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Clustering Prestasi Akademik Lulusan Menggunakan Metode K-Means Ishak, Rezqiwati; Bengnga, Amiruddin
Jambura Journal of Electrical and Electronics Engineering Vol 6, No 1 (2024): Januari-Juni 2024
Publisher : Electrical Engineering Department Faculty of Engineering State University of Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/jjeee.v6i1.23967

Abstract

Prestasi akademik merupakan salah satu indikator penting untuk mengukur keberhasilan seorang mahasiswa dalam menyelesaikan studinya di perguruan tinggi. Prestasi ini dapat dilihat dari berbagai aspek, seperti lama studi dan Indeks Prestasi Kumulatif (IPK). Analisis ini digunakan untuk meningkatkan kualitas Pendidikan pada Perguruan Tinggi itu sendiri, serta untuk membantu Mahasiswa dalam mencapai prestasi yang optimal. Penelitian ini bertujuan untuk melakukan clustering prestasi akademik lulusan pada Universitas Ichsan Gorontalo untuk Tahun Akademik 2023/2024 semester Ganjil dengan menerapkan metode K-Means. Jumlah dataset lulusan yang digunakan sebanyak 240 data. Analisis clustering dilakukan berdasarkan atribut lama studi, umur, dan Indeks Prestasi Kumulatif (IPK). Hasil penelitian ini menunjukkan adanya 3 (tiga) cluster utama. Cluster 1 (satu) merupakan kelompok lulusan dengan prestasi akademik cukup baik, terdiri dari 56 lulusan. Cluster 2 (dua) menggambarkan kelompok lulusan dengan prestasi akademik sangat baik, terdiri dari 138 lulusan. Sementara itu, Cluster 3 (tiga) menunjukkan kelompok lulusan dengan prestasi akademik kurang baik jika dilihat dari lama studi, terdiri dari 45 lulusan. Pemilihan jumlah cluster sebanyak 3 didasarkan pada hasil perhitungan teknik Elbow dan evaluasi Davies-Bouldin Index yang memberikan nilai terkecil yakni  0,79 sehingga hasil clustering masuk kategori baik karena nilai DBInya di bawah 1.Academic achievement is one of the important indicators to measure a student's success in completing their studies at the university. This achievement can be observed from various aspects, such as the duration of study and the Cumulative Grade Point Average (GPA). This analysis is used to improve the quality of education at the university itself and to assist students in achieving optimal performance. This research aims to cluster the academic achievements of graduates at Ichsan Gorontalo University for the Academic Year 2023/2024 Odd Semester using the K-Means method. The number of graduate datasets used is 240. The clustering analysis is based on attributes such as the duration of study, age, and Cumulative Grade Point Average (GPA). The results of this study indicate the existence of 3 main clusters. Cluster 1 represents graduates with fairly good academic achievements, consisting of 56 graduates. Cluster 2 describes a group of graduates with excellent academic achievements, totaling 138 graduates. Meanwhile, Cluster 3 indicates a group of graduates with less satisfactory academic achievements when considering the duration of study, consisting of 45 graduates. The selection of 3 clusters is based on the results of the Elbow technique calculation and the evaluation of the Davies-Bouldin Index, which gives the smallest value of 0.79. Therefore, the clustering results are considered good because the DBI value is below 1.
Optimization of K-Means in Disease Clustering of Pregnant Women Using Random Forest Ishak, Rezqiwati; Nurmawanti, Nurmawanti; Bengnga, Amiruddin
Jambura Journal of Electrical and Electronics Engineering Vol 7, No 1 (2025): Januari - Juni 2025
Publisher : Electrical Engineering Department Faculty of Engineering State University of Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/jjeee.v7i1.28374

