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Jurnal Info Sains : Informatika dan Sains
Published by SEAN INSTITUTE
ISSN : 20893329     EISSN : 27977889     DOI : -
Core Subject : Science,
Computer Science & IT
urnal Info Sains : Informatika dan Sains (JIS) discusses science in the field of Informatics and Science, as a forum for expressing results both conceptually and technically related to informatics science. The main topics developed include: Cryptography Steganography Artificial Intelligence Artificial Neural Networks Decision Support System Fuzzy Logic Data Mining Data Science
Arjuna Subject : Ilmu Komputer (semua kategori) - Ilmu Komputer (Lain-Lain)
Articles 458 Documents
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Analysis of KBL 02 Feeder Protection Coordination to Improve Reliability at PT PLN (Persero) Djty ULP Purwokerto City Nia Rohchani; Hamdani , Hamdani; Reza Juliangga
Jurnal Info Sains : Informatika dan Sains Vol. 16 No. 02 (2026): Info sains, 2026
Publisher : SEAN Institute

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Abstract

In 2017, the KBL02 feeder was recorded as having a low reliability level due to the high frequency of PMT and recloser tripping faults. Based on the fault data evaluation, most fault locations were downstream of the recloser, but the protection system actually caused the outgoing PMT to operate first. This condition resulted in a wider outage area and reduced electricity supply to customers, resulting in an increase in the SAIDI and SAIFI reliability index values ​​at PT PLN (Persero) Purwokerto City ULP. The main problem was caused by inconsistencies in protection coordination between the outgoing PMT and the KBL02.067 recloser, which was influenced by recloser placement that was not aligned with the OCR and GFR settings. This study aims to evaluate protection coordination and determine recloser relocation based on fault current calculations and protection settings. The results are expected to improve protection system selectivity and enhance power distribution reliability at the KBL02 feeder.
Effectiveness of Goat Manure and Liquid Organic Fertilizer from Coffee Skin Waste on Growth of Cat's Whisher Cuttings (Orthosiphon Aristatus) Restu Bremana Tarigan; Najla Lubis; Desi Sri Pasca Sari Sembiring
Jurnal Info Sains : Informatika dan Sains Vol. 16 No. 02 (2026): Info sains, 2026
Publisher : SEAN Institute

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This study aims to determine the effectiveness of goatmanure and liquid organic fertilizer made from coffee husk waste on the growth of Java tea (Orthosiphon aristatus) cuttings. The study used a factorial Randomized Block Design (RBD) consisting of two factors with 48 plots. The first factor was the application of goat manure, symbolized as “S,” with four treatment levels: S0 (without goat manure), S1 (250 g/polybag), S2 (350 g/polybag), and S3 (450 g/polybag). The second factor was the application of liquid organic fertilizer made from coffee husk waste, symbolized as “K,” with four treatment levels: K0 (0 ml/L water/polybag), K1 (30 ml/L water/polybag), K2 (60 ml/L water/polybag), and K3 (90 ml/L water/polybag). Thus, there were 16 treatment combinations with three replications. The parameters observed in this study were the time of shoot emergence, number of shoots, shoot length, number of leaves, plant height, and survival percentage. The results showed that the application of goat manure and liquid organic fertilizer from coffee husk waste on the growth of Java tea (Orthosiphon aristatus) cuttings had no significant effect on all observed parameters.
The Influence of Buffet Food Quality and Experiential Marketing on Repurchase Intention Through Customer Satisfaction Alamsyah, Ahmad; Efendi, Efendi; Al Agus Kristiadi
Jurnal Info Sains : Informatika dan Sains Vol. 16 No. 02 (2026): Info sains, 2026
Publisher : SEAN Institute

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Abstract

The study aims to analyze the effect of buffet food quality and experiential marketing on repurchase intention through customer satisfaction, Case Study of Cafe Gran Via Jakarta. The study uses quantitative research with a survey approach to obtain customer responses to the Case Study of Cafe Gran Via Jakarta. The sampling technique uses purposive sampling with the aim of obtaining customers who have enjoyed food at Cafe Gran Via Jakarta more than once. The distribution period of the research instrument from November 15, 2023 to December 31, 2023 obtained 250 respondents. The data analysis technique uses PLS-SEM. Results of the study: Buffet food quality and experiential marketing have a positive and significant effect on customer satisfaction and has a influence on repurchase intention. While customer satisfaction can be a mediator variable. Recommendation: to vary the buffet food menu periodically by adding new, attractive and innovative dishes so as to increase repurchase intention and create a friendly and pleasant environment for customers to strengthen relationships with existing customers and attract new customers to return to buy food at Cafe Gran Via Jakarta.
Analysis of Energy Consumption and Electrical Power Efficiency on Conventional and CNC Lathes at CV Wakinara Teknik Rifky Maulana; Rahmaniar, Rahmaniar; Parlin Siagian
Jurnal Info Sains : Informatika dan Sains Vol. 16 No. 02 (2026): Info sains, 2026
Publisher : SEAN Institute

