Indonesia Conference Directory

Corresponding Author
Eka Cahya Prima

Institutions
Universitas Pendidikan Indonesia

Abstract
The uses of technology commonly exist and essential to nowadays live. Mobile learning is one of the learnings tools that is easily used in this era. The aim of mobile devices nowadays are improved, its function is enlarged because the mobile devices can be used anywhere and anytime to connect the information, processes, and communications. Students consider that the function of using mobile to their learning is more productive. Physics is one of study that students often confused and mistakenly judged as a difficult subject to be learned. The advanced technology used in teaching and learning intended the researcher to build a mobile learning application especially in physics materials that relate with the used of Arduino UNO in form of technology. Generally, the process of developing the mobile learning application consist of several steps: (1) the content analysis; (2) the material source analysis; (3) the user analysis; (4) the software necessity analysis; (5) the hardware necessity analysis; (6) the design stage of mobile learning application making which consists of learning materials, flowchart, storyboard, interface making and coding. The method that used in this research was descriptive. The participants were 22 students of private Junior High School in Bogor and 3 science teachers from each respectively Junior High School in Bandung and Bogor. The experts in content, language, and media are evaluated by the mobile learning application. The results show that the overall of mobile learning application based on Arduino UNO is adequately received a good evaluation from each aspect. The students and science teachers are greatly welcomed for its implementation.

Keywords
Mobile Learning, Android Application, Arduino UNO Projects, Students- Impression, Science Teachers- Responses

Topic
Integrated Science Education

Link: https://ifory.id/abstract/pP3XybEC9qGd

Corresponding Author
Jajam Haerul Jaman

Institutions
1. Singaperbangsa Karawang University
2. Computer Science Faculty

Abstract
Begin, children are often presented with a cartoon or animation 2 that is not appropriate to the age, many other elements in the childs watch such as violent elements, filthy elements and others that make a change in behavior Children because of the growing age, the development of child behavior is still growing based on the experience that children see from the current spectacle. Lack of parental supervision in sorting child views makes children free to watch what content they see. The use of 2-dimensional animation technology and interactive learning media aims to attract students as a learning behavior as well as entertainment to be attracted by children. Methodology used in this study is Multimedia Development Life Cycle (MDLC) with tools used in building applications such as Adobe Illustrator CC 2017, Adobe After Effect CC 2017, and Visual Novel Maker. The app successfully features 2-dimensional animations and interactive learning inside. The applications test implementation uses a paired sample test-T which generates a significant percentage rate of t count = 10.23 > t table value = (? = 0.05, df = 29) = 1.699 so that Ho is in the rejection area and H1 is accepted. Then there is a difference between before and after using the application, it can be said that the application can increase the understanding of students by shown the sample data x ?1 = 66.3 x ?2 = 82.3. As well as the result of a questionnaire to 30 students using the rating scale get results 82,3% of students choose very agreed, so it can be concluded that the application deserves to be used as a media Learning ordinance behave well.

Keywords
Multimedia; Interactive; 2D; animation; Education

Topic
Computer Science Education

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

Corresponding Author
Garno Garno

Institutions
(a)Program Studi Teknik Informatika, Fakultas Ilmu Komputer, Universitas Singaperbangsa Karawang
*purwantoro.masbro[at]staff.unsika.ac.id, garno[at]staff.unsika.ac.id, 1441177004113[at]student.unsika.ac.id
(b)Departement of Computer Science Education, Universitas Pendidikan Indonesia
munir[at]upi.edu

Abstract
The study was conducted in the field of hiding messages using the media image. This model is often referred to as steganography technique. Image media used for insertion are BMP (Bitmap Picture) format images, JPEG (Joint Photographic Expert Group) and PNG (Portable Network Graphics). The secret message form that is inserted is in the txt format. The application used for insertion is the Digital Invisible Ink Toolkit. Research parameters include image quality testing, and quantitative testing on each Blindhide algorithm and the Filterfirst algorithm. Image Quality test results using MSE, PSNR, showed significant differences, while the value of SC showed differences but not substantial. The results of testing and analysis evaluations that have been carried out on each image turned out to be an average value of the MSE value of the Blindhide algorithm 0.024 greater than the Filterfirst algorithm 0.023, PSNR Blindhide algorithm 31.91 smaller than the Filterfirst 32.03 algorithm, SC Blindhide algorithm 0.99986 smaller than the Filterfirst algorithm 0.99988. This shows that the insertion of a secret message into the image using the Filterfirst algorithm is safer and will not be suspected.

