Indonesia Conference Directory

Corresponding Author
Lolita Endang Susilowati

Institutions
University of Mataram

Abstract
The drought tolerant phosphate solubilizing bacteria is needed to dissolve phosphate (P) inorganic which is usually low in availability at dry land. This study is aimed to obtain a consortium of drought tolerant phosphate solubilizing bacteria which has high potential in dissolving P-inorganic. An experimental study which has 4 treatments of bacterial combinations has been conducted in a laboratory. The first treatment was the combinations of Pseudomonas azotoformans (PA), Acinetobacter baumannii (AB) and Bacillus paramycoides (BP). The second treatment was the combination of PA and AB. The third treatment was PA and BP, then the fourth treatment was AB and BP. The potential of the consortium bacteria in dissolving P-inorganic was measured qualitatively using phosphate dissolution index (FDI) on solid pikovskayas medium. While, the potential of the consortium bacteria in dissolving P-inorganic was measured quantitatively by measuring dissolved P using the ascorbic acid method in liquid pikovskayas medium containing 0.5% Ca3(PO4)2. The results showed that the consortium of those three bacteria (PA AB and BP) has the best potential to dissolve P-inorganic compared to other combinations. In addition, the three bacteria combination also resulted in the highest dissolved P with 0.29% potential dissolution, followed by combination of AB and BP (0.19%), and PA and BP (0.18%), respectively. Thus, before the consortium of these three bacteria is applied in soil, it is needed further experiment of potential of the bacteria in dissolving soil P-inorganic.

Keywords
drought tolerant, phosphate solubilizing bacteria, dissolved P-inorganic, pikovskayas medium

Topic
Biology

Link: https://ifory.id/abstract/7Qvdn6AgFWwM

Corresponding Author
kristoko hartomo

Institutions
Faculty of Information Technology, Satya Wacana Christian University, Jalan Diponegoro 52-60 Salatiga, Indonesia

Abstract
Natural disasters which often happens in several cities in central java demanding the government institutions to help the victims. The distribution itself has problems in determining the shortest route which should be chosen properly. Dijkstra algorithm is applied in choosing the shortest route. Dijkstra algorithm is a algorithm that can determine the shortest line from the boarding point to the arrival point by the smallest weight, to display into a map that used google maps api technology. Google maps api is free services provided by google that can be accessed by a browser. This research application logistics produce the distribution of natural disasters with applying dijkstra algorithm on finding shortest route.

Keywords
disaster; distribution; shortest route; algorithm; dijkstra

Topic
Computer Science

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

Corresponding Author
Rodi Hartono

Institutions
Departemen Teknik dan Ilmu Komputer, Universitas Komputer Indonesia, Indonesia
Departemen Teknik dan Ilmu Komputer, Universitas Komputer Indonesia, Indonesia
Departemen Teknik dan Ilmu Komputer, Universitas Komputer Indonesia, Indonesia

Abstract
The purpose of this study is to identify the importance of using information technology for security, especially for supervision. The method used in this research is descriptive method, describing the function of using smart phones as a security tool. The results of this study that smart phones can be used as a security tool by using a cellphone camera as a surveillance camera and wireless computer network. This research was carried out with the results of analysis and experiments using previous references and supporting equipment. From the results of this study it can be found that smart phones can be utilized as security systems. Therefore the results of this study can be utilized by various parties or can be used as a reference in the use of technology and information.

Keywords
design , smart Phone , camera

Topic
Computer Science

Link: https://ifory.id/abstract/HU6Wd9PRYmxG

Corresponding Author
Novie Susanti Suseno

Institutions
Economy Faculty of Universitas Garut
Samarang no. 52A Garut 44151, Indonesia
*noviesusantisuseno[at]uniga.ac.id

Abstract
This study aims to analyze the factors that influence the performance of accounting information systems on the effectiveness of the internal control system at geothermal energy company. The research method used is causalitas method. Respondents in this study consisting of employees in the system development department, finance and managers. The data were analyzed by using double linear regression. The results showed that the factors of personal technical ability, user involvement in the system development process, training and education programs, formalization of information system development, top management support and community affiliation had an effect on the performance of accounting information systems. The factors of personal technical ability have the biggest influence on the performance of accounting information systems. Besides that information system performance had an effect on the effectiveness of the internal control system. The contribution of this research produces a generic model that can be adopted by the same organization in increasing the effectiveness of the internal control system.

Keywords
Accounting Information Systems, Effectiveness of Internal Control Systems, Formalization of Information System Development, Top Management Support.

