Algorithm Optimizer in GA-LSTM for Stock Price Forecasting Yohanes Leonardus Sukestiyarno, Dian Tri Wiyanti, Lathifatul Azizah, Wahyu Widada Contemporary Mathematics Singapore, 2024 Fluctuating stock prices make it difficult for investors to see investment opportunities. One tool that can help investors overcome this is represented by forecasting techniques. Long Short-Term Memory (LSTM) is one of deep learning methods used in forecasting time series. The training and success of deep learning is strongly influenced by the selection of hyperparameters. This research uses a hybrid method between the Genetic Algorithm (GA) and LSTM to find a suitable model for predicting stock prices. GA is used in optimizing the architecture such as the number of epochs, window size, and the number of LSTM units in the hidden layer. Tuning optimizer is also carried out using several optimizers to achieve the best value. From method that has been applied, it shows that the method has a good level of accuracy with MAPE values below 10% in every optimizer used. The error rate generated is quite low, in case-1 with a minimum RMSE value of 93.03 and 94.40, & in case-2 with an RMSE value of 104.99 and 150.06 during training and testing. A fairly stable and small value is generated by setting it using the Adam Optimizer.
Integrated Education and Learning 2050 Nima Rezaei, Amene Saghazadeh, Abdurrahman Abdurrahman, Alessandro Ciasullo, Alexander Liaptsev, Brian Lighthill, Delfín Ortega-Sánchez, Dewi Herawaty, Diler Oner, Emmanuel Manalo, Erdoğan Tezci, Flavia Santoianni, George Gadanidis, Gerald P. Ardito, Ghsoon Reda, Göran Sonesson, Horace Crogman, Johar Maknun, Kaan Bati, Laura Felleman Fattal, Lisa Cognard, Macarena-Paz Celume, Maria Hofman-Bergholm, Maury Jackson, Nicole Leggett, Nurulwahida Azid, Osman Yaşar, Rosa Cendros, Sedat Ucar, Sergei Pozdniakov, Sila Kaya-Capocci, Tee Tze Kiong, Valentina Dagienė, Vladimiras Dolgopolovas, Wahyu Widada, Yalçın Dilekli, Yeliz Gunal Aggul, Zoé Chamot Integrated Science, 2022
Analysis of teacher performance to build student interest and motivation towards mathematics achievement Hardi Tambunan, Bornok Sinaga, Wahyu Widada International Journal of Evaluation and Research in Education, 2021 <span>The purpose of this study was to determine the impact and categories of teacher performance in building student interest and motivation on mathematics achievement. The population in this study was students in the eighth grade of junior high schools from six public and two private schools, and a sample of 277 students was taken by cluster sampling. Data collection instruments used a questionnaire, and data analysis was done by using by descriptive and path analysis. The results of data analysis showed that partially, teacher performance significantly affected student interest and motivation excel at mathematics. Simultaneously, teacher performance is very significant in influencing student interest and motivation to be excellent in mathematics. Partially, teacher performance builds interest and student motivation for mathematics achievement is low category. Simultaneously, teacher performance builds student interest and motivation to excel at mathematics is low category. Both of these can be caused by the ability of teachers to build motivation and interest is not good, so students are also less interested and motivated to learn mathematics.</span>
Augmented Reality assisted by GeoGebra 3-D for geometry learning W. Widada, D. Herawaty, K. U. Z. Nugroho, A. Anggoro Journal of Physics Conference Series, 2021 Geometry becomes a difficult subject for students. The abstract object was one of the factors. Therefore, more concrete learning media are needed. One of them was augmented reality assisted by GeoGebra. The purpose of this study was to determine the ability to understand the geometrical concepts of high school students through augmented reality learning assisted by GeoGebra. Treatment was given to students through learning using GeoGebra-assisted augmented reality. This was a quasi-experimental study with a pre-test post-test control group design. This research instrument was a test of the ability to understand the concept of geometry. The test was used to measure students’ initial abilities, and this was referred to as a covariate. Also, to measure the ability to understand concepts after students follow augmented reality learning assisted by GeoGebra. Data were analyzed by covariate analysis (ANCOVA). The results of this study were F = Fo (A) = 9,150 with p-value = 0,000 <0,005. That means, there are differences in the ability to understand the concept of geometry between those taught with augmented reality which is assisted by GeoGebra and conventional learning. Other results show that t = 6.723 with p-value = 0.000 <0.05. This shows that the ability to understand the geometry concepts of students taught with augmented reality assisted by GeoGebra was higher than students who were taught conventionally after controlling for covariates. The conclusion was that the ability to understand the concepts of geometry through GeoGebra-assisted augmented reality learning was better than students taught with ordinary learning.
