Indonesia Conference Directory

Corresponding Author
Ratna Ekawati

Institutions
a) Department of Electrical Engineering Education, Universitas Sultan Ageng Tirtayasa, Jl. Raya Jakarta Km. 4, Serang 42124, Indonesia
a b) Science Education Program, School of Post Graduate Studies, Universitas Pendidikan Indonesia, Jl. Setiabudhi No. 229, Bandung 40154, Indonesia

Abstract
Essential concepts were important aspects in physics education, especially in the study of learning development, student evaluation, and curriculum planning. Several types of concept analysis models were commonly applied in the context of physics, namely semantic network techniques, concept formation (concept analysis), concept maps, and representing substantive structure. The stages of essential concept development were a concept analysis, concept map and essential concept construction. The research method used development research. The stages of development research include (1) the preliminary study phase, (2) the development study phase, (3) the evaluation phase. The main results of this study were essential concept on the topic of Kinematics.

Keywords
Essential concept, Kinematic

Topic
Physics Education

Link: https://ifory.id/abstract/xewFfAcH9V64

Corresponding Author
Luvy Sylviana Zanthy

Institutions
Prodi Pendidikan Matematika
Fakultas Matematika dan Sains
IKIP Siliwangi
Jln. Terusan Jend. Sudirman, Cimahi, Indonesia
*luvysz[at]ikipsiliwangi.ac.id

Abstract
The ability to solve problems and self-determination of junior high school students in West Bandung Regency is still low, so various alternative solutions are needed to overcome them. This study aims to determine the improvement of problem solving ability and self-determination of class VIII students by using ASSURE design (Analyzing student characteristics; State standards and goals; Choosing methods, media and materials; Utilizing media and materials; Requiring student participation; and Evaluating and revising) based on his learning style. This study used an experimental method and one group pretest post-test design. the sample is class VIII students selected by purposive sampling at one of the junior high schools in West Bandung Regency. The instrument of this study used a descriptive test of 5 questions about problem solving ability and 30 scales of student self-determination attitudes. Based on the results of the study, it can be concluded that: Improving problem solving ability and student self-determination using ASSURE learning design is suitable for all types of student learning styles (auditory, visual and kinesthetic).

Keywords
Mathematical Problem Solving; Self Determination; ASSURE

Topic
Mathematics Education

Link: https://ifory.id/abstract/QnqNb2XzEvW8

Corresponding Author
Nida Humaida

Institutions
Department of Biology Education, Faculty of Teacher Training and Education, The State Islamic University of Antasari Banjarmasin
Jalan A. Yani KM. 4,5 Banjarmasin 70235, Indonesia
*nidahumaida[at]uin-antasari.ac.id

Abstract
In the past, people didnt think they would pay for every m3 of clean water, but now they do. To understand water quality management as a part of Live Environment lecture from Department of Biology Education at the State Islamic University of Antasari Banjarmasin, 31 students did a field study at the Water Treatment Plant from Intan Banjar Water Supply Utility in South Kalimantan. A qualitative approach was used through an interview to the head of the production division, staffs at the Water Treatment Plant, and by collecting some feedback from the students. In response to the relation between the clean water scarcity and the potential increase of the clean water price in the future, 45% of students disagreed if the price of clean water provided by the water supply utility increased, although they were aware of the impacts of climate change theoretically, while 55 % of students accepted that if the price of the clean water raised, they must safe water. A lecture strategy based on the current impacts of climate change is needed to raise awareness that people access to clean water is not unlimited any more and to understand the importance of sustainable use to natural resources.

Keywords
clean water; climate change; quality; supply utility

Topic
Biology Education

Link: https://ifory.id/abstract/Uy2JEhw9tLfD

Corresponding Author
Luvy Sylviana Zanthy

Institutions
a) IKIP Siliwangi
Jalan Ters. Jend.Sudirman, Cimahi, Indonesia
*zanthyluvy[at]gmail.com

b) Universitas Pendidikan Indonesia
Jalan dr. Setia Budhi, Bandung, Indonesia

Abstract
The aim of this study is to analyze the mathematical resilience of high school students. The instrument used The Norm Reference Value (NRV), which consisted of 42 items. This Resilience Test consist of 6 indicators, that is: 1) Diligent, confident, working hard and not easily giving up on problems, failures and uncertainties; 2) Desire to socialize, easily provide assistance, discuss with peers, and adapt to their environment; 3) Bring up new ideas/ ways and find creative solutions to challenges; 4) Using experience of failure to build self motivation and self control; 5) Showing curiosity, reflecting, researching, utilizing various sources; 6) Having language skills, controlling themselves and being aware of their feelings. The resilience analysis based on a comparison of the average value of each indicator with a reference value that has been determined in NRV. The results showed that all indicators were in medium category.

