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Zatarain Salazar, J. (author), Kwakkel, J.H. (author), Witvliet, Mark (author)Evolutionary Multi-Objective Direct Policy Search (EMODPS) is a prominent framework for designing control policies in multi-purpose environmental systems, combining direct policy search with multi-objective evolutionary algorithms (MOEAs) to identify Pareto approximate control policies. While EMODPS is effective, the choice of functions...journal article 2024
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van Schilt, Isabelle M. (author), van Kalker, Jonna (author), Lefter, I. (author), Kwakkel, J.H. (author), Verbraeck, A. (author)Schedule design in the transportation and logistics sector is a widely studied problem. Transport service providers, such as the train industry and aviation, aim for schedules to be on-time according to the planning (i.e., on-time performance or OTP) in order to increase the service level by ensuring that passengers actually make their...journal article 2024
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van Droffelaar, I.S. (author), Kwakkel, J.H. (author), Mense, Jelte P. (author), Verbraeck, A. (author)Simulation–optimization models are well-suited for real-time decision-support to the control room for search and interception of fugitives by Police on a road network, due to their ability to encode complex behavior while still optimizing the interception. The typical simulation–optimization configuration is simulation model optimization,...journal article 2024
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Allison, A. E.F. (author), Lawrence, J. H. (author), Stephens, S. A. (author), Kwakkel, J.H. (author), Singh, S. K. (author), Blackett, P. (author), Stroombergen, A. (author)Infrastructure in low-lying coastal areas faces challenges from climate change, sea level rise, and the impact of compound hazards. Dynamic adaptive pathways planning (DAPP) is increasingly being applied as a way of planning under deep uncertainty. Stress testing for robustness is an integral part of DAPP which provides decision-makers with...journal article 2024
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van Schilt, Isabelle M. (author), Kwakkel, J.H. (author), Mense, Jelte P. (author), Verbraeck, A. (author)Supply chain visibility concerns the ability to track parts, components, or products in transit from supplier to customer. The data that organizations can obtain to establish or improve supply chain visibility is often sparse. This paper presents a classification of the dimensions of data sparseness and quantitatively explores the impact of...journal article 2024
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Bradley, J.E. (author), Auping, Willem L. (author), Kleijn, René (author), Kwakkel, J.H. (author), Sprecher, Benjamin (author)Tin is an important metal for society with a high risk of supply disruptions. It is, therefore, classified as a critical material in many parts of the world. An exception is the European Union, for which tin was classified as a non-critical material in 2023. However, there are many discrepancies in the literature regarding the definitions and...journal article 2024
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Moallemi, Enayat A. (author), Zare, Fateme (author), Hebinck, Aniek (author), Szetey, Katrina (author), Molina-Perez, Edmundo (author), Zyngier, Romy L. (author), Hadjikakou, Michalis (author), Kwakkel, J.H. (author), Haasnoot, Marjolijn (author)Decision-making under uncertainty is important for managing human-natural systems in a changing world. A major source of uncertainty is linked to the multi-actor settings of decisions with poorly understood values, complex relationships, and conflicting management approaches. Despite general agreement across disciplines on co-producing knowledge...journal article 2023
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Mannucci, Simona (author), Kwakkel, J.H. (author), Morganti, Michele (author), Ferrero, Marco (author)Cities play a critical role in developing adaptable strategies to address the challenges posed by climate change. However, the inherent complexity of urban environments and their uncertain future conditions necessitate exploring innovative approaches and tools to assist the current planning practices. This paper presents a workflow rooted in...journal article 2023
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Zatarain Salazar, J. (author), Kwakkel, J.H. (author), Witvliet, Mark (author)Efficient multi-purpose reservoir control policies are crucial in the face of frequent and severe floods and droughts, and to balance water allocation across conflicting demands. Evolutionary Multi-Objective Direct Policy Search (EMODPS) is a popular approach to design control policies for multi-purpose reservoir systems. EMODPS, however, relies...journal article 2022
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Yalew, S.G. (author), Kwakkel, J.H. (author), Zatarain Salazar, J. (author), Doorn, N. (author)Justice in the allocation and distribution of water is one of the most recent topics in the water resources management literature. This topic, i.e., justice/equity/fairness, is especially noteworthy in integrated water resources management where competing needs, sectors, and societal segments are involved in the utilization of water. Although...abstract 2022
