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All Journal Computatio : Journal of Computer Science and Information Systems Jurnal Kecerdasan Buatan dan Teknologi Informasi
Melani Indriasari
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Computer Science & IT

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Teknik Serangan Pada Aplikasi Berbasis Ruby on Rails Suryo Bramasto; Melani Indriasari
Computatio : Journal of Computer Science and Information Systems Vol 1, No 2 (2017): Computatio : Journal of Computer Science and Information Systems
Publisher : Faculty of Information Technology, Universitas Tarumanagara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24912/computatio.v1i2.1009

Abstract

Ruby on Rails (Rails) merupakan salah satu framework platform aplikasi berbasis web yangdewasa ini banyak digunakan. Segala sesuatu yang berbasis web senantiasa rentan terhadapserangan cyber. Penyerang senantiasa berusaha mencari titik lemah (vulnerabilities) padasetiap framework platform berbasis web yang ada. Secara umum Rails merupakan frameworkyang relatif aman dari serangan, namun tetap memiliki titik lemah. Titik lemah pada sistemberbasis web pada umumnya merupakan teknik serangan, begitu pula pada Rails. Artikel inimemaparkan bagaimana membangun teknik serangan pada Rails. Teknik serangan dibangundengan melakukan exploit yang memanfaatkan kelengahan pengembang yang tidakmenerapkan cara memprogram yang aman pada Rails. Teknik serangan yang dibangun adalahmenyalahgunakan fitur konversi otomatis pada tipe data dan melakukan injeksi kode.
WALMART PRICE PREDICTION USING HOLT-WINTERS FORECASTING Melani Indriasari; Soleh, Muhamad; Muhamad Ramli; Sunarto; Sumiarti Andri
Jurnal Kecerdasan Buatan dan Teknologi Informasi Vol. 5 No. 2 (2026): May 2026
Publisher : Ninety Media Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.69916/jkbti.v5i2.438

Abstract

Stock price prediction remains a complex challenge due to the volatile, noisy, and nonlinear nature of financial markets. This study aims to evaluate the effectiveness of the Holt-Winters Exponential Smoothing (HWES) method in forecasting the stock price of Walmart Inc. (WMT) and its application in investment decision-making. Historical monthly closing price data from January 2020 to December 2024 were collected and used to build an additive Holt-Winters model. The model was validated using out-of-sample data from January to February 2025, achieving RMSE of 4.535 USD and MAE of 4.801 USD, indicating good short-term predictive performance. The model was then used to forecast stock prices from March 2025 to December 2026, revealing a consistent upward trend with moderate seasonal fluctuations. However, deviations between predicted and actual values were observed during periods of market volatility, particularly in late 2025. To further evaluate performance, the Holt-Winters model was compared with the ARIMA model. Results show that ARIMA outperformed Holt-Winters in short-term forecasting with lower RMSE (4.71), MAE (4.26), and MAPE (4.21%), while Holt-Winters was more effective in capturing seasonal patterns. An investment simulation using a Dollar Cost Averaging (DCA) strategy combined with technical analysis indicators produced a total return of 3.45%, supported by both capital gains and dividend income. These findings suggest that while Holt-Winters provides a simple and interpretable approach for long-term forecasting, its performance can be improved by integrating adaptive models and external factors such as market sentiment and macroeconomic conditions for more robust predictions.
Co-Authors Muhamad Ramli Muhamad Soleh Sumiarti Andri SUNARTO Suryo Bramasto