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All Journal Jurnal Optimasi Sistem Industri Petra International journal of Business Studies (IJBS) Jurnal INTECH Teknik Industri Universitas Serang Raya Engineering Science Letter Journal of Novel Engineering Science and Technology Journal of Management Studies and Development Journal of Integrated System

Roland Y. H. Silitonga

Institut Teknologi Harapan Bangsa

Author-ID : 3918800

Humanities Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Social Sciences Transportation

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Articles

Inventory Policy for Retail Stores: A Multi-Item EOQ Model Considering Permissible Delay in Payment and Limited Warehouse Capacity Roland Y. H. Silitonga; Ester E. L. Br Sembiring
Jurnal Optimasi Sistem Industri Vol. 21 No. 1 (2022): Published in May 2022
Publisher : The Industrial Engineering Department of Engineering Faculty at Universitas Andalas

The retail industry such as minimarkets has many products consisting of several types of products that have expiration dates. Their warehouses have limited capacity, making it difficult to make decision about optimum inventory. Most of the suppliers will give permissible delay in payment, that can be used to increase income potential through earned by considering the risk of fines imposed if payments are exceeded and help companies raise capital before generating sales. These three factors must be considered when developing the inventory model. The purpose of this study is to develop a multi-item inventory model by considering perishable or damaged products, permissible delay in payment in limited warehouse. Model development is carried out in 2 stages. The first stage was the development of a multi-item EOQ model by considering product defects and permissible delay in payment. The second stage model is by adding a capacity constraint factor to the model. The results obtained are getting the optimal order quantity by considering the number of product types, product damage factors, late payments in limited warehouses, the best ordering policy can be found, and it is known that the total inventory costs to changes in parameters are good and sensitive to changes in percentage, interest percentage, payment allowances, and warehouse capacity through sensitivity tests.

Economic Order Quantity Inventory Considering Perishable Factor in Product, Delay in Payment, All-Unit Discount, and Product Return Roland Y. H. Silitonga; Hanafi Kartawirawan; Siham Bouguern
Engineering Science Letter Vol. 1 No. 02 (2022): Engineering Science Letter
Publisher : The Indonesian Institute of Science and Technology Research

The inventory existence of the company is a waste but still needed to maintain service level. For drug industry companies, especially pharmaceutical installations, the expiration factor is a factor that needs to be considered because drugs have an expiration date. Previous research has an inventory model that considers product expiration factors, permissible payment delays, and price discounts. The developed study provides a solution to the loss of expiry costs by adding a return factor. This research aims to create an inventory model that considers expiration factors, permissible payment delays, discounts, and product returns. The result of the developed model can minimize the total cost of inventory by 3.37% with the predefined parameters compared to the previous model, which has not considered the return factor.

Safety Stock, Warehouse Capacity, and Return of Goods in Inventory Model Development Roland Y. H. Silitonga; Valyn Alanda Saputra; Aamir Khan
Journal of Novel Engineering Science and Technology Vol. 1 No. 02 (2022): Journal of Novel Engineering Science and Technology
Publisher : The Indonesian Institute of Science and Technology Research

With the increasing level of competition between companies, companies are required to be able to manage their inventory system optimally. In the pharmacy supply system, it is important to consider the uncertainty factor because the demand for medicines depends on the uncertain nature of the disease, besides that there is an expiration factor that must be considered because medicines must have an expiration date. To solve the problem of expiration, the supplier usually provides a return policy in accordance with the specified conditions. In addition, pharmacies also have limitations on warehouse capacity that must be considered. To solve the problem of limited warehouse capacity in this study, an approach to the requirements of the Karush Kuhn-Tucker method was used. From the developed model, two ordering times are obtained, namely and which will be compared to get the optimal ordering time. From the analysis of the model, it is found that the more characteristic considerations in an inventory system, the greater the total inventory cost.

The Impact of Supply Chain Management Practices on Competitive Advantage and Organizational Performance Roland Y. H. Silitonga; Marla Setiawati; Sarah E. K. Immanuella
Journal of Management Studies and Development Vol. 2 No. 01 (2023): Journal of Management Studies and Development
Publisher : The Indonesian Institute of Science and Technology Research

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56741/jmsd.v2i01.118

This study aims to examine the effect of supply chain management (SCM) on competitive advantage and company performance in the MSME culinary industry in Bandung. The subject of this research is the culinary industry MSMEs in the city of Bandung. This type of research is quantitative research using a questionnaire distributed directly to the culinary industry, with as many as 40 questionnaires. Data analysis used multiple linear regression and path analysis. The results show that supply chain management influences competitive advantage, supply chain management is not proven to affect company performance, competitive advantage affects company performance, and supply chain management affects company performance through competitive advantage but tends to have an influence—direct effect on company performance.

