Protel原理图的C+ +重现方法研究

介绍了一种使用C+ +语言重新绘制Protel原理图的方法.文章分析了原理图文件及其导出文件的格式,由此确定了具体的转换思路,并提供了程序流程和一个简单的转换效果.该方法可以推广到使用其他语言编写的软件中.     

基于FPGA的高速A/D转换控制器设计

采用FPGA器件EP1C12Q240C8实现对高速A/D转换芯片ADC08200的实时采样控制,解决了传统方法的速度问题。使用VHDL语言采用自顶向下的设计方法编写出源程序;结合FIFO存储器的设计实现了高速A/D采集转换和转换后的数据存储,并给出了采样存储电路原理图。数据处理可通过与SoPC技术结合实现。     

一种将位图文件转换为PCB文件格式的方法

本文介绍了电路设计软件包Protel产生的PCB文件的格式,并在此基础上给出了一种使用C语言将位图文件转换为制作印刷电路板所需的PCB文件的实用方法。     

ASP．NET2．0中利用C#实现DBF文件向MDB文件的转换

本文以C#为设计语言,应用ADO．NET技术,并且综合运用DataAdapter与DataSet,完成ASP．NET下DBF文件向MDB文件的转换,这样在应用系统中无需借助第三方软件的转换就可以直接使用DBF文件,解决了以MDB文件为数据源的应用系统如何直接使用DBF文件的问题。     

ASP.NET2.0中利用C#实现DBF文件向MDB文件的转换

本文以C#为设计语言,应用ADO.NET技术,并且综合运用DataAdapter与DataSet,完成ASP.NET下DBF文件向MDB文件的转换,这样在应用系统中无需借助第三方软件的转换就可以直接使用DBF文件,解决了以MDB文件为数据源的应用系统如何直接使用DBF文件的问题。     

微软.NET框架下提取在线Web数据的方法

本文通过一个在线Web数据提取的实例,介绍了在微软的.NET框架下,使用SgmlReader将HTML文件转换为XHTML,并使用XML的XPath语言和XSLT转换技术提取在线Web数据的方法,文中还给出了核心程序的部分代码.     

Protel原理图文件的结构分析及其在Widows中的显示和截取

一、前言ProtelACLELTechnologiesInc公司推出的电路辅助设计软件，自进入中国以来，得到了广泛的应用。它的元件库比较齐全，包括了各种常用的IC及分立器件，而且可以任意扩充其中的元件。在使用Windows中的文档编辑系统时，若能从Protel原理图文件中直接得到电路图，则可以大大减少用户的工作量。下面，我们对Protel原理图文件结。构进行分析，然后讨论在Windows中利用剪贴板显示和截取原理图。二、原理图文件结构Protel的原理图文件以son为后缀，保存了电路中的所有信息，包括：原理图尺寸；原理图各个部件的坐标，点阵信息，文字…     

高级语言程序和dBASE数据库直接接口的方法

前言dBASEⅡ/Ⅲ的数据库文件(DBF)若需被其他高级语言程序使用以及修改,通常的方法是在dBASE的控制下,将数据库文件拷贝生成一个文本文件(等长记录的顺序文件,后缀名是TXT)。这无疑要增加转换时间和额外的磁盘空间。高级语言程序处理数据后,若需把结果送     

基于SNMP的MIB库转化成C文件的实现

网络管理日益重要,SNMP以其简单、灵活的特点而得到广泛应用。MIB库是网络管理中的资源以及属性的集合,是网管的核心,要访问MIB库,必须将其转换成C语言。MIB库转换成C文件,先要按照一定的语法格式编写MIB文件,将新编写的MIB文件放入MIB库中,然后根据是转换简单变量还是表变量使用NET-SNMP源码包自带的模板转换。经实验证明,这种方法能够简单快速地将MIB文件转换成C文件,并且转换后的C文件代码格式统一,经过少量的修改,就可以重新编译到SNMP源码包中使用。     

数字逻辑电路与语言相结合的教学方法探索

为了改进数字逻辑电路教学方法以适应电子技术迅猛发展的需要,探索了新的数字逻辑电路教学方法,这就是数字电路与语言相结合.比较电路原理图输入方法和Verilog语言输入方法在逻辑电路设计中的使用.     

