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Abstrak :
ABSTRACT
The joint optimization of condition-based opportunistic maintenance and (0,1)-type spare part inventory policy is investigated for a two-component system. Deterioration state-space partitioning (DSSP) of the observed state and the spare part inventory state is developed to analyze all the possible maintenance requirements of the system and calculate the probabilities of the actual maintenance activities with the restriction of the inventory state, as well as the probabilities of ordering and holding of spare parts. An expression of the stationary law of the joint state and its numeric solution are deduced based on an analysis of all the possible transitions of the joint state during an inspection cycle. Further, an expected long-run cost rate model of the operation of the system under the proposed policy was developed to determine the optimal joint strategy which involved a semi-regenerative process theory. Finally, numerical experiments were performed.

Abstrak :
ABSTRAK
Pengelolaan material, khususnya suku cadang, bertujuan untuk mengatur seluruh aliran material agar dapat digunakan pada kegiatan pemeliharaan untuk meminimalkan waktu downtime mesin dan mengoptimalkan penggunaan sumber daya yang dimiliki. Oleh karena itu, pengendalian persediaan suku cadang diperlukan agar kuantitas suku cadang yang disimpan dan dipesan mempunyai jumlah yang tepat, ada pada waktu yang tepat, dengan kondisi yang tepat, dan pengeluaran biaya yang ekonomis. Metode pengendalian persediaan yang digunakan adalah metode exponential smoothing dan economic order quantity. Hasil dari penelitian ini adalah total biaya persediaan hasil perhitungan menunjukkan pengurangan nilai sejumlah $1.204,94 dari biaya perusahaan. Sedangkan hasil perhitungan total biaya persediaan menunjukkan biaya stock out meningkat 6,45% dari biaya tanpa stock out.

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ABSTRACT
Material management, especially spare part, aims to control the entire flow of material in ordered to be used in maintenance activities to minimize downtime and optimize resources utility. Therefore, spare part inventory control is required to count the order quantities which are stored and have to be ordered in right amount, at the right time, with the right condition, and economical cost. Inventory control methods are exponential smoothing and economic order quantity. The result of this research is total inventory cost which shows a reduction value of $1.204,94 from actual inventory cost. Moreover, calculation of inventory show the inventory cost with stock out increases 6,45% from the cost without stock out.