Sökning: "mobile telephony"

Visar resultat 1 - 5 av 23 avhandlingar innehållade orden mobile telephony.

  1. 1. IP telephony : Mobility and security

    Författare :Jon-Olov Vatn; Björn Pehrson; William Arbaugh; KTH; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Telekommunikation; Telekommunikation; Telecommunication; Telekommunikation;

    Sammanfattning : With the introduction of IP based telephony services, the Internet has started to challenge the traditional PSTN networks as an infrastructure for providing real-time interactive services. This upcoming paradigm shift is not only driven by the desire to provide cost efficient solutions, but by basing the communication on IP we expect that the end-users will experience a greater set of attractive services over a single connection compared to what is provided by a PSTN today. LÄS MER

  2. 2. Mobile Supported e-Government Systems : Analysis of the Education Management Information System (EMIS) in Tanzania

    Författare :Gudrun Wicander; John-Sören Pettersson; Anders G. Nilsson; Peter Rönnlund; Louise Yngström; Karlstads universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; e-Government systems; mobile telephony; SMS; blended digital system; education management; information systems; systems theory; developing countries; Tanzania; ICT4D; M4D; Information Systems; Informatik;

    Sammanfattning : e-Government systems are considered by both governments and international organisations to improve administration and management. In Tanzania, an e-government system for education administration, EMIS, is partly implemented but shows several limitations. LÄS MER

  3. 3. The history of the future : an investigation of the evolution of mobile telephony

    Författare :Sven Lindmark; Chalmers University of Technology; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; radio; mobile telephony; telecommunications services; technology management; diffusion; history; application diversification; competition;

    Sammanfattning : .... LÄS MER

  4. 4. Evolution of Techno-Economic Systems - An Investigation of the History of Mobile Communications

    Författare :Sven Lindmark; Chalmers University of Technology; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; mobile data communications; application diversification; mobile telephony; standards; complementarities; diffusion; techno-economic systems; convergence; competition; technological change;

    Sammanfattning : The purpose of this thesis is to contribute to the understanding of how techno-economic systems emerge and evolve and how such processes can be analyzed. To these ends, the history of mobile communications is investigated, seen as a complex techno-economic system with two rapidly evolving and interacting subsystems - mobile telephony and mobile data communications - which are described, dissected and compared in case studies. LÄS MER

  5. 5. A Mobile Agent Based Service Architecture for Internet Telephony

    Författare :Roch H. Glitho; KTH; []
    Nyckelord :service architecture; mobile agent; SIP; H.323; IN; software upgrading; partitioning; multiparty event scheduling;

    Sammanfattning : Internet Telephony defined as real time voice or multimediacommunications over packet switched networks dates back to theearly days of the Internet. ARPA's Network SecureCommunications project had implemented, as early as December1973, an infrastructure for local and transnet real time voicecommunication. Two main sets of standards have emerged: H. LÄS MER