The literature on logging equipment replacement is inconsistent and contradictory, and none of the published methodologies purporting to optimize the replacement decision are based upon proven mathematical theories. W...
详细信息
The literature on logging equipment replacement is inconsistent and contradictory, and none of the published methodologies purporting to optimize the replacement decision are based upon proven mathematical theories. We introduce a unified theory which may be applied to the replacement of any expensive equipment, discuss its application, and derive the conditions under which it will provide a mathematical optimum. Unlike other published methodologies, our approach incorporates tax considerations as well as operating and ownership costs. The method has been tested on a small computer of the type which is becoming increasingly available even to small businesses and to individuals. Forest Sci. 27:2-12.
A method of description and optimization of the structure of hierarchical processing systems is presented. The set of feasible structures for such class of systems is defined. The representation of this set is constru...
详细信息
ISBN:
(纸本)9789955282839
A method of description and optimization of the structure of hierarchical processing systems is presented. The set of feasible structures for such class of systems is defined. The representation of this set is constructed in terms of the graph theory. For the reduced statement two types of variable parameters are defined: for the level size and for the relations of adjacent levels. The choice of variable parameters guarantees the discrete-convexity of objective function. A class of iteration methods for solving the discrete-convex programming problem is derived. The method based on the extension of discrete-convex function to the convex function and on extension of discrete-convex programming problem to the convexprogramming problem. On each step of the iteration the calculation of the value of objective function is required only on some vertices of unit cube. The considered approach is illustrated by an academic example of modelling and optimization of the structure of multi-level processing system.
暂无评论