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All Journal Jurnal Pengabdian Kepada Masyarakat (Indonesian Journal of Community Engagement) Journal of Applied Geospatial Information Jurnal Kelautan Nasional Eksakta : Berkala Ilmiah Bidang MIPA Jambura Journal of Electrical and Electronics Engineering Computer Science and Information Technologies Jurnal Teknik Informatika (JUTIF) JEECS (Journal of Electrical Engineering and Computer Sciences) Jurnal Pengabdian Masyarakat Bangsa Jurnal Elektronika dan Telekomunikasi
Alajuri, M Hasbi Sidqi
Maritime Raja Ali Haji University
Agriculture, Biological Sciences & Forestry Arts Humanities Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Nursing Physics Public Health Social Sciences

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Spatial Variability of Tidal Characteristics in Bintan Coastal Waters: A Case Study of Moco Port, Bakau Bay, and Tanjung Uban Port Alajuri, M. Hasbi Sidqi; Lubis, Muhammad Zainuddin
Journal of Applied Geospatial Information Vol. 9 No. 1 (2025): Journal of Applied Geospatial Information (JAGI)
Publisher : Politeknik Negeri Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30871/jagi.v9i1.7172

Abstract

Tidal dynamics play a crucial role in coastal processes, port operations, and coastal management, particularly in regions characterized by complex oceanographic interactions such as Bintan Island, Riau Islands Province, Indonesia. This study analyzes the spatial variability of tidal characteristics in the coastal waters of Bintan Island at three observation sites, namely Bakau Bay, Tanjung Uban Port, and Moco Port, using global tidal prediction data generated by MIKE Powered by DHI and harmonic analysis based on the Admiralty method. Eight principal tidal constituents (M₂, S₂, K₁, O₁, N₂, P₁, K₂, and Q₁) were examined, and tidal types were classified using the Formzahl number. The results reveal clear spatial variability in tidal harmonic characteristics despite the close geographic proximity of the sites, with the M₂ constituent dominating tidal behavior at all locations, indicating strong lunar control. Significant contributions from diurnal constituents (K₁ and O₁) result in mixed tidal regimes, with Formzahl values of 1.10 at Bakau Bay, 0.66 at Tanjung Uban, and 1.29 at Moco, classifying all sites as mixed tides with a predominance of semidiurnal components. Variations in tidal amplitudes are closely related to local coastal morphology and exposure to open waters, with Tanjung Uban exhibiting the strongest tidal influence. This multi-location analysis provides a comprehensive understanding of spatial tidal variability in Bintan coastal waters and supports coastal planning, port management, and hydrodynamic modeling in the region.
Design, Fabrication, and Experimental Evaluation of a 435 MHz Helical Antenna for 433 MHz IoT Modules Rusfa Rusfa; Rozeff Pramana; Bavitra Bavitra; Ferly Oktavia; M. Hasbi Sidqi Alajuri; Andreas M Simannulang
Jurnal Elektronika dan Telekomunikasi Vol. 25 No. 2 (2025)
Publisher : National Research and Innovation Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/jet.813

Abstract

The rapid growth of wireless communication demands within Internet of Things (IoT) applications requires antennas that exhibit high efficiency, compact dimensions, and reliable performance in the UHF band. This study aims to design, simulate, fabricate, and evaluate the performance of a helical antenna operating at 435 MHz, with its results compared against a slot antenna. The design process was conducted using CST Studio Suite with parameter optimization to achieve an optimal configuration. The prototype was fabricated using copper wire as the radiating element and an aluminum ground plane. Experimental testing was carried out with a UHF Antenna Demonstrator, followed by validation through a 433 MHz RF module integrated with Arduino. The simulation results indicated that the optimized helical antenna achieved aVoltage Standing Wave Ratio (VSWR) of 1.8 and a gain of 11.5 dBi. In contrast, the measurement results demonstrated improved performance, with a VSWR of 1.05, a return loss of −32.4 dB, and a bandwidth of 41 MHz. Comparative analysis revealed that the helical antenna outperformed the slot antenna in terms of efficiency, directional radiation pattern, and transmission distance, reaching up to 25 m compared to 15 m for the slot antenna. These findings confirm that the helical antenna is a more suitable and effective solution for UHF IoT communication systems, providing reliable performance for modern wireless applications.
Detecting Shallow Water Submarine Cables with Single Beam Echosounder in Tidung Island M Hasbi Sidqi Alajuri; Henry M. Manik; Muhammad Zainuddin Lubis; RozeffPramana; Basyaruddin Islmail Harahap; Doli Bonardo; Marisha Pertiwi; Suhengki
Journal of Applied Geospatial Information Vol. 10 No. 1 (2026): Journal of Applied Geospatial Information (JAGI)
Publisher : Politeknik Negeri Batam

