Indonesia Conference Directory

Corresponding Author
Rina Febriana Hendrawan

Institutions
a) Technology and Vocational Education, Faculty of Engineering, Universitas Negeri Jakarta, Jakarta, Indonesia
*rinafebrianaunj[at]gmail.com
b) Electrical Engineering Education Study Program, Faculty of Engineering, Universitas Negeri Jakarta, Jakarta, Indonesia

Abstract
This study was conducted to explore the importance of graduate work skills through an industry perspective. Respondents consisted of 23 industry in various fields in Jakarta. The instruments used in this study were adapted from the SCANS model and integrated the Indonesian National Qualifications Framework (KKNI). The results of the survey show that the industry has a high interest in employability skills and achievement of employability skills indicators for students in Jakarta. This study also indicates that there is no significant difference between company size and employability skills. However, there are substantial differences between indicators in employability skills.

Keywords
Industry, employability skills, managerial skills, attitude

Topic
Industry Engineering

Link: https://ifory.id/abstract/LEZJQTe4aAmY

Corresponding Author
Ratna Dewi Wulaningsih

Institutions
1 Universitas Negeri Jakarta (UNJ) Department of Biology, Faculty of Mathematics and Natural Sciences, Kampus A, Gedung Hasjim Asjarie Lt. 9. Jl. Rawamangun Muka Jakarta Timur, 13220, Indonesia

Abstract
One of the compounds contained in neem is flavonoid glycosides, which have anti-fertility effects by reducing hyaluronidase activity, so can prevent penetration of spermatozoa in mice. The mechanism of inhibition of spermatozoa penetration by flavonoids caused by decrease in hyaluronidase activity possible of the influence of gene expression disturbances, so enzyme synthesis decreases. However, the mineral contained in the seeds and leaves of neem can induce oxidative stress in animals, characterized by the increase of Lipid Peroxidation Potential (LPP) in tissues. LPP can be determined by measuring malondialdehyde (MDA) molecules taking the standard thiobarbituric acid (TBA) test. Male mice were divided into nine groups: control (C0), Group t1 - t4 were treated by administering water seeds and leaves extract of neem at doses 0.25 and 0.50 mg/kg bw for 36 days through intraperitoneal injection, without reversibility testing, group T5-T8 were treated by administering water seeds and leaves extract of neem at doses 0.25 and 0.50 mg/kg bw for 36 days followed by reversibility testing for 36 days, with four replications. The results showed the administration of water seed and leaves extract of neem could reduce the MDA levels of mice testis. Conclusion is quality of testicular mice is influenced by oxidative stress conditions in male mice.

Keywords
Water, seeds, leaves, MDA, mice, neem, testis

Topic
Biology

Link: https://ifory.id/abstract/tA8rV4gkc7GP

Corresponding Author
Lia Kamelia

Institutions
Faculty of Sciences and technology
UIN Sunan Gunung Djati Bandung

Abstract
An automated system will simplify all the work done by humans. One of the automatic systems that has been used is the battery charger system that can be cut by itself. This paper discussed the implementation of automatic systems for battery chargers based on floating techniques. The system will automatically fill and repair the battery from several causes of damage such as overcharging the battery. This charger functions with the switch system turning on and off. The circuit works by comparing the input that goes into the IC, and makes the control input as the main standard of 1.10 V which is attached on a positive foot (pin3) on the IC. The main control system consists of Transistor BC547, IC LM358 and Transistor 2N2907A. This system also uses two transformers, each of which is used to support control and power supply. For the control section using 1A transformer and for power supply using 2A. This system will automatically switch on when the load level is below 12.27 V. From the test results of 1 hour charging, the average charging voltage is 1.718 V and the measured output current is 0.8 A.

Keywords
Automation;battery;charger;float technique

Topic
Electronics Engineering

Link: https://ifory.id/abstract/cTEFkjytVWn4

Corresponding Author
Wiyoga Baswardono

Institutions
a) Department of Informatics, Sekolah Tinggi Teknologi Garut, Jalan Mayor Syamsu 1, Garut, Indonesia
*wiyoga.b[at]sttgarut.ac.id
b) Department of Industrial Engineering, Sekolah Tinggi Teknologi Garut, Jalan Mayor Syamsu 1, Garut, Indonesia

Abstract
This article aims to a comparative analysis of decision tree algorithms between random forest and c45 for airlines customer satisfaction classification. The comparative study predicts both algorithms have better accuracy, precision, recall AUC (area under the curve) for analyzing data set of customer satisfaction on airlines, which are useful for later if have some same kind set of data set and problem. In this particular comparative analysis, first, need to select the dataset and transform so it can be used for data mining technique classification after choosing the algorithm to analyze the data set. The analyzing of the dataset it will through validation, testing and also result for each algorithm used. Then will compare the result from each algorithm, to determine which algorithm are best to use in this particular dataset or problem for customer satisfaction for airlines. The results of the comparative analysis are the best alternative algorithm choice for use in airline customer satisfaction classifications.

