Blar i Department of Mathematics på tittel
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Sammenhenger mellom koder, matroider, grafer og simplisielle komplekser
(Master thesis, 2008)Denne masteroppgaven handler hovedsakelig om å studere sammenhenger mellom ulike em ner innen algebra og kombinatorikk. De matematiske konseptene som studeres, er lineære koder, matroider, grafer og simplisielle komplekser, ... 
Sampling error distribution for the ensemble Kalman filter update step
(Peer reviewed; Journal article, 20110706)In recent years, data assimilation techniques have been applied to an increasingly wider specter of problems. Monte Carlo variants of the Kalman filter, in particular, the ensemble Kalman filter (EnKF), have gained significant ... 
Scene Reconstruction Using Level Sets and Graph Cuts
(Master thesis, 20090717) 
Scroll codes over curves of higher genus
(Peer reviewed; Journal article, 2010)We construct linear codes from scrolls over curves of high genus and study the higher support weights di of these codes. We embed the scroll into projective space Pk1 and calculate bounds for the di by considering the ... 
Segmentation of data traces with applications to dipmeter oil well measurements
(Statistical report no. 18, Research report, 198802) 
Semiparametric model selection for copulas
(Master thesis, 20130603)This thesis will consider the performance of the crossvalidation copula information criterion, xvCIC, in the realm of finite samples. The theory leading to the xvCIC will be outlined, and an analysis will be conducted ... 
Sequential Data Assimilation in High Dimensional Nonlinear Systems
(Doctoral thesis, 20111021)Since its introduction in 1994, the ensemble Kalman filter (EnKF) has gained a lot of attention as a tool for sequential data assimilation in many scientific areas. Due to its computationally fast and easy to implement ... 
Sequential Monte Carlo Methods for Bayesian Filtering
(Master thesis, 2008) 
Sequestration of Carbon in Saline Aquifers Mathematical and Numerical Analysis
(Doctoral thesis, 20040430)The work in this thesis focuses equally on two main topics. The first of these subjects deals with development of criteria for monotonicity of con trol volume methods. These methods are important and frequently used for ... 
Sexual dimorphism in the familial aggregation of tinnitus
(Journal article; Peer reviewed, 202011)Twin and adoption studies point towards a genetic contribution to tinnitus; however, how the genetic risk applies to different forms of tinnitus is poorly understood. Here, we perform a familial aggregation study and ... 
Sigma coordinate pressure gradient errors and the basin problem
(Master thesis, 20100415)This work will focus on how the internal pressure gradient errors affect the numerical instability in idealised ocean basins. The nature of the errors will be investigated and discussed. First, in Chapter 1, the ocean model ... 
Simplified energy landscape for modularity using total variation
(Peer reviewed; Journal article, 2018)Networks capture pairwise interactions between entities and are frequently used in applications such as social networks, food networks, and protein interaction networks, to name a few. Communities, cohesive groups of nodes, ... 
Simplified models for numerical simulation of geological CO2 storage
(Doctoral thesis, 20170203)Carbon capture and storage (CCS) is a proposed strategy to reduce global emissions of greenhousegases. The basic principle is to capture CO2 from power generation or other industrial activities and inject it into deep ... 
Simulating spatial and temporal varying CO2 signals from sources at the seafloor to help designing riskbased monitoring programs
(Peer reviewed; Journal article, 201601)Riskbased monitoring requires quantification of the probability of the design to detect the potentially adverse events. A component in designing the monitoring program will be to predict the varying signal caused by an ... 
A Simulation Study of GoodnessofFit Tests for Binary Regression with Applications to Norwegian Intensive Care Registry Data
(Master thesis, 20190131)When using statistical methods to fit a model, the consensus is that it is possible to represent a complex reality in the form of a simpler model. It is helpful to systematically measure a model’s ability to capture the ... 
A simulation workflow for largescale CO2 storage in the Norwegian North Sea
(Journal article, 201606)Largescale CO2 injection problems have revived the interest in simple models, like percolation and verticallyaveraged models, for simulating fluid flow in reservoirs and aquifers. A series of such models have been collected ... 
Simulations of multibeam sonar echos from schooling individual fish in a quiet environment
(Peer reviewed; Journal article, 201212)A model is developed and demonstrated for simulating echosounder and sonar observations of fish schools with specified shapes and composed of individuals having specified target strengths and behaviors. The model emulates ... 
Simulering av torsk (Gadus Morhua) sin reaksjon på fartøystøy
(Master thesis, 2000) 
A singularity removal method for coupled 1D–3D flow models
(Journal article; Peer reviewed, 2019)In reservoir simulations, the radius of a well is inevitably going to be small compared to the horizontal length scale of the reservoir. For this reason, wells are typically modelled as lowerdimensional sources. In this ... 
Skadebeløpsmodellering i skadeforsikring
(Master thesis, 20090601)I oppgaven modelleres skadegrader for skip med lognormalfordeling og Paretofordeling. I tillegg tar den for seg en ny sammenlått lognormalParetofordeling, og tilpasser de samme dataene til denne fordelingen. Skadegradene ...