Pengembangan Capacity Reservation Model pada Kebijakan Persediaan Base Stock dengan Mempertimbangkan Disrupsi Pasokan

Usnadi, Isfi Nuril Izzati (2026) Pengembangan Capacity Reservation Model pada Kebijakan Persediaan Base Stock dengan Mempertimbangkan Disrupsi Pasokan. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Ketidakandalan supplier merupakan salah satu sumber risiko utama dalam sistem inventori manufaktur yang dapat menyebabkan terjadinya stockout dan meningkatkan total biaya persediaan secara signifikan. Penelitian ini mengembangkan dan membandingkan tiga model matematis inventori berbasis base-stock policy untuk menganalisis dampak disruption supplier serta mengevaluasi efektivitas strategi capacity reservation sebagai bentuk mitigasi. Model pertama adalah Benchmark Model yang merepresentasikan kondisi ideal di mana supplier selalu reliable. Model kedua adalah Unreliable Supplier Model yang merepresentasikan kondisi disruption tanpa mitigasi apapun. Model ketiga adalah Capacity Reservation Model yang mengintegrasikan kontrak reservasi kapasitas dengan backup supplier sebagai strategi mitigasi. Optimasi pada Benchmark Model dan Unreliable Supplier Model dilakukan menggunakan metode interval halving, sedangkan Capacity Reservation Model dioptimasi menggunakan metode exhaustive search karena memiliki dua variabel keputusan yang saling mempengaruhi. Hasil penelitian menunjukkan bahwa keputusan untuk menerapkan capacity reservation lebih ditentukan oleh struktur biaya sistem dibanding frekuensi disruption itu sendiri. Rasio antara biaya reservasi dan stockout cost terbukti menjadi penentu utama kelayakan strategi ini, dengan ambang batas yang konsisten di berbagai kondisi parameter. Selain itu, hubungan antara frekuensi disruption dan total biaya sistem ternyata tidak selalu berjalan searah seperti yang diperkirakan, karena sistem merespons secara adaptif dengan menyesuaikan level persediaan sehingga penghematan yang dihasilkan justru bisa melampaui tambahan biaya yang muncul.
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Supplier unreliability is one of the primary sources of risk in manufacturing inventory systems, potentially leading to stockouts and significantly increasing total inventory costs. This study develops and compares three mathematical inventory models based on base-stock policy to analyze the impact of supplier disruption and evaluate the effectiveness of capacity reservation as a mitigation strategy. The first model is the Benchmark Model, representing the ideal condition where the supplier is perfectly reliable. The second is the Unreliable Supplier Model, representing disruption conditions without any mitigation. The third is the Capacity Reservation Model, which integrates a capacity reservation contract with a backup supplier as a mitigation strategy. The Benchmark Model and Unreliable Supplier Model are optimized using the interval halving method, while the Capacity Reservation Model is optimized using exhaustive search due to its two interdependent decision variables. The results show that the decision to implement capacity reservation is driven more by the cost structure of the system than by the frequency of disruption itself. The ratio between reservation cost and stockout cost proves to be the primary determinant of this strategy's viability, with a consistent threshold across various parameter conditions. Furthermore, the relationship between disruption frequency and total system cost does not always move in the expected direction, as the system responds adaptively by adjusting inventory levels such that the resulting savings can outweigh the additional costs incurred.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	inventory management, base-stock policy, capacity reservation, supply disruption, interval halving. manajemen persediaan, kebijakan base stock, reservasi kapasitas, disrupsi pasokan, metode interval halving
Subjects:	H Social Sciences > HD Industries. Land use. Labor > HD55 Inventory control H Social Sciences > HG Finance > HG4012 Mathematical models H Social Sciences > HG Finance > HG4915 Stocks--Prices
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Industrial Engineering > 26201-(S1) Undergraduate Thesis
Depositing User:	Isfi Nuril Izzati Usnadi
Date Deposited:	31 Jul 2026 04:09
Last Modified:	31 Jul 2026 04:09
URI:	http://repository.its.ac.id/id/eprint/139983

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