Keywords
comparative analysis; classification; algorithm; deccision tree; customer satisfaction

Topic
Computer Science

Link: https://ifory.id/abstract/UFQMX9HCEuzJ

Corresponding Author
Luh Gede Pradnyawati

Institutions
Faculty of Medicine & Health Sciences of Warmadewa University

Abstract
Stunting is a growth disorder based on measurement of PB / U or TB / U characterized by a short body state. Toddlers were categorized short if the z-score of the scores is less than -2SD. In Indonesia 29% of children are short category. There are several risk factors that influence stunting including short-term pregnancy, mother-s height, LBW, number of children, age of MP-ASI, exclusive breastfeeding and frequency of infection history with stunting in toddlers. The purpose of this study was to determine the risk factor of stunting in toddlers at Puskesmas Klungkung I. This research is a case-control research with retrospective approach. The sample size used in this study were 35 case samples and 70 control samples, through purposive sampling technique. The data collected in the form of primary data and secondary data. Data were analyzed by bivariate analysis with chi square test and multivariate analysis with multiple logistic regression. Chi square test showed that the risk factors for stunting were LBW, exclusive breastfeeding, age of MP-ASI, frequency of infection history and mothers height. Gestational distance and the number of children were not risk factor for stunting in this study. Multiple logistic regression test showed LBW (OR = 21,98; 95% CI: 2.04-237,69) and mother height (OR = 7,37; 95% CI: 1,94-28,02) became dominant risk factor of stunting incidents in toddlers at Puskesmas Klungkung I. These results indicate that mother-s height and LBW are the risk factors for stunting. Therefore, they need more attention to reduce the incidence of stunting.

Keywords
Risk factors, stunting and toddlers

Topic
Biology

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

Corresponding Author
Elsa Lisanti

Institutions
1 Universitas Negeri Jakarta (UNJ) Department of Biology, Faculty of Mathematics and Natural Sciences, Kampus A, Gedung Hasjim Asjarie Lt. 9. Jl. Rawamangun Muka Jakarta Timur, 13220, Indonesia
2 Department of Veterinary Clinic, Reproduction and Pathology, Faculty of Veterinary Medicine, Institut Pertanian Bogor (IPB), Dramaga Bogor 16680, Indonesia)
E-mail : sajuthi[at]indo.net.di
3 Departement Anatomy, Physiology, and Pharmacology,Faculty of Veterinary Medicine, Institut Pertanian Bogor (IPB), Dramaga Bogor 16680, Indonesia
4 Center Isotopes Radiation Application, National Nuclear Energy Agency of Indonesia. Jl. Lebak Bulus Raya No. 49 Jakarta Selatan, Indonesia

Abstract
Neem (family Meliaceae) is non-leguminous multipurpose plant has antispermatogenic effect in animals and male men. Objectives: this research to assess and evaluate the effect of aqueous leaves extract of neem on the development of spermatogenic cell of male mice. Methods: Male mice were divided into five groups. Group I as control (C1-1) with the absence of treatment. Group II and III were orally treated by aqueous leaves extract of neem at doses 0.25 and 0.50 mg/kg bw for 36 days. Group IV and V were treated by administering aqueous leaves extract of neem at doses 0.25 and 0.50 mg/kg BW for 36 days followed with another 36 days with no treatment. Results: neem leaves extracts to cause decrease of spermatogenic cell (spermatogonia, spermatocyte, and spermatid) (p<0.05). Observation of testicular histology in treated mice showed degenerative changes that are not homogeneous in the seminiferous tubules. Tubular mice treated showed loss of the germinal epithelium, and reduction in the number of germ cells (spermatogonia, spermatocyte, and spermatid) in the testes of treated mice. After 36 days of stopped of treatment, the number of germ cells had not recovered as control (p <0.05). Conclusion: These results indicate that the aqueous extract of neem leaves is irreversible to testicular histopathology and decreases the development of spermatogenic cells in male mice.

Keywords
Aqueous; Leaves; Mice; Neem; Testis

Topic
Biology

Link: https://ifory.id/abstract/btkNnvdKwD72

Corresponding Author
Erina Rahmadyanti

Institutions
Universitas Negeri Surabaya

Abstract
Wastewater is commonly reused in agriculture in many agricultural countries such as Indonesia. However, this condition leads to various health and environmental issues. In previous studies, Moringa oleifera seeds provably found to be a strong natural coagulant and disinfectant. Yet, its ability to improve the effluents for the leachate treatment in constructed wetland is still unknown. This study aims to investigate the effect of Moringa oleifera seeds in reducing several effluent parameters of landfill leachate from constructed wetland. There was no prior treatment before discharging landfill leachate into subsurface flow constructed wetlands and flew it into flocculation coagulation process using Moringa oleifera seeds. The parameters studied were organic substances (BOD and COD), heavy metals (Cr and Pb) and coliform to determine the efficiency. Result indicated that using Canna indica in constructed wetland followed by Moringa oleifera seeds as flocculation coagulation had more than 85% removal efficiency in all parameters. Although it showed adequately high in the efficiency, the standard sets for bacteriological substance for effluent parameters are yet fulfilled. Therefore, further researches especially by combining Moringa oleifera seeds with other coagulants are necessarily conducted in order to meet the expected requirements.

