Pub Date : 2021-10-19DOI: 10.12962/j23546026.y2020i3.11194
Luthfi Yulian Fikri, S. Suparno
{"title":"Implementation of Risk Management for Coal Switching in Coal Fired Steam Power Plant","authors":"Luthfi Yulian Fikri, S. Suparno","doi":"10.12962/j23546026.y2020i3.11194","DOIUrl":"https://doi.org/10.12962/j23546026.y2020i3.11194","url":null,"abstract":"","PeriodicalId":14533,"journal":{"name":"IPTEK Journal of Proceedings Series","volume":"25 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79484140","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-10-19DOI: 10.12962/j23546026.y2020i3.11217
M. Fadhil, E. Suryani
― XYZ Mart is a convenience store in Tulungagung regency. Founded in 2012, this store is designed to serve the daily needs of surrounding residents. In addition, this store also caters for the needs of families visiting patients at the hospital in front of XYZ Mart. Along with the store growth, there are more and more customers, and so the more demand. To handle the increasing demand, the store has to increase its inventory of goods. Problems arise when the number of goods keep increasing while the store inventory space does not. Therefore, in order to avoid overstocking or understocking, a research and planning are conducted to determine the optimal number of an order. The method used for inventory optimization is Economic Order Quantity (EOQ) to calculate the most optimal number of goods ordered. To anticipate the uncertainty of demand, Safety Stock (SS) is also used. To determine the average demand per year based on historical data, as a basis for EOQ and SS calculations, a Monte Carlo simulation is used. The expected outcome of this research is to provide recommendations of when and how much goods must be ordered so that the store can optimally use its limited space of inventory.
{"title":"Inventory Planning for XYZ Mart using EOQ and Monte Carlo","authors":"M. Fadhil, E. Suryani","doi":"10.12962/j23546026.y2020i3.11217","DOIUrl":"https://doi.org/10.12962/j23546026.y2020i3.11217","url":null,"abstract":"― XYZ Mart is a convenience store in Tulungagung regency. Founded in 2012, this store is designed to serve the daily needs of surrounding residents. In addition, this store also caters for the needs of families visiting patients at the hospital in front of XYZ Mart. Along with the store growth, there are more and more customers, and so the more demand. To handle the increasing demand, the store has to increase its inventory of goods. Problems arise when the number of goods keep increasing while the store inventory space does not. Therefore, in order to avoid overstocking or understocking, a research and planning are conducted to determine the optimal number of an order. The method used for inventory optimization is Economic Order Quantity (EOQ) to calculate the most optimal number of goods ordered. To anticipate the uncertainty of demand, Safety Stock (SS) is also used. To determine the average demand per year based on historical data, as a basis for EOQ and SS calculations, a Monte Carlo simulation is used. The expected outcome of this research is to provide recommendations of when and how much goods must be ordered so that the store can optimally use its limited space of inventory.","PeriodicalId":14533,"journal":{"name":"IPTEK Journal of Proceedings Series","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78271853","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-10-19DOI: 10.12962/j23546026.y2020i3.11218
Hana Fathia Izazi, B. Noer
{"title":"Prioritization of Urea Fertilizer 4Ps Marketing Mix: A Case Study","authors":"Hana Fathia Izazi, B. Noer","doi":"10.12962/j23546026.y2020i3.11218","DOIUrl":"https://doi.org/10.12962/j23546026.y2020i3.11218","url":null,"abstract":"","PeriodicalId":14533,"journal":{"name":"IPTEK Journal of Proceedings Series","volume":"180 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83418075","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-10-19DOI: 10.12962/j23546026.y2020i3.11209
Bassam Muhammad Drehem, I. Vanany
{"title":"Strategic Analysis on Start-Up Business Using Objectives and Key Results Method in Rumah Kapas Holding","authors":"Bassam Muhammad Drehem, I. Vanany","doi":"10.12962/j23546026.y2020i3.11209","DOIUrl":"https://doi.org/10.12962/j23546026.y2020i3.11209","url":null,"abstract":"","PeriodicalId":14533,"journal":{"name":"IPTEK Journal of Proceedings Series","volume":"105 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75690301","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-10-19DOI: 10.12962/j23546026.y2020i3.11207
M. Pangestu, C. Utomo, E. Ahyudanari
― This study intends to determine the sensitivity of changes in oil prices to investment in power supply projects from the financial aspect. The investment analysis conducted is an evaluation of Net Present Value (NPV) using the production sharing contract (PSC) model with a profit sharing system. Based on the analysis conducted, the sensitivity of changes in oil prices has a very significant effect on the project NPV. Changes in oil prices by 60% from the base case to US $ 80 caused NPV to rise by 183%. But on the contrary if the price of oil touches the figure of US $ 20 or -60% from the base case, it will make the NPV negative, so the project is not economical to proceed. In addition, it know that the acceptance limit of investment in power supply projects is at oil prices greater than US $ 34 per barrel. This significant change in both the decline and increase in oil prices to the NPV is very logical because oil prices determine the amount of revenue earned from this project.
