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Dr. ONUR ALPARSLAN

SM-IEEE
Post-doctoral Researcher

About Me

Biography

I received B.S. and M.S. degrees from Bilkent University, Ankara, Turkey, in 2002 and 2005, in electrical and electronics engineering. I received Ph.D. degree from Osaka University, Japan, in information science and technology, in 2008. I was the recipient of Monbukagakusho Graduate Scholarship from the Ministry of Education, Science, Sports and Culture of Japan between 2005–2008. I am a post-doctoral researcher at Osaka University since 2008. My research interests are network function virtualization (NFV), neural networks, optical networks, traffic engineering and simulation. I have worked on several government funded projects on computer networks and telecommunications in Europe and Japan. I was the recipient of "Best Paper Award" at the First International Conference on Evolving Internet (INTERNET 2009). I am the editor of IEEE Internet Initiative Newsletter. IEEE Internet Initiative connects technology experts and policymakers from around the world to foster a better understanding of, and to improve decisions affecting, Internet governance, cybersecurity, and privacy issues. I am serving in the steering committee of International Conference on Evolving Internet. I am a Senior Member of IEEE.

 

 

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My Resume

Education

Osaka University, Osaka, Japan

2005 - 2008

Ph.D. in Information Science and Technology
Dissertation: Design and Performance Evaluation of Small-buffered Optical Packet Switched Networks

Bilkent University, Ankara, Turkey

2002 - 2005

M.S. in Electrical and Electronics Engineering on Computer Networks Area
Thesis: Combined Use of Prioritized AIMD and Flow-Based Traffic Splitting for Robust TCP Load Balancing

COST279 Summer School, Darmstadt, Germany

2003

Summer School organized by European Union

Topic: Routing and Multi-Layer Traffic Engineering in Next Generation IP Networks

Bilkent University, Ankara, Turkey

1998 - 2002

B.S. in Electrical and Electronics Engineering

Work Experience

Osaka University, Osaka, Japan

2008 -

Post-doctoral Researcher

Bilkent University, Ankara, Turkey

2002 - 2005

• Research Assistant
• Teaching Assistant
• Administrator of computer systems of Department of Electrical and Electronics Engineering
• Administrator of Bilkent University Information Networks Laboratory

Academic Awards & Honours

Best Paper Award (First International Conference on Evolving Internet) (2009)

Best Master’s Thesis Award (IEEE Student Branch) (2005)

Best Research and Teaching Assistant Award (Bilkent University) (2004)

Ranked 67th in OYS (National University Entrance Exam) among 1.500.000 students in Turkey (1998)

Ranked 56th in National Science High School Entrance Exam in Turkey (1995)

Scholarships

Monbukagakusho Graduate Scholarship from the Ministry of Education of Japan (2005-2008)

Full M.S. scholarship (Bilkent University) (2002-2005)

Full B.S. scholarship (Bilkent University) (1998-2002)

Memberships

IEEE (Senior Member)

IEICE (Member)

Academic Activities

IEEE Internet Initiative Newsletter (Editor)

International Conference on Evolving Internet (Steering Committee Member)

International Conference on Cloud Computing, GRIDs, and Virtualization (TPC Member)

Photonic Network Communications (Reviewer)

International Journal On Advances in Internet Technology (Reviewer)

Optical Switching and Networking (Reviewer)

Transactions on Emerging Telecommunications Technologies (Reviewer)

Journal of Internet Technology (Reviewer)

Certificates

TOEIC (925 / 990)

Japan Permanent Resident

Languages

Turkish (native)

English (fluent)

Japanese (fluent)

Hobbies

Japanese history, traditions, festivals and folklore

Photography

Other Awards

Certificate of Appreciation and Plaque from Japan Self-Defense Forces (JSDF) for promoting Japanese culture and international exchange

Kyoto Mayor's Award at Kyoto Festival Photo Contest

Grand Prix Award at Kyoto Photo Contest

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Research Topics

My research topics and some selected journal publications are as follows:

 

 

Security and Network Function Visualization (NFV)

One of the key emerging areas in computer networks is Network Function Visualization (NFV). In traditional networks, many network services like firewall, domain name service (DNS) etc. are implemented in dedicated hardware appliances. NFV decouples such functions from proprietary hardware appliances so they can run in software. NFV is expected to reduce capital and operating costs, improve network flexibility, manageability and reduce the time to deploy new networking services. I am working on orchestration and management of virtual network functions and improving their reliability.

