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norskArtikler, rapporter og annet (informatikk): Nye registreringer
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Access control protocol with node privacy in wireless sensor networks
(Journal article; Tidsskriftartikkel; Peer reviewed, 2016-11-15)For preventing malicious nodes joining wireless sensor networks (WSNs), an access control mechanism is necessary for the trustworthy cooperation between the nodes. In addition to access control, recently, privacy has been an important topic regarding how to achieve privacy without disclosing the real identity of communicating entities in the WSNs. Based on elliptic curve cryptography, in this paper, ... -
Secure and scalable statistical computation of questionnaire data in R
(Journal article; Tidsskriftartikkel; Peer reviewed, 2016-08-12)Collecting data via a questionnaire and analyzing them while preserving respondents' privacy may increase the number of respondents and the truthfulness of their responses. It may also reduce the systematic differences between respondents and non-respondents. In this paper, we propose a privacy- preserving method for collecting and analyzing survey responses using secure multi-party computation. The ... -
Implementing and optimizing a Sparse Matrix-Vector Multiplication with UPC
(Research report; Forskningsrapport, 2016)Programmability and performance-per-watt are the major challenges of the race to Exascale. In this study we focus on Partitioned Global Address Space (PGAS) languages, using UPC as a particular example. This category of parallel languages provides ease of programming as a strong advantage over the classic Message Passing Interface(MPI). PGAS has also advantages compared to classic shared memory ... -
Enforcing Privacy Policies with Meta-Code
(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
(Book; Bok, 2015) -
Appendix E Telemedisinske løsninger i maritime operasjoner og redningstjeneste
(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
(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
(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
(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
(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
(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
(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
(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 ... -
Naturvitenskapens grunnlag og begrensning. Seminarrapport
(Research report; Forskningsrapport, 1979)Foredrag av Arthur E. Wilder-Smith og Udo Middelmann holdt ved NTH i 1979 -
Evaluation of the power efficiency of UPC, OpenMP and MPI
(Research report; Forskningsrapport, 2015)In this study we compare the performance and power efficiency of Unified Parallel C (UPC), MPI and OpenMP by running a set of kernels from the NAS Benchmark. One of the goals of this study is to focus on the Partitioned Global Address Space (PGAS) model, in order to describe it and compare it to MPI and OpenMP. In particular we consider the power effi- ciency expressed in millions operations ... -
Transparent Incremental Updates for Genomics Data Analysis Pipelines
(Chapter; Bokkapittel, 2014) -
Exploring patterns of accelerometry-assessed physical activity in elderly people
(Journal article; Tidsskriftartikkel; Peer reviewed, 2014) -
Digital Chronofiles of Life Experience
(Journal article; Tidsskriftartikkel; Peer reviewed, 2015) -
Embarrassingly Distributed Computing for Symbiotic Weather Forecasts
(Journal article; Tidsskriftartikkel; Peer reviewed, 2013) -
A Mobile Health Intervention for Self-Management and Lifestyle Change for Persons With Type 2 Diabetes, Part 2: One-Year Results From the Norwegian Randomized Controlled Trial RENEWING HEALTH
(Journal article; Tidsskriftartikkel; Peer reviewed, 2014)
