Searched for: subject:"space%5C-time"
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van Sandick, Florence (author)
Louisiana, USA, operates as an oilscape, sacrificing its landscape in pursuit of economic prosperity through the oil and gas industry. Combined with sea level rise, this has resulted in continuous land loss since the fifties, making the Louisiana coast one of the fastest declining in the world. As a consequence, many communities are living on...
master thesis 2018
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Meijers, B.M. (author), van Oosterom, P.J.M. (author)
This paper reports on the result of an on-going study using Space Filling Curves (SFCs) for indexing and clustering vessel movement message data (obtained via the Automated Identification System, AIS) inside a geographical Database Management System (Geo-DBMS). With AIS, vessels transmit their positions in intervals ranging from 2 seconds to...
journal article 2018
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Arroyo Ohori, G.A.K. (author), Ledoux, H. (author), Stoter, J.E. (author)
Objects of more than three dimensions can be used to model geographic phenomena that occur in space, time and scale. For instance, a single 4D object can be used to represent the changes in a 3D object's shape across time or all its optimal representations at various levels of detail. In this paper, we look at how such higher-dimensional...
journal article 2017
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Qin, Lilong (author), Wu, Manqing (author), Wang, X. (author), Dong, Zhen (author)
Motivated by the sparsity of filter coefficients in full-dimension space-Time adaptive processing (STAP) algorithms, this paper proposes a fast ℓ1-regularized STAP algorithm based on the alternating direction method of multipliers to accelerate the convergence and reduce the calculations. The proposed algorithm uses a splitting variable to...
journal article 2017
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Ten Veldhuis, J.A.E. (author), Ochoa-Rodriguez, S. (author), Gires, A. (author), Van Assel, J. (author), Ichiba, A. (author), Kroll, S. (author), Wang, L. (author), Tchiguirinskaia, I. (author), Schertzer, D. (author), Willems, P. (author)
In this study high resolution precipitation data are used, derived from polarimetric X-band radar at 100 m, 1 min resolution. The data are used to study the impact of different space-time resolutions of rainfall input on urban hydrodynamic modelling response for 9 storms, in 7 urban catchments. The results show that hydrodynamic response...
conference paper 2015
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Wen, Y. (author), Schoups, G.H.W. (author), Van de Giesen, N.C. (author)
journal article 2014
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Pronk, M. (author)
In this thesis we study stochastic evolution equations in Banach spaces. We restrict ourselves to the two following cases. First, we consider equations in which the drift is a closed linear operator that depends on time and is random. Such equations occur as mathematical models in for instance mathematical finance and filtration theory. Second,...
doctoral thesis 2013
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McArdle, G. (author), Demsar, U. (author), Van der Spek, S.C. (author), McLoone, S. (author)
Recent technological advances have increased the quantity of movement data being recorded. While valuable knowledge can be gained by analysing such data, its sheer volume creates challenges. Geovisual analytics, which helps the human cognition process by using tools to reason about data, offers powerful techniques to resolve these challenges....
conference paper 2013
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Koenderink, J.J. (author), Richards, W. (author), Van Doorn, A.J. (author)
Local space-time scrambling of optical data leads to violent jerks and dislocations. On masking these, visual awareness of the scene becomes cohesive, with dislocations discounted as amodally occluding foreground. Such cohesive space-time of awareness is technically illusory because ground truth is jumbled whereas awareness is coherent....
journal article 2012
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Anitori, L. (author)
In most modern high-resolution multi-channel radar systems one of the major problems to deal with is the huge amount of data to be acquired, processed and/or stored. But why do we need all these data? According to the well known Nyquist-Shannon sampling theorem, real signals have to be sampled at at least twice the signal bandwidth to prevent...
doctoral thesis 2012
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Sivapalan, M. (author), Yaeger, M.A. (author), Harman, C.J. (author), Xu, X. (author), Troch, P.A. (author)
This paper presents analysis of annual water balance variability, (1) regional (between-catchment) variability and (2) between-year (interannual) variability and the symmetry between the two. This involved analysis of the annual water balance in terms of a two-stage partitioning, first, of annual precipitation into quick flow and soil wetting...
journal article 2011
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Fang, K. (author)
Broadband wireless communication systems require high transmission rates, where the bandwidth of the transmitted signal is larger than the channel coherence bandwidth. This gives rise to time dispersion of the transmitted symbols or frequency-selectivity with different frequency components exhibiting different gains. The time dispersion of the...
doctoral thesis 2010
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Veraar, M.C. (author), Zimmerschied, J. (author)
journal article 2008
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De Maerschalck, B. (author), Gerritsma, M.I. (author)
Least-squares methods for partial differential equations are based on a norm-equivalence between the error norm and the residual norm. The resulting algebraic system of equations, which is symmetric positive definite, can also be obtained by solving a weighted collocation scheme using least-squares to solve the resulting algebraic equations....
conference paper 2006
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De Maerschalck, B. (author), Gerritsma, M.I. (author)
Least-squares methods for partial differential equations are based on a norm-equivalence between the error norm and the residual norm. The resulting algebraic system of equations, which is symmetric positive definite, can also be obtained by solving a weighted collocation scheme using least-squares to solve the resulting algebraic equations....
conference paper 2006
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Borzi, A. (author), Wogrin, M. (author)
Recent developments on multilevel schemes for open-loop optimal control problems with terminal observation governed by time-dependent reaction-diffusion systems are presented. The solution of optimality systems consisting of reaction-diffusion equations with opposite time orientation is discussed. Of particular importance in applications and for...
conference paper 2006
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Van der Vegt, J.J.W. (author), Klaij, C.M. (author), Van der Bos, F. (author), Van der Ven, H. (author)
An overview is given of a space-time discontinuous Galerkin finite element method for the compressible Navier-Stokes equations. This method is well suited for problems with moving (free) boundaries which require the use of deforming elements. In addition, due to the local discretization, the space-time discontinuous Galerkin method is well...
conference paper 2006
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Munts, E.A. (author)
The Variational Multiscale (VMS) method has appeared as a promising new approach to the Large Eddy Simulation (LES) of turbulent flows. The key advantage of the VMS approach is that it allows different subgrid-scale (SGS) modeling assumptions to be made at different ranges of the resolved scales. Typically, in the VMS method, SGS modeling is...
doctoral thesis 2006
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Van Brummelen, E.H. (author), Van der Zee, K.G. (author), De Borst, R. (author)
The basic iterative method for solving fluid-structure-interaction problems is a defect-correction process based on a partitioning of the underlying operator into a fluid part and a structural part. In the present work we establish for a prototypical model problem that this defect-correction process yields an excellent smoother for multigrid, on...
report 2006
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Michler, C. (author)
Numerical solution methods for fluid-structure interaction are of great importance in many engineering disciplines. The computation of fluid-structure interactions is challenging on account of their free-boundary and multi-physics character. The different length and time scale discretization requirements of the fluid and structure subsystems...
doctoral thesis 2005
Searched for: subject:"space%5C-time"
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