Indonesia Conference Directory

Corresponding Author
Dhini Annisa Rahmasari Kanto

Institutions
a) Department of Chemistry, Faculty of Mathematics and Natural Sciences, Garut University
Jalan Jati No. 42B, Garut 44151, Indonesia
*dhini.annisakanto[at]gmail.com
b) Department of Pharmacy, Faculty of Mathematics and Natural Sciences, Garut University
Jalan Jati No. 42B, Garut 44151, Indonesia

Abstract
Syzygium is a genus belongs to Myrtaceae. One species of the genus is cashew rose (Syzygium jambos (L.) Alston) which contains secondary metabolites, such as flavonoids, tannins, steroids/terpenoids, alkaloids and saponins. This study aimed to find the content of these secondary metabolites using thin layer chromatography (TLC) and its antioxidant activity. The simplicia of cashew rose leaves was extracted by maceration using methanol as a solvent for 64 hours. This results in methanolic extract of cashew rose leaves. The resulted chromatogram using n-hexane and ethyl acetate eluent showed that the methanolic extract of leaves cashew rose has at least five compounds with retention value (Rf) consecutively were 0.32, 0.36, 0.68, 0.72, and 0.84. The stains could be seen in UV light 356 nm, but not in UV light 254 nm. It can be concluded that these compounds were classified as nonfenolic compound. The antioxidant test of methanolic extract of cashew rose leaves showed a very strong antioxidant activity with IC50 value of 13,554 ug/mL.

Keywords
Syzygium jambos (L.) Alston; chromatogram; DPPH; antioxidant; IC50

Topic
Chemistry

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

Corresponding Author
Demmy Dharma Bhakti

Institutions
(1*) Department of information system, Institut Pendidikan Indonesia, Jl. Pahlawan No.32, Garut 44151, Indonesia
(2) Department of information technology education, Institut Pendidikan Indonesia, Jl. Pahlawan No.32, Garut 44151, Indonesia
(3) Department of information system, Institut Pendidikan Indonesia, Jl. Pahlawan No.32, Garut 44151, Indonesia

soraturaes[at]gmail.com

Abstract
Communication is difficult for children with hearing impairments due to the limitations of their hearing senses. In addition to communicating using natural cues they can also use the Indonesian Language System Dictionary (Dictionary SIBI) published by the Ministry of Education in the form of print. Dictionary Electronic sign language is starting to be used a lot, of course electronic dictionaries are more effective and flexible compared to dictionaries in general (print). A more effective electronic dictionary is used in searching for the signals sought and because they are efficient and easy to use. This journal discusses how to build / design the design of an electronic sign language dictionary application for deaf children.

Keywords
Communication, Deaf Children, Indonesian Language System Dictionary (SIBI)

Topic
Computer Science

Link: https://ifory.id/abstract/aZvUxWbQtL9Y

Corresponding Author
Demmy Dharma Bhakti

Institutions
(1.1*) Department of information system, Institut Pendidikan Indonesia, Jl. Pahlawan No.32, Garut 44151, Indonesia
(1.2) Department of physics education, Institut Pendidikan Indonesia, Jl. Pahlawan No.32, Garut 44151, Indonesia
(1.3) Department of information technology education, Institut Pendidikan Indonesia, Jl. Pahlawan No.32, Garut 44151, Indonesia

soraturaes[at]gmail.com
(2) Department of information system, Institut Pendidikan Indonesia, Jl. Pahlawan No.32, Garut 44151, Indonesia
(3) Department of information system, Institut Pendidikan Indonesia, Jl. Pahlawan No.32, Garut 44151, Indonesia

Abstract
Students find physics difficult, because they have to contend with different representations such as experiments, formulas and calculations, graphs, and conceptual explanation at the same time (angell, Guttersrud, Henriksen, and Isnes : 2004). As far as we know that physics experiments wich conducted in well-equipped laboratories, improve students science process skills (Hirca:2012). It is hard to imagine learning to do science, or learning about science, without doing laboratory or fieldwork (Trumper:2003). But many schools in various part of the world have very poor or no laboratories, so the teachers have to use their own equipment and replace the students experimental work with simple demonstration experiments (Ozvoldova, Spilakova, Tkac). The purpose of this study was to create physics learning media for archimedes law using simulation to cover the lack of the availability of laboratories and physics paracticum tools. CSUQ is used to test usability of the simulation.

