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Pileggi, P. (author), Lazovik, E. (author), Broekhuijsen, J. (author), Borth, M. (author), Verriet, J. (author)Digital twins run concurrently with the assets and systems they mirror. They offer real-time execution of advanced control schemes, e.g., for smart buildings, but also various analysis tasks, e.g., for predictive maintenance that ensures resilience. In this, they need to cope with change: The physical twins they mirror operate in a highly...conference paper 2020
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Bosch, T. (author), van Rhijn, G.J.W. (author), Konemann, R. (author), Wilschut, E.S. (author), de Looze, M. (author)Spatial Augmented Reality (sAR) as an assistive technology is a promising tool for experienced and novice industrial workers. Five industrial case studies in Dutch manufacturing companies are described to study the effects of sAR assistance on task completion time, learning speed, product quality, work load, technology acceptance and...conference paper 2020
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van der Zwet, K. (author), Barros, A.I. (author), van Engers, T.M. (author), van der Vecht, B. (author)Organized crime, insurgency and terrorist organizations have a large and undermining impact on societies. This highlights the urgency to better understand the complex dynamics of these individuals and organizations in order to timely detect critical social phase transitions that form a risk for society. In this paper we introduce a new multi...conference paper 2019
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- Sprung, D. (author), Sucher, E. (author), Grossmann, P. (author), Kociok, T. (author), van Eijk, A.M.J. (author), Stein, K. (author) conference paper 2019
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Sucher, E. (author), Sprung, D. (author), Kremer, M. (author), Kociok, T. (author), Van Eijk, A.M.J. (author), Stein, K. (author)Wave propagation of electro-optical systems, lasers or imaging depends on the state of the atmosphere their beams are passing through. Fluctuations in the refractive index of air are responsible for signal attenuation and image degradation. This atmospheric effect is called optical turbulence and its strength is quantified by the structure...conference paper 2018
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Sprung, D. (author), Sucher, E. (author), van Eijk, A.M.J. (author), Eisele, C. (author), Seiffer, D. (author), Stein, K. (author)A field trial was performed in the arid scrub area of White Sands, NM /USA in October 2017 investigating the atmospheric influence on imaging and sensor performance. In this paper we focus on the strength of optical turbulence. Optical turbulence is described by the structure function parameter of the refractive index Cn 2. It is responsible for...conference paper 2018
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Ullwer, C. (author), Sprung, D. (author), van Eijk, A.M.J. (author), Gunter, W. (author), Stein, K. (author)Atmospheric turbulence impacts on the propagation of electro-optical radiation. Typical manifestations of optical turbulence are scintillation (intensity fluctuations), beam wander and (for laser systems) reduction of beam quality. For longer propagation channels, it is important to characterize the vertical and horizontal distribution ...conference paper 2018
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Sprung, D. (author), Van Eijk, A.M.J. (author), Ullwer, C. (author), Gunter, W. (author), Eisele, C. (author), Seiffer, D. (author), Sucher, E. (author), Stein, K. (author)The atmospheric influence on wave propagation was investigated during the First European South African Transmission ExpeRiment from June 2015 to February 2016. The focus in this article was set on optical turbulence, the main atmospheric factor affecting the position and strength of Laser beams, the performance of electro-optical systems and...conference paper 2018
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Kociok, T. (author), February, F. (author), Grossmann, P. (author), Sprung, D. (author), van Eijk, A.M.J. (author), Stein, K. (author)The numerical LOTOS-EUROS model that provides information on the regional distribution of aerosols was implemented for a new domain, Southern Africa. The first set-up for the study areas is discussed and a comparison of model products to experimental data is presented. The model compares favorably to MODIS satellite products on a regional scale....conference paper 2018
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Sprung, D. (author), Sucher, E. (author), Eisele, C. (author), Seiffer, D. (author), van Eijk, A.M.J. (author), Stein, K. (author)Electro-optical and laser systems are presently deployed in naval operations around the world. The performance of these systems is negatively affected by optical turbulence in the atmosphere, quantified by the parameter Cn 2. The strength of the integrated optical turbulence Cn 2 was investigated for several coastal locations in different...conference paper 2017
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van Binsbergen, S.A. (author), Grossmann, P. (author), Cohen, L.H. (author), van Eijk, A.M.J. (author), Stein, K.U. (author)This paper compares in-situ and path-averaged measurements of the electro-optical transmission, with emphasis on aerosol effects. The in-situ sensors consisted of optical particle counters (OPC) and a visibility meter, the path-averaged data was provided by a 7-wavelength transmissometer (MSRT) and a scintillometer (BLS). Data was collected at a...conference paper 2017
