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INDONESIA
Desimal: Jurnal Matematika
Published by Universitas Islam Negeri Raden Intan Lampung
ISSN : 26139073     EISSN : 26139081     DOI : -
Core Subject : Education, Social,
Education Mathematics Social Sciences
Desimal: Jurnal Matematika, particularly focuses on the main issues in the development of the sciences of mathematics education, mathematics education, and applied mathematics. Desimal: Jurnal Matematika published three times a year, the period from January to April, May to Augustus, and September to December. This publication is available online via open access.
Arjuna Subject : -
Articles 310 Documents
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PMRI-based e-module development on sequences and series materials Sari, Resti Auvita; Misdalina, Misdalina; Kesumawati, Nila
Desimal: Jurnal Matematika Vol. 4 No. 3 (2021): Desimal: Jurnal Matematika
Publisher : Universitas Islam Negeri Raden Intan Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24042/djm.v4i3.9545

Abstract

This research aims to produce e-module products based on Indonesian Realistic Mathematics Education (PMRI) on sequences and series materials that are valid, practical, and have potential effects. This research is a type of research and development using the ADDIE model, namely analyze, design, development, implementation, evaluation. The object of research is the quality of PMRI-based e-modules on sequence and series material. Before being tested, the e-module was validated by material experts and media experts. In addition, there is also a student response questionnaire regarding the developed e-module and test questions. The validity of the e-module has an average score of 92%, which is determined based on the results of the assessment of the e-module by experts consisting of 2 lecturers and 1 mathematics teacher. The practicality of the e-module has an average score of 87%, which is determined based on the student response questionnaire to the e-module. The potential effect aspect has an average score of 87% obtained based on student learning outcomes tests. The results of expert validation, student response questionnaires, and tests show that the e-module developed is very valid, very practical, and has a very high potential effect. Overall, PMRI-based e-modules on the sequences and series material for SMA class XI are suitable for use in learning.
Markov average-based weighted fuzzy time series model to predict PT Kimia farma Tbk stock price Azzahra, Rediva; Firdaniza, Firdaniza; Gusriani, Nurul
Desimal: Jurnal Matematika Vol. 4 No. 3 (2021): Desimal: Jurnal Matematika
Publisher : Universitas Islam Negeri Raden Intan Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24042/djm.v4i3.9675

Abstract

The COVID-19 pandemic impacted various activities in Indonesia, including the stock market. Despite the declining economic condition, people are increasingly interested in investing. Among other companies available on the Indonesia Stock Exchange, companies in the health sector have a particular appeal to potential investors, one of which is pharmaceutical companies. This research used a Markov Average-Based Weighted Fuzzy Time Series model applied to PT Kimia Farma Tbk stock price data. This model develops the previous Markov chain–Fuzzy Time Series model, which has not calculated the weights for recurring events and used the Sturgess rule to determine the interval length. In this research, each recurring event has given a different weight that provides different probability values for transitions from one state to another. The Average-Based method is used to determine the interval length that can reflect the fluctuation of the data used. The stock price prediction of PT Kimia Farma Tbk using this model is categorized as very accurate with a MAPE of 2.632%.
Development of mathematics learning video based on Palembang local wisdom about prism materials Pitriani, Pitriani
Desimal: Jurnal Matematika Vol. 5 No. 1 (2022): Desimal: Jurnal Matematika
Publisher : Universitas Islam Negeri Raden Intan Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24042/djm.v5i1.9735

Abstract

The Palembang local wisdom-based mathematics learning video is a tangible manifestation of the nation's character building through education. The developed video discusses the prism materials for eighth-graders. The video was developed through development research by adopting the ADDIE design into ADD (analysis – design – development). The purpose of the study was to examine the feasibility of learning mathematics videos based on local wisdom from experts’ judgment on material, media, and language. The research instruments were a questionnaire and a suggestion sheet. Assessment of prototype 1 showed that the video is “Feasible Enough” but needs to be improved. After revisions are made, the video is called Prototype 2. The expert’s assessment of Prototype 2 showed that the video is "Feasible" and without revision. This video is an alternative learning media (on online or offline learning, even hybrid learning). However, the potential effect remains to be seen. So, this can be a space for other researchers to continue or develop into other materials.
Student team achievement divisions (STAD) and jigsaw learning in terms of numerical abilities: The effect on students' mathematics learning outcomes Sa'adiah, Halimatus; Syaiful, Syaiful; Hariyadi, Bambang; Yudistira, Pengki
Desimal: Jurnal Matematika Vol. 4 No. 3 (2021): Desimal: Jurnal Matematika
Publisher : Universitas Islam Negeri Raden Intan Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24042/djm.v4i3.9746