Analisis Kepuasan Kualitas dan Rancangan Perbaikan Pelayanan Jasa Kesehatan Priska Sugiharta; Roland Y. H. Silitonga; Marla Setiawati
Jurnal INTECH Teknik Industri Universitas Serang Raya Vol. 9 No. 2 (2023): Desember
Publisher : Universitas Serang Raya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30656/intech.v9i2.6434

Banyaknya fasilitas kesehatan yang ada di Provinsi Jawa Barat menuntut setiap rumah sakit untuk mampu memuaskan pengunjungnya dengan memberikan pelayanan terbaik agar dapat tetap bersaing. RSUD X kerap mendapatkan banyak keluhan dari pengunjung terkait dengan kualitas layanan yang diberikan. Penelitian ini bertujuan untuk mengevaluasi kualitas pelayanan RSUD X, menganalisis atribut kualitas pelayanan yang perlu mendapatkan prioritas perbaikan, serta merancang usulan perbaikan beserta prioritasnya untuk meningkatkan kualitas pelayanan pada RSUD X. Penelitian ini menggunakan metode Service Quality untuk mengevaluasi kepuasan pengunjung melalui pengukuran gap antara persepsi dan ekspektasi, metode Importance Performance Analysis untuk mengetahui atribut yang perlu diperbaiki, serta metode Quality Function Deployment untuk merancang saran perbaikan yang sesuai. Hasil analisis dengan metode Service Quality menunjukkan bahwa nilai rata-rata gap skor sebesar -1,053 yang berarti RSUD X belum dapat memenuhi kepuasan pengunjung. Terdapat 5 atribut yang menjadi prioritas utama dalam perbaikan berdasarkan hasil analisis dengan metode Importance Performance Analysis. Berdasarkan hasil analisis dengan metode Quality Function Deployment, prioritas utama perbaikan yang dapat meningkatkan kualitas layanan RSUD X adalah “rutin melakukan perapihan jam pelayanan dan rescheduling jadwal tenaga medis” dengan kontribusi sebesar 26,6%. Penerapan ketiga metode ini berhasil mendapatkan usulan perbaikan yang bersifat teknis dan dapat langsung diterapkan oleh pihak RSUD X.

Analysis of The Influence of Supplier and Government Partnerships on Hospital Supply Chain Performance Aiko Pasaribu; Roland Y. H. Silitonga; Marla Setiawati
Petra International Journal of Business Studies Vol. 7 No. 1 (2024): JUNE 2024
Publisher : Master of Management, School of Business and Management, Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9744/petraijbs.7.1.99-112

Indonesia's healthcare industry has expanded rapidly alongside population growth to 278 million by 2023, driving a notable increase in healthcare expenditure. Hospitals form the backbone of healthcare provision, Within the complex landscape of the healthcare industry, the hospital supply chain (HSC) is crucial for ensuring the timely delivery of medical resources. Partnerships may play a crucial role in improving an HSC’s overall performance. This study employs System Dynamics modeling to analyze the impact of supplier and government partnerships on HSC performance. The study extends the existing literature by incorporating both CLD and SFD methodologies to provide a more comprehensive analysis of the factors and intricacies within hospital supply chain partnerships. The findings indicate that high trust, IT integration, and hospital dynamic capabilities improve hospital supply chain performance through better information sharing and integration. Hospital demand significantly influences government regulations and control, further affecting performance. Theoretically, this study advances how dynamic interactions and feedback loops between multiple stakeholders within the HSC can be effectively modeled to gain insight and enhance healthcare supply chains.

Pengembangan Model Economic Order Quantity Multi Item dengan Mempertimbangkan All Unit Discount dan Kendala Kapasitas Roland Y. H. Silitonga; Jonah Moses
Journal of Integrated System Vol. 4 No. 1 (2021): Journal of Integrated System Vol. 4 No. 1 (Juni 2021):
Publisher : Universitas Kristen Maranatha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28932/jis.v4i1.3420

Penelitian ini mengembangkan model persediaan economic order quantity untuk multi item product dengan mempertimbangkan all unit discount dan kendala kapasitas, yang umumnya merupakan permasalahan di usaha toko seperti mini market. Pengembangan model dilakukan dengan cara mengembangkan model persediaan economic order quantity multi item dengan mempertimbangkan all unit discount dari model terdahulu, dengan menambahkan faktor kendala kapasitas, menggunakan persamaan proporsi demand produk. Model yang telah dikembangkan diuji coba menggunakan beberapa skenario perubahan parameter model, untuk mengetahui tingkat sensitivitas model yang dikembangkan. Ditemukan bahwa perubahan parameter-parameter tidak sensitif terhadap total biaya persediaan maupun waktu pemesanan. Kata kunci: economic order quantity, multi item, all unit discount, kendala kapasitas

Co-Authors Aamir Khan Aiko Pasaribu Ester E. L. Br Sembiring Hanafi Kartawirawan Jonah Moses Marla Setiawati Priska Sugiharta Sarah E. K. Immanuella Siham Bouguern Valyn Alanda Saputra

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