Indonesia Conference Directory

Corresponding Author
suci utami Putri

Institutions
UPI

Abstract
Early childhood education in schools must be able to stimulate the development of communication skills as one of the most important aspects of development. Based on the results of preliminary observations, it was identified that learning proces in early childhood education is still dominated by the individual and paper based strategy so that the development of childrens communication is low. To optimize childrens communication skills, STEAM-PBL is applied which in its stages provides more opportunities for children to express ideas verbally. STEAM-PBL was carried out in three series with a total of 12 meetings involving 14 children aged 4-5 years and observed using an observation sheet containing a number of indicators related to communication skills. Data were analyzed using descriptive statistics supported by narrative explanations. The results showed that childrens communication skills developed very well until the end of learning.

Keywords
STEAM, PjBL, Early Childhood Education, Communication skills

Topic
Integrated Science Education

Link: https://ifory.id/abstract/g8NMeHERKW2h

Corresponding Author
Eka Cahya Prima

Institutions
Universitas Pendidikan Indonesia

Abstract
This research aims to determine the effectiveness of Stellarium as an Interactive Multimedia to students understanding and motivation in learning solar system. This study used quasi experimental design. The sampling used was convenience sampling. The research was conduct in one of private school in Bandung which number of students is 41. The Stellarium used is windows based 0.15.1 version. The Objective Test Item and Questionnaire were used as research instrument. These instruments were given to experimental and control class as pretest and posttest. According to the analyses result, the value of Normalized gain in experimental class and control class is 0.33 and 0.2. According Independent sample test result the hypothesis in this research was accepted. The value of sig (2-tailed) is 0.019 with significance value is 0.05. Thus, the result of this research are: There is different of students- understanding using stellarium in learning solar system; The students- motivation in learning solar system using stellarium is categorized as adequately motivated.

Keywords
Interactive Multimedia, Solar System, Stellarium, Students- Motivation, Students- understanding

Topic
Integrated Science Education

Link: https://ifory.id/abstract/X9vdzMrfF8NA

Corresponding Author
Oktian Fajar Nugroho

Institutions
a) Doctoral Degree, Science Education, School of Postgraduates Studies, Universitas Pendidikan Indonesia, Bandung
b) Science Education, School of Postgraduates Studies, Universitas Pendidikan Indonesia, Bandung

Abstract
The scenario of Industry 4.0 and 21st century skills show rapidly increase and informed. In this century, the main goal of our educational system should be able to answer students needed for living in the world. In recent years, STEM Education has received growing attention to be considered to understand STEM Education. In the South East Asia, Indonesia is one of the biggest country has a large number of human resources that should be developed. This study was aimed to examine the urgency of STEM education in Indonesia within the scope of 21st century skills categories by using the content analysis method, examine best practice of STEM education for teachers by investigating engineering design skills training and reviewed the literature from 1990 to 2016 that has emphasize on development of STEM education around the world. The findings showed that STEM Education has developed around the world and has a big impact to enhance students- concept comprehension, literacy, and creativity. Many researches provide evidence the best practice for science teacher to implement STEM Education. STEM has a close to daily life and increase student awareness with the environment.

Keywords
STEM Education; 21st century skills; Science Education

Topic
Integrated Science Education

Link: https://ifory.id/abstract/deYRETXt7FN8

Corresponding Author
Eka Cahya Prima

Institutions
Universitas Pendidikan Indonesia

Abstract
Modern learning using technology demands students to be have awareness in the use of technology on their daily life. As the answer to the problem, the concept of a traditional learning approach should be changed into a learning approach that integrates students- knowledge, performance, and skills. STEM learning is one of innovational approach that integrates students knowledge, skills, and performance towards technology and engineering design. This research aims to investigate the effect of STEM learning on students- science, technology, engineering, and mathematics (STEM) literacy in learning electricity concept. The method which used in this research was Weak Experimental method. The sample was taken randomly (n=16 students) of Private school in Bogor. The quantitative data of this research is gained through objective test, while the qualitative data was gained by observation sheet. According to the analysis of the research, it is obtained an improvement on students- STEM literacy, especially in technology, engineering, and mathematics literacy while students- scientific literacy shows negative improvement. The improvement of students- science, technology, engineering, and mathematics literacy obtained through normalized gain systematically by 0.22, 0.12, 0.03,and -0.02 categorized as low improvement. Even though students cannot relate the scientific concept occurs during the experiment, students are excited to conduct the project using Arduino-Protoboard experiment since they had an experience to use the lastest kind of technology.

