#### Filter Results:

- Full text PDF available (7)

#### Publication Year

2000

2016

- This year (0)
- Last 5 years (5)
- Last 10 years (7)

#### Publication Type

#### Co-author

#### Journals and Conferences

#### Key Phrases

Learn More

- S Neuenfeldt, D Righton, +10 authors J Metcalfe
- Journal of fish biology
- 2013

The application of data storage tags bears the potential for a quantum leap in the research on fish migrations, because not only first-capture and recapture positions are known, but at least theoretically, the migration path during the period at large can be reconstructed. Position, however, cannot be measured directly but has to be estimated using the… (More)

- Benjamin Planque, Ulf Lindstrøm, Sam Subbey, André Chiaradia
- PloS one
- 2014

A novel approach to model food-web dynamics, based on a combination of chance (randomness) and necessity (system constraints), was presented by Mullon et al. in 2009. Based on simulations for the Benguela ecosystem, they concluded that observed patterns of ecosystem variability may simply result from basic structural constraints within which the ecosystem… (More)

- S. Subbey
- 2000

where the kernel K is known exactly and given by the underlying mathematical model. g is only known with a limited degree of accuracy in a finite and discrete set of points x1, . . . , xM . However, the sought function f (t) is continuous. By the nature of the right-hand side, g(x), equation (1) is a discrete inverse problem which is ill-posed in the sense… (More)

- Erik Natvig, Sam Subbey
- 2011

Based on vertical movement data derived from electronic storage tags (DST) attached to fish, we construct a stochastic model that aims at capturing the main characteristics of the observations over one year. We use a mixed Ornstein-Uhlenbeck process to model attraction to a limited number of concentration points on the depth axis. A methodology for… (More)

- Sam Subbey, Benjamin Planque, Ulf Lindstrøm
- Journal of mathematical biology
- 2016

This paper explores the stochastic dynamics of a simple foodweb system using a network model that mimics interacting species in a biosystem. It is shown that the system can be described by a set of ordinary differential equations with real-valued uncertain parameters, which satisfy a set of linear inequality constraints. The constraints restrict the… (More)

- Sam Subbey, Kathrine Michalsen, Geir Kjetil Nilsen
- Reviews in Fish Biology and Fisheries
- 2007

Electronic Data Storage Tags (DSTs) have the potential of providing long term, high-resolution observation data of individual fish in the ecosystem. However, traditional time series analysis methods are limited in extracting the required information from DSTs. The continuous wavelet transform (CWT) is a tool for decomposing a time series into instantaneous… (More)

EAGE Workshop: Integrating Reservoir Engineering with Geology and Geophysics, 26 May 2002 Summary This paper will describe a technique for generating an ensemble of history matching models using the Neighbourhood Approximation algorithm. Using the ensemble of models generated, we demonstrate how uncertainty in reservoir performance prediction can be… (More)

- Ute Schaarschmidt, Trond Steihaug, Sam Subbey
- MCO
- 2015

The performance of oil reservoirs is inherently uncertain: data constraining the rock and rockfluid properties is available at only a small number of spatial locations, and other measurements are integrated responses providing limited constraints on model properties. Calibrating a reservoir model to observed data is time consuming, and it is rare for… (More)

- Sam Subbey, Mike Christie, Malcolm Sambridge
- SIAM J. Scientific Computing
- 2004

The capillary pressure in a reservoir determines the saturation distribution, and hence the total in situ volumes of fluids (oil/water/gas). The accurate knowledge of the capillary pressure distribution is one of the primary factors that may be decisive in the reliable estimation of hydrocarbon reserves. The centrifuge procedure provides laboratory data,… (More)