Indonesia Conference Directory

Corresponding Author
A.A GDE SATIA UTAMA

Institutions
a) Department of Accountancy, Economics and Business Faculty, Airlangga 4-6, Surabaya, 60286, Indonesia
*gde.agung[at]feb.unair.ac.id
b) Department of Accountancy, Economics and Business Faculty, Airlangga 4-6, Surabaya, 60286, Indonesia

Abstract
The rapid development of science and technology has an impact on the utilization of computers. Currently, the network can provide substantial benefits in all areas, especially in work activities. Hence the computer becomes an essential part of the company. An industry without computer technology will not be able to compete with its rivals. Computer technology has a significant role in the world of accounting for its ability in data processing, rapid calculation, grouping, as well as in producing accurate and fast output that will improve the companys performance. PT Petrokimia Gresik is a company engaged in the fertilizer industry. The company has used semi-computerized information system, but according to this case, it still needs the support of more reliable accounting information system. The company needs an adequate sales accounting information system to solve current problems including sales recording matter. The use of the computer in the process of selling transactions will speed up information construction. This study uses a qualitative approach with the scope of analysis focused on the analysis of accounting information system of non-subsidized fertilizer sales of PT Petrokimia Gresik. The type and sources of data used are primary and secondary data. Data collection procedures are a preliminary survey, literature study, and field survey. Analysis technique used is a descriptive case study. The objective of system analysis on the sales function in PT Petrokimia Gresik is to be abreast of the weaknesses and requirements of the system, and as a result, suggestions for the company improvement will be able to be given.

Keywords
Analysis; Sales Accounting Information System; Sales of fertilizer

Topic
Management Science

Link: https://ifory.id/abstract/JRznew738F2p

Corresponding Author
Ratri Ayu Rahmayanti

Institutions
a) Students of Civil Engineering Department, Faculty of Civil, Environmental & Geo Engineering, Sepuluh Nopember Institute of Technology
Jalan Raya ITS, Surabaya 60111, Indonesia
*ratriayu.pu[at]gmail.com
b) Civil Engineering Department, Faculty of Civil, Environmental & Geo Engineering,
Sepuluh Nopember Institute of Technology, Surabaya

Abstract
The Surabaya IV Regional Construction Services Center (BJKW IV) is an Organizational Unit under the Ministry of Public Works and Public Housing. One of the main tasks is the management of Non-Tax State Revenues. BJKW IV Surabaya has the assets of the Hall, Mess/Dormitory and Classrooms which can be used for internal activities and leased to private institutions related to construction services. However, the rental rates of the above building assets that are still used Government Regulation Number 38 of 2012 cannot meet operational and maintenance needs. This study aims to establish the latest rental rates that are able to meet operational and maintenance needs. In this paper, the analysis of rental rate determination uses the method of Activity Based Costing (ABC). The results show that the tariff requirements to meet operational and maintenance requirements are as follows: Hall rental rates is 1.15 times the original rate, Mess/Dormitory Rooms rental rates is 2,75 times the original rates, Large Classes rental rate is 2,25 times the original rates and the Small Class Room rental rate is 1,85 times the original rate. Based on the results above, BJKW IV Surabaya needs to consider tariffs for commercialization to the private sector.

Keywords
Calculation of Rental Charges, Non-Tax State Revenues Building, Activity Based Costing(ABC)

Topic
Civil Engineering

Link: https://ifory.id/abstract/PjBbAU2RZqrN

Corresponding Author
Arif Senja Fitrani

Institutions
Universitas Muhammadiyah Sidoarjo

Abstract
The concept of data mining in its implementation is used in handling and analyzing data in large capacity - steps to extract information and to gain knowledge in supporting decision making. Data mining, in its implementation, can be used in various sectors of data analysis, namely about the condition of the type of pension. The purpose of this study is to provide information, where a civil servant within the retirement limit is taken normally or earlier. The technique of using the classification method, with the decision tree C4.5 (J48), Naive Bayes and k Nearest Neighbor algorithm. Presentation of assets of 1,316 pension data in 2012 and 2013 from Bukopin Bank customers, which are divided into training data by 65% and data testing by 35%. From the testing of three algorithms, the highest classification was produced, namely Naive Bayes with 91%. The results of the three classifications indicate the quality of attribute determination can affect the results. And the predictive level of the three algorithms shows different results. For classification techniques with better results, improvements are needed to determine attributes and develop existing datasets

Keywords
Data Mining;Classification;Pension Data;Algorithm Classification;Classification;Comparative Analysis

Topic
Computer Science

Link: https://ifory.id/abstract/xCng4LkV92YX

Corresponding Author
Lutfi Nur

Institutions
Universitas Pendidikan Indonesia

Abstract
This study aims to analyze the comparison of the intensity of motion learning in male and female students through the use of polar global positioning system (GPS). The participants in this study were junior high school students. Comparative research used in this study. The instruments used were Polar GPS RC3 and Polar Heart Rate Sensor H3 to measure the pulse and distance of the students during learning. The results of this study are expected to be an evaluation material for teachers in an effort to improve the quality of the teaching and learning process.

