Indonesia Conference Directory

Corresponding Author
anik yuliani

Institutions
IKIP Siliwangi

Abstract
Individuals who have critical thinking ability tend to be more careful in drawing conclusions, this is because these individuals have used the process of analyzing, explaining, developing, and choosing ideas. This study aims to analyze students critical thinking ability and self-confidence in circle material. This study analyzed qualitatively with descriptive analysis method. The instruments used in this study were tests of critical thinking skills, interview guidelines and self-confidence scale. The sample of this study was class VIII students in one of the junior high schools in the city of Cimahi as many as 30 students. Based on the results of data analysis, it can be concluded that students critical thinking skills are still quite low, where some students still have difficulty in carrying out the preparation steps by choosing and determining the strategies needed to solve the problem. However, they have pretty good self-confidence.

Keywords
Critical Thinking, Self Confidence

Topic
Mathematics

Link: https://ifory.id/abstract/FzdHRMPj4qp3

Corresponding Author
Iyam maryati

Institutions
Institut Pendidikan Indonesia *1

Abstract
The purpose of this research article is to analyze the effectiveness of using the ToolPak analysis method on matrix geogebra.. The method of this study is an experimental method with quasi-experimental design. The sample in this study is students at the semester 2 of the 2017/2018 academic year at a private college in Garut district, Indonesia. The statistical test used was one sample t test. Hypothesis testing is based on test criteria if the asymp (2-tailed) value greather than alpha then null Hypothesis is accepted. from the results of data processing there is an asymp value (2-tailed) equals to 0.008 smaller than alpha equals to five percent which means null Hypothesis is not accepted. As a conclusion from this study the use of effective ToolPak analysis methods to improve students mathematical reasoning abilities in matrix algebraic material.

Keywords
Mathematical Reasoning Ability, ToolPak Analysis Methods

Topic
Mathematics

Link: https://ifory.id/abstract/AcvJhM2xequm

Corresponding Author
Rahayu Kariadinata

Institutions
1 Department Mathematics of Education, UIN Sunan Gunung Djati Bandung
1 Department Mathematics of Education, Universitas Pasundan Bandung

*rahayu.kariadinata[at]uinsgd.ac.id

Abstract
The purpose of this study was to determine the increase and achievement of mathematical spatial abilities based on high, medium, and low categories and to find out the attitudes of students towards learning through Wingeom. This research is a quasi-experimental study conducted on class IX students of one junior high school in Bandung Regency. Based on the data gain and posttest data it was stated that there were differences in the significant increase in mathematical spatial ability in both the PAM category (early mathematical knowledge/ pengetahuan awal matematika) and overall experience differences with the high mean. In general, students respond well to the use of learning media through the Wingeom application with an analysis of 2.76. Thus learning through the Wingeom application can be used as an alternative to improve the spatial abilities and mathematical dispositions of students

Keywords
Wingeom Application, Spatial Ability, Mathematical Disposition

Topic
Mathematics

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

Corresponding Author
suko wiyanto

Institutions
State Polytechnic of Malang

Abstract
The Greenhouse is currently a necessity for urban landless people. To save energy, it is necessary to install photovoltaic on the roof of a mini greenhouse to supply electricity. The use of PV is very dependent on climate, temperature and irradiation so that to obtain optimal power, MPPT is needed. In this paper present maximum power point tracking for stand-alone PV system based on PSO using input voltage and current of the boost converter. Performance of PSO is validated by Simulink with irradiance and temperature variation. Use of PSO can achieve maximum power for various irradiance. MPPT based PSO was compared by PV system without MPPT. Based on simulation result, PSO provide the power improvement 29,98 W. Simulation results show that a system designed to optimize the power produced by PV.

Keywords
Greenhouse, photovoltaic, MPPT, PSO, Boost Converter

Topic
Electrical Engineering

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

Corresponding Author
Eko Agus Suprayitno

Institutions
Eko Agus Suprayitno (a*), Mochammad Rizal Marlianto (b), Metatia Intan Mauliana (c).
(a*). Electrical Enginering Departement , Universitas Muhammadiyah Sidoarjo.
*eko.agus[at]umsida.ac.id
(b). Electrical Enginering Departement, Universitas Muhammadiyah Sidoarjo
(c).Informatics Enginering Departement, Universitas Muhammadiyah Sidoarjo

