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931	Mathematics	ABS-704
Geogebra Application for Quadratic Functions Tina Sri Sumartini (a*), Iyam Maryati (b) Institut Pendidikan Indonesia Abstract The purpose of this study is to analyze the use of geogebra applications in mathematics learning on quadratic function material. In addition, it needs to be seen how respondents conceptual and procedural understanding of the quadratic function material. This research uses quasi-experimental by taking a sample of 80 respondents. Samples were given treatment with the use of geogebra applications in mathematics learning with quadratic function material. Data analysis was performed using SPSS. The results showed that the use of geogebra applications was effective in developing respondents conceptual and procedural understanding of quadratic function material. Keywords: Geogera Application, Quadratic Function Share Link | Plain Format | Corresponding Author (Tina Sri Sumartini)

932	Mathematics	ABS-961
Mathematical Communication Based on Kolb Learning Style Assimilator and Accommodator Types Evi Rohmanawati (a*), Tri Atmojo Kusmayadi (b*), Laila Fitriana (c*) a) Postgraduate Program of Mathematics Education, Universitas Sebelas Maret, Jalan Ir. Sutami No. 36A, Surakarta 57126, Indonesia *evirohmanawati2[at]gmail.com b) Faculty of Mathematics and Natural Sciences, Universitas Sebelas Maret, Jalan Ir. Sutami No. 36A, Surakarta 57126, Indonesia *tri.atmojo.kusmayadi[at]gmail.com c) Faculty of Teacher Training and Education, Universitas Sebelas Maret, Jalan Ir. Sutami No. 36A, Surakarta 57126, Indonesia *lailafitriana_fkip[at]staff.uns.ac.id Abstract Mathematical communication is very needed in the learning process, through communication students can filter ideas and clarify understanding. Learning style can lead students to an optimal condition in processing information and assist students in learning. The purpose of this study is to describe about mathematical communication based on Kolb learning style assimilator and accomodator types. This study used descriptive qualitative method. The subject of the study consisted 2 students of Junior High School in Sleman which selected using purposive sampling. The research instruments were questionnaire and essay test. Data validity used method triangulation. Data analyses were done through data collection, data reduction, data presentation and conclusion. The results show that subject of the accomodator type can explain ideas and situations in writing, can express mathematical ideas in the form of images and can arrange arguments and generalizations. While the assimilator type subject can express mathematical ideas in the form of image only if there are commands in the problem and can construct arguments but cannot make generalizations. Theoretically, this research shows that there is a match between learning style and students mathematical communication. Keywords: Mathematical Communication; Learning Style Share Link | Plain Format | Corresponding Author (Evi Rohmanawati)

933	Mathematics	ABS-962
Analysis of Irregularities in Mathematics Score Erdawaty Kamaruddin*, Erwin Sulaeman, Liza Nurita, and Lisa Dwi Ningtyas Faculty of Engineering, Universitas Negeri Jakarta, Indonesia *erda_kamaruddin[at]unj.ac.id Abstract Mathematics is very functional to sharpen the logic of students thinking to reason correctly. However, for some students, mathematics becomes very frightening because it is considered too challenging to learn. Based on these assumptions, it’s necessary to conduct a study of the acquisition of mathematical scores, bearing in mind that each student, starting from the basic education level up to tertiary institutions, is required to follow the subject. A students math score can be by the students actual ability, but there is often an imbalance between the score and the students ability. Students who can get low scores and students who are less able to get high scores. This similar condition is called an improper score. The purpose of this study was to analyze the irregularities of mathematical scores in the no penalty sampling model. The research data were analyzed based on classical measurement theory with experimental method. The results of the data analysis showed that the fairness index of the five-choice multiple-choice test scores was higher than the three options. Thus it can be concluded that the scores of students on the five-choice multiple-choice test are more reasonable compared to the score of students on the three-choice multiple-choice test. Keywords: mathematical score, number of options, improper score Share Link | Plain Format | Corresponding Author (Ir. Dra. Erdawaty Kamaruddin, M.Pd.)

934	Mathematics	ABS-451
Technological pedagogical content knowledge analysis W Susilawati, T K Rachmawati and A R Faiz Departemen Mathematics of Education, UIN Sunan Gunung Djati Bandung Abstract Nowadays professional teachers are required to have good knowledge regarding content, pedagogy and technology. This paper is to determine the ability of technological pedagogical content knowledge of prospective mathematics teacher in conducting research in schools using qualitative descriptive methods. The subject involved five prospective mathematics teacher who were conducting research for a thesis at a Junior High School in Bandung, Indonesia. Instrument: questionnaire, observation and interview format. Data analysis; aspects of CoRe, learning implementation plan, implementation of learning, use of information technology-based learning media, learning evaluation, PaP-eRs. The results showed the ability of technological pedagogical content knowledge of prospective mathematics teacher in a well category. Students are already skilled at outlining big ideas. Prospective teachers able to using learning implementation plans and accordance with 2013 curriculum guidelines. Prospective teachers have not able to make PaP-eRs as a reflection material, and facilities constraints to support the implementation of learning using ICT. Keywords: Pedagogical Content Knowledge, Mathematic Education, Multimedia Learning Share Link | Plain Format | Corresponding Author (Wati Susilawati)