Keywords
polar GPS, physical education, heart rate, distance, gender.

Topic
Sport Science and Technology

Link: https://ifory.id/abstract/Q8qyD74L9eCU

Corresponding Author
Puri Wijayanti

Institutions
(a) Program Studi Teknik Perminyakan, FTKE, Universitas Trisakti, Jakarta Barat 11440, Indonesia
*puri.wijayanti[at]trisakti.ac.id
(b) Program Studi Teknik Perminyakan, FTKE, Universitas Trisakti, Jakarta Barat 11440, Indonesia

Abstract
Quantitative analysis of reservoir properties in a well is determined by transient pressure analysis. Transient pressure according to its type consists of Pressure Build up and Pressure Draw Down. this analysis provides an overview of the characteristics of a reservoir. This analysis includes the process of determining drainage area, shape, heterogeneity, porosity, average pressure, skin, permeability, and distance from a reservoir to boundary or flow discontinuities. This test is to determine the ability of gas production in the PW-02 Well, carried out by using the Modified Isochronal test method. This test aims to determine the productivity of a potential (Absolute Open flow). Transient pressure test on PW-02 Well using the Pressure Build up Test (Type Curve Pressure Derivative) method, it is found that the well model is Vertical well and the reservoir model is Two porosity PSS. While the boundary model obtained is Rectangle. Then, the data obtained in the form of positive skin is 1.46, the permeability is 62.5 mD and the reservoir pressure is 2529.32 psia. Based on the analysis obtained Absolute Open Flow Potential (AOFP) of 117406 mscf/D. While the deliverability test value obtained is 117413 mscf/D with a n value of 0.825.

Keywords
AOFP, Pressure Build Up Test, Modified Isochronal Test, Well Testing, Derivative Pressure

Topic
Material Engineering

Link: https://ifory.id/abstract/r4PjpuFNwM9U

Corresponding Author
Endo Petakasari

Institutions
tudents of Civil Engineering Department, Faculty of Civil, Environmental & Geo Engineering, Sepuluh Nopember Institute of Technology Jalan Raya ITS, Surabaya 60111, Indonesia
* endo.petakasari[at]gmail.com
b) Civil Engineering Department, Faculty of Civil, Environmental & Geo Engineering, Sepuluh Nopember Institute of Technology

Abstract
Road preservation with a Long Segment Scheme is the handling of road maintenance within the boundary of one continuous segment (can be more than one segment) carried out by one contractor. The scope of outputs of the Long Segment Scheme is widening, reconstruction, rehabilitation and routine maintenance. The scheme certainly have advantages and disadvantages as well as influencing factors. The purpose of this study is to find out the dominant factors in the preservation of the Long Segment scheme. This research is a descriptive study, the research variable obtained from three stages of the implementation of road preservation, namely the procurement phase, handling phase and maintenance phase. This study used the interview method to experts who have been involved in the Long segment scheme. From the collected data, it is then analyzed using descriptive analysis. To find out the accuracy of the data, validity and reliability were tested using the SPSS program. To find out the dominant factors in the Long Segment scheme, mean analysis and factor analysis were carried out. The results of this study are to obtain the advantages and disadvantages of each stage of the implementation of the preservation of the Long Segment scheme.

Keywords
Long Segment Scheme, Road Preservation, Satker PJN Wilayah I Jawa Timur

Topic
Civil Engineering

Link: https://ifory.id/abstract/M6Pg4Yp8ytmL

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
Dyah Triwahyuningtyas

Institutions
Universitas Kanjuruhan Malang, Indonesia

Abstract
The development of online teaching materials technology makes it easier for students to study anywhere and anytime. In general, students still experience difficulties in understanding the material of the material in learning geometry. Therefore, the purpose of this study is to analyze geometry learning material in developing e-modules with an inquiry approach. This study applies the research and development method of Plomp in the preliminary research phase. The data analysis technique used is descriptive quantitative and qualitative data analysis. The results of this study are geometry learning material in elementary school teacher education students including material two-dimentional figure and space geometry. Geometry learning material that was previously used by students still gives the concept in finished form, so students only memorize in understanding the concept. Implementation of the results of the material analysis will be developed teaching materials in the form of e-modules for learning geometry with the inquiry approach.

