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Oetomo, Dedy Setyo
Sekolah Tinggi Teknologi Wastukancana
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Social Sciences Other

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A Dynamic System Model for Multi-Echelon Inventory Policy Optimization Considering Bullwhip Effect and Supply chain Disruptions in the Sport Footwear Industry oetomo, Dedy Setyo; Fajar Ramdhani, Rizky; Hermawan, Asep
Jurnal Teknologika Vol 15 No 1 (2025): Jurnal Teknologika
Publisher : Sekolah Tinggi Teknologi Wastukancana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51132/teknologika.v15i1.447

Abstract

This research develops a dynamic system model to optimize inventory policies in multi-echelon supply chains within the sport footwear industry, addressing challenges from the bullwhip effect and supply chain disruptions. The sports footwear sector faces unique inventory management challenges due to complex demand patterns influenced by seasonality, fashion trends, and competitive dynamics. Our comprehensive system dynamics model captures the intricate relationships between four supply chain echelons: retailers, distributors, manufacturers, and raw material suppliers. The model integrates machine learning algorithms—specifically Long Short-Term Memory (LSTM) neural networks—for adaptive demand prediction and employs genetic algorithm optimization to determine optimal inventory parameters under various disruption scenarios. Using real-world data from a leading sports footwear manufacturer, we validated the model under normal operations and three distinct disruption scenarios: raw material shortages (45% reduction for 6 weeks), manufacturing capacity constraints (30% reduction for 8 weeks), and transportation disruptions (doubled lead times for 4 weeks). Results demonstrate that our proposed hybrid model reduces overall inventory costs by 18.7% compared to traditional policies while maintaining a 97.2% service level. The integration of machine learning for demand forecasting reduced prediction errors by 43.6% compared to conventional methods, directly mitigating the bullwhip effect by decreasing the order variability coefficient from 0.89 to 0.61 at the supplier level. Furthermore, the model enhanced supply chain resilience by reducing recovery time by 42% following major disruptions. This research contributes to the theoretical understanding of complex supply chain dynamics and practical applications for inventory management in volatile industries, offering a robust framework for decision-making under uncertainty.
Feasibility Study of Nickel Mixed Hydroxide Precipitate (MHP) Smelter Construction Plan with High Pressure Acid Leaching (HPAL) Technology Santika, Dewi; Oetomo, Dedy Setyo; Yudha , Haris Sandi
Journal of Social Science and Business Studies Vol. 3 No. 3 (2025): JSSBS
Publisher : Yayasan Gema Bina Nusantara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61487/jssbs.v3i3.171

Abstract

This study evaluates the feasibility of building a nickel Mixed Hydroxide Precipitate (MHP) plant of PT. X with a capacity of 12,000 tons per year. The analysis shows that the potential demand for MHPs in the national and global markets continues to increase, driven by the growth of the nickel battery-based electric vehicle industry. The planned production capacity is projected to be optimally absorbed. The plant is designed using High Pressure Acid Leaching (HPAL) technology that utilizes low-grade nickel ore from multiple locations to reduce dependence on a single mine. Other supporting factors include adequate infrastructure, manpower, regulatory support, and market potential. Raw material requirements per year include 414,000 tons of laterite ore, 148,100 tons of H₂SO₄, 41,700 tons of CaO, and 2,870 tons of MgO. Initial investment (CAPEX) is estimated at $108.8 million with an annual operating expense (OPEX) of $93.5 million. The main equipment includes an autoclave, thickener, filter press, and rotary dryer. Financial analysis shows the project is feasible with a Payback Period of 4.85 years, an IRR of 19% above the MARR of 15%, and a positive NPV of $14.03 million at a discount of 19%. The sensitivity test showed that the project remained viable despite increased operational costs, so it was considered technically and financially prospective to support Indonesia's nickel downstreaming.
Feasibility Study for The Proposed Poultry Feed Manufacturing Plant by PT. X: Implementing Agricultural Commodity Downstreaming in Gresik, East Java Rahmah, Mutiara Julia; Oetomo, Dedy Setyo; Ramdhani, Rizky
Journal of Social Science and Business Studies Vol. 3 No. 3 (2025): JSSBS
Publisher : Yayasan Gema Bina Nusantara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61487/jssbs.v3i3.173

