一个分布式产品数据管理系统的研究与开发

ＰＤＭ系统是支持实现的数据集成的重要平台，文中介绍了一个分布式ＰＤＭ系统－ＭＰＤＭ．ＭＰＤＭ是基于多Ｃｌｉｅｎｔ／多Ｓｅｒｖｅｒ结构的。     

分布式容错计算机通讯系统的实现

本文叙述了按照分布式的动态更换通讯模式协议，简称ＤＤＣＣＰＰ（Ｄｉａｔｒｉｂｕｔｅｄ Ｄｙｎａｍｉｃ Ｃｈａｎｇｅ Ｃｏｍｍｕｎｉｃａｔｉｏｎ Ｐａｔｔｅｒｎ Ｐｒｏｔｏｃｏｌ）设计和实现的实用于分布式容错计算机的通讯系统，它为系统提供了可靠的硬核，实际运动结果令人满意。     

DOPS——分布式面向对象编程系统

ＤＯＰＳ是我们在Ｓｕｎ工作站网络中设计实现的分布式面向对象编程系统。目前包括并发面向对象编程语言ＣＣ＋＋和该语言在松散耦合分布式环境中的运行支撑系统ＤＲＴＳ。本文分别介绍ＣＣ＋＋和ＤＲＴＳ的设计与实现，最后给出检测结果。     

分布式工业测控网DMCN的协议设计

分布式工业测控网ＤＭＣＤ是一种带有令牌总线森林式复合拓朴结构局域网，多主站的加入改变单主站结构的复杂性，它以实时自动多主站控制，保证了ＤＭＣＮ网在一个或多个主站损坏的情况下网络的正常运行，同时，单个树之间也能共享资源，极大地提高了网络的性能，本文阐述ＤＭＣＮ网的拓朴结构和协议结构的设计思想，并重点分析了ＤＭＣＮ网的ＭＡＣ和ＬＬＣ子层协议。     

分布式多媒体协同编辑器DMCEdit

协同编辑器是分布式多媒体编著系统ＤＭＣＷ（ＤｉｓｔｒｉｂｕｔｅｄＭｕｌｔｉｍｅｄｉａＣｏｏｐｅｒａｔｉｖｅＷｒｉｔｉｎｇ）的核心部件，它集中体现了ＣＳＣＷ系统的要求和特色。本文介绍协同编辑器的体系结构、ＷＹＳＩＷＩＳ（ＷｈａｔＹｏｕＳｅｅＩＳＷｈａｔｌＳｅｅ）界面耦合、社会角色分工、共享／私有窗口操作和通信方式。     

基于OOP的一种分布式多任务智能系统的实现

作者在Ｎｏｖｅｌｌ４８６微机局部网络上，采用面向对象的程序设计方法（Ｏｂｊｅｃｔ Ｏｒｉｅｎｔｅｄ Ｐｒｏｇｒａｍｍｉｎｇ），用Ｃ＋＋语言编程实现了一种以知识处理为基础的分布式多任务智能系统，该系统在ＮｅｔｗｅｒｃＶ３．１及ＤＯＳ６．２２和ＵＣＤＯＳ５．０支持下模拟运行表明，系统所采用的知识表示方法、推理机制和控制策略可有效地进行协作问题的救解，有广阔和应用前景。     

一种分布式实时调试方法

ＤＲＴＤｅｂｕｇ是一种基于事件的调试模型，用于调试基于分布式操作系统核心 ＤＲＴＫ、分布式实时语言ＤＲＴＣ＋＋编写的分布式实时应用程序。本文介绍了ＤＲＴＤｅｂｕｇ的设计调试原理，阐述了分布式实时计算中的不确定性等问题的解决方法。     

分布式计算机系统

提出了一种具有安全性，高可靠性，高可用性的异构分布式计算机系统结构，讨论了ＨＤＣＳ各子系统的功能和组成。     

分布式控制系统的现状及趋势

分布式控制系统的现状及趋势俞文光ＴｈｅＣｏｎｄｉｔｉｏｎａｎｄＤｅｖｅｌｏｐｍｅｎｔｏｆＤｉｓｔｒｉｂｕｔｅｄＣｏｎｔｒｏｌＳｙｓｔｅｍ￥ＹｕＷｅｎｇｕａｎｇ在７０年代中期推出的分布式控制系统ＤＤＳ（ＤｉｓｔｒｉｂｕｔｅｄＣｏｎｔｒｏｌＳｙｓｔｅｍ）...     

无线传感器网络中一种能量高效的分布式分簇算法

提出了一种适用于无线传感器网络的能量高效的分布式分簇算法（ＥＥＤＣ）,该算法使具有较高剩余能量及距离基站较近的节点有更大的机会成为簇头．理论分析表明该算法通信开销较小,而且有效地均衡了节点的能量消耗．为了确保ＥＥＤＣ 的正确性、完整性和可靠性,利用形式化方法———着色网对其关键属性进行建模和分析．仿真结果表明,ＥＥＤＣ 有效地延长了网络生命周期,提高了网络的能耗效率．     

可擦写存储器及测试编程

目前，在微机系统及计算机应用领域，尚大量使用ＥＰＲＯＭ器件。严格 些器件的逻辑功能和直流、交流参数是十分必要的。文章首先粗略介绍了这类器件的一般工作原理、数据写入及擦除过程，然后，在多年实践的基础上，叙述了对ＥＰＲＯＭ进行智能编程、快速编程的方法及注意事项，最后，介绍了直流参数及交流参数的测试要点。     

基于NOW的对象式分布式程序设计语言NC++

提出了一个基于工作站网(networkofworkstations,简称NOW)的分布式程序设计语言NC++(NOWC++).它是DC++语言的扩充.NC++提供了一个完备的编程环境,包括NC++预编译器、图视编程界面、多目通信机制和测试系统.它完善了组管理机制和进程通信机制,提出了一个基于信度推理网络的分布共享内存(distributedsharedmemory,简称DSM)机制以管理C++公共变量.实践证明,NC++语言在确保编程方便性的前提下保证了分布式程序的性能.     

