Fen Bilimleri Enstitüsü: Recent submissions

  • 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, ...
  • 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 ...
  • 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 ...
  • 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 ...
  • Software effort estimation using machine learning methods 
    Başkeleş, Bilge. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2006., 2006.)
    In software engineering, the main aim is to develop projects that produce the desired results within limited schedule and budget. There are many factors that affect the budget of a project. The most important factor that ...
  • Deadlock detection problem in computing systems :|a simulation approach using a priority based deadlock detection algorithm 
    Akgün, Sema F. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 1989., 1989.)
    In this thesis, the deadlock detection problem in computing systems is examined in detail. Deadlock models and some published algorithms on deadlock detection are discussed. A modified priority based algorithm is introduced ...
  • 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). ...
  • Problems of adiabatic quantum program design 
    Khusnitdinova, Evgeniya. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2006., 2006.)
    Although several quantum programming languages have already been proposed, none of these are based on the newly discovered adiabatic evolution approach. We acknowledge the main problem in adiabatic quantum computation to ...
  • 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. ...
  • 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 ...
  • Handover management algorithms in LEO satellite communication networks 
    Tüysüz, Ayşegül. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2006., 2006.)
    Since Low Earth Orbit (LEO) satellite constellations have important advantages over Geosynchronous Earth Orbit (GEO) satellite systems such as low propagation delay, low power requirements and more efficient spectrum ...
  • 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 ...
  • VoIP performance in NGEO satellite IP networks with on-board processing capability 
    Bayhan, Suzan. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2006., 2006.)
    In this thesis study, an adaptive routing policy utilizing the real-time network information of a two-layered satellite network is introduced. In a satellite network, de- pending on the requirements and properties of ...
  • 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 ...
  • Incremental learning with ensemble based SVM classifiers for non-stationary environments 
    Yalçın, Aycan. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2006., 2006.)
    In this thesis, we evaluate the performance of support vector machines (SVM) ensemble, which is constructed by using Learn++ algorithm, on changing environment and propose incorporating forgetting mechanism to adapt this ...
  • Handovers in wireless overlay networks 
    Yıldırım, Meltem. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2006., 2006.)
    Wireless Overlay Networks (WONs) are multi-layer networks in which mobile nodes (MNs) move freely within cells of the same overlay or between cells of different overlays. Such a structure provides global access to MNs ...
  • Generating causal relations from mathematical models 
    Güngör, Tunga. (Thesis (M.S.)- Bogazici University. Institute for Graduate Studies in Science and Engineering, 1989., 1989.)
    System analysis is an important topic for many scientific disciplines. By a system, we mean an orderly, interconnected arrangement of parts describing a phenomenon. The formal representation of systems is done through ...
  • 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 ...
  • 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 ...
  • 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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