Indonesia Conference Directory

Corresponding Author
Agus Fany Chandra Wijaya

Institutions
Universitas Pendidikan Indonesia

Abstract
Indonesia-s Education, must admit, student-s learning achievement is one of the crucial aspect need to be improve and develope through the learning process now a day, the fact that meaningful learning process is the key of the situation (Arianto & Rubini, 2016; Bilgin & Karaduman, 2005; Rustaman, 2003). Furthermore, Education for Sustainable Development (ESD) can be infuse into the curriculum through three different strategies, which are, ESD on Curriculum or ESD provide context for the teaching and learning process, ESD in Curriculum or ESD become a part of the subject content and context, and Curriculum of ESD or ESD as a subject it selves (Wijaya, 2018). Therefore, the research aims are to describe and analize the implementation of ESD on Curriculum in Junior and Senior High School effects toward the pupil-s cognitive achievement and sustainability awareness, and also the prospective teacher student-s perception. Utilize the mixed method research, this study probe 156 junior and senior high school pupil-s from five different school and five prospective teacher student-s achievement and perception through the science teaching and learning activities. There are three different result point of view, the pupil-s cognitive achievement, the pupil-s sustainability awareness, and the student-s perception on preparing and implementaing infusing ESD on the curriculum. The first result revealed that overall student-s cognitive achivement profile improved significantly after the implementation of ESD on science curriculum in junior and senior high school level. Secondly, student-s sustainability awareness profile on the implementation of ESD on science curriculum with the dominant of hands-on teaching and learning activities achived the highest level of awareness for all of the aspects while the less dominant of hands-on teaching and learning activities only achived the highest level of awareness on emotional and behavioral aspects. Thirdly, the perception of undergraduate student-s toward their ESD on science curriculum implementation in junior and senior high school level, in general, student-s perception are on the Organization stage and the Interpretation stage which mean developed well through the implementation process.

Keywords
ESD, ESD on Curriculum

Topic
Integrated Science Education

Link: https://ifory.id/abstract/bfB7eNwLGV4H

Corresponding Author
Winda Ramadianti

Institutions
Universitas Pendidikan Indonesia

Abstract
Fractions is one of the basic topics in mathematics. Knowledge about fraction relates conceptual knowledge and procedural knowledge. Therefore, the instructions about fractions have to consider them. To investigate ways of conceptual knowledge and procedural knowledge at mathematics instruction in junior high school, we observed mathematics instruction in two different classes which were taught by different teachers. This research was conducted at a junior high school in Bengkulu, Indonesia. The results showed that procedural knowledge was discussed more than conceptual knowledge. In addition, the study also found that almost procedural knowledge has not yet been connected with conceptual knowledge.

Keywords
fraction, procedural knowledge, conceptual knowledge

Topic
Mathematics Education

Link: https://ifory.id/abstract/4gkfdLDMzHEQ

Corresponding Author
Muhammad Junda

Institutions
Dept of Biological Science, Faculty of Mathematics and Natural Sciences, Makassar State University

Abstract
The objective of this study is to investigate the production of white leg shrimp, L vannamei by application of biofloc technology on intensive shrimp grow out ponds. This study was carried out on five of shrimp grow out ponds with different pond size and zero water exchange management strategy. These shrimps were reared with intensive systems such as shrimp seed post larvae (PL) 10, commercial feed, aeration with paddle wheels, mineral, vitamin and molasses as well as floc-forming microbes and natural herb fermentation. Shrimp grow out ponds with condition as follows : water depth, 90 – 120 cm, feeding rate four times a day, aeration 24 hours in cultured period. Water quality indicators were measured ever day such as : survival rate, average daily gain, mean body weight, and feed conversion ratio. The results of this study showed that shrimp yield were 1,250 – 6,300 kg, growth rate such as : ADG, 0,32 – 0,40; survival rate 85 – 95 %; MBW 20, 23 – 27.30 and FCR = 1.10 – 1.20. Water quality parameters : pH = 7,2 – 9.5; salinity : 15 – 25 ppt ; temperature : 28 – 31 0 C; water depth : 90 – 120; tranparancy : 25 – 40; dissolved oxygen : 3.0 – 5.2; . In conclution, Application of biofloc technology with zero water exchange increased shrimp production significantly and water quality parameters were in range suitable for shrimp cultured growth.