{"title":"Oil Prices Sensitivity to The Power Supply Procurement Project at PT PEP Sukowati","authors":"M. Pangestu, C. Utomo, E. Ahyudanari","doi":"10.12962/j23546026.y2020i3.11207","DOIUrl":"https://doi.org/10.12962/j23546026.y2020i3.11207","url":null,"abstract":"― This study intends to determine the sensitivity of changes in oil prices to investment in power supply projects from the financial aspect. The investment analysis conducted is an evaluation of Net Present Value (NPV) using the production sharing contract (PSC) model with a profit sharing system. Based on the analysis conducted, the sensitivity of changes in oil prices has a very significant effect on the project NPV. Changes in oil prices by 60% from the base case to US $ 80 caused NPV to rise by 183%. But on the contrary if the price of oil touches the figure of US $ 20 or -60% from the base case, it will make the NPV negative, so the project is not economical to proceed. In addition, it know that the acceptance limit of investment in power supply projects is at oil prices greater than US $ 34 per barrel. This significant change in both the decline and increase in oil prices to the NPV is very logical because oil prices determine the amount of revenue earned from this project.","PeriodicalId":14533,"journal":{"name":"IPTEK Journal of Proceedings Series","volume":"85 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83913842","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-10-16DOI: 10.12962/j23546026.y2020i3.11165
M. Fauzan, B. Syairudin
{"title":"Modeling Priority Maintenance Cost Based on Top-Down and Bottom-Up Approach with Reconciliation of Forum Group Discussion","authors":"M. Fauzan, B. Syairudin","doi":"10.12962/j23546026.y2020i3.11165","DOIUrl":"https://doi.org/10.12962/j23546026.y2020i3.11165","url":null,"abstract":"","PeriodicalId":14533,"journal":{"name":"IPTEK Journal of Proceedings Series","volume":"64 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72554467","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-10-16DOI: 10.12962/j23546026.y2020i6.11099
Yasmine Mawaddag Ghufrona, A. Dinapradipta, F. Samodra
Abstrak —Utilization of abundant sunlight in tropical climates as daylighting can help to save energy consumption in the flats building. Based on daylight conditions in tropics, there is a need for a dynamic shading to be applied in façade which can be transformed to respond to the environmental change. Folding shutter is a dynamic shading device which can be operated by using folding and rotation motion. This paper aims to discuss the impact of folding shutter on the daylight performance in the context of flats buildings in tropical climates. Simulation using Radiance was conducted to test the sub-variables of folding shutter, including the folding configurations and shutter’s rotation angles on different conditions in tropics. The results showed that folding configurations results in high increase of daylight intensity and should be applied moderately. Meanwhile the shutter’s slats can help to diffuse and reflecting incoming light to the deepest areas of room. A closed configuration with shutter’s angle of 0° and 45° performed the best to face the inconsistent cloud movement in partly cloudy sky. The integration of folding shutter and 60 cm overhang produced the most stable performance which can meet the visual comfort standard in the longest period in tropics.
