Changkyu Choi

Master of science Changkyu Choi will Friday June 9, 2023, at 12:15 hold his disputas for the PhD degree in Science. The title of his thesis is: 

"Advancing Deep Learning for Marine Environment Monitoring"


Marine environment monitoring has become increasingly significant due to the excessive exploitation of oceans, which detrimentally impacts ecosystems. Deep learning provides an effective monitoring approach by automating the analysis of vast amounts of observed image data, enabling stakeholders to make informed decisions regarding fishing quotas or conservation efforts. The success of deep learning is often attributed to its capacity to extract relevant features from data, without the need for handcrafted rules or heuristics. However, this capability is not without limitations, as the intricate feature extraction process of deep learning-based systems poses fundamental challenges. A lack of annotated data presents an inherent challenge for deep learning. The widespread success of deep learning has primarily relied on the ample availability of annotated data, while deep learning models encounter difficulties when learning from limited annotations. However, obtaining annotated data is expensive, particularly in the context of marine environment monitoring, as it is often a manual process demanding the expertise of domain specialists. Another challenge of deep learning is a lack of explainability. The black-box nature of deep learning models can make it difficult to understand how they arrive at their decisions. This hinders their adoption in critical decision-making processes, as stakeholders may be hesitant to trust models whose decision-making rationale is not transparent or interpretable. To address the challenges and further advance deep learning methodologies, this thesis proposes three novel deep learning methods, highlighting marine environment monitoring as an application domain.

Evaluation Committee

  • Prof. Morten Goodwin, Department of Information and communication technology, University of Agder (1. Opponent)
  • Associate Prof. Vedrana Dahl, Department of Applied Mathematics and Computer Science, Technical University of Denmark (2. Opponent)
  • Associate Prof. Benjamin Ricaud, IFT, UiT (intern member and leader of the committee)


  • Professor Robert Jenssen, IFT, UiT (main supervisor)
  • Researcher Michael C. Kampffmeyer, IFT, UiT (co-supervisor)
  • Senior Researcher Arnt-Børre Salberg, Norsk Regnesentral (co-supervisor)

The Disputas will be led by Professor Olav Gaute Hellesø, head of Department of Physics and Technology.

Streaming site

The disputas and trial lecture will be streamed from these sites:

Disputas (12:15 - 16:00)

Trial Lecture (10:15 - 11:15)


The thesis is available through Munin.

When: 09.06.23 at 12.15–16.00
Where: Auditorium 1.022, Teknologibygget
Location / Campus: Digital, Tromsø
Target group: Employees, Students, Guests, Invited, Unit
Contact: Helge Ravn
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