All Stories

  1. Scheduling Policies in a Multisource Status Update System With Dedicated and Shared Servers

    Article • IEEE Internet of Things Journal, July 2025, Institute of Electrical & Electronics Engineers (IEEE)

    Nail Akar

  2. Age of Information Analysis of Ber/Geo/1/1 Queue With On-Off Service

    Article • IEEE Internet of Things Journal, January 2025, Institute of Electrical & Electronics Engineers (IEEE)

    Nail Akar

  3. Age of Information in a Single-Source Generate-at-Will Dual-Server Status Update System

    Article • IEEE Transactions on Communications, January 2025, Institute of Electrical & Electronics Engineers (IEEE)

    Nail Akar

  4. Cyclic Scheduler Design for Minimizing Age of Information in Massive Scale Networks Susceptible to Packet Errors

    Article • IEEE Transactions on Information Theory, January 2025, Institute of Electrical & Electronics Engineers (IEEE)

    Nail Akar

  5. Multi-Threshold AoII-Optimum Sampling Policies for Continuous-Time Markov Chain Information Sources

    Article • IEEE Transactions on Information Theory, January 2025, Institute of Electrical & Electronics Engineers (IEEE)

    Nail Akar

  6. Minimizing Age of Information and Its Peak: Finding Cyclic Schedules with Deletion Search

    Article • IEEE Transactions on Communications, January 2025, Institute of Electrical & Electronics Engineers (IEEE)

    Nail Akar

  7. Query-Based Sampling of Heterogeneous CTMCs: Modeling and Optimization With Binary Freshness

    Article • IEEE Transactions on Communications, December 2024, Institute of Electrical & Electronics Engineers (IEEE)

    Nail Akar

  8. Adaptive Frame Coalescing in Energy Efficient Ethernet With Model Predictive Control and Queuing Theory

    Article • IEEE Transactions on Green Communications and Networking, December 2024, Institute of Electrical & Electronics Engineers (IEEE)

    Nail Akar

  9. Modeling Interfering Sources in Shared Queues for Timely Computations in Edge Computing Systems

    Article • October 2024, ACM (Association for Computing Machinery)

    Nail Akar

  10. Water-Filling-Based Scheduling for Weighted Binary Freshness in Cache Update Systems

    Article • IEEE Internet of Things Journal, March 2024, Institute of Electrical & Electronics Engineers (IEEE)

    Nail Akar

  11. Adaptive Frame Coalescing in Energy Efficient Ethernet with Model Predictive Control and Queuing Theory

    Article • December 2023, Institute of Electrical & Electronics Engineers (IEEE)

    Nail Akar

  12. Distribution of Age of Information in Status Update Systems With Heterogeneous Information Sources: An Absorbing Markov Chain-Based Approach

    Article • IEEE Communications Letters, August 2023, Institute of Electrical & Electronics Engineers (IEEE)

    Nail Akar

  13. Is proportional fair scheduling suitable for age-sensitive traffic?

    Article • Computer Networks, May 2023, Elsevier

    Nail Akar

  14. Modeling age of information in a cooperative slotted Aloha network

    Article • Wireless Networks, March 2023, Springer Science + Business Media

    Nail Akar

  15. Exact Analytical Model of Age of Information in Multi-Source Status Update Systems With Per-Source Queueing

    Article • IEEE Internet of Things Journal, October 2022, Institute of Electrical & Electronics Engineers (IEEE)

    Nail Akar

  16. Steady-state and first passage time distributions for waiting times in the $ MAP/M/s+G $ queueing model with generally distributed patience times

    Article • Journal of Industrial & Management Optimization, January 2022, American Institute of Mathematical Sciences (AIMS)

    Nail Akar

  17. The Multi-Source Probabilistically Preemptive M/PH/1/1 Queue With Packet Errors

    Article • IEEE Transactions on Communications, November 2021, Institute of Electrical & Electronics Engineers (IEEE)

    Nail Akar

  18. Discrete-Time Queueing Model of Age of Information With Multiple Information Sources

    Article • IEEE Internet of Things Journal, October 2021, Institute of Electrical & Electronics Engineers (IEEE)