Keywords
E-module, Inquiry, Two-Dimentional Figure

Topic
Mathematics

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

Corresponding Author
Trias Megayanti

Institutions
Universitas Pendidikan Indonesia

Abstract
Green open space performs an important role to enhance the quality of community living as well as being beneficial in maintaining the ecosystem. It is also having a prominent role in disaster risk management applied to densely populated settlements. Nevertheless, social awareness about the essential role and utilization of green open space is still a concern. The aim of this paper is to deliberate the result of the river banks potential analysis that serves as a green open space and communal space. This study is conducted by the Participatory Rural Appraisal (PRA) methods, which was carried out in collaboration with the local community group, to asses the potency of green open space at Negeri kaler Village, Purwakarta Regency, Indonesia. The result shows that community empowerment in optimizing public space, requires a critical awareness process for the local community to maintain environmental sustainability and social interaction. It is also shows the mapping of green open space at the village. The results from this study is being used as guidelines for designing green open spaces with community architecture methods based on the needs of the local community.

Keywords
green open space, community architecture, communal space

Topic
Architecture

Link: https://ifory.id/abstract/f4BabdMeyuHX

Corresponding Author
Vivi Peggie Rantung

Institutions
a) Department of Informatics, Universities Negeri Manado
Kampus UNIMA Tondano, Tondano 95618, Indonesia
*vivirantung[at]unima.ac.d
b) Department of Information and Technology Education, Universities Negeri Manado
Kampus UNIMA Tondano, Tondano 95618, Indonesia

Abstract
The purpose of this study is to analyze Executive Information System (EIS) that suits the need of the executive level in higher education. To achieve these specific targets, the FAST method was used. We focus the analysis phase in Manado state university. The final result of this study is an EIS process model that will use for design a web-based application that providing flexible facilities for executives (Rector) in accessing external and internal information that is useful to identify problems in internal decision making.

Keywords
executive information system, FAST method, higher education management, information system

Topic
Computer and Communication Engineering

Link: https://ifory.id/abstract/62qcaVeBvFdp

Corresponding Author
Eko Walujodjati

Institutions
Sekolah Tinggi Teknologi Garut, Program Studi Teknik Sipil, Jl. Mayor syamsu no 1 jayaraga Garut, eko.walujodjati[at]sttgarut.ac.id

Abstract
Technoplex Living Apartment Bandung is one of the buildings using a shear wall that is built in earthquake-prone areas. This study analyzes the CW3 shear wall Type which aims to determine the seismic load plan using spectrum response analysis that is applied and analyzed on the structure of the building so that the horizontal deviation value that will be compared against the value of horizontal deviation that is permitted under SNI 1726 of 2012 is obtained. The results of this study can be concluded that the CW3 shear wall produces the highest horizontal deviation value in the direction of X of 0.032 m greater than the highest horizontal deviation value in the direction Y of 0.0042 m. Because it was analyzed in one direction, namely the X direction with the percentage of seismic load received using an orthogonal system where the X direction building structure received an earthquake load of 100% while the Y direction of 30% from the earthquake load was calculated by the spectrum response analysis method and the resulting horizontal deviation was below the allowable safety margin, the percentage of X direction is 56.7% while Y direction is 92.3%.

Keywords
Earthquake Load Design, Horizontal Deviation Value, Shear Wall, Building Structures

Topic
Civil Engineering

Link: https://ifory.id/abstract/atH2y3QAbB8m

Corresponding Author
Tazkiaturrizki Tazkiaturrizki

Institutions
Environmental Engineering Departement, Faculty of Landscape Architecture and Environmental Technology, Universitas Trisakti, Jalan Kyai Tapa No.1, West Jakarta, Indonesia
*tazkiaturrizki13[at]trisakti.ac.id

Abstract
Sanitary landfill activities produce leachate that contain of high pollutant wastewater from the solid waste. Anaerobic Fluidized Bed Reactor (AnFBR) is one of technology that able to treat wastewater with high pollutant. This study has purpose to analize the effect of hydraulic retention time (12, 24, 36, and 48 hours ) on the leachate treatment using AnFBR. The leachate collect from TPA Rawa Kucing that has characteristics of COD 5200-5500 mg/L and BOD 2000-2500 mg/L. Seeding and acclimatization is the first method to get the biomass of anaerobic sludge without oxygen supply. During the process, nutrient for the biomass was maintained by giving additional nutrient of glucose 33%, sanitary landfill sludge filtrate 5% and 33% of leachate and 28.3% chlorine-free water at the first formula. The second formula is by mix the glucose 20%, sanitary landfill sludge filtrate 6% and 40% of leachate and 28.3% chlorine-free water, and it tooks 3 months. The results is optimum variations of hydraulic ratention time is 48 hours, to remove BOD, COD, and TSS at 78%, 92% and 22% efficiencies. The degradation rate of the substrate (k) in Anaerobic Fluidized Bed Reactor is 0.73 day-1.