Keywords
application biofloc technology, intensive production, Litopenaeus vannamei, zero water exchange.

Topic
Biology

Link: https://ifory.id/abstract/F3482b6j9qcU

Corresponding Author
Wiwi Siswaningsih

Institutions
Departement of Chemistry Education, FPMIPA UPI

Abstract
This research aimed to find out the profile of misconception in senior high school students on the concept of acid base strength and the factors caused it. The research design used was qualitative descriptive. The data collection technique was carried out by two tier pictorial multiple choice diagnostic tests on the concept of acid base strength modified by researcher from previous developer, which consist of seven items and had been valid and reliable. In addition, the data was collected by using questionnaire, interview with students identified as having misconceptions and the chemistry teachers who taught the students, and documentation of chemistry textbook. The findings showed that: (1) students were identified as having misconceptions on the concept of acid base strength; (2) the biggest misconception was the target concept of the relationship between acid strength and pH with a percentage of 51.52%; (3) student misconception was caused by various factors, namely the condition of students, experiences, teachers, and textbooks.

Keywords
acid base strength, diagnostic test, misconception, profile, two tier multiple choice test

Topic
Chemistry Education

Link: https://ifory.id/abstract/rWU7ATkbCnHP

Corresponding Author
Dewi Muliyati

Institutions
Physics Education Department, Universitas Negeri Jakarta

Abstract
Understanding physics concept will be easier if the material can be presented in various forms. Quick Response Code (QR–Code) can provide additional material in the form of videos, PPTs, or website to facilitate the learning of physics concept. The methods used in this study is research development (Research and Development), Dick and Carey model with the following steps: identify instructional goals, conduct instructional analysis, identify entry behaviors and learner characteristics, write performance objectives, develop criterion-referenced test items, develop instructional strategy, develop and select instructional materials, develop and conduct formative evaluation, revise instruction, develop and conduct summative evaluation. This study produced textbooks equipped with QR–Code for 12th-grade physics in the odd semester to display physics the materials enriched with various forms of media making it easier for students to understand the concepts learned.

Keywords
Textbook, Research and Development, QR code, High School Physics

Topic
Physics Education

Link: https://ifory.id/abstract/QrGUDLck37He

Corresponding Author
Athif Naufal Mufid

Institutions
Departement of Physics Education
Indonesia University of Education

Abstract
This re-design of physics learning chapter optical instruments for senior high school level is designed based on the analysis of students responses to the competency domain of scientific literacy, the aspects of this domain are explaining scientific phenomena (K1), evaluating and designing scientific research (K2) and interpreting data and scientific evidence (K3). The results of the study from the samples showed indications of difficulties in the domain of competence in aspects K2 and K3 so that competency could not be achieved properly. The Marzano-s Learning Dimension (MLD) can build positive attitudes and perspectives both in the formation, refinement, and application of knowledge to produce Habits of Mind (productive thinking habits). In order for better learning interaction process, students need to be given sufficient knowledge through the use of reading infusion strategies. In order to practice scientific literacy competencies, it is necessary to build an investigation through contextual experimental activities, therefore in this optical instrument chapter, several experiments are built which are about determining the strength of eyeglass lenses, making simple projectors and making simple microscope designs.

Keywords
Scientific Literacy Competency, Marzano-s Learning Dimension, Reading Infusion Strategy, Optical Instruments.

Topic
Physics Education

Link: https://ifory.id/abstract/2G4teP7dn6AM

Corresponding Author
Didi Suhaedi

Institutions
Program Studi Matematika, Universitas Islam Bandung

Abstract
Algebra thinking is one of the abilities students must have in learning school algebra. The weak algebraic thinking ability of junior high school students is one part of the problems in mathematics education. One effort to solve these problems is to innovate learning with a realistic mathematics education approach. This study is a quasi-experiment about improving students algebraic thinking abilities, with the experimental class using the realistic mathematics education approach and the control class using conventional learning. The research sample consisted of 134 eighth grade students of junior high schools in Bandung. The results of the study show that increasing the algebraic thinking ability of students who get learning with a realistic mathematics education approach is better than students who get conventional learning at every level of students initial mathematical knowledge.

