bluuebunny/crossref_metadata_2025 huggingface dataset:
Reactive power compensation in squirrel cage rotor type of three-phase induction motors
Authors: Tjahjono G , Ray F G , Fahmi I , Tamal C P , Modok R H , Setiawaty T
Published: May 2020

The purpose of this study is to produce: (1) The average real power in squirrel-cage rotor type of three-phase induction motor load. (2) The average reactive power in squirrel-cage rotor type of three-phase induction motor load. (3) The best capacitor value for saving reactive power in squirrel-cage rotor type of three-phase induction motor load. The research method used is a quantitative description approach by applying measurement methods in the Laboratory of Department of Electrical Engineering Education, Nusa Cendana University, Kupang. The study population was the entire squirrel-cage rotor type of three-phase induction motor controller using the star to delta method. The sample is a number of measurements of voltage, current, and power ion n a three-phase induction motor using the star to delta method. The conclusions of the research are: (1) The average real-power for delta-connection load without capacitor obtained a value of 24.4 [Watt]. The average reactive power for delta-connection load without capacitor obtained a value of 205 [VAR]. (2) The average-real power for delta-connection load with the capacitor of 11.57 [µF] obtained a value of 9,9 [Watt]. The average reactive power for delta-connection load with the capacitor of 11.57 [µF] obtained a value of 9,4 [VAR]. (3) Capacitor value 11.57 [µF] is the best value for reactive power savings in squirrel-cage rotor type of three-phase induction motor.
Utilization photovoltaic for electrical energy needs in Kelapan island, Indonesia
Authors: Pansuri I , Sunanda W , Gusa R F
Published: May 2020

Kelapan Island is one of the outermost islands in the Bangka Belitung Province. With a total of 30 households consisting of 120 people, electricity is currently from diesel generators. The dominant electrical equipment used on Kelapan Island are lights, televisions, fans, irons also several units of refrigerators and washing machines. For reducing the use of fossil energy, electrical energy sources are modeled for supply using a photovoltaic system. The average amount of electricity needed per house is 290.9 W, so the amount of power required for 4 hours at night is 34.908 kWh. The photovoltaic system will be modeled in 2 stages, centralized photovoltaic and photovoltaic at each resident’s house. The photovoltaic system that is installing in each residential house requires four units of 100 Wp solar panels, six units of 100 Ah batteries, 1 unit of a 400-watt inverter, and four units of solar charger controllers. Whereas for the centralized photovoltaic system model requires 97 units of 100 Wp solar panels, 160 units of 100 Ah batteries, 25 units of 400-watt inverters and 108 units of solar charger controllers.
Internet of Things (IoT): Web learning for smart school system
Authors: Rukmana A A , Mulyanti B
Published: May 2020

The Internet of Things (IoT) which is known today has grown rapidly, the integration of each object can be connected via the internet. With the sophistication of the IoT system also has an impact on the world of education which is currently still using manual systems, smart technology owned by IoT has changed the existing system. The purpose of this paper is to analyze and collect data about IoT that is currently developing at school. IoT can be used as a learning management system where web-based learning is the main focus. The method used is a literature review from journals related to IoT, web learning for smart school systems. The findings obtained are the integration of IoT with web-based learning, namely administrative services, service management, data analysis and learning services. These results can be used in education.
A technical and economic analysis of solar PV with local tariff policy in Indonesia
Authors: Adam K B , Ramdhani M , Suhartono E
Published: May 2020

Indonesia is still struggling to attract investors in developing the solar photovoltaic (PV) project. The government issued the first regulation on solar PV, announced in 2016. A revision on the local tariff regulation is conducted to reduce the rapid development of the solar PV investment. The major revision is made to change the contract scheme from a build-operate-own (BOO) to a build-operate-own-transfer (BOOT) scheme. This paper investigates how the new local tariff will drive investors and developers to invest in solar PV. This analysis is conducted to know the effectiveness of the policy and the risk of PV investment in Indonesia. Local tariff policy regulation targets PV developers to invest in the solar PV system areas. In the local tariff policy, each area has its PV energy tariff determined by the government. This research proposes a method for deciding demand by considering population data in selected regions to calculate the maximum PV demand of each area. The Levelized Cost of Energy LCOE is used to calculate the economic viability of the PV projects in selected areas in Indonesia. The results show that more than half of the selected areas are profitable for the PV project. The average profit of the projects of the selected areas is 3.21 cent USD per kWh. Most of the areas that have high PV demand have lower local tariffs. Therefore, these areas may not be profitable for developers. The new regulation also cuts the revenue significantly due to the new scheme contract.
A prototype of solar panel position control system based on image processing
Authors: Rahmawati D , Priharti W , Mardiana M I Y
Published: May 2020

