Browser／Server与Client／Server结构的分析与比较

本文介绍Ｂｒｏｗｓｅｒ／Ｓｅｒｖｅｒ与Ｃｌｉｅｎｔ／Ｓｅｒｖｅｒ结构,分别对这两种结构进行分析与比较,并阐明各自的优、缺点,结论为三层的Ｂｒｏｗｓｅｒ／Ｓｅｒｖｅｒ结构是未来系统的发展方向。     

一种提高V／F方式A／D转换速率的新颖设计方法

一种提高Ｖ／Ｆ方式Ａ／Ｄ转换速率的新颖设计方法魏立峰，刘晓梅ＡＮｅｗＤｅｓｉｇｎＭｅｔｈｏｄｏｆＲａｉｓｉｎｇｔｈｅＡ／ＤＣｏｎｖｅｒｓｉｏｎＲａｔｅｏｆＶ／ＦＣｏｎｖｅｒｔｅｒ￥ＷｅｉＬｉｆｅｎｇ；ＬｉｕＸｉａｏｍｅｉ以Ｖ／Ｆ变换器作为Ａ／Ｄ转换器...     

Visual FoxPro的客户／服务器应用程序开发

Ｖｉｓｕａｌ ＦｏｘＰｒｏ作为客户／服务器结构的前端，提供了大量访问服务器数据的途径。本文讨论了如何利用Ｖｉｓｕａｌ ＦｏｘＰｒｏ远程视图和ＳＱＬ ｐａｓｓ－ｔｈｒｏｕｇｈ（ＳＰＴ）技术实现客户／服务器应用程序的开发。     

轻松升级Gb／s以太网

本文对Ｇｂ／ｓ以太网的技术背景，与ＡＴＭ技术的比较、应用方式等内容作介绍，同时介绍目前市场中的主要Ｇｂ／ｓ以太网解决方案。     

客户／服务器体系结构

客户／服务器技术是计算机信息技术的一大突破。ｃｌｉｅｎｔ／ｓｅｒｖｅｒ系统集成将为信息系统的开发建设带来革命性的变化。本文介绍了客户／服务器体系结构有系统集成的概念及总体情况。     

一种新颖的B／S模式实现方法

采用Ｂ／Ｓ（浏览器／服务器）模式是目前应用系统设计开发的主要特征,采用Ｓｙｂａｓｅ、ＰｏｗｅｒＢｕｉｌｄｅｒ,Ｎｏｔｅｓ共同实现Ｂ／Ｓ模式能够满足各种应用功能要求,开发效率高,便于原有Ｃ／Ｓ（客户／服务器）模式应用的Ｂ／Ｓ模式应用平滑过渡,是一种经济适用的Ｂ／Ｓ模式实现新颖方法。     

利用Domino／Notes开发基于Web的多媒体数据库

介绍了利用关系数据库开发Ｗｅｂ应用系统的不足及Ｄｏｍｉｎｏ／Ｎｏｔｅｓ的优良及其Ｗｅｂ特性,结合开发基于Ｗｅｂ的多媒体数据库提出了利用Ｄｏｍｉｎｏ／Ｎｏｔｅｓ建立多媒体数据库的一些编程技巧。     

Visual FoxPro的客户／服务器应用程序开发

Ｖｉｓｕａｌ ＦｏｘＰｒｏ作为客户／服务器结构的前端，包含了大量访问服务器数据的途径。本文讨论了如何利用Ｖｉｓｕａｌ ＦｏｘＰｒｏ远程视图和ＳＱＬｐａｓｓ－ｔｈｒｏｕｇｈ（ＳＰＴ）技术实现客户／服务器应用程序的开发。     

Windows95／NT下设备驱动程序的编制

本文简要分析了Ｗｉｎｄｏｗｓ９５／ＮＴ下设备驱动程序编制的原理,提出了一种在Ｗｉｎｄｏｗｓ９５／ＮＴ下设备驱动程序的编制方法,并以ＳＧ３数字化仪为例,编写了Ｗｉｎｄｏｗｓ９５／ＮＴ下的串口通信驱动程序。     

Lotus Notes／Domino访问Oracle数据库的一种方法

本文介绍Ｌｏｔｕｓ Ｎｏｔｅｓ／Ｄｏｍｉｎｏ通过ＯＤＢＣ实现对Ｏｒａｃｌｅ数据库访问的具体方法，该方法也可用于实现Ｌｏｔｕｓ Ｎｏｔｅｓ／Ｄｏｍｉｎｏ对其它关系式数据库的访问。     

M/G/c/K blocking probability models and system performance

An exact solution for the M/G/c/K model is only possible for special cases, such as exponential service, a single server, or no waiting room at all. Instead of basing the approximation on an infinite capacity queue as is often the case, an approximation based on a closed-form expression derivable from the finite capacity exponential queue is presented. Properties of the closed-form expression along with its use in approximating the blocking probability of M/G/c/K systems are discussed. Extensive experiments are provided to test and verify the efficacy of our approximate results.     

