Tunalı, Turhan

Profile Picture
Profile URL
https://hdl.handle.net/20.500.14365/7014
Name Variants
Tunali, E. Thrhan
Tunali, Emrullah Turhan
Tunali, E. Turhan
Tunali, Turhan
Tunalı, Emrullah Turhan
Job Title
Email Address
turhan.tunali@ieu.edu.tr
Main Affiliation
05.05. Computer Engineering
Status
Current Staff
Website
ORCID ID
0000-0002-0799-4314
Scopus Author ID
6603530790
Turkish CoHE Profile ID
A1257CC7B0B2DFEA
Google Scholar ID
1qg6g3EAAAAJ
WoS Researcher ID
EDD-6315-2022
Files
Turhan_Tunali.jpg (13.32 KB)

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SUSTAINABLE CITIES AND COMMUNITIES
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4

QUALITY EDUCATION
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Documents

40

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251

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Scholarly Output

19

Articles

9

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WoS Citation Count

57

Scopus Citation Count

68

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4

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WoS Citations per Publication

3.00

Scopus Citations per Publication

3.58

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3

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JournalCount
Journal of Vısual Communıcatıon And Image Representatıon2
2012 20th Signal Processing and Communications Applications Conference, SIU 2012, Proceedings1
2013 21st Signal Processing and Communications Applications Conference, SIU 20131
2013 21St Sıgnal Processıng And Communıcatıons Applıcatıons Conference (Sıu)1
2015 Internatıonal Conference on Optıcal Network Desıgn And Modelıng (Ondm)1
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Now showing 1 - 10 of 19
  • Thumbnail Image
    Article
    Citation - WoS: 2
    Citation - Scopus: 2
    A Comparative Path Establishment Study on Routing Performance of Mlr Wdm Optical Networks
    (Wiley, 2019) Algın, Gül Boztok; Tunali, Emrullah Turhan
    In this paper, we investigate the effect of path establishment method priorities over routing performance in mixed line rate (MLR) wavelength division multiplexed (WDM) optical networks. The survivable routing with rate and wavelength assignment (SRRWA) problem is presented and an efficient shared backup path protection solution is proposed. We prepared detailed simulation scenarios with all possible prioritizations and observed their performances. The simulation results show that assigning higher priority to single hop methods as compared with multi-hop methods yields better performance. In both methods, it has been observed that assigning higher priority to grooming reduces the communication cost and the traffic blocking ratio while enhancing the resource utilization.
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    Conference Object
    Citation - WoS: 1
    Citation - Scopus: 1
    An Efficient Jsd-Based Search on Interest-Based Hierarchical Clustering of Overlay Networks
    (Iaria Xps Press, 2010) Bulut, Hasan; Yardimci, Asil; Demirci, Sercan; Kaymak, Yagiz; Fesci-Sayit, Muge; Tunali, E. Turhan
    In P2P networks, peers share contents, especially video files, which represent their interests. However, the underlying P2P topology may not represent this interest distribution. Thus, one important aspect of constructing an efficient P2P network is to exploit the interest similarity among peers. In this paper, we propose a hierarchical clustering mechanism for constructing an overlay network that takes interest similarity among peers into account. By measuring the similarity among interests of peers and clusters, interest-based hierarchical clusters are formed by using Jensen-Shannon Divergence metric. The clustering performance metrics, accuracy and correctness, are reported on PlanetLab. For limited keyword collections, a novel Jensen-Shannon Divergence-based search mechanism is implemented. It has been observed that the integrated mechanism provides an efficient method and better performance as compared to classical keyword-based search.
  • Thumbnail Image
    Article
    Citation - WoS: 6
    Citation - Scopus: 5
    Adaptive, Incentive and Scalable Dynamic Tree Overlay for P2p Live Video Streaming
    (Springer, 2016) Sayit, Muge; Demirci, Sercan; Kaymak, Yagiz; Tunali, E. Turhan
    In this paper, we propose a new multicast tree framework to be used in peer-to-peer (P2P) live video streaming systems. The proposed system, adapts the tree links under high peer churn and runs in a totally distributed manner. In order to provide this dynamism and seamless streaming at the same time, we propose a cross layer design involving scalable video codec, backup parents and hierarchical clusters. The performance of the system is measured in real world environment PlanetLab that has nodes distributed all over the world. The experiments show that the proposed system provides high quality of experience (QoE) in terms of Peak Signal to Noise Ratio (PSNR), playback delay and duration of pauses. The proposed system also provides incentive mechanism to its users.
  • Thumbnail Image
    Conference Object
    Citation - WoS: 3
    Citation - Scopus: 3
    Dedicated Path Protection in Mixed-Line Optical Wdm Networks
    (IEEE, 2013) Algın, Gül Boztok; Tunali, E. Turhan
    As data communication based internet usage increased; the need for high speed communication networks have emerged. Networks must service diverse variety of traffic requirements with different service demands. Recent studies have shown that optical WDM networks with MLR support efficiently respond to these requirements. In this study, we address the problem of survivable routing with wavelength and rate assignment (RWA) in MLR optical networks. A WDM MLR optical network with dedicated path protection scheme is designed and compared with SLR networks in terms of cost. Our results show that the usage of MLR property provides new opportunities and ease to solve RWA and survivability problems.
