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Kwakkel, M. (author), Gerritsma, M.I. (author)
In this work a new approach to time dependent problems in combination with the Least-Squares Spectral Element Method (LSQSEM) will be discussed. Various timestepping formulations will be presented. These time-stepping formulations will be compared to the full space-time formulation. It will be shown that time-stepping formulations give accurate...
conference paper 2006
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Slinger, J.H. (author), Kwakkel, J.H. (author), Van der Niet, M. (author)
In this paper we address the role of reflective skills in the development and training of new System Dynamics modelers at the tertiary education level. Over the last two years students at the Delft University of Technology have written a reflective essay on their experiences with the conceptualization, formulation, validation and use of a System...
conference paper 2008
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Kwakkel, G. (author), Meskers, C.G.M. (author), Van Wegen, E.E. (author), Lankhorst, G.J. (author), Geurts, A.C.H. (author), Van Kuijk, A.A. (author), Lindeman, E. (author), Visser-Meily, A. (author), Vlugt, E. (author), Arendzen, J.H. (author)
Main claims of the literature are that functional recovery of the paretic upper limb is mainly defined within the first month post stroke and that rehabilitation services should preferably be applied intensively and in a task-oriented way within this particular time window. EXplaining PLastICITy after stroke (acronym EXPLICIT-stroke) aims to...
journal article 2008
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Kwakkel, J.H. (author), Walker, W.E. (author), Marchau, V.A.W.J. (author)
Airport Strategic Planning (ASP) focuses on the development of plans for the long-term development of an airport. The dominant approach for ASP is Airport Master Planning (AMP). The goal of AMP is to provide a detailed blueprint for how the airport should look in the future, and how it can get there. Since a Master Plan is a static detailed...
journal article 2010
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Kwakkel, J.H. (author)
The treatment of uncertainty in the long-term planning of infrastructures in general and of mainports such as airports and seaports is a key challenge for decisionmakers. Moreover, these uncertainties have increased over the last decades due to changes in owner structure, changes in rules and regulations, and the ever increasing connectedness of...
doctoral thesis 2010
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Kwakkel, J.H. (author), Slinger, J.H. (author)
Coastal communities dependent upon groundwater resources for drinking water and irrigation are vulnerable to salinization of the groundwater reserve. The increasing uncertainty associated with changing climatic conditions, population and economic development, and technological advances in agriculture, water treatment, and water purification,...
conference paper 2011
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Pruyt, E. (author), Kwakkel, J.H. (author)
Radicalization and deradicalization are deeply uncertain dynamic processes. Exploring and analyzing many plausible futures and assessing the robustness of policies to reinforce desirable evolutions seem more useful for such processes than trying to predict their precise development over time and optimize the associated policy response. This...
conference paper 2011
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Pruyt, E. (author), Kwakkel, J. (author), Yucel, G. (author), Hamarat, C. (author)
This paper illustrates the use of Exploratory System Dynamics Modeling and Analysis – a multi-method combining System Dynamics and Exploratory Modeling and Analysis to explore and analyze uncertain dynamic issues and test deep policy robustness. This paper gives an overview of the current state of this multi-method by means of an illustration....
conference paper 2011
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Cunningham, S.W. (author), Kwakkel, J.H. (author)
This paper discusses capabilities for a systematic overview of world science delivered from the use of new output indicators of science and technology. The data may be usefully structured using a complex network perspective on national publication and international collaboration. This paper uses a random sample of publication data from 2009 to...
conference paper 2011
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Kwakkel, J.H. (author), Timmermans, J.S. (author)
conference paper 2012
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Haasnoot, M. (author), Kwakkel, J.H. (author), Walker, W.E. (author)
Water management in river deltas is increasingly being challenged by pressures from population growth, sea level rise, increasing variability in river runoffs, and potential climate change. Adaptation to such changes is not only determined by what is known or anticipated at present, but also by what will be experienced and learned as the future...
conference paper 2012
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Hamarat, C. (author), Kwakkel, J.H. (author), Pruyt, E. (author)
Uncertainty manifests itself in almost every aspect of decision making. Adaptive and flexible policy design becomes crucial under uncertainty. An adaptive policy is designed to be flexible and can be adapted over time to changing circumstances and unforeseeable surprises. A crucial part of an adaptive policy is the monitoring system and...
conference paper 2012
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Kwakkel, J.H. (author), Timmermans, J.S. (author)
In the Nature article ‘A safe operating space for humanity’, Rockström et al. (2009) introduce the concept of a safe operating space for humanity. A safe operating space is the space for human activities that will not push the planet out of the ‘Holocene state’ that has seen human civilizations arise, develop, and thrive. Rockström et al. have...
conference paper 2012
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Kwakkel, J.H. (author), Timmermans, J.S. (author)
Safe operating space for human activities that will not push the planet out of the ‘Holocene state’ that has seen human civilizations arise, develop, and thrive can be defined with respect to among others global freshwater use. Establishing such limits is a methodological challenge because they are critically depended on local conditions, the...
conference paper 2012
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Kwakkel, J.H. (author), Haasnoot, M. (author)
Sustainable water management in a changing environment full of uncertainty is a profound challenge. To deal with uncertainties, dynamic adaptive policies can be used. Such policies can change over time in response to how the future unfolds, to what we learn about the system, to changes in environment, and to changes in societal preferences. This...
conference paper 2012
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Keijser, B.M.J. (author), Kwakkel, J.H. (author), Pruyt, E. (author)
Formal Model Analysis (FMA) covers a group of methods and techniques to study structurebehaviour relations in best-estimate models. That is, FMA aims to identify the structural causes for the particular dynamics of a single best-estimate model. Under deep uncertainty, the notion of a best-estimate model is however troublesome. Then Exploratory...
conference paper 2012
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Hamarat, C. (author), Kwakkel, J.H. (author), Pruyt, E. (author)
The recent flu pandemic in 2009 caused a panic about the possible consequences due to deep uncertainty about an unknown virus. Overstock of vaccines or unnecessary social measures to be taken were all due to uncertainty. However, what should be the necessary actions to take in such deeply uncertain situation where there is no or very little...
conference paper 2012
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Pruyt, E. (author), Kwakkel, J.H. (author)
Integrated risk-capability analysis methodologies for dealing with increasing degrees of complexity and deep uncertainty are urgently needed in an ever more complex and uncertain world. Although scenario approaches, risk assessment methods, and capability analysis methods are used, few organizations and nations use truly integrated risk...
conference paper 2012
document
Kwakkel, J.H. (author), Slinger, J.H. (author)
Coastal communities dependent upon groundwater resources for drinking water and irrigation are vulnerable to salinization of the groundwater reserve. The increasing uncertainty associated with changing climatic conditions, population and economic development, and technological advances poses significant challenges for freshwater management. The...
conference paper 2012
document
Kwakkel, J.H. (author), Timmermans, J.S. (author)
Rockström et al. (2009) introduced the concept of a safe operating space for humanity that will not push the planet out of the ‘Holocene state’. These limits are being investigated for various earth bound systems. Estimates of these limits are plagued by uncertainty. In case of the limits to the world water system, these uncertainties arise out...
conference paper 2012
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