Keywords
simulation, physics learning media, CSUQ.

Topic
Computer Science

Link: https://ifory.id/abstract/W8cbDGUnKLh9

Corresponding Author
Demmy Dharma Bhakti

Institutions
(1.1) Department of information system, Institut Pendidikan Indonesia, Jl. Pahlawan No.32, Garut 44151, Indonesia
(1.2*) Department of information technology education, Institut Pendidikan Indonesia, Jl. Pahlawan No.32, Garut 44151, Indonesia
(2) Department of information system, Institut Pendidikan Indonesia, Jl. Pahlawan No.32, Garut 44151, Indonesia

soraturaes[at]gmail.com

Abstract
This Ruangguru application study aims to determine the relevance of application functions based on the principles and paradigms of Human and computer Interaction (HCI). In this study, the aspects evaluated included aspects of human, technology, usability, and ergonomics. The interest in studying the Ruangguru application is based on several sources stating that Ruangguru is believed to be the best education platform. So from that sentences, it was examined several aspects to determine the extent of the relationship between the Ruangguru application and HCI principle. After the study was conducted, the Ruangguru application was assessed to have fulfilled these aspects. So its no wonder the Ruangguru application is used as an online learning center among Indonesian students.

Keywords
Ruangguru application, HCI

Topic
Computer Science

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

Corresponding Author
Aika Latifah Alawiyah

Institutions
a). Program Studi Kimia, Fakultas MIPA, Universitas Garut
Jl. Jati 42B, Tarogong Garut, Indonesia 55141
*aikalatifah[at]uniga.co.id
b). Program Studi Farmasi, Fakultas MIPA, Universitas Garut
Jl. Jati 42B, Tarogong Garut, Indonesia 55141
c). Program Studi Kimia, Fakultas MIPA, Universitas Pendidikan Indonesia
Jl. Dr. Setiabudi No. 229, Bandung, Indonesia 40153

Abstract
Secondary metabolites of Syzygium aromaticum (L.) leaves essensial oil have been identified as antioxidants. This study aimed to determine the volatile compounds of Syzygium aromaticum (L.) leaves essential oil and antioxidant activity. Fresh Syzygium aromaticum (L.) leaves were extracted by steam distillation. Identification of volatile compounds was done by Gas Chromatography Mass Spectroscopy (GC-MS). DPPH assay was used to evaluated an antioxidant activity of samples. Volatile compounds of Syzygium aromaticum (L.) leaves essential oil resulted 15 compounds. The resulted of DPPH assay showed very strong antioxidant.

Keywords
Antioxidants, Clove, Essential oil,

Topic
Chemistry

Link: https://ifory.id/abstract/rZeaT7UEP8t9

Corresponding Author
Sherly Novia Sari

Institutions
Research Center of Physics, Indonesian Institute of Indonesia

Abstract
Low cost and very simple activation method (KOH as activating agent) is used for the synthesis of activated carbon derived from the biomass manihot esculenta crantz (mocaf). The mocaf derived activated carbon as electrode material in supercapacitor and characterized by SEM for to analyse the morphology, Brunauer-Emmet-Teller to know the surface area and to measure the electrochemical performance characterized by Cyclic voltammetry, Galvanostatic charge-discharge and Electrochemical impendance spectroscopy. Electrochemical studies indicate that the mocaf delivers the maximum specific capacitance of (36 F/g) at scan rate (5 mV/s) in aqueous electrolyte (1 M LiPF6) for (2.0 V) operating voltage. The electrodes from mocaf exhibits good rate capability with an excellent charging/ discharging cycle stability in aqueous electrolyte (1 M LiPF6) during 10.000 cycles. The results indicate that mocaf shows good electrochemical properties to be used for energy storage application.

Keywords
mocaf, supercapacitor, energy storage, biomass, low cost

Topic
Material Engineering

Link: https://ifory.id/abstract/rFmLqDuVR3Qc

Corresponding Author
Muhammad Rikza Nashrulloh

Institutions
Department of Informatics Engineering
Sekolah Tinggi Teknologi Garut

Abstract
Although franchise considered as a business system that has many features, that does not mean this business concept does not have weaknesses. Indeed, its been hundreds of years the format of this business is running. Even today the franchise business is getting its place as a proven business format and successfully delivering thousands of business brands across various continents and times. If the franchisor is less selective in choosing a franchisee, they may damage the franchisors image and business brand as a whole. The reason is if one franchisee does not comply with the operational standards provided by the franchisor then results in customer disappointment, it is not impossible that this customer will perceive all other outlets as bad. Using an innovation assimilation strategy framework, this paper describes how franchise organization used its implementation of a Smart Dashboard System to improve performance, allows franchisors to keep a handle on their franchise accounts and put it on a path towards digital leadership.

