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Gunawan Wibisono
Universitas Teknologi Yogyakarta
Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Dentistry Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Nursing Physics Public Health Social Sciences Transportation Other

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Beton Geopopolimer Hibrid Abu Terbang untuk Kolam Penampungan Limbah Cair Kelapa Sawit Aqilla, Azzahra; Khoiri, Salsabilla Rahmadia; Arrasyid, Taufik Hatta; Irsyad, Muhamad; Delthayanti, Annesya Fabyola; Wibisono, Gunawan; Olivia, Monita
Jurnal Teknik Sipil Terapan Vol. 7 No. 3 (2025): E-ISSN 2714-7843
Publisher : Jurnal Teknik Sipil Terapan (JTST)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47600/jtst.v7i3.1226

Abstract

 Palm Oil Mill Effluent (POME) is an agro-industrial waste characterized by a low pH and high concentrations of organic pollutants, including COD and BOD, making it hazardous to the environment if untreated. This study investigates the application of fly ash-based self-healing hibrid geopolymer concrete as a sustainable material for POME stabilization ponds. The concrete mix included fly ash (75%), PCC (15%), 10% silica fume, NaOH solutions of 10M and 14M, and silicate modulus ratios of 2.5 and 3. Cylindrical concrete specimens measuring 150x210 mm were immersed in POME for 7, 14, and 28 days. Tests included compressive strength, porosity, UPV, and visual inspections. Results revealed that concrete with 14M NaOH, a silicate modulus of 3, and 10% silica fume exhibited optimal compressive strength (12.5 MPa), low porosity (9.2%), and high durability after 28 days of immersion. These findings suggest that hibrid geopolymer concrete can serve as an environmentally friendly alternative to conventional pond linings, enhancing resistance to the aggressive chemical environment of POME. Further research is recommended to explore long-term performance and field applications of this material. Keywords: Geopolymer, Palm Oil Mill Effluent, Silica Fume, Stabilization Pond        
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.
Evaluation Of the Legality and Requirements of Starlink in Indonesia Using a Regulatory Impact Analysis Approach Ficco Clivano Ikhsan; Gunawan Wibisono
International Journal of Electrical, Computer, and Biomedical Engineering Vol. 4 No. 1 (2026)
Publisher : Universitas Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62146/ijecbe.v4i1.210

Abstract

Indonesia has a territory and large population. Indonesia is one of the largest countries in the world, with an internet penetration rate of around 79% of the total population as of 2024. This has prompted Indonesia to improve its network and other telecommunications-related issues. This study evaluates the feasibility of utilizing Starlink satellites to equalize telecommunications access in Indonesia. Based on Law No. 36 of 1999 concerning Telecommunications, which mandates the provision of services to all regions, this study aims to evaluate the role of Starlink while identifying legal and regulatory obstacles related to this new technology. It also analyzes the legality of this technology and explains the sovereignty issues raised by Starlink. By applying the Regulatory Impact Analysis method, which uses the main stages of problem definition, policy identification, impact and policy evaluation, stakeholder consultation, and selection of alternative policies through interviews and framework. It began with the first option, which was a policy where the government permanently revokes Starlink's operational licenses to prioritize national sovereignty and data security. Option 2 approaches the issue with a temporary suspension and a comprehensive technical audit of the Network Operation Center (NOC) and Lawful Interception capabilities, and option 3 focuses more on giving Starlink more time to fully comply with regulations. Option 2 is the best choice because of its highest PMI score and its ability to balance the interests of regulators, operators, and the public. However, it temporarily disrupts service access for potential users, particularly in remote regions.
Design and Experimental Validation of an SDR-Based Private LTE Network for Flood Monitoring Bambang Candra Wibawa; Gunawan Wibisono
International Journal of Electrical, Computer, and Biomedical Engineering Vol. 4 No. 1 (2026)
Publisher : Universitas Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62146/ijecbe.v4i1.213