Keywords
Steganography, Embedding, Blindhide, Filterfirst, Digital Invisible Ink Toolkit

Topic
Computer Science

Link: https://ifory.id/abstract/2Kpf3Q6quMC7

Corresponding Author
Ikmanda Nugraha

Institutions
International Program on Science Education, Faculty of Mathematics and Science Education, Universitas Pendidikan Indonesia
Jl. Dr. Setaibudhi No. 229 Bandung 40154
*ikmandanugraha[at]upi.edu

Abstract
Comic strips and videos are two popular media used in today science education. The objectives of this study were to examine the learning outcomes and to explore the contributing factors that drive students to achieve the learning outcomes. A quasi-experimental design was employed. The participants were university students in the science education major from batch 2015 and 2016. Batch 2015 was assigned as endoscopic video class while batch 2016 was assigned as comic strips class. The results showed that there was no significant difference in students learning outcomes and its highest contributing factor for the learning outcomes was personal motivation followed by the lecturer and the media. We conclude that both media were able to facilitate students learning outcomes but motivating students personal motive was also essential due to the nature of university student as the independent learner.

Keywords
learning digestion process; comic strips; endoscopic video

Topic
Biology Education

Link: https://ifory.id/abstract/6ayCuUnNp2TW

Corresponding Author
Munir Munir

Institutions
Departement of Computer Science Education
Universitas Pendidikan Indonesia
Jln. Dr SetiabudhiNo.229 Bandung 40154 INDONESIA

Abstract
The background of this research is due to problems in learning computer systems at school. The purpose is to find out the improvement of students cognitive aspects by applying a cooperative script method assisted by interactive multimedia on the subject of computer system. The method used is an experimental method with a quasi-experimental form. The research design used is a nonequivalent control group design. Before conducting the research, the multimedia was validated first by the expert of material and the expert of multimedia. Based on the data processing, the result are 1) the improvement of cognitive aspect in a control class has a gain index 0.37, while in the experiment class is 0.78. 2) The multimedia has a good response from the students and reached the percentage of 78.51%.

Keywords
Cooperative Script, cognitive aspects, interactive multimedia

Topic
Computer Science Education

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

Corresponding Author
Rina Marina Masri

Institutions
Universitas Pendidikan Indonesia

Abstract
Abstract. The purpose of research were: (1) designing digital data base management system for housing land suitability evaluation, (2) creating geographic information system based logic scoring of preference method for housing land suitability evaluation, (3) producing the housing zone of land suitability evaluation. Karawang district was research location. The research was conducted on January 2019 to July 2019. The research is using descriptive method. The research population is physical, social-economic and environmental conditions. The sampling technique is purposive. Research instruments are measurement and mapping tools, questionnaires, observations, computer hardware and software. Primary data taken by physical, chemical and biological environment and social-economic. Secondary data taken are maps of soil texture, soil drainage, soil type, erosion, slope, effective depth of soil and flooding. Spatial analysis is used to superimpose layers, using GIS software. Thematic map which was producing the housing zone of land suitability evaluation from GIS software, satellite imagery from internet could be more accurate and effective than conventional and analog method.

Keywords
GIS, logic scoring of preference, land suitability evaluation, housing

Topic
Computer Science

Link: https://ifory.id/abstract/fbZun8APJK9C

Corresponding Author
kartika yulianti

Institutions
Universitas Pendidikan Indonesia

Abstract
In this paper, we present a simple modified Lax-Friedrich method for the numerical solution of shallow water equations. In the proposed method, we approximate the next-step value by applying the Lax–Friedrichs method at the half grid of space. The method were applied to simulate the wave propagation at a rest pool for non-flat topography. Based on the simulation, the proposed method is more accurate in terms of fulfill the conservation law than the classical Lax-Friedrichs method and it shows good agreement with steady analytical solution.

Keywords
Shallow water equations, Lax-Friedrichs method, Modification

Topic
Mathematics

Link: https://ifory.id/abstract/VXDv3yrZ4Wc9

Corresponding Author
Lia Ardiansari

Institutions
UPI

Abstract
Relational thinking involves understanding equality and numerical relationships, thus encouraging students to reflect on the numerical relationship between structurally similar expressions promising a smooth transition from arithmetic to algebra. The distributive property provides a means of the equal sign to connect two operations, such as addition and multiplication in any field. Therefore, the distributive property is used in this study to investigate the type of familiarity with the nature of this operation so that it can be a promotion of flexibility in thinking that can lead to algebraic thinking. This study aims to investigate ways of thinking, learning, and experiences that are understood narratively. A Narrative inquiry highlights the problem and forms a new theoretical understanding of ones experience. Data was collected by distributing questionnaires and semi-structured interviews to participants as many as 53 junior high school students where 45% were male students and 55% were female students selected using purposive sampling technique. The results of the study show that generally junior high school students still have a weak understanding of the same relationship in distributive property described by the word "operational" which is a contrasting understanding with the relational viewpoint.