Keywords
school algebra, algebraic thinking, realistic mathematics education

Topic
Mathematics Education

Link: https://ifory.id/abstract/7kcK3j2BGzTe

Corresponding Author
Muhammad Alimahdi

Institutions
Indonesia University Of Education

Abstract
This didactic redesign apply strategy reading infusion (SRI) and using Marzano-s Learning Dimension (MLD) is based on student responses to literacy scientific competencies (LS) which is indicate that students still weak related to aspects of evaluate and design (K2) and interpreting data and scientific evidence (K3) on sound wave chapter. To train this competence learning develop experimental topic that is contextual like experiment of analyzing sound wave damping material, determine standard tuning on the guitar, and calculate velocity of sound wave with doppler effect through the use of smartphones, the experiments that were presented is designed to facilitate scientific literacy competence and reading infusion is used to insert knowledge so that the students have enough knowledge, this is as able to develop attitudes and positive perspectives and productive thought process during knowledge formation, refinement of knowledge and application of knowledge.

Keywords
Literacy scientific competence, Marzano,s learning dimension, and reading infusion

Topic
Physics Education

Link: https://ifory.id/abstract/r9RpFwQHvZ3K

Corresponding Author
Maiya Haejelia

Institutions
a) Magister of Mathematics Education, University of Lampung
Jl. Prof. Dr. Sumantri Brojonegoro No.1, Bandar Lampung 3514, Indonesia
*Maiyahaejelia06[at]gmail.com
b) Department of Mathematic and Science Education, University of Lampung
Jl. Prof. Dr. Sumantri Brojonegoro No.1, Bandar Lampung 3514, Indonesia

Abstract
Thinking reflectively is an ability to connect the knowledge that he get with his old knowledge, so that there is a conclusion to solve a new problem. In order to motivate students to solve the problems given, the researcher wants to link the mathematical problems given to students by linking something close to students who contextualize local content in the local area. This research was to describe student-s reflective thinking in solving mathematics problem for triangle and quadrilateral. This research used qualitative descriptive research with the students of VIII A Class at SMP Negeri 17 Pesawaran as the research subject. Intsrument that was used were written test in the form of 4 description questions and interview guidelines. From 34 students of VIII A class who took the test there were 5 students who followed the interview. The five subjects was students who fulfill all of reflective thinking indicators then to be subjected for the research. Based on the research it was obtained a result that from five students there were three subjects who were able to think reflectively in solving mathematic questions and two subject was able enough to think reflectively in solving mathematic question.

Keywords
Keyword: Thinking Reflectively, Solving Mathematics proble, local content.

Topic
Mathematics Education

Link: https://ifory.id/abstract/AXMc3pDPzJqn

Corresponding Author
Budi Laksono Putro

Institutions
Computer Science Education Department
Faculty of Mathematics and Science
Indonesia University of Education
Bandung, Indonesia

Abstract
Information technology is widely used in work management because of its effectiveness and efficiency which have been proven to be able to accelerate performance. But to achieve this, it is necessary to have good and correct IT management. The problem is that there are often differences between the initial requirements and the actual requirements the customer wants. To solve these problems an engineering approach was implemented which eventually became Requirements Engineering. With the application of these methods, it is expected to produce software that suits user needs. The system used in this study is one of the systems found at the Indonesian Education University called the Integrated Online Learning System (SPOT). This system is a web-based application system that can be used to replace face to face or as a complement to learning. This research was made using the WebQual 4.0 method with three main dimensions of WebQual namely Usability, Information Quality and Service Interaction. This research was conducted using a questionnaire and tested through a classic assumption test and regression analysis. The population of this study were students and lecturers at Indonesian university of education. From the calculation process the results obtained from the usability variable of 3,797 with an average of 474,625, which means the SPOT system is easy to use among students and lecturers, the Information Quality variable is 3215 with an average of 459.28 which means that the information conveyed through the SPOT system is of high quality , Service Interaction Quality variable of 3097 with an average of 442.42, which means that the SPOT system service is of high quality.

Keywords
Requirement Engineering, WebQual 4.0, Usability, Information Quality,Service Interaction

Topic
Computer Science Education

Link: https://ifory.id/abstract/GMXbZH98xf4J

Corresponding Author
Raissa Mataniari

Institutions
(a*) and (b): Universitas Jambi
Jl. Lintas Sumatera Jl. Jambi - Muara Bulian No.Km. 15, Mendalo Darat, Kec. Jambi Luar Kota, Kabupaten Muaro Jambi, Jambi 36122

Abstract
The need of improving student creativity ties in with efforts teachers need to implement in science learning. Thus, Research Skill Development (RSD) framework with analogy method was applied in this study, aiming to improve student creativity skills by prompting students to constantly create analogies in science learning. RSD framework was introduced for the purpose of articulating and scaffolding student skills, creativity is one of them. In this project, an RSD-structured analogy method was implemented as an initiative to enhance creativity skills of students in Indonesian context. The participants in this study were 30 Junior High School students studying science. The results provoked discussion on the ways that RSD-structured analogy method effectively improved student creativity skills, based on the improvement of student creativity skills measured by attitude scales consist of 5 creativity skill indicators.

