Article Per Year (5 Year)
p-Index From 2020 - 2025
0.817
P-Index
This Author published in this journals
All Journal Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa Dan Inovasi Automotive Experiences Proceeding Mercu Buana Conference on Industrial Engineering Jurnal Pengabdian Masyarakat Charitas
Gunawan, Sebastian
Unknown Affiliation
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Social Sciences

Published : 4 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 4 Documents
Search

 1 
Combustion Analysis of Ammonia/Gasoline Mixtures at Various Injection Timing Conditions in a High Compression Ratio SI Engine with Sub-Chamber Ichiyanagi, Mitsuhisa; Yilmaz, Emir; Suzuki, Takashi; Okada, Takanobu; Yamamoto, Hikaru; Kodaka, Masashi; Shiraishi, Hikaru; Mukae, Shinnosuke; Tamba, Ryota; Widjaja, Henry; Jonathan, Leon; Gunawan, Sebastian; Gotama, Gabriel Jeremy; Anggono, Willyanto
Automotive Experiences Vol 7 No 2 (2024)
Publisher : Automotive Laboratory of Universitas Muhammadiyah Magelang in collaboration with Association of Indonesian Vocational Educators (AIVE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/ae.10533

Abstract

Due to the problem of carbon dioxide (CO2) emissions, alternative fuels such as ammonia (NH3) have garnered a lot of attention lately. This is due to its carbon-free molecular structure, ease of transport, and high energy density. Unfortunately, ammonia is not without flaws since it is considered a difficult fuel to burn in conventional internal combustion engines. To further investigate the burning characteristics of ammonia, this study is conducted for ammonia/gasoline co-combustion using a modified engine equipped with a sub-chamber. The engine ran at 1000 RPM and had a 17.7 compression ratio with two injection timings of -55 and 10 crank angle degrees (°CA) after the top dead center (ATDC), while the ammonia energy ratios were adjusted across a range from 40% to 70%. The results show that the earlier injection timing allowed better premixing between the air and fuel mixture, thus enhancing the overall combustion characteristics. For the later injection timing, the nitrogen oxide (NOx) emissions decrease at the higher ammonia energy ratio due to the denitrification of the nitrogen oxides (DeNOX) process. Overall, the earlier injection timing appears optimal for the 40% to 70% ammonia energy ratio under the present condition.
Pengabdian Masyarakat Sosialisasi Metris Vertikal Cara Berhitung Lebih Bervariasi Goenawan, Stephanus Ivan; Prasetya, Wibawa; Kurniawan, Angela Arella; Gunawan, Sebastian
Jurnal Pengabdian Masyarakat Charitas Vol. 4 No. 01 (2024): Jurnal Pengabdian Masyarakat Charitas Juni 2024
Publisher : Program Studi Teknik Industri, Fakultas Teknik, Universitas Katolik Indonesia Atma Jaya Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25170/charitas.v4i01.5495

Abstract

Logical abilities and creativity in calculations can be applied in economics where people organize and manage a business activity themselves and bear the risks of their business. He is responsible for his business, financial risks, material and human resources in his business. Technical economists usually act as owners or managers and also as operators of their business activities. Calculation in technical economics is a science that contains how to calculate, how to make considerations in solving a problem, including the feasibility of a business with existing alternatives based on economic factors and criteria. By studying this approach, it is hoped that someone can make the best decision from the many available alternatives. From the description of arithmetic it can be seen that calculations in technical economics involve very technical considerations. So technical economics involves technical analysis, with emphasis on economic aspects and has the aim of assisting decision making. Therefore, in making the decision to do so, a technical economist must be able to make the right decision. The right decision is not a decision without consideration. Of course, to make the right decision, basic considerations are needed. These basics are what are called alternatives in making decisions. This process of many alternatives can be tried to simulate through learning arithmetic calculations which can be done in various or many ways using the vertical metris method.
Forecasting Methods Proposal and Implementation of Distribution Requirement Planning Method to Overcome Unfulfilled Stock Availability at PT. XYZ Natalia, Christine; Gunawan, Sebastian; Liang, Yun Chia; Sugioko, Andre; Tripiawan, Wawan; Fredikson, Marcelinus
Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa & Inovasi Volume 7 Number 1 (2025)
Publisher : Fakultas Teknik Universitas Pancasila

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35814/asiimetrik.v7i1.7314

Abstract

PT. XYZ is a manufacturing company engaged in the automotive sector by producing various automotive components. Based on the results of observations and interviews at PT. XYZ, it is known that there is a shortage of stock, so that customer or consumer requests are not fulfilled at each existing distribution center (DC). Based on the problems that occur, the research result suggestions for the best forecasting method based on the time series plot of each DC request processing using the Distribution Requirement Planning (DRP) method. In addition, with the DRP method, there is additional stock. The company still has remaining stock so it can still meet customer demand for each DC, and the product distribution process runs more regularly if any defective product should be replaced. Based on research results, the DRP method is able to minimize the risk of unfulfilled demand due to product defects.
Usulan Tata Letak Group Technology Pada Fasilitas Workshop PT. Sarana Energi Investama Gunawan, Sebastian; Hidayat, Trifenaus Prabu; Sugioko, Andre
Proceeding Mercu Buana Conference on Industrial Engineering Vol 5 (2023): LEAN AND GREEN FOR SUSTAINABILITY DEVELOPMENT GOALS IN THE I4.0 ERA
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/MBCIE.2023.001

Abstract

PT Sarana Energi Investama operates as an industry in the field of electrical components. Some of the products produced by PT Sarana Energi Investama include LVMDP panels, sub-distribution panels, Lighting panel, Emergency panel, Elevator panels, and others. In this case, the layout owned by PT Sarana Energi Investama is still non-standard in nature and was placed without taking into account the flow of production as well as the frequency and relations between production facilities. In this case, research was conducted regarding the design of the facility layout at the workshop facility owned by PT Sarana Energi Investama using the group technology layout. Group technology layout is considered one of the methods that can be used to design layouts in an effective, efficient, and flexible manner for customized product types and is able to overcome production constraints when the quantity of demand fluctuates. In the study, calculations were carried out using routing sheets, calculating the frequency of transfers, determining relationships between facilities, using rank-order clustering algorithms to design group technology layouts, as well as designing intracellular and overall facility layouts. Based on this research, using the proposed layout can increase the efficiency of moving distances by 40.74%, moving time by 31.25%, and material handling costs by 31.25% within a month.
Co-Authors Christine Natalia Fredikson, Marcelinus Goenawan, Stephanus Ivan Gotama, Gabriel Jeremy Ichiyanagi, Mitsuhisa Jonathan, Leon Kodaka, Masashi Kurniawan, Angela Arella Liang, Yun Chia Mukae, Shinnosuke Okada, Takanobu Shiraishi, Hikaru Sugioko, Andre Takashi Suzuki, Takashi Tamba, Ryota Trifenaus Prabu Hidayat Wawan Tripiawan Wibawa Prasetya Widjaja, Henry Willyanto Anggono Yamamoto, Hikaru Yilmaz, Emir