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Freddy Kurniawan
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Department of Electrical Engineering Institut Teknologi Dirgantara Adisutjipto, Jl. Janti, Blok R, Lanud Adisutjipto, Yogyakarta
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Aviation Electronics, Information Technology, Telecommunications, Electricals, Controls (AVITEC)
Published by Institut Teknologi Dirgantara Adisutjipto
ISSN : 26852381     EISSN : 27152626     DOI : 10.28989/avitec
Core Subject : Science, Engineering,
Aerospace Engineering Computer Science & IT Electrical & Electronics Engineering Engineering
This journal is the scientific publications journal published by Department of Electrical Engineering, Sekolah Tinggi Teknologi Adisutjipto. It aims to promote and disseminate the research finding in the development of management theories and practices. It will provide a platform for academicians, researchers, and practitioners to share their experience and solution to problems in different areas of journal scopes. Every submitted paper will be blind-reviewed by peer-reviewers. Reviewing process will consider novelty, objectivity, method, scientific impact, conclusion, and references.
Arjuna Subject : Teknik (semua kategori) - Teknik Listrik dan Elektro
Articles 168 Documents
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Host-Based Intrusion Detection with System Call Sequences: Window Localization and Forensic Narratives Qi Xin
Aviation Electronics, Information Technology, Telecommunications, Electricals, and Controls (AVITEC) Vol 8, No 2 (2026): August
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28989/avitec.v8i2.3973

Abstract

Host-based intrusion detection systems (HIDS) and endpoint detection and response platforms increasingly rely on high-volume host telemetry such as system-call and API-call sequences. Accurate trace classification is useful, but operational response also requires localization of the suspicious fragment and a readable evidence narrative. This paper presents an analyst-oriented HIDS workflow with three stages: window-based detection using 3-gram logistic regression, 1D CNN, BiLSTM with attention pooling, and Transformer encoder models; suspicious-window localization using maximum-probability window selection and attention attribution; and evidence-grounded forensic narrative generation from the same localized evidence. The main ADFA-LD evaluation uses 1,263 training traces and 316 test traces; the best detector, 3-gram logistic regression with W=100, achieves precision 0.958, recall 0.913, F1 0.935, and AUROC 0.980. To address dataset-size and cross-telemetry concerns, this study adds two bounded additional evaluations: an eight-family Windows API-call sequence experiment on Mal-API-2019 and a large NetFlow stress test on NF-ToN-IoT-v3 with 10,000, 20,000, 50,000, and 100,000 training records. The NetFlow experiment shows that deep models become more stable as data volume increases, but the linear baseline remains strongest at 100,000 records (F1=0.888), while the Transformer improves to F1=0.856. These results support a careful conclusion: larger datasets help deep models, but they do not automatically make a Transformer outperform a strong shallow baseline when the signal is dominated by compact local motifs or well-separated tabular flow features.
Development of a Fuzzy Logic Health Index for Generator Stator Insulation Condition Assessment Muhamad Arief Afandy; Agung Trihasto; Risky Via Yuliantari
Aviation Electronics, Information Technology, Telecommunications, Electricals, and Controls (AVITEC) Vol 8, No 2 (2026): August
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28989/avitec.v8i2.4082

Abstract

Stator insulation breakdown is the primary cause of generator failures, driven by cumulative thermal, electrical, and mechanical stresses. For generator Unit 2 at PLTU Palabuhan Ratu Coal-Fired Power Plant, the Mamdani fuzzy logic model provides an automated, rule-based diagnostic assessment utilizing tip-up tan delta, AC leakage current, and partial discharge measurements. This model predicts the Health Index of generator phases using historical test data 2019, 2023, and 2025. It successfully classifies phases R, S, and T into the "Poor" category. Model validation yields an error of 0.6% and passes monotonicity tests, sensitivity analysis, and boundary testing. Partial discharge is the most dominant parameter with a potential health index reduction of 44.3 points. The main novelty is integrating the three dielectric parameters into a Mamdani fuzzy model adapted to MELCO and IEC standards for generators in tropical environments.
Zero Trust Multi-Factor Authentication for Secure Digital Payments: Design and Implementation Farrel Alfared Carasiola; Rakhmadi Irfansyah Putra
Aviation Electronics, Information Technology, Telecommunications, Electricals, and Controls (AVITEC) Vol 8, No 2 (2026): August
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28989/avitec.v8i2.4114

