bluuebunny/crossref_metadata_2025_split huggingface dataset:
Exploration of self-regulated learning: Mathematical problem solving
Authors: Nugroho A A , Dwijayanti I , Utami R E 
Published: April 2021

Abstract
Self-regulated learning is needed to regulate and direct itself, adjust, and control self-learning. This study aims to get an overview of students’ self-regulated learning in solving junior high school mathematics problems. This research is a qualitative descriptive study with three research subjects. The data collection techniques used math ability tests, problem-solving tests, self-regulated learning questionnaires, and interview guidelines. The results showed the profile of self-regulated learning raised by junior high school students when solving math problems, especially problems related to SPLDV, namely: 1) Planning, thinking and activation stages: (understanding the problem is expressed in using one’s own language or the language of the problem and there is an estimate of SPLDV completion through arithmetic procedures, logic and elimination substitution methods; 2) Monitoring Stage: monitoring is carried out on the correctness of the variables with or without involving the whole conversation; 3) Control stage: answer checking with reverse technique; and 4) Reaction and Reflection Stage: Explore the difficulties faced related to routine and non-routine problems.
Covid-19 sir model with nonlinear incidence rate
Authors: Fayeldi T , Dinnullah R N I 
Published: April 2021

AbstractCovid-19 is part of worldwide pandemic since early 2020. Various mathematical models have been proposed to understand the behaviour of the disease, but most of them were failed to predict the biological phenomenon of this infectious diseases since they use incorrect assumptions due to early stage symptoms. The aim of this paper is to develop a covid-19 mathematical model with nonlinear incidence rate. We use some logical assumption to develop the model. We discretize the model by using Euler method. We use literature review in our research methodology. Then, we simulate the model by using computer software. We found that this model has two equilibrium points, namely disease free equilibrium point and endemic equilibrium point. The stability of the model is changed by increament or decreament of the step-size. If the step-size of the model is large enough, then it lead numerical solution to blown up. Finally, we also found that this model is fair enough to simulate the pandemic in our case. Also, we found some interesting phenomenon from our simulation that is the effect of government policies or social distancing. Further work is needed to analyze the stability of the model and the effect of delay.
The effectiveness of using magic book Math in Mathematics learning during the Covid-19 pandemic in Senior High School
Authors: Buchori A , Prasetyowati D , Wijayanto W 
Published: April 2021

Abstract
This study aims to find out the effectiveness of using augmented reality-based magic book math at State Senior High School 15 Semarang on student achievement. The type of research used was Quasy Experimental research. The population of this study was X grade students of State Senior High School 15 Semarang. With random sampling technique, two classes were selected, X grade of IPA 4 as the experimental class and X grade of IPA 2 as the control class. Data processing with t comparative test and regression effect test. The results showed that learning was said to be effective which was indicated by: a) the average value of learning achievement in the experimental class was 89.57 which exceeded the Passing Grade 70 limit; b) the effect of student responses can be seen from the value of R square = 0.882 which means 88.2% of student achievement was influenced by student response factors in learning using magic book math based on augmented reality; and c) the average learning achievement of the experimental class was 89.57 while the control class was 70.84, so the experimental class had a significantly better final score average than the control class average.
Misconceptions of prospective Mathematics teacher on graphing function
Authors: Syarifuddin A , Sari A F 
Published: April 2021

Abstract
Good learning outcomes supported by a good understanding of concepts. A good understanding of the concept is an understanding that do not contain misconceptions. This study aims to identify the misconceptions of prospective mathematics teacher on graphing function. This research was conducted on 8 undergraduate students. This study used a descriptive research design. Descriptive research is used to analyse conceptual understanding and student misconceptions based on test results using diagnostic test instruments and interview results. The questions used were 5 questions that had been validated by 2 mathematics lecturers with valid results. The results showed that most of the students were still doing plotting without identify of the domain dan characteristics of the function. Some of them were also still stuck with using integers as the reference.
Augmentation time series model with Kalman filter to predict foreign tourist arrivals in East Java
Authors: Purnaningrum E , Cahyaningtias S , Kusumawardhani D A 
Published: April 2021

AbstractOne of the focuses of Indonesia’s development is on the tourism sector. In addition, one of the supporters of the sector’s sustainability is the customer. So, customer satisfaction who comes and their desire to come back again, as well as an indirect promotion to other potential visitors. The availability and convenience of infrastructure and facilities are important to support this. In other words, the prediction of visiting foreign tourists is one form of alertness in preparing future tourism projections. However, the fluctuation of data for foreign tourists affects the effectiveness of the model in making predictions. Kalman filter is a stochastic deterministic model that can solve this problem. This study combines the time series model with the Kalman filter to determine the prediction of the number of foreign tourists visiting East Java. The results of these predictions can be concluded that the Kalman filter is able to handle fluctuating data with RMSE close to 0. The prediction for this paper could be help enterprise to decide future plan for give the tourist discount.
Geometry material: Profile of creative thinking process of prospective teachers with reflector learning style in proposing and solving problems
Authors: Ferdiani R D , Manuharawati M , Khabibah S 
Published: April 2021