Keywords
Moringa oleifera seeds, leachate, constructed wetland, flocculation coagulation

Topic
Environmental Engineering

Link: https://ifory.id/abstract/qDtEhHyMXW3P

Corresponding Author
Desi Nur Liana

Institutions
(1)Department of Vocational Teacher of Education, Sebelas Maret University, Jl. Ir. Sutami 36A, Surakarta, Indonesia
(2)Department of Mechanical Engineering Education, Sebelas Maret University, Jl. Ahmad Yani No.200, Pabelan, Surakarta, Indonesia

Abstract
The potential energy analysis of biomass waste as a sustainable source of energy continues to increase with various design to obtain maximum efficiency. Modification of the type of material, diameter, and length of the connecting tube between the reactor and the condenser can increase its effectiveness. The optimal parameter search for the connecting tube that produces liquid-smoke are carried out using galvanized pipes and stainless-steel pipes with variations in diameter ¼ inch, ¾ inch, and length 1 meter, 0.5 meters. Testing the quantity of liquid-smoke results on sugar palm waste samples was carried out at 400 C for 60 minutes by seeing an increase of the amount of liquid-smoke. The results of the study show variations in size and type of tube affect the product yield of the pyrolysis process. Stainless-steel pipes have better performance to produce liquid-smoke. The shorter the length of the pipe increases the quantity of liquid-smoke, but the smaller the diameter of the pipe decreases the quantity of liquid-smoke. This paper discusses in more detail the comparison of the performance of connecting tube by modifying the type of material, the length, and the diameter of the pipe.

Keywords
Biomass pyrolysis, connecting tube, liquid-smoke

Topic
Mechanical Engineering

Link: https://ifory.id/abstract/BfzPQJ8AmLRy

Corresponding Author
Wiyoga Baswardono

Institutions
Department of Informatics, Sekolah Tinggi Teknologi Garut, Jalan Mayor Syamsu 1, Garut, Indonesia
*wiyoga.b[at]sttgarut.ac.id

Abstract
The articles aim to analyze and design of human resource information system (HRIS) for micro small and medium enterprises in Indonesia. The problem some times occurred happen in human resource when business starts to grow. To solve this start with analyzing and design in this HRIS system using RUP (Rational Unified Process) to handle a problem such as attendance, payroll, manage employee and other Human resource problem in the scope of small or medium business. The result is a design of HRIS that can be a start for a blueprint and can be implemented for micro small and medium enterprises with condition and regulation that fit in Indonesia.

Keywords
information system; HRIS; design system; enterprise system

Topic
Computer Science

Link: https://ifory.id/abstract/HD7cGKFwXULp

Corresponding Author
Luh Gede Pradnyawati

Institutions
Faculty of Medicine & Health Sciences of Warmadewa University

Abstract
Uric acid is the end product of purine metabolism in the human body. At least allantonin causes the human body susceptible to hyperuricemia. Hyperuricemia can cause gout arthritis. According to Bali Province Basic Health Research in 2013, Karangasem Regency occupies the first position of prevalence of arthritis incidence in Bali Province. Puskesmas Kubu 2 occupies the fourth position of arthritis incident in Karangasem and most patients from Kertabuana Sub District. This study aims to determine the risk factors of hyperuricemia occurrence in people aged over 24 years in Banjar Kertabuana. The method used cross sectional with Systematic Random Sampling technique. The instruments of this study were questionnaires, measurements of uric acid, and calculation of Body Mass Index. Data were analyzed by Chi Square bivariate test and multivariate test of Binary Logistic Regression with Backward Conditional method. The result was 102 (60%) respondents had hyperuricemia and 68 (40%) of respondents did not have hyperuricemia. Chi Square test showed that age, sex, family history, high purine consumption pattern, alcohol consumption, obesity were hyperuricemia risk factor and significant (p <0,005). Multivariate analysis with Binary Logistic Regression Test, high purine consumption pattern was risk factor with highest OR (odd ratio) of 12,179 (95% CI: 4,978-29,798) and family history did not pass multivariate test with p equal to 0,104. This study is expected to be used as a guidance counseling to the community to prevent the incidence of hyperuricemia and provide scientific information to researchers about risk factors that affect the incidence of hyperuricemia.

