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Hybrid Relevance and Sentiment Classification of Indonesian Gold Tweets Using Machine Learning for Market Risk Signal Extraction Kamalia, Antika Zahrotul; Indra, Indra; Wibowo, Arief; Riwurohi, Jan Everhard; Hassan, Shiza
International Journal of Advances in Data and Information Systems Vol. 7 No. 1 (2026): April 2026 - International Journal of Advances in Data and Information Systems
Publisher : Indonesian Scientific Journal

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59395/ijadis.v7i1.1517

Abstract

This study proposes a hybrid relevance–sentiment classification framework to analyze public opinion on physical Antam gold from Indonesian Twitter data and to support exploratory market-risk signal extraction. Tweets were collected during February–November 2025, after preprocessing and text-normalized deduplication, 1,271 unique tweets were retained. The approach combines weak supervision (rule-/lexicon-based silver labels) with TF-IDF-based machine learning in two stages: (1) relevance classification to separate tweets genuinely discussing physical Antam gold from non-relevant contexts (e.g., ANTM stock/capital-market discussions), and (2) two-class sentiment classification (positive vs negative) applied to relevance-filtered tweets. Random Forest achieved the strongest relevance performance (Accuracy = 0.984; macro-F1 = 0.943; 5-fold CV macro-F1 = 0.928 ± 0.033). For sentiment classification, performance was moderate and close across models; the most stable model under cross-validation (Logistic Regression/Naive Bayes) was used for downstream aggregation. Sentiment outputs were aggregated into a monthly sentiment index for descriptive comparison with gold prices; the observed association was weak, indicating that the index is better interpreted as a risk-perception proxy rather than a direct price predictor.
Peningkatan Literasi Teknologi Rotary Kiln Electric Furnace dalam Mendukung Industri Nikel Sulawesi Tenggara Irwan Syahib, Muhammad; Idris Putra , Muhammad; Indra, Indra; Setiawan , Adhi; Yuliana, Anita; Hadistio , Ryan Rinaldi; Putra Singarimbun , Aldo Putra; . Rahman , Muhammad Iqbal A. A; Rahman, La
Anoa : Jurnal Pengabdian Masyarakat Fakultas Teknik Vol 4 No 02 (2025): Edisi Desember Tahun 2025 Anoa : Jurnal Pengabdian Masyarakat Fakultas Teknik
Publisher : FAKULTAS TEKNIK UMKENDARI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51454/anoa.v4i02.1573

