Indonesia Conference Directory

Corresponding Author
Kirana Dyah Utari Kusumautri

Institutions
Universitas Sebelas Maret

Abstract
Lithium iron phosphate battery (LiFePO4, LFP) is one of the longest lifetime lithium ion batteries. However, its application in the long-term needs requires specific conditions to be operated normally and avoid damage. Battery management system (BMS) is the solution to this problem. The BMS designed in this study has three key features: monitoring, balancing, and protection. Arduino Nano as a microcontroller gives an advantage that is programable so that it can be used for all types of LFP batteries, without the need to re-create BMS. The results of this study indicate the ability of BMS in maintaining voltage values with passive balancing at 3.75V, disconnecting the input current and voltage under over and under conditions with protection, and displaying system monitoring conditions on the screen.

Keywords
battery management system, lithium iron batteries, monitoring, balancing, protection

Topic
Battery Technology and Management System

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

Corresponding Author
Metarsit Klinbanmor

Institutions
a) Department of Physics, Faculty of Science, Naresuan University, Phitsanulok, 65000, Thailand
b) Research Center for Academic Excellence in Applied Physics, Faculty of Science, Naresuan University, Phitsanulok, 65000, Thailand
*researchcmu[at]yahoo.com

Abstract
Lead-free Bi0.5(Na0.68K0.22Li0.10)0.5TiO3 + 0.003mol Sm2O3 (BNKLT-Sm) ceramics were synthesized via solid-state combustion techniques with calcination of 750–850°C and sintering temperature between 1025 and 1100°C for 2 h. The results showed that increasing the calcination temperature, the percent perovskite phase and particle size of the BNKLT-Sm powders were increased. The BNKLT-Sm powder calcined at 800°C provided the best condition without inducing any impurity phase. For the sintered ceramics, the influence of the sintering temperature on phase formation, microstructure and electrical properties was investigated. All samples sintered at different temperatures possessed a coexisting phase between rhombohedral (R) phase and tetragonal (T) phase and the R phase became dominant when sintering temperature increased. The microstructure of all ceramics showed a rectangular shape and anisotropic growth. The average grain size increased with increasing of sintering temperature. Dielectric and ferroelectric behavior displayed relaxor characteristics in all samples. The maximum dielectric constant at Tm (m) of 4777 and the high remnant polarization (Pr) of 5.03 µC/cm2 were obtained by the densest ceramics (5.85 g/cm3), which sintered at 1075°C.

Keywords
BNKLT-Sm; solid-state combustion; dielectric; ferroelectric

Topic
Metal alloys, ceramics and composite materials

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

Corresponding Author
Raynald Masli

Institutions
(a) Department of Aerospace Engineering, Bandung Institute of tecnology, Jalan Ganeca No. 10, Bandung 40132, Indonesia
*masliray20041997[at]gmail.com
(b) Department of Mechanical Engineering, Bandung Institute of tecnology, Jalan Ganeca No. 10, Bandung 40132, Indonesia

Abstract
As a form of transportation mode, railway vehicle must be able to protect passengers from fatalities while accidents occur. For that purpose, some parts of the vehicle are designed to dissipate impact energy and to guarantee passengers protection. This paper presents study on the performance improvement of impact energy absorbing system on light rail transit (LRT) by implementing an array of rectangular column crash boxes system. Numerical simulations were carried out with finite element method in order to evaluate response of the structures subjected to axial impact loads based on the International regulation, UIC/EN 15227. The crashworthiness performance of proposed design was then compared to those of the baseline system which used C-channel crash boxes. The systems performance indicators are the weight reduction and crashworthiness parameters. The simulations results showed that the proposed design is better since it is 42 kg lighter and from 5 crashworthiness parameters, 4 are improved.

Keywords
crashworthiness; light rail transit; collision; rectangular crash boxes; structural efficiency

Topic
Lightweight Structure

Link: https://ifory.id/abstract/Dh8GFd4KABEH

Corresponding Author
HERI SUGITO

Institutions
Physics Department, Diponegoro University

Abstract
Detection of heavy metal containment of soil pollution has been made by using laser-induced breakdown spectroscopy (LIBS). A pulsed Nd:YAG laser (1064 nm, 8 ns, 200 mJ) was focused on to a soil sample, which is prepared in the form of pellet, at atmospheric pressure. Emission spectra taken from the oil-contaminated soil and uncontaminated soil were obtained. The contaminated soil has almost the similar spectrum profile and contains the same major and minor elements as for the uncontaminated soil case. However, C-H molecular band was clearly detected in oil-contaminated soil, while no C-H band was detected in uncontaminated soil. For comparison, the emission spectra of contaminated and uncontaminated soil were also obtained by using XRD method, showing that the spectra taken by using LIBS is much better than the XRD case indicated by signal to noise ratio (S/N ratio).

