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All Journal Jurnal Informatika Journal of the Indonesian Mathematical Society Jurnal Teknologi Informasi dan Ilmu Komputer Jurnal SIMADA (Sistem Informasi dan Manajemen Basis Data) Jaqfi : Jurnal Aqidah dan Filsafat Islam Science and Technology Indonesia BAREKENG: Jurnal Ilmu Matematika dan Terapan Beta: Jurnal Tadris Matematika JURNAL SILOGISME : Kajian Ilmu Matematika dan Pembelajarannya EIGEN MATHEMATICS JOURNAL Jurnal Matematika UNAND Jurnal Teknologi Informasi dan Multimedia Imajiner: Jurnal Matematika dan Pendidikan Matematika Mandalika Mathematics and Educations Journal Square : Journal of Mathematics and Mathematics Education Contemporary Mathematics and Applications (ConMathA) Majalah Ilmiah Matematika dan Statistika (MIMS) Jurnal Diferensial Jurnal Pepadu Bakti Sekawan : Jurnal Pengabdian Masyarakat Basis : Jurnal Ilmiah Matematika Jurnal Sains Natural Jurnal Pengabdian Masyarakat Sehati Sasambo: Jurnal Abdimas (Journal of Community Service) Sinergi dan Harmoni Masyarakat MIPA JARI : Jurnal Akuakultur Rawa Indonesia
Abdurahim, Abdurahim
Department Of Mathematics, Faculty Of Mathematics And Natural Sciences, Universitas Mataram, Indonesia
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Structural Properties and Reverse Topological Indices of Order GCD Graphs of Integers Modulo Ring Romdhini, Mamika Ujianita; Abdurahim, Abdurahim; Maharani, Andika Ellena Saufika Hakim
Journal of the Indonesian Mathematical Society Vol. 32 No. 2 (2026): JUNE
Publisher : IndoMS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22342/jims.v32i2.2009

Abstract

The order GCD graph of a ring, having the ring elements as the vertex set, and two distinct vertices are adjacent if and only if the greatest common divisor (gcd) of the order of both vertices is equal to the order of the product of these two vertices in the ring. This paper aims to analyze the reverse Sombor, Randić, and Harmonic indices of the order GCD graph where the set of vertices is integers modulo ring elements. The results provide new insights into the mathematical properties of reverse topological indices and their potential applications.
Ensemble Hybrid IndoBERTweet–SVM untuk Analisis Sentimen Twitter terkait Ketidaklolosan Timnas Indonesia di Babak 4 Kualifikasi Piala Dunia 2026 Haryanto, Haryanto; Abdurahim, Abdurahim
Jurnal Informatika Vol 26 No 1 (2026): Jurnal Informatika
Publisher : Institut Informatika Dan Bisnis Darmajaya

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Abstract —  This study aims to develop an Indonesian sentiment analysis system to examine public responses to the elimination of the Indonesian National Team in Round 4 of the 2026 World Cup Qualifiers. The method employed is a quantitative approach utilizing computational experiments based on an IndoBERTweet-SVM hybrid ensemble. The research stages comprise data collection, text preprocessing, feature extraction, model training, performance evaluation, and sentiment analysis on the target data. The tested models include a full SVM, SVM without pragmatic features, SVM without character features, IndoBERTweet transfer learning, and hybrid stacking. The evaluation results reveal that the full SVM yields the best performance with an accuracy of 0.7595 and a macro-F1 score of 0.7573. McNemar's test comparing the hybrid stacking to the best baseline model indicates a statistically significant difference with a p-value of 2.87e-08. The application of the model to 1,000 target data points demonstrates a relatively balanced sentiment distribution: 297 negative tweets (29.7%), 353 neutral tweets (35.3%), and 350 positive tweets (35.0%). These findings suggest that the response to the national team's failure is not entirely dominated by negative sentiments, but also includes evaluative, informative, and supportive elements. The study confirms that the SVM approach based on TF-IDF, character n-grams, and pragmatic features remains highly effective for the sentiment analysis of short Indonesian texts on social media. Furthermore, the developed system has demonstrated end-to-end analytical capabilities and can be further expanded for real-time data processing and broader digital sports studies.   Key word — Sentiment Analysis; Indonesian National Team; Ensemble Hybrid; 2026 World Cup Qualifiers.  
INDEKS WIENER PADA GRAF KOPRIMA PRIMA DARI GRUP BILANGAN BULAT MODULO Abdurahim Abdurahim; LIA FITTA PRATIWI; GUSTI YOGANANDA KARANG; I GEDE ADHITYA WISNU WARDHANA; MAMIKA UJIANITA ROMDHINI
Jurnal Matematika UNAND Vol. 15 No. 2 (2026)
Publisher : Departemen Matematika dan Sains Data FMIPA Universitas Andalas Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jmua.15.2.249-258.2026