Keywords
leachate, AnFBR, hydraulic retention time, degradation rate

Topic
Environmental Engineering

Link: https://ifory.id/abstract/7cU4erQpt6P3

Corresponding Author
Masta Hutajulu

Institutions
a)Postgraduat Departement of Mathematics Education, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudhi 229, Bandung 40154, Indonesia
b)Departement of Mathematics Education, IKIP Siliwangi, Jl. Terusan Jenderal Sudirman, Cimahi 40526, Indonesia
* masthahutajulu[at]student.upi.edu

Abstract
Abstract. This study aims to analyze the achievement of each indicators habits of mind (HoM) senior high school students. The research method used is descriptive. The population in this study were high school students in the city of Bandung. The sample was chosen by 1 class consisting of 31 students. The instrument used was the Habits of Mind questionnaire. The results showed that the habits of mind of senior high school students were positive for the 16 indicators and were at moderate to high levels. This study can be recommended to improve the habits of mind (HoM) senior high school students.

Keywords
Habits of mind, indicators

Topic
Mathematics

Link: https://ifory.id/abstract/mLQRrW7X6NA3

Corresponding Author
Danil Efsya Putra

Institutions
Pendidikan Teknik Elektro, Universitas Pendidikan Indonesia
Jalan Dr. Setiabudhi No. 229, Bandung 40154, Indonesia

Abstract
Internet has an important role in the development of education as a medium of information and learning media for students and teachers. The use of Internet as an information medium needs to be maximized as much as possible. School and job-related information are also needed by many parties. Therefore, it is necessary to have an information system in the form of website to support the need of those works. This research was conducted to analyze industrial relations information system availability on state vocational high school websites in West Java Province. The method used is content analysis and survey. Content analysis includes reviewing website content by general categories (industrial relations content, school contact content, job information content, job information update content, direct content to the company website and information of partnership content). Survey includes direct observation of the website in order to find and obtain data regarding industrial relations information systems availability on the school website which will be examined. The object in this research is the state vocational high school website in West Java Province. The findings of this research were found that most schools still ignore the availability of websites, especially the distribution of job vacancy information.

Keywords
school websites; industrial relations information system; vocational high school

Topic
Information Engineering

Link: https://ifory.id/abstract/mzekfyhTgGA3

Corresponding Author
Mujiarto Mujiarto

Institutions
a) Postgraduate Students, Department of Mechanical Engineering, Institut Sains dan Teknologi Nasional, Jl.Moh Kahfi II Srengseng Sawah Jagakarsa, Jakarta Selatan 1264, Indonesia
*wilarso09[at]gmail.com
b) Department of Mechanical Engineering, Institut Sains dan Teknologi Nasional, Jl.Moh Kahfi II Srengseng Sawah Jagakarsa, Jakarta Selatan 1264, Indonesia
c) Department of Mechanical Engineering, Universitas Muhammadiyah Tasikmalaya, Jl. Tamansari Km. 2,5, Mulyasari, Tamansari, Tasikmalaya 46196, Indonesia
*mujiarto[at]umtas.ac.id

Abstract
Diesel Engine in Ampenan PLTD which is operated by PT. X has damaged the injector spring in cylinder

Keywords
Diesel engine; Exhaust manifold; Glowing; Injector spring; Maintenance management

Topic
Material Engineering

Link: https://ifory.id/abstract/38jX4fA7DBFw

Corresponding Author
Budi Lukman Hakim

Institutions
Sekolah Tinggi Teknologi Garut

Abstract
Jacket pile is a corrosion protection system that is applied to ASTM 252 steel piles in the tidal and splash zone area of the Jetty. In this system the vessel is leaning on the breasting dolphin (BD). There has been damage to 9 new pile jackets installed and operated for several days in February 2018 on BD. damage occurs in the front position of the pneumatic fender direction of the vessel leaning. analysis is carried out using observation, inspection and simulation methods. the results of the analysis of the causes of damage to the jacket pile is due to vertical collisions and loads from the pneumatic fender. the visual simulation it can be predicted that when the ship rests near BD, the backrest will be held by a pneumatic fender, so that the floating fender will pound and press the pile jacket with mashing energy of 13.88 t.m, both in a shock, swing perpendicular and vertical to the pile BD. To prevent the recurrence of similar cases, it is recommended to use a BD Guard to protect the pile and jacket pile of BD from direct collisions and friction from pneumatic fenders and barges.

