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G-Tech : Jurnal Teknologi Terapan
Published by Universitas Islam Raden Rahmat Malang
ISSN : 25808737     EISSN : 2623064X     DOI : -
Core Subject : Science, Engineering,
Computer Science & IT Decision Sciences, Operations Research & Management Energy Engineering
Jurnal G-Tech bertujuan untuk mempublikasikan hasil penelitian asli dan review hasil penelitian tentang teknologi dan terapan pada ruang lingkup keteknikan meliputi teknik mesin, teknik elektro, teknik informatika, sistem informasi, agroteknologi, dll.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 897 Documents
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Study on the Capacity of Auxiliary Weir-Type Spillway at Bulango Ulu Dam Gorontalo Province Using Spillway Routing Miskar Maini; Furqan Ali Yusuf
G-Tech: Jurnal Teknologi Terapan Vol 9 No 1 (2025): G-Tech, Vol. 9 No. 1 January 2025
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/gtech.v9i1.5805

Abstract

The spillway on the dam functions as a safeguard against the dangers of flood water, which overflows gradually to prevent overtopping. The estimated design of flood discharge uses the SCS SUH method, while outflow discharge is calculated through spillway routing based on reservoir storage characteristics. The study results show that the maximum flood discharge with a return period of 2 years up to the Probable Maximum Flood (PMF) scenario is 420.26 m³/s to 2,288.05 m³/s respectively. Spillway routing is carried out to drain flood water from the reservoir, with a maximum outflow discharge of 44.4 m³/s to 1,250.5 m³/s, according to the flood return period. This reservoir is able to reduce flooding significantly, with a flood reduction of 89.4% at a return period of 2 years and 45.3% for PMF. The water level at the spillway was measured at various return periods, indicating there was no overtopping until the PMF flood event. Bulango Ulu Dam, which is designed with a top Dam elevation of +105 m, can safely withstand PMF flood discharge.
Hydroxylation Reaction on Bio-lubricant Characteristics : A Case Study on Palm Kernel Oil Fatmayati Fatmayati; Razita Hariani; Nur Asma Deli
G-Tech: Jurnal Teknologi Terapan Vol 9 No 1 (2025): G-Tech, Vol. 9 No. 1 January 2025
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/gtech.v9i1.5835

Abstract

Historically, lubricants have relied on petroleum derivatives, but depleting resources necessitate alternatives. Vegetable oils are unstable for use due to oxidation but can be improved via chemical modification. This study examines bio-lubricant production from palm kernel oil, focusing on hydroxylation reaction time and compliance with SNI 06.7069:2012 standards. The production of bio lubricants in this study comprised three distinct stages: hydrolysis, epoxidation, and hydroxylation. Hydrolysis involves the processing of palm kernel oil to yield fatty acids and glycerol. Subsequently, the fatty acids produced during the hydrolysis reaction were epoxidized to yield the epoxy compounds. Subsequently, the epoxy compound is subjected to hydroxylation, resulting in the formation of a polyol compound that serves as the fundamental building block for the bio lubricants. Optimal bio lubricants outcomes were achieved with a hydroxylation reaction time of 240 min, resulting in a bio lubricants yield of 92.67, a kinematic viscosity value of 48.54 Cst at 313.15°K/40°C, a kinematic viscosity value of 10.89 Cst at 373.15°K/100°C, a viscosity index of 224, and a corrosion rate of 0.1496 mpy. The quality of the bio lubricants produced in this study was in accordance with the SNI 06.7069:2012 standard.
Storage Optimization at PT XY Using Class Based Storage and FSN Analysis Methods Septian Aditya; Said Salim Dahda
G-Tech: Jurnal Teknologi Terapan Vol 9 No 1 (2025): G-Tech, Vol. 9 No. 1 January 2025
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/gtech.v9i1.5845

Abstract

This research aims to make the process of picking goods according to their type easier, so that the distance of transporting materials is shorter than the previous distance. FSN Analysis classifies goods based on the frequency of demand, and Class Based Storage groups goods based on their category (FSN) and places them in strategic locations in the warehouse. In this research, changes to the warehouse layout were made manually based on the results of the FSN analysis and the application of the Class Based Storage method. The results of the FSN Analysis are 7 types of Fast moving category goods, 6 types of Slow moving category goods, and 2 types of Non-moving category goods. FSN analysis is made by sorting all frequencies of goods from the highest value, as well as cumulative calculations and frequency percentages. By comparing the initial layout with the proposed layout, data processing results in a total decrease from IDR 6.558.992,00/ month to IDR 3.825.480,00/ month, or 41,7% more efficient by using the proposed layout based on the Class Based Storage method and FSN Analysis reduce moment material handling 42%. Therefore, it can be concluded that the problem of storing goods in PT XY's warehouse will be solved if using a storage optimization policy that uses the Class Based Storage method and FSN Analysis as a review and reference material in arranging future storage layouts.
Integration of Multimedia Development Life Cycle (MDLC) and User-Centered Design (UCD) Methods in the Development of Vegetable Variety Recognition Puzzle Game for Children Renna Yanwastika Ariyana; Prita Haryani; Fx. Guntur Putra Susanto; Nizar Izzuddin Yatim Fadlan
G-Tech: Jurnal Teknologi Terapan Vol 9 No 1 (2025): G-Tech, Vol. 9 No. 1 January 2025
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/gtech.v9i1.5848