Abstract
The purpose of this study was to describe the creative thinking process of students in reflector learning style in proposing and solving review problems from the Wallas stage. This research is a qualitative research. The subjects of this study were students of semester VII of the Mathematics Education Study Program of the University of Kanjuruhan Malang with the following criteria: a) age between 18-25 years, b) of the same gender, c) At least getting a B grade for the course of School Mathematics Development Studies. Researchers in this study acted as the main instrument and the supporting instruments used were Honey and Mumford’s Learning Style Questionnaire (LSQ) questionnaire, test sheets, and interview guides. Questionnaires will be given to research subjects, and subjects with reflector learning styles will be selected. Based on the researchers’ observations, it can be concluded that aperson with a reflector learning style will tend to prefer to observe, be careful in making decisions that will be seen at every stage of his creative thinking process.
Technology of Holobox Augmented Reality Grebeg Pancasila rite for Mathematics learning in Elementary School
Authors: Septinaningrum S , Hakam K A , Setiawan W , Agustin M , Sopandi W , Surur A S 
Published: April 2021

Abstract
The use of technology in learning needs to be encouraged starting from the elementary school level. Another thing that needs to be encouraged is local wisdom-based media to support character learning. This study aims to develop holobox augmented reality technology media of local wisdom of the Grebeg Pancasila rite for mathematics learning in elementary schools. This research produces multimedia based on technology Holobox Augmented Reality (AR) with the content of material Grebeg Pancasila for learning mathematics and building spaces in elementary schools. The method in media development using the Development Life Cycle developed by Luther consists of six stages, namely: concept, design, material collection, assembly, testing, and distribution. The media produced meets the standard of feasibility and can provide information and knowledge about understanding the concept of flat and space structures through the flag and gunungan symbols in the Rite Grebeg Pancasila. The implication of this study is that cultural diversity in local wisdom of the Rite Grebeg Pancasila can be used as a medium for learning mathematics in elementary schools (MI/SD) through Technology Holobox. Augmented Reality.
Analysis of mathematical problem-posing ability
Authors: Isrokatun I , Haryani C S , Rahmi N I 
Published: April 2021

Abstract
Problem-posing is the ability of students to raise the problem. Problem-posing ability is important, owned by students in mathematics. It is because integrative mathematics learning students need to do scientific activities. The scientific activities comprise observing, questioning, gathering information and communicating. By having problem-posing abilities, expected students to motivate to overcome the problems raised themselves. The purpose of this research analyze problem-posing ability in mathematics in third-grade students at the elementary school levels. The method used qualitative research using descriptive analysis. Here, problem-posing ability in third-grade students in mathematic is still low. It proved this by tests conducted in two elementary schools in Sumedang and got 37.7 and 42.5 scores. Based on the analysis of students’ answers, there are some difficulties experienced by students, namely unable to answer what they know, they cannot find the most important problems, they could not overcome the initial problems, and make questions. The indicators in problem-posing interrelated, that is looking for most important problem by making questions. It is because students will make questions based on the important information which they have already known. With this research, the teacher can easily determine the teaching method by the teacher to improve students’ problem-posing abilities.
3D Grapher application: Mathematical spatial ability
Authors: Kusnadi F N , Rachmawati T K , Syaf A H , Sugilar H 
Published: April 2021

Abstract3D Grapher application is a user-friendly application that supports learning to three-dimensional geometry. The purpose of this study was to determine the increase of students’ mathematical spatial ability by using the 3D Grapher application. This study uses quasi-experiment method with a tutorial model conducted on class VIII students one of junior high school in Bandung City. The instruments research by test and the research data were analyzed by t-independenttest. Based on the results of research that improves mathematical spatial ability of students who get 3D Grapher based tutorial learning with an average n-gain score 0,56 better than students who get conventional learning with an average n-gain score 0,44. Thus learning through the 3D Grapher application can be used as an alternative to improve the mathematical spatial abilities.
Mathematical communications through project based learning based on android
Authors: Susilawati W 
Published: April 2021