Keywords
algebraic thinking, distributive property, equal sign, narrative inquiry, relational thinking

Topic
Mathematics Education

Link: https://ifory.id/abstract/njJ2ZR4BAGMX

Corresponding Author
Al Azhary Masta

Institutions
1Department of Mathematics Education, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi 229, Bandung 40154, INDONESIA

2Department of Mathematics Education, STKIP Muhammadiyah, Jl. KH. Ahmad Dahlan 51, Kabupaten Bangka Tengah, Bangka Belitung, 33684, INDONESIA

Abstract
In this paper we present sufficient and necessary conditions for generalized Ho ̈lder-s inequality in p summable sequence spaces which complete the Masta, et al. result in 2018. One of the keys to prove our results is to use the norm of the characteristic sequence of the balls in Z^n.

Keywords
Holders inequality, sufficient and necessary conditions, p-summable sequence spaces

Topic
Mathematics

Link: https://ifory.id/abstract/q3GMHPFWLKtz

Corresponding Author
Ridwan Fadjar Septian

Institutions
a) Master of Information System, Faculty of Postgraduate, Universitas Komputer Indonesia, Indonesia
*ridwanbejo[at]gmail.com
b) Senior Software Engineer, Horangi Cyber Security, Indonesia
c) Senior System Engineer, Tado.live, Indonesia

Abstract
Big data is related to vast amount of data that could reach more than Gigabytes until Exabyte of data. Nowadays, there are many companies that already achieves exponential data growth that produced by their applications system. The technologies to maintain those dataset is not limited to single instance of database. Majority of those company have been used various tools that could help to maintain their big data system. This paper will be composed by conducting a document review and collect papers that related to big data solution and infrastructure. Afterwards, this paper might be a foundation to conduct another research for big data solution topic. The survey are trying to cover the phases for building a common big data pipelines by following these structures: enterprise vision and mission that affect the big data architecture, defining the data sources that become a center point of the business, building the backend services to collect the datapoint from the data sources, utilize the data pipeline to prevent data loss, consuming the data pipeline message and deliver it to the data storage, build the raw data storage, define business-driven data visualization and analytics, build the ETL (extract, transform, load), build business-oriented data storage, applying statistical and machine learning, perform the business-driven visualization and implementing the monitoring for the big data pipelines. By the end of the study review, The survey will emphasize that there are many big data component that could help the small-medium enterprise to tackle their big data operational issues. And the small-medium enterprise could gain a knowledge to utilize some products from open source and proprietary to help manage their large-scale dataset as a comprehensive pipeline.

Keywords
big data architecture, data engineering, message queue, message streaming, datalake, data warehouse, data visualization

Topic
Computer Science

Link: https://ifory.id/abstract/RA9qWN8j7Fue

Corresponding Author
Al Azhary Masta

Institutions
1Department of Mathematics Education, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi 229, Bandung 40154, INDONESIA

2Analysis and Geometry Research Group, Bandung Institute of Technology, Bandung, INDONESIA

3Department of Mathematics Education, STKIP Muhammadiyah, Jl. KH. Ahmad Dahlan 51, Kabupaten Bangka Tengah, Bangka Belitung, 33684, INDONESIA

Abstract
In this paper we present a sufficient condition for generalized Ho ̈lder-s inequality in Orlicz sequence spaces. One of the keys to prove our results is to use the norm of the characteristic sequence of the balls in R^n.

Keywords
Ho ̈lders inequality, sufficient and necessary conditions, p-summable sequence spaces

Topic
Mathematics

Link: https://ifory.id/abstract/tQ8f3c64eFhd

Corresponding Author
Dadang Juandi

Institutions
Universitas Pendidikan Indonesia

Abstract
The purpose of this study is to improve the achievement of in-service mathematics teachers in pedagogical and professional competences through professional development program by using a Cycle Pedagogical Problem-based learning. The research subjects consisted of 58 in-service mathematics teachers from a number of senior high schools from five districts in West Java. The research instrument consisted of observation guidelines, interview guidelines, teacher competency tests, and self-efficacy scale. Mathematical pedagogical problems presented to trainees in a number of cycles, which include some mathematical material that is relevant to the 2013 curriculum. The results of data analysis show that overall the achievement of pedagogical competency is better than the achievement of professional competency. Pedagogical competency is achieved in the high category, and professional competency is achieved in the medium category. The achievement of self-efficacy found that the majority of teacher candidate is in the positive category. Judging from the differences in region of origin it was found that there were no significant differences in pedagogical competency nor professional competency.

