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norskFakultet for naturvitenskap og teknologi: Nye registreringer
Viser treff 1221-1240 av 5306
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Technical Viewpoint of Challenges, Opportunities, and Future Directions of Policy Change and Information-Flow in Digital Healthcare Systems
(Chapter; Bokkapittel, 2022)Digital healthcare systems often run on heterogeneous devices in a distributed multi-cluster environment, and maintain their healthcare policies for managing data, securing information flow, and controlling interactions among systems components. As healthcare systems become more digitally distributed, lack of integration and safe interpretation between heterogeneous systems clusters become ... -
The phylogeography and ecology of Oligobrachia frenulate species suggest a generalist chemosynthesis-based fauna in the arctic
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-03-02)We used ancient DNA (aDNA) extraction methods to sequence museum voucher samples of Oligobrachia webbi, a frenulate siboglinid polychaete described from a northern Norwegian fjord over fifty years ago. Our sequencing results indicate a genetic match with the cryptic seep species, Oligobrachia haakonmosbiensis (99% pairwise identity for 574 bp mtCOI fragments). Due to its similarity with O. webbi, ... -
Objective Momentum Barriers in Wall Turbulence
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-04-28)We use the recent frame-indifferent theory of diffusive momentum transport to identify internal barriers in wall-bounded turbulence. Formed by the invariant manifolds of the Laplacian of the velocity field, the barriers block the viscous part of the instantaneous momentum flux in the flow. We employ the level sets of single-trajectory Lagrangian diagnostic tools, the trajectory rotation average ... -
Automatic thumbnail selection for soccer videos using machine learning
(Chapter; Bokkapittel, 2022-08-05)Thumbnail selection is a very important aspect of online sport video presentation, as thumbnails capture the essence of important events, engage viewers, and make video clips attractive to watch. Traditional solutions in the soccer domain for presenting highlight clips of important events such as goals, substitutions, and cards rely on the manual or static selection of thumbnails. However, such ... -
Cartan-Geometric Approaches to Submaximally Symmetric Ordinary Differential Equations
(Doctoral thesis; Doktorgradsavhandling, 2023-04-12)This thesis is concerned with a symmetry classification problem for ordinary differential equations (ODEs) that dates back to Sophus Lie. We focus on higher order ODEs, i.e. scalar ODEs of order greater than or equal to 4 or vector ODEs of order greater than or equal to 3, up to contact transformations. The maximal contact symmetry algebra dimensions for these ODEs are known. We determine for ... -
Modeling Solar Orbiter dust detection rates in the inner heliosphere as a Poisson process
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-02-20)Context. Solar Orbiter provides dust detection capability in the inner heliosphere, but estimating physical properties of detected dust from the collected data is far from straightforward.<p> <p>Aims. First, a physical model for dust collection considering a Poisson process is formulated. Second, it is shown that dust on hyperbolic orbits is responsible for the majority of dust detections with ... -
Predicting Tacrolimus Exposure in Kidney Transplanted Patients Using Machine Learning
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-08-31)Tacrolimus is one of the cornerstone immunosup-pressive drugs in most transplantation centers worldwide following solid organ transplantation. Therapeutic drug monitoring of tacrolimus is necessary in order to avoid rejection of the transplanted organ or severe side effects. However, finding the right dose for a given patient is challenging, even for experienced clinicians. Consequently, a tool that ... -
Spray Icing on ONEGA Vessel- A Comparison of Liquid Water Content Expressions
(Journal article; Tidsskriftartikkel, 2022)The hazards associated with ice accretion primarily due to impinging freezing sea spray on ship structures are considered among serious safety concerns for ships operating in the colder regions. An accurate sea-spray icing-estimation model to evaluate the ice accumulation during operations in these regions can make marine operations safer. The accuracy of the present icing models for estimating icing ... -
DoubleU-Net: A Deep Convolutional Neural Network for Medical Image Segmentation
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-09-01)Semantic image segmentation is the process of labeling each pixel of an image with its corresponding class. An encoder-decoder based approach, like U-Net and its variants, is a popular strategy for solving medical image segmentation tasks. To improve the performance of U-Net on various segmentation tasks, we propose a novel architecture called DoubleU-Net, which is a combination of two U-Net ... -
BacklinkDB: A Purpose-Built Backlink Database Management System