Abstract

Pregnant women's health is an important aspect of the public health system, where grouping disease data can help in risk identification and better treatment planning. However, traditional clustering methods such as K-Means often face challenges in optimal separation between clusters, especially when the attributes used are irrelevant. This study aims to optimize the K-Means method in disease clustering in pregnant women by applying Random Forest-based attribute selection. Of the six available attributes (age, weight, height, gestational age, systole, and diastole), the three main attributes namely systole, diastole, and gestational age were selected based on the Importance Score from Random Forest. The test results showed that the use of these three attributes increased the Silhouette Score by 0.21 (from 0.23 to 0.44), indicating better cluster separation, and lowered the Davies-Bouldin Index by 0.69 (from 1.50 to 0.81), indicating a more compact and well-separated cluster. Clustering visualization using Principal Component Analysis (PCA) supports these results. In addition, the calculation of the Elbow method shows the optimal number of clusters at k=3, reinforcing the conclusion that the selection of the right attributes and the number of clusters improves the quality of clustering. Overall, this study proves that the selection of Random Forest-based features is able to optimize the K-Means method in disease clustering in pregnant women, which is expected to improve the effectiveness of diagnosis and treatment planning.Kesehatan ibu hamil merupakan aspek penting dalam sistem kesehatan masyarakat, di mana pengelompokan data penyakit dapat membantu dalam identifikasi risiko dan perencanaan perawatan yang lebih baik. Namun, metode clustering tradisional seperti K-Means sering kali menghadapi tantangan dalam pemisahan yang optimal antar cluster, terutama ketika atribut yang digunakan tidak relevan. Penelitian ini bertujuan untuk mengoptimalkan metode K-Means dalam clustering penyakit pada ibu hamil dengan menerapkan seleksi atribut berbasis Random Forest. Dari enam atribut yang tersedia (usia, berat badan, tinggi badan, usia kehamilan, sistole, dan diastole), tiga atribut utama yaitu sistole, diastole, dan usia kehamilan dipilih berdasarkan Importance Score dari Random Forest. Hasil pengujian menunjukkan bahwa penggunaan tiga atribut ini meningkatkan Silhouette Score sebesar 0,21 (dari 0,23 menjadi 0,44), yang mengindikasikan pemisahan cluster yang lebih baik, serta menurunkan Davies-Bouldin Index sebesar 0,69 (dari 1,50 menjadi 0,81), menunjukkan cluster yang lebih kompak dan terpisah dengan baik. Visualisasi clustering menggunakan Principal Component Analysis (PCA) mendukung hasil ini. Selain itu, perhitungan metode Elbow menunjukkan jumlah cluster optimal pada k=3, memperkuat kesimpulan bahwa pemilihan atribut dan jumlah cluster yang tepat meningkatkan kualitas clustering. Secara keseluruhan, penelitian ini membuktikan bahwa seleksi fitur berbasis Random Forest mampu mengoptimalkan metode K-Means dalam clustering penyakit pada ibu hamil, yang diharapkan dapat meningkatkan efektivitas diagnosis dan perencanaan perawatan.
Optimizing of IndoBERT Embedding with Ditto Whitening for Measuring Research Title Similarity Rezqiwati Ishak; Amiruddin Bengnga
Jambura Journal of Electrical and Electronics Engineering Vol 8, No 1 (2026): Januari - Juni 2026
Publisher : Electrical Engineering Department Faculty of Engineering State University of Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/jjeee.v8i1.35554

Abstract

Measuring the semantic similarity of research titles is a crucial component in maintaining academic originality and preventing topic duplication in higher education. However, IndoBERT embeddings, as a pretrained Indonesian language model, are known to suffer from anisotropy, causing many titles to exhibit high similarity scores despite being semantically distinct. This study aims to optimize the quality of IndoBERT embeddings through Ditto Whitening and to evaluate its impact on research title similarity measurement. The dataset comprises 7.785 undergraduate thesis titles collected from six disciplinary domains and processed using mean pooling and L2 normalization before and after whitening. An intrinsic evaluation was conducted by assessing embedding isotropy, cosine similarity distribution, global bias toward the mean vector, and hubness phenomena, supported by embedding space visualizations using t-SNE, UMAP, and cosine similarity heatmaps. Experimental results demonstrate substantial improvements in embedding quality, indicated by a reduction in Cosine Pair Mean from 0.559 to −0.000145, a decrease in MeanCos-to-Mean from 0.748 to 0.0068, and a reduction in Hubness Skew from 1.60 to 0.68. The isotropy of the embeddings also increased markedly, reflecting a more uniform vector distribution. These findings confirm that Ditto Whitening effectively improves the isotropy of IndoBERT embeddings and directly enhances the accuracy of research title similarity detection and academic document retrieval systems, thereby supporting topic management and research quality assurance in higher education.
Aspect-Based Sentiment Analysis (ABSA) of Ventela Shoe Reviews on TikTok Shop Using Fine-Tuned IndoBERT Fitrawansyah Butas; Amiruddin Bengnga; Maryam Hasan; Rezqiwati Ishak; Rofiq Harun; Andi Kamaruddin
Jambura Journal of Electrical and Electronics Engineering Vol 8, No 2 (2026): Juli - Desember 2026
Publisher : Electrical Engineering Department Faculty of Engineering State University of Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/jjeee.v8i2.39805

Abstract

The massive volume of consumer reviews on the social commerce platform TikTok Shop makes it difficult for local shoe brands such as Ventela to understand consumer perception in a structured manner, while Indonesian-language Aspect-Based Sentiment Analysis (ABSA) studies on this platform remain very limited. This study aims to apply fine-tuned IndoBERT for aspect-based sentiment classification and to measure consumer perception of four product aspects, namely Comfort, Design, Durability, and Price. Using a computational experiment approach, 1,000 reviews were collected, automatically annotated using a lexicon-based method with negation handling, restructured into 706 review-aspect pairs and divided using an 80:20 stratified split, and used to train and compare three models: TF-IDF with Logistic Regression, TF-IDF with Linear SVM, and fine-tuned IndoBERT. Testing on 142 test samples shows that fine-tuned IndoBERT is superior, achieving an Accuracy of 0.8521 and an F1-Macro of 0.7813 and surpassing both baselines on four of five primary metrics. Analysis of 706 review-aspect pairs identifies Design (75.6% positive) and Price (71.8% positive) as the main strengths, while Comfort (32.7% negative) and Durability (30.8% negative) emerge as improvement areas related to sizing and the quality of adhesive and stitching. This study enriches Indonesian ABSA literature in the social commerce domain and delivers a ready-to-use web-based simulator built with Gradio to facilitate periodic consumer-perception monitoring for data-driven decision-making processes.