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All Journal Semantik Techno.Com: Jurnal Teknologi Informasi Jurnal Ilmiah Teknik Elektro Komputer dan Informatika (JITEKI) Sinergi Jurnal Transformatika INTECOMS: Journal of Information Technology and Computer Science Delta: Jurnal Ilmiah Pendidikan Matematika Jurnal CULTURE (Culture, Language, and Literature Review) Journal of Computing Theories and Applications
Jutono Gondohanindijo
AKI University
Humanities Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Education Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Mathematics Other

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Analisis Akurasi dan Waktu Proses Deteksi Sentimen Menggunakan Image Mel-Spectrogram Gondohanindijo, Jutono
Techno.Com Vol. 24 No. 3 (2025): Agustus 2025
Publisher : LPPM Universitas Dian Nuswantoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62411/tc.v24i3.13906

Abstract

Dalam upaya meningkatkan interaksi manusia-mesin, penelitian deteksi sentimen sudah banyak dilakukan peneliti untuk tujuan tersebut. Seiring dengan berkembangnya Mesin Pembelajaran, penelitian ini akan membandingkan kemampuan empat model klasifikasi : CNN, CRNN, SVM, dan MLP—dalam mengidentifikasi sentimen berbasis gambar Mel-spectrogram. Penelitian ini memanfaatkan representasi Mel-Spectrogram dari 640 sampel image ( gambar ) spektrogram yang mencakup delapan kelompok kelas sentimen berbeda. Setelah melalui tahap praproses data gambar dan ekstraksi fitur, kinerja model dievaluasi menggunakan validasi silang 10-fold serta metrik akurasi, presisi, recall, dan F1-score. CNN dan CRNN mencapai akurasi tertinggi (100%), sedangkan SVM dan MLP mencapai 99,22%. Dari sisi waktu pelatihan, SVM membutuhkan waktu paking sedikit, yaitu sebesar 0,45 detik. Penelitian ini bertujuan untuk mengetahui efektivitas pendekatan image (gambar) Mel-Spectrogram dan menegaskan perlunya pertimbangan trade-off antara akurasi tinggi dan efisiensi komputasi dalam pemilihan model. Kata Kunci – Analisis, Mel-Spectogram, Sentimen, Waktu Proses
A Comparative Study of Embedding Techniques and Classifiers for Aspect-Based Sentiment Analysis of Shopee Reviews Gondohanindijo, Jutono
Techno.Com Vol. 24 No. 4 (2025): November 2025
Publisher : LPPM Universitas Dian Nuswantoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62411/tc.v24i4.14976

Abstract

E-commerce platforms like Shopee generate massive volumes of user reviews that contain valuable insights about products, services, and user experiences. Aspect-Based Sentiment Analysis (ABSA) enables fine-grained sentiment classification by identifying sentiment polarity toward specific aspects such as product quality, pricing, delivery, and application performance. This study presents a comprehensive comparative analysis of different embedding techniques and classification models for ABSA on Indonesian Shopee reviews. We evaluate three embedding approaches: FastText, GloVe, and BERT embeddings, combined with four classification models: Support Vector Machine (SVM), Convolutional Neural Network (CNN), BERT, and IndoBERT. Our experiments focus on five key aspects: product, price, delivery, application, and general sentiment. The results demonstrate that FastText embeddings combined with IndoBERT classifier achieves the highest accuracy of 91.59%, while BERT embeddings show more balanced performance across different classifiers. The findings provide valuable insights for e-commerce platforms seeking to implement effective sentiment analysis systems for Indonesian market understanding. Keywords - Aspect-Based Sentiment Analysis, FastText, GloVe, BERT, IndoBERT
Enhancing Lung Cancer Classification Effectiveness Through Hyperparameter-Tuned Support Vector Machine Fita Sheila Gomiasti; Warto Warto; Etika Kartikadarma; Jutono Gondohanindijo; De Rosal Ignatius Moses Setiadi
Journal of Computing Theories and Applications Vol. 1 No. 4 (2024): JCTA 1(4) 2024
Publisher : Universitas Dian Nuswantoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62411/jcta.10106