Keywords
Breasting Dolphin, Corrosion Protection, Failure Analysis, Jacket Pile, Jetty

Topic
Material Engineering

Link: https://ifory.id/abstract/cdwAKjpu26xZ

Corresponding Author
Cahyadi Setiawan

Institutions
Universitas Negeri Jakarta, Faculty of Social Science, Program Study of Geographic Education. Jakarta, Indonesia.
cahyadi-setiawan[at]unj.ac.id

Abstract
After hundreds of years experiencing a dormant period, Mount Sinabung erupted again in August 2010 to the last recorded in June 2018. Within eight years, significant land cover changes were seen in the area around Mount Sinabung. This study aims to analyze changes in affected areas using satellite imagery. The spatial analysis method is used to determine changes in various land cover. High-resolution images before the 2010 eruption and the latest recording images of 2019 are used as analytical material. The analysis shows that the affected area is in east-southeast and south-southeast directions of the peak of Mount Sinabung. In the east-southeast direction, the eruption material reaches 3.5 km and 4 km in the south-southeast with an area more than eleven thousand hectares. Some villages such as Bekerah, Simacem, and Suka Meriah have even been lost covered by material from the eruption of Mount Sinabung. The area is generally covered by pyroclastic materials in the form of ash, sand, lapilli, and bombs. Most of the areas affected by the eruption are plantation areas, then forest areas and settlements areas. Sinabung Eruption in recent years has had a very significant impact on various aspects, one of which is land cover.

Keywords
Sinabung Volcano; Land Cover Change; Satellite Imagery

Topic
Environmental Engineering

Link: https://ifory.id/abstract/kHfZdBqT3xF7

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
Rositayanti Hadisoebroto

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

Abstract
In general, chicken slaughterhouses have capacity of slaughtering more than 40.000 chickens per day so it generates a high wastewater. One of appropriate treatments is Granular Aerobic Sludge in Sequencing Batch Reactor (GAS-SBR) since wastewater from chicken slaughterhouse has high BOD and COD in fluctuation. The purpose of this research is to analyze the reactor system ability to decrease parameters of BOD, COD, TSS, and ammonia on wastewater. In this research, the concentration variations were 6406.4 mg/L (100%) as initial concentration, 4804,8 mg/L (75%) and 2303,2 mg/L (50%). With 4 hour aeration time, the highest BOD removal with 100% load is 56.25% and an effluent is 1400 mg/L; COD is 75% removed with effluent of 768 mg/L at 50% load; TSS is 36.73% removed with effluent 1.79 mg/L at 100% load; while for Ammonia is 67.91% with 1.11 mg/L at 75% load. The parameters of TSS and ammonia have meet the quality standard of Environmental Ministry Decree no.5, 2014 for slaughterhouses wastewater, while BOD and COD parameters are steel exceeding the standards. The GAS-SBR could remove BOD and TSS parameters from highest concentration load, while ammonia and COD parameters could remove in influent concentration load diluted.

Keywords
chicken slaughterhouse wastewater, granular aerobic sludge, sequencing batch reactor, concentration load

Topic
Environmental Engineering

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

Corresponding Author
Ratna Widyati

Institutions
Universitas Negeri Jakarta

Abstract
This study focuses on analyzing the theses of Mathematics Education Study Program students who are Design Research (DR) types. Thesis is analyzed with the aim to see the relationship between mathematics learning material with the characteristics of Realistic Mathematics Education. DR is a quite complex qualitative research and requires precision and creativity in preparing realistic mathematics learning. The emphasis of DR is on the process of delivering subject by teachers to students and the resulting product in the form of learning design which is part of the Hypothesis Learning Trajectory. Relational analysis in this study is in the form of error analysis as an effort to observe and describe deviations between mathematical concepts to be taught to students with mathematical contextual material to be appointed in research for every mathematical material that is described as human activity. Relational understanding produces conceptual knowledge, allows students to solve mathematical problems conceptually and can explain the strategies and steps used. From 36 DR theses, there are some learning materials which is felt to be very contextually forced, so that relational understanding is not achieved. But if it is right, not only acheived relational understanding, but also students mathematics learning outcomes increased.

Keywords
Design Research Error Analysis, Relational Understanding, Characteristics of Realtistic Mathematics Education

Topic
Mathematics

Link: https://ifory.id/abstract/TMNUgtCEXb9Y

Corresponding Author
Sugiyanto -

Institutions
Technological and Vocational Education Programs Graduate School, Universitas Pendidikan Indonesia.
Jl. Dr. Setiabudhi no 229, Bandung, West Java, Indonesia.
Corresponding author : agus_setiawan[at]upi.edu

