Indonesia Conference Directory

Corresponding Author
Abdul Aziz Faisal

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
At present, the combination of metal matrices and ceramic reinforcement as composite is popular for creating materials with good mechanical properties. Aluminum is used as a matrix because of its lightweight, ductile, and low melting point. In this paper we discuss the effect of adding silicon nitride reinforcement to AC4B aluminum. Five sample variations were made based on fraction volume percent (1, 3, 5, 7, 10) which were fabricated through stir casting method. In the fabrication process the magnesium element was added to increase the wettability, TiB grain refiner, and modification with strontium element. The samples made got destructive, tensile, impact, and hardness testing to determine the mechanical properties of the composite. Observation of phases, elements, compounds and microstructure was done to see the distribution of reinforcing particles in the aluminum matrix and the estimated phases formed. The results showed that the optimum tensile strength of variable occurred at the addition of 1% volume of silicon nitride with a strength value of 104.94, and the optimum hardness value was at the addition of 3% Si3N4, which was 44.8 HRB. The phases formed in the composite were Mg2Si, Al2Cu, β-Al5FeSi, and π - Al9FeMg3Si5 phases.

Keywords
AC4B; Micro Si3N4; Stir Casting

Topic
Materials Science

Link: https://ifory.id/abstract/WHjwvf3cgUNu

Corresponding Author
Syaiful Syaiful

Institutions
Diponegoro University

Abstract
Vorticity causes many adverse effects on the area near the surface, both on moving (turbine blade) and fixed objects. Therefore, this study attempts to investigate the effects of free-stream turbulence on trailing edge vortex on the NACA 0015 airfoil profile. This research was conducted using two-dimensional numerical simulations. To determine the interaction of vortex and free stream turbulence, two variations of turbulent intensity were given, namely 0.5% and 4.6% with Reynolds number of 1.6 x 105. The k-e turbulence model was used in the current study. The angle of attack of the flow towards the airfoil was varied from 0 deg. to 25 deg. in conditions of increase and decrease in the horizontal position of the airfoil. The result was found that there is an agreement between the simulation and the experiment result. Increased turbulent intensity can delay the stall condition, the stall process begins to be observed after the 12 deg. attack angle at 0.5% turbulent intensity while at turbulent intensity 4.6% the stall process was found after the 15deg. attack angle. From a velocity streamline, it was found that an increase in turbulent intensity can inhibit vortex growth.

Keywords
Free stream turbulence, Trailing edge vortex, NACA 0015, Turbulent intensity

Topic
Mechanical Engineering

Link: https://ifory.id/abstract/vpQMVaWHum3R

Corresponding Author
Sekar Sakti

Institutions
Industrial Engineering, Universitas Gadjah Mada,
Jalan Grafika No. 2 Kampus UGM, Yogyakarta 55281, Indonesia
*sekarsakti[at]ugm.ac.id

Abstract
The increasing development of the textile industries has made the competition sharper. To maintain a competitive place in the market, it is critical for a textile industry to keep their production effectiveness at the highest level. Total productive maintenance (TPM) can be done to improve production performance, both in terms of quantity and quality. How successful the TPM implementation is measured by Overall Equipment Effectiveness (OEE) which shows the effectiveness level of a particular machine. The imbalance pattern between target and actual production in almost all departments in the textile industry encourages OEE analysis to determine the performance of each machine they use. However, operators are facing difficulties in measuring OEE for every machine manually. This study aims to develop a computerized database system to help measure the OEE calculation so it can help the company knows their real-time machine performance. It automates the process of OEE calculation and identify the losses associated with equipment effectiveness. The developed system is validated using the historical operational data of a Spinning Department in a textile industry.

Keywords
total productive maintenance; overall equipment effectiveness; textile industry

Topic
Industrial Engineering

Link: https://ifory.id/abstract/3t8MfjxXG7dm

Corresponding Author
Yuli Agusti Rochman

Institutions
a) Program Pasca Sarjana Teknik Industri, Program Studi Teknik Industri, Universitas Gadjah Mada; Universitas Islam Indonesia, Yogyakarta, Indonesia
*gusti[at]uii.ac.id
b,c,d,e) Program Studi Teknik Industri, Universitas Gadjah Mada, Yogyakarta, Indonesia

Abstract
The company applies lean manufacturing to be competitive in global competition. Through this application, the company carries out quality improvements, cost reduction, timely delivery and other factors. Lean manufacturing is an integrated social-technical system. The lean goal is to eliminate waste and reduce the variability of suppliers, customers, and internal resources and processes. The lean concept is to minimize the amount of time and resources used in the manufacturing process and other activities of a company, with an emphasis on eliminating all forms of waste. A lean framework can be a guide to implementation and help practitioners identify, overcome waste, and understand how and when to apply various lean approaches in organizations to achieve business excellence. This research shows some researchers perspectives on the need for a lean framework. Based on the literature review, there are 3 stages and 21 steps in lean implementation as the initial framework that will be evaluated and produce 3 stages and 8 steps that are in accordance with the needs of the SME.

