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Master Thesis Algorithms

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Algorithms – Who? Faculty Lars Arge Gerth Stølting Brodal Gudmund Skovbjerg Frandsen Kristoffer Arnsfelt Hansen Peter Bro Miltersen Christian Nørgaard Storm Pedersen Ph.d. and Master students … Researchers Thomas Mailund Henrik Blunck Peyman Afshani Nodari Sitchinava Deepak Ajwani Nguyen Kim Tang Elias Tsigaridas

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Algorithms – Where ? Algorithms (Turing 0+1) Arge, Brodal, Frandsen, Miltersen, Blunck, Ajwani, Sitchinava, Tsigaridas, Afshani, Hansen, Tang BioInformatics (Building 110) Pedersen, Mailund

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Introductory Programming 2 - Frandsen Algorithms and data structures 1+ 2- Brodal Machine architecture/Operating systems - Pedersen Advanced Optimization/Combinatorial search - Miltersen/Arnsfelt Computational geometry - Brodal Advanced data structures- Brodal I/O algorithms - Arge Dynamic algorithms - Frandsen Randomized algorithms - Frandsen String algorithms - Pedersen/Mailund Algorithms in bioinformatics - Pedersen Machine learning- Pedersen/Mailund Complexity theory - Miltersen/Hansen Algorithmic game playing- Miltersen Data compression (loseless/lossy)- Miltersen Algorithms – Courses

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I/O algorithms Computational geometry Data structures String algorithms Complexity theory Data compression Optimization Algebraic algorithms BioInformatics Graph algorithms Dynamic algorithms Randomized algorithms Algorithmic game theory Arge Brodal Frandsen Miltersen Pedersen Hansen Subset of research interests Solid lines = major interst Algorithms – Research

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Theoretical computer science Tool development –BioInformatics, I/O algorithms Algorithm engineering –primarily in relation to thesis work Seminars – master students very welcome –BiRC, MADALGO, CAGT, Computaional Mathematics…

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Algorithm Research – a typical result statement Cache-Oblivious Data Structures and Algorithms for Undirected Breadth-First Search and Shortest Paths, G. S. Brodal, R. Fagerberg, U. Meyer, N. Zeh. In Proc. 9th Scandinavian Workshop on Algorithm Theory, volume 3111 of Lecture Notes in Computer Science, pages 480-492. Springer Verlag, Berlin, 2004. Results

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Algorithm Research – another typical result On the Adaptiveness of Quicksort, G. S. Brodal, R. Fagerberg, G. Moruz. In Proc. 7th Workshop on Algorithm Engineering and Experiments, 2005. Comparisons by Quicksort Element swaps Running time

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Types of Algorithmic Thesis Solve a concrete problem …using algorithmic techniques Survey of a research area Implement a technical paper...fill in the missing details...perform experiments Explain all (missing) details in a technical paper...how 8 pages become +100 pages Experimental comparison of several algorithms The clever idea: Describe a new algorithm Examples: www.cs.au.dk/~gerth/cv/#Advising www.cs.au.dk/~cstorm/www/students/

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Master Thesis in Algorithms Thesis work Large fraction of time spend on trying to understand technical complicated constructions Implementations are often an ”existence proof” – most algorithm authors do not implement their algorithms (did they ever think about the missing details?) Hard to convince friends that it took you ½ year to understand an 8 page paper...

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Hidden work... ! Warning ! Need to understand another paper first ! Warning ! Nontrivial construction ahead of you

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