Indonesia Conference Directory

Corresponding Author
Tri Nopi Yanti

Institutions
a) University of Lampung, Lampung
*trinopiyanti30[at]gmail.com
b) Marine Geological Institute, Bandung

Abstract
Comprehensive characterizarion methods are carried out to determine accurate source rock and reservoir identification. Geochemical data has become a critical part of recent unconventional exploration and development. However, due to high cost of geological core extraction and analysis, geophysical wireline logging tools have become the primary source of downhole measurement of geomechanical properties. This study covers an integrated approach at defining geochemical report derived from geological core extraction and analysis and its relationship with geophysical wireline logs of 5 (five) wells at Northeast Java Basin. Wireline logs can be used to identify reservoir and source rock intervals in the primary stage of well drilling. However, the well logs that directly measure the hidrogen content of the kerogen do no exist. Consequently, it used for source rock evaluations and calculation of Total Organic Carbon (TOC) most commonly include sonic, density, gamma ray, neutron, and resistivity. The Van Krevelen diagram has been applied to all 5 (five) wells that indicates 2 (two) of them have potential gas – kerogen type III/IV with marginally mature to mature source rock. The integration of well logs and geochemical data greatly improves the accuracy and understanding of the controls of reservoir quality and source rock. It can be used for further step of knowing basin potential and its prospect level.

Keywords
well log analysis; geochemical data; Total Organic Carbon; Northeast Java Basin

Topic
Geophysics,Geomatics and Geochemistry

Link: https://ifory.id/abstract/7umXR6aPZWK9

Corresponding Author
Andiny Widya Utari

Institutions
School of Environmental Science Universitas Indonesia, Jl. Salemba Raya No. 4 Central Jakarta 10430, Indonesia

Abstract
Indonesia, as one of the largest population country, faces a problem with the availability of clean water. The increasing of the population every year results in the increasing of clean water needed. It also causes the increase of wastewater, especially domestic wastewater. As one of domestic wastewater, household wastewater in Indonesia, especially DKI Jakarta, is one of the main cause of river pollution. Household wastewater disposed directly into the river. Chemical Oxygen Demand (COD) and Total Suspended Solid (TSS) are some substances contained in it. Therefore, it is necessary to manage the wastewater before the disposal. Filtration processing is one of the wastewater treatment method used to reduce the pollutant level in the water. The materials are able to reduce the concentration of COD and TSS. This study aims to verify if filtration can be used as a method to reduce household wastewater by the study of literature. Besides, the researcher also used other materials to process sample from household wastewater. Filtration can be used as a simple method, so that it can be applied by the community, especially those not covered by wastewater treatment plant (WWTP).

Keywords
COD, filtration, household, TSS, wastewater

Topic
Disaster Management and Environmental Issues

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

Corresponding Author
Donna Asteria

Institutions
1Communication Department, Faculty of Social and Political Science, Universitas Indonesia, Jl. Prof. Dr. Selo Soemardjan, Depok, 16424 Indonesia
2 Faculty of Health Science, Universitas Pembangunan Nasional Veteran, Limo, Kota Depok, 16515, Indonesia
3School of Environmental Science Universitas Indonesia, Jl. Salemba Raya No. 4 Central Jakarta 10430, Indonesia

Abstract
This paper aims to describe the strategic role of women through empowerment to improve post-disaster adaptability in the city. City resilience is an important condition to be achieved after a disaster occurs to support the realization of a friendly city for women and children. Empowerment efforts will increase the participation of women in the community because women have a strategic role in post-disaster environmental management. This study uses a quantitative approach with analytical techniques use AHP (Analytical Hierarchy Process) and descriptive statistics. This method with by utilized expert judgment from various stakeholders to predict approach for the development of more sustainable empowerment . The results of the study show that the development of empowerment with a gender equality approach through efforts to improve the ability of economic productivity can improve the adaptive capacity of women facing post-disaster. The important suporting for women are access and opportunities in the recovery and preservation of post-disaster environments in their communities. The contribution of this study as the development of disaster management and post-disaster policy planning in urban areas uses the approach of gender equality and community-based participation.

Keywords
urban resilience, womens capabilities, community participation, post-disaster adaptation, empowerment

Topic
Disaster Management and Environmental Issues

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

Corresponding Author
Muhammad Rahman Yulianto

Institutions
UPN "Veteran" Yogyakarta

Abstract
The stability of rock slopes is important for the safety of personnel and equipment in the open pit mine. Slope instability and failure occur due to many factors such as adverse slope geometry, geological discontinuities, weak or weathered slope material due to weather influences. External loads such as high rainfall and seismicity could play an important role in slope failure. For this reason, a precise classification of rock mass is needed for the basis of determining technical policy. Rock slopes in open pit coal mining areas, especially in Indonesia, are characterized by applying various rock mass classification systems, such as Rock Mass Rating (RMR) and Geological Strength Index (GSI), because the study area comprises well exposed rock formations. In the RMR system, there are five main parameters viz. Uniaxial Compressive Strength (UCS) of rocks, Rock Quality Designation (RQD), spacing of discontinuity, discontinuity conditions, and groundwater conditions were considered. In this paper, several rock mass classification systems developed for the assessment of rock slope stability were evaluated with the condition of rock slopes in the tropics, especially Indonesian region, particularly in sedimentary rocks in the open pit coal mining area in order to get the corrected GSI equation used to characterize rock slopes based on quantitative analysis of rock mass structure and surface conditions of discontinuities

Keywords
Sedimentary Rock ,Rock Mass Rating, Geological Strength Index

Topic
Mining and Metallurgy Engineering

Link: https://ifory.id/abstract/2Aj9ayqTt4ge

Corresponding Author
Tiara Ayu Ningratri

Institutions
a) University of Lampung, Lampung
*tiaraayuratri[at]gmail.com
b) Marine Geological Institute, Bandung