Keywords
Pedagogical Competency, Professional Competency, Pedagogical- Problem Solving Cycle, Self-efficacy.

Topic
Mathematics Education

Link: https://ifory.id/abstract/gQN3MuZG9C4H

Corresponding Author
Eddy Prasetyo Nugroho

Institutions
Departement of Computer Science Education
Universitas Pendidikan Indonesia

Abstract
This research aims to design and build interactive multimedia game based on TANDUR strategy to improve SMK sudents- concept understanding in Basic Programming subject. Quantum teaching learning model TANDUR strategy means Tumbuhkan (Grow), Alami (Experience), Namai (Name), Demonstrasi (Demonstration), Ulangi (Repeat), and Rayakan (Celebrate). Researc data gathered from field survey quastionnaire and interviewing RPL subject teacher in one SMK in Bandung. Reserch results are: 1) interactive multimedia game has been developed and rated good so that it is worth applying with percentage of 80% from media expert and 83% from content expert and 76% from students- assessment. 2) interactive multimedia game improves students- concept understanding by gain index, before using interactive multimedia game average score for over achiever or upper group was 60 after using interctive multimedia game 86.3, average or middle group from 36 to 72.9, and under avhiever or lower group from 35.4 to 61.

Keywords
Multimedia, Game, Quantum Teaching Learning Model, TANDUR Strategy, Concept Understanding

Topic
Computer Science Education

Link: https://ifory.id/abstract/fxDXj3mPyeLr

Corresponding Author
Siti Oryza Sativa

Institutions
Laboratory of Analytical Chemistry, Department of Chemistry, Bandung Institute of Technology, Bandung 40132, Indonesia1, Analytical Chemistry Research Division, Bandung Institute of Technology, Bandung 40132, Indonesia2, Department of Chemistry, Science and Technology Faculty, UIN Walisongo, Semarang3, Research Unit for Clean Technology Indonesian Institute of Science, Jl. Cisitu Sangkuriang, Bandung 40135, Indonesia4Technology, Bandung 40132, Indonesia
zulfikarmuhammadali[at]gmail.com

Abstract
Peat water source could be found in many lowland and marshy areas in Indonesia such as in Sumatra, Kalimantan, and Papua. This type of water could be a problem for resident living around it as fresh water is one of the basic needs for human being. It formed from decayed of plants, animals, and microbes. The main component of peat water is humic acid which is a complex of organic compound and natural polymer. One of the potential process to treat humic acid is by using photocatalytic degradation method. This research aims to conduct activity of PVDF-TiO2/ZnO/CoO nanofiber photocatalyst for degradation of humic acid solution. Photocatalytic activities was studied inside photoreactor with artificial UV radiation with 254 nm wavelength. The percentage of degradation was determined by measuring humic acid solution before and after degradation using UV-Vis spectrophotometer with maximum lambda in 219 nm. Study of kinetic for photocatalytic reaction was calculated with rate constant 4,29 x 10-5 min-1 ppm-1 and the kinetic of photodegradation on this research was pseudo second order kinetic model.

Keywords
nanofiber, photocatalyst, photocatalytic activity, TiO2, humic acid

Topic
Chemistry

Link: https://ifory.id/abstract/eB3YnER4VxPc

Corresponding Author
Galuh Yuliani

Institutions
Chemistry Department, Universitas Pendidikan Indonesia, Jalan Dr. Setiabudi 229 Bandung 40154, West Java, Indonesia

Abstract
Coal bottom ash (CBA) waste generated from coal-based industries has been increasing at an alarming rate causing huge problems in its recycling and disposal process. On the other hand, CBA is potentially used as raw material in zeolite manufactures due to its high SiO2 and Al2O3 contents. We report the conversion of CBA into zeolites-like material via a low temperature method of 90°C for 24 h using NaOH solution. The synthetic zeolite was characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), X-ray fluorescence (XRF), scanning electron microscopy (SEM), and BET surface area measurement. The study of its adsorption-desorption properties was also conducted using ammonium solution. FTIR spectra confirmed characteristic zeolite peaks at 980-1170 cm-1, 740.6 cm-1, 439.7 cm-1, 559.3 cm-1 for Si-O, Al-O and Si-O-Al absorptions, respectively. XRD results indicated the formation of sodium aluminosilicate hidrate belong to the zeolite structure group at NaOH 5M ratio of 1:8. XRF results also indicated the domination of Al2O3 and SiO2 in the zeolite composition. BET analysis resulted the surface area of zeolite was 60.38 m2/g, markedly increased from the initial surface area of CBA of 0.598 m2/g. The maximum adsorption capacity for ammonium ions were 85.22 mg/g and the adsorption data fitted the Freundlich isotherm model. Meanwhile, the desorption study indicated that the ammonium leached rapidly in the first 3 h followed by a plateu in the next 71 h.