Keywords
Hyperuricemia, risk factor hyperuricemia

Topic
Biology

Link: https://ifory.id/abstract/2K9zFyXAavqu

Corresponding Author
Elsa Lisanti

Institutions
1 Universitas Negeri Jakarta (UNJ) Department of Biology, Faculty of Mathematics and Natural Sciences, Kampus A, Gedung Hasjim Asjarie Lt. 9. Jl. Rawamangun Muka Jakarta Timur, 13220, Indonesia
2 Department of Veterinary Clinic, Reproduction and Pathology, Faculty of Veterinary Medicine, Institut Pertanian Bogor (IPB), Dramaga Bogor 16680, Indonesia)
E-mail : sajuthi[at]indo.net.di
3 Departement Anatomy, Physiology, and Pharmacology,Faculty of Veterinary Medicine, Institut Pertanian Bogor (IPB), Dramaga Bogor 16680, Indonesia
4 Center Application Isotopes and Radiation (CAIR), National Nuclear Energy Agency of Indonesia, Jalan Lebak Bulus Raya No. 49 South Jakarta, Indonesia

Abstract
Neem is a herbal plant that can be used as male contraceptive, by preventing the penetration of spermatozoa in the process of in vitro fertilization. However, the mineral content found in the seeds and leaves of neem can induce oxidative stress in mice, characterized by increased lipid peroxidation potential in the spermatozoa. This study aimed to evaluate the malondialdehyde levels of spermatozoa were epidydimal in mice. To calculate MDA levels in spermatozoa a standard thiobarbituric acid (TBA) method is used. The first group was plot as a control. The four groups were orally treated by neem leaves (two groups) and seeds extract (two groups) in 0.5 mL/mouse/day at doses 0.25 and 0.50 mg/kg bw each for 36 days then were sacrificed. The other four groups were treated same as those in the previous four groups and sacrificed at 36 days post last treatment. Data were analyzed by randomized completely design (RCD) in the test differ of 5%. The results showed that the administration of seed and leaves of water extract of neem did not reduce the MDA levels of sperm mice. The conclusion that the mineral content of neem extracts (seeds and leaves) are safe to use.

Keywords
Seeds, leaves, MDA, mice, neem, spermatozoa

Topic
Biology

Link: https://ifory.id/abstract/7XhebYj6qcfA

Corresponding Author
Dahlia Fisher

Institutions
1Department of Mathematic Education, Postgraduate School, Indonesian Education University, Jl. Setiabudi No. 229 Bandung.
2 Fakultas Keguruan dan Ilmu Pendidikan Unpas, Jl. Tamansari No.6-8 Bandung 40116.

Abstract
Abstract. This study aims to determine students mathematical reasoning abilities on systems of linear equations and aplications. This research was conducted in the odd semester of the 2018/2019 academic year. The population in this study were all students of class VIII in one of the Junior High School in Bandung with a total sample of 32 students. The research instrument used in the form of test mathematical reasoning abilities. The research method used is qualitative research design. Data were analyzed using data reduction, data presentation, and conclusion. Based on the results of the study it can be concluded that the mathematical reasoning ability of junior high school students in systems of linear equations and aplications is still low.

Keywords
mathematical reasoning ability, systems of linear equations and aplications.

Topic
Mathematics

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

Corresponding Author
Elsa Lisanti

Institutions
1 Universitas Negeri Jakarta (UNJ) Department of Biology, Faculty of Mathematics and Natural Sciences, Kampus A, Gedung Hasjim Asjarie Lt. 9. Jl. Rawamangun Muka Jakarta Timur, 13220, Indonesia

2 Center Application Isotopes and Radiation (CAIR), National Nuclear Energy Agency of Indonesia, Jalan Lebak Bulus Raya No. 49 Jakarta Selatan, Indonesia

Abstract
Introduction : The present study was carried out to evaluate of antihyperglycemia properties of ethanolic leaves and seed extracts of neem (Azadirachta indica A. Juss) on glucose level and body weight on mice induced alloxan. Methods : This experimental research uses DDY mice from BPOM Jakarta. The extract was tested on diabetic DDY mice induced by alloxan at a dose of 120 mg/kg bw intraperitoneal. There were 9 groups of treatment and 3 replications. Doses used for treating these mice were A. Normal mice + Aquadest (control), B. Diabetic mice + Aquadest, C. Diabetic mice + Glibenclamide, D. Diabetic mice + leaves extract of neem with doses 0,25 g/kg bw, E. Diabetic mice + leaves extract of neem with doses 0,50 g/kg bw, F. Diabetic mice + leaves extract of neem with doses 1,00 g/kg bw, G. Diabetic mice + seeds extract of neem with doses 0,25 g/kg bw, H. Diabetic mice + seeds extract of neem with doses 0,50 g/kg bw, I. Diabetic mice + seeds extract of neem with doses 1,00 g/kg bw. All of treatments were given orally for 21 days. Glucose levels were calculated from the 1st week to 11th week and body weights were calculated from the 1st week to 7th week. The data were analyzed by ANOVA and LSD tests to compare groups A-I. Result : the research showed that the ethanol extract of leaves at a dose of 1,00 g/kg bw decreased glucose level of alloxan mice. There were highly significant differences (P<0,05) between group control and treatment. Based on the data analysis of body weight, there was no significant difference between group control and treatment. Conclusion : Ethanol extract of leaves and seeds extract of neem can be used to treat antihyperglycemia on mice induced alloxan.

