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Vink, G. (author), Frank, L.E. (author), Pannekoek, J. (author), van Buuren, S. (author)Multiple imputation methods properly account for the uncertainty of missing data. One of those methods for creating multiple imputations is predictive mean matching (PMM), a general purpose method. Little is known about the performance of PMM in imputing non-normal semicontinuous data (skewed data with a point mass at a certain value and...article 2014
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Livshits, I. (author), Hou, Z. (author), van Grol, P. (author), Shao, Y. (author), van Turnhout, M. (author), Urbach, H.P. (author), Bociort, F. (author)The present research is part of an effort to develop tools that make the lens design process more systematic. In typical optical design tasks, the presence of many local minima in the optical merit function landscape makes design non-trivial. With the method of Saddle Point Construction (SPC) which was developed recently ([F. Bociort and M. van...conference paper 2014
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Method to calculate additional ramps explicity (CARE) in quantitative risk analysis for road tunnelsNelisse, R.M.L. (author), Vrouwenvelder, A.C.W.M. (author)Article 13 of the EU Directive on minimum safety requirements for tunnels in the Trans-European Road Network states that a risk analysis, where necessary, shall be carried out. In the Netherlands, the risk of decease for road users in a tunnel (internal risk) is calculated with a model for quantitative risk analysis, which is called “QRA-tunnels...conference paper 2014
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Scholtes-Timmerman, M.J. (author), Bijlsma, S. (author), Fokkert, M.J. (author), Slingerland, R. (author), van Veen, S.J.F. (author)Self-monitoring of glucose is important for managing diabetes. Noninvasive glucose monitors are not yet available, but patients would benefit highly from such a device. We present results that may lead to a novel, point-of-care noninvasive system to measure blood glucose based on Raman spectroscopy. A hospitalized cohort of 111 subjects was...article 2014
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van den Ende, D. (author), Verhoeven, F. (author), van der Eijnden, P. (author), Kusters, R. (author), Sridhar, A. (author), Cauwe, M. (author), van den Brand, J. (author)Ultra-thin chips of less than 20μm become flexible, allowing integration of silicon IC technology with highly flexible electronics. This combination allows for highly intelligent products of unprecedented thinness, flexibility and cost. Examples include sensor systems integrated into food packaging or healthcare and sport monitoring tags as...conference paper 2013
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James, N.K. (author), van den Ende, D.A. (author), Lafont, U. (author), van der Zwaag, S. (author), Groen, W.A. (author)Structured lead zirconium titanate (PZT)-epoxy composites are prepared by dielectrophoresis. The piezoelectric and dielectric properties of the composites as a function of PZT volume fraction are investigated and compared with the corresponding unstructured composites. The effect of poling voltage on piezoelectric properties of the composites is...article 2013
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Burghouts, G.J. (author)The bag-of-features model is a distinctive and robust approach to detect human actions in videos. The discriminative power of this model relies heavily on the quantization of the video features into visual words. The quantization determines how well the visual words describe the human action. Random forests have proven to efficiently transform...article 2013
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Identification and cross-checking of large point source SO2 emissions in Europe using OMI retrievalsvan der Gon, H.D. (author), Visschedijk, A. (author), McLinden, C. (author), Fioletov, V. (author), van der Wal, L. (author)European SO2 emissions from large points sources (LPS) were cross-checked with satellite S2 measurements from the Ozone Monitoring Instrument (OMI) on NASA's EOS-Aura satellite, averaged over a period of several years. Coordinates of the top-100 individual LPS in Europe were taken from the TNO point source database and corresponding OMI S2 plots...conference paper 2013
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Burghouts, G.J. (author), van den Broek, S.P. (author), ten Hove, R.J.M. (author)Human actions are spatio-temporal patterns. A popular representation is to describe the action by features at interest points. Because the interest point detection and feature description are generic processes, they are not tuned to discriminate one particular action from the other. In this paper we propose a saliency measure for each individual...conference paper 2013
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Lai, W.-Y. (author), Balfour, M.N. (author), Levell, J.W. (author), Bansal, A.K. (author), Burn, P.L. (author), Lo, S.-C. (author), Samuel, I.D.W. (author)Phosphorescent poly(dendrimers) with a norbornene-derived backbone have been synthesized using ring-opening metathesis polymerization with the Grubbs III catalyst. The dendrimers are comprised of a heteroleptic iridium(III) complex core with two 2-phenylpyridyl ligands and a phenyltriazolyl ligand, biphenyl-based dendrons, and 2-ethylhexyloxy...article 2012
