PUBLICATIONS

For IEEE Publications:

 

© 2025 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.

 

EDITED BOOKS

1.    Nail Akar, Michal Pioro, Charalabos Skianis (Eds.), LNCS 5275, 8th IEEE International Workshop, IPOM 2008, Samos Island, Greece, September 2008 Proceedings.

2.    Jose Brazio, Phuoc Tran-Gia, Nail Akar, Andrzej Beben, Wojciech Burakowski, Markus Fiedler, Ezhan Karasan, Michael Menth, Philippe Olivier, Kurt Tutschku, Sabine Wittevrongel (Eds.), COST-279 Final Report - Analysis and Design of Advanced Multiservice Networks Supporting Mobility, Multimedia, and Internetworking, Springer, 2005.

 

BOOK CHAPTERS

1.    E. Ayanoglu and N. Akar, BISDN (Broadband Integrated Services Digital Network), Wiley Encyclopedia on Telecommunications, January 2003.

 

JOURNAL PUBLICATIONS

1.     Ege Orkun Gamgam, Nail Akar and Sennur Ulukus, “Minimizing Age of Information and Its Peak: Finding Cyclic Schedules with Deletion Search, accepted, IEEE Transactions on Communications, 2025.

2.    U. Erdem, E. Karasan, N. Akar, “Channel access in multi-rate wireless LANs: a peak age of information perspective,” in Wireless Networks, vol. 31, pp. 4163–4177, 2025.

3.    I. Cosandal, N. Akar, S. Ulukus, “Multi-Threshold AoII-Optimum Sampling Policies for CTMC Information Sources", in IEEE Trans. Inf. Theory, vol. 71, no. 9, pp. 6968-6988, Sep. 2025.

4.    H. Zeng, Y. Qu, Z. Chen , N. Akar, M. Wang , D. O. Wu , T. Q. S. Quek , "Age of Information Analysis of Ber/Geo/1/1 Queue With On-Off Service," in IEEE Internet of Things Journal, vol. 12, no. 14, pp. 26607-26619, 2025.

5.    Sahan Liyanaarachchi, Sennur Ulukus, and Nail Akar, “Cyclic Scheduler Design for Minimizing Age of Information in Massive Scale Networks Susceptible to Packet Errors,” to appear in IEEE Transactions on Information Theory, 2025.

6.    Sahan Liyanaarachchi, Sennur Ulukus, and Nail Akar, “Scheduling Policies in a Multi-Source Status Update System with Dedicated and Shared Servers”, in IEEE Internet of Things Journal, vol. 12, no. 13, pp. 22772-22785, 2025.

7.    Nail Akar and Sennur Ulukus, “Age of Information in a Single-Source Generate-at-Will Dual-Server Status Update System,” to appear in IEEE Transactions on Communications, 2025.

8.    Omer Gursoy and Nail Akar, "Adaptive Frame Coalescing in Energy Efficient Ethernet with Model Predictive Control and Queuing Theory," IEEE Transactions on Green Communications and Networking, vol. 8, no. 4, pp. 1574-1585, Dec. 2024.

9.    Nail Akar and Sennur Ulukus, "Query-Based Sampling of Heterogeneous CTMCs: Modeling and Optimization with Binary Freshness," IEEE Transactions on Communications, vol. 72, no. 12, pp. 7705-7714, Dec. 2024.

10. Ege Orkun Gamgam and Nail Akar, "Water-Filling-Based Scheduling for Weighted Binary Freshness in Cache Update Systems," IEEE Internet of Things Journal, vol. 11, no. 5, pp. 8961-8972, March 2024.

11. Nail Akar and Ege Orkun Gamgam, “Distribution of Age of Information in Status Update Systems with Heterogeneous Information Sources: An Absorbing Markov Chain-based Approach”, IEEE Communications Letters, vol. 27, no. 8, pp. 2024-2028, 2023.

12. Kaveh Vaezi, Nail Akar, and Ezhan Karasan, “Modeling Age of Information in a Cooperative Slotted Aloha Network”, Wireless Networks, vol. 29, pp. 2405–2417, 2023.

13. Nail Akar and Ezhan Karasan, “Is Proportional Fair Scheduling Suitable for Age-Sensitive Traffic?”, Computer Networks, 109668, vol. 226, May 2023.

14. Ege Orkun Gamgam and Nail Akar, “Exact Analytical Model of Age of Information in Multi-source Status Update Systems with Per-Source Queueing”,  IEEE Internet of Things Journal, vol. 9, no. 20, pp. 20706-20718, 2022.

