bluuebunny/crossref_metadata_2025_split huggingface dataset:
Stackelberg scheme in vendor – buyer inventory model for imperfect quality product with partial backordering
Authors: Setiawan R , Chrisnawati H E 
Published: July 2020

Abstract
In this paper, several new mathematical analysis approaches in probabilistic inventory model which incorporate both imperfect quality items existence and lead-free demands are proposed using non-cooperative games. Considered the monopolistic relationship between vendor and buyer in some real inventory problem, the vendor is set to be a leader who determines the Stackelberg’s optimal move after observing the optimal responses from the buyer as a follower. Optimum condition using Karush – Khun – Tucker conditions is applied with Stackelberg scheme to get optimum value of the system.
An application of Interregional effect on Central Java province economy (interregional input output approach)
Authors: Subanti S , Hakim A R , Riani A L , Hakim I M , Irawan B R M B 
Published: July 2020

AbstractThe changes in the structure of the Indonesian economy not only affect the interregional linkages but also the intersectoral linkages, no exception the Central Java Province. This paper aims to calculate and to interpret the interregional effect, especially Central Java Province, to the main island in Indonesia. Using the Interregional Input - Output data for 2005. The study found that the sectors that provide the greatest interregional effect as follows (1) the electricity gas water sector for Central Java and other provinces in Java Islands; (2) the air transport sector for Central Java and Sumatra Islands; (3) the water transport sector for Central Java and Kalimantan, also Central Java and Bali, West Nusa Tenggara and East Nusa Tenggara; (4) oil refining industry sector for Central Java and Sulawesi; (5) animal husbandry and other products sector for Central Java and Maluku - North Maluku - Papua.
Analysis of global stability of HIV/AIDS epidemic model in homogeneous community
Authors: Sutimin  , Khabibah S , Munawwaroh D A , Soelistyo R H , Henindya A 
Published: July 2020

AbstractA model of HIV/AIDS epidemic in homogenous community is proposed and analyzed the global dynamic. The model is studied to investigate the existence of equilibria and analyze the global stability. The global dynamic is determined by the basic reproduction ratio that is obtained from the next generation matrix of the model. The endemic equilibrium point is globally asymptotically stable when this ratio exceeds unity, while the disease free equilibrium achieves the global stability when the ratio is less than unity. The simulation results are presented to simulate the evolution of population in the long term
Probabilistic quadratic programming model for Sewon-Bantul facultative ponds optimization
Authors: Sunarsih  , Sutrisno  
Published: July 2020

Abstract
This article is addressed to show the result of a probabilistic mathematical model implementation in Sewon, Bantul facultative wastewater treatment pond to analyse the performance of the pond. The model was developed in a probabilistic quadratic optimization model and was solved by using probabilistic programming by using deterministic equivalent approach. LINGO 18.0 optimization software package was employed to do the computation. The optimization result was giving the optimal decision value for the wastewater volume that should be processed in the pond in order to gain the best performance and the storing time of the wastewater for each facultative pond. For each facultative pond, the load volume of the wastewater should be 1199.5 kg where the storing time is 13.2 day for the first pond, 13.24 day for the second pond, 25.59 day for the third pond and 30.30 day for the fourth pond. This optimal decision, then, can be used by the decision maker (WWTP operator) in order to optimize the performance of the treatment ponds.
Didactical design of Sundanese ethnomathematics learning with Endog-endogan and Engklek games in primary school
Authors: Supriadi S , Arisetyawan A 
Published: July 2020

Abstract
This article aims at optimizing Sundanese ethnomatematics learning by improving the modeling and creative thinking abilities of primary school students using teaching materials developed with the Didactic Design Research method. The research subjects involved were first-grade and second-grade students of an Islamic primary school in the city of Serang, Banten with a total of 283 students. The data were obtained using learning obstacles test instrument, Initial Didactic Design and Revised Initial Didactic Design as the instruments. The results of the study show that learning barriers were experienced in the materials of addition and subtraction of numbers. The Initial Didactic Design was revised and developed using Sundanese ethnomathematics learning using endog-endogan and engklek games that resulted in the improvement of primary students’ creative thinking, geometry thinking, and algebra.
Student error analysis in global meta-level algebraic thinking on treffinger learning assisted by scaffolding
Authors: Agoestanto A , Rinachyuan W 
Published: July 2020

