Search for dissertations about: "power 2017"

Showing result 11 - 15 of 361 swedish dissertations containing the words power 2017.

  2. 11. Spectral Efficiency and Fairness Maximization in Full-Duplex Cellular Networks

    Author : Jose Mairton B. da Silva Jr.; Carlo Fischione; Gabor Fodor; Ioannis Krikidis; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; full-duplex; power control; user assignment; cellular networks; fairness; spectral efficiency; Telecommunication; Telekommunikation;

    Abstract : Future cellular networks, the so-called 5G, are expected to provide explosive data volumes and data rates. To meet such a demand, the research communities are investigating new wireless transmission technologies. One of the most promising candidates is in-band full-duplex communications. READ MORE

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

    Author : Kun Zhao; Sailing He; Cyril Luxey; KTH; []
    Keywords : 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;

    Abstract : 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. READ MORE

  5. 13. Mediated Europes : Discourse and Power in Ukraine, Russia and Poland During Euromaidan

    Author : Roman Horbyk; Johan Fornäs; Patrik Åker; Sabina Mihelj; Södertörns högskola; []
    Keywords : SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; HUMANIORA; HUMANITIES; media; discourse; power; postcolonial theory; foreign policy; journalists; politicians; Europe; Ukraine; Russia; Poland; Euromaidan; медії; дискурс; влада; зовнішня політика; журналісти; політики; Европа; Україна; Росія; Евромайдан; medier; diskurs; makt; utrikespolitik; journalister; politiker; Europa; Ukraina; Ryssland; Polen; Euromajdan; Kritisk kulturteori; Critical and Cultural Theory; Östersjö- och Östeuropaforskning; Baltic and East European studies;

    Abstract : This study focuses on mediated representations of Europe during Euromaidan and the subsequent Ukraine–Russia crisis, analysing empirical material from Ukraine, Poland and Russia. The material includes articles from nine newspapers, diverse in terms of political and journalistic orientation, as well as interviews with journalists, foreign policymakers and experts, drawing also on relevant policy documents as well as online and historical sources. READ MORE

  6. 14. Aggregation of Plug-in Electric Vehicles in Power Systems for Primary Frequency Control

    Author : Seyedmahdi Izadkhast; Mehrdad Ghandhari; Garcia-Gonzalez Pablo; Frias Pablo; Ignacio Egido Cortés; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Aggregation; Plug-in Electric Vehicles; Primary Frequency Control; Aggregeren; Plug-in Elektrische Voertuigen; Primaire Reserve; Laddbara Bilar; Elnätet; Primär Frekvensreglering; Agregación; Vehículos Eléctricos Enchufables PEVs ; Control Primario de Frecuencia PFC ; Electrical Engineering; Elektro- och systemteknik;

    Abstract : The number of plug-in electric vehicles (PEVs) is likely to increase in the near future and these vehicles will probably be connected to the electric grid most of the day time. PEVs are interesting options to provide a wide variety of services such as primary frequency control (PFC), because they are able to quickly control their active power using electronic power converters. READ MORE

  7. 15. On Gate Drivers for MOS-Controlled Power Devices and dv-dt Filters for Train Traction Converters

    Author : Erik Velander; Hans-Peter Nee; Francesco Iannuzzo; KTH; []
    Keywords : Power semiconductor devices; DC-AC power converters; Silicon carbide; Insulated gate bipolar transistors; P-i-n diodes; Schottky diodes; Traction motors; Power MOSFET; Krafthalvledare; DC-AC kraftomvandlare; kiselkarbid; IGBT; P-i-n dioder; Schottky dioder; traktionsmotorer; Effekt-MOSFET; Electrical Engineering; Elektro- och systemteknik;

    Abstract : In this thesis, low-loss gate-drive solutions and a proposed dv/dt-filter have been investigated with focus on train traction converters with dv/dt constraints.By using the silicon carbide (SiC) junction field-effect transistor (JFET), the switching losses can be significantly reduced compared to the commonly used insulated-gate bipolar transistor (IGBT), but complex gate-driver solutions are required for high utilization in terms of loss reduction. READ MORE