Abstract
Cross plot analysis of well log data and its calculated elastic atributes are one of the most effective methods to discriminate lithology and fluid type, because the geophysical rock properties analysis is relatively less time and cost compare to other method such as geological core sample analysis. This study uses well log data analysis based on cross plot, lithology separation, fluid type distribution map of 5 (five) wells at Nias Waters. The inverse of the interval transit times of the sonic logs are used to generate computed compresional velocities and Castagna-s formula for predicting S-wave data. Employing rock physics algorithms, rock properties including elastic attributes such as LambdaRho, MuRho, and Vp/Vs ratio are also extracted from the well log data. Cross plotting is carried out and plots with the most outstanding results are LambdaRho - Vp/Vs, MuRho - Vp/Vs, LambdaRho - Density, MuRho - Density, and AI - Vp/Vs. For the one well considered, the MT-1 well and its formation N10-N11 interest zone, those cross plots can identify lithology and fluid type. It determines formation N10-N11 as a gas carbonate reservoir with average porosity 23% which indicates that proper gas flow in the reservoir. Finally, the cross plot analysis are suitable to characterize reservoirs lithology and fluid type.

Keywords
cross plot analysis; Castagna-s formula; carbonate reservoir; Nias Waters

Topic
Geophysics,Geomatics and Geochemistry

Link: https://ifory.id/abstract/EW2r7U6Nfvwp

Corresponding Author
Tiara Ayu Ningratri

Institutions
a) University of Lampung, Lampung
*tiaraayuratri[at]gmail.com
b) Marine Geological Institute, Bandung

Abstract
Cross plot analysis of well log data and its calculated elastic atributes are one of the most effective methods to discriminate lithology and fluid type, because the geophysical rock properties analysis is relatively less time and cost compare to other method such as geological core sample analysis. This study uses well log data analysis based on cross plot, lithology separation, fluid type distribution map of 5 (five) wells at Nias Waters. The inverse of the interval transit times of the sonic logs are used to generate computed compresional velocities and Castagna-s formula for predicting S-wave data. Employing rock physics algorithms, rock properties including elastic attributes such as LambdaRho, MuRho, and Vp/Vs ratio are also extracted from the well log data. Cross plotting is carried out and plots with the most outstanding results are LambdaRho - Vp/Vs, MuRho - Vp/Vs, LambdaRho - Density, MuRho - Density, and AI - Vp/Vs. For the one well considered, the MT-1 well and its formation N10-N11 interest zone, those cross plots can identify lithology and fluid type. It determines formation N10-N11 as a gas carbonate reservoir with average porosity 23% which indicates that proper gas flow in the reservoir. Finally, the cross plot analysis are suitable to characterize reservoirs lithology and fluid type.

Keywords
cross plot analysis; Castagna-s formula; carbonate reservoir; Nias Waters

Topic
Geophysics,Geomatics and Geochemistry

Link: https://ifory.id/abstract/UZHAmBK6P9gh

Corresponding Author
Reza Adhi Fajar

Institutions
a) Post Graduate Program in Mining Engineering, ITB, Ganesa 10 Bandung, Indonesia.
*reza[at]poliban.ac.id
b) Department of Mining Engineering, Poliban, Kayutangi Banjarmasin, Indonesia.
c) Graduate Program in Biotechnology, School of Life Sciences and Tech., ITB, Ganesa 10 Bandung, Indonesia.
d) Department of Microbiology, School of Life Sciences and Technology, ITB, Ganesa 10 Bandung, Indonesia.
e) Research Group for Earth Resources Exploration, ITB, Ganesa 10 Bandung, Indonesia.
f) Senior Hydrogeology, PT.BC, Pemuda 40 Tanjung Redeb Berau, Indonesia.

Abstract
Liquid waste with high amount of total suspended solid (TSS), is one of the significant environment issues from coal mining activities in Kalimantan island under high precipitation in of a very wide zone of coverage. The TSS concentration with Nano-sized particle in mine drainage caused by clay minerals which is dominated by montmorillonite type. Therefore, a huge chemical agent is usually used to treat TSS concentrations of the liquid waste less than 300 mg/L based on government regulation. However, in this case, the chemical flocculant triggers the onset of secondary pollutant because its carcinogenic and non-biodegradable. This study aims to observe specific fungi, Marasmius sp, as bio-flocculant for the treatment of mine drainage with extra high TSS. The fungi can produce biodegradable polymer that have ability to precipitate the montmorillonite with two mode action, they are bio-flocculant polymeration and mycelial trapping. A role model was running in laboratory scale less than 1 L in several graduated/measuring cylinders under 22-30 oC. The results of clarity test by using spectrophotometer shown a number of 86% clarity value averagely in one-hour treatment, while flocculation rate test indicated the amount of TSS concentrations became 110.1 mg/L. In this term, the minerals in the mine drainage samples from PT.BC mining excavation area, had been precipitated rapidly from previous measured TSS concentration at 11,000 mg/L.

Keywords
Total suspended solid; Mine drainage; Bio flocculant; Concentration

Topic
Mining and Metallurgy Engineering

Link: https://ifory.id/abstract/DGT29WhYaem8

Corresponding Author
Ietje Nazaruddin

Institutions
a), b), c), d) Department of Accounting,
Universitas Muhammadiyah Yogyakarta,
Jl. Brawijaya, Tamantirto, Bantul, Yogyakarta, Indonesia.
Tel.: +62-274-387656; Fax: +62-274-387646 Mob: +6282137551066
E-mail: ietje_effendi[at]yahoo.com.sg

Abstract
This study aimed to examine the effect of ethical leadership on performance appraisal satisfaction. The study also examined the role of trust as a mediator in the relationship between ethical leadership and performance appraisal satisfaction. Data were collected via questionnaires completed by 205 academics teaching in the faculty of economics and business at university in Yogyakarta. Validity and reliability testing was carried out before testing the hypotheses, and the data were analysed using PROCESS (Hayes, 2013). The results of the study show that ethical leadership and trust have a positive effect on performance appraisal satisfaction. The results also provide empirical evidence of an indirect influence of ethical leadership on performance appraisal satisfaction through the mediation of trust. For higher education management, the results of this study demonstrate the role of ethical leadership in increasing trust so as to increase lecturer satisfaction with performance appraisal.

