Culture and knowledge: Hypothesis on the interpretation of post-industrial society

In our social and cultural environment new technologies seem to be used more as means of production and transmission of knowledge. My paper is on some of the problems which — in my opinion — are relevant in such an environment on the basis of the implications and the characteristics owing to the analogic and the digital communication.     

低相干函数频响函数的无偏差估计方法

本文详细分析了现有输入噪声模型和输出噪声模型的抗噪声原理,提出了一种能同时抑制输入噪声和输出噪声的无偏差估计模型,它利用二次互功率谱代替通常估计中的自功率谱。使得由于噪声引起的误差可以通过多次平均完全消除。新估计模型的精度与输入噪声和输出噪声的水平无关,仅与统计次数有关。在输入、输出噪声不相关条件下,即使相干函数很低仍能通过多次平均获得具有足够精度的频响函数值。文章最后给出了不同噪声干扰下的(?)估计值、(?)估计值以及本文模型的(?)估计值,并与没有噪声干扰下的H_o 值进行比较。     

CDMA技术及其在通信中的应用

以扩频通信为基础的CDMA技术,是进入90年代以来通信领域中十分引人注目且特别活跃的多址通信技术。本文介绍了CDMA技术的原理、特点、实现和应用,并对CDMA技术在通信中的前景给予展望。     

Noble H. Kelley.

Presents the biography and scientific publications for Noble H. Kelley, the recipient of the 1974 Award for Distinguished Professional Contribution. For more than twenty years Secretary-Treasurer, Executive Officer, and Trustee of the American Board of Professional Psychology, he had come to personify the high standards of that respected institution, having for so long helped to articulate and implement its pursuit of excellence. While following a productive academic career that saw him head the departments and direct the psychological services at two universities, he gave his selfless devotion to the cause of identifying and enhancing competence in the professional application of psychology to human problems. Always ready to serve his profession, he devoted his time and his energies and gave his wise and experienced counsel to his colleagues and their organizations. His professional life spans a time which saw the maturing of the application of psychology as a professional endeavor, and to this development Noble H. Kelley has indeed made a distinguished contribution. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

WiFi通信的安全分析

通过分析当前应用广泛的WiFi技术以及WEP的工作过程,讲述其中存在的安全问题,从发现的缺陷中讲解破解方法,同时简单介绍国产WAPI技术情况。     

信息监控系统在电厂中的作用浅析

随着电站项目建设现代化管理的要求,"4C"(计算机、控制、通讯、CRT)技术应用的普及,电厂的信息监控系统(SIS)已经非常普及。通过介绍电厂信息系统架构的同时,对电站建设中对SIS的应用需注意的事项概述。     

电动机故障诊断实例分析

在炼化企业中广泛应用的电机,经过长期的运行会产生各种故障。文章介绍用振动信号细化谱,分析诊断电机振动故障,正确地区分是机械不对中还是真正的电气故障。     

利用时间脉冲实现对多个参数的通讯传输

本文介绍了一种在数据通讯过程中用一个指令来传输多个参数的方法,有效的解决了一些通讯过程中无法同时收发数据,或是无法同时传输多个参数的问题。     

进水阀补水比例测试机方案简述

本文介绍了进水阀补水比例自动测试机的设计方案、控制原理、计算机与PLC的通讯、PLC与电子称的通讯,以及Visual Basic语言在计算机控制程序中的应用。     

煤矿井下漏泄通信系统抗干扰技术

通过对煤矿井下电磁干扰测试和分析,发现井下电磁干扰主要有白噪声、脉冲干扰及窄带干扰。提出采用扩频通信、信道采用交织编码结合前向编码以及自适应傅立叶变换抑制窄带干扰等技术来抑制电磁对煤矿井下漏泄通信系统的干扰。