Keywords
Lean, SME, theoretical framework, the initial lean framework, the proposed lean framework

Topic
Industrial Engineering

Link: https://ifory.id/abstract/yqzPfHnBJ4jh

Corresponding Author
Ary Arvianto

Institutions
Gadjah Mada University
Diponegoro University

Abstract
Many reported cases of city logistics in literature have been dominated by developed countries and the numbers of cases have significantly increased over time. On one hand, it is argued that the city characteristics in developed countries differ from those in developing countries. The different characteristics may lead to different problems and different approaches to solving the problems. This paper provides practices of city logistics in developing countries. The purpose of the present study is to identify the dominance factors, typical city logistics problems, and associated with the level of study in some developing countries. This paper describes literature-based research that has sought to understand the practices of city logistics in developing countries. The literature review process used a bibliometric analysis and followed by a systematic literature review to organize 118 papers relating to the concept and the practice of city logistics. We identify the weak consideration of aspects of stakeholder behavior in city logistics policy planning in developing countries is the dominant factor. Meanwhile, city logistics concepts and models in developing countries have been widely studied. Based on the classification, the typical problem or subject of city logistics that appears in developing countries is related to transportation networks, routing, loading and unloading systems, and collaborative planning. Many previous studies used an analytical, heuristic, and simulation approach to solve problems.

Keywords
city logistics, developing countries, urban freight

Topic
Industrial Engineering

Link: https://ifory.id/abstract/ewuD3GfMhKpW

Corresponding Author
Dwi Riana Aryani

Institutions
Universitas Indonesia

Abstract
Disturbances which commonly occur in electric power system such as loss of generation may affect the frequency stability. Hence, in order to maintain the stability, a load shedding is carried out by analyzing the reactive power and triggering the circuit breaker through frequency relay. Analysis of the reactive power is used to determine the location of the loads that will be released. The objective of the methodology is to minimize the loss of load while maintaining the frequency stability of the system. Four scenarios are employed in this study in accordance with the quantity of generator trip. As a result, the proposed method is able to minimize the amount of loss of load ranging from 18 MW to 35 MW with the frequency recovery time is less than 30 seconds.

Keywords
power system stability, frequency stability, load shedding, frequency relay, islanding

Topic
Electrical Engineering

Link: https://ifory.id/abstract/fLgAVZ4neHKq

Corresponding Author
Olyvia Novawanda

Institutions
a) Department of Industrial Engineering, Faculty of Industrial Technology, Institut Teknologi Sepuluh Nopember, Surabaya 60111, Indonesia
*erwin[at]ie.its.ac.id

Abstract
Abstract. The concept of dual channel supply chain (DCSC) allows retailers to sell their products broadly. Channel collaboration, offline and online, helps companies to survive amid competition through increasing profits. Nonetheless a review of previous studies in DCSC provided no explicit model addressing consumer behavior in two directions, offline to online as well as online to offline. This study proposes an analog model to evaluate the factors that influence consumer preferences for switching channels from offline to online and from online to offline used the push pull mooring (PPM) approach to identify the variables involved in consumer channel switching-intention. The object is apparel retailer under dual-channel structure. Furthermore data is collected by means of questionnaires. Confirmatory factor analysis is then used to test the validity and reliability of the variables involved. Structural equation modelling (SEM) used to identify variables that have a significant effect on consumer switching intention. The results of this study may be used as reference for researchers and apparel retailer managers to develop strategic plans in operating their business.

Keywords
Dual channel supply chain; Switching intention; Push pull mooring; Structural equation modelling

Topic
Industrial Engineering

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

Corresponding Author
Nabila Yuraisyah Salsabila

Institutions
Department of Industrial Engineering, Institut Teknologi Sepuluh Nopember, Kampus ITS Sukolilo-Surabaya 60111, Indonesia

Abstract
A maintenance strategy is an important factor in the production activities of the process industry. Since the process industry consists of many components, the failure mode is relatively complex. This paper observes one of the petrochemical companies in Indonesia which produces Pythalic Anhydride. The company is able to produce in 20.69 days every month. In reality, during 2017, the company produced 23 days every month on average. Production, known as the calendar day, which cannot achieve the target can affect customer service level. This research focuses on evaluating availability in order to minimize Mean Time to Repair (MTTR). One of the best strategies is to control the spare part inventory policy so that the spare part must be available when an equipment downtime occurs. We will use two modelling techniques to solve the problem: (a) reliability block diagram will be used to model the failure mode and (b) the simulation model will be used to model the entire system, including random variables and variable inter-dependency. After conducting scenario analysis by varying some parameters, the availability increased to 91.8% and average calendar days decreased to 22.64 days per month.