935	Mathematics	ABS-963
Using the Many Faceted Rasch Model to Eavluate Expert Assessments on the E-Learning Classroom Environment and Knowledge Transformation Instrument (ELLET) Wardani Rahayu and Erwin Sulaeman Universitas Negeri Jakarta Abstract The learning of future teacher candidates requires the cognitive and emotional involvement of teacher individually and collectively, all of this happens in the education policy environment or classroom culture in certain schools. To reflect the culture of good quality and its influence on the quality of future teacher candidates, development of ELLET. As part of the development phase, ELLET items were tested on experts from various backgrounds in the scientific field. The purpose of this study was to evaluate the quality of expert based assessment on the ELLET instrument. The analysis was conducted by 28 experts who assessed 56 ELLET items with the Many Faceted Rasch Model approach. The findings of the analysis provide evidence of the quality of the response rating acceptable to experts, model fit criteria are met with a high reliability index. Detection of the type of severity of the expert with various spectrums is examined based on the characteristics (gender, age, and scientific field) and item difficulties. Information on interesting findings of this study as an important source of evidence of internal validity and the use of the Many Faceted Rasch Model in evaluating objective assessment. Keywords: Many Faceted Rasch Model, Expert Assessments, ELLET Share Link | Plain Format | Corresponding Author (Wardani Rahayu)

936	Mathematics	ABS-196
Android Desmos in Mathematical Reasoning Abilities Winda Muhdiana, Rahayu Kariadinata, Yayu Nurhayati Rahayu, Hamdan Sugilar UIN Sunan Gunung Djati Bandung Abstract The purpose of this present study is to find out that Desmos android can improve mathematical reasoning abilities. The method used was an Experiment with the Nonequivalent Control Group Design research design. Research subject is one of the High Schools in Bandung, West Java. This study uses two classes, namely class using android Desmos and control class. The instrument used in the study is a mathematical reasoning ability test. Based on the results of the study stated that the average value of the gain test mathematical reasoning ability of the Desmos class with a value of 0.47 is higher than the control class with a value of 0.38. This means that classes that use Android Desmos have a high increase in reasoning abilities from the control class. Keywords: Android Desmos, Mathematical Reasoning Share Link | Plain Format | Corresponding Author (Winda Muhdiana)

937	Mathematics	ABS-455
TECHNOLOGICAL ANALYSIS OF PEDAGOGICAL CONTENT KNOWLEDGE STUDENTS OF MATH PROSPECTIVE TEACHERS W Susilawati1, R Kariadinata, and A R Salam Departemen Mathematics of Education, UIN Sunan Gunung Djati Bandung. Abstract The purpose of this paper is to analyze the technological pedagogical content knowledge abilities of prospective mathematics teachers using qualitative descriptive methods. This research was conducted in five schools, namely SMPN 1 Cileunyi Bandung Regency, SMPN 17 Bandung, SMAN 26 Bandung, SMAN 27 Bandung, and MAN 2 Kota Bandung Indonesia. Research subjects were five prospective mathematics teachers. The research instrument used was the observation format, documentation analysis guidelines for CoRe documents, PaP-eRs, and RPPs, questionnaires, interviews. Data analysis includes data collection, data reduction, data presentation and data verification. The findings: (1) the ability of prospective teachers to plan learning through CoRe documents is in the good category; (2) the ability of prospective teachers to develop PaP-eRs is in the good category; (3) the ability of prospective teachers to implement the curriculum through the making of lesson plans and implementing learning is included in the category in accordance with the standards of the education process; (4) prospective teachers have been able to integrate technology in mathematics learning based on a technological pedagogical content knowledge framework; (5) the obstacles in integrating technology in mathematics learning are teacher candidates lacking mastery of the technology used, inadequate school facilities, and students are less accustomed to using technology in the learning process. Keywords: Pedagogical Content Knowledge, Mathematic Education, Multimedia Learning Share Link | Plain Format | Corresponding Author (Wati Susilawati)

938	Mathematics	ABS-456
ADAPTIVE REASONING BASED ON MICROSOFT MATHEMATICS W Susilawati, T Widiastuti, and A R Joe Departemen Mathematics of Education, UIN Sunan Gunung Djati Bandung, Jl. Cimencrang Gede bage Bandung, Indonesia. Abstract The quality of adaptive reasoning in solving mathematical problems that is still low has an impact on other mathematical competencies in solving story problems. The demands of professional teachers to design learning that can facilitate all students to develop their potential. The purpose of the paper is to analyze the differences in the improvement of adaptive reasoning abilities between students who obtain learning, solve, create, and share learning aided by Microsoft Mathematics and conventional learning. The method used is a quasi-experimental design with Nonequivalent Pretest-Posttest Control Group Design. Involving two purposive sampling classes, class X Madrasah Aliyah Negeri II Bandung Indonesia students, test instruments for the story about adaptive reasoning. The analysis uses independent T test data. Findings: There is a difference in the increase in adaptive reasoning skills between students who obtain learning, solve, create, and share with Microsoft Mathematics aided better than conventional learning. Students difficulty in solving story problems adaptive reasoning abilities can be minimized by getting used to practicing non-routine story problems. Microsoft Mathematics-aided search, solve, create, and share learning requires students to submit conjectures, give reasons for answers, draw conclusions from statements, and students are able to find patterns of a variety of mathematical problems through multi-interactive media. Keywords: ADAPTIVE REASONING, Mathematic Education, Multimedia Learning Share Link | Plain Format | Corresponding Author (Wati Susilawati)

