bluuebunny/crossref_metadata_2025 huggingface dataset:
Structural Health Monitoring for Cables with Insulation Layer by Envelope Analysis Based on Ultrasonic Guided Waves
Authors: Yang Xiao , Qu Zhigang , Wang Qiuyu , An Yang
Published: October 2020

Cables play an important role in industries and their insulation layer may experience aging problems, which can lead to serious consequences such as fire. Therefore, monitoring the condition of the cable insulation layer can effectively avoid accidents. In this paper, a structural health monitoring method for cables with insulation layer is proposed, which is based on ultrasonic guided waves (UGWs). In the method the UGWs are generated by MFC transducers and do not affect the normal operation of the cables. When UGWs propagating in the cable encounter defects, the reflected signals appear and can be acquired by the measurement system. The signal received by MFC transducers is processed to extract the characteristics. According to the envelope of received signals, it can be judged whether the current cable insulation is defective. In the experiment, cables in different conditions are tested and defects are successfully detected.
The Grey Forecasting Model for the Medium-and Long-Term Load Forecasting
Authors: Song Feng , Liu Junxu , Zhang Tingting , Guo Jing , Tian Shuran , Xiong Dang
Published: October 2020

Load forecasting plays a particularly significant role in the stable operation of grid and the reasonable distribution of power resources. Based on grey model theory, this paper carries out load forecast of power system. In this paper, the grey model theory is used to realize the medium and long-term load forecasting, and the accuracy of the model to the load forecasting is tested by using the posterior difference method. Finally, an example is given to check the method’s practicability.
Topology design of multi-row series-parallel multi-speed planetary gear automatic transmission based on extended lever method
Authors: Fan Yi
Published: October 2020

With the urgent need of saving energy, reducing emissions, reducing shifting frustration and improving driving quality, the number of gears of automatic transmissions used in automobiles is increasing. However, the traditional lever method is insufficient in designing multi-row parallel-series multi-speed planetary gear automatic transmissions. In this study, an extended lever method is proposed, which can design and analyze the transmission state of planetary gears with multiple input elements, multiple output elements and no fixed elements. Then, based on the extended lever method, a series of multi-speed planetary gear automatic transmissions are designed, among which a twelve-speed planetary gear automatic transmission is selected, and the kinematics and dynamics are analyzed by using the lever method. The results show that the designed twelve-speed transmission has a wide range of speed ratios, with up to seven overdrive gears and a smaller speed ratio interval of each overdrive gear. The results further prove that the extended lever method is an important direction for the design of multi-row series-parallel multi-speed planetary gear automatic transmission.
Experimental analysis of repairing H14 die steel surface by laser cladding
Authors: Xing Wang , Mingming Wu , Jinxia Zhou
Published: October 2020

The damage of die metal parts is one of the key problems that affect its normal use. Laser cladding technology can solve this problem quickly and effectively. In this paper, the tungsten alloy powder was cladding on the metal surface by laser cladding, and the surface repair and strengthening technology were carried out. The influence of laser scanning speed on the microstructure of cladding layer metal was studied. The experimental results show that the metal parts with surface damage are repaired by laser cladding technology, and the cermet protective layer without pores and cracks is obtained. The hardness value of laser cladding layer is greatly improved than that of base material, which lays a good foundation for improving material performance.
Study on pavement performance of basalt fiber asphalt concrete under different pavement environment
Authors: Yan Jingchen , Wang Guilai , Zheng Jianlong
Published: October 2020

In order to study the basalt fiber in the road with the performance, the test of matrix asphalt concrete, basalt fiber reinforced asphalt concrete and the SBS modified asphalt concrete applying ultraviolet aging, high and low temperature alternating cycle change, after the freeze-thaw cycle and salt freezing and thawing cycle road environment for rutting test, low-temperature bending test and immersion Marshall test. The test results show that basalt fiber plays an important role in improving the high-temperature stability, low-temperature crack resistance and water stability of asphalt concrete under different road conditions. The degree of influence of pavement environment on the deterioration of pavement performance of basalt fiber asphalt concrete is as follows: ultraviolet aging > high and low temperature alternating cycle > freeze-thaw cycle > salt freeze-thaw cycle.
Simulating the effects of braced excavation on the adjacent tunnel using numerical method
Authors: Yi Shun , Ke Wenhui , Huang Xiangguo , Xiao Mingzhao , Chen Jian , Huang Juehao
Published: October 2020

