Isna Nugraha
Industrial Engineering Department, Faculty of Engineering and Science, Universitas Pembangunan Nasional “Veteran” Jawa Timur

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Analysis and Optimization of Warehouse Sustainability Using the Sustainable Value Stream Mapping (SUS-VSM) Method at PT XYZ Friska Aryanti; Farida Pulansari; Isna Nugraha
EPI International Journal of Engineering Vol 8 No 2 (2025): Volume 8 Number 2, August 2025
Publisher : Center of Techonolgy (COT), Engineering Faculty, Hasanuddin University

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Abstract

Warehouse operations are a critical component of the supply chain system as they manage material flow before entering the production process. The Central Warehouse handles high-volume material operations, requiring an efficient and sustainable warehousing system to support Environmental, Social, and Governance (ESG) targets and the Net Zero Emission 2060 initiative. This study aims to analyze and optimize sustainable warehouse processes using the Sustainable Value Stream Mapping (SUS-VSM) method integrated with RFID technology. The research methodology includes mapping the current state of SUS-VSM, classifying activities into value-added (VA), necessary non-value-added (NNVA), and non-value-added (NVA), waste analysis, root cause identification using the Five-Whys method, and designing the future state of SUS-VSM. The results indicate that the total lead time of the warehouse process is 4,516.31 minutes, with a value-added time of 36.59 minutes and a Process Cycle Efficiency (PCE) of 0.81%. The dominant wastes identified include waiting, transportation, motion, inventory, and overprocessing, which are caused by the lack of system integration, reliance on physical documents, and manual verification processes. Proposed improvements such as the implementation of RFID, a Warehouse Management System (WMS), document digitalization, and material flow optimization reduce lead time to 4,395.19 minutes and increase PCE to 0.83%, while also improving sustainability indicators including waste efficiency, energy process, safety, and time efficiency. The findings demonstrate that the implementation of RFID-based SUS-VSM enhances warehouse operational efficiency while supporting sustainable warehousing systems.
Determination of Sustainable Supply Chain Strategy in Natural Gas Transition as a Substitute for Subsidized Household LPG Using FAHP and TOPSIS Method Avriska Padmasari; Isna Nugraha
EPI International Journal of Engineering Vol 8 No 2 (2025): Volume 8 Number 2, August 2025
Publisher : Center of Techonolgy (COT), Engineering Faculty, Hasanuddin University

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Abstract

The high dependency on subsidized LPG imports and the increasing demand for cleaner energy encourage the utilization of natural gas as an alternative household energy source in Indonesia. This study aims to determine the most appropriate sustainable supply chain strategy in supporting the transition of natural gas as a substitute for subsidized household LPG at Company XYZ. The research applies a Multi-Criteria Decision Making approach using Fuzzy Analytical Hierarchy Process (FAHP) and Technique for Order Preference by Similarity to Ideal Solution (TOPSIS). FAHP is used to determine the weight of criteria based on economic, environmental, and social aspects, while TOPSIS is applied to rank the alternative strategies. The results indicate that the strategy of infrastructure integration and gas distribution efficiency achieved the highest preference value of 0.9712, making it the most recommended strategy. The selected strategy is considered capable of improving distribution efficiency, expanding household gas network utilization, and reducing dependency on subsidized LPG. Therefore, the implementation of sustainable supply chain management in the gas sector can support energy transition and improve the effectiveness of household gas distribution systems.