Keywords
Mathematical Resilience

Topic
Mathematics Education

Link: https://ifory.id/abstract/cFrTbtfKxPNE

Corresponding Author
Tia Purniati

Institutions
a) Departemen Pendidikan Matematika, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229, Bandung 40154, Indonesia
*tpurniati[at]upi.edu
b) Program Studi Matematika, Universitas Islam Bandung, Jl. Tamansari No. 1, Bandung 40116, Indonesia

Abstract
Ethnomathematics is a program that studies the cultural aspects of mathematics. This program presents mathematical concepts in a way related to the cultural background of students. This study aims to explore ethnomathematics aspects of mosque buildings and ornaments. This study used a qualitative approach to exploration methods. The techniques of collecting data were observation, documentation, and literature reviews. The research location was the Great Mosque of Cimahi which was determined using purposive sampling. The results of the study show that there are ethnomathematics aspects of the mosque building and ornaments. The mathematical concepts of the mosque building and ornaments are related to the concepts of geometry and algebra. Mathematical presentations related to mosque buildings and ornaments are expected to help students to connect mathematics with the surrounding culture so that mathematics becomes more meaningful.

Keywords
ethnomathematics, mosque building, mosque ornament

Topic
Mathematics Education

Link: https://ifory.id/abstract/NTcRndAzGbek

Corresponding Author
Chika Rahayu

Institutions
a) STKIP Muhammadiyah Pagar Alam, Mathematics Education, Indonesia
*chikarahayu80[at]gmail.com
b) Universitas Sriwijaya, Faculty Of Mathematics Education, Palembang Indonesia

Abstract
The purpose of this study to create a product of learning media based ICT in the from of mathematics education games. Mathematics education games is a software to learn mathematic especially made for kindegarden to help learning process in 2013 curicullum. This research methode use design research with three cycles. In this cycle describe about six young childrens tested wiht small group in research for the second step after literature riview. The result of studyis got that by the issue of improvement in the process of presenting the game so it will improve the design and validity and it will be tested. Interestingly, the student didn-t relize that the process is math learning and the curoisity to solve the game is improve. The student never use this kind of ICT before. Next, by improve skill and knowledge that is got during the game as a strating point that will be continue to the other activity that center in the curiousity earlychildhood

Keywords
ICT, Mathematics Education, Game, Counting

Topic
Mathematics Education

Link: https://ifory.id/abstract/YauEzveGQK8R

Corresponding Author
Dewi Adharini

Institutions
1Program Studi Pendidikan Matematika, Sekolah Pasca Sarjana, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229, Bandung 40154, Indonesia
dewimtk98[at]gmail.com
2Departemen Pendidikan Matematika, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229, Bandung 40154, Indonesia

Abstract
Abstract. This study aims to determine the mathematical critical thinking skills and the level of self-confidence of high school students in solving vector problems. Mathematical critical thinking skills and self-confidence are basic capital that students must have so students are confident in solving each vector problem based on critical thinking processes. This type of research is qualitative descriptive. Participants in this study were high school students of class X IPA in one of the public high schools in the city of Cimahi consisting of 30 students who were determined by purposive sampling technique. The instruments in this study were researchers as the main instruments and supporting instruments, namely the test questions of mathematical critical thinking skills of high school students in vector chapter consisting of 5 items, a self-confidence scale consisting of 30 statements, and interview guidelines. The results obtained from this study are students have low critical thinking skills and medium self-confidence. The low level of critical thinking is caused by students being unable to provide reasons, evaluate answers and identify data / concepts / definitions. Suggestions for further research are habituation of students with mathematical critical thinking skills

Keywords
Self Confidence, Mathematical Critical Thinking, Vector

Topic
Mathematics Education

Link: https://ifory.id/abstract/3xDvjd4TMCg7

Corresponding Author
Aflich Yusnita Fitrianna

Institutions
a) Faculty of Mathematics and Science Education, IKIP Siliwangi
Jalan Terusan Jenderal Sudirman, Cimahi Indonesia
*aflich2017[at]gmail.com
b) Faculty of Mathematics and Science Education, IKIP Siliwangi

Abstract
The purpose of this study to develop the didactical design of Calculus subject teaching materials with Problem Based Learning. The research method used in this study was didactical design research. The research steps taken are didactic situation analysis, to see the student learning obstacle that appears in calculus courses. The subjects taken were students who had received Calculus I courses, namely 5 people in class 2015, 5 people in 2016, and 5 people in 2017. The results of the didactic situation analysis were difficulties in understanding students in the initial calculus material, so the special emphasis was placed on - Initial calculus material with problem-based learning.Based on the results of the learning obstacle, a problem-based calculus teaching material was developed and validated. Metapedidaktik analysis, at this stage a limited trial was conducted on students who were taking calculus courses in class 2018. Retrospective analysis revised teaching materials and linked the learning obstacle with student responses and observations during learning. The results of this study are learning tools used in calculus learning with problem-based learning. The didactic design developed received positive responses from students.

