The first stepping stone in migration path to third generation wireless mobile services (3G) is the General Packet Radio Services, GPRS, a packet-switched technology that delivers speeds of up to 115kbps. If GPRS is already in place, Enhanced Data rates for Global Evolution (EDGE) technology is most effective as the second stepping stone that gives a low impact migration. Only software upgrades and EDGE plug-in transceiver units are needed. The approach protects operators' investments by allowing them to reuse their existing network equipment a ....etc

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Global system for mobile communication (GSM) is a globally accepted standard for digital cellular communication. GSM is the name of a standardization group established in 1982 to create a common European mobile telephone standard that would formulate specifications for a pan-European mobile cellular radio system operating at 900 MHz. It is estimated that many countries outside of Europe will join the GSM partnership.Throughout the evolution of cellular telecommunications, various systems have been developed without the benefit of standardized s ....etc

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.GLOBAL POSITIONING SYSTEM (GPS) OVERVIEW

GPS atau Global Positioning System, merupakan sebuah alat atau sistem yang
dapat digunakan untuk menginformasikan penggunanya dimana dia berada (secara global)
di permukaan bumi yang berbasiskan satelit. Data dikirim dari satelit berupa sinyal radio
dengan data digital. Dimanapun anda berada, maka GPS bisa membantu menunjukan arah,
selama anda melihat langit. Layanan GPS ini tersedia gratis, bahkan tidak perlu
mengeluarkan biaya apapun kecuali membeli GPS recierver-rya.
Awalnya GPS hanya ....etc

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anti collision system in railway using gsm with circuit
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This is a new technique for the protection of transmission systems by using the global positioning system (GPS) and fault generated transients. In this scheme the relay contains a fault transient detection system together with a communication unit, which is connected to the power line through the high voltage coupling capacitors of the CVT.

Relays are installed at each bus bar in a transmission network. These detect the fault generated high frequency voltage transient signals and record the time instant corresponding to when the initial ....etc

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Based on closed form expressions for the power frequency voltages and currents in a typical distribution network, the voltage regulation VR at any time point during the day could be evaluated. It will depend primarily on the network configuration, the daily load curve, the load density and its power factor as well as level of the reactive power compensation.

The computed at a certain time?t? can give a useful indicator for the voltage constancy over the network at that time point. The concept of ?Global Voltage Regulation? is introduced. Th ....etc

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Global Issues: Ozone Depletion, Global Warming and Acid Rain

Introduction

Air pollution is exerting increasing impact on the environment. Humans have been altering the chemistry of the atmosphere on a global scale. These changes may:
Modify the global climate
Threaten the health of human beings
Create many environmental problems such as
Acid rain
Depletion of ozone layer
Global warming
Seriously upset the global ecosystem

What is ozone depletion?

Ozone is a highly reactive gas comprising ....etc

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virtually every cellular handset on the planet enjoyed accurate location awareness? GloPos, a startup that's about to leave stealth mode whose self-learning software algorithm enables any basic GSM or CDMA cellular phone to provide extremely precise locational data without using GPS”or even Wi-Fi ....etc

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wireless networking and Global Positioning System (GPS)



INTRODUCTION

Augmented reality (AR) refers to computer displays that add virtual information to a user’s sensory perception. Most AR research focuses on see-through devices, usually worn on the head that overlay graphics and text on the user’s view of his or her surroundings. In general it superimposes graphics over a real world environment in real time.

Getting the right information at t ....etc

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