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All Journal JIMEK Optimal: Jurnal Ekonomi dan Manajemen
Ma’ruf Ma’ruf
Universitas Pendidikan Indonesia
Economics, Econometrics & Finance

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Penerapan Metode Peramalan Dalam Pengendalian Persediaan Pipa UPVC di PT XYZ Zabrina Salsabila Salma; Ma’ruf Ma’ruf; Melia Handayani
OPTIMAL Jurnal Ekonomi dan Manajemen Vol. 6 No. 1 (2026): Jurnal Ekonomi dan Manajemen
Publisher : Lembaga Pengembangan Kinerja Dosen

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55606/optimal.v6i1.9105

Abstract

This study aims to enhance the efficiency of inventory control for uPVC AW 3/4inch pipe products at PT XYZ by applying time series forecasting methods using historical sales data. Three forecasting approaches were tested, Double Exponential Smoothing, Holt Winters Multiplicative, and Seasonal Autoregressive Integrated Moving Average (SARIMA). The accuracy of each model was evaluated using Mean Absolute Percentage Error (MAPE), Mean Absolute Deviation (MAD), and Mean Squared Error (MSE) to determine the most reliable forecasting result. The analysis showed that SARIMA model produced the smallest error value, indicating the best level of accuracy. The forecasting output from this model was then used as a basis for calculating safety stock, reorder point, and maximum stock levels to improve inventory control decisions. The finding indicate that databased forecasting helps PT XYZ align production quantities with actual market demand, reducing overstock conditions and optimizing warehouse capacity utilization. This research highlights the importance of applying quantitative forecasting methods to strengthen data driven decision making in inventory management and provides practical insights for manufacturing companies seeking to improve operational efficiency.
Implementasi Lean Warehouse terhadap Produktivitas Operasional Pengiriman di PT. ABC Fadila Ainur Rahma; Ma’ruf Ma’ruf; Wenny Ananda Larasati
Jurnal Ilmu Manajemen, Ekonomi dan Kewirausahaan Vol. 6 No. 1 (2026): Maret: Jurnal Ilmu Manajemen, Ekonomi dan Kewirausahaan (JIMEK)
Publisher : Lembaga Pengembangan Kinerja Dosen

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55606/jimek.v6i1.9994

Abstract

This study aims to analyze the level of lean warehouse implementation and the dominant aspects that can affect the productivity of shipping operations at PT. ABC. The approach adopted in this study is quantitative descriptive by distributing questionnaires to respondents involved in shipping operations both in administration and in the field. The results obtained that the level of lean warehouse implementation reached 55.17%, which indicates that most lean warehouse aspects have been implemented but are not optimal in some aspects. The dimensions of motion, waiting, overprocessing, transportation, and flow management are still in the "less good" category, while defects and HRM are classified as "good". This condition is at the level of shipping operational productivity which only reached 53%. The lean warehouse aspects that most dominantly affect productivity are waiting and motion, which are related to punctuality as well as the arrangement and quantity of work in the warehouse. This study provides recommendations for improving lean warehouse implementation, especially in dimensions that are still less than optimal. Improving process arrangement and reducing waiting time will increase overall efficiency and productivity, thereby influencing company performance in achieving better operational goals.
Co-Authors Fadila Ainur Rahma Melia Handayani Wenny Ananda Larasati Zabrina Salsabila Salma