Blar i NHH Brage på forfatter "Sandal, Leif Kristoffer"

A bridge between continuous and discretetime bioeconomic models: Seasonality in fisheries
Kvamsdal, Sturla F; Maroto, Jose M.; Moran, Manuel; Sandal, Leif Kristoffer (Journal article; Peer reviewed, 2017)We develop a discretization method to construct a discrete finitetime bioeconomic model, corresponding to bioeconomic models with continuoustime growth function, but allowing the analysis of seasonality in fisheries. The ... 
A maximum entropy approach to the newsvendor problem with partial information
Andersson, Jonas; Jörnsten, Kurt; Nonås, Sigrid Lise; Sandal, Leif Kristoffer; Ubøe, Jan (Journal article; Peer reviewed, 2013)In this paper, we consider the newsvendor model under partial information, i.e., where the demand distribution D is partly unknown. We focus on the classical case where the retailer only knows the expectation and variance ... 
A maximum entropy approach to the newsvendor problem with partial information
Andersson, Jonas; Jörnsten, Kurt; Nonås, Sigrid Lise; Sandal, Leif Kristoffer; Ubøe, Jan (Discussion paper;2011:14, Working paper, 201108)In this paper, we consider the newsvendor model under partial information, i.e., where the demand distribution D is partly unknown. We focus on the classical case where the retailer only knows the expectation and variance ... 
A stitch in time saves nine : the costs of postponing action in climate policy
Steinshamn, Stein Ivar; Kvamsdal, Sturla Furunes; Sandal, Leif Kristoffer (Report;2011:16, Research report, 2011)The main purpose of this report is to investigate the effects of postponing implementation of a carbon tax assuming that externalities associated with climate change and global warming is real. Failing to internalize these ... 
Adaptive regulation with flow and stock externalities
Sandal, Leif Kristoffer; Steinshamn, Stein Ivar (Discussion paper, Working paper, 199801)In confronting a consumer good whose production process is associated with both flow and stock externalities, a corrective tax is introduced to restore efficiency. The objective is to maximize social welfare over time when ... 
An analysis of maintenance schedules for public facilities
Hopland, Arnt Ove; Kvamsdal, Sturla F; Sandal, Leif Kristoffer (Journal article; Peer reviewed, 2019)We present a flexible, formal framework for maintenance scheduling for public facilities. Key features of the model include an accelerating deterioration scheme, a general utility measure, and real estate market effects ... 
Analyzing risk of stock collapse in a fishery under stochastic profit maximization
Poudel, Diwakar; Sandal, Leif Kristoffer; Kvamsdal, Sturla Furunes (Discussion paper;2012:4, Working paper, 201204)In commercial fisheries, stock collapse is an intrinsic problem caused by overexploitation or due to pure stochasticity. To analyze the risk of stock collapse, we apply a relatively simple Monte Carlo approach which can ... 
An approach to adaptive carbon taxes in the presence of global warming
Sandal, Leif Kristoffer; Steinshamn, Stein Ivar (Discussion paper, Working paper, 199801)The optimal extraction path of fossil fuels and the corresponding corrective tax on extraction are derived when two types of externalities associated with emission of carbondioxide (CO2) are taken into account. The optimal ... 
Approximating closed form solutions to a class of feedback policies
Sandal, Leif Kristoffer (Discussion paper, Working paper, 200909)Dynamic optimization problems cover a large class of problems in theoretical and applied economics. A simple iterative algorithm with fast convergence is proposed. It is demonstrated that the algorithm in a few steps ... 
Assimilation of real time series data into a dynamic bioeconomic fisheries model : an application to the Norwegian cod fishery stock
Ussif, AlAmin M.; Sandal, Leif Kristoffer; Steinshamn, Stein Ivar (Discussion paper, Working paper, 200005)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 ... 
Assimilation of time series data into a dynamic bioeconomic fisheries model : an application to the North East Arctic cod stock
Ussif, AlAmin M.; Sandal, Leif Kristoffer; Steinshamn, Stein Ivar (Working Paper, Working paper; Working paper, 200301)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 ... 
Comparative evaluation of the fisheries policies in Denmark, Iceland and Norway : multispecies and stochastic issues
Agnarsson, Sveinn; Arnason, Ragnar; Johannsdottir, Karen; RavnJonsen, Lars; Sandal, Leif Kristoffer; Steinshamn, Stein Ivar; Vestergaard, Niels (Report, Research report, 200801)In this report the fisheries policies in Denmark, Iceland and Norway are subject to evaluation in a comparative perspective with particular emphasis on multispecies interaction and uncertainty. The actual harvest and ... 
Continuous harvesting costs in soleowner fisheries with increasing marginal returns
Sandal, Leif Kristoffer; Steinshamn, Stein Ivar; Maroto, Jose M.; Moran, Manuel (Working paper, Working paper, 200906)We develop a bioeconomic model to analyze a soleowner fishery with fixed costs as well as a continuous cost function for the generalized CobbDouglas production function with increasing marginal returns to effort level. ... 
Continuous harvesting costs in soleowner fisheries with increasing marginal returns
Maroto, Jose M.; Moran, Manuel; Sandal, Leif Kristoffer; Steinshamn, Stein Ivar (Discussion paper, Working paper, 200909)We develop a bioeconomic model to analyze a soleowner fishery with fixed costs as well as a continuous cost function for the generalized CobbDouglas production function with increasing marginal returns to effort level. ... 
Data assimilation into biomass dynamics models : a Monte Carlo simulation experiment
Ussif, AlAmin 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 ... 
Do species interactions and stochasticity matter to optimal management of multispecies fisheries?
Poudel, Diwakar; Sandal, Leif Kristoffer; Steinshamn, Stein Ivar; Kvamsdal, Sturla Furunes (Discussion paper;2012:1, Working paper, 201201)The multispecies fisheries management looks at a bigger picture in addressing the longterm consequences of present decisions. This implies an ecosystem management that includes a number of species and their physical, ... 
Does stochasticity matter? : dynamic pigouvian taxation in an uncertain environment
Sandal, Leif Kristoffer; Steinshamn, Stein Ivar (Discussion paper, Working paper, 200404)The effects of discounting, stochasticity, nonlinearities and maximum decay upon an optimal corrective tax are analyzed using stochastic dynamic optimization. Optimal corrective taxes are derived as explicit feedback ... 
Dynamic cournotcompetitive harvesting of a common pool resource
Sandal, Leif Kristoffer; Steinshamn, Stein Ivar (Working Paper, Working paper; Working paper, 200301)A variant of the classical harvesting game, where a number of competing agents simultaneously harvest a commonpool natural resource, is analysed. The harvesting at each time is a Cournot competition. The critical assumption ... 
Dynamiske adaptive miljøavgifter
Sandal, Leif Kristoffer; Steinshamn, Stein Ivar (Rapport, Research report, 200104)Optimale CO2avgifter finnes som en feedbackrelasjon ved hjelp av dynamisk optimering. Objektfunksjonen er å maksimere velferden som består av summen av konsument og produsentoverskudd i markedet for fossilt brennstoff ... 
Dynamiske CO2avgifter : en modell med endogent bestemt avgiftsperiode
Aanestad, Sigurd; Sandal, Leif Kristoffer; Berge, Gerhard (Discussion paper, Working paper, 200312)