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871	Material Science	ABS-231
TEMPERATURE DEPENDENCE OF THE MECHANICAL BEHAVIOUR OF ZNO-NA2O-P2O5 GLASSES Agus Setyo Budi (a*), Mujadi (b) aDepartment of Physics, Universitas Negeri Jakarta Jl. Pemuda 10, Rawamangaun, Jakarta 13220, Indonesia bDepartment of Physics Education, Universitas Negeri Jakarta Jl. Pemuda 10, Rawamangaun, Jakarta 13220, Indonesia Abstract In this research, we investigate the mechanical behaviour of zinc sodium phosphate glass system with the various concentration of chromium oxide doped. The glass system was synthesized using the melt quenching technique. The concentration of chromium oxide varying from 0.5% to 2.5%. Longitudinal and shear ultrasonic velocities were measured in different compositions of the glass system at temperature range between 270 K and 323 K. From the transit time data and density, we found that all the mechanical behaviour for these glasses decrease as the Cr2O3 content increase, which indicates a weakening of the binding energy in the network. Keywords: Chromium oxide, Ultrasonic velocities, zinc sodium phosphate glass PermaLink | Plain Format | Corresponding Author (Agus Setyo Budi)

872	Material Science	ABS-1000
Mud GasPlay: New Approach of Hydrocarbon Play Muhammad BURHANNUDINNUR Geology Department, FTKE, Universitas Trisakti Abstract A new thinking of gas play in Tawun formation East Java Basin is a result of an integrated research of mud volcano from surface to subsurface data, overpresured and Hele-Shaw analog modeling. The presence of methane gas seepage in the mud volcano proves the existence gas associated with mud and overpressured zones. Analysis of C isotope of samples of gas seepage of mud-volcano indicate thermogenic methane gas at the level of thermal maturity equivalent to the peak of petroleum formation. The overpressured mud zone has a potential to be an unconventional gas reservoir with high gas storage capacity. Mud-gas-play is defined as the accumulated gas which is trapped in the overpressured zone. Gas accumulations have a tendency to be concentrated upper part of overpressure zone. Type of the reservoir and how the gas storage are the differences from the conventional of gas play concept. Reservoir geometry of mud-gas-play is a chamber shaped which cross sediment layer. Gas is trapped in rocks with very low bearing capacity which have high pressure. Two mechanisms of gas trapped in overpressured shale are dissolved and adsorbed. The gas storage capacity of the mud based on adsorption analysis at temperature 65 degree celcius ranges from 812 scf/ton up to 3,217 scf/ton. The unconventional gas reservoirs of overpressured mud zone is proposed as a new hydrocarbon play: mud-gas-play (MGP). Keywords: mud volcano, overpressured, adsorption, mud gas play PermaLink | Plain Format | Corresponding Author (RINI SETIATI)

873	Material Science	ABS-1002
Characteristic Study and Thermal Modelling of Source Rocks in Salawati Basin, West Papua Arista Muhartanto1, 3, Ahmad Helman Hamdani1, Safrizal2, Lili Fauzielly1, Afriadhi Triwerdhana4 3Geological Engineering Department, Faculty of Earth Science and Technology, Trisakti University, Jakarta Abstract Salawati Basin has 0.5 BBO and 0.1 TCFG oil and gas resources respectively. Hydrocarbon is generated from Tertiary and Pre-Tertiary source rock. Several source rock studies have been conducted, such as in Sirga Formation (Late Oligocene), Kais Formation (Middle Miocene), and Klasafet Formation (Late Miocene). Lack of knowledge in characteristics and thermal modelling study or source rock in Sirga Formation and Pre-Faumai, also curiosity to observe basin reverse polarity occurence is intriguing to be researched further. The purposes of this research are to know: a.) Sirga Formation and Pre-Faumai Formation source rock characteristics to generate hydrocarbon in Salawati Basin; b.) Maturity values based on %Ro, Tmax and 1D basin modelling. Research methodology was carried out using petroleum geochmistry analysis, including: TOC, Rock Eval Pyrolisis, kerogen typing, vitrinite reflectance (%Ro) from 9 cutting samples. Based on TOC parameter, organic-rich materials in both formations show good to very good quantity. On the other hand, PY parameter shows fair to good potency quality as source rock to generate hydrocarbon. Kerogen type composition dominated NFA which indicates oxidizing marine or lacustrine depositional environment. Crossplots between HI and Tmax shows kerogen mixture type II/III which indicates transition environment (fluvio-deltaic) depositional environment. Sirga Formation and Pre-Faumai (Oligocene) show low level maturity based on %Ro and Tmax. On the contrary, based on 1D basin modelling maturity of the source rock on Warir-1X well and WIR-1A (outside research area) show higher level maturity (early to mid-mature) since Middle Pliocene and progressed into late maturity stage on oil generation since Early Pleistocene. Depocenter, generally act as mature kitchen where hydrocarbon generated. Basin polarity reversal occurred since Pliocene and changed basin configuration i.e depocenter from on southern area becoming on northern area Keywords: Salawati Basin, characteristics, maturity, 1D basin modelling, basin polarity reversal PermaLink | Plain Format | Corresponding Author (RINI SETIATI)

