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All Journal OPERATION EXCELLENCE: Journal of Applied Industrial Engineering Jurnal Sains dan Teknologi: Jurnal Keilmuan dan Aplikasi Teknologi Industri Journal of Economicate Studies Industry Xplore Jurnal Media Teknik dan Sistem Industri Jurnal Teknik Industri Terintegrasi (JUTIN) International Journal of Applied Technology Research Jurnal Media Teknologi Teknologika Jurnal Manajemen Bisnis dan Organisasi Journal of Management and Industrial Engineering (JMIE) Journal of Information System, Technology and Engineering journal of Renewable Engineering KONTAN: Jurnal Ekonomi, Manajemen dan Bisnis
Rizky Fajar Ramdhani
Sekolah Tinggi Teknologi Wastukancana Purwakarta
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ANALISA KELAYAKAN FINANSIAL PEMBANGUNAN INCINERATOR LIMBAH RUMAH SAKIT Oetomo, Dedi Setyo; Ramdhani, Rizky Fajar; Wijaya, Mochamad Fauzy
Jurnal Manajemen Bisnis Dan Organisasi Vol 2 No 1 (2023): Jurnal Manajemen Bisnis Dan Organisasi (JMBO)
Publisher : Yayasan Pendidikan Cahaya Budaya Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58290/jmbo.v2i1.118

Abstract

Limbah Bahan Berbahaya dan Beracun (LB3), baik limbah medis maupun limbah industri, belum dapat terolah dengan baik dan benar. Selain dari sisi volume LB3 yang sangat banyak dan lemahnya pengawasan Pemerintah, perusahaan penyedia jasa pengolahan LB3 yang berizin juga sangat terbatas. Kondisi dan keterbatasan ini mengakibatkan pengelolaan LB3 yang tidak memenuhi standar. Oleh karena itu, guna menanggulangi masalah pengelolaan LB3, diperlukan analisa kelayakan usaha Incinerator dilihat dari aspek finansial. Perhitungan Net Present Value (NPV) positif, yakni sebesar Rp. 4.288.529.638.55,- ,Internal Rate of Return (IRR) adalah 35%, dimana nilai IRR ini lebih besar dari pada discount factor yang telah diharapkan yakni sebesar 15, Payback Period diketahui bahwa jangka waktu pengembalian atas invetasi adalah selama 2 Tahun 3 bulan dan 9 hari (lebih kecil dari umur investasi) sehingga bisnis ini layak untuk dijalankan.
Analisis Line Balancing Menggunakan Metode Ranked Position Weight Pada Body Wuling Air Ev Kukuh Abdullah Abdullah; Rizky Fajar Ramdhani; Rikzan Bachrul Ulum; Haris SAndi Yuda
Jurnal Teknologika Vol 14 No 1 (2024): Jurnal Teknologika
Publisher : Sekolah Tinggi Teknologi Wastukancana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51132/teknologika.v14i1.303

Abstract

ABSTRAKDalam membangun lini produksi baru pada suatu proses manufaktur harapan utama pada lini produksi tersebut adalah mampu membuat produk yang efektif dan efisien.Hal ini diterapkan pada system produksi pada PT SGMW Motor Indonesia pada lini produksi baru pada perakitan mobil lsitrik. Salah satu metode yang dilakukan dalam menganalisis efisiensi lini produksi tersebut adalah menganalisis dari segi keseimbangan lintasan (line balancing) yang bertujuan untuk mengetahui efisiensi stasiun kerja, kondisi keseimbangan lintasan dan nilai smoothing index. Hal ini dilakukan agar tidak ada pemborosan proses pada lini produksi tersebut sehingga dari manajemen tidak ada biaya operasional produksi yang terbuang. Metode line balancing yang digunakan dalam penelitian ini adalah metode line balancing ranked position weight yaitu proses pengidentifikasi kegagalan pada dalam suatu proses produksi dengan menentukan bobot – bobot pada elemen kerja proses produksi tersebut.
MODEL SIMULASI PERSEDIAAN BAHAN BAKU KEDELAI UNTUK INDUSTRI TAHU DI KABUPATEN PURWAKARTA MENGGUNAKAN SISTEM DINAMIS (Studi Kasus: Pabrik Tahu “X”) Oetomo, Dedy Setyo; Ramdhani, Rizky Fajar; Febrian, Angga Arisandi; Amalia, Akhsani Nur
KONTAN: Jurnal Ekonomi, Manajemen dan Bisnis Vol 3, No 2 (2024): KONTAN: Jurnal Ekonomi, Manajemen dan Bisnis
Publisher : CV Widina Media Utama

