We can classify the telecommunication network from target of service , movable / immovable users , signal form , bearer services , transmission media , zone of service , interchange mode etc . the telecommunication network services are the ‘ products ’ and can be classified based on the standards of sense , user active state , communication objective , information media and network hierarchies 对电信网效益进行了重新定义,深入地研究了电信网效益的内涵和分类、电信网经济效益和社会效益的形成机制、电信网经济效益的指数评价方法和dea评价方法,构造了电信网社会效益的评价体系。
The modern development of the multimedia technology makes it possible that computer intensively manage and dispose much information media such as characters , graphics , sound , image and so on . thereby modern educational technological means , whose center is computer , become an important experimental area in the new century 现代多媒体技术的发展，使计算机能将文字、图形、声音、图像等传播信息的媒体集约化管理和处理，从而使以计算机为核心的现代教育技术手段成为新时期学校教学改革的重点试验田。
With the booming development of information industry , the digitalization of information media and the exceptional growing of computer networks , we can get digital information conveniently and quickly . but the negative effect of digitalization technology has made the copyright and security of digital information products be widely threatened now 今天，伴随着信息产业的飞速发展，信息媒体的数字化和计算机网络通讯技术使得人们对数字信息的获取极为迅捷方便，但是由数字化技术自身特性所产生的负面效应? ?对数字化信息产品的非法侵权盗版和恶意篡改? ?也日益严峻。
China is to be involved in the global system of information media more deeply , and chinese periodicals will facing the pressure of international media and hore competition . for the progress , such as how to play the role of media and how to communicate advanced chinese culture , chinese periodicals , under the planed economic systerm for a long period , now facing the unpredented challenge from market economy 由此，中国的期刊业将面临国际传媒的巨大压力和更加激烈的竞争。在生存和发展的问题上，在如何更好地发挥媒体作用，传播中国先进文化方面，长期在计划经济体制下运行的中国期刊，遭遇到前所未有的市场经济的挑战。
The digitalization of information medium provides much convenience for information store and access and also improves the efficiency and accuracy of information expression . especially , with the development of computer and network communication technology , data exchange and transmission become comparably simple 信息媒体的数字化为信息的存取提供了极大的便利性,同时也提高了信息表达的效率和准确性,特别是随着计算机网络通讯技术的发展,数据的交换和传输变成了一个相对简单的过程。
The network technology has penetrated in all sides of the society . accompany ing the rapid development of network all over the world , more and more information mediums such as database and information system are enterring in it , which has made internet become the most abundant and sweeping database of the world 网络技术已经渗透到了社会生活的方方面面，随着因特网在世界范围的迅速发展，越来越多的数据库和信息系统不断加入网络，使得internet发展为当今世界上门类最全、规模最大的信息库。
Some new conclusions have been reached through the research : as a main information channel , an important social support and social pressure source and a decision - making reference system , the rpg is an essential elementary of agricultural technology communication ; the rpg members have gradational opinion status and different communication resources and effects ; opinion leader is the core of the rpg ' s inner communication as well as the information medium and the final checkup guard man between the group and outer environment ; rural secondary group ( rsg ) ' s influences on prg are realized by opinion leader 在此基础上，笔者得出了以下结论：初级群体是农业科技传播的主体和基础，是农民获取信息的主要渠道之一，也是社会支持、社会压力的重要来源和决策的重要参照体系；意见领袖是初级群体内部传播的核心，是外部信息进入群体的中介和把关人，也是其他成员决策的重要参照；次级群体对初级群体的影响主要通过意见领袖实现。
The range of information media expands rapidly which is disposed by computers , not only we require the databases and other information systems can deal with storage and key frames retrieval to the images , video and audio , but also we need to analyze the content of multimedia data to reach deeper retrieval levels 计算机所能处理的信息媒体范围迅速扩大,不仅要求数据库和其它信息系统能对图像、视频和声音等媒体进行存储和基于关键字的检索,而且要对多媒体数据的内容进行检索,以达到更深的检索层次,从而基于内容的多媒体信息检索系统应运而生。