Keywords
bottom ash; zeolite; adsorption; desorption; ammonium

Topic
Chemistry

Link: https://ifory.id/abstract/7vdQM4wzPbxg

Corresponding Author
rozikin chaerur

Institutions
a) Lecturer of Informatics Engineering, Faculty of Computer Science, University of Singaperbangsa Karawang

Abstract
With many of salespersons offering houses, it will be an advantage and it will make the houses will be sold faster. During this time the coordination between salespersons only using WhatsApp. The coordination is needed for mapping and recording of booked houses and has not been booked by the buyers manually and the data will be saved in the marketing center office. Problem will be shown up when there are two or more buyers booked the same block and number of a house and they paid the booking fee and each of those buyers coordinated with different salespersons, and the claims of who booked the house first will come up as the result. To solve that problem, an android-based on House sales Monitoring System needed to be developed. The Android-based application will be developed in this research aims to help the monitoring of house sales and provides the information of booked houses, has not been booked, and provides buyers data. Software development Life Cycle (SDLC) will be used as a system development Methods with Prototyping model with Communication, Quick Plan, Modeling Quick Design, Construction of Prototyping, dan Development Delivery and Feedback steps. The result of this research is an application software helping sales and marketing in monitoring the house sales. Based on interview with salespersons as much as 96% said that the application interface is easy to use and can help them in the process of the house sales monitoring. And based on the WhiteBox testing, there are no logic error in the application and it run well.

Keywords
Marketing Staff, Houses, Application, Android, monitoring

Topic
Computer Science

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

Corresponding Author
Erna Piantari

Institutions
Departemen Pendidikan Ilmu Komputer, Universitas Pendidikan Indonesia - Indonesia
Teknik Informatika, Universitas Jenderal Achmad Yani - Indonesia
University of the Cumberlands, Kentucy - USA

Abstract
Nowadays the development of information technology has driven the development of e-commerce which is quite promising in Indonesia. This development has brought an era of new digital-based creative developments. Agriculture as one of the economic and community welfare bases in Indonesia needs to be developed and supported with information technology. One of the technologies commonly used in sales and marketing is the marketplace. This study aims to create a marketplace architecture model that is in accordance with the characteristics of business actors in agribusiness. The marketplace architecture is built based on the architecture of the Next Generation E-Commerce Platform and Agriculture Supply Chain Management.

Keywords
marketplace, agribusiness e-commerce, e-commerce, Agriculture SCM

Topic
Computer Science

Link: https://ifory.id/abstract/7MeKNnTFq2yt

Corresponding Author
Lala Septem Riza

Institutions
Universitas Pendidikan Indonesia, Bandung, Indonesia
School of Engineering and Science, Tecnologico de Monterrey, Monterrey, Mexico

Abstract
Batik is a fabric made with anti-wax dyeing techniques and is one of the many cultural heritage of Indonesia that has high artistic value and has become the hallmark of a nation that must be preserved. One way to preserve it, is to introduce batik. In order to make it more attractive, we can use multimedia as media to introduce batik. Augmented reality (AR) is a technology that adds virtual objects into the real world. This technology could provide a new way of delivering information to users, which is more interactive. So, it is expected to increase the sense of desire to know batik and its local wisdom. In this research, a system of marker-based tracking AR used to introduce batik and its local wisdom (called batikAR) was made. One type of AR is marker-based tracking methods. These methods use a marker as a reference display objects/ information. To track markers, there are several steps that must be performed on every frame received from the camera android smartphone. The phase of tracking in this study includes: conversion of images from the camera frame into a grayscale image, thresholding, the contour detection, perspective transformations, and finally decoding using the Hamming Code algorithm. According to the experimentations that were conducted, user responses to the application batikAR are good enough. Moreover, tracking markers on this system could properly track 100% of each marker in normal circumstances, within a certain range depending on the size of the marker and at an angle of 450. However it is unaffected by ambient light conditions. Therefore, we can state that the system can be used as an alternative teaching methods for introducing batik and its local wisdom.

Keywords
Image processing, Augmented reality, Local Wisdom, Learning media

Topic
Computer Science Education

Link: https://ifory.id/abstract/Gwf7FmVupzxY

Corresponding Author
Neneng Sri Wulan

Institutions
Universitas Pendidikan Indonesia

Abstract
This study is motivated by the importance of early childhood reading readiness as a first step to enter the beginning of reading stages. An ICT-based educational game containing an Indonesia folktale has been choosen to develop the early childhood reading readiness. The study is a descriptive research. The purpose of the study is to produce an educational game for early childhood reading readiness. The result of the study is the availability of an android-based folktale application to stimulate visual and auditory perception for early childhood reading readiness, which is developed using Eclips, Construct, and Photoshop program. This app can be run on android Kitkat OS, 1 GB memory, 480x800 screen. To develop this android app, there are several steps to be taken, including program design, scenario design, and program development. This app consists of Main Menu, About Me, Jungle Adventure, River Adventure, House Adventure, and Play in the Park. This app is interactive so the users can play it by themselves and choose the menus as they wish.