874	Material Science	ABS-1021
Conceptual Changes in Elementary School Students About The Properties of Water Through The Predict-Observe-Explain (POE) Model Fitri Nurzakiah Fuadi - Wahyu Sopandi - Ghullam Hamdu Pendidikan Dasar Pascasarjana, Universitas Pendidikan Indonesia Pendidikan Dasar Pascasarjana, Universitas Pendidikan Indonesia Pendidikan Guru Sekolah Dasar, Universitas Pendidikan Indonesia Abstract This study aims to get an overview of students conceptual changes about water properties. The study samples were fifth grade elementary school students who had obtained water properties in their schools. The quasi-experimental method was used to obtain the data. This design consisted of two groups namely the experimental group and the control group. The instrument used was a written test with the five-tier test method. KIT IPA was used as a learning media. The experimental class was given a learning treatment with a practicum-based Predict-Observe-Explain (POE) model and the control class did not learn through practicum-based Predict-Observe-Explain (POE) model. The results showed that there were generally significant differences in conceptual changes between the experimental class and the control class. Practical activities using the Predict-Observe-Explain (POE) model were one way to convey the correct concept of the concept of water properties. In the process of mastering the concept, students went through the stages of thinking starting from the stages of predicting, observing and giving an explanation of a phenomenon. This shows that practical activities with the use of the Predict-Observe-Explain (POE) model provided better conditions to provide students with a correct understanding of the concept. Keywords: Conceptual Changes, The Properties of Water, Predict-Observe-Explain Model PermaLink | Plain Format | Corresponding Author (FITRI NURZAKIAH FUADI)

875	Material Science	ABS-510
Sol-gel Technique: Thin Films SnO2 with Doping Indium Syamsul Hakim, Aris Doyan, Susilawati Magister Pendidikan IPA Universitas Mataram Abstract The study of semiconductor material is a basic experiment. This study aims to identify the effect of SnO2 doped Indium sol-gel color and the effect of the number of slicks on the thin film spread evenly on the glass transparent. The variation of SnO2 doping Indium is 0, 5, 10, 15, 20, and 25%. The technique used in making thin films uses the sol-gel spin coating technique. Spin coating is a technique that is simple, economical, and produces a fairly good thin film. The manufacturing process kind of three stages namely substrate washing, sol-gel making, and thin film growth done respectively. The results showed that sol gel with doping variations had different colors, the higher doping percentage, the clearer sol-gel solution was. The coating results of the thin films have increased, the more coated the surface of the layer looks more evenly with the number of 1, 2, 3, and 4 slicks respectively. The increase doping variations influence to the transparent color of sol-gel be increased. The increase number of slick effect to the thin films more thickness and smooth. Keywords: Sol-gel, Spin Coating, thin Films, SnO2, Indium PermaLink | Plain Format | Corresponding Author (Syamsul Hakim)

876	Material Science	ABS-1022
Influence Pore Volume in Compressive Strength Foam Cement Andreawan Santoso, Rini Setiati, Abdul Hamid Petroleum Engineering Departement , FTKE, Universitas Trisakti , Jakarta Abstract Pore volume of foam cement is a main factor affected compressive strength in the addition axial load design. Foam agent material used in this research is Sika-aer as a replace the nitrogen gasses. This research study used mix composition cement 1 : silica sand 0.25 : water 0.5and foam agent 0.03% - 0.15% BWOC. The purpose of this study is provide alternative cementing product beside lightweight cement in oil and gas industry with foam cement to mitigate loss circulations. Compressive strength testing was carried out with different time periods and pore volume testing were carried out on each addition/change in foam agent concentrations every cement slurry mixture. Characteristics of bubbles on cement slurry is one of many factors that influences compressive strength parameters. Compressive strength foam cement depends on size, diameters and relationship between bubbles on the cement slurry. This laboratory study produced compressive strength values between 1078 psia – 3745 psia and pore volume values between 15 cc – 17 cc in 5 samples core foam cement with different foam agent concentrations Sika-aer. Keywords: foam cement, pore volume, compressive strength, bubbles, Sika-aer PermaLink | Plain Format | Corresponding Author (RINI SETIATI)

877	Mathematics	ABS-256
The optimal solution of transportation problem using interval point method with production cost and non production constraint Elis Ratna Wulan, Camelia Anggunsari UIN Sunan Gunung Djati Bandung Abstract In an industry of a company must experience transportation problems. This transportation problem is required to schedule a delivery of goods with the objective to minimize transportation costs. The objective of the transportation model is to plan the delivery of something from the source of the destination in such way as to minimize the total transportation cost. There are several cost constraints that occur in this transportation one of which is a budget constraint in which there are constraints of production costs and non-production.In transportation it is said to be unbalanced if the total number between source and destination is not the same. In this thesis there are methods to solve the problem of transportation is not balanced with the constraints of production costs and non-production is by using the Interval-Point method. In this skripsi there are methods to solve unbalanced transportation with the constraints of production cost and non-production use an interval-point method. This method is used to find the optimal solution. Keywords: unbalanced transportation, production cost, non production, Interval Point Method, optimal solution PermaLink | Plain Format | Corresponding Author (Elis Ratna Wulan)

