Indonesia Conference Directory

Corresponding Author
Hesti Renggana

Institutions
Departement of Pharmacy, Faculty of Mathematics and Natural Sciences Universitas Garut, Garut, Indonesia

Abstract
Obesity is a metabolic disease characterized by high levels of fat. Previous studies have reported that Jambu Bol leaves (Syzygium malaccense (L) Merr. & Perry) have the efficacy of Antiobesity. To ensure safety, acute toxicity testing is carried out. The test animals used were 24 female white mice, divided into 6 treatment groups. Group 1 as a control group was given aquades. Group 2-6 was given ethanol extract of guava leaves with doses of 300, 1000, 2000, 4000 and 5000 mg / KgBB. The test is carried out for 14 days where the preparation is only given once. The parameters of the study included behavioral tests on the first and 14th day, body weight every day, macropatology of vital organs and organ indexes on the 14th day. The results of all doses of extract did not show a decrease in body weight, behavior changes and macropatological changes but there were differences in organ indexes, so that Jambu Bol ethanol extract can be declared not toxic.

Keywords
acute toxicity, Syzygium malaccense

Topic
Pharmacology

Link: https://ifory.id/abstract/TEh9QXUaZBWY

Corresponding Author
fajar fauzi abdullah

Institutions
a. Departement of Chemistry, Universitas Garut, Jl. Raya Samarang No.52A Garut, Indonesia.
*fajarfauzi[at]uniga.ac.id
b. Sultan Idris University of Education, Faculty of Mathematics and Sciences, Department of Chemistry, 35900 tg. Malim, perak, Malaysia.

Abstract
Objective: This study was to determine the antioxidant activity of marker compounds contained in Kaempferia galanga L. n-hexane extract, by isolating compounds from Kaempferia galanga L. n-hexane extract and examining antioxidant activity. Method: Kaempferia galanga L. dry powder was macerated with n-hexane for 3x24 hours. n-hexane extract was obtained and evaporated until the solution became 30mL then let it sit on the icebath, the residue obtained was then recrystallized with ethanol. The colorless crystalline solids obtained were then tested for antioxidant activity with the DPPH (1,1-diphenyl-2-pikrilhidrazil) method. Results: Spectroscopic analysis including UV Vis, IR, 1D-NMR and 2D-NMR showed that isolates were phenylpropanoid type compounds derived from hydroxycinamic acid in the form of ethyl-p-methoxy-cinnamic and strong intensity antioxidant activity indicated by IC50 value of 58,851 ppm. The benefits of this study can provide a basic knowledge of the utilization of the potential content of the main compounds from Kaempferia galanga L. for the pharmaceutical preparation field.

Keywords
Kaempferia galanga; Antioxidant Activity; Isolation secondary metabolites; ethyl-p-methoxy-cinnamate

Topic
Chemistry

Link: https://ifory.id/abstract/6yZDWe8zpUkx

Corresponding Author
Anggara Budi Susila

Institutions
Department of Physics, Faculty of Mathematics and Natural Science, State University of Jakarta, Jakarta 13220.

Abstract
We study of effecs Al-Cu-Mg/SiCp Metal Matrix Compsite (MMCs) with a matrix composition of 4.4 wt% Cu, 1.8 wt% Mg with SiCp fillers were varied (3.4; 3.7 and 4.0) wt% and the remaining Al. SiCp is mixed into Al-Cu-Mg heated at 900oC, then stir casting is carried out at 250 rpm for 10 minutes. Then cooling are carried out to room temperature. After cold, heat treatment is given and continued testing. The SEM-EDX and XRD test results showed that the increasing SiCp content, the tendency for SiCp and Mg bonds to form the Mg2Si phase increased, making the sample items enlarge and appear more coarse. While the corrosion rate test of increasing SiCp in the Al-Cu-Mg matrix makes Al-Cu-Mg/SiCp samples tend to be more corrosion resistant. The event of declining corrosive properties is due to SiCp particles occupying grain boundary areas replacing O2 (which provides corrosive properties) that are trapped in the sample during the cooling process.