The position of the solar panel towards sunlight is very influential on the electrical energy production. The solar panel orthogonal to the sunlight is the best position to produce electrical energy. The aim of this research is creating a prototype of the solar panel position control system. The expected position of the system is solar panels are always perpendicular to the sun. In this research, we used image processing to control the solar panel position. We used a webcam to capture a shadow image of a 4cm bolt that placed on a flat plane. Then, the image from the shadow is processed to get the angle of the sun. We use trigonometric formulas to convert bolt shadows into angles. After that, the angle used as input for the solar panel drive motor. Thus, the solar panel can be adjusted to follow the angle of the sun. So that the positions are orthogonal to each other. The research finding discovered that the prototype can always follow the direction of incoming sunlight with an accuracy rate towards the center point is 95% for azimuth (X-axis) and 96% for altitude (Y-axis).
Methods of determining safety boundary and PPE by analysing arc-flash incident energy in medium voltage panels
Authors: Mashar A , Mulyadi A D , Gifari D
Published: May 2020

Arc-flash events still occur frequently in industries especially in Indonesia and there are many operators and technicians have got burn injuries caused by it. To avoid this accident, this paper discus about arc flash and its incident energy as well as personal protective equipment (PPE) should be worn by those working with electric panels (switchgears). To demonstrate how incident energy is calculated and the protection boundaries are determined, a 6 kV, 3750 kVA utility panel in a geothermal power plant (60 MW) is used as object. The steps have to be done in this research are bolted fault current and arc fault current calculations, calculation of incident energy and determining both protection boundaries and the relevant PPE. As result, it is found that with protection setting clearing time of 0,12, the incident energy is 4,418 J/cm2 and the protection boundary is 1.4 m. The danger will increase with longer clearing time of relay or closer distance to the panel. This paper will hopefully be very help full for the responsible engineers to analyse the danger of any kind of panels and to determine PPE for workers.
Gene mutation detection for breast cancer disease: A review
Authors: Wisesty U N , Mengko T R , Purwarianti A
Published: May 2020

Breast cancer is one of the most common diseases suffered, especially by women, in the world, and about two billion new cases of patients with breast cancer in 2018. Therefore, it is very important to detect cancer early. Early detection of cancer can be done through the analysis of DNA abnormalities from blood cell samples, where the sampling does not require surgery, non-invasive and painless, and can reduce the sampling cost. DNA abnormalities can occur due to heredity or gene mutation. This paper presents a systematic review that includes an explanation of DNA sequences, gene mutations that occur in breast cancer, and bioinformatics techniques for detecting breast cancer. From several studies that have been conducted in the medical field there are mutations in the BRCA1, BRCA2, and PALB2 genes, where mutations in these genes can cause an increased risk of breast cancer. Other gene mutations associated with cancer risk are ATM, BARD1, CDH1, CHEK2, MRE11A, NBN, TP53, PTEN, RAD50, RECQL, RINT1. In bioinformatics, breast cancer detection based on DNA sequence data is carried out in three phases namely data mapping, feature extraction, and prediction / classification. The methods that can be used are Voss mapping and its variations for data mapping, statistical feature representation approach and Wavelet analysis for feature extraction, and regression approaches, probability models, Support Vector Machines, Neural Networks and Deep Learning for classification.
Biomechanical analysis on human gait and posture for development of floating backpack
Authors: Putra N K , Khagi H , Sriwarno A B , Suprijanto S
Published: May 2020

Floating backpack system or also known as suspended-load backpack has been known as a new type of backpack which able to reduce the effect of impact force from the loads carried in the backpack while walking or running. Particularly on the application for military or rescue team, this new backpack design claimed to improve the comfort and reduce the burden on the skeletal muscle as well as the risk of injury. In this research, we try to assess the biomechanics performance of our novel floating backpack design on reducing the impact force on the wearer by firstly analyzing the human gait cycle and posture adjustment. This analysis conducted by motion analysis method which able to track the change of position of certain points while walking and running. We tracked several points on the volunteer’s lower extremity and analyze its kinematics information throughout the walk and running cycle with a different pace and velocity. From this data, we try to get the standard gait model as a mechanical input force for the floating backpack system. Furthermore, with this 3D analysis we can also analyze the posture adjustment as the balancing mechanism of human body to compensate the different forces from the different state of walking-running cycle. A sinusoidal pattern with a frequency of 2-3 Hz are measured on the transition phase of walking and running, while the maximum amplitude was varying on throughout each cycle phase
Preliminary design of the implementation of automatic antenna radiation pattern measurement: Study of Yagi antenna radiation pattern
Authors: Simanjuntak A B , Mulyanti B , Juanda E A , Abdullah A G , Supriyadi T , Nurhakim A , Ramdhani M
Published: May 2020

