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Capacity and UPH Improvement with Lean Tool: A Case Study of Electric Assembly Line

Authors

Vu Phuong Nam

Industrial & Systems Engineering Major, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet Street, Dien Hong Ward; Vietnam National University Ho Chi Minh City (VNU-HCM), Linh Xuan Ward, Ho Chi Minh City, Vietnam. (Vietnam)

Truong Yen Chi

Industrial & Systems Engineering Major, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet Street, Dien Hong Ward; Vietnam National University Ho Chi Minh City (VNU-HCM), Linh Xuan Ward, Ho Chi Minh City, Vietnam. (Vietnam)

Truong Anh Tham

Industrial & Systems Engineering Major, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet Street, Dien Hong Ward; Vietnam National University Ho Chi Minh City (VNU-HCM), Linh Xuan Ward, Ho Chi Minh City, Vietnam. (Vietnam)

Ngo Nam Trung

Industrial & Systems Engineering Major, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet Street, Dien Hong Ward; Vietnam National University Ho Chi Minh City (VNU-HCM), Linh Xuan Ward, Ho Chi Minh City, Vietnam. (Vietnam)

And Do Ngoc Hien

Industrial & Systems Engineering Major, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet Street, Dien Hong Ward; Vietnam National University Ho Chi Minh City (VNU-HCM), Linh Xuan Ward, Ho Chi Minh City, Vietnam. (Vietnam)

Article Information

DOI: 10.51583/IJLTEMAS.2026.150800111

Subject Category: Education

Volume/Issue: 15/8 | Page No: 1547-1556

Publication Timeline

Submitted: 2026-09-03

Accepted: 2026-09-08

Published: 2026-09-19

Abstract

The economic environment is becoming more competitive as the modern world develops. For this reason, it is crucial for manufacturing companies to continuously improve, optimize processes, and reduce costs to outperform their rivals. Lean manufacturing is known as a good way for the great majority of companies. In this study, lean technology to enhance a production line for family products with rechargeable items would be mentioned. Lean tools and other suitable methods like line balancing, Maynard Operation Sequencing Technique (MOST), Define – Measure – Analyze – Improve – Control (DMAIC) cycle and work elements would be used to detect waste and non-value added, improving, and decreasing production time while ensuring product quality. As a good practical result, units per hour (UPH) factor increased from 48 to 90, units person per hour (UPPH) factor from 5.3 to 6.0, and saving the business $28,000 annually.

Keywords

Lean Manufacturing, Lean Line balancing, DMAIC, MOST, UPH, UPPH.

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