Keywords
STEM Learning, STEM Literacy, Arduino, Protoboard experiment, Electricity

Topic
Integrated Science Education

Link: https://ifory.id/abstract/HVGc32tTZqwm

Corresponding Author
Deni Cendrianto

Institutions
a) Student of Biology Study Program, Graduate School, Indonesia Education University, St. Dr. Setiabudi No. 229, Bandung 40154, Indonesia
denicendrianto[at]upi.edu
b)Department of Biology Education, Indonesia Education University, St. Dr. Setiabudi No. 229, Bandung 40154, Indonesia

Abstract
This preliminary research aim to give description about students perception towards biology learning activities based on information and communication technology. This research used quantitative survey research method with deep explanation. The data collection used questionnaire and interview. The statements in the questionnaire were open and close statements, which showed positive and negative perception with 4 point Likert scales. Numeric indices of appreciation of biology learning activities based on information and communication technology were determined using questionnaire information from 58 students in tenth grade. The result show that out of 58 respondents, most of the express positive perception towards biology learning activities based on information and communication technology. The students positive perception towards biology learning activities based on information and communication technology activity implies can made them become more active in learning, most students said they didnt like learning that only listened to lectures from teachers, they preferred learning activities that involved them actively in learning and that the use of gadgets in learning made them more active in learning. Based on the survey results (56.9%) students do not feel difficulties in using ICT when learning biology, this is because they are digital natives who are used to using digital equipment.

Keywords
students; information and communication technology; biology education

Topic
Biology Education

Link: https://ifory.id/abstract/g7qrHb8F4dta

Corresponding Author
Sry Rita Puspitasari

Institutions
a) Sekolah Pascasarjana Universitas Pendidikan Indonesia
Jl. Dr. Setiabudi No.229, Bandung 40154, Indonesia
*sryrita27[at]upi.edu
b) Departemen Pendidikan Matematika Universitas Pendidikan Indonesia2
Jl. Dr. Setiabudi No.229, Bandung 40154, Indonesia

Abstract
This study aims to obtained a picture of students mathematical creative thinking abilities on triangles and quadrilateral material, which involves 4 indicators namely fluency, flexibility, originality and elaboration. The method in this study was a qualitative descriptive study, which was conducted on 31 students at one junior high school in Cipatat sub-District. Data in this study were obtained through tests and interviews. The results of this study indicate that there is a tendency that flexibility indicators can be mastered well by students and based on an average score of 2.37 that is in TKBK 2. The conclusion of this study is the mathematical creative thinking ability of students in one junior high school in Cipatat sub-District is quite creative.

Keywords
Creative Thinking; Triangles and Quadrilateral

Topic
Mathematics Education

Link: https://ifory.id/abstract/vwe8xZg9nmcb

Corresponding Author
Handina Djaelani

Institutions
International Program on Science Education, Indonesia University of Education
Jalan Dr. Setiabudi No.229, Isola, Sukasari, Bandung, Jawa Barat 40154
*ikmandanugraha[at]upi.edu

Abstract
Environmental awareness is critical to understanding the present condition of the environment and the significance of protecting it. Science education has an important role in assisting environmental awareness for students. However, limited class time and massive class size problems have restricted student participation and attempted thinking. Consequently, the class debate findings tend to end up being superficial, having little effect on the environmental awareness of the students. This study seeks to explore the environmental awareness of students through the Instagram-mediated SAMR model in studying environmental pollution. Three 8th grade classes of a private junior high school in Bandung consisting of 76 students participated in this study. The students were advised to follow an Instagram account by learning the subject, interacting with each other and the teacher, and submitting their vlog projects. An online questionnaire adapted from Hiramatsu consisting of 5 factors of environmental awareness was used to collect information on the environmental awareness of the students. The data were descriptively evaluated to explore students- responses to those factors. The finding of student environmental awareness demonstrates that students care about environmental problems. It is suggested that learning environmental pollution topic using Instagram-mediated SAMR model can facilitate student environmental awareness.

Keywords
Students Environmental Awareness, Environmental Pollution, SAMR Model, Instagram

Topic
Integrated Science Education

Link: https://ifory.id/abstract/NvQc79EXwxJz

Corresponding Author
Ultach Enri

Institutions
Faculty of Computer Science, Universitas Singaperbangsa Karawang, Karawang 41361, Indonesia

Abstract
Skills Competency (UKK) is part of government intervention in ensuring the quality of education in the Secondary Vocational School aims to measure the achievement of a certain level of competency in students- appropriate competency skills. The C4.5 algorithm is the algorithm for classification learning machine learning and data mining that generate either a decision tree, each attribute selection is used in determining the best criteria for classifying the tuple. Feature selection is done to reduce irrelevant features and reduce the dimensions of the features in the data. The purpose of the research is to find out how competent the students- in their vocation as well as new strategies for educators in providing a more effective learning. Students- competency expertise data from department of computer engineering and networks in SMK TI Muhammadiyah Cikampek will be used. Overall the results of the validation of the model experiments that have the best influence is supplied with a set of test accuracy values of 96.875%, and 13 optimal attributes are selected. The utilization of the feature selection is to reduce the size of the input data that will be managed on processing and analysis. Therefore, in this study the C4.5 algorithm with feature selection can provide good and effective results.

