An efficient optimizing model for determining thinning regime and rotation age using the stand projection system growth simulator Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/73666664q

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  • The PATH algorithm, which is the efficient dynamic programming algorithm developed by Paredes and Brodie (1987) was interpreted from a different point of view. This modification of the PATH algorithm by the calculus of variations vastly diminished the calculation task and memory required to store optimal stands at each stage. Using the PATH algorithm, a new dynamic programming model called Stand Optimization System (SOS) was developed. The system was incorporated into a growth simulator constructed by Arney (1985). This model optimizes timing, intensity, and type of thinning as well as rotation age based on either physical units (basal area, cubic feet, merchantable cubic feet, merchantable board feet), present net worth, or soil expectation value. An economic analysis with Stand Optimization System was performed so as to evaluate the impacts of interest rate, quality premium and type of thinning. Finally, further limitation of optimality on the PATH algorithm and the relationship between the Lagrange multiplier and the decision variable were discussed.
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