Erwin Hans

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(2012-) Promoter of Renske Visser (in collaboration with NKI, prof.dr. W. van Harten)

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(2009-) Assistant promoter of Egbert van der Veen (ORTEC bv.)

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(2008-) Assistant promoter of Peter Hulshof (STW LogiDOC project)

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(2007-2011) Assistant promoter of Peter Vanberkel (STW LogiDOC project)

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(2004-) Ongoing research “OR/OM in healthcare”; subjects: Operating room/Intensive care planning and scheduling, planning concepts, simulation, emergency planning and scheduling, master surgical scheduling, robust surgery loading, …

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(2004-) Assistant promoter of ir. Jasper van Sambeek, subject: process optimization in the Radiology department at the AMC (academic medical centre in Amsterdam)

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(2004-) Project group member of NFU project concerning the benchmarking of the operating theatres of the 8 Dutch academic medical centres

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(2001-2005) Assistant promoter of dr.ir. Gerhard Wullink, subject: Resource Loading Under Uncertainty

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(2002-2003) REPRO: research project concerning productivity optimization in ship repair yards

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(1997-2001) Ph.D. project: "Resource Loading by Branch-and-Price Techniques"

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Van der Veen, E. Hans, E.W., Post, G.F., Veltman, B. (2012) Shift rostering using decomposition: assign weekend shifts first. Memorandum 1974, Department of Applied Mathematics, University of Twente, Enschede. ISSN 1874-4850

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Hulshof, P.J.H., Boucherie, R.J., Van Essen, J.T., Hans, E.W., Hurink, J.L., Kortbeek, N., Litvak, N., Vanberkel, P.T., Van der Veen, E., Veltman, B., ORchestra: an online reference database of OR/MS literature in health care. Health Care Management Science, 14(4), pp. 383-384.

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Hans E.W., Vanberkel, P.T. (2011) Operating Theatre Planning and Scheduling. In: Handbook of Health Care Systems Scheduling. Hall, Randolph (Ed.). Springer International Series in Operations Research & Management Science, Vol. 168. ISBN 978-1-4614-1733-0. Chapter 5.

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Hans E.W., Van Houdenhoven M., Hulshof P.J.H. (2011) A framework for health care planning and control. In: Handbook of Health Care Systems Scheduling. Hall, Randolph (Ed.). Springer International Series in Operations Research & Management Science, Vol. 168. ISBN 978-1-4614-1733-0. Chapter 12.

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Masmoudi M., Hans E.W., Haït A., Fuzzy tactical project planning: Application to helicopter maintenance. Paper submitted to the 16th IEEE International Conference on Emerging Technologies and Factory Automation (ETFA 2011).

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Hans E.W., Van Houdenhoven M., Hulshof P.J.H. (2011) A framework for health care planning and control. Memorandum 1938, Department of Applied Mathematics, University of Twente, Enschede. ISSN 1874-4850 (ePrint)

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Vanberkel P.T., Boucherie R.J., Hans E.W., Hurink J.L. (2011) Optimizing the Strategic Patient Mix. Memorandum 1935, Department of Applied Mathematics, University of Twente, Enschede. ISSN 1874-4850 (ePrint)

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Vanberkel P.T., Boucherie R.J., Hans E.W., Hurink J.L., Litvak N. (2011) Efficiency evaluation for pooling resources in health care. Accepted for publication in: OR Spectrum (Online First, poster, slides)

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Vanberkel, P.T., Boucherie, R.J., Hans, E.W., Hurink, J.L., Van Lent, W.A.M., Van Harten, W.H (2011) Accounting for Inpatient Wards when developing Master Surgical Schedules, Anesthesia and Analgesia 112(6):1472-1479, 2011

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Vanberkel P.T., Boucherie R.J., Hans E.W., Hurink J.L., Litvak N. (2010) A Survey of Health Care Models that Encompass Multiple Departments, International Journal of Health Management and Information, 1 (1) pp. 37 – 69 (ePrint, slides, summary)

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Hans E.W., Van de Velde S.L. (2011), The Lot Sizing and Scheduling of Sand Casting Operations, International Journal of Production Research 49 (9), pp. 2481-2499.

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Van Harten, W.H., Hans, E.W., Van Lent, W.A.M. (2010), Aanpak efficiency te ondoordacht (in Dutch), in: Medisch Contact 6, pp. 264-267.

