bluuebunny/crossref_metadata_2025 huggingface dataset:
Process simulation of glycerol production from corn oil via transesterification
Authors: Trirahayu D A
Published: May 2020

Glycerol is widely use in the production of cosmetics, solvents for drugs, and lubricants. Glycerol can be obtained as by-product of biodiesel production from vegetable oils through the transesterification process. One of the vegetable oils with abundant raw material availability in Indonesia is corn oil. Each vegetable oil generally consists of triglycerides and free fatty acids (FFA) with different composition. The triglycerides in corn oil is round 95.59% (mostly trilinoleate and triolein), the rest are FFA (2.51%), phospholipid and phytosterol. The simulation process was designed using Aspen Hysys version 8.8. The corn oil composition was simulated as 54.30% trilinoleate, 41.35% triolein, and 3.85% oleic acid (FFA). The mole ratio of corn oil: methanol was set to 1: 20. The transesterification process was simulated using conversion reactor with conversion 98% at temperature 60°C and atmospheric. The process was followed with methanol recovery and glycerol separation from biodiesel. From the process around 99.04% of excessed methanol was recovered. Glycerol and biodiesel were separated using membrane. The simulation indicates that 100 kg/h corn oil can have converted into 101.1 kg/h green diesel and 10.41 kg/h glycerol with purity 99.85%.
Utilization of mangosteen extract as a corrosion inhibitor of carbon steel in acid environment (HCl)
Authors: Ngatin A , Sihombing R P
Published: May 2020

Utilization of mangosteen rind extract as carbon steel inhibitors in the environment of hydrochloric acid (HCl) 0.1M, 0.5M, and 1.0M. Extracts were carried out by extraction using ethanol solvent at a temperature of 600C with a time of 80 minutes. The variation of extract concentration (100 ppm to 1000 ppm in 3 days and the effect of time of corroding the carbon steel with the addition of 1000 ppm extract. Corrosion rate is calculated based on the difference in weight and corrosion products shown by microscope optics. The objective was investigated corrosion inhibition efficiency that could be prevented by mangosteen peel extract as inhibitor. The results showed inhibitory properties of mangosteen peel extract for three (3) days increased with increasing extract concentrations up to 76.53% in 0.1M HCl solution and 28.83% in 1.0M HCl solutions. For the addition of 1000 ppm mangosteen peel extract showed inhibitor efficiency reached about 90% at 3 days of corrosive time in HCl 0, 5 M, 87% in 1.0 M HCl solution, and 81% in 0.1 M HCl solution. The experiment showed that the process of diffusion of compounds in extracts on the surface of carbon steel and react with ferro ions (Fe2 +) to form chemical covalent coordination coordinate with a thickness of 76 µm was succesfully done.
Characteristic study of biodiesel mixtures from used oil and diesel oil
Authors: Aulia H N , Hidayat F N , Sriana T
Published: May 2020

Biodiesel is an alternative fuel for diesel machines. Used cooking oil is blended with diesel with a certain volume ratio to improve the characteristics. The characteristics of biodiesel can not be fully used by diesel engines because it doesn’t meet the standards so that its characteristics need to be improved. As for utilizing it, it must be blended with diesel oil. The purpose of this study is to improve the physical and chemical properties of biodiesel, knowing the percentage of biodiesel volume from used cooking oil with diesel oil so that it can be known the optimal ratio of biodiesel with diesel oil which is close to diesel fuel specifications. Characteristics as variables in this paper are density, kinematic viscosity, pour point, and flash point of the specified mixture. The results show that the kinematic viscosity and density of the biodiesel-diesel mixture increase as the biodiesel mixture increases. Mixtures with higher biodiesel content have higher flash points. Mixing diesel with used cooking oil biodiesel may be of no use compared to diesel, but it can help in adjusting the viscosity, density, pour point, and flash point values according to applicable regulations.
Control of aluminum corrosion in seawater environment by adding turmeric extract to the coating material
Authors: Heriyanto H , Permanasari A R , Wibisono A , Purnomoaji S G
Published: May 2020

Turmeric is one of the plants that contains antioxidant compounds called curcumin. Antioxidants in curcumin include flavonoids and tannins. Antioxidants can be used as corrosion inhibitors and paint additives. This study aims to utilize turmeric extract as an inhibitor and additive coating agent for aluminum metal in the seawater environment. Turmeric is extracted using a methanol or acetone solvent with a sample: solvent ratio of 1: 8. Phytochemical and DPPH (1,1-Diphenyl-2-Picrylhydrazyl) analyzes were performed. Testing of extracts as inhibitors and coating additives was carried out by varying the concentration and time of corroding. The results showed that the extract produced contained flavonoids and tannins through qualitative tests using 1% FeCl3 and 10% NaOH, each of which gave a blackish green and a blackish red color. Antioxidant activity was tested by the DPPH method in acetone and methanol, which respectively showed 4509 ppm and 2057 ppm. The testing of turmeric extract as a coating additive was immersed for five days and obtained the best level of 1% which produced the lowest corrosion rate of 0.0228 mmpy with a protection efficiency of 68.60%. Turmeric extract corrosion test as a coating additive was achieved within eight days with a corrosion rate of 0.0011 mmpy and a protection efficiency of 88.89%.
The effect of effective microorganisms-4 (em-4) on biogas yield in solid-state anaerobic digestion of corn stover
Authors: Shitophyta L M , Budiarti G I , Nugroho Y E , Hanafi M
Published: May 2020