Keywords
Availability, Discrete event simulation, Inventory management, Reliability block diagram

Topic
Industrial Engineering

Link: https://ifory.id/abstract/KCBfqQ4vGMN7

Corresponding Author
Yoshi Dessiani

Institutions
School of Strategic and Global Studies, University of Indonesia

Abstract
The magnitude of profit turnover in commercial apartments market, frequently led to the asymmetrical relationship between private sector as real estate developer and apartments owner as citizen. This condition was marked by administrative violations that are often carried out by real estate developers. Throughout 2018, the DKI Jakarta Government received various complaints related to the apartments management and operation, including conflict of interest and transparancy issues in the Apartments Owners and Residents Association (PPPSRS). Following certain agenda that had been pushed by civil society organizations since 2006, the government attempted to formulate a particular public policy to protect each party involved in the vertical housing operation. Conducted with qualitative research methods, the objective of this study is to examine the implementation of the DKI Jakarta Governor Regulation Number 132 Year 2018 concerning in the Management of Owned Apartments (Pergub 132/2018).

Keywords
real estate, conflict of interest, transparancy, vertical housing, regulation, Jakarta

Topic
Civil Engineering

Link: https://ifory.id/abstract/nB3UTaxWVAJC

Corresponding Author
Muhammad Fakhruriza Pradana

Institutions
1) University of Sultan Ageng Tirtayasa
2) Universität Duisburg-Essen

Abstract
Maritime transportation plays a very important role in world trade, more than 90% of world trade using this mode. Along with the development of science and technology, maritime transportation faced more complex and robust problems in term of their optimization. In this paper, we purpose a Systematic Literature Review (SLR) on Maritime Transportation Optimization (MTO) in three-level decision making that is strategic level, tactical level, and operational level. We also have identified Linear Programming (LP) as a proper preference to study MTO. This SLR using a structured approach that involves bibliometric and network analytics from the articles published during 1976 – 2019. Some of the key findings in this study as follows, (i) research and citation in MTO using LP is growing rapidly and reached its peak in 2018; (ii) three countries with the highest number of articles are the United States, Norway, and China; (iii) shows a great opportunity for future research to combine strategic planning, tactical planning, and operational planning.

Keywords
Linear Programming, Maritime Transportation, Optimization, Systematic Literature Review

Topic
Civil Engineering

Link: https://ifory.id/abstract/ZyhxqYdPp2Cf

Corresponding Author
Yudha Gusti Wibowo

Institutions
Universitas Jambi

Abstract
Mercury (Hg) is a dangerous metal that give an impact for environment and human health. Mercury is abundant in polluted water such as acid mine drainage, peat water and wastewater in industrial area. This paper will explain how to reduce mercury in wastewater use activated bentonite. Bentonite is a raw local material and abundant in Jambi province. Bentonite has activated using HCl and H3PO4 0.5M. Activated bentonite has identification by X-Ray Diffraction to find the peak of natural bentonite and activated bentonite. Activated bentonite use HCl can adsorb 99,33% and H3PO4 can adsorb 99.96%. Activated bentonite using H3PO4 more efficient than HCl to reduce mercury in wastewater.

Keywords
Bentonite, Activated Bentonite, XRD, Mercury

Topic
Chemical Engineering

Link: https://ifory.id/abstract/epzFkhcmwvJ4

Corresponding Author
Anisa Maulida

Institutions
University of Indonesia

Abstract
Mesophase pitch, which can be produced from vacuum residue (VR), may be used as precursor in activated carbon (AC) production process. VR still lacks of utilization and ends up as waste. VR has the potential to be used as a feedstock because of its low cost and contains aromatics and aliphatic subtituents. Gum rosin may be added in the production of mesophase pitch because of its conjugated double bond carbon content. In the present study, co-pyrolysis occurs in a stirred tank reactor at temperature about 450℃ with heating rate of 5oC/minute and hold for 120 minutes. The amount of gum rosin mixed with VR was varied 0, 5, 10 and 15% wt of VR. The precursor products had C/H mole ratio of about 2.43, 2.37, 2.28, and 2.01. This precursor underwent carbonization at at 700℃ with heating rate 5oC/minute and holding time for 120 minutes at 700oC under N2 flow. KOH was used as activating agent to precursor of activated carbon. Activated carbon gave surface area that increase as addition of gum rosin and rasio C/H deacreasing. Activated carbon AC0, AC5, AC10, dan AC15 have surface areas of 120.81, 194.56, 312.36, dan 462.19 m2/g and high crystalline structure.

Keywords
activated carbon, gum rosin, carbonization, activation, vacuum residue.

Topic
Chemical Engineering

Link: https://ifory.id/abstract/xywtp37zDhX4

Corresponding Author
Fachri Munadi

Institutions
1) Department of Chemical Engineering, University of Indonesia
Jalan Fuad Hasan, Pancoran MAS, Kukusan, Beji, Kota Depok 16424, Indonesia
*Corresponding author: dsupramo[at]che.ui.ac.id

