02100nas|a2200253 i 450000500170000000800410001703500150005810000290007324500690010226000520017130000100022349000520023350001520028550200840043752009410052165000180146270000350148070000530151570000400156870000530160871000360166181000840169785600650178120260817162846.0121095s1985    th uu m rtt  00|  a1eng d  a.b100704361 aMaarif, Mohammad Syamsul13aAn application of control theory to rubber plantation management  aBangkok :bAsian Institute of Technology,c1985  a62 p.1 aResearch studies project report ;vno. IE-85-11  aA research study submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology  aResearch Studies Project Report (M. Eng.) - Asian Institute of Technology, 1985  aThe problem of rubber plantation management is  formulated as a problem in control theory . The production of rubber trees depend on  intra-rotation activities  (maintenance ), stocking density, and the age of rubber  trees.  Th e objective of t h is study is to maximize the present  value of all the future net profits over a class of in finite  chain of rotation where each link in the cha in represents a  uniform length rotation with identical intra-rotation  activities. The optimal control is determined by applying  the Pontryagin's Maximum Principle. Since data on effects of  maintenance to the production is difficult to get,  qualitative analysis is used in applying the control model .  By using present value comparisons , the optimal  rotation time T, stocking density So , and the age of  restocked trees To are determined. The optimal tapping  system is also determined by choosing the most profit able  tapping system. 0aRubber plants1 aClarke Harry R., eChairperson1 aOudheusden, Dirk L. van, eExamination Committee1 aVrat, Prem, eExamination Committee1 aSauter-Servaes, Florian, eExamination Committee2 aUS - ASEAN, eScholarship Donor2 aAsian Institute of Technology.tResearch studies project report ;vno. IE-85-11  3Full-Textuhttp://203.159.5.9/ait-thesis/detail.php?q=B19885