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Vanberkel, P.T., Hans, E.W. (2009) Holistic healthcare modeling. A viewpoint on managing the complete patient care chain. Book contribution: Operational Research Applied to Health Services in Action, ISBN 978-83-7493-409-1, publisher: Oficyna Wydawnicza Politechniki Wrocławskiej (ePrint).

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Vanberkel, P.T., Boucherie, R.J., Hans, E.W., Hurink, J.L., Van Lent, W.A.M., Van Harten, W.H. (2011) An exact approach for relating recovering surgical patient workload to the master surgical schedule. Journal of the OR Society 62:1851-1860. Memorandum 1908, Department of Applied Mathematics, University of Twente, Enschede. ISSN 1874-4850 (ePrint)

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Vanberkel P.T., Boucherie R.J., Hans E.W., Hurink J.L., Litvak N. (2009) Designing for Economies of Scale vs. Economies of Focus in Hospital Departments, In: Proceedings of Innovation in Design and Management of Healthcare Facilities and Healthy Environments Research Day, Rotterdam, The Netherlands (2009) (paper)

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Vanberkel P.T., Boucherie R.J., Hans E.W., Hurink J.L., Litvak N., Van Lent W.A.M., Van Harten W.H. (2009) Reallocating Resources to Focused Factories: A Case Study in Chemotherapy, International Perspectives on Operations Research and Health Care: Proceedings of the European Working Group on Operational Research Applied to Health Services. Edited by J. Blake and M. Carter. (ISBN 978-0-9866179-0-4) ORAHS Toronto, Canada (ePrint, BETA working paper 259, slides)

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Kok, A.L., Hans, E.W., Schutten, J.M.J. (2011). Optimizing Departure Times in Vehicle Routes, in: European Journal of Operational Research 210(3): 579-587, and in: Beta working paper 236.

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Kok A.L., Hans E.W., Schutten J.M.J., Zijm W.H.M. (2010). A Dynamic Programming Heuristic for Vehicle Routing with Time-Dependent Travel Times and Required Breaks. Flexible Services and Manufacturing Journal, 22:83-108, 2010.

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T.S. Sibma, J. Klaase, S. Siesling, E.W. Hans, J.M. Hummel, M.J. IJzerman (2008), Cost-effectiveness and preference for follow-up scenarios following breast-cancer, in: Value in Health 11(6), 489-490, 2008.

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A.L. Kok, E.W. Hans, J.M.J. Schutten, Vehicle routing under time-dependent travel times: the impact of congestion avoidance, to appear in Computers & Operations Research, and: BETA working paper 267, 2008.

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J.M. van Oostrum, E. Bredenhoff, E.W. Hans, Managerial implications and suitability of a Master Surgical Scheduling approach, in: Annals of OR 178(1), 91-104, 2010.

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P.T. Vanberkel, R.J. Boucherie, E.W. Hans, J.L. Hurink, N. Litvak, W.A.M. van Lent, W.H. van Harten. Reallocating Resources to Focused Factories: A Case Study in Chemotherapy. BETA Working paper 259, 2008.

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J.J. van Elteren, E.W. Hans, S. Siesling, L.L.M. van der Wegen, N. Litvak, M.J. IJzerman, J.M. Klaase, Individualised breast cancer follow-up: a simulation study to optimise the number of hospital visits, submitted for publication, 2008.

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M. Van Houdenhoven, J.M. van Oostrum, G. Wullink, E.W. Hans, J.L. Hurink, J. Bakker, G. Kazemier, Fewer intensive care unit refusals and a higher capacity utilization by using a cyclic surgical case schedule, in: Journal of Critical Care 23, 222-226, 2008 (ePrint).

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G. Wullink, M. Van Houdenhoven, E.W. Hans, J.M. van Oostrum, M. van der Lans, G. Kazemier, Closing emergency operating rooms improves efficiency, in: Journal of Medical Systems 31(6), pp. 543-546, 2007.

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M. Van Houdenhoven, E.W. Hans, J. Klein, P. van der Maas, G. Wullink, G. Kazemier, A Norm Utilisation For Scarce Hospital Resources: Evidence from Operating Rooms in a Dutch University Hospital, Journal of Medical Systems 31(4), pp. 231-236, 2007.

