Article Per Year (5 Year)
p-Index From 2021 - 2026
4.44
P-Index
This Author published in this journals
All Journal Jurnal Keteknikan Pertanian Komunikasi Fisika Indonesia TELKOMNIKA (Telecommunication Computing Electronics and Control) Indonesian Journal of Electrical Engineering and Informatics (IJEEI) Pendidikan Ekonomi Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Journal of Aceh Physics Society JOURNAL ONLINE OF PHYSICS Unri Conference Series: Community Engagement UNES Journal of Swara Justisia JRAP (Jurnal Riset Akuntansi dan Perpajakan) Science, Technology, and Communication Journal Al-kayyis: Journal of Islamic Education
Defrianto Defrianto
Unknown Affiliation
Religion Agriculture, Biological Sciences & Forestry Humanities Computer Science & IT Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Physics Social Sciences Other

Published : 54 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 54 Documents
Search

 2   3   4   5   6 
Optimization of heart rate measurement using fast Fourier transform modeling on electrocardiogram signals Siti Fatimah; Defrianto Defrianto
Science, Technology, and Communication Journal Vol. 6 No. 2 (2026): SINTECHCOM Journal (February 2026)
Publisher : Lembaga Studi Pendidikan dan Rekayasa Alam Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59190/stc.v6i2.313

Abstract

Heart rate measurement based on electrocardiogram (ECG) signals is commonly performed through traditional observation techniques, which can be less effective especially when restricted to short-range. Such limitations may hinder the detection of subtle variations in cardiac rhythm, potentially resulting in the omission of critical time-dependent physiological information. To overcome this challenge, a computational approach is introduced to enhance both the accuracy and consistency of heart rate estimation. The fast Fourier transform (FFT) is applied to convert ECG signals from the time domain to the frequency domain, allowing for accurate identification of dominant spectral components associated with cardiac activity. This transformation also enables the evaluation of long-range, which is often impractical to analyze using time-domain methods alone. A dataset consisting of ten ECG signal recordings from subjects with normal heart function was utilized. Waveform images were digitized using PlotDigitizer software and further processed in MATLAB through spectral transformation. The resulting frequency components were accurately identified, with a mean absolute error of less than 0.2% when compared to reference values. These results demonstrate the effectiveness of a frequency-based analytical approach in improving measurement precision and promoting efficiency in digital cardiac monitoring. The findings contribute to the development of advanced biomedical signal processing techniques.
Analysis of bending losses in single-mode optical fiber for determining optical signal quality Fatima Nur Ramadhani; Saktioto Saktioto; Zulkarnain Zulkarnain; Defrianto Defrianto; Mohammed M Fadhali
Science, Technology, and Communication Journal Vol. 5 No. 3 (2025): SINTECHCOM Journal (June 2025)
Publisher : Lembaga Studi Pendidikan dan Rekayasa Alam Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59190/stc.v5i3.324

Abstract

Optical fiber is an advanced transmission medium composed of glass fibers, offering significantly higher data transfer speeds compared to conventional electrical cables. This study aims to analyze power loss resulting from bending in single-mode optical fibers (SMF) to assess the impact on optical signal quality. Five distinct SMF types were simulated using OptiFiber software at wavelengths of 1310 nm and 1550 nm, with bending radii varying from 20 – 46 mm in increments of 2 mm. The results demonstrate that power attenuation in optical fibers is affected by the wavelength of operation and bend radius. At a wavelength of 1310 nm, the highest material loss was recorded in SMF-28 at 0.0125 dB/km, whereas at 1550 nm, SMF-28 exhibited the highest material loss of 31.963 dB/km. Moreover, an increase in bending radius results in a reduction of bending losses, while a decrease in bending radius leads to a significant increase in losses. These insights contribute to the development of improved fiber optic cable designs by advocating the use of enhanced protective shielding to mitigate bending-induced signal degradation.
Ultra-wideband diamond-shaped metamaterial absorber for radar cross section reduction Defrianto Defrianto; Erwin Kurnia; Saktioto Saktioto; Tengku Emrinaldi; Feby Nur Sakinah; M Ikhsan; Vepy Asyana; Yan Soerbakti
Science, Technology, and Communication Journal Vol. 6 No. 2 (2026): SINTECHCOM Journal (February 2026)
Publisher : Lembaga Studi Pendidikan dan Rekayasa Alam Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59190/stc.v6i2.340