Biogas production from various organic wastes such as corn stover can be used as an alternative fuel. Corn stover is one of the agricultural wastes that are widely generated in Indonesia. It contains cellulose which has the potential to be used as raw material for producing biogas. The biogas production process was carried out in solid-state anaerobic digestion (SS-AD), i.e., a biological process that occurs naturally by a microorganism that breaks down molecules of organic material with a total solid content greater than 15%. This research was aimed to investigate the effect of EM-4 concentration on biogas yield. The volatile solids (VS) reduction was also measured in this study. The results of the study showed that EM-4 concentration had a significant effect on biogas yield (p < 0.05). The positive linear relationship was found between EM-4 concentration and biogas yield. The highest biogas yield of 597.98 L/kg VS was obtained at EM-4 15%. The main source of biogas production during SS-AD of corn stover was the reduction of VS.
Effect of brine mass rate on pressure drop and dirt factor in evaporator design
Authors: Wuryanti S , Maridjo M , Mudawari A
Published: May 2020

Geothermal is one of the most significant natural resource potentials in Indonesia. One power plant that utilises geothermal steam as its energy source is PLTP. Geothermal steam that has passed through the geothermal power plant separator to move the turbine while the residual waste (brine) with a high enough temperature has the potential to be a source of heating to produce electrical energy in the Kalina cycle generator. Using brine, before entering the turbine, it must first become airtight in the evaporator. Evaporator design requires initial parameters namely brine fluid flow rate and ammonia-water flow rate, shell dimensions and tube dimensions as well as the number of passes, then performs the design calculation steps until the calculation results meet operating requirements, namely the pressure drop value and the dirt factor. Different variations of brine rate will produce different pressure drops and soil factors. Brine rate variations are 11 kg/s, 22 kg/s, 33 kg/s, 44 kg/s, 55 kg/s and 66 kg/s show the lowest pressure drop of 0.098 bar and the most massive 0.68 bar, and the smallest dirt factor is 0,002 (hr)(m2 °C)/Joule moreover, the largest is 0,00019 (hr)( m2 °C)/Joule.
Impact evaluation of Cilember River normalisation to PURBALEUNYI Toll Road using two dimensional model HEC-RAS
Authors: Budianto B S , Djuwadi D , Muttaqin A S , Karnisah I , Astor Y
Published: May 2020

Cilember River flows from North to South of Cimahi and crosses PURBALEUNYI Toll Road in downstream. Therefore normalization of Cilember River Cimahi can impact the PURBALEUNYI Toll road. Hydraulic simulation carried out to determine the impact and formulate the mitigations alternatives. The study was conducted based on Detail Engineering Design Data for Cilember Normalisation Program prepared by Citarum River Authority as a base data. Two-dimensional HEC-RAS model was used to simulate the impact of the river normalization program. The model also used to evaluate the alternatives (detention pond, diversion of flows) to minimize the impact of the Cilember normalization program to PURBALEUNYI Toll road. Applying 10 year return period and HEC-RAS simulation, with an existing condition, 26 505 sqm area is inundated mostly in the North area of Toll Roads. After the normalization program, the inundation area shifts to the south area, including Toll road. The further simulation shows that normalization of the river can reduce inundation area to 7 993 sqm. Simulation of combination between detention pond and diverting the excess flow of Cilember to Kali Malang inundated area occurs, but it does not affect the toll road.
Adi Sumarmo airport train station: Transit and connectivity
Authors: Fajrillah M L , Aryanti T , Siswoyo S
Published: May 2020

The growth of people’s needs for transportation facilities in Indonesia has urged the government to build a particular space that could accommodate, facilitate, and contain people’s fast and massive movements. Urban planning needs to be oriented to transit activities to accommodate people’s moving behavior. Surakarta’s Adi Sumarmo International Airport has been one of the government’s plans for developing infrastructural facilities to connect essential areas in Central Java. As an international airport, Adi Sumarmo International Airport is expected to facilitate people’s movement to the city of Surakarta and other cities nearby. This article discusses the design of an airport-train station, employing a transit-oriented development approach. The design implements the concept of walkability, mixed use neighborhood, and an inclusive environment.
Optimizing maintenance of electrical components with BIM and web-based inputs to improve safety performance in government green building
Authors: Dewi S , Latief Y , Machfudiyanto R A
Published: May 2020