Keywords
C4.5 Algorithm, Data Mining, Feature Selection

Topic
Computer Science

Link: https://ifory.id/abstract/wtfLuRZ37NFX

Corresponding Author
Nunu Nurhayati

Institutions
1*)Departemen Pendidikan Matematika, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229, Bandung 40154, Indonesia
2)Departemen Pendidikan Matematika, Universitas Kuningan, Jl. Cut Nyak Dhien No. 36 A, Cijoho, Kec. Kuningan, Kabupaten Kuningan, Jawa Barat 45513, Indonesia

Abstract
The aim of this study is to analyze the influence of collaborative problem solving on the enhancement of mathematical proportional reasoning ability. The problems underlying this study include the proportional reasoning ability of students is still low so innovation in learning that can develop students proportional reasoning abilities. The method used is quasi-experiment with non-equivalent control group design. The sampling technique is purposive sampling. This study was conducted at Junior High School and the subjects of this study were 58 students of SMPN 3 Kuningan, 28 students in the experimental class and 30 students in the control class. Instruments which is used are pretest, posttest and observation sheet. Data analysis was conducted by using SPSS 16 software. Data analysis was carried out quantitatively. Quantitative analysis was performed by calculating the N-gain using the normality test, and t-test. Research results of this study are (1) The enhancement of mathematical proportional reasoning ability of students who received collaborative problem solving is better than students who received conventional learning, (2) There is difference of mathematical proportional reasoning ability of students who received collaborative problem solving and students who received conventional learning, (3) The average of n-gain proportional reasoning ability are 0.33 in the experimental class and 0.22 in the control class.

Keywords
Collaborative Problem Solving, Proportional Reasoning Ability

Topic
Mathematics Education

Link: https://ifory.id/abstract/Z8zAJbCFajUX

Corresponding Author
Rosiqoh R

Institutions
Universitas Pendidikan Indonesia

Abstract
This study aims to determined the ability of mastery of concepts with a scientific approach to class X students on the material momentum and impulses. This research is a single case study case study where the purpose of the study is to examined the conditions and situations that are happening, thus providing a picture based on the facts found in the field. The design of this study was post-only group design with a sample of high school grade X students in one school in Bandung. Data analysis techniques using Rasch models and instruments used in this study were multiple choice tests and student worksheets (LKPD). The results showed that the low ability to master the concepts of students in each aspect with the percentage in the aspects of understanding (65.3%) and (57.6%), the fourth and sixth are aspects of applying (61.5%) and (53.8%) ), and fifth is the aspect of analyzing (42.3%).

Keywords
mastery of concepts, scientific approach

Topic
Physics Education

Link: https://ifory.id/abstract/PJDH34Kcuf72

Corresponding Author
Hasri Hasri

Institutions
1) Chemistry, Faculty of mathematic and natural sciense , Universitas Negeri Makassar
2) Biology, Faculty of mathematic and natural sciense , Universitas Negeri Makassar
3).Alumny chemistry, Faculty of mathematic and natural sciense , Universitas Negeri Makassar

Abstract
Abstract Synthesize ZnO-Activated Carbon (ZnO-AC) use the time, concentration, pH degradation Acid Orange 7 dyes. The stages preparation of synthesize included sample preparation, making shell activated carbon candlenut, ZnO-KA characterization and degradation study.. SEM-EDX analysis results showed an uneven morphology with a percentage of ZnO mass of 58.46%. ZnO-KA degrade Acid Orange 7 for 8 hours with a concentration of 50 ppm and at pH alkali obtained percentage degrade of 96.23%. Key words: Degradation, Acid Orange 7, ZnO-KA

Keywords
fotodegradasi, Acid Orange 7, ZnO-Karbon Aktif (ZnO-KA)

Topic
Chemistry

Link: https://ifory.id/abstract/EmVfubnv4XZ6

Corresponding Author
Henry Setiyanto

Institutions
1Analytical Chemistry Research Group, Institut Teknologi Bandung, Bandung, Indonesia
2Research Unit for Clean Technology, Indonesian Institute of Sciences, Bandung, Indonesia
3Department of Physics, Universitas Negeri Malang, Malang, Indonesia

