用API解决VB报表纸张设置问题

本文介绍了一个用WindowsAPI解决VB报表纸张设置问题的软件,探讨了其调用WindowsAPI思路和一些技术细节,给出了具体的实现方法和相关程序,有较好的实用价值。     

利用API接口实现VB3.0通讯程序设计

本文结合了一个应用通讯实例对在Windows3．x下用应用编程接口API来实现通讯功能用了深入的探讨，从VB3．0与API函授接口的角度详细讨论了AP方式实现通讯的特点与适用环境。     

利用API函数改变窗体形状

在 Ｖｉｓｕａｌ　Ｂａｓｉｃ程序设计中,我们通常所设计的窗体都是标准的矩形。那么能否使窗体的这一古老的面孔发生变化,给人以新鲜的感觉呢？其实,通过调用Ｗｉｎｄｏｗｓ的ＡＰＩ函数,便可轻而易举的实现一些你所要的窗体形状,比如,圆形、三角形、菱形、Ｔ形、圆角矩形等。 所谓ＡＰＩ就是“应用程序接口”（Ａｐｐｌｉｃａｔｉｏｎ　ＰｒｏｇｒａｍｍｉｎｇＩｎｔｅｒｆａｃｅ）,是一些用Ｃ语言编写,由操作系统自身调用的函数。用来改变窗体形状的ＡＰＩ函数主要有ＳｅｔＷｉｎｄｏｗＲｇｎ、ＣｒｅａｔｅＥｌｌｌｉｐｔｉｃＲ…     

在VB中利用API实现多进程数据交换的方法

在程序设计中有时需要在多个进程间进行数据交换。用VB编程实现这个功能时,除了可使用数据文件实现之外(存在许多不足),还可使用内存映射对象实现(后者要比前者效率高的多)。由于VB自己没有创建内存映射的函数,因此需要调用Windows API函数CreateFileMapping、MapViewOfFile和OpenFileMapping来实现该功能。以下结合具体例子,分析介绍如何实现一个进程向内存发送数据,而另一进程从内存读取数据的具体过程。     

利用OLE自动化和Excel实现VB的复杂统计报表

ＶＢ５．０进行客户机／服务器前端开发中利用ＯＬＥ自动化和Ｅｘｃｅｌ９７实现复杂统计报表的一般方法，给出了开发的配电管理ＧＩＳ（地理信息系统）中创建统计报表的示例，并进一步对有关问题进行了讨论。     

利用VBA及OLE自动化技术实现OFFICE环境下VB数据报表生成

本文结合详尽的程序代码，系统介绍了VB数据库报表输出的几种常用方式，并就其特点优劣进行了简单评述。     

巧用API函数在VB中实现特殊效果的窗体

０引言ＡＰＩ函数是一组主要用Ｃ和Ｐａｓｃａｌ语言编写的函数,绝大多数可以在ＶＢ中调用。ＡＰＩ函数并不复杂,也不象许多ＶＢ编程人员想象的那么神秘。只有灵活应用ＡＰＩ函数,才能使ＶＢ变得“无所不能”,让开发的应用程序更加充满活力。下面介绍ＡＰＩ函数的调用以及其在窗体中的应用。１　ＡＰＩ函数的调用ＡＰＩ函数与普通ＶＢ函数的唯一差别是：ＡＰＩ函数要声明后才能使用。实际上只要告诉ＶＢＡＰＩ函数所用的ＤＬＬ文件及其所需的参数,即可象使用普通ＶＢ函数一样使用ＡＰＩ函数。ＡＰＩ函数可以按类似下面的格式声明（注意…     

Delphi动态报表的设计实现

介绍Delphi环境中利用Delphi自带控件生成动态报表以及通过Excel自动化技术增强Dephi动态报表处理功能的方法，该方法灵活，简便，实用性强。     

用数据报表设计器创建报表

数据环境设计器（Ｄａｔａ　Ｅｎｖｉｒｏｎｍｅｎｔ　ｄｅｓｉｇｎｅｒ）与数据报表设计器（Ｄａｔａ　Ｒｅｐｏｒｔ　ｄｅｓｉｇｎｅｒ　）均是Ｖｉｓｕａｌ　Ｂａｓｉｃ６．０的新增功能,它们的出现大大增强了Ｖｉｓｕａ　Ｂａｓｉｃ　处理数据的能力。在以往的Ｖｉｓｕａ　Ｂａｓｉｃ　版本中,制作报表都是通过第三方产品来完成并通过Ａｃｔｉ　ｖｅＸ控件输出的。这两种设计器的出现,使得Ｖｉｓｕａｌ　Ｂａｓｉｃ　程序员再也不用考虑选择一个什么样的第三方工具设计报表了,所有的设计全部在Ｖｉｓｕａｌ　Ｂａｓｉｃ　内部完成,…     

VB中结合Excel进行报表制作及报表的Internet传送

介绍了在VB中如何结合Excel进行MIS系统的报表制作,并利用MAPI控件,把生成的Excel报表文件作为邮件附件在Internet上传送,以简单、经有效的方式实现了跨地企业报表的分布处理。     

Markov chain models of a telephone call center with call blending

Motivated by a Bell Canada call center operating in blend mode, we consider a system with two types of traffic and two types of agents. Outbound calls are served only by blend agents, whereas inbound calls can be served by either inbound-only or blend agents. Inbound callers may balk or abandon. There are several performance measures of interest, including the rate of outbound calls and the proportion of inbound calls waiting more than some fixed number of seconds. We present a collection of continuous-time Markov chain (CTMC) models which capture many real-world characteristics while maintaining parsimony that results in fast computation. We discuss and explore the tradeoffs between model fidelity and efficacy and compare our different CTMC models with a realistic simulation model of a Bell Canada call center, used as a benchmark.     