Abstract

This research aims to improve the effectiveness of lung cancer classification performance using Support Vector Machines (SVM) with hyperparameter tuning. Using Radial Basis Function (RBF) kernels in SVM helps deal with non-linear problems. At the same time, hyperparameter tuning is done through Random Grid Search to find the best combination of parameters. Where the best parameter settings are C = 10, Gamma = 10, Probability = True. Test results show that the tuned SVM improves accuracy, precision, specificity, and F1 score significantly. However, there was a slight decrease in recall, namely 0.02. Even though recall is one of the most important measuring tools in disease classification, especially in imbalanced datasets, specificity also plays a vital role in avoiding misidentifying negative cases. Without hyperparameter tuning, the specificity results are so poor that considering both becomes very important. Overall, the best performance obtained by the proposed method is 0.99 for accuracy, 1.00 for precision, 0.98 for recall, 0.99 for f1-score, and 1.00 for specificity. This research confirms the potential of tuned SVMs in addressing complex data classification challenges and offers important insights for medical diagnostic applications.
Outlier Detection Using Gaussian Mixture Model Clustering to Optimize XGBoost for Credit Approval Prediction De Rosal Ignatius Moses Setiadi; Ahmad Rofiqul Muslikh; Syahroni Wahyu Iriananda; Warto Warto; Jutono Gondohanindijo; Arnold Adimabua Ojugo
Journal of Computing Theories and Applications Vol. 2 No. 2 (2024): JCTA 2(2) 2024
Publisher : Universitas Dian Nuswantoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62411/jcta.11638

Abstract

Credit approval prediction is one of the critical challenges in the financial industry, where the accuracy and efficiency of credit decision-making can significantly affect business risk. This study proposes an outlier detection method using the Gaussian Mixture Model (GMM) combined with Extreme Gradient Boosting (XGBoost) to improve prediction accuracy. GMM is used to detect outliers with a probabilistic approach, allowing for finer-grained anomaly identification compared to distance- or density-based methods. Furthermore, the data cleaned through GMM is processed using XGBoost, a decision tree-based boosting algorithm that efficiently handles complex datasets. This study compares the performance of XGBoost with various outlier detection methods, such as LOF, CBLOF, DBSCAN, IF, and K-Means, as well as various other classification algorithms based on machine learning and deep learning. Experimental results show that the combination of GMM and XGBoost provides the best performance with an accuracy of 95.493%, a recall of 91.650%, and an AUC of 95.145%, outperforming other models in the context of credit approval prediction on an imbalanced dataset. The proposed method has been proven to reduce prediction errors and improve the model's reliability in detecting eligible credit applications.
Analysis Kernel and Feature: Impact on Classification Performance on Speech Emotion Using Machine Learning Jutono Gondohanindijo; Edi Noersasongko; Pujiono Pujiono; Muljono Muljono
Jurnal Ilmiah Teknik Elektro Komputer dan Informatika Vol. 10 No. 3 (2024): September
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/jiteki.v10i3.29022

Abstract

The main objective of this study is to test the machine learning kernel's selection against the characteristics of the data set used, resulting in good classification performance. The goal of speech emotion recognition is to improve computers' ability to detect and process human emotions in order to improve their ability to respond to interactions between people and computers. It can be applied to feedback on talks, including sentimental or emotional content, as well as the detection of human mental health. One field of data mining work is Speech Emotion Recognition. One of the important things in data mining research is to determine the selection of the kernel Classifier, know the characteristics of datasets, perform Engineering Features and combine features and Corpus Datasets to obtain high accuracy. The research uses analysis and comparison methods using private and public datasets to detect speech emotions. Experimental analysis was done on the characteristics of datasets, selection of kernel classifiers, pre-processing, feature and corpus datasets fusion. Understanding the selection of a classifier kernel that matches the characteristics of the dataset, engineering features and the merger of features and datasets are the contributions of this investigation to improving the accuracy of the classification of speech emotion data. For models with the selection of kernels that match the characteristics of their datasets, this study gave an increase in accuracy of 12.30% for the private dataset and 14.80% for the public dataset, with accuracies of 100.00% and 74.80% respectively. Combining features and public datasets provides an increase in accuracy of 33.62% with an accuracy of 73.95%.
Co-Authors amin khudlori Arnold Adimabua Ojugo De Rosal Ignatius Moses Setiadi Dharmawan, Alexander Edi Noersasongko Eko Sediyono Etika Kartikadarma Fita Sheila Gomiasti Insiyyah, Insiyyah Jaya, Theofilus Palaun Lucy Hariadi Moch Saiful Umam Muljono, - Muslikh, Ahmad Rofiqul Prihati, Yani Pujiono Pujiono Putra, Jeremi Azero Putri, Christine Cecillia Syahroni Wahyu Iriananda Tiert, Baruch Daniel Warto Wicaksono, Adityo Putro Widayati, Yohana Tri Widjaja, Stephanus Widodo, Tulus Suryo