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Indonesian Journal of Education and Mathematical Science
Published by Universitas Muhammadiyah Sumatera Utara
ISSN : -     EISSN : 2715985X     DOI : https://doi.org/10.30596/ijems
Core Subject : Science, Education,
Computer Science & IT Education Languange, Linguistic, Communication & Media Library & Information Science Mathematics
Indonesian Journal of Education and Mathematic Sains I(JEMS) is a Journal that contains Information on Education and Science. This journal is managed by Muhammadiyah University of North Sumatra (UMSU). This journal is an online journal using OJS system (Open Journal System) which has e-issn from PDII-LIPI. This journal is published 3 times a year ie: Januari - Mei - September
Arjuna Subject : Umum - Umum
Articles 2 Documents
 1 
Search results for , issue "vol 7, no 3 (2026)" : 2 Documents clear
Evaluation of Gaussian Process Regression, Support Vector Regression, and K-Nearest Neighbors for Predicting Concrete Compressive Strength at Various Curing Ages Elmanani Simamora; Abil Mansyur; Muhammad Badzlan Darari; Suvriadi Panggabean; Rizki Habibi
Indonesian Journal of Education and Mathematical Science Vol 7, No 3 (2026)
Publisher : Universitas Muhammadiyah Sumatera Utara (UMSU)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/ijems.v7i3.31258

Abstract

Accurate prediction of concrete compressive strength is critical for quality control, structural evaluation, and mix optimization. However, the connection between mix composition, curing age, and compressive strength is often nonlinear and heterogeneous. This study assesses four prediction models, including Native Gaussian Process Regression, Gaussian Process Regression with Conformal Intervals, Support Vector Regression, and K-Nearest Neighbors, to estimate concrete compressive strength at various curing ages. Predictors are produced from a combination of composition, curing age, and material-important properties. Model performance is evaluated using Leave-One-Age-Out and repeated stratified K-fold by Age, with root mean square error, mean absolute error, coefficient of determination, coverage, and average interval length. The results demonstrate that Native Gaussian Process Regression gives the best steady overall performance in both assessment methodologies. At the same time, Gaussian Process Regression with Conformal Intervals tends to provide higher coverage with the consequence of wider intervals. In general, Native Gaussian Process Regression provides the best balance among point prediction accuracy, interval coverage, and interval efficiency for heterogeneous concrete compressive strength data by curing age.
Enhancing Fifth Graders’ Flat Geometry Problem-Solving Skills through Stem-Based ‘Squid Math’ Gamified Learning Media Yuni Mariyati; Intan Dwi Hastuti; Reny Widya Astuti
Indonesian Journal of Education and Mathematical Science Vol 7, No 3 (2026)
Publisher : Universitas Muhammadiyah Sumatera Utara (UMSU)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/ijems.v7i3.29019

Abstract

This study investigates the effect of implementing the STEM-based “Squid Math” game on fifth-grade students’ problem-solving abilities in plane geometry. The study employed a quasi-experimental method with a nonequivalent control group design. The participants consisted of 15 fifth-grade students from SDN 2 Jerowaru as the experimental group and 23 fifth-grade students from SDN 2 Paremas as the control group. The research instrument used was an essay test that had been tested for validity and reliability. The data were analyzed through normality testing, homogeneity testing, and hypothesis testing using the Independent Samples T-Test with the assistance of SPSS 25. The findings revealed that the experimental group’s mean score increased from 53.67 in the pre-test to 84.17 in the post-test, whereas the control group’s mean score improved from 41.26 to 61.85. The implementation of learning activities reached 100% in the experimental group and 95% in the control group. The hypothesis test produced a significance value of p = 0.000 0.05, indicating a significant difference between the two groups. Therefore, the STEM-based “Squid Math” game media significantly contributed to improving fifth-grade students’ problem-solving skills in plane geometry. This learning media is recommended as an innovative alternative for mathematics instruction in elementary schools.

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