It is inevitable that the construction of braced excavation is in the vicinity of existing tunnels. Therefore, it is necessary to assess the influence of braced excavation on the nearby tunnel. Using two-dimensional (2D) numerical method, this study is conducted to investigate the response of existing tunnel induced by overlying excavation. A series of scenarios are carried out, with consideration of relative locations of tunnel with respect to overlying excavation. The results demonstrate that different distortion of the tunnel will occur with the variety of relative locations between the tunnel and the braced excavation. Additionally, the excavation-induced tunnel responses show a decrease trend with an increase distance between the tunnel and excavation. In this regard, the study can provide a useful reference for evaluating the influence of braced excavations on nearby structures.
Determination of Ultimate Load and Stability Evaluation of Transmission Tower Foundation during Operation Period
Authors: Yingbo Zhou , Hang Chen , Qiupeng Zhou , Zhiqiang Duan , Xiaojing Gao
Published: October 2020

500kV transmission tower foundation on the Yanzi landslide is taken as the research object this article. The extreme working conditions of the transmission tower foundation under different operating conditions, including maximum wind speed, icing and disconnection, are determined. Based on this, the stability of the tower foundation, including foundation uplift stability, foundation overturning stability, foundation bearing capacity, is initially evaluated according to the " Code for Design of 110kV ∼ 750kV Overhead Transmission Line " (GB 50545-2010). The results show that when the wind speed is greater than 20m/s, the maximum wind speed is determined as the extreme load condition of the tower foundation. Preliminary evaluation of the stability of the tower foundation shows that its stability is related to the wind speed and the buried depth of the tower foundation. Therefore, the research results can provide technical reference for related power departments.
Primary School Site Selection Research Based on Big Data of Population Density Jintang urban area of Chengdu as an example
Authors: Xiao Hai , Fu Linqin
Published: October 2020

In recent years, big data has been increasingly used in the location of urban public service facilities. This paper takes Jintang urban area of Chengdu as the research object, based on big data of population density, and five factors that affect the site selection of primary schools are studied, including traffic safety, traffic accessibility, existing primary schools, land usage nature, and land price. Spatial analysis methods such as GIS nuclear density analysis are applied to analyze and process related factors. The results show that on the basis of the existing planning and layout of Jintang urban area, the land for education and scientific research on the east side of Jinyuan street, the land for primary and secondary schools on the east side of Jinying road, and the southwest corner of Hantan community are the most suitable plots for primary and secondary schools. Among them, the education and scientific research land on the east side of Jinyuan street serves the most residential sites, which is the optimal plan for site selection for primary schools.
Real-time Insulation Monitoring System for Electric Submersible Pump
Authors: Wang Min , Liu Shenghu , Song Nan , Dang Bo , Ren Zhiping
Published: October 2020

As one of the most important mechanical oil production equipment in the process of oil and gas production, electric submersible pump has a cycle of up to half a year for working. During the operation of the electric submersible pump, the insulation condition of the system will gradually aging, resulting in defects in the system and causing destructive failure. In order to solve this problem, this paper designs a real-time monitoring system for the insulation condition of electric submersible pump, and constructs the indoor well condition simulation experiment. Compared with the existing insulation detection technology, the monitoring technology is simple and does not need professional technical support from inspectors.
2nd International Seminar on Applied Mathematics and Mathematics Education (ISAMME) 2020
Authors: Hendriana H , Hidayat W , Widodo S A , Irfan M , Noto M S , Perbowo K S , Prahmana R C I
Published: October 2020

Preface

Indonesian education system demands changes due to the dynamic challenges in human resources as the effect of the Industrial Revolution 4.0. As a result, the curriculum set into contemporary literacies: Data Literacy comprises the ability to read and analyze, Technology Literacy includes the ability to apply technology, and Human Literacy aims at creating humanists who can communicate well. This new education system requires professionals who create innovation based on research information. This notion calls for a new perspective converting challenges into opportunities. Thus, the Mathematics Education Department of IKIP Siliwangi and the Indonesian Mathematics Educator Society (I-MES) invite researchers, practitioners, and educators to participate in and contribute to The 2nd International Seminar on Applied Mathematics and Mathematics Education (ISAMME) 2020 under the theme “Issues and Challenges for Applied Mathematics and Mathematics Education in Digital Era.”