Abstract

Graf Koprima Prima merupakan graf yang mana sebarang dua simpul berbeda dikatakan bertetangga jika dan hanya jika Faktor Persekutuan terbesar (FPB) dari order kedua simpul sama dengan 1 atau prima. Penelitian ini bertujuan untuk mengkaji subgraf serta rumus umum dari indeks Wiener dan Hyper-Wiener pada graf koprima prima dari grup bilangan bulat. Dari penelitian ini didapatkan bahwa subgraf yang terbentuk adalah graf lengkap dan bipartit. Selain itu, diperoleh juga rumus umum indeks Wiener dan Hyper-Wiener. Lebih jauh, nilai dari indeks Hyper-Wiener kurang dari dua kali indeks Wiener.
Co-Authors Adam Bachtiar Maulachela Agus Kurnia Agus Rahardi, Agus Al-Sharqi, Faisal Ambar, Jinan Asmaul Husna RS Awanis, Zatta Yumni Ayes Malona Siboro Baihaqi, Muhamad Adzib Biyas Ola Tafakkur Chern, Jann-Long Choirunnisa, Fajarani Dian Syafitri Chani Saputri Fadhilah, Rifdah Faiqotul Mala Fariz Maulana Farwan Farwan Farwan, Farwan Fathul Maulina Wahidah Gayatri, Marena Rahayu Ghoffari, Lalu Hasan Graha, Syifa Salsabila Satya Gusti Ayu Made Arna Putri Gusti Yogananda Karang Gusti Yogananda Karang Harsyiah, Lisa Haryanto Haryanto Hendriana, Andri Hernawan, Systa Ambar Wangi Hidayat, Malik Hidayatullah, Azka Farris I Gede Adhitya Wisnu Wardhana I Gede Adhitya Wisnu Wardhana Irwansyah Irwansyah Irwansyah Irwansyah Iskandar, Andri Isnaini Rosyida, Isnaini Karang, Gusti Yogananda Kusuma, Shendy Arya Lailia Awalushaumi Lailia Awalushaumi, Lailia Lalu Puji Indra Kharisma Lalu Riski Wirendra Putra Lestari, Sahin Two Lia Fitta Pratiwi Lia Fitta Pratiwi Maharani, Andika Ellena Saufika Hakim Mamika Ujianita Romdhini Marwan Marwan Maulana, Fariz Meiliza Muhammad Rijal Alfian MUHAMMAD TAJUDDIN Nurjoko Permata, Reny Amalia Pradana, Satriawan Pratama, Rendi Bahtiar Pratiwi, Lia Fitta Putra, Lalu Riski Wirendra Putri, Syaftirridho Qudsi, Jihadil Qurratul Aini Ramadhan, Hikmal Maulana Ramadhani, Dian Eka Rendi Bahtiar Pratama Reny Amalia Permata Rezky Ramdhaningsih Rio Satriyantara Rizal, Ahmad Ashril Robbaniyyah, Nuzla Af'idatur Robbaniyyah, Nuzla Af’idatur Rodzi, Zahari Md. Roushandy Asri Sahidin, Amir Salwa Salwa Satriawan Pradana Satriawan, Didit Satryantara, Rio Siboro, Ayes Malona Siti Muawanah Siti Raudhatul Kamali Sri Rahmawati Syafitri, Hanna Syaftirridho Putri Syaharuddin Syahroni Hidayat Syaidatussalihah Syaidatussalihah Syamsul Bahri Syechah, Bulqis Nabula Syifa Salsabila Satya Graha Tri Maryono Rusadi Veithzal Rivai Zainal Wahidah, Fathul Maulina Wahyudi, Imam Tri Wardana, I Gede Adhitya Wisnu Wardhana, I Gede Adhiya Wisnu Yumni Awanis, Zata Zata Yumni Awanis Zata Yumni Awanis Zikri, Lalu Muhammad Faiz Zulhan Widya Baskara