Introduction to Mobile Multimedia Communications

2011 ◽  
pp. 1-23
Author(s):  
Gour C. Karmakar ◽  
Laurence S. Dooley ◽  
Michael Mathew
Keyword(s):  
Mobile Technology ◽  
Mobile Communication ◽  
Low Cost ◽  
Communication Technologies ◽  
Voice Communication ◽  
Switched Networks ◽  
Analog To Digital ◽  
4G Networks ◽  
Increasing Demand ◽  
4G Mobile Communication

In order to meet the ever increasing demand by people using mobile technology and its associated services based on multimedia elements in addition to voice, mobile communication technologies has since evolved from analog to digital and 1G to 4G. This chapter presents a contemporary review of all generations of mobile communication technologies, including their standards. 1G to 3G mobile communication technologies are mainly optimised for voice communication, using circuit switched networks. To provide high transmission mobile services at low cost in all levels of networks—personal, home, and cellular—it is imminent to exploit the merits of all existing technologies such as Bluetooth, WLAN, and HiperLAN, and use IP as a backbone network in 4G mobile communication standards. The key research challenges for mobile terminals, systems, and services for 4G networks are also presented in this chapter.

Introduction to Mobile Multimedia Communications

2008 ◽  
pp. 94-115
Author(s):  
Gour C. Karmakar ◽  
Laurence S. Dooley ◽  
Michael Mathew
Keyword(s):  
Mobile Technology ◽  
Mobile Communication ◽  
Low Cost ◽  
Communication Technologies ◽  
Voice Communication ◽  
Switched Networks ◽  
Analog To Digital ◽  
4G Networks ◽  
Increasing Demand ◽  
4G Mobile Communication

In order to meet the ever increasing demand by people using mobile technology and its associated services based on multimedia elements in addition to voice, mobile communication technologies has since evolved from analog to digital and 1G to 4G. This chapter presents a contemporary review of all generations of mobile communication technologies, including their standards. 1G to 3G mobile communication technologies are mainly optimised for voice communication, using circuit switched networks. To provide high transmission mobile services at low cost in all levels of networks—personal, home, and cellular—it is imminent to exploit the merits of all existing technologies such as Bluetooth, WLAN, and HiperLAN, and use IP as a backbone network in 4G mobile communication standards. The key research challenges for mobile terminals, systems, and services for 4G networks are also presented in this chapter.

James E. Katz: An Intellectual Biography

2015 ◽  
pp. 362-371
Author(s):  
Yi-Fan Chen ◽  
Katie Lever
Keyword(s):  
Mobile Technology ◽  
Mobile Communication ◽  
Technology Use ◽  
Communication Technologies ◽  
Social Consequences ◽  
Research Network ◽  
Communication Studies ◽  
Intellectual Biography ◽  
Research Activities ◽  
Social Uses

James E. Katz is an American pioneer in examining social consequences of mobile technology use in everyday life. He builds a global mobile communication research network and his work informs various mobile communication studies around the world. He explores how mobile technology's affect social interaction and what their uses reveal about human nature and organizations; Katz was among the first to demonstrate their pro-social uses. He also seeks to understand what the future holds in terms of society and communication technologies and works with others to explore ways in which society can best prepare itself to make the optimal use of new developments. This article documents Katz's research activities and his intellectual impacts on mobile communication studies.

Analysis and Study of 4G Mobile Communication Technology

2014 ◽  
Vol 644-650 ◽  
pp. 4391-4394
Author(s):  
Fang Shen ◽  
Gang Xu
Keyword(s):  
Communication Technology ◽  
Mobile Communication ◽  
Transmission Rate ◽  
Stable Operation ◽  
Communication Services ◽  
Wide Range ◽  
Key Technologies ◽  
Increasing Demand ◽  
Mobile Communication Technology ◽  
4G Mobile Communication

With the development of the society and increasing demand of life and work, mobile communication technology is undergoing tremendous change and progress, with a wide range of new services coming up and the range and number of users expanding.In a great variety of mobile communication services, 4G mobile communication technology, as the mainstream of the next generation of mobile communication, features stable operation, high transmission rate, and wide coverage.Based on 4G mobile communication technology, this paper performs profound study of its key technologies and applications.