Keywords
Digital Leadership, Smart Dashboard System, Franchise, Design

Topic
Information Engineering

Link: https://ifory.id/abstract/mcMdzgVpUn7R

Corresponding Author
Nurul Auliasari

Institutions
a) Program Studi Farmasi, Fakultas Matematika dan Ilmu Pengetahuan Alam (FMIPA), Universitas Garut, Jl. Raya Samarang No. 52A, Garut 44151, Indonesia
*nurul[at]uniga.ac.id
b) Lembaga Farmasi Direktorat Kesehatan Angkatan Darat, Jl. Gudang Utara No. 26, Merdeka, Sumur Bandung, Kota Bandung 40113, Jawa Barat, Indonesia

Abstract
Sago is a staple food for most of the world population, its use is not only used in food products but also used in pharmaceutical products. Sago starch can be used as a binding material on tablets. This study aimed to develop formulation and evaluation of ibuprofen tablets using sago (Metroxylon sagu Rottb.) starch as a binder in making ibuprofen tablet preparations. Tablets made using wet granulation method with sago starch as a binder at various concentration. The evaluation includes of the granules and tablets. The result from dissolution test of ibuprofen tablets showed that the highest dissolved percentage was obtained in formula 1 compared to formulas 2 and 3. The results showed that sago starch could be used as binders on tablets and fulfilled the requirements on the evaluation of the granules and tablets.

Keywords
Ibuprofen; Metroxylon sagu Rottb; Binder; Tablets

Topic
Pharmacology

Link: https://ifory.id/abstract/uHJtqT6Rh4f2

Corresponding Author
Mulyadi Bin Sati"i Ramikan

Institutions
(1,3,4) Dept. of Mechanical Engineering, Universitas Muhammadiyah Sidoarjo
(2) Mechanical Engineering Laboratory, Universitas Muhammadiyah Sidoarjo
Jalan Raya Gelam 250 Candi, Sidoarjo 61271, Indonesia
*mulyadi[at]umsida.ac.id

Abstract
The CNC milling machining process is a very important process in manufacturing products because it affects the profitability of the production process. CAD / CAM programming software tools speed up the process and predict production process time. This study uses CAD / CAM simulation of HSM operations and uses the Taguchi method which is a method that can optimize process variables to get a good response. Process variables chosen are Speed, feed rate, depth of cut, step over, stay on surface and radius link. The type of tool used is an endmill with a diameter of 20 mm SECO Jabro-Solid-JS554 standard. The results of the study stated that the HSM machining simulation process that had a greater influence on machining time was feeding 680 mm / minute and 5 mm depth of cut. The experimental results confirm the ideal time produced is 34.25 minutes.

Keywords
CNC milling, CAD / CAM, feed rate, depth of cut, Taguchi method, HSM

Topic
Mechanical Engineering

Link: https://ifory.id/abstract/DmaFnxwGXvy7

Corresponding Author
Agus Setyo Budi

Institutions
aDepartment of Physics, Universitas Negeri Jakarta
Jl. Pemuda 10, Rawamangaun, Jakarta 13220, Indonesia
bDepartment of Physics Education, Universitas Negeri Jakarta
Jl. Pemuda 10, Rawamangaun, Jakarta 13220, Indonesia

Abstract
In this research, we investigate the mechanical behaviour of zinc sodium phosphate glass system with the various concentration of chromium oxide doped. The glass system was synthesized using the melt quenching technique. The concentration of chromium oxide varying from 0.5% to 2.5%. Longitudinal and shear ultrasonic velocities were measured in different compositions of the glass system at temperature range between 270 K and 323 K. From the transit time data and density, we found that all the mechanical behaviour for these glasses decrease as the Cr2O3 content increase, which indicates a weakening of the binding energy in the network.