This seminar has objectives to expand mathematics contribution to society, improve mathematics teaching, and solve mathematics problems. It was carried out online through the Zoom application with a capacity of 1000 people. The Zoom application is also equipped with a Zoom breakout feature to support the implementation of contribution and streaming sessions on Youtube.

List of photos are available in the pdf.
Profile of mathematical representation ability of junior high school students in Indonesia
Authors: Putra B Y G , Rosita N T , Hidayat W
Published: October 2020

This study aims to determine students’ mathematical representation abilities. The research uses descriptive qualitative method. This ability is addressed after the students have answered five validated mathematical representation problems. The research subjects are 35 students of class VIII in one of State Junior High Schools in Bandung, West Java, Indonesia. The state junior high school is included in the medium level category according to the achievement of the National Final Examination score. The results of this study indicate that students still have difficulty in drawing the graph to solve Two-Variable Linear Equations, students have difficulty in making equations or mathematical expression and students have difficulty in solving and drawing conclusion from the problems of Two-Variable Linear Equation System in text.
The effect of STEM approach on the mathematics literacy ability of elementary school teacher education students
Authors: Kelana J B , Wardani D S , Firdaus A R , Altaftazani D H , Rahayu G D S
Published: October 2020

This study aims to determine the effect of the STEM approach on mathematics literacy abilities of elementary school teacher education students. The method used in this research is pre-experimental with One-Group Pretest-Posttest Design with a population of semester 2 PGSD students with a total of 188 students. The sample in this study was 50 students. The instruments used include: mathematics literacy ability tests, interviews, and observation instruments. The results showed that: 1) there was an effect of the STEM approach on the mathematics literacy ability of elementary school teacher education students; 2) to further optimize learning it must be prepared more thoroughly and planned, 3) the role of educators or lecturers in applying models or approaches must be adapted to the demands of 21st-century skills.
The role of education, values, culture and character in online learning for learning mathematical outcomes of prospective teachers
Authors: Fitrianna A Y , Novtiar C
Published: October 2020

The purpose of this research is to know the relationship between education, value, culture and the character of learning outcomes after online learning. The research methods used are correlational. The population taken is the entire student of the Mathematics Education Study Program IKIP Siliwangi 2018 which takes courses of Linear Program. Sample research was taken with the Purposive Sampling technique as many as 39 students. The instrument used is the test instrument of the study results of linear courses and non-test instruments to view the education response value, culture and character (EVCC) with a scale Likert as many as 30 statements. Stages of data analysis through test normality, correlation analysis, simple regression analysis and coefficient of determination. The results showed that education, value, culture and character significantly influenced the student mathematics achievement of the Linear Program, with its contribution of 13.6%, while the remaining student learning outcomes were influenced by other factors during online.
Mathematical critical thinking skill and self confidence according to student’s cognitive stage
Authors: Yuliani A , Fitriani N , Dahlan J A , Sumarmo U
Published: October 2020

The purpose of this survey is to examine attainment of student’s mathematical critical thinking skill (MCTS) and mathematical self confidence (MSC) according to its cognitive stage. The survey concerns with 36 eighth grade students’, test of logical thinking (TOLT), an essay MCTS test, and a MSC scale. Analysis data of this survey are computation on percentage and testing existancy of association between MCTS and MSC, and analysis rational on other findings. By using TOLT, survey invented some interesting findings among other were: a) 11 % at formal stage, 53% at transition stage, and 36 % at concrete stage; b) The survey detected that mathematical critical skill on formal stage students obtained higher grade than transition stage students and the transition stage students obtained higher grade than the grade of concrete stage students. The survey detected that Mathematical self confidence on formal stage student and transition stages have high mathematical self-confidence compared to students who are still in the concrete stage; c) There is a association between mathematical critical thinking skills with self confidence.
Camtasia-assisted computer statistics application practicum learning video in online classes to improve students’ mathematical understanding
Authors: Sukmawati Sri , Saumi Tia Fitria , Nasrullah Anton
Published: October 2020