The radiation pattern is an important parameter of the antenna performance. This parameter needs to be measured not only accurately but also as fast as possible. For this purpose, the automatic measurement system has been developed. In this research, the system is implemented to analyze the radiation characteristic of a Yagi antenna by measuring its radiation pattern. The measurement result of the patterns is compared to those of the table characteristics of the Yagi antenna as well as a computer simulation. For this purpose, a Yagi antenna is designed and realized as the radiation pattern measurement object. Then, the students experiment to measure and analyze the effect of parasitic elements on the radiation pattern performance of the antenna. The questionnaire is carried out as the method of the research and directed to the students of the Telecommunication Study Program, Bandung State Polytechnic, to get the perception of the object performance.
Comparison of online group discussion and class discussion learning for a soil mechanics class
Authors: Rachmawati T S N , Priadi C R , Sagitaningrum F H , Swantika B , Mairizal A Q , Abdillah A , Santoso H B , Junus K
Published: May 2020

Soil Mechanics had been a fundamental science material that needs a great understanding of the concept. Many attempts had been done in varying the study method for this course. An attempt to utilize online discussion learning will be discussed in this paper. To analyze the online learning experience, the Community of Inquiry (CoI) model was utilized. The CoI model divides the dynamic online learning process as social presence, teaching presence, and cognitive presence. This study aims to compare the application of CoI in the Soil Mechanics course between two different types of discussion under the Civil Engineering Department at a large public university in Indonesia. The students of the Soil Mechanics course were given two types of problem-based online discussions for two learning topics. The first one was a case study of Consolidation Settlement in a Group Discussion, while the second one was a case study of Seepage in a Class Discussion, which was done in one single discussion forum. Through quantitative analysis of the students’ discussion transcripts, it was found that cognitive presence was dominantly higher than teaching presence and social presence in both types of discussion. Finally, through an interview with students, it was found that students with active participation gain several benefits, among others, the better ability of systematic and critical thinking of interpreting a problem and growing sense of engineering compare to passive students.
Development of machine learning implementation in engineering education: A literature review
Authors: Sasmita F , Mulyanti B
Published: May 2020

This study has aims to determine the development of implementing machine learning in several engineering majors. The used method was a literature study, and secondary data was used from reputable international journals and published in 2015 to 2019 from each publisher, which is IEEEXplore, Springer Link, Science Direct, ERIC, and Google Scholar. The author was summarized and analysed articles obtained based on the year of publication and the context of the article. Results show that machine learning has been widely applied in engineering education through fourteen contexts, one of which is Prediction Student Academic Performance, which has continuous development from 2013 to 2019. And the total number of engineering majors that are implementing machine learning was 13 majors. This research was expected to be an illustration, reference, and consideration for technicians in engineering education to give more attention and can be applied in schools, universities, and other engineering institutions in Indonesia country.
Line follower robot module design for increasing student comprehension in robotics
Authors: Budiyanta N E , Darmawan I A , Sarah A , Mulyadi M , Tanudjaja H , Widiarto S O B
Published: May 2020

The use of instructional media is a very important aspect to consider in teaching practice. This study aims to design an effective robotics learning media among adolescents as an effort to socialize robotics technology. This study used a research development model of learning media that can be used to make effective and fun robotic learning. The development of learning media is carried out based on several stages, namely Analysis, Design, Development Implementation and Evaluation (ADDIE). The results of this study indicate that the designs made in general are in the excellent category with an average value of 86.3%. The application of learning media can also be said to be effective with an increment value of 36.83% compared to the learning activities previously carried out. Therefore, robotic learning media in the form of a line follower robot module is one of the learning media that can be used to improve student understanding in robotic learning.
Identifications of increase, distribution pattern, and density level of sedimentation using Landsat 7 satellite images in the coastal area
Authors: Thobibie T , Astor Y , Julianto H
Published: May 2020

Sedimentation at coastal of Cirebon City is caused by considerable abrasion process in Indramayu regency and the impact of sand mining on Gosong Island, Indramayu Regency, besides that, the habit of residents in coastal of Cirebon City who heap up garbage at the coastal for years to utilize the area for residential purpose also contributed significantly the problem of sedimentation in the coastal area of Cirebon City. This research applying remote sensing technology of Landsat 7 2005, 2010, and 2015 using Lemigas Algorithm to gain information of special and temporal increase of sedimentation, distribution pattern, and density level of sedimentation. The result shows that the most significant increase of sedimentation happened at 2010 to 2015 with 46,072 Ha. There are 2 types of distribution pattern at Cirebon City, the first one is the sedimentation that ends in the estuary of river. The other type is the sedimentation caused by the presence of longshore currents which carry sediment and stuck on the coast along coastal of Cirebon City. Identification of natural and artificial sedimentation is carried out based on surveys in the field. The Lemigas Algorithm used only for classification of sedimentation based on density level of sedimentation content (mg/L). This research contributes to the Cirebon City government in resolving the problems of abrasion, accretion, and siltation in coastal areas, for the development of the Cirebon City coastal area to be an asset supported the economy in the future.
Utilization of post mining land towards sustainable development
Authors: Hendrakusumah E , Chamid C , Sukmayaningrum I
Published: May 2020