Keywords
Chromium oxide, Ultrasonic velocities, zinc sodium phosphate glass

Topic
Material Science

Link: https://ifory.id/abstract/M9zRQV2wd4XT

Corresponding Author
Elmiawati Latifah

Institutions
(a*), (b) Department Pharmacy, Faculty of Health Sciences, University of Muhammadiyah Magelang

(c) Department Elementary School Teacher Education, University of Muhammadiyah Magelang

Abstract
Diabetes mellitus (DM) is a group of diseases characterized by high glucose levels in the blood resulting from a failure in insulin production or insulin action, or both. The specialty of Acanthus ilicifolius compared with other species when used for antidiabetic drugs is A. ilicifolius contains other secondary metabolites that are also good for health. This study aims to determine the effect of Jeruju leaf extract (A. illficolius) on the decrease of fasting blood glucose levels of rats and to know the most effective dose of A. ilcifolius extract on the reduction of fasting blood glucose levels of rats.This type of research is an experimental study of biomedical research design. The stages of this study consisted of sample preparation, identification of A. ilcifolius plant, leaf extraction of A. ilcifolius, qualitative analysis of saponin and tannin using thin layer chromatography method. Ethanol extract of A. ilcifolius with various doses, antidiabetic test in rats induced streptozotocin with categorized 15 animal samples into two control groups and three treatment groups and measured blood glucose level, followed by data analysis using ANOVA.The lowest activity occurred in negative control group, increased at dose 500 mg/kg, positive control and dose 250 mg/kg while the highest occurred in dose group 125 mg/kg. The result of statistic test with the parameter of decrease of fasting blood glucose level of the male rat of Wistar strain, in a group of jeruju leaf extract with dose 125 mg/kg and 250 mg/kg showed the significantly different result with a negative control group. Jeruju leaf extract with dose 125 mg/kg and 250 mg/kg have antidiabetic activity.

Keywords
Extract, Jeruju Leaf, Antidiabetic

Topic
Pharmacology

Link: https://ifory.id/abstract/rNBc4bgnKjAt

Corresponding Author
irsyad nugraha

Institutions
Institut Pendidikan Indonesia

Abstract
Abstract EFL learners tend to ignore the importance of understanding English phonetics in spite of its significance in language acquisition process. The failure of using and understanding English phonetics leads to mispronunciation issues which in turn impede both oral and written communication. Concerned with this issue, the research developed the use of augmented reality (AR) technology to facilitate English phonetics learning processes. The technology combined virtual objects and video clips in more attractive and interactive learning environment. This study described the steps and procedures of developing augmented reality as English Phonetic learning media and disclosed how the students utilized this media in their learning processes.

Keywords
Designing Augmented Reality, Phonetics, Education Regulation, and Government objectives

Topic
Computer Science

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

Corresponding Author
Elmiawati Latifah

Institutions
(a) Doctoral Program in Pharmaceutical Science, Faculty of Pharmacy, Universitas Gadjah Mada, Yogyakarta
(a) Department of Pharmacy, Faculty of Health Science, Universitas Muhammadiyah Magelang, Magelang
(b)Department of Pharmaceutics, Faculty of Pharmacy, Universitas Gadjah Mada, Yogyakarta
(c)Department of Pharmacology and Therapeutics, Faculty of Medicine, Universitas Gadjah Mada, Yogyakarta

Abstract
Drugs are vital to saving and improving public health. However, medicines are often not available at the facility because stocks run out or in particular, pharmaceuticals are not available due to a shortage of supplies. Implementation of pharmacy services should ensure safe, quality, usable and affordable availability drug. A systematic review was conducted to identify related studies. Electronic databases used to identify relevant studies are, ScienceDirect, Plos, PubMed and Google Scholar. This study is limited to English and publications from 2007 to 2017. The electronic database search earned 33 articles while only six studies met the criteria for review. There is the relatively low availability of drugs in some developing countries and the average availability of generic drugs is better than Innovator Brand drugs, especially in the public sector. Most of the factors that may affect drug availability are related to government policies to improve drug access and lower prices so that national drug policy review in each country is required. Overall, the method used to measure the availability of drugs using a refer ence method used by WHO Health Action International. The availability of drugs in low, lower and upper middle countries still need to be improved by increasing drug access and enhancing prices by using appropriate government policies. The WHO HAI method is effectively used to measure the availability of drugs by using the core drug and supplementary drug references by the established reference.

Keywords
Drug Availability, Overview, Influencing Factors, Several Low, Lower and Upper-Middle Countries.

