Browsing by Author "Alagöz, Fatih."

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  • A biometric authentication technique using spread spectrum audio watermarking 
    Can, Yekta Said. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2014., 2014.)
    Watermarking has become important in the last decade because of the copyright protection applications. Embedding information into an audio le is more di cult as compared to images, because human auditory system is more ...
  • A blockchain based group key agreement protocol (B-GKAP) 
    Taçyıldız, Yaşar Berkay. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2020., 2020.)
    Group key agreement protocols are crucial in the case of multiple parties agreeing on a common key without a centralized entity. However, the decentralized characteristic of these protocols causes performance challenges ...
  • A new lane detection system for unmanned vehicles 
    Timar, Yasemin. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2010., 2010.)
    As the intelligent transportation technologies have rapidly been improving, it is plausible to state that intelligent ground vehicles will be on the roads driving through the tra c in the near future. Moreover, intelligent ...
  • A scheduling model for centralized cognitive radio networks 
    Gözüpek, Didem. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2012., 2012.)
    In this thesis, we present a scheduling model for centralized cognitive radio networks. Our model consists of a set of schedulers that focus on the data transmission of the secondary users and determine with which frequency, ...
  • Adaptive routing algorithm for vehicular networks in city environment 
    Özsahakyan, B. Loran. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2011., 2011.)
    The most known position based routing protocol for high mobile vehicular ad-hoc networks is the Greedy Perimeter Stateless Routing (GPSR) protocol. This protocol contains two routing modes, the greedy mode and the recovery ...
  • Authenticated quality of service awere routing in software defined networks 
    Aytaç, Samet. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2019., 2019.)
    Quality of Service (QoS) aware routing is an ongoing and major problem for traditional networks since they are not able to manage network traffic for an immense variety of users due to their inflexible and static architectures. ...
  • Channel selection and assignment schemes for efficient spectrum sharing and energy efficiency in cognitive radio networks 
    Bayhan, Suzan. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2012., 2012.)
    In this thesis, we focus on distributed channel selection and centralized channel assignment in cognitive radio networks (CRN). For the former topic, we are concerned with the efficiency of spectrum sharing whereas in the ...
  • Content-centric and spectrum sharing heterogeneous wireless networks 
    Kafıloğlu, Sebahat Sinem. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2021., 2021.)
    The surging multimedia content demand has put wireless network systems under heavy energy consumption burden in an unprecedented manner. Besides, wireless net works are urged to the limits of service capacity due to the ...
  • Controller load balancing schemes in software defined networks 
    Selvi, Hakan. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2015., 2015.)
    Software-de ned networking (SDN) has been proposed as a new networking paradigm which separates the control and data forwarding planes. The controllers which are centralized network control entities are crucial for meeting ...
  • Cost-aware network hardening using compact attack graphs 
    Yiğit, Beytüllah. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2014., 2014.)
    Attack graphs provide analytical support to prevent multistep network attacks by showing all possible sequences of vulnerabilities and their interactions. Since at- tack graphs generally consist of a very large number of ...
  • Cyclic map information element in Wimax networks 
    Canarslan, Hasan. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2008., 2008.)
    Broadband Wireless Access (BWA) is an alternative to wired broadband like cable and xDSL. The IEEE 802.16 standard defines physical (PHY) and MAC layers of BWA systems. It has been called WiMAX (Worldwide Interoperability ...
  • Effect of social relations on cooperative sensing in cognitive radio networks 
    Güven, Mehmet Can. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2013., 2013.)
    Previous works in cognitive radio networks (CRNs) have shown that cooperation in sensing improves sensing reliability and in turn enhances the network throughput. Although this altruistic cooperative behavior is accepted ...
  • Energy efficiency analysis and modeling of cognitive and heterogeneous wireless networks 
    Gür, Gürkan. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2013., 2013.)
    The surging energy costs and the environmental consequences of energy generation and exploitation have put energy e ciency aspect of wireless systems into focus in an unprecedented manner. Moreover, the capacity expectations ...
  • Environment aware location estimation in cellular networks 
    Türkyılmaz, Onur. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2007., 2007.)
    Location Based Services (LBS) enable personalized services to the mobile subscribers based on their current position and consequently it has received significant attention in both research and industry over the past few ...
  • Error concealment for speech over noisy channels by using audio watermarking 
    Er, Fatih. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2008., 2008.)
    In this thesis, the author presents a novel error concealment method of speech for noisy channels using audio watermarking. The proposed error concealment algorithm abbreviated as ECAW is basically a LSB-based scheme and ...
  • Filtering based defense mechanisms against DDOS attacks for core networks 
    Kalkan, Kübra. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2016., 2016.)
    In this thesis, we present filtering based defense mechanisms against Distributed Denial of Service (DDoS) attacks for core networks. Initially, several filtering techniques are analyzed and their advantages and disadvantages ...
  • 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 ...
  • 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 ...
  • Heuristic algorithms for scheduling in centralized cognitive radio networks 
    Eraslan, Başak. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2011., 2011.)
    In this thesis we propose heuristic scheduling algorithms for the centralized, time slotted cognitive radio network (CRN) model in [1]. In the considered CRN scheme, a frequency f and time slot t pair constitutes a resource ...
  • Joint optimization of cash management and routing for new generation automated teller machine networks 
    Batı, Şeyma. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2016., 2016.)
    Cash related costs constitute a large portion of management cost of an Automated Teller Machine (ATM) network. Cash should be loaded to or taken from ATM devices in certain intervals in order to both meet customer satisfaction ...

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