{"title":"The Impact of Folding Shutter on the Daylighting Performance in Tropical Climate","authors":"Yasmine Mawaddag Ghufrona, A. Dinapradipta, F. Samodra","doi":"10.12962/j23546026.y2020i6.11099","DOIUrl":"https://doi.org/10.12962/j23546026.y2020i6.11099","url":null,"abstract":"Abstrak —Utilization of abundant sunlight in tropical climates as daylighting can help to save energy consumption in the flats building. Based on daylight conditions in tropics, there is a need for a dynamic shading to be applied in façade which can be transformed to respond to the environmental change. Folding shutter is a dynamic shading device which can be operated by using folding and rotation motion. This paper aims to discuss the impact of folding shutter on the daylight performance in the context of flats buildings in tropical climates. Simulation using Radiance was conducted to test the sub-variables of folding shutter, including the folding configurations and shutter’s rotation angles on different conditions in tropics. The results showed that folding configurations results in high increase of daylight intensity and should be applied moderately. Meanwhile the shutter’s slats can help to diffuse and reflecting incoming light to the deepest areas of room. A closed configuration with shutter’s angle of 0° and 45° performed the best to face the inconsistent cloud movement in partly cloudy sky. The integration of folding shutter and 60 cm overhang produced the most stable performance which can meet the visual comfort standard in the longest period in tropics.","PeriodicalId":14533,"journal":{"name":"IPTEK Journal of Proceedings Series","volume":"50 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78996755","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-10-15DOI: 10.12962/j23546026.y2020i6.11092
Huda Dawam Indana, A. Dinapradipta, Fransiskus Xaverius Teddy Badai Samodra
Abstrak —Modeling and simulation using computer software are very important in supporting various types of research based on data calculations. In the research process, accuracy is needed between the simulation results and the results of field measurements. Thus, there is no significant difference between the two results. This study aims to verify and validate the result of field measurements and simulation using the ARCHIPAK 5.1 software. The variables studied focus on indoor air temperature and humidity. This research takes a case study in the village of Ranupane which is located within the Bromo Tengger Semeru National Park. There are 4 housing buildings measured which consist of two types of houses using fireplaces and two types of houses without fireplaces. All of the four houses are afterward modeled using the ARCHIPAK 5.1 software to validate the data results. From the measurement results, the field measurement data show a higher hourly temperature profile compared to the results of the simulation of the base case model. Two striking differences are the type of house without a fireplace which is showing the difference in the average temperature of 1-2 K. While the type of house using fireplace shows the difference average temperature of 5,2-5,3 K. This occurs due to the internal heat gain input which the value is a slight difference between the result of field measurements and simulation of the base case model. This data verification and validation will be used as modeling optimal building configuration for housing in a humid tropical highland climate.