878	Mathematics	ABS-1028
Investigating Mathematics Pre-service Teachers’ Pedagogical Content Knowledge in Planning a Lesson Meiliasari Meiliasari Universitas Negeri Jakarta Jurusan Matematika UNJ Gd. Dewi Sartika Lt.6 Kampus A UNJ, Jalan Rawamangn Muka Jakarta Timur Abstract This paper is a part of a larger study aiming to develop pre-service teachers’ pedagogical content knowledge (PCK) through lesson study in a teaching practicum. PCK is often explored and discussed within the act of teaching. Since teaching cannot be separated from planning, the successfulness of a lesson is a result of how it is planned. This paper discusses pre-service teachers’ PCK in the planning of a lesson study using the Knowledge Quartet framework. Case study methodology was used. Data for this paper were collected through video and fieldnotes from four lesson study groups in two secondary schools in Jakarta, Indonesia. It involved ten pre-service teachers, five mentor teachers and two lecturers. The analysis of the data shows that foundation, transformation, and connection dimensions of the Knowledge Quartet are evident in the planning. It also shows the interconnectedness of the three dimensions. Keywords: Mathematics, Pedagogical Content Knowledge, Pre-service Teachers, Planning PermaLink | Plain Format | Corresponding Author (Meiliasari Meiliasari)

879	Mathematics	ABS-264
The Comparative Analysis of Hungarian Assesment, Matrix Ones Assignment, and Alternate Mansi Method in Solving Assignment Problem Elis Ratna Wulan, Ayu Rahma Devi, Dian Nuraiman UIN Sunan Gunung Djati Bandung Abstract This paper discusses about the comparison of the three methods in the assignment, that is the Hungarian Method, Matrix Ones Assignment, and Alternate Mansi Method. The Hungarian methods determine penalties in every row and column by decrease the smallest or largest point in row and column. The Matrix Ones Assignment determine penalties, divide minimum or maximum point in every row and column. The Alternate Mansi Method find the minimum or maximum value in each row that has unique value relate with the column. The concept of this problem is applied to car manufacturing company, with balanced data. While University Port Harcourt Project, using unbalanced data. Thus, it can be concluded that the Hungarian method is the most optimal. Keywords: Assignment Problem, Hungarian Method, Matrix Ones Assignment, Alternate Mansi Method PermaLink | Plain Format | Corresponding Author (Elis Ratna Wulan)

880	Mathematics	ABS-777
Improving concept comprehension ability in mathematics by using mathematical model: think-pair-share approach V Z Asria* Departemen Pendidikan Matematika, Universitas Pendidikan Indonesia, Jl. Dr. Setia Budhi No. 229, Bandung 40154, Indonesia *vingky22[at]upi.edu Abstract This study aims to investigate whether or not there the difference between students’ mathematics concept comprehension ability by using Think Pair Share (TPS) approach and by using direct learning reviewed based on their preliminary ability (high, medium, and low level). This research was a quasi experiment by using posttest only control group design that aimed to investigating the cause and effect by treating one of classes, and comparing the result of the class that was treated differently. Methods of data collection in this study through observation, documentation and test, involving 42 students of senior high school in Pekanbaru in the even semester of 2017. T test was used to analyzed the data. The results showed that there are difference between students’ mathematics concept comprehension ability by using TPS approach and by using direct learning reviewed on their preliminary ability to learning outcomes. Classes with TPS approach give better learning outcomes than the ones in direct learning classes. Thus, in general the implementation of TPS approach influenced students’ mathematics concept comprehension ability reviewed based on their preliminary ability at Senior High School in Pekanbaru. Keywords: Think Pair Share, Students’ Mathematics Concept Comprehension Ability, Mathematics Preliminary Ability PermaLink | Plain Format | Corresponding Author (Vingky Zulfa Asria)

881	Mathematics	ABS-524
Optimal Control Solution for Rabies Disease Transmission within Free-ranging Dog Population Eti D. Wiraningsih1, a), Z. Jamaludin2,b), A. P. Ramadhan2,c), M. Misbach2,d) and Asep K. Supriatna2,e) 1Department of Mathematics, Faculty of Mathematics and Natural Sciences, State University of Jakarta, DKI-Jakarta, Indonesia 2Department of Mathematics, Faculty of Mathematics and Natural Sciences, University of Padjadjaran, Bandung-West Java, Indonesia a)Corresponding author: etidwi[at]gmail.com Abstract This paper considers deterministic model for transmission dynamics of rabies virus in the free-ranging dog population. The endemic equilibrium is found and its existence depends on the value of the basic reproduction number. The effect of vaccination in susceptible dog population is considered on the model. We then present the effective reproduction number in the present of the vaccination. Further we developed the formula to obtain the optimal vaccination to eliminate the endemic equilibrium, via the Pontryagin Maximum Principle. Some numerical example are presented to show the properties of the optimal control solution. Keywords: Rabies mathematical model, effective reproduction number, optimal control. PermaLink | Plain Format | Corresponding Author (Eti Wiraningsih)

