bluuebunny/crossref_metadata_2025_split huggingface dataset:
The properties of magnitude ranking function of trapezoidal fuzzy numbers
Authors: Karyati  , Wutsqa D U , Binatari N 
Published: July 2020

Abstract
There are many ranking function of a fuzzy number. Yager, Maleki, Adamo, centre of maxima, centre of gravity, and soon. This paper discusses about the ranking function for trapezoidal fuzzy number that is called magnitude method. We get some properties related to the arithmetic operation. The other result says that this magnitude method has ordered properties.
Loss distribution approach for company operational risk analysis
Authors: Fuadi M Z , Kusumawati R , Inayati S , Sahid  
Published: July 2020

Abstract
The measurement of potential operational losses as an assessment of capital adequacy is needed by the company. One value that can be used to measure the potential loss of a company is Value at Risk (VaR). This paper aims to measure VaR based on the loss distribution using the Bayesian method where the loss frequency is assumed to be Poisson distribution and the loss severity is assumed to be the distribution Lognormal. VaR with Monte Carlo (MC) and Fast Fourier Transformation (FFT) simulations are compute using the values of the parameter of distributions that have been obtained by using the Bayesian method. In this paper, a numerical example of VaR estimation of a bank company is demonstrated to find the estimate VaR from several sources i.e. internal fraud, external fraud, business practices, employment practices, process failure, system failure and damage to assets. The results showed that the estimate VaR value equal to $ 8.2336044 with Monte Carlo and and $8.522028 with FFT simulation at 99% confidence level. These means that the company has the opportunity to experience operational risk losses which exceeds $ 8.2336044 and $8.522028 in the coming year by 1%.
Forecasting the farmers’ terms of trade in Yogyakarta using transfer function model
Authors: Hidayat L , Wutsqa D U 
Published: July 2020

Abstract
The transfer function model is one of the forecasting models that predicts future values from a time series based on its past values and the other variables. In this paper, the transfer function model is utilized to forecast the farmers’ terms of trade in Yogyakarta province. The farmers’ term of trade (FTT) is one indicator of farmers’ welfare. The variables included in the model inputs are the inflation and exchange rate in Yogyakarta. The procedure for transfer function modeling is through two stages, those are building a single input transfer function model for each input based on the autoregressive integrated moving average model, and then building the transfer functions simultaneously for all variables. The result demonstrates that the transfer function can predict farmers’ terms of trade accurately with the mean absolute percentage error value of 0.841%.
Ordinal regression model for analyzing factors affecting obesity levels in middle-aged adults in Indonesia
Authors: Kusumaningrum E , Kismiantini  , Wustqa D U , Fauzan M 
Published: July 2020

AbstractObesity is one of the major issues in many countries, including in Indonesia. In this study, the obesity category based on body mass index (BMI) is categorized into four levels, namely non-obese with BMI below 30 kg/m2, obesity I with BMI 30 – 34.9 kg/m2, obesity II with BMI 35 – 39.9 kg/m2, and obesity III with BMI above 40 kg/m2. The objective of this study was to assess factors affecting Indonesian obesity levels using ordinal logistic proportional odds models for each gender aged 40-65 years based on the fifth Indonesian Family Life Survey (IFLS 5) data. In totals of 4,658 male participants and 4,772 female participants were included in the analyses. The prevalence of severe obesity was associated with age, education, working status, and waist-hip circumference ratio for both men and women. With addition that the frequency of eating affects the prevalence of severe obesity for women. Men and women who had smaller waist-hip circumference ratio occurred to have higher probability of non-obese.
The characteristics of mathematical material deepening test for the national examination of junior high school
Authors: Prasetya Y , Hartono  
Published: July 2020

Abstract
The Material Deepening Test (MDT) is a test to prepare students to face the National Examination in Indonesia. The MDT test results are used as an evaluation and consideration of teachers towards students’ readiness to face the National Examination. The MDT test developed based on blue print of the National Examination. This study aims to describe the characteristics of the MDT for National Examination of junior high school in mathematics subject in Sleman Regency of Indonesia. This study is an explorative descriptive using a quantitative approach. Data collected by documentation technique. The characteristics of MDT analyzed using the classical test theory. The results show that the test is valid with Aiken’s index of 0.87 and included in the high category of content validity. Reliability index of test is 0.70 in good category. There are 19 items have discriminant index in good category, 8 items in quite good category, and 11 items in not good category. There are 3 items have difficulty index in easy category, 20 items in moderate category, and 15 items in difficult category. The most difficult material items for students are lines and angles, where the indicator is determining the angle formed from the real problem.
The ability of prospective teachers to pose contextual word problem about fractions addition
Authors: Kadir K , Kodirun  , Cahyono E , Hadi A L , Sani A , Jafar  
Published: July 2020