Keywords
Ethical leadership, trust, performance appraisal satisfaction.

Topic
Strategic Management, Entrepreneurship and Contemporary Issues

Link: https://ifory.id/abstract/N2VTgWy3w4R7

Corresponding Author
Widyo Nugroho

Institutions
Postgraduate Student of Technology Management Department, Sepuluh November Institute of Technology, Surabaya

Abstract
BTS tower construction is often conducted only based on the perspective of the cellular operator company, that can provide benefits in terms of getting a wider coverage area. It is very clear that in the construction of BTS, operators only consider the determination of location based on their interests, ie the location of the appropriate BTS can maximize the coverage of coverage area coverage and service traffic. For the sustainable development, the selection of BTS construction sites should consider points of view from all stakeholders. Mobile operators consider the best location from a maximum profit standpoint for the long term, without negating the variables of government interest, considering from the point of view of the suitability of spatial and environmental allocations. Thus, it is necessary to analyze the decision-making in the appropriate location selection, either from the viewpoint of government, operators, or other relevant stakeholders. This study uses an empirical approach based on statistical methods (factor analysis) and mathematics in decision-making system (Decision Support System). Types of data used are qualitative data and quantitative data. The data are arranged in the form of variables are then elaborated to be done the factor analysis of these variables to obtain which variables that play a role in the construction of BTS tower. To identify variables that play a significant role, the process of factor analysis can also explain the closeness of relationships between variables, then the closely related variables are grouped into one group of factors, while the variables that do not play a significant role in the activities will be eliminated. This insignificant variable does not mean that the literature that states the variable is in the wrong role, but the variable is not appropriate to apply to the condition of this study so that its influence is not significant. Thus, the factor analysis process plays a role in the preparation of hierarchical structures that will be used in decision analysis using the Analytic Hierarchy Process (AHP) method. In this study, the AHP process is the final analysis that generates the priority of the BTS construction site.

Keywords
base transceiver station, factor analysis, analitical hierarchy system

Topic
Innovation, IT, Operations and Supply Chain Management

Link: https://ifory.id/abstract/eb3Nx7PYcgTd

Corresponding Author
Rahyuniati Setiawan

Institutions
Universitas Pendidikan Indonesia (a*), Universitas Pendidikan Indonesia (b), Universitas Pendidikan Indonesia (c)
rahyu[at]uniga.ac.id(*)

Abstract
Brand image and brand awareness play a central role in customers purchase-decision making. The purpose of this study is to examine the influence of brand image and brand awareness on brand loyalty. Data were collected through a survey on 133 sport motorcycle enthusiasts in Indonesia. The results revealed that brand image and brand awareness had positive influence on brand loyalty. This may imply that sport motorcycle companies should strive to establish brand image and brand awareness to promote brand loyalty.

Keywords
brand image, brand awareness, brand loyalty

Topic
Marketing Management

Link: https://ifory.id/abstract/ZqWEbHdp7jTe

Corresponding Author
Yasuko Shigeno

Institutions
a) Master of Management, Faculty of Economics and Business, Universitas Indonesia
Kampus UI Salemba, Jakarta, Indonesia
*yasukomshigeno[at]gmail.com
b) Faculty of Economics and Business, Universitas Indonesia
Kampus UI Salemba, Jakarta, Indonesia

Abstract
Business opportunities are widely available in the Muslim clothing industry, especially hijab products, for the past few years. With the high demand for hijab, an effort is needed to support SMEs to take advantage of these opportunities. This study aims to optimize the use of Instagram as a digital marketing channel for Larnis. Larnis is one of the SMEs that sells hijab products made of knitting material, which is less popular in Indonesia. Through qualitative method, the data are obtained by in-depth interviews, observations, surveys and focus group discussions. Based on the data and analysis, there has been a lack of promotional activities and less optimal use of digital marketing channel owned by Larnis. This is unfortunate because nowadays, consumers are actively seeking through digital platform to find the product they are looking for. The results of this research is a set of correction steps to optimize the use of Larnis- Instagram account for business purpose which leads to the increased exposure for Larnis and its product.

Keywords
Digital Marketing Channel, Instagram, Social Media, Exposure, Hijab

Topic
Digital Marketing

Link: https://ifory.id/abstract/NMTVQdy9eEtZ

Corresponding Author
Edbert Setiadi

Institutions
a) Master of Management, Faculty of Economics and Business, Universitas Indonesia
Kampus UI Salemba, Jakarta, Indonesia
*setiadi.edbert[at]gmail.com
b) Faculty of Economics and Business, Universitas Indonesia
Kampus UI Salemba, Jakarta, Indonesia

Abstract
The emergence of technology offers several opportunities for business owners to expand their markets and challenges to improve its business. The main purpose of this paper is to help the owner of Liliana Collection, a small medium retail Children Clothing store located in Central Jakarta to gain better understanding on how to improve its business operation specifically in marketing distribution and inventory management system. This research used qualitative approach. Data were collected from in-depth interviews, observation and questionnaire survey to customers. The data then were analysed using PEST Analysis, Marketing mix, STP analysis, Business Model Canvas and SWOT analysis. The findings were analysed using Gap Analysis and Pareto Analysis. Key findings revealed that Liliana Collection has traditional marketing distribution and inadequate inventory management system. Based on these findings, E-Commerce channel was adopted in expanding the marketing distribution channels and an inventory management application was used to help the owner in recording its inventory transactions. The implementations then carried out along with coaching process to educate the owner about the standard operating procedure (SOP) related to these two issues in order to make the execution successful. Therefore, these implementations were necessary to improve Liliana Collection business competitiveness.