Abstract
This study aims to: (1) find out the quality of Treffinger learning assisted by scaffolding; (2) find out whether students’ abilities in global meta-level algebraic thinking in Treffinger learning assisted by scaffolding reached minimal completeness criteria score; (3) describe the types and causes of student errors in global meta-level algebraic thinking; (4) describe the types of scaffolding that could minimize student errors in global meta-level algebraic thinking. This study used a mixed-method. The results showed that: (1) the quality of Treffinger learning assisted by scaffolding was very good; (2) students’ abilities in global meta-level algebraic thinking on Treffinger learning assisted by scaffolding reached minimal completeness criteria score; (3) upper group students tended to make comprehension errors, middle group students tended to make comprehension and process skills errors, lower group students tended to make comprehension, process skills, and encoding error; (4) the type of scaffolding was given to students include the distribution of student worksheets which providing assistance according to the group’s level (environmental provisions), explaining, reviewing, and restructuring.
Using of divergent problems based on teacher scaffolding levels to grow of advanced mathematical thinking of senior high school students
Authors: Pujiastuti E , Suyitno A , Sugiman  
Published: July 2020

Abstract
Senior High School (SHS) students need to have advanced mathematical thinking. Its growth can be measured through divergent problem solutions based on the teacher’s scaffolding levels. The problems are: (1) How to identify the levels of scaffolding by the teacher to foster advanced mathematical thinking? (2) How to get the results of the analysis to foster of advanced mathematical thinking of SHS students through divergent problem solutions based on the teacher scaffolding levels? The research method was a qualitative approach. The subject of this study was to take 5-6 students of SHS 1 of Ungaran. Research activities: (1) identifying of scaffolding leveling by teachers to foster the advanced mathematical thinking, (2) analyze the growth of advanced mathematical thinking of students of SMAN 1 Ungaran through divergent problem solutions based on the teacher scaffolding levels, (3) conducting of solution analysis of divergent problems based on teacher scaffolding levels; Interview; data analysis; and triangulation. The results: (1) Identified the level of scaffolding by the teacher how to foster advanced mathematical thinking. (2) Obtained the analysis results to foster of advanced mathematical thinking of high school students through divergent problem solutions based on teacher scaffolding leveling. Recommended advice: Teachers need to train their students to be able to work on divergent mathematical problems and provide tiered scaffolding.
Learning reflection through the context of Central Java historical building
Authors: Nursyahidah F , Saputro B A , Albab I U 
Published: July 2020

Abstract
This study aims to produce a learning trajectory by using the context of Central Java historical building in helping students to understand the concept of one of material in geometry transformation that is reflection. The approach used in this research was Realistic Mathematics Education, in Indonesian version is called by PMRI. Subject of this study was the third grade students of Junior High School 6 Semarang, Central Java, Indonesia. The methodology used was a design research consisting of three phases, namely the preliminary design, the design experiment, and the retrospective analysis. However, this study only shows the results at the design experiment phase, in particular on a pilot experiment. Data collection was done through several techniques, namely: video recordings, photograph, students work result, and students interview during learning process. Student learning activities consist of four activities, namely: observing the video of Central Java historical building, determining, drawing, and finding formula of the shape result of reflection in cartesian coordinate system, determining, drawing, and finding formula of the shape result of reflection by the line which parallel to x-axis and y-axis, and solving problem related to reflection. The results of this study indicate that through a series of activities that have been designed could help to stimulate students understanding of reflection concept by using the context of Central Java historical building.
Problematic of definition and terminology affecting primary teachers’mathematical knowledge for teaching geometry
Authors: Susanto D 
Published: July 2020

Abstract
Mathematics is often seen as universal across cultures. However, there exist differences in symbols, conventions, terminology, and definition used in different cultures. In some situations, the distinctions may be mathematically trivial and have no adverse effect on mathematics instructions. However, in other situations, there may be significant consequences on both mathematical understanding and instructions. This paper examines one such instances in the context of learning and teaching geometry in Indonesia, where the terminology, convention, and definition used caused hurdles in primary teachers’ knowledge and understanding of the geometry concepts they teach. Some suggestions to ameliorate these challenges are proposed.
Needs analysis and data analytics skills of PGSD Department Students Universitas Negeri Semarang
Authors: Trimurtini  , Nugraheni N , Widihastrini F , Susilaningsih S 
Published: July 2020

Abstract
Data analytics skill in statistics is vital because it is immediately related to the accomplishment and writing of students’ final projects. The objective of the preliminary study is to describe the data analytics skills of Primary School Teacher Education (PGSD) students and analyze students’ needs in their attempts to accomplish and write the final project on time. This qualitative study was conducted at the Department of Primary School Teacher Education, Faculty of Educational Universitas Negeri Semarang, involving students in the sixth semester as the research subject. The techniques of data analysis were the interactive model by Miles and Huberman and Rasch model. The results of this study showed that students in the sixth semester needed innovation in the learning sources for educational statistics course by 95.15%. Data analytics skills of students achieved the average logit model by 0.37. The conclusion of the preliminary study is the majority of students in the sixth semester need innovation in learning sources for educational statistics course and students’ skills in analyzing data which are categorized high are only 8%.
Critical thinking skills based on mathematical dispositions in problem-based learning
Authors: Susilo B E , Darhim D , Prabawanto S 
Published: July 2020

