Research Interests: Applications of combinatorial optimization in different domains inluding transportation and logistics, health, telecommunications systems; sequential testing problem.
Journal Publications:
Tanoumand N, Ünlüyurt T, “An exact algorithm for the resource constrained home health care vehicle routing problem”, Annals of Operations Research, 204. 397-425, 2021.
Yavuz T, Kundakçıoğlu ÖE, Ünlüyurt T, “Exact and heuristic approaches to detect failures in failed k-out-of-n systems”, Computers & Operations Research, 112, 104752, 2019.
Shahmoradi Z, Ünlüyurt T, “Failure Detection for Series Systems When Tests are Unreliable”, Computers and Industrial Engineering, 118, 309-318, 2018.
Hosseini SA, Şahin G, Ünlüyurt T, “A penalty-based scaling algorithm for the multi-period multi-product distribution planning problem”, Engineering Optimization, 49, (4), 583-596, 2017.
Daldal R, Özlük Ö, Selçuk B, Shahmoradi Z, Ünlüyurt T, “Sequential testing in batches”, Annals of Operations Research, 253, (1), 97-117, 2017.
Allen SR, Hellerstein L, Kletenik D, Ünlüyurt T, “Evaluation of monotone DNF formulas”, Algorithmica, 77, (3), 661-685, 2017.
Daldal R, Gamzu I, Segev D, Ünlüyurt T, “Approximation algorithms for sequential batch-testing of series systems”, Naval Research Logistics, 63, (4), 275-286, 2016.
Ünlüyurt T, Tunçer Y, “Estimating the performance of emergency medical service location models via discrete event simulation”, Computers & Industrial Engineering, 102, 467-475, 2016.
Türker UC, Ünlüyurt T, Yenigün H, “Effective algorithms for constructing minimum cost adaptive distinguishing sequences”, Information and Software Technology, 74, 69-85, 2016.
Hosseini SA, Şahin G, Ünlüyurt T, A Polyhedral-Based Approach for the Multi-Period Multi-Commodity Networks, Journal of Applied Mathematics, 2014.
Ünlüyurt T, Aydın C, Improved rehandling strategies for container retrieval process, Journal of Advanced Transportation, 46, (4), 378-393, 2012.
Başar A, Çatay B, Ünlüyurt T, A taxonomy for emergency service station location problem, Optimization Letters,6, (6), 1147-1160, 2012.
Çatay B, Özlük Ö, Ünlüyurt T, TestAnt: An ant colony system approach to sequential testing under precedence constraints, Expert Systems with Applications, 38, 14945-14951, 2011.
Başar A, Çatay B, Ünlüyurt T, A multi-period double coverage approach for locating the emergency medical service stations in Istanbul, Journal of The Operational Research Society, 62, (4), 627-637, 2011.
Ünlüyurt T, Boros E, A note on “Optimal resource allocation for security in reliability systems”, European Journal of Operational Research, 199, (2), 601-603, 2009.
Bülbül K, Erçetin Ö, Ünlüyurt T, Hop Constrained Energy Efficient Broadcasting: Insights from Massively Dense Ad Hoc Networks, IEEE Tran. in Mobile Computing, 8, (2): 188-202, 2009.
Çatay B, Başar A, Ünlüyurt T, İstanbul’da Acil Yardım İstasyonlarının Yerlerinin Planlanması (Planning the Locations of the Emergency Medical Service Stations in Istanbul), Endüstri Mühendisliği, 4: 20-35, 2008. (in Turkish)
Kundakçıoğlu ÖE, Ünlüyurt T, Bottom-up Construction of Minimum Cost AND/OR Trees for Sequential Fault Diagnosis, IEEE Tran. in Systems, Man and Cybernetics, Part A: Systems and Humans, 37, (5): 621-629, 2007.
Ünlüyurt T, Testing systems of identical components, Journal of Combinatorial Optimization, 10, (3):261-282, 2005.
Ünlüyurt T, Sequential testing of complex systems: A review, Discrete Applied Mathematics, 142, (1-3):189-205, 2004.
Boros E, Ünlüyurt T, Diagnosing double regular systems, Annals of Mathematics and Artificial Intelligence, 26, (1-4):171-191,1999.
Book Chapter:
Boros E, Ünlüyurt T, Sequential testing of series-parallel systems of small depth, In: Computing Tools for Modeling, Optimization and Simulation, 39-74, 2000, Laguna and Velarde eds., Kluwer Academic Publishers, Boston.
Volumes Edited:
Kundakcioglu OE, Ulusoy G, Ünlüyurt T, Special Issue on 30th National Conference on Operations Research and Industrial Engineering, Optimization Letters, 6, (6), 2012.
