scholarly journals ANALISA PENGENDALIAN PERSEDIAAN PLAT BAJA DENGAN METODE CONTINUOUS REVIEW (Q) DAN PERIODIC REVIEW (P) DI CV. TDSA

2020 ◽  
Vol 15 (1) ◽  
pp. 44-56
Author(s):  
Enny Aryanny ◽  
Faisal Fahmi Fasya
Keyword(s):  
Steel Plate ◽  
Consumer Demand ◽  
Cost Savings ◽  
Retail Trade ◽  
Lost Sales ◽  
Periodic Review ◽  
Inventory Cost ◽  
Continuous Review ◽  
Inventory Costs ◽  
Total Inventory

Persediaan adalah sumber daya yang disimpan untuk memenuhi permintaan saat ini dan mendatang. CV. TDSA merupakan sebuah perusahaan yang bergerak dalam bidang persediaan, perdagangan eceran dan layanan jasa reparasi atau pemeliharaan kapal. Salah satu material metal yang menjadi bahan pembentuk kapal adalah metal jenis plat baja. Perusahaan ini mempunyai permasalahan dalam pengendalian persediaan plat baja yang disebabkan oleh tinggi rendahnya permintaan konsumen yang fluktuatif (probabilistik) sehingga terjadi kekurangan persediaan yang mengakibatkan permintaan konsumen tidak terpenuhi dan kelebihan persediaan yang akan mengakibatkan tingginya biaya persediaan. Tujuan dari penelitian ini adalah melakukan pengendalian persediaan plat baja dengan permintaan yang fluktuatif sehingga dapat meminimumkan biaya persediaan. Pengendalian persediaan dilakukan dengan metode continuous review (Q) dan periodic review (P) lostsales yang akan dibandingkan dengan metode perusahaan dan dipilih metode terbaik dengan total biaya paling minimum. Hasil perhitungan didapatkan total biaya persediaan minimum adalah dengan metode continuous review (Q) lost sales sebesar Rp. 2.024.742.100 dengan metode perusahaan sebesar Rp. 2.264.569.500 sehingga didapatkan penghematan biaya sebesar Rp. 239.827.400 dan efisiensi sebesar 10,59%. Jumlah pemesanan per pesan bulan Oktober 2019 – September 2020, sebesar 11 lbr dengan total biaya persediaan sebesar Rp. 2.421.361.800.   Kata Kunci: Continuous, Periodi Review, Persediaan, Probabilistik.   ABSTRACT Inventories are resources that are stored to meet current and future demand. CV. TDSA is a company engaged in the supply, retail trade and ship repair or maintenance services. One of the metal materials that form a ship is a steel plate type metal. This company has problems in controlling steel plate inventory caused by high and low fluctuating (probabilistic) consumer demand so that there is a shortage of inventory that results in unmet consumer demand and inventory oversight which will result in high inventory costs. The purpose of this study is to control steel plate inventory with fluctuating demand so as to minimize inventory costs. Inventory control is carried out by the continuous review (Q) and periodic review (P) lost sales methods which will be compared with the company method and the best method is chosen with the minimum total cost. The calculation result shows that the minimum total inventory cost is the continuous sales (Q) lost sales method of Rp. 2,024,742,100 with the company method of Rp. 2,264,569,500 so that a cost savings of Rp. 239,827,400 and efficiency of 10.59%. The number of orders per message in October 2019 - September 2020, is 11 lbr with a total inventory cost of Rp. 2,421,361,800.   Keywords: Continuous, Inventory, Period Review, Probabilistic.

scholarly journals Ordering Size Optimization of Raw Material to Minimize Inventory Costs using Wagner-Within Algorithm and Silver-Meal Methods

2021 ◽  
Vol 328 ◽  
pp. 05002
Author(s):  
Dira Ernawati ◽  
Sinta Dewi ◽  
Ni Ketut Sari ◽  
Kurniawan Budianto
Keyword(s):  
Control Method ◽  
Lot Sizing ◽  
Raw Materials ◽  
Cost Savings ◽  
Raw Material ◽  
Inventory Cost ◽  
Cost Overruns ◽  
Inventory Costs ◽  
Total Inventory ◽  
Abc Method