Topic
Management Science

Link: https://ifory.id/abstract/Fg9uERwfcvJX

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
ida farida

Institutions
Sekolah Tinggi Teknologi Garut
Program Studi Teknik Sipil
Jl. Mayor Syamsu No. 1 Jayaraga Tarogong Kidul Garut Jawa Barat Indonesia

Abstract
Regional development is closely related to the provision of infrastructure, namely the road network with the hope of creating a positive impact. Roads as a means of connecting, open access, play a role in the smooth movement of people and goods and have the potential to increase economic activity. The purpose of study is to analyze the economic feasibility of road construction. The method used refers to Pd.T-15-2005-B. Components analyzed the economic feasibility aspects of road construction are based on differences in vehicle operating costs and time values arising from differences in transportation costs on the new road and existing road BKBOK. The results of the study took the form of specific recommendations and were a solution to the need for work to be carried out by examining the extent to which the level of feasibility, especially from the economic and financial aspects. The economic indicators used are Net Present Value, Internal Rate of Return, and Benefit-Cost Ratio. The indicator provides a scale that compares the benefits and costs of each alternative proposed, specifically each indicator has different characteristics. In general, all of these indicators need to be examined to more clearly describe economic events during the planning period.

Keywords
BOK, BKBOK, costs, economic feasibility, road construction, transportation

Topic
Civil Engineering

Link: https://ifory.id/abstract/aPMYDk2HTcWn

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
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 Chemistry, Faculty of Mathematics and Sciences, Universitas Negeri Jakarta, Jakarta 13220, Indonesia.
c) Department of Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung,
Jl. Ganesa No. 10, Bandung 40132, West Java, Indonesia.

Abstract
Granular particles have wide applications in various industrial fields, one of which is the beauty industry. One important part of this industry is the character of powder-size interactions with porous skin surfaces. This interaction can be modeled by the interaction of granular particles with a porous surface. Simulation that has been done can visualize the process of granular attachment on a horizontal porous surface. This simulation is 3-dimensional visualization using uFlex assets on unity software. The surface system is arranged in 3 pore sizes. Each surface is tested using 5 granular particle sizes. The results showed that the particles entering the porous surface system were influenced by the falling speed, porous hole diameter, coefficient of granular restitution and collision between granular particles.

Keywords
granular particle, porous surfaces, uflex unity assets

Topic
Computer Science

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

Corresponding Author
Andri Ikhwana

Institutions
a) Department of Industrial Engineering, b) Department of Informatics Engineering
Sekolah Tinggi Teknologi Garut

Abstract
The sustainability of business activity is determined by the existence of all elements involved in business activity. Alignment of each component involved in business activities can be determined by identifying supporting factors based on activities in each business chain that occurs. This study aims to determine the supporting factors for the optimality of supply chain performance of brown sugar business activities using the supply chain management approach and supported by the analytical hierarchy process method in determining criteria that support brown sugar business activities. Based on the results of research on the supply chain of brown sugar business activities, to support the sustainability and optimality of supply chain performance the brown sugar business on the elements involved in the brown sugar business consists of several factors including product quality, the cost of purchasing brown sugar raw materials, and accuracy and the suitability of the number of shipments that are in accordance with the request.

Keywords
supply chain management, decision analysis, analytical hierarchy process

Topic
Industry Engineering

Link: https://ifory.id/abstract/TWQfzkEUcaA8

Corresponding Author
Maisevli Harika

Institutions
Department of Computer and Informatics Engineering, Politeknik Negeri Bandung, Indonesia
2Interdisciplinary Program of Information Security, Graduate School PKNU
Department of IT Convergence and Application Engineering
Pukyong National University, Busan, South Korea,
2Department of Informatics, UIN Sunan Gunung Djati Bandung, Indonesia

Abstract
Medical record (MedRec) of the patient is derived from several healthcare providers i.e. hospital, the national provider, and laboratories which contains personally identifiable information test yet referred to therapeutic procedures and medications of the patient. MedRec has been compiled and maintained by several providers thus resulting in separated and disseminated the data among the parties. Mostly, the MedRecs are stored in providers database and the patients have no control to manage and access their data. Hence, in this paper, we propose a conceptual model for managing the data of medical record using blockchain technology in the peer-to-peer network with several protocols are embedded in the system. The proposed model aims to facilitate the patients in order to manage their data from various providers into a single view. Blockchain offers the promise of an immutable, single source of truth from multiple sources and facilitates a trust as well as validates an identity without the third-party involvement.