The learning environment by relying on lectures and practice in class causes students to have a tendency to forget so that it can cause a lack of understanding ability, in fact, the understanding ability is a learning challenge to face the needs of the industrial revolution 4.0. The purpose of this research is to find out whether the achievement and improvement of understanding of students who learn with Camtasia-assisted learning videos are better than students who learn by not using learning videos. The method used is a quasi-experiment and the design used is a non-equivalent control group design. Samples were taken two classes purposively. The selected research sample consisted of two classes, 32 students from the experimental class and 48 students from the control class. The research instrument used was a comprehension ability test. The results of the study found are the achievement and improvement of understanding of students who learn with Camtasia-assisted learning videos better than students who learn by not using learning videos.
Mathematical disposition ability and critical thinking: Evaluation of middle school students
Authors: Minarti E D , Alghadari F , Hutajulu M
Published: October 2020

This study aims to examine the effect of the mathematical disposition of junior high school students on mathematical critical thinking skills. A quantitative approach with a correlational method used by researchers to examine both variables. Subjects were taken randomly in class. The subjects in this study were 32 students of class VIII in one of the Bandung junior high schools. The results of the study show that the mathematical disposition of junior high school students has a positive influence on mathematical critical thinking skills. Students with a positive disposition toward mathematical learning could interpret and not hesitate to express ideas. More than fifty percent of students who have a positive disposition were able to interpret and analyze the mathematical problem given. The teaching and learning process in this research is limited to circle material in junior high school and eighth grade in one of the junior high schools in Bandung city. There are still many other tendencies besides mathematical disposition, which enable students to have good critical thinking abilities, which affect student learning outcomes, one of that is students who have mathematical abilities that have been held since elementary school. This study shows that there was an influence of students ‘mathematical disposition on their ability to think critically so that to improve students’ critical thinking abilities, positive disposition abilities should be built. The ability to interpret and analyze students develop in line with passion and serious attention in learning, self-confidence, curiosity, and the courage to share opinions.
Students’ critical mathematical thinking abilities through flip-problem based learning model based on LMS-google classroom
Authors: Ramadhani R , Bina N S , Sihotang S F , Narpila S D , Mazaly M R
Published: October 2020

This research aimed to calculate the increase of students’ mathematics critical thinking ability in Senior High School who taught with Flip-Problem Based Learning based on LMS-Google Classroom. This research is quasi-experiment research used pre-test post-test control group design research. Sample in this research is 60 students divided into two research groups, 30 students in the experiment group (taught with Flip-Problem Based Learning) and 30 students in the control group (taught with Problem-Based Learning). The homogeneity test and normality data test used Levenes’ test and Kolmogorov Smirnov test. The result of the homogeneity test and normality data test is homogenous and distributed normally. Based on the result of the homogeneity test and normality data test, hence the hypothesis research test used Independent Sample T-Test. The test result showed that mathematical critical thinking ability for students’ Senior High School who taught with Flip-Problem Based Learning based on LMS-Google Classroom. The result proved that the mathematics learning process of Flip-Problem Based Learning has a positive and significant effect on students’ mathematics critical thinking ability. Based on this research result, Flip-Problem Based Learning was recommended to be applied in mathematics learning. LMS-Google Classroom can also be one of the solutions in mathematics learning based on digital.
Improvement mathematical problem’s solving ability of junior high school students by using inquiry models with everyone is a teacher here strategy
Authors: Aminulloh R , Suhendra  , Ristiana M G
Published: October 2020

This research is motivated by the need of solving mathematical problem ability and fact that Indonesian students have a low score of solving mathematical problem ability in junior high school. The aims of this research are intended to examine the application of learning by using inquiry models with everyone is a teacher strategy towards achievement and improvement of solving mathematical problem ability of junior high school students. The method used in this research is a quasi-experiment with a non-equivalent experimental design. The population of this research is students of grade eight from one of junior high school in Bandung period 2016/2017. This research’s taken two classes from grades eight, randomly. One class as an experimental class that got learning by using an inquiry model with EITH strategy and one class as a control class that got conventional learning. The result of this research, shown: (1) achievement of solving mathematical problem ability of students who gain learning by using inquiry model with EITH strategy is better than students who gain conventional learning (2) learning mathematic by using inquiry model With EITH strategy be able to improve students’ ability to solve mathematical problem (3) generally, students that got math’s learning by using inquiry models with everyone is a teacher here (EITH) strategy has given positive responses to this learning.
How are the process of abstraction of the division of fraction numbers by elementary school students?
Authors: Widada W , Herawaty D , Lusiana D , Afriani N H , Sospolita N , Jumri R , Trinofita B
Published: October 2020

