Journal of Informatics Management and Information Technology

Penerapan Internet of Things (IoT) Untuk Monitoring Kondisi Tanah Gembur Pada Tanaman Hias Pucuk Merah Secara Real-Time

Anggit Wahyu Edwinata — 2026-04-27

This research aims to develop a real-time Internet of Things (IoT) based loose soil pH monitoring system for application to red shoots ornamental plants. The system designed in this research combines a soil pH sensor to measure soil acidity levels, a NodeMCU ESP32 microcontroller as a data processor, a 16x2 I2C LCD to display local information, and provides real-time data to users through the Blynk application. The purpose of developing this system is that users can easily monitor soil conditions in real-time and take necessary actions to increase plant productivity, especially red shoots ornamental plants that require special attention to their soil conditions. This research is expected to be a continuation of previous research which is still in the design stage of a soil pH monitoring system. This development is focused on a different research object, namely loose soil pH in red shoots ornamental plants, so it is expected to be able to produce a more practical, applicable loose soil pH monitoring system, and provide a real contribution to the management of red shoots ornamental plants effectively and efficiently.

Optimasi Kinerja Algoritma Random Forest dengan SMOTE untuk Prediksi Kinerja Akademik Siswa

Muhammad Rizky Ramadhan — 2026-04-30

Student academic performance prediction is an essential component of Educational Data Mining (EDM) for the early identification of at-risk students. This approach aims to improve prediction accuracy and support decision-making for the early identification of at-risk students. This study proposes an optimized prediction pipeline that integrates feature engineering, Pearson Correlation-based Feature Filtering (PCFF), the Synthetic Minority Over-sampling Technique (SMOTE), and Random Forest (RF) to predict student academic performance. The Portuguese Student Performance Dataset (1,043 clean records; Pass = 814, Fail = 230) was used for evaluation. Four engineered features were constructed, reducing the feature space to 15 features through PCFF (threshold |r| ? 0.1). SMOTE was applied exclusively within each training fold to prevent data leakage. Two primary models were evaluated: a baseline Naïve Bayes model (Accuracy = 90.43%) and the proposed RF Default + SMOTE model (Accuracy = 93.78%, Recall = 95.09%, F1-score = 95.98%). Ten-fold stratified cross-validation achieved an accuracy of 90.89% ± 2.08%. The engineered feature G_avg obtained the highest feature importance score (0.285), outperforming the original grade features. The results demonstrate that integrating SMOTE and feature engineering significantly improves minority class detection, reducing False Negatives from 15 (baseline) to 8 (RF + SMOTE), representing a 46.7% improvement in identifying at-risk students.

Development of a Web Repository of ADDIE-Based Course Teaching Materials as an Institutional Digital Archive with ISO 25010 Evaluation

Muh. Wildan Mauludy — 2026-04-30

The storage of course teaching materials in the Department of Informatics and Computer Engineering, Makassar State University, has so far been separate for each lecturer and semester-based, thus complicating the process of archiving, searching, and reusing teaching materials across semesters. This study aims to develop a web repository of course teaching materials as a permanent centralized storage medium and to evaluate the quality of the resulting system. The research method used is Research and Development (R&D) with the ADDIE (Analyze, Design, Develop, Implement, and Evaluate) development model. The results of system quality testing based on the ISO 25010 standard show that the functional suitability aspect obtained a feature completeness value of 1 or 100%, the usability aspect achieved a feasibility percentage of 94.3% with a very feasible category, and the reliability aspect showed a test success rate of 100%. The performance efficiency test obtained a Grade A with an average page load time of 1.7 seconds, while the portability, compatibility, and maintainability tests showed that the system can run well on various devices and environments. Security testing using URLVoid demonstrated that the system meets basic security requirements, namely being free from malware based on domain reputation scanning, although in-depth code security testing has not yet been conducted. Based on these results, the developed course material web repository is deemed suitable for use as an institutional digital archiving system to support effective and sustainable management of teaching materials.