Abstract

This study aims to analyze the feasibility of establishing a poultry feed factory by PT. X in Gresik, East Java, as part of Indonesia’s national agricultural downstreaming strategy. The feasibility study evaluates multiple aspects, including technical and technological considerations, raw material availability, and market and marketing potential, particularly for both domestic and export opportunities. The assessment also includes the estimation of local raw material requirements and the identification of appropriate equipment and technology for the factory’s operations. From a market perspective, the study evaluates current and projected demand for poultry feed products, supported by the growing livestock sector and increasing export prospects. From a financial standpoint, the project shows strong viability. Key financial indicators demonstrate positive outcomes: the Net Present Value (NPV) is greater than zero, the Internal Rate of Return (IRR) exceeds the prevailing loan interest rate, and the Payback Period falls within an acceptable and efficient timeframe. These indicators collectively reflect the project’s potential to generate sustainable profits and recover the initial investment within a reasonable period. Considering all evaluated aspects, the development of PT. X's poultry feed factory in Gresik is deemed feasible in terms of technical implementation, market potential, and financial returns. Moreover, the project aligns with national objectives to enhance agricultural value chains through industrial downstreaming, optimize the use of local resources, and contribute to regional and national economic development. As such, the proposed investment not only supports agribusiness growth but also reinforces broader economic resilience and food security initiatives in Indonesia.
A Feasibility Study Of 100 Kl/Day Bioethanol Plant From Sugarcane Production As Part Of National Energy Mix Strategy Oetomo, Dedy Setyo
Sainteks: Jurnal Sain dan Teknik Vol 7 No 02 (2025): September
Publisher : Universitas Insan Cendekia Mandiri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37577/sainteks.v7i02.959

Abstract

This study evaluates the technical and economic feasibility of constructing a 100 KL/day bioethanol production plant from sugarcane as part of Indonesia's national energy mix strategy. The research employs comprehensive analysis including mass balance, energy balance, technical design, and financial evaluation. The plant design utilizes fermentation and distillation processes with an annual production capacity of 36,500 KL bioethanol. Mass balance calculations show that 1,200 tons/day of sugarcane feedstock is required, producing 100 KL ethanol, 480 tons bagasse, and 120 tons vinasse daily. Energy balance analysis indicates the plant can achieve energy self-sufficiency through bagasse combustion for steam and electricity generation. Technical evaluation confirms the feasibility of implementing proven bioethanol production technology. Financial analysis reveals total investment requirement of USD 45.2 million with Net Present Value of USD 12.8 million, Internal Rate of Return of 18.5%, and payback period of 6.2 years at 12% discount rate. Sensitivity analysis demonstrates project robustness against feedstock price and ethanol selling price variations. The study concludes that the bioethanol plant is technically feasible and economically viable, contributing significantly to Indonesia's renewable energy targets and rural economic development while reducing dependency on fossil fuel imports
Dynamic System Modeling Analysis of CPO-FAME-Biodiesel Distribution for B40 Quota Fulfillment in Java Island 2025 Shaleha, Rahma Luthfia; Oetomo, Dedy Setyo; Ramdhani, Rizky Fajar
Journal of Information System, Technology and Engineering Vol. 3 No. 3 (2025): JISTE
Publisher : Yayasan Gema Bina Nusantara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61487/jiste.v3i3.172