Keywords
E Commerce, Digital Marketing, Inventory Management System, SME, Technology Adoption, Liliana Collection

Topic
Digital Technology For Business

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

Corresponding Author
Imanuel Arifin Supriatna

Institutions
Magister Management, Universitas Indonesia, Jakarta, Indonesia

Abstract
Abstract Purpose – Banking is estimated to be one of the business sectors that will be affected by distruption in industry 4.0 era. Human resources will be replaced by Technology. Therefore, in order to survive, many banks in Indonesia specifically carry out a strategy to reduce employees. Bank Central Asia (BCA) as the largest private banking company in Indonesia does not carry out a similar strategy. On the contrary, until now the number of BCA-s employees continues growth. Market value of the company still continues to increase. Challenging conditions require leaders and employees to be changed. The slogan "Trend is your Friend" becomes the main tagline to make employees aware that change is not a burden but a culture and part of themselves. The purpose of this study was to see the effect of Transformational Leadership and Organizational Culture on Organizational Citizenship Behavior (OCB) of BCA-s employees spesifically in the Division of Electronic Operations Centers. This study also discusses the mediating role of Organizational Commitment in the relationship between Transformational Leadership and Organizational Culture on OCB. The results of this study is finding the success factor to improve employee-s OCB in order to make productivity above expectations. Design/Methodology/Approach - Measurement of data analysis using the SEM-PLS method to determine the contribution of the dimensions of Transformational Leadership and Organizational Culture to OCB and to see the impact of the intermediary variables of Organizational Commitment. Hypothesis is using quantitative data by distributing questionnaires to employees of the Electronic Operations Center Division who have been working more than one year. The Electronic Operations Center Division was chosen with the consideration of its function as a center of operational and development of technology-based services for BCA. The questionnaire was distributed to 238 permanent employees of the Electronic Operations Center Division and 155 questionnaires was received. Findings - Based on the results of data analysis using SMARTPLS 3.0 software, it is known that Transformational Leadership does not affect OCB, a strong Culture that will increase OCB employees. Indirect Impact of Culture through Organizational Commitment still has a significant positive effect on OCB. Research limitation/Implication – The research is limited to the Electronic Operations Center Division. It can illustrates the operational conditions of BCA but cannot describe the condition as a whole. It is difficult to get respondents beside needs complex procedures also because employees are spread throughout the country. Originality/Value – This research uses a complex model, which combines the influence of leadership, culture and commitment to OCB. And that is rarely done by other researchers in Indonesia.

Keywords
Quantitative, Transformational Leadership, Organizational Culture, Organizational Commitment, OCB, Banking.

Topic
Human Resource Development

Link: https://ifory.id/abstract/Y2x7WG4qrTve

Corresponding Author
Nove Hidajati

Institutions
(a) Department of Basic Veterinary Medicine, Faculty of Veterinary Medicine, Universitas Airlangga Surabaya
(b) Department of Anatomi Veterinary, Faculty of Veterinary Medicine, Universitas Airlangga Surabaya

Abstract
Ghrelin is a gastric peptide that plays an important role in regulating food that enters the body (food intake). Before eating plasma ghrelin concentration rises gradually and immediately drops after eating. Addition of ghrelin intravenously increases food intake and triggers appetite (appetite), this proves that ghrelin plays a role in hunger and the initial desire to eat (meal initiation). Ghrelin was also involved in weight control because the body mass index was negatively controlled by plasma ghrelin concentration at fasting time. Signal abnormalities originating from the stomach will be related to energy balance disorders, growth and this is related to gastrointestinal and neuroendocrine function. Knowledge that shows between the relationship of ghrelin, ghrelin receptors, hypothalamus and the implications of ghrelin in controlling gastrointestinal function, energy balance, current growth is still not entirely clear. In previous studies it was known that in broiler chickens the molecular weight of ghrelin protein is 13.4 kDa and the amino acid composition of the ghrelin protein is mflrvil or methionine, phenylalanine, leucine, arginine, valine, isoleucine, leucine. The results showed that the exploration of natural ingredients came from Ipomoea aquaticum, Nasturtium officinale, Manihot esculena showed the presence of ghrelin protein. Ghrelin results from plants are then used for experiments in several experimental animals. With the discovery of ghrelin protein from natural ingredients from plants, it can be used to regulate energy balance so that there is an increase in feed efficiency.

Keywords
Ghrelin, Plant Ghrelin, Energy Balance, Efficiency Feed

Topic
Health and Medicine

Link: https://ifory.id/abstract/rMRn62HfLABD

Corresponding Author
Anwar Ma ruf

Institutions
(a) Postgraduate School Universitas Airlangga
(b) Department of Basic Veterinary Medicine, Faculty of Veterinary Medicine, Universitas Airlangga Surabaya

Abstract
The purpose of this study was to determine the molecular weight of the protein STAT STAT 5a and 5b that exist in liver tissue as a basis to determine the amino acid composition of broiler STAT protein phosphatase that is experiencing growth due to increased growth hormone (GH). Broiler liver tissue samples isolated from broilers were maintained for 21 days, then the examination followed by SDS Page and Western Blott. Results Western Blott known that STAT 5a protein molecular weight of 91 kDa with an amino acid composition ciggppkvmnmeesn or cysteine, isoleucine, glycine, glycine, proline, proline, lysine, valine, methionine, asparagine, methionine, glutamate, glutamate, serine, asparagines and STAT 5b of 90 kDa with an amino acid composition datnilvspvylypdip or aspartate, alanine, threonine, asparagine, isoleosine, leucine, valine, serine, proline, valine, tyrosine, leucine, tyrosine, proline, aspartate, isoleucine, proline.

