Toplam kayıt 45, listelenen: 1-20

  • Algebraic break of a cryptosystem based on discretized two-dimensional chaotic maps 

    Solak, Ercan; Çokal, Cahit (Elsevier Science BV, 2009-03-30)
    Recently, a cryptosystem based on two-dimensional discretized chaotic maps was proposed [T. Xiang, et al., Phys. Lett. A 364 (2007) 252]. In this Letter, we cryptanalyze the proposal using algebraic methods. We give three ...
  • Algebraic break of image ciphers based on discretized chaotic map lattices 

    Solak, Ercan; Çokal, Cahit (ELSEVIER SCIENCE INC, 2011-01)
    In this paper, we provide an algebraic cryptanalysis of a recently proposed chaotic image cipher. We show that the secret parameters of the algorithm can be revealed using chosen-plaintext attacks. Our attack uses the orbit ...
  • Assessment of algorithms for mitosis detection in breast cancer histopathology images 

    Veta, Mitko; Van Diest, Paul J.; Willems, Stefan Martin; Wang, Haibo; Madabhushi, Anant; Cruz-Roa, Angel; Gonzalez, Fabio; Larsen, Anders Boesen Lindbo; Vestergaard, Jacob Schack Chack; Dahl, Anders Bjorholm; Cireşan, Dan Claudiu; Schmidhuber, Jürgen U.; Giusti, Alessandro; Gambardella, Luca M.; Tek, Faik Boray; Walter, Thomas C.; Wang, Chingwei; Kondo, Satoshi; Matuszewski, Bogdan J.; Precioso, Frédéric; Snell, Violet; Kittler, Josef; De Campos, Teofilo E.; Khan, Adnan M.; Rajpoot, Nasir Mahmood; Arkoumani, Evdokia; Lacle, Miangela M.; Viergever, Max A.; Pluim, Josien P W (ELSEVIER SCIENCE BV, 2015-02)
    The proliferative activity of breast tumors, which is routinely estimated by counting of mitotic figures in hematoxylin and eosin stained histology sections, is considered to be one of the most important prognostic markers. ...
  • Breaking an orbit-based symmetric cryptosystem 

    Solak, Ercan; Rhouma, Rhouma; Belghith, Safya Mdimegh (Pergamon-Elsevier Science LTD, 2011-09)
    We report a break for a recently proposed class of cryptosystems. The cryptosystem uses constant points of a periodic secret orbit to encrypt the plaintext. In order to break the system, it suffices to sort the constant ...
  • Colored simultaneous geometric embeddings and universal pointsets 

    Brandes, Ulrik; Erten, Cesim; Estrella-Balderrama, Alejandro; Fowler, J. Joseph; Frati, Fabrizio; Geyer, Markus; Gutwenger, Carsten; Hong, Seok-Hee; Kaufmann, Michael; Kobourov, Stephen G.; Liotta, Giuseppe; Mutzel, Petra; Symvonis, Antonios (SPRINGER, 2011)
    Universal pointsets can be used for visualizing multiple relationships on the same set of objects or for visualizing dynamic graph processes. In simultaneous geometric embeddings, the same point in the plane is used to ...
  • Comment on "Encryption and decryption of images with chaotic map lattices" [Chaos 16, 033118 (2006)] 

    Solak, Ercan; Çolak, Cahit (AMER INST PHYSICS, CIRCULATION & FULFILLMENT DIV, 2008-09)
    In this paper, we comment on the chaotic encryption algorithm proposed by A. N. Pisarchik et al. [Chaos 16, 033118 (2006)]. We demonstrate that the algorithm is not invertible. We suggest simple modifications that can ...
  • Comment on "Modified Baptista type chaotic cryptosystem via matrix secret key" [Phys. Lett. A 372 (2008) 5427] 

    Rhouma, Rhouma; Solak, Ercan; Arroyo, David; Li, Shujun; Alvarez, Gonzalo; Belghith, Safya Mdimegh (ELSEVIER SCIENCE BV, 2009-09-07)
    In this comment, we analyze a recently proposed Baptista-like cryptosystem and show that it is not invertible. Others weaknesses are also reported. A modified version of this cryptosystem is proposed to show how to overcome ...
  • 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, 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 a chaos-based image encryption algorithm 

    Çokal, Cahit; Solak, Ercan (ELSEVIER SCIENCE BV, 2009-03-30)
    A chaos-based image encryption algorithm was proposed in [Z.-H. Guan, F. Huang, W. Guan, Phys. Lett. A 346 (2005) 153]. In this Letter, we analyze the security weaknesses of the proposal. By applying chosen-plaintext and ...
  • Cryptanalysis of a cryptosystem based on discretized two-dimensional chaotic maps 

    Solak, Ercan; Çolak, Cahit (ELSEVIER SCIENCE BV, 2008-11-17)
    Recently, an encryption algorithm based on two-dimensional discretized chaotic maps was proposed [Xiang et al., Phys. Lett. A 364 (2007) 252]. In this Letter, we analyze the security weaknesses of the proposal. Using the ...
  • Cryptanalysis of a multi-chaotic systems based image cryptosystem 

    Solak, Ercan; Rhouma, Rhouma; Belghith, Safya Mdimegh (ELSEVIER SCIENCE BV, 2010-01-15)
    This paper is a cryptanalysis of a recently proposed multi-chaotic systems based image cryptosystem. The cryptosystem is composed of two shuffling stages parameterized by chaotically generated sequences. We propose and ...
  • Cryptanalysis of a new substitution-diffusion based image cipher 

    Rhouma, Rhouma; Solak, Ercan; Belghith, Safya Mdimegh (ELSEVIER SCIENCE BV, 2010-07)
    This paper introduces two different types of attacks on a recently proposed cryptosystem based on chaotic standard and logistic maps. In the two attacks, only a pair of (plaintext/ciphertext) was needed to totally break ...
  • Cryptanalysis of Fridrich\'s chaotic image encryption 

    Solak, Ercan; Çokal, Cahit; Yıldız, Olcay Taner; Bıyıkoğlu, Türker (WORLD SCIENTIFIC PUBL CO PTE LTD, 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 ...
  • Cryptanalysis of image encryption with compound chaotic sequence 

    Solak, Ercan (IEEE, 2009)
    Recently, an image encryption algorithm based on compound chaotic sequence was proposed [Tong et al., Image and Vision Computing 26 (2008) 843]. In this paper, we analyze the security weaknesses of the proposal. We give ...
  • 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 ...
  • Differentially private attribute selection for classification 

    Var, Esra; İnan, Ali (GAZI UNIV, FAC ENGINEERING ARCHITECTURE, 2018)
    Selecting a relevant subset of attributes is one of the most important data preprocessing steps of data mining and machine learning solutions. For the classification task, selection is based on the correlation between an ...
  • 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 ...
  • Facial expression recognition based on anatomy 

    Eskil, Mustafa Taner; Benli, Kristin Surpuhi (Academic Press INC Elsevier Science, 2014-02)
    In this study, we propose a novel approach to facial expression recognition that capitalizes on the anatomical structure of the human face. We model human face with a high-polygon wireframe model that embeds all major ...