Budi Santoso, Irwan
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STUDENT DEPRESSION SCREENING BASED ON THE OPTIMUM DATA BALANCING AND RANDOM FOREST Adnan, M. Sayyidul; Budi Santoso, Irwan; Crysdian , Cahyo
JURTEKSI (jurnal Teknologi dan Sistem Informasi) Vol. 12 No. 2 (2026): Maret 2026
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat (LPPM) STMIK Royal Kisaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33330/jurteksi.v12i2.4458

Abstract

Abstract: Mental health issues, particularly depression among young adult university students, are often detected late due to stigma and reluctance to seek medical consultation. The objective of this study is to develop an early screening model employing machine learning techniques, specifically the random forest algorithm, on a dataset of 268 students (aged 17-29 years; consisting of 98 males and 170 females) within a multicultural educational setting. The principal challenges associated with this dataset are class imbalance and the potential for data leakage from clinical scores. This study implements a rigorous feature selection approach that involves the elimination of depression score features and the utilization of the Synthetic Minority Over-sampling Technique (SMOTE) to balance the training data distribution. Furthermore, a Threshold Tuning strategy is employed to prioritize detection sensitivity (Recall). The findings indicate that reducing the decision threshold to an optimal value of 0.25 led to a substantial enhancement in the recall value, increasing it from 36% (baseline) to 77%. A feature importance analysis was conducted, the results of which indicated that Total Social Connectedness (ToSC) is the most dominant predictor. In summary, the present study corroborates the notion that optimizing sensitivity through threshold tuning is of paramount importance for medical screening. Furthermore, social isolation factors emerge as more significant indicators of depression risk than demographic attributes. Keywords: data mining; depression; imbalanced data; random forest; smote; threshold tuning Abstrak: Masalah kesehatan mental, khususnya depresi di kalangan mahasiswa dewasa muda, sering terdeteksi terlambat akibat stigma dan enggan mencari konsultasi medis. Tujuan studi ini adalah mengembangkan model skrining dini menggunakan teknik machine learning, khususnya algoritma random forest, pada dataset 268 mahasiswa (usia 17-29 tahun; terdiri dari 98 laki-laki dan 170 perempuan) dalam lingkungan pendidikan multikultural. Tantangan utama yang terkait dengan dataset ini adalah ketidakseimbangan kelas dan potensi kebocoran data dari skor klinis. Studi ini menerapkan pendekatan seleksi fitur yang ketat, yang melibatkan eliminasi fitur skor depresi dan penggunaan Teknik Over-sampling Minoritas Sintetis (SMOTE) untuk menyeimbangkan distribusi data pelatihan. Selain itu, strategi Penyesuaian Ambang Batas diterapkan untuk memprioritaskan sensitivitas deteksi (Recall). Hasil penelitian menunjukkan bahwa mengurangi ambang batas keputusan ke nilai optimal 0,25 menyebabkan peningkatan signifikan dalam nilai recall, dari 36% (dasar) menjadi 77%. Analisis pentingnya fitur dilakukan, hasilnya menunjukkan bahwa Total Social Connectedness (ToSC) adalah prediktor yang paling dominan. Secara ringkas, studi ini membenarkan bahwa mengoptimalkan sensitivitas melalui penyesuaian ambang batas sangat penting untuk skrining medis. Selain itu, faktor isolasi sosial muncul sebagai indikator risiko depresi yang lebih signifikan daripada atribut demografis. Kata kunci: penambangan data; depresi; data tidak seimbang; hutan acak; smote; penyesuaian ambang batas
Differentiated interactive teaching materials based on PowerPoint and HTML5 to improve third-grade students’ mathematical critical thinking skills Budi Santoso, Irwan; Cathrin, Shely
Diniyah: Jurnal Pendidikan Dasar Volume 7 Nomor 1, 2026
Publisher : IAIN Kendari

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31332/dy.v7i1.14435

Abstract

Developing mathematical critical thinking in elementary education requires teaching materials that are interactive, differentiated, and responsive to students’ diverse learning needs. This study aimed to develop differentiated interactive teaching materials based on PowerPoint and HTML5 for third-grade mathematics learning and examine their validity, practicality, and effectiveness. The study employed a research and development design using the ADDIE model. Data were collected through expert validation sheets, teacher and student practicality questionnaires, classroom observation, and mathematical critical thinking tests administered before and after implementation. The product consisted of three differentiated learning pathways, 18 interactive activities, and 45 higher-order thinking questions. The results showed that the product achieved a very valid category with an overall expert validation score of 88.4%. The practicality test also indicated a very practical category, with an average score of 86.4% from teacher and student responses. Students’ mean score increased from 54.6 to 80.4, with 85.7% achieving mastery and an N-Gain of 0.67. These findings indicate that the developed product can support differentiated mathematics learning and promote students’ mathematical critical thinking. Keywords: differentiated teaching materials; elementary mathematics; HTML5; interactive learning media; mathematical critical thinking; PowerPoint