Abstract

Introducing the content and benefits of Vegetables to children is one way to increase understanding of the importance of a balanced diet and its relationship with health. Vegetables are a source of nutrients for the body, especially for optimal growth and development of children. Introducing various types of Vegetables through visualized media by utilizing a touch of technology is one of the best ways to introduce the benefitss of Vegetables to children. In the research conducted, the Multimedia Devlopment Life Cycle (MDLC) method and the User Centred Design (UCD) method will be integrated in the development of a puzzle game to introduce various Vegetables to children. The final result of the research conducted is a puzzle game application used to introduce a variety of Vegetables to children, by integrating the MDLC method for the development stages and UCD for UI / UX development tailored to user needs.
Prediction Analysis of Jakarta Composite Index Movement Using Support Vector Regression Method Marcelena Vicky Galena; Sediono Sediono; M. Fariz Fadillah Mardianto; Elly Pusporani
G-Tech: Jurnal Teknologi Terapan Vol 9 No 1 (2025): G-Tech, Vol. 9 No. 1 January 2025
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/gtech.v9i1.5879

Abstract

The JCI is an important indicator that reflects the performance of the Indonesian stock market. In recent times, the JCI has faced significant fluctuations due to complex factors, including global economic conditions and market sentiment, which make predicting its movements challenging. Good prediction is needed to support market stability and sustainable economic development as per SDGs point 8. This study applies a modern nonparametric regression method, namely Support Vector Regression (SVR), to predict a dataset in the form of weekly JCI data from the period April 2022 to October 2024 obtained from the investing.com website. The analysis shows that the SVR model with RBF kernel function provides the best performance, with MAPE of 1.43%, RMSE of 121.6196, and MAE of 104.65. The findings also reveal that the fluctuation pattern of the JCI cannot be fully explained based solely on historical data. External variables, such as global economic conditions and market sentiment, have a significant influence on the prediction results. Therefore, the SVR method can be utilized to optimize portfolio allocation based on weekly JCI predictions. In addition, the results of this study provide guidance for policymakers in designing proactive economic policies to mitigate market volatility and increase investor confidence.
Energy Audit of the Footwear Factory Administration Building Using the Energy Consumption Intensity Analysis (IKE) Method Awwalunisa Aliya Kusuma; Heri Sutanto; Muchammad Muchammad
G-Tech: Jurnal Teknologi Terapan Vol 9 No 1 (2025): G-Tech, Vol. 9 No. 1 January 2025
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/gtech.v9i1.5880

Abstract

This study aims to enhance energy efficiency in the administrative buildings of PT. XXX's footwear factory through an energy audit. Improving energy efficiency in cooling and refrigeration systems can significantly reduce energy-related emissions due to high electricity consumption. The research method involves an energy audit in accordance with ISO 50001:2018 standards, which includes collecting historical electricity consumption data, calculating and analyze of the energy consumption intensity (IKE) and analyzing energy-saving opportunities. The analysis results indicate that the Neki A Office Marketing Building and the Bottom Office Building with an average IKE value of 17.08. The criteria building is a bit wasteful.  Regarding to the analysis the significant use of electricity in every building is Air conditioning. So, the opportunity to reduce electricity and saving energy has three potentials. However, the significant impact and appropriate to implement common issue is retrofit air conditioning to inverter type. This study concludes that the implementation of energy efficiency measures can result in significant savings in electricity consumption.
ANALISIS PERATURAN STRATEGI PENGGUNAAN ENERGI TERBARUKAN DI INDONESIA: SEBUAH TINJAUAN Ester Nugraheny Natalia Purba; Chairul G. Irianto
G-Tech: Jurnal Teknologi Terapan Vol 9 No 1 (2025): G-Tech, Vol. 9 No. 1 January 2025
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/gtech.v9i1.5910