Keywords
Laser-Induced Breakdown Spectroscopy, Soil Pollution

Topic
Computational and characterization of materials

Link: https://ifory.id/abstract/B8Q6nrdM7Wy4

Corresponding Author
Nia Agustiningsih

Institutions
STIKes Kepanjen

Abstract
Changes in body image are normal during adolescent development but it is also a challenge for adolescents to be able to accept or adjust due to changes in body image. The existence of wrong thoughts about body image will cause a teenager to do maladaptive behavior to improve Body Image Satisfaction This study aims to determine the description of body image satisfaction in adolescents aged 16-18 years. This research is a descriptive research. The population in this study were all teenagers aged 16-18 years at SMK 5 Muhammadiyah Kepanjen with simple random sampling technique with a sample size of 176 people. The study was conducted at SMK 5 Muhammadiyah Kepanjen in April 2019. The data were presented in the form of frequency distribution tables and narratives. The results showed that respondents who have a very good body image satisfaction numbered 4 people (2.27%), either 94 people (53.41%), there were 68 people enough (38.64%), less as many as 10 people ( 5.68). Based on these results that most adolescents are able to adjust to changes in their bodies during adolescence. But there are a number of teenagers who need to be considered because body image satisfaction is in the category of insufficient and lacking so that attention needs to be given to interventions that can improve body image satisfaction.

Keywords
Body image satisafaction, adolescents, 16-18 years

Topic
Psychiatric Health

Link: https://ifory.id/abstract/D3pMGHuw9Kqt

Corresponding Author
SEKAR UTARI

Institutions
1Balai Litbang Perumahan Wilayah I Medan, Puslitbang Perumahan dan Permukiman, Badan Penelitian dan Pengembangan, Kementerian Pekerjaan Umum dan Perumahan Rakyat.
2Subdirektorat Lingkungan dan Keselamatan Jalan, Direktorat Pengembangan Jaringan Jalan, Direktorat Jenderal Bina Marga, Kementerian Pekerjaan Umum dan Perumahan Rakyat.

Abstract
New road development, bridge, and toll road constructions will give impact to the environment. The road is a land transportation infrastructure which has an important role in the economy, society and culture, environment, politic, defense, and security. Besides, roads are goods and services distribution infrastructure, therefore, they become the lifeblood of society, the nation, and the country. Road and bridge development are essential needs for the society, therefore need to develop road design that can minimize the impact on the environment. Kelok 9 Bridge is a bridge that has applied green infrastructure design. The concept of Kelok 9 Bridge is Nature and Engineering in Harmony. The design of this bridge is one example that can minimize the impact on the environment. This study aims to determine the impact of this bridge construction on the environment and its compatibility to the sustainable road principle. The method used to determine the impact on the environment and compatibility with the sustainable road principle was using literature study. The results from this study are there are several environmental impacts from this bridge construction that can be reduced e.g., the changes in land use. On the other hand, this bridge has applied several principles of sustainable road.

Keywords
Kelok 9 Bridge; Green infrastructure; Environmental impact; Sustainable road

Topic
Disaster Management and Environmental Issues

Link: https://ifory.id/abstract/E2hbNfV8P6kp

Corresponding Author
Titik Budiati

Institutions
1 Food Engineering Department, Politeknik Negeri Jember, Mastrip PO Box 164
Jember 68101 East Java, Indonesia

2 Food Industrial Technology Department, Politeknik Negeri Jember, Mastrip PO
Box 164 Jember 68101 East Java, Indonesia

Abstract
The aim of the study was to evaluate antimicrobial activity of essential oil from plants as natural antimicrobial to inhibit Listeria monocytogenes. A total 6 essential oil extracted from galangal (Alpinia galanga), ginger (Zingiber officinale), lemongrass (Cymbopogon citratus), orange skin (Citrus sinensis), rosemary (Rosmarinus officinalis) and turmeric (Curcuma longa). By using Minimum Inhibitory Concentration (MIC), the highest and the lowest concentration of essential oil to inhibit the growth of L. monocytogenes was found on turmeric (7.394 % + 0.028%) and lemongrass oil (0.219 % + 0.001 %), respectively. By using disc diffusion assay, the highest and the lowest antimicrobial activity against L. monocytogenes was shown by lemongrass oil (7.460 + 2.792 mm) and orange skin oil (0 + 0 mm), respectively. Out of the essential oil tested, lemongrass oil showed the most promising antibacterial activity inhibit L. monocytogenes.

Keywords
Antimicrobial; Essential oil; Listeria monocytogenes; Natural

Topic
Food Safety

Link: https://ifory.id/abstract/Q3RwDVYFg6dU

Corresponding Author
Irma Palupi

Institutions
a) School of Computing, Telkom University
Jl.Telekomunikasi No.1, Kabupaten Bandung.

Abstract
We model the growth of tumor cell in the microscopic point of view by using logistic type of Ordinary Differential Equation. Our model consider proliferative and quiescence type of cell including what we call angiogenic capacity. The parameters of the model will be adjusted by comparing to the experimental data of Ehrlich and fibrosarcoma Sa-37. After obtaining a relevant model, we develop a numerical scheme to simulate effectiveness of chemotherapy drugs to block or to kill proliferative of Tumor cell population.