Abstract
The lack of multimedia applications in schools and the low mathematical communication ability of students, as an alternative to using Android. The purpose of this research is to improve students’ mathematical communication ability through android based learning project. Using the quasi experimental method. This research conducted at Junior High School in Bandung with 55 students as samples, 29 students in class VIII C as an experimental class and 26 students in class VIII D as a control class. Mathematical communication ability test instrument. Data analysis: independent T test, two way ANOVA test. The findings: Improved communication of students who get learning on Android based learning projects was higher than students who get conventional learning. There were no difference in the achievement of mathematical communication between students who get an Android based learning project and conventional learning based on mathematical basic knowledge in the high, medium and low categories. There is the influence of the interaction between the type of project based learning with android applications and expository learning and prior knowledge mathematics category (high, medium, and low) on the ability of students’ mathematical communication. Android based learning project facilitates inventions process, reflective, the material is easy to understanding so that students’ mathematical communication skills increase.
Improving understanding of addition and subtraction concept in first grader through utilization of flipped classroom
Authors: Susilowati T , Rasmita R , Sumantri M S , Martini A 
Published: April 2021

Abstract
This class action research was conducted to see the effectiveness of the flipped classroom method on improving the concept of addition and subtraction. Flipped classroom method was chosen because it is in accordance with the current development of digital learning media that utilizes technology in learning. Flipped classroom performed by providing learning videos that can be viewed online by students at home then followed by problem solving activities through discussion activities in class with mentoring provided by the teacher. Based on this study an increase of 28.6% was obtained so that 83.3% of 42 students scored more than the minimum competencies criteria. The implications of this research can be utilized in other mathematical learning concepts.
Students’ problem solving on mathematical proportion
Authors: Sesanti N Y , Triwahyuningtyas D 
Published: April 2021

Abstract
This study analyzed problem solving abilities of the students on mathematical differential. Descriptive qualitative applied in this study with 26 students of secondary school; 16 males and 11 females. Data analysis reveals the ability of students’ problem solving abilities, namely understanding the problem, drawing up a problem solving plan, implementing the solution and re-checking the solution. The instruments used were test and interview. The findings showed that more than 50% mistake happened on drawing up a problem solving plan and re-checking the solution. So that to reduce the mistake we as lecturer should train the students in mathematical problem solving strategies.
Graphic communication in detecting outlier cases in time column control diagram
Authors: Enjang E , Aliyudin M , Nurdin F S , Laksana M W , Sarbini S 
Published: April 2021

Abstract
Control diagrams are graphical communication media that can be used as tools in the process of controlling statistics statistically to assist in monitoring and improving a quality process by helping to separate specific cause and general cause variables. Basically the control diagram plots the area of acceptance of a hypothesis test. This study aims to detect disruptive causes in the control diagram in time series cases and to justify the statistical model in accordance with the procedure. A process is said to be controlled if the observational data from that process behaves like random iid variables (independent identically distributed), and if it is not controlled, it is out of control. The study uses 25 days’ time series observational data in PT. Guccitex Cimahi. In this time frame analysis, research that is influenced by specific causes can be treated as outliers of the time series model and can be detected by outlier detection methods. The results in this study explain that a traditional control diagram is very dependent on the assumption of iid (independent identically distributed). Application in real life faces observations that are not iid (independent identically distributed), which show the effects of trends, seasonality, and other influences. The control diagram is in principle the same, using time series analysis to overcome these effects by plotting the area of acceptance of a hypothesis test, but if the process is not controlled, the control diagram cannot provide any guidance, so it is necessary to do a data analysis using analysis time series.
Generalized Linear Mixed Models by penalized Lasso in modelling the scores of Indonesian students
Authors: Santi V M , Notodiputro K A , Sartono B , Rahyu W 
Published: April 2021

AbstractThe Generalized linear mixed model (GLMM) is an extension of the generalized linear model by adding random effects to linear predictors to accommodate clustered or over dispersion. Severe computational problems in the GLMM modelling cause its use restricted for only a few predictors. When many predictors are available, the estimators become very unstable. Therefore, the procedure for selecting relevant variables is essential in modelling. The use of penalty techniques for selecting variables in mixed models is still rarely applied. In this article, the penalizedLassoapproach proposed to handle these kinds of problems. The proposed methods select variables and estimate coefficients simultaneously in GLMM. Based on the Akaike Information Criterion (AIC), Bayesian Information Criterion (BIC), and standard error criteria, it was found thatglmmLassohas a better performance than GLMM. For the factors affecting Indonesian’s student scores, whereglmmLassoproduces three significant covariates for the GLMM model while GLMM without penalizedLassohas five covariates, which means that the GLMM model is more complicated thanglmmLasso.Gender, school quality based on National Examination (UN) scores and the opportunity for students to investigate to test their ideas are essential covariates as factors that influence the rating of Indonesian students.
Selection of variables in generalized linear mixed model for smoker in Jambi Province
Authors: Warti R , Notodiputro K A , Sartono B 
Published: April 2021