Topic
Computer and Communication Engineering

Link: https://ifory.id/abstract/wzq3Btj6TNQ8

Corresponding Author
BAMBANG HERU ISWANTO

Institutions
*Department of Physics, Universitas Negeri Jakarta, Jakarta 13220, Indonesia
**Department of Physics, Universitas Negeri Malang, Malang, Indonesia

Abstract
Measurements of the magnetic susceptibility and chemical elements have been carried out on soils or sediments in various depositional environments for various purposes. Theoretically, the magnetic mineral content in nature is generally ferromagnetic which is characterized by the presence of an element of Fe and is positively correlated with the value of magnetic susceptibility. However, the presence of measured elements does not always have a positive correlation with magnetic susceptibility or very low. In this study, we propose a method to find out the magnetic factor that correlates significantly with magnetic susceptibility. The method consists of several steps: (i) a correlation analysis between magnetic susceptibility and each measured element is carried out; (ii) the elements that have a positive correlation are chosen as dominant elements; (iii) determine the magnetic factor as aggregation of the dominant elements. The method has been tested for various depositional environments and successfully found the magnetic factor of dominant elements with a very significant correlation value. The discovery of dominant elements that contributes to magnetic susceptibility will facilitate the determination of the minerals carrying magnetic properties and can be used as an indicator of environmental conditions.

Keywords
magnetic susceptibility, chemical elements, selection method, sediment

Topic
Physics

Link: https://ifory.id/abstract/h8Qk2c7Z63Xm

Corresponding Author
Wafa Maftuhin

Institutions
Faculty of Engineering and Technology, Sampoerna University, South Jakarta 12780, Indonesia

Abstract
We present a self-consistent charge density functional tight-binding (SCC-DFTB) parameterization for boron clusters. In the parameterization we devote more attention to the repulsive energy in the SCC-DFTB theory and examine the quality of the parameter fitted to different sets of reference structures. To test the quality of the parameter, we combine the SCC-DFTB with modified basin hopping method (MBH) to search for global minima of small boron clusters Bn (n=3-13). In closer examinations, we found the repulsive potential fitted to trimer is a compromise among the reference structures judging from the variation of the potential curve and the geometry that it yields. On comparing further our calculated lowest energy boron clusters are very good agreement with other theoretical calculations.

Keywords
Density Functional Tight Binding; Repulsive Potential; Boron Clusters

Topic
Physics

Link: https://ifory.id/abstract/ag4urGWHdXL2

Corresponding Author
Asep Maosul

Institutions
Universitas Pendidikan Indonesia

Abstract
Analysis of the use of SPOT in the process of learning in the Universitas Pendidikan Indonesia is very important, so that it can be known to what extent the use of SPOT can be used as self-directed learning for Students at the Universitas Pendidikan Indonesia, especially in Culinary of Educaion Education Study Program. In this study, data was collected from 61 student respondents in the Culinary of Education Study Program 2016 at the Universitas Pendidikan Indonesia using SPOT . The variables studied were the documentation process on SPOT, SPOT operation, and SPOT accessibility. The research instrument used in this study was a questionnaire. The results of data analysis can be explained that the use of SPOT as an application in the learning process is said to be very feasible seen from the results of processing observational data as much as 91.3%. The results of the observation data processing as much as 88.3% have been very feasible to operate the SPOT application used in the learning process. The feasibility of the results of the accessibility test on the use of SPOT by analyzing the results of observations on students 80% is very feasible for the accessibility of the SPOT application used in the learning process.

Keywords
Self-directed learning; online learning system; SPOT UPI

Topic
Computer and Communication Engineering

Link: https://ifory.id/abstract/yA9ZVBXRDmhq

Corresponding Author
Nunung Kurniasih

Institutions
(a)Department of Chemistry, Faculty of Sciences and Technology, Sunan Gunung Djati Islamic State University, Bandung 40614, Indonesia
(b)Department of Chemistry, Faculty of Mathematics and Natural Sciences,Universitas Padjadjaran, Jatinangor 45363, Indonesia
(c)Department of Pharmacology and Clinical Pharmacy, Faculty of Pharmacy,Universitas Padjadjaran, Jatinangor 45363, Indonesia
(d)Central Laboratory of Universitas Padjadjaran, Jatinangor 45363, Indonesia
(e)School of Chemical Sciences, Universiti Sains Malaysia,11800 Minden, Penang, Malaysia
* Corresponding author: nunungkurniasih[at]uinsgd.ac.id

Abstract
Previous phytochemical studies from the Aglaia genus reported the presence of terpenoid compound. This research describe the isolation and structure elucidation of sesquiterpend compound from the stembark of Aglaia simplicifolia. Dried stembark of A. simplicifolia extracted with methanol and then partitioned with n-hexane, ethyl acetate, and n-butanol, respectively. The n-hexane extract then was separated and purified with chromatography techniques to obtain isolated compound. The chemical structure of isolated compound were elucidated by IR, NMR 1D, NMR 2D as well as mass spectra and by comparison with those previously reported spectra data. The compound identified as senecrassidiol.