Abstract

This research aims to analyze the distribution cost structure and transportation requirements for CPO-FAME-Biodiesel to meet B40 quota implementation in Java Island using a dynamic system approach. This study uses dynamic system simulation with Vensim software to model CPO-FAME-Biodiesel distribution from Sumatra and Kalimantan to Java Island, utilizing data from Ministry of Energy and Mineral Resources and GAPKI with 2025 projections. The simulation reveals that meeting the B40 quota in Java Island requires substantial infrastructure investment with total transportation costs exceeding IDR 1.3 trillion, highlighting the massive scale and logistical complexity of national biodiesel implementation. Analysis identifies fleet tariff, shipping frequency, fleet capacity, raw material prices, and conversion ratios as the primary cost drivers affecting distribution efficiency. Cost optimization can be achieved through strategic shipping frequency management, capacity optimization, efficient fleet fuel management, and implementation of centralized production systems with hub-and-spoke distribution networks. This research contributes essential strategic insights for policymakers in developing cost-effective transportation frameworks and infrastructure planning for Indonesia's national biodiesel policy implementation.
Jadwal Induk Produksi Thinner dengan Perhitungan RCCP Bill of Labor Approach dan Sistem Dinamis (Studi Kasus: Pabrik Produksi Thinner PT XY) Ramdan, Asep; Hermawan, Asep; Oetomo, Dedy Setyo
Jurnal Teknik Industri Terintegrasi (JUTIN) Vol. 8 No. 4 (2025): October
Publisher : LPPM Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jutin.v8i4.50566

Abstract

PT. XY is one of the largest paint and coating material manufacturers in Asia. In addition to producing paint, the company also produces paint thinners. In its production process, the company faces difficulties in estimating the optimal production quantity for each period, often experiencing urgent processes, delivery delays, and even disruptions to the production process due to sudden schedule changes. This research will use the Exponential Smoothing forecasting method to predict demand in the coming period. A Master Production Schedule (MPS) calculation was also performed, which was then followed by RCCP. This method is used to compare production needs with the company's available capacity. The Master Production Schedule (MPS) that can be planned at PT. XY for 1 year from January 2025 – December 2025 is 7,926,032 Liters, produced by 32 people each month with a UPRT of 7,421,324 Liters and a Safety Stock of 33,025 Liters per month, with respective proportions of 61% IU products, 8% TIU products, and 31% SEMI products.
Analysis of Financial Feasibility of Construction of a Stainless-Steel Factory Capacity 1500 KTPA at PT. X in the IMIP Morowali Area Oetomo, Dedy Setyo; Muslim, Mentari Nisaaul; Ramdhani, Rizki Fajar
Journal of Social Science and Business Studies Vol. 2 No. 3 (2024): JSSBS
Publisher : Yayasan Gema Bina Nusantara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61487/jssbs.v2i3.84

Abstract

This study was conducted to test the financial viability of building a stainless-steel plat on PT. X using method of financial analysis. The result of this study showed with net present value (NPV) US$ 901,972,225.60; Internal Rate of Return (IRR) of 15%; MARR 10%; Payback (PP) for 4 year and BEP US$372.39/ton for production 1,500,000/year. According to analytical research, the planned construction of the PT.X is a financially viable business to run and the project is acceptable. Each of these methods yields a distinct value for the computation of the payment duration. The investment proposal is deemed suitable based on the computation of the net present value, profitability index, and internal rate of return, as they meet the corresponding eligibility conditions. The inclusion of the time value of money is crucial when calculating the return period using NPV, ROI, and IRR. This ensures that the project's long-term benefits are taken into account. Consequently, it can be inferred that the assessment of the proposal's financial viability can be deemed acceptable or appropriate.
Feasibility Study for Construction of N-Type HJT Solar Cell Manufacturing Plant with Production Capacity of 2 GWp in Batang Industrial Estate, Indonesia Oetomo, Dedy Setyo; Adwiyah , Rabiatul
Journal of Social Science and Business Studies Vol. 3 No. 1 (2025): JSSBS
Publisher : Yayasan Gema Bina Nusantara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61487/jssbs.v3i1.126

