In this paper an overview of the wireless local area network (LAN) area is provided. The two types of wireless LAN topologies used today, infrastructure and ad hoc, are presented. The requirements that a wireless LAN is expected to meet are discussed. These requirements impact on the implementation of both the Physical and MAC layer of a wireless LAN. The unique characteristics of wireless phys...

Efficient, scalable remote access to data is a key aspect in wide area metacomputing environments. One of the limitations of current client-server computing models is their inability to create, retain and trade tokens which represent data or services on remote computers alongwith the metadata to adequately describe the data or services. Most current client-server software systems require the us...

Land use/land cover (LU/LC) changes were determined in an urban area, Tirupati, from 1976 to 2003 by using Geographical Information Systems (GISs) and remote sensing technology. These studies were employed by using the Survey of India topographic map 57 O/6 and the remote sensing data of LISS III and PAN of IRS ID of 2003. The study area was classified into eight categories on the basis of fiel...