The division of fractions is one of the difficult materials for elementary students. That is a concept that they must understand. Therefore, the abstraction process is needed to achieve it. The purpose of this study is to describe the abstraction process of dividing fractions by elementary school students. The subjects of this study were elementary school students in Bengkulu City, Indonesia. The subjects of this study were chosen 3 out of 85 elementary school students in Bengkulu City, Indonesia. There are two story questions submitted to research subjects about the distribution of mineral water after playing soccer. Subjects were interviewed in depth. That is a task-based interview. Data were analyzed through genetic decomposition. The result is students can be more meaningful in preparing propositions about fraction operations. Students can state that the division of fractions is a repetitive reduction. By providing contextual problems students can complete the process of abstraction, and can reach the concept of fraction division appropriately.
The correlation between students’ critical reading ability and their mathematical critical thinking
Authors: Wikanengsih  , Fauziya Diena San , Rizqiya Rissa San
Published: October 2020

This research aims at describing the relation between students’ ability in critical reading and their mathematical critical thinking at Mathematics Education Study Program of IKIP Siliwang. Critical Reading is one of basic skills for students to comprehend and value information. Reading comprehension skill will affect their study. This research is a descriptive study specifically correlational design. The subject is 40 students of Mathematics Education Study Program who have enrolled the General Indonesian Language subject. The result showed that there was significant correlation between the students’ critical reading skill and their mathematical critical thinking skill, with significance value < 0.05, that is 0.000 and the value of correlation coefficient of 0.774, which means a very strong correlation and positive, indicating a direct relationship. Accordingly, students of Mathematics Education Study Program need to have and practice critical reading to facilitate their mathematical critical thinking.
Improving student’s mathematical creative thinking and habits of mind using a problem-solving approach based on cognitive thinking stage
Authors: Desti R M , Pertiwi C M , Sumarmo U , Hidayat W
Published: October 2020

This research is a pre-post-test experiment that aims to examine the role of the problem-solving approach (PSA) and students’ cognitive intelligence on mathematical creative thinking abilities (MCTA) and mathematical habits of mind (MHoM). This study involved 50 8th grade students. The instruments used were TOLT test, MCTA test, and MHoM scale. This research found that students at the age of 13-14 years are at the stage of formal, transition, and concrete thinking. Whereas MCTA students who receive learning with PSA achieve better grades than students taught by the scientific approach (SA). The MCTA level of students who receive PSA is good and sufficient for students who receive SA. Both groups of students are still aware of some difficulties in completing MCTA tasks, such as solving problems improperly, in more than one way, and or in different ways. The MHoM results of the two students were not different, they were at a good level. Based on the cognitive thinking stage, it was found that there were significant differences in the improvement of MCTA between the two classes, there was a certain stage of thinking in the MCTA of the two classes, and there was no interaction. While for MHoM there is no difference in terms of approaches and stages of thinking, and there is no interaction. In Other findings, there is no relationship between MCTA and MHoM.
Improving english for early childhood through mathematical learning media VBA-asissted excel game
Authors: Bernard M , Alam S K
Published: October 2020

This study aims to determine the implementation process and the results of the application of VBA-assisted mathematical learning media for excel games in an effort to improve the English language skills of early childhood. The formulation of the problem in this study is whether mathematical learning media assisted VBA for excel games can improve the English language skills of early childhood? As well as how the implementation process, the results of the implementation of research, advantages, and disadvantages after the implementation of mathematical learning media. The approach used in this study is the quasi-experimental research method. The population in this study was in group B which amounted to 20 samples of early childhood. Based on the results of the study that there was an increase in English language skills of early childhood through VBA-assisted mathematical learning media for excel games. While the learning media applied in early childhood is successfully implemented, early childhood shows an active, enthusiastic, and happy attitude when learning takes place. Then it can be concluded that the application of VBA-assisted mathematical learning media for excel games in an effort to improve English language skills in early childhood takes place well and smoothly. Early childhood looks more active, creative and confident in learning English, so they can digest the media well in an effort to improve their English language skills.
Implementation of teaching materials using a realistic mathematics education approach in PGSD student concern for the environment
Authors: Rabbani Sylvia , Muftianti Agni , Septiyan Rahayu Galih Dani
Published: October 2020