Combining a monad and a comonad

We give a systematic treatment of distributivity for a monad and a comonad as arises in giving category theoretic accounts of operational and denotational semantics, and in giving an intensional denotational semantics. We do this axiomatically, in terms of a monad and a comonad in a 2-category, giving accounts of the Eilenberg–Moore and Kleisli constructions. We analyse the eight possible relationships, deducing that two pairs are isomorphic, but that the other pairs are all distinct. We develop those 2-categorical definitions necessary to support this analysis.     

Splitting a configuration in a simplex

This paper presents a new method of partition, named-splitting, of a point set ind-dimensional space. Given a pointG in ad-dimensional simplexT, T(G;i) is the subsimplex spanned by G and the ith facet ofT. LetS be a set ofn points inT, and let be a sequence of nonnegative integers ₁, ..., n_d+1 satisfying _i=1 ^d+1 ₁=n The-splitter of (T, S) is a pointG inT such thatT(G;i) contains at least _i points ofS in its closure for everyi=1, 2, ...,d + 1. The associated dissection is the re-splitting.The existence of a-splitting is shown for any (T, S) and, and two efficient algorithms for finding such a splitting are given. One runs inO(d²n logn + d³n) time, and the other runs inO(n) time if the dimensiond can be considered as a constant. Applications of re-splitting to mesh generation, polygonal-tour generation, and a combinatorial assignment problem are given.     

On a nonlinear problem of a sequential control with a parameter

The problem of evasion of a group of moving points from a nonlinear controlled object, whose goal is consecutively approach these points in a prescribed order, is analyzed. The movement of each point is defined uniquely by a scalar parameter chosen at the initial time instant. The controlled object minimizes a certain cost function, and the group of the points, acting cooperatively, maximize this cost function by choosing the parameters. Necessary optimality conditions for parameters are obtained. A model problem of an evasion of moving points from a vehicle is solved.     

Three-Link Mechanism as a Model of a Person on a Swing

Journal of Computer and Systems Sciences International - We model movements of a person swinging on a swing. We consider a flat three-link hinged mechanism as the main mechanical model of the...     

Not a castaway but a stowaway

A portable keyboard that's no larger than my phone, that's theiGo Stowaway.     

Transposing a matrix on a vector computer

There are many published algorithms for transposing a rectangular matrix in place, however none of these are suited to a vector processor. In this work we describe four methods and compare their speed and memory requirements to copying the matrix into workspace then back again in transposed order.     

Locating a tree in a phylogenetic network

Phylogenetic trees and networks are leaf-labelled graphs that are used to describe evolutionary histories of species. The Tree Containment problem asks whether a given phylogenetic tree is embedded in a given phylogenetic network. Given a phylogenetic network and a cluster of species, the Cluster Containment problem asks whether the given cluster is a cluster of some phylogenetic tree embedded in the network. Both problems are known to be NP-complete in general. In this article, we consider the restriction of these problems to several well-studied classes of phylogenetic networks. We show that Tree Containment is polynomial-time solvable for normal networks, for binary tree-child networks, and for level-k networks. On the other hand, we show that, even for tree-sibling, time-consistent, regular networks, both Tree Containment and Cluster Containment remain NP-complete.     

Linking a CYBER76 to a 3600

In mid-1973, the Division of Computing Research, CSIKO, took delivery of a Control Data CVBER76 computer, which acts as the primary processing power of the CSIRO computer network (CSIRONET), replacing the Control Data 3600. The 3600, running under the DAD operating system, has been retained as a ‘front-end’ to the CYBER76 and continues to support the following functions:

• 1 An interactive system allowing both editing and CYBER76 job submission
• 2 Input of job files centrally from 3600 input devices, remotely from CSIRONET devices, or from interactive console users, and output of results similarly
• 3 A permanent file (document) system, with tape archiving

This paper describes the linking of the CYBER76 to the 3600. Software for a CYBER76 PPU has been written and some changes to the 3600 and CYBER76 operating systems have been required.