939	Mathematics	ABS-458
Realistic Mathematics Education on Teaching Functions to Develop Algebraic Thinking Skills Mimi Nur Hajizah, Dwi Antari Wijayanti, Darhim Universitas Negeri Jakarta Universitas Pendidikan Indonesia Abstract This study discusses how the notion of a function can be developed for high school students through the use various contexts that are close to students’ daily life or make sense to them. The Realistic Mathematics Education approach provides the framework that guides the discussions. The concept of function has become one of the basic ideas in modern mathematics that underlies almost all disciplines. But it proved to be one of the most difficult concepts in learning mathematics. The concept of function is often taught without connecting to everyday context. Formal mathematical symbolism of concept such as f(x) introduced prematurely to students which can lead to learning obstacle about functions. The study provides mathematics educators a hypothetical learning trajectory as a platform which facilitates a Realistic Mathematics Education approach to teaching function especially to develop algebraic thinking skills. Keywords: realistic mathematics education, function, algebraic thinking Share Link | Plain Format | Corresponding Author (Mimi Nur Hajizah)

940	Mathematics	ABS-465
MATHEMATICS COMMUNICATION BASED SPARKOL VIDEOSCRIBE W Susilawati, Juariyah, E Farlina, R L Ariani and H Lulu Departemen Mathematics of Education, UIN Sunan Gunung Djati Bandung. Abstract Improving mathematical communication skills is through Interactive Learning based on Sparkol VideoScribe Cooperative Settings. The purpose of this paper is to analyze the differences in the improvement of mathematical communication skills between students who are learning based on Sparkol VideoScribe and conventional. There is a difference in the achievement of mathematical communication skills between students learning with Sparkol VideoScribe and conventional based on Early Knowledge of Mathematics in the high, medium, and low categories. This study uses a quasi-experimental method with non-equivalent Control Group Design. The purposive sampling technique uses two experimental class samples for learning based on Sparkol VideoScribe and a control class for conventional learning. The instrument used was a test of mathematical communication skills, an initial knowledge of mathematics test. Data analysis using independent T test and two-way ANAVA. Findings: There are differences in the improvement of mathematical communication skills between students who study using Sparkol VideoScribe and conventional. There is a difference in the achievement of mathematical communication skills between students who study Sparkol VideoScribe and conventional learning based on initial knowledge of mathematics in the high, medium and low categories. Sparkol VideoScribe based learning can facilitate the process of construction, interaction, reflection, material so that it is easy to understand and improve students mathematical communication skills. Keywords: Mathematic Communication, Mathematic Education, Multimedia Learning Share Link | Plain Format | Corresponding Author (Wati Susilawati)

941	Mathematics	ABS-721
The Impact of Electronic Puzzle on Two-Dimentional Shapes Grouping Lesson Sri Rahayu (a*), Iskandar Ladamay (b) a) Elementary School Teacher Education Study Program, Universitas Kanjuruhan Malang Jalan S. Supriadi 48, Malang 65148, Indonesia *srisk[at]unikama.ac.id b) Civic Education, Universitas Kanjuruhan Malang *Corresponding Author E-mail: srisk[at]unikama.ac.id Abstract Mathematics as subject matter has abstract object characteristics, often causes student in elementary school who in the stages concrete operations thinking to have difficulties. One alternative to overcoming mathematics abstract is by developing learning resources that attract students attention, so the material can be delivered and mastered by students thoroughly. This research was conducted with focus on the development E-puzzle media to help students understand abstract flat-build material to be more concrete. This research uses a quantitative approach with the Quasi Experiment method. The aim is to determine the effect of the use of E-puzzle media to improving student learning achievement. The sample uses a random technique by lottery. The results showed that there was an influence of the use E-puzzle to increase student learning achievement in student grade II SDN Gadang 01 Malang City. This can be known based on the value of t arithmetic > t table (2,949 > 1,992) meaning that there are differences in learning achievement between students taught using E-puzzle and not. Through these results expected that elementary school teachers can develop themselves in use and development electronic-based media and teaching aids in their classroom learning. Keywords: Electronic puzzle, two-dimentional shapes grouping Share Link | Plain Format | Corresponding Author (Sri Rahayu)

