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All Journal International Journal of Evaluation and Research in Education (IJERE) Paradikma: Jurnal Pendidikan Matematika AKSIOMA: Jurnal Program Studi Pendidikan Matematika Jurnal Daya Matematis JURNAL PENGABDIAN KEPADA MASYARAKAT Jurnal Elemen Jurnal KARISMATIKA Edumatsains Al Ishlah Jurnal Pendidikan JURNAL SAINS INDONESIA JURNAL TARBIYAH AXIOM : Jurnal Pendidikan dan Matematika Jurnal Cendekia : Jurnal Pendidikan Matematika Indonesian Journal of Education and Mathematical Science Ideguru: Jurnal Karya Ilmiah Guru Jurnal Dinamika Informatika (JDI) Formosa Journal of Applied Sciences (FJAS) Ranah Research : Journal of Multidisciplinary Research and Development
Elmanani Simamora
Universitas Negeri Medan
Religion Agriculture, Biological Sciences & Forestry Arts Humanities Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Library & Information Science Mathematics Physics Public Health Social Sciences Transportation Other

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IMPLEMENTASI LONG SHORT-TERM MOMORY DALAM PREDIKSI HARGA SAHAM BANK BERDASARKAN DATA TIME SERIES BERBASIS WEBSITE Fadlan Azmi; Elmanani Simamora; Said Iskandar Al Idrus; Sudianto Manullang; Zulfahmi Indra
Jurnal Dinamika Informatika Vol. 15 No. 2 (2026): Vol. 15 No. 2 (2026)
Publisher : Program Studi Informatika Universitas PGRI Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31316/jdi.v15i2.496

Abstract

Prediksi harga saham merupakan tantangan kompleks dalam dunia investasi karena volatilitas pasar yang tinggi. Penelitian ini bertujuan mengembangkan model prediksi harga saham Bank Negara Indonesia menggunakan Metode Long Short Term Memory berbasis data Time Series. Data historis saham BBNI periode Januari 2013 hingga Desember 2023 diperoleh dari Yahoo Finance, meliputi atribut harga pembukaan, penutupan, tertinggi, terendah, volume perdagangan, serta indikator teknikal Average dan Relative Strength Index. Metode penelitian meliputi tahap preprocessing data dengan ekstraksi fitur, normalisasi menggunakan MinMaxScaler, dan pembagian data dengan rasio 80:20 untuk data latih dan data uji. Model LSTM dikonstruksi dengan arsitektur dua lapis tersembunyi masing-masing 50 neuron, dropout layer untuk mencegah overfitting, optimizer Adam, dan fungsi aktivasi ReLU. Hasil evaluasi menunjukkan model mencapai nilai Mean Absolute Percentage Error sebesar 1,89 persen, mengindikasikan tingkat akurasi prediksi yang tinggi. Visualisasi grafik perbandingan antara harga aktual dan prediksi memperlihatkan model mampu mengikuti tren pergerakan harga dengan baik. Model diintegrasikan ke dalam aplikasi web berbasis Flask untuk memudahkan pengguna melakukan prediksi secara interaktif. Penelitian ini memberikan kontribusi signifikan bagi investor dan analis keuangan dalam membuat keputusan investasi yang lebih tepat. Implementasi LSTM terbukti efektif dalam menangkap pola temporal pada data time series saham, sehingga dapat menjadi alat bantu prediksi yang andal untuk mendukung strategi investasi di pasar modal Indonesia.
Development of an Interactive E-Book Learning Media Assisted by the AnyFlip Application on the Topic of Solid Geometry with Flat Surfaces Lois Tambunan; Mukhtar; Elmanani Simamora
EduMatSains : Jurnal Pendidikan, Matematika dan Sains Vol 11 No 2 (2026): October
Publisher : Fakultas Keguruan dan Ilmu Pendidikan, Universitas Kristen Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33541/edumatsains.v11i2.8365

Abstract

This study aimed to develop an interactive e-book assisted by the AnyFlip application on the topic of flat-sided geometric solids for junior high school students. The study employed the Research and Development (R&D) method using the 4-D development model, implemented up to the develop stage. The product focused on the processes of designing, creating, validating, and refining learning media to ensure its feasibility for classroom use. The developed product was an interactive e-book combining text, images, learning videos, and practice exercises to create a more engaging and understandable learning process. The research subjects consisted of media experts, material experts, and 25 eighth-grade students of SMP YP HKBP Pematangsiantar. Data were collected using validation sheets and student response questionnaires with a Likert scale. The validation result from media experts obtained a percentage of 87.89%, categorized as valid, while the material expert validation obtained 86.25%, also categorized as valid. The product trial conducted with students obtained a percentage of 79.6%, categorized as effective. The e-book also integrated an ethnomathematics approach through examples of geometric solids related to local culture, making learning more contextual and engaging. Based on the results, the interactive e-book assisted by the AnyFlip application was declared feasible and effective as a mathematics learning medium on the topic of flat-sided geometric solids. The student trials showed positive responses and helped students become more interested in and better understand the learning material.
Co-Authors Abil Mansyur, Abil Agustina Hariani Panjaitan Andrew Lupe Tiopan Sitorus Asmin Asmin Asmin Panjaitan Asrifah Siahaan Budi Halomoloan Siregar Chindy Eskana Nababan Dessy Meylinda Dian Armanto E. Elvis Napitupulu Edi Syahputra Edy Surya Elsa . Oktaviani Fadlan Azmi Haris Hidayat Ismail Izwita Dewi Izwita Dewi Lisa Lisa Lois Tambunan Manullang, Sudianto Maulidia Wanahari Maulidia Wanahari Lubis Muhammad Badzlan Darari Mukhtar Mukhtar Mukhtar Muktar Muktar Mulyono Mulyono Nenta Dumalia Siregar NETTI KARIANI MENDOFA Nur Indah Simamora Pakpahan, Robinsar Permata Sari Manurung Putri Elmaretha Purba Putri Elmaretha Purba Rahmi Ramadhani Riadil Jannah Sihombing Rizki Habibi Rusmini Rusmini Rusmini Rusmini Said . Iskandar Sorta Corie Ivana Panjaitan Suvriadi Panggabean Tiur Malasari Siregar Vivi Lathifah Ardi Waminton Rajagukguk Yenni Padila Siregar Zul Amry Zulfahmi Indra, Zulfahmi