Wireless Local Area Networks (WLANs) are subjected to interference because of their working in Unlicensed Spectrum. Coverage ranges of WLANs are 30 to 300m. Channel Assignment is one of the most important problems in the WLANs. In this paper we present a Survey on the Channel Assignment techniques in IEEE 802.11.After analyzing different methods a qualitative comparison has been carried out for...

This paper evaluates the Total Vector Error of an estimated Phasor as define in IEEE C37.118 standard within different medium access in Local Area Networks (LAN). Three different LAN models (CSMA/CD, CSMA/AMP and Switched Ethernet) are evaluated. The Total Vector Error of the estimated Phasor has been evaluated for the effect of Nodes Number under the standardized network Band-width values defi...

1. The variation of threshold with field area was measured in fields homogeneous in rod-cone composition. At 15 degrees above the fovea, an increase in field diameter from 1 degrees to 5 degrees reduces the threshold sevenfold, at 25 degrees above the fovea tenfold. 2. These changes are shown to follow qualitatively from simple statistical properties of the retinal mosaic. Analytic treatment le...

Recently, low-power wireless networking standards like 802.15.1 (Bluetooth) have driven consumer interest in personal area networks (PANs). These networks are designed for inexpensively connecting low-power devices located within 1 m to 100 m of each other. In this paper, we discuss recent evolutions to the Bluetooth standard, as well as two emerging PAN standards: 802.15.4/ZigBee, and Ultra-Wi...

Cartesian routing is a fast packet routing mechanism intended for geographic addresses and can effectively accelerate the packet routing process within a local or metropolitan environment. The wide area Cartesian routing described in this paper is an extension of the Cartesian routing algorithms designed to make the exchange of internetwork packets between geographical regions possible. It also...

The Bay Area Photovoltaic Consortium (BAPVC) is conceived to create a vibrant forum for interaction among Photovoltaic (PV) industry and academic experts to address the critical challenges in converting the U.S. leadership in PV R&D into leadership in PV Manufacturing. The U.S. faces substantial challenges in building such a PV manufacturing base as many of our competitors benefit from fewer ma...

Chest NF Ray, M Thamer, B Fadillioglu and PJ Gergen analysis Race, income, urbanicity, and asthma hospitalization in California: a small area This information is current as of May 24, 2006 http://www.chestjournal.org the World Wide Web at: The online version of this article, along with updated information and services, is located on without the prior written permission of the copyright holder. ...

Boundary labeling is a relatively new labeling method. It can be useful in automating the production of technical drawings and medical maps, where it is common to explain certain parts of the drawing with text labels, arranged on its boundary so that other parts of the drawing are not obscured. In boundary labeling, we are given a rectangle R which encloses a set of n sites. Each site si is ass...