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Jurnal Nasional Teknologi Komputer
Published by CV. HAWARI
ISSN : 28087801     EISSN : 28084845     DOI : -
Core Subject : Science,
Computer Science & IT
Jurnal Nasional Teknologi Komputer di bidang ilmu komputer dan teknologi. Jurnal JNASTEK diterbitkan oleh CV. Hawari. Redaksi mengundang peneliti, praktisi, dan mahasiswa untuk menulis perkembangan ilmiah di bidang-bidang yang berkaitan dengan teknologi informasi, teknik informatika dan sistem komputer. Jurnal JNASTEK terbit 4 (Empat) kali dalam setahun pada bulan Januari, April, Juli dan Oktober. Jurnal ini berisi artikel penelitian dan kajian ilmiah.
Arjuna Subject : Ilmu Komputer (semua kategori) - Perangkat Lunak
Articles 83 Documents
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Search results for , issue "Vol 5 No 3 (2025): Juli 2025" : 83 Documents clear
Desain dan Pembangunan Aplikasi Augmented Reality untuk Pengenalan Huruf Alphabet secara Interaktif pada Siswa dan Siswi Raudhatul Athfal Al Hasan Kota Binjai Astria Dwi Yanti; Heni Wulandari; Ruly Dwi Arista
Jurnal Nasional Teknologi Komputer Vol 5 No 3 (2025): Juli 2025
Publisher : CV. Hawari

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61306/jnastek.v5i3.233

Abstract

Humans today are very dependent on technology. Technology is a basic need of every individual. Raudhatul Athfal Al-Hasan has not utilized technology optimally in the teaching and learning process. Researchers have a goal to design and build Augmented Reality (AR) applications for interactive introduction of alphabet letters. The method used is Marker Based Tracking. This application is designed so that children can understand the material and use it easily in classroom learning activities. The focus of the research lies on the design and development of Augmented Reality (AR) applications. The users gave a positive assessment. The average System Usability Scale (SUS) score reached 80.8. The value is equivalent to Grade B. The application quality assessment is in the Excellent category. The level of user acceptance is in the Acceptable category. The results show that the application provides significant benefits in the learning process.
Analisis Pengaruh Beban Peralatan Bengkel Terhadap Intensitas Konsumsi Energi (IKE) Di PT.Buana Jaya Lestari Taufik Refyandra; Rahmaniar; Parlin Hambali
Jurnal Nasional Teknologi Komputer Vol 5 No 3 (2025): Juli 2025
Publisher : CV. Hawari

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61306/jnastek.v5i3.234

Abstract

This study analyzes the Energy Consumption Intensity (ECI) at the multi-story motorcycle workshop of PT. Buana Jaya Lestari in Medan to identify energy consumption characteristics and optimization potential. The research method used energy audits, direct measurements, and historical energy consumption data analysis over a 12-month period. The research object is a multi-story workshop with a total area of 1,850 m² distributed across three floors with different functions. The results of the study show a total ECI of 100.67 kWh/m²/year, which meets the national standard for commercial buildings with partial air conditioning. Energy consumption distribution per floor varies significantly: floor 1 (138.09 kWh/m²/year), floor 2 (99.84 kWh/m²/year), and floor 3 (48.00 kWh/m²/year). The air conditioning system dominates energy consumption with a contribution of 42.1%, followed by the lighting system (23.9%), workshop equipment (20.0%), and support systems (14.0%). The most influential factors are external ambient temperature (correlation 0.85) and the number of vehicles served (correlation 0.78). Energy savings potential reaches 13.4% or 24,878 kWh/year through optimization of the air conditioning system and retrofitting of the lighting system. Implementing energy conservation strategies can result in financial savings of Rp 37,317,000/year, a reduction in CO₂ emissions of 17.41 tons CO₂eq/year, and a decrease in the Energy Performance Index (EPI) to 87.25 kWh/m²/year.
Implementasi Sistem IoT Monitoring Kualitas Udara Dalam Kelas Untuk Kenyamanan Pengguna Ruangan Kelvyn Rosan; Fachrid Wadly; Muhammad Amin
Jurnal Nasional Teknologi Komputer Vol 5 No 3 (2025): Juli 2025
Publisher : CV. Hawari

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61306/jnastek.v5i3.235

Abstract

This study aims to design and buiId an Internet of Things (IoT)based air quality monitoring system that can be applied in classrooms to support the comfort and health of room users. This system integrates the NodeMCU ESP8266 microcontroIIer with a DHT11 temperature and humidity sensor, and an MQ-135 air quality sensor. The environmental data obtained is displayed in real-time via the Blynk application and an OLED LCD screen, making it easy to monitor without having to be on site. The design process was carried out using the Research and Development (R&D) method approach, which includes the stages of identifying needs, designing, implementing, and testing the system in the fieId. The test results show that the system is able to provide accurate and stable data with temperature and humidity measurement deviations that are still within tolerance limits. This system is expected to be a simple but effective solution to maintain classroom air circulation, while increasing awareness of the importance of air quaIity in educational environments.
Evaluasi Sifat Mekanik Sambungan Saw Material BS 1501 223 490B Melalui Uji Destruktif Hendra Susilo; Putra Pratama; Suardi; Fadlah K. Sinurat
Jurnal Nasional Teknologi Komputer Vol 5 No 3 (2025): Juli 2025
Publisher : CV. Hawari

