Applied probability, stochastic processes,
Application of Markov decision processes on real
systems such as call centers, supply chains and marketing applications
Revenue management and pricing
Analysis of telecommunication systems using
Statistical analysis and estimation of random
Publications in Refereed Journals
- Örmeci E. L., Güneş, E. D., Kunduzcu, D., Admission
Control and Scheduling for Preventive Services, Manufacturing &
Service Operations Management, 18:2, 227-244, 2016.
- Çakan N., Akşin O. Z.,
Karaesmen F., Örmeci E. L., Joint Flexibility and Capacity Design with
Human Resource Considerations, Production & Operations Management, 24:7, 10861100, 2015.
Turgay, Z. Z., Karaesmen, F.,
Örmeci, E. L. A Robust Revenue Management Problem with Interval
Uncertainty, Annals of Operations Research, 231:1, 207-228, 2015.
Güneş, E. D., Örmeci E. L.,
Kunduzcu, D., Preventing and Diagnosing Colorectal Cancer with a Limited
Colonoscopy Resource, Production & Operations Management, 24:1, 120, 2015.
Örmeci E. L., Salman S.,
Yücel, E., Staff rostering in call centers providing employee
transportation, OMEGA, 43, 4153, 2014.
Kaya, O., Kubali D., Örmeci
E. L., Stochastic Models for the Coordinated Production and Shipment
Problem in a Supply Chain, Computers & Industrial Engineering, 64:3,
Yücel, E., Salman S., Gel E.
S., Örmeci E. L, Gel A. Optimizing Specimen Collection for Processing in
Clinical Testing Laboratories, European Journal of Operational Research,
227:3, 503514, 2013.
Yücel, E., Salman S., Örmeci
E. L, Gel E. S., A constant-factor approximation algorithm for
multi-vehicle collection for processing problem, Optimization Letters, 7:7,
Çil E. B., Karaesmen F.,
Örmeci E. L., Dynamic Pricing and Scheduling in a
Multi-Class Single-Server Queueing System, Queueing Systems, 67:
Y., Güllü R., Örmeci E. L., Admission and Termination Control of a Two Class
Loss System, Stochastic Models, 27: 2-25, 2011.
Akşin O. Z., Güneş,
E. D., Örmeci, E. L., Özden, S. H., Modeling Customer Reactions to Sales
Attempts: When Cross-Selling Backfires, Journal of Service Research,
vol 13, 168-183, 2010.
Örmeci, E. L., and Akşin O. Z., Revenue Management
Through Dynamic Cross-Selling in Call Centers, Production and
Operations Management, 19(6): 742-756, 2010.
Çil E. B., Örmeci E. L., Karaesmen F., Effects of
System Parameters on the Optimal Policy Structure in a Class of
Queueing Control Problems, Queueing Systems, vol 61, 273-304, 2009.
Gayon, J. P., Talay I., Karaesmen F., and Örmeci, E. L.,
and Production Policies of a Make-to-Stock System with Fluctuating Demand,
Probability in the Engineering and Informational Sciences, vol
23, 205-230, 2009.
E.B., Örmeci E.L., and Karaesmen F., Structural Results on a Batch Acceptance Problem,
Mathematical Methods of
Operations Research, vol 66:2, 263-274, 2007.
Örmeci E. L., Gürsoy, A., Tunca, G., and Erman B., Computational Basis of
Knowledge-Based Conformational Probabilities Derived from Local and Long-Range
Interactions in Proteins, PROTEINS: Structure, Function, and
Bioinformatics, vol 66, No:1, 29-40, 2007.
Örmeci, E.L. and van der Wal J.,
Admission Policies for
a Two Class Loss System with General Interarrival Times, Stochastic
Models, Vol. 22, 37-53, 2006.
Örmeci, E.L. and Burnetas A.N.,
Dynamic admission control for
systems with batch arrivals, Advances App. Prob., Vol.
37, 915-937, 2005.
Örmeci, E.L. and Burnetas A.N.,
Admission control with batch arrivals, Operations Research Letters,
Vol. 32, 448-454, 2004.
Dynamic admission control in a call center with one shared and
two dedicated service facilities, IEEE Transactions on Automatic Control,
Vol. 49, 1157-1161, 2004.
Resing J. and Örmeci, E.L.,
A Tandem Queueing Model with Coupled Processors,
Operations Research Letters, Vol. 31, 383-389, 2003.
Örmeci, E.L., Burnetas A.N. and Emmons H.,
Admission Policies for a Two Class
Loss System with Random Rewards, IIE Transactions: Industrial Engineering
Research and Development, Vol 34, 813-822, 2002.
Örmeci, E.L., Burnetas A.N. and van der Wal J.,
Admission Policies for a Two
Class Loss System, Stochastic Models, Vol. 17, Issue Nr. 4, 513-540,
Publications in Refereed Conference Proceedings
Emil, E., Salman, S., and Örmeci, E. L., Shift Scheduling in Call Centers
with Multiple Skill Sets and Transportation Costs, IEEE International
Conference on Service Operations and Logistics, and Informatics, 2007.
