1.1 Good sources for subscriber numbers and other statistics are, e.g., www.gsmworld.com, www.3gpp.org, www.3gpp2.org, www.emc-database.com, www.3g.co.uk, www.regtp.de ... 1.2 Today’s GSM operators add the new 3G air interfaces of UMTS to their existing GSM/GPRS infrastructure networks. Current GSM/GPRS networks already offer packet and circuit switched data transmission following the Release 9...

New approaches are needed for improving the performance of small antennas to fulfill the multiband operation requirements of future wireless mobile communications terminals. In this paper, a novel low-loss frequencytuning circuit for mobile handset antennas is proposed. The presented design takes into account several factors that affect the practical mobile handset antenna design, such as the b...

The proposed framework describes a service for users that gives them the ability to make gsm calls from their smartphones without revealing their identity. The principle to achieve that is simple: instead of using your cell phone to make a call, pick somebody else’s phone to do so. We proposed an infrastructure of smartphones, sip registrars and sip proxies to provide caller anonymity. We devel...

reply to the letter sent by prof. viroj wiwanitkit entitled “radiofrequency radiation and human ferritin”   authors of the article entitled “effects of radiofrequency radiation on human ferritin: an in-vitro enzymun assay” [1] would like to express their satisfactions, since the manuscript have been accessed and used as an element of reflection by a renowned researchers such as prof. wiwanitkit...

In 1995 many people reported symptoms such as headaches, feelings of discomfort, warmth behind/around or on the ear and difficulties concentrating while using mobile phones. The number of complaints was higher for people using the digital (GSM) system, i.e. with pulse modulated fields, than for those using the analogue (NMT) system. Our main hypothesis was that GSM users experience more symptom...

Background: Infertility is defined as inability to conceive after a year of sexual intercourses without the use of contraceptives. In half of the cases the causative factor is the male. Males are exposed to the effect of various environmental factors, which may decrease their reproductive capabilities. Phone electromagnetic power is very small, only a few hundredths of a microwave oven, but bec...

<span>Agriculture plays an important role in economic aspects most countries like India. Numerous problems associated with farming are continuously affecting the actions that happening country. A potential resolution for such issues to be eradicated, one should combine technological advancements current ongoing agricultural practices. Good practice will increase crop productivity and redu...