• Digital Money Substitutes in a Two Sided Marked Perspective - A Case Study on Bitcoin 

      Malmo, Espen Sunde (Master thesis, 2013)
      In January 2009 a payment system that enabled transactions in a new digital currency, called bitcoin, were launched. Bitcoin is based on a peer-to-peer (P2P) network where users in the network collectively process and ...
    • Evaluating Local Disaster Recovery Strategies 

      Oostenbrink, Jorik; Kuipers, Fernando; Heegaard, Poul Einar; Helvik, Bjarne Emil (Journal article; Peer reviewed, 2018)
    • Evaluating QoS and QoE Dimensions in Adaptive Video Streaming 

      Stensen, Julianne M. G. (Master thesis, 2012)
      The focus of this thesis has been on Quality of Service (QoS) and Qualityof Experience (QoE) dimensions of adaptive video streaming. By carryingout a literature study reviewing the state of the art on QoS andQoE we have ...
    • Exploring the Usefulness of Machine Learning in the Context of WebRTC Performance Estimation 

      Ammar, Doreid; De Moor, Katrien; Skorin-Kapov, Lea; Fiedler, Markus; Heegaard, Poul Einar (Chapter, 2019)
      We address the challenge faced by service providers in monitoring Quality of Experience (QoE) related metrics for WebRTC-based audiovisual communication services. By extracting features from various application-layer ...
    • Field Test of Mobile Terminals in a Wireless City 

      Stray, Petter (Master thesis, 2007)
      A rising question today is whether or not wireless networks and terminals are at the border of being able to compete with the cellular phone service. A variety of terminals are available and citywide wireless networks are ...
    • A Framework for Spatial and Temporal Evaluation of Network Disaster Recovery 

      Gajic, Marija; Heegaard, Poul Einar; Furdek, Marija (Chapter, 2020)
      The support of vital societal functions requires a reliable communication network, especially in the presence of crises and disastrous events. Disasters caused by natural factors including earthquakes, fires, floods or ...
    • From QoS Distributions to QoE Distributions: a System's Perspective 

      Hossfeld, Tobias; Heegaard, Poul Einar; Skorin-Kapov, Lea; Varela, Martin; Fiedler, Markus (Chapter, 2020)
      In the context of QoE management, network and service providers commonly rely on models that map system QoS conditions (e.g., system response time, paket loss, etc.) to estimated end user QoE values. Observable QoS conditions ...
    • Fundamental Relationships for Deriving QoE in Systems 

      Hossfeld, Tobias; Heegaard, Poul Einar; Skorin-Kapov, Lea; Varela, Martin (Chapter, 2019)
      In the context of subjective user studies conducted to derive relationships between influence factors and QoE, user diversity leads to distributions of user scores for test conditions. Such models are commonly exploited ...
    • A Holistic Approach to Dependability Modeling and Analysis of Smart Distribution Grids 

      Zerihun, Tesfaye Amare (Doctoral theses at NTNU;2021:56, Doctoral thesis, 2021)
      Lately, the distribution grid has been under a significant transformation, with a pervasive integration of Information and Communication Technology (ICT) for an enhanced operation and management of the grid. Some of the ...
    • Idol Show in China 

      Draper Gil, Gerard (Master thesis, 2006)
      Our objective is to test the performance of a real SMS Processing System. We will work with Boost Communications, a norwegian company that is developing a SMS Processing System to sell interactive SMS solutions. With our ...
    • Impact of Conversation Task When Testing QoE in WebRTC 

      Haga, Marie (Master thesis, 2018)
      Video conferencing was previously associated with dedicated hardware and professional conferencing systems. The last years applications and services enabling Real-Time Communication with no need for additional software ...
    • Impact of SDN Controllers Deployment on Network Availability 

      Nencioni, Gianfranco; Helvik, Bjarne Emil; Gonzalez, Andres Javier; Heegaard, Poul Einar; Kamisinski, Andrzej (Research report, 2016)
      Software-defined networking (SDN) promises to improve the programmability and flexibility of networks, but it may bring also new challenges that need to be explored. The purpose of this technical report is to assess how ...
    • Implementing and Simulating the Cross-Entropy Ant System 

      Brugge, Jonathan (Master thesis, 2010)
      The Cross-Entropy Ant System (CEAS) has been implemented in ns-3. The implementation has been validated against the latest ns-2 implementation and some extra simulations have been performed. Apart from that, experiences ...
    • Implementing the Availability Model of a Software-Defined Backbone Network in Möbius 

      Nencioni, Gianfranco; Helvik, Bjarne Emil; Heegaard, Poul Einar (Research report, 2017)
      Software-defined networking (SDN) promises to im-prove the programmability and flexibility of networks, but it may bring also new challenges that need to be explored. One open issue is the quantitative ...
    • Including Failure Correlation in Availability Modeling of a Software-Defined Backbone Network 

      Nencioni, Gianfranco; Helvik, Bjarne Emil; Heegaard, Poul Einar (Journal article; Peer reviewed, 2017)
      Software-defined networking (SDN) promises to improve the programmability and flexibility of networks, but also brings new challenges that need to be explored. The main objective of this paper is to include failure correlation ...
    • Information Inconsistencies in Smart Distribution Grids under Different Failure Causes modelled by Stochastic Activity Networks 

      Muka, Romina; Haugli, Fredrik Bakkevig; Vefsnmo, Hanne; Heegaard, Poul Einar (Conference object, 2019)
      The ongoing digitalization of the power distribution grid will improve the operational support and automation which is believed to increase the system reliability. However, in an integrated and interdependent cyber-physical ...
    • Internet Control for Residential Users 

      Cook, Torgeir Pedersen (Master thesis, 2013)
      Internet based services have become an important part of our lives, and broadband access has reached the commodity phase in most developed countries. A growing portion of the time spent on-line among younger Internet users ...
    • Investigating QoE in a Cloud-Based Classroom Response System: A Real-Life Longitudinal and Cross-Sectional Study of Kahoot! 

      Underdal, Anlaug Gårdsrud; Sunde, Marthe Thorine (Master thesis, 2014)
      The goal of this thesis work is to investigate the user-perceived QoE of Kahoot!, a cloud gaming learning platform, designed to be used in classrooms. The general objective of this thesis is to investigate to what extent ...
    • Managed Dependability in Interacting Systems 

      Helvik, Bjarne Emil; Nencioni, Gianfranco; Heegaard, Poul Einar; Wäfler, Jonas (Springer Series in Reliability Engineering;, Chapter; Peer reviewed, 2016)
      AdigitalICTinfrastructuremustbeconsideredasasystemofsystemsin itself, but also in interaction with other critical infrastructures such as water distributions, transportation (e.g. Intelligent Transport Systems) and Smart ...
    • Manufactured by software: SDN-enabled multi-operator composite services with the 5G Exchange 

      Biczok, Gergely; Dramitinos, Manos; Toka, Lazio; Heegaard, Poul Einar; Lønsethagen, Håkon (Journal article; Peer reviewed, 2017)
      Foreseen 5G verticals hold the promise of being true value-added services, hence bringing significant income to their respective providers. However, the nature of these verticals are very demanding in terms of both economic ...