Keywords
Didicatical Design, Learning Obstacle, Calculus

Topic
Mathematics Education

Link: https://ifory.id/abstract/9ukEKtpTJ6Zm

Corresponding Author
Putri Astuti

Institutions
a) Departemen Pendidikan Matematika, Sekolah Pascasarjana, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudhi No. 229, Bandung 40154, Indonesia

Abstract
Fractions is one of the essential topics in mathematics learning at school that is often considered difficult to understand by students. Students in Indonesia generally learn fractions in the part-whole comparisons construct. This study aims to describe students misunderstandings in comparing fractions in fraction constructs as part-whole comparisons through representations presented by students. This research is descriptive qualitative research and the data collection was collected by test, interview, and video documentation. The subjects of this study were seven elementary school students at the fifth grade, one of the schools in Bandung. The result of this study show that students who correctly answer the problem of comparing fractions and can represent the fractions that are given in fraction constructs as Part-Whole Comparisons evidently have a misunderstanding of comparing two fractions. The types of mistakes made by students are 1) Students compared the numerator of the two fractions given, 2) Students compared the denominator of the fractions given, and 3) Student did not divide the unit into equal-sized shares. Based on the result, we conclude that students understanding of the definition and representation of fractions as part-whole comparisons is still limited to memorization, not to the good meaning.

Keywords
students- misunderstandings; fractions; part-whole comparisons; representation

Topic
Mathematics Education

Link: https://ifory.id/abstract/PFKWD8xhefag

Corresponding Author
Martin Bernard

Institutions
a) Fakultas Pendidikan Matematika dan Sains, Institut Keguruan dan Ilmu Pendidikan Siliwangi
Jalan Terusan Jenderal Sudirman, Cimahi 40526, Indonesia
*pamartin23rnard[at]gmail.com
b) Fakultas Ilmu Pendidikan, Institut Keguruan dan Ilmu Pendidikan Siliwangi
Jalan Terusan Jenderal Sudirman, Cimahi 40526, Indonesia

Abstract
Mathematics is a subject that must be mastered by everyone at various levels because every activity in everyday life, everyone must have something to do with mathematical problems. Once the importance of mathematics in each individual, the need for the introduction of mathematics is given to children from an early age. However, many are found in the field that students have not been able to master the basic concepts of mathematics are numbers at every level. As a result, the impact on other mathematical materials, so assumes that mathematics is the most difficult subject. With this problem, it can be overcome by using money learning media related to numbers, the goal is to help students easily understand about numbers that can be applied in daily life. Because it is limited to the time and cost of making media, the best step is the use of ICT, namely Powerpoint software using Visual Basic Application that makes money learning media more attractive, fosters students enthusiasm, and encourages students confidence to make appropriate decisions based on student experience in class and in the environment. The study was conducted to develop a VBA Powerpoint-based money media addressing the difficulties of elementary school students, to improve students understanding skills and dare to make the right decisions.

Keywords
Money Media, VBA for Powerpoint, Student Understanding Ability, Decision Making Skills

Topic
Mathematics Education

Link: https://ifory.id/abstract/8Qc4XFqyzxUh

Corresponding Author
Annika Maizeli

Institutions
a. Biology Education, STKIP PGRI SUMATERA BARAT, Jalan Gunung Pangilun No. 4 Padang, Indonesia

Abstract
Developed cognitive assessments were validated mid semester test and final semester test by experts where it was categorized into very valid. One-to-One evaluation was conducted to students completed Biology Learning Process and Learning Outcome course ranging in high, medium and low learning outcome. It was to find out the readability level of mid semester test and final semester test. The research aimed to analyze the Indonesian National Qualification Framework - based cognitive assessment readability. It was a descriptive quantitative using data analysis technique called percentage theory. It shows that Indonesian National Qualification Framework - based cognitive assessment readability from questionnaire is reaching 90.38 % and categorized into very high. The score is derived from readability aspects such as easy-to-use aspect 96,15 %, time consuming aspect 74,99 %, and lay-out aspects 100 %. It is concluded that Indonesian National Qualification Framework - based cognitive assessment readability of Biology Learning Process and Learning Outcome course is very high and usable for students to complete the mid semester test and final semester test.

Keywords
readability, mid tes and final test questions, subject evaluation process and Biology learning outcomes

Topic
Biology Education

Link: https://ifory.id/abstract/WvJHBxrRcbAF

Corresponding Author
Rifky Fauzi

Institutions
Industrial and Financial Mathematics Research Group, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Bandung, 40132, Indonesia

Abstract
In this paper, the shallow water equation is modified so that it includes wind effect using Jeffreys sheltering theory. The modification allows this model to have a wave grow or decay mechanism under the action of wind gust above the surface. The wave generation or damping is investigated by calculating critical wind velocity to excite oscillatory waves on the surface. The result shows that critical wind is proportional to a numerical constant, namely the sheltering coefficient, which related to the capability of wave overcome the wind gust. Thus this model has the convenience that the critical wind speed may comparable to physical data for a suitable choice of this constant.