    Nail Akar

  19. Age of Information in a Cooperative Slotted Aloha Network: Marginal and Joint Distributions

    Article • August 2021, Institute of Electrical & Electronics Engineers (IEEE)

    Nail Akar

  20. Age of Information in a Cooperative Slotted Aloha Network: Marginal and Joint Distributions

    Article • August 2021, Institute of Electrical & Electronics Engineers (IEEE)

    Nail Akar

  21. Energy management for age of information control in solar-powered IoT end devices

    Article • Wireless Networks, May 2021, Springer Science + Business Media

    Nail Akar

  22. Power allocation and temporal fair user group scheduling for downlink NOMA

    Article • Telecommunication Systems, April 2021, Springer Science + Business Media

    Nail Akar

  23. Finding the Exact Distribution of (Peak) Age of Information for Queues of PH/PH/1/1 and M/PH/1/2 Type

    Article • IEEE Transactions on Communications, September 2020, Institute of Electrical & Electronics Engineers (IEEE)

    Nail Akar

  24. Transient and First Passage Time Distributions of First- and Second-order Multi-regime Markov Fluid Queues via ME-fication

    Article • Methodology And Computing In Applied Probability, August 2020, Springer Science + Business Media

    Nail Akar

  25. On the Queuing Model of the Energy-Delay Tradeoff in Wireless Links With Power Control and Link Adaptation

    Article • IEEE Transactions on Communications, May 2019, Institute of Electrical & Electronics Engineers (IEEE)

    Nail Akar

  26. Queue management for two-user cognitive radio with delay-constrained primary user

    Article • Computer Networks, September 2018, Elsevier

    Nail Akar

  27. Joint Cell Muting and User Scheduling in Multicell Networks with Temporal Fairness

    Article • Wireless Communications and Mobile Computing, January 2018, Hindawi Publishing Corporation

    Nail Akar

  28. Performance modeling of QoS differentiation in optical packet switching via FDL access limitation

    Article • Photonic Network Communications, May 2017, Springer Science + Business Media

    Nail Akar

  29. Markov fluid queue model of an energy harvesting IoT device with adaptive sensing

    Article • Performance Evaluation, May 2017, Elsevier

    Nail Akar

  30. Disk scheduling with shortest cumulative access time first algorithms

    Article • TURKISH JOURNAL OF ELECTRICAL ENGINEERING & COMPUTER SCIENCES, January 2017, The Scientific and Technological Research Council of Turkey (TUBITAK-ULAKBIM) - DIGITAL COMMONS JOURNALS

    Nail Akar

  31. Fixed-point analysis of a network of routers with persistent TCP/UDP flows and class-based weighted fair queuing

    Article • Telecommunication Systems, July 2016, Springer Science + Business Media

    Nail Akar

  32. The finite/infinite horizon ruin problem with multi-threshold premiums: a Markov fluid queue approach

    Article • Annals of Operations Research, January 2016, Springer Science + Business Media

    Nail Akar

  33. A novel queue-aware wireless link adaptation mechanism and its fixed-point analytical model

    Article • EURASIP Journal on Wireless Communications and Networking, November 2015, Springer Science + Business Media

    Nail Akar

  34. Analytical performance modeling of elastic optical links with aligned spectrum allocation

    Article • Computer Networks, September 2015, Elsevier

    Nail Akar

  35. A Two-Level Temporal Fair Scheduler for Multi-Cell Wireless Networks

    Article • IEEE Wireless Communications Letters, June 2015, Institute of Electrical & Electronics Engineers (IEEE)

    Nail Akar

  36. Fitting Matrix Geometric Distributions by Model Reduction

    Article • Stochastic Models, April 2015, Taylor & Francis

    Nail Akar

  37. Analysis of an Adaptive Modulation and Coding scheme with HARQ for TCP traffic

    Article • April 2015, Institute of Electrical & Electronics Engineers (IEEE)