Abstract
The development of applications on smartphone devices might be potential to help improving teaching and learning process. The research analyzes IT infrastructure and preparedness in mobile learning and project based learning (PjBL) integration of vocational education. The research data was collected by questionnaires from 100 students of the tenth grader in a computer and network engineering program of the vocational school. The results of the research show that the IT device which owned by the school has been qualified for implementating mobile learning and project based learning (PjBL). The research also found that there was preparedness from students to participate actively in learning process by using mobile learning and Poject based learning (PjBL) integration model that was carried out digitally (online based), so that teachers could implement learning scenarios by using records learning to upload and access online, whenever and wherever by students and teachers who are monitored and evaluated in real time through the system. The mobile application as an interface that is accessed by using information technology devices such as smarthphones, netbooks, personal computers through internet/intranet network media by data sources of various digital documents learning in documents files, pdfs, videos, presentations and images stored in the cloud suitable the syntax project based learning based on basic competencies that must be achieved by students with certain spectrum in learning which includes the achievement of three competence elements, there are affective, cognitive and psychomotor.

Keywords
Mobile Learning, Project Based Learning, Vocational Education

Topic
Information Engineering

Link: https://ifory.id/abstract/NQJFgAbZTfG4

Corresponding Author
ibnu hadi

Institutions
a) Faculty of Mathematics and Natural Science, Universitas Negeri Jakarta, Jalan Rawamangun Muka, Jakarta 13220, Indonesia
*ibnu_unj[at]yahoo.co.id

Abstract
A set of matrices integers modulo prime can form a finite group. This group has trivial and non-trivial subgroups. The trivial subgroup is normal clearly and for a non-trivial subgroup the normal properties will be investigated. Furthermore, if a non-trivial subgroup is a normal subgroup, then a quotient subgroup can be constructed. This paper discusses the characteristics of normality of quotient subgroup on matrices integers modulo prime. A group is constructed by matrices integers modulo prime. Here we considered some properties of this group. The order of group play an important role in this quotient subgroup. By this concept, we derive some result of normality of quotient subgroup. From this paper, it was found that the subgroup order had an effect on the normality of a quotient subgroup.

Keywords
Order of Group, Normality of Quotient Subgroup, Matrices Integers Modulo Prime

Topic
Mathematics

Link: https://ifory.id/abstract/A2PKpWwvQDrZ

Corresponding Author
Athaya Zhafirah

Institutions
a) Department of Civil Engineering, Sekolah Tinggi Teknologi Garut, Jalan Mayor Syamsu 1, Garut 44151, Indonesia
*athaya[at]sttgarut.ac.id
b) Department of Civil Engineering, Politeknik Negeri Bandung, Jalan Gegerkalong Hilir, Bandung 40559, Indonesia

Abstract
Consolidation settlement in clay soils can be predicted by analyzing the consolidation parameters. Consolidation parameters were obtained from the results of a laboratory consolidation test using an Oedometer and Rowe cell. The Rowe cell can measure pore water pressure, soil saturation, and back pressure as a simulation of field condition while the Oedometer cannot. However, there are significant differences between the results of the analysis with the consolidation settlement occurred in the field caused by drainage conditions, the micro characteristics of the soil structure, and the thickness of the soil layer. Therefore, it is necessary to validate the results of settlement in oedometer and Rowe cell consolidation analysis with the value of settlement of experimental results. The method used is a laboratory consolidation test using an Oedometer and Rowe cell as well as a laboratory-scale experimental consolidation test. The results obtain 79% of differences between experimental and Oedometer, while Rowe cell had a difference of 37% from experimental. Based on this, analysis using Rowe cell consolidation parameters can predict a settlement in consolidation in the field more accurately than Oedometer, because it has a smaller difference in value.

Keywords
clay, consolidation, oedometer, rowe cell, experimental

Topic
Civil Engineering

Link: https://ifory.id/abstract/CjBa3M7FT9Du

Corresponding Author
Erlin Susanti

Institutions
Department of Civil Engineering, Faculty of
Civil, Environmental, and Geo Engineering,
Sepuluh Nopember Institute of Technology
(ITS) Surabaya
Indonesia

Abstract
Reservoir is a water resource facility that has a function as a storage and water provider. The abundant water in the rainy season is accommodated, stored and used appropriately throughout the year. The fact that is happening now as time goes by is that many reservoirs in Indonesia have decreased function and performance. One of them occurs in the Bajulmati Reservoir located in Banyuwangi and Situbondo districts, East Java. The decrease was due to the planning of the reservoir that was not in accordance with the current conditions. This study aims to analyze the Operating Pattern of Bajulmati Reservoir so that the reservoir is expected to provide optimal performance in utilization for irrigation, raw water and Micro Hydro Power Plants. This research was conducted by analyzing data for the availability and utilization of Bajulmati Reservoir water, stretching the discharge of reservoir inflow in the future for 50 years, forming a model with Dynamic Programming and simulation. The first simulation was carried out according to the operation of the current reservoir, which is prioritized for irrigation (factor kT = 100% with differences in how to calculate irrigation water requirements), irrigation water is passed through a turbine (PLTMH). In the second simulation, the reservoir was operated with the fulfillment of irrigation and raw water, a factor of kT> 70% and the Micro Hydro Power was optimized considering the availability of water in the reservoir. The simulation results show the operation of the reservoir in producing electricity on average per year if the turbine must be fully operational and if a turbine with a 20% maximum power already operate with a percentage of the fulfillment of irrigation and raw water (factor kT). From the analysis of income (without taking into account the cost and assuming the provision of irrigation water and raw water are performed simultaneously) are known to be the highest income and lowest income.

