Blar i NTNU Open på forfatter "Sørensen, Asgeir Johan"

Viser treff 121-131 av 131

    • Underwater Hyperspectral Imaging as a Tool for Benthic Habitat Mapping 

      Mogstad, Aksel Alstad (Doctoral theses at NTNU;2021:271, Doctoral thesis, 2021)
      Since the 1950s, continuous technological advances have gradually improved our ability to map the seafloor and its associated benthic habitats. Historically, seafloor mapping has largely been carried out acoustically, using ...

    • Underwater hyperspectral imaging: a new tool for marine archaeology 

      Ødegård, Øyvind; Mogstad, Aksel Alstad; Johnsen, Geir; Sørensen, Asgeir Johan; Ludvigsen, Martin (Journal article; Peer reviewed, 2018)
      By applying an underwater hyperspectral imager (UHI) to a selection of archaeological artifacts, we have found spectral signatures that are representative of materials likely to be present at wreck sites. By successfully ...

    • Underwater Machine Vision for Long Term Operation of Robotic Platforms 

      Khan, Md Ashiqul Alam (Master thesis, 2023)
      Denne masteroppgaven fokuserer på å forbedre geolokalisering under vann ved å identifisere den mest effektive metoden for forbehandling av data og registrering av punktskyer. Vi undersøker et flerårig 3D-punktsky-datasett ...

    • Unmanned Aerial Vehicle as Communication Relay for Autonomous Underwater Vehicle - Field Tests 

      Johansen, Tor Arne; Zolich, Artur Piotr; Hansen, Torkel; Sørensen, Asgeir Johan (IEEE Globecom Workshop;Wireless Networking and Control for Unmanned Autonomous Vehicles, Journal article, 2014)
      This paper describes field experiments with an X8 Unmanned Aerial Vehicle (UAV) operating as a wireless communication relay while loitering over a REMUS 100 Autonomous Underwater Vehicle (AUV) being at the ocean surface. ...

    • Use of an Autonomous Surface Vehicle reveals small-scale diel vertical migrations of zooplankton and susceptibility to light pollution under low solar irradiance 

      Ludvigsen, Martin; Berge, Jørgen; Geoffroy, Maxime; Cohen, Jonathan H.; De La Torre, Pedro R.; Nornes, Stein Melvær; Singh, Hanumant; Sørensen, Asgeir Johan; Daase, Malin; Johnsen, Geir (Journal article; Peer reviewed, 2018)
      Light is a major cue for nearly all life on Earth. However, most of our knowledge concerning the importance of light is based on organisms’ response to light during daytime, including the dusk and dawn phase. When it is ...

    • Validation of hyperspectral camera operations with an experimental aircraft 

      Langer, Dennis D.; Prentice, Elizabeth; Johansen, Tor Arne; Sørensen, Asgeir Johan (Peer reviewed; Journal article, 2022)
      HYPSO-1 is a Small Satellite with a hyperspectral camera payload inside a six unit cubesat platform, launched january 2022. This paper describes how the operation of the same hyperspectral camera is validated by deployment ...

    • Wave disturbance rejection for monopile offshore wind turbines 

      Smilden, Emil; Bachynski, Erin Elizabeth; Sørensen, Asgeir Johan; Amdahl, Jørgen (Journal article; Peer reviewed, 2019)
      The dimensions of offshore wind turbine (OWT) support structures are governed by fatigue considerations. For 6‐ to 10‐MW OWTs, wave loads are often dominating in terms of fatigue utilization. The present work proposes a ...

    • Weather optimal dynamic positioning of underactuated AUVs using output feedback control 

      Refsnes, Jon E Gorset; Sørensen, Asgeir Johan; Pettersen, Kristin Ytterstad (Journal article, 2006)
      In this paper we present an output feedback control system for dynamic positioning of underactuated AUVs. The control objective is to maintain a desired distance to the target while orienting the vehicle towards the target ...

    • Weather Routing of Supply Vessels in the North Sea - Solving the Supply Vessel Weather Routing Problem 

      Kjølleberg, Joakim (Master thesis, 2015)
      This thesis is concerned with defining and solving the supply vessel weather routing problem. The particular problem in focus will be Statoil's supply circuit in the middle North Sea, including the Johan Sverdrup oil field. ...

    • Wind Powered Marine Vehicle - A Concept Study 

      Vestum, Emil (Master thesis, 2015)
      In conventional sailboat design, the heeling momentum introduced by the rigid connection of foils in air and water is a limitation on the maximum ve- locity. By removing the hull all together, wetted surface induced drag ...

    • Zero-Emission Autonomous Ferries for Urban Water Transport: Cheaper, Cleaner Alternative to Bridges and Manned Vessels 

      Reddy, Namireddy Praveen; Zadeh, Mehdi Karbalaye; Thieme, Christoph Alexander; Skjetne, Roger; Sørensen, Asgeir Johan; Aanondsen, Svein Aanond; Breivik, Morten; Eide, Egil (Journal article, 2019)
      Because water is an integral part of day-to-day life for humans, civilizations have generally flourished either in coastal areas or near river basins. Today, about 40% of the world?s population lives near a coast and many ...