Searched for: subject:"Variability"
(1 - 20 of 164)

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Hunnekens, Bram (author), Kamps, Sjors (author), van de Wouw, N. (author)
In this paper, we introduce a variable-gain control strategy for mechanical ventilators in the respiratory systems. Respiratory systems assist the patients who have difficulty breathing on their own. For the comfort of the patient, fast pressure buildup (and release) and a stable flow response are desired. However, linear controllers...
journal article 2018
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Digna, R.F.M.O. (author), Castro Gama, M.E. (author), van der Zaag, P. (author), Mohamed, Yasir A. (author), Corzo, Gerald (author), Uhlenbrook, S. (author)
The Eastern Nile Basin is facing a number of transboundary issues, including water resources development, and the associated impacts. The Nile Basin, particularly the Eastern Nile Sub-basin, is considered as one of a few international river systems of potential conflicts between riparian countries. The Eastern Nile is characterized by the...
journal article 2018
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Toodesh, R. (author), Verhagen, A.A. (author)
The spatial sampling often used to process and represent bathymetric data are of fixed grid resolution where the least depth value is stored in each grid cell. This results in Digital Elevation Models (DEMs) that are used to depict the underlying features of the seafloor. With the discretion of the user, the resulting DEMs used may either be...
journal article 2018
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Radermacher, M. (author), de Schipper, M.A. (author), Price, Timothy (author), Huisman, B.J.A. (author), Aarninkhof, S.G.J. (author), Reniers, A.J.H.M. (author)
The behaviour of subtidal sandbars can be strongly influenced by the introduction of sand nourishments in the coastal system. This study focuses on the impact of nourishments on subtidal bar behaviour at spatio-temporal scales beyond a single nourishment project. It aims to determine the long-term behaviour of subtidal sandbars along an entire...
journal article 2018
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Peeters, D.M.J. (author), Lozano, Gustavo Gonzalez (author), Abdalla, M.M. (author)
A method to optimise the fibre angle distribution of variable stiffness laminates is proposed. The proposed method integrates a fibre angle retrieval step with a fibre angle optimisation procedure. A multi-level approximation approach is used in combination with the method of successive approximations. First, fibre angle retrieval is done by...
journal article 2018
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van Westen, René M. (author), Dijkstra, Henk A. (author), Klees, R. (author), Riva, R.E.M. (author), Slobbe, D.C. (author), van der Boog, C.G. (author), Katsman, C.A. (author), Candy, A.S. (author), Pietrzak, J.D. (author), Zijlema, M. (author), James, Rebecca K. (author), Bouma, Tjeerd J. (author)
The Yucatan Channel connects the Caribbean Sea with the Gulf of Mexico and is the main outflow region of the Caribbean Sea. Moorings in the Yucatan Channel show high-frequent variability in kinetic energy (50–100 days) and transport (20–40 days), but the physical mechanisms controlling this variability are poorly understood. In this study, we...
journal article 2018
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Prendergast, L.J. (author), Reale, C. (author), Gavin, K. (author)
The trend for development in the offshore wind sector is towards larger turbines in deeper water. This results in higher wind and wave loads on these dynamically sensitive structures. Monopiles are the preferred foundation solution for offshore wind structures and have a typical expected design life of 20 years. These foundations have strict...
journal article 2018
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Peeters, D.M.J. (author), Hong, Z. (author), Abdalla, M.M. (author)
A way to approximate the compliance of composites for optimisation is described. A two-level approximation scheme is proposed inspired by traditional approximation concepts such as force approximations and convex linearisation. In level one, an approximation in terms of the reciprocal in-plane stiffness matrix is made. In level two, either...
journal article 2018
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Dominguez Frejo, J.R. (author), Papamichail, Ioannis (author), Papageorgiou, Markos (author), De Schutter, B.H.K. (author)
This paper proposes a new macroscopic model for Variable Speed Limits (VSLs), combining characteristics of previously proposed models, in order to have the capability of modeling different capacities, critical densities, and levels of compliance for links affected by speed limits. Moreover, the effects of VSLs on the fundamental diagram of...
