Fen Bilimleri Enstitüsü: Recent submissions

  • Energy-efficient routing for wireless sensor networks with a mobile sink 
    Tunca, Can. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2012., 2012.)
    The concentration of data tra c towards the sink in a wireless sensor network causes the nearby nodes to deplete their batteries quicker than other nodes, which leaves the sink stranded and disrupts the sensor data reporting. ...
  • Fusing local appearance mosdels for face recognition 
    Arar, Nuri Murat. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2012., 2012.)
    Face recognition is a popular research area due to its scienti c challenges and potential applications. Therefore, it attracts attention from both diverse research communities and the industry for several years. Various ...
  • Probabilistic tensor factorization for link prediction 
    Ermiş, Beyza. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2012., 2012.)
    Link prediction is the problem of inferring the presence, absence or strength of a link between two entities, based on properties of the other observed links. In the literature, two related types of link prediction problems ...
  • Cross-pose facial expression recognition 
    Güney, Fatma. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2012., 2012.)
    Automatic facial expression recognition is a popular research topic due to its interesting applications in a wide variety of areas. The existing studies have achieved high accuracies in various formulations of the same ...
  • Biclustering using nonparametric Bayesian methods 
    Çelik, Safiye. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2012., 2012.)
    Multiway clustering is a popular analysis method due to its several potential applications. Various techniques have been developed to cluster di erent entities of a data matrix simultaneously by taking relational entries ...
  • Physical layer issues of communication via diffusion for bio-nanomachines 
    Kuran, Mehmet Şükrü. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2012., 2012.)
    Nanonetworking is a new communication paradigm that focuses on communication between nanomachines. Among the various methods that are being proposed in the context of this paradigm, we focus on the Communication via Diffusion ...
  • Development of a new domain-specific language for software architecture specification : DSL-SA 
    Akar, Sezer. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2012., 2012.)
    The specification of software structures that conform to specific software architectures is the first step in software design during software development. Software structure may be the first design artifact that becomes ...
  • Using Dec-POMDP algorithms to solve multi-agent decision problems in robot soccer 
    Aşık, Okan. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2012., 2012.)
    Decentralized Partially Observable Markov Decision Process (Dec-POMDP) is a recent mathematical framework which has been used to model multi-agent coordination and decision making. However, its real life applications are ...
  • Parallel implementation of a VQ-based text-independent speaker identification 
    Soğancı, Ruhsar. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2004., 2004.)
    Automatic user identification is an indispensable part of today's computer based applications. Passwords and keys are common solutions due to their ease of implementation and low cost, but these solutions also contain the ...
  • Shadow height maps for terrain shadowing 
    Biçici, Ufuk Can. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2012., 2012.)
    Shadowing terrains is a challenging problem. Mainstream shadowing algorithms like shadow volumes and shadow maps, do not work very well with height map geometry. Shadow volumes need silhouette extraction which is a very ...
  • Fuzzy logic based congestion control for progressive image transmission over wireless sensor networks 
    Sönmez, Çağatay. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2012., 2012.)
    The availability of low-cost camera hardware has enabled the Wireless Multimedia Sensor Networks (WMSNs), and has made it possible to develop multimedia applications such as surveillance systems, traffic control systems, ...
  • A comprehensive analysis of using WordNet, part-of-speech tagging, and word sense disambiguation in text categorization 
    Çelik, Kerem. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2012., 2012.)
    By the huge increase of data volume in the digital environment and the machine learning techniques, studies on automatic categorization of text documents is increased. Text categorization is simply assigning prede ned label ...
  • Feature selection and transfer learning algorithms with applications on credit risk analysis 
    Bozkurt Gönen, Gül Efşan. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2012., 2012.)
    Many financial organizations such as banks and retailers use computational credit risk analysis (CRA) tools heavily due to recent financial crises and more strict regulations. This strategy enables them to manage their ...
  • Spectral methods for outlier detection in machine learning 
    Erdoğan, Göker. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2012., 2012.)
    Outliers are those instances in a sample that deviate signi cantly from the others. Their identi cation bears much importance since they carry valuable and actionable information in many real life scenarios. Spectral methods ...
  • Geometry based hand vein biometry 
    Sağlam, Pınar. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2012., 2012.)
    This thesis documents a study in which new algorithms are developed for geometry based hand vein biometry. Hand vein patterns are assumed not to change over time except in their size, and they are unique to each individual, ...
  • Word polarity detection using a multilingual approach 
    Özsert, Cüneyd Murad. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2012., 2012.)
    Determining polarity of words is an important task in sentiment analysis with applications in several areas such as text categorization and review analysis. In this thesis, we propose a multilingual approach for word ...
  • A content based microblogger recommendation model 
    Çelebi, Hüseyin Burak. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2012., 2012.)
    Social networks are one of the most signi cant information sources on the Internet. People share information, their feelings, their opinions and interesting links. A microblogging system is a special kind of social network ...
  • Robust high - frequency solvers 
    Özen, Hasan Çağan. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2012., 2012.)
    This work concerns the numerical solutions of the direct obstacle scattering problem in R2. To this end, we formulate the problem as an equivalent integral equation. We then review the fundamental numerical methods such ...
  • Graphical user interface customization for the elderly in ambient assisted living environments 
    Torun, Mustafa. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2012., 2012.)
    With the help of the graphical user interfaces (GUI), young people or everyday-computer-users can easily get accustomed to the various digital devices. However, acceptability of GUIs by elderly, as the rapidly growing group ...
  • Forecasting stock market volatility using artificial neural networks 
    Yümlü, Mustafa Serdar. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2004., 2004.)
    Stock markets play a very significant role in the economy of capitalist countries. Millions of people trade everyday in order to have more and more profit. At this point, being able to know the future of the market gets ...

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