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van der Cruijsen, J. (author), Dooren, R.F. (author), Schouten, A.C. (author), Oostendorp, Thom F. (author), Frens, Maarten A. (author), Ribbers, G.M. (author), van der Helm, F.C.T. (author), Kwakkel, Gert (author), Selles, R.W. (author)Transcranial direct current stimulation (tDCS) is a promising tool to improve and speed up motor rehabilitation after stroke, but inconsistent clinical effects refrain tDCS from clinical implementation. Therefore, this study aimed to assess the need for individualized tDCS configurations in stroke, considering interindividual variability in...journal article 2022
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Teodoro Morales, J.D. (author), Doorn, N. (author), Kwakkel, J.H. (author), Comes, M. (author)To adapt to a changing climate, decision-makers design, evaluate, and implement measures that have an implication of justice on citizens in the present and well into the future. Decision-makers are often required to make decisions without certainty of the consequences and understanding their effects on intergenerational justice. Thus, managing...journal article 2022
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Ciullo, A. (author), Domeneghetti, A. (author), Kwakkel, J.H. (author), De Bruijn, K. M. (author), Klijn, F. (author), Castellarin, A. (author)Robust Decision Making (RDM) is an established framework for decision making under deep uncertainty. RDM relies on the idea of scenario neutrality, namely that decision robustness is not affected by how scenarios are generated if these are uniformly distributed and span a sufficiently large range of future states of the world. Several authors...journal article 2022
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Enserink, B. (author), Bots, P.W.G. (author), van Daalen, C. (author), Hermans, L.M. (author), Kortmann, Rens (author), Koppenjan, Joop (author), Kwakkel, J.H. (author), Ruijgh-van der Ploeg, M.P.M. (author), Slinger, J (author), Thissen, W.A.H. (author)Policy of Multi-Actor Systems is an introduction into the art of craft of problem exploration and problem structuring. It positions policy analysis as a scientific discipline focused on systems analysis in a multi-actor context to support better informed decision-making. The approach presented in this book is considered to be the cornerstone of...book 2022
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Steffelbauer, D.B. (author), Riva, R.E.M. (author), Timmermans, Jos (author), Kwakkel, J.H. (author), Bakker, M. (author)Global mean sea-level rise (SLR) has accelerated since 1900 from less than 2 mm yr-1 during most of the century to more than 3 mm yr-1 since 1993. Decision-makers in coastal countries, however, require information on SLR at the regional scale, where detection of an acceleration in SLR is difficult, because the long-term sea-level signal is...journal article 2022
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Scholte, Mirre (author), Marchau, V.A.W.J. (author), Kwakkel, J.H. (author), Klijn, Catharina J.M. (author), Rovers, Maroeska M. (author), Grutters, Janneke P.C. (author)Objectives: In early stages, the consequences of innovations are often unknown or deeply uncertain, which complicates early health economic modeling (EHEM). The field of decision making under deep uncertainty uses exploratory modeling (EM) in situations when the system model, input probabilities/distributions, and consequences are unknown or...journal article 2022
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Moallemi, Enayat A. (author), Eker, Sibel (author), Gao, Lei (author), Hadjikakou, Michalis (author), Liu, Qi (author), Kwakkel, J.H. (author), Reed, Patrick M. (author), Obersteiner, Michael (author), Guo, Zhaoxia (author), Bryan, Brett A. (author)Progress to date toward the Sustainable Development Goals (SDGs) has fallen short of expectations and is unlikely to fully meet 2030 targets. Past assessments have mostly focused on short- and medium-term evaluations, thus limiting the ability to explore the longer-term effects of systemic interactions with time lags and delay. Here we undertake...journal article 2022
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Jafino, B.A. (author), Kwakkel, J.H. (author), Klijn, F. (author)To support equitable adaptation planning, quantitative assessments should consider the fairness of the distribution of outcomes to different people. What constitutes a fair distribution, however, is a normative question. In this study, we explore the use of different moral principles drawn from theories of distributive justice to evaluate...journal article 2022
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van Schilt, Isabelle M. (author), Kwakkel, J.H. (author), Mense, Jelte P. (author), Verbraeck, A. (author)COVID-19 related crimes like counterfeit Personal Protective Equipment (PPE) involve complex supply chains with partly unobservable behavior and sparse data, making it challenging to construct a reliable simulation model. Model calibration can help with this, as it is the process of tuning and estimating the model parameters with observed data...conference paper 2022
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Oehmen, Josef (author), Kwakkel, J.H. (author)Uncertainty is the third major perspective in understanding and designing engineering systems, along with complexity and human behaviour. Risk, a corollary of uncertainty, is understood as the effect of uncertainty on objectives. When designing engineering systems, you cannot not manage risk - even ignoring risk equates to a decision to accept...book chapter 2022