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Ramaswamy, K.R. (author), Fonseca, R.M. (author), Leeuwenburgh, O. (author), Siraj, M.M. (author), van den Hof, P.M.J. (author)We are concerned with the efficiency of stochastic gradient estimation methods for large-scale nonlinear optimization in the presence of uncertainty. These methods aim to estimate an approximate gradient from a limited number of random input vector samples and corresponding objective function values. Ensemble methods usually employ Gaussian...article 2020
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Scapino, L. (author), de Servi, C. (author), Zondag, H.A. (author), Diriken, J. (author), Rindt, C.C.M. (author), Sciacovelli, A. (author)Sorption thermal energy storage (STES) has the potential to have higher energy densities and lower thermal losses compared to conventional thermal storage technologies, and it can contribute to increase the energy grid flexibility and the penetration of intermittent and distributed energy sources. However, STES is a technology still under...article 2020
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van Putten, B.J.C. (author), van der Sanden, B. (author), Reniers, M. (author), Voeten, J. (author), Schiffelers, R (author)One of the challenges in the design of supervisors with optimal throughput for manufacturing systems is the presence of behavior outside the control of the supervisor. Uncontrollable behavior is typically encountered in the presence of (user) inputs, external disturbances, and exceptional behavior. This paper introduces an approach for the...conference paper 2020
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Sioutas, S. (author), Stuijk, S. (author), Basten, T. (author), Corporaal, H. (author), Somers, L. (author)The Halide DSL and compiler have enabled high-performance code generation for image processing pipelines targeting heterogeneous architectures through the separation of algorithmic description and optimization schedule. However, automatic schedule generation is currently only possible for multi-core CPU architectures. As a result, expert...conference paper 2020
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Nadolski, V. (author), Rózsás, Á. (author), Sýkora, M. (author)Partial factors are commonly based on expert judgements and on calibration to previous design formats. This inevitably results in unbalanced structural reliability for different types of construction materials, loads and limit states. Probabilistic calibration makes it possible to account for plentiful requirements on structural performance,...article 2019
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Kahrobaei, S.S. (author), Fonseca, R.M. (author), Willems, C.J.L. (author), Wilschut, F. (author), Wees, J.D.A.M. (author)In the geothermal energy domain, it is common practice to drill a doublet (i.e. an injection and production well pair) system for heat production from the subsurface. Injector-producer spacing typically varies between 1 to 2 km. This well spacing distance is usually chosen through engineering judgement. The concept of drilling doublet systems is...conference paper 2019
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Fransman, J.E. (author), Sijs, J. (author), Dol, H.S. (author), Theunissen, E. (author), de Schutter, B. (author)In this work, the novel algorithm Bayesian Dynamic Programming Optimization Procedure (B-DPOP) is presented to solve multi-agent problems within the Distributed Constraint Optimization Problem framework. The Bayesian optimization framework is used to prove convergence to the global optimum of the B-DPOP algorithm for Lipschitz-continuous...conference paper 2019
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Medina, R. (author), Valencia, J. (author), Stuijk, S. (author), Goswami, D. (author), Basten, T. (author)Pipelined image-based control uses parallel instances of its image-processing algorithm in a pipelined fashion to improve the quality of control. A performance-oriented control design improves the controller settling time with each additional processing resource, which creates a resources-performance trade-off. In real-life applications, it is...article 2019
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Hildmann, H. (author), Kovacs, E. (author), Saffre, F. (author), Isakovic, A.F. (author)Unmanned Aerial Vehicles (UAVs) with acceptable performance are becoming commercially available at an affordable cost. Due to this, the use of drones for real-time data collection is becoming common practice by individual practitioners in the areas of e.g., precision agriculture and civil defense such as fire fighting. At the same time, as UAVs...article 2019
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Katliar, M. (author), Olivari, M. (author), Drop, F.M. (author), Nooij, S. (author), Diehl, M. (author), Bülthoff, H.H. (author)This paper presents a method to simultaneously compute optimal simulator motions and simulator parameters for a predefined set of vehicle motions. The optimization can be performed with a model of human motion perception or sensory dynamics taken into account. The simulator dynamics, sensory dynamics, and optimality criterion are provided by the...article 2019