To avoid the post-mining environmental impacts, the government has made regulations related to the exploitation of mining land. But in reality, there are many disregards to this regulation, so that a lot of post-mining land is left alone, as if it cannot be utilized anymore. But not so with the people in Cibeureum Village in Sumedang Regency, they are very concerned and have been able to take advantage of the post-mining land in their area well even with simple technology. This paper aims to identify the post-mining land reclamation practices above, especially the main driving factor of the local community in their willingness and ability to reclaim the post-mining land so that they can successfully utilize the post-mining land. The method used in this activity is literature study, participatory observation, in-depth interviews, and focus group discussions. The results show that the main thing behind them is the collective awareness of the community as the main social capital in utilizing land. Thus, it can be understood that if all life and livelihoods in society are based on shared virtue values as social capital, it can minimize disregard for natural resources.
Geospatial modeling analysis of potential inundation impact of sea level rise: A case study of south coast Yogyakarta
Authors: Khafid M A , Wicaksono A P , Saputra D R , Andita F W , Wibowo D S
Published: May 2020

Increasing human activity leads to increased concentrations of greenhouse gases in the atmosphere, especially carbon dioxide (CO2) and methane (CH4) that impact climate change and global warming. This condition encourages the occurrence of weather anomaly phenomena in the atmosphere such as rainfall fluctuations, dryness, an increase in air temperature and sea-level rise. Sea-level rise was a potency of seawater inundation that gave an impact on land degradation. The study aimed to determine sea-level rise used three variables of disaster with two cumulative scenarios. The toward step used the simulation using a raster calculator in ArcGIS 10.2 to analyze the impact of sea-level rise to inundation disaster. The results showed that the sea-level rise on the South Coast of Yogyakarta based on (1) Scenario 1A (existing) was 1.4457 m (the prediction year 2030) and 2.0827 m (the prediction year 2050). According to the scenario (2) 1B (extreme) is 1.6297 m (the prediction year 2030) and 2.2667 m (the prediction year 2050). The increase in the sea-level rise on the south coast of Yogyakarta provides a disaster effect of inundation in the area directly dealing the beach and near the river mouth for example in Bantul Regency and Kulon Progo Regency.
Evaluation of environment carrying capacity as a coastal tourism using GIS in Sepanjang Beach, Indonesia
Authors: Wicaksono A P , Khafid M A , Fakhruddin F Z
Published: May 2020

The rapid pace of population growth in coastal areas and increasing the need for natural tourism can have a negative impact on the quality and quantity of natural resources and the environment in Sepanjang Beach, Gunungkidul regency. The phenomenon of seawater tidal waves led to a number of buildings along the beach experiencing heavy damage. The purpose of this research is to know the environment carrying capacity seen from the aspect of land capability and land suitability aspects as a tourist area, as well as providing recommendations that are right on Sepanjang Beach. The methods used are spatial analysis methods using geographic information systems (GIS) and scoring methods to determine the environment carrying capacity and land suitability. The results of the calculation of the environment carrying capacity based on the aspect of land capability were obtained by 2 classes of land capability namely moderate and good. Whereas seen from the results of the suitability of the beach recreation category shows if Tourism Suitability Index (TSI) has a value of 94% which means it is appropriate. However, it is necessary to arrange the gazebo building to use upland land in the form of alluvial karst plain.
Reducing customers’ lead time using Make to Stock and Make to Order approach
Authors: Prasetyaningsih E , Ardianto C D , Muhammad C R
Published: May 2020

This paper discusses about a company that adopts make-to-order strategy because the company does not have enough fund to provide raw material. The raw material is ordered when the order is received. It occurs a very long customer lead time due to the production process must wait for the arrival of material. Consequently, the company cannot meet the customer order at the due date, and the company should give a discount of 25 - 30% of the total purchases. This research aims at reducing customer lead time by determining a decoupling point. The result shows that the decoupling point is placed between the procurement of raw materials and the manufacturing process. The decoupling point denotes a boundary between the make-to-stock strategy in the previous process, and the make-to-order strategy for the process afterwards. The lead time customer is then considered start from the decoupling point to the due date.
Risk mitigation in raw material distribution activities using house of risk method in manufacturing
Authors: Liansari G P , Rajiman M S , Imran A , Ramadhan F
Published: May 2020