942	Mathematics	ABS-979
Mathematical connection based on personality types Annita Nur Kusumastuti (a*), Budiyono (b*), Diari Indriati (c*) a) Postgraduate Program of Mathematics Education, Universitas Sebelas Maret, Jalan Ir. Sutami No. 36A, Surakarta 57126, Indonesia *annitanur[at]gmail.com b) Faculty of Teacher Training and Education, Universitas Sebelas Maret, Jalan Ir. Sutami No. 36A, Surakarta 57126, Indonesia *budiyono53[at]gmail.com c) Faculty of Mathematics and Natural Sciences, Universitas Sebelas Maret, Jalan Ir. Sutami No. 36A, Surakarta 57126, Indonesia *diari_indri[at]staff.uns.ac.id Abstract Mathematics is related to the connecting ability. The students need to connect each mathematical topic, the other learning subjects, and various daily problems. The personality type of sensing intuition is an ability to process the received information. This study is aimed to describe the student’s ability in mathematical connecting identified by personality types of sensing intuition. This research used descriptive qualitative method. The subjects of the study were two junior high school students in Surakarta, chosen by using purposive random sampling. The research data were collected by using questionnaire and essay test. The method of data validity used was the triangulation method. The data were analyzed by series of process; collecting, reducing, presenting and conclusion. The result of the study shows that the student with the intuition type have more mathematical connecting ability than the student with the sensing type. Based on the result of the study, it can conclude that the students who can relate each topic in mathematics may not have the ability to relate each topic on the other learning subjects. Most of the students were only implementing the formula taught at school, they did not try to explore the mathematical connecting ability. Keywords: mathematical connecting; personality types Share Link | Plain Format | Corresponding Author (Annita Nur Kusumastuti)

943	Mathematics	ABS-469
IMPROVING UNDERSTANDING OF ADDITION AND SUBTRACTION CONCEPT IN FIRST GRADER THROUGH UTILIZATION OF FLIPPED CLASSROOM a) Tunjung Susilowati, b)Rasmita, c)Mohamad Syarif Sumantri, d)Arita Marini a) tunjung.susilowati[at]sekolahkristencalvin.org b) rasmita.unj.dikdas[at]gmail.com c) mohamadsumantri[at]gmail.com d) aritamarini[at]unj.ac.id Abstract This class action research was conducted to see the effectiveness of the flipped classroom method on improving the concept of addition and subtraction. Flipped classroom method was chosen because it is in accordance with the current development of digital learning media that utilizes technology in learning. Flipped classroom performed by providing learning videos that can be viewed online by students at home then followed by problem solving activities through discussion activities in class with mentoring provided by the teacher. Based on this study an increase of 28.6% was obtained so that 83.3% of 42 students scored more than the minimum competencies criteria. The implications of this research can be utilized in other mathematical learning concepts. Keywords: flipped classroom, teaching mathematics, class action research Share Link | Plain Format | Corresponding Author (Tunjung Susilowati)

944	Mathematics	ABS-987
Welfare and natural disasters in Indonesia: accentuate or attenuate? Ari Purwanto Sarwo Prasojo*, Gusti Ayu Ketut Surtiari, Puguh Prasetyoputra Research Center for Population, Indonesian Institute of Sciences Abstract The new paradigm of disaster management in Indonesia highlights reducing risk than focusing on response. However, the rising number of disasters in Indonesia exerts significant economic loss and number of victims. Previous studies tend to focus on the vulnerability assessment by proposing economic growth as one of the instruments to reduce risk. Based on evidence of disasters in Indonesia, we argue that understanding the contribution of economic growth to risk reduction is important. The question is whether catastrophe in Indonesia only occurs in the low economic growth or also severely affect middle to high economic growth areas. We implement the concept of welfare and risk reduction as an approach to analyse disaster and welfare data with a focus on flood events in 2014-2018. We obtained the data from BNPB and Statistics Indonesia. We fitted a multivariable negative binomial regression with person losses as the outcome and provincial Human Development Index (HDI) and provincial gross domestic product (GDP). The results suggest that Provincial HDI is negatively associated with person losses (P < 0.05). However, Provincial GDP was also found to be positively associated, albeit less strongly, with person losses (P < 0.10). These associations bring about potentially significant policy implications. Keywords: natural disasters, welfare, economic loss, negative binomial regression, Indonesia Share Link | Plain Format | Corresponding Author (Puguh Prasetyoputra)

945	Mathematics	ABS-991
Written Mathematical Communication Based on Rational Personality Indah Dwi Mulyastuti (a*), Budiyono (b), Diari Indriati (c) a*) Postgraduate Program of Mathematics Education, Universitas Sebelas Maret, Jalan Ir. Sutami No. 36A, Surakarta 57126, Indonesia *indahdwimulyastuti[at]gmail.com b) Faculty of Teacher Training and Education, Universitas Sebelas Maret, Jalan Ir. Sutami No. 36A, Surakarta 57126, Indonesia *budiyono[at]staff.uns.ac.id c) Faculty of Mathematics and Natural Sciences, Universitas Sebelas Maret, Jalan Ir. Sutami No. 36A, Surakarta 57126, Indonesia *diari_indri[at]staff.uns.ac.id Abstract Rational personality is one of personality types according to David Keirsey. Rational personality is a characteristic of students who like explanations that are based on logic and have a high curiosity. For this reason, rational personality can affect mathematics learning and students mathematical communication skills in writing. The written indicators of mathematical communication in this research are interpreting ideas, symbols, terms and mathematical information in writing and writing ideas for solving strategies with their own language. Therefore, rational personality is considered as one type of personality that students should have. This study was conducted in a descriptive qualitative manner aimed at analyzing mathematical communication skills of students who have rational personalities. The research subjects were 20 students in class VIII of SMP Negeri 1 Purwodadi. Data collection techniques through questionnaires, test descriptions and interviews. The results of this study are students who have rational personalities able to interpret ideas, symbols, terms and mathematical information have a percentage of 30% in the low category and 90% of students who have rational personalities are able to write mathematical completion strategy ideas with their own language. However, there is a tendency not to write down reasons in answering questions. Keywords: Written mathematical communication; Rational personality Share Link | Plain Format | Corresponding Author (Indah Dwi Mulyastuti)