882	Mathematics	ABS-525
THE INFLUENCE OF PREREQUISITE CONCEPTS UNDERSTANDING AND MATHEMATICAL COMMUNICATION SKILLS TOWARD MATHEMATICAL PROVING ABILITY OF MATHEMATICS EDUCATION PROGRAM STUDENTS IN FACULTY OF MATHEMATICS AND SCIENCE, STATE UNIVERSITY OF JAKARTA Ellis Salsabila, Suyono, Burhanuddin Tolla Universitas Negeri Jakarta Abstract This study aims to obtain information regarding the influence of prerequisite concepts understanding and mathematical communication skills on the mathematical proving ability of Mathematics Education Program Students in Faculty of Mathematics and Science, State University of Jakarta (FMIPA UNJ). The method used in this study was survey and correlational techniques. The study population was all students of the Mathematics Education Program FMIPA UNJ in 2018. The study sample was taken with a simple random sampling technique, there was 50 students in total. In this study, the dependent variable was mathematical proving ability and the independent variables were the prerequisite concepts understanding and mathematical communication skills. Study based on the inferential statistical analysis of research data by using multiple regression analysis to test the effect of independent variables on the dependent variables. The results obtained were: 1) the prerequisite concepts understanding had a positive effect on mathematical proving ability, and there was significant correlation by controlling mathematical communication skills; 2) mathematical communication skills had a positive effect on mathematical proving ability, and there was significant correlation by controlling the prerequisite concepts understanding; 3) there was a correlation of simultaneous prerequisite concepts understanding and mathematical communication skills toward mathematical proving ability. Keywords: mathematical proving ability, prerequisite concepts understanding, mathematical communication skills PermaLink | Plain Format | Corresponding Author (Ellis Salsabila)

883	Mathematics	ABS-534
Application Ethnomatematics in Geometry Learning at SMP 99 Jakarta Selly Anastassia Amellia Kharis (a*), Ellis Salsabila (a), a) Faculty of Mathematics and Science, Universitas Negeri Jakarta, Jalan Rawamangun Muka, Jakarta 13220, Indonesia *sellyanas[at]yahoo.com Abstract Innovative learning in mathematics can be doing through an approach called ethnomathematics. Application of ethnomathematics is focus to relate the material being taught with student condition in real life and encourage student to make connections between their knowledge with their application in the daily life. This paper aim to describe the application of ethnomatematics in the learning of geometry at Junior High School level. This paper uses literature study and experiment. The shapes of ethnomathematics are various results from mathematical activites that people have and develop in their community, including the mathematical concept in cultural heritage in the form of temples and inscriptions, pottery and traditional equipment, batik motifs and borders, traditional games, a local unit, and some activities that already become a culture in society. Ethnomathematics can be applied for teaching mathematics in junior high school level because this enables students to relate learning mathematics in school with their activities in their daily life. Students can easily think about mathematics because they know the application and the benefit of learning mathematics, especially in geometry learning. Keywords: Ethnomathematics; Geometry Learning; Batik PermaLink | Plain Format | Corresponding Author (Selly Anastassia Amellia Kharis)

884	Mathematics	ABS-802
Middle School Students’ Mathematical Disposition Influence Mathematical Communication Ability Minarti, ED (a*)(b) ; Wahyudin(a) a)mathematics education, Universitas Pendidikan Indonesia b) IKIP Siliwangi *eva.arti[at]student.upi.edu Abstract This study aims to examine the effect of the mathematical disposition of junior high school students on mathematical communication skills. This study used a correlation method with a quantitative approach. The subjects in this study were 31 student which is eighth grade at one of the junior high schools at Bandung. The instrument used consists of a test instrument which is a test of mathematical communication skills with the indicator is forming a mathematical model; arguments based on analysis of images and concepts; and the appearance of conceptual models, such as images, diagrams, tables and graphs and non-test instruments in the form of questionnaires about students mathematical dispositions. The results of the study show that the mathematical disposition of junior high school students has a positive influence on mathematical communication skills. Students who have a positive disposition towards mathematical learning tend to be active and can express ideas well. Keywords: Mathematical Disposition, Mathematical Communication Ability, Middle School Students PermaLink | Plain Format | Corresponding Author (Eva Dwi Minarti)

