PhD theses in Engineering and Sciences: Recent submissions
Now showing items 41-60 of 112
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Undergraduate students’ performance in mathematics : Individual and combined effects of approaches to learning, self-efficacy, and prior mathematics knowledge
(Doctoral Dissertations at the University of Agder; no. 312, Doctoral thesis, 2021)This dissertation concerns an exploration of factors that affect the learning outcomes of students in higher education mathematics. It is framed within a quantitative research paradigm in which the existence of personal ... -
Techno-Economic Performance Evaluation of Photovoltaic based Micro-Grid with Energy Management Strategies
(Doctoral Dissertations at the University of Agder; no. 313, Doctoral thesis, 2021)The operational performance of grid connected micro-grid system can be affected by many factors e.g. techno-economic sizing, appropriate energy management strategy, geographical locations, grid constrains and electricity ... -
Opportunities and Challenges when Students Work with Vocationally Connected Mathematics Tasks
(Doctoral Dissertations at the University of Agder; no. 309, Doctoral thesis, 2021)Students in vocational education in Norway take a compulsory mathematics course in the first year of their programme. This course offers opportunities for engaging with mathematics which can be highly relevant to practice ... -
The resource decisions and documents of undergraduate engineering students in mathematics courses
(Doctoral Dissertations at the University of Agder; no. 307, Doctoral thesis, 2020)This thesis concerns a multiple case study, carried out at three Norwegian universities. The goal was to find similarities and differences between how engineering students from different university contexts used resources ... -
Advances in Deep Learning Towards Fire Emergency Application : Novel Architectures, Techniques and Applications of Neural Networks
(Doctoral Dissertations at the University of Agder; no. 308, Doctoral thesis, 2020)Deep Learning has been successfully used in various applications, and recently, there has been an increasing interest in applying deep learning in emergency management. However, there are still many significant challenges ... -
Motion Control of Hydraulic Winch Using Variable Displacement Motors
(Doctoral Dissertations at the University of Agder; no. 305, Doctoral thesis, 2020)To compete in the open market of the offshore crane industry, it is imperative for the manufacturer to continuously improve crane operability. In this context, the crane operability is expressed by means of a so-called ... -
Temperature coefficients and crystal defects in multicrystalline silicon solar cells
(Doctoral Dissertations at the University of Agder; no. 300, Doctoral thesis, 2020)The conversion efficiency of a photovoltaic device is strongly dependent on the operating temperature. For most devices, the efficiency, and hence the power production, decreases with increasing temperature due to fundamental, ... -
Machine Learning Tools for Radio Map Estimation in Fading-Impaired Channels
(Doctoral Dissertations at the University of Agder; no. 297, Doctoral thesis, 2020)In spectrum cartography, also known as radio map estimation, one constructs maps that provide the value of a given channel metric such as as the received power, power spectral density (PSD), electromagnetic absorption, or ... -
Teaching and learning for mathematical literacy
(Doctoral Dissertations at the University of Agder; no. 299, Doctoral thesis, 2020)This dissertation reports from research that investigates the nature of teaching and learning for mathematical literacy in three lower secondary schools in Norway. Mathematical literacy is a notion used to denote the ... -
Dynamics of undergraduate engineering students’ learning activities in mathematics in an online and in a blended environment
(Doctoral Dissertations at the University of Agder; no. 291, Doctoral thesis, 2020)This thesis reports from a research study which investigates the role of technology rich environments in undergraduate engineering students’ processes of learning mathematics. The research is founded within a naturalistic ... -
Online Machine Learning for Graph Topology Identification from Multiple Time Series
(Doctoral Dissertations at the University of Agder; no. 298, Doctoral thesis, 2020)High dimensional time series data are observed in many complex systems. In networked data, some of the time series are influenced by other time series. Identifying these relations encoded in a graph structure or topology ... -
Supporting Effective Online Learning Groups for eLearning Systems
(Doctoral Dissertations at the University of Agder; no. 286, Doctoral thesis, 2020)Learning in groups has been advocated to increase learning based on the social constructivist learning theory. ICT has been preferred to bridge the gap between distance learning students for possibilities to enhance the ... -
Non-convex Optimization for Resource Allocation in Wireless Device-to-Device Communications
(Doctoral Dissertations at the University of Agder; no. 293, Doctoral thesis, 2020)Device-to-device (D2D) communication is considered one of the key frameworks to provide suitable solutions for the exponentially increasing data tra c in mobile telecommunications. In this PhD Thesis, we focus on the ... -
Production and application of sustainable metallurgical biochar pellets
(Doctoral Dissertations at the University of Agder; no. 284, Doctoral thesis, 2020)The effective decarbonization of our society must be boosted through the promotion of efficient alternatives to fossil fuels. This transition should take place gradually, involving a broad range of actors and technologies. ... -
Improving Energy Efficiency and Motion Control in Load-Carrying Applications using Self-Contained Cylinders
(Doctoral Dissertations at the University of Agder; no. 283, Doctoral thesis, 2020)Because of an increasing focus on environmental impact, including CO2 emissions and fluid spill pollution, inefficient hydraulic systems are being replaced by more environmentally friendly alternatives in several industries. ... -
Synthetic Esters in Hydraulic Valves
(Doctoral Dissertation at the University of Agder; no. 277, Doctoral thesis, 2020)Each year 35-37 million tons of lubrication is consumed. Hydraulic oils constitute 10.2% of the total lubrication consumption, and a large part of that is lost to leakage, hose burst and accidents. One way of reducing the ... -
Mathematical Modelling and Analysis of Vehicle Frontal Crash using Lumped Parameters Models
(Doctoral Dissertation at the University of Agder; no. 261, Doctoral thesis, 2020)A full-scale crash test is conventionally used for vehicle crashworthiness analysis. However, this approach is expensive and time-consuming. Vehicle crash reconstructions using different numerical modelling approaches can ... -
Student meaning making in elementary algebra teaching : An in-depth study of classrooms in four countries
(Doctoral dissertations at the University of Agder; no. 258, Doctoral thesis, 2020)The research presented in this thesis is based on observations and analyses of classroom data from four countries. The data were collected through a collaboration of local research teams in Finland, Norway, Sweden and the ... -
Towards Thompson Sampling for Complex Bayesian Reasoning
(Doctoral Dissertation at the University of Agder; no. 275, Doctoral thesis, 2020)Thompson Sampling (TS) is a state-of-art algorithm for bandit problems set in a Bayesian framework. Both the theoretical foundation and the empirical efficiency of TS is wellexplored for plain bandit problems. However, the ... -
Hybrid modeling and control of mechatronic systems using a piecewise affine dynamics approach
(Doctoral Dissertation at the University of Agder; no. 273, Doctoral thesis, 2020)This thesis investigates the topic of modeling and control of PWA systems based on two experimental cases of an electrical and hydraulic nature with varying complexity that were also built, instrumented and evaluated. A ...