Abstract
Methylene Blue (MB) is a dye commonly used in the textile industry. Dyes waste from the textile industry harms the ecosystem of the environment. One method of textile dye waste degradation is mediated electrochemical oxidation. This method uses an oxidation-reduction process using metal ion as a mediator. The mediator metal ion acts as an oxidizer which oxidizes textile dyes waste into simpler compounds, namely CO2 and H2O. The mediator ion used in this study was Ce (IV) in an acidic. The results of the degradation were analyzed using the voltammetry method. In voltammetry there are three electrodes are used, namely working electrode, reference electrode, and auxiliary electrode. This study used a carbon paste electrode as a working electrode, a platinum wire as an auxiliary electrode and a homemade Ag/AgCl as a reference electrode. The results of the characterization of the Ag/AgCl reference electrode showed that the Ag/AgCl had the same characteristics as the BAS commercial reference electrodes (bioanalytical systems). The results of cyclic voltammogram showed that the oxidation potential value of MB is 0.2880 V. The oxidation and reduction potential of Ce (III)/Ce (IV) in 0.2 M H2SO4 were 1.2400 V and 0.4520 V. This potential value indicates that the MB oxidation potential was not disturbed by the mediator ion potential. The optimum condition of electrodegradation was obtained at 250 ppm MB in 0.2 M H2SO4 with the addition of 0.015 M Ce (III) for 30 minutes using the potential of 6 V.

Keywords
Methylene Blue, MEO, degradation, cerium

Topic
Chemistry

Link: https://ifory.id/abstract/fngw7ar4xJpy

Corresponding Author
Nur Ducha

Institutions
Unesa

Abstract
Soya is an ingredient that is often added to semen extender as a component of macromolecules. This study aims to examine the effect of adding soy in the Tris base diluent on the quality and integrity of the Senduro goat spermatozoa membrane. Fresh semen was collected from the Senduro Goat using an artificial vagina, then observing the motility, viability, and integrity of the spermatozoa membrane. Fresh semen was diluted in tris base extender with different concentrations of soy, ie 0% (as a control group), 1%, 2%, and 3%. Stability of spermatozoa was analyzed based on the quality of spermatozoa, namely motility and viability, and membrane intebrity. Observation of motility and viability is done every day. Spermatozoa motility was observed under a microscope at 200 X magnification, by two people. Viability of spermatozoa was observed using negosin eosin staining. Spermatozoa membrane integrity was observed using the HOST method. The results showed the greatest motility, viability and integrity of the spermatozoa membrane at the beginning of storage were found in the tris + soya diluent of 2%. But at the end of storage, ie on the second day after storage, the quality of spermatozoa in the control group and the treatment group (2% and 3%) did not differ only. Based on the results of the study it can be concluded that the use of soy in the tris base diluent has not been able to provide optimal protection in Spermatozoa Senduro Goat druing storage at temperature of 4-5⁰C.

Keywords
spermatozoa od Goat Senduro, soya, tris base extender, temperature of 4-5⁰C

Topic
Biology

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

Corresponding Author
Arrival Rince Putri

Institutions
a,b) Department of Mathematics, Andalas University, Kampus Unand Limau Manis, Padang, 25163, Indonesia
*arrivalputri[at]gmail.com

Abstract
The Susceptible Infected and Removed (SIR) model is extended by considering three treatments, without vaccination, vaccination in susceptible individuals, and mutation in disease viruses. Equilibrium points of those models were determined. Stability of those models was analyzed and associated with threshold parameters. Analytical result was confirmed by numerical result showing plot solution and behaviour of the system in phase plane. The results of this study inform parameters that affect stability of the system so that the best policy to prevent endemic can be proposed.

Keywords
Epidemic model; Vaccination; Mutation; Stability; Numerical

Topic
Mathematics

Link: https://ifory.id/abstract/DBxn6baHGLYT

Corresponding Author
Intan Nurma Yulita

Institutions
Padjadjaran University

Abstract
Autism spectrum disorder (ASD) is a developmental disorder that affects communication and behavior. ASD can be seen in children since toddlers. The knowing toddler has ASD is very important. It can anticipate as early as possible to minimize the worsening of ASD. It can be done by early detection. The mechanism is recognizing patterns form existing data to build detection models. The system can be built using machine learning mechanism. It has been widely used to help diagnose medical data. Support Vector Machine (SVM) is a method in machine learning. This study implemented it in the data which came from 1054 ASD patients. The study also compared the method to other machine learning methods. The results were obtained that SVM accuracy is higher than others. The SVM obtained an accuracy of 99.90%. It shows that SVM promising tool for the diagnosis of ASD.