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59818/kontan.v3i2.408

Abstract

Tofu factory “X” is a tofu factory located in Purwakarta Regency, West Java. Purchasing soybeans in large quantities is very risky, because the price of soybeans is very fluctuating. The impact received is when purchasing the price of soybeans purchased when the price is high but when making production at a later date the price of soybeans is falling. This will greatly affect the price of tofu later, because the price sold does not match the market price. The dynamic system model for the availability of soybeans at the “X” tofu factory is in the first scenario the existing model of soybean inventory at the “X” tofu factory. Then the second scenario run is to increase the safety stock by 0.05 or 5%. As for the third scenario used is to use lot size using sack units, in each sack containing 50 kg. Based on the results of the scenarios that have been run, the best scenario that has been simulated in this dynamic system has been chosen. The conditions that occur in this first scenario are models that match the existing. In this first scenario can provide a profit of Rp. 491,898,600.00. Compared to the second scenario of Rp. 467,765,400.00 and the third scenario of Rp. 480,605,800.00.ABSTRAKPabrik tahu “X” merupakan pabrik tahu yang terletak di daerah Kabupaten Purwakarta, Jawa Barat. Pembelian kedelai dalam jumlah banyak sangat beresiko, karena harga dari kacang kedelai ini sangat fluktuaktif. dampak yang diterima adalah ketika melakukan pembelian harga kedelai yang dibeli saat sedang harga tinggi namun ketika melakukan produksi dikemudian hari harga kedelai sedang turun. Hal ini akan sangat berpengaruh terhadap harga tahu nantinya, karena harga dijual tidak sesuai dengan harga dipasar. Model sistem dinamis untuk ketersediaan kacang kedelai pada pabrik tahu “X” adalah pada skenario pertama model eksisting persediaan kacang kedelai di pabrik tahu “X”. Kemudian skenario kedua dijalankan adalah dengan menambah safety stock sebesar 0,05 atau 5%. Sedangkan untuk skenario ketiga digunakan adalah menggunakan lot size menggunakan satuan karung, dalam setiap karung berisikan 50 kg. Berdasarkan hasil skenario yang telah dijalankan, telah terpilih skenario terbaik yang telah disimulasikan pada sistem dinamis ini adalah skenario pertama. Kondisi yang terjadi dalam skenario pertama ini adalah model yang sesuai dengan eksisting. Pada skenario pertama ini dapat memberikan keuntungan sebesar Rp. 491.898.600,00. Dibandingkan dengan skenario kedua sebesar Rp. 467.765.400,00. dan skenario ketiga sebesar Rp. 480.605.800,00.
Usulan Perbaikan Proses Bisnis Departemen J20 di PT Indorama Synthetics Tbk dengan Menggunakan Metode Business Process Reengineering Dedy Setyo Oetomo; Rizky Fajar Ramdhani
Jurnal Media Teknik dan Sistem Industri Vol 5, No 2 (2021)
Publisher : Universitas Suryakancana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35194/jmtsi.v5i2.1416

Abstract

The business process of the J20 production department is currently experiencing obstacles in terms of information delivery, production report, maintenance report, and problem information that causes decision making is often irrelevant. This is due to the use of paper media with a long bureaucratic flow so that the cycle time becomes inefficient. This study used business process reengineering, modeling business process in business process modeling notation (BPMN), and supporting research problem analysis used fishbone diagram. The result showed changes in a process flow, job desk, unit elimination, and proposed design of information systems in the form of application software as a solution to the problems studied, so that it is expected to obtain process time efficiency of 65.1% and cycle time of 99.2% of the previous total time. Proses bisnis departemen produksi J20 saat ini mengalami hambatan dalam hal penyampaian informasi, laporan hasil produksi, laporan maintenance, serta informasi problem, yang menyebabkan pengambilan keputusan sering kali terjadi bias. Hal ini di sebabkan oleh penggunaan media kertas dengan alur birokrasi yang panjang sehingga waktu siklus menjadi tidak efisien. Pada penelitian ini digunakan metode Business Process Reengineering, dengan memodelkan bisnis proses dalam Business Process Modelling Notation (BPMN), serta pendukung analisa masalah penelitian digunakan diagram tulang ikan. Hasil penelitian menunjukan adanya perubahan alur proses, jobdesk, eliminasi unit, serta usulan perancangan sistem informasi berupa software aplikasi sebagai solusi dari permasalahan yang diteliti, sehingga diharapkan dapat diperoleh efisiensi waktu proses sebesar 65,1% dan waktu siklus sebesar 99,2% dari total waktu sebelumnya.
PENENTUAN KEBIJAKAN PERSEDIAAN SPARE PART JOK MOBIL DENGAN PENDEKATAN METODE ABC, ECONOMIC ORDER QUANTITY (EOQ), PERIOD ORDER QUANTITY (POQ) UNTUK MENURUNKAN BIAYA PERSEDIAAN PT. XYZ Bintang Naufal Fauzan; Asep Hermawan; Rizky Fajar Ramdhani
Journal of Management and Industrial Engineering (JMIE) Vol. 3 No. 2 (2024): Journal of Management and Industrial Engineering (JMIE)
Publisher : LPPM Sekolah Tinggi Teknologi Nusantara Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