Keywords
Al-Cu-Mg/SiCp casting stir, SiCp filler, corrosion rate

Topic
Physics

Link: https://ifory.id/abstract/pbgktG9jc2Eh

Corresponding Author
Aditiya Harjon

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

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

Abstract
The effects of fossil fuel combustion are famously concerning. 70% of the global production of carbon monoxide is accounted from transportation sector; the sector in which fossil fuel is popularly being continuously used. As one alternative fuels, bioethanol is a renewable fuel which have attracted many researchers in the pursuit of lowering the dependency on fossil fuel and its negative effects to the environment. In third generation bioethanol production, green algae are deemed to carry high potential as the feedstock due to its ampleness, especially in a tropical country such as Indonesia. In this study the ability to produce fermentable sugars from green algae was observed through high-pressurization treatment. Different treatment pressures were achieved through varying temperature set in the autoclave: 110, 120 and 130oC. The recorded pressure was up to about 500 kPa, and this treatment was also compared with non-pressurizing production method. Samples were analyzed for reducing sugars content through DNS method. Since simple sugars are essential in the fermentation stage, the produced sugars from green algae are the indication of potential as the feedstock in bioethanol production.

Keywords
Biofuel; Renewable energy; Bioethanol

Topic
Mechanical Engineering

Link: https://ifory.id/abstract/waLj9Ht4mzqK

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
Faruq Abdur Rouf

Institutions
a. Faculty of Engineering, Jakarta State University. Jl. Rawamangun Muka, East Jakarta, DKI jakarta 13220
*loeqfaruq[at]gmail.com
b. Faculty of Engineering, Jakarta State University. Jl. Rawamangun Muka, East Jakarta, DKI jakarta 13220
*arthur[at]unj.ac.id
c. Faculty of Engineering, Jakarta State University. Jl. Rawamangun Muka, East Jakarta, DKI jakarta 13220
*henita.rahmayanti[at]unj.ac.id
d. Faculty of Engineering, Jakarta State University. Jl. Rawamangun Muka, East Jakarta, DKI jakarta 13220
*arrismaulana[at]unj.ac.id

Abstract
This study aims to examine the level of suitability of the instrument in the Construction Sector of the Handicraft Sub-Sector Building for the Implementation of Plumbing Works issued by the Ministry of Public Works (PU) for SKKNI Kepnaker 2016-304 Plumbing planners, and developing these instruments. The research method used in this study is Content Analysis. The results showed that the instruments issued by the Public Works still did not thoroughly measure the competencies set forth in SKKNI Kepnaker 2016-304 Tukang Plambing, so the development of the instruments was necessary both content, constructs, and criteria, adjusted to the millennial era development.

Keywords
Instruments, Competence, Plumbing

Topic
Civil Engineering

Link: https://ifory.id/abstract/9HkC7fwZGz8Y

Corresponding Author
Massus Subekti

Institutions
Electrical Engineering Study Program, Engineering Faculty, State University of Jakarta

Abstract
This research for performance analysis of ocean water power plant to get design optimization based on research scenarios. The method used is experiment, by conducting a prototype analysis of the initial calculations to be included in the modeling simulation. through research scenarios to get the most optimal prototype performance. The results showed that (1) the greater the pontoon volume used, the greater the pontoon force produced, the pontoon force was not affected by the size of the pump diameter. (2) the larger the diameter of the pump used, the greater the discharge of water produced, the water discharge is not affected by the small volume of the pontoon, (3) the magnitude of the lift system to seawater is not affected by the size of the pump diameter but the size of the pontoon volume, the greater the pontoon volume used, the greater the lift power, (4) the greater the pontoon volume used, the turbine power The result will be even greater with the diameter of the pump, the larger the diameter of the pump used, the greater the turbine power produced. From the results of the study, it can be concluded that the optimal size uses 6 pontoons and 12 inch pump diameters.

