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Now showing items 101-200 of 226
(Master thesis / Masteroppgave, 2022)
Exploring laboratory testing of radar jamming techniques Restricted Access
(Master thesis / Masteroppgave, 2023)
Design and evaluation of a Lift-Augmented Quadcopter Restricted Access
(Master thesis / Masteroppgave, 2022)
Small multirotor Unmanned Aerial Vehicles (UAVs) have the last decades become popular in many areas because of their simple design, low cost, and ease of use. Multirotor UAVs are simple to operate because of their Vertical ...
(Master thesis / Masteroppgave, 2021)
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2022)
Energy system models underpin decisions by energy system planners and operators. Energy system modeling faces a transformation: accounting for changing meteorological conditions imposed by climate change. To enable that ...
(Master thesis / Masteroppgave, 2023)
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
Reanalysis data are widely used for simulating renewable energy and in particular wind power generation. While MERRA-2 has been a de-facto standard in many studies for a long time, the newer ERA5-reanalysis recently gained ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
Abstract
Hydrides based on magnesium and intermetallic compounds provide a viable solution to the challenge of energy storage from renewable sources, thanks to their ability to absorb and desorb hydrogen in a ...
(Chapter / Bokkapittel / AcceptedVersion; Peer reviewed, 2022)
Providing full autonomy to Unmanned Surface Vehicles (USV) is a challenging goal to achieve. Autonomous docking is a subtask that is particularly difficult. The vessel has to distinguish between obstacles and the dock, and ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
Norway, a significant petroleum producer and exporter, has been a frontrunner within policies for carbon capture and storage (CCS). As CCS is recognized as a key technology for achieving the Paris climate policy targets, ...
(Master thesis / Masteroppgave, 2023)
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
Floating photovoltaic (FPV) systems are an emerging and increasingly competitive application of solar PV, especially in land area-constrained countries. This study focuses on the optimal dimensioning and scheduling of a ...
(Master thesis / Masteroppgave, 2023)
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
This work presents simulation results from a system where offshore wind power is used to produce hydrogen via electrolysis. Real-world data from a 2.3 MW floating offshore wind turbine and electricity price data from Nord ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
Abstract We establish motivic versions of the theorems of Lin and Gunawardena, thereby confirming the motivic Segal conjecture for the algebraic group of th roots of unity, where is any prime. To achieve this we develop ...
(Doctoral thesis / Doktoravhandling, 2024)
In the global effort to combat climate change, wind energy is of paramount importance in transitioning away from fossil fuels. But wind power comes with a challenge: it's not always blowing when we need it. That's where ...
(Master thesis / Masteroppgave, 2023)
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
Due to the market gate closures in the Nordic energy markets, producers with variable renewable energy (VRE) assets, e.g., PV and wind power plants, must forecast their production prior to delivery, leaving room for ...
(Master thesis / Masteroppgave, 2023)
I denne oppgaven har vi foreslått et system for autonom deteksjon av trygge landingsplasser. Systemet er basert på visuell navigasjon og tett dybdeestimering. Systemet bruker tett normalestimering på dybdebildene for å ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
The Industrial Internet of Things (IIoT) requires wireless connectivity that meets the strict industrial requirements on metrics such as reliability and latency. Promising approaches include Time Slotted Channel Hopping ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
Abstract Reward tampering is a problem that will impact the trustworthiness of the powerful AI systems of the future. Reward Tampering describes the problem where AI agents bypass their intended objective, enabling unintended ...
(Chapter / Bokkapittel / PublishedVersion; Peer reviewed, 2023)
A striking difference between animals and traditional robots is that the latter usually have rigid and non-flexible bodies. Animals, on the other hand, exhibit highly adapted traits, such as elastic tendons. The tendons ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
Exact single photons cannot be generated on demand due to their infinite tails. To quantify how close realizable optical states can be to some target single photon in one dimension, we argue that there are two natural but ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
The first samples collected by the Mars 2020 mission represent units exposed on the Jezero Crater floor, from the potentially oldest Séítah formation outcrops to the potentially youngest rocks of the heavily cratered Máaz ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
In situ geologic context mapping based on rover and helicopter observations provides documentation of a nearly continuous record of geology and exposed surface structure over a 120 m-wide corridor along the traverse of the ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2024)
Pairwise preference information, which involves users expressing their preferences by comparing items, plays a crucial role in decision-making and has recently found application in recommendation systems. In this study, ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
With the rapid adoption of wind energy globally, there is a need for accurate short-term forecasting systems to improve the reliability and integration of such energy resources on a large scale. While most spatio-temporal ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
The Industrial Internet of Things needs wireless communication with bounded latency and stronger robustness. Nodes employing the Time Slotted Channel Hopping (TSCH) MAC operate according to a schedule, and recent work on ...
