Researcher:
Ünlütürk, Bige Deniz

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Bige Deniz

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Ünlütürk

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Ünlütürk, Bige Deniz

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2013 - 20175

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Researcher Of Publications: search.filters.isAuthorOfPublication.f627858e-9900-4102-8288-14ccf40b2294

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    Rate-delay tradeoff with network coding in molecular nanonetworks
    (IEEE-Inst Electrical Electronics Engineers Inc, 2013) N/A; N/A; Department of Electrical and Electronics Engineering; Department of Electrical and Electronics Engineering; Ünlütürk, Bige Deniz; Malak, Derya; Akan, Özgür Barış; Master Student; PhD Student; Faculty Member; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; College of Engineering; N/A; N/A; 6647
    Molecular communication is a novel nanoscale communication paradigm, in which information is encoded in messenger molecules for transmission and reception. However, molecular communication is unreliable and has highly varying long propagation delays mainly due to the stochastic behavior of the freely diffusing molecules. Thus, it is essential to analyze its delay characteristics, as well as the tradeoff between the rate and delay, in order to reveal the capabilities and limitations of molecular information transmission in nanonetworks. In this paper, first, a new messenger-based molecular communication model, which includes a nanotransmitter sending information to a nanoreceiver, is introduced. The information is encoded on a polyethylene molecule, CH3(CHX)(n)CH2F, where X stands for H and F atoms representing 0 and 1 bits, respectively. The emission of the molecules is modeled by puffing process which is inspired by the alarm pheromone release by animals in dangerous situations. In this work, the rate-delay characteristics of this messenger-based molecular communication model are explored. Then, a Nano-Relay is inserted in the model, which XOR's the incoming messages from two different nanomachines. Performance evaluation shows that indeed, a simple network coding mechanism significantly improves the rate given delay of the system, and vice versa.
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    Modulation in molecular communications: a look on methodologies
    (Springer, 2017) N/A; N/A; N/A; Department of Electrical and Electronics Engineering; Department of Electrical and Electronics Engineering; Pehlivanoğlu, Ecehan Berk; Ünlütürk, Bige Deniz; Akan, Özgür Barış; PhD Student; PhD Student; Faculty Member; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; College of Engineering; N/A; N/A; 6647
    Nanonetworking is a recently proposed paradigm that aims to achieve collaboration between nanomachines to carry out complex tasks. Molecular communications has been the most vibrant area of research for nanonetworking, mostly because of its feasibility and existence of communication schemes similar to molecular communications in nature. In molecular communications, two nanomachines communicate with each other via propagation of molecules from the transmitter to the receiver nanomachines through the medium they reside in. How and where to encode the message, i.e. modulation, plays a key role in molecular communications since it greatly affects the communication performance at nanoscale. To this end, in this paper, we examine the landscape of modulation in molecular communications, categorize the modulation schemes in molecular communications by methodology and discuss how convenient they are in terms of synchronization requirements in a nanoscale environment and their biocompatibility for applications inside human body.
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    Video streaming over software defined networks with server load balancing
    (IEEE, 2015) N/A; Department of Electrical and Electronics Engineering; N/A; Department of Electrical and Electronics Engineering; Nacaklı, Selin; Tekalp, Ahmet Murat; Ünlütürk, Bige Deniz; PhD Student; Faculty Member; Master Student; Graduate School of Sciences and Engineering; College of Engineering; Graduate School of Sciences and Engineering; N/A; 26207; N/A
    Software Defined Networking is a promising Internet architecture to deliver multimedia with end-to-end quality of service (QoS) since it enables optimal dynamic management of network resources and on-demand QoS provisioning by a network operator. We propose a framework for server load-balancing over a single-operator OpenFlow network to improve the quality of service levels of video streaming services. We design a new OpenFlow controller application for dynamic server load balancing by continuous monitoring of load of each video server and dynamic rerouting of clients to alternate servers with lower loads when an overload condition is detected. The proposed controller application is implemented on top of an open source OpenDaylight controller. Our results show that the proposed load-balancer improves the quality of streaming video experienced by end-users, and OpenFlow provides a powerful framework to provide video services with end-to-end quality of service over the future Internet.
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    Molecular channel model with multiple bit carrying molecules
    (IEEE, 2013) N/A; N/A; Department of Electrical and Electronics Engineering; Department of Electrical and Electronics Engineering; Ünlütürk, Bige Deniz; Pehlivanoğlu, Ecehan Berk; Akan, Özgür Barış; PhD Student; PhD Student; Faculty Member; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; College of Engineering; N/A; N/A; 6647
    Molecular communication is a bio-inspired paradigm, proposed to communicate nanomachines via diffusion of molecules through an aqueous medium. the type and structure of the molecules to be propagated bear great importance since they directly affect the modulation structure of molecular communication. We propose a messenger-based molecular communication model where information is encoded on the atoms of polyethylene molecules in the form of CH3(CHX)(n)CH2F, where X is either an H or F atom, representing 0 and 1 bits, respectively. the encoded polyethylene molecules are released from the transmitter nanomachine, and their propagation towards the receiver is modelled as a Brownian Motion. Using an erasure channel model, our analysis focuses on calculating the capacity of this channel and revealing the parameters affecting it such as molecule size and number of redundant molecules for one transmission.
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    PublicationOpen Access
    Molecular channel model with multiple bit carrying molecules
    (Institute of Electrical and Electronics Engineers (IEEE), 2013) Ünlütürk, Bige Deniz; Pehlivanoğlu, Ecehan Berk; Akan, Özgür Barış; PhD Student; Faculty Member; College of Engineering
    Molecular communication is a bio-inspired paradigm, proposed to communicate nanomachines via diffusion of molecules through an aqueous medium. The type and structure of the molecules to be propagated bear great importance since they directly affect the modulation structure of molecular communication. We propose a messenger-based molecular communication model where information is encoded on the atoms of polyethylene molecules in the form of CH3(CHX)(n)CH2F, where X is either an H or F atom, representing 0 and 1 bits, respectively. The encoded polyethylene molecules are released from the transmitter nanomachine, and their propagation towards the receiver is modelled as a Brownian Motion. Using an erasure channel model, our analysis focuses on calculating the capacity of this channel and revealing the parameters affecting it such as molecule size and number of redundant molecules for one transmission.