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All Journal International Journal of Supply Chain Management Journal of Applied Engineering and Technological Science (JAETS)
Taufik Roni Sahroni
Bina Nusantara University
Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Electrical & Electronics Engineering Engineering Environmental Science Industrial & Manufacturing Engineering Transportation

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Optimization of an Integrated Steel Retail Supply Chain Distribution in Multi-echelon Environment Ramkrishna Punjaji Manatkar; Manoj Kumar Tiwari; Taufik Roni Sahroni
International Journal of Supply Chain Management Vol 8, No 1 (2019): International Journal of Supply Chain Management (IJSCM)
Publisher : International Journal of Supply Chain Management

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Abstract

This paper presents the integrated, multi-objective, multi-echelon, multi-product environment optimization model for steel retail distribution network. Model formulated covers retail supply chain processes applicable for steel products starting from production of different grades of material, its transfer to company warehouse, then to distributor warehouse cum service center and finally to retailer. The input parameters considered are the cost of opening new warehouse, order costs, administrative cost, inventory holding cost, transportation costs and desired service level for serving customers. In order to solve the problem a Territory Defined Evolutionary Algorithm (TDEA) is utilized. The paper discusses a realistic application of the validity of the model. The model developed supports organization and distributor in deciding the optimal location for minimizing inventory and transportation cost after taking into account desired service level requirements of retail customers. The framework presented further assist distributor in allocating the retailers to respective DC. Moreover, the model formulated benefits distributor and retailers in maintaining optimal regular and safety stock after taking into account variation in lead time and demand.
Application of an Open Source Spreadsheet Solver in Single Depot Routing Problem Taufik Roni Sahroni; Leo Adi Anggoro; Satria Ismail; Aerna Aerna
International Journal of Supply Chain Management Vol 7, No 6 (2018): International Journal of Supply Chain Management (IJSCM)
Publisher : International Journal of Supply Chain Management

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Abstract

The VRP has been broadly developed with additional feature such as deliveries, selective pickups time windows. This paper presents the application of an open source spreadsheet solver in single depot routing problem. This study focuses on Fast Moving Consumer Goods (FMCG) Company as a case study. The objective of this research is to minimize the distance travel. This research begins by collecting data from a respective FMCG Company. An FMCG company based in Jakarta, Indonesia provides drinking water packaged in the gallon. This FMCG Company has two distributions characteristic. Head office distribution was used in this case study due to highest internally rejected by the company such as un-routed order, no visit, not enough time to visit and transportation issue. Based on computational results, overall solutions to delivered 214 gallons to 26 customers having total distance traveled 56.76 km, total driving time 2 hour and 49 minutes, the total driver working time 7 hours and 57 minutes. Total savings of distances traveled between current route and the proposed solutions using open source spreadsheet solver is 7.25 km. As a result, by using open source spreadsheet solver in single depot routing problem can be implemented in FMCG Company.
An Investigation of Optimum Safety Stock Level for Maintenance, Reliability and Operation Materials based on Criticality of Material and Equipment Taufik Roni Sahroni; Bambang Sudjatmiko
International Journal of Supply Chain Management Vol 7, No 2 (2018): International Journal of Supply Chain Management (IJSCM)
Publisher : International Journal of Supply Chain Management

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Abstract

This paper presents a study to determine a safety stock level calculation for Maintenance, Reliability and Operation (MRO) materials in oil and gas industries. The challenge to set a safety stock for MRO materials is uncertainty of demand and lead time especially in industry where the operation plant is far away from materials manufacturer. Many models currently used to calculate the safety stock is independent between inventory control as service provider and maintenance as service receiver. Current models of safety stock are referred to equipment reliability or stock out situation to measure the effectiveness of the models. In this paper, studied the correlation between maintenance activities and inventory control strategy to provide acceptable service level thru combined equipment and material criticality with optimum inventory safety stock level by linked the acceptable downtime of equipment with lead time of ordering materials. Based on this study and comparison of the proposal with available models related to equipment and stock out focus, the proposal result is between current models of safety stock level calculation result
Effectiveness Analysis of Hydraulic Torque Wrench Machine Using Failure Mode and Effect Analysis (FMEA) and Logic Tree Analysis Study Case on Heavy Equipment Manufacturing Dhadung Prihananto; Taufik Roni Sahroni
Journal of Applied Engineering and Technological Science (JAETS) Vol. 5 No. 1 (2023): Journal of Applied Engineering and Technological Science (JAETS)
Publisher : Yayasan Riset dan Pengembangan Intelektual (YRPI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37385/jaets.v5i1.1920

Abstract

Production quality in terms of process efficiency and quality in the manufacturing industry must always be improved in order to maintain customer confidence. PT XYZ as a heavy equipment assembly company is one of the companies that depends on process reliability for a smooth production process. Based on this, the problems raised in this study focus on increasing the efficiency of the process of installing bolts on slew bearings. By using Overall Equipment Efficiency (OEE) and Process Capability (CpK) as the main benchmarks for measuring the quality of the production process where the latest data shows the average OEE value is at 18.53%, while the CpK value for the bolt tightening process is at 0 ,67. The OEE and CpK figures obtained show that the process quality is still not optimal and needs to be improved. The purpose of this research is to identify and prevent as many factors as possible that can lead to process failure. The methods used to evaluate processes and to identify where and how a process might fail are Failure Mode and Effect Analysis (FMEA) and Logic Tree Analysis (LTA). Both methods are used to identify and prevent as many factors as possible that can lead to a process failure. The results of research using the FMEA and LTA methods show that in the process of installing slew bearing bolts there is a process that needs to be improved because the RPN value is quite high, namely above 125. Some suggestions for improvement such as the use of a manipulator arm on a torque tool and the implementation of a manufacturing execution system (MES) can reduce the RPN value from above 125 to 28, where the process obtained is better than before.
Co-Authors Aerna Aerna Bambang Sudjatmiko Dhadung Prihananto Leo Adi Anggoro Manoj Kumar Tiwari Ramkrishna Punjaji Manatkar Satria Ismail