移动电话机的电磁辐射

从标准和测量技术方面简要介绍了移动电话机的电磁辐射。     

空间电磁辐射测试接收机自动测量系统的研究

本文首先介绍了EMC的概念、国际上有关EMC的标准化组织和标准,以及电磁辐射的机理和测试方法;然后结合电磁辐射测试接收机的结构特点,详细阐述了作者提出的自动测量系统的设计方法棗基于INTEL公司的80C196KC设计,并且分别从硬件和软件的角度给出了系统的抗干扰措施;最后探讨了在系统联调和指标测试过程中遇到的问题及其解决方法.     

电磁辐射及其安全区域估算和辐射场强测量的探讨

本文就电磁辐射对人体的影响及柑关的电磁辐射安全标准进行概述,并就如何对地面移动通信的电磁辐射场强值预测、安全区域估算和辐射场强值的测量作探讨性介绍。     

一种简便的手机辐射测试方法

针对电磁辐射对人体健康的影响及危害,对手机电磁辐射的测量标准给出了定义和计算公式,介绍了一种简便的手机辐射测试方法。根据该测试方法,得到了一些手机对人体电磁辐射强度的数据,对测试结果进行了分析,并给出了手机电磁辐射防护的建议。     

解析车载音视频设备电磁兼容标准

介绍了车载音视频设备电磁兼容标准,从标准的整体内容到具体试验项目说明了该标准与所参考的国际标准及欧盟指令的不同之处,其中包括骚扰和抗扰度测量。阐述了测量设备的选择使用、测试场地的应用及测量布置。     

中,短波天线近区电磁辐射的认识

为了让大家了解有关电磁辐射方面的常识，本对有关广播、电视发射台电磁辐射保护的两个标准做了简单的介绍，并结合测量中、短波发射近区场强实际数据定量地对电磁辐射民政部进行了分析，提出了自己的看法。     

电磁辐射及其安全区域估算和辐射场强测量的探讨

本文就电磁辐射对人体的影响及相关的电磁辐射安全标准进行概述，并就如何对地面移动通信的电磁辐射场强值预测、安全区域估算和辐射场强值的测量作探讨性介绍。     

电磁辐射场强估算与深圳中波电台实例分析

本文介绍了无线电电磁辐射及其对人体设备系统的影响,和我国现行的电磁辐射限值标准.通过对电磁辐射场强估算的理论分析以及对中波电台的实际测量,来对深圳市广播电台电磁辐射情况进行分析评价.     

脉冲雷达电磁辐射的宽带场强仪测量方法

针对脉冲雷达的电磁辐射特点及标准测试要求,分析了宽带场强仪在测试脉冲雷达信号时的响应特性,提出使用宽带场强仪测量脉冲雷达电磁辐射应进行测量示值误差修正,对于旋转雷达还应进行照射时间修正。总结了脉冲雷达电磁辐射的宽带场强仪测量方法,给出了宽带场强仪脉冲测量示值误差修正方法以及雷达照射时间修正方法。     

电磁辐射场强估算与深圳中波电台实例分析

介绍了无线电电磁辐射及其对人体和其他设备系统韵影响．以及我国现行的电磁辐射限值标准。通过对电磁辐射场强估算的理论分析以及对中波电台的实际测量来对深圳市广播电台电磁辐射情况进行分析评价。     

Reliability methods and standards

This tutorial focuses on three aspects of standardization: existing standards and organizations, evolution of standards and creation of new standards, new developments.An overview of existing standards and involved organizations is given. The main standardization institutes and forums for semiconductor reliability are described.The process of introducing new standards and changes is described. New and changed standards are needed when technologies change and when increased knowledge leads to better methods. Also, new application areas and changed customer requirements may lead to changed or new methods.Advantages and disadvantages of standards are discussed, with emphasis on standards for qualification. Development and use of knowledge-based methods is addressed.     

视频质量评估方法及规范

在视频业务应用(如视频电话)越来越广泛的今天,研究其质量评估方法具有十分重要的意义.本文结合ITU-T规范介绍了视频质量评估的研究背景和现状、评估方法、规范进展等,其中包含了一些还在研究的规范,使得对视频质量评估的国际规范进程有了一定了解,对以后的研究工作和业务的更好开展都有着促进作用.     