Keywords
Analysis, Ocean Waves, Renewable Energy, Leading Regions, Outermost Areas, Underdeveloped

Topic
Electrical Engineering

Link: https://ifory.id/abstract/yjGFMrba9PkN

Corresponding Author
FITRIA LUTHFIYANI

Institutions
a) Institut Teknologi Sepuluh Nopember Surabaya
* fitria.luthfiyani[at]gmail.com
b) Institut Teknologi Sepuluh Nopember Surabaya

Abstract
Traffic safety at railroad crossings considered poorly understood by the road users. A good safety understanding at railroad crossings is necessary to prevent potential accidents. This condition is possibly achieved if factors causing the accidents are clearly known. This study aims to find out factors with potentially causing accidents in a railroad crossing, especially related to traffic volume, vehicle queue length, past year accidents, and land use around the railroad crossing. Data were collected from the data inventory survey, which was then analyzed using regression analysis. The results found three equations types based on the land use, respectively as: Type 1 (Railroad Crossing-Local Road /Collector) Y = 0,97 + 2,819x1 + 0,042x2; Type 2 (Railroad Crossing-Public Facilities) Y = 0,693 + 4,4x1 + 0,006x2; Type 3 (Railroad Crossing-Approaching Intersection) Y = -0,209 + 3,14x1 + 0,018x2. This study can be used in other location depending type of equation. This study was benefited to design the policy as well as the layout of railroad crossings in order to minimize the potential accidents in the railroad crossing areas.

Keywords
Railroad crossing, accident, factors of accident

Topic
Civil Engineering

Link: https://ifory.id/abstract/AdRzWhxNC7Kf

Corresponding Author
Aam Amaningsih Jumhur

Institutions
Universitas Negeri Jakarta

Abstract
The increasing number of production values due to an increase of batik exports to various countries as well as the national exports of batik would certainly help in generating foreign exchange. Batik industry is a culture and tradition based industry in which its raw materials is available in the country. In addition, it also has cultural value and helped absorb quite a lot of labor with owned some special skills. The aim of this study was to determine how the organizational culture variables intervened in the relationship between the human capital variable with competitive advantage variable, so that batik small industry entrepreneur would be able to formulate and choose the right strategy to win the competition by managing its human capital well. This study used primary data in the form of questionnaires distributed to 200 respondents. The data obtained from the questionnaire were analyzed using Classic Assumption Test, Multiple Linear Regression and hypothesis testing (f-test and t-test) with significance level of &

Keywords
Competitive Advantage, Human Capital, Organizational Culture, Small Industry Batik

Topic
Industry Engineering

Link: https://ifory.id/abstract/QvnJehHY6D7E

Corresponding Author
Muktiningsih Nurjayadi

Institutions
(a) Department of Chemistry, Mathematics and Science Faculty, Universitas Negeri Jakarta, Indonesia
(b) Pusat Laboratorium Forensik Badan Reserse Kriminal Kepolisian Republik Indonesia, Indonesia
(c) Balai Besar Uji Standar Karantina Pertanian, Jakarta, Indonesia

Abstract
Salmonella and Escherichia coli are the bacteria the most common cause of food-borne illness. The aim of the study was to detection S. typhimurium and E. coli by Real Time PCR from milk samples. Gene targeted of S. typhimurium was pef and the E. coli gene targeted was fimC. Confirmation test of all primers in contaminated milk with S. typhimurium and E. coli gave different cycle threshold (Ct) value in range 12-13. The detection limit for S. typhimurium with primer pef was in 7,92 pg/&

Keywords
Salmonella typhimurium, Escherichia coli, Milk Sample, Real Time PCR

Topic
Biology

Link: https://ifory.id/abstract/buMe4cWnKxAq

Corresponding Author
Devi Nurrahma Wulandari

Institutions
(a) Jl. Maulana Hasanudin No.63, Cipondoh, Kota Tangerang, Banten 15148, Indonesia
(b) Physics Education Study Program, University of Jakarta,
The way the Youth No.10, Rawamangun - East Jakarta, 13220

Abstract
STEM learning provides students with knowledge and concepts that have relationships and applications in everyday life. In addition, students are given many opportunities to develop the ability to think and literate through the process of engineering design based on scientific knowledge. The purpose of this study was to identify the effects of STEM learning in improving scientific literacy of students at high school level. This study explores the integration of STEM performance to develop students scientific literacy. Learning Physics on the topic of global warming is implemented to produce solar cooker products. Data was collected from field notes, and scientific literacy tests with the value of student can describe and carry out experimental procedures 50%, student can demonstrate logical reasoning in explaining natural phenomena, experimental procedures or outcomes, and application of scientific or technological concepts 100%. Finally, the implementation of the STEM project in physics has provided opportunities for students in physics learning involvement and the development of scientific literacy.