A green building with proper maintenance will have higher energy efficiency and longer lifetime, as damages to building utilities can be minimised. One of the vital utilities are electrical components. Damages to electrical components may have fatal consequences such as short circuit or fire. This research aims to improve the maintenance of electrical components of green building. A case study is taken from a government green building for electrical components, in order to meet the building reliability requirements which consist of safety, health, comfort, and convenience. Maintenance system which is Work Breakdown Structure (WBS) level 4 of building maintenance integrated with information systems and Building Information Modeling (BIM) are influential factors for building maintenance performance. The research methods used are archival analysis, case study, survey, expert judgement, and statical analysis. This research generates product of web based information system integrated with BIM, and also mathematical model that enhance the maintenance performance of government green building for electrical components would become more effective and efficient especially for safety performance.
Travel behaviour regression modeling of urban housewives in the great metropolitan Bandung area
Authors: Maryati S , Putro H P H , Hayati A
Published: May 2020

The Millennial Situation and Condition are now changing the lifestyles of the urban societies, especially for women. It is also changing their travel behaviour to do their daily activities to meet their family needs. Including in The Great Metropolitan Bandung Area, the urban women have high demand for their daily journey and tend to increase. By the theme of Gender Mainstream philosophy, urban women have the freedom to get their accessibilities of going anywhere with their own transportation modes, including non-working urban women or as housewives in the region of Bandung. As WRI (2015) said that was more than 50% of women’s mobility have a complex daily trip to meet their needs by doing their daily activities. It was done to meet the needs of family and home care in the terms of rising family’s welfare. While less than 60% of men’s travel behaviour have a simple trip. This kind of condition is very interesting to be analysed, especially in The Great Metropolitan Bandung Area. This study explains how complex the daily travel behaviour of non-working urban women and as housewives with activities based approach that were done outdoor in a week. The quantitative data that is performed by socioeconomic and household demographic variables serve as the basis to measure the independent variables affecting family welfare, as well as the type, time, and duration of each daily activities and daily traveling data of non-working urban women. Using Clustering Methods approach to describe the width of research area, we could find the differences of models by Regression Analysis. So, we have 3 kinds of Regression Models to figure out the each of cluster from 3 Clusters that we find by Clustering Method in The Great Metropolitan Bandung Area. The result of this study could be used to make a change of city transportation policy and also to analyse the economic potential area by the models for the government officers and the business owner to increase their profit. By the regression models result, it could be used to estimate many variables ini the future to increase the economic growth of the City from the transportation by user’s perspective.
Enhancing safety and comfort through mechanical component maintenance performance on green building using BIM-based information system
Authors: Riza I W , Latief Y , Machfudiyanto R A
Published: May 2020

The reliability of functioning mechanical components has major implications not only for the ease of use, lowering maintenance cost, avoiding loss of time and preserving safety factor but also for achieving green buildings mission namely emission and energy reduction. Failure in maintenance phase of mechanical components can adversely affect the achievement of the mission. Problems that occur are fragmented data, undocumented data, slow responses of human resource, and unscheduled maintenance. As a result, the massive budget spent in the green building construction phase is in vain. The purpose of this study is to improve the performance of maintenance of government green buildings in mechanical components by developing an information system that integrated with Building Information System (BIM). The case study studied was the Ministry of Public Works and People’s Housing Republic of Indonesia. The research methods used are literature reviews, case studies, system development and statically analysis. This study uses a Work Breakdown Structure (WBS) in managing data dynamically using BIM, which is integrated with web-based information systems. The result in this study explained that HVAC system, vertical transportation, BIM and information system has proofed that these variables could enhance the performance of mechanical components maintenance in green building which are safety, health and comfort.
Flexural strengthening of composite bridge glued laminated timber beams-concrete plate using CFRP layers
Authors: Mujiman M , Igustiany F , Hakiki R
Published: May 2020

The timber bridge design although economical, often has difficulty producing enough rigidity so that a solution is needed to solve it. The use of CFRP (Carbon Fiber Reinforced Polymer) as a reinforcement of structural elements if properly designed and implemented can produce an effective and efficient composite structure. The experimental study aims to analyse the strength, stiffness and ductility of flexural strengthening composite bridge glued laminated timber beams-concrete plates using CFRP layers. The dimensions of the composite glued laminated timber beams 100/180 mm and concrete plate 75/300 mm with a length of 2,480 mm. The number of specimens is 3 composite glued laminated timber beams-concrete plate consisting of 1 test beam without CFRP reinforcement, 1 test beam with one layer CFRP reinforcement, and 1 test beam with three layer CFRP reinforcement. Experimental testing of flexural loads is done with two load points where each load is placed at 1/3 span length. The test results show that the strength of composite laminated timber beams glued - concrete plates BN; BL-1; BL-2 in a row 81.32; 82.82; 82.69 kN/mm; stiffness in a row 7.51; 8.22; 6.32 kN/mm and successive ductility of 16.67; 28.83; 20.21.
Effect of temperature rise against durability and behaviour of ground granulated blast furnace slag concrete
Authors: Kusuma Y , Nursyafril N , Ruchiyat I , Harahap A H S
Published: May 2020

