Now showing items 441-460 of 640

    • HiPerWA: High Performance Wireless Analytics. A survey into the challenges of constructing, managing, debugging and optimizing an in-production large-scale enterprise network 

      Johansen, Bjørn Ludvig Langaas (Master thesis; Mastergradsoppgave, 2016-06-01)
      Enterprise wireless networks are becoming larger and larger, with more and more users and devices connecting to the networks. This requires the infrastructure to be closely monitored and adjusted to ensure an optimum experience for users and their devices. Existing proprietary solutions exist, but are either costly, resource demanding, rigid or may not be able to deliver the functionality that is ...
    • Seadrive. Remote file synchronization for offshore fleets 

      Haro, Peter Halland (Master thesis; Mastergradsoppgave, 2016-06-01)
      File synchronization- and hosting services is not only an integrated service in everyday life, but also a powerful tool to support business and organizational activities. In order to provide users with a transparent experience, the systems relies on sophisticated mechanisms to create a seamless integration. The problem with these systems is that they are designed for stable network connections with ...
    • Capturing High Rate Satellite Data. An Analysis of Lossless, Persistent Reception, Local Storage and Transmission of High Rate Satellite Data From Time Window Based Datastream 

      Mæland, Ruben (Master thesis; Mastergradsoppgave, 2016-05-31)
      Satellites generate data through their instruments as they hover in orbit. Satel- lite data is widely used in weather forecasts, environmental science, for military purposes, earth observation and more. The world depend on satellite data, for many purposes.
    • COMBUSTI/O. Abstractions facilitating parallel execution of programs implementing common I/O patterns in a pipelined fashion as workflows in Spark 

      Fagerli, Jarl (Master thesis; Mastergradsoppgave, 2016-05-31)
      In light of recent years’ exploding data generation in life sciences, increasing downstream analysis capabilities is paramount to address the asymmetry of innovation in data creation contra processing capacities. Many contemporaneously used tools are sequential programs, ofttimes including convoluted dependencies leading to workflows crashing due to misconfiguration, detrimental to both development ...
    • Space-Bounded Async Scheduling : A UPC++ Extension 

      Vik, Christian Bergvoll (Master thesis; Mastergradsoppgave, 2016-06-01)
      As increasing awareness of climate changes and surging power costs for big data centers today energy efficiency becomes increasingly important. In addition to that we carry mobile devices that depend on battery technology that is falling behind the rapid evolution of transistor technology and ever increasing power demands. At the same time there is an understanding that computer resources are not ...
    • AutoMon. Automatic monitoring and problem detection for distributed systems 

      Wikstad, Magnus (Master thesis; Mastergradsoppgave, 2016-05-15)
      When working with distributed systems, detecting faults can be a difficult task, as abnormalities isn't necessarily immediately evident by warnings or system crashes. This is especially true with subtle faults, such as variations in performance of a running program, it is not necessarily its own fault, but could rather be from a different source, somewhere in the cluster, using a lot of resources ...
    • A framework for building scalable web applications for high-resolution cluster-based display walls 

      Tang, Jason (Master thesis; Mastergradsoppgave, 2015-10-06)
      As technology advances, researchers in the natural sciences collect ever-increasing amounts of data. While computer science research often focuses on effective ways to perform computations on large data sets, the visualization of large data sets can be just as important for achieving new insights. Just as cluster computing enables scalable computation on large data sets, so can cluster-based display ...
    • Simplified Device-Transparent Personal Storage 

      Kittilsland, Andreas (Master thesis; Mastergradsoppgave, 2016-05-15)
      The number of personal computers we use every day has increased significantly the last couple of years, where the common model is a setup where each device has its own storage with separate files and applications. This forces the user to think in a certain way about files and applications, where they are to a degree bound to a device unless the user specifically moves the files, or installs/uninstalls ...
    • We.Tree - Connecting young individuals with Type 1 Diabetes Mellitus in rural areas through serious games 

      Sørensen, Mats Christian (Master thesis; Mastergradsoppgave, 2015-12-15)
      Young individuals with chronic diseases living in rural areas might face additional problems in their everyday life compared to those in the same position living closer to the cities. Living far away from friends, relatives, other in the same situation, or even general practitioners and specialists may act as an extra burden in their process through their situation. This project is meant to aid ...
    • Extending the Chrome browser. Adapting browser functionality to user needs and behavior 

      Skogvold, Adrian Arne (Master thesis; Mastergradsoppgave, 2015-11-15)
      What today's browsers offer in customization, personalization and functionality can be improved. In this thesis a application, in the form of a chrome extension that extends a web browser's functionality, and that offers customization and personalization has been designed and implemented. The functions implemented in the extension simplifies the access and availability of information to the user ...
    • Enforcing Privacy Policies with Meta-Code 