 

Neural Networks and Network Resilience

I was involved in Yuragi project of Osaka University, which proposes applying mathematical neural network models derived from biological systems to computer networks. Yuragi models the gene regulatory network of cells as an attractor selection based neural network for controlling VNT (virtual network topology) in optical networks. The attractor VNT candidates are stored in a Hopfield network, which is a kind of recurrent artificial neural network. I designed heuristic algorithms for designing attractor VNTs for Yuragi that are robust against large scale network failures.

 

  1. O. Alparslan, S. Arakawa, and M. Murata, “Designing VNT candidates robust against network failures,” Journal of Internet Technology, in press, 2016.

 

 

Hybrid Optical Path and Packet Switching

I designed a hybrid optical network architecture, which uses both path (circuit) and packet switching. It carries the long TCP flows over path switching wavelengths in order to maximize average the throughput of the flows. It dynamically changes the ratio of path and packet switching wavelengths network-wide according to the traffic characteristics. I implemented a large scale optical packet and path(circuit) switching network simulator for this research. To the best of my knowledge it is currently the fastest and most scalable simulator for packet level simulation of TCP flows on optical networks in the literature. I have simulated mesh optical networks with 80Gbps link speed using around 10^10 TCP flows.

 

  1. O. Alparslan, S. Arakawa, and M. Murata, "Dynamic wavelength allocation and analytical model for flow assignment in optical packet and path integrated networks," IEEE/OSA Journal of Optical Communications and Networking, in press, 2017

 

 

Analytical modelling of circuit switching networks

Using a M∕G∕c∕c Markov chain queuing model I proposed an analytical framework for calculating the path (circuit) blocking probabilities and reservation delays in path switching optical WDM networks. There are numerous analytical models in the literature, but to the best of my knowledge my analysis is the most accurate one in the literature.

 

  1. O. Alparslan, S. Arakawa, and M. Murata, "Computing path blocking probability and delay in optical networks with retrial," Journal of Optical Communications and Networking, vol. 5, no. 5, pp. 498-511, May 2013.

 

Small Buffered Networks

In my Ph.D. thesis I challenged the famous rule of thumb, which states that network routers require a buffer size of Bandwidth*RTT in order to achieve high utilization with TCP flows. I modelled the packet drop rate of different buffer architectures with TCP traffic by analysis and simulation. I proposed novel network architectures, which greatly decrease the buffering requirements of both electronic and optical networks.

 

  1. O. Alparslan, S. Arakawa, and M. Murata, "Node pacing for small optical RAM-buffered packet-switching networks," Photonic Network Communications, vol. 22, no. 2, pp. 172-179, October 2011.
  2. O. Alparslan, S. Arakawa, and M. Murata, "Buffer scaling for optical packet switching networks with shared RAM, "Optical Switching and Networking, vol. 8, no. 1, pp. 12-22, January 2011.
  3. O. Alparslan, S. Arakawa, and M. Murata, "Comparison of packet switch architectures and pacing algorithms for very small optical RAM, "International Journal on Advances in Internet Technology, vol. 3, no. 1&2, pp. 159-169, 2010. (peer reviewed) (Invited Paper)
  4. O. Alparslan, S. Arakawa, and M. Murata, "XCP-based transmission control mechanism for optical packet switched networks with very small optical RAM," Photonic Network Communications, vol. 18, no. 2, pp. 237-243, October 2009. (peer reviewed)
  5. O. Alparslan, S. Arakawa, and M. Murata, "Rate-based pacing for small buffered optical packet-switched networks," Journal of Optical Networking, vol. 6, no. 9, pp. 1116-1128, September 2007.

 

Optical Burst Switching (OBS)

We studied the effects of the number of justifiers on TCP performance in an optical burst switching (OBS) network. Our simulations show that increasing the number of assemblers per destination reduces the negative effects of synchronization between TCP flows occurring as a result of burst losses. I designed and implemented an advanced optical burst network simulator for this project and released its source code on the Internet available here. Some independent survey papers selected my simulator as the most advanced OBS simulator among all related free and commercial simulators.

 

  1. G. Gurel, O. Alparslan, and E. Karasan, "nOBS: an ns2 based simulation tool for performance evaluation of TCP traffic in OBS networks," Annals of Telecommunications, vol. 62, no. 5-6, pp. 618-632, May-June 2007. (peer reviewed)

 

 

Multi-path Traffic Engineering with QoS for MPLS networks

I proposed a QoS based network architecture for electronic networks using TCP load balancing traffic engineering methodology and a random early rerouting algorithm that controls the queuing delay difference between the two alternative paths. I showed that avoiding packet reordering by flow level splitting significantly improves the network performance.
My M.S. Thesis on this project won the Best M.S. Thesis Award of Electrical and Electronics Department of Bilkent University.