Abstract
This study aimed to describe students’ critical thinking skills based on mathematical dispositions in Problem-based Learning. This study used descriptive exploratory methods with instruments: test, scale, observation, and documentation. Data was taken from 39 undergraduate students from the mathematics education study program at a university in Central Java. The indicators of critical thinking skills used were abilities in analyzing problems, concluding and giving explanation, evaluating, and choosing problem-solving strategies. The results showed that: (1) there are no students in the negative mathematics disposition group, (2) the enhancement of students’ critical thinking skills in Problem-based Learning belongs to the medium category; (3) students in the low positive mathematical disposition group have marginally adequate abilities in analyzing, explaining, and choosing strategies, and adequate abilities in evaluating; (4) students in the moderate positive mathematical disposition group have adequate abilities in explaining, good abilities in analyzing and choosing strategies, and excellent abilities in evaluating; and (5) students in the high positive mathematical disposition group have good abilities in explaining and choosing strategies, excellent abilities in evaluating and analyzing. There was a trend of increasing the achievement of indicators of critical thinking skills based on mathematical disposition in Problem Based Learning.
Designing augmented reality-based mathematics mobile apps for outdoor mathematics learning
Authors: Ahsan M G K , Miftahudin  , Cahyono A N 
Published: July 2020

Abstract
Augmented reality, one of the current technologies, can make a virtual object on the real-life environment, and it is suitable for the space geometry learning. The purpose of this research is to design an Augmented Reality-based mathematics mobile phone application for outdoor mathematics learning about space geometry. This study used a design research method consisting of the design and implementation stages. The focus of this paper was on the designing stage. The Preliminary analysis in school showed that mathematics learning used instructional media frequently, and the school environment had some real-life objects similar to the space geometry objects. The app design of the user interface was made in order to make it easy to use, the 3D model was designed according to the scientific learning to help students to illustrate mathematically the real problems faced. The outdoor mathematics learning was designed by making some exercises that used the objects around the school. The results of the feasibility test of the product indicated that the application was suitable for the use in outdoor mathematics learning in schools.
Students’ mathematical communication ability in the ethnomathematical arias model
Authors: Rochmad  , Dewi (Nino Adhi) N R , Noviyana I N 
Published: July 2020

Abstract
This research is motivated by the low mathematical-communication-ability of junior high school students. This study aims to determine whether the use of the ethnomathematical ARIAS-model is effective in mathematical-communication-ability. The study design was a pretest-posttest-control-group-design. The population in this study were eighth grade students of SMP Negeri 1 Karangampel Indramayu. The research sample consisted of 57 students (27 students in the experimental class and 30 students in the control class). Data collection techniques using pretest and posttest; pretest to know students ‘initial mathematical-communication-ability before and posttest to find out students’ last mathematical-communication-ability after teaching and learning. Early mathematical-communication-ability was also used to determine the normality and homogeneity of the experimental and control class. Data were analyzed using parametric analysis of mean test, proportion test, average difference test, proportion difference test, and gain difference test. The results of this study indicate that the ARIAS-model with ethnomathematics nuances is better than problem-based learning in mathematical-communication-ability.
Gender perspectives on mathematical connection ability in PACE learning model
Authors: Dewi N R , Mulyono  , Pratama M F R , Amidi  , Azmi K U , Munahefi D N 
Published: July 2020

Abstract
The purpose of this research was to proving effectiveness PACE learning model and analyze the ability of students’ mathematical connections in terms of gender. This type of research is mixed methods. The quantitative research design used is true experimental design. This research was conducted in one of the High Schools in Banyumas in the academic year 2018/2019. Two sample groups (experiment group and control group) were selected randomly. An experiment group was taught by using PACE learning model, while the other group (control group) was taught by using Problem Based Learning Model. The purposive sampling technique consists of 6 subjects were chosen, 3 male and 3 female students. Data collection techniques through tests and interviews. Data analysis through the stages of data reduction, data presentation and drawing conclusions. The results showed that female subjects fulfilled indicators of the relationship between topics in mathematics and indicators of mathematical relationships in other fields, as well as indicators of mathematical relationships in everyday life one subject did not fulfill; male subjects meet indicators of the relationship between topics in mathematics and indicators of mathematical relationships in everyday life, as well as indicators that connect mathematics in other fields that are not fulfilled by one subject
Learning mathematics assisted by adobe flash software to improve mathematical reasoning ability students ongeometry concepts
Authors: Nurjanah  , Yuliardi R , Luthfi A F 
Published: July 2020