Abstract

This study presents the design and full-wave simulation of a diamond-shaped metamaterial absorber configured in a 4×4 array for applications in radar cross section reduction (RCSR). The structure was modeled on an FR-4 substrate with a copper patch and metallic ground plane to achieve high absorption across the ultra-wideband (UWB) frequency range of 0.09 – 10 GHz. Simulations were conducted using CST Studio Suite. Key radar-related performance parameters including reflection (S11), transmission (S21), and absorption were analyzed. Results indicate that the absorber achieves extremely low reflection values (return loss up to -85 dB), near-zero transmission due to the ground plane, and absorption exceeding 80% in targeted radar bands. These findings demonstrate the high potential of diamond-shaped metamaterial absorbers for stealth applications and electromagnetic wave attenuation in modern radar systems.
Airflow vibration of diaphragmatic breathing: model and demonstration using optical biosensor Toto Saktioto; Defrianto Defrianto; Nurfi Hikma; Yan Soerbakti; Syamsudhuha Syamsudhuha; Dedi Irawan; Okfalisa Okfalisa; Bambang Widiyatmoko; Dwi Hanto
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 21, No 3: June 2023
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v21i3.23613

Abstract

Optical fiber is increasingly popular and appreciated as a modern sensor technology in various sectors, one of which is for medical functions. This study was conducted to detect human diaphragmatic breathing flow using theoretical and experimental approaches. Initially, the lung model was formed using the finite element method and the Navier-Stokes equation by applying the principles of momentum and continuity. Furthermore, fiber Bragg grating (FBG) and single mode fiber (SMF) were experimentally designed with sinusoidal patterned macro-scale bending as a stretch sensor in a breathing belt applied to the diaphragm. The simulation model shows the airflow velocity increases up to 4 m/s when it flows into smaller branches. While the experimental results show that the largest power loss occurs at a buffer diameter of 0.8 cm. The power loss detected in SMF is a maximum of -0.18 dBm during inhalation and a minimum of -0.28 dBm during expiration. However, FBG bending is superior with high sensitivity.
Co-Authors Ade Saputra Agrina, Agrina Andika Thoibah Andika Thoibah Andri Saputra Anita, Sofia Awitdrus Awitdrus, Awitdrus Azura ' Bambang Widiyatmoko Busmayaril Busmayaril Debora M Sinaga dedi irawan Dedi Irawan Dedi Irawan Dedi Irawan Dewi Indriyani Roslim Dewi Indriyani Roslim Dino Yanuardi Dwi Hanto Dwi Putri Cahya Safitri Eri Wiyadi Ernayenti, Ernayenti Erwin ' Erwin Amiruddin Erwin Erwin Erwin Kurnia Erwin, ' Fadhali, Mohammed Fatima Nur Ramadhani Feby Nur Sakinah Haryana Hairi Hazmi Wirianto Hewa Yaseen Abdullah Ika Aprilla Putri Juandi Juandi Juandi Muhammad Kisna Pertiwi Krisman ' Lazuardi Lazuardi Lazuardi Umar Lifa Anggar Mayasari Lihayardi Lihayardi M Ikhsan M. Rasyid Ridho Maksi Ginting Mbantun Ginting Meiliyah Ariani, Meiliyah Melani Seprima Minarni Shiddiq Moh Danil Hendry Gamal Mohammed M Fadhali Mutathahirin, Mutathahirin Mutiara Akhdesia Nando Pratama Nuraina Fika Lubis Nurfi Hikma Nurwijayanti Okfalisa Okfalisa Okfalisa Okfalisa Rabin, Mohammed Fisal Rahman Kurniawan Rahmi Dewi Rahmondia N. Setiadi Reynal Nur Razzaq Riad Syech Riad Syech Rika Fitri Rina Afriza Rina Amelia Rini, Ari Sulistyo Rini, Ari Sulistyo Risanto, Joko Riska Amalia Rofeah ' Romi Fadli Syahputra Rosmely, Wirna Saktioto Saktioto Saktioto Saktioto Saktioto, Saktioto Salomo ' Salomo Salomo Sandra Septiana Septi Pramuliawati Siti Fatimah Soerbakti, Yan Soerbakti, Yan Sofia Anita Suhaivi Hamdan Suhardi Suhardi Suhardi Suhardi Sultan Fiddunya Fiddunya Syahid, Syafira Irma Syahril Syahril Syamsudhuha Syamsudhuha Tengku Emrinaldi Tengku Emrinaldi Titrawani Titrawani Usman Malik Usman Malik Vepy Asyana Vepy Asyana Vepy Asyana Vira Marselly Vivina Eprillison Wahyu Candra Walfred Tambunan Wildan Adli Wima Puspita Yan Soerbakti Yan Soerbakti Yan Soerbakti Yohanes Dwi Saputra Yupapin, Preecha Zahroh, Siti Zamri Zamri Zulfa Zulfa Zulhawati Zulkarnain Zulkarnain