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All Journal ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia
DAMARDHI, SAHI RAFAEL
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Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering Engineering Environmental Science Industrial & Manufacturing Engineering

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Evaluating a Preprocessing Pipeline for Fetal Phonocardiography Using FIR Filtering DAMARDHI, SAHI RAFAEL; FARADISA, IRMALIA SURYANI; SOTYOHADI, SOTYOHADI
ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika Vol 13, No 2: Published April 2025
Publisher : Institut Teknologi Nasional, Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26760/elkomika.v13i2.155

Abstract

This study evaluates the effectiveness of a preprocessing pipeline consisting of resampling, normalization, and Finite Impulse Response (FIR) filtering to improve signal consistency for further signal analyses such as feature extraction and classification. Resampling standardizes the sampling rate to 16 kHz, ensuring uniform temporal resolution. Normalization adjusts amplitude across recordings, yielding a mean of 0,0015 and a standard deviation 0,0462. FIR filtering reduces noise, eliminating 77,69% of signal energy above 200 Hz while retaining 29,65% of the main signal. Pipeline evaluation shows a Signal-to-Noise Ratio (SNR) of -1,88 dB, indicating a significant power reduction, but normalization ensures amplitude stability. These results demonstrate that this preprocessing combination effectively reduces noise, although balancing noise reduction and signal preservation remains challenging.
SAWFIER: A Solar-Powered Reverse Osmosis Desalinator for Clean Water Solutions in Coastal Communities Fikriansyah, Dzaky Aqillah; Damardhi, Sahi Rafael; Jimmy, Jimmy
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol 10, No 1 (2025): EDISI MARET 2025
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/rekabuana.v10i1.6651

Abstract

Access to clean water remains a critical challenge for coastal communities worldwide, exacerbated by seawater intrusion, population growth, and insufficient infrastructure. Indonesia, as an archipelagic nation with extensive coastlines, faces significant disparities in clean water access, particularly in rural and underserved regions. This research develops and evaluates SAWFIER (Salt Water Purifier), a solar-powered desalination system utilizing the Reverse Osmosis (RO) principle, designed to provide sustainable clean water solutions in coastal areas. Performance testing was conducted using seawater with an initial salinity of 10,000 ppm. Key parameters, including salinity, pH, and water volume, were monitored at 5-minute intervals over a 120-minute operational period. The results demonstrated a consistent reduction in salinity to 1.36 ppt at the end of the test, with optimal performance observed up to 95 minutes, maintaining salinity levels below 1 ppt. The system generated an average daily energy output of 820.25 Wh from two 100 Wp solar panels, exceeding its energy consumption of 520.2 Wh, resulting in a surplus of 300.05 Wh. These findings highlight SAWFIER’s potential as an energy-efficient, scalable, and eco-friendly solution for addressing clean water scarcity in coastal regions. Despite challenges such as membrane fouling during prolonged operations, the system demonstrates strong alignment with Sustainable Development Goal (SDG) 6, emphasizing universal access to clean water and sanitation.
Co-Authors Fikriansyah, Dzaky Aqillah Irmalia Suryani Faradisa Jimmy Jimmy Sotyohadi