A DC programming approach for planning a multisensor multizone search for a target

In this paper, we consider a well-known problem in the general area of search theory: planning a multisensor in multizone search so as to maximize the probability of detection of a target under a given resource effort to be shared. We propose a new optimization model that is a nonlinear mixed 0–1 programming problem. This problem is then reformulated as a DC (Difference of Convex) functions program via an exact penalty technique. DC programming and DCA (DC algorithm) have been investigated for solving the resulting DC program. Numerical experiments demonstrate the efficiency and the superiority of the proposed algorithm in comparison with the existing method.     

New and efficient DCA based algorithms for minimum sum-of-squares clustering

The purpose of this paper is to develop new efficient approaches based on DC (Difference of Convex functions) programming and DCA (DC Algorithm) to perform clustering via minimum sum-of-squares Euclidean distance. We consider the two most widely used models for the so-called Minimum Sum-of-Squares Clustering (MSSC in short) that are a bilevel programming problem and a mixed integer program. Firstly, the mixed integer formulation of MSSC is carefully studied and is reformulated as a continuous optimization problem via a new result on exact penalty technique in DC programming. DCA is then investigated to the resulting problem. Secondly, we introduce a Gaussian kernel version of the bilevel programming formulation of MSSC, named GKMSSC. The GKMSSC problem is formulated as a DC program for which a simple and efficient DCA scheme is developed. A regularization technique is investigated for exploiting the nice effect of DC decomposition and a simple procedure for finding good starting points of DCA is developed. The proposed DCA schemes are original and very inexpensive because they amount to computing, at each iteration, the projection of points onto a simplex and/or onto a ball, and/or onto a box, which are all determined in the explicit form. Numerical results on real word datasets show the efficiency, the scalability of DCA and its great superiority with respect to k-means and kernel k-means, standard methods for clustering.     

Efficient DC programming approaches for the asymmetric eigenvalue complementarity problem

In this paper, we propose nonlinear programming (NLP) formulations and difference of convex functions (DC) programming approaches for the asymmetric eigenvalue complementarity problem (EiCP). The EiCP has a solution if and only if these NLP formulations have zero global optimal value. We reformulate the NLP formulations as DC programs which can be efficiently solved by a DC algorithm. Some preliminary numerical results illustrate the good performance of the proposed methods.     

A continuous DC programming approach for resource allocation in OFDMA/TDD wireless networks

The next generation broadband wireless networks deploys OFDM/OFDMA as the enabling technologies for broadband data transmission with QoS capabilities. Many optimization problems have arisen in the conception of such a network. This article studies an optimization problem in resource allocation. By using mathematical modeling technique we formulate the considered problem as a pure integer linear program. This problem is reformulated as a DC (Difference of Convex functions) program via an exact penalty technique. We then propose a continuous approach for its resolution. Our approach is based on DC programming and DCA (DC Algorithm). It works in a continuous domain, but provides integer solutions. To check globality of computed solutions, a global method combining DCA with a well adapted Branch-and-Bound (B&B) algorithm is investigated. Preliminary numerical results are reported to show the efficiency of the proposed method with respect to the standard Branch-and-Bound algorithm.     

混合编程在直流无刷电机控制系统中的应用

本文介绍了C语言和汇编语言的混合编程方法在直流无刷电机控制系统中的应用,重点介绍了变量定义及寄存器、数组、指针等的使用规则,C语言和汇编语言的相互调用方法,并给出了部分源程序。     

DCA for online prediction with expert advice

Neural Computing and Applications - We investigate DC (Difference of Convex functions) programming and DCA (DC Algorithm) for a class of online learning techniques, namely prediction with expert...     

基于PID算法的直流电机PWM调速控制器设计

为提高对直流伺服电机转速的控制精度,将控制器硬件电路设计成闭环控制系统,通过位置传感器采样获取伺服电机转速并反馈给单片机系统,引入基于PID控制的算法对单片机进行编程控制,设计了一款能通过反馈控制自动修正直流电机转速的调速控制器,文中给出了控制器的硬件电路设计方法和系统软件的编程算法。该控制器具有成本低、控制精度高、调速范围宽、响应速度快等特点,通过简单硬件接口就能将其嵌入到的各种小功率直流电机控制产品中加以应用。     

基于Delphi与OpenGL的三维图形环境的构建

OpenGL实际上是一种图形与硬件的接口，是一个强大的3D图形库。Delphi是Windows平台下最好的开发工具之一。介绍了OpenGL绘图与Windows编程的联系：阐述了实现Delphi和OpenGL图形接口主要的工作是初始化OpenGL、设置像素格式、关联RC（RenderingContexts）和DC（DeviceContexts），从而实现与OpenGL在Windows操作系统下的图形接口，以构建三维图形开发环境。