Sökning: "Stefan Wallin"

Visar resultat 1 - 5 av 14 avhandlingar innehållade orden Stefan Wallin.

  1. 1. Turbulence modeling of compressible flows with large density variation

    Författare :Igor Grigoriev; Arne Johansson; Stefan Wallin; Geert Brethouwer; Stefan Hickel; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Turbulence; DRSM; EARSM; active scalar; compressible flow; reacting flow; supercritical flow; Engineering Mechanics; Teknisk mekanik;

    Sammanfattning : In this study we highlight the influence of mean dilatation and mean density gradient on the Reynolds stress modeling of compressible, heat-releasing and supercritical turbulent flows.Firstly, the modeling of the rapid pressure-strain correlation has been extended to self-consistently account for the influence of mean dilatation. LÄS MER

  3. 2. Physical Modeling of Protein Folding

    Författare :Stefan Wallin; Beräkningsbiologi och biologisk fysik - Genomgår omorganisation; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; relativity; quantum mechanics; classical mechanics; three-helix bundle; similarity measure; Mathematical and general theoretical physics; protein dynamics; protein folding; two-state; Matematisk och allmän teoretisk fysik; thermodynamics; statistical physics; gravitation; klassisk mekanik; kvantmekanik; relativitet; statistisk fysik; termodynamik; Fysicumarkivet A:2003:Wallin;

    Sammanfattning : Sequence-based models for protein folding are developed and tested on peptides with both alpha- and beta-structure, and on small three-helix-bundle proteins. The interaction potentials of the models are minimalistic and based mainly on hydrogen bonding and effective hydrophobicity forces. LÄS MER

  4. 3. Alarm and service monitoring of large scale multi-service mobile networks

    Författare :Stefan Wallin; Luleå tekniska universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Pervasive Mobile Computing; Distribuerade datorsystem;

    Sammanfattning : Two of the most important challenges in network service assurance are * an overwhelming flow of low-quality alarms * to understand the structure and quality of the delivered services This thesis proposes solutions for alarm and service monitoring that addresses monitoring of large scale multi-service mobile networks. The work on alarms are based on statistical analysis of data collected from a real-world alarm flow and an associated trouble ticket database containing the network administrators expert knowledge. LÄS MER

  5. 4. Engineering turbulence modelling for CFD with a focus on explicit

    Författare :Stefan Wallin; KTH; []
    Nyckelord :;

    Sammanfattning : .... LÄS MER

  7. 5. Rethinking network management solutions : models, data-mining and self-learning

    Författare :Stefan Wallin; Rolf Stadler; Luleå tekniska universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Distribuerade datorsystem; Mobile and Pervasive Computing;

    Sammanfattning : Network service providers are struggling to reduce cost while at the same time improving customer satisfaction. This thesis addresses three relevant underlying challenges to achievieng these goals: - managing an overwhelming flow of low-quality alarms - understanding the structure and quality of the delivered services - automation of service configurationAll of the these add to an operator's operational costs since manual work is required in order to understand the alarm and service status as well as for configuring new services. LÄS MER