IPTEK Journal of Proceedings Series
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The Risk Assessment of Genset Installation Project Using Fault Tree Analysis In Indonesia
Get PDFThe XYZ company had a project to install the generator set (genset) in several island in Indonesia. The project was estimated to finish in 10 months, but it delayed up to 20 months. This delayment made the company experience cost overruns. In the other hand, according to Indonesian Ministry of Energy and Mineral Resource (MSDM) in 2016, the electrification in this project area has not reached 100%. The area are including Kalimantan, West Nusa Tenggara (WTB), Papua, Sulawesi and Maluku. The tardiness was caused by the company can't mitigate the project risk optimally. Therefore this research aims to evaluate this genset installation project to assess the risk, thus in the next project the company can avoid project delay and the overruns cost. The research uses Fault Tree Analysis (FTA) in risk assessment to identify the basic event of the project’s problem. First, this research collect the report of the project. Second, this project collect the problems that caused project delay. There are 154 problems found in this research. The FTA method divides the problems found into 13 basic event. The highest risk that triggers problem for this project are from two basic events, which are user error with the probability rate 0,2013 and installation error with the probability rate 0,1494
Design and Modelling of Ballscrew Linear Guide Actuator for Earthquake Shaking Table (EST) Based on Neural Network
Get PDFEarthquake Shaking Table (EST) is a device which can simulate an earthquake motion. This device is used to test the strength of a building structure against an earthquake motions before it’s actually made. EST uses a variety of actuators one of them is ball-screw linear guide actuator. The EST used in this project is a bi-axial type which uses 2 linear actuators to simulate the x-axis and y-axis movement of earthquake, each of them used bipolar stepper motor as the main rotary-actuating device. This project models the linear guide actuator using backpropagation neural-network algorithm. The model is built with empirical method using datas taken from the real behavior of both linear actuators. The datas include acceleration, displacement, and velocity of both actuators and they are used to train the neural network using backpropagation with Levenberg-Marquadt method. Simulation is done using Simulink and the results show that model is able to produces nearly same exact movement with the real hardware with error approximately 0,214 % and 0,685% respectively for both actuators
Analysis on Quality of Service at Design and Engineering Department by Using Servqual, IPA, and QFD Methods
Get PDFPT. Semen Indonesia develops the cement business in Indonesia by striving to be at the forefront in the world of the cement manufacturing business, as well as trying to be a calculated player in the cement derivative business. To achieve this goal, the Department of Design & Engineering, as a supporting function, always strives to provide the best service for customers, namely other work units within PT. Semen Indonesia group. There are 20 service attributes used as indicators in the questionnaire, covering five dimensions of service quality, namely tangible, empathy, responsiveness, reliability, and assurance. The measurement of the level of customer satisfaction of the Design & Engineering Department is carried out by Service Quality (Servqual), Importance Performance Analysis (IPA), Quality Function Deployment (QFD) methods. The results show that based on Servqual analysis, in general, customers are still not satisfied with the resulting performance. Based on the results of the IPA analysis, five service attributes are the top priority for improvement, namely: coordination with customers, completion of Engineering work according to the agreed time, solutions to customer problems, able to meet customer needs, and product engineering by customer desires. Based on the results of the QFD analysis, there are six strategic steps in the work program carried out to improve service quality in the Design & Engineering Department
Integrated Modelling of In-Bag Fertilizer Handling Process and Forklift Needs to Reduce Waste in Sales Warehouses of PT Petrokimia Gresik
