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EPI International Journal of Engineering
Published by Universitas Hasanuddin
ISSN : 26155109     EISSN : 26210541     DOI : https://doi.org/10.25042/epi-ije
Core Subject : Science, Engineering,
Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Engineering
EPI International Journal of Engineering (EPI-IJE) is published and managed by Center of Technology, Faculty of Engineering, University of Hasanuddin (CoT, FoE, UNHAS), Indonesia. The main objective of this international journal is to create publishing opportunities and to disseminate knowledge in engineering-related topics collected from all over the world. A wide range of topics may be accepted, including from both conventional engineering and newly developed fields. Multi-disciplinary and Inter-disciplinary fields are encouraged to submit, and the topic on engineering education is also welcome. Manuscripts should be in English only. This journal system is open free-access to public in electric form, and the paper-form journal is also available. No fee is charged to accepted papers. On acceptance of submitted paper, authors are asked to submit a short copy-right form, but the authors have rights to reuse their work. The submitted manuscripts are under peer review at least by two reviewers, and publication is made biannually.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 178 Documents
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Thermal Performance of De’diba Kulong Ruma Bulongan for Residents Comfort Icha Anggriani; Ria Wikantari; Baharuddin Hamzah
EPI International Journal of Engineering Vol 8 No 1 (2025): Volume 8 Number 1, Februari 2025
Publisher : Center of Techonolgy (COT), Engineering Faculty, Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25042/epi-ije.022025.07

Abstract

The Bulungan Stilt House which in local language is called De’diba Kulong Ruma Bulongan has various floor heights of around 30cm, 50cm and 100cm. The difference in stilted floor height is expected to yield different thermal performance that affects occupant comfort. This study aims to: (1) explain the architectural characteristics of De’diba Kulong Ruma Bulongan and the existing conditions of thermal comfort of the occupants, and (2) analyze the effect of the floor height of De’diba Kulong Ruma Bulongan on the thermal comfort based on measurements and occupants perceptions, (3) explain the floor height performance on occupant thermal comfort as a function of climatic and environmental conditions. This research is quantitative, with a survey method using both qualitative and quantitative data. Data were collected through observation, thermal measurements, and distribution of questionnaires to 43 respondents who lived in 9 samples of Bulungan stilt houses. The analysis technique used PMV and PPD through the CBE thermal comfort tools, as well as cross-tabulation of questionnaire data. The results of the analysis of the psychrometric chart and the effective temperature chart at 13:00–14:00 WITA show that the highest average effective temperature in all measured stilt houses is in the range of 25.5-29°C. PMV analysis using the CBE thermal comfort tool shows that houses on stilts are most compliant with Ashrae 55 at a height of 100cm with PMV = 0.02 and PPD feel 5 % of a neutral value with an operating temperature of 25.5 - 27°C. Questionnaire analysis shows the most comfortable thermal reception according to the respondent’s characteristics, namely occupants who are women, elderly (> 54 years old), and those who wear long loose gowns called gamis. The analysis of the occupants' perception shows that the most comfortable thermal reception at the four measurement points of the house on stilts is a house on stilts with a height of subsequently 100, 50, and 30 cm. This study concludes that the floor height affects thermal comfort in which the higher the stilted floor height in the architecture of the De'diba Kulong Ruma Bulongan the more comfortable for the occupants. This study also verifies that thermal comfort is influenced by climatic and environmental conditions.
Characteristics Of Filament From Extrusion Result Of Low Density Polythylene Plastic Waste Using Extrusion Method For 3d Printing Filament Applications Muhammad Ali Chandra; Onny Sutresman; Fauzan Djamaluddin
EPI International Journal of Engineering Vol 8 No 1 (2025): Volume 8 Number 1, Februari 2025
Publisher : Center of Techonolgy (COT), Engineering Faculty, Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25042/epi-ije.022025.08

Abstract

Low-Density Polyethylene (LDPE) plastic is a material that is widely used by the industry as packaging. Worse, the manufacturing industry players do not place environmental issues as the main focus in the supply of products. This study aims to analyze the characteristics of LDPE plastic waste that is formed into filaments for 3D printing filament applications. The research variables analyzed were the temperature of the test sample at 170 °C, 180 °C, 190 °C, 200 ºC, 210 °C, and 220 °C. The filament analysis process is to form LDPE plastic waste into 3D printing filaments using a plastic waste extrusion machine. The hardness test was then carried out using a digital Shore A Durometer Hardness tool. Furthermore, a microstructure test was also carried out using SEM (Scanning Electron Microscope). The results of the hardness test obtained show that the specimen temperature of 210 °C has the highest hardness value, which is in the range of 83–89.5 HA. In the meantime, specimens at 180 °C had the lowest hardness values, ranging from 59.5 to 71.5 HA. In addition, the SEM test resulted in the sample surface not being very flat at temperatures of 170 °C, 180 °C, and 190 °C, while the sample surface was quite flat at temperatures of 200 °C, 210 °C, and 220 °C.
A Field study on oscillating pontoon wave energy converter (WEC) performance in nearby Muarabaru, North Jakarta. abdul - hamid
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

