高级硬件描述语言，由于它能以形式化的方式描述数字系统，从而大部分繁琐的工作可以由计算机来完成，而设计师能专注于整个系统的设计。ＶＨＤＬ的出现为电子设计自动化（ＥＤＡ）的发展打下了坚实的基础，也给硬件设计领域带来一场革新。本文就此介绍了ＶＨＤＬ语言的基本构成和语句，及使用ＶＨＤＬ语言设计的优点。     

硬件描述语言VHDL的表述特点及其综合过程

ＶＨＤＬ是一种具备形式化，层次化和规范化的硬件描述语言。它能针对设计实体的多方面特性给出了其不同层次上的表述方式；结构描述，数据流描述和行为描述。本文介绍了ＶＨＤＬ的表述特点及其综合过程。     

Verilog HDL与逻辑系统设计

ＶｅｒｉｌｏｇＨＤＬ与逻辑系统设计北京航空航天大学ＥＤＡ实验室夏宇闻随着计算机和半导体工艺技术的发展，数字逻辑电路的设计正悄悄地进行着一场重大的革命。这场革命的核心是采用硬件描述语言（ＶＨＤＬ或ＶｅｉｌｏｇＨＤＬ）来设计复杂的数字逻辑系统。早在七十年...     

VHDL语言行为描述划分的研究与实现

硬件描述语言行为级划分的处理对象是行为级的硬件描述，其结果可以用来指导综合中数据通路的设计实现及后续综合。本文研究ＶＨＤＬ语言行为描述划分的内容和系统设计方法，提出了一种类层次可变权的ＶＨＤＬ语言行为划分算法，该算法将单级层次划分算法与多级层次划分算的思想统一到一种算法中；针对行为划分的目标特点本文在划分因素评估中提出了规模因素的思想。     

VHDL语言中断言语句及其综合方法研究

国内外学者普遍认为，硬件描述语言ＶＨＤＬ中断言语句是面向模拟的，其不能综合或不要综合，综合系统应忽略或不支持。本文给出了相反的论点：ＶＨＤＬ中断言语句应该综合，其中限制条件的补表达式可作为随意条件用于综合时化简。文中论述了综合断言语句的合理性，必要性和方便性，并给出了综合并行和串行断言语句的方法。     

行为驱动的VLSI设计方法

本文提出在ＶｅｒｉｌｏｇＨＤＬ硬件描述语言和Ｖｅｒｉｌｏｇ－ＸＬ模拟器环境下，实现行为驱动的ＶＬＳＩ硬件结构设计方法，从而生成寄存器传输级的数据通道和控制通道，给出了智能机械手实时控制主用处理器结构设计实例。     

VHDL——标准化的硬件设计语言

本文介绍了用ＶＨＤＬ语言来描述硬件模型的方法，结合实例说明这种高级硬件设计语言在逻辑设计中的灵活性和可移植性，并指出ＶＨＤＬ将推动逻辑设计的标准化     

标准硬件描述语言VHDL

ＶＨＤＬ（ＶＨＳＩＣ Ｈａｒｄｗａｒｅ Ｄｅｓｃｉｐｔｉｏｎ Ｌａｎｇｕａｇｅ，ＶＨＳＩＣ硬件描述文）作为ＩＥＥＥ标准设计语言，是电子ＣＡＤ技术发展的重要里程碑。ＶＨＤＬ语言正在逐步为广大电子设计师了解和掌握。本文主要介绍了ＶＨＤＬ语言的特点、构件和描述风格。     

VLSI设计仿真系统分析编译器的研制

仿真在国内外都是关键攻关项目，而研究仿真的办法基本上都是用某种语言对问题进行描述，然后编译，根据需要产生仿真结果。但问题的描述语言品种很多，如果针对每种语言都研制其编译器，那么花费许多的人力、财力、不划算。因此，本文介绍一种用于ＶＬＳＩ设计仿真中的硬件描述语言（ＨＤＬ）到Ｃ语言的转换实例，其设计思想及实现办法适于各类问题描述语言分析编译器的研制     

V2C＋＋——一个用C＋＋实现的VHDL翻译型模拟器

由于面向对象的Ｃ＋＋语言更贴近描述硬件对象的ＶＨＤＬ语言Ｃ＋＋实现翻译型ＶＨＤＬ模拟器，并利用Ｃ＋＋本身的编译器的优化功能，可以得到运行的时间和空间方面效率较高的ＶＨＤＬ模拟器，Ｖ２Ｃ＋＋的原型设计和初步实践表明，用Ｃ＋＋实现ＶＨＤＬ翻译性模拟器比解释性模拟器具有较高效率，利于较大规模的电路的模拟。     

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。     

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。