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61306/jnastek.v5i3.236

Abstract

his study aims to evaluate the mechanical properties of welded joints produced using the Submerged Arc Welding (SAW) method on BS 1501 223 490B steel material. The evaluation was carried out through destructive testing, including tensile test, bend test, and Charpy impact test. The tensile test revealed a maximum tensile strength of 584.39 N/mm² on the All Weld specimen, with an elongation of 26.23%. In the Transverse test, fracture occurred in the base metal, indicating that the weld joint had superior quality compared to the parent material. The bend test on both Face Bend and Root Bend specimens showed visually "Satisfactory" results, with maximum stress reaching 2,122.55 N/mm². The Charpy V-notch impact test indicated an average absorbed energy of 109.98 Joules at room temperature, demonstrating good toughness under impact loading. The results confirm that welded joints produced by the SAW method on BS 1501 223 490B steel exhibit excellent strength, ductility, and toughness, making them suitable for structural and high-pressure applications. This study reinforces the effectiveness of the SAW method in producing high-quality joints in the metal fabrication industry.
ANALISIS PERUBAHAN POLA OPERASI TERHADAP SUSUT TENAGA LISTRIK SISTEM DISTRIBUSI PLN ULP IMANDI Aulia Sandhi Kurniawan; Adisastra Pengalaman Tarigan; Hamdani
Jurnal Nasional Teknologi Komputer Vol 5 No 3 (2025): Juli 2025
Publisher : CV. Hawari

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61306/jnastek.v5i3.237

Abstract

Losses are a natural phenomenon that cannot be avoided, because they are absolute and certain to occur in the distribution of electric power. Technical losses are influenced by the type of cross-section, cross-sectional area, natural factors such as temperature, and so on. In this study, the author analyzes changes in operating patterns against losses at PT PLN ULP Imandi with a spindle system or can be supplied from other feeders. In ULP Imandi there are 3 feeders, namely SO1, SLO7, and OB2, each of which is supplied from a different GI (main substation). The purpose of this study is to analyze the technical losses that occur in ULP Imandi so that a value is obtained with the help of ETAP software which can then be used as a reference for evaluation. ULP Imandi has a feeder length of 207.22 kms with a AAAC 50mm2 cross-section of 60.093 kms, AAAC 95 mm2 of 84.273 kms, and AAACS 150 mm2 of 62.854 kms. With this data, the ideal loss value for ULP Imandi is 119,448 kWh/month.
Analisis Kinerja Sistem Proteksi Arus Lebih Pada PT. Sri Intan Karplas Industry Fajar Ahmad; Zuraidah Tharo; Dikcy Lesmana
Jurnal Nasional Teknologi Komputer Vol 5 No 3 (2025): Juli 2025
Publisher : CV. Hawari

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61306/jnastek.v5i3.238

Abstract

This research explains the positive impact of the overcurrent relay (OCR) protection system, which functions to protect against excessive currents at PT. Sri Intan Karplas Industri. Overcurrent protection is the primary means of keeping equipment safe from problems such as short circuits and overloads. This research was conducted by observing specific situations and collecting field data, including test data and calculations on the MCGG82 OCR. Testing showed that the OCR relay was still suitable for use because the difference between the tripping time during testing and the calculated time was within 5%. This research also demonstrated that the OCR system is excellent at protecting against excessive currents, which can help protect electrical power systems in industrial environments.
Peningkatan Nilai Sistem Pertanahan Pada Tower Transmisi SUTT 70 kV PLTMG Flores – Labuan Bajo Satyo Prihutomo; Adisastra Pengalaman Tarigan; Hikmatul Fadhilah Sianipar
Jurnal Nasional Teknologi Komputer Vol 5 No 3 (2025): Juli 2025
Publisher : CV. Hawari

