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All Journal Journal of Industrial Engineering
Ineu Widaningsih Sosodoro
President University
Industrial & Manufacturing Engineering

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Penerapan Non Delay Schedule Dengan Mempertimbangkan Machine Availability Constraint untuk Meminimasi Makespan pada PT Autotech Perkasa Mandiri, Cikarang, Jawa Barat Anastasia Lidya Maukar; Ineu Widaningsih Sosodoro; Stefanus Setiady
JIE Scientific Journal on Research and Application of Industrial System Vol 5, No 1 (2020)
Publisher : President University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33021/jie.v5i1.1272

Abstract

One of the efforts to increase production efficiency is by implementing the right scheduling. PT Autotech Perkasa Mandiri is the job shop production system. Currently implements a heuristic method with a priority dispatch rule, namely the Earliest Due Date (EDD). The EDD rule has the highest priority for the job with the earliest due date to be processed on a machine. This study is to purpose a more optimal scheduling by comparing the makespan of the current schedule with the proposed one. Previous research is the non delay schedule without considering machine availability constraints. In this study, machine availability constraints are taken into account, thus, they are more realistic when applied to the actual problem. The algorithm used is a non delay schedule with working time window (WT-NSA). Machine availability constraints that are taken into account are lunch-break hours (12: 00-13: 00) and shift changes (17: 00-08: 00). From the analysis, it is obtained that makespan from non delay schedule is 23 hours 6 minutes, while makespan from WT-NSA is 26 hours 6 minutes, and makespan from EDD schedule is 38 hours 54 minutes. Non-delay schedule has the smallest makespan, which is 23 hours 6 minutes, but WT-NSA is more realistic when applied to the real problem.
Designing of Inventory Control for Aluminum Industry Ineu Widaningsih Sosodoro; Anastasia Lidya Maukar; Intan Puspita Pribadi
JIE Scientific Journal on Research and Application of Industrial System Vol 3, No 1 (2018)
Publisher : President University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (577.355 KB) | DOI: 10.33021/jie.v3i1.495

Abstract

Inventory is one of important factors in manufacturing industry to ensure production process run. This research was conducted in an aluminum ingot manufacture company. The company faces a problem to manage the inventory system for their main raw material. The problem deals with the high expenditure due to safety stock that causes high inventory cost. Total inventory cost based on current condition is $270,706 per year. The proposed improvement method that used in this analysis is continuous review system. This method is applied to determine the appropriate Reorder Point (ROP) and to minimize the inventory cost. Based on the proposed improvement, total inventory cost can be reduced by 30%. This proposed system is also equipped with Decision Support System by using what-if analysis method as the tool to make decision for the next several periods by giving several scenarios and considering the aspects that influence to decision.Keywords: Inventory, Reorder point, Continuous Review System, Decision Support System, What If Analysis, Scenario
Perancangan Kapasitas Produksi Produk Electronic Control Unit (Ecu) Oktavia Sunny; Anastasia Lidya Maukar; Ineu Widaningsih Sosodoro
JIE Scientific Journal on Research and Application of Industrial System Vol 4, No 1 (2019)
Publisher : President University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (563.942 KB) | DOI: 10.33021/jie.v4i1.748

Abstract

The export demand for Electoric Control Unit (ECU) products, which continued to increase by approximately 25% in December 2014, made the company have to review its production capacity. Based on current production capacity data, it is known that the process cycle time is 64.9 seconds while the takt time needed to meet consumer demand is 39.4 seconds for the first production line. With working time included in working hours overtime, this first-line capacity cannot meet production demands. Work measurement is done to get actual time data for capacity calculation. Man machine chart is one of the tools used to determine the production line capacity with the current number of machines and workers. To be able to fulfill the production demand, a capacity design with 2 proposed improvements is carried out, namely: adding a working time of one shift for the first production line or balancing work time between lines. By calculating the results obtained and the costs incurred, the proposal for balancing work time between lines becomes more effective to do.
Co-Authors Anastasia Lidya Maukar Intan Puspita Pribadi Oktavia Sunny Stefanus Setiady