Get PDFPT. Petrokimia Gresik is one of the most outstanding fertilizer manufacturers with 5 sales warehouses. The Company organizes its distribution system to ensure adequate distribution to the right target. To plan the process of handling in-bag fertilizer, resources such as contract workers, forklifts, and trucks are needed. However, there are numerous wastes associated with the handling process, which is shown by forklift idle time due to the bagging, handling, and loading processes. Therefore, this research identifies the waste that occurs using the Value Stream Mapping (VSM) method with the 5 why’s tool. This research also uses simulation to analyze and validate the recommendations. Data obtained through questionnaires showed that waste occurs due to waiting time by 28.2% and unnecessary motion by 22.7%. The described Process Activity Mapping (PAM) tools show that fertilizer delivery has cycle times of 9030 seconds, with value-added activities of 66%. The analysis of 5 why’s tools shows that the low handling speed causes waste at the bagging and loading processes and the unnecessary motion of forklift-3. The recommendations according to the future state Value Stream Mapping (VSM) are adding the contract worker in the bagging process, removing forklift-3, and adding the contract worker in the loading process. Therefore, the value-added activity increases to 75.8% and accelerates the delivery cycle time to 7733 seconds. The validation results using the simulation shows that forklift-3 can be eliminated because it has a low utilization value of 16.4%, merging the activity of sewing services of 3% with a decrease in transfer time from 7.9 hours to 2.9 hours for one delivery cycle. In conclusion, the removal of all forklift-3 in 5 sales warehouse results shows that the company can save rental costs by Rp.4,772,376,000/year
Nurse Scheduling Optimation with Various Assignment Pattern at ABC Hospital Using Goal Programming Method
Get PDFIn fulfilling health services in hospitals, the availability of human resources (HR) which includes doctors, nurses, midwives, and so on, plays a very important role. In terms of amount and dominant existence in the hospital in providing health services to patients is a nurse. The role of hospital management in maintaining the availability of nurses is to plan a good schedule. Without a good resource scheduling plan, the services will not be optimal and the costs will hard to control. This research aims to optimize the nurse scheduling. Existing schedule did not pay attention to specific time that have different load to another. Management feels that a lot of idle time is experienced by some nurses. Therefore, from the data that occurred in the past there will be observations that every 4 hours will occur how many services performed and how many nurses needed. Furthermore, by using Goal Programming method, several priority objectives are made, such as how to minimize the deviation of nurses needed in one shift or slot. Then how to minimize the excess target number of nurses who work in one week. And then minimize the excess number of nurses who work on the night shift. The suggested mathematical model has been implemented using Lingo Software. Work patterns have been suggested to improve schedules quality based on different load of services that occur in specific time. The suggested approach can be used for any similar staff scheduling problem in the next research
Perception of Visual Impairment Towards the Aesthetic of Architectural Elements
Get PDFPhenomenology in architecture is associated with perception between the subject and the space, which one of the studies includes multisensory experience. In general, contemporary architecture accentuates the visual experience, among other sensory modalities. Therefore, it is necessary to conduct research about the exploration of multisensory perception in architectural design. This study aims to explore how sensory activities or blind and visual impaired experience the spatial and the elements of architecture. This study is started by examining a brief literature review and then conducts qualitative research (in-depth interview and participant observation) to explore sensory experience and perception of blind people. The result finds from the five elements, walls and windows are the most influential elements for blind people. The existence of a wall has the potential to be a wayfinding of haptic system and has an echo effect. While the aperture opening element influences the illumination of light as well as indicators of outside space limits. The research outcome shows that people with visual impairment also acknowledge and they recognize these principles of design. They recognize contrast of temperature through the opening element, rhythm of texture through the wall, surface balance through the furniture, and hierarchy of noise through the window
Implementation of KPKU (Kriteria Performa Kinerja Unggul) Method to Increase The Company Performance at PT. XYZ
Get PDFGas and steam power plant (PLTGU) is a power plant that can operate very quickly from start-up to generate electric power as quick as fifteen minutes compared with steam power plant which takes eight hours. PLTGU can use gas fuel, HSD (High Speed Diesel), MFO (Marine Fuel Oil) as the operating fuel and so that can be said generating reliable and flexible because it can operate in two modes of cycle, open cycle and combine cycle. Power Plant performance sometimes does not match with what we expected, we need a strategy in order to achieve optimal performance. The problem is the generation performance decrease from its optimal condition due to the plant aging, operation and governance pattern. Power Plant XYZ has not achieved the expected performance from 2015 to 2018 which still below 95% averages out of expected target 95% to 100%. In order to improve the performance this research is used KPKU (Kriteria Performa Kinerja Unggul) methods which adopted from the Malcolm Baldrige Criteria for Performance Excellent (MBCFPE). The purpose of this study is to boost the company's competitive advantage, improve performance on an ongoing basis, and to achieve the vision and mission and objectives of the company