Supply Chain is a sequence of production processes, include raw material supply activities (inbound logistics), production processes, and distribution activities (outbound logistics). Every supply chain activity has risk. A risk mitigation strategy is important because the company will be able to identify the right strategy to handle those risks. Companies must be able to predict all risks that occur in supply chain activities, both of inbound logistics and outbound logistics. A manufacturing company in Indonesia that produces military and heavy equipment doesn’t have a risk mitigation strategy in raw material distribution activity, so this research proposes risk mitigation strategies using House of Risk method with Supply Chain Operation Reference (SCOR) models. Identification of supply chain activities involving of company’s plan, source, make, deliver, and return. House of Risk has two phases, first used to identify risk event, risk agent, and determine severity and occurrence value and calculating the Aggregate Risk Potential (ARP), second used for risk mitigation. Research results found there are 35 risk events, 51 risk agents, and three mitigation strategies that can be implemented in the company. Mitigation strategies, include: calculating the recording of revenue records for errors in the estimation of production capacity risk, procurement is not according to plan risk, and many damaged materials risk; improving the number of operators for errors in estimated production capacity risk; and Collaborative Planning, Forecasting, and Replenishment (CPFR) for error in MRP simulations risk.
Performance assessment analysis of UHF machines using Reliability, Availability, Maintainability and Safety (RAMS) analysis methods
Authors: Nurrahman F , Atmaji F T D
Published: May 2020

XYZ Company is manufacturing engaged in the rubber industry located in the city of Bandung, because economic growth and demand from consumers are increasing, making companies demanded to meet the target orders promptly. One way to minimize losses and the possibilities that must be borne by the company is to increase Reliability, Availability, Maintainability of the production and the safety value. Data in the form of Mean Downtime, Mean Time to Failure, Mean Time to Repair is useful for system performance that works. MTTF data can be used to assess safety systems found in PT XYZ with the safety standards of IEC 61508 using Safety Integrity Level. From the results of processing RAMS data using Reliability Block Diagram modeling based on the analytical approach, for 120 hours, the system has a Reliability value (91.12%). The average value of system Maintainability at t = 2 hours is 100%. The Inherent Availability value is 99,981% and the Operational Availability value is 99,980%. Based on the world-class maintenance Key Performace Indicator, leading and lagging availability indicators have reached the indicator target standard. Safety Integrity Level values from calculations based on PFD and RRF values of each system are in SIL 1.
Dynamic modeling of an inventory system to minimize of inventory cost
Authors: Satori M , Renosori P , Fauzan H
Published: May 2020

Recently business competition is getting tougher, especially concerning the fulfillment of consumer needs. Unstable market demand is often a challenge for companies in fulfillment of market demand. The study was conducted at PT TSJ, and the problem is when the supply is higher than the demand, the company will have to bear the holding cost. Meanwhile, when inventory is lower than the demand, the company must bear the cost of a product backlog. This research uses a dynamic system method with three scenarios: real situation scenario, raising the safety stock and reducing lead time. Results of the simulation are based on a real situation that shows the lead time from distributors to retailers and distributor safety stock has a major effect on the costs borne by the distributor and the longer the safety stock; results of the increase of the safety stock scenario shows that the backlog costs are reduced but the product as inventory at the distributor increases and thus the saving costs increases, and the result of reducing the lead time shows that holding cost at distributor reduced. The conclusion of this research shows that the best scenario to minimize the total cost is to reduce lead time.
Industrial development zone with assignment method
Authors: Nurwandi L , Renosori P
Published: May 2020

This study concern with finding new areas for potential industry that can be developed and characterizes the region. Five potential industries observe to be developed, namely fisheries, petrochemicals, food and beverages, handicrafts, and fashion, will be located in a zone, which has the potential to be the provincial capital of an island in Indonesia. The five potential industries will be assessed by five factors consisting of technology, transportation, social, policy, and economy. The phenomenon of determining which areas will be made, the area of industrial development by taking into account five sub-factors including the multi-criteria decision making (MCDM) where the decision to choose the developed industry depends on the assessment of stakeholder preferences, which consists of the government, the public, industrial actors, and investors with consider influential factors. In research the MCDM model used is the Analytic Hirarchy Process which will produce weights, then the weights are used as input to determine which industries are feasible to be developed using the assignment method. Research results show that food and beverage industry must be developed with focus on technology and economy pillars to enhance and support the community to keep the development and sustainability of region potential industry.
Parallel computation for production and distribution planning
Authors: Suahati A F , Wang K J , Nurrahman A A
Published: May 2020

Due to the TFT LCD (Thin-Film-Transistor Liquid-Crystal-Display) manifestation into many related products, this industry has been growing rapidly along with increasing demand. To satisfy the demand, most companies have increased their production capacity and capability by increasing their number of factories in different places and causing complexity in this industry. This research develops a production and distribution planning model for the multi-stage and multi-site supply chain in the TFT LCD industry. Genetic algorithm proposed in this research to solve the problem. Maximizing capacity utilization and total profit in the supply chain are become the major performance indicator in this model. Regarding the high computational effort of genetic algorithm, then parallel computation performed. Genetic algorithm conducted in multi-processor computation using OpenMP for time efficiency. To compare the computational time, the genetic algorithm conducted in five different number of processors; 1, 2, 4, 8, and 16, to know how many processors are needed to get the optimal computational time. The result is the genetic algorithm using 4 processors has the optimal expected net profit compare to the others. The result shows that a larger number of processors doesn’t mean the computation time will become automatically faster.
Knowledge of solid waste management through composting: A comparative study of rural communities in Malaysia and Indonesia
Authors: Anwar A , Amaranti R , Satori M , Salleh N A
Published: May 2020

