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Jurnal Optimasi Sistem Industri

JOSI
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Published by Universitas Andalas

ISSN : 20884842 EISSN : 24428795 DOI : -

Control & Systems Engineering Decision Sciences, Operations Research & Management Engineering Industrial & Manufacturing Engineering Mechanical Engineering

Jurnal Optimasi Sistem Industri (JOSI) is a peer-reviewed journal that is published periodically (April and October) by the Department of Industrial Engineering, Faculty of Engineering, Universitas Andalas, Padang.

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Articles 229 Documents

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Pengukuran Kepuasan Kerja Karyawan APLP & A PT Semen Padang (PT X) Shelly Nolandari; Henmaidi Henmaidi; Alizar Hasan
Jurnal Optimasi Sistem Industri Vol. 14 No. 2 (2015): Published in 1st October 2015
Publisher : The Industrial Engineering Department of Engineering Faculty at Universitas Andalas

Thoughts on employee satisfaction arise because the company believes its employees have a high level of satisfaction will result in a better level of productivity, work more accurate, the fewer the number of absences and higher loyalty than employees with low satisfaction levels.Company's with good productivity will grow and increase revenue. PT Semen Padang has several subsidiaries and affiliates like PT X. PT X will measure employee satisfaction with the company's expectations are always making changes that sustainable about employee satisfaction because companies believe that employee satisfaction level of its high yield levels better productivity, work more accurate, the number of absences are fewer and loyalty higher than employees with low satisfaction levels. Companies with good productivity will experience growth as indicated by the increase in revenue, in line with the increase in the welfare of the employees. PT Semen Padang has several subsidiaries and affiliates PT X. PT Xwill measure employee satisfaction with the Company's expectations.

Pengendalian Kualitas Part Trim Rear Quarter Right APV Arena dengan Menggunakan Metode Six Sigma di PT. Suzuki Indomobil Motor Fatimah Zahara
Jurnal Optimasi Sistem Industri Vol. 13 No. 1 (2014): Published in 1st April 2014
Publisher : The Industrial Engineering Department of Engineering Faculty at Universitas Andalas

Quality is an important aspect in enhancing the competitiveness of the product. Quality's role is to give satisfaction to the customer and be able to compete with similar products. During of the production process there is a chance that the products are not produced in established standards. Products that not suitable with the specifications is a defect that would cause harm to the company. Trim Rear Quarter Right is a component of the APV Arena car which is each production of Trim Rear Quarter Right there are at least one or more defective products. This of course would lead to losses for the company. The method used in this case study is the six sigma method because this method has been proven effective. Defect in Trim Rear Quarter Right caused by five factors that is negligence of the operator in set up the machine, the age of the machine , the quality of the materials, the application of the method is not maximized and noisy environments. The set up process of injection molding machine is the most influential in causing the defect product with RPN (Risk Priority Number) value is 256.Keywords: Quality, Six Sigma,Trim Rear Quarter Right AbstrakKualitas merupakan aspek penting dalam meningkatkan daya saing produk. Perannya adalah memberikan kepuasan kepada pelanggan dan mampu bersaing dengan produk sejenis.Trim Rear Quarter Right merupakan komponen dari mobil APV Arena yangsetiap produksi Trim Rear Quarter Right ini setidaknya terdapat satu atau lebih produk cacat. Hal ini tentunya akan menyebabkan kerugian bagi perusahaan. Metode yang digunakan dalam studi kasus ini yaitu metode six sigma karena metode ini sudah terbukti efektif. acat pada produk Trim Rear Quarter Right disebabkan oleh lima faktor yaitu: kelalaian operator dalam set up mesin , umur mesin, kualitas material, penerapan metode yang belum maksimal dan lingkungan yang berisik. Proses set up molding injection machine adalah proses paling berpengaruh dalam menyebabkan defect produk dengan nilai RPN (Risk Priority Number) sebesar 256.Kata kunci: Kualitas,Six Sigma, Trim Rear Quarter Right

Analisis Sistem Rantai Pasok Minyak Fajri Harisnanda; Ikhlashia Amaly; Alan Mario Gusman; Fulti Febriani; Alwedria Zamer; Wina Elisya
Jurnal Optimasi Sistem Industri Vol. 11 No. 1 (2012): Published in 1st April 2012
Publisher : The Industrial Engineering Department of Engineering Faculty at Universitas Andalas