Keywords
antihyperglycemia, leaves and seeds, neem, ethanolic, mice

Topic
Biology

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

Corresponding Author
Lilis Widaningsih

Institutions
Universitas Pendidikan Indonesia

Abstract
Architecture is not just about physical entities of buildings, it is also about the space of human life and all its activities. This paper is a lesson learned gathered from field experience in assisting rural communities in building physical facilities and initiating various community activities. The method used is Participatory Action Research (PAR) which is oriented to the needs of the community, the research is conducted in Cibeureum Wetan Village, Cimalaka District, Sumedang Regency. Mentoring begins with the planning process, design and construction of public spaces i.e. buildings for childrens learning activities, which gradually being developed into various community activities from all age groups, especially women and adolescents. The participatory concept developed shows an increase in types of activities, strengthening social capital, productive economic activities and the growth of collective awareness to optimize public space as a joint activity space. The value of architecture in a broader meaning is indicated by the positive connectivity between space and its users.

Keywords
Community Architecture, Public Space, Community Education

Topic
Architecture

Link: https://ifory.id/abstract/26VfU8KXpwGg

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
Rahayu Kariadinata

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

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

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

Keywords
Wingeom Application, Spatial Ability, Mathematical Disposition

Topic
Mathematics

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

Corresponding Author
Sri Rahayu

Institutions
Universitas Negeri Jakarta

Abstract
Euchresta horsfieldii (Lesch.) Benn is one of the medicinal plants that grows in the highland forests of Bali. This plant is believed by the community as a powerful aphrodisiac. The study was begun with the collection of Euchresta horsfieldii (Lesch.) Leaf samples which will be extracted by maceration method. Three types of solvents were used in maceration namely aquades, 70% ethanol, and chloroform. Phytochemical screening includes testing of alkaloids, flavonoids, triterpenoids, steroids, phenolics, tannins, and saponins. The purpose of this study was to prove the effect of crude extract of Euchresta horsfieldii (Lesch.) leaves as aphrodisiac on the mounting behavior of male mice. The test parameters in this study are phytochemical screening and mounting behavior which consists of introducing, climbing, and coitus. The research design used was a completely randomized design (CRD) with two treatment groups and eight replications for eight days. The data obtained was analyzed through t test. Phytochemical screening results showed that 70% ethanol has the best ability to bind secondary metabolites in leaf samples, so that the extract with this solvent was tested in vivo on male mice. Based on observations on mounting behavior, it was shown that the crude extract of Euchresta horsfieldii leaves had no effect on the increase in frequency of mounting behavior of male mice in both the acute and chronic phases

Keywords
Euchresta horsfieldii (Lesch.) Benn, aphrodisiac, mounting behavior, male mice

Topic
Biology

Link: https://ifory.id/abstract/f6ubqWQaMjrH

Corresponding Author
Efri Sandi

Institutions
Department of Electrical Engineering, Universitas Negeri Jakarta
Jalan Rawamangun Muka Jakarta Timur, Indonesia 13220

Abstract
In this paper a parasitic radiator combination was developed to improve the gain performance and bandwidth of the S-Band frequency microstrip antenna. Previous studies focused on adding one side layer of the parasitic radiator and the same structure, so the idea emerged to develop a microstrip antenna by adding parasitic radiators from the two sides of the antenna radiator layer and the different structure of parasitic structure. In this paper, the design of the parasitic radiator is added by combining the circular parasitic radiator patch on the upper layer of the antenna radiator and the square parasitic radiator patch on the bottom layer of the antenna radiator. This study uses a research and development approach through the calculation of parasitic radiator structure and setting the distance between layers. Simulation and measurement results show that by adding a parasitic combination of radiators with a distance of 0.38 λ at the top layer and 0.15 λ at the bottom layer of the antenna, a better gain and bandwidth performance improvement is compared to the addition of parasitic radiator designs in previous studies.

Keywords
Double Layer, Circular Parasitic Radiator, Square Parasitic Radiator, Gain, Bandwidth.

Topic
Electronics Engineering

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

Corresponding Author
Yulia Sukmawardani

Institutions
Prodi Pendidikan Kimia, Fakultas Tarbiyah dan Keguruan UIN Sunan Gunung Djati Bandung

Abstract
This research is based on the needs for an innovative experimental learning media in the study of physical chemistry, focus on conductivity of electrolyte solutions. Through Research and Development with the stages of analysis, design and development, the electrolyte solution conductivity meter has been produced. Based on the results of the research, it was obtained the product in the form of an electrolyte solution conductivity measuring instrument equipped with a user guide to the use of an electrolyte solution conductivity measuring instrument and an experimental worksheet measuring the conductivity of an electrolyte solution. The electrolyte solution conductivity meter is designed to measure the conductivity of an electrolyte solution and can compare the conductivity values of fruit juices, vegetable juices and isotonic drinks quantitatively based on Kohlrauschs law with simple and easy tools and materials to obtain. Validation results indicate that the product is declared valid with the acquisition of an average value of R is 0.83. The results of the feasibility tests conducted on chemistry education students show that the electrolyte solution conductivity gauge is declared very feasible with an average value of 93.85%.