(Chapter / Bokkapittel / AcceptedVersion; Peer reviewed, 2023)
State representation learning aims to capture latent factors of an environment. Although some researchers realize the connections between masked image modeling and contrastive representation learning, the effort is focused ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2024)
The field of visual object tracking is dominated by methods that combine simple tracking algorithms and ad hoc schemes. Probabilistic tracking algorithms, which are leading in other fields, are surprisingly absent from the ...
(Journal article / Tidsskriftartikkel / SubmittedVersion, 2022)
We develop a logic-based approach for designing simulation-based training scenarios. Our methodology embodies a concise definition of the scenario concept and integrates the notions of training goals, acceptable versus ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2021)
Inertial navigation of pedestrians carrying a smart device is a core component of many indoor positioning systems. While infrastructure-based solutions typically depend on an installation of dedicated hardware, inertial ...
GPS timing interference - Building a setup for evaluating the effect of jamming and spoofing on GPS based timing devices Restricted Access
(Master thesis / Masteroppgave, 2021)
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
Video conferencing services based on web real-time communication (WebRTC) protocol are growing in popularity among Internet users as multi-platform solutions enabling interactive communication from anywhere, especially ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
Single-photon pulses cannot be generated on demand, due to incompatible requirements of positive frequencies and positive times. Resulting states therefore contain small probabilities for multiphotons. We derive upper and ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
Video on demand (VoD) services such as YouTube have generated considerable volumes of Internet traffic in homes and buildings in recent years. While Internet service providers deploy fiber and recent wireless technologies ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2021)
Although the group delay of classical pulses through a barrier may suggest superluminality, the information transfer is limited by the precursor, which propagates at the vacuum light speed. Single photons, however, have ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
Human personality plays a crucial role in decision-making and it has paramount importance when individuals negotiate with each other to reach a common group decision. Such situations are conceivable, for instance, when a ...
(Chapter / Bokkapittel / AcceptedVersion; Peer reviewed, 2020)
The proliferation of IoT (Internet of Things) though making life easier, comes with security and privacy challenges. We have previously proposed a security classification methodology meant to help in practice build IoT ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
Concepts such as Industry 4.0 and Cyber-Physical Systems may bring forward a new industrial revolution. These concepts require extensive connectivity far beyond what is provided by traditional industrial networks. The ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
We present a holmium-doped all-fiber master oscillator power amplifier (MOPA) system operating at 2108 nm targeting optical frequency conversion applications. The MOPA delivers pulses of 0.52 mJ energy at 10 kHz repetition ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
Troubleshooting in SDN-based networks is still a cumbersome task that can overwhelm human attention. Various anomalies, such as installation failure, disordered rules, and loops, remain unnoticed even when the most recent ...
(Chapter / Bokkapittel / AcceptedVersion; Peer reviewed, 2022)
This paper shows the feasibility of combining robust motion primitives generated through the Sums Of Squares programming theory with a discrete Rapidly exploring Random Tree algorithm. The generated robust motion primitives, ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
Abstract A class of strictly localized states which can be made arbitrarily close to single photons is constructed, and expressions for central properties are provided. It is demonstrated that single photon states can be ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
Empirical studies examining the interplay between informal and formal institutions on economic growth are scarce. As a result, we do not know how differences in trust affect the economic returns of the quality of regional ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
Fish telemetry is a potential method to monitor the well-being of farmed fish, where a reference group of fish are equipped with sensors tags that oversee their health and wirelessly transmit the data. Many fish must be ...
(Master thesis / Masteroppgave, 2022)
In order to further the sustainability of renewable energy generation, the way land use is allocated must be considered. In the case of solar energy, land that is best used for photovoltaic power plants is often also best ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
Traversal in off-road conditions for Unmanned Ground Vehicles is highly relevant for defence applications, with an increasing amount of research being put into the field. A central part of the autonomous traversal is path ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
This paper presents the design, control, and experimental evaluation of a novel fully automated robotic-assisted system for the positioning and insertion of a commercial full core biopsy instrument under guidance by ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
Multispectral imaging is an attractive sensing modality for small unmanned aerial vehicles (UAVs) in numerous military and civilian applications such as reconnaissance, target detection, and precision agriculture. Cameras ...