PT Pertamina is a large company engaged in oil business, non-fuel, gas, petrochemicals and lubricants both in Indonesia and outside Indonesia. Therefore, special attention should be given to the supply chain system that applied this company, because taking into consideration the supply chain, companies can ensure that the resulting product in good condition, transported properly, and ensure that the resulting product arrives in the hands of consumers by the state good also. Moreover, taking into consideration the supply chain, companies can also improve the efficiency and productivity of the enterprise and can increase customer confidence in the company.Keywords: supply chain, efficiency, productivity, distribution

Pengendalian Persediaan Pozzolan di PT Semen Padang Prima Fithri; Annise Sindikia
Jurnal Optimasi Sistem Industri Vol. 13 No. 2 (2014): Published in 1st October 2014
Publisher : The Industrial Engineering Department of Engineering Faculty at Universitas Andalas

Inventory of raw materials is the most important thing to produce the product. Inventory control of the raw materials quantityalso refers to the production process at the factory. PT Semen Padang used raw materials including cement manufacture clay, limestone, silica, gypsum, pozzolan and sand iron or copper slag. Among the raw materials, the most used is pozzolan. This research will be carried out data processing for inventory control using the EOQ (Economic Order Quantity) and POQ (Periodic Order Quantity) to compare with inventory control has been implemented by the company. The data collected for this study include data processing is the use of historical data pozzolan material per period in 2012 and 2013, the cost of raw materials ordering pozzolan, pozzolan storage costs of raw materials and lead time, acceptance of pozzolan from suppliers to storage. Data processing is performed to determine the inventory control of raw materials sand pozzolan in 2014. The results and conclusions obtained are forecasting the use of pozzolan in 2014 is 1.135.355,77 tons it means will be more than in previous years and the inventory control with POQ (Periodic Order Quantity) produces the minimum inventory costs with price Rp 1.775.179.959,61.Keywords: forecasting, inventory, EOQ, POQAbstrakPersediaan bahan baku merupakan elemen terpenting dalam produksi yang dilakukan oleh perusahaan untuk menghasilkan produk. Pengendalian persediaan terhadap kuantitas bahan baku yang dilakukan gudang juga merujuk ke proses produksi yang dilakukan oleh pabrik. Pabrik-pabrik di PT Semen Padang tersebut menggunakan bahan baku pembuatan semen diantaranya tanah liat (clay), batu kapur, batu silika, gypsum, pozzolan dan pasir besi atau copper slag. Diantara bahan baku tersebut, pemakaian terbanyak adalah pemakaian pozzolan. Pada penelitian ini akan dilakukan pengolahan data untuk pengendalian persediaan dengan menggunakan metode EOQ (Economic Order Quantity) dan POQ (Periodic Order Quantity) untuk membandingkan dengan pengendalian persediaan yang telah diterapkan oleh perusahaan. Data yang dikumpulkan untuk pengolahan data penelitian ini diantaranya yaitu data historis pemakaian bahan baku pozzolan per periode pada tahun 2012 dan 2013, biaya pemesanan bahan baku pozzolan, biaya penyimpanan bahan baku pozzolan dan waktu tenggang (lead time) penerimaan pozzolan dari pemasok ke gudang. Pengolahan data yang dilakukan adalah untuk menentukan pengendalian persediaan bahan baku pasir pozzolan di tahun 2014. Hasil dan kesimpulan yang diperoleh adalah peramalan pemakaian pozzolan di tahun 2014 akan lebih banyak dibanding tahun-tahun sebelumnya yaitu dengan total pemakaian sebanyak 1.135.355,77 ton dan pengendalian persediaan dengan metode POQ (PeriodicOrderQuantity) menghasilkan biaya persediaan yang lebih minimum yaitu sebesar Rp 1.775.179.959,61.Kata kunci: peramalan, persediaan, EOQ, POQ