Shifting Dynamics of Contention in the Digital Age

2020 ◽  
Author(s):  
Jun Liu
Keyword(s):  
Information And Communication Technologies ◽  
Mobile Communication ◽  
Communication Technologies ◽  
Digital Age ◽  
Chinese Society ◽  
Internet Users ◽  
Communicative Practice ◽  
Political Contention ◽  
Information And Communication ◽  
Everyday Resistance

Over the past decades, waves of political contention involving the use of information and communication technologies have swept across the globe. The phenomenon stimulates the scholarship on digital communication technologies and contentious collective action to thrive as an exciting, relevant, but highly fragmentary and contested field with disciplinary boundaries. To advance the interdisciplinary understanding, Shifting Dynamics of Contention in the Digital Age outlines a communication-centered framework that articulates the intricate relationship between technology, communication, and contention. It further prods us to engage more critically with existing theories from communication, sociology, and political science on digital technologies and political movements. Given the theoretical endeavor, Shifting Dynamics of Contention in the Digital Age systematically explores, for the first time, the influence of mobile technology on political contention in China, the country with the world’s largest number of mobile and Internet users. Using first-hand in-depth interview and fieldwork data, it tracks the strategic choice of mobile phones as repertoires of contention, illustrates the effective mobilization of mobile communication on the basis of its strong and reciprocal social ties, and identifies the communicative practice of forwarding officially alleged “rumors” as a form of everyday resistance. Through this ground-breaking study, Shifting Dynamics of Contention in the Digital Age presents a nuanced portrayal of an emerging dynamics of contention—both its strengths and limitations—through the embedding of mobile communication into Chinese society and politics.

scholarly journals Synthesis, Structure and Diffusion Pathways of Fast Lithium-Ion Conductors in the Polymorphs α- and β-Li8SnP4

2021 ◽  
Author(s):  
Thomas F Fässler ◽  
Stefan Strangmüller ◽  
Henrik Eickkhoff ◽  
Wilhelm Klein ◽  
Gabriele Raudaschl-Sieber ◽  
...  
Keyword(s):  
High Performance ◽  
Low Cost ◽  
Lithium Ion ◽  
Conducting Materials ◽  
Increasing Demand ◽  
Battery Technology ◽  
Lithium Ion Conductors ◽  
And Diffusion ◽  
Ion Conductors

The increasing demand for a high-performance and low-cost battery technology promotes the search for Li+-conducting materials. Recently, phosphidotetrelates and aluminates were introduced as an innovative class of phosphide-based Li+-conducting materials...

Voice In Ear

2021 ◽  
Vol 5 (1) ◽  
pp. 1-25
Author(s):  
Yang Gao ◽  
Yincheng Jin ◽  
Jagmohan Chauhan ◽  
Seokmin Choi ◽  
Jiyang Li ◽  
...  
Keyword(s):  
User Authentication ◽  
Low Cost ◽  
The Body ◽  
Ear Canal ◽  
Replay Attacks ◽  
Increasing Demand ◽  
The Right ◽  
Sound Conduction ◽  
Enrollment Data ◽  
Secure Authentication

With the rapid growth of wearable computing and increasing demand for mobile authentication scenarios, voiceprint-based authentication has become one of the prevalent technologies and has already presented tremendous potentials to the public. However, it is vulnerable to voice spoofing attacks (e.g., replay attacks and synthetic voice attacks). To address this threat, we propose a new biometric authentication approach, named EarPrint, which aims to extend voiceprint and build a hidden and secure user authentication scheme on earphones. EarPrint builds on the speaking-induced body sound transmission from the throat to the ear canal, i.e., different users will have different body sound conduction patterns on both sides of ears. As the first exploratory study, extensive experiments on 23 subjects show the EarPrint is robust against ambient noises and body motions. EarPrint achieves an Equal Error Rate (EER) of 3.64% with 75 seconds enrollment data. We also evaluate the resilience of EarPrint against replay attacks. A major contribution of EarPrint is that it leverages two-level uniqueness, including the body sound conduction from the throat to the ear canal and the body asymmetry between the left and the right ears, taking advantage of earphones' paring form-factor. Compared with other mobile and wearable biometric modalities, EarPrint is a low-cost, accurate, and secure authentication solution for earphone users.

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