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Jurnal Optimasi Sistem Industri
Published by Universitas Andalas
ISSN : 20884842     EISSN : 24428795     DOI : -
Core Subject : Science, Engineering,
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.
Arjuna Subject : -
Articles 394 Documents
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Evaluasi Kinerja Pemeliharaan PLTA dengan Pendekatan Maintenance Scorecard dan Objective Matrix (OMAX) (Studi Kasus Unit Pembangkit Listrik Tenaga Air Maninjau) Taufik; Afrizal
Jurnal Optimasi Sistem Industri Vol. 13 No. 1 (2014): Published in April 2014
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.v13.n1.p562-575.2014

Abstract

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.
Formulasi Nilai Tambah pada Rantai Pasok Minyak Sawit Syarif Hidayat; Nunung Nurhasanah; Rizki Ayuning Prasongko
Jurnal Optimasi Sistem Industri Vol. 13 No. 1 (2014): Published in April 2014
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.v13.n1.p576-587.2014

Abstract

In palm oil supply chain (POSC) the smallholder farmers sell their fresh fruit bunch (FFB) to Palm Oil Mills through traders. Palm Oil Mills convert the FFB into crude palm oil (CPO). CPO is sold to the refinery, who converts CPO into frying oil and sends the product to the distributors. The distributors subsequently sell them to the consumers. Each member of the POSC will try to optimize its added value. The aim of this paper is to develop an added value formulation as a function of risk, investment and technology levels of each of the POSC member. To facilitate fair distribution of rewards a concept of added value utility based on rsk, investment and technology level was introduced. To optimize the added value distribution between the members the concept of stakeholder dialogue was used. The selling prices were negotiated between the actors until each reached a satisfactory value, which was ruled by the levels of optimum added value utility. This research is important because the developed model can facilitate a better formula to calculate the fair distribution of added values, therefore ensure its sustainability and improve the total supply chain added value.
Perencanaan & Penjadwalan Distribusi Pakaian Jadi dengan Metode Distribution Resource Planning Syarif Hidayat; Nunung Nurhasanah; Anela Septieni Zulkifli
Jurnal Optimasi Sistem Industri Vol. 12 No. 2 (2013): Published in October 2013
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.v12.n2.p343-351.2013

Abstract

The tight competition in the business world nowadays, especially after the signing of AFTA and ACFTA agreements calls for an increased competitiveness of domestic industries especially the garment industries. High quality products, competitive prices and the availability of products in the ever changing fashion market are the key factors to win the competition.Distribution is one of the important activities as it is directly related to fulfilling customer needs. Right products must be available in the right quantity and right condition and at the right time. Product availability in the market should be strong to prevent lost sales. However, a high service level means high inventory costs. Companies need tool to manage their inventory.This research proposes the planning and scheduling of distribution at XYZ using the Distribution Resource Planning (DRP) for product X102 for five selected distributors (Surabaya, Bogor, Pekalongan, Sidoarjo and Probolinggo) using the Exponential Comparison Method (ECM). The DRP results show that XYZ must issue production orders in the 3rd, 5th, 7th periods for X102 in the amount of 150 units. In addition to the DRP, to help the company controls the inventory level, the researchers developed a model of Excess Stock Management system using Dev C++.
Model Pemilihan Pemasok Bahan Baku Kelapa Parut Kering dengan Metode AHP (Studi Kasus PT. Kokonako Indonesia) Siti Wardah
Jurnal Optimasi Sistem Industri Vol. 12 No. 2 (2013): Published in October 2013
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.v12.n2.p352-357.2013

Abstract

The selection of suppliers is a strategic activity, especially if the supplier will supply critical items and/ or will be used in the long term. Many factors need to be considered in the selection of suppliers. PT. Kokonako Indonesia is one of the companies of the Group are located in Medan Capella. There are weaknesses in the selection of suppliers conducted by PT. Indonesia Kokonako the decision maker for the purchase of raw materials which are not within specification diameter ≥ 10 cm. Therefore, this study aims to perform the selection of suppliers with the consideration of a more comprehensive and objective as needed. The first stage is carried out in order to represent the actual circumstances is to identify the criteria, sub-criteria, and alternatives that will be used in the selection of suppliers. There are 6 criteria, 13 subcriteria, and 4 alternatives used in the selection of suppliers for raw materials dried grated coconut. The second stage, the stage determines the method for the selection of suppliers. Based on the identification there are no dependencies between sub criteria. Therefore, the exact method used to determine the priority of suppliers to be selected is the method of analytical hierarchy process (AHP). By using the AHP, the priorities selected suppliers for raw materials are dried grated coconut and weighs 0.363 Tempuling District as a top priority. Followed by Sub Tembilahan with weights 0.268, third priority is the District Enoch with weights 0.213, and the last is the Sub Trunk Tuaka and weighs 0,157.
Audit Efisiensi pada Proses Produksi Minuman Ringan di PT Coca Cola Bottling Indonesia (CCBI) Central Sumatera Alizar Hasan; Morena Tantilia
Jurnal Optimasi Sistem Industri Vol. 12 No. 2 (2013): Published in October 2013
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.v12.n2.p358-368.2013

