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Two-sided estimates of the Lebesgue constants with respect to Vilenkin systems and applications
(Journal article; Peer reviewed; Tidsskriftartikkel, 2017-03-13)
In this paper, we derive two-sided estimates of the Lebesgue constants for bounded Vilenkin systems, we also present some applications of importance, e.g., we obtain a characterization for the boundedness of a subsequence of partial sums with respect to Vilenkin–Fourier series of H 1 martingales in terms of n's variation. The conditions given in this paper are in a sense necessary and sufficient.
Scenario-based approaches for handling uncertainty in MPC for power system frequency control
(Journal article; Peer reviewed; Tidsskriftartikkel, 2017)
A stochastic nonlinear model predictive controller (SNMPC) is designed for automatic generator control of a proxy of the Nordic power system, and it is compared with a multi-stage nonlinear model predictive controller (MNMPC). Both controllers are scenario based, but originate in two different disturbance modeling paradigms; stochastic and deterministic. A simulation study indicates that the two ...
A case study to estimate thermal conductivity of ABS in Cold Climate Chamber
(Journal article; Peer reviewed; Tidsskriftartikkel, 2015-10-22)
Non steady state thermal conductivity of ABS was estimated using an analytical approach in a Cold Climate Chamber at ?10?C and ?14?C. Two hollow cylinders of ABS of varying thickness were used to estimate the conductivity. The material was porous but the porosity was unknown. This paper is a case study to understand, if it is reasonable to estimate the thermal conductivity using the analytical varying ...
Improving the Decision-making of Reverse Logistics Network Design Part I: A MILP Model under Stochastic Environment
(Peer reviewed; Bokkapittel; Book; Bok; Chapter, 2018-02-11)
The study of the network design problems related to reverse supply chain and reverse logistics is of great interest for both academicians and practitioners due to its important role for a sustainable society. However, reverse logistics network design is a complex decision-making problem that involves several interactive factors and faces many uncertainties. Thus, in order to improve the reverse ...
Lagrangian and ALE Formulations For Soil Structure Coupling with Explosive Detonation
(Journal article; Tidsskriftartikkel; Peer reviewed, 2017)
Simulation of Soil-Structure Interaction becomes more and more the focus
of computational engineering in civil and mechanical engineering, where
FEM (Finite element Methods) for soil and structural mechanics and Finite
Volume for CFD (Computational Fluid Dynamics) are dominant. New
advanced formulations have been developed for FSI (Fluid Structure
Interaction) applications using ALE (Arbitrary ...
Recognizing Bedside Events Using Thermal and Ultrasonic Readings
(Journal article; Tidsskriftartikkel; Peer reviewed, 2017-06-09)
Falls in homes of the elderly, in residential care facilities and in hospitals commonly
occur in close proximity to the bed. Most approaches for recognizing falls use cameras, which
challenge privacy, or sensor devices attached to the bed or the body to recognize bedside events and
bedside falls. We use data collected from a ceiling mounted 80 60 thermal array combined with
an ultrasonic sensor ...
To Measure Relative Permittivity of Atmospheric Ice Using Frequency Sweep
(Journal article; Tidsskriftartikkel; Peer reviewed, 2016-10-31)
The use of AD59333 IC for detecting atmospheric ice and atmospheric ice type was evaluated in this
article. A prototype circuit was developed and was tested using a frequency sweep from 40 Hz to 20 kHz. The IC
was calibrated using 100 kΩ resistor. The real and imaginary components of discrete Fourier transform were
recorded at each frequency increment in order calculate the gain factor at each ...
A field study of atmospheric icing analysis in a complex terrain of the high north
(Journal article; Tidsskriftartikkel; Peer reviewed, 2014-12)
Analyses of atmospheric icing events hold the key for computing the significant parameters
leading to icing load calculations. In the cold regions of the high north, atmospheric icing
loads on structures become important when it comes to design and safety of infrastructures.
Furthermore, icing load calculations over a certain period of time provide a vital input for
designers to improve the ...
Atmospheric ice accretion on non rotating vertical circular cyliner
(Journal article; Tidsskriftartikkel; Peer reviewed, 2015-10-22)
Study of atmospheric ice accretion on a non-rotating vertical circular cylindrical object was carried out at dry and wet ice conditions. Both numerical and experimental techniques were used during this study. 3D numerical study was carried out using computational fluid dynamics based approach, whereas experimental study was carried out at Cryospheric Environmental Simulator ‘CES’ in Shinjo, Japan. ...
Approaches to learning of linear algebra among engineering students
(Peer reviewed; Bok; Book; Bokkapittel; Chapter, 2017-02)
The present paper investigates engineering students` own descriptions of what they mean by learning of linear algebra and how they know that they have learned something. I seek to extract keywords from engineering students` descriptions of learning of this discipline by drawing on grounded theory techniques and classifying the answers in conceptual and procedural approaches. By this, both detailed ...