Keywords
Research Skill Development; Analogy Method; Creativity Skills

Topic
Integrated Science Education

Link: https://ifory.id/abstract/W72gKM4hcyj9

Corresponding Author
Raissa Mataniari

Institutions
(a*), (b), (c) and (d): Universitas Jambi
Jl. Lintas Sumatera Jl. Jambi - Muara Bulian No.Km. 15, Mendalo Darat, Kec. Jambi Luar Kota, Kabupaten Muaro Jambi, Jambi 36122

Abstract
Communication is essential for scientific learning, yet academics and casual staff struggle to develop student communication skills in effective ways. Therefore, the integration of a Research Skill Development (RSD) framework with Flashcard Quiz method in an Indonesian Junior High School science course is examined in this study, with a focus on improving student communication skills. Action research was conducted in one class, to provide a rich and detailed understanding of the factors involved in this integration. Data from field notes, written responses, teacher records and teaching materials were collected. The results manifest the improvement of student communication skills, measured by attitude scales consist of 10 communication skill indicators. Recommendations made for future implementation of this project include the need of more credible learning sources and interactive science practices. The teacher perceived that the projects- applications may empower other teachers to use the RSD-integrated Flashcard Quiz method.

Keywords
Research Skill Development; Flashcard Quiz Method; Communication Skills

Topic
Integrated Science Education

Link: https://ifory.id/abstract/D8zWKVkpfB4d

Corresponding Author
Elok Sudibyo

Institutions
Universitas Negeri Surabaya

Abstract
This study aims to develop Student Science Worksheets that are Science Process Skills oriented. One of the criteria that the developed Science Worksheet is feasible for use is in terms of practicality. The practicality of the worksheet is captured with the Student Response Questionnaire instrument. Respondents in this study were 55 Junior High School students, consisting: 29 students of Al-Falah Junior High School Surabaya and 26 students of Al-Falah Junior High School Sidoarjo. The results showed that the developed worksheets could be used well by Junior High School students. In addition, the majority of students (96.16%) stated that the use of Science Worksheets the Science Process Skills oriented could make learning activities interesting and enjoyable.

Keywords
science worksheet, science process skills

Topic
Integrated Science Education

Link: https://ifory.id/abstract/WuXmkdp27j6V

Corresponding Author
Dewi Murni

Institutions
UNP

Abstract
Low Birth Wieght (LBW) is one of the factors triggering the occirence of infant mortality in the neonatal period. Factors affecting the risk of low birth weight is a factor of maternal death, fetal factors, infant birth weight factors and socio economic factors. That this study aims to look at the factors that affect the risk of death LBW base on the chance of death factors. One statistical analysis used in looking at the relationship of LBW risk of death is the Cox regression model. The results of this study indicate that the factors that influence the risk of LBW death are gestational age and infant birth weight. Opportunity risk of death for LBW who have gestational age <37 weeks is 8.424 times greater than the LBW who have ≥37 weeks gestation. Then chances LBW risk of death with birth weight <1499 gr was 8.547 times greater than the LBW with birth weight 1500-2499 gr.

Keywords
LBW, neonatal, Cox Regression

Topic
Mathematics

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

Corresponding Author
Siswanto Siswanto

Institutions
a) Department of Natural Science Education,Universitas Tidar, Magelang, Indonesia
*siswanto[at]untidar.ac.id
b) Department of Primary Teacher of Education, STKIP Taman Siswa Bima, Bima, Indonesia
c) Department of Physic Education, STKIP Bima, Bima, Indonesia
d) Department of Physic, Universitas Negeri Semarang, Semarang, Indonesia

Abstract
Argumentation skills have to be mastered and owned by students of college. To investigate these, mapping the characteristics of students- written argument should be revealed. Therefore, this study aims to map how students- written arguments are categorized. A content analysis is a research method utilized in this study. Students written argument of electricity and magnetism from 22 participants are analyzed. The analysis of mapping the written argument is divided into two parts. First, analysis is focused on considering argumentation components without scientific level. Finding of research portrays that level 2 (i.e. Data, Claim and or Warrant) dominates. Second, analysis is emphasized in argumentation components and scientific level of arguments. The result of research depicts that the category of Scientifically Unacceptable-Incorrect Scientific Knowledge (SU-2) is dominant. Its implication is a written argument should be taught to students comprehensively. Both component and scientific level of argument should be mastered by students.

