Fakultet for naturvitenskap og teknologi: Recent submissions
Now showing items 1-20 of 5035
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Flymedisinsk sertifisering av mental skikkethet
(Master thesis; Mastergradsoppgave, 2024-08-19)Denne studien handler om den rutinemessige flymedisinske kontrollundersøkelsen av mental skikkethet hos søkere til legeattest klasse 1. Flyleger har en viktig funksjon ved å være ansvarlig for å vurdere «flygeres flymedisinske skikkethet i lys av fremtidig funksjonssvikt under flygning» (Luftfartstilsynet, 2023c, s. 3). Flylegers funksjon og rammebetingelser for å praktisere flymedisin er definert ... -
Assessing climate-induced risks to urban railway infrastructure
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-07-14)Climate change and its severe impacts pose a number of challenges to transport infrastructure, particularly railway infrastructure, requiring immediate action. A railway system is a linear distributed asset passing different geographical locations and exposed to heterogeneous vulnerabilities under diverse environmental conditions. Furthermore, most of the railway infrastructure assets were designed ... -
A survey related to current technologies in Arctic region for autonomous driving
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-09-28)Autonomous driving has sparked an entire revolution in the vehicle sector, offering to increase the safety for road users, productivity, and convenience. However, using autonomous driving vehicles in hostile environments like the Arctic present’s challenges because of the bad weather, lack of infrastructure, rough terrain, poor vision, icy and unreliable road surfaces, and inaccessible locations. ... -
Fitting to magnetic forces improves the reliability of magnetic Moment Tensor Potentials
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-08-29)We developed a method for fitting machine-learning interatomic potentials with magnetic degrees of freedom, namely, magnetic Moment Tensor Potentials (mMTP). The main feature of our method consists in fitting mMTP to magnetic forces (negative derivatives of energies with respect to magnetic moments) as obtained spin-polarized density functional theory calculations. We test our method on the bcc Fe–Al ... -
Breast Cancer Detection and Analytics Using Hybrid CNN and Extreme Learning Machine
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-07-26)Early detection of breast cancer is essential for increasing survival rates, as it is one of the primary causes of death for women globally. Mammograms are extensively used by physicians for diagnosis, but selecting appropriate algorithms for image enhancement, segmentation, feature extraction, and classification remains a significant research challenge. This paper presents a computer-aided diagnosis ... -
Roadmap on computational methods in optical imaging and holography [invited]
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-08-29)Computational methods have been established as cornerstones in optical imaging and holography in recent years. Every year, the dependence of optical imaging and holography on computational methods is increasing significantly to the extent that optical methods and components are being completely and efficiently replaced with computational methods at low cost. This roadmap reviews the current scenario ... -
Maritime Object Detection by Exploiting Electro-Optical and Near-Infrared Sensors Using Ensemble Learning
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-09-11)Object detection in maritime environments is a challenging problem because of the continuously changing background and moving objects resulting in shearing, occlusion, noise, etc. Unluckily, this problem is of critical importance since such failure may result in significant loss of human lives and economic loss. The available object detection methods rely on radar and sonar sensors. Even with the ... -
Characterizing the consistency of motion of spermatozoa through nanoscale motion tracing
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-07-06)Objective: To demonstrate nanoscale motion tracing of spermatozoa and present analysis of the motion traces to characterize the consistency of motion of spermatozoa as a complement to progressive motility analysis.<p> <p>Design: Anonymized sperm samples were videographed under a quantitative phase microscope, followed by generating and analyzing superresolution motion traces of individual ... -
Neogene - Quaternary evolution of the northeastern Fram gateway, European Arctic
(Conference object; Konferansebidrag, 2024-10) -
Adaptive Kalman Filter-based Estimator with Sea Trail Data to Calculate Ship States in Complex Navigation Conditions
(Chapter; Bokkapittel, 2024)With the progress of innovative technologies, ships in future with different autonomy levels are anticipated to enter the realm of maritime transportation. As a result, the scenarios of multi-ship encounters at sea can become more complex and the risk of potential collisions can be difficult to elevate. To support navigation safety and guarantee the required situation awareness level, it is ... -
Operational support framework for maritime autonomous surface ships under onshore operation centers
