软PLC在风力发电机控制系统中的应用

软PLC(可编程控制器)是一种基于PC机的新的控制技术,它与传统的PLC相比,性价比高,而且为用户提供更多的开放性.本文阐述软PLC在风力发电机控制系统中的应用,介绍了该控制系统的构成、硬件设计和软件设计流程.     

Pick a Number … Any Number?

A recent classroom revelation caused us to reconsider the adequacy of the instructions offered in our textbooks for one of our most elementary quantitative methods. Specifically, we found that many students were mystified concerning how to pick an initial objective function value when plotting an isoprofit line in order to graphically solve a linear programming problem. We observed that this seemingly insignificant issue was causing a surprising amount of wasted time, confusion, and even anxiety. Our experience indicated that students do not necessarily possess any consistent intuition for choosing an appropriate initial value. We confirmed this perception through informal experimentation. We reviewed several textbooks and found that most simply do not bother to address this issue. Therefore, we devised a simple, comprehensible method which we have taught our students to resolve or avoid this problem. Although we quickly found the method to be helpful for many students, we conducted an experiment to formally measure its effect.     

开设信息技术课程中的探索和拓展

信息技术课程的开设要注重学生安全的必要性,在实际教学中注意学生的不同年龄阶段的身心特点,和谐、创新开好课程,不断提高教学质量,拓展信息技术知识,培养学生的编程思维能力,加强拓展设备用途,促进教育资源充分应用。     

对面向对象程序设计的探讨

认真区分面向对象程序设计与面向过程程序设计,了解面向对象程序设计的特征,列出了面向对象程序设计的优点.     

Analysis of Students’ learning of computer programming in a computer laboratory context

ABSTRACT

Previous research shows that many students find it difficult to learn computer programming. To learn computer programming includes both gaining theoretical understanding and learning to develop programmes in practice. To this end, teachers commonly design programming exercises for the students in the computer laboratory. To be able to improve the process of designing such exercises, there is a need of a more detailed understanding of the interaction between learning of theory and learning of practice in laboratory sessions. In this paper, an approach for investigating this interaction is proposed. Theoretically, the approach is based on phenomenography and variation theory. To illustrate the approach, it is demonstrated in detail how it was applied to a small but rich case of empirical data from a computer laboratory session. The main result presented here is the new approach for analysing data. In addition, the results of the case study shed preliminary light on the interaction between learning of practice and learning of theory when students work with programming assignments in the laboratory.     

多元函数极值的一种新方法

通过一元函数求极值的方法，介绍了多元函数求极值的一种新方法，即利用梯度及内积，可简便地计算多元函数的极值。     

面向对象编程实现屏幕拷贝

用面向对象程序设计的方法，利用Delphi实现Windows环境下的屏幕拷贝。     

AOP技术的研究与探讨

通过介绍一种新的程序设计方法——面向方面编程方法(AOP)。这项新的编程技术弥补了面向对象编程技术在处理横切关注点时的不足。使用该方法,开发者可以开发出易于设计、理解和维护的系统,能有效地提交代码的质量。在此基础上就AOP产生的背景、基本概念以及它的研究方向和应用热点进行了重点分析。     

Ne tWare登录菜单的设计与实现

首先论述了NetWare386V3.12登录菜单的设计与实现方法,作为示例,然后详细地给出了一个实用的自动入网菜单登录程序