Authors:Flavia Aurelia Hidajat Pages: 113 - 122 Abstract: Dispersive thinking is a process of expanding knowledge through reflective thinking, followed by creative thinking and producing various alternative solutions / answers that are unique, new, and appropriate. This research aims to describe students' dispersive thinking processes in constructing their self-regulated learning in a "Conceptual Embodied" world. Data collection methods are non-routine tests (problems) related to flat shapes, interviews, and think out loud. The results showed that students' dispersive thinking processes in constructing self-regulated learning in the "Conceptual Embodied" world consisted of the following stages: experiencing confusion (presence of experience), identifying problems, synthesizing ideas, building ideas, implementing ideas. The researcher recommends that the construction of a flat concept in the "Conceptual Embodied" world should focus on the development of the students' dispersive thinking stages. PubDate: 2021-07-05 DOI: 10.24042/djm.v4i2.6949 Issue No:Vol. 4, No. 2 (2021)

Authors:Afifah Farhanah Akadji, Muhammad Rifai Katili, Salmun K. Nasib, Nisky Imansyah Yahya Pages: 123 - 132 Abstract: A graph is said rainbow connected if no path has more than one vertices of the same color inside. The minimum number of colors required to make a graph to be rainbow vertex-connected is called rainbow vertex connection-number and denoted by rvc(G) . Meanwhile, the minimum number of colors required to make a graph to be strongly rainbow vertex-connected is called strong rainbow vertex connection-number and denoted by srvc(G). Suppose there is a simple, limited, and finite graph G. Thus, G=(V(G),E(G)) with the determination of k-coloring c:V(G)->{1,2,...,k} . The reaserch aims at determining rainbow vertex connection-number and strong rainbow vertex connection-number on slinky graphs (Sl_nC_4). Moreover, the research method applies a literature study with the following procedures; drawing slinky graphs (Sl_nC_4), looking for patterns of rainbow vertex connection-number, and strong rainbow vertex connection-number on slinky graphs (Sl_nC_4), then proving the theorems obtained from the previous pattern. It is obtained rvc(Sl_nC_4)=2n-1, srvc(Sl_2C_4)=4, and srvc(Sl_nC_4) = 3n-3 for n>= 3. PubDate: 2021-07-05 DOI: 10.24042/djm.v4i2.7276 Issue No:Vol. 4, No. 2 (2021)

Authors:Atika Faradilla, Aang Nuryaman, Asmiati Asmiati, Dewi Rakhmatia Nur Pages: 133 - 144 Abstract: The variational homotopy perturbation method is developed by combining variational iteration method and homotopy perturbation method. Variational iteration method has an efficient process in solving a wide variety of equations and systems of equations. Meanwhile, homotopy perturbation method yields a very rapid convergence of the solution series in most cases. The developed method, variational homotopy perturbation method, took full advantage of both methods. In this study, we described an application of the variational homotopy perturbation method to solve systems of homogeneous partial differential equations. Here we consider some initial value problems of homogeneous partial differential equation systems with two and three variables. The results show that the obtained solution using this method was in agreement with the solution using the homotopy analysis method and variational iteration method, which prove the validity of the variational homotopy perturbation method when applied to systems of partial differential equations. PubDate: 2021-07-05 DOI: 10.24042/djm.v4i2.7825 Issue No:Vol. 4, No. 2 (2021)

Authors:Nur Fitri Yani, Benny Hendriana Pages: 145 - 148 Abstract: This research was conducted with the aim of describing metacognitive skills with students' mathematical generalization abilities in problem solving. This type of research is a qualitative descriptive research. This research was conducted on 9th grade students by taking 5 students as research subjects. Data collection techniques used in this research were tests, interviews, and questionnaires. The results of this research indicate that students are able to apply the designs that they will use to solve problems. Even though the evaluation indicators only review the results obtained. PubDate: 2021-07-05 DOI: 10.24042/djm.v4i2.9249 Issue No:Vol. 4, No. 2 (2021)

