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Wahyu Wibowo
Program Studi S1 Teknik Perkapalan Fakultas Teknik Universitas Diponegoro
Religion Aerospace Engineering Agriculture, Biological Sciences & Forestry Arts Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Engineering Environmental Science Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Library & Information Science Mathematics Mechanical Engineering Public Health Social Sciences Transportation Other

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Journal : Indonesian Journal of Multidisciplinary Science

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Optimal points of operational parameters of sulphuric acid, phosphic acid, and ammonia production process Jati, Gahara Mahadyatmika; Wibowo, Wahyu
Indonesian Journal of Multidisciplinary Science Vol. 3 No. 1 (2023): Indonesian Journal of Multidisciplinary Science
Publisher : International Journal Labs

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55324/ijoms.v3i1.672

Abstract

PT Petrokimia Gresik is the most complete fertilizer producer in Indonesia and produces various types of fertilizers. NPK is a fertilizer that contains nitrogen (N) to make plants greener, phosphorus (P) to stimulate root growth, and potassium (K) to make plants more upright and sturdy. This study aims to determine the optimum value of using sulfuric acid, phosphoric acid, and ammonia so as to obtain the best value in producing NPK fertilizer. This research method uses quantitative descriptive research methods by collecting secondary data, namely the use of sulfuric acid, phosphoric acid, and ammonia for a period of 1 year. Researchers use multiple regression analysis to determine whether or not there is an influence between the three variables to be studied, then the data is processed and analyzed to determine whether the regression model used is feasible to use before finally calculating the optimal point of NPK fertilizer production. The stages of data optimization in this study are the data collection stage, the data processing stage (descriptive data, parameter estimation, regression model), the data analysis and interpretation stage (F test, t test, IIDN assumption test for determining the optimum point), and the conclusion and suggestion stage. This study concluded that obtaining the optimum point for the amount of NPK fertilizer production can be done by regulating the use of phosphoric acid at 211.91 tons, Sulphuric acid at 844,099 tons, and ammonia at 308,055 tons. Total fertilizer production achieved with the use of optimum parameters amounted to 2085.38 tons.
Forecast sales volume of aviation fuel in Jakarta using ARIMA Method to support inventory control Setiyawan, Ary Putra; Wibowo, Wahyu; Atok, R. Mohamad
Indonesian Journal of Multidisciplinary Science Vol. 3 No. 4 (2024): Indonesian Journal of Multidisciplinary Science
Publisher : International Journal Labs

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55324/ijoms.v3i4.804

Abstract

The civil aviation industry in Indonesia experienced a significant increase from 2009-2018. The increase occurred in passenger and cargo activities. However, the situation changed drastically when the Covid-19 pandemic occurred throughout the world in 2019. PT xyz as a company need to adapt and optimize the business process. Inventory management is something that can be optimized. The aim of this research was to forecast aviation fuel demand in Jakarta and utilize the forecast result as a basis for inventory management. This research utilizes time series data on aviation fuel sales to determine demand estimates for the following month. The method used to forecast is the Autoregressive Integrated Moving Average. Furthermore, the forecast data is combined with information on storage capacity and historical data on product supply arrivals as input data in calculating safety stock to obtain more economical inventory management. The result of this research is that the best forecast avtur demand in Jakarta is using Arima (1,1,1). Safety inventory calculation based on demand forecasting with 90% cycle service level for Jakarta is 42,495 kiloLiter and PT xyz still can reduce products in their storage worth IDR. 341.8 M in Jakarta to maintain the same cycle service level.
Co-Authors Afriani, Sukma Afridah, Nur Agusinta, Lira Ahmad Choiri Ahmad Fauzan Ahmad Roziqin, Ahmad Alfiyana, Eva Aminuddin Aminuddin Aminuddin Amita Andriyani Widiyastuti Arifa, Isna Ariga, Adi aritaningrum, mahmudah Asbi, M. Atok, R. Mohamad Ayu Prabawani, Nimas Bagas Noval ramadhani Basri, Hanisa Dewi Ratih, Iis Dinanti, Lucia Ari Dwi Harini Edhie Budi Setiawan, Edhie Budi El Haqq, Byrlianty Tsabita emilda, puri Erna Sofriana Imaningsih Eva alfiyana Fatiha, Nur Fatmah, Nurul febrianti, anita Fitri, Tharisa Desiana Hadromi - Hikmah Endraswati, Hikmah Ikhsan, Ridho Bramulya Ilmansyah, Muh. Noorridho Ilmansyah, Muhammad Noorridho Imam Yuwono Irwan Chairuddin Ishak Kasim Jati, Gahara Mahadyatmika Jauhar Arifin, Jauhar Joko Setyono Jurnal Wicara Kasjana, Kasjana Kurnia Rachmawati, Kurnia kurniawan, gangsar Lestari, Nabila Setio Liem Ek Bien Liem Ek Bien Listyputri, Alyssa Zahra Lucia Aridinanti Mangatur, Yonathan Maulida, Khairani Maulida, Sofia Moh Badrul Qomar MUHAMMAD SYAIFULLOH Muhammad Wakhid Musthofa Mumpuni Retnaningsih, Sri mushafir, mushawir Ningrum, Selli Lestari Nofriansyah Nugraha, Fery Nur Rahmi Irfaniah Nurkhalizah Nurmawanti, Iva Palimbunga, Aris Study Panggabean, Nur Azizah paramitralaksmi, ratri Permatasari, Tri Pingit Wulandari, Sri Pradipta, Apsarini Purnama DW, Akbar Nuur Putri, Eka Deviana Putri, Nur Sinta Dewi Ramelan Ramelan Rasuma, Nonik Ratih, Iis Dewi Riono, Slamet Bambang Salim, Fuad Samami, Shahib Satibi, Ibi Selli Lestari Ningrum, Selli Setiyawan, Ary Putra Silalahi, Siska A. Siska Amonalisa Silalahi Siti Fatimah Solly Aryza Sri Mumpuni Retnaningsih Sri Pingit Wulandari Syamsul Arifin triana, fina Waslam Waslam, Waslam Wildani, Zakiatul Wulandari, Ratna Maulidah Yanuar, Maria Ulfa Yuwanti, Destiyana