Abstract

Southeast Sulawesi is one of the largest nickel-producing centers in Indonesia, marked by the booming development of nickel processing industries (smelters) utilizing the Rotary Kiln Electric Furnace technology. This technology serves as the backbone of lateritic nickel refinement. However, access for Mechanical Engineering students to Rotary Kiln Electric Furnace technology for internship and research purposes is very limited, creating a gap between the academic curriculum and industry needs. This community service activity aims to bridge this gap through a scientific seminar that introduces the Rotary Kiln Electric Furnace working principles, key components relevant to Mechanical Engineering, and the available job descriptions in smelters. The implementation method includes interactive material delivery and in-depth discussions. The results of the activity show an increase in students' understanding of the Rotary Kiln Electric Furnace nickel processing cycle and the identification of the crucial role of Mechanical Engineering in the operation and maintenance of the Rotary Kiln, electric furnace, and supporting utility systems. The benefit gained is that students are equipped with foundational knowledge of Southeast Sulawesi's leading nickel technology, enhancing their readiness to compete in the job market within the smelter industry.
Co-Authors . Rahman , Muhammad Iqbal A. A Aam Slamet Rusydiana, Aam Slamet Abdul Mughni Afdhal Fuadi Afifah, Kuni Afriliani, Sri Afrina, Nyak Yusfa Agus Nugroho, Agus Agus Umar Hamdani Agussabti Agussabti Agustina, Adinda Agustinawati, Dwi Agustini, Sherly Ahmad Rosyid Akbardiansyah, Akbardiansyah Aksal Hidayat Al Aziz, Abdul Al Rasyidin Alexius Ulan Bani Alfiyanti, Dwi Ali, Ramsah Ali, Zulkarnain Muhammad AMALIA, TIARA Ambiyar, Ambiyar Anak Agung Istri Sri Wiadnyani Andi Bungawati, Andi Andi Rosman N Andrilolo, Andrilolo Andy Arya Maulana Wijaya Anita Priantina Annissya, Widia Primi Antika Zahrotul Kamalia Aprillia, Ade Yeni Ardhina, Aried Ardiansyah, La Ode Ariani Trisna Murti Arief Wibowo Arifin, Dadang Arifin, Nofri Yudi Arip Rahman Arsad, Arsad Aryasanti, Agnes Asia Arifin asih, yekti purwo Athaya, Putri Aufa, Aufa Aulia Puspa Ayu Aulia Rahman Auliansyah, Auliansyah Avedta, Sherrindra Azzahro, Siti Fatimah Basir, Ita Sulistiani Bayu Prasetyo, Bayu Bayu Taufiq Possumah, Bayu Taufiq Bernadus Gunawan Sudarsono Bravo, Bram Darfiti, Refit Gustaroska Darmawan Darmawan Dayat Dayat, Dayat Depari, Genesis Sembiring Dewi Kusuma Wardani Dewi, Trihoni Nalesti Dewi, Yasdiafiani Dhanny Cahyadi, Dhanny Diah Supatmiwati Didit Haryadi Efendi, Raimon Efin Shu Eka, Audinah Elly Susanti Elvi Juliansyah Endang Silaningsih Ernawati Ernawati Erni Yuningsih Ervien Ervien, Ervien Erwin Purwanto Faizi, Besse Nur FAJAR SETIAWAN Fajar Setiawan Falihin, Dalilul Farida Arianti Fatimah, Tri Fatiqiyah, S. Syarah Firdausi, Wildan Firmansyah Firmansyah Firnanda, Teguh Fissilmi, Annisa Fitri Wijayanti Fitriya, Fitriya Gamayuni, Rindu Rika Gatut Ari Wardani Grace Gata, Grace Gustaman, Firman Gusti Vonna, Adinda Habiba, Syahrir Hadidtyo Wisnu Wardani Hadistio , Ryan Rinaldi Haedar Haedar, Haedar Halimursyadah Halimursyadah Hamdan Hamdan Hamidi Hamidi Handepi, Nogi Hasmina Tari Mokui Hasni, Mutiara Hassan, Shiza Hendra Purnama Hilda Hastuti Hilda Susanti Hudiarto Hudiarto, Hudiarto Husen, Rahma Aulia Hussin, Mohd Fauzi bin Abu Ibarahim, Deva Idacahyati, Keni Idriana, Idriana Idris Putra , Muhammad Ihsan, Fahrun Ilahi, Vitratul Imaduddin, Imaduddin Indra Indra Indrawan, Mohamad Gita Indya Dewi Insani, Risna Nurul Insani, Sri Ayu Intan Indriani , Gustania