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All Journal JURNAL PASTI (PENELITIAN DAN APLIKASI SISTEM DAN TEKNIK INDUSTRI) Teknika: Jurnal Sains dan Teknologi JOURNAL OF INDUSTRIAL AND MANUFACTURE ENGINEERING Jurnal Teknik Industri : Jurnal Hasil Penelitian dan Karya Ilmiah dalam Bidang Teknik Industri INTECOMS: Journal of Information Technology and Computer Science Industri Inovatif : Jurnal Teknik Industri G-Tech : Jurnal Teknologi Terapan
Wahyuda Wahyuda
Prodi Teknik Industri, Fakultas Teknik, Universitas Mulawarman
Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Transportation

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Journal : Teknika: Jurnal Sains dan Teknologi

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Inventory management of 50 kg packaged cement products with a lot sizing ratio (case study: XYZ warehouse) Annisa Sherina Rahmadhani Hasibuan; Wahyuda Wahyuda; Farida Djumiati Sitania
Jurnal Teknika Vol 17, No 2 (2021): Available Online in November 2021
Publisher : Faculty of Engineering, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/tjst.v17i2.12684

Abstract

XYZ is a trading and shipping company for building needs. The problem experienced by XYZ Warehouse is the high demand for Conch 50 kg cement products without being balanced with good inventory management so that companies often experience shortages and excess supplies which can increase inventory costs. Therefore, good inventory planning and control are needed to make the costs incurred is more optimal. The model used in this study is the Economic Order Quantity (EOQ) model by calculating safety stock and reorder points to avoid demand uncertainty. Before calculating the inventory model, forecasting was done using the Moving Average 6 method as the chosen method with MAD 4,712,852, MSE 37,283,346,809, and MAPE 15.502%. Based on the calculation results, the optimal order quantity was 1,868, safety stock was 185, and reorder point was 1,320. Other than that, the lot-sizing technique was also carried out using the EOQ, LFL, POQ, and Silver Meal methods. Based on the calculation result, the lot-sizing technique that provides a minimum total cost was the LFL method with a total cost of Rp. 1,430,406.61 and savings up to 77.04%, followed by the EOQ method with a total cost of Rp. 1,918,668.55 and savings up to 69.21%. Also, the POQ and Silver Meal method with a total cost of Rp. 2,106,571.61 and savings up to 66.19%. PT. XYZ merupakan perusahaan yang beroperasi dalam sektor perdagangan barang dan jasa pengiriman untuk keperluan bahan bangunan. Permasalahan yang dihadapi Gudang XYZ adalah tingginya permintaan produk Semen Conch 50 kg tanpa diimbangi pengelolaan persediaan yang baik sehingga kerap mengalami kekurangan maupun kelebihan persediaan di mana hal tersebut dapat meningkatkan biaya persediaan. Oleh karena itu, dibutuhkan suatu perencanaan dan pengelolaan persediaan yang baik sehingga biaya yang dikeluarkan pun lebih optimal. Model yang dimanfaatkan dalam penelitian ini adalah model economic order quantity (EOQ) dengan memperhitungkan safety stock dan reorder point untuk menghindari ketidakpastian permintaan. Sebelum dilakukan perhitungan model persediaan, terlebih dahulu dilakukan peramalan dengan metode moving average 6 sebagai metode terpilih dengan MAD 4.712,852, MSE 37.283.346,809, MAPE 15,502%. Berdasarkan hasil perhitungan model EOQ, diperoleh Q optimal sebanyak 1.868 sak, safety stock 185 sak, dan reorder point 1.320 sak. Selain itu, dilakukan pula lot sizing dengan metode EOQ, LFL, POQ, dan Silver Meal. Berdasarkan hasil perhitungan, lot sizing  yang memberikan total biaya minimum adalah LFL dengan total biaya sebesar Rp. 1.430.406,61 dan penghematan mencapai 77,04%, kemudian diikuti oleh EOQ dengan total biaya sebesar Rp. 1.918.668,55 dan penghematan mencapai 69,21%, dan POQ serta Silver Meal dengan total biaya sebesar Rp. 2.106.571,61 dan penghematan mencapai 66,19%.
Analysis and determination of tofu production risk mitigation strategy using FMEA and AHP methods (Case study: UD XYZ) Anisa Dwi Aryani; Wahyuda Wahyuda; Suwardi Gunawan
Jurnal Teknika Vol 18, No 1 (2022): Available Online in June 2022
Publisher : Faculty of Engineering, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/tjst.v18i1.13809