Keywords
shallow water equation; wave instability; wind effect; Jeffreys sheltering mechanism

Topic
Coastal and Ocean Dynamics

Link: https://ifory.id/abstract/fR7VBgqMhAkz

Corresponding Author
Dian Mustikasari

Institutions
(1) Pendidikan Kimia, Sekolah Pascasarjana Universitas Pendidikan Indonesia
Jl. Dr.Setiabudi No.229, Bandung, 40154, Indonesia
(2)Departemen Pendidikan Kimia, Universitas Pendidikan Indonesia

Abstract
The aims of this study is to examine the views of nature of science and technology (VNOST) of the pre-service chemistry teacher. The participants comprising 23 6th semester students of one of the state universities in Semarang, Indonesia. This study utilized a questionnaire and qualitative approach to gathering data. The NOST questionnaire consisting of eight multiple choice items comprising of four aspects: definitions of science and technology, the epistemology, the internal sociology of science, and the external sociology of science. It was found that 78% of the students had incomplete but legitimate views on the definition of science. They only viewed science as a study of principles, laws, and theories in biology, physics, and chemistry or body of knowledge without considering the scientific process behind it. Meanwhile, the remaining 22% consider science includes an investigative process and the process of resulting knowledge. Generally, the majority of the pre-service chemistry teachers still have lack comprehension on defining science and technology both epistemologically and sociologically. Thus, it can be concluded that pre-service chemistry teachers still need to improve their views of the nature of science and technology.

Keywords
Nature of Science and Technology; Pre-service Teacher; Scientific Literacy; Chemistry

Topic
Chemistry Education

Link: https://ifory.id/abstract/hNC3bzVMG7kX

Corresponding Author
Muhammad Ghiyats Ristiana

Institutions
Department of Mathematics Education, Universitas Pendidikan Indonesia
Jl. Dr. Setiabudhi No. 229, Bandung 40154, Indonesia
*kanghiyats[at]upi.edu

Abstract
Logical thinking is an ability that everyone needs, without exception. Someone who has good logical thinking will be able to finish their problem with the right strategy. As a teacher, this ability is very important, especially if they teach in primary school. The existing phenomenon in mathematics lessons is they always teach just procedural work, however, a teacher shouldn-t be like that. A teacher that couldn-t explain a mathematics concept can be said they don-t have sufficient logical thinking skills. The aim of this research is to prove whether that phenomenon is right or not. In order to do so, we used descriptive qualitative methods by taking some active primary school teachers and provided some simple mathematics questions to see whether they can explain a mathematical concept or they just use a procedural work. The result shows that most of the teachers used procedural work to answer the questions. This means that they don-t have sufficient logical thinking skills. So the phenomenon right exists. Therefore, to reduce this phenomenon in the education world, a teacher should understand well the concept that they will teach, especially in mathematics lessons.

Keywords
Logical Thinking Skills; Primary School Teachers; Mathematics

Topic
Mathematics Education

Link: https://ifory.id/abstract/uXZdpk4hqewK

Corresponding Author
Bambang Eko Susilo

Institutions
a) Departemen Pendidikan Matematika, Sekolah Pascasarjana, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudhi No. 229, Bandung 40154, Indonesia
b) Departemen Pendidikan Matematika, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudhi No. 229, Bandung 40154, Indonesia

Abstract
This study aimed to describe critical thinking skills in integral calculus lecture based on mathematical dispositions. This research used descriptive exploratory methods with instruments: test, scale, observation, and documentation. Data was taken from 105 undergraduate students from the mathematics education study program at a university in Central Java. Critical thinking skills are determined by using four indicators: analyzing problems, concluding and giving explanation, evaluating, and choosing problem-solving strategies. The results showed that: (1) there are no students with high and moderate negative mathematical dispositions; (2) students with low negative mathematical dispositions have poor abilities in evaluating and choosing strategies, and marginally adequate abilities in analyzing and explaining; (3) students with low positive mathematical dispositions have marginally adequate ability in analyzing, adequate abilities in explaining and choosing strategies, and good ability in evaluating; (4) students with moderate positive mathematical dispositions have adequate abilities in explaining and choosing strategies, and good ability in analyzing and evaluating; and (5) students with high positive mathematical dispositions have good abilities in analyzing, explaining, evaluating, and choosing strategies. There was a tendency of increasing achievement on indicators of critical thinking skills based on mathematical dispositions.

Keywords
Critical thinking skills; Integral calculus; Mathematical dispositions

Topic
Mathematics Education

Link: https://ifory.id/abstract/TGEjQxrWA2pH

Corresponding Author
Putri Sasalia S

Institutions
a) Master Program of Mathematics Education, Universitas Syiah Kuala, Banda Aceh, Indonesia
putri.mulianamath[at]gmail.com
b) Mathematics Education Department, Universitas Syiah Kuala, Banda Aceh, Indonesia
mailizar[at]unsyiah.ac.id
c) Department of Informatics, Universitas Syiah Kuala, Banda Aceh, Indonesia
taufik.abidin[at]unsyiah.ac.id

Abstract
Remedial is a program that is designed in accordance with students- need which aims to improve their understanding of a topic before the student move forward to learn the next following topic. In Indonesia the current curriculum requires teachers to conduct a remedial when the students are not able to achive minimum score of students- achievement standard. However, based on a preliminary study, the implementation of remedial in Indonesia, particularly in Aceh, does not yet meet the requirement as most of teacher conduct a remedial by repeating the test or giving additional assignment. This study aims to design and develop e-learning based remedial problem in order to improve remedial for teaching and learning mathematics in senior high school. It is developmental research using System Development Life Cycle (SDLC) model. SDLC has five stages of development that are : planning phase, analysis phase, design phase, implementation phase and support phase. The result of the planning is revealed problems regarding to the implementation of remedial programs in schools. In the analysis phase, the results showed that, in delivering a remedial program, most of teachers gave the same questions as they provided for examination without an extra lesson or tutorial for the students. In addition, there was no teacher who used e-learning for the remedial. Finally, a design e-learning using Moodle 3.8 for remedial is also presented in this paper. For future direction, the last two phases of this research will be implemented.