946	Mathematics	ABS-737
Long exact sequence of U-extension modules Yudi Mahatma, Ibnu Hadi, Bagus Sumargo Universitas Negeri Jakarta Jalan Rawamangun Muka, Jakarta Timur, Indonesia yudi_mahatma[at]unj.ac.id ibnu_hadi[at]unj.ac.id bagussumargo[at]unj.ac.id Abstract Let R be commutative algebra with unit element. Given R-modules M and N, and any submodule U of M, it has been shown that there always exists the k-th U-extension module of N by M for every positive integer k. Further, given any short exact sequence of R-modules and R-module homomorphisms, we can obtain an exact sequence of U-extension modules of N by M. Keywords: algebra, module, extension module, exact sequence Share Link | Plain Format | Corresponding Author (Yudi Mahatma)

947	Mathematics	ABS-742
Generalized Linear Mixed Models by Penalized Lasso in Modeling the Scores of Indonesian Students Vera Maya Santi(a*), Khairil Anwar Notodiputro(b), Bagus Sartono(b), Widyanti Rahayu(a) a) Program Studi Statistika, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Negeri Jakarta *vmsanti[at]unj.ac.id b) Departemen Statistika, Fakultas Matematika dan Ilmu Pengetahuan Alam, Institut Pertanian Bogor Abstract The Generalized linear mixed model (GLMM) is an extension of the Generalized linear model by adding random effects to linear predictors to accommodate clustered or overdispersion. Severe computational problems in the GLMM modeling cause its use restricted for only a few predictors. When many predictors are available, the estimators become very unstable. Therefore, the procedure for selecting relevant variables is important in modeling. The use of penalty techniques for selecting variables in mixed models is still rarely applied. In this article, penalized Lasso approach are proposed to handle these kinds of problems. The proposed methods select variables and estimate coefficients simultaneously in GLMM. Based on the Akaike Information Criterion (AIC), Bayesian Information Criterion (BIC) and standard error criteria, it was found that glmmLasso has a better performance than GLMM. For the factors affecting Indonesian’s student scores, where glmmLasso produces three important covariates for the GLMM model while GLMM without penalized Lasso has five covariates which mean that the GLMM model is more complex than glmmLasso. Gender, school quality based on National Examination scores and the opportunity for students to investigate to test their ideas are important covariates as factors that influence the score of Indonesian students. Keywords: Generalized Linear Mixed Models; glmmLasso; Penalty; Variable Selection;the score of Indonesian students Share Link | Plain Format | Corresponding Author (Vera Maya Santi)

948	Mathematics	ABS-998
MODELLING OF WEST JAVA INFLATION WITH SPATIAL DURBIN MODEL (SDM) Vera Maya Santi(a*), Anik Djuraidah(b), I Made Sumertajaya(b), Anwar Fitrianto(b), Widyanti Rahayu (a) a)Program Studi Statistika, FMIPA Universitas Negeri Jakarta *vmsanti[at]unj.ac.id b)Departemen Statistika, FMIPA Institut Pertanian Bogor Abstract Inflation in Indonesia, in general, can be caused by a combination of various factors both in terms of demand, supply, and expectations. The contribution of each factor that influences inflation is not always the same from time to time. Gordon (1997) explains the determinants of inflation from these three sides, namely demand, supply and expectations. The importance of expectations in influencing inflation was also stated earlier by Chopra (1985). In this study, spatial durbin for panel data with fixed effects in modelling inflation in the West Java province. The results show that Minimum Work Wage, percentage of poor population, Gross Regional Domestic Product (GRDP), spatial lag of poor population, and spatial lag of GRDP have a significant influence on the Durbins panel spatial model. There is an adjacent regional effect on inflation in the West Java province based on the value of the lambda obtained. Based on the criteria R-square of 94.29% it can be concluded that the SDM panel data model has a good performance in explaining the diversity of data. The AIC and BIC criteria also show that the SDM panel data model is well applied in modelling Regency/City inflation in West Java province. Keywords: Inflation; Spatial Durbin Model; Moran’s I; GRDP; AIC; R-square Share Link | Plain Format | Corresponding Author (Vera Maya Santi)

949	Mathematics	ABS-496
INFLUENCE OF CONTEXTUAL-METACOGNITIVE ON SELF-REGULATORY STRATEGIES STUDENTS IN MATH IV Nanang Department of Informatics, Garut Informatics Engineering School (Sekolah Tinggi Teknologi Garut) Abstract The problem in this study is the low Self-Regulatory Strategies (SRS) of students in Mathematics IV. The purpose of this study is to determine the differences in SRS between students who get a contextual approach with a metacognitive strategy (PKM), contextual approach (PKT), and conventional approach (PKV). This research is an experiment. The subjects in this study were students of Civil Engineering STT Garut semester 4 of 2018 which consisted of three classes (groups). The experimental group-1 was given PKM, the experimental group-2 was given PKT, and the control group was given PKV. The instrument used was a SRS scale based on a Likert scale. Data analysis was performed with ANOVA test. The main results of this study are students who get PKM and PKT significantly better SRS than students who study with PKV. Based on these results, the researcher proposes: (1) PKM and PKT approaches should continue to be developed and used as an alternative choice for teachers in daily IV Mathematics lectures and (2) the application of PKM and PKT approaches becomes input material for policy makers in developing intelligence potential college student. Keywords: Contextual-metacognitive, self-regulatory strategies (SRS), Mathematics IV Share Link | Plain Format | Corresponding Author (Nanang Nanang)