Along with increasing human activity, the waste generated from these activities more and more. Waste at this time has become one of the causes of disasters in the world. One type of waste produced is organic waste. Organic waste is one of the solid wastes produced from domestic waste. Research is conducted to understand how people carry out organic waste processing into compost, to improve the quality of life, especially in economic terms. In addition, it can be identified factors and obstacles that affect the community when processing organic waste into compost. Primary data collection is done through interviews and field observations in selected rural communities. While secondary data collection is done by literature study. This research was conducted by taking samples in rural communities in Indonesia and Malaysia. The results obtained show a comparison of the patterns of success of rural communities in Indonesia and Malaysia in processing waste into compost.
Designing talent pool information systems at managerial level at PT. Pindad Enjiniring Indonesia
Authors: Renosori P , Wijaya B , Rukmana O
Published: May 2020

The background of this study is to determine human factors as key factors that are very important in increasing company competitiveness. The way the company manages this factor is by applying the concept of talent management. PT. Pindad Enjiniring Indonesia (PT PEI) is one of the companies that is implementing the concept, but obstacles are found at managerial level in the company, where the performance appraisal and potential are very slow. Meanwhile, the results of the assessment are needed to determine the right management for the employee’s career. Therefore, companies need what is called a Talent Pool. The term Talent Pool in Talent Management is a tool used as a talent centre to classify, recommend, and develop employee talent used by several companies or experts. In this tool, the classification process uses the HAV 5X5 Matrix which will be developed into an information system design using the FAST method. The Talent Pool design is expected to be a tool to present performance and potential assessments, speed up the assessment process to present the results of the assessment, classify results to determine employee competencies, and be able to be the best recommendation tool in determining an employee’s career path.
Alternative organic fuel determination with Analytical Hierarchy Process (AHP)
Authors: Nu’man A H , Nurwandi L , Bahtiar I , Omar S
Published: May 2020

Fuel is a main staple consumption of the industry, especially in Indonesia which is an industrial zone. Availability of fosil fuel is become decline day by day, according to that fenomena finding new fuel come from non fossil resources become important. This research is studied about finding potential fuel resources come from organic resources, such as cassava, cocoa, corn, pineapple, & potato. Factors that observed in this research namely availability of resources, social responsiveness, capability production, economy, technology, education, and policy. Data come from stakeholders that involved in produce, manage, and using the resources observed in the form of subjective preference. To anticipate the complexity of taking a decision in this research, analytical hierarchy process model used to formulate and proceed multi variable impact come from the factors that affected the determination new fuel resources to develop. The final result showed that an organic fuel resources determine by the biggest weight is policy factor. It means that people live around organic fuel resources must be supported first, by the government policy to operate the activity of transforming pineapple peel to be gasoline in the small scale industry.
The design of manual packaging work station based on workers’ dimension in beverage industry
Authors: Rejeki Y S , Achiraeniwati E , As’ad N R , Hadiid N
Published: May 2020

Manual packaging with awkward work postures has a high level of work risk with recommendations for improvement that should be done as soon as possible. Work risks that can be caused by awkward work posture are Musculoskeletal disorder (MSDs). Therefore, this study aims to improve the manual packaging work station by designing work tables and chairs based on an ergonomic approach so that it can improve work posture and reduce or even eliminate work risks. The research method used is a quantitative method with a descriptive approach. The results of this study are the design of tables and chairs with sizes obtained from the results of anthropometric measurements of workers. The results of this study imply that workers can do their jobs with good work postures so that work risks can be minimized.
Design of an on-off control system and a new display via internet based on Arduino Uno with application to window A/C
Authors: Erham E , Samudra R
Published: May 2020

Air Conditioner (A/C) is a system of air conditioning which serves need of thermal comfort inside a room. On one side, it is an advantage. However, on the other side, the energy consumption of A/C is the biggest in household appliances. In this paper, to solve the problem was designed the control system and display of A/C based on Arduino Uno. To do this, the Arduino was uploaded with a program of control system so that it can function as a controller. Whereas, the display as a monitor was designed using the Blynk that is supported a Smart-phone and Internet network. The results showed that the response of designed control system is able to maintain the desired temperature with range of error from 0.0°C to 0.2°C and the A/C can be set and monitored from far away via internet. In addition, although, a client and the A/C were separated by distance, the response was almost not delay and stayed accurate. Moreover, it was predicted that the using of proposed A/C in illustrated situation can save energy by 50%. It can be considered as a promising solution for the energy consumption issues.
Effect of leakage on refrigerant distribution in an air conditioned room using propane as working fluid
Authors: Muliawan R , Pasek A D , Lukitobudi A R , Sutandi T
Published: May 2020