The ability to solve mathematical problems through realistic mathematics learning based on ethnomathematics A. Lubis, W. Widada, D. Herawaty, K. U. Z. Nugroho, A. Anggoro Journal of Physics Conference Series, 2021 Problem-solving is one of the goals of mathematics learning. Ethnomimetic-based realistic mathematics learning is learning with starting-point contextual problems that are close to students’ minds. This study aims to determine the effect of ethnomathematics-oriented realistic mathematics learning on problem-solving abilities. That is a type of quasi-experimental research. The study design was a non-equivalent control group. The population is SMA N 2 Kota Bengkulu in 2019. The sample of this study was 68 students from Class X MIPA A and X MIPA D. The research instrument was a test of problem-solving skills. Data were collected through tests and analysed by covariate analysis. The results of this study are that realistic mathematics learning oriented to ethnomathematics has a positive effect on the ability to solve. The conclusion is that realistic mathematics learning with ethnomathematics orientation can improve mathematical problem-solving skills for secondary school students. We suggest that mathematics teachers can develop realistic mathematics learning tools with ethnomathematics as a starting point for learning.
The exploration of the elementary geometry concepts based on Tabot culture in Bengkulu N. Agusdianita, W. Widada, N. Afriani, H. Herawati, D. Herawaty, K. U. Z. Nugroho Journal of Physics Conference Series, 2021 Geometry’s direct objects were abstract. It was a learning material that was difficult for elementary students. Therefore, learning was needed close to the minds and daily lives of students. One of them was “Tabot” Culture. That was the ethnomatematics approach. The purpose of this research was to explore elementary geometry concepts based on Tabot Culture. We apply an explorative-qualitative approach. The subjects of this study were the makers of the Tabot, elementary students, and elementary mathematics teachers. This was a needs analysis. Activities were carried out through direct observation, documentation, in-depth interviews and focus group discussions. The research instruments were anecdotal direct observation sheets, and interview guides. Data were analysed qualitatively. The results of the study found that the culture of Tabot provides reinforcement of student character that was obeying the principle, thinking logically, critically, working hard, curiosity, independence, confidence. The geometrical concepts that exist in the Tabot culture were the cube, the beam, the pyramid, the prism, the sphere and its elements. Also, understanding of two-dimensional figure. We conclude that Bengkulu Tabot culture can be used as a starting-point for learning the achievement of geometrical concepts and strengthening student character.
The cognitive process of students understanding quadratic equations D Herawaty, W Widada, W Gede, D Lusiana, Y Pusvita, Y Widiarti, A F D Anggoro Journal of Physics Conference Series, 2021 Algebra is mandatory learning in junior high school. That is a continuation of arithmetic with the bridge being variable. Students often have difficulty in understanding it, especially quadratic equations. The purpose of this study is how students’ cognitive processes in understanding the principles of quadratic equations. It was an exploratory study conducted on research subjects. The subjects were junior high school students selected based on their ability to understand concepts and principles about quadratic equations. That’s done through tests about understanding quadratic equations. There were 16 selected research subjects. They were interviewed in-depth by researchers using interview guides. Interview data were analyzed qualitatively based on genetic decomposition. The results of this study are that students can use square, rectangular and unit square cards to determine the principle of factorization of quadratic equations. Students can generalize until completing a perfect quadratic equation. The conclusion is that the cognitive process of students who learn to use learning media based on square and rectangular able to reach a high level (trans-level).
