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Multiscale Methods for Statistical Inference on Regular Lattice Data
(Doctoral thesis; Doktorgradsavhandling, 2013-12-13)This thesis presents methods for multiscale statistical inference on random fields on a regular two-dimensional lattice. There are two distinct concepts of scale that are used in the thesis. The first one is connected to the computer vision community's understanding of scale-space as a family of smooths of a digital image, with fine structure being revealed at low levels of smoothing and the coarser ... -
A Multiscale Wavelet-Based Test for Isotropy of Random Fields on a Regular Lattice
(Journal article; Tidsskriftartikkel; Peer reviewed, 2014-12-31)A test for isotropy of images modeled as stationary or intrinsically stationary random fields on a lattice is developed. The test is based on wavelet theory, and can operate on the horizontal and vertical scale of choice, or on any combination of scales. Scale is introduced through the wavelet variances (sometimes referred to as the wavelet power spectrum), which decompose the variance over ... -
Multiscaling Differential Contraction Integral Method for Inverse Scattering Problems with Inhomogeneous Media
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-03-10)Practical applications of microwave imaging often require the solution of inverse scattering problems with inhomogeneous backgrounds. Toward this end, a novel inversion strategy, which combines the multiscaling (MS) regularization scheme and the difference contraction integral equation (DCIE) formulation, is proposed. Such an integrated approach mitigates the nonlinearity and the ill-posedness of ... -
A Multisensor Comparison of Experimental Oil Spills in Polarimetric SAR for High Wind Conditions
(Peer reviewed; Journal article; Tidsskriftsartikkel, 2016-06-23)In this paper, we present the experimental setup and data collection during the Norwegian Radar oil Spill Experiment 2015, followed by a comparison of a subset of the multisensory synthetic aperture radar (SAR) imagery collected during the experiment. Multipolarization SAR data acquired by Radarsat-2, TerraSAR-X, and the uninhabited aerial vehicle synthetic aperture radar (UAVSAR) less than 6 min ... -
Multisensor video magnification
(Master thesis; Mastergradsoppgave, 2017-06-13)This study was performed with the three main goals. The first of which includes the implementation of “Eulerian Video Magnification” for the normal videos to observe the subtle changes that cannot be seen through the naked eyes. The second goal was to implement interpolation on thermal infrared videos. Finally, the third goal is to combine both the videos to amplify complex variations to reveal ... -
MultiSEPT - Full scale tests of the semicircular spreading gear (SCSG)
(Research report; Forskningsrapport, 2013-06-24)This reportdescribes full scale tests at sea with the semi-circular spreading gear (SCSG). This activity is part of Work Package 3 (WP3: Development of new ground gear) of the MultiSEPT project. The spreading of the SCSG and rockhopper gear was measured by useof MARPORT distance sensors. Bottom contact was monitored by use of SCANMARtrawl sensors and by underwater cameras mounted in the headline ... -
Multisite musculoskeletal pain in adolescence and later mental health disorders: a population-based registry study of Norwegian youth: the NAAHS cohort study
(Journal article; Tidsskriftartikkel; Peer reviewed, 2017-02-01)<b>Objectives:</b> To examine the association between multisite musculoskeletal pain in adolescence and mental health disorders in young adulthood. <br><b>Design and setting: </b>Data were obtained from a linkage between the Norwegian Patient Registry (2008 – 2012) and the Norwegian Arctic Adolescent Health Study, a school-based survey conducted among 10th grade students in North Norway (2003 – ... -
Multisite musculoskeletal pain in adolescence. The relationship with psychosocial problems, mental health and later welfare benefit receipt
(Doctoral thesis; Doktorgradsavhandling, 2016-08-17)Pain is common in otherwise healthy youth and is often associated with psychosocial problems. However, there is limited knowledge of how pain-troubled adolescents fare from adolescence into young adulthood. To examine this, the Norwegian Arctic Adolescent Health Study, a 10th grade school-based survey (15–16-year-olds) conducted in North Norway, in 2003–2005, was linked to the Norwegian Patient ... -
Multisite musculoskeletal pain, self-harm and suicidal behaviour in Northern Norwegian adolescents: a population-based study
(Master thesis; Mastergradsoppgave, 2020-08-31)<p><i>Background:</i> Self-harm and suicidal behaviour commonly debuts and increases during adolescence. Suicidal behaviour is a major public health concern and is associated with later suicidal behaviour, mental health disorders and poor functioning in adulthood. Musculoskeletal pain also increases during adolescence and multisite pain is associated with increased disability and psychosocial problems. ... -
Multisite Replication in Second Language Acquisition Research: Attention to Form During Listening and Reading Comprehension