The main problems in this study are the lack of awareness of PGSD students towards the surrounding environment and the lack of RME-based teaching materials that use used goods as a medium of learning. The long-term goal of the research to be carried out is to support the improvement of quality and the development of basic and regional education policies at the local and national levels through the improvement of the quality of the young generation of productive Indonesian hopes The specific target of this research is to get a picture of the results of the implementation of teaching materials “learning mathematics in elementary school”. The focus of this research problem is: 1) learning steps using the teaching material and 2). Obstacles felt when learning to use these teaching materials. And 3). Implementation of teaching materials uses a realistic mathematics education approach in learning awareness of the environment of PGSD students with the help of teaching aids made from used goods. The method used is the qualitative description, this study describes how elementary mathematics learning teaching materials, implementation of elementary mathematics learning teaching materials in caring for the environment of PGSD students and obstacles in implementing teaching materials. The results of this study are the steps in the implementation of elementary school mathematics learning teaching materials in learning environmental care for PGSD students.
Planting sprouts as a context in project-based learning and lesson study for learning and community
Authors: Andini  , Putri R I I
Published: October 2020

This research uses a project-based learning model on the material number patterns in grade 8 junior high school. The system in this study uses Lesson Study for Learning and Community (LSLC). The research method used is a design research. The research sample used was 8th-grade students at SMP Negeri 1 Palembang. Data collection includes interviews, video recordings, sound recordings, online media, and photos. The stages carried out in this study consisted of the stages of planning, trial design, and learning reflection. This study uses the context of planting sprouts as a starting point in the preparation of learning number patterns associated with the average material. The results of this study indicate that using the context of “Planting Sprouts” can help students understand the concept of number patterns in daily life.
Creative thinking skill of students through realistic mathematics education approach
Authors: Ismunandar D , Gunadi F , Taufan M , Mulyana D , Runisah
Published: October 2020

Creative thinking is one of the abilities students need to have because, with this ability, students can encounter every problem. However, not every student has this ability. This study aims to determine the effectiveness of using realistic mathematics learning approaches to improve students’ creative thinking abilities. This research is quasi-experimental. This research was conducted in one of the junior high school in class VII. Researchers conducted two tests on students, namely pretest and posttest. Each time after teaching the teacher together, the researchers evaluate learning to improve students’ abilities. The average result of the ability to think creatively at the pretest is 17.61. The average result of the ability to think creatively at the posttest is 30.09. Using the N-Gain test shows that realistic mathematics learning approaches are practical enough to increase students’ creative thinking abilities.
Learning materials through saving water
Authors: Meitrilova A , Putri R I I
Published: October 2020

The demands of the 21st century require students to be reliable communicators, creators, critical thinkers, and collaborators in solving problems through student involvement in learning. This research aims to explore the student’s mathematical reasoning abilities and problem-solving skills in mathematics using the cost of payments for water use as context. The subject of this research was eight-grade students of SMPN 19 Palembang. This research uses the method of design research with validation studies type which three stages, namely Preparing for the experiment; The design experiment consists of two cycles (Pilot Experiment and Teaching Experiment); and Retrospective analysis. The study results show that learning using receipts of water payments as a medium for saving water can help students develop reasoning and problem-solving skills in mathematics learning. However, students not accustomed to using information obtained from the analysis to solve the given problem. Students tend to provide non-mathematical arguments on each issue that require students to provide discussions about the learning material, especially data presentation.
Fruit salad’s recipes in the design of learning mean in eight-grade
Authors: Rahayu P T , Putri R I I
Published: October 2020

This study makes the learning process in the 2013 curriculum encourage students to provide learning processes with real challenges and solve them so that 21st-century skills can be realized. The study aims to determine the role of activities in average learning that are expected to help students analyze, solve problems, and implement the making of fruit salads. The method used in this study is the type of validation research design; research subjects are students of class eight grade. There are three stages in the validation of this type of research design; the research design has three cycles: the preliminary design, design experiments in the form of Initial Teaching Experiments (Pilot experiments) and teaching experiments, and retrospective analysis. The teaching experiment results show that if 50% of students complete the jumping task, applying (the implementation phase) in the process of making fruit salad. Errors in carrying out activities are not careful in reading the information, so people mistakenly see the price of fruit salad ingredients and their weaknesses in calculating and not understanding the material provided.
CORE RME learning model on improving students’ mathematical problem-solving ability
Authors: Son A L , Ditasona C
Published: October 2020

