MF - Makale Koleksiyonu | Bilgisayar Mühendisliği Bölümü / Department of Computer Engineering by Işık Author "Yıldız, Olcay Taner"
Now showing items 1-20 of 20
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Constructing a WordNet for Turkish using manual and automatic annotation
Ehsani, Razieh; Solak, Ercan; Yıldız, Olcay Taner (Assoc Computing Machinery, 2018-05)In this article, we summarize the methodology and the results of our 2-year-long efforts to construct a comprehensive WordNet for Turkish. In our approach, we mine a dictionary for synonym candidate pairs and manually mark ... -
Construction of a Turkish proposition bank
Ak, Koray; Toprak, Cansu; Esgel, Volkan; Yıldız, Olcay Taner (Tubitak Scientific & Technical Research Council Turkey, 2018)This paper describes our approach to developing the Turkish PropBank by adopting the semantic role-labeling guidelines of the original PropBank and using the translation of the English Penn-TreeBank as a resource. We discuss ... -
Cost-conscious comparison of supervised learning algorithms over multiple data sets
Ulaş, Aydın; Yıldız, Olcay Taner; Alpaydın, Ahmet İbrahim Ethem (Elsevier Sci Ltd, 2012-04)In the literature, there exist statistical tests to compare supervised learning algorithms on multiple data sets in terms of accuracy but they do not always generate an ordering. We propose Multi(2)Test, a generalization ... -
Cryptanalysis of Fridrich's chaotic image encryption
Solak, Ercan; Çokal, Cahit; Yıldız, Olcay Taner; Bıyıkoğlu, Türker (World Scientific Publishing, 2010-05)We cryptanalyze Fridrich's chaotic image encryption algorithm. We show that the algebraic weaknesses of the algorithm make it vulnerable against chosen-ciphertext attacks. We propose an attack that reveals the secret ... -
Design and analysis of classifier learning experiments in bioinformatics: survey and case studies
İrsoy, Ozan; Yıldız, Olcay Taner; Alpaydın, Ahmet İbrahim Ethem (IEEE Computer Soc, 2012-12)In many bioinformatics applications, it is important to assess and compare the performances of algorithms trained from data, to be able to draw conclusions unaffected by chance and are therefore significant. Both the design ... -
Eigenclassifiers for combining correlated classifiers
Ulaş, Aydın; Yıldız, Olcay Taner; Alpaydın, Ahmet İbrahim Ethem (Elsevier Science Inc, 2012-03-15)In practice, classifiers in an ensemble are not independent. This paper is the continuation of our previous work on ensemble subset selection [A. Ulas, M. Semerci, O.T. Yildiz, E. Alpaydin, Incremental construction of ... -
Incremental construction of classifier and discriminant ensembles
Ulaş, Aydın; Semerci, Murat; Yıldız, Olcay Taner; Alpaydın, Ahmet İbrahim Ethem (Elsevier Science Inc, 2009-04-15)We discuss approaches to incrementally construct an ensemble. The first constructs an ensemble of classifiers choosing a subset from a larger set, and the second constructs an ensemble of discriminants, where a classifier ... -
Mapping classifiers and datasets
Yıldız, Olcay Taner (Pergamon-Elsevier Science Ltd, 2011-04)Given the posterior probability estimates of 14 classifiers on 38 datasets, we plot two-dimensional maps of classifiers and datasets using principal component analysis (PCA) and Isomap. The similarity between classifiers ... -
Model selection in omnivariate decision trees using Structural Risk Minimization
Yıldız, Olcay Taner (Elsevier Science Inc, 2011-12-01)As opposed to trees that use a single type of decision node, an omnivariate decision tree contains nodes of different types. We propose to use Structural Risk Minimization (SRM) to choose between node types in omnivariate ... -
A novel kernel to predict software defectiveness
Yıldız, Olcay Taner; Okutan, Ahmet (Elsevier Science Inc, 2016-09)Although the software defect prediction problem has been researched for a long time, the results achieved are not so bright. In this paper, we propose to use novel kernels for defect prediction that are based on the ... -
Omnivariate rule induction using a novel pairwise statistical test
Yıldız, Olcay Taner (IEEE Computer Soc, 2013-09)Rule learning algorithms, for example, RIPPER, induces univariate rules, that is, a propositional condition in a rule uses only one feature. In this paper, we propose an omnivariate induction of rules where under each ... -
On the feature extraction in discrete space
Yıldız, Olcay Taner (Elsevier Sci Ltd, 2014-05)In many pattern recognition applications, feature space expansion is a key step for improving the performance of the classifier. In this paper, we (i) expand the discrete feature space by generating all orderings of values ... -
Parallel univariate decision trees
Yıldız, Olcay Taner; Dikmen, Onur (Elsevier B.V., 2007-05-01)Univariate decision tree algorithms are widely used in data mining because (i) they are easy to learn (ii) when trained they can be expressed in rule based manner. In several applications mainly including data mining, the ... -
Quadratic programming for class ordering in rule induction
Yıldız, Olcay Taner (Elsevier Science BV, 2015-03-01)Separate-and-conquer type rule induction algorithms such as Ripper, solve a K>2 class problem by converting it into a sequence of K - 1 two-class problems. As a usual heuristic, the classes are fed into the algorithm in ... -
Software defect prediction using Bayesian networks
Okutan, Ahmet; Yıldız, Olcay Taner (Springer, 2014-02)There are lots of different software metrics discovered and used for defect prediction in the literature. Instead of dealing with so many metrics, it would be practical and easy if we could determine the set of metrics ... -
Tree Ensembles on the induced discrete space
Yıldız, Olcay Taner (Institute of Electrical and Electronics Engineers Inc., 2016-05)Decision trees are widely used predictive models in machine learning. Recently, K-tree is proposed, where the original discrete feature space is expanded by generating all orderings of values of k discrete attributes and ... -
A tree-based approach for English-to-Turkish translation
Bakay, Özge; Avar, Begüm; Yıldız, Olcay Taner (Tubitak Scientific & Technical Research Council Turkey, 2019)In this paper, we present our English-to-Turkish translation methodology, which adopts a tree-based approach. Our approach relies on tree analysis and the application of structural modification rules to get the target side ... -
Türkçe WordNet oluşturulması ve makine çevirisinde kullanılması
Yıldız, Olcay Taner (Tübitak, 2019-12)Princeton kelime ağının üretilmesinden beri, diğer dillerde birçok kelime ağı üretilmiştir. Türkçe için en kapsamlı kelime ağı olan KeNet şu anda 80,000 synset içermektedir. Bu synsetler birbirleriyle anlamsal ve diller ... -
Univariate decision tree induction using maximum margin classification
Yıldız, Olcay Taner (Oxford Univ Press, 2012-03)In many pattern recognition applications, first decision trees are used due to their simplicity and easily interpretable nature. In this paper, we propose a new decision tree learning algorithm called univariate margin ... -
VC-dimension of univariate decision trees
Yıldız, Olcay Taner (IEEE-INST Electrical Electronics Engineers Inc, 2015-02-25)In this paper, we give and prove the lower bounds of the Vapnik-Chervonenkis (VC)-dimension of the univariate decision tree hypothesis class. The VC-dimension of the univariate decision tree depends on the VC-dimension ...
