Browsing M.S. Theses by Issue Date

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  • Content-oriented negotiation in e-commerce 
    Aydoğan, Reyhan. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2006., 2006.)
    This thesis proposes an approach for automating the content negotiation of services as an alternative to price-oriented negotiation approaches. In content-oriented negotiation, the description of services rather than their ...
  • Credit risk modeling using machine learning techniques 
    Kaya, Murat Emre. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2006., 2006.)
    In this thesis, credit scoring ability of several machine learning techniques were investigated such as multi-layer perceptron (MLP), radial basis function (RBF), knearest neighbor (k-NN) and support vector machines (SVM). ...
  • Efficient storage of olap cubes using a hybrid method 
    Çakmak, Fatih. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2006., 2006.)
    In previous studies about the subject, hybrid methods were developed to benefit from the advantages of both sparse and dense structures for efficient storage of multidimensional OLAP data. In these previous studies, main ...
  • Time efficient spam e-mail filtering for Turkish 
    Çıltık, Ali. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2006., 2006.)
    In the present thesis, we propose spam e-mail filtering methods having high accuracies and low time complexities. The methods are based on the n-gram approach and a heuristics which is referred to as the first n-words ...
  • Group key management in IEEE 802.15.4 wireless networks 
    Yurttutan, Gamze. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2006., 2006.)
    This thesis concentrates on establishing a secure group key management scheme in low data rate wireless personal area networks, namely IEEE 802.15.4 standard. In applications where the transmitted data in group communication ...
  • Super peer web service discovery architecture 
    Ayorak, Evren. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2006., 2006.)
    Web Service discovery is currently performed with centralized registries such as UDDI. But centralized architectures suffer from single-point of failure and scalability. On the other hand, peer-to-Peer (P2P) protocols like ...
  • Intelligent arrhythmia classification based on support vector machines 
    Özkaya, Aslı Uyar. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2006., 2006.)
    The main objective of this study is to provide automatic recognition of arrhythmiccardiac pathologies from the classification of ECG recordings. ECG is a graphical signalwhich is the result of electrical tension of heart ...
  • Compressing mesh geometry using spectral methods and a set partitioning algorithm 
    Konur, Umut. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2006., 2006.)
    The demand for visualizing 3D objects has been growing rapidly in recent years due to the use of 3D models in several contexts and an increasing number of applications such as computer aided design, manufacturing, defense, ...
  • SIxD: |a configurable and customizable SISD/SIMD microprocessor soft core 
    Sönmez, Nehir. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2006., 2006.)
    The demand for FPGA-based processor cores increases as more embedded systems are built on FPGA platforms. The flexible choice is the "soft" processor IP core, a processor implemented in the reconfigurable logic of the FPGA. ...
  • Vision based real-time continuous 3D hand gesture recognition interface for generic applications based on input-output hidden Markov models 
    Keskin, Cem. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2006., 2006.)
    This study focuses on the application of InputOutput Hidden Markov Models (IOHMM) to the recognition of 3D hand gestures that involve both hand motion and hand posture in a stereo visionbased approach. The proposed system ...
  • A defect prediction method for software versioning 
    Kastro, Yomi. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2006., 2006.)
    Software lifecycle is becoming more human-independent with the help of new methodologies and tools. Many of the research in this field focus on defect reduction, defect identification and defect prediction. Defect prediction ...
  • Effect of 3D topographical surfaces for the performance evaluation of wireless sensor networks 
    Arslan, Müzeyyen Gökçen. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2006., 2006.)
    A wireless sensor network (WSN) is a self-organizing network, consisting of tiny wireless nodes which carry out a sensing and transferring task in collaboration. WSNs are getting popular because of their ease of deployment, ...
  • Using polynomial approximations to discover qualitative models 
    Gerçeker, Reha Kamil. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2006., 2006.)
    The set of ordinary differential equations (ODE) of a physical system determines the precise numerical behavior that will be exhibited in the future. Abstracting an ODE into a qualitative differential equation (QDE) system ...
  • Performance evaluation of evolutionary heuristics in dynamic environments 
    Ayvaz, Demet. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2006., 2006.)
    In stationary optimization problems, it is assumed that no changes occur with respect to the problem solved during the course of computation. However many real-world optimization problems are non-stationary (dynamic) and ...
  • Novel methods for security mechanisms and key management techniques in wireless networks based on signcryption and hybrid cryptography 
    Yavuz, Attila Altay. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2006., 2006.)
    Providing security in wireless communication networks is one of the most challenging problems in security systems. Broadcast nature of wireless networks make them more vulnerable to eavesdropping and active attacks when ...
  • Ranking semantic web services using semantic-distance information 
    Şenvar, Mehmet. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2006., 2006.)
    World wide web will gain its full power when semantic meta-data descriptions are added and automatic processing of the web is realized. Web services gained importance in the e-commerce era in recent years. As the number ...
  • Parallel tetrahedral mesh refinement 
    Balman, Mehmet. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2006., 2006.)
    The Adaptive Mesh Refinement is one of the main techniques used for the solutionof Partial Differential Equations. Since 3-dimensional structures are more complex,there are few refinement methods especially for parallel ...
  • İndexing of XML-based encrypted medical documents in worm storage 
    Aksu, Naim. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2006., 2006.)
    Since the medical records are increasingly stored in electronic forms, especially in XML based documents, the storage devices for these records must preserve their trustworthiness. The regularity requirements rely on storing ...
  • Sequence based searching over encrypted outsourced XML data 
    Olgun, Ahmet. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2006., 2006.)
    There has been a considerable interest for securely querying XML data stored on a remote untrusted database server over insecure channels. In order to protect confidential XML data from malicious uses, XML data should be ...
  • Autonomous strategy planning under uncertainty 
    Sardağ, Alp. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2006., 2006.)
    A real world environment is often partially observable for agents either because of noisy sensors or incomplete perception. Autonomous strategy planning under uncer- tainty has two major challenges. The 歔rst one is autonomous ...

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