Keywords
Chemotheraphy respon, Tumor population growth kinetics, Ehrlich and fibrosarcoma Sa-37

Topic
Biomedical and Health Technology

Link: https://ifory.id/abstract/u6qFbARmpCPa

Corresponding Author
Muhammad Afnan Habibi

Institutions
(a) Universitas Negeri Malang
(b) Jacobs University

Abstract
Transformer had been widely used for supplying electric power to many motors, such as electric pumps, fans, or conveyors. The motor voltage may vary that is depending on its power and speed between one to another motor. The load needs the transformer which generate the proper voltage. Unfortunately, the working performance of transformer is decreasing because of its daily operation. In order to observe the working performance, the repetition of the transformer technical assessment is needed. This study provides the periodical inspection of high power transformer in maintenance and outage condition in the one of utility site in Indonesia. The checking activity maintains the eligible performance of the user device. The measurement of Sweep Frequency Response Analysis (SFRA) in the 5th unit had been done once in every six years. The measured result was obtained from 2007 until 2013. SFRA test diagnoses the characteristics of transformer winding and core by injecting low voltage at a certain frequency.

Keywords
SFRA, Transformer, Outage, Motor

Topic
Renewable Energy

Link: https://ifory.id/abstract/Dt6bfM2wunRa

Corresponding Author
Eka Lutfi Septiani

Institutions
1Department of Chemical Engineering, Universitas Internasional Semen Indonesia, Gresik 61122, Indonesia
2Department of Chemical Engineering, Institut Teknologi Sepuluh Nopember, Kampus ITS Sukolilo, Surabaya 60111, Indonesia
3Department of Material Process Engineering, Nagoya University, Furo-Cho, Chikusa-Ku, Nagoya 464-8603, Japan

Abstract
Nanofiber through electrospinning process has been developed as a promising material for wound dressing due to its large porosity and high surface area. This characteristic of nanofiber provides a good gas permeability surrounding the wound which prevents a healing failure. The best wound dressing not only maintain a wound has a good gas permeability but also has an active agent to give an antibacterial and antiinflammation property. This research aims to combine a synthetic polymer and active agent, polyvinylpyrrolidone (PVP) and Binahong extract (BE), become nanofibrous material. The electrospinning process was conducted in two steps. The first step is to obtain the best condition PVP electrospinning with the voltage of 10, 12, 15, 17 kV, then combined PVP to 2%, 5%, 8% of BE in the second step. The first step shows the best operation condition in 12 kV so that to be used in different BE percentage. Based on 2,2-diphenyl-1-picrylhydrazyl (DPPH) assay, the result indicates that reducing the BE composition will increase the antioxidant activity.

Keywords
nanofiber, electrospinning, binahong (basella rubra linn) extract, antioxidant activity

Topic
Smart materials

Link: https://ifory.id/abstract/QxYdvf26Lcjy

Corresponding Author
SRI WAHYUNI

Institutions
Department of Economics, Post-Graduate Medan State University

Abstract
The phenomenon that often occurred in connection with the exchange rate fluctuations in currency values is uncertain. Changes in behavior rupiah exchange rate against the U.S. dollar that occurred in Indonesia are affected by economic fundamentals and openness factors. The aim of this research is to analyze the influence of inflation, interest rate, openness, and exchange rate volatility Rp/USD to the exchange rate of rupiah exchange rate against the U.S. dollar. This research used Autoregressive Conditional Heteroskedasticity (ARCH) and Generalized Autoregressive Conditional Heteroscedasticity (GARCH) method. This research used three months data started at the first three months in 2008 until the fourth three months in 2018.According to the result of partial test results (z test) indicates that inflation, interest rate, openness and exchange rate volatility Rp/USD positive and significant effect on rupiah exchange rate against the U.S dollar partially. While the simultaneous test (F test) indicates that inflation, interest rate, openness and exchange rate volatility Rp/USD has significant effect on rupiah exchange rate against the U.S dollar simultaneously.

Keywords
Inflation, interest rate, openness, exchange rate volatility Rp/USD, rupiah exchange rate against the U.S dollar

Topic
Economics, Business and Management Education

Link: https://ifory.id/abstract/EH2mvAagWcDn

Corresponding Author
ELPINA IDOLA MALAU

Institutions
MEDAN STATE UNIVERSITY

Abstract
The aim of this research is to measure and determine the level of general inflation then calculate and determine the duration needed to diminish to the natural level. The variable in this research is general inflation in North Sumatera Province from 2007 to 2017. The method used is the model of autoregressive time series. Based on the results of the research using Eviews 6, the data showed that persistence of general inflation in Central Java is high, it is 0.85. As well as the time required to diminish the inflation back to natural level requires long time, they are 6 months. The suggestion from this study are expected through Inflation Control Team Regional (TPID) make some kind of policy that could control the inflation of foodstuffs in order to effect the shock can be anticipated that by making the traffic production and distribution of specialty food commodity linked per regency of North Sumatera province. To anticipate the effects of shock as a result of extreme weather may cooperate with the Meteorology and Geophysics Agency (BMKG) in monitoring and weather forecasting as an ingredient of the policy formulation