15. Ozancan Dogan and Nail Akar, “The Multi-Source Probabilistically Preemptive M/PH/1/1 Queue with Packet Errors”, IEEE Transactions on Communications, vol. 69, no. 11, pp. 7297-7308, Nov. 2021, doi: 10.1109/TCOMM.2021.3106347.

16. Abdul Kerim Aydin and Nail Akar, "Energy Management for Age of Information Control in Solar-powered IoT End Devices", Wireless Networks, vol. 27, pp. 3165–3178, 2021.

17. Eray Erturk, Ozlem Yildiz, Shahram Shahsavari, and Nail Akar, “Power Allocation and Temporal Fair User Group Scheduling for Downlink NOMA”, Telecommunication Systems, vol. 77, pp. 753–766, 2021.

18. Omer Gursoy, Kamal Adli Mehr, and Nail Akar, "Steady-state and first passage time distributions for waiting times in the MAP/M/s+G Queueing model with generally distributed patience times," Journal of Industrial Management and Optimization, doi: 10.3934/jimo.2021078, 2021.

19. N. Akar and O. Dogan, Discrete-time Queueing Model of Age of Information with Multiple Information Sources”, in IEEE Internet of Things Journal, vol. 8, no. 19, pp. 14531-14542, 1 Oct.1, 2021, doi: 10.1109/JIOT.2021.3053768.

20. Akar, N., Gursoy, O., Horvath, G., Telek, M., “Transient and First Passage Time Distributions of First- and Second-order Multi-regime Markov Fluid Queues via ME-fication”, Methodology and Computing in Applied Probability (Springer) https://doi.org/10.1007/s11009-020-09812-y  (2020).

21. N. Akar, O. Dogan and E. U. Atay, “Finding the Exact Distribution of (Peak) Age of Information for Queues of PH/PH/1/1 and M/PH/1/2 Type”,  in IEEE Transactions on Communications, vol. 68, no. 9, pp. 5661-5672, Sept. 2020, doi: 10.1109/TCOMM.2020.3002994.

22. E. O.  Gamgam, C. Tunc, N. Akar, “On the Queuing Model of the Energy-Delay Trade-off in Wireless Links with Power Control and Link Adaptation”,  IEEE Transactions on Communications, vol. 67, no. 5, pp. 3431-3442, May 2019, doi: 10.1109/TCOMM.2019.2897700.

23. K. A. Mehr, J. M. Niya, N. Akar, “Queue Management for Two-User Cognitive Radio with Delay-Constrained Primary User”, Computer Networks, vol. 142, pp. 1-12, 2018.

24. S. Shahsavari, N. Akar, B. H. Khalaj, “Joint Cell Muting and User Scheduling in Multi-Cell Networks with Temporal Fairness,” Wireless Communications and Mobile Computing, vol. 2018, Article ID 4846291

25. M. A. Yazici, N. Akar, “Performance Modeling of QoS Differentiation in Optical Packet Switching via FDL Access Limitation”, Photonic Network Communications, Volume 34, Issue 3, pp 344–355, Dec. 2017.

26. C. Tunc, N. Akar, “Markov Fluid Queue Model of an Energy Harvesting IoT Device with Adaptive Sensing”, Performance Evaluation,” Volume 111, Issue C, pp. 1-16, May 2017.

27. N. Akar, C. Tunc,  M. Gaertner, M. F. Erden, “Disk scheduling with shortest cumulative access time first algorithms,” Turk J Elec Eng & Comp Sci,  25: 3367 – 3380, 2017.

28. A. Yazici and N. Akar, “The Finite/Infinite Horizon Ruin Problem with Multi-threshold Premiums: A Markov Fluid Queue Approach,” Annals of Operations Research, Vol. 252, Issue 1, pp. 85-99, May 2017.

29. C. Tunc and N. Akar, “Fixed-point Analysis of a Network of Routers with Persistent TCP/UDP  Flows and Class-based Weighted Fair Queuing", Telecommunication Systems, Volume 64, Issue 4, pp. 585-598, April 2017.

30. O. Ozturk and N. Akar, “A novel queue-aware wireless link adaptation mechanism and its fixed-point analytical model,” EURASIP Journal on Wireless Communications and Networking, 2015, 2015:248 

31. K. Vaezi and N. Akar, “Analytical performance modeling of elastic optical links with aligned spectrum allocation,” Computer Networks, Vol. 88, pp.  40–50, September 2015.

