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All Journal TEKNIK INFORMATIKA Jurnal Teknologi dan Sistem Komputer SINTECH (Science and Information Technology) Journal Jurnal Nasional Pendidikan Teknik Informatika (JANAPATI) IJID (International Journal on Informatics for Development) JISKa (Jurnal Informatika Sunan Kalijaga) Jurnal EK dan BI
Maria Ulfah Siregar
Universitas Islam Negeri Sunan Kalijaga
Computer Science & IT Economics, Econometrics & Finance Education Electrical & Electronics Engineering Engineering Library & Information Science

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An Efficient Journal Articles Searching using Vector Space Model Algorithm Azis Alvriyanto; Muhammad Taufiq Nuruzzaman; Maria Ulfah Siregar; Rahmat Hidayat
IJID (International Journal on Informatics for Development) Vol. 9 No. 1 (2020): IJID June
Publisher : Faculty of Science and Technology, Universitas Islam Negeri (UIN) Sunan Kalijaga Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14421/ijid.2020.09104

Abstract

One of the main feature of digital library is a search engine which depends on keywords submitted by a user. However, in the traditional algorithm, the computation performance, searching speed, significantly relies on the number of journal articles stored in the databases. Some irrelevant search results also increase the speed of article searching process. To solve the problem, in this paper we propose vector space model (VSM) algorithm to search for relevant journal articles. The VSM algorithm considers a term frequency - inversed document frequency (TF-IDF). The VSM algorithm will be compared to the baseline algorithm namely traditional algorithm. Both algorithms will be evaluated using combination of keywords which can be a synonym, phrase, error typography, or suffix and prefix. By using the data consist of 635 journal articles, both algorithms are compared in terms of 11 evaluation criteria. The results show that VSM algorithm is able to obtain the intended journal at 5th rank on average as compared to the traditional algorithm which can obtain the intended journal at rank of 171st on average. Therefore, our proposed algorithm can improve the performance to accurately sort the journal articles based on the submitted keywords as compared to traditional algorithm.   
Price Forecasting of Chili Variant Commodities Using Radial Basis Function Neural Network Ade Umar Ramadhan; Maria Ulfah Siregar; Syifaun Nafisah; Muhammad Anshari; Rebeccah Ndungi; Rizki Mulyawan; Nurochman Nurochman; Eko Hadi Gunawan
IJID (International Journal on Informatics for Development) Vol. 12 No. 1 (2023): IJID June
Publisher : Faculty of Science and Technology, Universitas Islam Negeri (UIN) Sunan Kalijaga Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14421/ijid.2023.5129

Abstract

This study addresses the challenge of price instability in chili markets, which can lead to economic losses and inflation. To mitigate this issue, we propose a machine learning model using Radial Basis Function Neural Networks (RBFNN) to predict prices of various chili variants. Our quantitative approach involves a comprehensive data preparation process, including preprocessing and normalization of time series data collected from 2018 to 2022. The RBFNN model is constructed with K-Means clustering for optimal hidden layer configurations and evaluated using Mean Absolute Percentage Error (MAPE) and Root Mean Square Error (RMSE). The results demonstrate promising accuracy, with MAPE error rates below 20% and relatively low RMSE values for large red chili (10.37%, 4484) and curly red chili (14.77%, 5590). Our findings indicate the potential for creating a reliable forecast model for predicting chili prices over 7 days, enabling better supply and demand management. The study's results also suggest that increased training data enhances forecasting accuracy. This research contributes to the development of effective price forecasting models, providing valuable insights for policymakers and stakeholders in the chili industry.
Co-Authors Ade Umar Ramadhan Ahmad Hasan Arif Ahmad Subhan Yazid Alifah Amalia Annisa Dwi Oktavianita Azis Alvriyanto Bambang Sugiantoro Devara Eko Katon Mahardika Dony Fahrudy Eko Hadi Gunawan Fanny Novianto Fauzi, Muhammad Dzulfikar Febri Eka Setyawan Izza Afkarina John Derrick Khurin 'ien Mukhoyyaroh Mohammad Farhan Qudratullah Mr. Fitree Tahe Muhamad Fadli Muhammad Anshari Muhammad Edi Iswanto Muhammad Taufiq Nuruzzaman Nisaa Ratna Marliana Nurochman Nurochman Rahmat Hidayat Rebeccah Ndungi Rinny Assasunnaja Rizki Mulyawan Saiful Bahri Sayekti Abriani Sherly Andini Shofwatul ‘Uyun Sugriyono Sugriyono Sumarsono Sumarsono Sunu Pinasthika Fajar Syifaun Nafisah Taufiq Effendy Wijatmoko Wildan Nadiyal Ahsan