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PSO and Kalman Filter-Based Node Motion Prediction for Data Collection from Ocean Wireless Sensors Network with UAV
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-05-13)
In this paper, we consider a wireless sensor network of nodes at the sea surface drifting due to wind and sea currents. In our scenario an Unmanned Aerial Vehicle (UAV) will be used to gather data from the sensor nodes. The goal is to find a flyable path which is optimal in terms of sensor node energy consumption, total channel throughput between the UAV and sensor nodes, flight time for the UAV and ...
Maximum Available Power of Undersea Capacitive Coupling in a Wireless Power Transfer System
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-06-23)
This paper studies the maximum available power of a dissipative capacitive power transfer (CPT) system submerged in seawater. The CPT system's maximum power capability is driven using the network theory, precisely the conjugate-image approach. The equations of the maximum available load power and the system's corresponding efficiency are expressed as a function of the capacitive coupling parameters. ...
En tematisk analyse av hva ingeniørstudenter gjør når de lærer lineær algebra
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-09-15)
Denne artikkelen diskuterer hva ingeniørstudenter gjør når de lærer lineær algebra. Arbeidet inngår i et pågående forskningsprosjekt om læring, og grunnlagsdataene for artikkelen ble samlet inn ved at studentene besvarte et obligatorisk spørreskjema der spørsmålet om hva de gjør når de lærer lineær algebra, ble stilt som et åpent spørsmål. Dataene representerer derfor studentenes egne ord om hva de ...
First-year engineering students’ mathematics task performance and its relation to their motivational values and views about mathematics
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-11-26)
This study investigates Finnish, Norwegian, and Swedish first-year
engineering students’ task performance in mathematics and examines
how it relates to their motivational values and beliefs about the nature of
mathematics. In a set of seven mathematical tasks, female students
outperformed male students, for example, in the simplification of
symbolic expressions. Our findings also show that ...
PD+ based trajectory tracking of the underactuated quadrotor platform using dual quaternions
(Journal article; Tidsskriftartikkel; Peer reviewed, 2019-08-29)
We address the problem of state feedback trajectory tracking of the underactuated quadrotor platform in the dual quaternion framework through a PD+ tracking controller. The control law negates the need of generating a desired attitude trajectory as the translational error is mapped directly onto the rotational actuators through a virtual frame. More precisely, we show uniform practical asymptotic ...
Observations of sunlit N2+ aurora at high altitudes during the RENU2 flight
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-09-24)
We present measurements of sunlit aurora during
the launch of the Rocket Experiment for Neutral Upwelling
2 (RENU2) on the 13 December 2015, 07:34 UTC. The in
situ auroral conditions coincide with those of sunlit aurora
and were characterised by the 391.4 and 427.8 nm N<sub>2</sub>
<sup>+</sup> emissions. A correlation between several auroral wavelengths, as
measured by a meridian-scanning ...
Modified demagnetisation control strategy for low-voltage ride-through enhancement in DFIG-based wind systems
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-02-16)
The large-scale wind energy conversion systems (WECSs) based on doubly-fed induction generators (DFIGs) are
very popular in recent years due to the numerous technical and economic benefits. With the increasing penetration level of wind
energy, the latest grid codes require the DFIG-based WECSs to remain connected to the grid under grid fault scenarios and
deliver the required reactive power into ...
Swedish first-year engineering students’ views of mathematics, self-efficacy and motivation and their effect on task performance
(Journal article; Tidsskriftartikkel; Peer reviewed, 2019-08-29)
We examine a group (N = 88) of Swedish first-year engineering students, their motivation, self-efficacy, and beliefs about the nature
of mathematics, and how these relate to their task performance in
mathematics. In our data, engineering students who emphasized the
exact reasoning in their view of mathematics performed significantly
better in a set of mathematical tasks than those who emphasized ...
Dual quaternion control: a review of recent results within motion control
(Journal article; Tidsskriftartikkel; Peer reviewed, 2019-11-24)
This paper presents a review of recent results in the field of dual quaternion based motion control. In addition, we derive two control laws for trajectory tracking control of a fully actuated rigid-body based on the resemblance of dual quaternion kinematics and dynamics to the quaternion based rotational kinematics and dynamics. A velocity error sliding surface and an integrator backstepping ...
Themes within lecturers' views on the teaching of linear algebra
(Journal article; Tidsskriftartikkel; Peer reviewed, 2019-09-25)
This paper reports on themes that arose in an investigation of university lecturers’ views on the teaching of linear algebra. This focus on themes was the initial part of a study concentrating on four areas: What is important to teach in a first course in linear algebra? Are there teaching methods which are particularly suited for such a course? Are there tools that should/should not be used; and ...