32. S. Shahsavari and N. Akar, “A Two-Level Temporal Fair Scheduler for  Multi-cell Wireless Networks,” IEEE Wireless Communicatiosn Letters, vol.4, no.3, pp.269-272, June 2015.

33. N. Akar, “Fitting Matrix Geometric Distributions by Model Reduction,”  Stochastic Models, Vol. 31, Iss. 2, 2015.

34. C. Tunc, N. Akar, “Mapping Time-Varying IP Traffic to Flexible Optical Paths in Flexgrid Optical Networks", Photonic Network Communications, vol. 29, no. 1, pp: 67-77, 2015.

35. R. Yumer, N. Akar, E. Karasan, “Class-based first-fit spectrum allocation with fragmentation avoidance for dynamic flexgrid optical networks”, Optical Switching and Networking, vol. 15, pp. 44-52, January 2015.

36. O. Öztürk and N. Akar, “Workload-dependent queuing model of an AQM-controlled wireless router with TCP traffic and its application to PER-based link adaptation”, EURASIP Journal on Wireless Communications and Networking, 2014-67, 2014.

37. A. Yazıcı and N. Akar, “Running Multiple Instances of the Distributed Coordination Function for Air-time Fairness in Multi-Rate WLANs”, IEEE Transactions on Communications, vol.61, no.12, pp. 5067-5076, December 2013.

38. N. Akar and Y. Gunalay, “Dimensioning Shared-per-Node Recirculating Fiber Delay Line Buffers in an Optical Packet Switch”, Performance Evaluation, Volume 70, Issue 12, pp. 1059-1071, December 2013.

39. A. Yazıcı and N. Akar, “The Workload-dependent MAP/PH/1 Queue with Infinite/Finite Workload Capacity”, Performance Evaluation, Volume 70, Issue 12, pp. 1047-1058, December 2013 .

40. N. Akar, “Delay Analysis of Timer-Based Frame Coalescing in Energy Efficient Ethernet”, IEEE Communications Letters, vol. 17, no. 7, pp. 1459-1462, July 2013.

41. N. Akar, C. Raffaelli, M. Savi, “State Aggregation-based Model of Asynchronous Multi-Fiber Optical Switching with Shared Wavelength Converters”, Optical Switching and Networking, vol. 10, no. 3, pp. 173-185,  2013.

42. N. Akar , "Moments of Conditional Sojourn Times in Finite Capacity M/M/1/N-PS Processor Sharing Queues,"  IEEE Communications Letters, vol.16, no.4, pp.533-535, April 2012.

43. N. Akar and K. Sohraby, Retrial Queuing Models of Multi-wavelength FDL Feedback Optical Buffers, IEEE Transactions on Communications, vol. 59, no. 10,  pp. 2832—2840, Oct. 2011.

44. N. Akar, V. Eramo, and C. Raffaelli, “Comparative Analysis of Power Consumption in Asynchronous Wavelength-Modular Optical Switching“, Optical Switching and Networking, vol. 8, no. 3, pp. 139-148, July 2011.

45. O. Alparslan, N. Akar and E. Karasan, “TCP Flow Aware Adaptive Path Switching in Diffserv Enabled MPLS Networks,” European Transactions on Telecommunications (now named Transactions on Emerging Telecommunications Technologies), vol. 22, no. 5, pp. 185-199, August 2011.

46. N. Akar and M. A. Toksoz, “MPLS Automatic Bandwidth Allocation via Adaptive Hysteresis”, Computer Networks, vol. 55, no. 5, pp. 1181-1196, April 2011.

47. M. A. Toksoz and N. Akar, “Dynamic Threshold-based Assembly Algorithms for Optical Burst Switching Networks Subject to Burst Rate Constraints,” Photonic Network Communications, vol. 20, no. 2, pp. 120-130, Oct. 2010. 

48. N. Akar, C. Raffaelli, M. Savi, and E. Karasan,  “Shared-Per-Wavelength Asynchronous Optical Packet Switching: A Comparative Analysis“, Computer Networks, vol. 54, no. 13, pp. 2166-2181, Sep. 2010.

49. N. Akar, E. Karasan, K. G. Vlachos, M. Varvarigos, D. Careglio, M. Klinkowski, J. Solé-Pareta, “A Survey of Quality of Service Differentiation Mechanisms for Optical Burst Switching Networks”, Optical Switching and Networking, vol. 7, no. 1, pp. 1-10, January 2010.