Abstract
The low understanding of students on fractional topic has hampered the development of mathematics learning in Indonesia. This study was conducted to investigate in depth the ability of prospective teachers in developing the problem. Thirty four mathematics prospective teachers were asked to ask about contextual word problem whose solution could be obtained from counting

4
5

and

2
3

. Data consists of a verbal protocol together with written notes made by the subjects. Qualitative analysis of the obtained data is focused on identifying the resulting problem structure and the type of context commonly used. The results showed that the most widely used contexts in the proposed story problem were the distribution of the cake, the weight of the object, the lots of the object, and the length of measurement. The structure of contextual problem produced by mathematicis prospective teacher has weaknesses in two components, namely: 1) in proposing appropriate contexts; and 2) in providing sufficient information so that the solution of the proposed problem can be obtained by applying the arithmetic concept of

4
5

plus

2
3

, These results suggest new findings about prospective teacher difficulties in conceptualizing fractions.
Diagnosis of learning difficulties in mathematics for students resolving problems related to material in the pythagorean theorem for 8th grade students in SMP 1 Todanan and SMP Muhammadiyah 9 Todanan, academic year 2018/2019
Authors: Puspitarani  , Retnawati H 
Published: July 2020

Abstract
This study was aimed at diagnosing the difficulties encountered by students of mathematics when problem solving Pythagorean Theorem materials, and at describing the type, location and factors of difficulty experienced by students in solving diagnostic questions of Pythagorean Theorem materials. The research used descriptive research with a qualitative approach. The research subjects were taken randomly. The most dominant type of difficulty experienced by all students in SMP Muhammadiyah 9 Todanan and in SMP 1 Todanan in completing the mathematical diagnostic test questions was in finding solutions to problems and checking answers. While the location of the difficulties experienced by students of both schools in completing the mathematical diagnostic test questions was in writing clues, problems, formulae and finding solutions to problems, they also experienced difficulties in reviewing answers and drawing conclusions. The factors that caused students difficulty in solving these test questions were as follows: Students were unable to solve the root of the results, they often forgot formulae and ways of answering the questions given. Students were not careful when solving problems and were in a rush to do so.
The effect of applying TPS type cooperative learning model assisted by SPSS software on students’ skills in IT-based statistical data analysis course
Authors: Ariawan R , Wahyuni A 
Published: July 2020

Abstract
This study aimed to discover the effect of applying TPS type cooperative learning models assisted by SPSS software on students’ skills in IT-based statistical data analysis course. The research method of this study was a Quasi Experiment with pretest-posttest non-equivalent multiple-group research design. The samples were selected by using the pusposive sampling technique. The samples were the sixth semester students of the Mathematics Education Study Program of FKIP Islamic University of Riau Academic Year 2018/2019, who were attending IT-Based Statistical Data Analysis course. The instrument of this research was questionnaires. The data were collected by using a non-test technique; then, the data were analyzed by applying inferential statistical analysis. Based on the results of data analysis, it was obtained that the value of Sig. 0.684 > 0.05 or H0 was accepted. Thus, it can be stated that there is no effect of the application of TPS type cooperative learning model assisted by SPSS software on students’ skills in IT-based statistical data analysis course.
Ethnomathematics: Utilizing South Sumatra’s cultures to emphasize prospective teachers’ creativity in creating mathematical problem
Authors: Araiku J , Somakim  , Pratiwi W D 
Published: July 2020

Abstract
This Study aims to describe prospective teachers’ creativity in producing mathematical problems based on South Sumatra’s Cultures. The subjects are 30 3rd-year mathematics study program students of Sriwijaya University. These students are divided to 8 groups of three or four. Each group assigned to create 2 mathematical problem from the same cultural context in two weeks. The results show that there is improvement for students’ fluency, flexibility, and elaboration aspect. Students are able to create more than one mathematical problems, proposes more than one resolution, and some of them are able to evaluate those alternatives. There is no significant improvement in the aspect of originality. The topic engaged with the culture tend to be uniform, with most groups employ the concept of geometry and transformation. However there is a sense of mathematical modeling in students’ works. Therefore, it is suggested to conduct further research on ethnomodeling.
Characteristics of non-compulsory mathematics test items on nationally standardized school examination in Kaimana Regency, West Papua Indonesia
Authors: Sampouw F , Retnawati H 
Published: July 2020