Keywords
Reservoir, optimization, dynamic programming

Topic
Civil Engineering

Link: https://ifory.id/abstract/4kGcF9yYpPdT

Corresponding Author
Diana Irvindiaty Hendrawan

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

*Corresponding author: dianahendrawan[at]trisakti.ac.id

Abstract
Greywater from domestic activities on the riverbanks settlement in Indonesia usually channeled directly to the drainage or to the river. It will be decrease the water quality. The aims of the research are to analyze the pollutant load due to greywater from settlement in banks of Ciliwung River segment 2 and responses of society sanitation habits. The research was conducted at 6 villages are Babakan Pasar, Sukasari, Baranangsiang, Cibuluh, Kedung Badak, and Sempur. Water samples were taken from the drainage channel in the morning and evening, which are considered to represent the peak hours of greywater. Sampling was conducted in May, June and July 2018. Pollutant load based on BOD level in the drainage channel ranges from 4,903.19-132,804.33 kg/day. This condition shows the high tendency of pollution due to greywater domestic activities and absence of greywater treatment in residential areas. Almost 50% of the community understand the importance of the need for wastewater management. Community awarness for sanitation habits such as environment community service, maintenance and handling waste in drainage, periodic septic tank desludging, and greywater disposal to drainage are needed. The conclusion is that greywater treatment in riverbanks settlement is really needed to be applied.

Keywords
Domestic activities; greywater; riverbank settlement; sanitation habits; pollutant load

Topic
Environmental Engineering

Link: https://ifory.id/abstract/QNKfXncF6mdz

Corresponding Author
Soeprijanto Soeprijanto

Institutions
Faculty of Engineering, Universitas Negeri Jakarta, Jakarta, Indonesia

Abstract
This study aims to describe the level of digital literacy, career plans and student achievements and analyze the extent of the relationship between variable digital literacy variables, and career plans with learning achievement. The research method used is descriptive correlational. The problems raised in this study are whether there is a relationship between the relationship between digital literacy variables, career plans both in the same way as together, together with student achievement. The study population was students of the Faculty of Engineering, Jakarta State University, the study sample was taken by stratified random sampling. The results showed that the digital literacy of UNJ Faculty of Engineering students was good. The results of the calculation of partial correlation between variables in the significance of 0.05 as follows: (1) between digital literacy (X1) and student achievement (Y) obtained r14 = 0.066. (T count = 2.208 ≥ T table = 1.98), and (2) between digital Career Planning (X3) and Student Learning Achievement (Y) obtained a value of r34 = 0.308 (T count = 3.488 greater than T table = 1, 98). The conclusions of this study are as follows: (1) There is a significant relationship between digital literature and student achievement; (2) There is a significant relationship between Career planning and student achievement. (4). There is a varied relationship between digital literacy, career planning between study programs in the environment, Faculty of Engineering, Jakarta State University. The implication of the findings in this research is that the software study program ensures that all students master information technology and have a clear career planning.

Keywords
Keywords: Digital literacy, information technology. carreer planning, student achievement.

Topic
Computer and Communication Engineering

Link: https://ifory.id/abstract/rL7pRaDy2X6f

Corresponding Author
Lia Kamelia

Institutions
Faculty of Science and Technology
UIN Sunan Gunung Djati Bandung

Abstract
Sound wave technology or Sonic Bloom technology has long been applied to plants. Sound waves affected the plants at different frequencies, sound pressure levels, presentation periods, and distances from sound sources. The aim of this research is to determine the effect of sound technology exposure on certain frequencies on the beginning of shoot growth, plantlet height, leaf number, and stomata opening width . The experiment was conducted by comparing chrysanthemum plants exposed to quran recitation (Surah Al-Fatihah) at an average frequency of 1237.8 Hz for 2 hours for 8 Weeks After Culture (WAC). The results showed that murattal and media interactions occurred in planlet height after 4 WAC and leaf number after 8 WAC. The exposure of murattal had affected on plantlet height after 2 WAC. The treatment influenced the number of leaves after 4 WAC, and the number of roots after 6 WAC. In testing the opening of the stomata, the leaves that given murattal al-Fatihah treatment, having a stomata opening wider than the leaves that were not treated (control). This study is the beginning of research to find the right frequency to stimulate growth in plants.