Inventory is one of the current assets that can be classified as company assets. But in reality, inventory often turns into an operational problem that can affect the company's overall performance. This problem occurs due to the incorrect determination of the amount of inventory. Both excess and shortage of inventory can lead to cost overruns. This study applies the Wagner Whitin Algorithm and the Silver-Meal method in the lot-sizing process and the ABC (Always Better Control) method in determining the classification of raw materials at PT. X. Using the ABC method, it is known that the ADC-12 Ingot item has a very significant effect to inventory. Inventory optimization using the Wagner Whitin Algorithm and the Silver-Meal method resulted in the optimal frequency of ordering ADC-12 Ingots is 9 times and the total inventory cost is 994,098,000 IDR as well as inventory cost savings of around 18,403,180 IDR or 1.8% of the cost of existing inventory.

scholarly journals PENGENDALIAN PERSEDIAAN BARANG DAGANG MENGGUNAKAN METODE ECONOMIC ORDER QUANTITY

2021 ◽  
Vol 3 (2) ◽  
Author(s):  
Fanny Andriani Setiawan ◽  
Margarita Ekadjaja ◽  
Yustina Peniyanti
Keyword(s):  
Inventory Management ◽  
Cost Savings ◽  
Economic Order Quantity ◽  
Economic Order ◽  
Cost Calculation ◽  
Order Quantity ◽  
Inventory Cost ◽  
Inventory Costs ◽  
Total Inventory ◽  
The Cost

Inventory control can be done by reducing the cost of inventory and the number of ordering frequencies economically. PT Tanjung Globalindo Utama or Toko TODA is an oil and accessory retail store that provides various oil needs. Some of the problems are late delivery of goods from suppliers, so that for several days the company cannot operate optimally. On the other hand, the company has also experienced an excess inventory of merchandise, so the company wastes due to excess inventory of merchandise which in turn increases inventory costs. The Community Service Team (PKM) provides a solution for TODA Stores in overcoming their problems by providing training in inventory management in the Economic Order Quantity (EOQ) method. PKM activities were carried out on May 22, 2020. Participation of partners in the PKM program is to participate in discussions, provide historical data, and convey targets. The output is that the TODA Shop can determine the amount and schedule for the procurement of merchandise economically. The result is that Toko Toda begins to understand the importance of controlling inventory so that inventory costs are not too high. Proposed procedures for purchasing merchandise inventory were received and started to be carried out with monitoring from the relevant PKM Team. Based on the calculation simulation results and discussion shows that the use of the EOQ method in controlling merchandise inventory at Toda Stores is very efficient, seen from the amount of cost savings obtained if the total inventory cost calculation uses the EOQ methodABSTRAK:Pengendalian persediaan dapat dilakukan dengan menekan biaya persediaan dan jumlah frekwensi pemesanan secara ekonomis. PT Tanjung Globalindo Utama atau Toko TODA adalah Toko retail oli dan aksesori yang menyediakan berbagai kebutuhan oli. Beberapa permasalahan yang sering dialami adalah keterlambatan pengiriman barang dari supplier, sehingga selama beberapa hari perusahaan tidak dapat beroperasi maksimal. Disisi lain perusahaan juga pernah mengalami kelebihan persediaan barang dagang, sehingga perusahaan melakukan pemborosan akibat kelebihan persediaan barang dagang yang pada akhirnya meningkatkan biaya persediaan. Tim Pengabdian Kepada Masyarakat (PKM) memberikan solusi untuk Toko TODA dalam mengatasi permasalahannya dengan memberikan pelatihan tata kelola persediaan metode Economic Order Quantity (EOQ). Kegiatan PKM telah dilaksanakan pada tanggal 22 Mei 2020. Partisipasi mitra dalam program PKM adalah ikut serta dalam berdiskusi, memberikan data-data historikal, dan menyampaikan target yang hendak dicapai. Target luaran dari kegiatan PKM ini adalah Toko TODA dapat menentukan jumlah dan jadwal pengadaan barang dagang secara ekonomis. Hasil kegiatan PKM adalah Toko Toda mulai memahami pentingnya pengendalian persediaan barang dagang agar biaya persediaan tidak terlalu besar. Usulan prosedur pembelian persediaan barang dagang diterima dan mulai dijalankan dengan pemantauan dari Tim PKM terkait. Berdasarkan hasil simulasi perhitungan dan diskusi menunjukkan bahwa penggunaan metode EOQ dalam mengendalikan persediaan barang dagang pada Toko Toda sangatlah efisien terlihat dari besarnya penghematan biaya yang diperoleh jika perhitungan total biaya persediaan menggunakan metode EOQ.