Multiplication and division of integers through cultural approaches of playing dakon W Widada, D Herawaty, Y Pusvita, D Anggreni, R Aripianti, B Panduwinata Journal of Physics Conference Series, 2020 Playing dakon has become a culture in Bengkulu. Since I was in kindergarten, dakon has been a fun game. It has the character of sharing fruit in each dakon convex (or hole). It becomes the starting-point of learning multiplication and division. The purpose of this study was to determine students’ thought processes in understanding the principle of multiplication and the division of integers through the cultural approach to playing the dakon. To achieve the goal, achieved through qualitative-explorative research. The subjects of this study were elementary students in Bengkulu City who were selected based on assignments. It was selected from 30 students who were given assignments about multiplication and division of integers. Students are given instructions using worksheets. After students submit their assignments, they are analyzed to select 2 students who have the thought process in achieving the principle of division and multiplication appropriately. Subjects were interviewed in-depth by researchers. Data were analyzed based on the genetic decomposition of research subjects. The results of this study are the Subject-1 can use the dakon to show the multiplicative properties of positive integers. He demonstrated that 4x3 by inserting it into four small dakon curves and three dakon seeds each. She concluded that multiplication is a repeated sum. Subject-2 uses the dakon to find the concept of dividing two positive integers. Subject-2 shows that 12: 4 by taking dakon seeds from a large curvature containing twelve seeds. She concluded that the division is a repeat reduction. This research concludes that Subject-1 and Subject-2 can build an understanding of operations multiplication and division, including verbal communication, writing, and drawing based on real media from local culture, namely the dakon game.
The abstraction ability about natural numbers through playing traditional music for elementary students D Herawaty, W Widada, H Ardy, R Furqany, Suharto, A F Dwi Anggoro Journal of Physics Conference Series, 2020 The ability of music has a positive impact on the balance of thinking. The purpose of this study is to determine whether the musical ability has a direct effect on the ability of abstraction of native numbers of elementary school students at a low level. This is survey research as an evaluation stage for the development of elementary thematic learning models in Kota Bengkulu, Indonesia. The research sample was 95 elementary school students in Kota Bengkulu. The instruments of this research were musical ability tests and abstraction ability test. Data were analyzed through the Lisrel 8.8 test. The results of this study is that musical ability has a direct positive effect on the ability of abstraction of native elementary students to a low level.
Characteristics of students thinking in understanding geometry in learning ethnomathematics International Journal of Scientific and Technology Research, 2019
The ability to solve mathematical problems through youtube based ethnomathematics learning International Journal of Scientific and Technology Research, 2019
The Relationship Between Mathematical Critical Thinking Ability and Students’ Political Literacy in Senior High School W Widada, NA Yensy, A Suningsih Journal of Pedagogy and Education Science 5 (01), 388-400 , 2026 2026
in Steel Pipes Using Magnetic Induction Tomography Sensor Modeling K Nugraha, W Winarto, D Haryono, A Sholehah, W Widada, H Nugraha, ... Proceedings of the International Conference on Smart and Advanced … , 2025 2025
Enhancing PISA-like Mathematical Literacy through Deep Learning assisted by Mathos AI for Junior High School Students W Widada, KUZ Nugroho, M Masri, AFD Anggoro, D Herawaty, R Jumri, ... Jurnal Math Educator Nusantara 11 (1), 1-20 , 2025 2025 Citations: 3
