Institutt for informatikk: Nye registreringer
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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 ... -
A multi-centre polyp detection and segmentation dataset for generalisability assessment
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-02-06)Polyps in the colon are widely known cancer precursors identifed by colonoscopy. Whilst most polyps are benign, the polyp’s number, size and surface structure are linked to the risk of colon cancer. Several methods have been developed to automate polyp detection and segmentation. However, the main issue is that they are not tested rigorously on a large multicentre purpose-built dataset, one reason ... -
pyndl: Naïve discriminative learning in python
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-11-15)The pyndl package implements Naïve Discriminative Learning (NDL) in Python. NDL is an incremental learning algorithm grounded in the principles of discrimination learning (Rescorla & Wagner, 1972; Widrow & Hoff, 1960) and motivated by animal and human learning research (e.g. Baayen et al., 2011; Rescorla, 1988). Lately, NDL has become a popular tool in language research to examine large corpora and ... -
Weakly supervised semantic segmentation for MRI: exploring the advantages and disadvantages of class activation maps for biological image segmentation with soft boundaries
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-02-13)Fully supervised semantic segmentation models require pixel-level annotations that are costly to obtain. As a remedy, weakly supervised semantic segmentation has been proposed, where image-level labels and class activation maps (CAM) can detect discriminative regions for specific class objects. In this paper, we evaluated several CAM methods applied to different convolutional neural networks (CNN) ... -
Designing and presenting digital nudges on mobile phones Building an app based on system requirements and usability heuristics
(Mastergradsoppgave; Master thesis, 2022-12-15)The environment is progressively affected by global warming and pollution, whereas fossil fuel transportation is one of the major causes. This thesis describes a system that aims to support users in choosing environmentally friendly transportation alternatives. The system uses digital nudging to motivate behavioral change in a non-intrusive manner. This project focuses on the presentation of ... -
Record linkage of Norwegian historical census data using machine learning
(Mastergradsoppgave; Master thesis, 2022-08-02)The Historical Population Register (HPR) is a project to build the longitudinal life history of individuals by integrating the historical records of the people in Norway since the 19th century. This study attempted to improve the linking rate between the 1875-1900 censuses in HPR, which is currently low, using machine learning approaches. To this end, I developed a machine learning model for linking ... -
Client Selection in Federated Learning under Imperfections in Environment
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-02-25)Federated learning promises an elegant solution for learning global models across distributed and privacy-protected datasets. However, challenges related to skewed data distribution, limited computational and communication resources, data poisoning, and free riding clients affect the performance of federated learning. Selection of the best clients for each round of learning is critical in alleviating ... -
The Impossible, the Unlikely, and the Probable Nudges: A Classification for the Design of Your Next Nudge
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-10-22)Nudging provides a way to gently influence people to change behavior towards a desired goal, e.g., by moving towards a healthier or more environmentally friendly lifestyle. Personalized and context-aware digital nudging (named smart nudging) can be a powerful tool for efficient nudging by tailoring nudges to the current situation of each individual user. However, designing smart nudges is challenging, ... -
A Framework for AI-enabled Proactive mHealth with Automated Decision-making for a User’s Context
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022)Health promotion is to enable people to take control over their health. Digital health with mHealth empowers users to establish proactive health, ubiquitously. The users shall have increased control over their health to improve their life by being proactive. To develop proactive health with the principles of prediction, prevention, and ubiquitous health, artificial intelligence with mHealth can ... -
Influence of Biosynthesized Nanoparticles Addition and Fibre Content on the Mechanical and Moisture Absorption Behaviour of Natural Fibre Composite
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-12-19)This study looks at how incorporating nanofiller into sisal/flax-fibre-reinforced epoxy-based hybrid composites affects their mechanical and water absorption properties. The green Al2O3 NPs are generated from neem leaves in a proportion of leaf extract to an acceptable aluminium nitrate combination. Both natural fibres were treated with different proportions of NaOH to eliminate moisture absorption. ... -
Nudging according to user’s preferences
(Mastergradsoppgave; Master thesis, 2022-11-15)Physical inactivity has been identified as a global pandemic, physical inactivity causes multiple health outcomes in different demographic group such as coronary heart disease, type 2 diabetes, colon, and breast cancer. A physical inactive person takes less than 5000 steps a day. To try to reduce physical inactivity along individual for healthy lifestyle, this thesis provides personalized digital ... -
Virtual labeling of mitochondria in living cells using correlative imaging and physics-guided deep learning
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-09-28)Mitochondria play a crucial role in cellular metabolism. This paper presents a novel method to visualize mitochondria in living cells without the use of fluorescent markers. We propose a physics-guided deep learning approach for obtaining virtually labeled micrographs of mitochondria from bright-field images. We integrate a microscope’s point spread function in the learning of an adversarial neural ... -
Exploration of Different Time Series Models for Soccer Athlete Performance Prediction
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-06-29)Professional sports achievements combine not only the individual physical abilities of athletes but also many modern technologies in areas such as medicine, equipment production, nutrition, and physical and mental health monitoring. In this work, we address the problem of predicting soccer players’ ability to perform, from subjective self-reported wellness parameters collected using a commercially ... -
Intersecting near-optimal spaces: European power systems with more resilience to weather variability
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-01-03)We suggest a new methodology for designing robust energy systems. For this, we investigate so-called near-optimal solutions to energy system optimisation models; solutions whose objective values deviate only marginally from the optimum. Using a refined method for obtaining explicit geometric descriptions of these near-optimal feasible spaces, we find designs that are as robust as possible to ... -
Effectiveness of LRB in Curved Bridge Isolation: A Numerical Study
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-11-07)Lead Rubber Bearings (LRBs) represent one of the most widely employed devices for the seismic protection of structures. However, the effectiveness of the same in the case of curved bridges has not been judged well because of the complexity involved in curved bridges, especially in controlling torsional moments. This study investigates the performance of an LRB-isolated horizontally curved ... -
Towards the Neuroevolution of Low-level artificial general intelligence
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-10-14)In this work, we argue that the search for Artificial General Intelligence should start from a much lower level than human-level intelligence. The circumstances of intelligent behavior in nature resulted from an organism interacting with its surrounding environment, which could change over time and exert pressure on the organism to allow for learning of new behaviors or environment models. Our ... -
TFHE-rs: A library for safe and secure remote computing using fully homomorphic encryption and trusted execution environments
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-01-20)Fully Homomorphic Encryption (FHE) and Trusted Execution Environ-ments (TEEs) are complementing approaches that can both secure computa-tions running remotely on a public cloud. Existing FHE schemes are, however, malleable by design and lack integrity protection, making them susceptible to integrity breaches where an adversary could modify the data and corrupt the output. This paper describes how ...