适用于信息设备的汉字输入法研究

当前,小电器产品和移动通讯产品都朝着数字化和网络化方向发展,特征之一是允许企业和用户之间、用户和用户之间可以进行交互式的信息交换,汉字输入对于这类产品在中国的推广应用是非常重要的。本文介绍了一种适用于数字键盘上使用的汉字输入技术,它由基于数字键盘的英文、全拼和前导拼音输入法组成,能够用于各类信息设备进行大量中英文混合信息的方便、快速输入。本文首先描述了输入法设计思想,然后分析了其性能和特点。     

通用串行总线的原理及其实现

解释了ＵＳＢ标准（Ｒｅｖ．１．０）里的这些事件原理和实现方法,包括ＵＳＢ数据的交换分类、接入／断开操作和设备列举过程等。并选用Ｉｎｔｅｌ８ｘ９３０ＵＳＢ微控器来说明具体的实现方法和编程模型。     

台达PLC在液压码坯机电气控制中的应用

本文介绍了台达DVP—PLC—ES系列PLC在液压码坯机电气控制系统中的应用。使用PLC,不但成功代替了原继电器控制系统的控制和维护功能,而且还增加了节能功能,优化了系统,降低了人工维护成本,具有广阔的市场前景。     

Color image segmentation in HSI space for automotive applications

This article presents a method for classifying color points for automotive applications in the Hue Saturation Intensity (HSI) Space based on the distances between their projections onto the SI plane. Firstly the HSI Space is analyzed in detail. Secondly the projection of image points from a typical automotive scene onto the SI plane is shown. The minimal classes relevant for driver assistance applications are derived. The requirements for the classification of the points into those classes are obtained. Several weighting functions are proposed and a fast form of an euclidean metric is investigated in detail. In order to improve the sensitivity of the weighting function, dynamic coefficients are introduced. It is shown how to compute them automatically in order to get optimal results for the classification. Finally some results of applying the metric to the sample images are shown and the conclusions are drawn.

PLC高速计数模块在数控装置中的应用

本文主要介绍了PLC高速计数特殊功能模块在数控装置中的应用实例,分析了控制系统的基本原理,同时也对控制编程的要点进行了相应的介绍和分析,该实例具有一定参考价值。     

基于PCM饼干PC的定向计算机等效器

介绍了以PCM-4825L饼干PC为核心构成的某装备定向计算机等效器的组成、特点及其所能实现的主要功能,重点分析了等效器的硬、软件设计,给出了CCD数据采集扩展应用方法。     

基于Windows2000WDM模型的AD板采样驱动程序的设计

介绍了Windows2000操作系统下的WDM驱动程序基本设计方法,并以一款AD板为例给出了驱动入口点、创建和删除设备、硬件资源分配和访问、Win32应用程序接口等的具体实现,最后介绍了设备驱动程序的安装步骤。     

基于NS2的蓝牙设备发现机制分析*

对蓝牙设备连接机制进行了研究,分析了点到点连接建立的延迟。根据散射网情况下多个设备间的发现机理,采用对称设备发现机制实现了网络中的设备发现过程。通过建立处于扫描状态的设备被其他设备发现的数学模型,指出了优化设备发现算法中的关键参数值的问题,从而提高了设备发现阶段的效率。基于NS2的仿真实验证实了得到的关键参数值的正确性。     

一种虚拟场景控制方法的研究与实现

针对虚拟场景中视点控制和模型控制两种情况,研究了应用二维鼠标和三维输入设备拾取三维对象模型、移动对象模型和在虚拟场景中漫游的方法,提出了一种用二维鼠标拾取三维模型的方法——粗区域判断、最近拾取,并基于Vega视景仿真开发平台和VC++提出了一种基于二维鼠标拾取、三维输入设备移动的虚拟场景控制方法。     

Role of formal instruction and informal practice in learning to drive

Abstract

Learning to drive a motor vehicle is important for the mobility of the majority of people in industrialized countries. Although a great deal is known about the acquisition of psychomotor skills in the laboratory and in some other practical settings, there has been little scientific study of learning to drive. One major practical question concerns the value of formal tuition with a qualified instructor and informal practice with friends or relatives. This paper reports a cross-sectional study of 805 learner drivers in the UK who had undergone at least 5 h of formal tuition to examine associations between their history of formal tuition and practice and current levels of skill and confidence as assessed by both pupils and their instructors. The results indicated an increase in instructor ratings of pupil skill with both increasing practice and tuition. However, the relationship between tuition and instructor-rated skill was only observed in pupils who had had no practice. Pupils' self-confidence did not increase with either tuition or practice; instructors' feelings of confidence in and safety with the pupil increased with pupils' prior hours of practice but not tuition. Instructors' ratings of the likelihood that pupils would pass the driving test first lime were positively associated with prior hours of practice and negatively associated with prior formal tuition. The results suggest that informal practice constitutes an important element of the process of learning to drive. Longitudinal and experimental studies are now required to confirm this finding and to establish whether recommendations should be made for a component of driving tuition involving supervised practice.