Abstract
The progress of science and technology must be able to help resolve human medical problems for human survival. In this study, an integrated measurement of oxygen saturation in the blood, heart rate and temperature of the human body has been made into one tool whose measurement results are displayed directly on the LCD display on a measuring instrument and an Android Smartphone. This tool uses Arduino Nano as its Microcontroller, Bluetooth as wireless serial communication with Android smartphone, Android Application Made with MIT App Inventor, MAX30100 sensor is used to measure blood oxygen saturation and heart rate, and MLX90614 sensor to measure body temperature. Testing Measurements that have been made are calibrated with Industrial standard measuring instruments (Oximeters) and digital thermometers. The result is that the accuracy of the tool reaches 99.62% for blood oxygen saturation measurements, 97.55% for heart rate, and 99.62% for body temperature when compared with industry standard devices. Android applications have been successfully installed on 5 types of smartphones with different brands and specifications. The Bluetooth range of a measuring device for a smartphone in maximum data transfer is 29 meters without a hitch, and a maximum of 21.5 meters with obstacles.

Keywords
MAX30100; MLX90614; arduino nano;, Bluetooth; android

Topic
Electrical Engineering

Link: https://ifory.id/abstract/2cy38mzfruQD

Corresponding Author
Moch Sukardjo

Institutions
Universitas Negeri Jakarta
Jln. Rawamangun Muka Raya, Jakarta Timur, 13220

Abstract
This research aimed to discover how the concept of measurement is applied to transistor circuits, especially bias transistor circuit, collector feedback circuit, small signal amplifier circuit and class A amplifier circuit. The methodology used was experiment by comparing the results of pre-test and post-test. Data will be analyzed using t test. Population in this study were students of the electrical engineering education study program at Engineering Faculty, Jakarta State University. The sample was randomly registered students whose electronic courses selected from 2 classes. The results showed that the master learning of students had more advanced, especially in describing and analyzing the transistor circuits calculation.

Keywords
measurement, transistor, transistor amplifier

Topic
Electronics Engineering

Link: https://ifory.id/abstract/tjphdcrF3AUu

Corresponding Author
Sri Agung Aryastuti

Institutions
a)Faculty of Medicine and Health Science, Warmadewa University, Jl. Terompong No. 24 Denpasar, Bali-Indonesia
sriagungary[at]gmail.com

Abstract
Metformin, a biguanide oral antidiabetic, is the initial treatment for patients with type 2 diabetes mellitus. Metformin is recommended either as a monotherapy or combination with the other antidiabetic agents. Some studies suggest that metformin treatments have been shown to be associated with improved the high density lipoprotein-cholesterol (HDL-C) level in type 2 diabetes mellitus by interfering with AMP-activated protein kinase (AMPK) pathway. Metformin activate AMPK that stimulates catabolic processes (glycolysis and fatty acid oxidation) and inhibits anabolic pathways (gluconeogenesis and fatty acid synthesis). This is a cross-sectional study aiming to compare HDL level in type 2 diabetic patients using metformin and non-metformin. A total of 138 patients were included in this study with mean age 59.93 (±9.49) years. In the metformin group, the median HDL-C level was 48 mg/dL, while in non-metformin group the median HDL-C level was 45 mg/dL. HDL-level in the metformin group was higher than non-metformin group but it is not statistically significant (p>0.05; Mann Whitney U test). Further studies are needed to investigate another oxidative stress parameter related to AMPK pathway.

Keywords
metformin, HDL, type 2 diabetes mellitus

Topic
Pharmacology

Link: https://ifory.id/abstract/nz6MheANy3bd

Corresponding Author
Riska Dewi Wijayanti

Institutions
a) Student of Civil Engineering Department, Institut Teknologi Sepuluh Nopember (ITS)
Sukolilo, Surabaya, 60111, Indonesia
* riska.dw[at]gmail.com
b) Civil Engineering Department, Institut Teknologi Sepuluh Nopember (ITS) Sukolilo, Surabaya, 60111, Indonesia
c) Technology Management Department, Institut Teknologi Sepuluh Nopember (ITS) Cokroaminoto 12 A, Surabaya, Indonesia

Abstract
The availability of decent drinking water is one indicator of the welfare of the Indonesian people as stated in the universal access target of 100% drinking water service in 2019. The Central Government through the Provincial Water Supply Working Unit assists with WSS Infrastructure Development Programs as a stimulant for Local Governments in meeting drinking water service targets. However, the limitations of the APBN budget have resulted in the need to prioritize the selection of the programs. The program selection method was prepared by identifying the existing conditions and evaluating the functioning of assets in each district. The priority sequence of the program was carried out by the Multi-Criteria Analysis (MCA) approach. Determination of priority criteria based on Strategic Policy for WSS Development and WSS Evaluation Guidelines. The priority sequence is the result of a calculation between the weighting of district criteria that carried out by the Provincial Working Unit, and the WSS unit by the Provincial Working Unit and district stakeholders with Borda analysis method. The application of this method resulted in a sequence of priority programs which could be a recommendation for the Provincial Water Working Unit to determine the selection of WSS Infrastructure Development Programs.