Keywords
Inflation persistence,General Inflation,Inflation Commodities Group,Autoregresive

Topic
Economics, Business and Management Education

Link: https://ifory.id/abstract/JXKWAvRpB7zV

Corresponding Author
Lutfi Nur

Institutions
a)Universitas Pendidikan Indonesia
Jalan Dr. Setiabudhi 229, Bandung, Indonesia
*lutfinur[at]upi.edu
b)Universitas Siliwangi
Jalan Siliwangi 24, Tasikmalaya, Indonesia

Abstract
This study aims to determine the effect of providing aquatic learning on cognitive abilities in early childhood. 10 children from Universitas Pendidikan Indonesia Pilot Laboratory Kindergarten, Tasikmalaya Campus, Indonesia, aged 5-6 years, were involved in this study. The instruments used in this study were structured observation, field notes and documentation regarding childrens cognitive abilities in aquatic learning which included class procedures, pool rules, play rules, instructional language, and movement mechanics. the results showed that cognitive abilities of early childhood increased after giving aquatic learning with a gain score of 13. This study concluded that aquatic learning has a positive impact on early childhood.

Keywords
Game-based aquatic learning, Cognitive ability, Early Childhood

Topic
Learning / Teaching Methodologies and Assessment

Link: https://ifory.id/abstract/VtZP7n3XfpkB

Corresponding Author
Fitri Ervina Tarigan

Institutions
a. English Applied Linguistic Study Program, Post Graduate School , Universitas Negeri Medan
*fitriervinatarigan[at]gmail.com
b. English Applied Linguistic Study Program, Post Graduate School , Universitas Negeri Medan

Abstract
This study dealt with the cognitive process of students in translating English Phrasal Verbs into Indonesian by using the think aloud protocol (TAP) technique and introspective interview. The objectives of the study was to elaborate the manner of cognitive processes occurring in translating English Phrasal Verbs into Indonesian. This research was conducted by descriptive qualitative design. The source of data was the bilingual students, they were sixth semester students of English Education Program at State University of Medan. The source of data were taken by using Snowballing Technique. The data consisted of the transcription of audio recorded observation of think-aloud protocols (TAP), and the transcription of interview. The findings showed that there are six behaviors available during the process of translation done by the students, namely 1) reading the text, 2) alternating between the SL and the TL 3) monitoring the proposed translation, 4) consulting the dictionary 5) paraphrasing, and 6) translation.

Keywords
Cognitive Process, Translation, English Phrasal Verbs, TAP

Topic
Social,Language and Cultural Education

Link: https://ifory.id/abstract/cZeW73AqNLBu

Corresponding Author
Sudarti Rahayu Ningsih

Institutions
a) English Applied Linguistics Study Program, Postgraduate School,
State University of Medan, Medan, Indonesia
Jl. William Iskandar Ps.V, Kenangan Baru, Percut Sei Tuan, Kabupaten Deli Serdang, Sumatera Utara 20221
*ningsihsudartirahayu[at]gmail.com
082277837011
b) State University of Medan, Medan, Indonesia

Abstract
The aim of this study was to elaborate the ways of the teenager speakers in Bukit Malintang maintained the Javanese addressing terms. It was conducted by using qualitative research design through case study approach. The data of this study were the teenagers utterances in form of words, phrases, and sentences which were gotten from interview transcript with interview guidelines as its instrument, and collected by observation and interview. There were 10 participants from teenagers as source of data for this study. Data were analyzed by using Miles, Huberman, and Saldana theory (2014) with the processes of data condensation, data display, and drawing and verifying conclusion. Result of this research revealed that from seven ways of Javanese Addressing Terms Maintenance which was proposed by Holmes (2013), there were five ways applied by the teenagers in maintaining Javanese addressing terms, but only four dominant ways were used by them as a whole in maintaining Javanese addressing terms, they were value the Javanese addressing terms as an important symbol of ethnic identity; use Javanese addressing terms in the worship activities such as in tadarus and wiritan, and in cultural activities such as in sungkeman, kenduri, punggahan, and wedding party; use Javanese addressing terms in every daily activities, and use it to family or the neighbor who live near and visiting each other.