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A.F. van Hoorn, M. van Houdenhoven, G. Wullink, E.W. Hans, G. Kazemier, Een duurzaam stappenplan voor benchmarking (in Dutch), Controlling, Nr. 3, maart 2007.

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E.W. Hans, T. Nieberg, J. van Oostrum, Optimization in Surgery Planning, in: MET Volume 15(1), pp. 20-28, 2007.

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M. Van Houdenhoven, J.M. van Oostrum, E.W. Hans, G. Wullink, G. Kazemier, Improving OR efficiency by applying bin packing and portfolio techniques to surgical case scheduling. Anesthesia & Analgesia 105(3), 2007.

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E.W. Hans, R. Leus, G. Wullink, W. Herroelen, A hierarchical approach to multi-project planning under uncertainty, in: OMEGA, International Journal Of Management Science, vol. 35, no. 5, pp. 563-577, 2007.

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J.M. van Oostrum, M. Van Houdenhoven, G. Wullink, E.W. Hans, G. Kazemier, Hoge OK benutting en minder afgevallen patienten door cyclisch plannen (in Dutch), in: 'Benchmarking OK - Leren van elkaar', edited by M. Van Houdenhoven, A.F. van Hoorn, C.J. Kalkman and G. Kazemier, Springer, Baarn/Leusden, pp. 113-120, 2006. (ePrint)

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M. van de Pol, M. Van Houdenhoven, G. Wullink, E.W. Hans, G. Kazemier, Geïntegreerde OK-IC planning zorgt voor hogere OK-benutting en minder afgevallen patienten (in Dutch), in: 'Benchmarking OK - Leren van elkaar', edited by M. Van Houdenhoven, A.F. van Hoorn, C.J. Kalkman and G. Kazemier, Springer, Baarn/Leusden, pp. 127-136, 2006. (ePrint)

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J. van Oostrum, M. van der Lans, M. Van Houdenhoven, E.W. Hans, G. Wullink, G. Kazemier, Wachttijdverkorting voor spoedpatienten door schuiven met de planning van electieve operaties (in Dutch), in: 'Benchmarking OK - Leren van elkaar', edited by M. Van Houdenhoven, A.F. van Hoorn, C.J. Kalkman and G. Kazemier, Springer, Baarn/Leusden, pp. 147-154, 2006. (ePrint)

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G. Wullink, M. van der Lans, M. Van Houdenhoven, E.W. Hans, G. Kazemier, Eén spoed-OK is geen spoed OK (in Dutch), in: 'Benchmarking OK - Leren van elkaar', edited by M. Van Houdenhoven, A.F. van Hoorn, C.J. Kalkman and G. Kazemier, Springer, Baarn/Leusden, pp. 165-172, 2006. (ePrint)

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M. Van Houdenhoven, E.W. Hans, A.F. van Hoorn, N. Pullen, R. van Barneveld, H. Krijgsman, F. Boer, G. Kazemier, Eenduidige tijdsregistratie operatiekamers (in Dutch), in: 'Benchmarking OK - Leren van elkaar', edited by M. Van Houdenhoven, A.F. van Hoorn, C.J. Kalkman and G. Kazemier, Springer, Baarn/Leusden, pp. 173-177, 2006.

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G. Wullink, M. Van Houdenhoven, M. Vrielink, J. Klein, E.W. Hans, M. Klimek, J.M. van Oostrum, E. Steyerberg, G. Kazemier, Veilig de nacht door! Efficiënter plannen zorgt voor minder kosten en grotere beschikbaarheid (in Dutch), in: 'Benchmarking OK - Leren van elkaar', edited by M. Van Houdenhoven, A.F. van Hoorn, C.J. Kalkman and G. Kazemier, Springer, Baarn/Leusden, pp. 137-142, 2006.

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E.W. Hans, T. Nieberg, Operating Room Manager Game, in: INFORMS Transactions on Education 8(1), September 2007.

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J.M. van Oostrum, M. Van Houdenhoven, J.L. Hurink, E.W. Hans, G. Wullink, G. Kazemier, A Master Surgical Scheduling approach for cyclic scheduling in operating room departments, in: OR Spectrum, 30(2), pp. 355-374, 2008. (ePrint)

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M. van der Lans, E.W. Hans, M. van Houdenhoven, J.L. Hurink, G. Wullink, Anticipating Urgent Surgery in Operating Room Departments, BETA working paper WP-158, ISSN: 1386-9213, University of Twente, 2006. (ePrint)

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A.F. van Hoorn, M. van Houdenhoven, G. Wullink, E.W. Hans, G. Kazemier, Een nieuw stappenplan voor benchmarking (in Dutch), Management Executive, November/December 2006. Also appeared in: Sigma.