一种新的Web数据库系统结构——B／W／D／C四层结构

针对传统Web数据库三层体系结构不足,综合B／W系统与C/S系统的优点,本文提出了一种新的Web数据库系统的B/W／D／C四层体系结构。并给出对于四层体系结构在物理上的精简实现。     

Asymptotic analysis and simple approximation of the loss probability of the GI/M/c/K queue

We consider the GI^X/M/c/K queues with partial rejection or total rejection, and find an asymptotic behavior of loss probability of the GI^X/M/c/K queue as K tends to infinity. The asymptotic loss probability is expressed only in terms of the roots of the characteristic equation and the boundary probabilities of the corresponding GI^X/M/c queue. Numerical examples show that the asymptotic loss probability is a quite accurate approximation for the loss probability of the GI^X/M/c/K queue even when the system capacity K is moderate.     

AChE/PAMAM-Au/CNTs/GC传感器用于有机磷农药检测的研究

该文制备了一种多层AChE/PAMAM-Au/CNTs/GC乙酰胆碱酯酶的酶抑制电流型传感器应用于有机磷农药的检测,主要利用碳纳米管良好的导电性和吸附性,以及PAMAM(G4)-Au树枝状复合物特殊的结构及导电性能,利用有机磷农药对乙酰且日碱酯酶的抑制作用,以硫代乙酰胆碱(ATCh)为底物,实现了对有机磷农约的检测.实验表明,该方法快速简单,线性范围宽,灵敏度高.固定在传感器上的乙酰胆碱酯酶具有良好的酶动力学响应,其米氏常数(KMapp)为1.66 mmol/L.对有机磷农药呋喃丹的最低检测限达到4.0 nmol/L.     

AM/FM/GIS应用系统建设中若干问题的探讨

在进行多项AM／FM／GIS应用系统建设实践和对AM／FM／GIS的深入研究的基础上,阐述了AM／FM／GIS的特点,指出了当前AM／FM／GIS建设过程中存在的一系列问题,并从AM／FM／GIS标准,平台建设,模型集成,知识与规则的应用,多层体系结构,分布式计算等几个方面对AM／FM／GIS进行了较为详细的探讨,提出了解决相关问题的思路。     

Scilab/Scicos在硬件/软件联合设计中的应用

从介绍电子设计自动化中的软硬件联合设计入手，阐述了联合设计的必要性和重要意义，并提出了法国INRIA开发的科学教育处软件Scilab/Scicos扩充为软硬件联合设计工具的构想。随后，详细论述了将Sclilab/Scicos应用于描述电子电路设计时所遇到的问题及解决的方法。对于所需模块的扩充以及编译器的构造也给出了说明。     

Complex random sample scheduling and its application to an N/M/F/Fmax problem

“Complex Random Sample Scheduling(CRSS)” was proposed in this paper as an efficient heuristic method for solving any permutation scheduling problems. To show the effectiveness of the proposed CRSS, it was applied to an N-job, M-machine, permutation flowshop scheduling problem to minimize makespan, N/M/F/F_max. Numerical experiments made it clear that the proposed CRSS provides a schedule very close to the near-optimal schedule obtained by the existing promising heuristic methods such as taboo search and simulated annealing, within less computation time than these heuristic methods.     

On the M/Ck/1 queue

We obtain the exact analytic expression of the probability distribution of the number of units in a single server queue with Poisson arrivals and Coxian service time distribution (notated as M/C_k/1). A recursive procedure for calculating this probability distribution is given. The well-known queues M/E_k/1 and M/D/1 are re-derived as special cases of the M/C_k/1 queue. Finally, the cases of M/C₂/1 and M/C₃/1 are fully worked out.     

基于制造业CAX/PDM/ERP集成研究

分析了制造业内部CAD／CAM／CAPP与企业ERP的关联、因特网与企业内部网之间的关系,对如何利用PDM作为中间桥梁,将企业CAX系统与企业ERP集成的方法进行了论述与研究,构筑了一种基于制造业信息集成系统的模型。基于CAX／PDM／ERP集成模型的应用研究,目的在于提高制造业信息系统的集成深度与广度,为企业的发展与竞争提供充实的信息化基础保证。     

Randomized control of T-policy for an M/G/1 system

We study an M/G/1 queueing system with a server that can be switched on and off. The server can take a vacation time T after the system becomes empty. In this paper, we investigate a randomized policy to control a server with which, when the system is empty, the server can be switched off with probability p and take a vacation or left on with probability (1 − p) and continue to serve the arriving customers. For this system, we consider the operating cost and the holding cost where the operating cost consists of the system running and switching costs (start up and shut down costs). We describe the structure and characteristics of this policy and solve a constrained problem to minimize the average operating cost per unit time under the constraint for the holding cost per unit time.