Keywords
Javanese Addressing Terms, Language Maintenance, Teenagers

Topic
Social,Language and Cultural Education

Link: https://ifory.id/abstract/zEUjceMJ8LWB

Corresponding Author
Ika Vanesia Siagian

Institutions
a) English Applied Linguistic Study Program, Postgraduate School, State University of Medan, Medan, Indonesia
Jl. William Iskandar Ps. V, Kenangan Baru, Percut Sei Tuan, Kabupaten Deli Serdang, Sumatera Utara 20221 *vanesiasiagian[at]gmail.com 082391264492
b) State University of Medan, Medan, Indonesia

Abstract
Appraisal is a system of interpersonal meanings which concerns with evaluation. The evaluation is used to negotiate human social relationship. Attitude is one of interacting domains in appraisal which concerns with feelings such as emotional reactions, judgements of behaviour and evaluation of the things. The feeling can be delivered orally or written. In written form, attitude can be found in argumentative writing as this kind of genre deals with opinion and persuasion. In line with this idea, this study is aimed to investigate types of attitude and its realization used in students argumentative writing. The research was conducted by using qualitative design. The data were words or phrases taken from the students argumentative writing. The data were collected by using documentary technique and identify the words or phrases into types of attitude based on Martin and White theory (2005). The findings showed all types of attitude, i.e. affect, judgement and appreciation are used in students argumentative writing.

Keywords
Appraisal, Attitude, Argumentative Writing

Topic
Social,Language and Cultural Education

Link: https://ifory.id/abstract/kq7BNMt9vjzg

Corresponding Author
Adrian Rasyki

Institutions
UNIVERSITAS NEGERI MEDAN

Abstract
This research was aimed to investigate the loss and gain in translation process based on the equivalence in bilingual online news text. The objective of the research is to find out the kinds of loss and gain that found in the news text. Descriptive qualitative method was used in this research. Ten online news articles taken from berita2bahasa.com from june to july 2019 will be used as sources of data. The data of this study are text from both Source and Target Text consists of loss and gain elements based on equivalence found in 10 bilingual news articles. The text will be identified whether Loss and Gain information found based on equivalence theory. The results showed that there are different kinds of loss and gain that found in the texts in any level, such as word, phrase, and clause level. The paper notes that the use of Loss and Gain in news text is to achieve naturalness in translation. Since the translator can make the readers misunderstood of the original content of the source text, thus in translating news text the translator should have vast knowledge in both ST and TT to make the news text readable.

Keywords
loss and gain, bilingual news, equivalence

Topic
Social,Language and Cultural Education

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

Corresponding Author
Nizar Rahmanda Hardiyanto

Institutions
Physics Department, Faculty of Mathematics and Natural Sciences, State University of Malang
Jalan Semarang 5, Malang 65145, Indonesia
*hari.wisodo.fmipa[at]um.ac.id

Abstract
Vortex dynamics, current density, and free energy curves in type II superconductors have been studied based on the Time Dependent Ginzburg-Landau (TDGL) model. The intensity of the normal material defect and its position were varied to determine the difference in the free energy curve of the material when subjected to an external magnetic field. The curves of each energy term in the Ginzburg-Landau energy equation provide information about the dynamics of the vortex in reaching the equilibrium state of superconducting material. This study can help determine the defect arrangement for effective pinning preparation in superconducting materials.

Keywords
Superconductor; Pinning; Vortex; Ginzbug-Landau model

Topic
Computation and Other Related Field

Link: https://ifory.id/abstract/tq7kACWUrfyR

Corresponding Author
sugiono sugiono

Institutions
1,3Department of Industrial Engineering, Brawijaya University, Indonesia
2Deparment of Mechanical Engineering, Brawijaya University, Indonesia
4Department of Computer Engineering, Brawijaya University, Indonesia

Abstract
Drive density and irregularity are the main factors causing accidents in Indonesia. The purpose of this paper was to create an application that can identify changes in driving speed to become an early warning for drivers to make the right decisions. The initial step of this study was to study theories about changes in distance, sensor systems, and android applications. An observation of the existing traffic conditions in several locations in Indonesia plays an important role in prototype design. Assembly and accuracy test of sensor identification distance is equal to = 0.6% error. The android application successfully converted input data into a warning in the form of sound. It can be concluded that this application can provide effective early warning in the form of sound to easily understand by drivers.

Keywords
driving alert system, android application, safety driving

Topic
Engineering

Link: https://ifory.id/abstract/kXuR3fYG9vLQ

Corresponding Author
ADRIANA ADRIANA

Institutions
Chemical Engeneering, Polytechnic Negeri at Lhokseumawe
Jl. Banda Aceh – Medan Km 280 Buketrata Lhokseumawe, 24301

Abstract
The main objective of this research is to utilize fiber waste from palm empty fruit bunch provided very abundant in Aceh. For that needs to be studied and researched other benefits are more valuable. Among them is a source of raw material to produce nanocrystalline cellulose (NCC), a material in nanometer dimensions which can be used as fillers or reinforcing a matrix in order to provide bionanocomposites. NCC isolated from palm empty bunch fiber through the hydrolysis of sulfuric acid, using a solvent mixture of DMAC/LiCl, were passed on activated dialysis membrane after centrifugated to release it from solvent. NCC will be characterized include aspect ratio, morphology, thermal, structural test, and several other physical parameters. The end product is characterized by means of thermogravimetric analysis (TGA), Infrared Spectroscopy (FTIR), X-Ray Diffraction (XRD), Differential Scanning Calorimetry (DSC) and Scanning Electron Microscopy (SEM). From XRD and FTIR analysis showed that the nanocrystalline cellulose formed was nanocellulose I with an average size of 72 nm. DSC and TGA thermal test showed that the glass transition, melting point, and decomposition temperature of NCC were 109.59 o C, 191.28 ° C, 210 oC, respectively.

