PENGENDALIAN PERSEDIAAN CENGKEH UNTUK PRODUKSI ROKOK DENGAN PENDEKATAN PROGRAM DINAMIS : SUATU STUDI KASUS DI PT. GANDUM MALANG
ABSTRACT: The research aim was
to plan a monthly optimum level of clove used for cigarette production in the
period from September 2003 to August 2004 and to estimate its total inventory
cost, employing a dynamic programming approach. The research was divided into two
stages. The first one was analysis to forecast a monthly clove used and then
followed by an inventory analysis using a dynamic programming approach.
The calculation was based on predetermined costs on clove i.e. Rp
45,000/kg (a purchasing cost), Rp 38,800/order (an ordering cost) and Rp 47/kg
of a holding cost. The backward recursive equation for the dynamic programming
approach was expressed as: fj(Xj) = 45000(Xj) + 38800 + 47(Xj+Sj-1-Dj) +
fj-1(Xj-1), with the following constraints: Xj + Sj-1 ≤ G, Xj + Sj-1 ≥ Dj and
Xj ≥ 0.
An optimization using a dynamic programming approach showed that total
inventory cost during the planned period was Rp 435,415,516,791 with an ending
inventory of 3,058 kg of clove. It was found that the use of such an approach
for PT.Gandum eventually reduced the total inventory cost of clove by Rp
514,577,099. The sensitivity analysis also indicated that the model was still
valid for the monthly clove need up to 1,600 kg.
Key words: inventory control,
dynamic programming, cigarette production
Penulis: Arif Hidayat, Siti
Asmaul Mustaniroh
Kode Jurnal: jppertaniandd050031