Keywords
Water Supply System; WSS infrastructure; Priority; Multi Criteria Analysis

Topic
Civil Engineering

Link: https://ifory.id/abstract/2npzJhCu7KjQ

Corresponding Author
Willy Cahya Nugraha

Institutions
(a,b) Research Unit for Clean Technology,
Indonesian Institute of Sciences
Jl. Cisitu Sangkuriang, Bandung 40135
Telp/Fax : (022) 2503051/(022) 2503240
*E-mail : will003[at]lipi.go.id

Abstract
Nitrate is one of pollutants which is found in water and dangerous for human health. Spectrophotometer UV Vis method using cadmium reduction is a simple method and cheap but it has a difficult technique and can be used for nitrate analysis. The method was validate according with analytical parameters. The result of this study were linear range 0.069- 5 mg.L- 1, limit detection and quantitation were 0.025 mg.L-1 and 0.069 mg.L-1, respectively. repeatibility of the method 2.19 % rsd and accuracy with 102.7 % recovery. All of parameters have a good performance and can be used for nitrate analysis for water sample.

Keywords
water, nitrate, spektofotometer UV Visible, validate

Topic
Chemistry

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

Corresponding Author
Esih Sukaesih

Institutions
UIN Sunan Gunung Djati Bandung

Abstract
Sarrus-s method is a rule to compute the determinant of a 3x3 matrix, by write out six entries of matrix (two columns or rows of matrix). Recently in 2014, Hajrizaj gave three new methods to compute determinant of a 3x3 matrix, by write out four entries of a 3x3 matrix. We expand the Hazrijaz-s method into fourteen method to compute determinant of a 3x3 matrix.

Keywords
matrix, determinant, Sarruss method

Topic
Mathematics

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

Corresponding Author
Indri Hapsari

Institutions
a) Doctoral Student, Faculty of Pharmacy Universitas Gadjah Mada Yogyakarta, Indonesia
*indrihapsari_ump10[at]yahoo.co.id
b) Faculty of Pharmacy, Universitas Gadjah Mada Yogyakarta, Indonesia
c) Faculty of Pharmacy, Universitas Muhammadiyah Purwokerto, Indonesia

Abstract
Ideally the compounding drug is made from pure active substances but in reality the prescribed drug as an extemporaneous compounding is in a form of factory finished drug dosage form, which should be intended for adult then formulated and adjusted to the conditions of patients. The Food Drug Administration (FDA) is aware of quality problems of drugs prescribed; one of the problems is contamination. This study aims to determine the microbial contamination in the dosage of non-sterile semi-solid extemporaneous compounding prescribed in primary health care centers. This study was an experimental observation conducted on primary health care centers by taking the prescriptions of semi-solid dosage forms used as samples. Hydrocortison and Gentamycin by microbial testing used selective media for 5 pathogenic microbes, namely Pseudomonas aeruginosa, Salmonella spp., Staphylococcus aureus, Escherichia coli and Candida albicans. Data analysis was carried out descriptively by comparing the results of the study with the requirements contained in United States Pharmacopeia (USP). Based on USP requirements, there were three semi-solid non-sterile dosage forms of extemporaneous compounding from primary health care centers A, B and D that have not meet the requirements because from the microbial test results it was found bacteria Pseudomonas aeruginosa and/or Staphylococcus aureus.

Keywords
microbial contamination, non-sterile, semi-solid, extemporaneous compounding, primary health care center

Topic
Biology

Link: https://ifory.id/abstract/CGFcBEz3uKJ8

Corresponding Author
Framesti Frisma Sriarumtias

Institutions
1Program Studi Farmasi, Fakultas MIPA Universitas Garut, Jl. Raya Samarang No. 52A Garut, Indonesia

2Lembaga Farmasi Direktorat Kesehatan Angkatan Darat, Jl. Gudang Utara No. 26 Merdeka, Sumur Bandung, Kota Bandung, Jawa Barat