Keywords
STEM Learning, Science Literacy

Topic
Physics

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

Corresponding Author
faiz muqorrir kaffah

Institutions
(1) Department of Informatics, UIN Sunan Gunung Djati Bandung, Indonesia
(2) School of ICT Asian E-University Kuala Lumpur, Malaysia
(3) Department of Information System Sangga Buana YPKP University Bandung, Indonesia

Abstract
The governance of information security in the Indonesian Government has not been completely improved. Many related variables components are not measured. This study aims to observe an evaluation for application of information security index framework in Indonesian government institutions as the implementation of electronic government. The analysis is carried out by adopting an information security index framework produced in the rank of e-government. The study uses a triangulation approach within a mixed method. This study results in a novel adoption model of information security index framework equipped by two new variables. Therefore, a proper policy of the Indonesian government is required for its implementation.

Keywords
Security information, e-goverment, framework

Topic
Computer Science

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

Corresponding Author
marniati marniati

Institutions
Universitas Negeri Surabaya

Abstract
The purpose of this study is to (1) measure student competence in making clothing produced in the copyright in terms of leadership variables, work culture, achievement motivation, and work performance. (2) analyze the influence of leadership, work culture on achievement motivation, (3) analyze the influence of leadership, work culture and achievement motivation on work performance both directly and indirectly. This study uses a quantitative approach. The research subjects of all students who programmed copyright courses were 50 people. The data collection method uses a Likert scale questionnaire, the data is analyzed bypath analysis. The results showed that: (1) leadership had a significant influence on work performance (2) work culture directly on work performance, (3) achievement motivation had a significant effect on work performance, (4) leadership, work culture, and achievement motivation have simultaneous influence on work performance in the industrial revolution era 4.0

Keywords
leadership, work culture, achievement motivation, and work performance, the era of industrial revolution 4.0

Topic
Management Science

Link: https://ifory.id/abstract/B39qdCDRApzt

Corresponding Author
Dindin Nasrudin

Institutions
Prodi Pendidikan Fisika
UIN Sunan Gunung Djati Bandung

Abstract
Waste is still a problem in certain areas. It is necessary to innovate the use of waste into a useful material, one of which is an energy source. This paper aims to describe the physical concepts that exist in the processing waste into an energy source. The method used is descriptive. This research shows that there are several physics concepts that play a role in the processing of waste into energy sources: force, pressure, fluid, energy, thermodynamics, electricity and others. This study concluded that the waste treatment process contains many physical concepts that can be packaged in the form of physics enrichment materials. The development of physics enrichment materials is expected to improve student literacy and awareness of waste and the physical concepts contained in it.

Keywords
electricity, power, waste

Topic
Physics

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

Corresponding Author
Silvi Aryanti

Institutions
Physical Education and Health of Teacher Training and Education Science Faculty,
Universitas Sriwijaya, Palembang, Indonesia
Email: silviaryanti[at]fkip.unsri.ac.id, richarda2_060[at]ymail.com, herriyusfi[at]fkip.unsri.ac.id

Abstract
Abstract. The purpose of this study is to develop a badminton long forehand service learning technique for female students of class X so that learning objectives can be achieved using research and development (R n D) with analysis, design, development or production models, implementation or delivery and evaluations (ADDIE). Respondents in the study were female students of class X Senior High School Number 14 Palembang. The product in this study produced a long badminton forehand service manual. Based on the results of the expert validation of badminton games in the category of quite decent. Results validation of experts in Physical Education, Sports and Health in the category of quite decent. The implication of this study is that long forehand service learning techniques can be used for badminton learning.