scholarly journals An Optimal Order Quantity Of Spare Parts To Minimize Total Inventory Cost Using Periodic Review Approach (R,s,s) Method In PT. XYZ Bandung

2017 ◽  
Vol 1 (02) ◽  
Author(s):  
Feviana Betsi Purba ◽  
Luciana Andrawina ◽  
Murni Dwi Astuti
Keyword(s):  
Spare Part ◽  
Spare Parts ◽  
Optimal Order ◽  
Periodic Review ◽  
Order Quantity ◽  
Inventory Cost ◽  
Inventory Policy ◽  
Total Saving ◽  
Manufacturing Company ◽  
Total Inventory

The availability of spare parts is very crucial thing for manufacturing company in order to support the continuity of production activities. PT XYZ is a manufacturing company which produces thread into fabric. In this case, inventory control of spare part is not properly managed. Inventory position of spare parts in warehouse is always more than inventory policy of the company itself or called overstock which causes total inventory cost is always high. Company only consider on the order fulfillment of spare parts to prevent downtime on the machine that increase performance of production. Hence, order quantity of spare parts is always excessive or not optimal. In this research, global inventory policy conducted in order to minimize total inventory cost is periodic review approach (R, s, S) method. This inventory policy will be calculated using power approximation and obtained total saving cost of holding cost by 31 % while total saving cost of order cost decreased by 7 %. Overall, total inventory cost minimized by 7 % or equal to Rp138.902.742.

scholarly journals Analisis Pengendalian Persediaan Bahan Baku dengan Menerapkan Metode EOQ (Economic Order Quantity) pada PT. Jatisari Furniture Work

2021 ◽  
Vol 5 (1) ◽  
pp. 215
Author(s):  
Arga Sutrisna ◽  
Rizki Ginanjar ◽  
Suci Putri Lestari
Keyword(s):  
Production Costs ◽  
Raw Material ◽  
Economic Order Quantity ◽  
Economic Order ◽  
Analysis Tool ◽  
Order Quantity ◽  
Inventory Cost ◽  
Total Cost ◽  
Inventory Costs ◽  
Total Inventory

This research objectives aims to determine and analyze raw material inventory control, the ideal raw material inventory that the company must provide and the efficiency of production costs carried out by Jatisri Furniture Work in Tasikmalaya for the period 2018.11 – 2020.02. The data collection method in this study is by direct observation at Jatisari Furniture Work in Tasikmalaya. Using techniques such us interviews, observation, and documentation. These observations were made in production reports for the years 2018 – 2020. The analysis tool was carried out using the Economic Order Quantity (EOQ) method such us safety stock, reorder point, and total inventory cost. The result of the Economic Order Quantity (EOQ) analysis show that the total cost of raw the material inventory that must be incurred by the company is greater than the total cost of inventories calculated according to the EOQ method. Companies should follow the calculations from the EOQ method so that they can save on raw material inventory costs, so that production costs are more efficient.

scholarly journals Simulation-Based Optimization of a Two-Echelon Continuous Review Inventory Model with Lot Size-Dependent Lead Time

Processes ◽  
2020 ◽  
Vol 8 (9) ◽  
pp. 1014
Author(s):  
Ibrahim Alharkan ◽  
Mustafa Saleh ◽  
Mageed Ghaleb ◽  
Abdulsalam Farhan ◽  
Ahmed Badwelan
Keyword(s):  
Supply Chain ◽  
Lead Time ◽  
Shop Floor ◽  
Lot Size ◽  
Continuous Review ◽  
Inventory Costs ◽  
Size Dependent ◽  
Simulation Based ◽  
Simulation Based Optimization ◽  
Total Inventory