E.B., Karaesmen F., and Örmeci E.L.,
Sensitivity Analysis on a Dynamic Pricing Problem of an M/M/c Queueing System,
12th IFAC Symposium on Information Control Problems in Manufacturing
(INCOM), 2006. (Technical
Gayon, J.P., Talay I., and Karaesmen F., Optimal
Policies under Different Pricing Strategies in a Production System with
Markov-Modulated Demand, System Modeling and
Optimization - Proceedings of 22nd IFIP TC 7 Conference, eds. Ceragioli,
F., Dontchev, A., Furuta, H., Marti, K. Pandolfi L., 239-250, 2006.
Çakan N., Akşin O. Z., Karaesmen F., and Örmeci E. L., Joint Flexibility and
Capacity Design in Service and Manufacturing Systems, Prague Stochastics,
Publications in Other Conference Proceedings
Refereed Book Chapters
Akşin O. Z.,
Karaesmen F., and Örmeci E. L., A Review of Workforce Cross-Training in Call
Centers from an Operations Management Perspective, in Handbook on Workforce
Cross Training, ed. D. Nembhard, CRC Press, 2007.
Research in Progress
Örmeci, E. L., Savin, S., Optimal Mix of Surgical Procedures Under
Stochastic Patient Length of Stay.
Boudali, O., Örmeci, E. L.,
Admission Control Policies in Markovian queues with batch services.
Boudali, O., Burnetas
A.N., Örmeci, E. L., Equilibrium customer behavior in the M/M/1
queue with batch arrivals.
Ö., Güneş, E. D., Örmeci E. L., Evaluation of Factors on the
Transmission of Multidrug-Resistant Organisms with an Emphasis on the
Effects of Infected Neighboring Patients.
Kurt, N., Örmeci
E. L., A Stylized Bed Allocation Model for a Turkish Private Hospital with
a Two Class Loss System.
Turgay, Z. Z.,
Karaesmen, F., Örmeci, E. L. Robust Control of Stochastic and Queueing
Yücel, E., Salman
F. S., Örmeci E. L., Gel, E. S. , Gel A., Logistics of Clinical Testing:
Bicriteria Heuristics for Routing and Scheduling of Specimen Collection.
TÜBİTAK, 2012 - 2014:
Optimal Patient Admission Policies Under Random Patient Length of Stay;
Principal Investigator: E. L. Örmeci.
2006-2008: Workforce Planning for Call Centers; Principal Investigator: E. L.
Örmeci; Investigators: D. Aksen, A. Erdem (Boğaziçi Üniversitesi), F. S. S.
Salman, S. Savaş.
Flexibility Design and Optimization in Service Systems; Co-Principal
Investigators: O. Z. Akşin, F. Karaesmen, E. L. Örmeci.
KÜMPEM, 2004-2005: Cross-Selling in Call Centers:
Accounting for Customer Reactions; Co-Principal Investigators: O. Z. Akşin, E.
D. Güneş, E. L. Örmeci.
UNIVERSITY OF PENNSYLVANIA,
Wharton School of Management,
Philadelphia, Pennsylvania, USA, 2010
Visiting Scholar, The Operations,
Information and Decisions Department
Technical University of Eindhoven (TUE), The Netherlands 1999-2001
Research Fellow, Stochastic Networks Group
theoretical background for the control of loss systems, and started its
application on call centers, which have been one of the most cost-effective
means of responding to customers in many different industries, including
banking and finance, for the last decades.
Worked on the
project funded by Philips
Research on the mathematical analysis of access networks, with
particular emphasis on self regulation to complement and strengthen the
simulation based approach to performance analysis of access networks, as
carried out within Philips Research as well as to strengthen the position of
Philips Research in the field of the performance analysis of stochastic
PROFESSIONAL ACTIVITIES AND AFFILIATIONS
Co-Chair, 18th INFORMS Applied Probability Society Conference, July 2015.
Co-Organizer of Koç
University Healthcare Operations Workshop, July 2011-2015.
member, 39th annual meeting of the EURO working group on Operational
Research Applied to Health Services (ORAHS), July 2013.
session Hospital Operations, INFORMS Healthcare Conference, Chicago, USA,
member, 4th Meeting of the EURO Working Group on Stochastic Modeling, Ecole
Centrale Paris, Paris, May-June 2012.
member, 3rd Meeting of the EURO Working Group on Stochastic Modeling,
University of Athens, Athens, June 2010.
Co-Organizer of session Workforce Scheduling in Call Centers, San Diego,
Workshop of the Turkish and Israeli Operations Research Societies,
Co-Organizer of session Stochastic Modeling, Boğaziçi University,
İstanbul, September 2009.
Meeting of the EURO
Working Group on Stochastic Modeling, Koç University, İstanbul, June 2008,
Member of the Organizing Committee.
YA/EM Ulusal Kongresi
2005, Koç University, İstanbul, Member of the Organizing Committee.
EURO/INFORMS 2003 The Joint International Meeting, Organizer and chair of
session Internet and Wireless Networks, İstanbul, July 2003.
- INFORMS Doctoral Colloquium, New Orleans, November 1995.