885	Mathematics	ABS-1058
The Effect of Using Weights Observation to Estimate the Monitoring Control Point Coordinate at Sermo Dam A R Affriani (a*), N Widjajanti (b), Yulaikhah (b) a) Departemen Pendidikan Geografi, Fakultas Pendidikan Ilmu Pengetahuan Sosial, Universitas Pendidikan Indonesia * asriria_affriani[at]upi.edu b) Departemen Teknik Geodesi, Fakultas Teknik, Universitas Gadjah Mada Abstract The use of weights observation was effected on the estimation of coordinates and its precision. This research aims to identify 3D coordinates and its precision using weights observation from the result of GAMIT processing and the law of error propagation in sequential adjustment method. This research uses GNSS observation data from 10 deformation monitoring control points around Sermo Dam that was measured on doy 250 in 2014 and doy 129 in 2015. Data processing was performed by GAMIT software to get a baseline length and its precision. Baseline length and its precision were used as input in the sequential adjustment method. The values of weight observation were calculated using the result of GAMIT processing and the law of error propagation. The result of this research are 3D coordinates control point and its precision. The coordinate results using weight observation from GAMIT result does not significantly different from the law of error propagation result, whereas the precision result is different significantly. The differences of precision reached 2 centimeters. Keywords: sequential adjustment; weight observation; error propagation; the addition of precision PermaLink | Plain Format | Corresponding Author (Asri Ria Affriani)

886	Mathematics	ABS-293
Implementation of Tribe Markov Clustering Using Sparse Matrix for Dengue Virus Clusterization Ibnu Hadi (a), Selly Anastassia Amellia Kharis (a*), Sudarwanto (a) a) Faculty of Mathematics and Science, Universitas Negeri Jakarta Jalan Rawamangun Muka, Jakarta 13220, Indonesia *sellyanas[at]yahoo.com Abstract Dengue virus is a member of the genus Flavivirus of the family Flaviviridae. The global incidence of dengue has grown dramatically in recent decades. The dengue virus has 10 viral proteins, 3 structural proteins and 7 nonstructural proteins. To perform the molecular functions required for invasion, replication, and spread of the virus, proteins encoded by dengue virus must interact with and alter the behavior of protein networks in both hosts. In this paper, we present a clustering dengue virus based on Tribe Markov Clustering (T-MCL). T-MCL is a graph clustering method which is the modification of Markov Clustering Algorithm (MCL). T-MCL process is built using R programming language is applied to PPI networks of 26 dengue virus genes data obtained from Virus Pathogen Database and Analysis Resource (ViPR) in 2010-2014. Because data processed in bioinformatics usually have a vast amount of information and have high sparsity, a method to save memory usage and make the computing process faster is needed. This research concludes that T-MCL method produces 7 groups of 26 dengue viral protein sequences with groups having one or more group centers using sparse matrix. Keywords: Tribe Markov Clustering; Sparse Matrix; Dengue Virus PermaLink | Plain Format | Corresponding Author (Selly Anastassia Amellia Kharis)

887	Mathematics	ABS-560
The Analysis of Mathematics with ATLAS.ti Ekasatya Aldila Afriansyah (a*), Nitta Puspitasari (a), Irena Puji Luritawaty (a), Dian Mardiani (a), Rostina Sundayana (a) (a) Department of Mathematics Education, Institut Pendidikan Indonesia Jalan Pahlawan Nomor 32, Sukagalih, Tarogong, Garut, West Java, Indonesia *ekasatyafriansyah[at]institutpendidikan.ac.id Abstract The teacher is one of the important factors in a good teaching and learning process. A teacher is required to have qualified cognitive and pedagogical skills, so that he/she has to be creative in everything, including problem posing. Many studies discussed the problem of students skills but not many discussed the problem of teachers skills itself. This study used ATLAS.ti software as a tool for data analaysis. ATLAS.ti software assisted researchers to manage all various data. Research was conducted on prospective teachers in one private institution. Observation and tests were conducted on 40 respondents, while only 6 respondents were involved at the time of the phases, namely interviews. Through ATLAS.ti software, the result showed that problem posing skill of prospective teachers was still far from enough. What is needed is the right action to overcome the problems. Keywords: Problem posing skill; prospective teacher; ATLAS.ti software PermaLink | Plain Format | Corresponding Author (Ekasatya Aldila Afriansyah)

888	Mathematics	ABS-306
Modelling of The Number of Malaria Sufeffers in Indonesia Using Bayesian Generalized Linear Models Vera Maya Santi(a*), Anang Kurnia(b), Kusman Sadik(b) a) Department of Statistics, Faculty of Mathematics and Natural Science, Universitas Negeri Jakarta b) Department of Statistics, Faculty of Mathematics and Natural Science, Institut Pertanian Bogor Abstract Generalized Linear Models (GLM) has been used for modeling various types of data where the distribution of response variables is an exponential family. Common examples include those for binomial and Poisson response data. The GLM regression model determines the structure of the explanatory variable or covariate information, where the link function specifically determines the relationship between the regression model and the expected value of the observation. Bayesian techniques can now be applied to complex modeling problems where they could not have been applied previously. This method is a simpler model than traditional frequentist techniques. Estimating the regression model parameters is done by using Bayesian GLM. In this paper, we study conducted modeling for the number of malaria sufferers in Indonesia using the Bayesian GLM approach with several prior distributions. There are 6 independent variables that have a significant effect on the regression model, that is population density, Gini ratio, proper sanitation access, healthy zoning, integrated control and total sanitation. Based on Akaike Information Criterion (AIC) and standard error, the Bayesian GLM estimation results for Cauchy and Normal prior distribution will converge to the same value as that obtained by GLM. Keywords: Malaria, Generalized Linear Models, Regression Parameter, AIC, Standard Error, Bayesian GLM. PermaLink | Plain Format | Corresponding Author (Vera Maya Santi)