Keywords
Autism Spectrum disorder, Machine Learning, Support Vector Machine, Toddler

Topic
Computer Science

Link: https://ifory.id/abstract/zer9FnxcX6gp

Corresponding Author
Lydia Rohmawati

Institutions
Universitas Negeri Surabaya

Abstract
Nanoparticles CaCO3/MgO by variation percent weight of MgO (5, 21, 22, 23, 24, and 25) wt.% potentially antibacterial can be synthesized by mixing methods and calcination at temperature 800 oC, which synthesis CaCO3 from shell fish (Anadara granosa) using carbonation methods by flow velocity of CO2 gas 2.8 liter/min. The successful nanoparticles were characterized by BET, antibacterial activity and PSA. Variation percent weight of MgO was used to determine pore size, surface area and antibacterial activity on nanoparticles CaCO3/MgO. The results showed that weight percent variation of MgO have different pore size and surface area that are included in the mesoporous category. CaCO3/MgO (5wt.%) has the smallest surface area (3.24 m2/g) and the largest pore size (20.12-29.35 nm), while CaCO3/MgO (24wt.%) has the largest surface area (65.05 m2/g) and the smallest pore size (3.23-3.59 nm) by the closed end of curve. The tip end of curve obtained at the sample CaCO3/MgO (21wt.%) which has the largest antibacterial activity by inhibitor diameter 31.0 mm on Staphylococcus aureus and 33.0 mm on Escherichia coli bacteria. The optimal nanoparticles has particle size <200 nm.

Keywords
synthesis, characterization, nanoparticles, CaCO3/MgO, antibacterial

Topic
Physics

Link: https://ifory.id/abstract/Z34FjypnDW9x

Corresponding Author
Asyifa Rizqi Utami

Institutions
a) Laboratory of Analytical Chemistry, Bandung Institute of Technology, Jalan Ganesha 10, Bandung 40132, Indonesia
asyifarizqi[at]students.itb.ac.id
b) Analytical Chemistry Research Division, Bandung Institute of Technology, Jalan Ganesha 10, Bandung 40132, Indonesia
zulfikar[at]chem.itb.ac.id
c) Organic Chemistry Research Division, Bandung Institute of Technology, Jalan Ganesha 10, Bandung 40132, Indonesia
deana[at]chem.itb.ac.id

Abstract
A novel magnetic molecularly imprinted polymer (MMIP) was prepared for the recognition of di(2-ethylhexyl) phthalate, using methacrylic acid as a functional monomer, ethylene glycol dimethacrylate as a crosslinker and benzoil peroxide as an initiator. MMIP was characterized using Scanning Electron Microscope and infrared spectrophotometer. IR spectrum show successfull preparation of MMIP. The peak at 586 cm-1 is a typical vibration of Fe-O. The strong peaks at 1728 cm-1, 1261 cm-1 and 1153 cm-1 correspond to the C=O stretching vibration and C-O vibration of methacrylic acid and DEHP. The peak at 1462 cm-1 corresponds to C-C aromatic vibration of DEHP. A broad absorption band at 3468 cm-1 correspond to the stretching vibration of O-H bonds. Experimental results show the potential of magnetic molecularly imprinted polymer for selective recognition of di-(2-ethylhexyl) phthalate.

Keywords
di(2-ethylhexyl) phthalate, imprinted polymers, magnetite

Topic
Chemistry

Link: https://ifory.id/abstract/YvJpfDPZ2jAm

Corresponding Author
Rudi Rudi

Institutions
Universitas Pendidikan Indonesia

Abstract
Teachers- ability in overcoming to student errors is significantly affected by teachers- knowledge. Discussion and studies related to what knowledge teachers should possess have resulted in a theoretical framework. This article aims at describing teacher knowledge to responding to student errors in Pythagorean Theorem proof using a didactic mathematical knowledge approach. This research applies qualitative design. Five junior high school mathematics teachers in Indonesia participate in this study. Data were collected using written tests on teachers- competence and structured interview. Research findings show that two participants cannot accurately answer the questions in the instrument which measures teachers- mathematical knowledge needed to overcome student errors. Another finding indicates that those teachers who do not possess mathematical knowledge in dealing with student errors are also not completed with good didactic knowledge, especially on cognitive, epistemic, ecological, and interactional aspects. Based on the analysis of participants- responses, it can be concluded that teacher knowledge to overcome student errors in Pythagorean Theorem proof is significantly affected by other knowledge components.

Keywords
Didactic mathematical knowledge, Pythagorean Theorem proof, student errors, teacher knowledge

Topic
Mathematics Education

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

Corresponding Author
Suprih Widodo

Institutions
1Universitas Pendidikan Indonesia, Jl. Dr. Setiabudhi 229, Bandung 40154, Indonesia

2PPPPTK TK dan PLB, Jl. Dr. Cipto No. 9, Bandung 40171, Indonesia

Abstract
This research aims to analyze students- understanding when fraction is taught with multiple representations. The respondent 27 student of the 7th graders in the junior high school. The research approach was qualitative. The data were collected through paper and pencil measure, observation, and interview. The data were analyzed by grounded theory with coding and constant comparison. The results showed two types of students- understanding, there are procedural understanding (syntax thinking) and conceptual understanding (semantic thinking). The findings are then elaborated using some related theories to justify the results