Keywords
Conductivity, electrolyte solutions,chemistry learning media , physical chemistry

Topic
Chemistry

Link: https://ifory.id/abstract/KHBdutYjy9z7

Corresponding Author
Sri Rahayu

Institutions
Universitas Negeri Jakarta

Abstract
. Flavonoids can be found in every organ of plants and has a role as natural antioxidant. The aim of this research was to investigate the influence of maceration and drying time to the level and the type of flavonoids from some leaves of plants located in Taman Wisata Alam Pangandaran. This research used CRD (Completely Randomized Design) with 2 factorial design. The first factor was soaking time of the plant extract in ethanol 96% for 24 hours and 48 hours, the second was drying time for 14 and 21 days. Sample used were Bungur (Largerstoremia speciosa L.), Mahoni (Swietenia macrophylla), Nyamplung (Calophyllum inophyllum L.), dan Vitex (Vitex pubescens Vahl.) leaves. Qualitative parameter was determined from the change of color of the solution used the reagent, as well quantitatively by spectrophotometer of 415nm. Flavonoid type was then analyzed using spectrophotometer at 250-560nm. Quantitative analysist of 2 ways ANOVA showed that all groups were shown significance influence of maceration and drying with optimum flavonoid level varying from one to another. Flavonid type was also ranging from antocyanidin and antocyanin.

Keywords
Drying, Maceration, Flavonoids, Antioxidant, Plant

Topic
Biology

Link: https://ifory.id/abstract/gDXjM4rKPp2Z

Corresponding Author
Khansa Ratri Haniya

Institutions
Universitas Pendidikan Indonesia
Dr. Setiabudi No. 229, Bandung 40154, Indonesia

Abstract
Each thermal generator has a fuel cost and heat rate that determines the economic aspects of a generator. To minimize the cost of operating the generator unit, optimization can be done using Economic Dispatch, so that the most optimal operating costs are achieved. In this study, the Augmented Lagrange-Hopfield Network (ALHN) method was used, where conventional Lagrange methods were combined with the Hopfield Neural Network method to accelerate the convergence process and obtain more optimal results. The results obtained indicate that the ALHN method can reduce generator unit operating costs with faster computational process than conventional Lagrange methods. Thus, the operating costs of the generation unit can be cut down.

Keywords
Optimization; Economic Dispatch; Augmented Lagrange-Hopfield Network; Hybrid

Topic
Electrical Engineering

Link: https://ifory.id/abstract/LyC4e7pFfxAB

Corresponding Author
Baso Maruddani

Institutions
Baso Maruddani (a,b*), Mufti Ma-sum (a), Efri Sandi (a), Tipla Daniati (c)
a) Engineering Faculty,Universitas Negeri Jakarta
Jalan Rawamangun Muka, Jakarta Timur 13220, Indonesia
*) basomaruddani[at]unj.ac.id
b) DJA Institute
Apartemen The Green Pramuka City, Tower Fagio
Jl. Jendral Ahmad Yani Kav. 49. Rawasari, Cempaka Putih, Jakarta Pusat 10570
c) Vocational High School 10
Jalan Servas, Jatimelati, Pondokmelati, Bekasi, West Java, 17415, Indonesia

Abstract
This study is aims to design a Low Noise Amplifier (LNA) with two stage cascade configuration at frequency of 2.4 -2.5 GHz. The transistor that used in this study has characteristic of high gain and low noise. The design is using microstrip line matching network with single stub technique to minimize parasitic effects. Transistor is using cascade configuration to produce high gain and improve the stability. The simulation results show that the LNA has reached all of expected specification at frequency of 2.45 GHz where S21, NF, S11, S22 are 30.693 dB, 1.248 dB, -70.358 dB and -72.982 dB, respectively; Also other values VSWR input, VSWR output, stability (K), input impedance and output impedance at 50Ω are 1.001, 1.0004, 5.280, 50.010 + j0.029 and 49.991 + j0.02, respectively. The measurement results show that at frequency of 2.45 GHz, LNA obtained value of S21, S11, S22, VSWR input, VSWR output are 22.17 dB, -4.117 dB, -13.049 dB, 4.297 and 1.572, respectively. Whereas, the best measurement of S21 is 24,05 dB at frequency of 2.05 GHz), S11 is -5.700 dB at frequency of 2.0 GHz , S22 is -27.570 dB at frequency of 2.045 GHz, VSWR input is 3.07 at frequency of 2,0 GHz and VSWR output is 1,09 at frequency of 2.045 GHz.

Keywords
LNA; Cascade; Voltage Divider, Mictrostip Line Matching Network, VNA

Topic
Electronics Engineering

Link: https://ifory.id/abstract/m9zfw7UvuZbA

Corresponding Author
Rismawati Ramdani

Institutions
UIN Sunan Gunung Djati Bandung

Abstract
Let G be a graph and k be a positive integer. A total k-labeling of G is a map f from vertex set union edge set of G to integers 1,2,3, until k. The vertex weight v under the labeling f is the sum of the label of v and the label of edges incident with v. A total k labeling of G is called vertex irregular if there are no two vertices with the same weight. The total vertex irregularity strength of G is the minimum k such that G has a vertex irregular total k-labeling. Let G and H be two connected graphs. Let o be a vertex of H . The comb product between G and H in the vertex o is a graph obtained by taking one copy of G and cardinality of G copies of H and grafting the i th copy of H at the vertex o to the i th vertex of G. In this paper, we determine the total vertex irregularity strength of come product of cycle and other graph.