Concrete which affected with high temperature will lost its strength significantly by 60%. To overcome this problem is utilizing steel industry waste, that is Ground Granulated Blast Furnace Slag (GGBFS) which is used as a substitute for cement in concrete mixtures. The properties of GGBFS which is cementitious same as cement, so that it can fulfil the function of cement. In this research, GGBFS concrete and normal concrete with strength of concrete is 30 Mpa and both types of concrete will be burned at a temperature of 600°C for 2 hours. After that, characteristics strength of concrete will be tested to GGBFS concrete and normal concrete in each concrete before being burned and after being burned. The result of this research, there was an insignificant increase in strength of concrete with GGBFS as a substitute for cement by 40%. The average compressive strength of GGBFS concrete before and after being burned was 30.48 MPa and 11.16 MPa, compared to normal concrete which was 30.06 MPa and 9.76 MPa. Increasing also happened at the result of flexural test, wich is initial crack at GGBFS concrete occur in greater deflection and load than normal concrete.
Comparison of Rowe cell and oedometer test to determine peat soil consolidation parameters
Authors: Yuswandono M , Somantri A K , Rabiya R
Published: May 2020

Many problems occur when building infrastructure on peat soil. That problem is large settlement. To know large settlement can do the testing. The consolidation test it consist of testing using a row cell and oedometer. The purpose of the two tools are different. This cell rowe tool can knowing the saturation value of sampling. Loading on this test with hydrostatic pressure. While oedometer cannot knowing the value of saturation, but the loading used can be static and cyclic loads. In this research take the sample used in Rawa Pening. The type of soil used in this area is peat soils. The method is use two tool and then comparison. From the results of the research implication the value of soil ability (Cc) and the coefficient of speed consolidation (Cv). In testing with rowe cell, the average soil Cc value was 0.499 and the Cv value was 256.89 cm2 per minute. Average soil pore cavity (e) of 15.00. Whereas in the evaluation with an oedometer, the soil Cc value was 0.64 and the Cv value was 154.54 cm2 per minute. The average soil pore cavity (e) is 0.77. From the results of testing prove a greater density index with rowe cell test.
The effect of performance of beam reinforced concrete beams with screw toward share test
Authors: Muchtar M , Madyono K , Baihaqi A
Published: May 2020

The potential of bamboo as one of the materials that have a high tensile strength of parallel fibres is expected to be an alternative material to replace steel reinforcement. This research would develop bamboo as reinforcement which is applied to the structure of reinforced concrete beams by making modifications that utilize as much as possible the strongest part of bamboo, namely on the skin. In the modification made on bamboo reinforcement, there are 2 types of reinforcement, namely bamboo reinforcement using 1-cm screw nails and bamboo reinforcement using 1½ cm screw nails, while the distance between screw nails is taken at 75 mm. Reinforcement area there is 4 strain gauge. Beam structure behaviour between variation 1 and variation 2 did not experience significant differences. The highest maximum load reaches 50.12 kN and also with the largest deflection of 18.73 mm. The performance of bamboo reinforced concrete beams can be said to be good with a significant increase in beam ductility with a ductility value of 29.93 - 27.61% when compared to steel reinforced concrete beams. In general, the performance produced by bamboo reinforced concrete blocks can be said to be good with a significant increase in beam ductility.
Development information system for building maintenance for structural components of government green building using Building Information Modelling (BIM)
Authors: Arisanti K , Latief Y , Machfudiyanto R A
Published: May 2020

Structural components are the most important components in building from the stages of design-construction-maintenance. The failure of structural components will result in the reliability and function of the building not being achieved. Therefore, maintenance of structural components is one important factor to maintain and achieve the reliability and the function of building. This research discusses about maintenance system in government green building that are not implemented properly due to poor maintenance schedule, undocumented data and no history of maintenance checks stored. Maintenance of structural components that aren’t implemented properly can lead to increased operating and maintenance costs, and potentially increases the risk of building failure. The purpose of this research is to increase the maintenance performance of structural components of government green building. The case study in this research is Ministry of Public Works and Public Housing’s Building which is one of the government green building in Indonesia. The methods that used in this research are literature review, case studies and surveys done by questionnaires from structure’s experts and Greenship Professional. Result of this research in the form of integrated information system development using BIM is expected to facilitate users to improve performance in maintaining structural components of green building.
Effect of water-cement ratio on fracture energy based on work of fracture
Authors: Arianti A D , Muin R B , Patty A H
Published: May 2020