    Nail Akar

  38. Class-based first-fit spectrum allocation with fragmentation avoidance for dynamic flexgrid optical networks

    Article • Optical Switching and Networking, January 2015, Elsevier

    Nail Akar

  39. Mapping time-varying IP traffic to flexible optical paths in flexgrid optical networks

    Article • Photonic Network Communications, August 2014, Springer Science + Business Media

    Nail Akar

  40. Workload-dependent queuing model of an AQM-controlled wireless router with TCP traffic and its application to PER-based link adaptation

    Article • EURASIP Journal on Wireless Communications and Networking, April 2014, Springer Science + Business Media

    Nail Akar

  41. Efficient transport of time-varying IP traffic in flexi-grid optical networks

    Article • April 2014, Institute of Electrical & Electronics Engineers (IEEE)

    Nail Akar

  42. Dimensioning shared-per-node recirculating fiber delay line buffers in an optical packet switch

    Article • Performance Evaluation, December 2013, Elsevier

    Nail Akar

  43. Running Multiple Instances of the Distributed Coordination Function for Air-Time Fairness in Multi-Rate WLANs

    Article • IEEE Transactions on Communications, December 2013, Institute of Electrical & Electronics Engineers (IEEE)

    Nail Akar

  44. The workload-dependent MAP/PH/1 queue with infinite/finite workload capacity

    Article • Performance Evaluation, December 2013, Elsevier

    Nail Akar

  45. Analysis of continuous feedback Markov fluid queues and its applications to modeling Optical Burst Switching

    Article • September 2013, Institute of Electrical & Electronics Engineers (IEEE)

    Nail Akar

  46. Delay Analysis of Timer-Based Frame Coalescing in Energy Efficient Ethernet

    Article • IEEE Communications Letters, July 2013, Institute of Electrical & Electronics Engineers (IEEE)

    Nail Akar

  47. State aggregation-based model of asynchronous multi-fiber optical switching with shared wavelength converters

    Article • Optical Switching and Networking, July 2013, Elsevier

    Nail Akar

  48. A distributed solution for air-time fairness in multi-rate WLANs

    Article • April 2013, Institute of Electrical & Electronics Engineers (IEEE)

    Nail Akar

  49. Moments of Conditional Sojourn Times in Finite Capacity M/M/1/N-PS Processor Sharing Queues

    Article • IEEE Communications Letters, April 2012, Institute of Electrical & Electronics Engineers (IEEE)

    Nail Akar

  50. Retrial Queuing Models of Multi-Wavelength FDL Feedback Optical Buffers

    Article • IEEE Transactions on Communications, October 2011, Institute of Electrical & Electronics Engineers (IEEE)

    Nail Akar

  51. Analytical model of asynchronous shared-per-wavelength multi-fiber optical switch

    Article • July 2011, Institute of Electrical & Electronics Engineers (IEEE)

    Nail Akar

  52. Comparative analysis of power consumption in asynchronous wavelength modular optical switching fabrics

    Article • Optical Switching and Networking, July 2011, Elsevier

    Nail Akar

  53. MPLS automatic bandwidth allocation via adaptive hysteresis

    Article • Computer Networks, April 2011, Elsevier

    Nail Akar

  54. TCP flow aware adaptive path switching in diffserv enabled MPLS networks

    Article • European Transactions on Telecommunications, January 2011, Wiley

    Nail Akar

  55. Shared-per-wavelength asynchronous optical packet switching: A comparative analysis

    Article • Computer Networks, September 2010, Elsevier

    Nail Akar

  56. Dynamic threshold-based assembly algorithms for optical burst switching networks subject to burst rate constraints

    Article • Photonic Network Communications, April 2010, Springer Science + Business Media

    Nail Akar

  57. A survey of quality of service differentiation mechanisms for optical burst switching networks

    Article • Optical Switching and Networking, January 2010, Elsevier

    Nail Akar

  58. System-theoretical algorithmic solution to waiting times in semi-Markov queues

    Article • Performance Evaluation, November 2009, Elsevier

    Nail Akar

  59. Exact Analysis of Single-Wavelength Optical Buffers With Feedback Markov Fluid Queues

    Article • Journal of Optical Communications and Networking, October 2009, Optical Society of America (OSA)