Iqram, Muh. Irwan Syahib, Muhammad Iskak, Jamaludin Isnaini, Nadia Jati, Sri Nugroho Jauharlina Jauharlina Joko Purnomo Julyanti, Ai Rian Jumardi Budiman Kada, Marselino Sambo Kamal, Kamal Kamarubayana, Legowo Kamaruzzaman, Suraiya Karimah, Diva Azka Khairun Nisa Khaq, Akhsanul Khoe Yao Tung Kirana, Hashimia Nindya Kur’ani, Nur Kurniaty, Dwi Kurniawan D, Erno Kurniawan, Pebri Kusdiarto, Djati La Taena, La Lilis, Tuslinah Lis Suryadi, Lis Lucy Warsindah Luqyan Tamanni, Luqyan Lusi Nurdianti, Lusi Maharani, Wahyuni Diandra Martono Martono Maryadi Maryadi Maryadi Masyitha Wahid Meti Kusmiati, Meti Mia Sari, Mia Miftahul Huda Moh. Nisyar Sy. Abd. Azis MUFTI MUFTI, MUFTI Muh Nur Syukriani Yusuf Muh. Darwis Muhammad Akram Muhammad Ferdiansyah, Muhammad Muhammad Ilham Muhammad Thahir Muhammad Yusuf Ibrahim Muhammdar, Muhammadar Mujiburrahmad Mujiburrahmad Mukarom, Hasna Maulani Mukhram, Muhammad Muliati Muliati, Muliati Murdani, Agus Murdia, Agus Miranda Murni Murni Murti Suyoto, Indah Dewi Mustarum Musaruddin Mutia Alif Cahyani Nadrun, Nadrun Najmi Najmi, Najmi Naniwarsih, Andi Nashr Akbar, Nashr Nasrun, Muhammad Syaifuddin Nasution, Nurwinda Aulia Nawawi Nawawi Nazarudin Nelly Shofia Netania Emilisa Nizwardi Jalinus Novianti, Asri Dwi Novita Anggraeni Nur Afni Nur Rahayuningsih, Nur Nur, Nahya Nuralamsah Zulkarnaim Nuriman, Nurfitriavi Nurmalasari, Novianti Nurmuliayanti Muis Nurul Akmal, Intan NURUL HIDAYAH Nurul Inayah Nurunnasikin, Nurunnasikin Nurwati Nurwati Oki Maulana Oktasya, Khairina Mutia Oman Sukmana Oslan Jumadi Pamuncak, Mohammad Bintang Parman, Imelda Aulia Prajaputra, Vicky Pramono, Sigid Eko Pratiwi, Asty Eka Putra Singarimbun , Aldo Putra Putri, Isra Mulia Putri, Nabila Putri, Tiara Resta Qorina, Erik Inazi Rabiatul Adawiyah Rachmad, Dedy Rafiqa, Syarifa Rahmah, Aziza Rahman, La Rahmandhita, Awaluna Nurdilan Rajab, Vira Ardianti Ramadan Ramadan Ramadhan Sitepu, Yuda Mulia Ramdani, Muhamad Rizki Ratih Agustin Wulandari Ratnasari Ratnasari Rian Adrian Riki Gana Suyatna Riski, Cantika D. Risno, Risno Riswandha, Muhammad Noval Rizaldi, Agung Rizki, Akang Abdika Robin Robin, Robin Rosul, Mekar Bunga Allamanda Ruwirohi, Jan Everhard Saddam, Mohd Amiruddin Sahputra, Roza Salamatun Umma Samsinar Samsinar Sartika Sartika Sartika, Sartika Saskia, Saskia Satifa, Siti Annisa Satria, Akbar Dimas Septiani, Elsa Trista Setiawan , Adhi Setiawan, Kurnia Sihotang, Putri Siti Rahma Sawalia Nabila Sobari, M. Abdul Azis Sofyan Sofyan Sopian Sinaga Suci, Syahra Deviena Khien Sufriadi, Elly Sukendi, Agis Maulana Sukiman Sukiman Sukmana, M. Laily Qadry Sulasti, Sulasti - Sulindrina, Andra Sulistia, Yunika Sumarno . Supomo Supomo Suri, Ghea Paulina SUSENO, JOKO Sutarman Sutarman Sutrisna, Saleh Suyanti Kasimin Syahputra Nasution, Kurnia Syaiful Bachri Syaifullah Muhammad Syaipudin, Usep Syamsidah, Syamsidah Syamsurrijal Syarifah Balkis Syukri Iska, Syukri Tarmizi , Erwandi Taufieq, Nur Anny S. Thaha, Sarma Theresa Dwi Kurnia Tirkaamiana, Muhammad Taufan Tri Bowo Atmojo, Tri Bowo Triyani, Anggi Triyono, Gandung Udin Rinaldi Usana, Usana Usman Usman Usman, Auliah Wa Ode Rahmadania Wahyudi , Wahyudi Warnida, Husnul Waskito Waskito, Waskito Wedi, Surya Wibisono, Chabulullah Wibowo, Daniel Budi Wibowo, Herry Widyaningsih, Atria Tiffany Wiharto, Yudi Winda Trisna Wulandari, Winda Trisna Wirman, Wirman Wisandra, Ade Yadi Aditya, Prawira Yanti, Arifatul Yesi Aprianti Yuana yuana, Yuana Yudhi Ahmad Nazari Yudi Santoso, Yudi Yulia, Yulfa Yuliana, Anita Yusuf, Nur Ayun R. Zaerofi, Afif Zahirah, Zahirah Zairin, Zairin Zikri, Irfan ZUHRONI, ZUHRONI Zulfadli, Muhammad zulkifli, ridwan Zulwanis, Zulwanis