Results 351 to 360 of about 85,239 (405)

Uncovering the Landscape of Fraud and Spam in the Telephony Channel

International Conference on Machine Learning and Applications, 2016
Robocalling, voice phishing, and caller ID spoofing are common cybercrime techniques used to launch scam campaigns through the telephony channel, which unsuspecting users have long trusted.
A. Marzuoli, H. Kingravi, David Dewey, Robert S. Pienta   +3 more
semanticscholar   +1 more source

RootIO: ICT + telephony for grassroots radio

IST-Africa Week Conference, 2016
Communities across Africa depend on radio for access to information, often as their primary source of news and information. Given its importance, surprisingly little ICT work has focused on improving radio.
Chris Csikszentmihályi, Jude Mukundane
semanticscholar   +1 more source

Small Circles: Mobile Telephony and the Cultivation of the Private Sphere

The Information Society, 2014
This article examines how we use mobile telephony to maintain our physically and socially closest social circle. The analysis is based on traffic data gathered from Norway using approximately 24 million calls and texts made by private individuals ...
Rich Ling, Johannes Bjelland, P. Sundsøy, Scott W. Campbell   +3 more
semanticscholar   +1 more source

Transatlantic Radio Telephony [PDF]

Transactions of the American Institute of Electrical Engineers, 1923
The first transmission of the human voice across the Atlantic was accomplished by means of radio in 1915. Since that time substantial progress has been made in the art of radio telephony and in January of this year another important step was taken in the accomplishment of transoceanic voice communication.
H. D. Arnold, Lloyd Espenschied
openaire   +2 more sources

Information, Mobile Telephony, and Traders' Search Behavior in Niger

, 2014
Information and communications technologies have spread rapidly in developing countries. We investigate the impact of mobile phones on traders' search behavior in Niger by constructing a theoretical model of search in which traders engage in sequential ...
Jesse Tack, J. Aker
semanticscholar   +1 more source

Simultaneous Transmission and Reception in Radio Telephony

Proceedings of the Institute of Radio Engineers, 1920
After reviewing the methods of duplex radio communication previously proposed, the author describes a divided-branch antenna arrangement with supplementary balancing coil, for this purpose.
N. Marumo
semanticscholar   +1 more source

Carrier Current Telephony and Telegraphy

Transactions of the American Institute of Electrical Engineers
This paper briefly outlines first the history of the development of carrier multiplex telegraphy and telephony. The fundamental principles underlying particularly the newer developments of the art are then discussed.
E. H. Colpitts, O. B. Blackwell
semanticscholar   +1 more source

An introduction to telephony

2006
In this opening chapter we introduced the basics of telephony, in which economies are gained by the use of a single pair of wires to convey a two-way telephone call over the link to the serving exchange. We also examined the role of local, trunk and international exchanges, noting that they can be manual or automatic.
openaire   +2 more sources

Mobile Telephony and Economic Growth in Africa

, 2014
This article analyzes the impact of mobile telephony on economic growth in Africa. It uses panel data on 36 African countries over the period 1995 to 2010, and estimates an econometric model made up of two equations–one expressing output as a function of
E. Cleeve, Zelealem Yiheyis
semanticscholar   +1 more source

Multiplex telephony and telegraphy by means of electric waves guided by wires

Proceedings of the American Institute of Electrical Engineers
Electrical transmission of intelligence, so vital to the progress of civilization, has taken a development at present into telephony and telegraphy over metallic wires; and telegraphy, and, to a limited extent, telephony, through the medium of the ether ...
George D. Squier
semanticscholar   +1 more source