نتایج جستجو برای: gsm mobile phones
تعداد نتایج: 177530 فیلتر نتایج به سال:
Today’s mobile phones are considered as fashion gadgets, communication devices, personal organisers and are rapidly moving toward becoming personal computers. The devices, networks and operating systems are getting ever sophisticated, while the price of devices and network connection is falling rapidly. This has increased the span of mobile users and ability to explore the limitation of the dev...
Introduction: Radiation from cell phones has been associated with an increased risk of cancer. The literature has reported evidence of certain biological effects resulting from exposure to various wavelengths, doses, and intensities of radiofrequency radiation. The present study aimed to evaluate the possible adverse effects of radiation from a GSM mobile phone operating at 900 MHz on human mel...
Wireless localization has been an active research area over the last decade due to its endless applications. In this paper, we investigate received signal strength (RSS) based estimation of a mobile station’s location, through monitoring the RSS at multiple reference software defined radio (SDR) receivers. Uplink transmission power of the mobile stations and path loss exponent are assumed to be...
OBJECTIVES The objective of this study was to examine whether acute exposure to radio frequency electromagnetic fields (REFs) emitted by mobile phone may affect subjective symptoms. METHODS Three large groups of volunteers (total 496) were exposed to REFs emitted by mobile phones in one session and sham signals in a different session. REF and sham exposure sessions were counterbalanced and do...
In May, 2011, 30 scientists from 14 countries met at the International Agency for Research on Cancer (IARC) in Lyon, France, to assess the carcinogenicity of radiofrequency electromagnetic fi elds (RF-EMF). These assessments will be published as Volume 102 of the IARC Monographs. Human exposures to RF-EMF (frequency range 30 kHz–300 GHz) can occur from use of personal devices (eg, mobile teleph...
Dear Editor,Lack of ionizing radiation and the low level energy emission from cell phones initially led to a public perception that use of mobile phones is safe. However, the dramatic increase in the use of cell phones has generated great concerns about their potential adverse effects. We have previously found no association between self-reported illness symptoms and the exposures to microwave ...
The way people communicate is changing very fast. Few years ago, mobile phones were used exclusively for voice calls. Today the mobile terminal usage is no longer restricted to voice communication only. In Finland, it is widely accepted among youngsters to use a GSM phone for sending SMS messages, to chat with friends or to play games. Adults may be more interested in checking their stocks or p...
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...
The technologies of mobile communications and ubiquitous computing pervade our society, and wireless networks sense the movement of people and vehicles, generating large volumes of mobility data. Miniaturization, wearability, pervasiveness are producing traces of our mobile activity, with increasing positioning accuracy and semantic richness: Location data from mobile phones (GSM cell positions...
Wireless communication technologies are pervasive in today’s everyday environment. Together with the ever-dropping cost for equipment relying on such technology, this abundance gives rise to a wealth of applications well beyond communication itself. Utilizing communication technologies in the context of mobile sensing seems to be an especially promising approach, as mobile phones and other pers...
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