Keywords
Comb product graph, cycle, the total vertex irregularity strength, total vertex irregular labeling.

Topic
Mathematics

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

Corresponding Author
Abdul Syukur

Institutions
*1 Postgraduate Program and Department of Sciences Education,
2 Faculty of Teacher Training and Education, Mataram University, Indonesia;
Jalan Majapahit No 56 Mataram Nusa Tenggra Barat; Phone: +62 370 623873
*12Corresponding author: Abdul Syukur - Email: syukurbiologi[at].unram.ac.id.

Abstract
Mangrove is a plant species that grow in a unique environment and serve as breeding, spawning, hatching, and nursery grounds for many marine species. However, the damage of mangrove has a negative impact on the diversity of fauna associated. This study aims to prove and evaluate mangrove replanting of fauna diversity on the South Coast of East Lombok.. Data collection were done through observation, surveys and quadrant methods The data were further analyzed to detemine Diversity Index (H) and Dominance Index (D). The analysis showed that the mangrove in Jor Bay has the highest index value of fauna diversity, is 2.762 and the lowest is Lungkak that is 2.146. The mangrove other locations such as Tanjung Luar have a value of fauna diversity index of 2,567, Kedome 2, 361 and Ekas Bay 2,457. However, the index value is highest dominance Ekas bay of 0.176 and the lowest was 0.097 Kedome. The conclusion of this study is that mangrove planting has been successful in increasing the diversity of fauna associated with mangroves on the south coast of East Lombok. Therefore, efforts to maintain the results of mangrove revegetation are a very important part of mangrove conservation.

Keywords
Replanting of Mangrove, Diversity of fauna and Maintenance of mangrove

Topic
Biology

Link: https://ifory.id/abstract/4tcmwgqAPV6r

Corresponding Author
Dwi Indrawati

Institutions
Environmental Engineering Department, Faculty of Landscape Architecture and Environmental Technology, Universitas Trisakti, Jakarta, Indonesia

Abstract
The research about illegal heap point of solid waste was conducted to identify the quantity of illegal solid waste heap point, to measure the volume and composition of solid waste along Segment 6 Ciliwung Riverbanks. That was done as a response to river pollution caused by solid waste. Calculations of the volume and compositions of solid waste was carried out for three days in five locations, namely riverbank in area of Manggarai (Location 1), Kebon Manggis (Location 2), Menteng (Location 3), Kwitang (Location 4), and Kebon Sirih (Location 5). The research shows that there is 22 illegal heap points of solid waste consisting of 93.38 m3 solid waste volume. The highest volume of the illegal heap point of solid waste was located in Kebon Manggis Area with 34.64 m3 and the lowest volume was located in Kebon Sirih Area with 1,53 m3. The average compositions of solid waste consisting of 45.56% organic waste and 54.44% non-organic waste with the highest percentage are the plastic waste 18.6% and the lowest percentage is rubber/leather waste 2.01%. The existence of the illegal heap point of solid waste in riverbank has the potential to decreasing water quality of Ciliwung River especially in Segment 6.

Keywords
riverbank, solid waste, heap point, volume, composition

Topic
Environmental Engineering

Link: https://ifory.id/abstract/gD4HWaCbAERY

Corresponding Author
Budi Lukman Hakim

Institutions
Sekolah Tinggi Teknologi Garut

Abstract
The oxide and nano ceramic system of Mullite-Magnesia-Yttria Stabilized Zirconia were studied. Some fracture toughness models were examined to evaluate crack length parameter whether comply with Palmqvist and median crack criteria at c/a ratio equal to 3.0. The mullite crystal structure was observed using SEM and looks likely needle, whereas 3YSZ crystal appears smoother. Through EDS analysis, it detected the oxides in Mullite system i.e. Al2O3, and SiO2. With similar method, some oxides were observed in the Mullite-Magnesia-3YSZ system such as MgO, Al2O3, SiO2, Y2O3 and ZrO2. With XRD analysis, nano MMZ system shows containing Al6Si2O13, Corundum (Al2O3), Zirconia (ZrO2), and Quartz (SiO2). Fracture toughness KIC of the ceramic composite of nano mullite-magnesia-zirconia complies with Palmqvist and median crack criteria. Nano ceramic particle shows higher value of hardness and fracture toughness while compared with oxide ceramic system.

