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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 168 Documents
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Mitigation Schemes for Banggae Future Tsunami, West Sulawesi Province, Indonesia Achmad Yasir Baeda; Nurhidayani Namiruddin
EPI International Journal of Engineering Vol 2 No 2 (2019): Volume 2 Number 2, August 2019 with Special Issue on Natural Disaster and Mitigat
Publisher : Center of Techonolgy (COT), Engineering Faculty, Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25042/epi-ije.082019.02

Abstract

Geologically, Sulawesi Island is a complex area. It is caused by the convergence between three lithosphere plates, where the Australian Plate drifting to North, Pacific to West, and Eurasia from South to South-East respective. The future tsunami simulation was done by using SiTProS (Siam Tsunami Propagation Simulator) Version 1.5., which uses data such as earthquakes coordinate, magnitudes, focus depths, and propagation scheme, as the main input parameters in the simulations. Based on those future tsunami simulations results, the mitigation scheme chosen for Banggae District of Majene Region, West Sulawesi Province is the Vertical Tsunami Mitigation scheme. Due to its detailed parameters i.e. population details, evacuation time, distance and speed, the Vertical Tsunami Mitigation Scheme can determine the existence of shelters parameters and analyze the additional shelters needed in precise manner.
Polya Counting Theory Applied to Combination of Edge Conditions for Generally Shaped Isotropic Plates Yoshihiro Narita
EPI International Journal of Engineering Vol 2 No 2 (2019): Volume 2 Number 2, August 2019 with Special Issue on Natural Disaster and Mitigat
Publisher : Center of Techonolgy (COT), Engineering Faculty, Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25042/epi-ije.082019.16

Abstract

Structural behaviors of plate components, such as internal stress, deflection, buckling and dynamic response, are important in the structural design of aerospace, mechanical, civil and other industries. These behaviors are known to be affected not only by plate shapes and material properties but also by edge conditions. Any one of the three classical edge conditions in bending, namely free, simply supported and clamped edges, may be used to model the constraint along an edge of plates. Along the entre boundary with plural edges, there exist a wide variety of combinations in the entire plate boundary, each giving different values of structural responses. For counting the total number of possible combinations, the present paper considers Polya counting theory in combinatorial mathematics. For various plate shapes, formulas are derived for counting exact numbers in combination. In some examples, such combinations are confirmed in the figures by a trial and error approach.
Valuation of Environmental Impact Due to Material Construction Mining, Gowa, South Sulawesi Andi Arjan; Arikah Nurhusna Afifah; Yubelium Andrew Patila; Aryanti Virtanti Anas
EPI International Journal of Engineering Vol 3 No 1 (2020): Volume 3 Number 1, February 2020
Publisher : Center of Techonolgy (COT), Engineering Faculty, Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25042/epi-ije.022020.13

Abstract

Sand, river stone, soil excavation, sandstone and broken stone are the types of construction materials mining in Gowa Regency and many are found in the Jeneberang River. The Jeneberang River is one of the main rivers in South Sulawesi. However, construction materials mining carried out around the Jeneberang River has a negative impact on the surrounding environment. Those negative impacts are erosion, road damage, noise, air pollution, and decrease in water quality. This research was conducted in Gowa Regency. The method used is the Contingent valuation method (CVM). CVM consists of the desire to pay (Willingness to Pay or WTP) and the desire to accept (Willingnes to Accept or WTA. While the social aspect conducts interviews with questionnaire questions to respondents to find out opinions about the surrounding environment. From this study, it is known that WTP and WTA data are inversely proportional. The greater the compensation to be paid, the more societies who want to receive and the fewer companies paid for the compensation.
Prediction of an Optimum Total Resistance Coefficient on Catamaran using Design of Experiment (DOE) Incorporated with CFD Approach Ahmad Fitriadhy; Sun Yin Lim; Adi Maimun
EPI International Journal of Engineering Vol 3 No 1 (2020): Volume 3 Number 1, February 2020
Publisher : Center of Techonolgy (COT), Engineering Faculty, Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25042/epi-ije.022020.11