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Teland, J.A. (author), van Doormaal, J.C.A.M. (author)Blast waves from explosions can cause lethal injuries to humans. Development of injury criteria has been ongoing for many years, but with the main focus on free field conditions. However, with terrorist actions as a new threat, explosions in urban areas have become of much more interest. Urban areas provide a complex environment for blast wave...conference paper 2012
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Andrei, R.M. (author), Fraanje, P.R. (author), Verhaegen, M. (author), Korkiakoski, V.A. (author), Keller, C.U. (author), Doelman, N.J. (author)We propose a new approach for the joint estimation of aberration parameters and unknown object from diversity images with applications in imaging systems with extended objects as astronomical ground-based observations or solar telescopes. The motivation behind our idea is to decrease the computational complexity of the conventional phase...conference paper 2012
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Andrei, R.M. (author), Smith, C.S. (author), Fraanje, P.R. (author), Verhaegen, M. (author), Korkiakoski, V.A. (author), Keller, C.U. (author), Doelman, N.J. (author)In this paper we give a new wavefront estimation technique that overcomes the main disadvantages of the phase diversity (PD) algorithms, namely the large computational complexity and the fact that the solutions can get stuck in a local minima. Our approach gives a good starting point for an iterative algorithm based on solving a linear system,...conference paper 2012
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Pijnenburg, J.A.C.M. (author), te Voert, M.J.A. (author), de Vreugd, J. (author), Vosteen, L.L.A. (author), van Werkhoven, W.P. (author), Mekking, J. (author), Nijland, B.A.H. (author)Through the years many stable optical mounts have been designed, analyzed and tested at TNO. This paper gives an overview of the design principles used. Various examples are presented together with verification test results. The use of adhesives in combination with an iso-static mount design allows mounting of optical components in a limited...public lecture 2012
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Pijnenburg, J.A.C.M. (author), te Voert, M.J.A. (author), de Vreugd, J. (author), Vosteen, L.L.A. (author), van Werkhoven, W.P. (author), Mekking, J. (author), Nijland, B.A.H. (author)Through the years many stable optical mounts have been designed, analyzed and tested at TNO. This paper gives an overview of the design principles used. Various examples are presented together with verification test results. The use of adhesives in combination with an iso-static mount design allows mounting of optical components in a limited...conference paper 2012
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Bieser, J. (author), Aulinger, A. (author), Matthias, V. (author), Quante, M. (author), Denier Van Der Gon, H.A.C. (author)The vertical allocation of emissions has a major impact on results of Chemistry Transport Models. However, in Europe it is still common to use fixed vertical profiles based on rough estimates to determine the emission height of point sources. This publication introduces a set of new vertical profiles for the use in chemistry transport modeling...article 2011
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Schoen, E. (author), Jones, B. (author), Goos, P. (author)Problem: The dairy company FrieslandCampina had an opportunity to redesign the production process for its coffee cream. This product has a very specific viscosity, and the redesigned process had to result in the same viscosity as the old one. Approach: For an effective redesign, the investigators wanted to obtain a simple model linking the...article 2011
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Neele, F. (author), Koenen, M. (author), van Deurzen, J. (author), Seebregts, A. (author), Groenenberg, H. (author), Thielemann, T. (author)Carbon Capture and Storage (CCS) is one of the measures that can be used to reduce CO2 emissions to the atmosphere in Europe. Of the total CCS chain the transport infrastructure may be the most planning and guidance-intensive part during the development of large-scale CCS. The EU FP7 CO2 Europipe project aims to pave the road towards large-scale...conference paper 2011
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Farrelly, I. (author), Loske, B. (author), Neele, F. (author), Holdstock, M. (author)The largest single point CO2 emitter in Ireland, the Moneypoint Power Station (3.95 Mt CO2 per annum), is located in Co. Clare and geologically lies within the Clare Basin. In terms of the economics of transportation of CO2 from Moneypoint, a possible local storage site would be favoured. The study investigated a number of critical criteria with...conference paper 2011
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Garakoui, S.K. (author), Klumperink, E.A.M. (author), Nauta, B. (author), van Vliet, F.E. (author)Practical time delay circuits do not have a perfectly linear phase-frequency characteristic. When these delay circuits are applied in a phased-array system, this frequency dependency shows up as a frequency dependent beam direction (“beam squinting”). This paper quantifies beam squinting for a linear one-dimensional phased array with equally...conference paper 2011