Keywords
STAT 5a, STAT 5b, growth, broiler

Topic
Health and Medicine

Link: https://ifory.id/abstract/kPWdU3NrM6T8

Corresponding Author
Enjang Ali Nurdin

Institutions
Program Studi Pendidikan Ilmu KOmputer FPMIPA UPI

Abstract
The purpose of this research is to develop a Role-Playing Game (RPG) multimedia based Inquiry Training Model (ITM) with a Q-Learning algorithm for subjects Structured Query Language (SQL) on vocational high school in department of software engineering. The design of study is done with phase analysis, design, development, implementation, and assessment. At this stage of the analysis carried out literature studies, field and acquisition of information about the curriculum and syllabus that applicable. Results of analysis used for designing materials, flowcharts, and storyboard. Multimedia learning related to the ITM phase. RPG game elements in the form used as a multimedia approach for learning. Q-Learning algorithm is added to the multimedia as a user interaction to provide advice in the RPG. To obtain multimedia learning assessment in the context of the development, validation is done by theexpert in media and content. The next assessment phase is limited trials conducted in a single unit in which student access to multimedia learning in groups. Respondent assessors are 14 people in class XI vocational high school no 11, Bandung. The results showed values in the range of "Very Good" according to expert in media and content also the student assesment.

Keywords
multimedia learning; RPG; Inquiry Training Model; Q-Learning algorithm,

Topic
Computer Science Education

Link: https://ifory.id/abstract/M76LgXTuv4kp

Corresponding Author
Jamila Rahmoun

Institutions
a) Université Polytechnique Hauts-de-France
Campus Mont Houy, 59313 Valenciennes cedex 9, France
b) Université de Lille, Faculté de Médecine
1 place de Verdun, 59045 Lille cedex, France

Abstract
Understanding the physical mechanisms of bone fracture represents a major challenge in biomechanics, since it allows the enhancement of injury criteria commonly used by Euro NCAP benchmarks for the safety of passenger cars or pedestrians. It can also deliver a follow up of athlete-s safety during their trainers avoiding risk zones of injury especially in contact sports. This knowledge is essentially based on the use of the numerical models, whose prediction is assessed through the development of high resolution medical imaging and simulation softwares. Among these models, the anthropometric test device (ATD) commonly used for crash-test or other more detailed local models simulating the interaction between bone tissue and clinical equipment such as prostheses. Their advantage lies mainly in the diversity of configurations and loading conditions and hence the optimization of time and the total benchmark cost. However, one can observe that the material constitutive laws used are often derived from the experimental characterizations carried out at the macroscopic scale ignoring the bone microarchitecture. A micromechanical based approach revealed to be more suitable where the robustness of computation and accuracy of results are of interest. The present investigation is devoted to the theoretical formulation and validation of an ductile damage model applied to the human humerus bone in the thermodynamics framework. The approach consists in formulating the macroscopic material tangent operator by considering the linear local behavior of each phase. Due to the matrix-inclusion morphology of the bone microstructure, a Mori–Tanaka scheme was considered at the localization stage. In order to consider the strain rate effects on the humerus behavior, the standard model of Johnson-Cook was adopted as a preliminary trial. The obtained micromechanical model was implemented using a User Material subroutine (UMAT) within the explicit dynamic code LS-DYNA. The validity of the resulting finite element model was validated by comparing numerical predictions with experimental measurements at different length-scales. The outcome of the proposed ductile damage model appears to correctly predict the general trends observed experimentally through the good estimation of the ultimate impact load that a human humerus may encounter at fracture. The fracture patterns predicted by the proposed micromechanical damage model are consistent with the physical humerus rupture even if this model is limited only to the fracture initiation. Further improvements will be performed to the present model to take into account the marrow effects and fracture patterns.

Keywords
Micromechanical modeling; Ductile damage; Numerical simulation; Human Humerus

Topic
Mechanical Engineering

Link: https://ifory.id/abstract/QEV2gaJcUwNj

Corresponding Author
Dwi Riana Aryani

Institutions
Universitas Indonesia

Abstract
A disturbance in the power system can lead to a voltage instability in the system. Voltage instability in the system causes the system to operate abnormally leading to voltage collapse or total blackout in the entire system. This paper discusses voltage stability to anticipate disturbance with Static VAR Compensator (SVC) using transient simulation in ETAP 12.6.0 software. Load shedding scheme by using voltage relay is analyze when a massive generator disturbance occurs. Load shedding scheme is relayed to revert and stabilize the system voltage. The scheme will trip some of the high priority load from the system. 15 MVA or 12,32% of the whole load will be saved to prevent the load from tripping used SVC with 30 MVAR ratings. Based on the analysis, SVC can be used to minimize load shedding for power system disturbance anticipation.

Keywords
power system, voltage stability, transient simulation, load shedding, Static VAR Compensator

Topic
Electrical Engineering

Link: https://ifory.id/abstract/bDc64LNFEVuX

Corresponding Author
Dwi Riana Aryani

Institutions
Universitas Indonesia

Abstract
Faulted Inter Bus Transformer (IBT) can cause power system instability. Therefore, it will be isolated to prevent the spreading of disturbance. IBT at the Paiton Substation which supplies Paiton – Grati and Bali Subsystem is discussed in this paper. The event discussed is 2 of 3 IBTs are out of work so that only one left. So, load shedding of Bali Subsystem is required to avoid further disturbance. However, after it is applied, the voltage at the Bali Subsystem will increase beyond the allowed rating because some substations in Bali Subsystem have capacitor banks to increase voltage during normal operation. Therefore, further action is required by releasing some capacitor banks of several substations that have the highest rated voltage until the voltage in all substations is within the permitted rating. Finally, it is shown that the proposed method can restore system stability by evaluating the rated capacity at IBT Paiton and rated voltage at Bali Subsystem.