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Abstract

Detecting submarine cables in tropical shallow waters remains challenging due to environmental complexity and the similarity of backscatter signatures to other seafloor objects. This study characterizes the acoustic backscatter response of two types of submarine cables concrete-armored and non-armored in the waters of Tidung Island using a SIMRAD EK-15 and a Furuno FCV-628 echosounder operating at 200 kHz. Data processing was conducted to derive Volume Backscattering Strength (SVc) and Surface Scattering Strength (SS). Measurements of the concrete-armored cable using the Furuno system produced SVc values of −6.701 dB and −5.055 dB, and SS values of −11.855 dB and −9.510 dB, indicating high reflectivity due to the impedance contrast between concrete and seawater. In contrast, measurements of the non-armored cable using the SIMRAD system yielded SVc values of −11.547 dB and −12.600 dB and SS values of −14.612 dB and −15.665 dB, reflecting weaker and more variable returns caused by direct exposure of the cable structure to sediments and hydrodynamic forces. The consistent differences between the two cable types demonstrate that each structure exhibits a distinctive acoustic signature that can be used as a discriminating parameter for mapping. This study provides important empirical evidence by presenting direct acoustic backscatter characterization of submarine cables in Indonesia and demonstrates that commercial echosounders can reliably support infrastructure inspection in shallow-water environments.
Implementation of IoT-based water quality monitoring instruments in cantang grouper cultivation ponds Hollanda Arief Kusuma; M Hasbi sidqi Alajuri; Anggarudin Anggarudin; Dwi Eny Djoko Setyono; Henky Irawan
Computer Science and Information Technologies Vol 6, No 3: November 2025
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/csit.v6i3.p235-244

Abstract

Grouper fish farming in Indonesia has great potential, but water quality management remains a challenge. Manual monitoring at hatchery D-Marine aquaculture struggles to detect sudden changes, risking mass mortality. This study developed an IoT-based water quality monitoring system using an ESP32 microcontroller, DS18B20 temperature sensors, pH sensors, dissolved oxygen (DO) sensors, a micro-SD card, an organic light emitting diode (OLED) display, and the Ubidots platform. The methodology involved device design, sensor calibration, and field testing. Calibration showed sensor accuracy above 90%. Field tests recorded water temperatures of 26.84 °C (tank 1) and 27.74 °C (tank 2), with pH values of 6.73 and 6.87, which did not meet Indonesian national standard (SNI) standards. Data transmission to Ubidots had a 95% packet delivery ratio (PDR) for device 1 and 97% for device 2. The system successfully provided real-time water quality data, supporting effective farm management. However, improvements to the dissolved oxygen sensor and an automatic control system are needed for better stability and efficiency.
Co-Authors Andreas M Simannulang Anggarudin Anggarudin Arie Afriadi Ayi Rahmat Basyaruddin Islmail Harahap Bavitra Bavitra Bavitra, Bavitra Bonardo, Doli Doli Bonardo Doli Bonardo Dwi Eny Djoko Setyono Dwi Eny Djoko Setyono, Dwi Eny Djoko Dwi Rahmaisyah Ferly Oktavia Ferly Oktavia Fortia Magfira Gilang Satria Wahyu Dewantara Harahap, Basyaruddin Ismail Henky Irawan Henry Munandar Manik Hollanda Arief Kusuma Hollanda Arief Kusuma Marisha Pertiwi Marisha Pertiwi Mochamad Adam Maulana Muhammad Zainuddin Lubis Muhammad Zainuddin Lubis Pramana, Rozeff Rozeff Pramana RozeffPramana Rusfa Rusfa Rusfa, Rusfa Simannulang, Andreas M Sri Pujiyati Suhengki Tonny Suhendra Tonny Suhendra