Abstract
Banana skin only becomes organic waste without being able to take advantage, so the purpose of this study is to utilize kepok banana skin into microemulgel which are stable and have antioxidant activity. The skin of kepok banana was extracted using maceration method with methanol solvent. The resulting extracts were then tested for antioxidant activity with the DPPH (1,1-diphenyl-2-pikrilhidrazil) method, obtained IC50 values of 659,544 ppm. Concentration extract in microemulgel formulation is one IC50 (F1), twice IC50 (F2), three times IC50 (F3) and positive controls containing vitamin C (F4). All formulas were evaluated including organoleptic, pH, viscosity, centrifugation, dispersion, irritation test and freeze and thaw. The evaluation results show that only formula F3 changes organoleptically and decreases viscosity. The testing of antioxidant activity microemulgel containing banana skin extract showed that F2 was the best formula on pharmaceutical requirements with the the IC50 638 ppm and good stability. For all formulas after an irritation test, no erythema or udema were found, so the irritation index was zero. The benefits of this study can provide an alternative source of phytocosmetic preparations as antioxidants and utilizing organic waste into something useful.

Keywords
antioxidant, banana skin extract, dpph, microemulgel

Topic
Pharmacology

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

Corresponding Author
Riser Fahdiran

Institutions
1Department of Biology, Faculty of Mathematics and Natural Sciences., Universitas Indonesia, Kampus UI Depok, Depok 16424, Indonesia
2Biology Department, Faculty of Mathematics and Natural Sciences, Universitas Negeri Jakarta, Rawamangun, Jakarta Timur, Indonesia, 13220

Abstract
This research focused on the amount of abundance of microplastics in the sea hare Dolabella auricularia as well as the seagrass fields along the southern coast of Pramuka Island. Sampling of 8 individuals of Dolabella auricularia along with seagrass Cymodocea rotundata leafblades was done at the southern coast of Pramuka Island, after which the samples were preserved and brought to a laboratorium in Depok for microplastic analysis. The sea hares- digestive tracts were extracted and dissolved in strong nitric acid. A 1 cm2 portion of a seagrass leaf blade was cut for observation. Prepared samples were observed under a monocular microscope and further analysis was done. Microplastic fibers and film particles were found in highest abundance within the digestive tracts of each sample of Dolabella auricularia as well as on the seagrass surface where the sea hare obtains its algae from, with fragment particles found in much lower amounts. Overall, number of microplastics was found between 40.1 to 73.7 particles/g weight of sea hare digestive tract and the estimated amount of microplastic found at seagrass leafblade was 185 particles/cm2. Results provide evidence that microplastics in the ocean brought by water currents could adsorb on to algae through which it enters the food chain as it is consumed by marine biota.

Keywords
Pramuka Island, Dolabella auricularia, sea hare, Microplastic, seagrass

Topic
Biology

Link: https://ifory.id/abstract/QcWXhDbm3C9z

Corresponding Author
Erfan Handoko

Institutions
1.Dept of Physics. Universitas Negeri Jakarta. Jalan Rawamangun Muka 13220. Jakarta Indonesia
2.Dept. of Physics. Universitas Islam Negeri Syarif Hidayatullah. Jakarta, Indonesia
3.Dept. of Human Medizin, University of JLU Giessen, Germany
5.Dept. of Chemistry. Universitas Negeri Jakarta. Jalan Rawamangun Muka 13220. Jakarta Indonesia
4.Dept. of Biology. Universitas Negeri Jakarta. Jalan Rawamangun Muka 13220. Jakarta Indonesia

Abstract
Structure, and electrical properties of human bloods are studied. The system exhibits a random structure. The X-ray powder diffraction data shows that nano sized human blood has beed formed. Scanning electron microscope analysis exhibits fine structure of human blood. Electrical data of current–voltage characteristics of human blood were measured and analyzed at room temperature.

Keywords
Human blood, nano sized, fine structure , current–voltage

Topic
Physics

Link: https://ifory.id/abstract/C2EAYPkgedR6

Corresponding Author
Erfan Handoko

Institutions
1.Dept of Physics. Universitas Negeri Jakarta. Jalan Rawamangun Muka 13220. Jakarta Indonesia
2.Dept. of Physics. Syiah Kuala University. Banda Aceh. Indonesia
3.Dept.of Electrical Engineering. Universitas Mercu Buana. Jalan Meruya Selatan No.1 Jakarta. Indonesia

Abstract
In order to study a new microwave absorbing properties in the X-band frequency range, magnetic materials of BaFe12O19 and BaFe10CoZnO19 were synthesized by ceramic method. Microwave absorbing properties of multi nanolayer absorbers, composed of BaFe12O19 and and BaFe10CoZnO19 with a total thickness of 1 mm, 2 mm and 5 mm, were characterized at room temperature using vector network analyzer (VNA) Rohde‐Schwarz ZVA 67 to measure the reflected signal (S11) and transmitted signal (S21) for 7 – 13 GHz frequencies. Reflection loss (RL) of multi nanolayer magnetic materials were calculated using the transmit line theory. The RL of microwave radiations from multilayer magnetic materials is calculated and strongly depends on thickness of multi nanolayer absorbers and showed an optimal RL.