Concrete is brittle material which generally consists of many micro cracks which are a potential source of crack propagation which leads to possible catastrophic failure and resulting fracture of concrete structures under service loads. The relationship of fracture energy to material properties has not been clearly identified, with most studies showing a relative insensitivity to the water-cement ratio, and concrete cracks propagate mainly along the aggregate-cement interface. This research is an experiment about the effect of water-cement ratio on fracture energy based on the RILEM method. The fracture energy is measured by testing under three bend points with the notch depth ratio is 0.25 and loading rate is 0.05 mm/sec using a closed-loop testing machine to produce load-displacement curve. Concrete used crushed stones with a maximum size of 19 mm which was tested at 56 days of age and has a water-cement ratio (w/cm) of 0.30, 0.40 and 0.6. The correlation between fracture energy and water-cement ratio are insensitive to each other. This can be seen when concrete containing a lower water-cement ratio (0.3) tends to have increased compressive strength but decreases fracture energy.
Creative adoption of Sundanese traditional architecture for architectural and campus interior design development
Authors: Barliana M S , Cahyani D , Mardiana R
Published: May 2020

This research aims to explore the content of values, patterns, and characteristics of traditional Sundanese architecture. The results of exploration creatively adapted and adopted to develop the architectural and interior design of the regional campuses of the Universitas Pendidikan Indonesia (UPI). The first year of research included the location of UPI Cibiru, Sumedang, and Tasikmalaya campuses. The ethno-architecture approach, analysis of content and historical-qualitative observations of the philosophical conceptual aspects and cultural artifacts of traditional Sundanese architecture are carried out. Based on these observations, creative interpretation and adoption carried out to guide the development of architecture and interior design for UPI regional campuses.
The effect of Ground Granulated Blast Furnace Slag (GGBFS) on Portland cement type II to compressive strength of high quality concrete
Authors: Puspita N , Hani’a A I , Fauzi M
Published: May 2020

Failure of concrete in the environment which containing sulphate causes damage to the cement bonds. One of environment that contains sulphate is peatlands. Peat water has a low acidity (pH) that it can damage the concrete slowly from the edges and corners with release of granules and becomes a porous. On this research, Ground Granulated Blast Furnace Slag (GGBFS) is a mineral additive that used as an additive to reduce the damage. The purpose of this research was to determine the effect of using variations of GGBFS and the optimum percentage of using GGBFS on Portland cement type II. This research outline divided into several stages, i.e. material testing, manufacturing cylindrical specimens with addition 0 %, 2%, 4%, and 6% of GGBFS and concrete age 7,14, 28 days, testing of specimens and analysing test result. Also, the treatment of specimens carried out using peat water. The result show that GGBFS increased compressive strength of the concrete, however it decreased at addition 2 % and 6 % of GGBFS on 7 days with amounting to -14.62% and -3.47%. The optimum percentage is concrete with variation of 4 % GGBFS and the minimum percentage is concrete with a variation of 0 % GGBFS.
Stakeholder management in sustainable rural electrification program: A review
Authors: Hidayah S N , Rarasati A D
Published: May 2020

Renewable energy utilization is recognized as a way to increase energy access for rural and remote areas. However, such efforts depend not only on the economic and technological aspects but also the support of society and respective stakeholders. Some studies have focused on managing stakeholders in wide scope energy projects but studies in relation to rural electrification program (REP) schemes seem to be lacking. To help understand the wider scope of rural electrification, this paper analyses a range of past and current research development on this domain and places the literature on the framework of stakeholder management (SM). The review indicates that SM in relation to REP is identified under three major themes namely stakeholder influence, stakeholder identification and classification, and stakeholder involvement.
Experimental study of 90° hook and standard hook at the end of reinforced concrete beam stirrup
Authors: Susanto A , Kasyanto H , Susilahadi S
Published: May 2020

Part of shear forces on reinforced concrete structures, will be borne by stirrup. According to Indonesia concrete standard, a closed stirrup must be used in earthquake prone areas. The end of the stirrups should be a hook with an angle ≥ 135°. The focus of this research is the modification of the hook shape on the stirrup reinforcement. This research is expected to design the shape of hook which good performance on shear holding. The basis of this research is experimental testing in the laboratory by cyclic loads. The specimens consisted of 2 pieces: TG1 and TG2. TG1 is a specimen with an angle135° end-hook shape according to SNI provisions. TG2 is a specimen with an angle 90° end-hook shape. The two specimens are reinforced concrete beams (250mm x 400mm x1700 mm). From the test, it is proofed that the two specimens are collapsed by shear. The ultimate load on the second specimen is greater than the ultimate load of first one, Pu1 = 245 kN and Pu2 = 270 kN. In addition, the deflection of the second specimen is greater than the deflection of the first one, δ1 = 12 mm and δ2 = 14 mm.
Analysis of safety cost structure in infrastructure project of precast of precast concrete bridge based on Work Breakdown Structure (WBS)
Authors: Saputra P D , Latief Y
Published: May 2020