Speech coding methods, standards, and applications

Voice is the preferred method of human communication. Although there have been times when it seemed that the voice communications problem was solved, such as when the PSTN was our primary network or later when digital cellular networks reached maturity, such is not the case today. This paper addresses the challenges and opportunities starting from the basic issues in speech coder design, developing the important speech coding techniques and standards, discussing current and future applications, outlining techniques for evaluating speech coder performance, and identifying research directions. The most prominent speech coding standards are presented and their properties, such as performance, complexity, and coding delay, analyzed. Particular networks and applications for each standard are included. Further, reflecting upon the issues and developments highlighted in this paper, it becomes evident that there is a diverse set of challenges and opportunities for research and innovation in speech coding and voice communications.     

面向对象的软件测试方法研究

软件测试是软件质量保证的重要前提,在软件开发中要十分重视软件测试在软件开发中的作用.针对面向对象软件测试方法的特点,从软件测试技术的过程、测试测评的方法等方面对软件测试技术进行探讨.     

MPLS VPN的测试方法

VPN技术最大的特点是，可以让企业降低建设、运行网络的成本，加快生产、销售等运作流程。据Infonetics公司预测，全世界VPN产品和服务的销售量在2001年到2005年间将增长275％，从128亿增长到480亿美元。在考虑是否建立VPN的同时，还要考虑建立VPN后如何能够验证它的性能，保证高质量的服务。这对于一个小型网络来说可能还不算什么大问题。但是，如果对于组建一个跨区域的甚至跨国的大型VPN网络，就不是件容易的事情。要想成功地运营一个VPN网络，必须首先要在建设阶段做好网络测试工作，在长期运行过程中，能够对从每个会话到全部…     

PHS系统测试方法探讨

1PHS系统技术介绍 PHS属第二代通信技术,它与GSM、D-AMPS等处于同一个技术发展等级.比AMPS、TACS等模拟技术先进,而落后于WCDMA,CDMA2000等3G技术.系统的典型配置如图1所示.     

New testing methods and new testing tools for systems utilizing substation communication networks

The upcoming standard IEC 61850 prepares the ground for the broad application of data communication networks and systems in substations. With the new systems becoming installed, new testing methods and tools will be required in addition to the established ones. Also the established methods need some adaption to the new situation. This paper gives an overview about the technology, the possible effects on testing, and outlines test methods and tools to be applied.     

国内外激光参数测试方法标准近况

评述了九十年代以来ＩＳＯ和ＩＥＣ颁布或编制的十二种激光参数测试方法的国际标准以及近期编写和修订的几种国家标准。     

Principles and methods of testing finite state machines-a survey

With advanced computer technology, systems are getting larger to fulfill more complicated tasks: however, they are also becoming less reliable. Consequently, testing is an indispensable part of system design and implementation; yet it has proved to be a formidable task for complex systems. This motivates the study of testing finite stare machines to ensure the correct functioning of systems and to discover aspects of their behavior. A finite state machine contains a finite number of states and produces outputs on state transitions after receiving inputs. Finite state machines are widely used to model systems in diverse areas, including sequential circuits, certain types of programs, and, more recently, communication protocols. In a testing problem we have a machine about which we lack some information; we would like to deduce this information by providing a sequence of inputs to the machine and observing the outputs produced. Because of its practical importance and theoretical interest, the problem of testing finite state machines has been studied in different areas and at various times. The earliest published literature on this topic dates back to the 1950's. Activities in the 1960's mid early 1970's were motivated mainly by automata theory and sequential circuit testing. The area seemed to have mostly died down until a few years ago when the testing problem was resurrected and is now being studied anew due to its applications to conformance testing of communication protocols. While some old problems which had been open for decades were resolved recently, new concepts and more intriguing problems from new applications emerge. We review the fundamental problems in testing finite state machines and techniques for solving these problems, tracing progress in the area from its inception to the present and the stare of the art. In addition, we discuss extensions of finite state machines and some other topics related to testing