  • Thumbnail Image
    Conference Object
    Educational Technology Eroding National Borders
    (2011) Siddiqui, Khalid Javed; Singh G.; Tunali T.
    Businesses are continuously forced to reeducate and train their new workforce before they can be productive. The existing employees also need to improve their skills or retrain for promotion/growth. To cater to this breed of students "schooling business" is also faced with an inescapable demand to design new programs/courses. The growth in educational technology is also influencing academic institutions to redefine their endeavors in terms of producing learning while providing instructions. With the growing demand for higher education such endeavors are crossing the physical boundaries of many countries. We are using online and hybrid learning models to attract traditional, distance and international students. A major component of this model is the web-based course management system that provides an environment for teaching/learning and interaction 24/7. This model optimally combines interactive-classroom, web-based lectures and traditional instructions and has successfully offered courses at SUNY-Fredonia with students registering from around the globe. This model is presented and the opportunities and challenges of web technologies in education are discussed. © 2011 Springer-Verlag.
  • Thumbnail Image
    Conference Object
    Citation - WoS: 1
    Citation - Scopus: 1
    A Cost Efficient Line Rate Assignment Strategy for Mlr Wdm Optical Networks
    (IEEE, 2015) Algın, Gül Boztok; Tunali, E. Turhan
    Recent studies have shown that optical WDM networks with mixed line rate (MLR) support efficiently respond to diverse variety of traffic requirements having different service demands. In MLR WDM optical networks, an intelligent line rate selection strategy can enable cost efficient resource allocations for routing, rate and wavelength assignment problem. In this work, we propose a learning based line rate assignment strategy that reduces communication cost and bandwidth blocking ratio. Performances of three variations of the proposed strategy are compared with maximum and minimum line rate assignment strategies of the literature through simulations. Results show that performance can be improved with the proposed algorithm.
  • Thumbnail Image
    Conference Object
    Citation - Scopus: 2
    A Dynamic Line Rate Assignment Strategy for Mlr Wdm Optical Networks
    (Institute of Electrical and Electronics Engineers Inc., 2018) Algin G.B.; Tunalı, Turhan
    In this study, we propose a new dynamic line rate assignment strategy that responds to load intensity fluctuations of daily traffic in wavelength-division-multiplexed (WDM) mixed-line-rate (MLR) optical networks. We present Survivable Routing with Rate and Wavelength Assignment (SRRWA) and we propose an efficient shared backup path protection solution for dynamic traffic model. We prepared simulation scenarios to demonstrate the effect of handling load intensity periods over routing performance in terms of communication cost and resource utilization. We compared the results of the proposed strategy with static line rate assignment methods. The simulation results show that proposed strategy has an average performance while highest resource utilization and lowest cost values are obtained by the static rate matching line rate assignment method. © 2017 IEEE.
  • Thumbnail Image
    Conference Object
    Citation - Scopus: 1
    A Comparative Study of Compressed Sensing Video Encoding Gop Patterns for Stereo Distributed Video Coding
    (2012) Aslan S.; Tunalı, Turhan
    In this study, compressed sensing concepts are applied to multi-view video coding. Existing work from single view video is utilized to develop efficient GOP patterns and reference framing for stereo coding. It has been observed that the most typical choice of pattern improved the characteristics 0.4 dB with respect to the model that do not benefit from interview sparsity for all frames. Alternatives for future work are proposed. © 2012 IEEE.
  • Thumbnail Image
    Article
    Citation - WoS: 17
    Citation - Scopus: 20
    Scalable Video Encryption of H.264 Svc Codec
    (Academic Press Inc Elsevier Science, 2011) Algın, Gül Boztok; Tunalı, Turhan
    A new algorithm for encrypting H.264 SVC (Scalable Video Codec) video data is developed. Security requirements of encoded video are examined together with constraints arising from structural properties of the SVC software. Performance analysis of the new algorithm is reported and its strength against cryptanalysis attacks is discussed. It has been demonstrated that the new algorithm has almost no overhead with low level encryption and acceptable overhead for high level encryption that leads to totally unperceivable video. (C) 2011 Elsevier Inc. All rights reserved.
  • Thumbnail Image
    Article
    Citation - WoS: 9
    Citation - Scopus: 10
    Resilient Peer-To Streaming of Scalable Video Over Hierarchical Multicast Trees With Backup Parent Pools
    (Elsevier, 2012) Fesci-Sayit, Muge; Tunali, E. Turhan; Tekalp, A. Murat
    This paper introduces a new cross layer tree-based peer-to-peer design using hierarchical cluster layers and a new method for selection of backup parent pools for resilient streaming of scalable video to provide highest quality of experience for all peers. Backup parent pools are selected during the process of multicast tree construction based on information provided by the hierarchical clusters. The proposed tree construction method aims to minimize bottlenecks that may be caused by non-leaf nodes with low upload bandwidth. Performance of the proposed system is demonstrated by extensive test results using a wide range of simulation scenarios. Comparison of the results with those of some recent works indicates that the proposed system is clearly superior in several aspects. (C) 2011 Elsevier B.V. All rights reserved.