This study analyzes a stochastic continuous review inventory system (Q,r) using a simulation-based optimization model. The lead time depends on lot size, unit production time, setup time, and a shop floor factor that represents moving, waiting, and lot size inspection times. A simulation-based model is proposed for optimizing order quantity (Q) and reorder point (r) that minimize the total inventory costs (holding, backlogging, and ordering costs) in a two-echelon supply chain, which consists of two identical retailers, a distributor, and a supplier. The simulation model is created with Arena software and validated using an analytical model. The model is interfaced with the OptQuest optimization tool, which is embedded in the Arena software, to search for the least cost lot sizes and reorder points. The proposed model is designed for general demand distributions that are too complex to be solved analytically. Hence, for the first time, the present study considers the stochastic inventory continuous review policy (Q,r) in a two-echelon supply chain system with lot size-dependent lead time L(Q). An experimental study is conducted, and results are provided to assess the developed model. Results show that the optimized Q and r for different distributions of daily demand are not the same even if the associated total inventory costs are close to each other.

Economic Order Quantity Model for Minimizing Total Inventory Cost at PT PQR in Indonesia

2015 ◽  
Vol 21 (4) ◽  
pp. 1053-1056
Author(s):  
Bachtiar H. Simamora
Keyword(s):  
Economic Order Quantity ◽  
Economic Order ◽  
Order Quantity ◽  
Inventory Cost ◽  
Traditional Practice ◽  
Inventory Costs ◽  
Eoq Model ◽  
Total Inventory

The purpose of this research is to see whether an Economic Order Quantity model can be used to reduce cost of inventory significantly in PT PQR, manufacturer of spring and sponge mattresses in Pekanbaru, Indonesia. The research was conducted on three main materials required in producing spring and sponge mattresses. Using Economic Order Quantity (EOQ) model to analyze historical demand on main materials, it is proven that with EOQ model the company can save by more than 45% from procuring and inventory costs of those materials. The research continues to forecast the sales demand to get the annual requirement of materials needed in 2014 and calculate the EOQ model again. The results show that, comparing with traditional practice done by company, EOQ model can reduce costs up to 118 million rupiah per year.

Review on Inventory Controlling of Building Materials Supply Chain from Uncertainty Demands in Civil Engineering

2012 ◽  
Vol 174-177 ◽  
pp. 3441-3443
Author(s):  
Bin Yang
Keyword(s):  
Supply Chain ◽  
Building Materials ◽  
Simulated Annealing Algorithm ◽  
Supply And Demand ◽  
Cost Models ◽  
Inventory Cost ◽  
Inventory Costs ◽  
Total Inventory ◽  
Annealing Algorithm ◽  
The Difference

Inventory control is a necessary strategy that enterprises use to offset the effect of uncertainties in manufacturing, supply and demand. Normally, probability distribution is used to analyze the uncertainty problems, however, this analysis can’t be completed with inadequate data, resulting in an increase in inventory costs. The paper establishes inventory cost models of single supply chain member under uncertainty demands and applies Simulated Annealing Algorithm to imitate the models in 52 weeks to seek for the optimal speaking for amount and anew speaking for point so that compares the difference of supply chain total inventory cost and the sufficing rate of order for goods between independently and collaborated controlling strategy in supply chain, and in order to provide the necessary theoretical supports for the enterprises to establish supply chain partnerships and possibly improve the supply chain capability of providing external integration.

scholarly journals ANALISA PENGENDALIAN PERSEDIAAN DAUN KAYU PUTIH YANG OPTIMAL DENGAN METODE CONTINOUS REVIEW SYSTEM DI PT. XYZ