Keywords
BaFe12O19, BaFe10CoZnO19, reflection loss, multi nanolayer absorb

Topic
Physics

Link: https://ifory.id/abstract/74qVexaTFCDP

Corresponding Author
Erfan Handoko

Institutions
1.Dept of Physics. Universitas Negeri Jakarta. Jalan Rawamangun Muka 13220. Jakarta Indonesia
2.Dept. of Physics. Syiah Kuala University. Banda Aceh. Indonesia
3Dept.of Electrical Engineering. Universitas Mercu Buana. Jalan Meruya Selatan No.1 Jakarta. Indonesia

Abstract
In order to study a new microwave absorbing properties of single and double layer barium hexaferrite and silika have been investigated in X-band (8.2–12.4 GHz) frequencies. Barium hexaferrite BaFe12O19 was synthesized by ceramic method and Silica SiO2 was prepared from beach sand. Barium hexaferrite and silica with a total thickness of 2 mm, 4 mm, 6 mm, 8 mm and 10 mm, were characterized at room temperature using vector network analyzer (VNA) Rohde‐Schwarz ZVA 67. Reflection loss (RL) of single and double-layer absorbers of barium hexaferrite and silica were calculated using the transmit line theory. The double-layer absorbers exhibit better absorption performances with a stronger microwave absorption and a wider effective absorption bandwidth in comparison with the single-layer absorbers at the same thickness

Keywords
Single and double layer, BaFe12O19, SiO2, reflection loss.

Topic
Physics

Link: https://ifory.id/abstract/wDeFUWAGJ2fm

Corresponding Author
Theofany Harley Chriswardana

Institutions
*aditiya.harjon[at]sampoernauniversity.ac.id

(1) Department of Mechanical Engineering, Sampoerna University, Jl. Raya Pasar Minggu, Kav 16, Jakarta 12780, Indonesia

(2) Department of Applied Physics, Sampoerna University, Jl. Raya Pasar Minggu, Kav 16, Jakarta 12780, Indonesia

Abstract
Through centuries the side effect of the massively growing of population is the energy demand and consumption. As a result of this, the world energy used from the non-renewable fossil fuel has reached 80%. To counter this, researchers have found alternatives for this fossil fuel; and bioethanol is one of the alternative and sustainable options. One source of bioethanol that is believed carrying high production potential is photosynthetic algae or green algae. In this study, Chlorophyta (Green Algae) was hydrolyzed using microwave irradiation. Operation Mode (OM) was varied to observe its effect during the hydrolysis stage. Further, hydrolysis time (t) was also selected as the variable in this study to examine the result of reducing sugar. From the result of this experiment, it is projected that the sugar produced from hydrolysis assisted by microwave irradiation would bring a high-quality bioethanol production. Also, from this study, it would exhibit the great potential of bioethanol from green algae as the fossil fuel substitute in order to create a more sustainable and environmentally friendly energy source.

Keywords
Biofuel; Renewable energy: Bioethanol

Topic
Mechanical Engineering

Link: https://ifory.id/abstract/YKJCMd6GRwqr

Corresponding Author
Eva Dwi Minarti

Institutions
a)mathematics education, Universitas Pendidikan Indonesia b) IKIP Siliwangi
*eva.arti[at]student.upi.edu

Abstract
This study aims to examine the effect of the mathematical disposition of junior high school students on mathematical communication skills. This study used a correlation method with a quantitative approach. The subjects in this study were 31 student which is eighth grade at one of the junior high schools at Bandung. The instrument used consists of a test instrument which is a test of mathematical communication skills with the indicator is forming a mathematical model; arguments based on analysis of images and concepts; and the appearance of conceptual models, such as images, diagrams, tables and graphs and non-test instruments in the form of questionnaires about students mathematical dispositions. The results of the study show that the mathematical disposition of junior high school students has a positive influence on mathematical communication skills. Students who have a positive disposition towards mathematical learning tend to be active and can express ideas well.