Abstract

Digital payment security requires robust access protection against unauthorized login attempts, credential misuse, and device-based threats. This study designs and implements a Zero Trust architecture-based Multi-Factor Authentication (MFA) prototype to strengthen access control in digital payment applications. The proposed system integrates password-based authentication, Time-Based One-Time Password (TOTP), device-trust evaluation, adaptive step-up authentication, rate limiting, and audit logging in a single authentication workflow. The novelty lies in integrating Zero Trust principles with MFA and device-based contextual verification, so access decisions consider both user credentials and device trust. The prototype was implemented using a client-server architecture with Flask as the backend and PostgreSQL as the database. Evaluation was conducted using 50 automated test cases across five authentication scenarios: valid registered-device login, invalid password, invalid OTP, new-device login, and expired OTP. The results show that the proposed system achieved 100% detection accuracy, 0% Attack Success Rate (ASR), 0% False Acceptance Rate (FAR), 0% False Rejection Rate (FRR), 100% Authentication Success Rate, and 100% Step-Up Trigger Rate. Performance testing showed an average authentication latency of 197.45 ms with a standard deviation of 5.18 ms, indicating stable and responsive authentication performance. A preliminary usability assessment also indicated that the login, TOTP verification, and step-up authentication workflow remained understandable without unnecessary authentication friction. Overall, the proposed prototype provides a practical baseline for strengthening digital payment access security through Zero Trust-based MFA and context-aware authentication.
User Adaptation to Satellite Internet in Indonesian Archipelagic Regions: A Qualitative Case Study M. Haikal Ramadhan; Gunawan Wibisono
Aviation Electronics, Information Technology, Telecommunications, Electricals, and Controls (AVITEC) Vol 8, No 2 (2026): August
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28989/avitec.v8i2.4191

Abstract

Archipelagic regions often experience limited telecommunications infrastructure, resulting in unequal Internet access and persistent digital connectivity challenges. Satellite Internet has emerged as a potential solution for expanding broadband access in geographically isolated areas. This study explores user adaptation to satellite Internet technology in the Riau Islands Province, Indonesia. A qualitative case study approach was employed using in-depth interviews, field observations, and documentation involving four active Starlink users selected through purposive sampling. The findings indicate that participants adopted satellite Internet because conventional terrestrial networks could not provide reliable connectivity. Following adoption, users gradually integrated the technology into their daily activities while adapting to weather-related disruptions, antenna positioning, and relatively high subscription costs. Four interrelated dimensions of post-adoption adaptation emerged from the analysis: technical, social, economic, and functional adaptation. The study contributes by proposing an exploratory user-centered framework that explains post-adoption adaptation to satellite Internet in an archipelagic context and extends the Diffusion of Innovation perspective beyond initial adoption. The findings also provide practical insights for service providers and policymakers seeking to improve digital connectivity and digital inclusion in geographically underserved regions.
Yagi-Uda Antennas for Private LTE Band 3 FDD: Simulation, Fabrication, and Measurement Muhammad Rizko Justiano; Aryanti Aryanti; Mohammad Fadhli
Aviation Electronics, Information Technology, Telecommunications, Electricals, and Controls (AVITEC) Vol 8, No 2 (2026): August
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28989/avitec.v8i2.4168

Abstract

Private LTE Band 3 Frequency Division Duplex (FDD) systems require dedicated uplink and downlink antennas to improve channel isolation and communication reliability. However, experimentally validated split-frequency Yagi-Uda antennas for Software Defined Radio (SDR)-based base stations remain limited. This study presents the design, simulation, fabrication, and experimental validation of two four-element Yagi-Uda antennas operating at 1.840 GHz for downlink (DL) and 1.750 GHz for uplink (UL). Each antenna consists of one reflector, one driven element, and two directors fabricated from 6 mm diameter aluminum rods. The antenna dimensions were optimized using the Trust Region Framework in CST Studio Suite 2024 to achieve optimal impedance matching. Simulation results produced S11 values of −35.33 dB (DL) and −30.76 dB (UL), VSWR values of 1.035 and 1.059, and forward gains of 9.10 dBi and 8.38 dBi, respectively. Measurements using a NanoVNA over the 1.4–2.1 GHz frequency range yielded S11 values of −18.98 dB (DL) and −26.92 dB (UL), with corresponding VSWR values of 1.253 and 1.094. The measured resonant frequencies closely agreed with the simulation results, with a maximum deviation of only 1 MHz. The novelty of this work lies in the experimental validation of a low-cost, split-frequency, four-element aluminum-rod Yagi-Uda antenna pair that operates without an external impedance-matching network. These results demonstrate the suitability of the proposed antennas for SDR-based Private LTE Band 3 base station applications.
VHF Doppler Radio Direction Finding Using an Eight-Element Switched Antenna Array Arif Basuki; Denny Dermawan; Diah Suwarti Widyastuti; Bagas Nur Susanto; Adi Setiawan
Aviation Electronics, Information Technology, Telecommunications, Electricals, and Controls (AVITEC) Vol 8, No 2 (2026): August
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28989/avitec.v8i2.4018