Keywords
Aglaia simplicifolia, stembark, senecrassidiol.

Topic
Chemistry

Link: https://ifory.id/abstract/c2EvpJy6n4Fx

Corresponding Author
Sri Wardani

Institutions
Faculty of Medicine and Health Sciences, University of Warmadewa, Bali, Indonesia

Abstract
Abstract. Chronic Kidney disease-mineral bone disorder (CKD-MBD) are complication of patients on chronic hemodialysis therapy. This study is a cross-sectional descriptive analytic study aims to examine concentration of serum calcium as a marker of CKD-MBD. Calcium serum concentration were examined with spectrophotometer method than we computed into low, normal, and high serum calcium concentrations. This study recruited 100 chronic hemodialysis patients at Sanjiwani Gianyar Hospital and AriCanti Hospital, composed of 67 male and 33 female, mean of age is 52.52 ±12.81, duration of HD were 44,6 month. Most of the patients undergone hemodialysis 2 times a week (96 %) and performed HD 4.5 hour per session and 66% patients used AV fistula access. This study was found most of chronic hemodialysis patients (60%) has low serum calcium concentration <8.5 mg/dl. On Spearman correlation test, serum calcium concentrations in this study were significant influenced by serum creatinine concentration r = -0.461 and phosphate serum concentration r= -0.0273 on p < 0.001, respectively. Conclusions: most of the chronic hemodialysis patients in this study has low serum calcium concentration as a marker of CKD-MBD.

Keywords
CKD-MBD, hemodialysis, serum calcium concentration

Topic
Biology

Link: https://ifory.id/abstract/zh9CVb8njgud

Corresponding Author
Dewa Ayu Putri Sri Masyeni

Institutions
Sanjiwani Hospital/Faculty of Medicine and Health Sciences, University of Warmadewa

Abstract
Background: the increase level of serum phosphate is common due to secretion failure of the kidney on chronic kidney disease patients (CKD). The study objective is to determine the level of serum phosphorus among the CKD patient on chronic dialysis in Gianyar Bali. Methods: a prospective cross-sectional study was conducted in 100 serum of the patient visiting dialysis clinic in Sanjiwani and Arisanti Hospital on October 2018. A three mL of blood was collected and the phosphate level was measured with specthrofotometer. Results: Sixty seven of 100 samples was man with mean age was 52,52 (SD±12,811). The most cause of CKD was pyelonephritis chronic. The mean of hemodialysis duration was 44,59 (SD± 32,40). Level of the phosphate more than normal limit found as high as 69% of the samples. There was a correlation between age (p=0.001), gender (p=0.020) and phosphate level, but there was no correlation between IMT, HD duration and phosphate level, accounting for p=0.222 and p=0.264, respectively. Conclusion High finding of hyperphosphatemia that found in the study reveal the presentation of CKD-mineral and bone disorder in CKD patients. Correlation of age with higher phosphate level may relate with the deterioration of kidney function in elderly.

Keywords
CKD; phosphate level, hemodialysis

Topic
Biology

Link: https://ifory.id/abstract/TLG7AzgMaxcu

Corresponding Author
Wati Susilawati

Institutions
Universitas Garut

Abstract
SERVICE QUALITY FACTORS: THE EFFECT OF WEB NAVIGATION ON ONLINE TRANSFORTATION IN INDONESIA T Mulyana, W Susilawati, W Wufron, N Mardani Management Departement, Universitas Garut Jl. Raya samarang 52A, Garut, Indonesia E-mail: tatang.mulyana@uniga.ac.id Abstract. The purpose of this research to analyze the service quality of online transportation an area in Indonesia, seen from consumer perceptions, and map service quality attributes based on consumer perceptions. The research method used in this research is Service Quality Analysis (SERVQUAL) and Importance Performance Analysis (IPA). The population in this research is online transportation consumers, who have used a go ride service at least 1 time. The sampling used in this research was sampling quota of 200 respondents. The results of this research indicate that overall there is a gap between performance values with consumer expectations of -0.5, so it can be assumed that the service quality of Gojek in the region according to consumer perceptions is quite good. Based on the results of the mapping it was found that the factor of ease of web navigation became one of the factors of the services quality of online transportation. So that these factors must be a concern of the company.

