Sökning: "Device"

Visar resultat 6 - 10 av 2115 avhandlingar innehållade ordet Device.

  1. 6. Microwave power device characterization

    Författare :Kristoffer Andersson; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; statistical estimation; self-heating; Silicon Carbide; Gallium Nitride; mixer; thermal resistance; wide bandgap; microwave; error-correction; small-signalmodel;

    Sammanfattning : The first part of the thesis covers work done on device characterizationmethods. A statistical method for estimating small-signal model parametersin FET-models was proposed. A maximum likelihood estimator wasderived and the new method was compared to a standard direct extractiontechnique. LÄS MER

  3. 7. Long-Wavelength Vertical-Cavity Lasers : Materials and Device Analysis

    Författare :Sebastian Mogg; KTH; []
    Nyckelord :VCL; VCSEL; vertical-cavity laser; semiconductor laser; long-wavelength; DBR; characterization; analysis; InP; InGaAs; quantum well; numerical modeling;

    Sammanfattning : Vertical-cavity lasers (VCLs) are of great interest as lightsources for fiber-optic communication systems. Such deviceshave a number of advantages over traditional in-plane laserdiodes, including low power consumption, efficient fibercoupling, on-chip testability, as well as potential low-costfabrication and packaging. LÄS MER

  4. 8. Ultrahigh-Voltage Silicon Carbide Device Performance, Requirements, and Limitations in High-Power Applications

    Författare :Daniel Johannesson; Hans-Peter Nee; Staffan Norrga; Muhammad Nawaz; Alberto Castellazzi; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; 4H-SiC; Current Filamentation; Device Characterization; Dynamic Avalanche; JTE Structure; Junction Termination Extension Design; SiC BJT; SiC GTO Thyristor; SiC IGBT; SiC MOSFET; SiC PiN Diode; Silicon Carbide; TCAD Simulation; Wide bandgap device; Electrical Engineering; Elektro- och systemteknik;

    Sammanfattning : The increased awareness of the on-going climate change accelerates the electric energy system transformation from fossil-fueled power sources towards systems with larger portions of renewable energy sources. Moreover, the grid infrastructure requires reinforcements to cope with increasing electrical energy demand. LÄS MER

  5. 9. Managing information security for mobile devices in small and medium-sized enterprises : Information management, Information security management, mobile device

    Författare :Martin Brodin; Jeremy Rose; Rose-Mharie Åhlfeldt; Stewart Kowalski; Miko Siponen; Högskolan i Skövde; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Information management; Information security management; mobile device; Information Systems; Informationssystem IS ;

    Sammanfattning : The rapid proliferation of mobile devices makes mobile security a weak point in many organisations’ security management. Though there are a number of frameworks and methods available for improving security management, few of these target mobile devices, and most are designed for large organisations. LÄS MER

  7. 10. Design and Implementation of Multi-Device Services

    Författare :Stina Nylander; Bengt Sandblad; Annika Waern; Anind K. Dey; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Human-Computer Interaction; Mobile Computing; Multi-Device Services; Information technology; Informationsteknologi;

    Sammanfattning : We present a method for developing multi-device services which allows for the creation of services that are adapted to a wide range of devices. Users have a wide selection of electronic services at their disposal such as shopping, banking, gaming, and messaging. LÄS MER