(Master thesis; Mastergradsoppgave, 2023-02-15)In order to compile a list of all the backlinks for a given webpage, we need knowledge about all the outgoing links on the web. Traversing the web and storing all the backlink data in a database allows us to efficiently retrieve the list of backlinks for a web page on demand. However, the web consists of billions of backlinks which translates to terabytes of data. As the web is continuously evolving, ... -
Interactive visualizations of unstructured oceanographic data
(Mastergradsoppgave; Master thesis, 2023-02-15)The newly founded company Oceanbox is creating a novel oceanographic forecasting system to provide oceanography as a service. These services use mathematical models that generate large hydrodynamic data sets as unstructured triangular grids with high-resolution model areas. Oceanbox makes the model results accessible in a web application. New visualizations are needed to accommodate land-masking and ... -
Njord: a fishing trawler dataset
(Chapter; Bokkapittel, 2022-08-05)Fish is one of the main sources of food worldwide. The commercial fishing industry has a lot of different aspects to consider, ranging from sustainability to reporting. The complexity of the domain also attracts a lot of research from different fields like marine biology, fishery sciences, cybernetics, and computer science. In computer science, detection of fishing vessels via for example remote ... -
Collecting health-related research data using consumer-based wireless smart scales
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-03-14)Background: Serious public-health concerns such as overweight and obesity are in many cases caused by excess intake of food combined with decreases in physical activity. Smart scales with wireless data transfer can, together with smart watches and trackers, observe changes in the population’s health. They can present us with a picture of our metabolism, body health, and disease risks. Combining ... -
Computing critical points for invariant algebraic systems
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-10-24) -
Late Holocene pteropod distribution across the base of the south-eastern Mediterranean margin: the importance of the > 63 µm fraction
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-03-17)Euthecosomata pteropods were analysed in core sediments collected in the framework of the 2016 EUROFLEETS2 SEMSEEP cruise, offshore of Israel, in the eastern Mediterranean Sea. The investigated cores were retrieved in a deep-sea coral area at 690 m depth, an actively methane-seeping pockmark area at 1038 m depth, and a deep-sea channel area at 1310 m water depth. We identified and documented the ... -
Optical remote sensing of water quality parameters retrieval in the Barents Sea
(Doctoral thesis; Doktorgradsavhandling, 2023-03-31)<p>This thesis addresses various aspects of monitoring water quality indicators (WQIs) using optical remote sensing technologies. The dynamic nature of aquatic systems necessitate frequent monitoring at high spatial resolution. Machine learning (ML)-based algorithms are becoming increasingly common for these applications. ML algorithms are required to be trained by a significant amount of training ... -
Dating submarine landslides using the transient response of gas hydrate stability
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-03-02)Submarine landslides are prevalent on the modern-day seafloor, yet an elusive problem is constraining the timing of past slope failure. We present a novel age-dating technique based on perturbations to underlying gas hydrate stability caused by slide-impacted seafloor changes. Using three-dimensional (3-D) seismic data, we mapped an irregular bottom simulating reflection (BSR) underneath a submarine ... -
Pleistocene depositional environments and links to cryosphere-ocean interactions on the eastern Ross Sea continental slope, Antarctica (IODP Hole U1525A)
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-10-22)The repeated proximity of West Antarctic Ice Sheet (WAIS) ice to the eastern Ross Sea continental shelf break during past ice age cycles has been inferred to directly influence sedimentary processes occurring on the continental slope, such as turbidity current and debris flow activity; thus, the records of these processes can be used to study the past history of the WAIS. Ross Sea slope sediments ... -
Lean Production – One path to organizational Resilience?
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-11-07)In this indepth singlecase study from a large international aerospace and defence company, we ask the following research question: In what ways does lean production influence organizational resilience? Our findings suggest that various lean practices, such as lean meetings, using lean tools and a lean productioninspired organizational culture promote the development of organizational capabilities ... -
GEO-3144/8144 Teaching Cruise: Geologically controlled hydrocarbon seepage in Hopendjupet and the wider Barents Sea
(Research report; Forskningsrapport, 2022-11-18)The CAGE22-6 cruise on-board R/V Helmer Hanssen hosted UiT´s Arctic Marine Geology and Geophysics (GEO-8144 and GEO-3144) field course for PhD and Master students, and was carried out in collaboration with NPD – the Norwegian Petroleum Directorate and the INTPART project HOTMUD based at Centre for Earth Evolution and Dynamics (CEED) the University of Oslo. The cruise was also a part of the UNESCO ...