Keywords
consumers, navigation website, service quality

Topic
Management Science

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

Corresponding Author
Mirsa Umiyati

Institutions
Universitas warmadewa

Abstract
The purpose of this study was to get one of the right time to trim the shoots and giving the urine more often given will be able to give effect to the growth and yield of melon plants both the best quality and quantity as well as the increasing income of melon farmers. This research is a factorial experiment, with a randomized block design (RCBD) basic design with 2 factors tried and carried out in a greenhouse from June to September 2018. In the first factor, shoot pruning consists of 3 levels: P 1 = pruning shoot 7 days, P 2 = pruning 14 days, P 3 = pruning buds 21 days. The second factor with 4 levels of giving rabbit urine: U 0 = without being given urine, U 1 = giving urine every 3 days, U 2 = giving urine once every 6 days, U 3 = giving urine once every 9 days. From the experiment there will be 12 combination treatments and will be repeated 3 times so that there are a total of 36 combination treatments. The data obtained were analyzed by analysis of variance and continued with a 5% BNT or Duncan distance test. The interaction (P x U) between setting the shoot pruning time (P) and giving rabbit (U) urine to the growth and yield of melon (Cucumis melo L.) plants on all influential variables was not significant (P≥0.05). Fruit weight per plant due to setting the shoot pruning time gave the highest weight obtained at P 1 of 1555.21 g which was not significant with P 2 having a weight of 1452.81 g and significantly different from P 3 which was 1412.34 g. The treatment of P 1 each increased by 7.05% and 10.12% against P 2 and P 3. The results of this study showed that the highest fruit weight was obtained when pruning 7 days after planting (P1) supported by 256 plant height, 75 cm, number of lateral shoots 16.92 pieces, number of leaves 80.42 strands, leaf area 14242.72 cm2, leaf wet weight 376.29 g, wet weight of stem and lateral shoots 190.22 g, root wet weight 19.89 g, leaf dry weight 133.03 g, root dry weight 15.36 g, fruit dry weight 298.03 g. Fruit weight per plant on U 1 urine administration with the interval of giving once every 3 days showed the highest value of 1568.88 g different not significant with U 2 and U 3 each of 1482.42 g 1474.36 g. U1 treatment when compared with U 0 without urine administration was significantly different with a value of 1368.17 g, an increase of 14.67%. The high weight of fruit treated urine administration time once every 3 days (U 1) supported by variable plant height 265.17 cm, number of lateral shoots 17.44 pieces, number of leaves 87.88 strands, leaf area 15,590.13 cm2, wet weight of leaves 399 11 g, the wet weight of the stem and lateral shoots 201.71 g, root wet weight 21.66 g, root dry weight 16.02 g, fruit dry weight 322.28 g in treatment U 1 and all had significant effect with maximum value.

Keywords
Pruning time, rabbit urine, melon plants

Topic
Chemistry

Link: https://ifory.id/abstract/C6KTc8zHeqFf

Corresponding Author
Anak Agung Ngurah Mayun Wirajaya

Institutions
a) Agrotechnology Study Program, Faculty of Agriculture-Warmadewa University
* Email: mawir61[at]yahoo.com

Abstract
The purpose of this study was to obtain the right time for pruning and best urine treatment intervals for the growth and yield of melon plants. This research is a factorial experiment, with the basic design of Randomized Block Design (RBD) with 2 factors. This experiment was carried out in a greenhouse from June to September 2018. The interaction between setting the pruning time (P) and giving rabbit urine (U) to the growth and yield of melon plants on all influential variables was not significant. The highest weight obtained from the weight of fruit per plant because the setting of shoot trimming time is given at P1 of 1,555.21 g or increased by 10.12% compared to the lowest yield at P3 which is 1412.34 g. Fruit weight per plant in U1 urine administration with a given interval of 3 days showed the highest value of 1568.88 g or increased by 14.67% compared to the lowest result at U0 which was 1368.17 g.

Keywords
Pruning time, rabbit urine, melon plants

Topic
Biology

Link: https://ifory.id/abstract/Bk7AzeDrYLMd

Corresponding Author
Aries Dwi Indriyanti

Institutions
Universitas Negeri Surabaya

Abstract
Underprivileged scholarships are assistance provided by the government or institutions to students from poor families. Scholarships can be given to all students at the education level from elementary school to higher education with certain conditions and criteria. However, in reality many scholarships are given that are not on target. This is because of the number of students who register as scholarship recipients. Therefore, it is necessary to have a decision support system in order to aid the selection process. This study aims to find appropriate system to aid the underprivilaged scholarship selection. This study proposed a system which was built using PHP for programming languages and using MySQL as its database using the Simple Additive Weighting (SAW) method. Data is taken from SMK Sultan Agung 1 Jombang. Data is then analyzed and tested using the Blackbox testing method. The results of the study prove that Simple Additive Weighting can be used as a support system to help implement students in prospective scholarship recipients.