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J.M. van Oostrum, M. Van Houdenhoven, M.M.J. Vrielink, J. Klein, E.W. Hans, M. Klimek, G. Wullink, E.W. Steyerberg, G. Kazemier, A Simulation Model for Determining the Optimal Size of Emergency Teams on Call in the Operating Room at Night, in: Anesthesia Analgesia 107(5), pp. 1655-62, 2008.

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M. Van Houdenhoven, E.W. Hans, A.F. Van Hoorn, N. Pullen, R. Van Barneveld, H. Krijgsman, F. Boer, G. Kazemier, Eenduidige tijdregistratie operatiekamers - Definitiesysteem maakt onderlinge vergelijking mogelijk, in: Medisch Contact 61(2), January 13, 2006.

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M.A. van de Pol, M. Van Houdenhoven, E.W. Hans, E. Boersma, J.J. Bax, H.H. Feringa, O. Schouten, R.H.M. Van Sambeek, D. Poldermans, Influence of Cardiac Risk Factors and Medication on Length of Hospitalization for Patients Undergoing Major Vascular Surgery, in: American Journal of Cardiology 97(10), pp. 1423-6, May 15, 2006. Epub Mar 23, 2006.

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J.M. van Oostrum, M. Van Houdenhoven, E.W. Hans, G. Wullink, G. Kazemier, Sequencing surgical procedures to minimize emergency waiting time, working paper, Erasmus MC, 2006.

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S.G. Elkhuizen, J.R.C. van Sambeek, E.W. Hans, J.J. Krabbendam, P.J.M. Bakker, Applying the Variety Reduction Principle to management of ancillary services, Health Care Management Review, vol. 32, no. 1, pp. 37-45, 2006.

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E.W. Hans, G. Wullink, M. van Houdenhoven, G. Kazemier, Robust Surgery Loading, in: European Journal of Operational Research 185, pp. 1038-1050, 2008.

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G. Wullink, E.W. Hans, A. van Harten, Robust Resource Loading for Engineer-To-Order manufacturing, BETA-publication, ISSN: 1386-9213, WP-123, 2004. Submitted to: OR Spectrum.

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G. Wullink, A.J.R.M. Gademann, E.W. Hans, A. van Harten, Scenario-based approach for flexible resource loading under uncertainty, Int. Journal of Production Research, vol. 42, no. 24, pp. 5079-5098, 2004.

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M.J.R. Ebben, E.W. Hans, F.M. Olde Weghuis, Workload based order acceptance in job shop environments, in: OR Spectrum, Vol. 27, No. 1, pp. 107-122, 2005.

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E.W. Hans, Resource loading by branch-and-price techniques, Ph.D. thesis, University of Twente, 2001.

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E.W. Hans, Resource loading by branch-and-price techniques: models and algorithms, BETA-publication, ISSN 1386-9213; WP 87.

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E.W. Hans, Make-to-order planning vereist flexibiliteit, in: IT Logistiek, April 2003.

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M.F. van Assen, E.W. Hans, S.L. van de Velde, An Agile Planning & Control Framework for Customer-Order Driven Discrete Parts Manufacturing Environments, in: International Journal of Agile Management Systems, Vol. 2, No. 1, pp. 16-23, 2000.

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M.M.T. Giebels, E.W. Hans, M.P.H. Gerritsen, H.J.J. Kals, Capacity planning for make- or engineer-to-order manufacturing; the importance of order classification, conference proceedings of the 33rd CIRP International Seminar on Manufacturing Systems, Sweden, 2000.

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M.F. van Assen, E.W. Hans, S.L. van de Velde, A time-based planning & control framework for discrete parts manufacturing environments, Erasmus Management report series; no. 35-1998.

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S.L. van de Velde, E.W. Hans, Production Planning and Scheduling of a Cast-To-Stock Metal Foundry, Erasmus Management report series; no. 37-1998.

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E.W. Hans, ELMA- model of a liberalized electricity market, in ECN reports ECN-I-97-028, 1997 (graduation thesis).