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Nyoman Gunantara
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Program Studi Teknik Elektro Fakultas Teknik, Universitas Udayana Jl. Kampus Bukit Jimbaran
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Jurnal SPEKTRUM
Published by Universitas Udayana
ISSN : 23023163     EISSN : 26849186     DOI : https://doi.org/10.24843/SPEKTRUM
Core Subject : Science, Engineering,
Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering
Jurnal SPEKTRUM is peer review journal, published four times a year by the Department of Electrical Engineering, Faculty of Engineering, Universitas Udayana. This journal discusses the scientific works containing results of research in the field of electrical, include: power systems, telecommunications, computers, informatics, controls, and electronics. Authors are expected to include original scientific papers in accordance with the scope of the discussion of this journal including all aspects of the theory and practice are used.
Arjuna Subject : Teknik (semua kategori) - Teknik Listrik dan Elektro
Articles 30 Documents
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PERANCANGAN SPBKLU SEPEDA MOTOR LISTRIK DAN PEMILIHAN LOKASI PEMASANGAN DI BALI SELATAN N. W. Sindi; D. A. S. Santiari; I. A. D. Giriantari; W. G. Ariastina; I W. Sukerayasa; I N. S. Kumara; I N. Setiawan
Jurnal SPEKTRUM Vol. 12 No. 3 (2025): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/SPEKTRUM.2025.v12.i03.p22

Abstract

The limited availability of fossil fuel reserves and the fact that their formation takes millions of years have driven the accelerated adoption of electric vehicles as a strategic step to reduce carbon emissions. Bali, as one of the leading regions in the clean energy transition, requires adequate infrastructure support, particularly charging stations as the main facilities for electric vehicles, whose development must take into account proper location selection and design. This study focuses on the design and location selection of battery swapping stations for electric motorcycles (SPBKLU) in South Bali, including three-dimensional designs and electrical layouts, as well as location determination using the Analytical Hierarchy Process (AHP) method by evaluating potential sites. The results of this study are one optimal location for SPBKLU installation, accompanied by a three-dimensional design suited to the site’s characteristics and the SPBKLU’s electrical layout. In the future, it is expected to serve as a study and reference for the development of electric vehicle infrastructure in Bali, accelerating public adaptation to this technology.
ANALISIS TEKNIS DAN KELAYAKAN EKONOMI SISTEM PEMBANGKIT LISTRIK TENAGA PLTB TURBIN TULIP DAN PLTS MENGGUNAKAN SIMULASI HOMER PRO I M Dwijaksana; I W Sukerayasa; I G N Janardana; C G I Partha C G I Partha; P A Mertasana; A A G M Pemayun
Jurnal SPEKTRUM Vol. 12 No. 3 (2025): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/SPEKTRUM.2025.v12.i03.p23

Abstract

The horizontal axis wind turbine in the smart microgrid system at DH Building, Faculty of Engineering, Udayana University, is not operating optimally due to blade damage. This study aims to evaluate the replacement of the horizontal wind turbine with a tulip-type wind turbine and to analyze its economic feasibility. Simulation and optimization were carried out using HOMER Pro software, considering the local wind and solar energy potential. The simulation results indicate an annual energy production of 103,205 kWh, with contributions from the PV system at 61.5% and the wind turbine at 38.5%. From an economic perspective, the project yields a Net Present Cost (NPC) of Rp 1,668,925,000, a Levelized Cost of Energy (LCoE) of Rp 4,368.36/kWh, and a Payback Period of 16 years and 8 months. The feasibility analysis results in a Net Present Value (NPV) of –Rp 308,312,810.02 and a Profitability Index (PI) of 0.7635. These findings demonstrate that the project is not financially feasible under the PLN tariff of Rp 1,699.53/kWh and a discount rate of 8.5%.
RANCANG BANGUN SISTEM MONITORING IOT PADA PENGISIAN BATERAI SEALED LEAD ACID BERBASIS APLIKASI MOBILE UNTUK MENCEGAH OVERHEATING DAN OVERCHARGING Rizal W.H. Siagian; Leonardus Guido Adi Wungo; Rodrick Benediktus Kainama; I Gusti Agung Putu Raka Agung; Made Sudarma
Jurnal SPEKTRUM Vol. 12 No. 3 (2025): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/SPEKTRUM.2025.v12.i03.p24