Keywords
blockchain, decentralized, medical record, peer-to peer network

Topic
Computer Science

Link: https://ifory.id/abstract/u9Ccp3fZTMmj

Corresponding Author
Arasy Fahruddin

Institutions
a) Mechanical Engineering Department, Universitas Muhammadiyah Sidoarjo, Jl. Raya Gelam No.250, 61271, Sidoarjo, Indonesia
*arasy.fahruddin[at]umsida.ac.id

Abstract
The Indonesian region has abundant alternative energy sources that can be used to meet electrical energy needs. One potential alternative energy source is water energy that can be converted into electrical energy with a water turbine. Water turbines are generally one stage, whereas water energy on the output side is still quite large. In this study, experiments were made using a two-stage micro water turbine model with blade angle variations on the second stage turbine. The type of turbine used in this study is a crossflow turbine with a vertical shaft. The results show that the 45 degree blade angle on the second stage turbine can increase the second stage turbine rotational speed, and also increase the first stage turbine rotational speed. So that the total power of the turbine increases up to 29% compared to 15 degrees blade angle. This indicates that the appropriate selection of the second stage turbine blade angle will significantly affect the total turbine power and its efficiency.

Keywords
Blade angle; Two-stage; Water turbine; Crossflow turbine

Topic
Mechanical Engineering

Link: https://ifory.id/abstract/VwjqkCetgn4B

Corresponding Author
Popon Dauni

Institutions
Departement of Informatics, UIN Sunan Gunung Djati Bandung, Indonesia

Abstract
The School Location Information Application is an application developed to produce various information and that can be seen and distributed so that it can be useful to support school searches and their locations. Making a School Location Information Application is done by collecting data, with stages of analysis, design, and implementation. This application is made based on Android for clients using the Java programming language and the server made web based for processing data using HTML and PHP accompanied by SQL as the database manager. The Haversine Formula method is used to determine the distance between the users location and the location of the school in the city of Bandung. The results of the development of the School Location Information Application are expected to be able to overcome all problems and as a support to facilitate the search for schools with available information and school locations that are closest to the users location in the City of Bandung.

Keywords
Android, haversine formula, school

Topic
Computer Science

Link: https://ifory.id/abstract/e9yFYPCvhWZa

Corresponding Author
Rahyuniati Setiawan

Institutions
Universitas Garut

Abstract
The background of this study is the decline in the tourist visits to Sabda Alam Water Park in Garut. Viral marketing plays an important role in raising brand awareness and may affect tourists intention to visit a tourism object. The purpose of this study was to examine the influence of viral marketing on brand awareness and tourists visiting intention. To this end, an explanatory survey was conducted on a sample of 100 visitors to Sabda Alam Water Park selected using a proportionate random sampling technique. Data analysis was performed using path analysis by means of SPSS 21. The results showed that viral marketing had significant positive influence on brand awareness. It was also revealed that brand awareness dan viral marketing had positive influence on tourists visiting intention.

Keywords
viral marketing, brand awareness, tourists visiting intention

Topic
Management Science

Link: https://ifory.id/abstract/2NdcLZF7R4KX

Corresponding Author
Basuki Basuki

Institutions
Institut Pendidikan Indonesia Garut *1, 3, 4, 5
Universitas Padjajaran Bandung *2

Abstract
In this paper we discuss the issue of linear algebra on the investment portfolio optimization models. It was assumed that stock returns are analyzed have a certain distribution, so that the mean and variance and covariance between the separation can be determined. Return of some stock used to form a vector averaging, and the number of shares used as the basis to form a unit vector. While the variance of each stock as well as the covariance between stocks, is used to form a covariance matrix. The investment portfolio was formed consisting of several stocks, in order to maximize the expected return and minimize risk. The portfolio optimization was performed using linear algebra approach. The result is a formula used to determine the optimum composition of the portfolio weights. The resulting formula is very useful for the analysis of the investment portfolio optimization.