Keywords
Learning Techniques, Badminton Games, Physical Education

Topic
Sport Science and Technology

Link: https://ifory.id/abstract/d6pFan8vLmrH

Corresponding Author
Jajang Supriatna

Institutions
a) Study Program of Agrotechnology, Faculty of Agriculture, Universitas Garut, Jl. Raya Samarang No.52A, Garut, Indonesia
*jajangsupriatna[at]uniga.ac.id
b) Indonesian Vegetable Research Institute, Jl. Tangkuban Parahu No. 517, Lembang, Indonesia

Abstract
Morphophysiological characters associated with yield in warm climate area can be used to determine heat stress tolerance characters. Simple correlation and path analysis were used to ascertain the relationship between morphophysiological characters and yield, and to estimate direct effects as well as indirect effects on them. Nine potato cultivars were evaluated in Garut, Indonesia which is situated at an altitude of 732 meters above sea level with an average temperature of 28oC. Randomized Block Design was used in this experiment and it was performed in triplicate. As the result, simple correlation indicated that plant height, leaf number, leaf size, stomata density, dry weight, tuber number, and tuber diameter showed positive significant relationship with yield, whereas chlorophyll content showed negative significant relationship with yield. Futhermore, path analysis indicated that leaf number had the highest positive direct effect on yield followed by plant height, and leaf size, whilst stomata density and dry weight had positive indirect effect on yield through tuber number. In conclusion, leaf number, plant height, and leaf size are the primary character, whereas stomata density and dry weight are the secondary character for selection the heat stress tolerance characters in order to develop high-yield potato cultivars in warm climate area.

Keywords
Correlation; Path Analysis; Heat Stress Tolerance; Potato

Topic
Biology

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

Corresponding Author
Eti Herawati

Institutions
Universitas Negeri Jakarta

Abstract
This study aims to determine factors that cause learning difficulties to anatomy and physiology subjects lesson by class X student cosmetology Programs at SMK Negeri 3 Tangerang in Academic Year 2016 with a survey method. The populations were 64 people from class X students and Data collection tool used is questionnaires. The trial questionnaires carried out by 25 class XI cosmetology respondents. Instrument analysis carried out on validity and reliability, with 40 statement items and reliability result r11 = 0.954. The results of this study showed that the factors affecting students difficulties mainly on internal factors that are motivational factors indicators with sub student 88% learning persistence factor and independent learning factor equal to 94%. While external factors are indicators of teacher attention factor, with teachers sub-factor appreciation to students difficulties by 84%, and the factor of teachers involvement in students activities is equal to 91%, showing that any increase in the value of a teacher attention every 101,286 can cause an 879 increase with learning difficulties showed the 6.1% test effect, coefficient determination while the remaining 93.9% is influenced by other factors.

Keywords
Factors of Learning Difficulties, Physiology Anatomy

Topic
Biology

Link: https://ifory.id/abstract/EvPgM4NdKkr9

Corresponding Author
Nitta Puspitasari

Institutions
1Program Studi Pendidikan Matematika, Institut Pendidikan Indonesia, Jl. Pahlawan No.32 Tarogong Garut, Jawa Barat, Indonesia.
2Progran Studi Teknologi Pembelajaran Pascasarjana, Institut Pendidikan Indonesia, Jl. Pahlawan No.32 Tarogong Garut, Jawa Barat, Indonesia.

Abstract
Statistics and probability are parts of mathematics that are often used in everyday life. However, to be able to understand statistics and probabilities a thinking process is needed is not easy. To determine the extent to which respondents understanding of statistics and probability survey conducted by giving the test to 115 respondents. The results showed that respondents difficulties in statistics and probability were difficulties in probabilistic reasoning, combinatoric reasoning, and proof of variability in random variables.

Keywords
-

Topic
Mathematics

Link: https://ifory.id/abstract/pakjq2nZEXb7

Corresponding Author
Daryanto, M.T. -

Institutions
1,3. Electrical Engineering Education Study Program, Faculty of Engineering, Jakarta State University, Jakarta, Indonesia.
2. Technology and Vocational Education Study Program, Faculty of Engineering, Jakarta State University, Jakarta, Indonesia.
4. Center for Education and Culture Policy Research, Board of Research and Development, Ministry
of Education and Culture, Jakarta, Indonesia

