论文部分内容阅读
考虑一个nt年计划期中S个采伐单元的时序安排问题,该计划期由n个采伐期组成,每个采伐期为t年。经营管理的约束条件如下:1、在采伐期j(j=1,2,…,n)中堆积垛材的产量至少为bj但不大于Cj;2、在采伐期j(j=1,2,…,n)中总更新面积至少为ej但不大于fj。对于每个采伐单元的收获,有m种经营管理方式,每种方式产生一个明确型式的木材流程并具有一个与此关联的总现值。为了将模型中的各种变量用数学式表出,特定义如下符号:Y_ijk=经理方式k下,采伐期j中采伐单
Consider the scheduling of S harvesting units in a nt year planning period consisting of n harvesting periods of t years each. The constraints of operation and management are as follows: 1. The yield of pile-stacking material in cutting period j (j = 1,2, ..., n) is at least bj but not more than Cj; 2. During the cutting period j , ..., n), the total update area is at least ej but not greater than fj. For each harvesting unit harvest, there are m management practices, each of which produces a well-defined type of timber flow and has an associated total present value. In order to formulate the various variables in the mathematical formula, the special meaning of the following symbols: Y_ijk = Manager mode k, logging felling logging in j