50. E. Kankaya,  N. Akar, “Exact Analysis of Single-Wavelength Optical Buffers with Feedback Markov Fluid Queues”, IEEE/OSA Journal of Optical Communications and Networking, vol.1, no.6, pp.530-542, November 2009.

51. N. Akar, K. Sohraby, “System-theoretical Algorithmic Solution to Waiting Times in Semi-Markov Queues”, Performance Evaluation, vol. 66, no. 11, pp. 587-606, November 2009.

52. N. Akar , E. Karasan, and C. Raffaelli, “Fixed Point Analysis of Limited Range Share Per Node Wavelength Conversion in Asynchronous Optical Packet Switching Systems”, Photonic Network Communications, Volume 18, Number 2, pp. 255-263,  October, 2009.

53. O. Ozturk, E. Karasan, and N. Akar, “Performance Evaluation of Slotted Optical Burst Switching Systems with Quality of Service Differentiation”, IEEE/OSA Journal of Lightwave Technology, vol. 27, no. 14, pp. 2621-2633, July  2009.

54. H. E. Kankaya and N. Akar, “Exact Analysis of Offset-based Service Differentiation in Single-channel Multi-class OBS”, IEEE Communications Letters, vol.13, no.2, pp.148-150, February 2009.

55. H. E. Kankaya and N. Akar,  “Solving Multi-Regime Feedback Fluid Queues”, Stochastic Models, vol. 24, issue. 3, pp. 425-450, 2008.

56. J. Aracil, N. Akar, S. Bjornstad, M. Casoni, K. Christodoulopoulos, D. Careglio, J. Fdez-Palacios, C. Gauger, O. Gonzalez de Dios, G. Hu, E. Karasan, M. Klinkowski, D. Morato, R. Nejabati, H. Overby, C. Raffaelli, D. Simeonidou, N. Stol, G. Tosi-Beleffi and K. Vlachos, “Research in Optical Burst Switching within the e-Photon/ONe Network of Excellence”, Optical Switching and Networking, vol. 4, no. 1, pp. 1-19, Feb. 2007.  

57. N. Akar and Y. Günalay, “Stochastic analysis of finite population bufferless multiplexing in optical packet/burst switching  systems”, IEICE Trans. Commun., vol. 90-B(2), pp. 342-345, 2007. 

58. K. Dogan, Y. Günalay, and N. Akar, “Comparative study of limited range wavelength conversion policies for asynchronous optical packet switching”, Journal of Optical Networking (Optical Society of America), vol. 6, no. 2, pp. 134-145, 2007.

59. N. Akar, E. Karaşan , and K. Doğan, “Wavelength converter sharing in asynchronous optical packet/burst switching: An exact blocking analysis for Markovian arrivals”, IEEE Journal on Selected Areas in Communications, vol. 14, no.12, 69-80, 2006.

60. N. Akar, “Solving the ME/ME/1 queue with state-space methods and the matrix sign function”, Performance  Evaluation, vol. 63, no. 2, pp. 131-145, Feb. 2006. 

61. H. Boyraz and N. Akar , “Rate-controlled optical burst switching for both congestion avoidance and service differentiation”,  Optical Switching and Networking, vol. 2, no.4, pp. 217-229, 2005.

62. T. Dayar and N. Akar, “Computing moments of first passage times to a subset of states in Markov chains”, SIAM Journal on Matrix Analysis and Applications, vol. 27, no. 2, 2005.

63. E. Gurses, G. Bozdagi Akar, and N. Akar, "A Simple and Effective Mechanism for Stored Video Streaming with TCP Transport and Server-Side Adaptive Frame Discard", Computer Networks, vol. 48, no. 4, pp. 489-501, July 2005. 

64. T. P.R. Nyirenda-Jere, V. Frost, and N. Akar, "Capacity Requirements of Traffic Handling Schemes in Multi-Service Networks", Computer Communications, Vol. 28, pp. 2070-2081, 2005. 

65. O. Alparslan, N. Akar and E. Karasan, "AIMD-Based Online MPLS Traffic Engineering for TCP Flows via Distributed Multi-Path Routing", Annales Des Telecommunications (Annals of Telecommunications), Nov-Dec 2004.

66. N. Akar, I. Hokelek, and E. Karasan, "Available Bit Rate Traffic Engineering in MPLS Networks with Flow-Based Multipath Routing", IEICE Transactions Communications, vol. E87-B, no.10, pp. 2913--2921, October 2004. 