The Indonesian construction industry has increased due to the policy of infrastructure projects acceleration. Construction is a dangerous industry that often takes casualties. In recent years there have been many accidents in the precast bridge projects, which have caused moral and material losses, projects were stopped and delayed. Separate budgets that are not specifically prepared in implementing the Occupational Safety and Health Management System (OHSMS) is one of the causes of the poor implementation of OHSMS and create high rates of accidents. Thus, the financing of OHSMS was taken from the project budget, which led to a reduction in the profits. The aims of the study are determining the work breakdown structure (WBS) in precast bridge project, identifying hazards and risks, developing safety plans, identifying safey costs components and calculating of safety cost. This research is a survey research with respondents of experts in construction safety, descriptive analysis is used to determine variables. A case study approach is also used to calculate safety costs. The results of this study are the precast bridges standardized WBS, safety plan to each hazards and activity, finding the safety costs components based on WBS, and the percentage of total safety cost Kundur Bridge is 3,21%.
Analysis of safety cost structure in infrastructure project of cable stayed bridge based on Work Breakdown Structure (WBS)
Authors: Putra A S P , Latief Y
Published: May 2020

The development of infrastructure in Indonesia is currently quite massive, in accordance with the Government of Indonesia’s policy in accelerating infrastructure developments. However, along with the increase in the construction sector, work accidents in the construction sector also increased. Cable Stayed Bridge is one of the excellent technologies in connecting islands but has a high potensial hazards and risks and it can cause fatal accidents. Accidents can be prevented through a good occupational safety and health management system (OHSMS). The application of OHSMS financing in Indonesian construction sector, especially in the cable stayed bridge has not been clearly and measurably regulated. In its implementation, the existing regulations have not yet been fully followed by the construction actors. This study aims is to develop the safety cost based on Work Breakdown Structure (WBS). The research method are survey research and descriptive analysis. The study results are the cable stayed bridge standardized WBS, potential hazard sources, the preventive action to each potential hazards in each activity, finding the safety cost components based on WBS and the calculation of safety cost percentage in order to improve the OHSMS quality and reducing work accidents in the cable stayed bridge projects.
Spatial patterns of hotel’s occupation rate
Authors: Ghozali A , Syafitri E D
Published: May 2020

In Balikpapan the growth in the number of hotels increased significantly over the past 10 years but the income earned from this sector has tended to decline. Currently, it is found that hotel development growth becomes imbalance due to overcapacity and only exist in several regions. This study aims to identify hotel distribution patterns and hotel location clustering analysis based on the occupancy rate conducted in two stages using the Average Nearest Neighbor (ANN) and hot spot analysis method. In overview, hotels in Balikpapan, both star hotel and non-star hotel, significantly clustered spatially around the centers of urban activities. This grouping is not linear with the occupancy rate distribution pattern. The occupancy rate pattern of star hotels shows a spatially clustered structure with z-score to 2.69 (most significant). Conversely, the occupancy rate of non-star hotels has a random pattern with a z-score is closest to 0 (not significant). However, in general, the constructed hotels in an area which has high accessibility and closes to urban centers is the hot spot point for significant high occupancy rates.
The role of Wi-Fi network in producing social space in Mentri Supeno Park Semarang, Indonesia
Authors: Rahman B , Putri A R
Published: May 2020

Mentri Supeno Park is an open public space in the form of a park located in the middle of the city in which its position is a strategic location as a social space. This park has various facilities, one of them is the Wi-Fi Network. A combination of open space and Wi-Fi has become a necessity in almost all levels of society to form community activity points that spread to both individual and groups on each side of the park. The purpose of this study was to find out how the role of Wi-Fi in generating social space in open spaces in the park, so it could be known the types of created social spaces and management of spaces that were obtained. This study used a qualitative method with a behavioral mapping approach as its analysis technique. The results of this study showed five types of social space activities, with types of individual and collective activities. With the results obtained, it is expected to provide recommendations for the management of social space, so it does not lead to uncontrolled things. Moreover, it can help build the character of the community and align with the regional development agenda.
Web based management information system for electrical engineering final project students of State Polytechnic Bandung, Indonesia
Authors: Sudarsa Y , Sukandar E , Supriadi T
Published: May 2020

This purpose of this research is to develop the web based Final Project Student MIS application for electrical engineering students at Bandung of State Polytechnic in handling the final project students. The system is called the MIS SePaKaT TA (Sistem Pengambilan Keputusan Terpadu Tugas Akhir). The process of implementation of the system is based on the Waterfall Method that is a breakdown of project activities into linear sequential phases, where each phase depends on the deliverables of the previous one and corresponds to a specialization of tasks. The Final Project Student MIS Application is a best solution because it’s support on time correctly without delays and informing online all classified users. In addition, the system provides with Decision Support System (DSS) to decide students eligible for examination based on requirements. Other advantages of the system is less paper usage and less people to manage.
Narrowband-IoT network for asset tracking system
Authors: Bima W I W K , Suryani V , Wardana A A
Published: May 2020