Abstract

The learning process is inseparable from the strategies and learning models used. The application of the learning model is an effort to improve student's abilities and learning outcomes. This research aims to determine the effect of the STAD and Jigsaw cooperative learning models in terms of numerical abilities on learning outcomes. Data collection was carried out using a test instrument to see students' mathematics learning outcomes. Data analysis is carried out by using a two-way ANOVA statistical test and further testing using the Tukey test. Based on the results of the research, it can be concluded that there is a significant effect between the STAD type cooperative learning model in terms of numerical abilities on mathematics learning outcomes, but for the Jigsaw model there is no effect of the learning model in terms of numerical abilities on mathematics learning outcomes and there is no difference between classes that using the STAD model with a class that uses the JIGSAW model in terms of numerical abilities on students' mathematics learning outcomes.
Analysis of concept construction errors in mathematical problem solving based on the assimilation and accommodation framework in terms of student learning styles Putri, Yeni; Huda, Nizlel; Yantoro, Yantoro
Desimal: Jurnal Matematika Vol. 4 No. 3 (2021): Desimal: Jurnal Matematika
Publisher : Universitas Islam Negeri Raden Intan Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24042/djm.v4i3.9752

Abstract

The forms of concept construction errors are divided into 4 forms, namely (1) Pseudo Construction, (2) Construction Holes, (3) Mis Analogical Construction, (4) Mis Logical Construction. This research aims to determine the process of concept construction errors in solving mathematical problems based on the assimilation and accommodation framework in terms of student learning styles. This research is qualitative descriptive research. The results showed that 1) students with visual learning styles experienced True Pseudo Construction, False Pseudo Construction, and Construction Pits. 2) Students with auditory learning styles experience True Pseudo Construction, False Pseudo Construction as well as Construction Pits and Mis Logical Construction. 3) Students with kinesthetic learning styles experience Construction Pits, True Pseudo Construction, False Pseudo Construction, and Mis Logical Construction. Concept construction errors in the material of a System of Linear Equations with Three Variables that are often experienced by students are Construction Pits caused by students' spontaneous thinking, irregularity of students' knowledge from previous knowledge concepts with new knowledge concepts.
Student worksheets (LKPD) using a scientific approach: the impact on critical thinking skills in linear equation system material Lovyantika, Christin; Marzal, Jefri; Haryanto, Haryanto
Desimal: Jurnal Matematika Vol. 4 No. 3 (2021): Desimal: Jurnal Matematika
Publisher : Universitas Islam Negeri Raden Intan Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24042/djm.v4i3.9800

Abstract

The LKPD development process with a scientific approach uses the ADDIE model which consists of several stages, the first is analysis, namely analyzing the curriculum, validating work gaps, analyzing student needs and characteristics, the second stage is development, namely small group trials and large group trials. The third stage is implementation is by applying the LKPD that has been tested and the last stage is an evaluation which conducts an assessment of the comments of teachers and students on the developed LKPD. The purpose of this development research is to determine the effectiveness of mathematics LKPD with a scientific approach on SPTLT material. The effectiveness obtained based on the developed product can improve students' critical thinking skills from the results of the pretest and posttest which were tested with the N-gain test. After being analyzed by the N-gain test, a score of 0.73 is obtained, namely in the high category and the LKPD developed is effective. LKPD with this scientific approach can improve students' critical thinking skills very well.
Optimization of distribution routes in resolving traveling salesman problems using the tabu search algorithm (case study: CV. Bintang anugerah sukses pekanbaru) Basriati, Sri; Safitri, Elfira; Anggraini, Resi
Desimal: Jurnal Matematika Vol. 4 No. 3 (2021): Desimal: Jurnal Matematika
Publisher : Universitas Islam Negeri Raden Intan Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24042/djm.v4i3.9811