Keywords
Fraction, Multiple representation

Topic
Mathematics Education

Link: https://ifory.id/abstract/CVdXkR4EnNfh

Corresponding Author
Sariwulan Diana

Institutions
Departemen Pendidikan Biologi, Universitas Pendidikan Indonesia

Abstract
A research about the achievement of 21st century students- plant literacy by field trip implementation has carried out, in which it aims to improve students- plant literacy. This study used an quasi-experimental method, non-equivalent control group design. This design includes a group of students observed in the pretest phase which is then followed by treatment with field trip implementation and ends with posttest. The same applied to the control group, which only did conventional lab. The 21st century plant literacy is critical thinking and problem solving regarding the concept of plant diversity. Field trip includes determining the aspects to be observed, carrying out observations and collecting data and discussion of results and reporting. Research instruments include a set of plant literacy questions and its rubric, worksheet for field trip students and its rubric, and questionnaire about student response to the implementation of field trip. There was a slight increase (N-gain 0.16) of students- plant literacy in the experimental class and the control class (N-gain 0.23). Although not significantly different from the control class, but the achievement of 21st century students- plant literacy have potential to develop through field trip implementation. All students respond positively to the field trip implementation.

Keywords
Field trip, 21th century plant literacy, critical thinking and problem solving

Topic
Biology Education

Link: https://ifory.id/abstract/FVua9BRLxDqg

Corresponding Author
Ferry Ferdianto

Institutions
Universitas Swadaya Gunung Jati

Abstract
Teacher Professional Education (PPG) is professional education in Higher Education after an undergraduate program that collects students in the field of work that requires special competence. The purpose of this research was to find out PPG students- mistake in learning daring process. The methode used for this research is descriptive qualitative from chat in daring learning. This research samples were students of PPG grade from one public school in Cirebon, Central Java, Indonesia. The analysis of PPG students mistake used the instrument of chat in daring learning process. The module 6 in daring learning process consists of 4 learning competencies that consist of 2 topics in learning daring process. The result showed that majority of the students have responded to the topic presented by the instructor, while few of them made mistakes in answering the topic of the problem given by the instructor. Students make reading mistakes and misunderstanding, reading stage students- cannot interpret the sentences they read well, understand problems (comprehension).

Keywords
analysis of students mistake, reading mistakes, and comprehension

Topic
Integrated Science Education

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

Corresponding Author
Ferra Yanuar

Institutions
Department of Mathematics, Faculty of Mathematics and Natural Science, Andalas University, Kampus Limau Manis, 25163, Padang – Indonesia

Abstract
The Dengue Fever is an infectious disease which has always been one of the main health problems in Indonesian society. Dengue Fever is transmitted by Aedes Aegypti mosquito bites. The purposes of this study is to estimate the relative risk of spreading the dengue fever disease in Padang. Estimation is done using the Small Area Estimation method with the Empirical Bayes approach. Small area estimation is useful for estimating parameters in small subpopulations (areas) which have limited number of samples thus acceptable parameter values are hard to be obtained. In this study the construction of the model is based on Poisson-Gamma model and secondary data from Dinas Kesehatan Padang 2017 is used. This study resulted that for each district in Padang, the average relative risk of the spreading of dengue fever is almost the same, which are at medium and low level.

Keywords
Dengue Fever, Empirical Bayes, Small Area Estimation, Poisson-Gamma model

Topic
Mathematics

Link: https://ifory.id/abstract/TtFh8jm3REW9

Corresponding Author
Susila Bahri

Institutions
Andalas University

Abstract
In this study, the mathematical model for changing active sentence to passive sentence in Indonesian language is constructed. In the construction process, the ten types of words are expressed as vertices on directed graphs called sentence graphs. The edges of the graphs are weighted with positive integers in the order of words in the sentence. The graph is then expressed as an adjacency matrix. The matrices form vector spaces. Finally, a linear transformation is carried out to get a sentence graph.

Keywords
changes active sentences to passive, sentence graph, adjacency matrix, linear transformation

Topic
Mathematics

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

Corresponding Author
Eni Nuraeni

Institutions
UPI

Abstract
This study aims to obtain information and to analyze the biological - mathematical attitudes of students in quantitative literacy- based ecosystem instruction. The research used a quasi-experimental design with 131 six grade students in two high school.. The Biological - mathematical attitude was obtained with the Math-Biology Values Instrument (MBVI) questionnaire and quantitative literacy was asses with multiple choice questions. The results shows that majority of students feel interested, feel the benefits and feel the importance of mathematical abilities in solving biological problems, and almost all students do not feel difficulties with mathematics in ecosystems instruction. Student very high interpretation and calculation abilities as well as high representation and analysis skills.