Keywords
Argumentation Skills; written arguments; scientific level of arguments

Topic
Physics Education

Link: https://ifory.id/abstract/XV2wc3zbxWQ7

Corresponding Author
Desti Nirwana Mozef

Institutions
a) School of Electrical Engineering and Informatics, Bandung Institute of Technology Jalan Ganesha 10, Bandung 40132, Indonesia
b) School of Electrical Engineering and Informatics, Bandung Institute of Technology Jalan Ganesha 10, Bandung 40132, Indonesia

Abstract
Being a part of smart grid, smart meter is a device that is widely used nowadays because it is expected to improve the efficiency of the current electricity network by using advanced digital information and communication technology. One of the advantages of using smart meter is it can simplify the billing process. However, because the smart meter system must be connected to intranet and extranet networks, it becomes vulnerable to several security and privacy threats. One of the major concerns is pricing cyber-attack, which happens when energy consumption data becomes the target of an attack because this can affect the amount of billing that must be paid by costumers. There are already several studies that discussed about securing smart grid system using various methods but those are still computationally complex and only implemented on time-based type smart meters. The aim of this paper is to present a preliminary research of securing an event-based smart meter system from pricing cyber-attack.

Keywords
Smart grid; Smart meter; Pricing cyberattack

Topic
Computer Science

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

Corresponding Author
Syafruddin Side

Institutions
1Department of Mathematics, Faculty of Mathematics and Natural Sciences,Universitas Negeri Makassar

Abstract
This study discusses the process of the SEIRS model on the spread for Hepatitis B. The mathematical model of the SEIRS for Hapatitis B is a model by dividing the population class into four variables namely Susceptible-Exposed-Infected-Recovered-Suspected (SEIRS) which is a four dimensional nonlinear differential equation system. The model obtained analyzed and simulated using data assuming the initial values ​​of variables and parameters and processed using Maple Software. The simulation results provide predictions of the number of Hepatitis B sufferers who can be a preventative solution. If R0>1 , the hepatitis B disease becomes endemic and if R0>=1, the hepatitis B disease will disappear by itself.

Keywords
Hepatitis B, SEIRS Model, Endemic and free disease

Topic
Mathematics

Link: https://ifory.id/abstract/bhV9MX8umGEq

Corresponding Author
Lina Handayani

Institutions
Research Center for Geotechnology
Indonesian Institute of Sciences
Jalan Sangkuriang Bandung 40135

Abstract
Maumere at the north coast of Flores Island has experienced not only large earthquakes but also tsunamis. The earthquake sources in this area include thrust faults (north of the island, Timor Trough, and Sawu Basin), strike-slip fault at the west of the island, and Australian Plate subduction-related movements. In this paper, we reviewed all tectonic aspects and studies on a previous large earthquake. A thorough study of all possible sources and probability seismic hazard analysis indicated that events caused by the Flores back arc thrust has the highest possible effect to the ground attenuation in Maumere.

Keywords
Seismic hazard, Flores back thrust, Maumere

Topic
Physics

Link: https://ifory.id/abstract/yrhjBqA8CHF2

Corresponding Author
Jajam Haerul Jaman

Institutions
Computer Science Faculty of Singaperbangsa Karawang University

Abstract
Body shaming is a form of mocking/insulting action by commenting on the shape or size of the body and the appearance of someone so that someone feels embarrassed. Problems with comments that contain body shaming elements are important things to study as text processing. Sentiment analysis can be used as a solution to identify body shaming comments with the classification method using the Naïve Bayes Classifier algorithm. Naïve Bayes Classifier uses the concept of probability of each class in its classification learning, so that the distance between classes is not large. The purpose of this study is to predict or classify comment data based on shaming and non shaming sentiment classes. The test in this study was carried out with ten different scenarios using the R programming language with RStudio tools which were then evaluated using confusion matrix to determine the best classifier model.. The evaluation results with confusion matrix found that the best model classifier is a scenario with a comparison of training data and testing data 90:10 and applying stemming at the preprocessing. This scenario achieves an accuracy of 98.48% with an error rate of 1.52%. Recall is 99.53%, specificity is 66.67%, precision is 98.90%, and F-measure is 99.21%.