Abstract
Crude oil refineries in Indonesia produce much waste in the vacuum distillation as vacuum residue, but its utilization is still low. As heavy oil residue, vacuum residue contains high aromatics and therefore high carbon which can be utilized as raw material to produce high surface area activated carbon (AC). Such a AC is widely used in the field of gas storage and electric double-layer capacitors (EDLCs). Electric double-layer capacitors (EDLCs) with activated carbon electrodes are known to have higher capacity for energy storage. Vacuum residue containing isotropic aromatics can be pyrolysed to form anisotopic aromatics which has high crystalline content thus increasing mechanical strength of AC. In the present work, vacuum residue was mixed with dehydrated castor oil as conjugated double bond source, then followed by pyrolysis at heating rate of 5°C/min until 450°C and holding time at 450°C for 90 minutes. The amount of dehydrated castor oil added to vacuum residue was varied at 0%, 5%, 10%, and 15% weight of vacuum residue. Castor oil can be obtained from castor oil plants, which are widely grown in Indonesia, by extraction process of castor bean. Dehydration of castor oil used a catalyst of sodium bisulfate to obtain conjugated double bonds. Co-pyrolysis of vacuum residue and addition of conjugated double bonds reduce C/H atomic ratio precursors, from 1.82 to 1.50, 1.48, and 1.45. Product of co-pyrolysis of vacuum residue and dehydrated castor oil was used as a precursor to prepare for activation and carbonization. The activation was conducted by activating the precursor with KOH solution and followed by carbonization at heating rate of 5°C/min until 700°C and holding time at 700°C for 30 minutes. The results show that the addition of castor oil by 0%wt, 5%wt, 10%wt, and 15%wt improved pore surface area from 150.32 m2/g, 236.97, 290.99, and 357.78 m2/g.

Keywords
Mesophase Pitch, Dehydrated Castor Oil, Vacuum Residue, Pyrolysis.

Topic
Materials Science

Link: https://ifory.id/abstract/cuPnA4ewy6Mq

Corresponding Author
Rindu Twidi Bethary

Institutions
1) Doctoral Student, Faculty of Civil and Environment Engineering, Bandung Institute of Technology, Indonesia

2) Lecturer, Faculty of Civil and Environment Engineering, Bandung Institute of Technology, Indonesia

3) Research and Development Center of Road and Bridge, Ministry of Public Work and Public Housing, Indonesia

Abstract
The technology of using waste for road construction by using slag as an aggregate substitute is able to reduce costs as well as environmentally friendly technology. Hot mix asphalt pavement (HMA) will experience aging both short and long term, this study was conducted to see how the effects of aging in hot asphalt mixtures by using slag. There were three types of mixtures in this study with different levels of slag, aging test specimens were conditioned by the AASHTO R30 testing method. The results of testing the slag characteristics with SEM that the slag surface is roughness than the natural aggregate, also the slag has porosity on its surface indicates that the slag has stronger adhesion properties with the asphalt. In hot asphalt mixtures with slags obtained by increasing the slag percentage, the optimum bitumen content will be smaller but if viewed from the optimum marshall stability value at a slag percentage of 20%. Then the mixture was conditioned for short-term aging with a higher marshall stability value compared to normal conditions with void in mixture (VIM) values, while for long-term aging the stability value decreased compared to normal conditions with VIM values approaching normal conditions without aging.

Keywords
Slag, Aging, Stability, VIM

Topic
Civil Engineering

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

Corresponding Author
Bambang Iskandriawan

Institutions
Institut Teknologi Sepuluh Nopember

Abstract
In line to the economics growth rate which is improved hence economics level of the family also more prosperous. It is followed by the number of vehicle more increase. Jamming problem come to be in serious situation. Not to mention the pollution problem which is caused by the exhaust gas of motor vehicle where their number always increase every year. One of the problem solutions is within the operating of bicycle as the alternative of transportation. Based on the research experience before concerning to the applied heat transfer and bicycle design also the serious reality above so the author intend to air purifier bike design. The existence of them is expected will diminish the intensity of urban air pollution in a straightaway. Secondary manner it will give suggestion and stimulus for city inhabitant in order to strive their region is more environments friendly. Repeating manufacture even design are could not be prevented when some failure are occurred in the testing stage. Follow up the problem statement of urban air pollution, limited space, city inhabitant taste likewise production competence furthermore it is answered within bring into practicality the design and prototype of air purifier bike.

Keywords
Air purifier bike; short distance transportation; air pollution; and towns

Topic
Mechanical Engineering

Link: https://ifory.id/abstract/NxLGh8kZTgzX

Corresponding Author
Retno Sulistyo Dhamar Lestari

Institutions
Universitas Sultan Ageng Tirtayasa

Abstract
Papaya leaves contain chemical compounds that can be used as biopesticides. Alkaloids are compounds in papaya leaves that have biological activities and function as protectors of plants from pests and the environment. So it is necessary to do research on the content of alkaloids to be used as material for further studies in the utilization of chemical compounds in papaya leaves. Besides alkaloids, papaya leaves also contain flavonoids and tannins. This study aims to determine the levels of alkaloids, flavonoids and tannins from papaya leaf extract qualitatively and quantitatively. Extraction of papaya leaves was carried out with the aid of ultrasonic waves using 96% ethanol and water solvents for 5,10,15,20 and 25 minutes, then dried using an oven to obtain powder extract. The extract obtained was tested qualitatively using reagents that were in accordance with the test parameters and functional group analysis using the infrared spectrum. Whereas for the quantitative test on alkaloid compounds using the gravimetric method, tannin compounds and flavonoids using the UV-visible spectrophotometric method. Infrared spectrum analysis showed that papaya leaves contained alkaloids, flavonoids and tannins. Qualitative test results showed positive papaya leaves containing alkaloid compounds characterized by the presence of brick red deposits, flavonoids characterized by the formation of red color, tannins are characterized by blackish green. Qualitative test results showed that the highest alkaloid content in this study was produced at 25 minutes extraction time with 96% ethanol, which was 5.75% in 1.5 grams of extract, the largest flavanoid content was produced at water solvent extraction at 10 minutes, 2, 4088%, the highest tannin content was produced by extracting with ethanol solvent at 20 minutes, which is 0.5341%