Abstract
Nationally Standardized School Examination result is used as a students’ graduation requirement. Therefore, it is absolutely necessary that its test items must be well constructed to assess. The aim of this study was to describe the characteristics of non-compulsory mathematics test items on Nationally Standardized School Examination of senior high school in Kaimana Regency, West Papua based on the items analysis. This study was a descriptive exploratory type of quantitative research. Data obtained from a set of Non-compulsory Mathematics test items including documentation of students’ answers of the following test items on Nationally Standardized School Examination of senior high school in Kaimana Regency, West Papua. A set of this test item was validated by 5 experts and analyzed by applying Classical Test Theory. Results showed that the content validity was valid for 0.9 as the average of index Aiken. The reliability of test items was in less reliable level. The items difficulty indicated that 29 items (85.3%) were hard and 5 items (14.7%) were moderate. The value of items discrimination index for 12 items (53.3%) were classified as good and 22 items (64.7%) were poor. For multiple-choice items, the distractor was made by the developer, worked effectively.
Flow-proof strategy in proof construction on geometry instruction
Authors: Scristia  , Hapizah  , Sumarni  , Araiku J 
Published: July 2020

Abstract
The purpose of this research is to assess the role of flowproof strategy implementation in improving students’ mathematical proof in similarity and congruence. Proofing similarity and congruence is a prerequisite in developing mathematical skills. The subjects include prospective mathematics teachers, and the study used a qualitative descriptive technique. The implementation of the flow-proof strategy was achieved through four activities, including re-writing existed information, stating what is needed to be proved, using existed rules such as postulate and definition, and writing the results in flowcharts. The findings shows that flow-proof strategy on Geometry construction was implemented appropriately, based on students’ performance in similarity and congruence proofs with percentage of 72% from all research subject.
Mathematics learning based on multiple intelligences with scientific approaches: How are their roles in improving mathematical literacy skills?
Authors: Hasmiwati  , Widjajanti D B 
Published: July 2020

Abstract
Having mathematical literacy skills have become a necessity for the 21st century. This ability is important to support the increasingly complex ability to solve everyday mathematical problems. Mathematics teachers must be able to choose the right learning approach to improve students’ mathematical literacy skills. The approach currently recommended is Scientific. However, not every child is intelligent in logical-mathematics. Therefore, the scientific approach needs to be implemented in the mathematics class based on the theory of multiple intelligences. This article discusses how mathematics learning based on multiple intelligence theories with a scientific approach can improve students’ mathematical literacy skills. Through a study of several theories and supported by relevant research results it can be concluded that the combination of learning based on multiple intelligence theories and scientific approaches has the potential to improve students’ mathematical literacy skills.
Self-esteem in mathematics learning: How to develop it through contextual teaching and learning approach?
Authors: Nabila L A , Widjajanti D B 
Published: July 2020

Abstract
Self esteem is important in learning mathematics. Self esteem is a part of self-concept that involves students in evaluation and self-assessment. But in fact in mathematics learning, there are still students who have not looked at themselves positively so resulting in students having low self esteem or lack of self confidence. Low self-esteem or lack of self-confidence can be caused by negative experiences that they had before when they studied mathematics. Whereas, self esteem has a positive effect on mathematics learning outcomes of students. There are studies that show a positive correlation between self esteem and mathematics learning achievement. Then the question is: what can a math teacher do to help students develop their self esteem? One of possible way, teachers can help students to develop their self-esteem is by applying contextual teaching and learning approach. Contextual teaching and learning approach is learning that connecting learning subject matter with everyday life. This article will discuss how to develop students’ self esteem in mathematics learning through contextual learning approach.
The perspective prospective professional teachers toward (specific) pedagogical content knowledge on derivative concept
Authors: Rosnawati R , Wijaya A , Tuharto  
Published: July 2020

Abstract
This study is aimed to investigate the pedagogical content knowledge of prospective professional teachers who participated in the In-service Teacher Professional Program (Program Profesi Guru Dalam Jabatan or PPG Daljab) for the topic of Derivative. The investigation into teachers’ knowledge was conducted during the phase of developing lesson plan. For this purpose, 24 in-service teachers were observed during their participation in the PPG program. The data analysis was performed for the interview results, the teachers’ lesson plan (RPP), and observation note from the peer teaching activities. The data analysis reveal that the teachers already possessed a correct conceptual understanding of derivative as indicated from their lesson plan. Nevertheless, the concepts that teachers presented in the lesson plan was still partial and did not represent a comprehensive conceptual understanding. This partial conceptual understanding was also observed during peer teaching activities. When performed a teaching simulation, teachers tended to deliver the concept in a procedural way so that the classroom activities did not fully support the development of students’ higher order thinking skills.
The analysis of mathematical communication skills in junior high school students
Authors: Ningtias S W , Sutiarso S , Caswita  
Published: July 2020