Keywords
remedial in mathematics, e-learning, remedial using e-learning, system development life cycle, moodle

Topic
Mathematics Education

Link: https://ifory.id/abstract/BtnUXj3Gvmuw

Corresponding Author
Salasatun Nurul Azizah

Institutions
1) Mathematics Education Study Program, Graduate School, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229, Bandung 40154, Indonesia
2) Department of Mathematics Education, Mathematics Education Study Program, Graduate School, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229, Bandung 40154, Indonesia

Abstract
Mathematics is seen by some students as a difficult subject that results in them being anxious when dealing with mathematics learning. What and how mathematics anxiety is an interesting issue to explore through research. This study aims to describe mathematics anxiety profiles of senior high school student based on the types of personality such as extrovert and introvert. It used the qualitative method with triangulation for collecting data in the forms of questionnaire extrovert and introvert personality, questionnaire MAS (Mathematics Anxiety Scale) and interview. The subject in the research were student from the 11th grade at one of the high school in Bandung. The result showed that : (1) Extrovert students assume that mathematics is difficult, feel worried and lack of enthusiasm when in the classroom activity, which the highest anxiety is when the examination and appointed by the teacher related to the material. The extrovert students feel scared, nervous, dizzy, and stomachache; (2) Introvert students assume math as a complicated but interesting subject. Sometimes they feel worried in classroom activities, although they calm and easy in facing examination. Their highest anxiety is when teacher pointed them, where they feel scare and not confidence.

Keywords
mathematics anxiety, extrovert and introvert personality

Topic
Mathematics Education

Link: https://ifory.id/abstract/UAnfad2Pu6LN

Corresponding Author
EUIS GUSANTI SRI RAHAYU

Institutions
a) Mathematics Education, School of Postgraduated Studies, Universitas Pendidikan Indonesia, Bandung, Indonesia.
* euisgusanti[at]upi.edu
b) Universitas Pendidikan Indonesia

Abstract
Abstract. The background of this research is the ability of students to solve the geometry problems in grade XII of vocational high school. Students are less able in solving problem, not using mathematical expression and are not persistent in expressing their argument. This research aims to know students ability in mathematical representation in solving geometry problems. This research used descriptive qualitative method. Data was collected by interview, documentation, and test. This research involved three students including three group : upper level students, middle level students, and lower level student. Data analysis techniques through data reduction, data presentation, and conclusions. Validity of data by using triangulation technique. The result showed that : (i) the average ability to solve geometry problems with visual representation is in medium category because it is able to draw the geometry to clarify the problem and solve the problem of geometry (ii) Mathematical representation expressions, in the upper level students is capable of making mathematical model but have not been able to solve the problem of geometry, while students with middle level and lower level have not been able to create mathematical models, (iii) The ability of word representation or written text of vocational high school students 14 Garut is still low because students have not written steps in solving geometry problems.

Keywords
mathematical representation, geometry, vocational high school

Topic
Mathematics Education

Link: https://ifory.id/abstract/JAhvuqn6EMVd

Corresponding Author
Magfirah Perkasa

Institutions
(a) Sekolah Tinggi Keguruan dan Ilmu Pendidikan (STKIP) Bima, Jl. Tandean Kel. Mande, Kota Bima 84119, Indonesia
*magfirahperkasa[at]gmail.com
(2) Universitas Sembilan Belas November Kolaka, Jl. Pemuda, Tahoa, Kolaka, Kabupaten Kolaka, Sulawesi Tenggara 93561, Indonesia

Abstract
The study aims to measure the enhancing of character of Indonesian golden generation on the implementation of education for sustainable development. The data were collected by using the character self-assessment that given to senior high school students in nine provinces spread in the western, central and eastern regions of Indonesia. The instrument was adapted from character education indicators by Ministry of Research, Technology and Higher Education and the combination of sustainable development learning indicators. The result shows that mostly the character aspects of Indonesian golden generation can be concluded is enhance. ESD character model can enhance several character of students but still need more time to enhance student-s critical attitude and creativity. Besides, according to the result, it can inferred that implementation of education for sustainable development in science education, biology, physics, and chemistry subject can be recommended by using several learning models and one of them is ESD Character Model.

