- document
-
The evolution of coherent structures in a flat plate boundary layer transition induced by the cylinder wake is investigated using the particle image velocimetry (PIV) technique. The finite-time Lyapunov exponent (FTLE), which characterizes the amount of stretching about the flow trajectory, is used to extract the Lagrangian coherent structures....conference paper 2015
- document
-
Ishihara, R. (author), Chen, T. (author), Van der Zwan, M. (author), He, M. (author), Schellevis, H. (author), Beenakker, K. (author)Existent flat-panel display is mechanically stiff because it requires external connection of IC chips. At its present stage, displays with a-Si, metal oxide semiconductor or organic TFTs require still external connection of data driver and controllers, because of their low carrier mobilities. We will review our recent progress on direct...conference paper 2011
- document
-
We report on measurements of the mean-flow Reynolds number ReU and the rms fluctuation Reynolds number ReV in turbulent Rayleigh-Bénard convection as a function of the Rayleigh number Ra for 4 x 1011 < Ra < 2 1014 and Pr ' 0:8. Both can be described by the same power law with an effective exponent = 0:44, in agreement with predictions for ReU...conference paper 2015
- document
- He, Y. (author) conference paper 2000
- document
- Van Dijk, N.H. (author), He, S. (author), Paladugu, M. (author), Schut, H. (author), Van der Zwaag, S. (author) conference paper 2011
- document
- Guo, R. (author), Li, L. (author), He, B. (author), Luo, P. (author), Ying, S. (author), Zhao, Z. (author), Jiang, R. (author) conference paper 2011
- document
- Stroeven, P. (author), He, H. (author), Le, L.B.N. (author), Li, K. (author) conference paper 2014
- document
-
Stroeven, P. (author), He, H. (author), Le, L.B.N. (author)Realistic simulation of particulate materials like concrete on meso- as well as micro-level is nowadays possible by fast developments in computer technology. This would be a more economic way than by physical experiinents, which are more time-consuming, laborious and thus expensive. This concern the production of the aggregate structure or of...conference paper 2012
- document
-
Thermally driven turbulent convection under the influence of global rotation is ubiquitous in nature. Well known examples are the outer convective shell of our Sun and the outer liquid core of the Earth. Trying to understand the underlying dynamics of such flows is highly challenging, not only because of the enormous range in length- and time...conference paper 2015
- document
-
He, J. (author), Suau, M. (author), Baier, Hendrik (author), Kaisers, Michael (author), Oliehoek, F.A. (author)How can we plan efficiently in a large and complex environment when the time budget is limited? Given the original simulator of the environment, which may be computationally very demanding, we propose to learn online an approximate but much faster simulator that improves over time. To plan reliably and efficiently while the approximate simulator...conference paper 2022
- document
-
Suau, M. (author), He, J. (author), Spaan, M.T.J. (author), Oliehoek, F.A. (author)Learning effective policies for real-world problems is still an open challenge for the field of reinforcement learning (RL). The main limitation being the amount of data needed and the pace at which that data can be obtained. In this paper, we study how to build lightweight simulators of complicated systems that can run sufficiently fast for...conference paper 2022
- document
-
Sun, P. (author), Van Mieghem, P.F.A. (author), Kooij, Robert (author), He, Z. (author), Van Mieghem, Piet (author)In this paper, we propose closed-form analytic approximations for the minimum number of driver nodes needed to fully control networks, where links are removed according to both random and targeted attacks. Our approximations rely on the concept of critical links. A link is called critical if its removal increases the required number of driver...conference paper 2019
- document
-
Suau, M. (author), He, J. (author), Çelikok, Mustafa Mert (author), Spaan, M.T.J. (author), Oliehoek, F.A. (author)Due to its high sample complexity, simulation is, as of today, critical for the successful application of reinforcement learning. Many real-world problems, however, exhibit overly complex dynamics, which makes their full-scale simulation computationally slow. In this paper, we show how to factorize large networked systems of many agents into...conference paper 2022
- document
-
Feng, W. (author), He, P. (author), Koetsier, M. (author), Pavlovic, M. (author)Wrapped composite joint is an innovative technique which connects steel hollow sections through bonding such that the fatigue performance is improved compared to welded joint. In this paper, a DIC-based method of monitoring surface strains is proposed to quantify the debonding crack propagation within the composite wrap layers during high cycle...conference paper 2022
- document
-
Igl, Maximilian (author), Gambardella, Andrew (author), He, J. (author), Nardelli, Nantas (author), Siddharth, N (author), Böhmer, J.W. (author), Whiteson, Shimon (author)We present Multitask Soft Option Learning (MSOL), a hierarchical multitask framework based on Planning as Inference. MSOL extends the concept of options, using separate variational posteriors for each task, regularized by a shared prior. This “soft” version of options avoids several instabilities during training in a multitask setting, and...conference paper 2020
- document
-
He, S. (author), Lukovic, M. (author), Jonkers, H.M. (author), Schlangen, E. (author)In the current study, experiments were carried out to investigate the structural performance of reinforced concrete (RC) beams with a self-healing cover zone. The cover zone consists of a 1.5-cm-thick layer of bacteria-embedded strain hardening cementitious composite (SHCC) for a combination of crack width control and crack healing. The aim is...conference paper 2023
- document
-
Dabrowski, M.M. (author), Stead, D. (author), Yu, Feng (author), He, J. (author)In some of the delta cities which are the most exposed to flooding caused by climate change - like Shenzhen and Guangzhou investigated in this paper - there is surprisingly little recognition of this problem and hardly any action is taken to address it. This paper draws on the insights from these two cases to address the following research...conference paper 2016
- document
-
van Duin, Ron (author), Wiegmans, B. (author), Tavasszy, Lorant (author), Hendriks, B. (author), He, Y. (author)Five years ago the project Cargo Hitching started with the goal to use the unused capacity of public transport passenger vehicles for freight and parcel transport. Like many new city logistics initiatives it is a difficult challenge to setup a profitable private business model. A rural pilot project was developed in the East of the Netherlands,...conference paper 2018
- document
-
He, L. (author), de Weerdt, M.M. (author), Yorke-Smith, N. (author), Liu, Xiaolu (author), Chen, Yingwu (author)Agile Earth observation satellite (AEOS) scheduling is complex, due to long visible time windows and time-dependent transitions between observations. We introduce a generic approach suited for scheduling problems characterised by time-dependency and/or sequence-dependency. Our approach is a novel hybridization of adaptive large neighbourhood...conference paper 2018
- document
-
He, G. (author), Balayn, A.M.A. (author), Buijsman, S.N.R. (author), Yang, J. (author), Gadiraju, Ujwal (author)With recent advances in explainable artificial intelligence (XAI), researchers have started to pay attention to concept-level explanations, which explain model predictions with a high level of abstraction. However, such explanations may be difficult to digest for laypeople due to the potential knowledge gap and the concomitant cognitive load....conference paper 2022