AbstractThis research is motivated by the very importance of integrating technological innovation in learning. This research aims to develop interactive learning based on Adobe Flash CS6 in order to improve students’ mathematical reasoning abilities. The method used in this study is the Research and Development (R&D) method with steps (1) self-evaluation, (2) prototyping (expert judgment review, one-to-one, and small group), and (3) fieldtest. The population in this study was grade VII students of SMPN 2 Luragung and SMPN 1 Maleber, Kuningan District, West Java. Samples were selected through a purposed random sampling technique. The experimental class was taught using adobe Flash-based interactive learning media, while the control class was taught using classical learning. Data obtained by using the pre-test and post-test to get data on the results of increasing students’ mathematical reasoning abilities. Based on the results of data analysis, it is obtained: The development of adobe flash-based mathematics learning media has fulfilled the effective and valid criteria as suitable learning media applied in improving students’ mathematical reasoning abilities. Based on field tests there is a significant increase in the average between students who use Adobe Flash media and those who do not use. In other word Adobe Flash based learning media can effectively improve students’ reasoning abilities in geometrical concepts.
Etnomathematics of batik motifs in problem based learning
Authors: Zaenuri  , Purwanti D , Asikin M 
Published: July 2020

Abstract
This research aims to analyze effectiveness of ethnomathematics with Solotigo Batik Motifs in Problem Based Learning model. This true experimental research desin used cluster random sampling to take the sample. The sample was taken from SD N Siderejo Lor 07, Salatiga, as experimental class and SD N Sidorejo Lor 03 Salatia as control group consisted of 74 students. The data collecting techniques were observation, documentation, and test. The data was analyzed by One Sample T – Test, proportion test, and Independent Sample t-test. The findings showed that ethnomatematics with Salatiga batik motifs in problem based learning model was effective. It was shown by (1) the average ethnomatematics with Salatiga batik motifs in PBL model was higher than 75.0. (2) the proportion of passing grade by using ethnomatematics with Salatiga batik motifs in PBL model could achieve classical passing grade, 75%. (3) The average of ethnomatematics with the batik motifs in PBL was higher than PBL model. (4) the average of variance by using ethnomatematics with Salatiga batik motifs in PBL was higher than PBL model. It could be concluded that ethnomatematics with Salatiga batik motifs in PBL model was effective.
Implementation of APOS theory to encourage reflective abstraction on Riemann Sum
Authors: Nisa LC , Waluya SB , Kartono  , Mariani S 
Published: July 2020

AbstractThe purpose of this study is to explore the implementation of APOS (Action-Process-Object-Schema) in first-year students at higher education as a basis of instructional learning in Riemann Sum to emerge the reflective abstraction. This is qualitative research, and data were taken by tests, interviews, and observation. To construct the Riemann Sum understanding, students came through the Action by estimating the area under the curve with various shapes, looking for the area under the curve through several partitions, and make repetitions. The Process was built by interiorizing the previous action onnpartitions. The Object was constructed through the encapsulation mechanism by determining the existence and value of the limit for the Riemann Sum. Schemes occurred through thematization by applying Riemann Sum to contextual situations involving functions of distance and time. The results showed that the success of APOS implementation was determined by genetic decomposition, assistance, reinforcement of preconditions and reinforcement of concepts by lecturers. Some effective scaffoldings to help the construction of reflective abstractions in Riemann Sum are worksheets and guided question from educator.
An analysis of student error types in solving mathematics problem on the implementation of osborn simple feedback learning model
Authors: Kartono  , Muttaqi U K , Dwidayati N K 
Published: July 2020

Abstract
This research aimed to find out effectiveness of Osborn Simple Feedback learning model implementation in solving mathematics problem and to analyse the error types of the students. This mix method research combined two approaches, by having sequential explanatory design (based on quantitative – qualitative orders). The population consisted of VIII graders of MTs Al – Ma’arif Rakit in academic year 2018/2019. The quantitative research side, the sample was collected through random sampling and it was gained two classes with significantly different initial problem solving. The quantitative data analysis was based on one sample t test, proportional test, and average variances of two independent sample test. The qualitative aspect of this study was done by taking the subjects based on purposive sampling. 6 students of experimental group were chosen based on their problem solving skill started from high, moderate, and poor categories. Based on qualitative analysis, it could be concluded that problem solving skill of the students was varied. It depended on the error types. The findings also showed that the implementation of Osborn Simple Feedback model was effective to problem solving skill of the students. The mathematics problem solving skill of the students on each category and research subject was varied.