(Doctoral thesis / Doktoravhandling, 2022)
In order to address the environmental challenges we face, transitioning towards sustainable, low emission energy systems is of paramount importance. Solar photovoltaics (PV) is a technology that plays an important role in ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
Abstract
The development of efficient storage systems is one of the keys to the success of the energy transition. There are many ways to store energy, but among them, electrochemical storage is particularly ...
(Master thesis / Masteroppgave, 2022)
Platooning is when one or more follower vehicles follow a lead vehicle autonomously based on information gained through sensors or communication. Due to being autonomous, the vehicles in the platoon can react faster and ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
Abstract
Industrial and public interest in hydrogen technologies has risen strongly recently, as hydrogen is the ideal means for medium to long term energy storage, transport and usage in combination with renewable ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
In group decision-making (GDM), fuzzy preference relations (FPRs) refer to pairwise preferences in the form of a matrix. Within the field of GDM, the problem of estimating missing values is of utmost importance, since many ...
(Master thesis / Masteroppgave, 2022)
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
Energy systems optimisation models are used for analysing energy systems and questions of e.g. greenhouse gas mitigation aligned with the Paris Agreement. However, the techno-economic nature of energy system models has ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
Abstract
With the increased penetration of wind energy into the power grid, it has become increasingly important to be able to predict the expected power production for larger wind farms. Deep learning (DL) models ...
(Master thesis / Masteroppgave, 2022)
(Master thesis / Masteroppgave, 2022)
Formålet med dette prosjektet er å undersøke potensialet for elektrisitetsproduksjon med bifacial solcelle (PV) systemer på nordlige breddegrader. Prosjektet undersøker hvordan ytelsen til et bifacial PV-system avhenger ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
The high spatial and temporal resolution electricity system model, highRES, is used to design cost-effective, flexible and weather resilient electricity systems for Great Britain and Europe. The model is specifically ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
The rapid depletion of fossil-based energy supplies, along with the growing reliance on renewable resources, has placed supreme importance on the predictability of renewables. Research focusing on wind park power modelling ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
The Mjølnir impact crater in the Norwegian Barents Sea features among the 20 largest impact craters listed in the Earth Impact Database. The impact is dated to 142 ± 2.6 Ma, corresponding closely to the Jurassic/Cretaceous ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
This article assesses how the ground-penetrating radar RIMFAX will image the crater floor at the Mars 2020 landing site, where lithological compositions and stratigraphic relationships are under discussion prior to mission ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
The signal-to-noise ratio of modern cameras under normal operating conditions tends to be limited by “photon noise” originating from the random arrival of photons. For best signal-to-noise ratio, it is desirable to collect ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
A study investigating Transformer and LSTM models applied to raw audio for automatic generation of counterpoint was conducted. In particular, the models learned to generate missing voices from an input melody, using a ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
The growing number of data centers consumes a vast amount of energy for processing. There is a desire to reduce the environmental footprint of the IT industry, and one way to achieve this is to use renewable energy sources. ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
Background
Intimate partner violence (IPV) during pregnancy is a global health problem with adverse consequences for mothers, infants and families. We hypothesise that information about IPV and safety ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
We propose and investigate a bidirectional device-to-device (D2D) transmission scheme that exploits cooperative downlink non-orthogonal multiple access (NOMA) (termed as BCD-NOMA). In BCD-NOMA, two source nodes communicate ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
To improve the security and reliability of wind energy production, short-term forecasting has become of utmost importance. This study focuses on multi-step spatio-temporal wind speed forecasting for the Norwegian continental ...
Expert Q-learning: Deep Reinforcement Learning with Coarse State Values from Offline Expert Examples
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
In this article, we propose a novel algorithm for deep reinforcement learning named Expert Q-learning. Expert Q-learning is inspired by Dueling Q-learning and aims to incorporate semi-supervised learning into reinforcement ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2022)
Q-learning is one of the most well-known Reinforcement Learning algorithms. There have been tremendous efforts to develop this algorithm using neural networks. Bootstrapped Deep Q-Learning Network is amongst them. It ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
Thermography from unmanned aerial vehicles (UAV) is widely used for module condition surveys and defect detection in solar (photovoltaic) power plants. This article presents an optimized defect inspection procedure in which ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
Methods for quick and accurate detection and diagnosis of defects in PV systems are increasingly important as the global photovoltaic (PV) capacity continues to grow at a rapid pace. Two of the most used methods for defect ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
In this paper, we report the microstructure and first hydrogenation properties of TiFe cast with 4 wt.% of Zr. Measurements were made in as-cast state and after processing by ball milling and cryomilling. It was found that ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
Abstract
The Radar Imager for Mars’ Subsurface Experiment (RIMFAX) is a Ground Penetrating Radar on the Mars 2020 mission’s Perseverance rover, which is planned to land near a deltaic landform in Jezero crater. RIMFAX ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
We propose a method for jointly estimating intrinsic calibration and internal clock synchronisation for a pantilt- zoom (PTZ) camera using only data that can be acquired in the field during normal operation. Results show ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2018)
A complete chemical and morphological analysis of the evolution of battery electrode materials can be achieved combining different and complementary techniques. Operando small-angle X-ray scattering (SAXS) and wide-angle ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
The coldest and densest structures of gas and dust in the Universe have unique spectral signatures across the (sub-)millimetre bands (υ ≈30 - 950 GHz). The current generation of single dish facilities has given a glimpse ...