Model Dinamika Sistem Pasokan dan Distribusi pada Gangguan Pendistribusian BBM PT. Pertamina Padang Ivan Ivan
Jurnal Optimasi Sistem Industri Vol. 11 No. 2 (2012): Published in 1st October 2012
Publisher : The Industrial Engineering Department of Engineering Faculty at Universitas Andalas

This paper discusses supply and distribution Bahan Bakar Minyak (BBM) system at PERTAMINA Padang to look a performancy system that disturbance of distribution like replacement Automatic Circuit Breaker (ACB). The replacement of ACB processes about 12 hours and causes the distributing activity of BBM to Stasiun Pengisian Bahan Bakar Umum (SPBU) has to be stopped. It makes impact toward the work ability of supplying and distributing system. Therefore, a planning model which is able to see the impact of ACB replacement toward system behavior of supplying and distributing is needed. Purpose of the modelling is to study the behavioral effects of variable in supply and distribution system using causal loop diagram and stock flow diagram. Result of this diagram has built simulation model to analyze performance system. Verification testing done by the method of checking the level and flow and testing of the coding. Validation of the model while the testing is done by operational graphics and the variability parameter sensitivity analysis. The model was designed and carried out the design of simulated scenarios to determine a strategy for decision-makers to look at the performance of BBM supply and distribution system. Keywords: BBM, supplying, distributing, ACB replacement, dynamic system

Analisis Ketidaksesuaian Produk Air Minum dalam Kemasan di PT Amanah Insanillahia Elita Amrina; Nofriani Fajrah
Jurnal Optimasi Sistem Industri Vol. 14 No. 1 (2015): Published in 1st April 2015
Publisher : The Industrial Engineering Department of Engineering Faculty at Universitas Andalas

Nowadays, the development of industry is increasing very rapidly. It can be known as the high competition between companies. Not only large and international scaled companies, small and medium-sized companies are also facing the same challenges in the global competition. Therefore, the companies need to conduct a quality control to maintain the quality of products produced and to achieve the conformance to specifications of product that has standardized by the company policies in order to improve the customer satisfaction. PT Amanah Insanillahia is a company involved in the bottled water industry. Based on the preliminary study, it shown the quality control only conducted to check the number of defective products produced without further evaluation and analysis. Therefore, there is a need to analyze the data of defective products produced and evaluate the results. The purpose of this study is to analyze the nonconformity product of the bottled water 600 ml brand PRIM-A. The p-chart is used in this research to analyze the number of defective products. Then, the fishbone diagram is used to analyze the causes of defective products. The results show that there is no data out of the control limits and mostly the data near in the central line of the p-chart. Using the fishbone diagram, it concluded that factors of man, machines, materials, methods, and environment are the causes of nonconformity products of the bottled water 600 ml brand PRIM-A. It is hoped this study will beneficial for the company to improve the product quality as well as to increase the customer satisfaction.

Perancangan Sistem Informasi pada Bagian Gudang PT. PN VI Unit Usaha Ophir Dina Rahmayanti; Ringgo Afrinando
Jurnal Optimasi Sistem Industri Vol. 12 No. 2 (2013): Published in 1st October 2013
Publisher : The Industrial Engineering Department of Engineering Faculty at Universitas Andalas

Sistem Informasi adalah sistem buatan manusia yang terdiri dari komponen-komponen dalam organisasi untuk dapat menyajikan informasi . Sebuah sistem informasi yang baik dapat meningkatkan kinerja dari semua kegiatan dalam perusahaan yang didukung oleh data yang akurat dan lebih aman , sehingga semua kegiatan dapat berjalan lebih efektif. PTPN 6 Satuan Usaha Ophir adalah salah satu perusahaan yang bekerja di industri manufaktur pengolahan minyak sawit . Salah satu bagian dari perusahaan ini yang penting adalah penyimpanan . Hal ini penting di gudang adalah pencatatan data barang yang ada . Dalam bagian ini ada sistem yang kurang baik dimana pencatatan data secara manual sehingga dapat mempengaruhi munculnya kesalahan . Oleh karena itu, dibutuhkan perancangan suatu sistem informasi item data sehingga waktu yang dibutuhkan untuk mencari data tidak panjang dan menyederhanakan aliran informasi. Perancangan sistem informasi ini melalui beberapa tahapan dimulai dengan survei pada perusahaan , masalah identifikasi , analisis sistem , desain model menggunakan UML dan akhirnya dengan merancang sistem informasi dengan menggunakan database dan aplikasi dengan PHP – MySQLKata Kunci: Departemen Penyimpanan, Sistem Informasi, UML Diagram