Keywords
Decision Support System, Simple Additive Weighting, Scholarship

Topic
Computer Science

Link: https://ifory.id/abstract/rFdykvmJtXW3

Corresponding Author
Prana Dwija Iswara

Institutions
a) PGSD, Universitas Pendidikan Indonesia
Jalan Mayor Abdurahman No. 211, Sumedang, Indonesia
*iswara[at]upi.edu
b) Music Edication, Universitas Pendidikan Indonesia
Jalan Dr. Setiabudhi No. 229, Bandung, Indonesia
c) PGSD Penjas, Universitas Pendidikan Indonesia
Jalan Mayor Abdurahman No. 211, Sumedang, Indonesia

Abstract
Some of the Indonesian people who struck by the crisis of national character must get proper handling. Some of these national crises lead to acts of global terrorism. One effort to deal with the national character crisis, especially at the level of elementary school students, is to teach songs with national character. In the period of 2017 until the beginning of 2019 the learning of songs with national character was held as part of the national character campaign. The study found a number of simple computer technology instruments that can be used in learning songs in the classroom. Several technology package options can be used. In this study also found a number of procedures that must be prepared by teachers in learning songs with simple technology in class. However, if the teacher is not good enough in teaching learning material, those simple technology can become less effective.

Keywords
computer technology; national character building; song; lyrics; elementary school

Topic
Computer Science

Link: https://ifory.id/abstract/rxEM9WXButQL

Corresponding Author
Iwan Sugihartono

Institutions
1Program Magister Pendidikan Fisika, FMIPA, Universitas Negeri Jakarta, Jl. Rawamangun muka no. 01, Rawamangun, Jakarta Timur 13220, Indonesia
2Laboratorium kontrol, FMIPA, Universitas Negeri Jakarta, Jl. Rawamangun muka no. 01, Rawamangun, Jakarta Timur 13220, Indonesia
3Program Studi Fisika, FMIPA, Universitas Negeri Jakarta, Jl. Rawamangun muka no. 01, Rawamangun, Jakarta Timur 13220, Indonesia

Abstract
We have developed a theremin as musical instrument non-contact based on LDR using arduino uno as primary interface. The musical instrument system consist of one LDR, arduino uno rev3, buzzer, and LCD display. By adjusting the distance, the frequency will change and produce tones. Our demonstration confirmed that do(C6), re (D6), noodles (E6), fa (F6), sole (G6), la (A6), si (B6), do-(C7) have frequencies at 1046 Hz, 1174 Hz, 1318 Hz, 1396 Hz, 1567 Hz, 1760 Hz, 1975 Hz, 2093 Hz, respectively.

Keywords
Theremin, non-contact, LDR, frequency, tones

Topic
Electronics Engineering

Link: https://ifory.id/abstract/zRawXZtPBE9x

Corresponding Author
Muhammad Yusro

Institutions
Faculty of Engineering, Universitas Negeri Jakarta

Abstract
This study aims to make a detector for the nominal value and authenticity of money (rupiah currency). The working principle of this tool is as follows: UV LEDs function to provide lighting to objects (money). The light will circulate hidden colors in real money so that you can differentiate real money or money whose authenticity is doubtful. The White LED provides lighting for the object, then the light is received by the TCS 3200-DB color sensor to read its Red, Green, and Blue (RGB). Furthermore, the RGB value will be processed by Arduino Mega 2560 to be compared with the RGB values in the program. The mini DFPLayer functions to play sound according to the sound that has been recorded with the program. Testing the tool is done to determine the percentage of success of the tool in distinguishing between original money and the authenticity of money is doubtful. Testing of 7 (seven) nominal 2016 emission rupiah, namely Rp. 1,000 (80%), Rp. 2,000 (60%), Rp. 5,000 (100%), Rp. 10,000 (100%), Rp. 20,000 (80%), Rp. 50,000 (100%) and Rp. 100,000 (66%), so the average percentage of success of the tool is 83.71%.

Keywords
money detection; microcontroller; Arduino Mega 2560; color sensor

Topic
Electronics Engineering

Link: https://ifory.id/abstract/qAtV2g9UfQbr

Corresponding Author
Diah Ambarwulan

Institutions
a) Department of Physics Education, Faculty of Mathematics and Sciences, Universitas Negeri Jakarta, Jakarta 13220, Indonesia
*dmuliyati[at]unj.ac.id
b) Department of Management, Faculty of Economics, Universitas Negeri Jakarta, Jakarta 13220, Indonesia

Abstract
The shallow-water equation has an important role in studying the characteristics of ocean waves. These characteristics were influenced by the depth of the sea. This study simulates ocean waves around the coastal areas with different slopes. The simulation system is a 2-dimensional limited boundary, built using Gmsh software. The calculation uses the Quickersim toolbox for the Matlab environment. The outputs generated from these simulations are the position and speed at any time in 2-dimensions. The simulations results show the 2-dimensional velocity pattern of each waves section. These result can be used in the future research to learn the implementation in tsunami waves.