Keywords
android app, folktale, reading readiness, early childhood

Topic
Integrated Science Education

Link: https://ifory.id/abstract/CGnUF6Px473M

Corresponding Author
Rana Zaini Fathiyana

Institutions
a) School of Energy, Bandung Institute of Technology
Jalan Ganesha 10, Bandung 40132, Indonesia
b) School of Energy, Bandung Institute of Technology
Jalan Ganesha 10, Bandung 40132, Indonesia

Abstract
The lack of coordination in the integration of information systems between government agencies that issue identity numbers causes replication and redundancy of population information data. Another problem is the emergence of citizens concerns over data integrity and security due to national identification records is also used by the private sector. In this paper, one of the solutions offered to overcome the above problem is to build an integrated national identification database system between government agencies by applying the concept of Single Identity Number (SIN) using blockchain technology. Blockchain is a secure and robust system for keeping a record of the identities of all citizens and also able to facilitate data integration between institutions. This paper uses the strengths of blockchain to possess characteristics of immutability that it is possible to store national identification records. The available attributes of the national identification records can be used effectively in applications such as health care records, passport issuance, banking, etc.

Keywords
National identity; Single identity, Blockchain

Topic
Computer Science

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

Corresponding Author
Taufik Ridwan

Institutions
Study Program of System and Information Technology Universitas Pendidikan Indonesia,
Study Program of Elementary School Teacher Training Universitas Pendidikan Indonesia

Abstract
Development and growth in children have to be stimulated properly in order to occur optimally. One aspect that must be considered is the cognitive aspect. In the growth and development phase, children spend most of their time to play. Generally, Children have the high ability to learn and curiosity. They tend to like games that attract attention to be played. At his age, children can-t be separated from objects in their environment, including objects in geometric shapes such as balls, cupboards, beams, tubes, coins, cubes, tubes, cabinets, and many more in play. Learning to recognize geometric shapes helps children to understand, describe, and describe objects that are around them. Therefore, at this time children need to get interesting positive stimulus to hone their intelligence. Now, many childrem can-t be separated form gadgets. Many of them become addicted to gadget and games. This paper tries to analyze and design a prototype of Digital Edu Games for children that can be used to help learn geometry based on specific problem solving approaches. Children will learn geometry through pairing and adjusting pictures accordingly, arranging drawings, and building a geometric shape. The method used in this study is Research and Development (R&D) with a waterfall approach in software development. The objectives of this study are: (1) analyzing the needs of games for learning geometry for children; (2) designing N-Ram for children. This research has benefits in developing learning media through Digital Edu Games combined with games in the form of games on gadgets.

Keywords
digital games, learning media, geometry, children

Topic
Computer Science

Link: https://ifory.id/abstract/ajNAMc9zUk6n

Corresponding Author
Tia Purniati

Institutions
1Departemen Pendidikan Matematika, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229, Bandung 40154, Indonesia

2SMP Laboratorium Percontohan UPI, Jl. Dr. Setiabudi No. 229, Bandung 40154, Indonesia

3Program Studi Matematika, UNISBA, Jl. Tamansari No. 1, Bandung

Abstract
This study aims to analyze the instruments and abilities of students on material number patterns using the Rasch model. The instrument analyzed was in the form of essays and consisted of eight questions. The instrument was tested on 29 8th grade junior high school students consisting of 15 female students and 14 male students. Instrument analysis and student ability using the Rasch model based on instrument difficulty (item measure), student ability level (person measure), Wright map (person-item map), and instrument analysis. The results showed that there was one difficult question, six medium questions, and one easy question. In addition, there were five students with high abilities, sixteen students with medium abilities, and eight students with low abilities. The level of difficulty of the diversity instruments is not far adrift, but the level of student ability varies. The average level of student ability is above the average level of difficulty of the Instrument. The interaction between students and instruments as a whole is bad. The consistency of answers from students is weak, but the quality of the instrument is sufficient

Keywords
number patterns, Rasch model

Topic
Mathematics Education

Link: https://ifory.id/abstract/ZcQ3rYXawD78

Corresponding Author
Sinta Widya Ningtias

Institutions
a) Magister of Mathematics Education, University of Lampung. Jl. Prof. Dr. Sumantri Brojonegoro. No. 1, Bandar Lampung, Indonesia 35141.
*sintawidya.ningtias7[at]gmail.com
b) Department of Mathematics and Science Education, University of Lampung, Jl. Prof. Dr. Sumantri Brojonegoro. No. 1, Bandar Lampung, Indonesia 35141.

