| || Wireless media: A new paradigm
Author :Kush, Ashwani;Chauhan, R.K.
Source: DESIDOC Bulletin of Information Technology :23(3) ; 2003 ; pp.03-09
Abstract : In this review we have tried to represent knowledge about wireless media, which is fast emerging as a new area in the field of computer science. Wireless networks are emerging fast as latest technology, to allow users to access information and services via electronic media, without taking geographic position in account. Mobile hosts and wireless networking hardware are becoming widely available, and extensive work has been done recently in integrating these elements into traditional networks such as the Internet. We have tried to present the basic knowledge required for a layman to know about Wireless media starting from History to most current trends and trends still to come. This effort is a part of research work by authors in mobile computing. The review is divided into four parts as history, evolution of cellular networks, wireless devices and types of wireless media. A tabular representation based on comparative study is shown for wireless media attributes such as frequency range, cost, installation, bandwidth and node capacity, etc.
Keywords : Wireless media;Mobile cellular networks;Mobile devices
| || Search Engines Evaluation
Author :Rakesh Kumar;Suri, P.K.;Chauhan, R.K.
Source: DESIDOC Bulletin of Information Technology :25(2) ; 2005 ; pp.03-10
Abstract : The volume of world wide web (WWW) is increasing enormously due to a world wide move to migrate information to online sources. To search some information on WWW, search engines are used, which when presented with queries, return a list of web pages ranked on the basis of estimation of relevance. Generally the search engines due to the abundance of information available on the web return millions of pages. But user studies indicate that a common user browses through top 10 or 20 documents only. So it’s all-important to get into those top 10 documents. To achieve this web authors are increasingly beginning to rely on underhand techniques to ensure their sites get seen, in turn affecting the performance of search engines. The existing measures to evaluate these systems’ performance are not adequate in the current world of highly interactive end-user systems. In this study a metric 'Ranked Precision' is proposed to evaluate the performance of search engines.
Keywords : Search engines;Keyword spamming;Web page ranking