Keywords
papaya leaves, alkaloids, extraction, ultrasonic

Topic
Chemical Engineering

Link: https://ifory.id/abstract/GAfkBUjd2Pzq

Corresponding Author
Hasna Nurhasanah

Institutions
(a) Industrial Engineering, School of Industrial and System Engineering, Telkom University
Jalan Telekomunikasi, Jalan Terusan Buah Batu Nomor 01, Sukapura, Dayeuhkolot, Bandung, Jawa Barat, 40257, Indonesia
*hasnanurhasanah_hn[at]gmail.com

Abstract
Machine is a vital tool of the company in helping the production process. Every company expects the production to run smoothly, but sometimes it is hampered by damage that happened to the machine, so that the production process is disrupted and causes losses to the company. Engine damage can be minimized by regularly evaluating the condition of the spare parts. In practice, if the inventory policy is not accurate it will causes stockouts or overstocks, which can lead to more costs for the company. This research aims to obtain an optimal preventive maintenance schedule and inventory policy for any spare parts by determine the reorder point (r) and the economic order quantity (EOQ) using the Markov Chains to analyse the reliability of the spare parts and the probability for the corrective maintenance will be needed. After the optimal inventory policy (r,Q) is found, the result of this research is the reduction of the total inventory system costs. If in reality the company is facing the stockouts problem, this research can help to decrease the shortage cost. And if the problem is overstocks that the company is facing, then this research can help to decrease the holding cost.

Keywords
Inventory Policy; Spare Parts; Reliability; Markov Chains

Topic
Industrial Engineering

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

Corresponding Author
Dhimas Satria

Institutions
a) Mechanical Engineering Department, Universitas Sultan Ageng Tirtayasa, Indonesia
*dhimas[at]untirta.ac.id
b) Industrial Engineering Department, Universitas Sultan Ageng Tirtayasa, Indonesia

Abstract
External combustion engine, one of those is striling machine has advantage which can utilize all type of fuel, so that it is suitable for biomass utilization application. In this study an analysis of best design selection on striling machine was conducted, different from previous study, which is innovation of design on striling machine of alpha type by making corner phase to 180o, with the purpose to reduce gravitational force when the cylinder is compressed, because the corner phase currently used is (90o) has weakness which is the cylinder wall is perpendicular, so that the compressing process is against gravitational force. The design selection method is conducted by using Quality Function Deployment (QFD) method and Pahl and Beitz method, which is started by collecting the design requirement and objective (DRO), formulating House of Quality, analysis and implementation, specification determination, level function determination, function morphology determination, and best variant determination.

Keywords
Design selection; Stirling machine; Design innovation; Biomass

Topic
Mechanical Engineering

Link: https://ifory.id/abstract/7zWeBH2C9UxF

Corresponding Author
Dwi Novi Setiawati

Institutions
Sultan Ageng Tirtayasa University Faculty of Engineering, Civil Engineering Department

Abstract
Sudimara Station is one of the stations located in the city of South Tangerang. This station   belongs to the 3rd class train station, with the growth rate of passengers driving private vehicles   increasing by approximately 2.2 % to 3.2% every year. Most of passengers who drive their personal   vehicles choose to park in the parking area provided by the station. The aim of this study was to know the characteristics of parking activity on weekdays   and holidays, and also to know the parking needs at this time land the next five years. This study used   survey method with primary data obtained through direct survey that recorded the vehicles that come out   and enter the parking area, so it can be known the duration of the vehicles that were parked. The   secondary data obtained from PT. Reska Multi Usaha and PT. Kereta Api Indonesia. The data analysis   in this study was based on the planning and operating guidance of parking facility 1998. The results of the study showed that both the north and sout parking areas, with the highest  parking characteristics, occurred on weekdays, where the north parking area has an area of 3,538 m2 with  parking capacity for two-wheeled vechicles 314 SRP and four-wheeled vehicles 105 SRP and the south  parking area has an area of 3,617 m2 with parking capacity for two-wheeled vehicles 137 SRP andfour-wheeled vehicles 158 SRP. The current insufficient parking requirements are only two-wheeled vehicles   in the northern parking area, it is 29 SRP deficiencies, while for the next 5 years, parking requirements   based on the current parking characteristics for two-wheeled vehicles in the northern parking area still   lack of 68 SRP and on the southern parking area still lack of 17 SRP, but for the four-wheeled vehicles,   the avaibility of two parking areas are now still sufficient for parking needs for the next 5 years.