Keywords
MBVI, biological-mathematical attitude, quantitative literacy, ecosystem

Topic
Biology Education

Link: https://ifory.id/abstract/LZDP7ek3mWMC

Corresponding Author
Anita Ahmad Kasim

Institutions
1)Departemen of Information Technology, Tadulako University, Palu, Indonesia

2)Department of Architecture, Tadulako University, Palu, Indonesia

3)Department of Computer Science, Mulawarman University, Samarinda, Indonesia

Abstract
The problem in this research is the difficulty in distinguishing batik motifs from non-batik motifs for people who do not understand batik motifs. The classification of batik motifs can be done by processing digital images of batik motifs using artificial neural network methods for the classification of batik image motifs. This study aims to utilize artificial neural networks to distinguish batik motifs and non-batik fabric motifs. Several important steps are needed, namely the process of acquiring batik and non-batik images, pre-transforming batik and non-batik images to gray scale forms, texture feature extraction in gray scale images and detection of motifs using networks artificial nerve. Image acquisition is done by collecting batik and not batik images from several different motifs. The preprocessing process is done by changing the image size to 256 x 256. Sixteen texture features are used, namely Angular Second Moment (ASM), contrast, correlation and Inverse Different Moment (IDM) with 45 ° angle intervals, namely 0 °, 45 °, 90 ° and 135 °. Processing data sets is divided into 70 percent as training data and 30 percent as testing data. Artificial neural network models used in this research use the Backpropagation learning algorithm by comparing the Scaled conjugate gradient algorithm (trainscg) training method and the Levenberg-Marquardt algorithm (trainlm) training method. The results obtained for the accuracy of the batik detection model using the Scaled conjugate gradient algorithm (trainscg) training method were higher with an accuracy value of 86.7%, compared to the Levenberg-Marquardt algorithm (trainlm) method by 73.5%.

Keywords
batik,textura features,ANN

Topic
Computer Science

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

Corresponding Author
Judhistira Aria Utama

Institutions
a) Department of Physics Education, Universitas Pendidikan Indonesia, Jalan Dr. Setiabudhi 229, Bandung 40154, Indonesia
*j.aria.utama[at]upi.edu
b) Department of Computer Science Education, Universitas Pendidikan Indonesia, Jalan Dr. Setiabudhi 229, Bandung 40154, Indonesia

Abstract
Orbital computation of 3,372 real near-Earth asteroids (NEAs) population was conducted and their orbital evolution was recorded every 1,000 years for the next 5 Megayears (Myr). This study is aimed to detect asteroids in 1:1 mean-motion resonance (MMR) with planets. In order to achieve our goal, we employed N-body numerical simulation with the use of Swift-RMVS (Regularized Mixed-Variable Symplectic) integrator. We found that NEAs population could have evolved into asteroids in a co-orbital state with Terrestrial planets (Mercury to Mars). For the detection of this co-orbital condition a time series of motif discovery algorithm known in computer science was applied to asteroids orbital elements. The predicted results of the experiments carried out were then compared with one of the standard tool in astronomy, which showed that our model could prove the location of the motif and the duration of the asteroid in co-orbital state with each Terrestrial planets.

Keywords
Co-orbital state; Motif discovery; Near-earth asteroids; Orbital elements; Time series

Topic
Physics

Link: https://ifory.id/abstract/crY8VdbXGZRt

Corresponding Author
Dyah Marganingrum

Institutions
a) Reserach Centre for Geotechnology – Indonesian Institute of Sciences
b) Kelompok Studi Media Energi Nusantara

Abstract
Bottom ash (BA) is waste categorized as B3 and requires special handling and costs. BA become as an interesting issue since the coal using increase in various industries as a fuel. In another case, municipal solid waste (MSW) generation become the environmental problem in the urban area. This paper aims to utilize these two wastes to products and solution of environmental problems as well. The method used in this study is briquetting from BA and fermented of MSW called Biomassed Coal Fermented (BCF) briquettes. The formulations used 60% BA and 40% MSW. The BCF briquettes were tested in boiler 1 which fixed bed type at the kind textile industry. The results showed that with 10% substitution of BCF briquettes for coal use, combustion efficiency increased by 48%. The measurements of air emissions showed a value below of the air quality standard for particulate, SO2, and NO2. When compared with boiler 2 which is without substitution (100% using coal) the particulates and NO2 increased 28% and 2% respectively then SO2 decreased 67%. This interim trial showed the potential of BCF briquettes can be an alternative fuel while reducing the generation of BA and MSW.