Abstract Two-thirds of Indonesia's territory is sea waters with different wave heights according to local geographical conditions. And only with the mastery of technology, wave energy can be converted into electrical energy which is priceless. This paper aims to determine the performance of a wave energy converter (WEC) device based on a damped forced vibration system. The WEC set consists of a marine structure measuring 3.00 meters high, 2.00 meters wide, and 2.00 meters long; a two-dimensional heaving-pitching gearbox as a power take-off (PTO) and a pontoon type “H” beam measuring 2.96 meters long, 0.92 meters wide. The research was conducted by field testing on a 50-meter coastline measured from the low tide shoreline of nearby Muarabaru, North Jakarta, for 24 hours from high tide to the next which is done every 6 hours. The research results show that: The output power generated by the heaving motion is = 36.25 Watts, The efficiency value due to heaving = 25.87% The output power generated by the pitching motion is = 37.9 Watt, The efficiency value due to pitching = 27.30% Keywords: damped forced vibration system; performance of WEC; pontoon type "H" beam; power take-off (PTO); two-dimensional heaving-pitching gearbox
SMART SENSING FLUID FLOW DEVICE FOR MID STREAM PROCESS IN OIL AND GAS INDUSTRY Khushal Khan Kakar
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

In petroleum industries the storage tanks have a real problem of handling and management of fuel quantity. Various devices are used to monitor fuel quantity in storage tanks or boozers, such as flow sensors, level sensors, float switches, analog meters, most commonly probes and manuals. In this regard, we propose digital system to find out the amount of fuel in liters or milliliters in the storage tank.Main objective of this project is to develop a digital display which portrays the precise quantity of fuel being poured into a storage tank or fuel container. This display will help to verify the amount of fuel filled at petrol stations. Currently, the manual process of recording fuel readings is time-consuming and tedious. By implementing this proposed system, customers will save time by receiving an exact reading without the need for double-checking the tank or container. Lately, there have been frequent reports of fuel station fraud, where stations have pumps that display an inflated amount of fuel filled, while the actual quantity poured into the customer's vehicle is much less. In Pakistan, most cars are equipped with analog fuel meters, which do not provide an accurate measure of the fuel level or allow customers to verify the amount of fuel filled at a station.
Performance of Porous Asphalt Mixtures Using De-oiled Bleaching Earth (DBE) Filler With University Of New Hampshire Stormwater Center (UNHSC) Gradation Yafi Argyan Setiyanda Farrel; Boedi Rahardjo; Pranoto Pranoto
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

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

Abstract

Porous asphalt is an asphalt mixture designed with open-graded composite material and serves to drain water on the road surface into the pore of the mixture. The coarse aggregate composition that dominates the porous asphalt mixture makes it have low stability, in this research, DBE was used as a filler replacement to improve the performance of the mixture. This study aims to determine the performance of porous asphalt mixture using DBE filler with UNHSC gradation. Variations of DBE filler content used were 0%, 25%, 50%, 75%, and 100% by weight of filler. Test specimens with DBE filler were made using optimum asphalt content (KAO), with tests including Marshall test, binder drain down, permeability, and cantabro loss. The results showed that the performance of porous asphalt mixtures with DBE fillers obtained stability and VIM values decreased and flow values increased. In the permeability test, the highest value was 0.214 cm/s at 0% DBE, the highest cantabro loss value was 28.07% at 100% DBE, and the highest binder drain-down value was 0.24% at 0% DBE. The results of the research can conclude that the use of DBE as a filler can reduce the performance of porous asphalt mixtures.
Analysis and Optimization of Warehouse Sustainability Using the Sustainable Value Stream Mapping (SUS-VSM) Method at PT XYZ Friska Aryanti
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.
Numerical Analysis of the Influence of Bamboo Chips Variations on Road Embankment Stability and Settlement Arasi Arahman; Dian Purnamawati Solin; Karina Meilawati Eka Putri
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

Soft soil is characterized by low bearing capacity, high compressibility, and substantial settlement, thereby frequently causing complications in road embankment construction. One viable method for soil improvement is stabilization utilizing eco-friendly materials, such as bamboo chips. However, research concerning the effects of varying bamboo chip mixtures on the stability and settlement of embankments constructed on soft soil remains limited. This study aims to analyze the impact of bamboo chip mixture variations on consolidation characteristics, embankment stability, and soft soil settlement, utilizing the finite element method via PLAXIS 2D software. The investigation was conducted through one-dimensional consolidation testing (oedometer tests) on native soil and bamboo chip mixture variations of 25%, 30%, and 35%. The experimental results served as input parameters for the PLAXIS 2D numerical modeling to evaluate the safety factor and embankment settlement. The findings indicate that the incorporation of bamboo chips effectively enhances embankment stability and mitigates soil settlement compared to untreated soil conditions. The TA + BC (Native Soil + Bamboo Chips) 30% variation yielded the most optimal outcomes, exhibiting the lowest compression index and consolidation settlement, alongside a higher safety factor relative to the other variations. Overall, bamboo chips demonstrate significant potential as an economical and environmentally sustainable alternative stabilization material for road embankment construction over soft soils.

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