Keywords
Fracture Toughness, Mullite, Nano ceramic composite, Yttria Stabilized Zirconia

Topic
Material Engineering

Link: https://ifory.id/abstract/wM2ucgWkyNer

Corresponding Author
Rina Febriana Hendrawan

Institutions
a) Technology and Vocational Education, Faculty of Engineering, Universitas Negeri Jakarta, Jakarta, Indonesia
*rinafebrianaunj[at]gmail.com
b) Technology and Vocational Education, Faculty of Engineering, Universitas Negeri Jakarta, Jakarta, Indonesia
c) Faculty of Engineering, Universitas Negeri Jakarta, Jakarta, Indonesia

Abstract
This study aims to develop learning media for craft and entrepreneurship subjects. After undergoing preliminary research on students needs for this particular subject, the authors consider technology-based learning media to needed in the process of learning carved sandals. This research was developed based on Borg and Galls research model as the main design, and ASSUREs instructional design as a sub-design in developing instructional media in the form of DVD (Digital Versatile Disc) entitled Tutorial Carved Sandals. Based on the results of the expert validation test it was concluded that the product was feasible to be used as a medium with a yield of 3.55 or 88.75%, and was very well used as a learning medium in large group trials with a return of 3.43 or 86%. This DVD has tested in 3 secondary schools in Central Jakarta in learning Crafts and Entrepreneurship in making handicraft products with the inspiration of non-objects culture.

Keywords
multimedia DVD, hand-carved sandal, ASSURE

Topic
Industry Engineering

Link: https://ifory.id/abstract/xZPWpuMzDw4R

Corresponding Author
Lia Kamelia

Institutions
Department of Electrical Engineering
UIN Sunan Gunung Djati Bandung

Abstract
The number of residential fires in urban areas is increasing every year. The use of automatic fire detection technology can prevent greater fire disaster losses. The fire detection system works by detecting increasing degrees of heat, ultraviolet radiation by flames, and gas leaks. The system will start automation if the LM35 Temperature sensor, MQ2 Gas sensor, and Light Dependent Resistor (LDR) detect the occurrence of fire according to the initial settings on Arduino Uno. After Arduino Uno processes input data from the sensor, there will be a notification notification marked with the Buzzer and a text will appear on the Liquid Crystal Display (LCD) that describes the condition of the sensor reading. Arduino Uno configures data via the GSM SIM900A Module. The last process is sending short messages (SMS) from the GSM SIM900A Module to the receiver to notify the initial warning of a fire. the delay time in testing the farthest distance (100 cm) is as follows: LM35 140 second Temperature Sensor, 130 second MQ2 Gas Sensor and LDR 145 seconds

Keywords
Fire detection; LDR ;LM 35;MQ2;SMS

Topic
Electrical Engineering

Link: https://ifory.id/abstract/WGAE9B4kyFpU

Corresponding Author
Yani Suryani

Institutions
Department of Biology
Faculty of Science and Technology
UIN Sunan Gunung Djati Bandung

Abstract
Recently, the national garlic productivity is very low because of pathogens, especially fungi. Efforts can be made to increase the productivity of garlic through the reduction and prevention of pathogenic attacks by using biological control agents. Microorganisms are one of the best biological agents. One type of microorganism is Trichoderma sp. This research was conducted at the Plant and Vegetable Research Institute (BALITSA) Bandung. The experimental design used was a completely randomized design with the type of treatment of garlic varieties. The varieties consist of varieties 1, 2 and 3. The parameters of the observations carried out in this study were the growth rate of garlic which included garlic height, root length and tuber garlic weight. Trichoderma sp. the optimal role is to increase the high rate of garlic plants by 0.8%, increase root length by 9 - 23%, and increase the weight of tuber weight by 21 - 51%.

Keywords
Trichoderma, Garlic, Biological Agent

Topic
Biology

Link: https://ifory.id/abstract/dFMWUzE6kbx3

Corresponding Author
DEDE ABD

Institutions
1. Study Program of Technological and Vocational Education, Universitas Pendidikan Indonesia. Jl. Dr. Setiabudhi no 229, Bandung, West Java, Indonesia.
2. Study Program of Information Engineering STMIK Pasim Sukabumi Jl.Otista No.07 Kota Sukabumi

Abstract
At present the trend of using Virtual Augmented Reality (VAR) technology in the field of vocational studies has become a very sexy and desirable research topic among industry. With its visual capabilities that can display objects in 3D, Virtual Augmented Reality can help many things, especially in training innovations in various industries. The development of VAR technology is quite fast and beforehand to feel this technology needed high-priced PC devices. Now, thanks to the progress of smartphones, VR and AR can be seen through these mobile devices. In this paper, the advantages and disadvantages of VAR are clearly described in terms of developing a three-dimensional virtual laboratory for innovation in vocational engineering learning. Unfortunately, some of the technical problems of VAR technology cannot be fully implemented into vocational engineering learning. The purpose of this paper is to show a study of the application of VAR technology with the literature review system method in the appropriate three-dimensional virtual laboratory framework. This analysis is carried out by screening a number of publications up to 30 major studies published from 2009 to 2018. The results show the low application of VAR technology in education and the increasing application of VAR in the industrial environment which leads to high complexity to select and develop vocational engineering learning with the VAR system. Subsequent research was also proposed to develop VAR in the interaction of user AR into a specific three-dimensional virtual laboratory of vocational techniques.

Keywords
TVET, Learning Innovation, Virtual Augmented Reality, 3D Laboratory, Computer Vision

Topic
Computer and Communication Engineering

Link: https://ifory.id/abstract/DpmEPZKL8qQJ