Keywords
capacitor shedding, Inter-bus Transformers (IBT), load shedding

Topic
Electrical Engineering

Link: https://ifory.id/abstract/EBLAvecaj27b

Corresponding Author
Rudi Hartono

Institutions
Universitas Indonesia, Universitas Sultan Ageng Tirtayasa

Abstract
Organic ion exchange resins as heterogeneous acid catalysts that use oil nyamplung to produce biol.diesel. It was performed at various temperature and time to get optimum condision for making biodiesel. These heterogeneous catalysts is environmentally friendly and easily separated and can be reused. The molar ratio of use oil nyamplung and methanol (1:7) was used is esterification. The yields of biodiesel at various optimum temperatures and times were : 93 % ( 5 M HCl), 87% (6M HCl) dan 85% (7M HCl). Biodiesel results were analyzed by GC Ester content and modified catalysts were characterized using FTIR, XRD SEM-EDX and BET

Keywords
Katalis Heterogen, Oil Nyamplung, Katalis Resin Penukar Ion, Diaion PK 208 LH

Topic
Chemical Engineering

Link: https://ifory.id/abstract/EAzdCPkjG946

Corresponding Author
Dwi Riana Aryani

Institutions
Universitas Indonesia

Abstract
Loss of 500 kV transmission line of Paiton-Grati 1 & 2 causes voltage instability in surrounding subsystem which may lead to further disturbance in the Jawa-Bali system. Minimization of the voltage instability can be handled by adding Flexible AC Transmission System (FACTS) devices, such as Static Synchronous Compensator (STATCOM) and Static Synchronous Series Compensator (SSSC). STATCOM and SSSC have the capability of dynamically controlling the power flow through a line. This paper aims to compare the performance of both devices to maintain system stability in the case of loss of 500kV transmission line. The performance of these methods is compared through the analysis of the bus voltage, the active power, and the rotor angle. As a result, this paper shows that the implementation of STATCOM is more stable instead of SSSC.

Keywords
FACTS, Instability, SSSC, STATCOM

Topic
Electrical Engineering

Link: https://ifory.id/abstract/bqKT2kPjGMr7

Corresponding Author
Suwarsono Suwarsono

Institutions
a) Mechanical Engineering Department, Faculty of Engineering, University of Muhammadiyah Malang
*) suwarsono[at]umm.ac.id
b) Mechanical Engineering Department, Faculty of Engineering, Universitas Indonesia

Abstract
The Friction Stir Welding (FSW) process is commonly used for joining aluminum sheets. The FSW process occurs due to temperature and the force of emphasis on the connection. heat Energy is generated from the deformation of material and friction between the tool and the material. The FSW process generally emphasizes the generation of heat energy from the deformation process of material. This research studies the FSW process which prioritizes the friction between tool and material, as a heat energy generator. Research of Friction Stir Spot Welding uses aluminum A1100 sheets with a thickness of 0.4 mm. Tool material are HSS, with shoulder diameter of 4 mm, the pin diameter 2 mm and length 0.6 mm. The joining process of Friction Stir Spot Welding used tool rotational speed of 33000 rpm. This research has proven that the main heat energy can be generated from friction, which results from high speed rotation of tool. The axial force and temperature distribution measured at several points location. Shear strength data and microstructures of welds indicate that this method is feasible to be applied in the FSSW process.

Keywords
Friction Stir Spot Welding; High rotation; Alumuinium A1100; Shear strength

Topic
Mechanical Engineering

Link: https://ifory.id/abstract/MvPeB7mt9nJR

Corresponding Author
Nurul Ilmi

Institutions
Department of Industrial Engineering, Faculty of Indutrial Technology, Sepuluh Nopember Institute of Technology, Surabaya 60111, Indonesia
*nurulilmi136[at]gmail.com

Abstract
A total of 15.72% of the elderly in Indonesia are currently connected to the internet. Nowadays, elderly start using applications such as Gojek and Grab to meet their daily needs. However, the interface design by its application does not support the limitations of the elderly. There are many elderly people who have difficulty in using the applications that exist today. This study aims to design an application interface that is suitable for the elderly using eye tracker technology. Eye tracker is a tool that is capable of recording data where the human pupils are focused, recording the interests and interests of users so that they can provide accurate analysis in designing the interface design of an application. Respondents in this study were young elderly with a age range of 60-69 years. The experimental design in this study was that the elderly were asked to order Go-Car services in the GoJek application and recorded using Tobii Eye Tracker. The results of this study can be a reference recommendation for creative industries that want to make the elderly as their market segmentation.

Keywords
Elderly,Gojek Aplication, Eye tracker technology

Topic
Industrial Engineering

Link: https://ifory.id/abstract/Yf8c3gZzhNV4

Corresponding Author
Fadil Muhammad

Institutions
Departement of Electrical Engineering
Universitas Sultan Ageng Tirtayasa
Jl. Jendral Soedirman KM 03. Cilegon - Indonesia
a) fadil.muhammad[at]untirta.ac.id
b) ceri.ahend[at]untirta.ac.id
c) masjudin[at]untirta.ac.id

Abstract
In the 4.0 industrial revolution, technologies are designed to be able to connect to the internet. These technologies should be able to exchange data between them using sensors and others. One of the ways to send it is by the wireless sensor network. However, involving the internet in exchanging data needs security guarantees. Three things must meet in network security, that is confidentiality, integrity, and availability. Cryptography use for the confidentiality of the information that will be sent by the user. In this research will be using the symmetric cryptography for network security on wireless sensor networks. In addition to network security, symmetric cryptography method will be used also consider energy efficiency on a wireless sensor network. Chacha stream cipher as symmetric cryptography will be used as a method of messages encryption. Experiments in this research used NS-3 as a network simulator. Results of the tests show that the purpose method has a computation time of 0.2385 ms and the second fastest after the rabbit cryptographic process. Chacha LR WPAN simulation process has a computation time of 17.6199 ms.