(Conference object / Konferansebidrag / PublishedVersion, 2018)
The aim of this work is to develop and test new methods for quality control of data from commercial monitoring systems for small and medium sized PV installations. Such installations often have limited or non-existent ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2019)
This paper proposes a linear parameter varying (LPV) interval unknown input observer for the robust fault diagnosis of actuator faults and ice accretion in unmanned aerial vehicles (UAVs) described by an uncertain model. ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
Background: The increasing prevalence of gestational diabetes mellitus (GDM) among women of different ethnic backgrounds provides new challenges for health care professionals, who often find it difficult to provide information ...
(Chapter / Bokkapittel / SubmittedVersion, 2019)
The growing number of Wi-Fi networks at homes, buildings and public areas can consume excessive energy and therefore increase CO2 emissions. Hence, the aim of this paper is to investigate the energy consumption of Wi-Fi ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2019)
Artificial intelligence (AI) receives attention in media as well as in academe and business. In media coverage and reporting, AI is predominantly described in contrasted terms, either as the ultimate solution to all human ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
Policy anomalies are frequent in nowadays’s computer networks due to their increasing configuration complexity. Resolving policy anomalies usually requires network administrator intervention, which is a time-intensive and ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
Program evolution may reveal bad design decisions, misunderstandings, erroneous code, or erroneous specifications, because problems made early in the design of a system may not be discovered until much later in the life-time ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
Multi-function swarms are swarms that solve multiple tasks at once. For example, a quadcopter swarm could be tasked with exploring an area of interest while simultaneously functioning as ad-hoc relays. With this type of ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
There is a profound duality between rays and waves. In fact, 70 years ago, in the context of quantum mechanics, Feynman showed that rays, properly equipped with phases and correctly summed, provide exact solutions of the ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
The Digital Divide is one of the key challenges for mankind. Despite attempts to digitally include people, the divide is bigger than ever. This contribution [1] to a sustainable future promotes “Internet lite” as the new ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
The radiometric performance of cameras is customarily characterized and specified in terms of component properties such as F-number and readout noise. This paper considers the camera as an integrated unit and derives ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
With the proliferation of technologies such as wireless sensor networks (WSNs) and the Internet of things (IoT), we are moving towards the era of automation without any human intervention. Sensors are the principal components ...
(Chapter / Bokkapittel / AcceptedVersion; Peer reviewed, 2020)
Non-orthogonal multiple access (NOMA) is consid-ered an important candidate for the next-generation cellular networks to address the issue of exponentially growing data traffic from technologies like the Internet of Things ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
Securing and managing large, complex enterprise network infrastructure requires capturing and analyzing network traffic traces in real-time. An accurate passive Operating System (OS) fingerprinting plays a critical role ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
In this paper, we propose a novel parameter initial value estimation method of Lithium-ion battery for state of charge (SOC) estimation by using Local Regression Modeling (LRM) and Vector Fitting (VF). To estimate SOC ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
The photogenerated current of solar cells can be enhanced by light management with surface structures. For solar cells with optically thin absorbing layers, it is especially important to take advantage of this fact through ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2021)
Semiconductor nanocrystals are often proposed as a viable route to improve solar energy conversion in photovoltaics and photoelectrochemical systems. Embedding the nanocrystals in, e.g. a transparent and conducting electrode ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2019)
This study investigates how thermal signatures observed in PV systems using infrared thermography (IRT) affect the performance of PV modules and strings. To assess this, we use IRT images as a basis for circuit modeling ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
Recent long term planning studies have demonstrated the important role of variable renewables (VRE) in decarbonising our energy system. However, cost-optimising models do not capture the visual impact of VREs on the landscape ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2004)
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2019)
Magnetic permeabilities derived for infinite, periodic media are used in the Fresnel equation to calculate the reflection from corresponding semi-infinite media. By comparison to finite-difference time-domain (FDTD) ...