Blar i Department of Business and Management Science på forfatter "Ussif, Al-Amin M."
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Assimilation of real time series data into a dynamic bioeconomic fisheries model : an application to the Norwegian cod fishery stock
Ussif, Al-Amin M.; Sandal, Leif Kristoffer; Steinshamn, Stein Ivar (Discussion paper, Working paper, 2000-05)This paper combines the new and elegant technique of inverse methods and a Monte Carlo procedure to analyze real data for the Norwegian cod fishery (NCF) stock. A simple nonlinear dynamic resource model is calibrated to ... -
Data assimilation into biomass dynamics models : a Monte Carlo simulation experiment
Ussif, Al-Amin M.; Sandal, Leif Kristoffer; Steinshamn, Stein Ivar; Morey, Steven L. (Discussion paper, Working paper, 2001)In this paper, we use a variational data assimilation method to fit biomass dynamics models to simulated data. The method is the variational adjoint technique in which a cost function measuring the distance between the ... -
Estimation of biological and economic parameters of a bioeconomic fisheries model using dynamical data assimilation
Ussif, Al-Amin M.; Sandal, Leif Kristoffer; Steinshamn, Stein Ivar (Discussion paper, Working paper, 2000-05)A new approach of model parameter estimation is used with simulated measurements to recover both biological and economic input parameters of a natural resource model. The procedure efficiently combines time series of ... -
Modeling and computational techniques in bioeconomics
Ussif, Al-Amin M. (Doctoral thesis, 2000) -
Modeling the dynamics of regulated resource systems : a fishery example
Ussif, Al-Amin M. (Discussion paper, Working paper, 2000-06)In this paper we develop a discrete-time model of jointly managed fisheries. Most modern real world fisheries are shared or jointly exploited and are under some kind of regulation. The regulatory part of the fishery in ... -
A new approach of fitting biomass dynamics models to real data based on a linear total allowable catch (TAC) rule : an optimal control approach
Ussif, Al-Amin M.; Sandal, Leif Kristoffer; Steinshamn, Stein Ivar (Discussion paper, Working paper, 2000-05)A non-traditional approach of fitting dynamic resource biomass models to data is developed in this paper. The adjoint technique is an optimal control or a variational method for parameter identification. It provides a novel ... -
On the dynamics of commercial fishing and parameter identification
Ussif, Al-Amin M.; Sandal, Leif Kristoffer; Steinshamn, Stein Ivar (Discussion paper, Working paper, 2000-05)This paper has two main objectives. The first is to develop dynamic models of commercial fisheries different from the existing models. The industry is assumed to have a well defined index of performance based on which it ...