Keywords
Ocean waves simulation, shallow-water equation, Quickersim Toolbox

Topic
Computer Science

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

Corresponding Author
Rachmat Jaenal Abidin

Institutions
(a) Department of Informatics, UIN Sunan Gunung Djati Bandung, Indonesia

Abstract
Sleep disorders is a disorder experienced by a person when the REM and NREM cycle don-t work normally. Prolonged sleep disorders can cause a variety of bad conditions such as depression, fatigue, reduce work, performance and endurance. It quickly offended till affect to our own safety. The latest study in 2018 conducted by Dr. Welly Sondakh, MPH in Jakarta revealed that there were 10% of people with insomnia from the Indonesian population or around 28 million people. The low public awareness of sleep disorders causes them to need alternative media, namely an expert system to diagnose sleep disorders. Expert system is a system that uses the knowledge of an expert to solve a problem in a particular field where the system is not limited by time and can be used by many people. The method used in this system is Certainty Factor as an inference engine to determine the results of the diagnosis based on the symptoms determined. The calculation of this method combines the MB (measure of increased belief) and MD (measure of increased disbelief) values obtained from experts. From 50 test data, 45 data were obtained so that the accuracy level reached 90%. This shows that the expert system of diagnosing sleep disorders is suitable for early diagnosis of sleep disorders

Keywords
Expert System, Sleep Disorder, Certainty Factor

Topic
Computer Science

Link: https://ifory.id/abstract/wb3dNREBvDWZ

Corresponding Author
Haris Singgih Darmawan

Institutions
a) Department of Electrical and Information Technology Engineering, Faculty of Engineering, Gadjah Mada University
Jalan Grafika 2 Yogyakarta 55281 INDONESIA

Abstract
The problem of small signal stability is one of the main problems in the current power system because the purpose of operating the system is close to the limit. Small signal stability is important because small disturbances in the form of non-dampened electromechanical oscillations have limited the power flow limit in a steady state, so the oscillation will affect the operating system in a security and quality review. The entry of renewable energy in the Sulawesi interconnection system certainly has an impact on system stability and the emergence of electromechanical oscillations. An estimated 75 MW of power will come from the PLTB that will be built in Sidrap and 62.5 MW in Jeneponto. This study aims to analyze small signal stability due to the development of EBT generators on the Sulawesi interconnection system through eigenvalue characteristics and participation factors. The PLTB that will be integrated in the Sulawesi system certainly affects power flow which has an impact on small signal stability. From the above explanation, it is considered necessary to conduct research on the analysis of the stability of small signals before and after the integrated power plant in the Sulawesi electricity system.

Keywords
Small signal stability, Renewable Energy, Eigenvalue.

Topic
Electrical Engineering

Link: https://ifory.id/abstract/PeKUXF6JNy7j

Corresponding Author
Wildan Arasid

Institutions
Pendidikan Teknik Elektro
Universitas Pendidikan Indonesia
Bandung, Indonesia
wildanarrasyid55[at]gmail.com

Abstract
By the rapid development of technology, automation systems are widely used. The usage of automation system in house is to create comfort, safety and also energy savings by controlling home appliances according to the desired distance. This smart home prototype based on internet is created to apply the smart home system working automatically and controlled manually through internet network by using ESP8266-12e module. This system controls lamp and solenoid valve as a tap water. The used method in this study is an experimental method consists of field study and problem identification, literature study, expert consulting, design and manufacturing, field testing, results analysis, create reports and journal. The testing result shows that the system function properly and automatically controlled through the website.

Keywords
Smart Home, ESP8266, LDR Sensor, Ultrasonic Sensor

Topic
Electronics Engineering

Link: https://ifory.id/abstract/nqMut9hVgjZH

Corresponding Author
jamilah jamilah

Institutions
Institut Pendidikan Indonesia Garut

Abstract
This study is inspired by the increasing number of smartphone users. There are three objectives of this study, such as: to reveal the smartphone utilization, to describe students freedom of speech on social media such as facebook, to discover the impact of smartphone utilization towards students freedom of speech on facebook. The study employed descriptive method with quantitative approach. As many as 100 students out of 10 study programs were selected randomly as the sample of this study. The results of the study revealed that: Smartphone utilization among university students was not only intended for learning activity but also for non-learning activity, students freedom of speech on facebook was considered as positive aspiration, and smartphone was significantly influential on how students freedom of speech was expressed on facebook. To conclude, smartphone is a media which can be utilized by the students to express their point of view on facebook. The implication towards the findings of the study is that the government as the policy maker is expected to control and enforce Electronic Information and Transactions Law (ITE Law), in order that the freedom of speech does not violate the applicable law.