Keywords
linear algebra, Optimal Invesment Portfolio

Topic
Mathematics

Link: https://ifory.id/abstract/NaWJD4hqKnjQ

Corresponding Author
Noer Fadhly

Institutions
Department of Civil Engineering, Engineering Faculty of Syiah Kuala University

Abstract
The spatial structure and construction of transport infrastructure in the city of Banda Aceh, which combines the development of "multi-center" and "linear-growth", the structure of service centers for urban activities there has been a shift in the role of urban service centers towards the south and east of the city of Banda Aceh, followed by an increase the growth of activity centers so that not sprawled. This has an impact on the inefficient development of transportation infrastructure with an increase in the number of vehicles 6% per year. The concept of TOD can eliminate urban sprawl, which turns urban sprawl into a compact city area. The method used is path analysis with network connectivity variables (x1),travel time(x2), travel frequency(x3) so that the equation can be obtained: Space Structure =0.52+0.20X3+0,26X2+0,10X1, the relationship with infrastructure development transportation consists from variables, diversity of public/social facilities(X1), travel frequency(X2), travel intent(x3), travel costs(x4) and travel time(x5), so that the equation is obtained, Transportation Infrastructure Development =-1,45+0,65X1+0,38X2+0,23X3+ 0,22X4+0,32X5, from the model obtained, it can be concluded that the development of transportation infrastructure with the concept of TOD is strongly influenced by the structure of space, this can be seen from the influence variables which have lower values if direct effects with the development of transportation infrastructure, but if indirect effects through the structure of space have a greater influence.

Keywords
Spatial structure, transportation infrastructure development, TOD

Topic
Civil Engineering

Link: https://ifory.id/abstract/qKdmCekxFE27

Corresponding Author
Galih Abdul Fatah Maulani

Institutions
Universitas Garut

Abstract
Anticipating the era of Society 5.0, communities and organizations are required to have integrated and comprehensive information access, including the management of mosques in Indonesia. This study aims at providing a strategic planning in the form of a portfolio for future application of mosques management information system services. This study was conducted with reference to Ward and Peppards strategic planning for information systems, which included SWOT analysis, value chain analysis, critical success factor method, balanced scorecard method, and McFarlans strategic grid. The results showed it is necessary for the mosque management to have several applications, mapped into 4 quadrants (strategic, high potential, key operation, and support). It is expected that this application portfolio can help managers of mosques in Indonesia provide faster, more accurate and more accountable information.

Keywords
Strategic Planning; Mosque Management Information Systems; Society 5.0

Topic
Management Science

Link: https://ifory.id/abstract/6CNkZHjDQ8qP

Corresponding Author
Budy Frasetya

Institutions
a) Agrotechnology Department, UIN Sunan Gunung Djati Bandung, Jalan A.H. Nasution No. 105 Bandung 40614, Indonesia
*)budyftq1682[at]gmail.com

Abstract
The drip Hydroponics system has a weakness which at a high evapotranspiration condition cant fulfill plant water requirement properly. Improve the composition of plant growth media with cocopeat and rice husk charcoal as a solution to increase Kailan Plant Growth. This research aims to study the effect of a ratio between cocopeat and rice husk charcoal as plant media on the growth of Kailan Plant with drip hydroponic system. The research was conducted at Jatinangor-Sumedang-West Jawa from November to December 2017. The method of this research was use completely randomized design with five treatment (A=Cocopeat 100%; B=Cocopeat 75%+ Rice Husk Charcoal 25%; C= Cocopeat 50% + Rice Husk Charcoal 50%; D= Cocopeat 25% + Rice Husk Charcoal 75%; E= Rice Husk Charcoal 100%), and five replication. The growth indicator in this research is plant height, number of leaves, leaf area, fresh plant weight, and shoot-root ratio. The ratio of cocopeat and rice husk charcoal as plant growth media affect the plant growth of kailan. The result showed that composition grows media Cocopeat 75% + Rice husk charcoal 25% affect plant height, fresh plant weight, and shoot-root ratio.

Keywords
Drip hydroponic system, Composition plant grow media, Cocopeat, Rice husk charcoal

Topic
Biology

Link: https://ifory.id/abstract/XmajCZhDuL3f

Corresponding Author
Cecep Nurul Alam

Institutions
Department of Informatic, UIN Sunan Gunung Djati Bandung, Indonesia

Abstract
This study explained how to combine the technology readiness and success model of information systems (IS) in the context of exploring the factors that influence the readiness and success of IS implementation performance. As explained by many studies of IS, that most IS research models are developed by adopting, combining, and adapting previous studies. The researchers developed this model based on the input-process-output logic and processional and causal models of the IS success model. The developed model was structured in twelve variables and 42 indicators. The path influences between variables were presented by 28 links. Researchers broke down the model to the level of the assessment instrument in relation to the implementation of the research. However, the model development study may have limited in the used assumptions and understanding of the researchers, the study may contribute theoretically in terms of new model propositions. In addition, the development of the proposed model and the instrument for data collection may be a practical consideration point for further study.