Propane R-290 as hydrocarbon refrigerant has more benefits from the aspect of thermophysical properties, but the only weakness from this refrigerant is flammable. The distribution prediction of R-290 leakage to an air-conditioned room. The study using numerical simulation of CFD ANSYS FLUENT V.13. The distribution of R-290 with a leakage rate of 0,001kg/s and an airflow of 0,1m/s will run out after 600s, with 0,002kg/s will run out after 300s and with 0,005kg/s and 0,5m/s will run out after 120s. The mass flow rate can influence the refrigerant distribution of leakage effect flowrate. Airflow can increase the dispersion of refrigerant gas and decrease the level of the refrigerant amount at any certain point in the room after the refrigerant charge is empty. This momentum effect was due to the impact of supply air initial velocity. The buoyancy effect was due to R-290 density is greater than the air makes the refrigerant flows downward, accumulated, and stagnant. Make sure that the contactor relays and other electrical tools have the position, x=0 m ≤ x ≤ 1 m on y=0 m ≤ x ≤ 26 m and then y=1 m, x=0 m ≤ x ≤ 4 m.
The analysis of the calculation of resin requirements in the process of forming carbon fibre body using vacuum infusion method
Authors: Noor R A M , Hernandyansyah F
Published: May 2020

The aim of this research is to know the calculation of resin requirements which is used, the relative velocity of resin and filling time in body construction process of electric prototype vehicle which used carbon fibre material using vacuum infusion method. In making this vehicle body is using carbon fibre in order to have light in weight, strong and safe to fullfil the regulation or rule Shell Eco-Marathon (SEM).This light in weight vehicle is to increase power to weight ratio. So, it can be increase the efficiency of the fuel. The body of this vehicle has been included in Shell Eco-Marathon Asia which held in Singapore 2017. Based on the ideal calculation result resin in electric prototype that used carbon fibre using vacuum infusion method has obtained as much resin value as needed (RC) 3.83535 Kg, the relative velocity of resin (V) 0,005 m2/s, and filling time (t) for about 10,4 minutes and total weight body is 8 Kg.
Design of a new online monitoring system of COP based on Arduino Uno with application to split A/C
Authors: Erham E , Inten R N
Published: May 2020

Air Conditioner(A/C) is a system of air conditioning which serves need of thermal comfort inside a room. Until now, to determine COP of A/C is performed measurement of temperatures and pressures in A/C. Then, it is continued by calculating of COP. Unfortunately, the process take much time. Therefore, it is important to find any new method to obtain COP. In this paper, to solve the problem was designed a COP monitoring system. To do this, the Arduino Uno was uploaded a program of the monitoring system. The system was equipped sensors. And then to display COP was used a Laptop. The results showed that by using the proposed method and the traditional one, it was obtained that COP actual fluctuates about 3.3 in range from 3.14 to 3.51 and 3.2 to 3.5, respectively. In addition, it was predicted that the using of proposed method in illustrated situation can save time by 2 hours or 80%. It can be considered as a promising solution to determine the COP quickly and easily.
Web-based real time air properties display application
Authors: Badarudin A , Pratikto P , Falahuddin M A
Published: May 2020

A point on the psychrometric chart can show 7 properties of air. If two properties are known then 5 other properties can be calculated. Air treatment will change the properties of air conditions. Changes in air condition can be determined by measuring each air properties and plotted on a psychrometric chart. One of the uses of psychrometric analysis is to determine the amount of cooling capacity used in air conditioning systems. To show the condition of the air at any time needed a system that is integrated between the data acquisition device and data display. This research designs and develops applications that are ready to display data and psychrometric charts that can later be integrated with hardware equipped with sensors through an interface. Psychrometric applications are designed using the JavaScript programming language, so they can be opened using any web browser. Psychrometric charts are drawn using iteration calculation methods. Based on the results of data analysis, the difference in value between the results of manual calculations and applications is as follows: wet-bulb temperature (Twb) is 0.27%, Moisture Content (ω) is 0.77%, specific enthalpy (h) is 0.52 %, Specific Volume (v) is 0.28%, Dew-Point Temperature (Tdp) is 0.92%.
High strength lightweight concrete with expandable perlite as the aggregate
Authors: Pramusanto P , Nurrochman A , Mamby H E , Nugraha P
Published: May 2020