The use of learning models is crucial to consider to facilitate students’ mathematical problem-solving ability (MPSA). Therefore, this study was conducted to analyze the comparison of improving MPSA between students who learn through the model of Connecting, Organizing, Reflecting, and Extending with Realistic Mathematics Education (CORE RME), CORE model, and conventional model. Participants of this study consist of three groups of junior high school students, namely students who learned through the model of CORE RME of 50 people, students who learned through the CORE model of 49 people, and students who learned through the conventional model of 46 people. The findings in this study are that there were significant differences in the improvement of students’ MPSA who learn through the model of CORE RME, CORE model, and conventional model. Multiple comparison test results show that the development in the MPSA of students who learn through the CORE RME model was better than the students learning through the CORE model. There was no significant difference in the improvement of MPSA between students who learn through the CORE RME model and the conventional model, as well as between students learning through the CORE model and the traditional model.
Calculation of electric account as learning context based on project based learning (PBL) and lesson study for learning community (LSLC)
Authors: Agustina A , Putri R I I
Published: October 2020

This study presents the application of the project based learning model on the sum of integers. this research uses the lesson study for learning community (LSLC) system. The sample of this study was 22 seventh grade students of Srijaya State Junior High School Palembang. The research method used is design research (design research). This study designs project based learning based on account calculations. The stages of this study consisted of experimental preparation, design experiments and retrospective analysis. Based on the results of retrospective analysis, it is shown that by using electricity account calculations as a context in learning students can understand integers and sets.
Problem posing in the proof process identifying creative thinking in mathematics
Authors: Isnani  , Waluya S B , Rochmad
Published: October 2020

Creative thinking is an important part in learning mathematics. However, some Mathematics Education students have low creative thinking skills, especially in the proof process in the Real Analysis course. Use the Problem Posing approach to determine the quality of students’ creative thinking abilities in the Real Analysis course. Therefore this study aims to describe the potential of students as designers, in creative thinking in the proof of mathematics. This research is a qualitative research category, with a perspective-constructive approach. A total of 61 sixth semester students take Real analysis courses in the 2019/2020 Academic Year as research subjects. The student studied in two heterogeneous mathematics education classes, from one urban tertiary institution participating in this study. By using descriptive statistics and Pearson correlation can be obtained this research information. The results obtained by the problem posing condition can find a greater difference than the equivalent conditions, about two-thirds of students are able to make in some cases the original equivalent, as well as the relationship between student achievement on Sequences and Series material with originality found at the middle level. This type of research has the potential for lecturers and students to assess the level of student understanding of certain mathematical topics, concepts, or procedures.
Assessing the effectiveness of the contextual teaching and learning model on students’ mathematical understanding ability: a meta-analysis study
Authors: Tamur M , Jehadus E , Nendi F , Mandur K , Murni V
Published: October 2020

To date, in the literature, hundreds of studies have been found on mathematics learning that is supported by the Contextual Teaching and Learning (CTL) Model. Several studies with conflicting results are found in the literature. This meta-analysis study was carried out to combine and interpret the findings of this study. Related databases are sought for studies that qualify for examining the effects of CTL compared to conventional learning on students’ mathematical understanding abilities. Random-effect models with 95% confidence intervals (CIs) were estimated. 21 effect sizes were analyzed from 21 primary studies that met the inclusion criteria and were published in ERIC documents, journal articles, proceedings, and repository documents from 2010 to 2020, and with a total of 1349 students involved. The Comprehensive Meta-Analysis (CMA) program is used to assist analysis. Based on the results of the analysis found the overall effect size (ES) is 0.868 with a standard error of 0.155 based on a random-effects model. The size of the effect represents that the average student exposed to CTL exceeds the ability of mathematical understanding by 76% of students in conventional classes who are initially equivalent. This result can also be interpreted that, students shift from the 50th percentile to the 79th percentile in mathematical understanding abilities when CTL is applied. The results of the analysis of the mediator variables were found that all variables except the year of study and education level were related to ES. The strongest relationship was found for sample size variables and publication sources. The analysis shows that CTL is more effective if it is applied in the condition of a sample size of 1-30 students. It was found that there were sources of publications which tended to publish only significant studies, although they did not indicate publication bias. These facts are considered by mathematics education practitioners for CTL implementation in the future.
The abstraction process of junior high school students
Authors: Amelia R , Chotimah S , Kadarisma G
Published: October 2020