Keywords
Readiness and success model; model development; IS model; IS perfomance

Topic
Information Engineering

Link: https://ifory.id/abstract/6cVnX3ugvAG2

Corresponding Author
Siti Hindun

Institutions
Departement of Pharmacy, Universitas Garut, Jl. Raya Samarang No. 52A Garut, Indonesia

Abstract
Phytosome is one of the technologies use to increase bioavailability for Herbal Medicine in developing a new drug delivery system or commonly known as Novel Drug Delivery System (NDDS). a Phytosome is formed by mixing phytokonstituents and phosphatidylcholine in certain molar comparisons. This study aims to develop a phytosome formula of lyophilized powder steeping panda leaves (Pandanus amaryllifolius Roxb.) with a variation of phosphatidylcholine concentration which produces phytosomes with the highest absorption efficiency. Phytosome is formulated by making three variations of catechin comparison: phosphotidylcholine: cholesterol ranging from 1: 1: 0.2 (F1), 1: 2: 0.2 (F2), 1: 3: 0.2 (F3) using the reflux method. Based on the results of the highest percentage percent adsorption efficiency, F2 with the molar ratio of catechins: phosphotidylcholine: 1: 3: 0.2 cholesterol results in 100% adsorption efficiency. So that it is said that phosphatidylcholine has an effect on absorbing catechin compounds in lyophilized powder steeping fragrant panda leaves (Pandanus amaryllifolius Roxb.)

Keywords
Phytosome, panda leaves, phosphatidylcholine

Topic
Sport Science and Technology

Link: https://ifory.id/abstract/3xZ9JzvPM7hf

Corresponding Author
Aldy Rialdy Atmadja

Institutions
Department of Informatics, UIN Sunan Gunung Djati Bandung, Jalan A H Nasution 105 Bandung 40614, Indonesia

Abstract
Nowadays, online transportation is one of the transportation that is increasingly preferred by people. It becomes important because people need transportation to be more effective and efficient. However, sentiment analysis is necessary to improve the quality of services on online transportation. Sentiment analysis includes the process of extracting opinions, sentiments, evaluations, and emotions of people about online transportation services on Twitter social media. To get more accuracy in classification, the opinion is taken in large amounts and classify into positive and negative class. There are several steps that use sentiment analysis. Data collection, preprocessing data, POS Tagging, and opinion classification use the Naive Bayes Classifier method, compared to the accuracy of the K-Nearest Neighbor method. The results of the comparison of Naive Bayes Classifier and K-Nearest Neighbor algorithms uses 565 data tweets from Twitter, divided 500 trained data, and 65 test data. The result showed that the Naive Bayes Classifier algorithm had achieved the accuracy rate of 66.15%, and K-Nearest Neighbor algorithm produces the accuracy rate of 67.69%. From the results, the K-Nearest Neighbor algorithm perform better accuracy in sentiment classification than Naive Bayes Classifier.

Keywords
Online transportation, Sentiment analysis, Twitter, Naive Bayes Classifier, K-Nearest Neighbor

Topic
Computer Science

Link: https://ifory.id/abstract/YEcKZ8meAJqz

Corresponding Author
Diah Mulhayatiah

Institutions
UIN Sunan Gunung Djati Bandung

Abstract
This study aims to find out the comparison of students physical problem solving skill in harmonic vibration material between students who use REACT- digital and manual worksheets. The method used is quasi-experiment with the research sample taken from two classes totaling 60 students of Islamic schools. The results showed that there were no differences in problem-solving abilities between students who learned using REACT-digital and those using REACT- manual worksheets, because there is an increase in problem solving skills between those using REACT-based worksheets both digital and manual. Problem solving ability is one of the competencies that can be possessed by students in the development of the 21st century which can be obtained by learning using material teaching like worksheets. This finding provides very interesting recommendations in the preparation of teaching and learning that using teaching materials in the form of worksheets must be made on their own according to the appropriate strategy

Keywords
21st century skills, Digital media, Harmonic vibration

Topic
Physics

Link: https://ifory.id/abstract/NyAB48taK6dz