Abstract

In presence of complex hydrodynamic interferences between two demihulls on a catamaran ship has been prone to have a reliable prediction to her optimum total resistance. To achieve this, the author presents a Computational Fluid Dynamic (CFD) modelling incorporated with Design of Experiment (DOE) approach. Several parameters such as effect of Froude number ( ) with respect to various lateral separation ratios (S/L) of the catamaran have been taken into account. Here, the optimum total resistance coefficient (CT) has been mainly set within the range of S/L ratio 0.2 ≤ S/L ≤ 0.4 associated with Froude number 0.56 ≤ ≤ 0.66. The primary objective function of this optimization model has led towards minimizing a drag force and increased a lift force with respect to the above S/L ratios. In general, the simulation results had seemed quantitative similarity values for the optimum of 0.6589, 0.6599 and 0.6596 with S/L ratios of 0.2, 0.3 and 0.4, respectively. In the case of = 0.56, the optimum S/L ratios of 0.2993 and 0.3988 have resulted in insignificant reduction of CT by 0.62% and 0.32% as compared to S/L of 0.3 and 0.4, respectively. Similarly, the optimum S/L ratios of 0.2750 and 0.3750 with = 0.66 have led to reduce by 0.14% and 0.46% as compared to S/L of 0.3 and 0.4, respectively. This CFD simulation results are very useful as preliminary data for the optimised ship resistance, which is mainly required to predict a ship powering in the early design stage.
Design of Water Quality Monitoring System for Crab Larvae using IOT Wahyudi Sofyan; Muhammad Niswar; Andani Achmad
EPI International Journal of Engineering Vol 3 No 1 (2020): Volume 3 Number 1, February 2020
Publisher : Center of Techonolgy (COT), Engineering Faculty, Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25042/epi-ije.022020.07

Abstract

Abstract Water quality is one of the determining factors in maintaining survival and growth of crab larvae, therefore we need a tool that can monitor water quality which includes temperature parameters, pH and salinity in real time and online in crab larva culture. This system consists of several sensor nodes with the main component being Arduino Uno which is connected by several sensor nodes as a publisher and Raspberry Pi 3 (RPi3) board as a broker. Data from each sensor node will be sent to brokers with different topics - and stored to a database using a wireless network. The application system used with the MQTT (Message Queue Telemetry Transport) protocol uses a red node. Red node will display data of each sensor node in the form of gauge and graph. In this study a water quality monitoring system was designed and developed. This tool uses the MQTT (Message Queue Telemetry Transport) protocol to display sensor node data in real time.
Characteristics of Micro Spatial Patterns, Functions and Meanings of the Towani Tolotang’s Traditional House Husnirrahman Jamaluddin; Afifah Harisah; Ria Wikantari
EPI International Journal of Engineering Vol 3 No 1 (2020): Volume 3 Number 1, February 2020
Publisher : Center of Techonolgy (COT), Engineering Faculty, Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25042/epi-ije.022020.09

Abstract

The architecture of Towani Tolotang’s traditional house has characteristics that represents the identity, activities, social and cultural values ​​of the community. The Towani Tolotang people strongly maintain the relationship of togetherness and unity shown by the architecture of traditional houses. This study discussed and examined the characteristics of micro spatial patterns, functions, and meanings of the Towani Tolotang’s traditional house. The study was conducted in Amparita Village, Sidrap Regency, South Sulawesi. The discussion on the architecture of the traditional house of Towani Tolotang was carried out by applying the naturalistic phenomenological method. This type of research is qualitative with the process of collecting data through participatory observation, in-depth interviews, and document studies. Data analysis was performed using descriptive qualitative, describing in accordance with the natural situation. The results of the study revealed that there were two spaces in the spatial pattern of Towani Tolotang’s traditional house being the characteristics different from Bugis’s houses in general. They were tamping and special rooms. The function of the space was similar to the Bugis’s house in general, except the two spaces. Tamping was functioned as a place to receive guests with the status of ordinary people, and the special room was used as a place for ritual and taking prayer for the people of Towani Tolotang. Every space in the Towani Tolotang’s traditional house has its own meaning, included tamping which means respect for the traditional leader and special room which means the sacred space.
The Effectiveness of Petobo Temporary Shelter Asiana Rahmawati; Mohammad Mochsen; Abdul Mufti Radja
EPI International Journal of Engineering Vol 3 No 1 (2020): Volume 3 Number 1, February 2020
Publisher : Center of Techonolgy (COT), Engineering Faculty, Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25042/epi-ije.022020.08

Abstract

Temporary shelter (huntara) is one of the government's solutions in undertaking victims after a disaster. Shelter of Petobo is one of the temporary shelters built by the government in the aftermath of the disaster in Palu City in September 28th, 2018. Petobo shelter was built in October and occupied in December. This shelter has a capacity of 70 units. 1 unit of the shelter is measured 26.4m x 12m, it consists of 12 rooms, 4 bathrooms, 4 toilets, a laundry room, and a shared kitchen. The shelter consists of 840 room cubicles with room sizes of 3.6m x 4.8m. After being occupied, some residents said that the shelter they lived in was very small, with family members of more than 3 people, the space for occupants was very limited so that some residents made changes to their residential units. This study evaluates Petobo shelter with BNPB and UNHCR Standards, and examines occupant perceptions about the effectiveness of Petobo shelter in terms of physical building requirements which consist of safety, health, comfort, and convenience. This research was conducted in Palu City, Central Sulawesi. The type of this research is evaluation, using survey methods to measure the value of several variables. The data obtained were analyzed using descriptive statistical techniques. The results of this study indicate that the Petobo shelter is in accordance with BNPB and UNHCR standards, but according to the occupants' perception it is less effective in terms of the physical requirements of the building, which consists of safety, health, comfort, and convenience as a post-disaster refugee residence.
Study on Facility Development of Maccini Baji Port as a Minor and Hub Port for Small Island Connectivity Akbar Makmur; Misliah Idrus; Andi Siti Chairunnisa; Suandar Baso
EPI International Journal of Engineering Vol 3 No 1 (2020): Volume 3 Number 1, February 2020
Publisher : Center of Techonolgy (COT), Engineering Faculty, Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25042/epi-ije.022020.10