Abstract

In the tofu production process, UD XYZ is inseparable from the risks that may occur so that it can interfere with tofu production activities. Therefore, to handle the existing risks, it is necessary to carry out risk management by mitigating risks. Data collection techniques used are secondary data and primary data. The data processing technique and data analysis used the Failure Mode Effect Analysis (FMEA) method and the Analytical Hierarchy Process (AHP) method. The results of data processing using the FMEA method are known to be risk factors for raw materials with the highest RPN value, namely the risk of poor soybean quality with an RPN value of 720, the risk factor for the highest RPN production process is the risk of the dose of supporting raw materials not in accordance with the RPN value of 320, and the highest RPN finished product risk factor is the risk of damaged tofu when packaged with an RPN value of 36. The results of data processing using the AHP method with the help of Benefit, Cost, Opportunities, and Risk (BCOR) criteria are known that the criteria with values the highest is the benefit criteria with a value of 0.600. In the risk of raw materials, namely the quality of soybeans is not good, it is known that the chosen alternative strategy is to use the best raw material supplier with a value of 0.738. In the risk of the production process, namely the dose of supporting raw materials is not appropriate, it is known that the chosen alternative strategy is to make a Standard Operating Procedure (SOP) with a value of 0.671. The existence of SOPs will help to achieve goals because of the design that guides employees in carrying out their duties and to minimize errors when carrying out their respective tasks. Dalam proses produksi tahu, UD XYZ tidak terlepas dari risiko-risiko yang mungkin terjadi sehingga dapat mengganggu aktivitas produksi tahu. Oleh karena itu, untuk menangani risiko yang ada maka perlu dilakukan manajemen risiko dengan memitigasi risiko. Teknik pengumpulan data yang digunakan adalah data sekunder dan data primer. Teknik pengolahan data dan analisis data menggunakan metode Failure Mode Effect Analysis (FMEA) dan metode Analytical Hierarchy Process (AHP). Hasil pengolahan data menggunakan metode FMEA diketahui pada faktor risiko bahan baku risiko dengan nilai RPN tertinggi yaitu pada risiko kualitas kedelai tidak baik dengan nilai RPN sebesar 720, pada faktor risiko proses produksi RPN tertinggi yaitu pada risiko takaran bahan baku pendukung tidak sesuai dengan nilai RPN sebesar 320, dan pada faktor risiko produk jadi RPN tertinggi yaitu pada risiko tahu rusak saat dikemas dengan nilai RPN sebesar 36. Hasil pengolahan data menggunakan metode AHP dengan bantuan kriteria Benefit, Cost, Opportunities, dan Risk (BCOR) diketahui bahwa kriteria dengan nilai-nilai tertinggi yaitu pada kriteria benefit dengan nilai 0.600. Pada risiko bahan baku yaitu kualitas kedelai tidak baik, diketahui bahwa alternatif strategi terpilih adalah menggunakan supplier bahan baku terbaik dengan nilai 0.738. Pada risiko proses produksi yaitu takaran bahan baku pendukung tidak sesuai, diketahui bahwa alternatif strategi terpilih adalah membuat Standar Operasional Prosedur (SOP) dengan nilai 0.671. Dengan adanya SOP dan pemilihan supplier bahan baku terbaik akan membantu memitigasi risiko prioritas sehingga risiko tersebut dapat dikendalikan dan frekuensinya berkurang.
Co-Authors Anggriani Profita Anisa Dwi Aryani Annisa Sherina Rahmadhani Hasibuan Chlarasati Veronica Dhimas Saifullah Dutho Suh Utomo Farida Djumiati Sitania Khalid Jundi Rabbani Nanditha Aiswarya Khan Nurul Hasanah Rahul Ihza Mahendra Resky Mubarog Siti Nur Afifah Rahmania Suwardi Gunawan Yudi Sukmono, Yudi