889	Mathematics	ABS-819
Implementation of the Scoring Model in Mathematical Tests of High School Students in Jakarta Erdawaty Kamaruddin (a*), Dali Santun Naga (b) (a) Vocational Education Program, Informatics Education Studies Program, State University of Jakarta, Jakarta, Indonesia *erda_kamaruddin[at]yahoo.com (b) Graduate Program, Education Research and Evaluation Program, State University of Jakarta, Jakarta, Indonesia Abstract Scoring is a process of converting test answers into numbers which are quantitative values of an answer to an item in an instrument. The numbers of the scoring results will then be converted into values through a certain processing process. The scoring model is a way of scoring a test. The scoring models can result in inappropriate score, where students cannot answer the easy items correctly but successfully answer difficult items. The research data were analyzed using the Donlon and Fisher method through biserial correlation. The study used the experimental method. The study population was high school students in DKI Jakarta, samples of seven hundred students were taken using proportional random sampling techniques. Data collection is done through Mathematics tests in the form of multiple choices using the correct score and punishment score scoring model. The results of data analysis showed the value of thit = 13.0750 and ttab = 1.645. Because of thit > ttab, it was decided to reject the null hypothesis. Thus it can be concluded that in the five option multiple choice objective test, the punishment score scoring model produces a more reasonable score than the correct score scoring model. Keywords: scoring model, correct score, punishment score, math test PermaLink | Plain Format | Corresponding Author (Erdawaty Kamaruddin)

890	Mathematics	ABS-825
Mathematical critical thinking ability and self confidence: (a survey with eight grade students A Yuliani, Y.S Kusumah, and N Fitriani IKIP Siliwangi Abstract Individuals who have critical thinking ability tend to be more careful in drawing conclusions, this is because these individuals have used the process of analyzing, explaining, developing, and choosing ideas. This study aims to analyze students critical thinking ability and self-confidence in circle material. This study analyzed qualitatively with descriptive analysis method. The instruments used in this study were tests of critical thinking skills, interview guidelines and self-confidence scale. The sample of this study was class VIII students in one of the junior high schools in the city of Cimahi as many as 30 students. Based on the results of data analysis, it can be concluded that students critical thinking skills are still quite low, where some students still have difficulty in carrying out the preparation steps by choosing and determining the strategies needed to solve the problem. However, they have pretty good self-confidence. Keywords: Critical Thinking, Self Confidence PermaLink | Plain Format | Corresponding Author (anik yuliani)

891	Mathematics	ABS-827
Classification of Diabetics in Jakarta with Canonical Discriminant Analysis Widyanti Rahayu, Vera Maya Santi, Bety Suryani Putri Universitas Negeri Jakarta Abstract Diabetes is a chronic disease caused by unhealthy habits and lifestyle. Diabetes is characterized by increasing blood sugar levels in the body. Someone who has a blood sugar level slightly above normal can’t be said as a person with diabetes, such conditions are called prediabetes. Classifying diabetes case accurately is an important thing because the occurence of complications and also can be obtained significant variables that affect changes in a persons blood sugar levels. One of the statistics methods which can analyze classification of disbetes case is using linear discriminant analysis. However, when no assumptions can be made about the distribution within each group, or when the distribution is assumed not to be multivariate normal, canonical discriminant analysis can be used to classification of diabetes. In this study we will compare the classification of diabetics using linear discriminant analysis and canonical discriminant analysis. From the results, it was found that the classification accuracy with canonical discriminant analysis was higher than linear discriminant analysis Keywords: discriminant analysis, diabetes, classification accuracy PermaLink | Plain Format | Corresponding Author (Widyanti Rahayu)

892	Mathematics	ABS-576
Junior High School Students Mathematical Reasoning Ability Analysis in Systems of Linear Equations and Aplications. D Fisher1.2, Y S Kusumah1, J A Dahlan1 1Department of Mathematic Education, Postgraduate School, Indonesian Education University, Jl. Setiabudi No. 229 Bandung. 2 Fakultas Keguruan dan Ilmu Pendidikan Unpas, Jl. Tamansari No.6-8 Bandung 40116. Abstract Abstract. This study aims to determine students mathematical reasoning abilities on systems of linear equations and aplications. This research was conducted in the odd semester of the 2018/2019 academic year. The population in this study were all students of class VIII in one of the Junior High School in Bandung with a total sample of 32 students. The research instrument used in the form of test mathematical reasoning abilities. The research method used is qualitative research design. Data were analyzed using data reduction, data presentation, and conclusion. Based on the results of the study it can be concluded that the mathematical reasoning ability of junior high school students in systems of linear equations and aplications is still low. Keywords: mathematical reasoning ability, systems of linear equations and aplications. PermaLink | Plain Format | Corresponding Author (Dahlia Fisher)