Model Penentuan Ukuran Batch Produksi dan Bufferstock untuk Sistem Produksi Mengalami Penurunan Kinerja dengan Mempertimbangkan Perubahan Order Awal Ivan D Wangsa
Jurnal Optimasi Sistem Industri Vol. 14 No. 2 (2015): Published in 1st October 2015
Publisher : The Industrial Engineering Department of Engineering Faculty at Universitas Andalas

This study develops a model that involves information the preliminary order. At first, the manufacturer provides the preliminary order for the coming week (five days) varies from day to day and is received on Friday. Change in the preliminary order for a given day is announced one day before and this is viewed as it occurs randomly. Moreover, production systems experience performance degradation (deterioration). Status of the production process shifts from in control to out of control that is identified by the last inspection. Inspection is done by sampling. At the time of the status of out of control the probability of producing non-conforming system component that is charged to the restoration cost and warranty costs.This paper is looking for a solution for determining the production batch size and the buffer stock to reduce total cost. The decision variables are production run period (T) and buffer factor (m). Having obtained the variables T and m, then the variable production batch size (QT) and the buffer stock (BT) can be determined sequentially. Heuristic methods used are Silver-Meal (SM) and Least Unit Cost (LUC) to obtain a solution for each model. Numerical examples are given to demonstrate the performance of the models. From the numerical results, it appears that LUC method is better than SM method.

Evaluasi Kinerja Pemeliharaan PLTA dengan Pendekatan Maintenance Scorecard dan Objective Matrix (OMAX) (Studi Kasus Unit Pembangkit Listrik Tenaga Air Maninjau) Taufik Taufik; Afrizal Afrizal
Jurnal Optimasi Sistem Industri Vol. 13 No. 1 (2014): Published in 1st April 2014
Publisher : The Industrial Engineering Department of Engineering Faculty at Universitas Andalas

