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Johannes Tjønnås

Research Scientist

Johannes Tjønnås

Research Scientist

Johannes Tjønnås
Phone: +47 408 25 940
Mobile: +47 408 25 940
Department: Mathematics and Cybernetics
Office: Trondheim

Publications and responsibilities

Publications

Publication

A multi-sensor system for automatic analysis of classical cross-country skiing techniques

https://www.sintef.no/en/publications/publication/?pubid=CRIStin+1509438

Commercial systems utilizing data from inertial measurement units (IMUs) to analyse movement patterns have not yet been adapted to monitor daily training in cross-country (XC) skiing. The main purposes of this study are to investigate: (1) the feasibility and potential of a multi-sensor system consi...

Authors Seeberg Trine Margrethe Tjønnås Johannes Rindal Ole Marius Hoel Haugnes Pål Dalgard Steffen Harald Sandbakk Øyvind
Year 2017
Type Journal publication
Publication

Control of Reversible Degradation Mechanisms in Fuel Cells: Mitigation of CO contamination

https://www.sintef.no/en/publications/publication/?pubid=CRIStin+1420615

Fuel Cells are subject to several degradation phenomena where some are reversible and some irreversible. Normally all contribute to a reduced cell voltage, but it may be complicated to discriminate the particular causes. A brief overview is given and a method for modelling and controlling the partic...

Authors Tjønnås Johannes Zenith Federico Halvorsen Ivar Johan Klages Merle Scholta Joachim
Year 2016
Type Journal publication
Publication

Towards more autonomous ROV operations: Scalable and modular localization with experiment data.

https://www.sintef.no/en/publications/publication/?pubid=CRIStin+1396961

Remotely Operated Vehicles (ROVs) are pivotal for subsea inspection, maintenance and repair (IMR) operations. Increased autonomy in such IMR operations may constitute significant improvements in HSE (Health- Safety, Environment) and cost-effectiveness of operations. Localization is an enabling techn...

Authors Grøtli Esten Ingar Tjønnås Johannes Azpiazu Lozano Jon Transeth Aksel Andreas Ludvigsen Martin
Year 2016
Type Journal publication
Publication

Dual Control of low concentration CO poisoning by Anode Air Bleeding of Low Temperature Polymer Electrolyte Membrane Fuel Cells

https://www.sintef.no/en/publications/publication/?pubid=CRIStin+1392386

Fuel impurities, fed to a polymer electrolyte membrane fuel cell, can affect stack performance by poisoning of catalyst layers. This paper describes the dynamic behaviour of a stack, including state-of-the-art membrane electrode assemblies (MEA) of three different manufacturers, at different operati...

Authors Klages Merle Tjønnås Johannes Zenith Federico Halvorsen Ivar Johan Scholta Joachim
Year 2016
Type Journal publication
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