950	Mathematics	ABS-763
Household Behavior Towards Shallow Groundwater Saving in Pekanbaru City Fakhri Rafi (a), Mahawan Karuniasa (a*), Abdurrachman Asseggaf (b*) (a) School of Environmental Science, Universitas Indonesia, Indonesia (b) Department of Geological Engineering, Faculty of Earth and Energy Technology, Trisakti University, Indonesia Abstract Growth in household activities that increase water resource needs can be incompatible and their availability can be threatened. Limited water supply makes groundwater a primary need because it is easily exploited and practical. This paper attempts to understand the behavior of shallow groundwater saving by households and to observe the influence between knowledge, attitudes, and practice with their behavior. This research was conducted in the Bukit Raya Subdistrict in Pekanbaru City with 113 respondents, analyzed using a quantitative approach (SPSS). The results showed that knowledge, attitudes, and practice had a positive influence of 32.4% on shallow groundwater saving behavior. This research concludes that knowledge is the most influencing shallow groundwater saving behavior seen from the influence of attitude and practice. Keywords: Behavior; Knowledge; Attitude; Practice Share Link | Plain Format | Corresponding Author (Fakhri Rafi)

951	Mathematics	ABS-252
Determination of the optimal solution to the assignment problem of lecturers in Higher Islamic Education using the new revised zero’s to one’s method Elis Ratna Wulan, Yuli Yulianti, Saca Suhendi UIN Sunan Gunung Djati Bandung Abstract This study discusses about the optimal solution of the assignment problem of minimization cases by using New Revised Zeros to One’s Method (NRZOM). This method was formed with the aim of getting an optimal solution by converting zero into one that was completed with a 5 x 5 data size which aims to minimize the total costs incurred by an Islamic Higher Education. Completion with NRZOM begins by subtracting each row from the smallest element, then adding a cost of one to all elements, after each row has a value of one, perform assignments in condition one so that each lecturer has their own subject matter. Based on the results of this study it was found that, Subject Matter 1 was assigned to Lecturer E, Subject Matter 2 was assigned to Lecturer A, Subject Matter 3 was assigned to Lecturer D, Subject Matter 4 was assigned to Lecturer C, and Subject Matter 5 was assigned to Lecturer B. Thus the assignment was: M_1→2,M_2→1,M_3→3,M_4→2,M_5→6. From the results of the assignment, the optimal solution for the minimum cost is obtained 14. Keywords: Optimal Solution, New Revised Zero’s to One’s Method, Lecturer Assignment, Minimum Cost Share Link | Plain Format | Corresponding Author (Elis Ratna Wulan)

952	Mechanical Engineering	ABS-512
Co-firing Characteristics of Wood Pellets on Pulverized Coal Power Plant Nur Cahyo (1*); Hamdan Hartono Alif (1); Indra Ardhanayudha Aditya (1); Hermawan Donny Saksono (2) (1) PLN Research Institute Jl. Durentiga No. 102, Jakarta 12760, Indonesia *nurcahyo3[at]pln.co.id (2) PT Pembangkitan Jawa Bali Jl. Ketintang Baru No. 11, Surabaya 60231, Indonesia Abstract Co-firing testing of the wood pellets was carried out in Pulverized Coal Boiler type tangential firing with a capacity of 315 MWe to determine the effects on the performance, emission, and characteristics of the operational boiler parameters such as mill outlet temperature (MOT) and furnace exit gas temperature (FEGT). Fuel was mixed on stockpile with a fuel composition of 5 % wood pellets and 95 % coal. Fuel was initially filled in four bunkers for each mill operated. The co-firing testing was carried in six hours and the data was collected for four hours after the stabilization period. To observe the further impact on the performance, emission and characteristics of operational boiler parameters, two different fuel (100% coal fuel and 5% wood pellet – 95% coal fuel) were set up through the boiler. The result shows that co-firing by 5 % of wood pellets contributed to the decreasing FEGT by 15 0C from 1,192 0C to 1,177 0C equal to 1.27 % lower than the existing condition. The mill outlet temperature is relatively the same for two types of fuel with mill current slightly increasing by 0.70 Ampere. Emissions of SOx increased by range from 8.22 % to 20.51%. NOx content in flue gas on the air heater inlet side is almost the same of 310 mg/Nm3 and only an increase of 3.62 % on the air heater outlet side. This test also affected specific fuel consumption which has increased by 4.40 % from 0.556 kg/kWh to 0.580 kg/kWh. Keywords: co-firing; wood pellet; FEGT; boiler; spesific fuel consumption Share Link | Plain Format | Corresponding Author (Nur Cahyo)