2021 ◽  
Vol 16 (1) ◽  
pp. 106-117
Author(s):  
Enny Aryanny ◽  
Ragil Kusuma Jati
Keyword(s):  
Raw Materials ◽  
Raw Material ◽  
Lost Sales ◽  
Continuous Control ◽  
Review System ◽  
Total Cost ◽  
Continuous Review ◽  
Eucalyptus Oil ◽  
Inventory Costs ◽  
Eucalyptus Leaves

Persediaan adalah sumber daya yang perlu diadakan dan dipelihara untuk menunjang kelancaran produksi. PT. XYZ merupakan perusahaan yang bergerak di proses pembuatan minyak kayu putih. Perusahaan memproduksi minyak kayu putih dimana bahan baku utamanya adalah daun kayu putih. Perusahaan ini memiliki permasalahan dalam melakukan pengendalian persediaan bahan baku daun kayu putih yang disebabkan oleh permintaan minyak kayu putih oleh konsumen yang tidak menentu. Perusahaan mengalami keadaan persediaan yang berlebih yang mengakibatkan tingginya biaya persediaan dan kurangnya persediaan yang mengakibatkan produksi yang tidak memenuhi pesanan. Berdasarkan permasalahan di atas, maka dilakukan pengendalian persediaan dengan metode continuous review system backorder dan lost sales. Tujuan dari penelitian ini adalah melakukan pengendalian persediaan daun kayu putih sehingga dapat meminimumkan biaya persediaan. Metode continuous review system backorder dan lost sales akan dibandingkan dengan metode perusahaan dan dipilih metode terbaik dengan total biaya paling minimum. Hasil dari perhitungan diperoleh total biaya persediaan minimum dengan metode continuous review system backorder sebesar Rp 2.459.692.004, sedangkan metode perusahaan sebesar Rp 2.595.684.800, sehingga mendapatkan penghematan biaya sebesar Rp 135.992.796 dengan efisiensi sebesar 5,2%. Jumlah pemesanan bahan baku per pesan bulan November 2019 – Oktober 2020 sebesar 1.812 ton, dengan total biaya persedian bahan baku sebesar Rp 2.544.762.825.   Kata Kunci: Continuous, Pengendalian, Persediaan.   ABSTRACT Inventories are resources that need to be procured and maintained to support the continuity production. PT. XYZ is a company engaged in the process of making eucalyptus oil. The company produces eucalyptus oil where the main raw material is eucalyptus leaves. This company has problems in controlling the supply of raw materials of eucalyptus leaves caused by the erratic demand of eucalyptus oil by consumers. The company experiences a state of excess inventory which results in high inventory costs and lack of inventory resulting in production that does not fulfill orders. Based on the above problems, inventory control is carried out using the continuous review system backorder and lost sales method. The purpose of this study is to control the inventory of eucalyptus leaves so as to minimize inventory costs. The continuous review system backorder and lost sales method will be compared with the company method and the best method is chosen with the minimum total cost. The results of the calculation obtained the minimum total inventory cost with the continuous review system backorder method of Rp.2,459,692,004, while the company's method of Rp2,595,684,800, so as to get a cost savings of Rp.135,992,796 with an efficiency of 5.2%. The number of raw material orders per message in November 2019 - October 2020 amounted to 1,812 tons, with a total cost of supplying raw materials amounting to Rp 2,544,762,825.   Keywords: Continuous, Control, Inventory.

scholarly journals DETERMINATION OF INVENTORY PERIODIC REVIEW POLICY (R, s, S) USING POWER APPROXIMATION METHOD FOR MINIMIZE TOTAL INVENTORY COST IN PT. OPQ

2019 ◽  
Vol 3 (01) ◽  
pp. 47-52
Author(s):  
Ratnawia ◽  
Rio Aurachman ◽  
Saskia Puspa Kenaka
Keyword(s):  
Manufacturing Industry ◽  
Raw Materials ◽  
Service Level ◽  
Raw Material ◽  
Periodic Review ◽  
Inventory Cost ◽  
Automotive Manufacturing ◽  
Power Approximation ◽  
Total Inventory

