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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
Aerospace Engineering Humanities 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 Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Social Sciences Other

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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 Abdullah, Kukuh 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.
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.
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.
QUALITY FUNCTION DEPLOYMENT (QFD) UNTUK PENINGKATAN KUALITAS PRODUK SEPATU PT. X: QUALITY FUNCTION DEPLOYMENT (QFD) UNTUK PENINGKATAN KUALITAS PRODUK SEPATU PT.X Ramdhani, Rizky Fajar; Qomusuddin, Ivan Fanani; Nurhayaty, Maria
Jurnal Media Teknologi Vol. 12 No. 1 (2025): Jurnal Media Teknologi
Publisher : Fakultas Teknik UNIGAL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25157/jmt.v12i1.5262

Abstract

Quality Function Deployment (QFD) merupakan metode sistematis untuk menerjemahkan kebutuhan pelanggan ke dalam spesifikasi teknis produk. Penelitian ini bertujuan untuk mengevaluasi efektivitas penerapan QFD dalam meningkatkan kualitas produk, serta menjembatani komunikasi antara tim pemasaran dan pengembangan produk. Studi kasus dilakukan pada perusahaan manufaktur sepatu, dengan pendekatan kualitatif melalui wawancara, survei, dan analisis matriks House of Quality (HoQ). Hasil penelitian menunjukkan bahwa QFD mampu mengidentifikasi prioritas teknis yang paling berdampak terhadap kepuasan pelanggan. Implikasi dari hasil ini dapat digunakan sebagai dasar pengambilan keputusan dalam pengembangan produk yang lebih tepat sasaran.
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.
Fuzzy Logic in Determining Hotel Priorities for The Halal Tourism Industry in Garut City Ramdhani, Rizky Fajar; Romlah, Siti; Fanani, Ivan
Journal of Economicate Studies Vol. 4 No. 2 (2020): Journal of Economicate Studies
Publisher : Islamicate Institute

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32506/joes.v4i2.620

Abstract

Garut Regency is one of the 13 districts designated by the West Java Provincial Government as a halal tourist destination because the various tours that Garut Regency has, such as natural, cultural, special interest, and artificial tourism are very supportive of the development of halal tourism in Indonesia, especially Java. West. Moreover, the majority of Garut residents are Muslim (99.77%). Various selected facilities for sharia tourism, such as hotels, continue to be developed based on the Muslim friendly principle. However, the use of sharia in hotels in Garut as promoted by the Garut Tourism Office is a self-declaration until now, there are no hotels in Garut that already have a halal certificate. So that the problem points to be formulated and known in this study is the extent to which hotels in Garut, especially in the tourist area of ​​Cipanas, have fulfilled the Islamic concept based on Permen Paweka No. 2 of 2014 concerning "Guidelines for Conducting Sharia Hotel Businesses." The approach used in analyzing the hotel is the fuzzy logic approach, which has the advantage that it can be used to analyze data in both exact and social research. This method is applied by researchers to determine hotel priorities based on the product, service, and management variables that are in the criteria for the hilal-1 sharia hotel. These criteria will be included in the fuzzy system variables so that hotels in Garut can be determined whether they are good, good, standard, or bad.
Co-Authors Abdullah, Kukuh Abdullah Akhsani Nur Amalia Ari Putri Abdi Asep Hermawan ASEP HERMAWAN Asep Hermawan Bintang Naufal Fauzan Bintang Nidia Kusuma Daffa Pratama Akmal Dewi , Eki Kania Fanani, Ivan Febrian, Angga Arisandi Hady Sofyan Haris SAndi Yuda Herry Firmansyah Ivan Fanani Qomusuddin Kosim, Komara 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