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61306/jnastek.v5i3.241

Abstract

The construction of the 70 kV SUTT Rangko - Labuan Bajo transmission line has faced challenges in the grounding work. According to SPLN T5.012_2020, there are specific grounding requirements for the tower structures and cable parts of SUTT towers. Flores Island has mountainous and hilly terrain, with several active volcanoes, which often results in high and fluctuating soil resistivity. Improving the grounding value at the SUTT 70 kV Rangko - Labuan Bajo towers to meet SPLN T5.012_2020 standards is essential for enhancing the reliability of electrical installations and systems in Flores. Routine maintenance of the grounding system is necessary because it is crucial for protecting tower components, especially during lightning strikes. For the tower grounding improvement, the counterpoise method was used. Initial measurements showed that the grounding resistance at four tower points did not meet the required standard. This paper discusses improving the grounding value at these four towers using the counterpoise method, namely by adding stick rods to each tower leg until the required standard value is met (≤ 3 Ω for the five towers near the substation and a maximum of 10 Ω in other areas).
Penerapan Framework Codeigniter Pada Sistem Reservasi Wedding Decoration Menggunakan Pendekatan Model UML Andreansyah, Farhan; Nindyasari, Ratih; Wijayanti, Esti
Jurnal Nasional Teknologi Komputer Vol 5 No 3 (2025): Juli 2025
Publisher : CV. Hawari

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61306/jnastek.v5i3.244

Abstract

Perkembangan teknologi informasi telah membuka peluang bagi layanan penyewaan tenda dan dekorasi pernikahan untuk bertransformasi menuju sistem digital. Di Erina Tenda Jepara, salah satu tantangan utama yang dihadapi adalah kurangnya efisiensi dalam proses pengiriman gambar dekorasi dan harga paket yang masih bergantung pada cara manual, yang menghambat kelancaran dalam pemesanan. Untuk mengatasi permasalahan ini, penelitian ini bertujuan untuk merancang dan membangun sistem reservasi wedding decoration menggunakan pendekatan model UML dengan penerapan framework Codeigniter serta Bootstrap untuk antarmuka pengguna, dan MySQL untuk pengelolaan basis data. Metode pengembangan yang digunakan adalah Waterfall, yang mencakup tahapan analisis, desain, implementasi, pengujian, dan pemeliharaan. Harapannya, sistem yang dikembangkan dapat mempermudah pelanggan dalam mengakses gambar dekorasi dan harga paket secara langsung, serta meningkatkan efisiensi pengelolaan data pemesanan bagi pihak manajemen. Dengan demikian, proses pemesanan dapat berlangsung dengan lebih cepat, terorganisir, dan efisien.
Analisis Gangguan Hubung Singkat dan Koordinasi Proteksi di Jaringan 20 KV PLTD Aneuk Laot ULP Sabang Dengan Simulasi ETAP 21.0.1 Firman Hakiki; Adi Sastra Pengalaman Tarigan; Hamdani
Jurnal Nasional Teknologi Komputer Vol 5 No 3 (2025): Juli 2025
Publisher : CV. Hawari

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61306/jnastek.v5i3.247

Abstract

Electricity plays a vital role in human life, so serious efforts are needed to ensure its reliable distribution. One of the main issues in electrical systems is short-circuit faults, which can cause equipment damage and widespread power outages. To minimize the impact of such faults, a protection system that is reliable, adequate, and well-coordinated is essential. A good protection system must meet several criteria, such as proper selectivity, the ability to quickly respond to disturbances to reduce equipment damage, high sensitivity to detect even the smallest faults based on regulated current levels, and efficient coordination and backup in case the main protection fails. It must also remain stable against external disturbances. To achieve reliable protection coordination, simulation is necessary. One tool that can be used is ETAP 21.0.1 software. ETAP helps in modeling the electrical network, calculating short-circuit currents, and evaluating the performance of primary and secondary protection coordination. The simulation results show that short-circuit current values vary at each busbar point depending on the system impedance and network configuration. Through this simulation, settings like the Time Multiplier Setting (TMS) and pickup current can be adjusted to improve relay coordination, making it more selective and reliable. This study provides valuable insight into the reliability and safety of the electricity distribution operating system in the Sabang ULP area.
ANALISIS PENGUJIAN KAPASITAS BATERAI 220 VDC UNTUK KEANDALAN PLTGU UNIT PEMBANGKITAN (UP) BELAWAN Wahyu Desmandra; Dino Erivianto; Rahmaniar
Jurnal Nasional Teknologi Komputer Vol 5 No 3 (2025): Juli 2025
Publisher : CV. Hawari

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61306/jnastek.v5i3.248

Abstract

This study aims to analyze the capacity of a 220 VDC battery used in the acoustic system of the Gas and Steam Power Plant (PLTGU) at the Belawan Generating Unit (UP). Batteries have an important role as a backup energy source in maintaining the continuity of the electrical operational system, especially in emergency conditions. The research method includes testing the battery capacity by measuring current, voltage, and discharge time under various load conditions. The test results show that battery capacity can vary depending on temperature, age, and previous charging conditions. The data obtained are explained to rotate the battery performance in supporting the PLTGU system. This conclusion provides recommendations for routine maintenance and battery replacement, to ensure the electrical system at the Belawan UP continues to function optimally. This research is expected to be a reference for PLTGU managers in improving the efficiency of the power plant system.

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