Narrowband-IoT is one of the emerging LPWAN technologies in the market. Traditionally asset tracking employs Global Positioning System (GPS) and General Packet Radio Service (GPRS) connections to send telemetry data to database servers. Compared to GPRS, NB-IoT has a smaller power usage, given proper implementation. This paper discusses NB-IoT implementation in asset tracking applications. Our test includes these parameters: latency, throughput, packet loss, and power usage for both technologies. The result obtained showed that NB-IoT was underperformed in HTTP but in UDP test, NB-IoT showed better power consumption compared to GPRS (0.352 W vs. 0.542 W) even though both have similar uplink throughput (around 350 B/s). From these findings, this new cellular standard is deemed appropriate in the Asset Tracking application, given the correct protocol and architecture.
Optimization of RSA encryption and decryption process with distributed computing method
Authors: Arief S N , Firdaus V A H , Prasetyo A
Published: May 2020

Mathematics equation of the RSA is the complicated one between the other asymmetric encryption methods. It makes the RSA method needs more resources than the others. Most existing studies are trying to make another encryption method that need less computational resources, but it is less secure than using the RSA algorithm. In this paper, we proposed the Distributed Computing method to accommodate the limited computing resources in a single worker. We will distribute the computational process of RSA encryption and decryption to numerous workers. The test results showed that the implementation of Distributed Computing method made the encryption and decryption process finished faster. In conclusion, it increased completion time, made the encrypted data serve faster, and maximized the computational resources.
The optimalization of backpropagation neural networks to simplify decision making
Authors: Purba R A , Samsir S , Siddik M , Sondang S , Nasir M F
Published: May 2020

Private or public companies need tools to make easy decision making process. This research conducted at PT. FIF Medan. Focus in decision making to provision motor vehicle loans. The study do because PT. FIF Medan has problems to determining whether consumers are given financing. Research using Back Propagation Neural Network. Back Propagation Neural Network is a method that simplifies complex problems. Simplifying model by taking the most essential core issues. Research will be carried out with the stages of identifying problems, determining needs, analyzing, and choosing alternatives. 8 (eight) criteria will be parameters, including the amount of dependents, length of work, home status, history of finance, employee workplace, vehicle type, financing tenure, and monthly income.
Designing user interface using user-centered design method on reproductive health learning for visual impairment teenagers
Authors: Priowibowo B , Effendy V , Junaedi D
Published: May 2020

One of the non-profit organizations that have concerns in reproductive health education for high school teenagers provides materials about reproductive health on its website. However, it is not accessible for visual impairment teenagers, for example, the picture cannot be read by screen reader software, and the absence of reproductive health learning that specifically for the visual impairment teenagers causes the lack of comprehensive learning and lack of independent learning for visual impairment teenagers. Android-based application of reproductive health learning will be developed to reduce effort such as opening a browser and typing the e-learning address. The application designed to implement multimodal interaction, that can become natural interaction involving several human senses in using applications that offer flexibility, efficiency and the use of a usable environment. The application allows the user to interact through several inputs such as touch, or gesture and get an output as a sound. In this study, the User-Centered Design method had used, so the design can be focused on the user. The user interface model had tested with USE questionnaire parameters that reach an average usability percentage 87.4%, it shows that usability obtained in the excellent category.
Mortar fire direction with multiplatform mobile application
Authors: Utomo S , Iswanto I , Ramsari N
Published: May 2020

Mortar is one of the weapons that is still used for warfare. In determining the direction of mortar firing there are still using conventional method with plotting board. Then it takes a portable calculator that is quick and accurate in determining the angle of elevation and angle of azimuth. So it is proposed that this mortar fire direction is a mobile application with multiplatform development method that can run on Windows, Android, and iOS operating systems. The result of this research is a prototype mobile application that provides a report of elevation angles and azimuth angles rather than mortar quickly and accurately to the intended goal.
A comparison of classification algorithms for hate speech detection
Authors: Putri T T A , Sriadhi S , Sari R D , Rahmadani R , Hutahaean H D
Published: May 2020

Freedom of opinion through social media is frequently affect a negative impact that spreads hatred. This study aims to automatically detect Indonesian tweets that contain hate speech on Twitter social media. The data used amounted to 4,002 tweets related to politics, religion, ethnicity and race in Indonesia. The application model uses classification methods with machine learning algorithms such as Naïve Bayes, Multi Level Perceptron, AdaBoost Classifier, Decision Tree and Support Vector Machine. The study also compared the performance of the model using SMOTE to overcome imbalanced data. The results show that the Multinomial Naive Bayes algorithm produces the best model with the highest recall value of 93.2% which has an accuracy value of 71.2% for the classification of hate speech. Therefore, the Multinomial Naïve Bayes algorithm without SMOTE is recommended as the model to detect hate speech on social media.
Data security system using hybrid cryptosystem RC4A-RSA algorithm
Authors: Rahmadani R , Putri T T A , Sriadhi S , Sari R D , Hutahaean H D
Published: May 2020