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Wetzels, F. (author), van den Berg, H. (author), Bosman, J. (author), van der Mei, R. (author)Pre-congestion notification (PCN) protects inelastic traffic by using feedback on network link loads on and acting upon this accordingly. These actions comprise to admission control and termination of flows. Two PCN architectures have been defined by IETF: the centralized and decentralized PCN architecture. The decentralized PCN architecture has...article 2017
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Sprung, D. (author), Grossmann, P. (author), Sucher, E. (author), van Eijk, A.M.J. (author), Stein, K. (author)Operation and design of electro-optical systems are affected by atmospheric turbulence, quantified by refractive structure function parameter Cn 2. The long-term VerTurM experiment at a rural site in Northwestern Germany served to collect an extended dataset of vertical profiles of Cn 2 values up to 64 meters, completed by a characterization of...conference paper 2017
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Vogelbacher, S. (author), van Eijk, A.M.J. (author), Sprung, D. (author), Cohen, L.H. (author), Sucher, E. (author), Stein, K. (author)A transmission experiment has been performed over an optical path of 1.53 km at a rural test site in Meppen, Northwest Germany. Direct transmission measurements were made by a 7-wavelength transmissometer. Transmission was further estimated from the average voltage received by a BLS2000 scintillometer, and evaluated with Mie theory from in-situ...conference paper 2016
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van Eijk, A.M.J. (author), Piazzola, J. (author), Van Zuijlen, S. (author), Cohen, L. (author), Moerman, M. (author), Missamou, T. (author), Tedeschi, G. (author), Stein, K. (author)A comparison of aerosol data acquired at five different sites around the globe is presented. All data has been acquired with the same instrumentation and representative size distributions for marine air masses at 10 m/s wind speed have been selected for comparison. Differences in the concentrations of larger and smaller aerosols at the various...conference paper 2016
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Eisele, C. (author), Seiffer, D.P. (author), Stein, K. (author), Sucher, E. (author), Gunter, W.H. (author), February, F. (author), Vrahimis, G. (author), Wainman, C. (author), Maritz, B. (author), Koago, M.S. (author), van Eijk, A.M.J. (author), van Iersel, M. (author), Cohen, L.H. (author), van Binsbergen, S.A. (author), Heemskerk, H.J.M.E. (author), Sternberg, A. (author), Schulte, H. (author), van Rheenen, A.D. (author), Brenthagen, E. (author), Thomassen, J.B. (author), Griffith, D. (author)A long term field trial called FESTER (First European South African Transmission Experiment) has been conducted by an international collaboration of research organizations during the course of almost one year at False Bay, South Africa. Main objectives of the experiment are a better insight into atmospherical effects on propagation of optical...conference paper 2016
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Sprung, D. (author), Van Eijk, A.M.J. (author), Sucher, E. (author), Eisele, C. (author), Seiffer, D. (author), Stein, K. (author)The experiment FESTER (First European South African Transmission ExpeRiment) took place in 2015 to investigate the atmospheric influence on electro-optical systems performance across False Bay / South Africa on a long term basis. Several permanent stations for monitoring electro-optical propagation and atmospheric parameters were set up around...conference paper 2016
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Borth, M. (author), Hendriks, M. (author)The design and analysis of smart system behavior needs to bridge between worlds – both with regard to engineering methods and to the technologies central to adaptivity and thus aconference paper 2016
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Maritz, B. (author), Koago, M.S. (author), Wainman, C.K. (author), Gardener, M.E. (author), Gunter, W.H. (author), van Eijk, A.M.J. (author)The First European South African Experiment (FESTER) was conducted over about a 10 month period at the Institute of Maritime Technology (IMT) in False Bay, South Africa. One of the important goals was to validate atmospheric refraction and turbulence models. To achieve this goal it was required to measure the vertical profile of meteorological...conference paper 2016
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Gunter, W.H. (author), Maritz, B. (author), Koago, M. (author), Wainman, C.K. (author), Gardener, M.E. (author), February, F. (author), van Eijk, A.M.J. (author)The First European South African Experiment (FESTER) was conducted over about a 10 month period at the Institute of Maritime Technology (IMT) in False Bay, South Africa. One of the important goals was the establishment of the air-sea temperature difference (ASTD) homogeneity along the main propagation link atmospheric path since it is a basic...conference paper 2016