    Nail Akar

  60. Performance Evaluation of Slotted Optical Burst Switching Systems With Quality of Service Differentiation

    Article • Journal of Lightwave Technology, July 2009, Institute of Electrical & Electronics Engineers (IEEE)

    Nail Akar

  61. Fixed point analysis of limited range share per node wavelength conversion in asynchronous optical packet switching systems

    Article • Photonic Network Communications, February 2009, Springer Science + Business Media

    Nail Akar

  62. Exact analysis of offset-based service differentiation in single-channel multi-class OBS

    Article • IEEE Communications Letters, February 2009, Institute of Electrical & Electronics Engineers (IEEE)

    Nail Akar

  63. Solving Multi-Regime Feedback Fluid Queues

    Article • Stochastic Models, August 2008, Taylor & Francis

    Nail Akar

  64. Markov zinciri tabanlı Güvenilirlik modellemesi

    Article • April 2008, Institute of Electrical & Electronics Engineers (IEEE)

    Nail Akar

  65. Performance Analysis of an Optical Packet Switch Employing Full/Limited Range Share Per Node Wavelength Conversion

    Article • November 2007, Institute of Electrical & Electronics Engineers (IEEE)

    Nail Akar

  66. Model-free Adaptive Hysteresis for Dynamic Bandwidth Reservation

    Article • October 2007, Institute of Electrical & Electronics Engineers (IEEE)

    Nail Akar

  67. A Performance Evaluation Framework of A Rate-Controlled MPEG Video Transmission over UMTS Networks

    Article • July 2007, Institute of Electrical & Electronics Engineers (IEEE)

    Nail Akar

  68. Packet Loss Analysis of Synchronous Buffer-less Optical Switch with Shared Limited Range Wavelength Converters

    Article • May 2007, Institute of Electrical & Electronics Engineers (IEEE)

    Nail Akar

  69. Research in optical burst switching within the e-Photon/ONe network of excellence

    Article • Optical Switching and Networking, February 2007, Elsevier

    Nail Akar

  70. Stochastic Analysis of Finite Population Bufferless Multiplexing in Optical Packet/Burst Switching Systems

    Article • IEICE Transactions on Communications, February 2007, Institute of Electronics, Information and Communications Engineers (IEICE)

    Nail Akar

  71. Optimal packet scheduling and rate control for video streaming

    Article • January 2007, SPIE

    Nail Akar

  72. Comparative study of limited-range wavelength conversion policies for asynchronous optical packet switching

    Article • Journal of Optical Networking, January 2007, Optical Society of America (OSA)

    Nail Akar

  73. Wavelength converter sharing in asynchronous optical packet/burst switching: An exact blocking analysis for markovian arrivals

    Article • IEEE Journal on Selected Areas in Communications, December 2006, Institute of Electrical & Electronics Engineers (IEEE)

    Nail Akar

  74. Solving the ME/ME/1 queue with state–space methods and the matrix sign function

    Article • Performance Evaluation, February 2006, Elsevier

    Nail Akar

  75. A Performance Study of Limited Range Partial Wavelength Conversion for Asynchronous Optical Packet/Burst Switching

    Article • January 2006, Institute of Electrical & Electronics Engineers (IEEE)

    Nail Akar

  76. A matrix analytical method for the discrete time Lindley equation using the generalized Schur decomposition

    Article • January 2006, ACM (Association for Computing Machinery)

    Nail Akar

  77. Optimal Streaming Under Rate Constraints ( İ ngilizce)

    Article • January 2006, Institute of Electrical & Electronics Engineers (IEEE)

    Nail Akar

  78. Solving the single server semi-Markov queue with matrix exponential kernel matrices for interarrivals and services

    Article • January 2006, ACM (Association for Computing Machinery)