Keywords
air quality standards; bottom ash; emission; fermentation; municipal solid waste

Topic
Physics

Link: https://ifory.id/abstract/b74kxF6Wa2Xr

Corresponding Author
Arief MUTTAQIIN

Institutions
a) Department of Biology, Universitas Negeri Padang, Jl. Prof. Dr. Hamka, Air Tawar Padang 25131, Indonesia
b) Department of Science Education, Universitas Negeri Padang, Jl. Prof. Dr. Hamka, Air Tawar Padang 25131, Indonesia
*muttaqiin.a[at]fmipa.unp.ac.id

Abstract
Research in education is based primarily on the problems that have found in the field. The habit of memorizing the concept make the students- thinking skill is not developed. This research aimed to enhance the students‘ higher-order thinking skills through the Concept-Based Learning and Drill Method in The Course of Biology Learning. The concept-based learning leads students to know the basic concept and avoiding misconceptions, while the drill method is unique due to its characteristics, which make students think higher than before. Therefore, the combination of concept-based learning and drill method were applied in the course of Biology Learning Methodology as an attempt to obtain the positive effect of the strategy. A set of higher-order thinking skills questions were given at the end of the course. The implementation of concept-based learning and drill method in this course made students obtained a high score which the average classroom score was 77.87, classified as B+. Implementing the concept-based learning and drill method can be used as an alternative to help students in improving their higher-order thinking skills in Biology Learning Methodology course.

Keywords
concept, drill, higher-order thinking

Topic
Biology Education

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

Corresponding Author
Manihar Situmorang

Institutions
Universitas Negeri Medan

Abstract
The design of sensitive, selective and reproducible biosensors with enzyme immobilisation for analytical application is reported. The study is aimed to develop a versatile and accurate analytical tool to be applicable for the determination of target analytes in real samples. The biosensor device is developed with employ immobilised enzyme as catalyic agent to convert target analytes to product that can be monitored electrochemically. Electrochemical biosensors, both in amperometric and potentiometric detection system have been prepared for different types of analytes. The strategy to immobilise ezyme in a matrix polymer is explained. Analytical performances of the the biosensors have been evaluated based on their detection sensitivity, linearity detection range, limit detection, selectivity, and stability. The enzyme electrode is prepared by immobilization of enzyme throughout polytyramine membrane film and attached tightly onto the surface of electrode. The working electrode was made via electropolymerization of monomer tyramine on an electrode surface from a mixed phosphate buffer/methanol solution containing enzyme at pH 6.0 followed by covalent attachment using EDC/NHS crosslinking agents. The precise control over the charge passed during deposition of the polytyramine polymer allows concomitant control over the thickness of the deposited enzyme layers onto the surface of the electrode. The reproducibility of the biosensors achieved is certainly due to the control of the thickness of the enzyme layer being limited by the resistance of the polytyramine film, and to the enzyme immobilization procedure on to the surface of the electrode. The biosensor showed good stability and to be applicable to determine analytes in real samples. Amperometric biosensor has been developed for the determination of various types of analytes such as glucose, sulfite, and uric acid. Potentiometric biosensor has also been developed with the same procedures for determination of analytes such as malic acid, cholesterol, and urea. The biosensor showed good stability and applicable to determine analyte in real samples.

Keywords
Electrochemical biosensor; Reproducible; Enzyme immobilisation; Potentiometric; Amperometric; Polytyramine matrix

Topic
Chemistry

Link: https://ifory.id/abstract/bCZymf3AYwL4

Corresponding Author
Sukarno Sukarno

Institutions
Jurusan Pendidikan Fisika, fakultas Tarbiyah dan Keguruan Universitas Islam negeri Sulthan Thaha Saifuddin Jambi

Abstract
This study aims to improve pedagogical abilities of prospective Physics teacher students through a learning model. The Explaining-Doing (EXDO) learning model is one of the artistic models in developing student pedagogical abilities. The implementation of the EXDO model for prospective students of physics shows that pedagogical abilities have increased. The intended pedagogical ability includes the ability of prospective physics students in determining Learning Indicators, Learning Objectives, Learning Materials, Learning Methods, Learning Media, Learning Steps, Determining Learning Resources, Scientific Content, and Assessment of Learning Outcomes. Based on the data obtained, it can be seen that the highest normalized N-gain value is obtained by the component "subject matter", namely 93.16% and "determining learning resources" which is 91.74%. The lowest N-gain is achieved by the component of "learning outcomes assessment" which is equal to 71.79%. This shows that students pedagogical abilities in developing "subject matter" and "determining learning resources" and are difficult in "learning outcomes assessment". However, when referring to the normalized N-gain average value of 85.47%, it means that there has been an increase in pedagogical abilities of prospective physics teacher students during the implementation of the EXDO learning model.

Keywords
EXDO model, pedagogy, Physic prospective teacher

Topic
Physics Education

Link: https://ifory.id/abstract/eV4Phvj3zMtT