 

  1. O. Alparslan, N. Akar, and E. Karasan, "TCP flow aware adaptive path switching in diffserv enabled MPLS networks," European Transactions on Telecommunications, vol. 22, no. 5, pp. 185-199, August 2011.
  2. O. Alparslan, N. Akar, and E. Karasan, "AIMD-based online MPLS traffic engineering for TCP flows via distributed multi-path routing," Annals of Telecommunications, vol. 59, no. 11-12, pp. 1353-1371, Nov-Dec 2004.

Copyright © 2016 All right reserved

Publications

Journal Papers

  1. O. Alparslan, S. Arakawa, and M. Murata, "Dynamic wavelength allocation and analytical model for flow assignment in optical packet and path integrated networks," IEEE/OSA Journal of Optical Communications and Networking, in press, 2017

  2. O. Alparslan, S. Arakawa, and M. Murata, "Designing VNT candidates robust against network failures," Journal of Internet Technology, in press, 2016

  3. O. Alparslan, S. Arakawa, and M. Murata, "Computing path blocking probability and delay in optical networks with retrial," Journal of Optical Communications and Networking, vol. 5, no. 5, pp. 498-511, May 2013. [pdf]

  4. O. Alparslan, S. Arakawa, and M. Murata, "Node pacing for small optical RAM-buffered packet-switching networks," Photonic Network Communications, vol. 22, no. 2, pp. 172-179, October 2011. [pdf]

  5. O. Alparslan, N. Akar, and E. Karasan, "TCP flow aware adaptive path switching in diffserv enabled MPLS networks," European Transactions on Telecommunications, vol. 22, no. 5, pp. 185-199, August 2011. [pdf]

  6. O. Alparslan, S. Arakawa, and M. Murata, "Buffer scaling for optical packet switching networks with shared RAM, "Optical Switching and Networking, vol. 8, no. 1, pp. 12-22, January 2011. [pdf]

  7. O. Alparslan, S. Arakawa, and M. Murata, "Comparison of packet switch architectures and pacing algorithms for very small optical RAM," International Journal on Advances in Internet Technology, vol. 3, no. 1&2, pp. 159-169, 2010. (Invited Paper) [pdf]

  8. O. Alparslan, S. Arakawa, and M. Murata, "XCP-based transmission control mechanism for optical packet switched networks with very small optical RAM," Photonic Network Communications, vol. 18, no. 2, pp. 237-243, October 2009. [pdf]

  9. O. Alparslan, S. Arakawa, and M. Murata, "Rate-based pacing for small buffered optical packet-switched networks," Journal of Optical Networking, vol. 6, no. 9, pp. 1116-1128, September 2007. [pdf]

  10. G. Gurel, O. Alparslan, and E. Karasan, "nOBS: an ns2 based simulation tool for performance evaluation of TCP traffic in OBS networks," Annals of Telecommunications, vol. 62, no. 5-6, pp. 618-632, May-June 2007. [pdf]

  11. O. Alparslan, N. Akar, and E. Karasan, "AIMD-based online MPLS traffic engineering for TCP flows via distributed multi-path routing," Annals of Telecommunications, vol. 59, no. 11-12, pp. 1353-1371, Nov-Dec 2004. [pdf]
  12.  

     

    International Conference and Workshop Papers

  13. O. Alparslan, S. Arakawa, and M. Murata, “Designing VNT candidates robust against congestion due to node failures,” in Proceedings of IEEE International Conference on High Performance Switching and Routing (HPSR), June 2016.

  14. O. Alparslan, S. Arakawa, and M. Murata, “Computing flow completion time in optical path/packet integrated networks,” in Proceedings of International Conference on Photonics in Switching (OECC/PS 2013), (Kyoto), June 2013.

  15. O. Alparslan, S. Arakawa, and M. Murata, “Computing path blocking probabilities for traffic splitting in optical hybrid switching networks,” in Proceedings of IEEE International Conference on Communications (ICC), June 2012, pp. 2983-2988.