The background of this study is in fact that students’ abstraction process still low in geometry. Straight-line equations are a prerequisite in understanding geometry material further. Therefore, the objective of this study is to measure the process of student abstraction in straight line equations. The population in this study are Eight Graders from one of the junior high schools in Cimahi City, with the selection of research subjects, namely schools in the medium cluster category in Cimahi City. and the samples in this study are 3 students that categorized on high, medium and low abilities. This research is a descriptive qualitative study. The instrument of the research is a test that is analysed to see and measure the student’s abstraction process which appears in straight line equations. The results of the analysis and observations show that the abstraction process from 3 students who categorized based on high, medium and low ability, shows different ability on abstraction process on the criteria of verbal reasoning, numerical ability, and abstract reasoning. Students with high ability category have high variable reasoning ability, high numerical ability and high abstract reasoning as well. While students with medium abilities have high variable reasoning abilities, moderate numerical abilities and medium abstract reasoning. For students with low ability categories have low variable reasoning ability, moderate numerical ability and low abstract reasoning. So this process of abstraction can be seen from students with high ability categories. As for students of medium and low ability, need more guidance so that their abstraction process can improve.
The ability of understanding mathematical concept and self-regulated learning using macromedia flash professional 8
Authors: Tsany U N , Septian A , Komala E
Published: October 2020

Changes to the curriculum in Indonesia have also caused changes in the learning process. Students are required to play an active role in classroom learning, while teachers only act as facilitators. So that in this curriculum, students are expected to have self-regulated learning. But also, another aspect that must still be had by students is a good understanding of concepts, especially in a material that is considered difficult like mathematics. One alternative way that can be done to achieve both aspects is the use of instructional media, such as interactive multimedia. One interactive multimedia that can be used is the Macromedia Flash Professional 8 application. This study aims to compare two groups with different treatments on trigonometry material. This study uses a quasi-experimental method with the non-equivalent control group design. This study was divided into two groups; the first group was given learning using flash media as an experimental group and the second group as a control group using ordinary learning. The sample in this study was taken from two classes of thirteen classes with purposive sampling, namely class X RPL 2 and X AKKUL 1 in SMK Negeri 1 Cianjur. Data were analyzed using the Mann Whitney Test and the Independent Sample t/t′-test. The results showed that the achievements and increased ability to understand mathematical concepts from the experimental group were significantly better than the control group. Based on N-gain criteria, the increased is including the medium category. At the same time, the self-regulated learning of the experimental group is the same as the self-regulated learning of the control group.
Using VBA for microsoft excel based on 6-questions cognitive theory in teaching fraction
Authors: Wijaya T T , Zulfah Z , Hidayat A , Akbar P , Ariani W , Asyura I
Published: October 2020

Learning media is a tool that is used to make the teaching and learning process easier. In this modern era, most of the students complained that mathematics is hard and boring. Other than that, the traditional teaching method makes students less practical and not mastering the concept taught, which is why there is a need of a learning media innovation using Information and Communication Technology (ICT). Learning fraction in primary school can be helped using VBA for Microsoft excel in supporting the fraction subchapter so that it will be more interesting and easier to understand. The purpose of this research is to develop a VBA for Microsoft excel on fraction, which then is evaluated on their validity and practicality as a learning media. The design of this research is using the experimental design with pre-test and post-test to compare the students’ understanding ability on fraction between the class that uses VBA for Microsoft excel and the traditional teaching method. The result of this research shows that the learning media, we can conclude that VBA for Microsoft excel based on the 6-questions cognitive theory can improve the students’ understanding ability significantly.
Development of an online mathematical misconception instrument
Authors: Irawan E , Wilujeng H
Published: October 2020

The misconception is one phenomenon that often occurs in the fields of science, including mathematics. To find a solution, diagnostic needs to be done about misconceptions on the basic concepts of mathematics. The purpose of this study was to develop an online diagnostic misconception test instrument. The research method used is development research using the ADDIE model. There are five stages of research, namely: analyze, design, develop, implement, and evaluate. Proof of validity is done using the Aiken index involving five judgment experts. The validation results show that the instrument has high content validity. Likewise, with the results of the instrument trials, it shows that the instruments developed are valid and reliable. These results indicate that the developed instrument can be used for misconception diagnostic tests of basic mathematical concepts. The instrument can be used to diagnose misconceptions among students, students, teachers and other communities.