Search for dissertations about: "Hans Johannesson"

Showing result 1 - 5 of 7 swedish dissertations containing the words Hans Johannesson.

  2. 1. On the optimization of hydraulic cylinder seals

    Author : Hans Johannesson; Luleå tekniska universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Maskinelement; Machine Elements;

    Abstract : .... READ MORE

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

    Author : Daniel Johannesson; Hans-Peter Nee; Staffan Norrga; Muhammad Nawaz; Alberto Castellazzi; KTH; []
    Keywords : 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;

    Abstract : 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. READ MORE

  5. 3. Multi-terminal HVDC protections based on transient line modeling

    Author : Niclas Johannesson; Staffan Norrga; Hans-Peter Nee; Jef Berteen; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; HVDC transmission; HVDC protection; traveling wave protection; MTDC protection; Electrical Engineering; Elektro- och systemteknik;

    Abstract : High voltage direct current (HVDC) is considered one of the critical technologies required for the power system to enable the transition toward renewables. With an increasing geographical density of HVDC converters, there is a potential for optimization by connecting more than two converters into a shared DC transmission system, thus forming a multi-terminal HVDC (MTDC) system. READ MORE

  6. 4. Business Innovation by utilizing Engineering Design Theory and Methodology

    Author : Leif Clausson; Gunnar Sohlenius; Hans Johannesson; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Business Modeling; Product Platform Development; Product Life Cycle Modeling; Product Structuring; Innovation Methods; Integrated Design; Industrial engineering and economy; Industriell teknik och ekonomi;

    Abstract : Industrial companies that carry on innovation and operation must have well-organized and capable business systems and processes. Customer needs, market demands, global competition and technological changes drive the companies to be more adaptable, flexible and dynamic. READ MORE

  7. 5. A Unified Framework for e-Commerce Systems Development : Business Process Pattern Perspective

    Author : Prasad M. Jayaweera; Paul Johannesson; Hans Weigand; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; e-Commerce; Business Model; Process Model; UMM UN CEFACT’s Modeling Methodology ; BPMN Business Process Modeling Notation ; Speech Acts; REA Ontology Resource-Event-Agent Ontology ; Enterprise Modeling Ontology; ebXML Electronic Business using eXtensible Markup Language ; Business Collaboration; Computer science; Datavetenskap;

    Abstract : In electronic commerce, systems development is based on two fundamental types of models, business models and process models. A business model is concerned with value exchanges among business partners, while a process model focuses on operational and procedural aspects of business communication. READ MORE