Papers by Bart Veltman
Cost-efficient staffing under annualized hours
We study how flexibility in workforce capacity can be used to effi-ciently match capacity and dem... more We study how flexibility in workforce capacity can be used to effi-ciently match capacity and demand. Flexibility in workforce capacity is introduced by the annualized hours regime. Annualized hours allow orga-nizations to measure working time per year, instead of per month or per week. An additional source of flexibility is hiring employees with differ-ent contract types, like full-time, part-time, and min-max, and by hiring subcontractors. We propose a mathematical programming formulation that incorpo-rates annualized hours and shows to be very flexible with regard to mod-eling various contract types. The objective of our model is to minimize salary cost, thereby covering workforce demand, and using annualized hours. Our model is able to address various business questions regard-ing tactical workforce planning problems, e.g., with regard to annual-ized hours, subcontracting, and vacation planning. In a case study for a Dutch hospital two of these business questions are addressed, ...
Jaarurenplanningen: schakel tussen formatiebegroting en dienstroostering
Capaciteitsplanning in de zorg, 2016
Jaarurenplanningen vormen een methodiek om het gat tussen de begroting van personeelsbudgetten en... more Jaarurenplanningen vormen een methodiek om het gat tussen de begroting van personeelsbudgetten en formatiesamenstelling en de operationele inzetplanning van personeel te dichten. Jaarurenplanningen beschrijven een planning op het niveau van weken tot maanden, waarin de inzet van personeel (in uren per week/maand) wordt afgestemd op een ingeschat productieniveau (een verwachte vraag naar zorg). Daarmee wordt voorkomen dat er momenten (weken) van onderbezetting zijn en, tegelijkertijd, momenten (andere weken) van overbezetting. Een aan twee kanten snijdend mes als het gaat om beheersing van kosten, maar ook als het gaat om kwaliteit van dienstverlening. Het laatste doordat er meer momenten zijn van een goed op de vraag naar zorg afgestemd aanbod aan zorgcapaciteit. Aan de hand van een aantal voorbeelden motiveren wij het nut van jaarurenplanningen en we presenteren, zonder op wiskundige details in te gaan, een rekenmodel om jaarurenplanningen te ondersteunen.
Health care management science, Jan 6, 2014
We propose a mathematical programming formulation that incorporates annualized hours and shows to... more We propose a mathematical programming formulation that incorporates annualized hours and shows to be very flexible with regard to modeling various contract types. The objective of our model is to minimize salary cost, thereby covering workforce demand, and using annualized hours. Our model is able to address various business questions regarding tactical workforce planning problems, e.g., with regard to annualized hours, subcontracting, and vacation planning. In a case study for a Dutch hospital two of these business questions are addressed, and we demonstrate that applying annualized hours potentially saves up to 5.2% in personnel wages annually.
Operations Research Letters, 1994
European Journal of Operational Research, 2008
In an attempt to ensure good-quality printouts of our technical reports, from the supplied PDF fi... more In an attempt to ensure good-quality printouts of our technical reports, from the supplied PDF files, we process to PDF using Acrobat Distiller. We encourage our authors to use outline fonts coupled with embedding of the used subset of all fonts (in either Truetype or Type 1 formats) except for the standard Acrobat typeface families of Times, Helvetica (Arial), Courier and Symbol. In the case of papers prepared using TEX or LATEX we endeavour to use subsetted Type 1 fonts, supplied by Y&Y Inc., for the Computer Modern, Lucida Bright and Mathtime families, rather than the public-domain Computer Modern bitmapped fonts. Note that the Y&Y font subsets are embedded under a site license issued by Y&Y Inc.
Parallel Computing, 1990
DOI to the publisher's website. • The final author version and the galley proof are versions of t... more DOI to the publisher's website. • The final author version and the galley proof are versions of the publication after peer review. • The final published version features the final layout of the paper including the volume, issue and page numbers. Link to publication General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights. • Users may download and print one copy of any publication from the public portal for the purpose of private study or research. • You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal. If the publication is distributed under the terms of Article 25fa of the Dutch Copyright Act, indicated by the "Taverne" license above, please follow below link for the End User Agreement:
Cost-efficient staffing under annualized hours
Shift rostering using decomposition: assign weekend shifts first
Puc, 2012
Shift rostering using decomposition: assign weekend shifts first
Cooperation in one machine scheduling
ZOR - Methods and Models of Operations Research, 1993
The Complexity of Scheduling Trees with Communication Delays
Journal of Algorithms, 1996
ORchestra: an online reference database of OR/MS literature in health care
Health Care Management Science, 2011
Preemptive scheduling in a two-stage multiprocessor flow shop is NP-hard
European Journal of Operational Research, 1996
Discrete Applied Mathematics, 1994
We investigate the computational complexity of scheduling multiprocessor tasks with prespecified ... more We investigate the computational complexity of scheduling multiprocessor tasks with prespecified processor allocations. We consider two criteria: minimizing schedule length and minimizing the sum of the task completion times. In addition, we investigate the complexity of problems when precedence constraints or release dates are involved. 1980 Mathematics SUbject Classification (1985 Revision):90835.
Rostering from staffing levels: a branch-and-price approach
International Journal of Parallel Programming, 2009
Many rostering methods first create shifts from some given staffing levels, and after that create... more Many rostering methods first create shifts from some given staffing levels, and after that create rosters from the set of created shifts. Although such a method has some nice properties, it also has some bad ones. In this paper we outline a method that creates rosters directly from staffing levels. We use a Branch-and-Price (B\&P) method to solve this rostering
European Journal of Operational Research, 2008
In an attempt to ensure good-quality printouts of our technical reports, from the supplied PDF fi... more In an attempt to ensure good-quality printouts of our technical reports, from the supplied PDF files, we process to PDF using Acrobat Distiller. We encourage our authors to use outline fonts coupled with embedding of the used subset of all fonts (in either Truetype or Type 1 formats) except for the standard Acrobat typeface families of Times, Helvetica (Arial), Courier and Symbol. In the case of papers prepared using TEX or LATEX we endeavour to use subsetted Type 1 fonts, supplied by Y&Y Inc., for the Computer Modern, Lucida Bright and Mathtime families, rather than the public-domain Computer Modern bitmapped fonts. Note that the Y&Y font subsets are embedded under a site license issued by Y&Y Inc. For further details of site licensing and purchase of these fonts visit
Thesis Chapters by Bart Veltman
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Papers by Bart Veltman
Thesis Chapters by Bart Veltman