Distributed scheduling to support a call center: A cooperative multiagent approach

This article describes a multiagent system architecture to increase the value of 24-hour-a day call center service. This system supports call centers in making appointments with clients on the basis ofknowledge ofemployees and their schedules. Relevant activities are scheduled for employees in preparation ofsuch appointments. The multiagent system architecture is based on principled design, using the compositional development method for multiagent systems DESIRE. To schedule procedures in which more than one employee is involved, each employee is represented by its own personal assistant agent, and a work manager agent coordinates the schedules of the personal assistant agents and clients through the call center. The multiagent system architecture has been applied to the banking domain, in cooperation with and partially funded by the Rabobank.     

Applications of maximum queue lengths to call center management

This paper deals with the distribution of the maximum queue length in two-dimensional Markov models. In this framework, two typical assumptions are: (1) the stationary regime, and (2) the system homogeneity (i.e., homogeneity of the underlying infinitesimal generator). In the absence of these assumptions, the computation of the stationary queue length distribution becomes extremely intricate or, even, intractable. The use of maximum queue lengths provides an alternative queueing measure overcoming these problems. We apply our results to some problems arising from call center management.     

Performability evaluation of emergency call center

Emergency call centers serve people in utmost circumstances; hence they should be highly dependable. Availability and performance are key aspects in call centers. Architectural models, service policies, and redundancies are attributes for defining and evaluating the overall operation of such systems. In this work, we performed the performability evaluation of an important emergency call center located in a large city in Brazil. The results showed that the system’s downtime is considered high, so, we proposed a new architecture to improve the system’s performability. The results obtained in this paper can be used to provide support for decisions on interventions in the emergency call center to improve its performability. It is expected that the models presented in this paper will be useful in a variety of emergency call centers.     

A normal copula model for the arrival process in a call center

We propose and examine a probabilistic model for the multivariate distribution of the number of calls in each period of the day (e.g., 15 or 30 min) in a call center, where the marginal distribution of the number of calls in any given period is arbitrary, and the dependence between the periods is modeled via a normal copula. Conditional on the number of calls in a period, their arrival times are independent and uniformly distributed over the period. This type of model has the advantage of being simple and reasonably flexible, and can match the correlations between the arrival counts in different periods much better than previously proposed models. For the situation where the number of periods is large, so the number of correlations to estimate can be excessive, we propose simple parametric forms for the correlations, defined as functions of the time lag between the periods. We test our proposed models on three data sets taken from real‐life call centers and compare their goodness of fit to the best previously proposed methods that we know. In the three cases, the new models provide a much better match of the correlations and coefficients of variation of the arrival counts in individual periods.     

大型呼叫中心话务量预测

为进行呼叫中心的坐席数估计和后续的排班工作,分析了历史话务量数据的特点,总结出影响大型呼叫中心话务量的因素,并用这些影响因素的不同组合来预测话务量,通过结果的对比分析得出相对最优的话务量预测模型.在此模型的基础上分别采用BP神经网络算法和支持向量机算法(LS-SVM)对话务量进行了预测,通过分析和比较结果表明,BP神经网络比支持向量机算法更适合对大型呼叫中心话务量的预测.     

数据仓库技术在呼叫中心中的应用

针对现有的呼叫中心中存在历史数据量大、分析和处理数据能力不足、导致企业决策缺乏数据支持的问题,在对呼叫中心和数据仓库技术研究的基础上,结合呼叫中心的呼叫管理系统的特点,设计了呼叫中心数据仓库的体系结构,详细论述了对该数据仓库的体系结构、逻辑模型、物理模型以及联机分析处理（OLAP）系统的设计和具体实现方案。     

带柔性休息时间的多技能呼叫中心班次设计

几乎所有的大型呼叫中心都提供7×24服务,其必然面对着一天内客户需求大幅度的波动,为了更好匹配客户需求与人力资源供给,班次设计尤为重要。由于一天内的工作负荷极不均衡,呼叫中心的班次设计远比传统概念上的“早中晚三班”复杂,其中最困难的是班次中休息时间的合理分配。提出了两阶段的班次设计思路,在第一阶段确定了班次的个数与起止时间,第二阶段在连续的班次中加入根据当天需求柔性可变的休息时间,并将人力需求由时刻转化为班次,缩小后续人员指派问题的规模。通过算例实验证明二阶段的班次设计模型能得到可行解,并分析了其存在的问题。     

A problem in computer algebra connected with solution of linear differential and difference equations

Given an algorithmU _L that finds all the solutions of linear homogeneous differential and difference equations in some linear space L, we describe two algorithms that construct all solutions whose high order derivatives (or differences) are in L.Translated from Kibernetika, No. 2, pp. 30–37, March–April, 1991.