Abstract
This study aims to determine the students’ mathematical communication skills in the system of two-variable linear equations material. The subjects in this study were 8th grade students who were selected by purposive sampling technique. The method used in this research is descriptive. The data obtained from the students’ mathematical communication skills test consisting of 2 essay items including 3 indicators of mathematical communication skills, namely, drawing (expressing ideas into the form of images, graphs or diagrams), written text (providing the mathematical explanations in the correct language), and mathematical expression (making mathematical expressions). The test was given to 30 students of 8th grade at SMP Muhammadiyah 3 Bandar Lampung. The data were analyzed quantitatively and qualitatively to get a comprehensive picture related to the students’ mathematical communication skills. The results showed that the percentage of the achievement in each indicator of students was classified as low. This can be seen from the percentage of the achievement of the students’ mathematical communication indicators interpreted as follows, namely 1) drawing at 22%, 2) written text at 55%, and 3) mathematical expression at 12%.
Instructional media for space geometry based on augmented reality to improve students’ spatial reasoning
Authors: Pangestu A , Setyaningrum W 
Published: July 2020

Abstract
Technology development is growing rapidly in the 21st century. It takes a thorough preparation in various fields to deal with this condition, including in education field. Technology can be used to help learning process in the classroom particularly as an instructional media. This research aims to determine the effectiveness of instructional media of space geometry based on augmented reality in improving students’ spatial reasoning. The data were collected in one junior high schools in Yogyakarta-Indonesia. Thirty-three students of grade 8th were involved in this study. The results show that learning media is feasible to use and effective to improve students’ spatial reasoning as shown from the spatial test in which most of the students can solve the spatial reasoning tests and the spatial score were increase from 49 to 79.35 from the maximum score 100. This finding implies that AR instructional media could enhance spatial skill as it provides better visualization.
The profile of student math-anxiety
Authors: Widjajanti D B , Listyani E , Retnowati E 
Published: July 2020

Abstract
The main objective of this research was to describe the level of anxiety of junior high school students (SMP and MTs) towards mathematics and to identify what symptoms most appeared in students. The study conducted in 10 SMP/MTs in Kulon Progo Regency, Yogyakarta, Indonesia, representing 66 SMP/MTs in Kulon Progo. The research subjects were 943 junior high school students of grade VII, VIII, and IX from eight SMP and two MTs. Data collected through instruments in the form of a Likert model psychology scale. The conclusion of this research is as follows. First, the level of students’ anxiety towards mathematics (math-anxiety) was in a low category. Second, the percentages of students who have very low, low, moderate, high, and very high anxiety levels are 4%, 50%, 41%, 5%, and 0%, respectively. Third, the levels of anxiety of students towards mathematics are almost the same for each grade, which in the low category, except for grade VIII SMP who is in the moderate category. Fourth, psychological symptoms appear more often than physiological symptoms. Fifth, there are five questions that the most “often” and “always” answers. The items are as follows. Fist, I am relieved if the mathematics class is empty. Second, I am relieved if the math class ends”. Third, I am upset if I have to learn mathematical material without being explained first. Fourth, I am shocked if my teacher gives a lot of math homework. Fifth, I am appalled if my teacher suddenly gives a math quiz. To reduce students’ anxiety towards mathematics, it recommended for a mathematics teacher to use a humanist approach to learning.
The effectiveness of problem based learning assisted by cabri 3D on student’s mathematical communication writing and drawing skills
Authors: Apriatna E J , Budiyono  , Indriati D 
Published: July 2020

Abstract
This study aims to describe: (1) the effectiveness of the Problem Based Learning (PBL) model assisted by Cabri 3D on student’s mathematical communication writing skills and student’s mathematical communication drawing skills; and (2) comparison of effectiveness between PBL models assisted by Cabri 3D and conventional learning on student’s mathematical communication writing skills and student’s mathematical communication drawing skills. This research is a quasi experiment. The data was collected through tests of student’s mathematical communication writing skills and student’s mathematical communication drawing skills. The data was analyzed descriptively and statistically. The data is displayed based on average and standard deviation as a descriptively. The statistical test is used to the proportion’s test of one population and the proportion’s test of two populations. The results of the study is the 5% significance level, it can be concluded that (1) PBL models assisted by Cabri 3D effective on student’s mathematical communication writing skills and student’s mathematical communication drawing skills; and (2) PBL models assisted by Cabri 3D are more effective than conventional learning models on student’s mathematical communication writing skills and student’s mathematical communication drawing skills.
Compliance Adjustment of a Gripper System Designed for the Seizing of Objects of Modifiable Consistency
Authors: Deaconescu Andrea , Deaconescu Tudor 
Published: July 2020

Abstract
The necessity of seizing objects of unknown forms and/or consistency entails conceiving gripper systems whose design and control strategies are oriented towards the capacity of safe physical handling. This could be achieved by the utilisation of a linear pneumatic muscle benefitting from an inherently compliant behaviour. The paper presents and discusses such a soft gripper system. A gripper system of this type does not require the presence of sensors or complex controllers, as it is the mechanical system itself that provides the required adaptive behaviour. The compliance of the entire system is achieved by modifying air pressure in the pneumatic muscle within a closed loop, thus ensuring the safe gripping of deformable objects.