Browsing Working papers (SNF) by Author "Ussif, Al-Amin M."
Now showing items 1-5 of 5
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Assimilation of time series data into a dynamic bioeconomic fisheries model : an application to the North East Arctic cod stock
Ussif, Al-Amin M.; Sandal, Leif Kristoffer; Steinshamn, Stein Ivar (Working Paper, Working paper; Working paper, 2003-01)This paper combines the elegant technique of Data Assimilation and a Monte Carlo procedure to analyze time series data for the North East Arctic Cod stock (NEACs). A simple nonlinear dynamic resource model is calibrated ... -
A bioeconomic analysis of the Norwegian spring spawning herring (Nssh) stock
Bjørndal, Trond; Ussif, Al-Amin M.; Sumaila, Ussif Rashid (Working paper, Working paper, 2003-03)A biological model, belonging to the Beverton and Holt age-structured family, for the Norwegian spring spawning herring (NSSH) is simulated, the outcome of which compares well with actual data on the fishery. This model ... -
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 (Working Paper, Working paper; Working paper, 2002-03)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 data assimilation technique is the variational ... -
On the dynamics of commercial fishing and parameter identification
Ussif, Al-Amin M.; Sandal, Leif Kristoffer; Steinshamn, Stein Ivar (Working Paper, Working paper; Working paper, 2002-03)This paper has two main objectives. The first is to develop a dynamic model of commercial fisheries different from most existing models that assume optimizing behavior. The industry is assumed to have a well-defined index ... -
Towards monitoring the world’s fishery resources using viability indices
Ussif, Al-Amin M.; Sumaila, Ussif Rashid; Bjørndal, Trond (Working paper, Working paper, 2004-05)This paper develops an easy to use and cost efficient index for the assessment of stock viability in fisheries management and bioeconomic analysis. The index is predicated on biological and economic theory, and can be ...