(Journal article; Tidsskriftartikkel; Peer reviewed, 2018-05-24)We conducted a multisite replication study with aspects of preregistration in order to explore the feasibility of such an approach in second language (L2) research. To this end, we addressed open questions in a line of research that has examined whether having learners attend to form while reading or listening to a L2 passage interferes with comprehension. Our results are consistent with findings ... -
MultiStage: Acting across Distance
(Conference object; Konferansebidrag, 2013)We report on a prototype system helping actors on a stage to interact and perform with actors on other stages as if they were on the same stage. At each stage four 3D cameras tiled back to back for an almost 360 degree view, continuously record actors. The system processes the recorded data on-the-fly to discover actions by actors that it should react to, and it streams data about actors and their ... -
Multistatic Specular Meteor Radar Network in Peru: System Description and Initial Results
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-12-10)The mesosphere and lower thermosphere (MLT) region is dominated globally by dynamics at various scales: planetary waves, tides, gravity waves, and stratified turbulence. The latter two can coexist and be significant at horizontal scales less than 500 km, scales that are difficult to measure. This study presents a recently deployed multistatic specular meteor radar system, SIMONe Peru, which can be ... -
Multitemporal Analysis of Multipolarization Synthetic Aperture Radar Images for Robust Surface Change Detection
(Doctoral thesis; Doktorgradsavhandling, 2013-06-07)This thesis addresses two approaches for change detection from multipolarization, multilooked SAR images: a post-classification comparison and a direct change detection. We consider the complete workflow associated with performing post-classification change detection from time series of multipolarization SAR (PolSAR) images acquired with different imaging geometries and polarimetric configurations. ... -
Multitemporal Sentinel-1 and Sentinel-2 Images for Characterization and Discrimination of Young Forest Stands Under Regeneration in Norway
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-04-15)There is a need for mapping of forest areas with young stands under regeneration in Norway, as a basis for conducting tending, or precommercial thinning (PCT), whenever necessary. The main objective of this article is to show the potential of multitemporal Sentinel-1 (S-1) and Sentinel-2 (S-2) data for characterization and detection of forest stands under regeneration. We identify the most powerful ... -
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A Multitexture Model for Multilook Polarimetric Synthetic Aperture Radar Data
(Journal article; Tidsskriftartikkel; Peer reviewed, 2013)A statistical model for multilook polarimetric radar data is presented where the polarimetric channels are associated with individual texture variables having potentially different statistical properties. The feasibility of producing closed form probability density functions under certain restrictions is outlined. Mellin kind statistics are derived under various assumptions on the texture variables, ... -
Multivariate analysis of Co, Fe and Ni leaching from tailings following simulated temperature change
(Journal article; Peer reviewed, 2018)A series of column leaching experiments were performed to understand the leaching behavior of Co, Fe and Ni in Ballangen mine tailings. Multivariate statistical approaches to evaluate potential risk variations in leachate quality and identifies temperature effects on their leaching behavior. Results from column leaching test indicated that the mobility of showed higher temperature may encourage ... -
Multivariate methods for evaluating the efficiency of electrodialytic removal of heavy metals from polluted harbour sediments
(Journal article; Tidsskriftartikkel; Peer reviewed, 2015-02-11)Chemometrics was used to develop a multivariate model based on 46 previously reported electrodialytic remediation experiments (EDR) of five different harbour sediments. The model predicted final concentrations of Cd, Cu, Pb and Zn as a function of current density, remediation time, stirring rate, dry/wet sediment, cell set-up as well as sediment properties. Evaluation of the model showed that ... -
The Multivariate Normal Inverse Gaussian distribution: EM-estimation and analysis of synthetic aperture sonar data
(Journal article; Tidsskriftartikkel; Peer reviewed, 2004-09)The heavy-tailed Multivariate Normal Inverse Gaussian (MNIG) distribution is a recent variance-mean mixture of a multivariate Gaussian with a univariate inverse Gaussian distribution. Due to the complexity of the likelihood function, parameter estimation by direct maximization is exceedingly difficult. To overcome this problem, we propose a fast and accurate multivariate ExpectationMaximization (EM) ... -
Multiwavelength observations revealing the outbursts of the two soft X-ray transients XTE J1859+226 and XTE J1118+480
(Conference object; Konferansebidrag, 2001-02-06)We report here on multiwavelength observations of the two new soft X-ray transients (SXTs) XTE J1859+226 and XTE J1118+480, which we observed with HST/RXTE/UKIRT. For XTE J1118+480 we also used EUVE since it is located at a very high galactic latitude and suffers from very low extinction. The two sources exhibited very different behaviour. XTE J1859+226 seems quite normal and therefore a good ...