Keywords
palm empty fruit bunch, hydrolysis, dispersions, nanocrystaline cellulose.

Topic
Chemical Engineering

Link: https://ifory.id/abstract/Z4PnNBq7RfTL

Corresponding Author
Dadang Syarif Sihabudin Sahid

Institutions
a) Department of Information Technology, Politeknik Caltex Riau
Jl. Umbansari No. 1, Rumbai, Pekanbaru, Riau-Indonesia
*dadang[at]pcr.ac.id
b) Department of Mathematics, Universitas Islam Negeri Sultan Syarif Kasim
Pekanbaru, Riau-Indonesia
c) Department of Electrical Engineering, Politeknik Caltex Riau
Jl. Umbansari No. 1, Rumbai, Pekanbaru, Riau-Indonesia

Abstract
Flow experience as a psychological theory has been implemented in various fields. According the theory, flow is represented as anxiety, boredom, and flow. Considering psychological condition in learning activities can improve student performance. Thus, involving flow in learning particularly in e-learning becomes important. The challenge is how to identify flow state during students interaction with e-learning. In previous study, flow was measured by conducting questionnaire series after a learning process. This is inefficient. Additionally, this is often unnatural, since it cannot capture students learning behaviour. Therefore, this study presented flow experience identification when students interact with e-learning using rough set and machine learning approaches. Rough set is an efficient tool to solve uncertainty, imprecision, and vagueness. While, the fuzzy rule and decision tree, parts of machine learning methods were implemented as a comparison. As the results, the accuracy level of the rough set is 92.92%, fuzzy rule is 91.86% and decision tree is 92.39%. As a conclusion, this study showed that flow experience could be identified with high accuracy. In the context of e-learning, it can be used by e-learning to provide an adaptation. Appropriate adaptation is expected can keep the psychological condition of the students in the flow state.

Keywords
flow experience; rough set; machine learning; e-learning

Topic
Computer Science and Engineering

Link: https://ifory.id/abstract/rYhN67QyTH3R

Corresponding Author
Oktian Fajar Nugroho

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

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

Keywords
STEM Education; 21st century skills; Science Education

Topic
Integrated Science Education

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

Corresponding Author
Hasnah Hasnah

Institutions
1 Doctoral Program at Hasanuddin University, Makassar, Indonesia
2 Department of Maternity, Nursing Prody, Faculty of Medicine and Health Sciences, Universitas Islam Negeri Alauddin, Makassar, Indonesia
3 Department of Health Promotion, Hasanuddin University, Makassar, Indonesia
4 Department of Epideminology Hasanuddin University, Makassar, Indonesia
5 Department of Biostatistics Hasanuddin University, Makassar, Indonesia
6,7 Student Nurse, Nursing Study Program, Faculty of Medicine and Health Sciences, Universitas Islam Negeri Alauddin, Makassar, Indonesia

Abstract
Saharan has higher mortality rates than in Switzerland. Likewise in Indonesia, maternal mortality rates vary from one source to another. The maternal mortality rate has decreased every decade but is still far from the 2015 MDGs-3 target. The cause of maternal death has also changed from bleeding to hypertension in pregnancy, followed by infection. The highest maternal mortality in south Sulawesi occurred in Gowa Regency, then Bone and Jeneponto Regencies. Objective: describe the level of knowledge of health workers about the prevention of pre-eclampsia Method: Cross sectional study design conducted at 3 puskesmas namely Sombaopu, Samata, and Bajeng, from April to June 2019. sample size 29 people were nurses, midwives and doctors in the antenatal care room. The research instrument used a questionnaire of 25 questions about understanding, causes, symptoms and prevention of pre-eclampsia. Reliability test with Cronbach Alpha value of 0.756> 0.600 so that the instrument was declared reliable. Data analysis uses frequency distribution. Research ethic from the ethic committee of the Faculty of Medicine and Health Sciences Universitas Islam Negeri Alauddin Makassar Number A.110 / KEPK / FKIK / V / 2019 with No. Registrar UINAM19050110 Conclusion: Knowledge of health workers both in terms of understanding, signs and symptoms, and prevention in the good category unless the cause is in the sufficient category.