Abstract

The widespread impact of hydrometeorological disasters, such as floods, necessitated a reliable and rapidly deployable communication infrastructure to support real-time monitoring and early warning systems. During such events, conventional public cellular networks frequently collapsed, hindering critical information exchange. To address this vulnerability, the study presented the design and performance validation of a private LTE network based on software-defined radio SDR USRP B210 and open-source software, intended as a resilient backbone for an IoT-based flood monitoring system. The system was tested to assess its signal quality and user experience metrics across varying radial distances. Signal analysis confirmed severe channel degradation, with the SINR dropping from the “Excellent” category at 3 m to the “Fair” and “Poor” category at 9 m. This SINR decline directly caused the downlink throughput to fall drastically from 27 Mbps to a low of 2.8 Mbps and significantly inflated the maximum latency to 87 ms due to frequent HARQ retransmissions. Despite these constraints, the network supported low-bandwidth IoT RSRP logging for modem consistency verification and sustained high-demand services including real-time data communication and voice and video calls. Overall, the results validated the system’s ability to establish resilient and self-sustained connectivity to support disaster mitigation and response operations.
Co-Authors Abdul Aziz Achmad B. Fathoni Adriansyah, Bagas Afifah, Nisaul Aflakh Wijayanto, Naufal Agus Ika Putra Agus Rakhmadi Mido Agus S. Tamsir Alfani, Nezar Febri Alfian Malik Alon Jala Tirta Segara Ananda, Yazid Fahmi Andrian, Jumigih Anggi Zafia Anjar Taufik Hidayat Anugrah, Ihsanul Arkan Aqilla, Azzahra Ari Sandhyavitri Arief Hermawan Arif Amrulloh Ariffin Ariffin Arifin Arifin Arisky Arisonya, Susanti Armando, Richo Arrasyid, Taufik Hatta Asta, Melsa Sentia Azizi, Wildan Bambang Candra Wibawa Boedi, Rizky M. Cahya Anggarakasih, Sabitya Candra Bamel Chafizh Hisbulloh, Dika Chusaeni, Amana F. Copricon, Deby Elfi Damayanti, Elok Daniel Simanjuntak, Daniel Darmawati Ayu Indraswari Delthayanti, Annesya Fabyola Dewi Ayu Lestari Dikpride Despa EIH Ujianto Elianora - Endang Sri Lestari Erik Iman Heri Ujianto Ermiyati Fadhlurrahman, Fadhlurrahman fakhri Fakhri, Fakhri Fata Allamsyah, M. Zahwa Fatonah, Uci Fauzi, Muhamad Rifki Febridiani, Lintang Dwi Ferdi Ferdi, Ferdi Fernandes, Sandhy Ferry Fatnanta Ficco Clivano Ikhsan Fikra Titan Syifa Firman Maulana, Firman Fitri, Aidi Yani Fitriati Ghaly Al Ghifari, Muh. Naufal Gilang Herawan, Muhamad Grahita Aditya Gussyafri Haifan, Naufal Hargo Utomo Haripin, Haripin Herry Susanto Hibatullah, Irfan Hidayat, Muhammad Hisbi Maulana, Muhammad I Ketut Budiasa Ikhram, Faisal Ikmah, Maghfiroh Nur Ikrammullah, Muhammad Imam Suprayogi Iman, Aphitz Maulana Indraprakoso, Dondy Irsyad, Muhamad Iskandar Iskandar Jamili, M Joehari Jufri, Afdirman Juliasman, Rendy Dwi Khoiri, Salsabilla Rahmadia Kurniasari, Marisa Wahyu Kurniawan, Taufiq Alif Kurniawati, Marhaeni Fajar Laksni Sedyowati Leo Sentosa Lubis, Shakila Fuadah Luthfwiedy Pratama, Dhiyaa M. Dian Rioputra M. Haikal Ramadhan Mas Aly Afandi Maulana, Zikri Maulidi, M Aldi Monita Olivia Muhamad Yusa Muhammad Arif Muhammad Ikhsan Muhammad Zainal Abidin Muhardi Muhardi Muhardi Muliyono Mulyono, Eliana Sachi Muria, Irfan Napitupulu, Heri Negara, Made Dwipa Novan, Andre Nugraha, Surya Nugroho, Kukuh Nurdin Nurdin Nurdin Nurhalisa, Siti Oktariyansa, Randy Oktaviana, Lutvi Tri Perani Rosyani Prabowo, Yoghi Bagus Priska Apnitami Purnomo S. Priambodo Puspandari, Silviana Ayu Puspitasari, Lisa Puspitasari, Tasia Rizky Putra, Gia Nugraha Putri, Addin Kurnia Putri, Diariza Dwi Qosidah, Nanik Rahmana, Fhadil Yulisesha Randhi Saily Ria Larici, Ria Riska Fitriani S. Thya Safitri, S. Thya Safridatul Audah Sakahuni, Sakahuni Satibi, Syawal Septari, Dinda Setyawan, Rachmat Setyawan, Reza Sevia Indah Purnama Sigit Pramono Skripsa, Tira H. Skripsa, Tira Hamdillah Slamet Indriyanto Soewignjo Agus Nugroho Solikhul Amin, Muhammad Sri Djuniati Sri Juniati Sufriady Syam Sukoco, Muhammad Helmi Susanto, Herry Syauqi Habibillah, Ade Taufiq A. Kurniawan Teguh Firmansyah Toni, Afriwan Tornando, Hengki Tri Waluyo Trihastuti Yuniati Ujianto, EIH Ulumuddin, Muhammad Ageng Usman, Muhammad Lulu Latif Wijoyo, Agung Wirayuda, Ricky Purnama Yenita Morena Yofani, Dhea Fitra Yoga Dwi, Farhan Yuda Permadi, Yuda Yulian Zetta Maulana Z, Harist Febrie R