(Chapter; Bokkapittel, 2024-05-08)In recent years, the concept of Maritime Autonomous Surface Ships (MASSs) has gotten attention both from the research community and shipping industry. The recent development in advanced sensing, communication, and control technologies makes it possible to operate such vessels remotely through Onshore Operation Centers (OOCs). However, there are still several challenges that need to be addressed ... -
Navigational support framework for maritime autonomous surface ships under onshore operation centers
(Chapter; Bokkapittel, 2024-05-08)To navigate, Maritime Autonomous Surface Ships (MASSs) must be able to determine their states. i.e., the positions and velocities, etc., by utilizing onboard IoT, and ship intelligence systems. Autonomous ship navigation can heavily rely on machine learning algorithms that can predict how vessels will maneuver in the future, based on past behavior, where vessel state estimation can play a main role. ... -
Functional Requirements for Onshore Operation Centers to Support Remotely Operated Ships
(Chapter; Bokkapittel, 2024-06-16)Autonomous shipping has received extensive attention from the maritime industry as well as the respective research, academic and training institutes, owing to its major benefits related to cost and safety over traditional shipping in many situations. In reality, the implementation of autonomous technology in shipping can face numerous challenges from the technology and regulatory perspectives. ... -
Study of Maritime Autonomous Surface Ships (MASS) Trustworthiness: Hardware Point of View
(Chapter; Bokkapittel, 2024-06-16)Nowadays, the maritime industry, like other industries, is incorporating Machine Learning (ML) and Artificial Intelligence (AI) approaches in their applications. Since the rise of Maritime Autonomous Surface Ships (MASS) is on the horizon, such intelligent algorithms would replace conventional ship navigation with a higher level of autonomy. In other words, a digital navigator can be developed based ... -
Skibotn Astrofysiske Observatorium. Et forsøk på å innføre observasjonsastrofysikk i Norge 1971 - 2002 - Og hvordan det gikk etterpå.
(Book; Bok, 2024)I forbindelse med etableringen av Universitetet i Tromsø ble det undersøkt om det var gode nok forhold for infrarøde astrofysiske observasjoner i lange, kalde vinternetter i Indre Troms. Mest klarvær om vinteren fant vi i ytre del av Skibotndalen. Fjellet Addjet (1405 m.o.h) ble i 1974 foreslått som sted for observatorium. Dette ble imidlertid vurdert for krevende og kostbart. Det ble i stedet vedtatt ... -
An evolution in sustainable development: Integrating new semi-quantitative assessment model with strategic management (Insights from the mineral sector)
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-10-18)Sustainable development is crucial for ensuring the future of the environment, humanity, and industries. As a result, researchers across various disciplines have sought to expand sustainable practices within their fields. Since its introduction in 1992, sustainable development has made significant progress. Numerous models have been developed to assess sustainable development levels, with ... -
Arctic freshwater outflow suppressed Nordic Seas overturning and oceanic heat transport during the Last Interglacial
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-10-27)The Last Interglacial period (LIG) was characterized by a long-term Arctic atmospheric warming above the preindustrial level. The LIG thus provides a case study of Arctic feedback mechanisms of the cryosphere-ocean circulation-climate system under warm climatic conditions. Previous studies suggested a delay in the LIG peak warming in the North Atlantic compared to the Southern Ocean and evoked the ... -
The effect of spatial resolution on the in-cloud atmospheric icing conditions in numerical weather model at the Fargernes mountain, Norway
(Chapter; Bokkapittel, 2024-06)Atmospheric icing poses significant risks to infrastructure, aviation, and the energy section. Numerical weather models, as the Weather Research and Forecasting model (WRF), can be used to describe the atmospheric conditions relevant for atmospheric icing. In this study, we will focus on the Fagernes mountain meteorological icing measurement site where the WRF model is set up using ERA5 input data, ... -
Atmospheric In-cloud Icing Using WRF for an Alpine Wind Power Plant in Norway
(Chapter; Bokkapittel, 2024-06)Troms Kraft have identified a location in Kvænangen, Norway, for a new wind power plant with promising wind resources. However, the site is in an arctic climate with mountainous terrain exposed to severe icing conditions. Assessments of icing conditions at proposed locations for new wind power plants in areas exposed to icing is crucial to identifying icing related challenges. This paper investigates ... -
A Peridynamic Approach to Simulate Sea Ice Fracture with a Focus on its time-dependent material behaviour
(Chapter; Bokkapittel, 2024)Sea ice exhibits time-dependent non-linear behaviour. This is evidenced by both lab and field experiments with known phenomena such as creep and stress relaxation. This time-dependent material behaviour becomes particularly pronounced at larger temporal scales. In this study, we present a novel approach to simulate time-dependent fractures in sea ice using peridynamics (PD), a particle integral ...