Lightweight concrete has been an interest due to its advantages compared to normal concrete. Lightweight concrete can be produced by the use of lightweight aggregates. In this study lightweight concretes were made with the composition of expandable perlite combined natural sand with each volume is 50% and concrete with 100% expandable perlite as the aggregates. The volume of the aggregates was varied from 80% up to 89%. The concretes were measured for their density and tested for the mechanical and absorption properties. As the results, expandable perlite obviously has the effect in reducing the concrete density. Nevertheless, the strength decrease as the expanded perlite aggregate increase. The optimum lightweight concrete that acceptable as the international standard is with the aggregates of expandable perlite combined natural sand having the 50% of each volume with the aggregates composition is 80%.
Groundwater study in Subang Industrial park and its recharge area as a suggestion for establishing recharge and discharge zones of Subang Groundwater Basin
Authors: Ashari Y , Pulungan L , Wijaksana I K , Isniarno N F , Mildan D
Published: May 2020

This research was conducted in Subang Groundwater Basin, West-Java, related to the prohibition of groundwater extraction in the Subang Industrial Park (SIP) area. This is because the area is considered as the Recharge Zone of the groundwater basin. The purpose of this study is to determine whether SIP stands above the Recharge Zone or not, moreover, find out which part of the Basin that supplies groundwater aquifers of SIP. The method used in this study is applied of DRASTIC method using ArcGIS and conducting field research measuring the infiltration rate of soil formations at selected points in the Basin, geologic and hydrogeological mapping of Lakes. The results of this study indicate that the SIP is indeed built on a recharge area, the soil where the SIP is established, has ability to infiltrate rainwater. However, the results of more detailed observations of wellbore logs in this area, it is known that between the groundwater aquifer used in SIP and the infiltration zone of the ground surface is separated by impermeable clay layers. This ensures that there is no relationship between surface water infiltration and groundwater being extracted by factories in the areas. Therefore, it is certain that the recharge area originates from other areas in the Basin. Key words: aquifer, recharge area, Subang Groundwater Basin.
Gold water treatment, waste monitoring, and management with the fitoremediation method
Authors: Pulungan L , Zaenal Z , Ashari Y , Megantara F
Published: May 2020

Gold processing activities along the Ciherang river use Mercury. Monitoring and managing the impact of gold processing activities on the environment by the standard quality of wastewater quality of the Ministry of Environment No.202 Th.2004 concerning Wastewater Quality Standards for Gold and or Copper Ore Processing Activities. Monitoring the quality of wastewater flowing into the river by observing water pH, TDS, and mercury content. Environmental management is carried out by reducing the mercury metal content in wastewater, with the phytoremediation method using Eichhornia Crassipes. Monitoring is carried out at five different locations, wastewater out of gold processing, 2 locations at the settling pond, and 2 locations at the river water. The results showed an increase in mercury content in settling pond 2, 0.525 mg / L, and settling pond 3, 0.00903 mg / L. The environmental management with the Fitoremediation method day 0 Hg levels of 0.06284 mg / L, day 4 Hg levels produced to 0.01203 mg / L, day eight the value of Hg levels 0.114 mg / L, the 12th day the value of the resulting Hg 0.01267 mg / L
Increasing the performance of silica modified quaternary triammine for sorption of Gold(III) Ion
Authors: Ngatijo N , Gusti D R , Bemis R , Fadhilah A H
Published: May 2020

Synthesis Silica Modified Quaternary Ammines (SMQA) and its application has been carried out on the adsorption of gold(III) ions in a batch system. SMQA material is synthesized through the SMA methylation reaction. SMA material is synthesized from Na2SiO3 and 3-Aminopropyltrimethoxysilane (3-APTMS). Furthermore, the replacement of the methyl group in [-N(CH3)3]+ will change to [-N+CH3{(CH2)3N+(CH3)3}2] called Silica Modified Quaternary Triammines (SMQT). SMQT is synthesized by watching SMA with 3-APTMS become SMT which is then refluxed for methylation process to form SMQT. Material characterization is carried out through identification of functional groups, surface morphological analysis, elemental composition and metal ion concentration. Adsorption process of metal anion [AuCl4]- obtained optimum results at pH 5 with a contact time of 100 minutes with an adsorption capacity of 77.58 mg/g and an efficiency value of 96.975%.
Development of Internet of Things (IoT) based learning media in efforts to improve student skills at the industrial revolution era 4.0
Authors: Kustija J , Hakim D L , Hasbullah H
Published: May 2020

Practicum is an essential component in the learning process at universities, especially in the fields of science and technology. Realizing quality practicum requires a balanced amount of equipment that supports the process, but practicum participants often exceed practicum equipment. The solution is to create a remote laboratory that can be accessed from anywhere while connected to the internet. The remote laboratory consists of three essential parts, namely a server that includes a computer or laptop connected to the data processor sent by the user and then connected to the actuator, a server is also connected to the camera that the user can observe the practical work. The second part is an internet connection, and the third part is the user. All that is controlled by ThinVNC software, Ngrok, and GUI that has been provided. On the server computer, GUI, ThinVNC, and Ngrok are installed as controllers for the practical work, while the user can open the website to access the lab computer. Based on theory and experience, this technique is very suitable if used in PLC and pneumatic practicum. The use of remote labs makes students more skilled in facing the era of the industrial revolution 4.0.