Abstract

Maccini Baji port as minor port is a hub of small islands connectivities in Pangkejene and Kepulauan Regency, South Sulawesi. It has strategic role to serve cargo and passenger ship from not only small islands in Pangkejene and Kepulauan Regency but also from outside such as Papua, Maluku, and Nusa Tenggara Timur. Correspondingly, Maccini Baji port has faced the fluctuated increase of visited ships from 2011 to 2018 based on forecasting result by using stepwise and regression methods and has a good potential to be developed especially for cement cargo. This study describes analysis on port facility performance of Maccini Baji and its development. The research result has shown the berth occupancy ratio (BOR) of Maccini Baji port in 2022 will reach 61%. This has become a primarily point to consider in lengthening berth of Maccini Baji port. Therefore, the port berth of Maccini Baji should be lengthened 272 meters where existing berth length is 225 meters. In addition, basin and anchorage area will be also developed where the dimensions of turning basin will be 6 meters in depth, 121.8 meters in diameters, and its area will be 116 m2. The dimensions of anchorage area will be 6 metres in depth, and 105.9 meters in radius and its area will be 35.21 m2. Based on SWOT analysis, some aspects will be considered to succesfully develop Maccini Baji port such as geographic location, port facility improvement, increas of service capacity and facility efficiency, development of hinterland area, local government participation.
Thermal and Flow Characteristics of Discrete Double Inclined Ribs at Low Curvature Coil for GSHP Application Teguh Hady Ariwibowo; Keishi Kariya; Akio Miyara
EPI International Journal of Engineering Vol 3 No 1 (2020): Volume 3 Number 1, February 2020
Publisher : Center of Techonolgy (COT), Engineering Faculty, Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25042/epi-ije.022020.02

Abstract

In this study, the thermal and hydraulic characteristics in low curvature coil with Discrete Double Inclined Ribs (DDIR) were investigated. Water is selected as a working fluid, and flowrate range from 1 to 5 L/min, which is a low flowrate condition. Effect of geometry parameters such as distance between ribs, curvature ribs, and ribs inclination angles was observed. Results obtained by numerical simulations show that the heat transfer in DDIR-coil is 7.7 to 29.11% greater than that in plain coil, while the pressure drop was approximately 12.7 to 89.5% larger than that of plain-coil. A COP improvement factor that is calculated based on energy loss by pressure drop and energy saving by heat transfer enhancement was found to vary between 0.25 and 5.29. Flow visualization shows that there are two vortexes in cross-section at the downstream, and local vortexes arise around the ribs of DDIR-coil, which shows similar pattern and strength to DDIR-straight tube. The vortex makes a long fluid particle path and strengthens the turbulent mixing between the wall and the core flow of the coil. Based on these findings, DDIR-coil is recommended for applications in Slinky Ground Heat Exchangers, especially at low flowrates.
OFDM-IDMA Uplink Multi-user System with Scalable Latency for Next Generation WLAN Leonardo Alisasis Lanante; Nguyen Tran Thi Thao; Yuhei Nagao; Hiroshi Ochi
EPI International Journal of Engineering Vol 3 No 1 (2020): Volume 3 Number 1, February 2020
Publisher : Center of Techonolgy (COT), Engineering Faculty, Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25042/epi-ije.022020.06

Abstract

In this paper, we propose an Interleave-Division Multiple Access (IDMA) based uplink multi-user system fornext generation WLAN. By minimizing the latency throughaccurate detection per iteration, we were able to design a receiver architecture that meets the latency demands of current IEEE802.11 WLAN. To do this, the proposed system utilizes a novel algorithm for simplified LLR calculation of the soft input soft output demapper needed in the IDMA first stage detection.The proposed system has a maximum of 34.8 bits/s/Hz spectral efficiency for a single spatial stream and can support up to 8 users in a single 20MHz channel. We compare the proposed system to a reference OFDMA system and show its advantages in terms of diversity, flexibility and BER performance. Keywords: 802.11ax; IDMA; uplink multi-user access

Page 7 of 17 | Total Record : 168

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