Abstract

Communication between radio transmitters and receivers is commonly evaluated based on signal quality, while the direction of arrival (DoA) of the signal is less frequently exploited in conventional communication systems. This study presents the design and preliminary field validation of a Doppler-based Radio Direction Finder (RDF) operating in the Very High Frequency (VHF) band using an eight-element switched antenna array. The proposed system applies a single-receiver pseudo-Doppler architecture in which eight antenna elements are sequentially switched to emulate virtual antenna rotation and generate a Doppler-modulated audio-frequency signal. The signal is processed through filtering, zero-crossing detection, and phase-based bearing estimation, and the resulting direction is displayed using a 16-segment circular LED indicator with 22.5° angular resolution. Field measurements were conducted at three locations in the 144–146 MHz band, with transmitter–receiver distances ranging from approximately 100 m to 1,500 m. The measured angular errors were 4.455°, 7.551°, and 5.154°, corresponding to relative angular errors of 1.24%, 2.10%, and 1.43%, respectively, with an average relative angular error of approximately 1.59%. These results indicate that the proposed eight-element pseudo-Doppler RDF prototype can provide practical bearing estimation under the tested VHF field conditions. However, further experiments involving more azimuth angles, repeated measurements, and direct comparison with a four-element configuration are required to confirm robustness and quantify the performance improvement of the proposed system.
AVX2 SIMD Optimization for DSP Load and QoS in a srsRAN-Based Private LTE Network Muhammad Arcy Alfaathir; Sopian Soim; Mohammad Fadhli; Achmad Aflah Jamazy
Aviation Electronics, Information Technology, Telecommunications, Electricals, and Controls (AVITEC) Vol 8, No 2 (2026): August
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28989/avitec.v8i2.4147

Abstract

Private 4G LTE networks built on open-source platforms provide cost-effective localized connectivity. However, executing baseband Digital Signal Processing (DSP) imposes a massive computational burden on general-purpose CPUs. This study evaluates the correlation between DSP load and end-to-end Quality of Service (QoS) in a USRP B210-based Private 4G LTE prototype using srsRAN and Open5GS. To prevent CPU saturation, Advanced Vector Extensions 2 (AVX2) SIMD instructions and CPU core affinity were applied. The experimental design evaluated the system using two concurrent User Equipment (UEs) under Line-of-Sight (LOS) outdoor conditions. Compared to a non-optimized baseline, the AVX2 optimization successfully stabilized the host processor at a 60.8% peak load and achieved a downlink throughput of 35.3 Mbps without radio underflows. However, multiplexing complex baseband signals under heavy concurrent traffic severely congested the OS-level queues. This caused severe bufferbloat, escalating the average end-to-end latency to 2021 ms compared to its idle state. These findings demonstrate that while AVX2 optimization resolves the CPU bottleneck, software-induced bufferbloat remains the primary limitation in SDR deployments.
Integration of Automatic Cleaning and Adaptive Cooling for Soiling Mitigation in Solar Panel Maintenance Pelangi Firmansyah; Agung Trihasto; Dwi Novianto
Aviation Electronics, Information Technology, Telecommunications, Electricals, and Controls (AVITEC) Vol 8, No 2 (2026): August
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28989/avitec.v8i2.4187

Abstract

The accumulation of soiling on the surface of the solar panel module inhibits the process of absorbing sunlight and causes uneven heat distribution, thus impacting the decline in solar panel performance. This study introduces a new solar panel maintenance mechanism through the integration of cleaning and cooling with voltage drop detection, weather condition, temperature monitoring and centralized control features based on the ESP32 microcontroller. The primary contribution is the system-level integration of previously separate maintenance mechanism functions into a conditionally integrated control architecture. The implementation of the cleaning mechanism is carried out based on the detection of a voltage drop below the baseline persistently for 30 minutes as a temporal filter to prevent momentary maintenance. Meanwhile, the adaptive cooling mechanism through the detection of the DS18B20 temperature sensor controls the activation of the water pump motor when the temperature is > 40 °C and is inactive when the temperature is ≤ 25 °C. Both maintenance methods are complemented by LDR and rain sensors for adaptive operation to the environment. At prototype scale, the maintained panel recorded an average voltage of 13.22 V and average temperature of 34.06 °C, compared to 12.71 V and 40.59 °C for the unmaintained panel. This represents a 4.013% increase in output voltage and a 16.09% decrease in temperature, both statistically significant (paired t-test, p<0.001). These test findings are based on voltage and temperature parameters. Power output and electrical energy were not directly measured, so the results represent prototype-level operational feasibility, not overall efficiency improvements.

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