Keywords
Wireless Sensor Network, Cryptography

Topic
Electrical Engineering

Link: https://ifory.id/abstract/Wx6JCD3BHLqR

Corresponding Author
Cakra Adipura Wicaksana

Institutions
Universitas Sultan Ageng Tirtayasa
Universitas Muhammadiyah Bandung

Abstract
Electrocardiogram (ECG) signal is one of importance signal from our body that sourced from heart. There are many benefits that can be obtained from ecg signals, for example can determine whether sleepy or not, whether stress or not, and several diseasses like arrhytmia, hypertension, heart failure, etc. In this research, we proposed module for extraction feature for ecg signal to Heart Rate Variability (HRV) parameters using GPU Acceleration. The output can be used for further analytics or another module, but in this research only emphasis on QRS detection and peak detection from ecg signal. The input will be ecg Signals and the output will be array of peak in every row. There have been various research trying to extract or detect QRS and peak based on Pan-Tomkins Algorithm, but this research will make use python and will compare the acceleration using some library. The flow comprise five main step, (1) load ecg signal, (2) filtered ecg, (3) derivative from filtered ecg, (4) squaring from derivative ecg, (5) convolution squaring ecg, and (6) peak detection using Fiducial Mark. The output will list of array that contain mark for every peak in every ecg signal. The overall module has been succesfully implemented and compared in python. The result show that computation using numpy is still better and faster for small array data. The Output of peak of array can be used to the next module.

Keywords
ecg, hrv, feature extraction, gpu, qrs, peak detection, pan-tomkins

Topic
Computer Engineering

Link: https://ifory.id/abstract/Ba8dV2KuZGjX

Corresponding Author
Callista Fatima Larasati

Institutions
(1) Department of Mechanical Engineering, Faculty of Engineering, Universitas Indonesia, Depok, 16424, Indonesia
(2) Department of Metallurgy and Material Engineering, Faculty of Engineering, Universitas Indonesia, Depok, 16424, Indonesia
(a)sugeng[at]eng.ui.ac.id, (b)callista.fatima[at]ui.ac.id, (c)nurul.ilmaniar[at]ui.ac.id, (d)suharno[at]metal.ui.ac.id

Abstract
Osseointegration is a process consisting of the formation of bone tissue on the implant surface, so that the osseointegration process occurs, a surface with surface roughness (Ra) is required in isotropic microtopography with a size of 1-100 nm. The plasma treatment can be done to reach the Ra parameter. This study aims to discuss the treatment of Plasma Electrolytic Process (PEP) with the principle of physiochemical erosion using electrolytic cells on Ti-6Al-4V alloy implants, to form a plasma layer in the form of spark discharge and Vapour Gas Envelope (VGE). Samples made of Ti-6Al-4V are tested with several parameters including different electrolytes and different applied voltages are investigated, and the results of the formation of VGE which influences the surface characterization are evaluated. The results show that the process of PeP with electrolyte consist of 50% H3PO4 + 10% NaClO4 + 1% HF and 10% ethylene glycol + 2% NH4F at a voltage of 90-130 V produces VGE and non- homogeneous spark discharge resulting in a surface with microporous structures with increasing surface roughness and micro-hardness indicating the formation of an oxide layer.

Keywords
Plasma Electrolysis Process; Surface Roughness; Ti-6Al-4V Implant; Osseointegration

Topic
Materials Science

Link: https://ifory.id/abstract/m4Yb8pQWdgu2

Corresponding Author
Hafid Alwan

Institutions
a) Department of Chemical Engineering, University of Sultan Ageng Tirtayasa, 42435 Cilegon, Banten, Indonesia
b) Department of Chemical Engineering, Faculty of Industrial Technology, Institut Teknologi Bandung, Jl. Ganesha 10, Bandung, Indonesia
*hafidalwan[at]untirta.ac.id

Abstract
The CFD method is used to evaluate the performance of the spray dryer operation in various geometry and operating conditions. This method is believed to be able to replace, complement, and strengthen the role of the experimental method in resolving problems that occur in the spray drying chamber. Through this method, the design information needed in the cylinder-on-cone spray dryer construction can be obtained. Especially related to the milk drying process. This information is obtained by investigating the performance of the spray dryer with several steps that must be passed. This investigation was conducted aimed at obtaining comprehensive design information. Stages carried out include, constructing thermophysical properties of milk, determining grid generation that includes grid shape and size, determining the size of the geometry of the spray drying chamber, and determining the angle of the droplet spray dryer. Thermophysical properties of milk are constructed in two ways, first using the Aspen Plus® V10 and mathematical equations obtained from experimental data from several researchers. The numerical solution solved through the CFD method using FLUENT ANSYS 19.0. The turbulent model used is Re-Normalized Group-kε (RNG-kε). This turbulent model is believed to be able to provide better results compared to the standard turbulent k-ε model. The standard turbulent k-ε model is built on the basis of turbulent isotropic and turbulent equilibrium, without any correction of the swirl. Through the turbulent model, the swirl RNG-kε found in the spray drying process can be calculated for its contribution. The contribution of the swirl in the turbulent model RNG-kε can be seen through the magnitude of the turbulent viscosity value (μt). The spray drying chamber in this study is represented in two-dimensional geometry (2-D). The shape of the grid used is a triangular (trilateral) form with a total grid of 574.942 elements. Through the shape and number of the grid, the jet pattern is far more stable so that it can minimize the presence of numerical errors. The variables used in this numerical investigation are geometry variable represented by the size of the diameter and spray angle. By using grid size and shape as well as the turbulent RNG-kε model, fluid flow patterns of each variable are obtained. This pattern of fluid flow basically represents the trajectory passed by the particle. Flow patterns that have strong backflow can cause high particle end temperatures. The reason is the particles are held in the drying chamber following the fluid flow. This flow pattern is created in the small size of space and wide spray angle. The problem that is often caused in the presence of particle deposits on the walls and product agglomeration. Through analysis of the droplet evolution curve into particles and sticky area curves, milk droplets can be traced to an area that allows deposits and agglomeration to occur. The result is particle deposition that often occurs in the walls of the cone and the wall near the atomizer. While agglomeration occurs in the product collection area. The design of the spray drying chamber which is considered the best to be built is a spray dryer with 2 m diameter and spray angle of 60 and 100 degrees in order to produce the final product with the low temperature and water content.