Keywords
Smartphone, Freedom of Speech, Facebook

Topic
Computer and Communication Engineering

Link: https://ifory.id/abstract/Bd7E8TyjWnaf

Corresponding Author
Sari Sari

Institutions
1,2,3,4 Prodi Pendidikan Kimia Universitas Islam Negeri Sunan Gunung Djati Jl. A.H. Nasution No. 105, Bandung 40614, Indonesia
5 Prodi Pendidikan Agama Islam Universitas Islam Negeri Sunan Gunung Djati Jl. A.H. Nasution No. 105, Bandung 40614, Indonesia

Abstract
The purpose of this study is to determine alkali metal content by means of flame using smartphone application with experiment. Method stages are performed by making a standard solution and test solution first. Standard solution for determining density line equations to vector norm value. While the test solution is to determine the known concentration of NaCl from the line equations. The standard solutions of each RGB value is tested to get an equation with the value gradient must be close to or equal to 1. The analysis shows that the use values of RGB obtained from a captured image of the video is the color intensity resulting from the flame sodium metal. Level of the standard solution 1 shows result that is quite accurate with test solution levels of 0.0313 g/mL. Likewise with standard solution 2, the result is 0.0063 g/mL and standard solution 3 is 0.00032 g/mL. The value of gradient of the standard solutions must have a value close to or equal to 1. This is because the value of gradient affects the concentration results obtained. If gradient has a value that is very close to 1, an accurate result will be obtained.

Keywords
smartphone, Alkali, Flame tests, RGB Color Detector

Topic
Chemistry

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

Corresponding Author
HENDRA PRADIBTA

Institutions
Information Technology Department
State Polytechnic of Malang

Abstract
Tourism in Malang City is one sector that contributes significantly to efforts to increase regional income. Efforts such as Strategic City Branding (Beautiful Malang) were carried out to promote tourism in Malang City. Tourism potential in Malang City is very diverse, ranging from natural tourism to culinary tourism. However, the distribution of information about these attractions has not been maximized, because it is still done manually, by looking at the signpost boards which are sometimes unclear, asking questions to the tour guide or by coming directly to Malang Tourist Information Center. This method is not sufficient, because of limited access time and less flexibility for tourists. Lack of information regarding the distribution of tourist attractions can be minimized by using GIS (Geographic Information System) technology. This technology allows tourists to be able to find out where they are at the moment and the closest destinations around them. By utilizing this Geographic Information System, potential tourist attractions can be mapped to be more maximal, so that one can find a place more efficiently and does not take long. To be more attractive, guidance is needed in the form of digital applications and can utilize Augmented Reality (AR) technology. In this case, this technology can be used to display information content in public places. The use of this technology is expected to be something innovative to advance tourism in Malang City.

Keywords
Tourism, Hybrid Technology, Augmented reality, GIS

Topic
Computer Science

Link: https://ifory.id/abstract/AWqxw4vU6PBf

Corresponding Author
Dwi Hadidjaja

Institutions
1,2 Electrical Engineering, Muhammadiyah University Sidoarjo

Abstract
Abstract. By implementing SMS on scheduling bird feed with automation, it makes it easier for poultry farmers to feed birds. Scheduling bird feed can be done continuously to avoid excessive amounts of feed. This application works according to the time set by the user. This application uses a servo motor to open and close the feed valve, the microcontroller system as the main controller, SIM 800L as the information provider in the form of SMS, and RTC as a time scheduling system. In scheduling bird feed can be done per second. There is a GSM shield notification to the user when the system is running. The average provider or GSM is caused by signal factors during the trial, and depending on bad weather or indeed the signal tends to be difficult. Servo motor process with its own open angle between 0°-90° with a delay time of 50 seconds. For the 800L SIM it takes a voltage between 3.8 - 3.9 volts.

Keywords
GSM, Microcontroller, Servo Motor, SIM800L

Topic
Electrical Engineering

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

Corresponding Author
Samadi Samadi

Institutions
Universitas Negeri Jakarta
*samadi[at]unj.ac.id

Abstract
This study aims to obtain empirical data on the model of social engineering of elderly fishermen in improving the quality of local life. The study used qualitative methods, from May to November 2017 in Pantai Bahagia Village, Muara Gembong District, Bekasi Regency, West Java. The results of the study show that: (1) The various strategies adopted by elderly fishermen in fulfilling their daily needs and their application in daily life are highly dependent on various socio-cultural factors and the possible strategies that can be developed. The main strategies carried out in the elderly at the research site include: intensification strategies, job diversification strategies, and strategies for utilizing social relations. (2) An intensification strategy is a pattern of operating a business tool (boat are used as business capital) by involving boys. (3) Diversification strategy is a pattern of additional work besides being a daily fisherman, such as working as a fish seller outside the village, a camera repairman, or a fisherman worker. And (4) The strategy of utilizing social relations, is a pattern that is not directly related to service, but still has influence in the social and cultural fields such as social works, as well as guardians of the tomb.

Keywords
Social Engineering Model, Increasing Local Life, Elderly Fishermen, Muara Gembong Bekasi.