Abstract
The use of Information and Communication Technology (ICT) for school management is very helpful in providing services to students and other stakeholders. ICT as a technology can be useful if used to improve its performance. Whereas someone will use technology to assist in completing his work if he feels that the technology is easy to use. A persons perception of existing technology will encourage the use of this technology in its work. This study aims to examine the effect of perceptions of ease of use of ICTs on service quality in vocational high schools in West Java. The method used in this study is a causal survey. Sampling in this study used proportional random sampling technique with a total sample of 150 respondents. The research data were analyzed using path analysis with the Partial Least Square (PLS) approach. The results of this study indicate that the perception of ease of use of ICT affects the quality of service to stakeholders in vocational high schools in West Java.

Keywords
perception, stakeholders, service quality, ICT

Topic
Management Science

Link: https://ifory.id/abstract/jb7Dx8dCNntP

Corresponding Author
Selly Anastassia Amellia Kharis

Institutions
a) Faculty of Mathematics and Science, Universitas Negeri Jakarta
Jalan Rawamangun Muka, Jakarta 13220, Indonesia
*sellyanas[at]yahoo.com

Abstract
The ability to understand mathematical concepts is one of the abilities needed by students in mathematics learning. This study aims to compare learning model between reciprocal teaching and problem posing for student mathematical understanding. This research was conducted at SMP 97 Jakarta in class VII on the subject of One Variable Linear Equations. The research method used quasi experiment. The sampling technique uses two stage sampling; purposive sampling and cluster random sampling. Based on the research data, the average value of understanding the mathematical concept of experimental class I (reciprocal teaching model) is 70.83 while the experimental class II (problem posing model) is 64.35. The normality test using the Liliefors. Homogeneity testing using Fishers test. The research hypothesis test uses t-test statistics and the value of t count = 2.153 and t table = 1.667. Because tcount> t table, then H0 is rejected at the significance level &

Keywords
Student Mathematical Understanding, Problem Posing, Reciprocal Teaching

Topic
Mathematics

Link: https://ifory.id/abstract/YM4nmuceyRHp

Corresponding Author
Saddani Djulihenanto Djulihenanto

Institutions
State Polytechnic Of Malang

Abstract
One of attractive solution for PV ac-module is flyback-type micro inverter since it has a number of advantages include simple control, stable current injection and potentially low-priced technique. However, the typical flyback-type micro inverter would produce high voltage ripple in the DC-link. As a concequence, a high total harmonic distortion would likely be expected in the system. Therefore, a technique for minimising the total harmonic distortion within standard level is required. Generally, adding capacitor in the DC-link is usually considered as the solution to reduce the voltage ripple. This technique is not a cost-effective solution. Furthermore, the dimension of the inverter package will be bigger to have more space for additional capacitors. This paper proposes a control method to reduce harmonic level for flyback-type micro-inverter using Maximum Power Point Tracker (MPPT). The MPPT technique decribed in this paper used perturb and observe (P&O) method. This method is simple and yet highly efficient. Several experiments have been carried out to examine the effectiveness of the proposed method. The results show that the proposed method can reduce the harmonic level significantly. Moreover, the method can reduce the capacitance used in the DC-link of the flyback inverter.

Keywords
flyback-inverter, total harmonic distortion, perturb & observe, maximum power point tracker

Topic
Electrical Engineering

Link: https://ifory.id/abstract/grGvAWcbtZe9

Corresponding Author
Ekananda Sulistyo Putra

Institutions
State Polytechnic of Malang

Abstract
This paper presents a study of long range (LoRa) communication for monitoring of a ship electrical system. Three categories of electrical system include generator, power distribution, and navigation are monitored. A low power communication technology of LoRa is used to transmit electrical variables such as current, voltage, and power are logged and sent to the server. Experiments using LoRa SX1278 and Arduino have been inducted to validate the performance of the communication. Three spreading factors 12, 7, 6 have been tested. From experiments results, the performance of the communication has been analyzed, if has been found that 97% successful data transmission was achieved with maximum distance. Furthermore, small baudrate communication was more suitable for the application.