953	Mechanical Engineering	ABS-768
Improvement in Surface Quality of Milled Aluminum-6061 using Magnetic Abrasive Deburring Mardhiyastuti Aulia Rahma (a), Amira Binti Satrial (b), Kushendarsyah Saptaji (a), Mebrahitom Asmelash (b) (a) Sampoerna University, Faculty of Engineering and Technology, Pancoran, South Jakarta (b) University Malaysia Pahang Abstract The milling process commonly used in manufacturing industry requires good surface finish and high surface quality. The occurrence of burrs formed by plastic deformation in milling operations is regarded as one of the major problems. The milling process especially for ductile materials such as aluminium alloys increases the occurrence of burr which will deteriorate the surface quality. In order to improve the surface finish and surface quality, several finishing and deburring methods can be applied. One of the methods is magnetic abrasive deburring. The magnetic abrasive deburring is a method utilizing magnetic force and abrasive particles. In this study, the effect of abrasives particle compositions in the magnetic abrasive deburring for end-milled slots on Aluminum-6061 alloy are observed. The slots milling experiment was conducted by using semi-CNC milling machine. The slots are subsequently deburred using the mixture of abrasive particle, carbonyl iron, and medium fluid of polypropylene glycol attached to a magnetic rod. The observation aims to find the high surface quality and optimum composition for the mixture. Visual surface analysis shows the optimum compositions of the abrasive mixture are 45% abrasive particles and the carbonyl iron mixture with 55% composed of the medium fluid. Keywords: Magnetic abrasive deburring, Al-6061, Surface quality Share Link | Plain Format | Corresponding Author (Mardhiyastuti Aulia Rahma)

954	Mechanical Engineering	ABS-773
Effects Current and Distance Nuggets of Micro Resistance Spot Welding on Battery Lithium and Stainless Steel SUS 304 A.Sifa*, B. Badruzzaman, F. Dionisius, E. Wrisaba Politeknik Negeri Indramayu Abstract Micro resistance spot welding is welding that is widely used in welding the cylindrical lithium battery 18650 because the process is easy. Stainless Steel SUS 304 with a thickness of 0,2 mm is used as a connection plate and the lap joint is a connection that is used on the lithium battery because the connection form is designed to facilitate the welding process, this study purpose to know the effects of nuggets distance and current, The method in this study is the simulation of static and experimental with parameters of currents 14 A, 16 A, 18 A and the distance of nuggets 12 mm, 8 mm, and 4 mm, measure the HAZ and nugget from welding are seen using a digital microscope with a magnification of 100 times, and shear test with 100 N / min load. The simulation and experimental results show the same trend, welding with a 4 mm electrode distance has maximum stress. The area of HAZ widest on the current 14 A have 1,8 mm2, and the area of nugget widest on the current 18 A have 0,08 mm2. Keywords: Micro Resistance Spot Welding, Lithium Battery 18650,Stanless Steel SUS 304 Share Link | Plain Format | Corresponding Author (Agus Sifa)

955	Mechanical Engineering	ABS-6
Investigation Of The Draft Tube Variations Against The First Stage And The Second Stage Flow Of Banki Turbine Sirojuddin, Lukman Kusuma Wardhana and Ahmad Kholil Mechanical Engineering, State University of Jakarta, Indonesia Abstract Cross Flow Turbine usually for micro hydro-electrical power plant application especially for the isolated area. Increasing power efficiency still the most interesting topic for researches. There were many methods to increase power efficiency, one of them was to control the inflow of water from the first stage to the second stage of banki blades to be a good flow trajectory and did not strike the shaft using a draft tube. This research aimed to investigate the draft tube length variations against the flow from the first stage to the second stage of Banki turbine, so that good flow trajectory, uniform color velocity contour and not struck the shaft could be obtained. There were 2 variants runner casing and 3 variants length of draft tube, 140 mm, 240 mm, and 340 mm. 2D and 3D geometry were drawn in CAD software, while Flow Simulation test using Solidwork Flow Simulation with a discharge of water 2m^3/min and head 5.5 m. From simulation results, shown the second variant C2-2 with a length of draft tube L = 1,2 D1 = 240 mm was the best flow trajectory from the first stage to the second stage of the blade, good velocity contour and did not strike the shaft. All of those results were expected to increase the power efficiency of the turbine. Keywords: Draft tube; Flow trajectory; Investigation; Power efficiency; Velocity contour Share Link | Plain Format | Corresponding Author (Sirojuddin Sirojuddin)

956	Mechanical Engineering	ABS-774
Experimental Study of Two-Stage Vertical Axis Hydrofoil Water Turbine NACA 64-212 with Variation of Blades number Mohammad Fiqih Fadlil (a), Arasy Fahruddin (a*), Ali Akbar (a) a) Mechanical Engineering Department, Universitas Muhammadiyah Sidoarjo, Jl. Raya Gelam 250, Sidoarjo 61271, Indonesia *arasy.fahruddin[at]umsida.ac.id Abstract Efforts to utilize the potential energy sources of water flow for electricity generation generally using water turbines. One of them is the hydrofoil turbine which can work without any water head, by utilizing the speed of the river flow. This study aims to determine the power and efficiency generated by a prototype hydrofoil water turbine with a multi-stage installation. This experiment used a hydrofoil turbine with NACA 64-212 standard with variations in the number of blades: 4, 5, and 6 blades on the second stage. The experimental results show that the highest total power is 2.5 Watt at the number of blades 6 at a water discharge of 0.057 m3/s. While the greatest efficiency produced was 7.47% with the number of blades 6 at a water discharge of 0.036 m3/s. Keywords: Water turbine; Hydrofoil; Multi-stage; Vertical axis; Blades number Share Link | Plain Format | Corresponding Author (Arasy Fahruddin)