Keywords
CFD method, spray dryer, chamber, milk, flow pattern, sticky area

Topic
Chemical Engineering

Link: https://ifory.id/abstract/qbwK8eGFu4B9

Corresponding Author
MUHARAM KEMAL ADAM

Institutions
a) Department of Metallurgical and Materials Engineering, Faculty of Engineering, Universitas Indonesia, Kampus UI, Depok, Indonesia 16424
*anne[at]metal.ui.ac.id

Abstract
Characterization of AC4B/Nano TiC Composite With Volume Fraction Variation of Nano TiC Reinforce by Stir Casting Process has been investigated. Author used aluminium alloy series three, AC4B, which contain silicon and copper as its main alloy. Furthermore, the addition of Nano TiC into AC4B composite can increase the tensile strength, ductility, and toughness of AC4B composite by refining the dendrite structure of the α-Al phase and forming super saturated solid phase, θ (Al2Cu). This research opens the opportunities of aluminum composite material to be used in arms industry, such as bulletproof material. In this study, AC4B/Nano TiC composite were made through stir casting with some variable parameters of Nano TiC reinforce composition of 0.25%, 0.3%, 0.35%, 0.4%, and 0.5% volume fraction to determine the optimum value of the mechanical properties of AC4B/Nano TiC composite. Stir casting process was chosen because it has several advantages, such as easy to use, flexible, and can be used to produce a large number of the products. It is known that AC4B/Nano TiC composite has optimum value of the mechanical properties when Nano TiC composition is 0,3% volume fraction with ultimate tensile strength of 132,31 MPa and the hardness of 55,18 HRB.

Keywords
AC4B Composite; Nano TiC; Stir Casting

Topic
Materials Science

Link: https://ifory.id/abstract/HEP7Utzrh9vu

Corresponding Author
Rizkijanuar Ramadhan Saputro

Institutions
(a)Department of Mechanical Engineering, Faculty of Engineering, Universitas Indonesia, Kampus UI, Depok, Indonesia 16424
(b)Department of Metallurgical and Materials Engineering, Faculty of Engineering, Universitas Indonesia, Kampus UI, Depok, Indonesia 16424
*sugeng[at]eng.ui.ac.id

Abstract
Titanium and its alloys are standard for orthopedic prosthetic devices, due to their good mechanical properties and biocompatibility. However, bioactivity on the implant surface needs to be improved to achieve an optimal osseointegration process. Metal implants are often coated by hydroxyapatite (HA) because they have a chemical composition and crystal structure similar to apatite in the human skeletal that suitable for bone reconstruction. The focus of this research is on surface treatment designed to promote better biological responses through hydroxyapatite layers. Also combining the acid etching treatment of Ti-6Al-4V and the electrophoretic coating process of the hydroxyapatite to obtain stronger mechanical interlocking interface. HF treatment conducted in various time. Then, coated with nanosized HA through electrophoretic deposition (EPD) at 15V voltage for 10 minutes followed by 800oC heat treatment. Scanning Electron Microscopy and Contour measurements were performed to show the surface topography indicating the formation of surface contours with increasing surface roughness parameters in accordance with the time of the etching process. The contours on the surface of the substrate induce the mechanical interlocking of the surface so that the results of hydroxyapatite deposition optimal at the time of etching 5 minutes.

Keywords
Biomaterials; Chemical Etching; Ti6Al4V; Hydroxyapatite Coating

Topic
Materials Science

Link: https://ifory.id/abstract/kEzt4aDUZew2

Corresponding Author
Erizka Ramdhiani

Institutions
a) Civil Engineering Department, University of Indonesia, Depok, West Java, 16424, Indonesia
b) Civil Engineering Department, University of Indonesia, Depok, West Java, 16424, Indonesia
*wrahayu[at]eng.ui.ac.id

Abstract
Peat has been known for its high compressibility, low shear strength and high-water content. Moreover, when it comes to dry season, peatland is easily to be burnt leaving the large amount of carbon into the atmosphere also causes significant damage to peatland ecology. Based on these, peat burning remains are used as fly ash and it is expected to improve the strength of peat soils alongside to be environmentally safe. Laboratory tests were carried out according to that condition. A study on the influence of fly ash addition in peat soils was done by comparing the result from CBR (California Bearing Ratio). Different percentages of fly ash (i.e. 15, 20, and 25%) were added into peat soil at optimum moisture content amidst 5% of Portland Cement for each sample with a variety of curing time of 2 hours, 1 day, 3 days, and 7 days. Changes were observed in specific gravity, acidity, and the microscopic structure. The CBR test results show that the peat gained strength due to the addition of different percentages of fly ash as well as the increase of curing periods, with the optimum result applying 15% of fly ash upon the curing periods of 1 day. Furthermore, according to the results, the peat soil can be used as a subgrade.

Keywords
California Bearing Ratio; Peat Soil; Peatland Fire; Stabilization

Topic
Civil Engineering

Link: https://ifory.id/abstract/JN3RBta9WZAn