  16. O. Alparslan, S. Arakawa, and M. Murata, "Packet switch architectures for very small optical RAM," in Proceedings of The First International Conference on Evolving Internet (INTERNET 2009), August 2009, pp. 106-112. (Best Paper Award)

  17. O. Alparslan, S. Arakawa, and M. Murata, "Node pacing for optical packet switching," in Proceedings of Photonics in Switching, August 2008

  18. O. Alparslan, S. Arakawa, and M. Murata, "Rate-based pacing for optical packet switched networks with very small optical RAM," in Proceedings of IEEE Broadnets, September 2007.

  19. O. Alparslan, S. Arakawa, and M. Murata, "Switch architectures for small-buffered optical packet switched networks," in Proceedings of 12th IEEE Symposium on Computers and Communications (ISCC'07), July 2007.

  20. O. Alparslan, S. Arakawa, and M. Murata, "Performance of paced and non-paced transmission control algorithms in small buffered networks," in Proceedings of the 11th IEEE Symposium on Computers and Communications (ISCC'06), June 2006, pp. 115-122.

  21. O. Alparslan, S. Arakawa, and M. Murata, "Optical rate-based paced XCP for small buffered optical packet switching networks," in Proceedings of PFLDnet, February 2006, pp. 117-124.

  22. G. Gurel, O. Alparslan, and E. Karasan, "nOBS: ns2 based simulation tool for TCP performance evaluation in OBS networks," in Proceedings of European Symposium on Simulation Tools for Research and Education in Optical Networks, October 2005.

  23. O. Alparslan, N. Akar, and E. Karasan, "Combined use of prioritized AIMD and flow-based traffic splitting for robust TCP load balancing," Fifth International Workshop on Quality of future Internet Services (QofIS'04), Lecture Notes in Computer Science, vol. 3266, pp. 124-133, September, 2004.
  24.  

     

    Domestic Workshop

  25. O. Alparslan, S. Arakawa, and M. Murata, “Recovery from multiple node failures by virtual network topology control based on attractor selection,” IEICE (PN2014-79), pp.11-15, March 2015.

  26. O. Alparslan, S. Arakawa, and M. Murata, “Dynamic optimization of wavelength ratio in hybrid optical networks,” IEICE (PN2014-5), pp.25-30, June 2014.

  27. O. Alparslan, S. Arakawa, and M. Murata, "Performance analysis of optical path/packet integrated networks," IEICE (PN2012-23), vol. 112, pp. 53-58, August 2012.

  28. O. Alparslan, S. Arakawa, and M. Murata, "Analysis of path switching performance metrics for optical hybrid switching networks," IEICE (PN2011-11), pp. 39-43, November 2011.

  29. O. Alparslan, S. Arakawa, and M. Murata, "Packet switch architectures for very small optical RAM," IEICE (PN2008-63), pp. 119-124, January 2009.

  30. O. Alparslan, S. Arakawa, and M. Murata, "Node pacing for optical packet switching," IEICE (PN2007-76), pp. 17-20, March 2008.

  31. O. Alparslan, S. Arakawa, and M. Murata, "A comparative study of switch architectures for small-buffered optical packet switched networks," IEICE (OPE2006-159), pp. 167-172, January 2007.

  32. O. Alparslan, S. Arakawa, and M. Murata, "Rate-based paced XCP for small buffered optical packet switched networks," IEICE (PN2006-7), pp. 35-40, May 2006.

Copyright © 2016 All right reserved

My Software

[Simulator]

• nOBS v2.0 (updated on August 10, 2016)

The source code of OBS (optical burst switching) extension that I implemented for ns-2 simulator is here. The new version is updated for ns2.35. It was presented and used in "nOBS: an ns2 based simulation tool for performance evaluation of TCP traffic in OBS networks" journal paper available here.

• Multipath Routing for ns-2

The ns-2 simulator module and simulation scripts that I implemented for the simulations in the paper "Combined use of prioritized AIMD and flow-based traffic splitting for robust TCP load balancing," are here. The paper is here.

 

[Security]

• Differential Cryptanalysis

The source code and executables of the encoder and the differential cryptanalysis key finder programs that I implemented for the MacGuffin block cipher algorithm are here. The encoder program creates 100000 random cyphertext plaintext pairs by encrypting with 8-block MacGuffin cipher algorithm with 128-bit input key and the findkey program calculates the secret subkeys of the encrypted ciphertexts by differential cryptanalysis.


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Contact Info

Address :

Advanced Network Architecture Laboratory,
Graduate School of Information Science and Technology,

Osaka University,

1-5 Yamadaoka, Suita,

Osaka 565-0871, Japan

 

E-mail :

a-onurist.osaka-u.ac.jp

 

 

Copyright © 2016 All right reserved