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Pengembangan Model Persediaan Continuous Review dengan All-Unit Discount dan Faktor Kadaluwarsa Rikardo, Cherish; Lesmono, Dharma; Limansyah, Taufik
Jurnal Teknik Industri Vol 19, No 1 (2017): JUNE 2017
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (593.499 KB) | DOI: 10.9744/jti.19.1.29-38

Abstract

Paper ini membahas suatu model matematika untuk suatu sistem persediaan dengan mempertimbangkan adanya all-unit discount dan faktor kadaluwarsa. Permintaan barang bersifat deterministik yang merupakan fungsi dari waktu dan bergantung pada jumlah persediaan yang ada (inventory dependent demand), laju kadaluwarsa barang juga bergantung pada waktu dan tidak ada lead time. Model yang dibahas merupakan pengembangan dari Nagare dan Dutta [9] dengan menambah faktor all-unit discount dan laju kadaluwarsa yang bergantung pada waktu. Dari model yang dikembangkan akan ditentukan kuantitas pemesanan (economic order quantity) dan waktu antar pemesanan yang optimum yang meminimumkan total biaya persediaan tahunan. Algoritma penentuan solusi optimum dari model yang dikembangkan dan contoh numerik sebagai ilustrasi dari permasalahan persediaan ini diberikan. Analisis sensitivitas model dengan melihat pengaruh laju kadaluwarsa dan laju permintaan terhadap kuantitas dan waktu antar pemesanan yang optimal juga diberikan. Dari hasil analisis sensitivitas diperoleh bahwa semakin besar laju kadaluwarsa, maka waktu antar pemesanan menjadi semakin singkat dan kuantitas pemesanan menjadi semakin sedikit.  Hal yang sama terjadi jika laju permintaan barang semakin besar.   Kata kunci:  Persediaan, kadaluwarsa, all-unit discount.
Optimizing Inventory for Chicken Egg Livestock Industry Cherish Rikardo; Alfian Tan; Paulina Kus Ariningsih
Jurnal Rekayasa Sistem Industri Vol. 8 No. 1 (2019): Jurnal Rekayasa Sistem Industri
Publisher : Universitas Katolik Parahyangan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (797.09 KB) | DOI: 10.26593/jrsi.v8i1.3089.1-8

Abstract

This study is to give an alternative of an optimum inventory model for chicken egg livestock industry. The characteristic of the egg livestock industry is very unique; since the chicken breeding performance varies. In a particular span of time, the industry might have ameliorating and deteriorating characteristics. Some farmers nourish several generations at the same time. This study generates a mathematical model to optimize the length time between purchases of a chicken generation to get optimum cost by considering demand seasonality. This study is also generating the algorithm to find the optimum solution in a simple way. Future potential researches are also stated.Keywords: Optimization, inventory, egg, chicken, ameliorating
Studi Eksplorasi Faktor yang Mempengaruhi Keberlanjutan Pemakaian Layanan Mobile Payment Alfian Tan; Paulina Kus Ariningsih; Cherish Rikardo
Jurnal Optimasi Sistem Industri Vol. 19 No. 1 (2020): Published in June 2020
Publisher : The Industrial Engineering Department of Engineering Faculty at Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (351.409 KB) | DOI: 10.25077/josi.v19.n1.p59-69.2020

Abstract

This research explores some potential factors that affect the continuance intention of a mobile payment service. The trend of mobile payment services has been increasing since the last few years. The advancing technology of the internet and smartphone has been a supporting environment for the growth of this method. Many similar mobile payment services are offered in the community which results in a highly competitive business condition. The business owner who has put a high investment in this business will surely want to keep it running and even grow their product. Therefore, some knowledge of factors that can significantly promote the sustained use of their product to customers will be imperative. In this research, some existing models on the general repurchase intention concept and users’ continuance intention will be combined and tested to figure out some influential aspects to continuance intention concept. Seven factors are hypothesized to have direct and indirect effects. Data from 193 respondents are gathered and the results of the tested model shows perceived quality, perceived value, and brand preference subsequently influence the continuance intention. Further analysis is also conducted in this research to explain the relationship between factors as well as analysis of current mobile payment providers.
Integrated Inventory Model for Single Vendor Multi-Buyer with a Single Item by Considering Warehouse and Capital Constraint Agustiandi Agustiandi; Yoon Mac Kinley Aritonang; Cherish Rikardo
Jurnal Teknik Industri Vol. 22 No. 1 (2021): February
Publisher : Department Industrial Engineering, University of Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (413.293 KB) | DOI: 10.22219/JTIUMM.Vol22.No1.71-84

