Lazar, Iustin (1998) A multi-level nearest-neighbour algorithm for predicting protein secondary structure. Masters thesis, Concordia University.
A thesis on machine learning and prediction of protein secondary structure. We develop a variation of the nearest-neighbour algorithm that adopts a multi-level strategy together with a variable window size. The algorithm is applied to the problem of predicting the secondary structure of a protein given its primary structure: that is, given a sequence of amino-acids, output a sequence of secondary structures (helix, sheet, or coil). A new training set is developed that is orthogonal, and covers the known classes of proteins. Overall accuracy is 65.0%, with 68.7% accuracy for helices, 66.3% accuracy for sheets, and 61.4% for coils. This compares well with existing methods, in that the best results for a single nearest-neighbour classifier is 65.1% by Salzberg and Cost in 1992. Our accuracy rate for sheets is better than known methods, but our accuracy rate for coils is much lower than existing methods.
|Divisions:||Concordia University > Faculty of Engineering and Computer Science > Computer Science and Software Engineering|
|Item Type:||Thesis (Masters)|
|Pagination:||viii, 120 leaves : ill. ; 29 cm.|
|Degree Name:||Theses (M.Comp.Sc.)|
|Program:||Computer Science and Software Engineering|
|Thesis Supervisor(s):||Butler, Gregory|
|Deposited By:||Concordia University Libraries|
|Deposited On:||27 Aug 2009 13:12|
|Last Modified:||08 Dec 2010 10:15|
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