Keywords
Body Shaming; Naïve Bayes Classifier; Sentiment Analysis

Topic
Computer Science

Link: https://ifory.id/abstract/98HrdQgNVWAJ

Corresponding Author
Pradipta Swiantana Prayoga

Institutions
Universitas Pendidikan Indonesia

Abstract
Introduced by Z. W. Birnbaum and W. Orlicz in 1931, Orlicz spaces are generalization of the Lebesgue spaces. There are two kinds version of Orlicz spaces which are continuous Orlicz spaces denoted by (L_Φ) and discrete Orlicz spaces denoted by (l_Φ). The properties of (L_Φ) spaces are already known. The aim of this study is to discuss the properties of discrete Orlicz spaces. We will see that the properties of continuous Orlicz spaces are also valid on discrete Orlicz spaces. Methods in this research are by using the properties of Young function and Luxemburg Norm. The result of this research is to show that several properties of continuous Orlicz space are also valid on discrete Orlicz space.

Keywords
Lebesque spaces, continue Orlicz spaces, discrete Orlicz spaces

Topic
Mathematics

Link: https://ifory.id/abstract/prZVE2Hb7XLD

Corresponding Author
Gita Sukmawati

Institutions
Universitas Pendidikan Indonesia

Abstract
Indonesia is situated in geologically unstable area called the Pacific Ring of Fire which faces the risk of powerful earthquakes with potentially devastating effects. The most effective measure to be taken against earthquake and other natural disasters are knowing what to do when it happens. This issue intended the researcher to build a mobile learning application for earthquake mitigation using game-engine software called Unity 2D. Generally, the process of developing the mobile learning application consist of several steps: (1) preparation stage which consist of problem identification and formulating objectives, literature review, and constructing the instrument; (2) development stage also consist of several stages which are making the flowchart, storyboard, software necessity analysis, hardware necessity analysis, and coding. The method that used in this research was descriptive. The subject was 30 students of Laboratorium Junior High School in Bandung and one science teacher. The experts on content, language and artwork were evaluated the mobile learning application. The result of the experts- judgment content scored 83.33%, 87.5% on language content and reached 93.75% on artwork (IT) aspect. The overall result of mobile learning application for earthquake mitigation is adequately received a good evaluation from every aspect.

Keywords
Earthquake, Android, Mobile learning

Topic
Integrated Science Education

Link: https://ifory.id/abstract/a9uMLp2bWGjD

Corresponding Author
Juang Akbardin

Institutions
Civil engineering of Universitas Pendidikan Indonesia

Abstract
Generating and atracting movements is a phenomenon of need for distribution in a zone in a region. Movement distribution model has an important role to increase economic and regional growth. The model design strategy is determined based on alternative supply and demand generation and the atractionl of movement. The need for strategies to limit supply and demand is determined by restrictions on generation or atraction of movement. The method of limiting the generation or atraction of movement as a distribution system model solution is single constraint. Distribution system modeling with one limitation is based on gravity modeling. Distribution system simulation modeling is built the gravity algorithm. Distribution system starts from constructing generation models with variables that determine the generation of movement. The socio-demographic, infrastructure and freights vehicle are used in this variable modeling. The model was tested with statistical parameters with a test of determination and correlation test. Distribution system modeling is then accumulated in computational models of basic matrices that are defined based on the specified zone. The matrix iteration process in the model calibration will determine results of distribution system model with results of matrix convergence defined.