      Johansen, Håvard; Birrell, Eleanor; Van Renesse, Robbert; Schneider, Fred B.; Stenhaug, Magnus; Johansen, Dag (Konferansebidrag; Conference object, 2015)
      This paper proposes a mechanism for expressing and enforcing security policies for shared data. Security policies are expressed as stateful meta-code operations; meta-code can express a broad class of policies, including access-based policies, use-based policies, obligations, and sticky policies with declassification. The meta-code is interposed in the filesystem access path to ensure policy ...
    • Lessons learned from 25 years with telemedicine in Northern Norway 

      Hartvigsen, Gunnar; Pedersen, Steinar (Book; Bok, 2015)
    • Appendix E Telemedisinske løsninger i maritime operasjoner og redningstjeneste 

      Woldaregay, Ashenafi Zebene; Hartvigsen, Gunnar; Walderhaug, Ståle (Research report; Forskningsrapport, 2016)
      Folk som jobber i maritime miljø har ikke enkel tilgang til sentrale helsetjenester, og det gjelder spesielt for sjøfolk som arbeider i arktiske områder. Selv om telemedisin har vært en suksess på land, har telemedisin kun i begrenset grad blitt tatt i bruk til havs. Dette skyldes blant annet fravær av gode kommunikasjonsløsninger, dårlige værforhold, store avstander og lange perioder utenfor ...
    • Digital Chronofiles of Life Experience 

      Gurrin, Cathal; Johansen, Håvard; Sødring, Thomas; Johansen, Dag (Chapter; Bokkapittel, 2015-02-28)
      Technology has brought us to the point where we are able to digitally sample life experience in rich multimedia detail, often referred to as lifelogging. In this paper we explore the potential of lifelogging for the digitisation and archiving of life experience into a longitudinal media archive for an individual. We motivate the historical archive potential for rich digital memories, enabling ...
    • Data-intensive computing infrastructure systems for unmodified biological data analysis pipelines 

      Bongo, Lars Ailo; Pedersen, Edvard; Ernstsen, Martin (Journal article; Tidsskriftartikkel; Peer reviewed, 2015-11-18)
      Biological data analysis is typically implemented using a deep pipeline that combines a wide array of tools and databases. These pipelines must scale to very large datasets, and consequently require parallel and distributed computing. It is therefore important to choose a hardware platform and underlying data management and processing systems well suited for processing large datasets. There are many ...
    • Kvik: three-tier data exploration tools for flexible analysis of genomic data in epidemiological studies 

      Fjukstad, Bjørn; Olsen, Karina Standahl; Jareid, Mie; Lund, Eiliv; Bongo, Lars Ailo (Journal article; Tidsskriftartikkel; Peer reviewed, 2015-03-30)
      Kvik is an open-source system that we developed for explorative analysis of functional genomics data from large epidemiological studies. Creating such studies requires a significant amount of time and resources. It is therefore usual to reuse the data from one study for several research projects. Often each project requires implementing new analysis code, integration with specific knowledge bases, ...
    • Description of spatio-temporal gait parameters in elderly people and their association with history of falls: Results of the population-based cross-sectional KORA-Age study 

      Thaler-Kall, Kathrin; Peters, Annette; Thorand, Barbara; Grill, Eva; Autenrieth, Christine S.; Horsch, Alexander; Meisinger, Christa (Journal article; Tidsskriftartikkel; Peer reviewed, 2015-03-25)
      Background: In this epidemiological study we described the characteristics of spatio-temporal gait parameters among a representative, population-based sample of 890 community-dwelling people aged 65 to 90 years. In addition, we investigated the associations between certain gait parameters and a history of falls in study participants. <p>Methods: In descriptive analyses spatio-temporal gait parameters ...
    • Towards Consent-Based Lifelogging in Sport Analytic 

      Johansen, Håvard; Gurrin, Cathal Gerard; Johansen, Dag (Chapter; Bokkapittel, 2015)
      Lifelogging is becoming widely deployed outside the scope of solipsistic self quantification. In elite sport, the ability to utilize these digital footprints of athletes for sport analytic has already become a game changer. This raises privacy concerns regarding both the individual lifelogger and the bystanders inadvertently captured by increasingly ubiquitous sensing devices. This paper describes ...
    • Fireflies: A Secure and Scalable Membership and Gossip Service 

      Johansen, Håvard; Van Renesse, Robbert; Vigfusson, Ymir; Johansen, Dag (Journal article; Tidsskriftartikkel; Peer reviewed, 2015-06)
      An attacker who controls a computer in an overlay network can effectively control the entire overlay network if the mechanism managing membership information can successfully be targeted. This article describes Fireflies, an overlay network protocol that fights such attacks by organizing members in a verifiable pseudorandom structure so that an intruder cannot incorrectly modify the membership views ...
    • DeltaTree: A Locality-aware Concurrent Search Tree 

      Umar, Ibrahim; Anshus, Otto; Ha, Hoai Phuong (Journal article; Tidsskriftartikkel; Peer reviewed, 2015-06-15)
      Like other fundamental abstractions for high-performance computing, search trees need to support both high concurrency and data locality. However, existing locality-aware search trees based on the van Emde Boas layout (vEB-based trees), poorly support concurrent (update) operations. We present DeltaTree, a practical locality-aware concurrent search tree that integrates both locality-optimization ...