conference paper 2018
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van de Weg, G.S. (author), Hegyi, A. (author), Hoogendoorn, S.P. (author), De Schutter, B.H.K. (author)
Freeway congestion can reduce the freeway throughput due to the capacity drop or due to blocking caused by spillback to upstream ramps. Research has shown that congestion can be reduced by the application of ramp metering and variable speed limits. Model predictive control is a promising strategy for the optimization of the ramp metering...
journal article 2018
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Alibekov, Eduard (author), Kubalik, Jiri (author), Babuska, R. (author)
This paper addresses the problem of deriving a policy from the value function in the context of critic-only reinforcement learning (RL) in continuous state and action spaces. With continuous-valued states, RL algorithms have to rely on a numerical approximator to represent the value function. Numerical approximation due to its nature virtually...
journal article 2018
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van Engelenburg, S.H. (author), Janssen, M.F.W.H.A. (author), Klievink, A.J. (author)
Context-awareness refers to the ability to sense and adapt to context. With the rise of context-aware systems, designers are struggling with what variables should be sensed from the context. According to the definitions found in the literature, whether something belongs to context, has to do with whether it is relevant. However, what it means to...
conference paper 2018
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Swart, T.G. (author), Weber, J.H. (author)
We present a systematic variable-to-fixed (VF) length scheme encoding binary information sequences into binary balanced sequences. The redundancy of the proposed scheme is larger than the redundancy of the best fixed-to-fixed (FF) length schemes in case of long codes, but it is smaller in case of short codes. The biggest advantage comes from...
journal article 2018
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Moreno Rodenas, A.M. (author), Cecinati, Francesca (author), Langeveld, J.G. (author), Clemens, F.H.L.R. (author)
Integrated Catchment Modelling aims to simulate jointly urban drainage systems, wastewater treatment plant and rivers. The effect of rainfall input uncertainties in the modelling of individual urban drainage systems has been discussed in several studies already. However, this influence changes when simultaneously simulating several urban...
journal article 2017
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van de Weg, G.S. (author)
Controlling road traffic networks is a complex problem. One of the difficulties is the coordination of actuators, such as traffic lights, variables speed limits, ramp metering and route guidance, with the aim to improve the network performance over a near-future time horizon. This dissertation develops algorithms that specifically balance fast...
doctoral thesis 2017
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Blom, A. (author), Arkesteijn, L. (author), Chavarrias Borras, V. (author), Viparelli, Enrica (author)
journal article 2017
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Sun, Y. (author), Ditmar, P.G. (author), Riva, R.E.M. (author)
coefficients by combing Gravity Recovery and Climate Experiment (GRACE) data withoceanic mass anomalies (combination approach).With respect to the method by Swenson et al.,the proposed approach exploits noise covariance information of both...
journal article 2017
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Henriques, Margarida Vigario (author), Stikkelman, R.M. (author)
Renewable energy sources are currently presented as an economically viable and environmentally safe option in the near future. A major constraint to the incorporation of wind and solar generation at large scale is the increase of variability in the power system. To assure the perpetual balance between power production and gross consumption a...
conference paper 2017
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Dintzner, N.J.R. (author)
Most modern software systems can be adjusted to satisfy sets of conflicting requirements issued by different groups of users, based on their intended usage or execution context. For systems where configurations are a core concern, specific implementation mechanisms are put in place to allow the instantiation of sets of tailored components. Among...
doctoral thesis 2017
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He, D. (author)
Belt conveyors are widely used in bulk solids handling and conveying systems. Considering the extensive use of belt conveyors, their operations involve a large amount of energy. Taking the relevant economic and social challenges into account, there is a strong demand for lowering the energy consumption of belt conveyors, and for reducing the...
doctoral thesis 2017
Searched for: subject:"Variability"
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