IBM-PC/XT微型计算机在UPS电源切换过渡特性测量中的应用

本文介绍采用IBM-PC/XT微型计算机构成的一个自动测量系统。这个系统用于采集UPS电源在切换瞬间发生的过渡过程的电压值,并以曲线圈的形式在CRT上显示出来,亦可通过打印机作硬挎贝输出。     

通用型阶梯式可转位端铣刀试验与研究

本文利用阶梯切削法原理，研究径向错移量较大的单组阶梯式铣削方法，进行了阶梯式可转位端铣刀结构设计计算公式的推导，并做了大量的切削性能对比试验，试验结果与预测指标相符。     

Genetic programming as a means for programming computers by natural selection

Many seemingly different problems in machine learning, artificial intelligence, and symbolic processing can be viewed as requiring the discovery of a computer program that produces some desired output for particular inputs. When viewed in this way, the process of solving these problems becomes equivalent to searching a space of possible computer programs for a highly fit individual computer program. The recently developed genetic programming paradigm described herein provides a way to search the space of possible computer programs for a highly fit individual computer program to solve (or approximately solve) a surprising variety of different problems from different fields. In genetic programming, populations of computer programs are genetically bred using the Darwinian principle of survival of the fittest and using a genetic crossover (sexual recombination) operator appropriate for genetically mating computer programs. Genetic programming is illustrated via an example of machine learning of the Boolean 11-multiplexer function and symbolic regression of the econometric exchange equation from noisy empirical data.Hierarchical automatic function definition enables genetic programming to define potentially useful functions automatically and dynamically during a run, much as a human programmer writing a complex computer program creates subroutines (procedures, functions) to perform groups of steps which must be performed with different instantiations of the dummy variables (formal parameters) in more than one place in the main program. Hierarchical automatic function definition is illustrated via the machine learning of the Boolean 11-parity function.     

R package rjmcmc: reversible jump MCMC using post‐processing

The rjmcmc package for R implements the post‐processing reversible jump Markov chain Monte Carlo (MCMC) algorithm of Barker & Link. MCMC output from each of the models is used to estimate posterior model probabilities and Bayes factors. Automatic differentiation is used to simplify implementation. The package is demonstrated on two examples.     

论元代文人篆刻崛起的文化背景

蒙元贵族对印章的大量需求、异族文化情趣对汉族文人的影响等因素相互作用 ,促进了元代文人对印章制度的探讨 ,促进了印文内容和用印方式的变化 ,促进了印章材料的多样化择取 ,并最终促成了以朱、王冕为代表的文人篆刻艺术的崛起     

基于AutoCAD的产品铭牌自动设计

本文在分析CAD数据交换文件DXF的基础上,根据文字绕排的形式,利用Windows系统提供的动态数据交换（DDE）技术,讨论了由VB通过DDE来控制AutoCAD自动绘图的方法,在Auto-CAD中,实现了铝牌、印章的自动设计。     

以PLC为核心的自动监测系统的设计方法

本文主要讨论了以可编程序控制器（PLC）为核心的自动监测系统的设计问题,PLC是一种新型自动控制器件,它具有计算机的部分功能,又能直接与强电相连接,是自控系统的一个重要分支,本文讨论了PLC应用系统的软、硬件设计方法．     

矢量汉字分段处理

根据激光加工的特点 ,从传统字库中调出来的矢量汉字经过数据信息处理及转换 ,在二坐标激光加工机上加工 ,发现加工出的汉字轮廓粗糙难看、光顺性差 ,这是由于轮廓线多由碎直线段组成 针对这种情况 ,着重研究了为后续B样条、分段圆弧逼近 ,为防止字形失真而采用的分段算法     

积极认知行为治疗的基本方法

积极认知行为治疗以调动患者的积极性和主动性为核心,在治疗师的积极引导下,指导患者自主完成思维记录和自我探索负性情绪对抗行为,并进行认知重建和行为矫正,以达到心理治疗的效果。积极认知行为治疗的操作程序包括四个阶段:首次会谈与诊断评估阶段、自我探索阶段、强化巩固阶段、效果评估和回归社会阶段。而自我探索阶段是整个治疗过程中的核心阶段,主要通过建立在患者问题概念化基础之上的"积极认知行为治疗记录"来分步完成。而六个核心治疗环节依次是:临床访谈、躯体和心理检查、对患者关于积极认知行为治疗表格记录和表中关系要素说明、对抗负性情绪行为模式的自我探索、非理性信念的批判及理性信念的建立、有效对抗负性情绪行为模式的确定和强化巩固。     

某型飞机发动机油封装置的研制

飞机发动机油封是发动机在贮藏和运输时防止其零件发生锈蚀的主要装置.本文介绍某型飞机发动机油封装置的研制,使用结果表明:该油封装置操作简便,全封闭无污染,各项指标均达到航空发动机地面维护规程规范,保证了发动机在封存期间的完好性,具有明显的社会经济效益.