Abstract

Integrated inventory management coordinates all party's replenishment policies to provide optimal benefits. Many models have been developed, but none of them have considered capital and warehouse constraints comprehensively. It may cause the model which cannot be applied, since it has exceeded the capacity. This study developed an integrated inventory model that consisted of one vendor, multi-buyer, and one type of item. The main objective was to minimize the joint total expected cost by considering warehouse, capital, and service level constraint. The optimal formula was constructed by using the Lagrange multipliers method.  The results showed that with an increment in holding cost, the vendor tends to reduce lot size to minimize joint total expected cost. It is vice versa to the increment in set up cost. An increment in buyer service level can increase lot size and reduce order frequency. The buyer capacity is essential to determine its capability to apply the optimal replenishment policy.
MODEL PERSEDIAAN DETERMINISTIK DENGAN MEMPERTIMBANGKAN MASA KADALUARSA DAN PENURUNAN HARGA JUAL Cherish Rikardo; Taufik Limansyah; Dharma Lesmono
Prosiding Semnastek PROSIDING SEMNASTEK 2015
Publisher : Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Persediaan merupakan salah satu faktor yang berperan besar dalam berjalannya suatu proses di perusahaan. Persediaan telah menjadi topik yang banyak diteliti dan dikembangkan dengan mempertimbangkan beberapa kondisi tertentu, seperti masa kadaluarsa. Pada penelitian ini akan dibahas mengenai suatu model matematis persediaan yang mempertimbangkan waktu kadaluarsa tertentu dan penurunan harga jual dari barang yang akan mengalami kadaluarsa. Pada penelitian ini, diasumsikan bahwa permintaan bersifat deterministik dan penurunan harga jual yang dilakukan dapat meningkatkan permintaan dari barang yang mendekati waktu kadaluarsa. Dalam penelitian ini akan dikembangkan suatu model matematis untuk menentukan  kuantitas barang yang dibeli, dan pada tingkat persediaan berapa penurunan harga dapat dilakukan yang meminimumkan total biaya persediaan tahunan.
Pengembangan Model Persediaan Continuous Review dengan All-Unit Discount dan Faktor Kadaluwarsa Cherish Rikardo; Dharma Lesmono; Taufik Limansyah
Jurnal Teknik Industri Vol. 19 No. 1 (2017): JUNE 2017
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (593.499 KB) | DOI: 10.9744/jti.19.1.29-38

Abstract

Paper ini membahas suatu model matematika untuk suatu sistem persediaan dengan mempertimbangkan adanya all-unit discount dan faktor kadaluwarsa. Permintaan barang bersifat deterministik yang merupakan fungsi dari waktu dan bergantung pada jumlah persediaan yang ada (inventory dependent demand), laju kadaluwarsa barang juga bergantung pada waktu dan tidak ada lead time. Model yang dibahas merupakan pengembangan dari Nagare dan Dutta [9] dengan menambah faktor all-unit discount dan laju kadaluwarsa yang bergantung pada waktu. Dari model yang dikembangkan akan ditentukan kuantitas pemesanan (economic order quantity) dan waktu antar pemesanan yang optimum yang meminimumkan total biaya persediaan tahunan. Algoritma penentuan solusi optimum dari model yang dikembangkan dan contoh numerik sebagai ilustrasi dari permasalahan persediaan ini diberikan. Analisis sensitivitas model dengan melihat pengaruh laju kadaluwarsa dan laju permintaan terhadap kuantitas dan waktu antar pemesanan yang optimal juga diberikan. Dari hasil analisis sensitivitas diperoleh bahwa semakin besar laju kadaluwarsa, maka waktu antar pemesanan menjadi semakin singkat dan kuantitas pemesanan menjadi semakin sedikit.  Hal yang sama terjadi jika laju permintaan barang semakin besar.   Kata kunci:  Persediaan, kadaluwarsa, all-unit discount.
The Supply Chain Integrated Inventory Model for Single Product, Multi-Buyer and Multi-Vendor Kinley Aritonang; Cynthia Prithadevi Juwono; Cherish Rikardo; Fran Setiawan; Adrianus Vincent Djunaidi
International Journal of Supply Chain Management Vol 9, No 6 (2020): International Journal of Supply Chain Management (IJSCM)
Publisher : International Journal of Supply Chain Management

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

This paper presents an extended integrated inventory model with multi vendors that produce one item product and supply it to multi buyers. It is assumed that vendor production rates are not equal and the demands of buyers assumed to be normally distributed and independent. The model formulation was made for each buyer and vendor. Then, each cost component from the buyer and vendor is combined to form the total inventory costs. This model uses the service level as constraint. The final mathematical model consists of formulations of the total inventory costs and with certain service level.