Keywords
Mathematical Disposition, Mathematical Communication Ability, Middle School Students

Topic
Mathematics

Link: https://ifory.id/abstract/VdYavgEH2Kep

Corresponding Author
Agus Setyo Budi

Institutions
aDepartment of Physics Education, Universitas Negeri Jakarta
Jl. Pemuda 10, Rawamangaun, Jakarta 13220, Indonesia
bDepartment of Physics Education, Universitas Sultan Ageng Tirtayasa
Jl. CIwaru Raya No 25, Serang, Banten, Indonesia

Abstract
The purpose of this research is to develop a new web-based Mobile Digital Education design to measure character education using as an effort to face the era of disruption. E- Character Mental Revolution (E-CMR) Based on Mobile Digital Education (MDE) for Student Competency Improvement in Facing the Disruption. The research method used was a mixed method with the research subject being 80 students in Islamic boarding schools and 80 students in one of the state colleges in Banten, Indonesia of aged 19-22. The scores were analyzed using both qualitative and quantitative methods. The results obtained that MDE-based E-CMR can improve the cognitive competence of students in Islamic boarding schools with an N-gain score of 7.4 high categories and improve cognitive competence of students of colleges with an N-gain score of 7.6 high categories. It can be concluded that the MDE-based E-KRM is significant in increasing the competence of students and students in facing of the disruption.

Keywords
Mobile Digital Education (MDE); Competence of Students; E-Characters Mental Revolution (E-CMR); Disruption.

Topic
Computer Science

Link: https://ifory.id/abstract/4htMd3XNTbjJ

Corresponding Author
Lina Siti Nurwahidah

Institutions
Institut Pendidikan Indonesia Garut

Abstract
Mobile learning is a technological innovation that makes teaching material accessible at any time with more interesting visualization. The use of interactive learning media has progressively contributed to the information delivery process development. This study aims to describe the contribution of mobile learning in improving the understanding of news item text generic structure. The increased understanding of the text was identified through analyzing and classifying respondents understanding of the main events, the context of the event, and the sources of information enclosed in a news item text. The results of the study showed that the use of mobile learning is so effective in conveying information that it can increase respondents understanding in identifying the generic structure of the news item texts. In the digital era, mobile learning can be used as a medium to deliver information both formally and non-formally.

Keywords
Mobile Learning, Generic Structure, News Item Text

Topic
Computer and Communication Engineering

Link: https://ifory.id/abstract/BXw9Fkn6quRK

Corresponding Author
Yuniar Purwanti

Institutions
a) Institut Pendidikan Indonesia Garut, Jalan Pahlawan No 32 Garut
*myyuniar[at]gmail.com
*yuniar[at]institutpendidikan.ac.id

Abstract
Student engagement is an important element in learning. Mobile learning is a learning media that can facilitate student engagement. The purpose of this study is to measure student engagement in problem solving behavior abilities; explanation; and analysis using mobile learning. Qualitative analysis is divided into three stages, namely preliminary studies, literature studies and observations involving thirty students. The engagement of students shows a sufficient tendency to solve problems, explain learning material and analyze.

Keywords
Mobile Learning, Students Engagement

Topic
Computer Science

Link: https://ifory.id/abstract/9kH6ht7BXxdF

Corresponding Author
adi susetyaningsih

Institutions
Sekolah Tinggi Teknologi Garut

Abstract
In seeing the threat of a disaster, the community must have the capability to respond. Disaster risk increases for those who do not prepare themselves for the possibility of a disaster. The purpose of this study is to make a model of harmony of human interaction with the environment in which they live. People living in disaster-prone areas must have an awareness of behavior that can increase community resilience to disasters. The ecological approach can be used to see the interaction of the community with its physical environment. The data in this study were obtained by observation and in-depth interviews with residents living along the banks of the Cimanuk river in Garut City District and reinforced from literature studies. Respondents were selected by community random sampling on the banks of the Cimanuk river which was affected by banjir bandang in 2015. The results of the interviews were analyzed in a qualitative descriptive manner. Physical environmental factors that shape the behavior of community adaptation are land characteristics, rainfall, river border conditions. Community behavior in dealing with disaster risk is determined by the perception of self-determination that shape attitude or attitude is an awareness of the safety of life and property. In addition, there are also social norms or subjective norms that will strengthen peoples attitudes in disaster response efforts, namely religious norms and basic knowledge about the environment. Supporting facilities in the form of physical infrastructure, support of financial resources and institutions as a place to support community interaction in responding to the potential for flood disasters in their residential environments are also a necessity in building disaster response communities. community behavior in preparing themselves for the risk of disasters that arise.