AbstractSmoking is one of the health problems in Indonesia. Many factors cause a person to smoke, both originating from oneself and the environment. The statistical question that arises is how to choose the factors that are most significant in influencing people to smoke. These factors are the variables that will sed in modeling. This study aims to select the variables in the compressed linear mixed model using the Lasso penalty and the Boosting function, using the EM and REML algorithms. Respondents in this study were 160 smokers in Jambi Province. Based on the AIC value, the best model obtained from the selection of variables with the Boosting function and REML algorithm. The analysis shows that work, welfare level, and family members who smoke are the factors that influence people smoking in Jambi Province.
Experimental review of a travelling-wave thermoacoustic system device
Authors: Kharismawati I , Achmadin W N , Trianggono M M 
Published: April 2021

Abstract
The thermoacoustic travelling wave device system has been designed and we have tested, this thermoacoustic device consists of loud-speakers as a sound wave source with a capacity of 120 W, branched-tubes resonator, and loop-tube resonator that have a regenerator with a length of 8 cm placed inside loop-tube. Regenerator is made of acrylic material which has a size of 1 mm and the distance between pores and other pores also has a distance of 1 mm. The performance of the thermoacoustic travelling wave device is observed from the temperature changes it has and is reflected in how much changes in cold reservoir temperature and hot reservoirs it can achieve. The results of the experiments obtained will be analyzed in the form of temperature charts showing temperatures in hot reservoir and cold reservoir as a function of time. The temperature difference between the two sides of the regenerator reaches 26,3°C with details of the temperature rise of the heat side of the regenerator (Th
) up to δTh
= 13,4°C and the temperature drop of the cold side of the regenerator (Tc
) down to δTc
= 12,9°C.
Identification students’ misconception using four-tier diagnostic test on Newton Law subject
Authors: Sundaygara C , Gusi L A R P , Pratiwi H Y , Ayu H D , Jufriadi A , Hudha M N 
Published: April 2021

Abstract
Misconception is something that causes students fail to understand physics concept intensively. The research aims to identify the students’ misconception on Newton Law concept using four-tier diagnostic test. Method used in the research was descriptive method. Data of students’ misconception was collected using test and interview. The subjects of the research were students of X MIPA 5 in State Senior High 10 Malang in 2019/2020 academic year and they were 32 students. The result of the research shows that the level of students’ misconception of X MIPA 5 in State Senior High 10 Malang is 54% which belongs to medium category. The research found that the misconception which happened to most students was on Newton II Law which is 63%. It also relevead that misconception in students occur because of experiences or events experiences by students in everuday life, students’ initial concepts and teachear teaching methods.
Passively Q-switched erbium-doped fiber laser with graphene oxide film as saturable absorber
Authors: Huda C , Yasin M , Zaidan A H , Harun S W , Jafry A A A , Rosol A H A 
Published: April 2021

Abstract
Passively Q-switched erbium-doped fiber laser (EDFL) have been demonstrated using graphene oxide (GO) film as saturable absorber (SA). The aim of this experiment is to generate and demonstrate passively Q-Switched Erbium-doped fiber laser (EDFL) using GO as a saturable absorber. Stable Q-switched operation can be achieved at 1558.8 nm. By increasing the pump power from 26.32mW to 71.65mW, the repetition rate also increased from 30.58 kHz to 51.81k Hz. The pulse width of the laser were 11.2 – 4.73 µs. The maximum output power and maximum peak power obtained are 128 µW and 521.98 µW respectively at a pump power of 71.65 mW. The pulse energy reaches 2.47nJ. These results show that GO is a new potential SA material for pulsed laser applications.
Physics undergraduate students’ perceptions of online learning during the transition period to the new normal era
Authors: Surahman E , Sujarwanto E 
Published: April 2021

Abstract
The Covid-19 pandemic forced the Indonesian government to release learning from home policy. This policy also applies to the Physics Education of Siliwangi University. This study aims to know undergraduate students’ perceptions of online learning during the transition period from face-to-face learning to online learning in Physics context. Undergraduate students’ perceptions of online learning are seen from aspects of access to technology, technology for learning, online learning readiness, and attitude towards digital technology literacy. The data is collected by an online survey method. This research shows that most undergraduate students have sufficient facilities for online learning and have a positive attitude towards digital technology literacy. Another finding from the study is that the majority of undergraduate students have difficulty accessing the fast internet (83.87%). Undergraduate students like a combination of online media learning and offline media learning (90.32%), but they do not like full online learning (98.06%). This research indicates that teachers should support students at online learning by providing proper Physics learning material and media. This research is expected to suggest better online learning and literacy technology in Physics context in the new normal era.