Keywords
Modeling, distribution systems, transportation of freights, gravity algorithms, single constraints

Topic
Computer Science

Link: https://ifory.id/abstract/p4T2tX7PCrhc

Corresponding Author
Tugiyo Aminoto

Institutions
Physics Education Department of Jambi University
*) tugiyo[at]unja.ac.id

Abstract
Teaching and learning which mainly based on conventional media, offers limited resources in exploring a comprehensive concept of statistical physics phenomena. As a consequence, it needs to incorporate a computer simulation whose has superiority in visualizing a wide range of complicated and abstract physics concepts. This study aims to develop a computer simulation of gas speed measurement as a learning medium on the subject of Maxwell distribution. Measurement of very small and un-naked eye gas particles requires special techniques and tools that involve a complicated process of selecting particles and measuring their speed. For learning purposes, this measurement process needs to be done with computer simulation. This research uses the ADDIE model which includes analysis, design, development, implementation and evaluation. The results of the simulation show conformity with Maxwell-s speed distribution graph which was obtained theoretically and can enhance the quality of teaching of this subject.

Keywords
learning media, computer simulation, gas velocity measurement

Topic
Physics Education

Link: https://ifory.id/abstract/gQFDrEu76KVA

Corresponding Author
Ferra Yanuar

Institutions
Andalas University

Abstract
Structural Equation Modeling (SEM) is a statistical technique that is able to analyze relationships between latent variable and its measured variables and amongs latent variables. The purposes of this present study are to construct political participation model in Padang, West Sumatera using SEM approach then implement the reliability tests to the proposed model. The political participation model in this study uses a multidimensional construct, such as Political awareness, political knowledge and political participation. Meanwhile each construct is measured by two and more measured variables. The multidimensional construct reliability in this study was estimated by using Coefficient of Reliability (CR), Coefficient of Reliability Composite Score McDonald-s ω, and Coefficient of Reliability Construct Weighted Ω_ω. Simulation study is done for several size samples and this study yield that all three indicator of reliability tests resulted similar values. This resulted informs that any constructs in proposed model of political participation is reliable and the coresponding proposed model could be accepted.

Keywords
Multidimensional construct, political participation, reliability tests, Structural Equation Modeling (SEM)

Topic
Mathematics

Link: https://ifory.id/abstract/tKgBWxL6wubA

Corresponding Author
Siti Maimunah

Institutions
UPI

Abstract
vation categories, this research conducted 4 test( 3 Mathematical Abstraction test 1 Olympiad test) and 1 questionnaire on self confidence. The result showed that Mathematical abstraction tests make them aware of their own understanding state. It also gives them knowledge they can use to complete mathematics Olympiad test. Further explanation on how their opinion and self confidence changes after the whole test is revealed on the results. In conclusions, this research explain how self confidence is the first weapon students need to have to conquer any challenges including mathematics Olympiad.

Keywords
Mathematical Abstraction, Self Confidence, Mathematics Olympiad

Topic
Mathematics Education

Link: https://ifory.id/abstract/KNZx4tkGBc7F

Corresponding Author
Puspita Nurul Sabrina

Institutions
Universitas Jenderal Achmad Yani

Abstract
Supply Chain Management (SCM) can be seen from the upstream, midstream and downstream supply chains. Efficiency can be increased by business strategies in all three sections. The fashion industry such as garment and textile is a very dynamic industry where fashion trends change rapidly in a short time. How can produce products that can adjust to consumer trends or needs become a strategy in increasing the efficiency of SCM. SCM downstream side needs, namely customers must be analyzed by analyzing customer experience such as social influence and analysis to avoid running out of stock, the two things are analyzed with certain attributes. Consumer needs can be explored based on customer purchase history and the phenomenon of current fashion trends. Online marketing, e-commerce, social media as trading media can provide knowledge. Methods related to data analysis such as big data analysis and social trends continue to develop. In this study, the concept of analytic data will be proposed by applying various factors such as social factors, social influences, business, trade, purchase history, collaborated with various techniques with the aim of knowing the needs of people in the fashion world. What data is relevant will be analyzed and processed by relevant methods with the result tendency community on certain fashion. This research will produce an analytical data model of social influence that focuses on the domain of the fashion world which is the input and recommendation for the downstream part of the Supply Chain Management System in order to increase the efficiency and effectiveness of SCM.