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Bruijns, L.A.M. (author), Phillipson, F. (author), Sangers, A. (author)We provide a method to obtain a User Equilibrium in a transportation network, in which we transport containers for multiple agents. The User Equilibrium solution is defined as the solution wherein each agent can travel via their cheapest paths possible, and no agent is harmed by the route choice of other agents. The underlying model used is the...conference paper 2019
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Saffre, F. (author), Gianini, G. (author), Hildmann, H. (author), Davies, J. (author), Bullock, S. (author), Damiani, E. (author), Deneubourg, J.L. (author)We investigate the hypothesis that long-term memory in populations of agents can lead to counterproductive emergent properties at the system level. Our investigation is framed in the context of a discrete, one-dimensional road-traffic congestion model: we investigate the influence of simple cognition in a population of rational commuter agents...article 2019
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- Sagastizabal, R. (author), Bonet-Monroig, X. (author), Singh, M. (author), Rol, M.A. (author), Bultink, C.C. (author), Fu, X. (author), Price, C.H. (author), Ostroukh, V.P. (author), Muthusubramanian, N. (author), Bruno, A. (author), Beekman, M. (author), Haider, N. (author), O'Brien, T.E. (author), Dicarlo, L. (author) article 2019
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van Kooten, M. (author), Doelman, N.J. (author), Kenworthy, M. (author)For high-contrast imaging systems, the time delay is one of the major limiting factors for the performance of the extreme adaptive optics (AO) sub-system and, in turn, the final contrast. The time delay is due to the finite time needed to measure the incoming disturbance and then apply the correction. By predicting the behavior of the...article 2019
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Constrained multivariable extremum-seeking for online fuel-efficiency optimization of Diesel enginesvan der Weijst, R. (author), van Keulen, T. (author), Willems, F.P.T. (author)This work presents a new method for online fuel-efficiency optimization of Diesel engines, using constrained extremum-seeking. A two-input optimization problem, which is suitable for extremum-seeking, is integrated into a tracking control system. As a result, both air-path and fuel-path actuators are used for tracking and extremum-seeking. A key...article 2019
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Xia, L. (author), Willems, R. (author), Jager, B.D. (author), Willems, F. (author)Fuel efficiency optimization and emission reduction have become essential parts of engine research, due to the growing demand for environmental protection. In this paper, a computationally efficient optimization method has been applied to maximize the fuel efficiency under constraints of maximum pressure rise rate and various pollutant emissions...conference paper 2019
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Laan, C.M. (author), Barros, A.I. (author), Boucherie, R.J. (author), Monsuur, H. (author), Timmer, J. (author)In this paper, we introduce partially observable agent-intruder games (POAIGs). These games model dynamic search games on graphs between security forces (an agent) and an intruder given possible (border) entry points and high value assets that require protection. The agent faces situations with dynamically changing, partially observable...article 2019
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de Ridder, F. (author), Neumann, N.M.P. (author), Veugen, P.J.M. (author), Kooij, R. (author)In this work, we consider the following problem: given a graph, the addition of which single edge minimises the effective graph resistance of the resulting (or, augmented) graph. A graph’s effective graph resistance is inversely proportional to its robustness, which means the graph augmentation problem is relevant to, in particular, applications...conference paper 2019
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Kolodziejak, D.P.H. (author), Pham, T.H. (author), Hofman, T. (author), Wilkins, S. (author)This paper develops an optimization framework to minimize the Total Cost of Ownership (TCO) for Plug-in Hybrid Electric Vehicles (PHEVs). In this paper, TCO is the summation of operational and main vehicle powertrain components cost. The developed optimization framework is formulated via combining convex optimization and Dynamic Programming...conference paper 2019
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Boros, T. (author), Zuraniewski, P. (author), Hindriks, H.N. (author), Adrichem, N.L.M. (author), Thomas, E.D.R. (author), D'Acunto, L. (author)5G promises to offer a single network platform that can be optimized for several vertical industries and applications. It is envisioned that this optimization will be achieved through advanced network orchestration functionalities. Video streaming accounts for the vast majority of mobile traffic, hence optimizing performance and Quality of...conference paper 2019