{"title":"Simulation Validation for Thermal Performance of Building Envelope Material in Humid Tropical Higland Climate","authors":"Huda Dawam Indana, A. Dinapradipta, Fransiskus Xaverius Teddy Badai Samodra","doi":"10.12962/j23546026.y2020i6.11092","DOIUrl":"https://doi.org/10.12962/j23546026.y2020i6.11092","url":null,"abstract":"Abstrak —Modeling and simulation using computer software are very important in supporting various types of research based on data calculations. In the research process, accuracy is needed between the simulation results and the results of field measurements. Thus, there is no significant difference between the two results. This study aims to verify and validate the result of field measurements and simulation using the ARCHIPAK 5.1 software. The variables studied focus on indoor air temperature and humidity. This research takes a case study in the village of Ranupane which is located within the Bromo Tengger Semeru National Park. There are 4 housing buildings measured which consist of two types of houses using fireplaces and two types of houses without fireplaces. All of the four houses are afterward modeled using the ARCHIPAK 5.1 software to validate the data results. From the measurement results, the field measurement data show a higher hourly temperature profile compared to the results of the simulation of the base case model. Two striking differences are the type of house without a fireplace which is showing the difference in the average temperature of 1-2 K. While the type of house using fireplace shows the difference average temperature of 5,2-5,3 K. This occurs due to the internal heat gain input which the value is a slight difference between the result of field measurements and simulation of the base case model. This data verification and validation will be used as modeling optimal building configuration for housing in a humid tropical highland climate.","PeriodicalId":14533,"journal":{"name":"IPTEK Journal of Proceedings Series","volume":"14 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78730348","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-10-15DOI: 10.12962/j23546026.y2020i6.11148
B. L. Widjiantoro, Syahrul Munir, K. Indriawati
― Since the 19th century, the use of electric motors continues to grow. Nowadays electric motors have been widely used in various fields of industry. One type of electric motor that is often used is an induction motor. Induction motors work in the presence of induced currents due to the relative difference in rotor rotation with rotating magnetic fields. Induction motors are preferred for industrial purposes because of low cost, easy to maintain, and high efficiency. Induction motors that are used continuously can experience several types of fault. The existence of fault can affect the performance of the induction motor. One of the fault that often occurs in induction motor is the result of stator inter-turn fault. This fault is caused by the gradual deterioration of insulation in the stator winding which cause a short-circuit. Sooner or later, this fault can cause damage to the induction motor in a short time if left unchecked. So, it is very important to monitor the fault in real-time. Therefore, this research proposes a fault estimation method on induction motor. The design of fault estimation based on particle filtering and extended state space equations is used to estimate the stator inter-turn fault. The effectiveness of this approach is validated by use of a computer simulation with using two fault signal represented by 𝛈 𝐜𝐜 ramp and step signal. The performances of this fault estimation are measured by RMSE and with using 500 particles has smallest RMSE value, which are 0.0112 and 0.0124 for dq current fault when using 𝛈 𝐜𝐜 ramp signal and 0.2373 and 0.2367 for dq current fault when using 𝛈 𝐜𝐜 step signal.
{"title":"Fault Estimation on Induction Motor Based on Stator Inter-Turn Fault","authors":"B. L. Widjiantoro, Syahrul Munir, K. Indriawati","doi":"10.12962/j23546026.y2020i6.11148","DOIUrl":"https://doi.org/10.12962/j23546026.y2020i6.11148","url":null,"abstract":"― Since the 19th century, the use of electric motors continues to grow. Nowadays electric motors have been widely used in various fields of industry. One type of electric motor that is often used is an induction motor. Induction motors work in the presence of induced currents due to the relative difference in rotor rotation with rotating magnetic fields. Induction motors are preferred for industrial purposes because of low cost, easy to maintain, and high efficiency. Induction motors that are used continuously can experience several types of fault. The existence of fault can affect the performance of the induction motor. One of the fault that often occurs in induction motor is the result of stator inter-turn fault. This fault is caused by the gradual deterioration of insulation in the stator winding which cause a short-circuit. Sooner or later, this fault can cause damage to the induction motor in a short time if left unchecked. So, it is very important to monitor the fault in real-time. Therefore, this research proposes a fault estimation method on induction motor. The design of fault estimation based on particle filtering and extended state space equations is used to estimate the stator inter-turn fault. The effectiveness of this approach is validated by use of a computer simulation with using two fault signal represented by 𝛈 𝐜𝐜 ramp and step signal. The performances of this fault estimation are measured by RMSE and with using 500 particles has smallest RMSE value, which are 0.0112 and 0.0124 for dq current fault when using 𝛈 𝐜𝐜 ramp signal and 0.2373 and 0.2367 for dq current fault when using 𝛈 𝐜𝐜 step signal.","PeriodicalId":14533,"journal":{"name":"IPTEK Journal of Proceedings Series","volume":"114 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77740225","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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