Keywords
data analytic; social informatic; SCM; fashion industry;

Topic
Computer Science

Link: https://ifory.id/abstract/2xVpqXa4hfzE

Corresponding Author
Renita Novitasari

Institutions
Universitas Pendidikan Indonesia

Abstract
The research is the first research that opens up our Universe from a mobile application called Solar Walk Ads+: Explore Space to improve students- understanding and believe in learning Solar System. Assisting the students in understanding the situation of the Solar System to make the abstract fact clearer and increase the students- believe in performing task. The work has begun to collect the data of students- post-test and pre-test using quasi-experiment design participated by 12 students in 7th grade of a private school in Bandung, West Java. After the data was collected by the implementation of Solar Walk Ads+: Explore Space application with the instruments such as observation sheets, worksheets, questionnaire, and objective test, the data analysed based on three different concepts, the higher improvement shows in the concept of the Solar System-s effect on the phenomenon on the Earth. Meanwhile, the students- believe effect after learning with this application resulted in the better improvement shown for the lower achiever students rather than the higher achiever students. Finally, this research recommends to held research that finds out whether the improvement is better if learning Solar System using Solar Walk Ads +: Explore Space also motivates students to learn.

Keywords
Solar Walk Ads+ , Interactive Media, Students- understanding, Students- believe, Solar System

Topic
Integrated Science Education

Link: https://ifory.id/abstract/TyfPwedmM9av

Corresponding Author
RESY NIRAWATI

Institutions
1,2,3Departemen Pendidikan Matematika, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229, Bandung 40154, IndonesiaAffiliation, 1STKIP Singkawang, Jl. STKIP Kelurahan Naram Singkawang, Kalimantan Barat 79251, Indonesia

Abstract
This study aims to analyze the ability of spatial representation in solving space geometry in terms of brunner-s theory.. Research result of the spatial represetation ability namely 1) students sketch the picture and illustrate the problem presented; 2) students work on the question given with complete stages (processes) by using the right concept (presenting conceptual concepts formed from old concepts) and 3) students explain the concept process that is done by using their own language. While based on brunner-s stages in the enactive phase, students manipulate objects observed to find certain pattern, concepts or principles. For the iconic stages students visualize geometric objcts in a sketch or picture. Furthermore for the symbolic phase students recontruct concepts thet have been visualize to be described with words or sentences and express them in the form of a formula.

Keywords
Spatial representation, Geometry, Brunner-s theory

Topic
Mathematics Education

Link: https://ifory.id/abstract/RCZAJQFgp4GT

Corresponding Author
I Dewa Ketut Sastrawidana

Institutions
Undiksha

Abstract
The use of agrochemical such as fertilizers and pesticides intensively on agriculture sector contributes to the increase of heavy metals residual in soil and vegetables. Lead (Pb) and Cadmium (Cd) are two types of heavy metal considered toxic, carcinogenic for living organism and persistence in environment. Pb and Cd metals are frequently found as impurities in fertilizer products. Our researches focused on the speciation of Pb and Cd heavy metals on soil which cultivated vegetables. In addition, soil characteristic (organic matter content, pH and cation exchange capacity) as a factor influencing heavy metal speciation and bioavailability for plants also analyzed. Beside that, measurement of Pb and Cd content on several types of vegetables such as tomatoes, cabbage and carrots are conducted then used to determine the level of safety for consumed. Heavy metals speciation carried out using sequential extraction method then the Pb and Cd content on each fraction was analyzed by atomic absorption spectrophotometer. Heavy metal of Pb in various fraction are in the following order F3> F1> F5 > F4>F2 whereas heavy metal of Cd order F4> F1>F3>F5>F2. The organic matter, pH and cation exchange capacity on sample soil was 3.05% ; 5.56 and 20.30 mek/100 g, respectively. The health risk values of daily intake of metal (DIM) and health risk index (HRI)<1 indicates that the vegetables was relatively safety for consumed.

Keywords
Cadmium, lead, farmland, fertilizer, health risk index, heavy metals speciation.

Topic
Chemistry

Link: https://ifory.id/abstract/MXDL9UY6r2eV

Corresponding Author
Iryanto Iryanto

Institutions
1 Informatics Department, Politeknik Negeri Indramayu, Indonesia.
2 Industrial and Financial Mathematics Research Group, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Indonesia.

Abstract
In this research, we develop mathematical model to investigate the effectiveness of embankment and vegetation on the reduction of wave run-up. We solve the model numerically using a staggered finite volume method. Wave run-up test on a sloping beach is conducted to show the accuracy of our numerical scheme. In this case, we compare our numerical results with results of laboratory experiment of Synolakis in 1987. Further, sensitivity analysis is presented to see the effect of the characteristic of the structures.

Keywords
Wave run up, staggered finite volume, overtopping, wave mitigation

Topic
Mathematics

Link: https://ifory.id/abstract/QzpqjMnLNJZ8