Conference Proceedings:
Shokirov N, Çatay B, Ünlüyurt T, “Crew constrained home health care routing problem with time windows and synchronized visits” Proceedings of Global Joint Conference on Industrial Engineering and Its Application Areas, 87-96, 2020.
Afghah SMR, Özlük Ö, Ünlüyurt T, “Capacity allocation and pricing strategies for cloud computing service providers”, Proceedings of the 48th Conference on Computers & Industrial Engineering, 2019.
Daldal R, Shahoradi Z, Ünlüyurt T, “Estimating the expected cost of function evaluation strategies”, Proceedings of Global Joint Conference on Industrial Engineering and Its Application Areas, 229-239, 2019.
Akcapinar K, Gurbuz O, Ünlüyurt T, “Optimal Power Control for Full Duplex Wireless Networks with Full Interference”, International Balkan Conference on Communications and Networking, Tirana, Albenia, May 31-June 2, 2017.
Tozlu B, Daldal R, Ünlüyurt T, Çatay B,” Crew constrained home care routing problem with time windows “, IEEE Symposium Series on Computational Intelligence (2015), USA: IEEE (Institute of Electrical and Electronics Engineers) 2015, 1751-1757.
Türker UC, Ünlüyurt T, Yenigün H, ” Lookahead-based approaches for minimizing adaptive distinguishing sequences “, Merayo, Mercedes G. and Montes de Oca, Edgardo (eds.), 26th IFIP International Conference on Testing Software and Systems, Madrid: Springer Berlin Heidelberg, September 2014, 32-47.
Allen SR, Hellerstein L, Kletenik D, Ünlüyurt T, ” Evaluation of DNF formulas “, International Symposium on Artificial Intelligence and Mathematics (ISAIM 2014), Boca Raton, FL: Florida Atlantic University, January 2014.
Ünlüyurt T, Tunçer Y,” Estimating the performance of EMS location models via simulation “, 44th International Conference on Computers & Industrial Engineering (CIE’44) / 9th International Symposium on Intelligent Manufacturing & Service Systems (IMSS’14), Sakarya, Turkey: Sakarya Univesity 2014.
Işık G, Ünlüyurt T, ” Sequential testing of 3-level deep series-parallel systems“, IEEE International Conference on Industrial Engineering and Engineering Management (IEEM), USA: IEEE (Institute of Electrical and Electronics Engineers), December 2013.
Ünlüyurt T, Aydın C, “Rehandling strategies for container retrieval“, 13th Euro Working Group on Transportation Meeting (EWGT2009), Padua, Italy: University of Padova, September 2009.
Başar A, Çatay B, Ünlüyurt T, “A new model and tabu search approach for planning the emergency service stations“, Fleischmann, Bernhard and Borgwardt, Karl Heinz and Klein, Robert and Tuma, Axel (eds.), Annual International Conference of the German Operations Research Society, 2008, Berlin Heidelberg: Springer, August 2009, 41-46.
Çatay B, Ozluk O, Ünlüyurt T, An Ant Colony Algorithm for the Sequential Testing Problem under Precedence Constraints, IEEE International Conference on Service Operations and Logistics, and Informatics, IEEE/SOLI, 1800-1805, 2008.
Bulbul K, Ercetin O, Ünlüyurt T, Delay Constrained Minimum Power Broadcasting in Wireless Networks, In: Proc. of 5th Intl. Symposium on Modeling and Optimization in Mobile, Ad Hoc, and Wireless Networks (Wiopt), 1-9, 2007.
Tacettin M, Ünlüyurt T, An alternative proof that exact inference problem on Bayesian belief networks is NP-hard, In: P. Yolum, T. Gungor, F. Gurgen, C. Ozturan, eds., Proc. of ISCIS 2005, LNCS 3733, 947-955, Istanbul, Turkey, 2005.
Ünlüyurt T, Özdemir HM, Space allocation and location matching in container terminals, In: A. Jaszkiewicz, M. Kaczmarek, J. Zak, M. Kubiak, eds., Advanced OR and AI Methods in Transportation, Proc. of 10th EWGT Meeting and 16th Mini-EURO Conference, 367-373, Poznan, Poland 2005.
Aksu A, Erçetin Ö, Ünlüyurt T, Bülbül K, Kılıç K, Energy Efficient and Reliable Routing with Cooperative Diversity in Wireless Ad-hoc Networks, In: T. Tuğcu, E. Gelenbe, M.U. Çağlayan, F. Alagöz, eds., Proc. of ISCIS 2005, Advances in Computer Science and Engineering Series, 339-348, 2005.
