• A closer view at the patient surgery planning and scheduling problem: A literature review

      Samudra, Michael; Demeulemeester, Erik; Cardoen, Brecht (2013)
    • A decision support system for cyclic master surgery scheduling with multiple objectives

      Beliën, Jeroen; Demeulemeester, Erik; Cardoen, Brecht (2009)
    • An efficient solution method to design the cost-minimizing platform portfolio

      Van den Broeke, Maud; Boute, Robert; Cardoen, Brecht; Samii, Behzad (2017)
      To offer a wide product variety to customers in a cost-efficient way, companies have introduced platforms, defined as a base from which different products can be derived. We consider a product portfolio, consisting of a set of end products, where each product has a set of attributes (features), which can have different levels requested by the customers. We present a model to support companies in designing the cost-minimizing platform portfolio, consisting of a set of platforms, from which these products can be derived. Each platform has a set of technical design parameters, which can have different levels. The required parameter levels in the platform's design depend on the attribute needs of the products derived from the platform. Our model gives guidance to what extent the platforms should be under-designed, over-designed or the same with regard to the products (and its attribute levels) derived from them. The model quantifies the impact of these platform portfolio decisions on the relevant operational costs. Given the complexity of this problem for large-scale instances, we develop two fathoming rules to improve computational efficiency. These fathoming rules can be used in different solution algorithms. We illustrate their applicability in a branch-and-bound, simulated annealing and genetic algorithm. We demonstrate the value of our model and solution method with a practical case of a high-tech screen manufacturing company, that wants to design the cost-minimizing platform portfolio from which their product portfolio can be derived.
    • Belang van traceability in de zorgsector

      Van Steendam, Tom; Cardoen, Brecht (2013)
    • Breaking down the silo of the hospital pharmacy

      Robberecht, Rein; Cardoen, Brecht; Gemmel, Paul (2014)
    • Breaking Silos: A Field Experiment on Relational Conflict Management in Cross-Functional Teams

      Boros, Smaranda; Van Gorp, Lore; Cardoen, Brecht; Boute, Robert (2017)
      In this paper we investigate how effective conflict management in conflict asymmetry situations impacts the quality of cross-functional management teams' performance. During a 5-day business simulation, we explore the consequences of the relational conflicts and conflict asymmetry experienced by team members. We use two different measures of conflict asymmetry: the traditional group conflict asymmetry measurement of Jehn (Adm Sci Q 40:256-282, 1995) and a social networks method. We find that when some team members evoke more conflict than others, this affects the evolution of team dynamics (and ultimately the performance of the team) even more than high levels of conflict altogether, however, group emotional awareness can mitigate this negative effect and improve the team performance through the appropriate use of conflict management strategies. Since group emotional awareness can be fostered and trained within teams, this is of practical value to improve the performance of cross-functional management teams.
    • Clinical pathways and operations management: it takes two to tango

      Demeulemeester, Erik; Sermeus, Walter; Beliën, Jeroen; Cardoen, Brecht (2007)
    • De onthaalomgeving vanuit een service-operations perspectief

      Cardoen, Brecht; Gemmel, Paul; Robberecht, Rein (2013)
    • Due time driven surgery scheduling

      Samudra, Michael; Demeulemeester, Erik; Cardoen, Brecht; Vansteenkiste, N.; Rademakers, Frank (2017)
      In many hospitals there are patients who receive surgery later than what is medically indicated. In one of Europe's largest hospitals, the University Hospital Leuven, this is the case for approximately every third patient. Serving patients late cannot always be avoided as a highly utilized OR department will sometimes suffer capacity shortage, occasionally leading to unavoidable delays in patient care. Nevertheless, serving patients late is a problem as it exposes them to an increased health risk and hence should be avoided whenever possible. In order to improve the current situation, the delay in patient scheduling had to be quantified and the responsible mechanism, the scheduling process, had to be better understood. Drawing from this understanding, we implemented and tested realistic patient scheduling methods in a discrete event simulation model. We found that it is important to model non-elective arrivals and to include elective rescheduling decisions made on surgery day itself. Rescheduling ensures that OR related performance measures, such as overtime, will only loosely depend on the chosen patient scheduling method. We also found that capacity considerations should guide actions performed before the surgery day such as patient scheduling and patient replanning. This is the case as those scheduling strategies that ensure that OR capacity is efficiently used will also result in a high number of patients served within their medically indicated time limit. An efficient use of OR capacity can be achieved, for instance, by serving patients first come, first served. As applying first come, first served might not always be possible in a real setting, we found it is important to allow for patient replanning.
    • Het operatiekwartier als motor van het ziekenhuis

      Demeulemeester, Erik; Cardoen, Brecht; Beliën, Jeroen (2006)
    • Improving workforce scheduling of aircraft line maintenance at Sabena Technics

      Beliën, Jeroen; Demeulemeester, Erik; Cardoen, Brecht (2012)
    • Integrated staffing and scheduling for an aircraft line maintenance problem

      Beliën, Jeroen; Demeulemeester, Erik; De Bruecker, Philippe; Van den Bergh, Jorne; Cardoen, Brecht (2013)
    • Lean in healthcare - Breaking the trade-off between service and efficiency

      Cardoen, Brecht; Gemmel, Paul; Robberecht, Rein (2012)
      Against the background of the current ‘technology goes economic market’ focus of mainstream innovation research, this editorial introduces contributions to a special issue explicitly devoted to the corresponding research gap: non-technological and non-economic innovations are indeed hardly explored, even approaches focussing on non-technological or social innovations still have a strong bias towards the economy. In contrast to both the mainstream and these alternative approaches to innovation, the editorial outlines a concept of socially robust innovations, i.e., innovations that have impact on both economic and non-economic spheres of society, and that can therefore be supposed to be more profitable in terms of, again, both economic and non-economic profit.
    • On the Design of Custom Packs: Grouping of Medical Disposable Items for Surgeries

      Cardoen, Brecht; Beliën, Jeroen; Vanhoucke, Mario (2015)
      A custom pack combines medical disposable items into a single sterile package that is used for surgical procedures. Although custom packs are gaining importance in hospitals due to their potential benefits in reducing surgery setup times, little is known on methodologies to configure them, especially if the number of medical items, procedure types and surgeons is large. In this paper, we propose a mathematical programming approach to guide hospitals in developing or reconfiguring their custom packs. In particular, we are interested in minimising points of touch, which we define as a measure for physical contact between staff and medical materials. Starting from an integer non-linear programming model, we develop both an exact linear programming (LP) solution approach and an LP-based heuristic. Next, we also describe a simulated annealing approach to benchmark the mathematical programming methods. A computational experiment, based on real data of a medium-sized Belgian hospital, compares the optimised results with the performance of the hospital's current configuration settings and indicates how to improve future usage. Next to this base case, we introduce scenarios in which we examine to what extent the results are sensitive for waste, i.e. adding more items to the custom pack than is technically required for some of the custom pack's procedures, since this can increase its applicability towards other procedures. We point at some interesting insights that can be taken up by the hospital management to guide the configuration and accompanying negotiation processes.
    • On the use of planning models in the operating theatre: Results of a survey in Flanders

      Cardoen, Brecht; Demeulemeester, Erik; Van der Hoeven, J. (2010)
    • Operating room planning and scheduling problems: a classification scheme

      Cardoen, Brecht; Demeulemeester, Erik; Beliën, Jeroen (2010)
    • Operating room planning and scheduling: A literature review

      Cardoen, Brecht; Demeulemeester, Erik; Beliën, Jeroen (2010)