Keywords
education for sustainable development; science education; character; golden generation

Topic
Science Education

Link: https://ifory.id/abstract/9xCXdcztMKGR

Corresponding Author
Lusia Narsia Amsad

Institutions
1) Sekolah Pascasarjana, Universitas Pendidikan Indonesia, Bandung - Indonesia
2) Departemen pendidikan Kimia, Universitas Pendidikan Indonesia, Bandung – Indonesia

Abstract
Students always show problems when learning about synthesis organic. Therefore, purposed of this research is want to reveal all students- problems in synthesis organic chemistry. The participants of this research are 16 students of chemistry education in one state university in Papua, Indonesia. The type of this research is descriptive research where the students are given learning concerning to the concepts of the synthesis of organic compounds. The result shows students having a highest problems in concepts product stereochemistry of organic compound and the lowest in concepts about the functionality groups. Therefore, based on this study the lecturer have to give a clearly explanations about the concepts of reagent, required condition and related to the stereochemistry product in learning synthesis organic.

Keywords
Revealing, Students- problems, Organic synthesis

Topic
Chemistry Education

Link: https://ifory.id/abstract/yLHUPK3wpMZB

Corresponding Author
Sifa Nurrohmah

Institutions
1Departemen Pendidikan Kimia, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudhi No. 229, Bandung 40154, Indonesia
2SMA BPI 1, Yayasan Badan Perguruan Indonesia, Jl. Burangrang No. 8, Bandung 40262, Indonesia
*sifanurrohmah[at]upi.edu

Abstract
This research is based on the difficulty of students in understanding the concept of abstract electrolyte and non-electrolyte solutions. To aid students understand abstract concepts in electrolyte and non-electrolyte solutions, submicroscopic understanding of the concept is required with the scaffolding of augmented reality (AR) media. The aim of this study is to boost students understanding concepts with the scaffolding of augmented reality (AR) media in the sharing task learning of electrolyte and non-electrolyte solutions. This research was conducted at one of the high schools in Bandung of grade X MIA. Data is obtained through questions understanding the concept of electrolyte and non-electrolyte solutions and student worksheets. Data analysis of research result is done quantitatively and descriptive qualitative. The results define students conceptual understanding from each question indicator obtaining positive results. Concluded the application of scaffolding augmented reality (AR) media in the sharing task learning of electrolyte and non-electrolyte solutions enhances understanding of students concepts.

Keywords
augmented reality media, sharing task, electrolyte and non-electrolyte solutions

Topic
Chemistry Education

Link: https://ifory.id/abstract/Zh98LFvUmpwM

Corresponding Author
Reynaldi Aditya Prakasa

Institutions
Program Studi Pendidikan Teknik Mesin, Fakultas Keguruan dan Ilmu Pendidikan,
Universitas Sebelas Maret, Surakarta

Abstract
The objectives of this research are to investigate: (1) the correlation between the learning achievement in Microteaching and the preparedness to become teachers of the students of the Mechanical Engineering Education of the Class of 2015; (2) the correlation between Softskill and the preparedness to become teachers of the students of the Mechanical Engineering Education of the Class of 2015; (3) the correlation of the learning achievements in Microteaching and Softskill to the preparedness to be teachers of the students of the Mechanical Engineering Education of the Class of 2015. The data of research were collected through documentation for the variables of learning achievements in Microteaching and questionnaire for variable of Softskill and the variable of reparedness to become teachers. The questionnaire items were validated by using Pearson-s Product Moment and the reliability of the instruments was tested by using the Alpha Cronbach formula.. The pre-requisite analysis consisted of normality test, linearity test, and multicolinearity test. The data of research were analyzed by using the partial correlation analysis and multiple regression analysis at the significance level of 5%. The results of research show that (1) there is a positive and significant correlation between the learning achievement in Microteaching and the preparedness to become teachers of the students of the Mechanical Engineering Education of the Class of 2015; (2) there is a positive and significant correlation between the learning achievement in Softskill and the preparedness to become teachers of the students of the Mechanical Engineering Education of the Class of 2015; and (3) there is a positive and significant correlation of the learning achievements in Microteaching and Softskill to the preparedness to become teachers of the students of the Study Program of Mechanical Engineering Education of the Class of 2015

Keywords
Learning achievement in Microteaching, Softskill, Preparedness to become teacher

Topic
Science Education

Link: https://ifory.id/abstract/jZGfp4FaUYQ3

Corresponding Author
Devita Marlina Venessa

Institutions
a)Masters in Chemistry Education, Postgraduate School, Indonesian University of Education, Jl. Dr. Setiabudi No. 229, Bandung 40154, Indonesia
* dy2psihite[at]gmail.com
b)Department of Chemistry Education, Indonesian University of Education, Jl. Dr. Setiabudi No. 229, Bandung 40154, Indonesia

Abstract
The purpose of this study was to determine the difficulties faced by pre-service chemistry teachers in correlating the structures with physicochemical properties of ionic liquids. The descriptive research method used in this study is presented quantitatively and qualitatively. The participants in this study were 23 pre-service chemistry teachers from one of the universities in Indonesia. Data collected using an instrument in the form of a description that contains discourse on ionic liquid technology. In general, the results of the study indicate that more than half of the students have difficulties in applying chemical concepts related to the context of the relationship of structures with physicochemical properties of ionic liquids. The result also reveals that the most dominant difficulty experienced by pre-service chemistry teachers difficult to specify chemical concepts related to the tendency of differences in melting point of molten salt and ionic liquids. The results findings will be used as the basis for developing didactic designs that are oriented to resolve learning obstacles by pre-service chemistry teachers in understanding the relationship of structures with physicochemical properties of ionic liquids.