Keywords
ecological approaches, disaster response, riverbanks, behavioral adaptation,

Topic
Civil Engineering

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

Corresponding Author
A.A GDE SATIA UTAMA

Institutions
a) Department of Accountancy, Economics and Business Faculty, Airlangga 4-6, Surabaya, 60286, Indonesia
*gde.agung[at]feb.unair.ac.id
b) Department of Accountancy, Economics and Business Faculty, Airlangga 4-6, Surabaya, 60286, Indonesia
c) Department of Accountancy, Economics and Business Faculty, Airlangga 4-6, Surabaya, 60286, Indonesia
d) Department of Accountancy, Economics and Business Faculty, Airlangga 4-6, Surabaya, 60286, Indonesia

Abstract
This paper seeks the role and affects the implementation of a knowledge management system at PT. Semen Indonesia. Semen Indonesia with Centre of Champs (SICC) to the innovation creating the process and maintain the stability before-at-after acquisition, as the strategic holding company. The qualitative Case study with direct balanced participation method used in this research. The approach helps perform means-end analysis, thereby uncovering the structural origin and the role of SICC in the managerial process, and how the far the knowledge management through SICC would affect the performance of the company. This method needs direct research to understand the real case in daily activity. The contributions this research want to examine the first multinational stated owned company maintain their performance with the knowledge management system. Also, prove the impact of the SICC as the implementation of knowledge management on the management process in real case situation. The actual natural problem and factual context of the industry and examine how PT. Semen Indonesia would react with the situation.

Keywords
knowledge management; acquisition process; Innovation; PT. Semen Indonesia

Topic
Management Science

Link: https://ifory.id/abstract/kqJDvgKtfR7C

Corresponding Author
Undang Syaripudin

Institutions
a) UIN Sunan Gunung Djati Bandung, Indonesia
b) Department of Information Communication Technology AeU, Malaysia

Abstract
This study presents a discussion of the tridharma-based university knowledge portal model (education, research, and community service). This study aims to ensure that lecturers activities are in accordance with the tridharma of higher education and national standards of higher education. The analytical method used is the literature review, with the object of research being hypothetical colleges in the form of universities. Based on the results of the identification of university needs, the knowledge portal model is required to have the ability to develop lecturer competencies in accordance with the tridharma of higher education. Knowledge portal is designed to have the ability to manage knowledge well, by providing facilities: information gathering, information categorization, information distribution, information collaboration, information retrieval, and knowledge sharing.

Keywords
knowledge portal, knowledge sharing, information retrieval

Topic
Computer Science

Link: https://ifory.id/abstract/XgYu3KQwRrxN

Corresponding Author
M. Haris Satria

Institutions
Universitas Bina Darma, Jl. Jend. Ahmad Yani No.3, Palembang 30264, Indonesia

Abstract
This research focused on 1) developing a teaching model for fundamental motor skills based on games for children with moderate mental disabilities and 2) obtaining empirical data about the effectiveness of the results of this model. This is a research and development project. The sample for this research consisted of children with moderate mental disabilities in SD SLBC Karya Ibu, SD SLBC YPAC, and SD SLBB Pembina. The results of this study showed that there were 88 basic motor skill variants that need to be taught. The results of the small group test and the large scale tests of this model showed the product produced can already be applied by children with moderate mental disabilities, however, they still need guidance. Finally, effectiveness tests showed that there was significant improvement in motor skill abilities (locomotive, non-locomotive, and manipulative). Based on this research, it is evident that this product can be fruitfully used as a method to increase fundamental motor skills ability in children with moderate mental disabilities.

Keywords
fundamental motor skills, moderate mental disabilities

Topic
Sport Science and Technology

Link: https://ifory.id/abstract/qrwjQG3J4cWD

Corresponding Author
arif rahman saleh

Institutions
Institut Teknologi Sepuluh Nopember

Abstract
Oil palm plantations produce waste that has not been used so far, namely oil palm fronds. This waste can be converted into energy in the form of gas using gasification technology. This study aimed to model the gasification process using Aspen PLUS in a multi-stage gasifier by inputting air at the pyrolysis and oxidation zone. The prediction of the modeling results is compared with the results of an experimental study of oil palm frond gasification from the literature. The influence of variations in air ratio (AR) between the pyrolysis and oxidation zones (0% - 50%) and the effect of gasification temperature from 700oC - 1000oC on the syngas composition were analyzed. Besides, the equivalent ratio (ER) is also varied from 0.3 - 0.5 to get the optimum syngas composition. From the modeling results, the rate of CO production is increased along with the increase in the temperature of pyrolysis while CO2 and char decrease. Besides, H2O and H2 also increase because the significant amount of inherent moisture is released from the feedstock. However, CH4 is unpredictable. Overall, Aspen PLUS modeling in this study can be used to obtain optimum operating conditions with variations of ER and AR.

