Optimasi Joint Economic Lot Size Dalam Sistem Persediaan Supplier-Buyer Ketika Terdapat Penawaran Decremental Temporary Discount

Sari, Diana Puspita (2008) Optimasi Joint Economic Lot Size Dalam Sistem Persediaan Supplier-Buyer Ketika Terdapat Penawaran Decremental Temporary Discount. Masters thesis, Institut Teknologi Sepuluh November.

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Abstract

Supplier sering menawarkan pengurangan harga kepada buyer dalam jangka waktu tertentu sebagai bagian dari strategi operasional dalam hubungan supplier-buyer. Dalam kondisi ini, buyer dapat meningkatkan efektivitas sistem persediaannya dengan melakukan pemesanan dalam jumlah khusus (special order quantity). Joint economic lot size merupakan salah satu mekanisme untuk mengendalikan keseimbangan dalam supply chain. Penelitian ini mengembangkan model matematis untuk optimasi joint economic lot size dalam sistem persediaan supplier-buyer ketika supplier menawarkan decremental temporary discounts selama periode promosi. Periode promosi terdiri atas n tahap dengan tingkat diskon yang semakin menurun pada setiap tahap. Diskon tertinggi diberikan ketika pemesanan dilakukan pada tahap awal, sedangkan diskon terendah diberikan ketika pemesanan dilakukan pada tahap akhir. Dalam situasi ini, supplier cenderung mendorong buyer untuk melakukan pemesanan sedini mungkin selama periode promosi. Buyer merespons penawaran tersebut dengan melakukan pemesanan dalam jumlah khusus pada salah satu tahap. Penelitian ini mengusulkan dua model yang berbeda berdasarkan rentang waktu setiap tahap dengan distribusi nilai diskon yang proporsional. Pada model pertama, rentang waktu setiap tahap bersifat seragam, sedangkan pada model kedua, rentang waktu setiap tahap bersifat inkremental, yaitu semakin tinggi tahap, semakin panjang rentang waktunya. Untuk mengevaluasi kinerja model, digunakan contoh numeris dengan tiga tahap tingkat diskon dan dilakukan perbandingan total biaya gabungan pada setiap tahap ketika pemesanan khusus dilakukan. Hasil penelitian menunjukkan bahwa model terintegrasi menghasilkan total biaya gabungan yang lebih rendah dibandingkan dengan model independen. Analisis perilaku model menunjukkan bahwa perubahan rentang waktu dan peningkatan nilai diskon memengaruhi keputusan mengenai waktu pelaksanaan pemesanan khusus serta ukuran pemesanan khusus.
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Suppliers often offer temporary price reductions to buyers as part of their operational strategy in supplier-buyer relationships. Under these conditions, buyers can improve the effectiveness of their inventory systems by placing special orders during the promotional period. Joint economic lot sizing is a mechanism for maintaining balance within a supply chain. This research develops mathematical models for joint economic lot size optimization in a supplier-buyer inventory system when the supplier offers decremental temporary discounts during a promotional period. The promotional period consists of n phases, with the discount level decreasing progressively from one phase to the next. The highest discount is offered when an order is placed during the first phase, whereas the lowest discount is offered when an order is placed during the final phase. Under these conditions, the supplier tends to encourage the buyer to place an order as early as possible during the promotional period. The buyer responds to this offer by placing a special order quantity in one of the phases. This study proposes two models that differ in terms of the duration of each phase, with discount levels distributed proportionally. In the first model, the duration of each phase is uniform, whereas in the second model, the duration is incremental, meaning that the higher the phase, the longer its duration. To evaluate the performance of the models, a numerical example with three discount levels is used, and the total joint cost associated with placing a special order in each phase is compared. The results demonstrate that the integrated model produces a lower total joint cost than the independent model. Analysis of the model behavior indicates that changes in phase duration and increases in discount levels affect the decision regarding when to place a special order and the corresponding special order quantity.

Item Type:	Thesis (Masters)
Additional Information:	RTI 658.5 Sar o
Uncontrolled Keywords:	decremental temporary discount, joint economic lot size, persediaan
Subjects:	H Social Sciences > HD Industries. Land use. Labor > HD38.5 Business logistics--Cost effectiveness. Supply chain management. ERP
Divisions:	Faculty of Industrial Technology > Industrial Engineering > 26101-(S2) Master Thesis
Depositing User:	magang .
Date Deposited:	29 Sep 2026 07:17
Last Modified:	29 Sep 2026 07:17
URI:	http://repository.its.ac.id/id/eprint/145025

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