Keywords
Health Workers, Knowledge, Pre-Eclampsia

Topic
Maternal, neonatal and child health

Link: https://ifory.id/abstract/bpGqz7Mx2wrN

Corresponding Author
danial danial

Institutions
a. Medical Faculty of Mulawarman University
b,c,d. Medical Faculty of Hasanuddin University

Abstract
Background : Obesity has become a major worldwide health problem. Therefore, the associated morbidity, mortality and both medical and economical costs are expected to increase as well. the prevalence of obesity vary by social determinants and gender. Purposes : to investigate the association between obesity and dyslipidemia among Indonesian adult women base on demographic factors Methods:. A Biomedical data of Basic Health Research collected in urban area in Indonesia 2007 was used. A total 7248 women (aged 18-97) was analyzed. Obesity was expressed as Body mass index (BMI ≥ 25 kg/㎡ ) and waist circumference (≥ 80 cm). High total cholesterol ( ≥ 200 mg/dl), low HDL cholesterol (< 40 mg/dl), high LDL cholesterol (≥ 100 mg/dl) and high apolipoprotein B (≥ 101 mg/dl) Result : there are significant association between obesity (BMI ≥ 25 kg/㎡ ) and waist circumference (≥ 80 cm) and dyslipidemia (p <0.05) on demographic factors, except to the age group ≥ 40 years, high total cholesterol and high LDL cholesterol and obesity (BMI ≥ 25 kg / ㎡) on the level of education ≤ SD which is not significant (p> 0.05). Conclusion : it is a current recommendation strongly for women obesity

Keywords
obesity, dyslipidemia, woman, demografic factors

Topic
Uncommunicable disease related to women

Link: https://ifory.id/abstract/rBRpkctyn8eV

Corresponding Author
Martha Fani Cahyandito

Institutions
Universitas Padjadjaran Indonesia

Abstract
This research is conducted to provide solutions to the problems faced by traditional herbal sellers in Bandung Indonesia in facing the competition with herbal products containing chemical drugs and the development of modern medicine both from domestic and foreign countries. Ethnobotany studies is implemented (assessing the knowledge of herbal sellers regarding the types and parts of medicinal plants used, the method of cultivation and the benefits obtained, the active compound contents in medicinal plants), and the formulation on the business development strategy of traditional herbal medicine. The results are expected to increase the public knowledge towards traditional herbal medicine products which will then increase the purchasing power of herbal medicine among the society. The study is conducted by census of 27 traditional herbal medicine sellers in Bandung. The research method used is qualitative and quantitative methods, whereas the formulation on the business development strategy of traditional herbal medicine used SWOT analysis. The results indicated that there are as many as 24 types of medicinal plants from 13 tribes or families used as the raw materials of traditional herbal medicine. Knowledge of herbal medicine sellers about the benefits of herbal medicine is in accordance with the academic rules with the study of the literature regarding the content of active substances contained in medicinal plants used. The development of herbal medicine business can be conducted with the support of government regulation towards traditional herbal medicine, the utilization of knowledge possessed by herbal sellers in the procurement of medicinal plants (raw materials), and favourable marketing in facing the competition with traditional medicine from foreign countries i.e. China

Keywords
Ethnobotany, Medicinal Plants, Traditional Herbal Medicine, Business Development Strategy, Indonesia

Topic
Manajemen Strategi

Link: https://ifory.id/abstract/vMQrX2cdx6wW

Corresponding Author
Tri Cicik

Institutions
Jurusan Ekonomi dan Bisnis, Prodi Magister Manajemen, Universits Muhammadiyah Gresik

Abstract
The ojective of this study is to analyze and prove the influence of organizational culture, managerial motivation and leadership of corporate social responsibility, reputation and performance of the enterprises and SME proxies. Corporate culture can help to reinforce the values and norms of organization-s core.This study is a descriptive and verificative study in nature with proportional stratified random sampling technique. There are five respondents selected from each stage with a number of specified questionnaires as researdh instrument. The analysis technique used in study is structural equational modelling with partial least square method.The findings of this this study are as follow : managerial motivation and leadership affects the internal CSR; the internal CSR, managerial motivation, cultural organization and leadership affect the performance of SMEs. The next finding is that the reputation of State-Owned enterprises (BUMN) , organizational culture and leadership influenced the performance of BUMN. External CSR has an influence on the performance of SMEs, while organizational culture, managerial motivation and leadership variabels do not have any influence on the external CSR. Managerial motivation and performance of SMEs have no effects on the performance of SOEs and the performance of SMEs does not have any effects on the reputation of SOEs.This study has some limitations in that its findings cannot be generalized for all SOEs in Indonesia as environmental condion for each SoEs is different. As such, adaptation is needed for implementation. The second, this study do not group the respondents based on each SOEs. In the case of culture, not all SoEs formalize it in their system. Different SOEs for Different system.