67. N. Akar and K. Sohraby, "Infinite/Finite Buffer Markov Fluid Queues: A Unified Analysis", Journal of Applied Probability, Vol. 41, No. 2, pp. 557-569, June 2004. 

68. E. Karasan, O. Ekin-Karasan, N. Akar, and M. Pinar, "Mesh Topology Design in Overlay Virtual Private Networks", IEE Electronics Letters, August 2002.

69. N. Akar, N. C. Oguz, and K. Sohraby, “A Novel Computational Method for Solving Finite QBD Processes”, Stochastic Models, 2000.

70. N. Akar, N. C. Oguz, and K. Sohraby, “TELPACK: An Advanced Teletraffic Analysis Package”, IEEE Communications Magazine, August 1998.

71. N. Akar, N. C. Oguz, and K. Sohraby, “Matrix-geometric Solutions of M/G/1 Type Markov Chains: A Unifying Generalized State-Space Approach”, IEEE Journal on Selected Areas in Communications, Vol. 16, 1998.

72. N. Akar and K. Sohraby, “An Invariant Subspace Approach in M/G/1 and G/M/1 type Markov Chains”, Comm. Statist. Stochastic Models, vol. 13, no. 3, 1997.

73. N. Akar and E. Arikan, “A Numerically Efficient Method for the MAP/D/1/K Queue via Rational Approximations”, Queueing Systems: Theory and Applications, 1996.

74. N. Akar and E. Arikan, “Markov Modulated Periodic Arrival Process Offered to an ATM Multiplexer”, Performance Evaluation, Vol. 22, p. 175-190, 1995.

75. A.B. Ozgüler and N. Akar, “A Common Solution to a Pair of Linear Matrix Equations over a Principal Ideal Domain”, Linear Algebra and Its Applications, Vol. 144, p. 85-99, 1991.

 

REFEREED CONFERENCES

1.      Mustafa Doger, Sennur Ulukus, and Nail Akar, “Double Spending Analysis of Nakamoto Consensus for Time-Varying Mining Rates with Ruin Theory”, IEEE International Conference on Blockchain and Cryptocurrency (ICBC), 2025.

2.      I. Cosandal, S. Ulukus, and N. Akar, “Joint Age-State Belief is All You Need: Minimizing AoII via Pull-Based Remote Estimation”, IEEE ICC Workshop on Task-Oriented and Generative Communications for 6G (TOGC6G), 2025.

3.      I. Cosandal, S. Ulukus, and N. Akar, “Which Sensor to Observe? Timely Tracking of a Joint Markov Source with Model Predictive Control”, IEEE International Symposium on Information Theory (ISIT), 2025.

4.      Shubham Aggarwal, Melih Bastopcu, Muhammad Aneeq uz Zaman, Tamer Başar, Sennur Ulukus, and Nail Akar, “Decentralized Computation Offloading in Priority-Driven Edge Computing Systems, IEEE INFOCOM Age and Semantics of Information Workshop (ASoI), 2025.

5.     Mustafa Doger, Sennur Ulukus, and Nail Akar, “PoW Security-Latency under Random Delays and the Effect of Transaction Fees”, IEEE Information Theory Workshop, Shenzhen, China, Nov. 2024.

6.     Nail Akar, Melih Bastopcu, Sennur Ulukus, and Tamer Başar, “Modeling Interfering Sources in Shared Queues for Timely Computations in Edge Computing Systems”, MOBIHOC '24: Proceedings of the Twenty-fifth International Symposium on Theory, Algorithmic Foundations, and Protocol Design for Mobile Networks and Mobile Computing, Athens, Greece, Oct. 2024.

7.     S. Liyanaarachchi, S. Ulukus and N. Akar, "Hybrid Status Update Systems with Dedicated and Shared Servers," 2024 22nd International Symposium on Modeling and Optimization in Mobile, Ad Hoc, and Wireless Networks (WiOpt), Seoul, Korea, Republic of, 2024, pp. 22-29.

8.     S. Liyanaarachchi, S. Ulukus, and N. Akar, “Minimizing the Age of Two Heterogeneous Sources With Packet Drops Via Cyclic Schedulers”, Asilomar Conference on Signals, Systems, and Computers, October 2024.

9.     N. Akar and S. Ulukus, "Controlling Age of Information in a Dual-Server System with Transmission Freezing and Preemption," 2024 IEEE 25th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC), Lucca, Italy, 2024, pp. 801-805, doi: 10.1109/SPAWC60668.2024.10694368.