Keywords
difficulties; ionic liquid; pre-service chemistry teachers;

Topic
Chemistry Education

Link: https://ifory.id/abstract/b7tf9WrFVnAx

Corresponding Author
Nur Rokhmani Tri Siswi

Institutions
(a)Biology Education, Postgraduate School, Universitas Pendidikan Indonesia
*nur.rokhmani[at]upi.edu
(b)Department of Biology Education, Universitas Pendidikan Indonesia

Abstract
Abstract Metacognitive ability is assessed to have an effect on how the students can learn independently to obtain academic achievement. Learning that can support the development of metacognitive abilities are needed, so students can be directly involved in developing their learning strategies. For this reason, the study applies project-based learning to biology subjects to develop student metacognitive learning. In this study, the effect of project-based learning on students ability to solve metacognitive test questions on biology subjects was shown. This study aims to measure how project-based learning can improve students metacognitive abilities and identify students metacognitive awareness in learning. The data in this study were collected through pretest, posttest and metacognitive awareness questionnaires. These data were analyzed quantitatively to produce a better understanding of the problem and the results of the study. As a result, students ability to solve metacognitive problems has increased by 19,4 points. The Gain Index obtained from the average student yield is 0.7. It was also explained that students metacognitive awareness after project-based learning began to appear in several aspects including aspects of search strategy and planning with an average response of 36 and 34 points, respectively.

Keywords
Metacognitive ability; Project Based Learning; Biology Project;

Topic
Biology Education

Link: https://ifory.id/abstract/KvBfRZFDdyt4

Corresponding Author
Mr. Andrianto

Institutions
a) Department of Engineering, Universitas Negeri Malang
Jalan Semarang 5, Malang 65145, Indonesia
b) Centre of Advanced Materials for Renewable Energy
*aripriharta.ft[at]um.ac.id

Abstract
This paper presents the maintenance scheduling of transformer oil in Banaran Substation, Indonesia. Based on the function of the transformer is important to distribute electricity. If there was a fault, it can decrease the reliability of the transformer. Therefore, it is necessary to schedule the periodic maintenance of transformer oil to improve the power transformer reliability. So in this research using Markov method to analyze the reliability and availability of transformer oil. It happened because of Markov method can increase estimates effectively. This research adds the used parameters, namely the results of the DGA test with TDCG and the results breakdown voltage test. These parameters will be processed by using Markov method to find the value of reliability and availability with calculated using the failure rate and the repair rate. Where the value is obtained from the calculation of MTTF and MTTR. The calculation results are simulated using Matlab R2014a, and the results show us that the reliability and availability of transformer oil decrease every month. The biggest decrease occurred on day 180 in a period of 365 days, with the value of TDCG is 9.844% and 3.395% while the value of breakdown voltage is 32.19% and 24.83%. Therefore, maintenance is carried out at least twice a year to improve the quality of transformer oil which functions as an isolation transformer and prevents transformer failure.

Keywords
Maintenance Scheduling, Markov Method, DGA, Breakdown Voltage, Reliability, Availability

Topic
Renewable Energy

Link: https://ifory.id/abstract/jJEPmxnfe7TR

Corresponding Author
Aulia Fitri Rachman

Institutions
a) Magister Pendidikan Matematika, Universitas Lampung, Jl. Prof. Dr. Sumantri Brojonegoro No. 1, Bandar Lampung 35141, Indonesia
*auliaf97[at]gmail.com
b) Departemen Pendidikan Matematika, FKIP, Universitas Lampung, Jl. Prof. Dr. Sumantri Brojonegoro No. 1, Bandar Lampung 35141, Indonesia
c) Departemen Matematika, FMIPA, Universitas Lampung, Jl. Prof. Dr. Sumantri Brojonegoro No. 1, Bandar Lampung 35141, Indonesia

Abstract
Mathematical communication skills have an important role in mathematics because it can help students to express their understanding. This study aims to analyze the students mathematical communication skills using Bruners theory in the system of three-variable linear equations material. The type of research is a qualitative descriptive research. The research was conducted at SMAN 4 Kotabumi with the subjects in this study are 129 students of X grade. The data collection technique used was a written test of mathematical communication skills. The results of this study indicate that students mathematical communication skills are still relatively low. Constraints found by researchers that led to students low mathematical communication skills are: (1) students have not been able to understand the problem and explanation correctly, (2) students have not been able to do the calculations correctly when associating with system variables equations; (3) students cannot conclude the results correctly.

