PUBLICATIONS
For IEEE Publications:
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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.
I. Cosandal, N. Akar, S.
Ulukus, “Multi-Threshold AoII-Optimum Sampling
Policies for CTMC Information Sources", to appear in IEEE Trans. Inf. Theory,
2025.
2.
H. Zeng et al., "Age of
Information Analysis of Ber/Geo/1/1 Queue with On-Off Service," to appear
in IEEE Internet of Things Journal, 2025.
3.
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.
4.
Sahan Liyanaarachchi, Sennur
Ulukus, and Nail Akar, “Scheduling Policies in a Multi-Source Status
Update System with Dedicated and Shared Servers”, to appear in IEEE
Internet of Things Journal, 2025.
5.
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.
6.
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.
7.
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.
8.
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.
9.
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.
10. 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.
11. Nail Akar and Ezhan Karasan, “Is Proportional Fair Scheduling
Suitable for Age-Sensitive Traffic?”, Computer Networks,
109668, vol. 226, May 2023.
12. 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.
13. 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.
14. 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.
15. 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.
16. 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.
17. 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.
18. 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).
19. 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.
20. 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.
21. 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.
22. 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
23. 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.
24. 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.
25. 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.
26. 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.
27. 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.
28. 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
29. 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.
30. 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.
31. N. Akar, “Fitting Matrix Geometric Distributions by Model
Reduction,” Stochastic Models, Vol. 31, Iss. 2, 2015.
32. 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.
33. 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.
34. 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.
35. 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.
36. 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.
37. 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 .
38. 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.
39. 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.
40. 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.
41. 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.
42. 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.
43. 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.
44. N. Akar
and M. A. Toksoz, “MPLS
Automatic Bandwidth Allocation via Adaptive Hysteresis”, Computer
Networks, vol.
55, no. 5, pp. 1181-1196, April 2011.
45. 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.
46. 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.
47. 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.
48. 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.
49. 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.
50. 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.
51.
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.
52.
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.
53. H. E. Kankaya
and N. Akar,
“Solving
Multi-Regime Feedback Fluid Queues”, Stochastic Models, vol.
24, issue. 3, pp. 425-450, 2008.
54. 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.
55. 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.
56. 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.
57. 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.
58. 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.
59. 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.
60. 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.
61. 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.
62. 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.
63. 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.
64. 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.
65. 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.
66. E. Karasan, O. Ekin-Karasan,
N. Akar, and M. Pinar, "Mesh
Topology Design in Overlay Virtual Private Networks", IEE Electronics Letters, August 2002.
67. N. Akar, N. C. Oguz, and K.
Sohraby, “A
Novel Computational Method for Solving Finite QBD Processes”, Stochastic Models, 2000.
68. N. Akar, N. C. Oguz, and K.
Sohraby, “TELPACK:
An Advanced Teletraffic Analysis Package”, IEEE Communications Magazine,
August 1998.
69. 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.
70. 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.
71. 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.
72. N. Akar and E. Arikan,
“Markov
Modulated Periodic Arrival Process Offered to an ATM Multiplexer”, Performance Evaluation,
Vol. 22, p. 175-190, 1995.
73. 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.