Abstract

This study evaluates the technical and economic feasibility of establishing a 2 GWp N-Type heterojunction (HJT) solar cell manufacturing facility in Batang Industrial Estate, Indonesia. The proposed plant utilizes predominantly Chinese-manufactured equipment for key processes including PECVD systems, metallization lines, and testing equipment, with silicon wafers as the primary raw material. A comprehensive analysis incorporating technical, financial, operational, and market aspects demonstrates project viability with an IRR of 18.2% and payback period of 5.3 years. The total investment of USD 850 million encompasses equipment, infrastructure, and working capital. Results indicate favorable technical feasibility with established equipment manufacturers meeting international quality standards. Financial analysis shows strong potential returns, supported by growing regional solar panel demand and Batang's strategic advantages. Key risks identified include silicon wafer price volatility, technological obsolescence, and market competition, with structured mitigation strategies proposed.
Technical Analysis of Erection in Pilot Plant Industries at Industrial Vegetable Oil or Industrial Lauric Oil Oetomo, Dedy Setyo
Journal of Information System, Technology and Engineering Vol. 2 No. 1 (2024): JISTE
Publisher : Yayasan Gema Bina Nusantara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61487/jiste.v2i1.62

Abstract

One source for improving the economy of the green fuel industry is to replace the conventional raw material CPO/CPKO (in this case, formerly processed into RBDPO) with the special palm oil IVO/ILO (industrial vegetable oil or lustrial linoleic oil). The technical aspects to be discussed are the selection of technology, production capacity and production plan, mass balance, production process description, technical equipment specifications, and availability of raw materials, including mechanical and electrical analysis. The abbreviation for the results of this study is that the raw material used is CPO/CPKO, and the product produced is IVO/ILO, which will be used as green fuel material. The process selected is the selection of the production process. IVO/ILO refers to the process of production of CPO, and RBDPO refers to the SNI standard or specification 8875:2020. Its production capacity is 10 tph, the TBS raw material requirement is +540–700 tons per day, and the energy requirement for wood work stations such as reception stations, thresher stations, pressing stations, clarification stations, seed processing stations, and earthquake amps stations Boiler Station and Bleaching Station reach 266.6 KW, where electricity and steam energy are obtained from fiber raw materials and palm fruit shells.
Feasibility Analysis Of Construction Of A Wall Factory Precast Concrete In Samarinda, East Kalimantan At PT. RA Beton Oetomo, Dedy Setyo; Ramdhani, Rizky Fajar
Journal of Information System, Technology and Engineering Vol. 2 No. 2 (2024): JISTE
Publisher : Yayasan Gema Bina Nusantara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61487/jiste.v2i2.67

Abstract

The main objective of a business feasibility study is to assess opportunities for a business project and whether the project is worth continuing or not. Results of calculation analysis on PT RA Beton Precast Concrete Wall Product Manufacturing Plant Design with an average production capacity of 128,772 pcs/year with two product designs (Type A-A and Type B-B). Based on the cash flow of the development investment plan, the new factory PT. RA Beton requires capital of Rp. 169.866.126.151.The calculations using the four methods, namely payback period (PP), produce results of 2 years and 4 months less than the economic life or maximum payback period, which is 10 years. Next, using the net present value (NPV) method, the results obtained are the NPV1 value > 0 from 75% interest amounting to Rp. 5,111,998,649, and the NPV2 value < 0 from 80% interest amounting to -Rp. 5,826,301,054. In calculating the Internal Rate of Return (IRR), results were obtained with a value of 94% greater than the applicable interest rate, namely 12%. Each method produces a different value; calculating the payback period concludes that the investment proposal can be accepted and declared feasible because it meets the criteria.
Co-Authors Adwiyah , Rabiatul Afif Fawa Idul Fata Akhsani Nur Amalia Aldo Fauzi Dherryawan Ari Putri Abdi Arijanti, Susi ASEP HERMAWAN Asep Hermawan Asep Hermawan Dendy K. Pramudito Dewi , Eki Kania Dewi Santika Fatah, Abdurrohim Febrian, Angga Arisandi Imas Widowati Iskandar, Hendi Kraugusteeliana Kraugusteeliana Muhammad Danial Muslim, Mentari Nisaaul Nada, Muhammad Bisyri Nuri Aslami Rahmah, Mutiara Julia ramdan, asep Ramdhani, Rizki Fajar Rizky Fajar Ramdhani Rizky Ramdhani, Rizky Shaleha, Rahma Luthfia Siti Zaenab Nur Hasanah Sutartiah, Farliana Wanwan Jamaludin Yanto RUkmana, Arief Yudha , Haris Sandi