Data confidentiality is an important aspect of information systems. In case of that we need an application to maintain data confidentiality. This study aims to compare two methods of data security systems, namely using the RC4A algorithm which is a symmetric key cryptographic algorithm and the RSA algorithm which is an asymmetric algorithm with a hybrid process on the RC4A and RSA algorithms to secure the secret key of RC4A and speed up the encryption process of RSA. The study uses a comparative test on two algorithm methods, according to data security system parameters. Data is encrypted with the RC4A algorithm and the RC4A key obtained from KSA RC4A will be encrypted with RSA before sending to the receiver. The test results get Hybrid cryptosystem RC4A-RSA faster in completing the encryption process than RSA. Furthermore, the RC4A key can be secured by being encrypted using the RSA algorithm.
Predicting university students’ behavioral intention toward electronic train ticketing system using Technology Acceptance Model
Authors: Kusdibyo L , Amalia F A , Senalasari W , Kania R
Published: May 2020

An online train ticketing system, called KAI Access, has been introduced by Indonesian Railways despite some other online platforms introduced earlier by private service providers. While the older generation may still have difficulty in using the online platform, the millennial generation, mostly university students, are faster in mastering the platform, including the online ticketing system. The purposes of this study are (1) to determine university students’ perception of the Technology Acceptance Model (TAM) variable and (2) to measure the effect of Perceived Ease of Use, Perceived Usefulness and Attitude towards Usage variables on Behavioral Intention. Questionnaires were distributed to university students who have used KAI Access. From 350 data collected, 335 data were valid for further analysis. Variance-based SEM PLS was used to determine the relationship between variables. The results show that Perceived Ease of Use and Perceived Usefulness have a direct positive and significant effect on Behavioral Intention, while Attitude towards Usage has no significant influence on Behavioral Intention. The implication for management is to provide a better ticketing system which can create users’ positive attitude to use it. Further research may compare several online ticketing service systems and involve other variables to predict consumers’ attitudes and behavioral intentions.
Simulator Human Machine Interface (HMI) using visual basic on the SCADA system
Authors: Fitriani S , Sofyan Y
Published: May 2020

Recently, many industries are using Supervisory Control and Data Acquisition (SCADA), especially in the electrical industry. SCADA system is a computer based in control and monitoring system. This research is proposed to design a Human Machine Interface (HMI) on the SCADA system for power plant. However, due to the high cost of HMI as used in the industry, a simulator HMI was built. The objective of this study is to design HMI simulator by using Visual Basic to simulate controlling process as similar as in the real plant. The strategy to examine the performance of HMI simulator is manipulating data from analogue data contained in a three-phase plant simulator and converted into the real SCADA scale and displayed. Based on the experiment, the performance of HMI simulator is following what it should be, where the entered data from the RTU to the HMI is running well and can displayed on a computer.
Sentiment analysis of public opinions on the welfare of honorary educators using Naive Bayes
Authors: Lazuardi D R , Munandar T A , Harsiti H , Mutaqin Z , Hays R N
Published: May 2020

The development of the internet in Indonesia is very rapid, this is marked by the number of emerging social media. One of the most popular social media is Twitter. Many Twitter users who tweet their expression and opinion on a product, service, political issues or things that are trending. Even the current government is not spared from public comment on social media, one of which is an honorary teacher at an elementary school in Pandeglang Regency, who lives next to his school toilet. This case was widely discussed by almost all Indonesians through offline and online media, especially on social media. The impact of this case is the difference in response in the form of public sentiment towards public services, especially in improving the welfare of educators. Various sentiments of Netizens (internet users) appear on social media ranging from praise, criticism, suggestions, satire and even expressions of hatred towards the Pandeglang Government. This research was conducted to determine netizens’ sentiments towards the Pandeglang Regency government based on the case of honorary teacher news in Pandeglang Regency who live in school toilets. The approach used is Naive Bayes. The results of sentiment analysis showed that there are 16 Twitter posts grouped in neutral class, 19 posts in positive class and the remaining 16 posts are in the negative class. The level of accuracy generated from the sentiment analysis model formed is 88.24%.
A service application prototype of citizen portal apps (C-PORT) for improving local government public services
Authors: Harsiti H , Munandar T A , Malik A , Setyawan A
Published: May 2020

Government services to community are not properly carried out without participation and liveliness of governmental units which have been set up based on their duties and service function. The reason is that they are the spearheads of the government services to community, especially in public services. The intended public services are focused on customer satisfaction (customer-driven government). In order to successfully achieve customer satisfaction, it is necessary to get feedback from community as service users so that government as service manager may cognize some complaints about the public services that have been provided. The community feedback can be delivered through complaint services that can be directly responded by the intended unit works. The aim of this study is to develop citizen portals (c-port) apps for service complaints to support public service management in order to realize the concept of smart districts based on local wisdom. The application has developed in android based as front-end for user (citizen) and as web-end for government and related regional work units. The result of study is a prototype, a product of citizen portals (C-Port) software as a mean of communication and media for government to provide services to wider community.