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Methenitis, G. (author), De Kok, P.M. (author), Nugteren, S. (author), Visser, A. (author)
In this paper an extension of the model-based visual compass is presented, which can be updated continuously, allowing a robot to orient itself in a changing environment. To build a model, colors in the image are discretized to an automatically generated color profile, and transitions between these classes within vertical lines are used as...
conference paper 2013
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Groenewegen, D.M. (author), Hemel, Z. (author), Kats, L.C.L. (author), Visser, E. (author)
conference paper 2008
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Zhao, G. (author), Visser, P.J. (author), Vrijling, J.K. (author)
This paper describes the hydrodynamic erosion process of undisturbed clay due to the turbulent flow, based on theoretical analysis and experimental results. The undisturbed clay has the unique and complicated characteristics of cohesive force among clay particles, which are highly different from disturbed clay and non-cohesive sand. Based on...
conference paper 2011
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Braakenburg, M.L. (author), Hartjes, S. (author), Visser, H.G. (author), Hebly, S.J. (author)
This paper presents preliminary results from an ongoing research effort towards the development of a multi-event trajectory optimization methodology that allows to synthesize RNAV approach routes that minimize a cumulative measure of noise, taking into account the total noise effect aggregated for all inbound flight movements taking place within...
conference paper 2011
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Bisschop, F. (author), Visser, P.J. (author), Van Rhee, C. (author), Verhagen, H.J. (author)
Convential models for the erosion of non-cohesive sediments overestimate the erosion rate induced by high flow velocities. These high flow velocities occur, for instance, in breaching of embankments or dunes (flow velocities up to 10 m/s) or in jetting sand with a trailing suction hopper dredger (30 to 60 m/s). At these very large flow...
conference paper 2010
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Van Chastelet, E. (author), Visser, E. (author), Anslow, C. (author)
Federated conferences such as SPLASH are complex orga- nizations composed of many parts (co-located conferences, symposia, and workshops), and are put together by many different people and committees. Developing the website for such a conference requires a considerable effort, and is often reinvented for each edition of a conference using...
conference paper 2015
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Sagar, J. (author), Visser, A. (author)
For Micro Aerial Vehicles (MAVs), robust obstacle avoidance during flight is a challenging problem because only light weight sensors as monocular cameras can be mounted as payload. With monocular cameras depth perception cannot be estimated from a single view, which means that information has to be estimated by combining images from multiple...
conference paper 2014
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Visser, A. (author), Dijkshoorn, N. (author), Van der Veen, M. (author), Jurriaans, R. (author)
This article describes a method to develop an advanced navigation capability for the standard platform of the IMAV indoor competition: the Parrot AR.Drone. Our development is partlybased on simulation, which requires both a re-alistic sensor and motion model. This article de-scribes how a visual map of the indoor environ-ment can be made,...
conference paper 2011
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Arntzen, M. (author), Van Veen, T.A. (author), Visser, H.G. (author), Simons, D.G. (author)
Aircraft noise annoyance predictions based on traditional tools lack fidelity when modelling a single aircraft flyover. For evaluating annoyance of new procedures, different aircraft types or changing atmospheric conditions, a new modelling approach is necessary. A research effort has been initiated to develop a toolchain that links each of the...
conference paper 2011
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Visser, P.N.A.M. (author), Schrama, E.J.O. (author), Sneeuw, N. (author), Weigelt, M. (author)
The so-called Colombo-Nyquist (Colombo, The global mapping of gravity with two satellites, 1984) rule in satellite geodesy has been revisited. This rule predicts that for a gravimetric satellite flying in a (near-)polar circular repeat orbit, the maximum resolvable geopotential spherical harmonic degree (lmax) is equal to half the number of...
conference paper 2009
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Van den IJssel, J.A.A. (author), Visser, P.N.A.M. (author), Doornbos, E.N. (author), Meyer, U. (author), Bock, H. (author), Jäggi, A. (author)
The state-of-the-art GOCE Satellite-to-Satellite Tracking Instrument (SSTI) delivers high-quality GPS data with an almost continuous 1 Hz data rate, which allows for very Precise Orbit Determination (POD). Despite this good performance, the GPS receiver shows occasional unexpected L2 tracking losses, which mainly occur close to the geomagnetic...
conference paper 2011
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Visser, W.M. (author), Hindriks, K.V. (author), Jonker, C.M. (author)
Preferences are derived in part from knowledge. Knowledge, however, may be defeasible. We present an argumentation framework for deriving qualitative, multi-attribute preferences and incorporate defeasible reasoning about knowledge. Intuitively, preferences based on defeasible conclusions are not as strong as preferences based on certain...
conference paper 2011
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Van der Wal, W. (author), Wang, L. (author), Visser, P.N.A.M. (author), Sneeuw, N. (author), Vermeersen, L.L.A. (author)
GOCE gravity fields are assessed in an area around Reykjanes Ridge. Ship gravity measurements were found to be to inaccurate to determine possible improvement of GOCE gravity field models compared to the best available GRACE gravity field model. Differences between the GOCE gravity field models and EGM2008 does not appear to contain a component...
conference paper 2011
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Visser, W.M. (author), Hindriks, K.V. (author), Jonker, C.M. (author)
Preferences are derived in part from knowledge. Knowledge, however, may be defeasible. We present an argumentation framework for deriving qualitative, multi-attribute preferences and incorporate defeasible reasoning about knowledge. Intuitively, preferences based on defeasible conclusions are not as strong as preferences based on certain...
conference paper 2011
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Visser, M. (author), Wieringa, P.A. (author)
conference paper 1998
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Visser, P.J. (author), Vrijling, J.K. (author), Verhagen, H.J. (author)
The set-up and results of a field experiment on sand-dike breach erosion are described, It is found that the breaching process for the 2.2 m high sand-dike is similar to that in Visser's (1988) laboratory experiments with a 0.6 m high sand-dike. Confrontation of Visser's (1988) breach erosion model with the field data shows reasonable agreement...
conference paper 1990
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Peeters, P. (author), Van Hoestenberghe, T. (author), Vincke, L. (author), Visser, P.J. (author)
The use of breach models includes two tasks: predicting breach characteristics and estimating flow through the breach. Strengths and weaknesses as well as opportunities and threats of different simplified and detailed physically-based breach models are listed following theoretical and practical criteria. According to the theoretical criteria,...
conference paper 2011
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Hindriks, K.V. (author), Jonker, C.M. (author), Visser, W. (author)
conference paper 2009
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Keuning, Lex J.A. (author), Visser, Douwe B. (author)
conference paper 2000
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Visser, W. (author), Aydogan, R. (author), Hindriks, K.V. (author), Jonker, C.M. (author)
conference paper 2012
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