PT. XYZ is a manufacturing company in the automotive industry that produces car seats. This thesis explains how to determine the amount of spare part inventory that is more economical and efficient. The technique for determining inventory in this research is determining the most economical price (Economic Order Quantity), safety stock, reordering (Reorder Point), and the number of orders per period (Period Order Quantity). Based on the results of research using the EOQ method, the number of spare part purchases was 112,149 pieces, the economic inventory cost (EOQ) was IDR 3,350,290 for reorders per period (ROP), with a quantity of 139,595 pieces. The quantity per period (POQ) is around 99 orders with a total quantity of 532,372.40 pieces, for inventory costs according to the period (POQ) is IDR 3,195,422. Conclusions and this research shows that the order quantity is more economical compared to the method used by PT XYZ.    
Smart City Priority Innovation Assessment In West Bandung Regency Ramdhani, Rizky Fajar; Sofyan, Hady
Journal of Renewable Engineering Vol. 2 No. 2 (2025): JORE - April
Publisher : Pt. Anagata Sembagi Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62872/40v6w830

Abstract

This study aims to assess the implementation of smart city innovations in West Bandung Regency in 2024, focusing on evaluating user satisfaction with the priority applications that have been launched. The research method uses the Unified Theory of Acceptance and Use of Technology (UTAUT) model to measure Performance Expectancy, Effort Expectancy, Social Influence, and Facilitating Conditions variables, as well as their impact on customer satisfaction. Data were collected through questionnaires from public servants associated with 37 smart city innovations. The results showed that Smart Branding: Visit KBB had the highest Performance Expectancy and Facilitating Conditions scores, while BA QRIS and Smart Branding: Visit KBB applications had the highest Effort Expectancy scores. The implications of this research are to provide recommendations for improving the effectiveness and acceptance of smart city applications in West Bandung Regency, as well as providing insights for the development of future smart city programs.
Feasibility Analysis Of Construction Of A Wall Factory Precast Concrete In Samarinda, East Kalimantan At PT. RA Beton Dedy Setyo Oetomo; Rizky Fajar Ramdhani
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.
Analysis of the Development of Downstream Copper Industry in Indonesia to Obtain Maximum Added Value Using Dynamic Systems Dedy Setyo Oetomo; Eki Kania Dewi; Rizky Fajar Ramdhani
Journal of Information System, Technology and Engineering Vol. 2 No. 3 (2024): JISTE
Publisher : Yayasan Gema Bina Nusantara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61487/jiste.v2i3.85

Abstract

This research aims to design a dynamic system model for the downstream copper processing industry. The secondary data obtained is data provided by the BKPM Strategic Investment Downstreaming Expert Team. Vensim software is used to simulate downstream development in the form of CLD and SFD from 2024 to 2045. The results of the value-added simulation resulted in an increase in the added value of copper cathode by 2.15 times, the added value of cathode slab by 1.62 times, the added value of copper billet by 1.65 times, the added value of copper bar &rods by 1.08 times, the added value of copper tube by 1.02 times, the added value of copper strip by 1.39 times, and the added value of copper wire by 1.58 times. After a sensitivity analysis of the selling price at CAGR and an increase in energy costs by 20%, there was a change in the average value-added margin, so that the increase in added value changed which resulted in an added value of copper cathode of 1.9 times, added value of cathode slab of 1.47 times, added value of copper billet of 1.49 times, added value of copper bar &rods of 1.26 times, added value of copper tube of 0.93 times, added value of copper strip of 0.98 times, and added value of copper wire of 1.44 times.
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.
Analisis Pengendalian Kualitas untuk Mengurangi Ketidakstabilan Nilai Larutan Brine Chiller Viscose Menggunakan Metode Statistical Process Control pada Departement Chiller di PT. XYZ Kosim, Komara; Ramdhani, Rizky Fajar; Amalia, Akhsani Nur
Jurnal Teknik Industri Terintegrasi (JUTIN) Vol. 8 No. 3 (2025): July
Publisher : LPPM Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jutin.v8i3.49542

Abstract

PT. XYZ is one of the largest artificial rayon fiber companies in the world that produces artificial fibers made from cellulose with quality that matches natural fibers. The purpose of this study is to determine the current quality control method for defective products of viscose brine chiller solution at PT. XYZ. The results of the study revealed that quality control at PT. XYZ is not good, seen from the individual moving range control chart at several points outside the upper control limit, namely: 27, 57 and for the lower control limit, namely: 55.
Co-Authors Akhsani Nur Amalia Ari Putri Abdi Asep Hermawan ASEP HERMAWAN Asep Hermawan Bintang Naufal Fauzan Bintang Nidia Kusuma Daffa Pratama Akmal Dedy Setyo Oetomo Eki Kania Dewi Fanani, Ivan Febrian, Angga Arisandi Hady Sofyan Haris SAndi Yuda Herry Firmansyah Ivan Fanani Qomusuddin Kosim, Komara Kukuh Abdullah Abdullah Muhammad Ali Akbar Muhammad Ali Akbar Nurhayaty, Maria Oetomo, Dedi Setyo Oetomo, Dedy Setyo Qomusuddin, Ivan Fanani Rikzan Bachrul Ulum Sandra Damayanti Shaleha, Rahma Luthfia Siti Romlah Siti Romlah Sofyan, Hady Sri Nuraeni Tarman Wijaya, Mochamad Fauzy Yayan Heru Haerudin