Keywords
Students mathematical communication skills; Bruners theory

Topic
Mathematics Education

Link: https://ifory.id/abstract/TRpHJFC2LkdB

Corresponding Author
Yesy Diah Rosita

Institutions
a) Program Studi Teknik Informatika, Fakultas Teknik, Universitas Islam Majapahit.
Jln. Raya Jabon KM 0.7, Mojokerto, 61364
*yesidiahrosita[at]gmail.com
b) Program Studi Teknik Informatika, Fakultas Teknik, Universitas Islam Majapahit.
Jln. Raya Jabon KM 0.7, Mojokerto, 61364

Abstract
Librarians classify the book using Decimal Dewey Classification (DDC) System. It is the system for cataloging and indexing of books that have 3 divisions, a ten, a hundred, and a thousand. Each division reflects the book subject. Mostly, librarians only read the book title by reason of it represents the book contents. Then, they search the index of it in the DDC system. However, the process will need extra time. Efficiently, Optical Character Recognition can assist the librarians to convert the image of the book cover into text-editable for getting the book title. For pre-processing, the text will be changed to lowercase, removed the useless words, and tokenized. Long Short Term Memory (LSTM) Neural Network is almost used for text classification research. Its performance has been accurate until more than 85% in this research. Librarians only scan the book cover using a web camera and obtain the information of the book index.

Keywords
classification; library; lstm; ocr; text

Topic
Information Systems Technology

Link: https://ifory.id/abstract/qZ7xJXLVkF3a

Corresponding Author
Ramadhani Kurniawan Subroto

Institutions
a) Department of Electrical Engineering, Brawijaya University, MT Haryono 167 Rd, Malang 65145, Indonesia
* ramasubroto[at]ub.ac.id

Abstract
The Zeta converter is a DC-DC converter that has a small ripple current and voltage ripple that is widely applied to PFC (power factor correction), photovoltaic generation and so on. However, the characteristics of the open loop response output voltage from the Zeta converter has a considerable overshoot and long settling time. On the other hand, with significant changes at input voltage and load, the output voltage produced by Zeta converter may fluctuate. Therefore, a PID controller based on Fuzzy logic tuning is implemented to regulate the output voltage of Zeta converter. According to simulation results the output voltage with Fuzzy-PID controlled is able to track the desired reference voltage. Compared to PID controller, the output voltage controlled with Fuzzy-PID controller has a smaller voltage deviation and recovery time. At a significant input voltage change the PID controller output response becomes unstable, while the fuzzy-PID controller still produces a good output response.

Keywords
Zeta converter; fuzzy-PID; PID controller; voltage regulation

Topic
Renewable Energy

Link: https://ifory.id/abstract/bLqfUyVkzDjY

Corresponding Author
Hani Nurhasanah

Institutions
Universitas Pendidikan Indonesia

Abstract
The purpose of this study is to describe the results of the analysis of Ways of Thinking (WoT) and Ways of Understanding (WoU) of students in solving vector problems based on Harel-s Theory. The analysis carried out was related to Harels Theory and clinical interview based on Interview Communication Map (ICM). The subjects in this study were 50 high school students in Bandung, West Java, Indonesia. This study used qualitative research. The process of collecting data was through literature studies, observations, tests, and interviews. The results found that WoT and WoU of students influence each other. The way of thinking affects students- understanding about a concept which later will influence the way students think in solving mathematical problems. Each category of WoT and WoU was influenced by external factors and internal factors. External factors were the instructional principles mentioned by Harel, while internal factors were local necessity which include self-motivation. So that, WoT and WoU of students in solving vector problems is related and affect each other and also they have unique characteristics.

Keywords
instructional principles, interview communication map, self-motivation, Harel-s Theory, ways of thinking, ways of understanding, vector

Topic
Mathematics Education

Link: https://ifory.id/abstract/jNH8xF2apk9D

Corresponding Author
Anis Ardyany Puspaningtyas

Institutions
1Sekolah Pascasarjana, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229, Bandung 40154, Indonesia

2Departemen Kimia, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229, Bandung 40154, Indonesia

3Departemen Fisika, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229, Bandung 40154, Indonesia

Abstract
As the learning material source that used independently, science books such as science textbooks or science enrichment books need to have good quality text that suit to student-s reading level. The purpose of this study is to analyse the readability of science book especially scientific literacy enrichment book on earth science context that developed based on scientific literacy competence on PISA 2015. Method on this research is descriptive quantitative with determining main concept on passage as instrument to collect data and Raygor Graph to analyse book-s reading grade level. Passage on instrument are passages without graph, picture, formula or blank page. Data that collected are main concept explanation for determining passage readability percentage and difficult words for determining reading level of the passage. Participants that contribute on this research are 7th grade students at one of junior high school in Cilacap distric in Central Java, Indonesia. Data showed that readability percentage of the passage is 56% that categorized as readable. It means that half of the participants can determine the main concept of the passage and half of the passage can be read easily. The Raygor Graph showed that the passage is suitable for 8th grade student-s reading level. It explains why the percentage of the passages is low. Both of the data showed that the texts of the book is readable for junior high school students. Based on the data, the texts are readable even the participants are lower the student-s reading grade level. It showed that the text has enrichment book characteristic that readable for various student-s reading level.

Keywords
Readability, Science Literacy Enrichment Book, Earth Science Context, Scientific Literacy Skills

Topic
Science Education

Link: https://ifory.id/abstract/PfJeHb8zKLTm