Výsledky vyhledávání - "Johan Grasman"

Akademický článek

Forecasting product sales with a stochastic Bass model

Publikováno v: Journal of Mathematics in Industry, Vol 9, Iss 1, Pp 1-10 (2019)

Abstract With the Bass model and data of previous sales a point estimate of future sales can be made for the purpose of stock management. In order to obtain information about the accuracy of that estimate a confidence interval can be of use. In this

Externí odkaz: https://doaj.org/article/ac9cb1f0a4374de5958c1ff9f0703431

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Akademický článek

Proportional Insulin Infusion in Closed-Loop Control of Blood Glucose.

Autor: Johan Grasman, Hannah L Callender, Marco Mensink

Publikováno v: PLoS ONE, Vol 12, Iss 1, p e0169135 (2017)

A differential equation model is formulated that describes the dynamics of glucose concentration in blood circulation. The model accounts for the intake of food, expenditure of calories and the control of glucose levels by insulin and glucagon. These

Externí odkaz: https://doaj.org/article/f21463e657e84f2f825de97922dd802a

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Akademický článek

The Dynamics of Addiction: Craving versus Self-Control.

Autor: Johan Grasman, Raoul P P P Grasman, Han L J van der Maas

Publikováno v: PLoS ONE, Vol 11, Iss 6, p e0158323 (2016)

This study deals with addictive acts that exhibit a stable pattern not intervening with the normal routine of daily life. Nevertheless, in the long term such behaviour may result in health damage. Alcohol consumption is an example of such addictive h

Externí odkaz: https://doaj.org/article/f995f16b63b2430fa27386335b696676

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Akademický článek

Reconstruction of the drive underlying food intake and its control by leptin and dieting.

Autor: Johan Grasman

Publikováno v: PLoS ONE, Vol 8, Iss 9, p e74997 (2013)

The intake of food and the expenditure of calories is modelled by a system of differential equations. The state variables are the amount of calories stored in adipose tissue and the level of plasma leptin. The model has as input a drive that controls

Externí odkaz: https://doaj.org/article/adae1c9b614f448d99798aae923f91e7

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Akademický článek

Transitions in smoking behaviour and the design of cessation schemes.

Autor: Johan Grasman, Raoul P P P Grasman, Han L J van der Maas

Publikováno v: PLoS ONE, Vol 7, Iss 10, p e47139 (2012)

The intake of nicotine by smoking cigarettes is modelled by a dynamical system of differential equations. The variables are the internal level of nicotine and the level of craving. The model is based on the dynamics of neural receptors and the way th

Externí odkaz: https://doaj.org/article/d517102dfd26476eadf0598d9ade6846

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Akademický článek

Multimodel Inference for the Prediction of Disease Symptoms and Yield Loss of Potato in a Two-Year Crop Rotation Experiment

Autor: Wim Van den Berg, Jan Vos, Johan Grasman

Publikováno v: International Journal of Agronomy, Vol 2012 (2012)

The second order Akaike information criterion was used for the assessment of 139 regression models for three responses of potato test crops: (a) incidence of Spongospora subterranea on the harvested tubers, (b) percentage of haulms infected with Vert

Externí odkaz: https://doaj.org/article/1f22fa5eeb8040b383401a0e375f08c8

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Forecasting product sales with a stochastic Bass model

Autor: M. Kornelis, Johan Grasman

Publikováno v: Journal of Mathematics in Industry 9 (2019)
Journal of Mathematics in Industry, 9
Journal of Mathematics in Industry, Vol 9, Iss 1, Pp 1-10 (2019)

With the Bass model and data of previous sales a point estimate of future sales can be made for the purpose of stock management. In order to obtain information about the accuracy of that estimate a confidence interval can be of use. In this study suc

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7a0b25ed000e7f49dec2de577a5a889e
https://doi.org/10.1186/s13362-019-0059-6

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Roll dynamics of a ship sailing in large amplitude head waves

Autor: E. F. G. van Daalen, M. Gunsing, J. Remmert, Johan Grasman

Publikováno v: Journal of Engineering Mathematics 89 (2014) 1
Journal of Engineering Mathematics, 89(1), 137-146

Some ship types may show significant rolling when sailing in large-amplitude (near) head waves. The dynamics of the ship are such that the roll motion is affected by the elevation of the encountering waves. If the natural roll period (without forcing

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5a12bd1dcb3e03f66315dcd60b2b889c
https://doi.org/10.1007/s10665-014-9687-4

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The Dynamics of Addiction: Craving versus Self-Control

Autor: Raoul P. P. P. Grasman, Han L. J. van der Maas, Johan Grasman

Publikováno v: PLoS ONE
PLoS ONE, Vol 11, Iss 6, p e0158323 (2016)
PLoS ONE, 11(6)
PLoS ONE, 11(6):e0158323. Public Library of Science
PLoS ONE 11 (2016) 6

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2b3112e4cb0f9c72c219244cb92cb40c
https://pubmed.ncbi.nlm.nih.gov/27352037

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Testing a method for analyzing the effect of parameter change in climate driven ecological systems

Autor: Maarten de Gee, Hanneke E. Moolenaar, Frank Selten, Johan Grasman

Publikováno v: Ecological Modelling, 205(3-4), 289-300
Ecological Modelling 205 (2007) 3-4

In this study, we consider a herbivore-predator metapopulation model, consisting of two patches. Only the herbivores are allowed to migrate between the patches. Furthermore, the intrinsic growth rates of the herbivores depend on climatic fluctuations

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::017d9e992418d20985ee91a7ea5b2193
https://doi.org/10.1016/j.ecolmodel.2007.02.021

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