Abstract

This article discusses developments in the use of renewable energy in Indonesia, identifies the obstacles faced, and offers innovative solutions for managing renewable energy in this country. The aim of the research is to increase awareness of researchers, policy makers and investors about Indonesia's great potential in the field of renewable energy, as well as increasing capabilities in its use. This research seeks to provide new insights to policy makers for future decision making, in achieving the target of renewable energy use of up to 31% by 2050 in accordance with the General National Energy Plan (RUEN). This research uses a qualitative descriptive method to analyze conditions for the use of renewable energy, readiness, obstacles, and solutions that support the achievement of RUEN goals. By referring to the latest scientific literature, government poli-cies, and regulations, this article seeks to explain the relationship between renewable energy sources, energy policies, and relevant strategies to advance the use of renewable energy in Indonesia. The findings indicate that the government faces a significant challenge in aligning the energy mix target by 2050 with the current realization. Insufficient regulations and lack of research and development of renewable energy technology may also contribute to this challenge.
Evaluation of the West Papua Central Statistics Agency Website Quality Using the WebQUAL 4.0 Method Edi Meidika; Marlinda Sanglise; Alex De Kweldju
G-Tech: Jurnal Teknologi Terapan Vol 9 No 1 (2025): G-Tech, Vol. 9 No. 1 January 2025
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/gtech.v9i1.5941

Abstract

As the official statistical data provider in Indonesia, BPS always innovates to provide better services to the community. By utilizing information technology, BPS has presented various online services such as websites. This research aims to evaluate the quality of the West Papua BPS website using the webqual 4.0 method. The WebQUAL process involves measuring user perceptions of a website's quality based on three primary dimensions: Usability, Information Quality, and Service Quality. The flow of this research includes planning, data collection and data analysis. This study used 139 respondents. Based on the results of the analysis that has been done, the results of the hypothesis can be concluded that the three dimensions of Usabilitiy, Information Quality and Service Quality are in the category (Accepted) where users feel fast with the quality of the West Papua BPS website.
Evaluation of Flexible Pavement Using the 2017 Bina Marga Method Study on Darul Hikmah Street, Terong Tawah, Labuapi District Adiman Fariyadin; Anwar Efendy; Salwa Silviana
G-Tech: Jurnal Teknologi Terapan Vol 9 No 1 (2025): G-Tech, Vol. 9 No. 1 January 2025
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/gtech.v9i1.5993

Abstract

Flexible pavement utilises asphalt as a binding agent. The pavement layer transmits and distributes the weight from the road or flexible pavement uniformly onto the compacted subgrade. Damage to flexible pavement results from a confluence of multiple connected factors. The purpose of the study is to ascertain the thickness of flexible pavement layers and the various forms of flexible pavement. This research employs the 2017 Bina Marga approach, utilising predicted LHR data over the design life or LHRT, to ascertain the kind and thickness of flexible pavement layers, considering the CESA4 and CESA5 values. The 2044 LHRT value for Passenger Cars and Other Light Vehicles is 33,358.7; Class 5A is 6.2; Class 5B is 4.1; Class 6A is 17.1; Class 6B is 39.1; and Class 8 or non-motorized vehicles is 280.1. The CESA4 value derived from the LHRT value was 4021566.47, whereas the CESA5 value was 469755.421. The most preferred type and thickness of flexible pavement is asphalt with a granular foundation layer, namely AC – WC pavement type at 4 cm thickness, AC – BC at 6 cm thickness, and LFA Class A at 40 cm thickness.
Design of Outseal PLC-Based Temperature and Humidity Regulator for Oyster Mushroom Cultivation Rooms Using Node-RED Jujung Caesar Ningearso Putra; Rini Puji Astutik
G-Tech: Jurnal Teknologi Terapan Vol 9 No 1 (2025): G-Tech, Vol. 9 No. 1 January 2025
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/gtech.v9i1.5995

Abstract

Oyster mushroom is one type of exotic plant that has high economic value and great potential to be developed commercially. The current economic condition of mushroom cultivation is not supported by the availability of adequate investment capital and limited human resources in the oyster mushroom sector. In addition, oyster mushroom cultivation requires special skills and supporting technology. Increasingly developing technology provides more choices in technology development, especially in the field of oyster mushroom cultivation. PLC Outseal is one alternative in the development of oyster mushroom cultivation technology. PLC Outseal was chosen because it is cheap and has been proven reliable in the industrial world. Controlling room temperature 22 - 28 ℃ and humidity 60 - 80% in oyster mushroom cultivation is very important for the success of oyster mushroom cultivation. In this study, the use of the LM35 sensor with ladder plc outseal programming has an error of 1.3% when compared to the HTC-1 digital thermometer and the humidity sensor has an error of 0.69% when compared to the SM150T. The use of RS 485 in communication up to 110 m between slaves has no obstacles and is very stable in testing between slave plc outseal. Node RED as an IoT (Internet of Things) platform is very good for monitoring the temperature and humidity of the growing media in mushroom cultivation.

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