Keywords
Parking Characteristics; Parking Needs; Station

Topic
Civil Engineering

Link: https://ifory.id/abstract/7j96ZDngCVPG

Corresponding Author
Anna Maria Sri Asih

Institutions
Industrial Engineering Program, Department of Mechanical and Industrial Engineering, Universitas Gadjah Mada (UGM)
*amsriasih[at]ugm.ac.id

Abstract
Fulfilling electricity needs which are mostly supplied by the coal steam power plants, such as Indonesia, has its own challenges. Therefore, the government is expected to provide a reliable coal supply to each power plant. The coal supply chain is a complex network in which various coal specifications can be supplied by more than one supplier, and also uncertainty in demand and lead time exist. Each supplier offers different price for the coal and also different transportation cost based on the location of the supplier which are scattered in several places in Indonesia. In order to find the set of suppliers and transportation route of coal, optimization model that minimizing the purchase and transportation cost of the coal to fulfil demand in the power plant was built. The output from the optimization was used as an input to find the effective safety stock, order quantity, and reorder point needed in each plant in order to prevent the occurrence of stock out. Furthermore, a sensitivity analysis was also carried out to understand the impact of variation in demand and lead time and also the impact of implementing multiple suppliers on safety stock level in each plant.

Keywords
Steam Power Plant, Coal Supply Chain, Stochastic Demand, Stochastic Lead Time, Multi-Supplier

Topic
Industrial Engineering

Link: https://ifory.id/abstract/upAe2xZhbwK8

Corresponding Author
WIDYA ASTRIYANI

Institutions
a. Department of Electrical Engineering, University of Indonesia
Jalan Salemba Raya, RW.5, Kenari, Senen, Central Jakarta City, Jakarta 10430
*widyaast[at]gmail.com

b. Department of Electrical Engineering, University of Indonesia
Jl. Margonda Raya, Pondok Cina, Beji, Kota Depok, Jawa Barat 16424, Indonesia

Abstract
The commercial sector counts as one of the biggest consumers of electrical energy. Thus, efforts to save electricity in this sector will also influence significant energy efficiency. Some of the electricity loads that can be saved in this sector include air conditioners (AC), lights, lighting, elevators, pumps, and other electrical equipment. Use of air conditioner in commercial sector can be reduced by control management, both in temperature and power control. Direct load control (DLC) is the control system that can adjust the time schedule for temperature setting and power setting. The results of this paper is to see the potential energy reduced and cost reduced from using DLC in commercial sector specifically office building.

Keywords
Direct Load Control, Air Conditioner, Commercial Sector, Energy

Topic
Electrical Engineering

Link: https://ifory.id/abstract/zb6vXnZCrULu

Corresponding Author
Ghozi Nashiruddin

Institutions
(a) Lecturer of Material Engineering Department, Sepuluh Nopember Institute of Technology, Surabaya 60117, Indonesia
(b) Graduate of Material Engineering Department, Sepuluh Nopember Institute of Technology, Surabaya 60117, Indonesia
(c) Student of Material Engineering Department, Sepuluh Nopember Institute of Technology, Surabaya 60117, Indonesia

Abstract
CUI is a form of corrosion caused by the presence of water vapor in pipeline insulation materials. Corrosion under insulation (CUI) is difficult to observe, since the corrosion occurs between the surface of the pipe and the insulating material placed on the outer surface of the pipe. This research has purpose to know the influence of variation of fluid temperature in and variation of coating type to corrosion characteristics of outer part of steel pipe ASTM A53 Grade B with insulation material of silica aerogel and alumunium foil. Pipes to be tested at internal fluid temperature of 50oC, 60oC and 70oC with variations of epoxy, alkyd, PTFE and polyurethane coatings. With outside environmental conditions using 150ppm NaCl content. The circuit will be tested for 14 days with the immerse method. To analyze the corrosion characteristics that occur are used OM, SEM, XRD, and Weight Loss test. OM test results show that as the coating temperature rise will be damaged. While the SEM results showed that the type of corrosion that arises is uniform corrosion. For weight loss test showed that with increasing temperature the corrosion rate is increasing with coating efficiency of highest to low coating is epoxy, PTFE, PU and alkyd.. While XRD test results show that corrosion product is FeS , FeCl2 dan Fe2O3.

Keywords
CUI; Silica Aerogel; Coating; Temperature

Topic
Metallurgy Engineering

Link: https://ifory.id/abstract/C9nFmdquy7Tp

Corresponding Author
Wahyudhi Sutrisno

Institutions
Department of Industrial Engineering, Islamic University of Indonesia, Yogyakarta

Abstract
The importance of increasing skills and expertise of human resources has affected the increasing of the demand for training provider services. This opportunity causes competition among many training providers. In order to strengthen each provider, it must employ an innovative business model such as canvas business model method. PT. X is one of training providers in Yogyakarta who needs to improve its business model so it can be more competitive among others for the long-term business. This study aims to identify and evaluate the current business model, and design an appropriate a business model based on canvas business model method. The study showed that PT. X needs to develop its business models by adding a renewable value proposition; expanding its consumers through cooperation with hotels and freelancers; creating a consumer community of PT. X; and gaining new additional revenue.

