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Jurnal Informatika: Jurnal Pengembangan IT
Published by Politeknik Harapan Bersama Tegal
ISSN : 24775126     EISSN : 25489356     DOI : https://doi.org/10.30591
Core Subject : Science,
Computer Science & IT
The scope encompasses the Informatics Engineering, Computer Engineering and information Systems., but not limited to, the following scope: 1. Information Systems Information management e-Government E-business and e-Commerce Spatial Information Systems Geographical Information Systems IT Governance and Audits IT Service Management IT Project Management Information System Development Research Methods of Information Systems Software Quality Assurance 2. Computer Engineering Intelligent Systems Network Protocol and Management Robotic Computer Security Information Security and Privacy Information Forensics Network Security Protection Systems 3. Informatics Engineering Software Engineering Soft Computing Data Mining Information Retrieval Multimedia Technology Mobile Computing Artificial Intelligence Games Programming Computer Vision Image Processing, Embedded System Augmented/ Virtual Reality Image Processing Speech Recognition
Arjuna Subject : Ilmu Komputer (semua kategori) - Ilmu Komputer (Lain-Lain)
Articles 24 Documents
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Search results for , issue "Vol 10, No 4 (2025)" : 24 Documents clear
Implementasi Algoritma Support Vector Regression untuk Prediksi Harga Emas Berdasarkan Data Historis Hidayatulloh, M Rizqi; Yuwono, Dwi Purbo
Jurnal Informatika: Jurnal Pengembangan IT Vol 10, No 4 (2025)
Publisher : Politeknik Harapan Bersama

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30591/jpit.v10i4.9233

Abstract

Amidst global economic volatility, accurate forecasting of gold prices remains a crucial and challenging task for investors and financial policymakers, as gold functions as a vital safe-haven asset and a hedge against inflation. This study focuses on gold price prediction utilizing the Support Vector Regression (SVR) algorithm, with the main objective of improving forecast accuracy. The relevance of this prediction is underpinned by the dynamic characteristics of gold prices, which is essential for decision-making by various stakeholders. Historical gold price data were obtained from the investing.com platform. The SVR implementation was carried out utilizing the Radial Basis Function (RBF) kernel. The SVR parameter optimization process employing Grid Search successfully identified the optimal values, namely C=1000, ϵ=0.5, and γ=0.01. To ensure model robustness and generalization capability, validation was performed using 5-Fold Cross Validation, which yielded an average Mean Absolute Percentage Error (MAPE) of 0.66%. The very high level of SVR accuracy, alongside its consistency across each fold, stability, and reliability, indicates that the optimized SVR model is a prospective solution for gold price forecasting in the commodity market.
Pengembangan Aplikasi Chatbot Untuk Layanan Penerimaan Mahasiswa Baru Berbasis Natural Language Processing Setiyorini, Agustin
Jurnal Informatika: Jurnal Pengembangan IT Vol 10, No 4 (2025)
Publisher : Politeknik Harapan Bersama

