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All Journal ComTech: Computer, Mathematics and Engineering Applications Indonesian Journal of Business Intelligence (IJUBI)
Sari, Devina Intan
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Computer Science & IT Decision Sciences, Operations Research & Management Engineering Mathematics

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A Novel Machine Learning for Ethanol and Methanol Classification with Capacitive Soil Moisture (CSM) Sensors Sari, Devina Intan; Trihandaru, Suryasatriya; Parhusip, Hanna Arini
ComTech: Computer, Mathematics and Engineering Applications Vol. 15 No. 2 (2024): ComTech
Publisher : Bina Nusantara University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21512/comtech.v15i2.12051

Abstract

Although Gas Chromatography (GC) is highly accurate, it is costly, highlighting the need for a more affordable method for alcohol detection. Ethanol and methanol have different evaporation rates and dielectric constants, suggesting the potential for classification as an alternative initial step to GC based on differences in dielectric due to evaporation using Capacitive Soil Moisture (CSM) sensors, although it has not been previously attempted. The research aimed to present a novel machine learning for ethanol and methanol classification with CSM sensors. The method involved placing evaporated samples on CSM plates and measuring the change in evaporative dielectric properties over time. The data were then processed using Python, preprocessing data, splitting data, and training various classifiers with key differentiators based on standard deviation, mean, difference, and cumulative summary. Then, model accuracy was evaluated. The research results show that the approach can distinguish between pure ethanol and methanol based on the dielectric differences in each substance's evaporation rate using machine learning training methods with classifiers such as Random Forest, Extra Trees, Gaussian Naive Bayes, AdaBoost, and Logistic Regression with seven folds in cross-validation, L2 regularization, and Newton-Cholesky solver, with accuracies of 96.67%, 96.67%, 96.67%, 93.33%, and 93.33%, respectively. Although the research is limited to the classification of two types of alcohol, the novel approach can classify methanol and ethanol, leading to a potential initial step in determining alcohol content in the future. It can be an alternative to GC with a simpler and more affordable setup using CSM sensors.
PREDIKSI DAN EVALUASI POTENSI KEUNTUNGAN SAHAM PERBANKAN HIMBARA MENGGUNAKAN METODE LSTM Susetyo, Yosia Adi; Sari, Devina Intan; Wijono, Sutarto
Indonesian Journal of Business Intelligence (IJUBI) Vol 8 No 1 (2025): Indonesian Journal of Business Intelligence (IJUBI)
Publisher : Universitas Alma Ata

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21927/ijubi.v8i1.4415

Abstract

Penelitian ini mengkaji prediksi harga saham dan analisis potensi untung dan rugi dari investasi saham di sektor perbankan khususnya pada bank negara BBNI, BBTN, BBRI dan BMRI. Prediksi menggunakan teknik pembelajaran mesin, dengan metode Long Short-Term Memory (LSTM). Model yang dibangun dan dilatih menggunakan optimizer adam, batch size 32 dan jumlah epoch 200. Model dilatih dan dikembangkan menggunakan data harga penutupan saham selama tiga tahun terakhir. Hasil dari prediksi model ditujukan untuk periode 30 hari ke depan, sehingga mampu memberikan informasi yang berharga bagi pelaku pasar saham untuk melakukan aksi jual atau beli. Evaluasi LSTM dalam memodelkan data menunjukkan tingkat akurasi (R 2 ) antara 0.9522 hingga 0.9712, dengan Mean Square Error (MSE) berkisar antara 796.55 hingga 15508.82 , Mean Absolute Error (MAE) antara 20.48 hingga 73-74 dan Root Mean Squared Error (RMSE) antara 28.22-124.53 , hasil evaluasi menunjukkan LSTM yang dibangun terbukti akurat dalam memprediksi harga saham.
Co-Authors Hanna Arini Parhusip Suryasatriya Trihandaru Susetyo, Yosia Adi Sutarto Wijono