Keywords
Organizational Culture,Corporate Social Responsibility, Corporate Reputation, Corporate Performance

Topic
Manajemen Sumber Daya Manusia

Link: https://ifory.id/abstract/AChFmwR63uLy

Corresponding Author
Shofia Amin

Institutions
FAKULTAS EKONOMI DAN BISNIS UNIVERSITAS JAMBI

Abstract
Turnover intention meski baru sebatas niat, tetaplah berpengaruh negatif terhadap sikap kerja. Karenanya berbagai upaya pengurangan turnover intention terus dilakukan. Penelitian ini bertujuan untuk menguji pengurangan turnover intention melalui keadilan dan komitmen organisasional pada karyawan medis dan non medis. Khususnya, menguji peran komitmen organisasional sebagai variabel mediator dalam hubungan antara variabel keadilan organisasional dan turnover intention. Data dikumpulkan melalui penyebaran kuesioner terhadap 151 karyawan medis dan non medis pada rumah sakit Baiturrahim Jambi. Analisis data dilakukan dengan bantuan program SmartPLS 3.2.7. Hasil penelitian menunjukkan bahwa pada karyawan medis, keadilan organisasional berpengaruh negatif signifikan terhadap turnover intention, sedangkan pada karyawan non medis, juga berpengaruh negatif namun tidak signifikan. Keadilan organisasional berpengaruh positif signifikan terhadap komitmen organisasional pada karyawan medis dan non medis. Komitmen organisasional juga berpengaruh negatif signifikan terhadap turnover intention pada karyawan medis dan non medis. Komitmen organisasional terbukti berperan signifikan sebagai variabel mediator dalam hubungan antara keadilan organisasional dan turnover intention. Implikasi penelitian ini menunjukkan bahwa pengurangan turnover intention lebih dapat dilakukan melalui peningkatan komitmen organisasional pada karyawan medis dan non medis. Sedangkan peningkatan keadilan organisasional berpengaruh negatif signifikan terhadap pengurangan turnover intention hanya pada tenaga non medis saja.

Keywords
Keadilan Organisasional, Komitmen Organisaional, Turnover Intention, karyawan medis dan non medis

Topic
Manajemen Sumber Daya Manusia

Link: https://ifory.id/abstract/jEMeRF7dmXkY

Corresponding Author
I Made Bayu Dirgantara

Institutions
Universitas Diponegoro Jl. H. Prof. Soedarto, SH., Tembalang Semarang 50275 Indonesia
*imadebdirgantara[at]gmail.com

Abstract
The growing popularity of mobile technologies and applications, lead many companies to develop relations with consumers through mobile applications, include banking industry with their mobile banking application. Thereofere, it is important to understand how to design applications based on consumer preferences.This research aimed to analyze which features of mobile banking can driven customer engagement and lead to continued intention to use of application in Semarang city. This research used 150 respondents as mobile banking application users in Semarang. The sampling method used a non-probability sampling method with a purposive sampling technique. The Collecting data used quantitatif method with questionnaire media. This research examines the hypothesis by using Structural Equation Modeling (SEM). The findings show that functionality, design interface, interaction and information quality featureshave a positive and significant relationship on customer engagement (as an intervening variable) and customer engagement has a positive and significant effect on continues intention to use.

Keywords
Functionality, Design Interface, Interaction and Information Quality, Customer Engagement, Continued Intention to use.

Topic
Manajemen Pemasaran

Link: https://ifory.id/abstract/Vwqup6RnUTCA

Corresponding Author
Setia Budi

Institutions
Department of Chemistry, Universitas Negeri Jakarta

Abstract
Polyaniline film was synthesised by electropolymerization method to produce conductive layer as a substrate for NiCo alloy preparation. The obtained film was characterised by Fourier transform infrared spectrometer (FTIR), X-ray diffractometer (XRD), scanning electron microscope (SEM) and differential scanning calorimeter (DSC). The electrodeposited polyaniline was emeraldine base with cross-linking and crevice morphology. The film was then employed as working electrode in NiCo electrodeposition. Morphological analysis showed a uniform surface of the metallic deposit was successfully grown onto the polyanyline film with Ni and Co composition of 59.66 wt.% and 29.47 wt%, respectively. This result shows the future application of the electroplymerised polyaniline as a host material for fabrication of ferromagnetic alloy using electrodeposition technique.

Keywords
Electropelymerisation

Topic
Metal alloys, ceramics and composite materials

Link: https://ifory.id/abstract/dAXknup9TmNr

Corresponding Author
Riri Jonuarti

Institutions
a) School of Energy, Bandung Institute of Technology
Jalan Ganesha 10, Bandung 40132, Indonesia
*riri.jonuarti[at]gmail.com

b)Department of Physics, Universitas Andalas, Jalan Universitas Andalas, Limau manis, Padang, 25163,
Indonesia

Abstract
A density functional theory (DFT) method was used to study the structures, stability and band gaps of the ultra-small armchair boron nitride nanotubes (BNNTs). We define the ultra-small size of the armchair boron nitride nanotubes (BNNTs) as a nanotube with diameter less than 1 nm. Each armchair nanotube-s stability and band gap was obtained varied by varying the size of nanotube diameters up to 1 nm. The larger size of diameter the higher stability and wider armchair nanotubes band gap. The results of the ultra-small armchair calculation confirm the same trend of properties with the available calculation data of ultra-small zigzag nitride nanotubes (BNNTs).

Keywords
The density functional theory (DFT); ultra-small armchair boron nitride nanotubes (BNNTs); structures; stability; band gap

Topic
Computational and characterization of materials

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