Authors:Yasna Kartika Putri, Latifah Mustofa Lestyanto Pages: 149 - 164 Abstract: During the implementation of online learning caused by the Covid-19 pandemic, there are some obstacles that occurred in the class. Almost 40% of students in observation class felt bored and spent more time doing assignments during online learning. Hence, to stimulate the activeness of students it is needed to develop website-based electronic teaching materials on central tendency material which has valid, practice, and effective criteria and can support online learning. The development model used is the 3-stage Plomp Model, namely (1) preliminary research, (2) development or prototyping phase, (3) assessment phase. The subjects of this study are 30 students in the 8H class of Junior High School 8 Malang. The results of the validation test show that the product is valid based on the validation sheet by an expert validator and a practitioner validator which get an average score of 3.9. The results of the practicality test show that the product is practically based on the teacher's and the student's response questionnaire sheets which get an average score of 3.67. Besides, about 79% of students agreed that the product is interesting. The effectiveness test shows that the product is effective since 86.7% of students met the minimum KKM score in the evaluation test. So, it could be concluded that the product developed can be used to support online learning. PubDate: 2021-07-05 DOI: 10.24042/djm.v4i2.8787 Issue No:Vol. 4, No. 2 (2021)

Authors:Millah Kamalia, Ishaq Nuriadin Pages: 165 - 176 Abstract: This research aims to analyze and describe students' mathematical reflective thinking abilities during online learning in terms of self-regulated learning during the COVID-19 pandemic. The method used is qualitative descriptive. The purposive sampling technique was used to select 3 samples consisting of 1 subject having high self-regulated learning, 1 subject having moderate self-regulated learning, and 1 subject having low self-regulated learning. The instrument in this research used a mathematical reflective thinking ability test and self-regulated learning questionnaires. Data analysis in this research uses the Miles and Huberman model, namely data reduction and categorization, data presentation, drawing conclusion, or verification. The triangulation technique is carried out by comparing the results of the mathematical reflective thinking test with interviews to verify the validity of the data. The conclusion of this research is that subject who have high self-regulated learning is quite reflective, the subject who have moderate self-regulated learning is quite reflective, and the subject who have low self-regulated learning is less reflective. PubDate: 2021-07-08 DOI: 10.24042/djm.v4i2.9375 Issue No:Vol. 4, No. 2 (2021)

Authors:Jihan Fitri Isnaini, Ervin Azhar Pages: 177 - 184 Abstract: This research aims to determine whether there is a relationship between YouTube social media and student learning independence. This research was conducted through a quantitative approach using ex-post facto research methods. The sampling technique used was cluster random sampling. The validity of the instrument was tested using expert judgment and empirical test using Product Moment/Pearson. The instrument was tested using the Cronbach Alpha formula. The data obtained were analyzed using descriptive statistics, prerequisite test analysis, and correlation analysis. Based on theoretical studies and calculations of the two variables, it shows that there is a positive relationship between YouTube social media on student learning independence and the magnitude of the YouTube social media relationship on student learning independence. PubDate: 2021-07-07 DOI: 10.24042/djm.v4i2.9373 Issue No:Vol. 4, No. 2 (2021)

Authors:Tresya Carmela Purba, Notiragayu Notiragayu, Fitriani Fitriani, Dorrah Azis Pages: 185 - 192 Abstract: Transportation problems are one of the particular forms that often appear in linear programs, one of which is the distribution of goods. A transportation method is needed to determine the optimal result, namely, the minimum cost from source to destination with all demand and supply fulfilled. There are several methods, one of which is the Lowest Supply Lowest Cost Method (LSLC) and the Exponential Approach Method (PE). Both methods are made in a MATLAB program, generating a script that calculates the algorithm's time complexity. Using the function notation, the Big-O Algorithm complexity of the Lowest Supply Lowest Cost method is more efficient than the Exponential Approach Method algorithm. At the same time, the optimal result for the minimum cost between the two methods is obtained by using the Exponential Approach Method. PubDate: 2021-07-18 DOI: 10.24042/djm.v4i2.9179 Issue No:Vol. 4, No. 2 (2021)