Abstract

CV. Bintang Anugerah Sukses is a company engaged in the distribution of product PT. Belfoods Indonesia. Distribution of frozen goods distributes to 12 customer agencies using one vehicle. The route distribution is determined based on the experience and subjective decisions of a salesman in charge of distributing goods. The problem will be solved using the Travelling Salesman Problem (TSP) approach, so the best route for distributing goods can be obtained that can minimum mileage and time. One of the methods applied to the traveling salesman problem is the Tabu Search algorithm. Tabu Search is one of the metaheuristic methods with the process of searching moving from one solution to the next. The algorithm uses a taboo list to store a set of solutions that have just been evaluated, the result will be adjusted first to the contents of the taboo list to see whether the solution already exists or not. If the solution already exists then the solution will not be evaluated. The calculation results obtained a minimum mileage of 53.6 km and a minimum of time 305 minutes or 5 hours 5 minutes.
Numerical analysis of blood flow in abdominal aortic aneurysm using finite volume method Fatahillah, Arif; Anggraini, Azza Liarista; Setiawani, Susi
Desimal: Jurnal Matematika Vol. 5 No. 2 (2022): Desimal: Jurnal Matematika
Publisher : Universitas Islam Negeri Raden Intan Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24042/djm.v5i2.9928

Abstract

There is a deadly cardiovascular disease that can cause swelling of the Abdominal Aorta. This disease is known as Abdominal Aortic Aneurysm (AAA). AAA is believed to be a degenerative process caused by genetic factors, gender, body weight, and age. Changes in collagen and elastin in the aortic wall are the cause of the degeneration process. Therefore, it will cause dilatation of the aortic wall. Swelling of the aortic blood vessels will affect the blood flow velocity in the aortic blood vessels. This research aims to analyze the velocity of blood flow in the Abdominal Aortic Aneurysm based on swelling diameter, proximal neck length, and aneurysm channel length using Computational Fluids Dynamics (CFD). The blood flow velocity was modeled using mathematical language based on mass continuity equations and momentum equations.  Then the finite volume method was one method to solve the mathematical model. MATLAB and ANSYS FLUENT software were used to simulate the velocity of blood flow analysis. The results of the research were shown that the larger the diameter and swelling channel length, the smaller the velocity of blood flow produced. Then, the greater the length of the proximal neck, the faster the resulting blood flow will be.
Eigenvalue decomposition of a symmetric matrix over the symmetrized max-plus algebra Suroto, Suroto
Desimal: Jurnal Matematika Vol. 4 No. 3 (2021): Desimal: Jurnal Matematika
Publisher : Universitas Islam Negeri Raden Intan Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24042/djm.v4i3.9959

Abstract

This paper discusses topics in the symmetrized max-plus algebra. In this study, it will be shown the existence of eigenvalue decomposition of a symmetric matrix over symmetrized max-plus algebra. Eigenvalue decomposition is shown by using a function that corresponds to the symmetrized max-plus algebra with conventional algebra. The result obtained is the existence of eigenvalue decomposition of a symmetric matrix over symmetrized max-plus algebra and its application to determine eigenvalues and eigenvectors.
The development of learning video media on sequence and series materials Kamalia, Kamalia; Lusiana, Lusiana; Destiniar, Destiniar
Desimal: Jurnal Matematika Vol. 5 No. 1 (2022): Desimal: Jurnal Matematika
Publisher : Universitas Islam Negeri Raden Intan Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24042/djm.v5i1.9973

Abstract

This research aims to produce a video media product for learning the material of sequences and series for class XI students that is valid, practical, and has potential effects. The method used in this research is the research and development method with the ADDIE development procedure, which consists of five stages, namely: 1) Analysis, 2) Design, 3) Development, 4) Implementation, and 5) Evaluation. The instruments used to obtain research data are in the form of expert validation questionnaires, student response questionnaires, and test sheets. The results of the assessment from the experts obtained a percentage score of 84.81% so that the learning video was declared "Valid". The results of the student response questionnaire obtained a percentage score of 92.70% with the "Very Practical" category. Student test results after using the learning video obtained a percentage of learning completeness of 81.25% with the criteria "Very High" so that the learning video is declared to have a potential effect and is suitable for use in the learning process.

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