957	Mechanical Engineering	ABS-1034
Design of control system for paving block machine Mokhamad Is Subekti, Fahad Rifai Politeknik Enjinering Indorama Abstract Electrohydraulic block paving molding machine for mass production, needs good control so that the product matches the quality and quantity specified. In this research, an machine control system is produced using electrohydraulics with main hydraulic components: Piston and solenoid valve for press and dies, hydraulic pumps and accesories. The main electrical components: electric motors, three relays, contactors, MCB, three timers (two for piston press and piston dies waiting time) one for compaction time, four limit switches for limiting piston press and dies movement up-down. The results of the design of the control system, tested with a hydraulic step diagram to show the compact and speed of movement. With the mechanism of movement: piston dies down, material is poured into dies, piston presses down pressing, waiting time for compaction of the piston to keep pressing, dies up, followed by press up, press time sufficient, dies down and so on cycle repeatedly . The density and speed settings can be set at the limit switch and timer. Keywords: Electrohydraulic; control system; compact and speed Share Link | Plain Format | Corresponding Author (Mokhamad Is Subekti)

958	Mechanical Engineering	ABS-781
Implementation of VDI 2221 for portable water tank as an auxiliary equipment firefighter motorcycle system to be used on narrow streets in densely populated area. Catur Setyawan Kusumohadi, Basuki Wibawa, Jafar Amiruddin, Pratomo Setyadi, Himawan Hadi Sutrisno, Triyono Universitas Negeri Jakarta Abstract Densely populated area is one of high risk place in term of fire occurrence. Firefighter motorcycle was designed as an alternative solution to suppress the occurred fire disaster. As an moving pump, this motorcycle need a water tank to supply the needed water. The aim of this research is to design an appropriate water tank that can be used in densely populated area with narrow streets. VDI 2221 design method was used to determine the efficient water tank. The mobility, maneuverability and stability were the aspects that determine this equipment can be used or not in the designed area. By using these aspects of design parameters the preliminary layout was established. The strength analysis, structure layout, attachment system was designed and analyzed to determine the definitive layout. The final design result was a portable water tank that can be attached to firefighter motorcycle. Keywords: VDI 2221, portable water tank Share Link | Plain Format | Corresponding Author (Catur Setyawan Kusumohadi)

959	Mechanical Engineering	ABS-786
Analysis Of St-37 Metal Cutting With Machine-Cut Tools Using Oxy-LPG Ade Irvan Tauvana,Widodo, Mokhamad Is Subekti, Syafrizal, Lukman Nulhakim Politeknik Enjinering Indorama Abstract This gas cutting machine is a ST-37 metal cutting tool in a semi-automatic way using LPG and Oxygen gas materials. LPG gas is used with a composition of propane 99,5% and Isobutan 5%. In the process of cutting metal must pay attention to several parameters, namely: metal thickness, oxygen gas pressure and LPG gas and cutting speed. Before cutting down the metal, the preparation stage is done by conditioning the test equipment and work equipment used to collect test data. The method used in this research is to select the type of metal and cutting equipment then do the recording and taking test data. Further analysis and examination are carried out as follows: visual inspection of the results of cutting and flame shape, a better composition results from testing in accordance with applicable rules such as pressure, plate thickness and time of cutting. 99,5% and 0,5% LPG gas composition at gas working pressure: 0.2 kg / cm2; oxygen pressure: 2.5 kg / cm2, cutting distance of 2mm. The results of this test are overall in good condition and no defects occur. Keywords: LPG Gas cutting, Propane, Isobutane, Cutting speed, Oxygen Share Link | Plain Format | Corresponding Author (Ade Irvan Tauvana)

960	Mechanical Engineering	ABS-533
Development of Automatic Storage Retrieval System for Variable Loads Afzeri Tamsir (a*), Feri Siswoyo H.S (b) (a) (b) Mechatronics Engineering, Politeknik Enjinering Indorama Kembang Kuning, Jatiluhur, Purwakarta 41152 *afzeri[at]pei.ac.id Abstract Automated Storage and Retrieval Systems (ASRS) have been widely used in warehousing systems to speed up and save storage space and reduce costs. ASRS is an integrated system that is equipped with a controler and arm for the collection and storage of goods. This paper discusses the results of developing a system for taking and storing goods for various loads. The prototype element consists of a mechanism for retrieving, placing and application for data collection into the database. In this research, the design and development of ASRS was carried out to be applied in the storage of products of various sizes which is suitable for small size industries. The development process where include an investigation of the investigating features that have been developed in the ASRS, operating procedures, hardware selection and software development in accordance with the mechanism designed. Numerical control which moves the carrier element with high resolution is applied to be able to place the load in a variable range positions. Development and testing is carried out to ensure the performance of the tool runs well and the data storage that includes the identification and size of the load can be properly recorded . Keywords: ASRS;Controller;Small Industry;Automation Share Link | Plain Format | Corresponding Author (Afzeri Tamsir)

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