Ger Koole | Vrije Universiteit Amsterdam (original) (raw)

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Papers by Ger Koole

KNAW Narcis. Back to search results. Publication De overval : Twee seconden is hier een eeuwighei... more KNAW Narcis. Back to search results. Publication De overval : Twee seconden is hier een eeuwigheid (2003). Pagina-navigatie: Main. Title, De overval : Twee seconden is hier een eeuwigheid. Published in, Nieuw Archief voor Wiskunde, Vol. 5/4, No. 3, p.224-. ...

... nl Leila Mohammadi Universiteit Leiden leila@ math. leidenuniv. nl Jaap Molenaar Technische U... more ... nl Leila Mohammadi Universiteit Leiden leila@ math. leidenuniv. nl Jaap Molenaar Technische Universiteit Eindhoven j. molenaar1@ tue. nl Jeroen Mulder KLM, Amstelveen jeroen. mulder@ klm. ... dlo. nl Nienke Valkhoff Universiteit van Amsterdam nienke@ science. uva. ...

KNAW Narcis. Back to search results. Publication De overval bij het Nederlands Forensisch Institu... more KNAW Narcis. Back to search results. Publication De overval bij het Nederlands Forensisch Instituut : waarheid met kans nul (2005). Pagina-navigatie: Main. ...

Care workers account for a significant proportion of the total health expenditure in nursing home... more Care workers account for a significant proportion of the total health expenditure in nursing homes and are by far the largest controllable resource. Therefore, determining the appropriate number and type of care workers required plays an important role in the search for more efficiency. This study provides insights into how and why ‘scale of scheduling’ and the enlargement of care workers’ jobs (blending tasks of different qualification levels (QLs)) affect the number and type of staff required to meet the preferences (in terms of day and time) of nursing home residents. The scheduling data for plannable care activities of three separate decision-making units within a single Dutch nursing home have been analyzed. The results show that in >85% of the examined cases, substantial scale and skillmix economies can be achieved. We also found that the correlation between the demand patterns of different types of care tasks is of considerable importance when it comes to possible scale and skill-mix efficiencies.

In this study, we analyze a task scheduling problem with small time windows and care workers with... more In this study, we analyze a task scheduling problem with small time windows and care workers with different levels of qualification in a nursing home. A set of care tasks has to be assigned to a given number of care workers, so that the total earliness and tardiness from the nursing home residents’ preferred time is minimized.

To optimally solve this scheduling problem, we formulate a mixed integer program (MIP) and develop a dynamic programming (DP) approach. The numerical analysis shows the reliability of this optimization approach as well as of a heuristic DP approach. A sensitivity analysis with real-world demand data shows the impact of hierarchical qualification levels and large-scale scheduling.