Assesing the Financial Performance: in Perspective Environmental Performance, CSR, GCG, and Leverage
Get PDFThe company has a goal to generate maximum profit. However, the dry season in 2019 used by them to carried out "land clearing" of the forest to make profits in a bad way. This is conseptual research and qualitative research that aims to analyze the influence between variables. This research analyzes the effect of Environmental Performance, Corporate Social Responsibility (CSR), Good Corporate Governance (GCG) as a non-financial aspect and Leverage as financial aspect on Financial Performance. This research is designed by qualitative research with theoretical reviews as the main method. The authors conducted a systematic review of the articles that were identified from international and national business journals published between 2014 and 2019. There is three basic theory about agency theory, stakeholder theory, and trade-off theory as the foundation for reviewing some previous research. By the classifying the result found some propositions: 1) The good of environmental performance affect positive financial performance, 2) The higher disclosure of Corporate Social Responsibility affects the financial performance to be good, 3) The good implementation of Good Corporate Governance can make the financial performance to be good and, 4) The good ratio of Leverage will affect positively the financial performanc
IRR Incremental Analysis of Fuel Facility Construction Projects - Juanda Airport Terminal 2
Get PDFIndonesia is the largest archipelago country in the world so that Indonesia's need for air transportation cannot be avoided. The demand for air transportation services increases in line with the increase in population and the level of welfare of the people. At Juanda Airport until the end of 2013 the number of passengers exceeds the capacity of the existing terminal. Overcoming this problem, PT Angkasa Pura I developed Terminal 2 of Juanda Airport, which began operating on 14 February 2014. With the development of facilities and flight facilities for Juanda Airport, aviation fuel supply needs have also increased. PT Pertamina (Persero) through the Aviation business unit as a provider of jet fuel at Juanda Airport, supports the development of the airport facilities. The investment carried out in 2017-2020 are the installation of a hydrant system pipeline for Terminal 2 and the addition of a storage tank to increase coverage days in the Depot Pengisian Pesawat Udara (DPPU) Juanda planned to begin in 2020. Until December 2019 the hydrant system project progress has reached 96%, but there has been a decline flight frequency since December 2018 due to partial closure of routes by airlines, reduction in flight frequencies and a decrease in jet fuel prices at market demand, so it is necessary to decide whether or not to continue investing in tank construction. Therefore, capital budgeting analysis is carried out using the incremental Internal Rate of Return (IRR) method between hydrant project investments and tank construction compared to hydrant projects without tank construction. The results of the incremental IRR analysis showed an IRR of 9.81% while the MARR used was 10.38%
Influence of Façade Configuration on Thermal Performance of Residential Unit of Typical Walk-up Flats in Surabaya
Get PDFFlat design has evolved and taken many shapes and forms. Most of the arrangements are arranged in a double-load layout where the units are positioned face to face along the corridor. Another type is two single-loaded flats that are configured to face the courtyard. Building façade also varies from those with shaded surfaces to those with minimum sun protection. Modification in design clearly has an impact on the thermal performance of the buildings. The aim of the study is to investigate the facade configuration on the thermal performance of the building. This study uses simulation software, namely, Design Builder, to predict the thermal performance of the buildings. Several variants of window areas, sun shading, balconies are arranged to explore their effects on thermal performance. Flat with yard selected as a reference model. The results showed that the smaller the window area and the greater coverage given to the window with a shading device, combined with the balcony, can provide a decrease in air temperature up to 0.57 ⁰C, with a reduction in cooling degree hours percentage of 36.97% comparing to the reference model