Abstract

Sealed Lead Acid (SLA) batteries are prone to damage caused by overcharging and overheating during the charging process. To address this issue, this study aims to design and develop an Internet of Things (IoT)-based monitoring system integrated with a mobile application to wirelessly monitor the charging of two SLA batteries, as well as prevent overheating and overcharging. The system employs the INA219 sensor to measure voltage and current, and the DS18B20 sensor to measure temperature. Current, temperature, and voltage data are transmitted to Firebase using an ESP32 microcontroller and displayed on an Android application called MySyM, developed with Android Studio. This research successfully realizes a functional, accurate, and effective IoT-based monitoring system to enhance the safety of SLA battery charging. The analysis of test results for the INA219 and DS18B20 sensors shows a Mean Absolute Error (MAE) of 0.24995 V for voltage and 2.1068 °C for temperature on the 12 V battery, as well as 0.1299 V for voltage and 1.3295 °C for temperature on the 6 V battery, demonstrating high measurement accuracy.
PENGEMBANGAN SISTEM OTOMATISASI PENGENDALI ALAT PENDINGIN BERDASARKAN SUHU RUANGAN DENGAN MENGGUNAKAN SENSOR LM35 I Gede Ketut Ari Wirawan; I Made Anggi Wahyudi Artha; Rukmi Sari Hartati; Ida Bagus Gede Manuaba
Jurnal SPEKTRUM Vol. 12 No. 3 (2025): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/SPEKTRUM.2025.v12.i03.p15

Abstract

Indoor temperature and humidity control plays an important role in creating a comfortable and energy-efficient environment, especially in tropical areas such as Denpasar, Bali. Manual use of air conditioners (AC) is often less than optimal because it does not consider the actual environmental conditions as a whole. This study designs an AC control automation system based on the Internet of Things (IoT) concept that can be controlled via a web interface. This system combines several sensors, such as LM35 for temperature, DHT22 for humidity, and PIR for motion detection, and is controlled by an Arduino UNO microcontroller. In addition, data transmission is carried out via the HM-10 Bluetooth module and a web-based monitoring interface built using the Python programming language. The developed system is able to display temperature, humidity, and user presence data in real time, and automatically regulates AC operation based on these environmental conditions. Tests show that the LM35 sensor has an error of 1,42% and the DHT22 sensor is 0.73%, with an effective range of PIR and IR sensors of up to 4 meters. Overall, this system has succeeded in saving AC energy consumption by up to 35.49%. Based on these results, this system is considered feasible to be applied in real environments as an efficient and adaptive temperature control solution.
OPTIMALISASI DETEKSI WAJAH DLIB-HOG PADA CITRA INTENSITAS RENDAH DENGAN PREPROCESSING CLAHE David Clemens Sumampouw; Prahasta Napolado Damanik; Feliks Sinaga; I Made Oka Widyantara; Ngurah Indra ER
Jurnal SPEKTRUM Vol. 12 No. 3 (2025): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/SPEKTRUM.2025.v12.i03.p25

Abstract

Face decection using Dlib-HOG offers high performance under ideal lighting condition but significantly degrades when applied to low-light images. This study evaluates the effectiveness of Contrast Limited Adaptive Histogram Equalization (CLAHE) as a preprocessing method to enhance face detection accuracy under poor lighting conditions. CLAHE is applied to grayscale images to improve local contrast without introducing excessive artifacts, thereby making facial features more distinguishable for the HOG-based algorithm. Experiments were conducted on a facial image dataset with varied lighting conditions, comparing detection results before and after preprocessing. The results show a notable improvement in detection accuracy from 85.7% to 96.4% and a reduction in false negatives, with only a minimal increase in processing time. These findings confirm that CLAHE is an efficient and lightweight enhancement technique for improving the performance of Dlib-HOG on low-quality images.
EVALUASI KUALITAS TEKNIS SISTEM INFORMASI ADMINISTRASI COASS MENGGUNAKAN GOOGLE LIGHTHOUSE Made Dhyo Pradnyadiva; Ngurah Indra ER; Fajar Purnama; Komang Sri Utami; I Wayan Shandyasa
Jurnal SPEKTRUM Vol. 12 No. 4 (2025): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

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

Abstract

The successful adoption of an information system is highly dependent on its technical quality, including performance, accessibility, adherence to Best Practices, and SEO compliance. This study aims to evaluate the technical quality of a web-based information system for Coass (clinical internship) administration using Google Lighthouse. The audit was conducted on three key user interfaces: the Admin, Doctor, and Student Dashboards. The evaluation focused on four main categories: Performance, Accessibility, Best Practices, and SEO. The results demonstrated outstanding scores across all tested pages, with Performance scoring between 99–100, Accessibility at 95–96, and perfect scores (100) in both Best Practices and SEO. These results confirm that the system exhibits a high level of technical quality and aligns with modern web development standards. The findings indicate that the system delivers not only functional capabilities but also speed, reliability, and a highly optimized user experience.
PENERAPAN TEKNOLOGI TEPAT GUNAALAT SIRAT (SPLIT DAN IRAT) SEBAGAI UPAYA PEMERDAYAAN PENGRAJIN BAMBU DI DESA KAYUBIHI I G N Arya Bayu Kartika; D N Agung Nareswara Natha; I Kadek Deni Saputra; Gusti Ngurah Janardana
Jurnal SPEKTRUM Vol. 12 No. 4 (2025): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