Keywords
canvas business model, value proposition, human resources, provider training

Topic
Industrial Engineering

Link: https://ifory.id/abstract/d4wMxALYZeau

Corresponding Author
Klodian Dhoska

Institutions
(1) Faculty of Mechanical Engineering, Polytechnic University of Tirana, Mother Teresa No.4
1001 Tirana, Albania
(2) Faculty of Engineering, University of Sultan Ageng Tirtayasa. Jl. Jend Sudirman km. 3
Cilegon Banten 42435 Indonesia

Abstract
Over the last decade, air pollution in the Republic of Albania is in a crucial moment and an actual problem that effect on human health. Many of the problems has been noticed in the industrial cities and urban zones where the number of industries and road transport has grown rapidly. One of the largest environmental impacts comes from landfilled and burning of the waste tires. This problem has made the government to support some companies for building up the recycling industry of the waste tire in Albania. The Recycled Tire Rubber have been used in many fields such as agricultural uses, sport applications, civil engineering, rubber modified asphalt applications etc. Therefore, different parts of the world have used rubber modified asphalts where the benefits were being more widely experienced and recognized. Based on it, our paper will be focused on the asphalt mixtures produced with Recycled Tire Rubber Modified Bitumen-s (RTR-MBs). The analysis of penetration, softening point and Marshall Test will be described in this paper. Our proposal can reduce environmental impact from the waste tires and improving the quality of the road constructions in Albania.

Keywords
Asphalt Application, Recycled Tire Rubber Modified Bitumen, Additives, Quality, Road Construction, Environmental Impact

Topic
Materials Science

Link: https://ifory.id/abstract/NWBa8EJxKFTv

Corresponding Author
Akhmad Sutoni

Institutions
Department of Industrial Engineering
University of Suryakancana

Abstract
CV. Do-a Sepuh is a rice mill company. This factory often experiences problems in the cost of engine maintenance which increases every year. Therefore, planning actions must be taken in the form of replacement and selection of new, more economical machines. This study aims to make a model of engine replacement decisions to minimize the expectation of total costs, calculate the time (years) that is appropriate to make changes using the Dynamic Programming method. As well as making decisions on the use of new machines using the Analytical Hierarchy Process (AHP) method. Previously, a Focus Group Discussion I (FGD I) was conducted to determine which machines would be chosen and determine the engine selection criteria. Furthermore, Focus Group Discussion II (FGD II) was carried out to calculate the operating costs of new machines, revenue for new machines, the remaining number of new machines, and filling out questionnaires. The results obtained were the decision to replace diesel engines in the first year. The engine chosen, for the selected diesel engine is machine 1 (Yanmar TS 230 R).

Keywords
Dynamic Programming, Analytical Hierarchy Process (AHP), Machine Replacement, Machine Selection

Topic
Industrial Engineering

Link: https://ifory.id/abstract/WNBuUTgXQZ64

Corresponding Author
Dandun Mahesa Prabowoputra

Institutions
1.Graduate School of Mechanical Engineering, Sebelas Maret University, Jl. Ir. Sutami 36 A, Central Java, Surakarta, 57126 Indonesia
2.Department of Mechanical Engineering, Sebelas Maret University, Jl. Ir. Sutami 36 A, Central Java, Surakarta, 57126 Indonesia
3.Department of Naval Architecture and Marine System Engineering, Pukyong National University,Busan 48513, South Korea

Abstract
Savonius water turbine research is still growing today. One of the developments that has been made is about modification of geometry. The research that has been done aims to improve the efficiency of savonius turbines. Savonius turbine has a simple structure, and is easily applied so that research on the savonius turbine is interesting. Savonius rotor ability that can operate at low velocity is an advantage that can be combined in the process of developing renewable energy. One of the researches that develops is changes in blade shape. In this study a change in blade shape was carried out. The circular profile "S" shaped geometry is modified into a semi-circular profile "L" with an outer overlap. Research has been carried out simulations using Ansys software with CFX Solver. Savonius rotors that have been used in this study are rotors with aspect ratio 1. Simulation has been done on 3-dimensional modeling and on the properties of pure water. Mesh is performed on the workbench with the tetrahedral method, and uses the K-epsilon turbulent type. From this study it was found that blade modification into semi-circular with "L" profile and outer overlap can improve the performance of the savonius water turbine on the horizontal axis.