Authors:Zhurwahayati Putri, Sugiyarto Sugiyarto, Salafudin Salafudin Pages: 193 - 202 Abstract: Fuzzy Naive Bayes Classifier method has been widely applied for classification. The Fuzzy Naive Bayes method which consists of a combination of two methods including fuzzy logic and Naive Bayes is used to create a new system that is expected to be better. This research aim to find out the society's sentiments about COVID-19 in Indonesia and the use of the results of the Fuzzy Naive Bayes Classifier. The data of this research is obtained by scraping on Twitter in the period from January 1, 2020 to April 30, 2020. The classification method used in this research is the Fuzzy Naive Bayes Classifier method by applying the fuzzy membership function. In this research, sentiment analysis uses input data whose source is taken from tweets and the output data consists of sentiment data which is classified into three classes, namely positive class, negative class, and neutral class. In the distribution of training and testing data of 70%: 30%, the accuracy of the classification model using the confusion matrix is 83.1% based on 1199 tweet data consisting of 360 testing data and 839 training data. Also the presentation of each sentiment class was obtained which was dominated by positive sentiments, namely the positive class by 36.7%, the negative class by 35.0%, and the neutral class by 28.3%. Based on the results of the presentation, it can be concluded that there are still many people who have positive opinions or give positive responses to the presence of COVID-19 in Indonesia. PubDate: 2021-07-30 DOI: 10.24042/djm.v4i2.7390 Issue No:Vol. 4, No. 2 (2021)

Authors:Sitti Mania, Nazurah Jamaluddin, Andi Kusumayanti, Fitriani Nur Pages: 203 - 216 Abstract: This research is a research and development that aims to develop and assess the quality of student worksheets (LKPD) using ethnomathematics-based prediction, observation, and explanation (POE) learning models to improve students' mathematical critical thinking abilities that are valid, practical, and effective. This research is a development research that refers to the ADDIE development model, namely, analysis, design, development, implementation, and evaluation. In this research, the test subjects were students of class VIII G MTs Al-Urwatul Wutsqaa Sidrap Regency with 26 students. Based on the results of the trials that have been carried out, it is found that (a) The validation of LKPD and other instruments are 3.78 in the "very valid" category, (b) Practical based on the average percentage for the implementation of LKPD has 1.93 of average with the implemented category. Overall, the percentage of the average student response is 93.75% with a very positive category, and the average teacher response is 100% with a very positive category. Thus, the developed LKPD meets practical criteria. (c) Effective because the average percentage of students’ activity is 84.13% with the very good category, the average ability to manage learning is 4.1 in the good category. The average percentage of student learning outcomes tests on critical thinking abilities is 78.6. Therefore, it could be said that students' critical thinking abilities used LKPD is good. It can be concluded that the trial phase which was carried out using the ethnomathematics-based student worksheet of POE learning models to improve students' critical mathematical abilities had met the criteria of validity, practicality and effectiveness. PubDate: 2021-07-31 DOI: 10.24042/djm.v4i2.8306 Issue No:Vol. 4, No. 2 (2021)

Authors:Sunisa Lutfi, Rahma Faelasofi Sunanto, Nihayati Nihayati Pages: 217 - 224 Abstract: The problem in this research is the low student learning outcomes that are thought to be due to the use of teaching methods, where teachers still dominate the teaching and learning process. Sampling was done by using the cluster random sampling technique. The research instrument used was a test consisting of 5 items in the form of a description. The data analysis technique used the t-test because the population research data were normally distributed and homogeneous. The difference in the average of mathematics learning outcomes of students between the experimental class and the control class is shown by the results and the average of mathematics learning outcomes of students in the experimental class is 77.93 higher than the average mathematics learning outcomes of students in the control class 55.72 which means that there is the influence of the Wahdah method on mathematics learning outcomes of 22.21. PubDate: 2021-07-31 DOI: 10.24042/djm.v4i2.8868 Issue No:Vol. 4, No. 2 (2021)