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

Abstract

Kayubihi Village, Bangli District, Bali, has great potential in the bamboo craft industry because 15% of its population works as craftsmen. However, limited traditional tools lead to low productivity and low quality results. This study aims to analyze the effectiveness of the use of the SIRAT (Split and Irat) tool in increasing the efficiency and productivity of craftsmen. The research method used is descriptive quantitative through structured observation and questionnaires. The results showed that the SIRAT tool can reduce processing time, from 35 seconds to 2 seconds in the split process, and from 73 seconds to 50 seconds in the irat process. Average split production increased from 0.57–1.42 stems per day to 1.85–3.42 stems, while irat production increased from 50.29–125.71 stems to 163.43–301.71 stems per day, or equivalent to an increase of 130%–225%. In addition, this tool produces more uniform bamboo sizes, reduces labor load, and reduces the risk of work accidents. Thus, the application of the SIRAT tool has proven effective in increasing productivity and quality of results, while also supporting Kayubihi Village as a bamboo craft center.
PERANCANGAN SPKLU SEPEDA MOTOR LISTRIK DAN PEMILIHAN LOKASI PEMASANGAN DI BALI SELATAN N. M. G. A. Krisnayani; I N. S. Kumara; I N. Setiawan; W. G Ariastina; I W. Sukerayasa; I. A. D. Giriantari; D. A. S. Santiari
Jurnal SPEKTRUM Vol. 12 No. 4 (2025): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

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

Abstract

Indonesia is currently in a transition toward clean energy. Therefore, accelerating the adoption of Electric Vehicles (EVs) as a replacement for fossil-fueled vehicles has become a strategic step that is being actively promoted. To support this, the availability of adequate infrastructure is a key factor, with charging stations serving as the main infrastructure for electric vehicles. For optimal operation, the development of charging stations requires proper location selection and design. This study focuses on the design and location selection of Public Electric Vehicle Charging Stations (SPKLU) intended for electric motorcycles in the South Bali region. The design features a three-dimensional model of the charging station, along with its corresponding electrical plan. Meanwhile, location selection is carried out using the Analytical Hierarchy Process (AHP) method by evaluating potential sites. The outcome of this study is the identification of the best location for installing the SPKLU, accompanied by design suited to the site’s characteristics and the SPKLU’s electrical design. It is expected that this work can serve as a study and reference for further development to accelerate the adoption of electric vehicles in Bali.
PERANCANGAN DIRECT CHARGING SEPEDA MOTOR LISTRIK DAN PEMILIHAN LOKASI PEMASANGAN DI BALI SELATAN I N. A. P. Putra; I W. Sukerayasa; W. G Ariastina; I N. S. Kumara; I N. Setiawan; I. A. D. Giriantari; D. A. S. Santiari
Jurnal SPEKTRUM Vol. 12 No. 4 (2025): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

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

Abstract

Bali is one of the regions in Indonesia at the forefront of the transition toward clean energy. One of the key steps to achieving this goal is the shift to electric vehicles (EVs). Therefore, the design of electric vehicle charging stations is a crucial factor in ensuring a smooth transition. Charging stations must be strategically located to provide easy access for users, and their planning must comply with existing regulations. One type of charging station is the Public Electric Vehicle Charging Station (SPKLU). However, most SPKLUs are focused on electric cars, whereas the use of electric motorcycles is far more widespread. For this reason, this study focuses on the design of a direct charging system for electric motorcycles, which can be connected directly to the vehicles. The design process includes both 3D modeling and the electrical layout. The selection of a suitable location will be carried out using the Analytic Hierarchy Process (AHP) to determine the optimal site in the South Bali area
ANALISIS KINERJA KODE BOSE CHAUDHURI HOCQUENGHEM PADA DIRECT SEQUENCE SPREAD SPECTRUM PADA KANAL FREKUENSI SELECTIVE FADING Wahyu Sahputra; Nyoman Pramaita; Nyoman Gunantara
Jurnal SPEKTRUM Vol. 12 No. 4 (2025): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

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Abstract

This study aims to analyze the performance of Bose Chaudhuri–Hocquenghem (BCH) coding (7,4) in a Direct Sequence Spread Spectrum (DSSS) system using Pseudo Noise (PN) spreading code, under frequency selective fading and white Gaussian noise (AWGN) channel conditions. Simulations were performed using MATLAB Simulink to compare the system performance against Bit Error Rate (BER) at various values of bit energy to noise power density (Eb/No). The simulation results show that the use of BCH generally improves system performance by significantly reducing the BER value. At high Eb/No, the performance of PN + BCH is slightly better. This indicates that the effectiveness of signal coding and spreading is strongly influenced by channel conditions and noise levels. Code length, spreading type, and error correction method play an important role in optimizing digital communication performance.

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