Abstract
This study aims to determine students mathematical communication skills in statistical material. The subjects in this study is the VIII grade students selected by purposive sampling. The method used in this research is descriptive. Data obtained from the communication skills tests of mathematical students consisting of three essay contain of three indicator the mathematical communication ability, namely, drawing (expressing their ideas in the form of pictures, graphs and diagrams), written text (giving the mathematically explaination), and the mathematical expression (creating a mathematical model). The tests were given to 30 students of class VIII in SMP Muhammadiyah 3 Bandar Lampung. The data were analyzed quantitative and qualitative to get a comprehensive picture related to students mathematical communication skills. The results showed that the percentage of achievement of students mathematical communication indicator as follows: 1) drawing by 35%, 2) written text by 51%, and 3) the mathematical expression by 42%. Based on the percentage achieved on each indicator, it can be concluded that students mathematical communication ability is low.

Keywords
communication, communication skills

Topic
Mathematics Education

Link: https://ifory.id/abstract/ThtNMkE4ZCbx

Corresponding Author
Eyus Sudihartinih

Institutions
Universitas Pendidikan Indonesia

Abstract
This study aims to obtain a general description of the analysis of mathematical understanding of prospective mathematics teachers in the conic concept with Rasch models. This study was pre-experimental with a type of one-shot case study involving students of prospective mathematics teachers in the second semester consisting of 29 women and 10 men at one university in Indonesia. This study uses a test instrument in the form of an essay question consisting of three questions designed by a research team that is a lecturer in analytic geometry courses. The results of the analysis of mathematical understanding of prospective mathematics teachers in analytic geometry lectures with the Rasch model show that only a small proportion of students have high mathematical understanding. The results of the Rasch model measurement to examine the instruments show that the items used are not reliable and cannot be accepted to measure the mathematical understanding of prospective mathematics teachers in the conic concept. So that further research is needed on the instruments and mathematical understanding of prospective mathematics teachers in conic concept lectures with the Rasch model.

Keywords
mathematical understanding, pre-experimental, analytic geometry lectures, Rasch models, Item-Response theory

Topic
Mathematics Education

Link: https://ifory.id/abstract/zNJbQRVvAX8D

Corresponding Author
Nenden Chiarun Nisa

Institutions
a) Departement of Mathematics Education, School of Postgraduate Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No 229, Bandung 40154, Indonesia
*nchiarunnisa.upi.edu
b)Departement of Mathematics Education, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No 229, Bandung 40154, Indonesia

Abstract
Problem solving is one of the abilities that is essential in mathematics learning. Students who have the skill can solve an uncommon problem by using mathematical models and prove the exact of the results obtained. This research aims to analyze the problem solving steps of HOTS problems according to Polya which can be achieved by junior high school students. This research was designed in descriptive qualitative that involved 30 students consisting of three levels: high, medium and low level students. Data were collected by using HOTS problem test and an interview. The results showed that the high level students are capable to solve the problem but have not been able to prove the exact of the results, the medium level students are capable to reach the steps of making mathematical models, while the low level students are not capable to make mathematical models.

Keywords
problem solving, HOTS problem, Polya steps

Topic
Mathematics Education

Link: https://ifory.id/abstract/PGaf4TvACqzd

Corresponding Author
Amalia Nurfitriani

Institutions
Indonesia University of Education
Jl. Dr. Setiabudi No.229, Isola, Sukasari,Bandung 40154

Abstract
This Study has purpose of to determine the permeability characteristics and the electrical properties of the soil in guava and dragon fruit plantations. The measured land is peatland in the village of Rasau, West Kalimantan. The method for permeability (Falling Head) and electricity uses the Electrical Conductivity tool. Obtained from parameter values such as EC (Electrical Conductivity). At a depth of 350 cm -345 cm has a range of values of 0.02 ds -1 to 0.11 ds m-1, from that depth a soil permeability value of 4,198 x 10-5 cm s-1 is obtained. At a depth of 500 cm - 590 cm it has a range of values of 0.02 ds m -1 to 0.22 ds m-1 and gets a soil permeability value of 7,185 x 10-5 cm s-1. When the permeability value is small, the EC value will also be smaller so that the resulting porosity is also low.