Hydropower is one of the power plants that supplies electrical energy. It has several machines and equipment that have a time limit of use. To anticipate the limitation of the use, maintenance of machinery and equipment are needed in order to return its original state and can perform its function as usual. Therefore some indicators required to determine maintenance work performance level to provide the optimal results. The Traditional measurement methods have some limitations that make it difficult to implement in industrial environments. This requires a performance measurement method that can provide a balanced perspective on the overall system performance. One of them is implementing the Maintenance Scorecard and Objective Matrix (OMAX) method to assess the performance of hydropower maintenance. Objective research in this assessment is to integrate Maintenance Scorecard and Objective Matrix (OMAX) approach in Maninjau Hydropower. Key Performance Indicators (KPI) are defined by 6 perspectives: productivity perspective, cost effectiveness perspective, a safety perspective, an environmental perspective, quality perspective and learning perspective. The priorities are determined by using Analytical Hierarchy Process (AHP). We then measure the performance of maintenance by using Objective Matrix (OMAX) until we get the level of achievement of the performance in the current situation.The results obtained in the process of designing the scorecard maintenance on the Maninjau hydropower that produces overall 20 KPI consists of 9 KPI for productivity perspective, 4 KPI for quality perspective, 2 KPI for safety perspective, 2 KPI for environmental perspective and 3 KPIs for learning perspective. There are 5 KPIs for corporate level, 8 KPIs for strategic level and 7 KPIs functional level. The operation results show the number of KWH that produced, Capacity Factor and Equivalent Outage Force Factor are in the yellow zone. It means the attentions and improvements are needed to improve performance in the next period.Keywords: Maintenance Scorecard, Analitycal Hierarchy Process, Objective MatrixAbstractPembangkit Listrik Tenaga Air (PLTA) merupakan salah satu jenis pembangkit listrik. Pembangkit tersebut memiliki serangkaian mesin dan peralatan yang memiliki umur pemakaian tertentu. Sebagai langkah antisipasi terhadap habisnya umur pakai tersebut, diperlukan kegiatan perawatan untuk mengembalikan kondisi mesin dan peralatan sehingga bisa menjalankan fungsinya dengan lancar. Beberapa indikator dibutuhkan untuk menentukan tingkat kinerja aktivitas perawatan agar kegiatan perawatan yang dilakukan dapat memberikan hasil yang optimal. Metode pengukuran tradisional memiliki keterbatasan yang menjadikannya sulit diimplementasikan dalam lingkungan industri. Oleh karena itu dibutuhkan metode pengukuran performansi yang dapat melakukan penilaian dari berbagai perspektif secara seimbang terhadap kinerja sistem secara keseluruhan. Salah satu caranya adalah dengan menerapkan metode Maintenance Scorecard dan Objective Matrix (OMAX) untuk menilai kinerja perawatan PLTA. Tujuan penelitian dalam penilaian ini adalah untuk mengintegrasikan pendekatan Maintenance Scorecard dan OMAX pada PLTA Maninjau. Key Performance Indicators (KPI) didefinisikan dari 6 perspektif: perspektif produktivitas, perspektif efektifitas biaya, perspektif keselamatan kerja, perspektif lingkungan, perspektif kualitas dan perspektif pembelajaran. Prioritas ditentukan menggunakan Analytical Hierarchy Process (AHP). Kinerja perawatan kemudian diukur menggunakan OMAX sampai diperoleh tingkat kinerja pada kondisi nyata. Hasil yang diperoleh kemudian digunakan untuk merancang maintenance scorecard bagi PLTA Maninjau, menghasilkan 20 KPI yang terdiri atas 9 KPI untuk perspektif produktivitas, 4 KPI untuk perspektif kualitas, 2 KPI untuk perspektif keselamatan kerja, 2 KPI untuk perspektif lingkungan dan 3 KPI untuk perspektif pembelajaran. Terdapat 5 KPI untuk level korporat, 8 KPI untuk level strategis dan 7 KPI untuk level fungsional. Hasil penilaian menunjukkan bahwa Jumlah KWH yang diproduksi, Faktor kapasitas dan Equivalent Outage Force Factor berada pada zona kuning. Hal ini berarti bahwa dibutuhkan perhatian dan peningkatan untuk periode selanjutnya.Kata Kunci: Maintenance Scorecard, Analitycal Hierarchy Process, Objective Matrix

Perancangan Model Pengukuran Kinerja Rantai Pasok Berbasis Lean dan Green menggunakan Balance Scorecard di PT. P&P Lembah Karet Alizar Hasan; Berry Yuliandra; Eureka Perdana Putra
Jurnal Optimasi Sistem Industri Vol. 15 No. 1 (2016): Published in March 2016
Publisher : The Industrial Engineering Department of Engineering Faculty at Universitas Andalas

Rapid technological developments helped bring an increase in the level of business competition. Competitive business strategies required to address the challenges of business competition. PT P&P Lembah Karet is a company engaged in the plantation and crumb rubber processing industry. Marketing area is scattered inside and outside the country led to the supply chain performance become one of the important issues in the company. The use of Lean and Green concept in the supply chain system can become a competitive advantage for PT. P&P Lembah Karet to create a more effective and efficient supply chain strategy in terms of expenditure and environmental impact. Performance measurement is required to determine the effectiveness and efficiency of these two concepts implementation in the supply chain companies.Performance measurement system was developed based on four perspectives of the Balanced Scorecard (BSC): financial, customer, internal business processes, learning and growth. Key Performance Indicator (KPI) which is used as a measurement basis is formulated through the concept of lean and green. The weight value of each KPI is determined using Analytical Hierarchy Process (AHP) with relevant experts as respondents. Respondents selected based on the experience and knowledge, especially experience and knowledge that relevant with the topic of this research. The weight value determined the order of KPI priority. Face validity is used to validate the performance measurement model. Data processing and analysis yielded 25 lean and green-based KPIs that are relevant to crumb rubber supply chain at PT. P&P Lembah Karet with 3 KPI for financial perspective, 4 KPI for customer perspective, 11 KPI for internal business process perspective and 7 KPI for learning and growth perspective. The structure of designed models showed that customer perspective is the most priority aspects.

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