Keywords
Long Range (LoRa) Communication; Monitoring; Ship Electrical System

Topic
Electronics Engineering

Link: https://ifory.id/abstract/Xfb2gcJDBaW4

Corresponding Author
kristoko hartomo

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

Abstract
Landslides are an activity of the process of disturbance of balance which causes the movement of the soil and rocks from higher ground to lower ground. Boyolali District is one of 35 cities / regencies that have a high level of vulnerability to the occurrence of landslides. In this research, the mapping of landslide-prone areas using landslide-causing parameters such as thiessen rainfall, soil type, drainage, slope, and land cover. From these parameters will be processed and analyzed by using the scoring method, where scoring is a calculation system that can be used as a control system and problem solving that can be used to detect landslide areas in Boyolali District. In the process of analysis is done by using the features of spatial analysis tools in the form of Overlay software Qgis and R Studio. Then we will get the result of the map of landslide vulnerability level that has 3 classes of vulnerability, including low vulnerability class, medium vulnerability class, and high vulnerability class.

Keywords
Landslides; mapping, thiessen, spatial

Topic
Computer Science

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

Corresponding Author
Theofany Harley Chriswardana

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

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

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

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

Keywords
Biofuel; Renewable energy: Bioethanol

Topic
Mechanical Engineering

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

Corresponding Author
Nailul Muna

Institutions
State Polytechnic of Malang, Soekarno-Hatta Street No. 9, Malang 65141, Indonesia

Abstract
Coin recognition system is a very important role in currency processing systems, which is aims to minimize human miscalculation and time to calculate coin values. Coin identifier and recognition to calculate the value of Indonesian coins based on android developer presented in this paper. There are two coin parameters used for coin recognition including radius and color of the coins. Circle Hough Transform (CHT) is used to calculate radius parameters, based on android developer and computer vision. After the radius value is obtained, the average RGB value of the coins is detected to determine the color parameters. By calculating the diameter and knowing the color, the coins can be recognized and the total value of the coins in the input image can be known. The experimental results show that the system has been obtained indicate that the system successfully recognizes coins based on determined algorithm. That is mean the application using computer vision can recognition coin and count the value of coins.

Keywords
Coin identifier and recognition, Circle Hough Transform (CHT), Calculate value

Topic
Computer Science

Link: https://ifory.id/abstract/tEjeAnrGL4Da

Corresponding Author
Yheni Mulyaningsih

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

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

Abstract
In a mission to reduce the world-s dependency on non-renewable energy sources, through decades, researches are striving to find the best alternative energy substitutions. Considering the abundance availability of renewable sources, green algae are discovered as one promising candidate of future energy alternative. The aim of this research is to study the bioethanol production from green algae through acid hydrolysis. In this study, the acid hydrolysis was performed by utilizing sulphuric acid (H2SO4) at concentration range of 1.0M-2.0M. Further, hydrolysis temperature was also varied at 50, 70 and 90°C. In this stage, a fixed hydrolysis period was set for 30 minutes. As acid pretreatment is considered in this study as an effective way to convert carbohydrates into fermentable sugars, the sugars produced in this experiment would lead to an excellent grade of bioethanol produced. From the obtained result, green algae show a feasibly potential as the third generation bioethanol feedstock, which worth for substituting the use of fossil fuel in the near future.

Keywords
bioethanol; green algae; acid hydrolysis;

Topic
Mechanical Engineering

Link: https://ifory.id/abstract/zgBR6k3F4XAU

Corresponding Author
jamaaluddin jamaaluddin

Institutions
Universitas Muhammadiyah Sidoarjo

Abstract
The use of Fuzzy logic in the forecasting process, problem analysis and decision making of a process are often used. The development of this fuzzy logic by widening the foot of the membership function as interval fuzzy type 2, fuzzy signature or carried out hybrid between fuzzy logic and other artificial intelligence systems or hybrid algorithm has also got quite good results. At this time, a multilevel fuzzy logic method is proposed. This multilevel Fuzzy Logic is interesting behind the input of a process in fuzzy logic which is the output of the previous fuzzy logic or the output of a fuzzy logic analysis is input into the next stage of fuzzy logic. This multilevel fuzzy logic can be done up to several levels of depth according to the variables to be analyzed. If the final analysis has the equation X(i) + Y(i) = Z(i), then the value of X (i) can be the result of Z(i-1), where Z(i-1) is the result of the Fuzzy Logic X(i-1) + Y(i-1), by performing multilevel fuzzy Logic is expected to have the value of forecasting errors or problem analysis and decision making will be better and more precise.