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Abstract

This research is motivated by the high consumption of electrical energy in the machining process that has not been balanced with an analysis of power usage efficiency, especially on conventional lathes and CNC machines at CV Wakinara Teknik. The lack of monitoring and evaluation of energy consumption leads to potential electricity waste and suboptimal machine utilization in production activities. Therefore, this study aims to analyze the energy consumption and level of electrical power efficiency on both types of machines to determine the comparison of energy performance and potential savings opportunities. The research method used includes direct measurement of electrical parameters such as voltage, current, power, and power factor during the machine operation process. The data obtained are then analyzed to calculate energy consumption and power usage efficiency on each machine. In addition, a comparison of energy consumption characteristics between conventional and CNC lathes is conducted under similar workload conditions. The results show that CNC machines tend to have more stable energy consumption and higher power efficiency than conventional lathes, although under certain conditions their power consumption is greater due to the use of an automatic control system. Meanwhile, conventional lathes have higher fluctuations in energy consumption and relatively lower efficiency. These findings indicate that the application of CNC machines can improve energy efficiency in production processes, as well as provide a basis for developing more optimal energy management strategies in industrial environments.
Efforts to Reduce Non-Technical Losses by Maintaining Kwh Meters at PT. PLN (PERSERO) ULP Panarukan Diana Pratiwi; Zuraidah Tharo; Dino Erivianto
Jurnal Info Sains : Informatika dan Sains Vol. 16 No. 02 (2026): Info sains, 2026
Publisher : SEAN Institute

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Abstract

This study aims to analyze the effectiveness of kWh meter maintenance as an effort to reduce non-technical losses in the electricity distribution system at PT. PLN (Persero) ULP Panarukan. Non-technical losses, which are often caused by meter inaccuracy, recording errors, and illegal usage, have a direct impact on the company's revenue. Using a quantitative descriptive approach, this study compares the level of non-technical losses before and after the implementation of a structured kWh meter maintenance and replacement program. Data were collected through field observations, interviews, and documentation from PLN's internal systems (ACMT, AP2T, EIS). The results show that maintenance activities successfully improved measurement accuracy, which led to a decrease in unrecorded energy. Thus, non-technical losses were reduced and resulted in significant financial savings. In addition, the study proposes an age-based meter replacement Operational Target (TO) as a strategic framework for determining maintenance action priorities. It is concluded that optimizing the maintenance program for aging kWh meters is a crucial operational step in controlling non-technical losses and securing PT. PLN's revenue.
Design, Simulation, and Performance of Afsrg 8/8 in an Electric Power Generation System with Low Speed Drive Rafles Prasuki Pasaribu; Parlin Siagian; Rahmaniar, Rahmaniar
Jurnal Info Sains : Informatika dan Sains Vol. 16 No. 02 (2026): Info sains, 2026
Publisher : SEAN Institute

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Abstract

Low-speed micro-hydro power plants require generators with high starting torque, good efficiency, and the ability to operate at low rotational speeds. This study designs and builds an Axial Flux Switched Reluctance Generator (AFSRG) with an 8/8 configuration to address those needs. AFSRG was chosen for its simple structure, robustness, and magnet-free operation. The methodology included geometric design using CAD software, electromagnetic simulation using FEMM, and experimental testing in a micro-hydro setup. The results show that the 8/8 AFSRG can generate 48V at 300 rpm with a system efficiency of 78%. AFSRG is feasible for use in remote micro-hydro power generation applications with low-speed water flow.
Automatic Power Transfer Control System Using Esp 32 Based on Wokwi Simulation Alamsyah Harahap; Hamdani, Hamdani; Ahmad Dani
Jurnal Info Sains : Informatika dan Sains Vol. 16 No. 02 (2026): Info sains, 2026
Publisher : SEAN Institute

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Abstract

The reliability of electrical power systems is crucial for supporting the continuity of critical sector operations. This study aims to design, implement, and evaluate an Automatic Transfer Switch (ATS) system using ESP32 microcontroller through Wokwi simulation platform. The research employs Research and Development (R&D) methodology with ADDIE approach, encompassing analysis, design, development, implementation, and evaluation phases. The system is equipped with intelligent control algorithms including moving average filter with 10-sample window size and multi-criteria fault detection requiring 5 consecutive samples for verification. Testing was conducted through four main scenarios: fault detection, transfer time measurement, return transfer, and system stability evaluation. Results demonstrate that the system achieves excellent performance with average transfer time of 2,391 seconds, significantly faster than IEEE 446-2017 standard (10 seconds). Voltage detection accuracy reaches 98.9% with MAPE of 1.08%, while system stability shows false switching rate of only 1.25%. The switching mechanism is dominated by relay mechanical delay (91.5% of total transfer time), with detection time contributing only 6.5% and processing time 2.0%. Compared to previous studies, ESP32-based ATS offers competitive performance with optimal balance between speed, accuracy, and cost-effectiveness. This research validates the effectiveness of simulation-driven development methodology using Wokwi platform, reducing development time by 65% ​​and prototyping costs by 70%. The findings provide a significant contribution to developing accessible and efficient ATS solutions for small and medium-scale applications, while demonstrating Wokwi's capability as a reliable embedded systems development tool.
The Relationship Between Forgiveness and Subjective Well-Being Among Adolescents Living in Orphanages Salsabila Febrina Putri; Santi Esterlita Purnamasari
Jurnal Info Sains : Informatika dan Sains Vol. 16 No. 02 (2026): Info sains, 2026
Publisher : SEAN Institute

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Abstract

This study aims to examine the relationship between forgiveness and subjective well-being among adolescents residing in orphanages. It posits the hypothesis of a positive relationship between forgiveness and subjective well-being in this population. The participants comprised 110 adolescents aged 13–18 years. Data were collected using the Satisfaction with Life Scale (SWLS), Scale of Positive and Negative Experience (SPANE), and Transgression-Related Interpersonal Motivations Inventory-18 (TRIM-18). Product-moment correlation was employed for data analysis. Results revealed a correlation coefficient (rxy) of 0.827 with p = 0.000 (p < 0.001), supporting the hypothesis of a positive correlation. The coefficient of determination (R2) was 0.683, indicating that forgiveness accounts for 68.3% of the variance in subjective well-being, with the remaining 31.7% attributable to other factors.

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