Keywords
Permeability, conductivity, porosity, peat soil

Topic
Physics

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

Corresponding Author
Gulistan Amalia Rahman

Institutions
(a) Physics Study Program, Department of Physics Education, Faculty of Mathematics and Natural Science Education, Indonesia University of Education
Jl. Dr. Setiabudi No.229 Bandung 40154, Indonesia.
(b) Department of Soil Science, Faculty of Agriculture, Tanjungpura University.
Jl. Prof Hadari Nawawi, Pontianak 78124
*gulistanrahman[at]gmail.com
*mimin_iryanti[at]gmail.com

Abstract
Peat soils are soils that contain large amounts of organic matter. Utilization of peatlands as plantations has been carried out in West Kalimantan. One of the plants that is cultivated is Longan. Indicators that need to be known to determine the suitability of peatlands as plantations are specific gravity. Specific gravity is the ratio between the dry weight of the soil and the volume of the soil excluding the pores found between the particles. This study aims to determine the specific gravity characteristics of the longan peat estates in West Kalimantan. Measurement of specific gravity is done using ASTM D-854-02 - Pycnometer. The results obtained a specific gravity of 0.28 gcm-3 at depths of 03-350 cm and 0.38 gcm-3 at depths of 350-550 cm. The measurement results show that the specific gravity is getting bigger along with the increase in soil depth due to the reduced water content. Based on the results of research on peatlands in West Kalimantan suitable to be used as a Kelengkeng plantation land.

Keywords
Specific gravity, water content, peat soil, longan

Topic
Physics

Link: https://ifory.id/abstract/ZywVq7mPhu8b

Corresponding Author
Nonong Amalita

Institutions
Universitas Negeri Padang (UNP)

Abstract
In this paper we explain student-sperformance index on Mathematics Department UNP. Fluctuation on student-sperformance index describe the academic achievement of student. Many factors contribute to this case. Based on some research, it influenced by family environment, learning motivation, college environment, and student-s perception to the lecturer. So, we need a confirmatory analysis to test or confirm the measurement model which is build based on hypothesis used. The result is performance index of a student influenced by family environment, they are parents guidance, home atmosphere, economics factor on a family. Learning motivation factor include feeling happy on a lecture, interest to the topic, pay attention and student-s involvement to the lecture. Campus environment factor is facilities and infrastructure on university and facilities on learning room. Student-s perception factor is like and dislike factor of students to the lecturer, evaluation system chosen by lecturer, and also learning strategy of lecture.

Keywords
analysis, confirmatory, grade point average (GPA), performance, index

Topic
Mathematics Education

Link: https://ifory.id/abstract/QEKhuYjxWf9r

Corresponding Author
Cahya Furqona Alimah

Institutions
Mathematics Education, Postgraduate Program, Lampung University, Jl. Prof. Dr. Sumantri Brojonegoro No. 1, Bandar Lampung 35141, Indonesia
*cahya.furqona[at]gmail.com

Abstract
Abstract. Reflective thinking ability plays an important role in supporting mathematical problem solving skills. One topic in mathematics is sequence and series. This study aims to describe the results of the analysis of reflective thinking ability of students on topic arithmetic sequence and series, using descriptive research methods. To answer the research question, we gave a written test to 30 grade XI students in one of senior high schools in Lampung. Then, we conducted interviews with students in the upper, middle and lower groups, each with 3 students. The results showed that the average level of reflective thinking ability of students was quite adequate. The analysis of this study can be used as a consideration in developing learning designs to support students reflective thinking ability.

Keywords
Reflective Thinking

Topic
Mathematics Education

Link: https://ifory.id/abstract/E43ZRew9KyDT

Corresponding Author
Fitriani Apendi

Institutions
(a) Universitas Pendidikan Indonesia, Jalan Dr. Setiabudhi No. 229 Bandung, Jawa Barat, Indonesia 40154
(b) Department of Mathematics Education, Universitas Pendidikan Indonesia, Jalan Dr. Setiabudhi No. 229 Bandung, Jawa Barat, Indonesia 40154
(a) fitriani14[at]upi.edu
(b) sufyani[at]upi.edu

Abstract
The ability of mathematical reflective thinking must be possessed by students in Industry 4.0. This study used descriptive qualitative research that aims to determine the reflective thinking ability of senior high school students on pattern numbers. The research subjects were 10 students of class XI. Based on data analysis, it is found that: generally students could (a) check the validity of arguments based on the concepts used, (b) identify mathematical concepts used in mathematical solutions by reasons, and (c) show the difference between relevant and irrelevant data in solving the problems. Whereas only few students can (a) generalize by reasoning, and (b) solve the problems using various strategies.

Keywords
Mathematical Reflective Thinking, Patterns of Numbers

Topic
Mathematics Education

Link: https://ifory.id/abstract/9qxwT7nFGMb4