Keywords
oil palm frond, multi-stage gasifier, gasification, syngas

Topic
Mechanical Engineering

Link: https://ifory.id/abstract/ExKk97BQY2Z3

Corresponding Author
Ibnu Hajar

Institutions
a) Sekolah Tinggi Teknik PLN Jakarta
Menara PLN, Jl. Lingkar Luar Barat, Duri Kosambi, Cengkareng, Jakarta, Indonesia 11750
*) ibnu.hajar[at]sttpln.ac.id

Abstract
The Solar cell performances as a power plant does not only convert energy, so that electricity is generated, but in the study of power systems it becomes a major element that has an important role in the study of power systems. As a power system element, the Solar cell acts as an element of electricity generation in this study modeled as a PV system and connected to the network, so it must meet the requirements of the electric power network operation. Through MATLAB / SIMULINK modeling and simulation, a 100 kW peak Solar Cell power plant has been modeled connected to the network. From the simulation and analysis obtained, this Solar Cell model shows that the connected load affects the voltage condition but does not affect the frequency. The load power factor also affects the network, namely with a lower load power factor, it affects the voltage on the grid.

Keywords
Photovoltaic, Modeling, Simulation, Grid

Topic
Electrical Engineering

Link: https://ifory.id/abstract/v2KhubUmHZCf

Corresponding Author
Metha Islameka

Institutions
Institut Teknologi Bandung

Abstract
Regenerative braking is a way to harvest electric energy from braking mechanism which usually implemented in electric vehicles. Braking strategies are required to maximize the use of regenerative braking systems. This research aims to design a regenerative braking model for a medium-sized electric bus. Measurements of latitude, longitude, elevation, and speed were firstly conducted by using GPS-based Osmand Android application. Transjakarta Corridor 1 (Kota-Blok M) was used for a test track with a distance of 14 km. Besides using GPS data, WLTP (Worldwide Harmonised Light Vehicle Test Procedure) data is also used for comparison. This study produced a braking strategy model that considers aerodynamic, rolling, and grade resistances as well as electrical component specifications of the electric bus. The model design is then compared to the existing serial, parallel and eco-models. With the design of this system, the regenerative braking model can harvest more energy which increases the mileage of the electric bus.

Keywords
Regenerative Braking, Energy Efficiency, Eco Model, Electric Bus

Topic
Mechanical Engineering

Link: https://ifory.id/abstract/P6Y9uFQGRUq7

Corresponding Author
Ria Arafiyah

Institutions
Universitas Negeri Jakarta
Universitas Indonesia

Abstract
Usually, learners achievement is known by the end of the course, this is very late because of improvements to enhance the quality of learning cannot be performed. Learners achievement prediction can be used to solve this problem. Various attempts were made to get a learners achievement models are closer to reality. This study aims to review research on the factors that affect learner-s achievement and design of modeling on predicting learners achievement. Those models are explored to agree on which one is the best. The reason of that among others to several components can improve success such as teacher pedagogic methods, learning media, learners tools etc that can be refined along learning process so that will improve the learners achievement. This study compares and explores several models to seeks the strength and weakness of the models. We expected to find which models perform better compare each other and inform what factors can improve learner achievement.

Keywords
e-learning, modeling, predicting learners achievement

Topic
Computer Science

Link: https://ifory.id/abstract/L4kw8dnH3fBM

Corresponding Author
I Gusti Bagus Udayana

Institutions
Faculty of Agriculture. Warmadewa University, Denpasar, Bali, Indonesia
*E-mail address: bagusudayana64[at]gmail.com

Abstract
Pinggan Village area is an area that has great horticulture and tourism potential. This area is located in District Kintamani Bangli Regency. Pinggan village is located in the highlands with an altitude of 900-1300 m above sea level and has the potential of horticultural commodities of squash, tomato and chilli. The current condition, about 30% of the product is wasted as waste (rotten or exposed to pests), bargaining farmers are weak, cultivation is not optimal, there are exarat supply because it is unable to compete with producers from Java. The proposed activities are for the development of horticulture based agroindustry in Pinggan sub-district of Kintamani sub-district with various activities The results of the research are expected to have a significant effect on the increase of income, thus increasing the access of households to family food. Physically, no puteran on the plate, will pilaru entangled papier. Besides, by increasing agro-industry activity and sustainable food house will have an impact on economic growth and job opening so that it will increase food security.

Keywords
Agroindustry, horticulture, derivative products, Kintamani, Sustainable Food House (KRPL)

Topic
Management Science

Link: https://ifory.id/abstract/MB4kx8pdjvfy