Avancerad sökning

Visar resultat 1 - 5 av 42 avhandlingar som matchar ovanstående sökkriterier.

  1. 1. The human-computer interface in commercial systems : Investigations of dialogue design factors and usability with alphanumeric display terminals

    Författare :Bengt Johnsson; Bertil Andersson; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; administrative process; administrative system; commercial system; controlled experimentation; criteria; design property; display terminal; field investigation; human-computer interface; man-computer dialogue; man-machine matching; terminal user; usability; Information Systems; Informatik;

    Sammanfattning : When terminal based computer systems are incorporated in administrative processes, man-computer interface technology for many reasons becomes a crucial problem area. Terminal users ("terminalists") in such systems account for a vast number of terminal hours. LÄS MER

  3. 2. User Effect Mitigation in MIMO Terminal Antennas

    Författare :Ivaylo Vasilev; Institutionen för elektro- och informationsteknik; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : The rapid growth of cellular technology over the past decade transformed our lives, enabling billions of people to enjoy interactive multimedia content and ubiquitous connectivity through a device that can fit into the palm of a hand. In part the explosive growth of the smartphone market is enabled by innovative antenna system technologies, such as multiple-input multiple-output (MIMO) systems, facilitating high data rates and reliable connections. LÄS MER

  4. 3. Multiple Antenna Terminals in Realistic Environments - A Composite Channel Modeling Approach

    Författare :Fredrik Harrysson; Institutionen för elektro- och informationsteknik; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Channel model; MIMO; multiple antennas terminal; propagation; user interaction; vehicular channel; diversity; spatial multiplexing; channel measurement;

    Sammanfattning : For evaluation of specific antenna arrangements in wireless communication systems we need physical channel models that take into account also the directional domain of the propagation channel. In this thesis we investigate, validate and propose a practical approach to wireless channel modeling and, particularly, to mobile communication systems. LÄS MER

  5. 4. Gammal är äldst : En studie om teknik i äldre människors liv

    Författare :Britt Östlund; Jan-Erik Hagberg; Gunhild Hammarström; Linköpings universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Elderly; Ageing and technology; technology in everyday life; telephone; television; safety alarm; Home Shopping-terminal; user-perspective; INTERDISCIPLINARY RESEARCH AREAS; TVÄRVETENSKAPLIGA FORSKNINGSOMRÅDEN; Äldre; telefon; trygghetslarm; television; handla hemma; vardag; kontext;

    Sammanfattning : This thesis deals with the role of technology in elderly peoples everydaylife, to what extent technology can facilitate or prevent them from havinga social life. The intension is to describe the role of technology from olderpeoples own perspective. LÄS MER

  7. 5. Mobile Antenna Systems for 4G and 5G Applications with User Body Interaction

    Författare :Kun Zhao; Sailing He; Cyril Luxey; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Antenna; MIMO; mmWave; Mobile communication; SAR; Power density; User body effect; Channel modeling; Multiplex efficiency; Electrical Engineering; Elektro- och systemteknik;

    Sammanfattning : In the thesis, the user body effect on antennas in a mobile terminal is discussed. In order to overcome the degradation of Multiple-Input Multiple-Output (MIMO) performance due to the user body effect, a quad-elements MIMO antenna array which can mitigate the body effect through an adaptive antenna switching method is introduced for 4G mobile terminals. LÄS MER