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30591/jpit.v10i4.9406

Abstract

Abstrak – Penelitian ini bertujuan untuk mengembangkan dan mengimplementasikan sistem chatbot berbasis Natural Language Processing (NLP) untuk mendukung layanan informasi Penerimaan Mahasiswa Baru (PMB) di Universitas Janabadra. Layanan PMB selama ini masih bergantung pada interaksi manual yang terbatas pada jam kerja. Oleh karena itu, diperlukan solusi digital yang mampu memberikan informasi secara cepat, akurat, dan real-time. Sistem dikembangkan menggunakan framework CodeIgniter 4 dan memanfaatkan algoritma Naive Bayes untuk klasifikasi intent serta Levenshtein Distance untuk pencocokan kemiripan teks. Dataset pelatihan disusun berdasarkan kumpulan pertanyaan umum calon mahasiswa. Hasil evaluasi menunjukkan bahwa chatbot mampu menjawab 70% dari 500 pertanyaan secara otomatis dengan akurasi 92% dan waktu respons rata-rata 0,5 detik. Selain itu, chatbot mampu menurunkan beban kerja staf administrasi hingga 30%. Survei terhadap 100 pengguna menunjukkan bahwa 85% responden merasa puas terhadap kecepatan dan keakuratan respons sistem. Sistem ini juga mendukung penyimpanan konteks percakapan dan integrasi langsung dengan informasi PMB universitas. Penelitian ini menyimpulkan bahwa chatbot berbasis NLP dapat menjadi solusi efektif dalam meningkatkan efisiensi layanan informasi pendidikan tinggi. Pengembangan lanjutan diarahkan pada perluasan dataset, adopsi model NLP berbasis Transformer, serta integrasi lintas platform komunikasi untuk memperluas jangkauan layanan. Kata Kunci: Chatbot, Natural Language Processing, Naive Bayes, Levenshtein Distance, Penerimaan Mahasiswa Baru.
Pengembangan Aplikasi Prediksi Harga Emas Berbasis Web Menggunakan Model Time Series Abdullah, Fikrian Nur; Nurardian, Ridwana Septian; Liya, Amel; Saputra, Ari Setia; Saputra, Atio Wahyudi; Bismi, Waeisul
Jurnal Informatika: Jurnal Pengembangan IT Vol 10, No 4 (2025)
Publisher : Politeknik Harapan Bersama

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30591/jpit.v10i4.9165

Abstract

High gold price volatility due to global economic instability poses challenges in investment decision-making. This research aims to develop a web-based gold price prediction application using a time series model, focusing on the Gated Recurrent Unit (GRU) algorithm. This application is designed to present real-time, accurate, and easily accessible gold price predictions, thereby increasing the efficiency and transparency of information for investment decision making. The development process starts from collecting and preprocessing daily gold price data for the period 2013-2023, then comparing four predictive models: LSTM, GRU, ARIMA, and XGBoost. Evaluation is performed using MAE, RMSE, and R² metrics. Results showed that GRU provided the best performance with an RMSE value of 17.76 and R² of 0.9410. The GRU model is integrated into a web application using the Flask framework, with an interactive HTML-based interface and Chart.js visualization. This application presents real-time gold price predictions and can be accessed by general users and investors. The results of this study show that the time series approach with GRU is effective in projecting gold prices, and can be a relevant tool in supporting data-based investment decisions.
Enhancing PCOS Classification with Weighted Loss-Based Neural Network on Imbalanced Data Maslakhah, Amanda; Hakim, Lukman
Jurnal Informatika: Jurnal Pengembangan IT Vol 10, No 4 (2025)
Publisher : Politeknik Harapan Bersama

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30591/jpit.v10i4.9449

Abstract

Polycystic Ovary Syndrome (PCOS) represents a multifaceted endocrine–metabolic condition that poses a significant risk to reproductive health in women of childbearing age. The disorder is influenced by various contributing factors and is commonly associated with clinical features such as disrupted ovulation, hormonal imbalance due to excess androgens, and morphological changes in the ovaries. In automated PCOS classification, a major limitation arises from the disproportionate distribution of data samples, in which instances without PCOS considerably outnumber affected cases. This imbalance tends to bias predictive models toward the dominant class, thereby reducing the detection capability for minority instances and increasing the likelihood of missed PCOS diagnoses. To address this issue, this study proposes the incorporation of a Weighted Loss Function into a Neural Network-based classification framework aimed at improving sensitivity to PCOS cases. The research workflow comprises data preprocessing, neural network architecture construction, integration of class-weighted loss, and systematic experimentation across multiple architectural designs and training configurations. The experimental findings demonstrate that applying a Weighted Loss Function with manually assigned class weights of 1:2, a learning rate of 0.001, five hidden layers, and 50 training epochs delivers optimal classification performance. Under these settings, the model achieves high values across evaluation metrics, including precision, recall, F1-score, and overall accuracy, reaching up to 99%. The results confirm that the proposed approach effectively mitigates majority-class bias and enhances the model’s ability to identify PCOS cases. This improvement is further reinforced through careful hyperparameter tuning and comprehensive experimental evaluation.

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