Topic
Environmental Engineering

Link: https://ifory.id/abstract/paFPGve6nKhL

Corresponding Author
Yana Aditia Gerhana

Institutions
a) Department of Informatics, UIN Sunan Gunung Djati Bandung
b) School of Graduate Studies, Asia e University Malaysia

Abstract
In the digital era, social media has become an integral part of life. Social media is able to change the way people communicate, interact, collaborate and share knowledge. Today Social media is one of the main platforms for knowledge resources, both for individuals, groups and even organizations. Various techniques are used to utilize knowledge from social media, one of which is through social media data analytics. Current research trends are mostly discussing about the use of social media as a source of knowledge, including research in the field of knowledge management. The purpose of this paper is to provide a better understanding and detailed review of social media research in knowledge management. We carry out a systematic review approach to collect, analyze, and synthesize data on the accuracy and value of previous articles focused on this field of research, addressing various topics, and published in digital databases between 2013 and 2019. The Systematic Literature Review (SLR) method is used to collect and review studies by following the prescribed review procedures. We identified 78 scientific publications that present research on social media and knowledge management systems. Systematic reviews show that social media data analytics has been widely used in various fields, and has become an important part of knowledge management, but not many discuss how knowledge conversion models in the context of the knowledge management system. This discussion offers how to develop a knowledge management system in the behavior of social media.

Keywords
Social media analytics, Knowledge Management System, SLR.

Topic
Computer Science

Link: https://ifory.id/abstract/PVNzAMv2qgBy

Corresponding Author
Nizar Alam Hamdani

Institutions
Universitas Garut, Universitas Garut; Universitas Pasundan

Abstract
In Society 5.0, financial capital is no longer the key, but data that are interconnected with each other. The Internet of things will be a new normal, dedicated to unlock human potentials. The purpose of this study is to analyze the feasibilities and challenges of the implementation of fintech in small and medium industries. To this end, a survey was conducted on a sample of 60 small and medium industries. It was revealed that the implementation of fintech in small and medium industries did not seem ready to be achieved due to the limitations in technology infrastructure, data and information, human resources and policy. Therefore, improvement to these factors should be made to realize the human-centered and technology-based society.

Keywords
Society 5.0; Financial Technology; SMEs

Topic
Computer and Communication Engineering

Link: https://ifory.id/abstract/BpU9Nac7KAtb

Corresponding Author
Meme Susilowati

Institutions
(a) Program Studi Sistem Informasi, Fakultas Sains dan Teknologi, Universitas Ma Chung, Villa Puncak Tidar Blok N-1, Malang Jawa Timur
(b) Program Studi Teknik Informatika, Fakultas Sains dan Teknologi, Universitas Kanjuruan Malang, Jl. S. Supriadi, No. 48 Malang Jawa Timur

Abstract
The management citizen database is Improper and not up-to-date will results decisions that are not strategic for the village development process. Inappropriate citizen data also results in long-term ineffective local government planning processes. Such as the problem of forecasting or predicting the level of growth of citizens as well as the need for development services which are part of the medium-term long-term plans of local governments. Because it requires a citizen database information system. In connection with the needs of citizen database information systems, this study provides a solution of analyzing documents, namely the requirement specification software for citizen database information systems using the ISO / IEC / IEEE 29148 edition of 2011. The study was conducted with case studies of 6781 management data of residents of the village of Sumbersekar, Malang Regency, East Java. The method to execute the research consisted of data gathering stages, data flow and decision analysis, and the last is create software requirement specification. the specific requirements of the SRS documents ISO / IEC / IEEE 29148 2011 edition are external interfaces, functions, usabilit requirements, performance requirements, logical database requirements, design contraints, software system attributes, supporting information and verification.

Keywords
local governance, software requirement specifications, database information system, sumbersekar, ISO / IEC / IEEE 29148-2011

Topic
Information Engineering

Link: https://ifory.id/abstract/ahk3ZAqWdBRm

Corresponding Author
Irika Widiasanti

Institutions
(a) Faculty of Engineering, Universitas Negeri Jakarta
Jalan Rawamangun Muka, Jakarta 13220, Indonesia

Abstract
The purpose of this study was to determine the physical properties and mechanical properties of soil. The study used the experimental method. Soil samples were taken from Cikarang Baru area with field investigations through sondir, boring and SPT tests. Data obtained in the form of disturbed and undisturbed soil. Furthermore, the soil is tested in the laboratory which includes physical testing and mechanical testing. Testing soil samples through laboratory procedures in accordance with the ASTM standard (America Society for Testing and Materials). Based on the test, it was found that soil samples have the characteristics of being of medium to low type while the Unified Soil Classification System (USCS) is fine grain soil, high plasticity and cohesive of clay, and high expansive soils.

Keywords
expansive soils

Topic
Civil Engineering

Link: https://ifory.id/abstract/QcvPCm3zugeV