10.  I. Cosandal, N. Akar and S. Ulukus, "AoII-Optimum Sampling of CTMC Information Sources Under Sampling Rate Constraints," IEEE International Symposium on Information Theory (ISIT), Athens, Greece, 2024, pp. 1391-1396, doi: 10.1109/ISIT57864.2024.10619293.

11.  N. Akar and S. Ulukus, "Timely Monitoring of Markov Chains Under Sampling Rate Constraints," ICC 2024 - IEEE International Conference on Communications, Denver, CO, USA, 2024, pp. 189-194, doi: 10.1109/ICC51166.2024.10622215.

12.  I. Cosandal, N. Akar and S. Ulukus, "Modeling AoII in Push- and Pull-Based Sampling of Continuous Time Markov Chains," IEEE INFOCOM 2024 - IEEE Conference on Computer Communications Workshops (INFOCOM WKSHPS), Vancouver, BC, Canada, 2024 (presented by Nail Akar)

13.  N. Akar, S. Liyanaarachchi and S. Ulukus, "Scalable Cyclic Schedulers for Age of Information Optimization in Large-Scale Status Update Systems," IEEE INFOCOM 2024 - IEEE Conference on Computer Communications Workshops (INFOCOM WKSHPS), Vancouver, BC, Canada, 2024

14.  E.O.Gamgam, N. Akar and S. Ulukus, "Cyclic Scheduling for Age of Information Minimization with Generate at Will Status Updates," 2024 58th Annual Conference on Information Sciences and Systems (CISS), Princeton, NJ, USA, 2024, pp. 1-6, doi: 10.1109/CISS59072.2024.10480158.

15.  Nail Akar, “Waiting Times in BMAP/BMSP/1 Queues”, The Ninth International Conference on Matrix-Analytic Methods in Stochastic Models, Budapest, June 28 - 30, 2016.

16.  Caglar Tunc and Nail Akar, “Performance Modeling of Delay-based Dynamic Speed Scaling”, The Ninth International Conference on Matrix-Analytic Methods in Stochastic Models, Budapest, June 28 - 30, 2016.

17.  Onur Öztürk and Nail Akar, “Analysis of an Adaptive Modulation and Coding scheme with HARQ for TCP traffic”, Wireless Telecommunications Symposium, 2015.

18.  Mehmet Akif Yazıcı and Nail Akar, “Analysis of continuous feedback Markov fluid queues and its applications to modeling Optical Burst Switching”,  Proceedings of the 2013 25th International Teletraffic Congress (ITC), Shanghai, China.

19.  N. Akar, C. Raffaelli, and M. Savi, “Analytical Model of Asynchronous Shared-per-Wavelength Multi-fiber Optical Switch“, IEEE Conference on High Performance Switching and Routing (HPSR) 2011.

20.  M. Cenk. Ertürk and N. Akar, “rtPS Uplink Scheduling Algorithms for IEEE 802.16 Networks, ” in the Proceedings of 8th International Symposium on Computer Networks, ISCN’08, Istanbul, 2008.

21.  N. Akar, “Model-free Adaptive Hysteresis for Dynamic Bandwidth Reservation, in the Proceedings of 15th Annual Meeting of the IEEE / ACM International Symposium on Modeling, Analysis, and Simulation of Computer and Telecommunication Systems (MASCOTS) , Istanbul, Turkey, October 24-26, 2007

22.  N. Akar, E.  Karasan, G. Muretto,  Carla Raffaelli, “Performance Analysis of an Optical Packet Switch Employing Full/Limited Range Share Per Node Wavelength Conversion,” in the Proceedings of IEEE Globecom 2007, Washington DC, USA, November 2007.

23.  N. Akar, M. Barbera, L. Budzisz, R. Ferrús, H. Emre Kankaya and G. Schembra, A Performance Evaluation Framework of A Rate-Controlled MPEG Video Transmission over UMTS Networks, in the Proceedings of Second Workshop on multiMedia Applications over Wireless Networks (MediaWiN 2007), Aveiro, Portugal, July 1 2007.

24.  C. Raffaelli, M. Savi, N. Akar, E. Karasan, Packet Loss Analysis of Synchronous Buffer-less Optical Switch with Shared Limited Range Wavelength Converters, in the Proceedings of 2007 International Conference on High Performance Switching and Routing (HPSR 2007), New York, USA, June 2007.

25.  E. Gurses, G. B. Akar, N. Akar, Optimal packet scheduling and rate control for video streaming, SPIE Visual Communications and Image Processing, San Jose, California, 2007. 