Keywords
Savonius Rotor, Water Turbine, CFD, Renewable Energy, Coefficient of Power

Topic
Mechanical Engineering

Link: https://ifory.id/abstract/4LFp3fx7AQ6u

Corresponding Author
Faiz Husnayain

Institutions
(a) Department of Electrical Engineering, Faculty of Engineering, Universitas Indonesia

(b) Pusat Pengaturan Beban (P2B) PT PLN Persero Gandul

Abstract
In electric power systems, it will started from the generation phase until the distribution phase through transmission lines must take place well. The purpose of study is to analyze the implementation in optimizing the power flow and improving stability in Z Power System. Therefore, it is necessary to have sufficient electricity distribution so that the electricity sent can be as efficient as possible. In the Z electric power system, there are many problems in electric power transmission, namely loading on uneven channels and the threat of extinguishing in the event of a disturbance. Uneven load is caused by differences in impedance on the channel. Blackouts occur because the channel on the Z is a generator evacuation route where the area is crucial if a disturbance occurs. Therefore, a tool is needed to prevent it. One solution to this problem is to use a power electronics device called UPFC. The simulation results show an even distribution on the all transmission lines connected to substation of Generators will be decrease up more than 5% of the normal loading. In addition, the UPFC can also improve stability by compensating for the active power and reactive power needed by the system.

Keywords
Transmission System, Power Stability, FACTS, UPFC

Topic
Electrical Engineering

Link: https://ifory.id/abstract/dKAULXgnWGJ8

Corresponding Author
Dyah Okty Moerpratiwi

Institutions
Embassy of Canada

Abstract
This paper gives analysis about the utilization of a new advanced technology namely the Building Information Modeling (BIM) in a real construction project. As a new technology in this industry, BIM is believed as a new tool that can help the construction project to be more economical, efficient, and effective. Mostly used in developed country like China, this technology is progressively being used by some contractors, consultants, and developers in Indonesia nowadays. In term of case study, the writer of this paper use Glodon TAS (Takeoff Architecture Structure), TRB (Takeoff Rebar), TRB (Takeoff Cost Estimating), and TME (Takeoff Mechanical Electrical) as the sample of this paper. The writer will give a brief analysis about the function and application of this software with their advantages as well as disadvantages. Keyword: Building Information Technnology, BIM, construction, building, software Dyah Okty Moerpratiwi, Property Assistant Manager at Embassy of Canada Master en Sciences, Technologies, et Santé from Université de Technologie de Compiègne Magister Teknik - Sarjana Teknik from Civil Engineering - Universitas Indonesia okty.moerpratiwi@yahoo.fr +62 813 14304360

Keywords
Building Information Technnology, BIM, construction, building, software

Topic
Civil Engineering

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

Corresponding Author
Hendriko Hendriko

Institutions
Mechatronics Engineering Department, Politeknik Caltex Riau, Rumbai, Pekanbaru, 28265 Indonesia

Abstract
This paper presents a simple analytical approach to define cut geometry of multi-pass rough milling during a free-form surface milling. The shape of in-process workpiece surface was identified using the coordinate of corner points that are found in every step of stair surface. In every instantaneous tool location, the workpiece sections that have possibility intersecting with the cutting edge were identified based on the coordinate of cutter location point. The algorithm was developed for machining using indexable flat end-mill by considering the effect of helix angle to the cut geometry. The proposed method was successfully used to determine the length of cut and generated the shape of cuts. The validation of the accuracy was carried out by comparing the length of cut measured using CAD software with those generated by the proposed approach. The results demonstrate that the proposed algorithm was accurate. Moreover, the test validated that the helix angle tends to produce larger cut.

Keywords
multi-pass rough milling, free-form surface, analytical boundary method, helix angle, five-axis milling

Topic
Mechanical Engineering

Link: https://ifory.id/abstract/tjBbTgf2urwz

Corresponding Author
Amatulhay Pribadi

Institutions
Institut Teknologi Nasional

Abstract
Thermal load due to a fire along with wind load is one of the loads which may occur on the building structure. Meanwhile, the planning of buildings in Indonesia generally does not take the load into account. The presence of thermal load can lead into the degradation of structure especially for steel structure which has low resistance to fire. The result of this thermal load is failure which can lead into the collapse of the building. In this study, there will be studied the effect of thermal and wind loads on the response of steel building structure. The structure of the building that will be studied in this research is a fifteen stories building which serves as an office. In the preliminary design stage, there will be determined the dimensions and the profiles of steel which are used for structural elements based on the required codes. Thermal load along with wind load will be assigned on the building structure by considering the degradation of steel properties, the reduction of live load and super imposed dead load, and the speed of extinguishing process. This simulation is divided into three cases which are fast extinguishing, slow extinguishing, and the determination of the critical thermal load. At the stage of preliminary design and fire simulation, structural analysis will be done using the ETABS program. The result of fire simulation shows that the temperature level and the location of the fire will greatly affect the resistance of steel building structure. If the temperature is higher, the stress ratio of structural elements will expand too. In the determination of the critical thermal load, it is obtained that the minimum thermal loads which can cause failure in one major structural element are generally different at the bottom, middle, and top level of stories. In this case study, the highest critical temperature load is on the top level stories.

Keywords
Thermal Load, Speed of Extinguishing Process, Load Reduction, Steel Properties Degradation, Structure Failure

Topic
Civil Engineering

Link: https://ifory.id/abstract/gF7c9R4dTDEA