Problematika Dan Solusi Dalam Pembelajaran Geometri Non-Euclide KUZ Nugroho, W Widada, YL Sukestiyarno, SB Waluya, D Herawaty, ... Feniks Muda Sejahtera , 2025 2025 Citations: 2
INITIAL DESIGN FOR LEARNING THEORY INTRODUCTION TO RIEMANN GEOMETRY THROUGH AN ETHNOMATHEMATICS LEARNING APPROACH KUZ Nugroho, W Widada, AFD Anggoro, SDT Anggoro Jurnal Lebesgue: Jurnal Ilmiah Pendidikan Matematika, Matematika dan … , 2025 2025
WORKSHOP PEMBUATAN MEDIA PEMBELAJARAN DARING BERBANTUAN LIVEWORKSHEET UNTUK GURU MATEMATIKA MADRASAH IBTIDAIYAH KUZ Nugroho, AFD Anggoro, W Widada, SDT Anggoro SETAWAR ABDIMAS 4 (1), 1-8 , 2025 2025 Citations: 7
Analysis of the Effect of Analog Switches on the Digital Signal Oscilloscope Circuit A Yusuf, W Widada, WP Taruno, I Muttakin 2024 International Conference on Informatics Electrical and Electronics … , 2024 2024 Citations: 1
FPGA driving periodic pseudo random number signal for ranging system NW Jatmiko, W Widada, ED Arisandi AIP Conference Proceedings 3215 (1), 080001 , 2024 2024
Static and dynamic GPS receiver verification tests using software defined radio S Kliwati, R Wiryadinata, I Muttakin, H Setyawan, R Rustamaji, W Widada Teknika: Jurnal Sains dan Teknologi 20 (1), 40-45 , 2024 2024
Biotechnology project-based learning encourages learning and mathematics application Jiménez-Gaona Y, Vivanco-Galván O, W Widada Frontiers in Education 9, 1-12 , 2024 2024
A critical turn in numeracy education and practice V Geiger, M Schmid, W Widada Frontiers in Education 9, 1-13 , 2024 2024 Citations: 26
Modeling the development of pedagogical competence in higher education educators amid the digitization of the contemporary world K Z, M N, S I, G Z, M A, U A, W Widada Frontiers in Education 9, 1-13 , 2024 2024
Gamification for teaching the Arabic language to non-native speakers: a systematic literature review SA Almelhes, W Widada Frontiers in Education 9, 1-13 , 2024 2024 Citations: 85
Virtual reality in the classroom: a difficult but exciting adventure for teachers and students JL Rodríguez, J Mason, W Widada Frontiers in Education 9, 1-13 , 2024 2024
Farmer’s willingness to accept the sustainable zoning-based organic farming development plan: A lesson from Sleman District, Indonesia I Irham, A Nurhayati, AW Widada, S Subejo, LY Devi, R Simarmata, ... Open Agriculture 9 (1), 20220253 , 2024 2024 Citations: 8
Motor strength as a feature of concepts and visual representations Khatin-Zadeh O, HJ Farsani D, W Widada Frontiers in Psychology 15, 1-13 , 2024 2024
Assessing authenticity in modelling test items: deriving a theoretical model D Schlüter, M Besser, W Widada Frontiers in Education 9, 1-12 , 2024 2024 Citations: 8
Design and implementation of virtual laboratories for higher education sustainability: a case study of Nankai University N Zhang, Y Liu, W Widada Frontiers in Education 9, 1-12 , 2024 2024
The effectiveness of the educational preparation program from the point of view of field training students specializing in social studies M Hendawi, M Nosair, S Qadhi, MM Ashraah, W Widada Frontiers in Education 9, 1-12 , 2024 2024
Software Defined Radio, a perspective from education MA Ramos, R Camacho, PA Buitrago, RD Urda, JP Restrepo, W Widada Frontiers in Education 9, 1-13 , 2024 2024
MOST CITED SCHOLAR PUBLICATIONS
Realistic mathematics learning based on the ethnomathematics in Bengkulu to improve students’ cognitive level W Widada, D Herawaty, L A N M T Journal of Physics: Conference Series 1088 (1), 1-8 , 2018 2018 Citations: 188
Pengaruh pembelajaran matematika realistik berbasis etnomatematika terhadap kemampuan pemahaman konsep matematika siswa SMA Kota Bengkulu P Febriani, W Widada, D Herawaty Jurnal Pendidikan Matematika Raflesia 4 (2), 120-135 , 2019 2019 Citations: 171
Ethnomathematics and outdoor learning to improve problem solving ability W Widada, D Herawaty, AFD Anggoro, A Yudha, MK Hayati International Conference on Educational Sciences and Teacher Profession … , 2022 2022 Citations: 112