Keywords
Fuzzy Logic, Multilevel Fuzzy Logic, Interval Fuzzy Type-2

Topic
Computer Science

Link: https://ifory.id/abstract/64nNhDVArMWt

Corresponding Author
Mega Achdisty Noordyana

Institutions
Institut Pendidikan Indonesia Garut, Jl. Terusan Pahlawan 32, Garut 44151, Indonesia.
*disty.0101[at]gmail.com
*mega[at]institutpendidikan.ac.id

Abstract
Wingeom program is a mindtool to solve geometry problems. It is used to develop dimensional geometry frameworks. The program can help visualize geometric concepts so clearly that respondents will understand geometry concepts effortlessly. Driven by this expediency, this design base research was carried out in three stages; what to learn, how to learn, when to learn, monitor the ongoing process and evaluate what has been planned, done, and the results of the process. This research is expected to be an alternative and solution in overcoming difficulties in understanding the Geometry concepts. Five respondents were selected to participate in this study. The results of the study showed that the respondents were able to explore, observe, and perform animated images and dimensional geometry material.

Keywords
Wingeom Program, Design base Research

Topic
Mathematics

Link: https://ifory.id/abstract/RfVv68JqEAxY

Corresponding Author
Septyana Riskitasari

Institutions
State Polytechnic of Malang

Abstract
This paper describes a design process of the wind generator control system. Controlling a wind generator, fan, is important to study the design of the wind turbine. A complex wind generator model was approximated with 5th order polynomial function. The paper describes a procedure for identifying system, especially for finding the transfer function of a plant, that based on input and output. The plant input is an electric motor fan voltage and output is wind speed produced. It is important to simplify control design of the wind generator for configuring transfer functions of the plant. The identification method that is used is Linear Regression, applying Excel program, which produces a polynomial function. And then, the Matlab System Identification Toolbox (SIT), which produces a transfer function. From this study, applying SIT, a model of wind generator, shows the fit estimation data is 90.78% and MSE is 0.078%. A closed-loop control system using PID controller is proposed. Controllable and Observable of the state space model were verified. The best performance of the close-loop system was achieved using Kp = 0.2247, Ki = 6.05*10-5, and Kd = 208.75 applying Ziegler-Nichols. The result shows that closed-loop stability of wind generator system is stable.

Keywords
Wind Generator; SIT, PID; Controllable; Observable

Topic
Electronics Engineering

Link: https://ifory.id/abstract/LDXTKWrbN7ca

Corresponding Author
Wahyu Aulia Nurwicaksana

Institutions
State Polytechnic of Malang

Abstract
This paper presents a mechanical design and electronic control for the angle of attack on the Vertical Axis Wind Turbine(VAWT) darrieus type with NACA0015 and 3 blades. This research was conducted to obtain high efficiency absorption power on various wind speed. The VAWT mechanical design is based on systematic calculations with a height of 150cm and a diameter of 120cm. NACA0015 airfoil with calculations in the NACA airfoil database obtained blade length of 15.892cm and width of 1.905cm. The electronic control on this system, Arduino mega controller, has input from an anemometer sensor, and rotary encoder sensor. While, the output is servo motors for 3 blade. A microprocessor control unit is programmed to control the adjustment of blade angle of attack. The angle of attack is defined by wind speed, angular speed of VAWT, and a defined TSR (Tip Speed Ratio). The angle of attack control method is PID (Proportional-Integral-Derivative) algorithm. By setting the TSR value constantly at 3.5-4, the angle of attack will be adapted even on any various wind speed. As a result, the maximum power absorption will be obtained on various wind speed. This system can increase power efficiency of VAWT up to 35-40%.

Keywords
Angel of Attack; Power Optimizing; TSR; Various Wind Speed; VAWT

Topic
Electronics Engineering

Link: https://ifory.id/abstract/Uj2WuqzbZ4pn