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All Journal Jurnal Optimasi Sistem Industri
Suci Rahmawati SY
Jurusan Teknik Industri, Fakultas Teknik,Andalas University
Control & Systems Engineering Decision Sciences, Operations Research & Management Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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Analisis Perhitungan Biaya Penambangan Batu Silika Pada Departemen Tambang PT Semen Padang Suci Rahmawati SY
Jurnal Optimasi Sistem Industri Vol. 10 No. 1 (2011): Published in April 2011
Publisher : The Industrial Engineering Department of Engineering Faculty at Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/josi.v10.n1.p93-104.2011

Abstract

Cement manufacturing is consisting of four components that are limestone with the percent composition of 70%, iron sand 10%, silica 10%, and clay 10%. Source of major raw materials for cement production in PT Semen Padang are limestone and silica. The mining process is involving various costs such as direct costs, indirect costs, overhead costs, etc. Therefore, cost calculations needed to determine the selling price of produced silica. In calculating the cost of production considered various aspects, such as operating costs, material costs, labor costs. So that, it can determine cost of goods production. The research objective is calculating cost of goods manufacturing the silica. Benefit of the research for PT Semen Padang is describing cost of goods production in determining cost of goods sold. Cost of goods production that resulted for silica mining is IDR 58.000 per ton, while internal price of silica is IDR 53.851 per ton. Research result is show that there is difference between results based on Full costing method with current price. This shows that several other factors is necessary considered in calculating the cost of goods production.
Analisis Penyimpanan dan Pengeluaran Bahan Curah PT. Semen Padang Suci Rahmawati SY
Jurnal Optimasi Sistem Industri Vol. 10 No. 1 (2011): Published in April 2011
Publisher : The Industrial Engineering Department of Engineering Faculty at Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/josi.v10.n1.p127-133.2011

Abstract

Inventory are assets of a company. If the inventory control of a company is not good then the company will incur a loss, if a company's inventory control both the Performance Management will benefit. Inventory control is one of them can be done by looking at inventory turnover (ITO). Since inventory is a very important thing to do design a model that can be used as an alternative to using the approach Economic Production Quantity (EPQ). Inventory control can be done in a way determine the number of requests a year to do the calculations for the current conditions in the ITO. then performed 12 period ahead forecasting using linear, quadratic, exponential, cyclical, and cyclical trends, the Standard Error of Estimate (SEE) the smallest of each method obtained the number of requests made after that period 12 calculations Economic Production Quantity (EPQ ) to get the optimum amount of inventory as well as ITO calculations performed for the optimum amount of inventory.Based on calculations obtained ITO current state of the low of 0.010, while the ITO using EPQ is 0.230. Concluded that the inventory control for coal by using the method of generating EPQ inventory turnover is better than the methods currently used by the company.
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