893	Mathematics	ABS-1088
Investigating Covariational Reasoning: What Do Students Show when Solving Mathematics Problems? Rooselyna Ekawati, Yusuf Fuad, Ayunin Sofro, Linda Devi Fitriana Universitas Negeri Surabaya Abstract Covariational reasoning plays significant role for solving problems. This study examines the covariational reasoning of postgraduate students when solving mathematics problems such as fraction, velocity and acceleration, proportion, and integral. 26 postgraduate students of mathematics education are involved in this study. Generally, mental action of students more prominent on fraction and proportion than on the other issues. On fraction and proportion problems, all students are able to fulfill all mental actions such as coordinating the value, the direction, and the amount of change of one variable, and also coordinating the average and the instantaneous rate of change of the function. However, on velocity, acceleration, and integral problems students can not show their mental actions well. The shape of their graph are irrespective with initial point, so that they only fulfill 3 of 5 mental actions in covariational reasoning. These findings suggest that learning in mathematics should place increased emphasis on problem involving graph to promote covariational reasoning of the students. Keywords: Covariational reasoning, postgraduate students, fraction, velocity, acceleration, proportion, integral PermaLink | Plain Format | Corresponding Author (Rooselyna Ekawati)

894	Mathematics	ABS-833
DOMI KALI: ELEMENTARY SCHOOL MULTIPLICATION LEARNING MEDIA Nury Yuniasih(a*), Resita Eka Novita Putri(b), Cicilia Ika Rahayu Nita(b) Elementary School Teacher Education Study Program, Universitas Kanjuruhan Malang Jalan S. Supriadi No. 48 Malang Indonesia nuryyuniasih[at]unikama.ac.id resitaeka04[at]gmail.com cirn[at]unikama.ac.id Abstract Abstract The purpose of this study is 1) to develop DOMI KALI media, 2) to describe the feasibility of the DOMI KALI media, 3) to describe the practicality of the DOMI KALI media. The method used is adapted from the ADDIE model with four stages, namely: analysis, design, development and implementation. The subjects of the trial were the third grade students of Sumbersari Elementary School 2. The instruments of data collection used questionnaires, unstructured interviews, and documentation. The results showed that the DOMI KALI media is feasible to use. Assessment by media experts gets a percentage of 91.25%. Assessment by material experts received a percentage of 93.75%. Assessment by prospective users gets a percentage of 82.14%. Assessment of the results of student responses to limited field trials received a percentage of 95.61%. Based on the explanation of the results of the assessment, the DOMI KALI media is "Eligible" or "Very Good" to be used as a learning medium. Keywords: Domi Kali, Multiplication, Elementary School PermaLink | Plain Format | Corresponding Author (Nury Yuniasih)

895	Mathematics	ABS-68
Mathematical Reasoning Ability with Analysis ToolPak Methods in Matrix Algebra Maryati, I.*1, Sumartini, TS.*1, Noordyana, MA. *!, Sofyan, D. *1, Madio, SS. *1 Institut Pendidikan Indonesia *1 Abstract The purpose of this research article is to analyze the effectiveness of using the ToolPak analysis method on matrix geogebra.. The method of this study is an experimental method with quasi-experimental design. The sample in this study is students at the semester 2 of the 2017/2018 academic year at a private college in Garut district, Indonesia. The statistical test used was one sample t test. Hypothesis testing is based on test criteria if the asymp (2-tailed) value greather than alpha then null Hypothesis is accepted. from the results of data processing there is an asymp value (2-tailed) equals to 0.008 smaller than alpha equals to five percent which means null Hypothesis is not accepted. As a conclusion from this study the use of effective ToolPak analysis methods to improve students mathematical reasoning abilities in matrix algebraic material. Keywords: Mathematical Reasoning Ability, ToolPak Analysis Methods PermaLink | Plain Format | Corresponding Author (Iyam maryati)

896	Mathematics	ABS-580
Mathematical Spatial and Disposition Ability through the Wingeom Application R Kariadinata 1*, R Poppy Yaniawati2, J Juariah1, W Susilawati1, A Cahyana1 1 Department Mathematics of Education, UIN Sunan Gunung Djati Bandung 1 Department Mathematics of Education, Universitas Pasundan Bandung *rahayu.kariadinata[at]uinsgd.ac.id Abstract The purpose of this study was to determine the increase and achievement of mathematical spatial abilities based on high, medium, and low categories and to find out the attitudes of students towards learning through Wingeom. This research is a quasi-experimental study conducted on class IX students of one junior high school in Bandung Regency. Based on the data gain and posttest data it was stated that there were differences in the significant increase in mathematical spatial ability in both the PAM category (early mathematical knowledge/ pengetahuan awal matematika) and overall experience differences with the high mean. In general, students respond well to the use of learning media through the Wingeom application with an analysis of 2.76. Thus learning through the Wingeom application can be used as an alternative to improve the spatial abilities and mathematical dispositions of students Keywords: Wingeom Application, Spatial Ability, Mathematical Disposition PermaLink | Plain Format | Corresponding Author (Rahayu Kariadinata)