Students’ metacognition on mathematical problem solving through ethnomathematics in Rejang Lebong, Indonesia D Herawaty, W Widada, T Novita, L Waroka, L A N M T Journal of Physics: Conference Series 1088 (1), 1-6 , 2018 2018 Citations: 104
Analysis of Teacher Performance to Build Student Interest and Motivation towards Mathematics Achievement. H Tambunan, B Sinaga, W Widada International Journal of Evaluation and Research in Education 10 (1), 42-47 , 2022 2022 Citations: 87
Gamification for teaching the Arabic language to non-native speakers: a systematic literature review SA Almelhes, W Widada Frontiers in Education 9, 1-13 , 2024 2024 Citations: 85
Eksplorasi etnomatematika pada masjid jamik kota Bengkulu D Lusiana, NH Afriani, H Ardy, W Widada Jurnal Pendidikan Matematika Raflesia 4 (2), 164-176 , 2019 2019 Citations: 81
The improvement of the understanding of mathematical concepts through the implementation of realistic mathematics learning and ethnomathematics D Herawaty, W Widada, KUZ Nugroho, AFD Anggoro International Conference on Educational Sciences and Teacher Profession … , 2019 2019 Citations: 67
The tools of mathematics learning based on realistic mathematics education approach in elementary school to improve math abilities N Syafriafdi, A Fauzan, IM Arnawa, S Anwar, W Widada Univers. J. Educ. Res. 7 (7), 1532-1536 , 2022 2022 Citations: 63
Metakognisi siswa dalam pemecahan masalah matematika siswa SMA dalam pembelajaran matematika berorientasi etnomatematika Rejang Lebong T Novita, W Widada, S Haji Jurnal Pendidikan Matematika Raflesia 3 (1), 41-54 , 2018 2018 Citations: 61
The ability of mathematical representation through realistic mathematics learning based on ethnomathematics W Widada, KUZ Nugroho, WP Sari, GA Pambudi Journal of Physics: Conference Series 1318 (1), 012073 , 2022 2022 Citations: 58
The Ability To Solve Mathematical Problems Through Youtube Based Ethnomathematics Learning KU Zaid Nugroho, W Widada, D Zamzaili, Herawaty International Journal of Scientific & Technology Research 8 (10), 1432-1440 , 2022 2022 Citations: 55
Augmented Reality assisted by GeoGebra 3-D for geometry learning W Widada, D Herawaty, KUZ Nugroho, AFD Anggoro Journal of Physics: Conference Series 1731 (1), 012034 , 2021 2021 Citations: 54
Understanding the number concepts through learning Connected Mathematics (CM): A local cultural approach D Andriani, W Widada, D Herawaty, H Ardy, KUZ Nugroho, N Ma’rifah, ... Universal Journal of Educational Research 8 (3), 1055-1061 , 2020 2020 Citations: 54
The ability to solve mathematical problems through realistic mathematics learning based on ethnomathematics A Lubis, W Widada, D Herawaty, KUZ Nugroho, AFD Anggoro Journal of Physics: Conference Series 1731 (1), 012050 , 2022 2022 Citations: 52
Students’ ability to simplify the concept of function through realistic mathematics learning with the ethnomathematics approach D Herawaty, W Widada, A Adhitya, RDW Sari, L Novianita, AFD Anggoro Journal of Physics: Conference Series 1470 (1), 012031 , 2022 2022 Citations: 51
The Influence of Contextual Learning Models and the Cognitive Conflict to Understand Mathematical Concepts and Problems Solving Abilities D Herawaty, W Widada First International Conference on Science, Mathematics, and Education … , 2022 2022 Citations: 51
Profile of cognitive structure of students in understanding the concept of real analysis W Widada Infinity Journal 5 (2), 83-98 , 2016 2016 Citations: 46
Proses pencapaian konsep matematika dengan memanfaatkan media pembelajaran kontekstual W Widada J. Penelit. Pendidik. Mat. dan Sains 22 (1), 31-44 , 2015 2015 Citations: 44
The ability to Understanding of the Concept of Derivative Functions for Inter-Level Students During Ethnomathematics Learning W Widada, D Herawaty, KUZ Nugroho, AFD Anggoro Journal of Physics: Conference Series 1179 (1), 012056 , 2022 2022 Citations: 43