    Nail Akar

  79. Rate-controlled optical burst switching for both congestion avoidance and service differentiation

    Article • Optical Switching and Networking, December 2005, Elsevier

    Nail Akar

  80. Capacity requirements of traffic handling schemes in multi-service networks

    Article • Computer Communications, November 2005, Elsevier

    Nail Akar

  81. A simple and effective mechanism for stored video streaming with TCP transport and server-side adaptive frame discard

    Article • Computer Networks, July 2005, Elsevier

    Nail Akar

  82. Computing Moments of First Passage Times to a Subset of States in Markov Chains

    Article • SIAM Journal on Matrix Analysis and Applications, January 2005, Society for Industrial & Applied Mathematics (SIAM)

    Nail Akar

  83. Infinite- and finite-buffer Markov fluid queues: a unified analysis

    Article • Journal of Applied Probability, June 2004, Cambridge University Press

    Nail Akar

  84. Combined Use of Prioritized AIMD and Flow-Based Traffic Splitting for Robust TCP Load Balancing

    Article • January 2004, Springer Science + Business Media

    Nail Akar

  85. Reinforcement Learning as a Means of Dynamic Aggregate QoS Provisioning

    Article • January 2003, Springer Science + Business Media

    Nail Akar

  86. Mesh topology design in overlay virtual private networks

    Article • Electronics Letters, January 2002, the Institution of Engineering and Technology (the IET)

    Nail Akar

  87. <title>Impact of traffic handling on Internet capacity</title>

    Article • July 2001, SPIE

    Nail Akar

  88. A novel computational method for solving finite qbd processes

    Article • Communications in Statistics Stochastic Models, January 2000, Taylor & Francis

    Nail Akar

  89. <title>Effects of pricing in multiple-service networks with resource allocation</title>

    Article • October 1998, SPIE

    Nail Akar

  90. Matrix-geometric solutions of M/G/1-type Markov chains: a unifying generalized state-space approach

    Article • IEEE Journal on Selected Areas in Communications, June 1998, Institute of Electrical & Electronics Engineers (IEEE)

    Nail Akar

  91. TELPACK: an advanced teletraffic analysis package

    Article • IEEE Communications Magazine, January 1998, Institute of Electrical & Electronics Engineers (IEEE)

    Nail Akar

  92. An invariant subspace approach in m/g/l and g/m/l type markov chains

    Article • Communications in Statistics Stochastic Models, January 1997, Taylor & Francis

    Nail Akar

  93. Matrix geometric solutions in M/G/1 type Markov chains with multiple boundaries: A generalized state-space approach

    Article • January 1997, Elsevier

    Nail Akar

  94. A numerically efficient method for the MAP/D/1/K queue via rational approximations

    Article • Queueing Systems, March 1996, Springer Science + Business Media

    Nail Akar

  95. Markov modulated periodic arrival process offered to an ATM multiplexer

    Article • Performance Evaluation, April 1995, Elsevier

    Nail Akar

  96. A common solution to a pair of linear matrix equations over a principal ideal domain

    Article • Linear Algebra and its Applications, January 1991, Elsevier

    Nail Akar

  97. Differentiated abr: a new architecture for flow control and service differentiation in optical burst switched networks

    Article • Institute of Electrical & Electronics Engineers (IEEE)

    Nail Akar

  98. Exact calculation of blocking probabilities for bufferless optical burst switched links with partial wavelength conversion

    Article • Institute of Electrical & Electronics Engineers (IEEE)

    Nail Akar

  99. A reordering-free multipath traffic engineering architecture for DiffServ-MPLS networks

    Article • Institute of Electrical & Electronics Engineers (IEEE)

    Nail Akar

  100. Capacity analysis of a PMR system with DAB downlink

    Article • Institute of Electrical & Electronics Engineers (IEEE)

    Nail Akar

  101. Dynamic capacity management for voice over packet networks

    Article • Institute of Electrical & Electronics Engineers (IEEE)

    Nail Akar

  102. Supporting differentiated services using ATM ABR service

    Article • Institute of Electrical & Electronics Engineers (IEEE)

    Nail Akar

  103. Equilibrium pricing in multi-service priority-based networks

    Article • Institute of Electrical & Electronics Engineers (IEEE)

    Nail Akar