OPQ is a company engaged in the automotive manufacturing industry. The company produces bolts for the safety area, it is related to the lower body of the four-wheeled vehicle. PT. OPQ was established in 2014 and today has already been the supplier for several major automotive companies in Indonesia. The demand of PT OPQ that must be fulfilled is increasing as the amount of consumer is increasing too. Due to the high demand, so the raw material stockout occurs. This make the company's service level is below the standard.   This study involved 48 sku of material raw materials that have normal distributed demand. Inventory policy applied in this research is periodic review (R, s, S) with the aim to minimize total cost of inventory and improve service level of company.   The result of this research was found to decrease total inventory cost by 15% with the value of existing inventory cost Rp1.100.879.479,- to Rp 936.061.349,- . In addition, service level at PT. OPQ has increased with the value of existing conditions 85% to 99%.   Keywords—Raw Material, Periodic Review, Probabilistic, Service Level, Stock out

scholarly journals ANALISIS KEBIJAKAN INVENTORI PADA KOMPONEN DARAH PACKED RED CELL (PRC)

2019 ◽  
Vol 3 (2) ◽  
pp. 94-105
Author(s):  
Muchammad Fauzi (Universitas Widyatama - Indonesia) ◽  
Senator Nur Bahagia (Institut Teknologi Bandung - Indonesia)
Keyword(s):  
Total Population ◽  
Cost Savings ◽  
Red Cell ◽  
Who Guidelines ◽  
Inventory Cost ◽  
Safety Stock ◽  
Optimal Value ◽  
Total Inventory ◽  
The Cost ◽  
The City

Abstract By following WHO guidelines, the minimum blood availability is 2% of the population. The total population of Indonesia in 2016 is 261.115.456, so ideally it takes 5.222.309 blood bags. In 2013-2015 for 36 months, there were 26 overstock events and 10 stockout events. The data shows that the frequency of over-supply is more frequent than over-demand. The high overstock has an impact on the high costs incurred by the City of Bandung PMI, if there is overstock there are two costs to be incurred, namely the cost of storing if the blood is still in good use and the cost of overstock if the blood is more than the expiration date. The purpose of this study was to determine the optimal value of inventory levels to reduce wastage of blood culling due to overstock occurring at PMI Bandung. The research method uses a quantitative approach to the optimization model of inventory policy, namely Uncertainty EOQ. The optimal amount of supplies that must be provided is at intervals of 8,705 - 9,375 blood bags with a large safety stock 403 blood bags and the ordering point is at the level of supplies of 5.706 blood bags. This proposal can provide a total inventory cost savings of Rp6.622.659.034/year. Keywords: Blood, Overstock, EOQ, Uncertainty Abstrak Sesuai dengan panduan WHO, ketersediaan darah minimal adalah 2% dari jumlah penduduk. Jumlah penduduk Indonesia tahun 2016 adalah 261.115.456 jiwa, maka idealnya dibutuhkan 5.222.309 kantong darah. Tahun 2013-2015 selama 36 bulan, terdapat 26 kejadian overstock dan 10 kejadian stoc-kout. Data tersebut menunjukan bahwa frekuensi over-supply lebih sering dibandingkan over-demand. Tingginya overstock berdampak pada tingginya biaya yang dikeluarkan oleh PMI Kota Bandung, jika terjadi overstock ada dua biaya yang harus dikeluarkan, yaitu biaya simpan jika darah masih dalam masa baik digunakan dan biaya overstock jika darah sudah lebih dari tanggal kadaluarsa. Tujuan penelitian ini adalah mengetahui nilai tingkat persediaan yang optimal untuk mengurangi pemborosan pemusnahan darah akibat overstock yang terjadi di PMI Kota Bandung. Metode penelitian menggunakan pendekatan kuantitatif model optimasi pada kebijakan inventori yaitu EOQ Tak Tentu Berisiko Terkendali. Jumlah persediaan optimal yang harus disediakan berada di interval 8.705 – 9.375 kantong darah dengan besar safety stock 403 kantong darah dan titik pemesanan berada di tingkat persediaan 5.706 kantong darah. Usulan ini dapat memberikan penghematan total biaya persediaan sebesar Rp6.622.659.034/tahun. Kata kunci: Darah, Overstock, EOQ, Tak Tentu

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