Keywords
Chrysanthemum Sp.;Frequency;Growth;Quran recitation;

Topic
Biology

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

Corresponding Author
TASMA SUCITA

Institutions
Departemen Pendidikan Teknik Elektro
Universitas Pendidikan Indonesia

Abstract
The purpose of this study was to determine the effect of generator installation Distribution of stability on a system of 20 kV distribution with load conditions is considered balanced. The reason for conducting this research is to find out how far DG can maintain stability on each bus. The method used in this study is to compare the results of the simulation of power flow and short circuit interference using ETAP Power System software. The results obtained from the power flow simulation before installation DG voltage drop at the end of the line. While the three phase short circuit fault current before the DG installation at the beginning of the line is x. After installation of DG with an injection of 50% and 90% power DG obtained a voltage drop at the end of the line of y and w. The results of the study show that with the injection of DG can increase the voltage profile on the line. Likewise, the interference current has increased, but it can be overcome by placing the location of the DG from the fault site.

Keywords
Distribution line, Distributed Generation, Stability of Distribution Systems, ETAP Power System

Topic
Electrical Engineering

Link: https://ifory.id/abstract/rJcLQe63WBmz

Corresponding Author
Andi Candra Septaprasetya

Institutions
a) Students of Civil Engineering Department, Faculty of Civil, Enviromental & Geo Engineering, Institut Teknologi Sepuluh Nopember (ITS), Sukolilo,
Surabaya 60111, Indonesia
*bearelits42[at]gmail.com
b) Civil Engineering Department, Faculty of Civil, Enviromental & Geo Engineering, Institut Teknologi Sepuluh Nopember (ITS), Sukolilo,
Surabaya 60111, Indonesia
c) Statistics Department, Faculty of Matematics, Computation, and Data Science, Institut Teknologi Sepuluh Nopember (ITS), Sukolilo,
Surabaya 60111, Indonesia

Abstract
Most of Surabaya area is lowland, which is 80.72% with an altitude between 3-8 meter above sea level with a slope of less than 3%. Therefore, the city drainage system requires pump station operations to drain rainwater. One of the factors that can hinder the performance of pump stations in flood management is the damage to the drainage pump unit. This study has succeeded in finding motor damage as the type of dominant damage at drainage pump in Surabaya. The analysis of the types of dominant damage using the Analytical Hierarchy Process (AHP) by determining the type of dominant damage as the objective in the first level hierarchy, the dominant damage criteria are at the second level, and the types of damage are at the third level as an alternative decision. The types of damage are obtained by processing historical data of pump damage in 2017 to 2018, while the criteria for determining the dominant type of damage and the assessment in the AHP analysis are obtained from interviews and questionnaire with experts from the Surabaya city government and pump companies. The results of this study can be used to find the dominant causes of damage and forms of mitigation.

Keywords
Drainage, Pump Station, Dominant Damage Type, Multi Criteria Decision, AHP

Topic
Civil Engineering

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

Corresponding Author
Puradwi Ismu Wahyono

Institutions
CENTER for ACCELERATOR SCIENCE AND TECHNOLOGY, NATIONAL NUCLEAR ENERGY AGENCY

Abstract
ABSTRACT: Subcritical Assembly for Molybdenum Production (SAMOP) is a concept of nuclear reactor where the neutron multiplication factor (k-eff) less than one (k-eff ~ 0.99). Therefore, SAMOP reactor need an external neutron source for its operation. Uranyl Nitrate Hexahydrate, UO2(NO3)2or UN is used as fuel as well as target material for Mo-99 production.The Mo-99 isotope is used to generate Tc-99m which is the most widely radioisotopesused for diagnostic in nuclear medical fields. The composition of Uranyl Nitrate Hexahydrate (UNH)should be analyzed to achieve the required subcriticallevel in the SAMOP corei.e. k-eff ~ 0.99. Methodology for this analysis is a calculation of subcritical level of SAMOP by using WIMSDcomputer code. Using enrichment of uranium of 19.75% with 2.81 gr/cc of density, the composition shown 0.251724 for U and 0.748276 forN,O and H. The composition is then used as input for the neutronic analysis using the ORIGEN computer code as well as calculation of neutron source and thermal power of SAMOP. The result shows that the optimum k-eff is 0.9919 with the composition of U-235, U-238, N, O, H, U, N-O-H are 0.049715, 0.202009, 0.053448, 0.374138, 0.32069, 0.251724, and 0.748276 respectively.

Keywords
Uranyl Nitrat, Subcritical Assembly

Topic
Physics

Link: https://ifory.id/abstract/D6Ga2EhQnfAJ