26.  N. Akar, A Matrix Analytical Method for the Discrete Time Lindley Equation using the Generalized Schur Decomposition, Workshop on tools for solving structured Markov chains (SMCTOOLS), Pisa, Italy, Oct. 2006.

27.  N. Akar, K. Sohraby, Solving the Single Server Semi-Markov Queue with Matrix Exponential Kernel Matrices for Interarrivals and Services, in the proceedings of First International Conference on Performance Evaluation Methodologies and Tools (VALUETOOLS), Pisa, Italy, Oct. 2006.

28.  K. Dogan and N. Akar, A Performance Study of Limited Range Partial Wavelength Conversion for Asynchronous Optical Packet/Burst Switching, ICC 2006, Istanbul, Turkey, 2006. 

29.  N. Akar and H. Boyraz, Differentiated ABR: A New Architecture for Flow Control and Service Differentiation in Optical Burst Switched Networks, Proceedings of ONDM (Optical Network Design and Modeling) Conference,  Milano, Italy, February 2005.

30.  N. Akar and E. Karasan, Exact Calculation of Blocking Probabilities for Bufferless Optical Burst Switched Links with Partial Wavelength Conversion, 1st International Conference on Broadband Networks - BroadNets 2004, San Jose, USA, 2004. 

31.  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), Barcelona - Spain, 2004.

32.  N. Akar, I. Hokelek, M. Atik, and E. Karasan, A Reordering-free Multipath Traffic Engineering Architecture for Diffserv-MPLS Networks, IEEE Workshop on IP Operations and Management, Kansas City, Missouri, USA, October 1-3, 2003.

33.  N. Akar and K. Sohraby, Algorithmic Solution of Finite Markov Fluid Queues, International Teletraffic Congress, Berlin, Germany, Sep. 2003.

34.  N. Akar and C. Sahin, Dynamic Capacity Provisioning in Virtual Path-Based Networks Using Reinforcement Learning, International Teletraffic Congress (ISCC), Berlin, Germany, Sep. 2003.

35.  N. Akar and C. Sahin, Dynamic Capacity Management for Voice over Packet Networks, International Symposium on Computers and Communications (ISCC), Antalya, Turkey, July 2003.

36.  E. Sengul , B. Can, N. Akar, Y. Z. Ider and H. Koymen, Capacity Analysis of a PMR System with DAB Downlink, International Symposium on Computers and Communications (ISCC), Antalya, Turkey, July 2003.

37.  E. Gurses, N. Akar, and G. B. Akar, Selective Frame Discarding for Video Streaming in TCP/IP Networks, Packet Video Workshop, Nantes, April 28-29, 2003.

38.  E. Gurses, N. Akar, and G. B. Akar, A Novel Architecture for Layered Video Streaming in TCP/IP Networks, COST276 Information and Knowledge Management for Integrated Media Communication  Workshop, Bordeaux, March 31-April 1, 2003.

39.  N. Akar and C. Sahin, Reinforcement Learning as a Means of Aggregate QoS Provisioning, Workshop on Architectures for Quality of Service in the Internet (ART-QoS), Varsaw, March 23-24, 2003.

40.  E. Gurses, G. B. Akar, and N. Akar, Impact of Scalability in Video Transmission in Promotion-Capable Differentiated Services Networks", ICIP (International Conference of Image Processing), Rochester, NY, Sep. 22-25, 2002.  

41.  T. P. R. Nyirenda-Jere, V. S. Frost, and N. Akar, Traffic Handling and Network Capacity in Multi-Service Networks, IEEE GLOBECOM 2001, San Antonio, Texas, USA, Nov. 25-29, 2001. 

42.  T. P.R. Nyirenda-Jere, V.S. Frost, and N. Akar, Impact of Traffic Handling on Internet Capacity, SPIE Information Technologies and Communications Conference, 2001.

43.  L. A. DaSilva, D. W. Petr, and N. Akar, Static Pricing and Quality of Service in Multiple Service Networks, Proc. 5th International Conference on Computer Science and Informatics,  Atlantic City, NJ, vol. 1, pp. 355-358, February 27-March 3, 2000.

44.  R. Rabbat, K. Y. Siu, and N. Akar, Supporting Differentiated Services Using ATM ABR Service, IEEE ICCCN’99, Boston, USA, 1999.

