Konstelasi: Konvergensi Teknologi dan Sistem Informasi
Vol. 6 No. 1 (2026): Juni 2026

Optimizing Semantic Clustering of Cultural Heritage Question-Answering Corpora Using Sentence-BERT Embeddings and PCA-Enhanced K-Means

Nala Widyadhana (Universitas Pembangunan Nasional “Veteran” Jawa Timur)
Nur Cahyo Wibowo (Universitas Pembangunan Nasional “Veteran” Jawa Timur)
Tri Lathif Mardi Suryanto (Universitas Pembangunan Nasional “Veteran” Jawa Timur)



Article Info

Publish Date
29 Jun 2026

Abstract

This study examines semantic text clustering using all-MiniLM-L6-v2 sentence embeddings and K-Means on a Dewi Durga question-answering corpus from Indian, Javanese, and Balinese cultural contexts. The dataset contains 1,620 Context-Question-Answer entries extracted from Chapters 1-22. Text preprocessing included structural checking, missing-value inspection, duplicate detection, case folding, non-alphanumeric character removal, and whitespace normalization. Each context was transformed into a 384-dimensional dense embedding vector. The optimal cluster number was evaluated using Auto K across K values from 2 to 10 with Silhouette Score, Davies-Bouldin Index, and Calinski-Harabasz Index, while Manual K = 5 was used as a comparative setting for more detailed thematic interpretation. Six embedding transformation scenarios were tested in both modes. The results show that Auto_K_S5, combining normalization and PCA with 50 components, achieved the strongest internal validation performance with a Silhouette Score of 0.098899, Davies-Bouldin Index of 2.912914, and Calinski-Harabasz Index of 186.476974. Manual_K5_S3 produced more granular themes related to ritual, mythology, history, archaeology, and religious narrative.

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Journal Info

Abbrev

konstelasi

Publisher

Subject

Computer Science & IT

Description

KONSTELASI: Konvergensi Teknologi dan Sistem Informasi invites local and international researchers to publish their papers in Bahasa Indonesia with the following scopes, yet the topics are not limited to: Sistem Informasi Teknik Informatika Industri Teknik Sosial dan Humaniora Pendidikan Ilmu ...