897	Mathematics	ABS-329
What are The Difficulties in Statistics and Probability? N Puspitasari1*, E A Afriansyah1*, R Nuraeni1*, S S Madio, 1*and A Margana2* 1Program Studi Pendidikan Matematika, Institut Pendidikan Indonesia, Jl. Pahlawan No.32 Tarogong Garut, Jawa Barat, Indonesia. 2Progran Studi Teknologi Pembelajaran Pascasarjana, Institut Pendidikan Indonesia, Jl. Pahlawan No.32 Tarogong Garut, Jawa Barat, Indonesia. Abstract Statistics and probability are parts of mathematics that are often used in everyday life. However, to be able to understand statistics and probabilities a thinking process is needed is not easy. To determine the extent to which respondents understanding of statistics and probability survey conducted by giving the test to 115 respondents. The results showed that respondents difficulties in statistics and probability were difficulties in probabilistic reasoning, combinatoric reasoning, and proof of variability in random variables. Keywords: - PermaLink | Plain Format | Corresponding Author (Nitta Puspitasari)

898	Mathematics	ABS-587
On The Total Vertex Irregularity Strength of Comb Product of Cycle and Other Graph Rismawati Ramdani UIN Sunan Gunung Djati Bandung Abstract Let G be a graph and k be a positive integer. A total k-labeling of G is a map f from vertex set union edge set of G to integers 1,2,3, until k. The vertex weight v under the labeling f is the sum of the label of v and the label of edges incident with v. A total k labeling of G is called vertex irregular if there are no two vertices with the same weight. The total vertex irregularity strength of G is the minimum k such that G has a vertex irregular total k-labeling. Let G and H be two connected graphs. Let o be a vertex of H . The comb product between G and H in the vertex o is a graph obtained by taking one copy of G and cardinality of G copies of H and grafting the i th copy of H at the vertex o to the i th vertex of G. In this paper, we determine the total vertex irregularity strength of come product of cycle and other graph. Keywords: Comb product graph, cycle, the total vertex irregularity strength, total vertex irregular labeling. PermaLink | Plain Format | Corresponding Author (Rismawati Ramdani)

899	Mathematics	ABS-332
Comparison Learning Model between Reciprocal Teaching and Problem Posing for Student Mathematical Understanding (Experiment at SMP 97 Jakarta) Selly Anastassia Amellia Kharis (a*), Ellis Salsabila (a), a) Faculty of Mathematics and Science, Universitas Negeri Jakarta Jalan Rawamangun Muka, Jakarta 13220, Indonesia *sellyanas[at]yahoo.com Abstract The ability to understand mathematical concepts is one of the abilities needed by students in mathematics learning. This study aims to compare learning model between reciprocal teaching and problem posing for student mathematical understanding. This research was conducted at SMP 97 Jakarta in class VII on the subject of One Variable Linear Equations. The research method used quasi experiment. The sampling technique uses two stage sampling; purposive sampling and cluster random sampling. Based on the research data, the average value of understanding the mathematical concept of experimental class I (reciprocal teaching model) is 70.83 while the experimental class II (problem posing model) is 64.35. The normality test using the Liliefors. Homogeneity testing using Fishers test. The research hypothesis test uses t-test statistics and the value of t count = 2.153 and t table = 1.667. Because tcount> t table, then H0 is rejected at the significance level α = 0.05 so it can be concluded that the ability to understand mathematical concepts of students learning using the reciprocal teaching model is higher than students who learn to use the problem posing model. Keywords: Student Mathematical Understanding, Problem Posing, Reciprocal Teaching PermaLink | Plain Format | Corresponding Author (Selly Anastassia Amellia Kharis)

900	Mathematics	ABS-340
Wingeom Program in Geometry Mega Achdisty Noordyana*, Iyam Maryati, Tina Sri Sumartini, Deddy Sofyan, Rostina Sundayana Institut Pendidikan Indonesia Garut, Jl. Terusan Pahlawan 32, Garut 44151, Indonesia. *disty.0101[at]gmail.com *mega[at]institutpendidikan.ac.id Abstract Wingeom program is a mindtool to solve geometry problems. It is used to develop dimensional geometry frameworks. The program can help visualize geometric concepts so clearly that respondents will understand geometry concepts effortlessly. Driven by this expediency, this design base research was carried out in three stages; what to learn, how to learn, when to learn, monitor the ongoing process and evaluate what has been planned, done, and the results of the process. This research is expected to be an alternative and solution in overcoming difficulties in understanding the Geometry concepts. Five respondents were selected to participate in this study. The results of the study showed that the respondents were able to explore, observe, and perform animated images and dimensional geometry material. Keywords: Wingeom Program, Design base Research PermaLink | Plain Format | Corresponding Author (Mega Achdisty Noordyana)

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