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Mohammadi, M. (author), Tan, Y.H. (author), Hofman, W. (author), Mousavi, S.H. (author)The l1-regularized least square problem has been considered in diverse fields. However, finding its solution is exacting as its objective function is not differentiable. In this paper, we propose a new one-layer neural network to find the optimal solution of the l1-regularized least squares problem. To solve the problem, we first convert it into...article 2018
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- Berkhoff, A.P. (author), Meijer, H.J. (author), van Ophem, S. (author) conference paper 2016
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van Ophem, S. (author), Berkhoff, A.P. (author)Summary For broadband active noise control applications with a rapidly changing primary path, it is desirable to find algorithms with a rapid convergence, a fast tracking performance, and a low computational cost. Recently, a promising algorithm has been presented, called the fast-array Kalman filter, which uses rotation matrices to calculate...article 2016
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Kunnappillil Madhusudhanan, A. (author), Corno, M. (author), Ali Arat, M. (author), Holweg, E. (author)This work discusses a road-tyre friction estimator considering combined tyre slip. The friction estimator design is motivated by its importance in vehicle dynamics control as accurate friction estimation can improve performance and safety. The estimator uses tyre force measurements from Load Sensing Bearing (LSB) technology and does not rely on...article 2016
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- Berkhoff, A.P. (author), Meijer, H.J. (author), van Ophem, S. (author) conference paper 2016
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Kachko, A. (author), van der Ham, L.V. (author), Bardow, A. (author), Vlugt, T.J.H. (author), Goetheer, E.L.V. (author)Chemical absorption of CO2 using aqueous amine-based solvents is one of the common approaches to control acidic gases emissions to the atmosphere. Improvement in the efficiency of industrial processes requires precise monitoring tools that fit with the specific application. Process monitoring using in-line multivariate measurement methods...article 2016
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Muller, C. (author), Maldonado, A.G. (author), Varnek, A. (author), Creton, B. (author)Each oil reservoir could be characterized by a set of parameters such as temperature, pressure, oil composition, and brine salinity, etc. In the context of the chemical enhanced oil recovery (EOR), the selection of high performance surfactants is a challenging and time-consuming task since this strongly depends on the reservoir's conditions. The...article 2015
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Zha, Y. (author), Westerhuis, J.A. (author), Muilwijk, B. (author), Overkamp, K.M. (author), Nijmeijer, B.M. (author), Coulier, L. (author), Smilde, A.K. (author), Punt, P.J. (author)Background: Inhibitors are formed that reduce the fermentation performance of fermenting yeast during the pretreatment process of lignocellulosic biomass. An exometabolomics approach was applied to systematically identify inhibitors in lignocellulosic biomass hydrolysates.Results: We studied the composition and fermentability of 24 different...article 2014
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Tegopoulou, A. (author)Safer road transportation gains increasing attention due to the social and economic impact of road traffic accidents. The long-term goal of the project is the development of an invehicle system for real-time cyclist protection. The system architecture of the cyclist protection system is outlined and design potentials and risks are discussed....report 2014
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van den Berg, R.L.J. (author), Steenbergen, R.D.J.M. (author)In this paper, a damping model for a high-rise building is introduced. This model is used to investigate the possibilities to identify the relative damping contribution of the internal material damping in building elements, energy loss at element interfaces and energy outflow at the interface with the ground. The building is modeled as an Euler...conference paper 2013
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Maleki, A. (author), Anitori, L. (author), Yang, Z. (author), Baraniuk, R.G. (author)Recovering a sparse signal from an undersampled set of random linear measurements is the main problem of interest in compressed sensing. In this paper, we consider the case where both the signal and the measurements are complex-valued. We study the popular recovery method of l1- regularized least squares or LASSO.While several studies have shown...article 2013
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Lahaye, D. (author), Mulckhuyse, W.F.W. (author)Purpose - The purpose of this paper is to provide a framework for the implementation of an adjoint sensitivity formulation for least-squares partial differential equations constrained optimization problems exploiting a multiphysics finite elements package. The estimation of the diffusion coefficient in a Poisson-type diffusion equation is used...article 2012
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Stein, N.E. (author), Hamelers, H.V.M. (author), van Straten, G. (author), Keesman, K.J. (author)Polarization curves are of paramount importance for the detection of toxic components in microbial fuel cell (MFC) based biosensors. In this study, polarization curves were made under non-toxic conditions and under toxic conditions after the addition of various concentrations of nickel, bentazon, sodiumdodecyl sulfate and potassium ferricyanide....article 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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Thissen, U. (author), Coulier, L. (author), Overkamp, K.M. (author), Jetten, J. (author), van de Werff, B.J.C. (author), van de Ven, T. (author), van der Werf, M.J. (author)In agricultural and food products, typical quality parameters are sensory properties, shelf-life, safety, health, nutritional value, crop yield per area and disease resistance. It is known that these parameters are importantly determined by the metabolites in the crops and food products. Metabolomics is the state-of-the-art routine technique...article 2011
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Hunter, A.J. (author), Drinkwater, B.W. (author), Wilcox, P.D. (author)Ultrasonic array images are adversely affected by errors in the assumed or measured imaging parameters. For non-destructive testing and evaluation, this can result in reduced defect detection and characterization performance. In this paper, an autofocus algorithm is presented for estimating and correcting imaging parameter errors using the...article 2011
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TNO Industrie en Techniek (author), Fraanje, P.R. (author), Doelman, N.J. (author), Verhaegen, M. (author)Using a matching pursuit (MP) approach to solve least squares problems with a sparsity constraint sparse controllers are computed to compensate for atmospheric turbulence. The method has been validated by simulation of von Kármán turbulence with frozen flow for the case of prediction, reconstruction and control.conference paper 2010
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Geert Heidema, A. (author), Thissen, U. (author), Boer, J.M.A. (author), Bouwman, F.G. (author), Feskens, E.J.M. (author), Mariman, E.C.M. (author), TNO Kwaliteit van Leven (author)In this study, we applied the multivariate statistical tool Partial Least Squares (PLS) to analyze the relative importance of 83 plasma proteins in relation to coronary heart disease (CHD) mortality and the intermediate end points body mass index, HDL-cholesterol and total cholesterol. From a Dutch monitoring project for cardiovascular disease...article 2009
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Simons, D.G. (author), Snellen, M. (author), Ainslie, M.A. (author), TNO Defensie en Veiligheid (author)Sound backscattered from the seabed has been measured in a 10 × 10-nmi2 region of the North Sea, characterized by a variety of bottom types, including mud, sand, and gravel. The backscattering strength measurements are made by a forward-looking sonar, operating at 100 kHz and tilted at an angle of 30° from the horizontal. Fifty bottom-grab...article 2007
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Barrell, Y. (author), Naus, H.W.L. (author), TNO Defensie en Veiligheid (author)Detection and localisation of hidden magnetic objects is studied. The concomitant disturbance of the earth magnetic field is exploited. Magnetic fields and or gradients are measured with a number of sensors. Two point models for magnetic fields are selected for the analysis: the magnetic dipole and its quadrupole extension. It is shown how to...article 2007
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