Kundakçıoğlu ÖE, Bülbül K, Ünlüyurt T, Kılıç K, Erçetin Ö, Minimum Power Multicasting with Delay Bound Constraints in Ad Hoc Wireless Networks, In: T. Tuğcu, E. Gelenbe, M.U. Çağlayan, F. Alagöz, eds., Proc. of ISCIS 2005, Advances in Computer Science and Engineering Series, 252-263, 2005.
Lacksonen T, Ünlüyurt T, A global manufacturing system design project partnership, In: Electronic Proceedings of the 2003 ASEE/WFEO International Colloquium, American Society for Engineering Education.
Boros E, Ünlüyurt T, Diagnosing double regular systems, In: Artificial Intelligence and Mathematics — AIM’98, Electronic Proceedings of the Fifth International Symposium on Artificial Intelligence and Mathematics, January , 1998, E. Boros and R. Greiner, eds.
Projects:
Researcher, Examination of Finite State Machine Specification Methods for Testing Functional Requirements of Digital Systems and the Development of New Heuristic Approaches, TUBITAK International, 114E921, 2015-2017.
Principle Investigator, Two extensions of the Sequential Testing Problem: Jointly batching and sequencing tests and estimating the expected cost of testing strategies TUBITAK 1001 , 113M478 Program. Budget: 154.250 TL, 2013-2016.
Researcher, Heuristics for generating short adaptive distinguishing sequences, TUBITAK 1002 program, 113E292. Budget: 16.500 TL, 2013-2014.
Project Director, Developing evacuation strategies in the case of a disaster, Projem İstanbul, İBB. Budget: 15.000 TL, 2007-2009.
Project Director, Optimization of marine transportation system of Istanbul, Projem İstanbul, İBB. Budget: 15.000 TL, 2007-2008.
Researcher, Decision support systems for waste collection, Projem İstanbul, İBB. Budget: 10.000 TL, 2006-2008.
Researcher, Planning the locations of emergency medical stations in Istanbul, Projem İstanbul, İBB. Budget: 10.000 TL, 2006-2007.
Researcher, Project Analysis and Development Methodology, September 2002-November 2003. (Supported by Logo Business Solutions)
Graduate Student Supervision:
Eda Dilan Özyüksel, MS, 2023, Integrated oncologist consultation and chemotherapy appointment coordination under uncertainty in outpatient chemotherapy clinics. (co-advised with Serhat Gül)
Gülnihal Özcan, MS, 2023, Testing connectivity to safe locations after a disaster using drones.
Gülten Büşra Karkılı, MS, 2020, Optimization models for routing and frequency assignment in wireless mesh networks.
Neda Tanoumand, MS, 2017, A branch and price algorithm for resource constrained vehicle routing problem with time windows.
Mohamad Reza Afgafh, MS, 2017, A simulation analysis of different allocation and pricing policies for cloud computing service providers.
Rebi Daldal (Gürsel Sönmez Research Awardee) MS, 2015, Sequential testing of a series system in batches.
Zahed Shahmoradi MS, 2015, Fault localization of a series system when tests are unreliable.
Başak Tozlu MS, 2015, Modeling and analysis of a home care routing problem.
Seyed Ahmad Hosseini, PhD, 2014. Multi Period Multi Commodity Network Flows. (co-advised with Güvenç Şahin)
Gürkan Işık MSc 2014, Sequential testing of series parallel systems.
Elif Özdemir, MS, 2011. Testing Strategies for k out of n Systems under General Type Precedence Constraints.
Yasir Tunçer, MS, 2011. Estimating the Performance of EMS Location Models via Simulation.
Aydın Tanrıverdi, MS, 2008. Testing Strategies for k out of n Systems under Forest Type Precedence Constraints.
Ayfer Başar, MS, 2008. (Co-supervised with Bülent Çatay) Planning of Emergency Medical Service Stations and Ambulances.
Mustafa Kümek, MS, 2007. Ship Self Air Defense Analysis for Different Operation Conditions Using Simulation.
Cenk Aydın, MS, 2006. Improved Rehandling Strategies for Container Retrieval Process.
Erhun Kundakçıoğlu, MS, 2004. Sequential Classification via Sequential Testing.
Hacı Murat Özdemir, MS, 2003. Hierarchical Modeling and Analysis of Container Terminal Operations.
Ekim Özaydın, MS, 2003. Capacitated Vehicle Routing Problem with Time Windows.
Öykü Oflezer, MS, 2002 (Co-supervised with Bülent Çatay). Operations Reversal: An Investigation of Capacitated and Uncapacitated Models.
Mustafa Tacettin, MS, 2002. A Polynomial Transformation from Vertex Cover Problem to Exact Inference Problem.
Ercüment Kenger (Boğaziçi University), MS, 2002. (Co-supervised with Gülay Barbarasoğlu). Airline Rescheduling Operations: A Heuristic Approach.