45.  J. Sydir, N. Taft, and N. Akar, Supporting TCP (In)efficiently over ATM, MASCOTS’99, Maryland, USA, 1999.

46.  Wu, K. Y. Siu, N. Akar, and J. Yiu, Leaky Bucket Buffer Admission Scheme for Supporting ATM GFR Services with FIFO Queuing, IEEE GLOBECOM’99,  Rio de Janerio, Brasil, 1999.

47.  L. A. DaSilva, D. W. Petr, and N. Akar, Effects of Pricing in Multiple Service Networks with Resource Allocation, Proceedings of Conference on Performance and Control of Network Systems II, part of the SPIE (International Society of Optical Engineering) International Symposium on Voice, Video and Data Communication, Nov. 1998. 

48.  N. Akar, N. C. Oguz, and K. Sohraby, TELPACK: An Advanced TELetraffic Analysis Package, IEEE GLOBECOM'97, Phoenix, AZ, 1997.

49.  L. A. DaSilva, D. W. Petr, and N. Akar, Equilibrium Pricing in Multi-service Priority-based Networks, IEEE GLOBECOM'97, Phoenix, AZ, 1997.

50.  N. Akar and K. Sohraby, Matrix Geometric Solutions in M/G/1 type Markov Chains with Multiple Boundaries: A Generalized State-Space Approach, International Teletraffic Congress, Washington DC, 1997.

51.  N. Akar and K. Sohraby, Finite and Infinite QBD Chains: A Simple and Unifying Algorithmic Approach, IEEE INFOCOM'97, San Fransisco, USA, 1997.

52.  N. Akar and K. Sohraby, System Theoretic Approach to Teletraffic Problems: A Unifying Framework, Proc. IEEE GLOBECOM'96, London, 2007.

53.  N. Akar and K. Sohraby, A New Paradigm for Teletraffic Analysis of Communication Networks, Proc. IEEE INFOCOM'96, pp. 1318-1326, Boston, USA, 1996.

54.  N. Akar and E. Arikan, Markov Modulated Periodic Arrival Process Offered to an ATM Multiplexer, Proc. IEEE GLOBECOM'93, pp. 783-787, Houston, TX, 1993.

55.  N. Akar and E. Arikan, Pade Approximations in the Analysis of the MMPP/D/1 System, Proc. ITC Spec. Sem. on Teletraffic Analysis Methods for Current and Future Telecom. Networks, pp. 137-143, Nov. 93, Bangalore, India, 1993.

56.  N. Akar and A. B. Ozguler, Exact and Almost Noninteracting Control Problems by Measurement Feedback, International Conference on New Trends in Comm., Contr., and Signal Proc., 779-785, Bilkent University 1990, Ankara, Turkey.

57.  A. B. Ozguler and N. Akar, A Common Solution to a Pair of Linear Matrix Equations Over a Principal Ideal Domain, IFAC Workshop on System Structure and Control: State-space and Polynomial Methods, p. 37-40, 1989, Prague, Czechoslovakia.

 

 

WORKSHOPS AND PRESENTATIONS

1.     N. Akar and K. Sohraby, ‘Numerically Stable Solution of Large-Scale Finite Fluid Queues’, COST 279 Technical Contribution TD(03)011, Dubrovnik, Croatia, January 2003.

2.     E. Karasan, O.E. Karasan, N. Akar, and M. Pinar, ‘Mesh Topology Design in Overlay Virtual Private Networks’, COST 279 Technical Contribution TD(03)010, Dubrovnik, Croatia, January 2003.

3.     N. Akar, M. Atik, I. Dogru, and I. Hokelek, "ATM Multipath Traffic Engineering Using Differentiated ABR", COST 279 Technical Contribution, Helsinki, June 2002.

4.     L. A. DaSilva, D. W. Petr and N. Akar, Static Pricing and Traffic Management in Networks with Allocation of Resources, Second Annual Sprint Applied Research parTners Advanced Networking (SPARTAN) Symposium, May 19-20 1998, Lawrence, KS.

5.     N. Akar and K. Sohraby, Matrix-geometric Algorithmic Solutions for M/G/1 type Markov Chains, presented at INFORMS'97, San Diego, 1997.

6.     A. Agrawal, N. Akar and K. Sohraby, TELPACK: A Robust and Efficient Teletraffic Package for Computer and Communication Networks, presented at Annual Workshop on Computer Communications, Washington DC, 1996.

7.     N. Akar and K. Sohraby, System Theoretic Approach to Teletraffic Problems: A Unifying Framework, presented at Annual Workshop on Computer Communications, Seattle, 1995.

 

Home        Teaching          Publications