Abstract

Efisiensi menjadi salah satu faktor pencapaian produktivitas suatu perusahaan, baik dari segi bahan baku, kualitas, peralatan, serta kepedulian terhadap lingkungan. Sebagai perusahaan satu-satunya yang menjalankan proses pembotolan dan distribusi produk minuman ringan ternama di bagian Sumatera Tengah, PT Coca Cola Bottling Indonesia Central Sumatera selalu berupaya meningkatkan produktivitas produksi, sehingga kinerja perusahaan dapat terus dipertahankan. Melalui penelitian ini, dilakukan audit dan evaluasi terhadap kinerja efisiensi proses produksi minuman ringan di PT Coca Cola Bottling Indonesia Central Sumatera dengan tahapan melakukan pengukuran terhadap efisiensi proses produksi dengan menggunakan 12 indikator Barbiroli secara teknis dan ekonomis. Selain itu, juga dilakukan penentuan status efisiensi proses produksi berdasarkan penilaian pakar secara kualitatif. Sebagai upaya peningkatan efisiensi, direkomendasikan beberapa alternatif perbaikan melalui penentuan prioritas dengan menggunakan Analytical Hierarchy Process.Hasil penelitian menjelaskan bahwa efisiensi teknis proses produksi minuman ringan Frestea Jasmine adalah sebesar 91.58 % yang digolongkan pada tingkatan tinggi sedangkan efisiensi ekonomis adalah sebesar 24.33 % yang digolongkan pada tingkatan sedang. Namun, berdasarkan penilaian tiga orang pakar secara kualitatif, status tingkat efisiensi proses produksi secara teknis berada pada tingkat sedang (medium) dan secara ekonomis berada pada tingkat rendah. Pemilihan alternatif perbaikan dengan Analytical Hierarchy Process menunjukkan bahwa prioritas perbaikan untuk peningkatan efisiensi adalah memperbaiki sistem perawatan mesin produksi dengan bobot 0.476, memperbaiki metode inspeksi proses pembotolan produk dengan bobot 0.293, dan memaksimalkan penggunaan bahan baku produksi dengan bobot 0.231. Dengan demikian, perbaikan terhadap sistem perawatan mesin produksi diharapkan mampu meningkatkan efisiensi proses produksi PT Coca Cola Bottling Indonesia, khususnya untuk minuman jenis Frestea Jasmine, karena penanganan sistem perawatan mesin yang baik berkaitan dengan optimalisasi penggunaan bahan baku, kapasitas produksi, kualitas produk yang dihasilkan, serta biaya produksi.
Penjadwalan Mesin dengan Menggunakan Algoritma Pembangkitan Jadwal Aktif dan Algoritma Penjadwalan Non-Delay untuk Produk Hydrotiller dan Hammermil pada CV. Cherry Sarana Agro Prima Fithri; Fitri Ramawinta
Jurnal Optimasi Sistem Industri Vol. 12 No. 2 (2013): Published in October 2013
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.v12.n2.p377-399.2013

Abstract

Fulfillment of all demands of consumers who come to the product is one thing that always wanted to be achieved by a company. These requests are not independent of the company's ability to manufacture certain products. CV Cherry Sarana Agro manufactures a wide range of agricultural equipment, one of which is the product hydrotiller and hammermil. Demand for both products are always in large numbers for each period, however, the company could not meet the entire demand. One of the main factors that led this small company's production capacity for these two products is not optimal scheduling of machines made by companies, causing many to be a queue on a particular machine so that the total process operating time becomes very large. Scheduling method is used to optimize the scheduling of machines working on the report of this practice is actively scheduling method and the method of non-delay scheduling. The data needed to perform scheduling with both of these methods is the data used machines, data processing operations and data processing time of operation. With these three data, can be compared to the actual scheduling done by the company with the scheduling is done using active scheduling method and the method of non-delay scheduling. The most optimal scheduling is obtained after comparing the three methods used are scheduling using the non-delay scheduling. This method was chosen because the resulting make span is much smaller than the two other methods. This method is well applied in the company because in addition to reducing the total processing time, can also increase production capacity, so that all requests can be met.
Perbaikan Rancangan Kruk Ketiak untuk Penderita Cedera dan Cacat Kaki Alfadhlani; Yumi Meuthia; Dolly Filius Valent
Jurnal Optimasi Sistem Industri Vol. 12 No. 2 (2013): Published in October 2013
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.v12.n2.p400-410.2013

Abstract

Kruk merupakan tongkat/alat bantu berjalan untuk orang yang memiliki keterbatasan fisik karena cacat atau cedera, biasanya digunakan secara berpasangan untuk mengatur keseimbangan tubuh saat berjalan. Kruk biasanya terdiri dari dua jenis yaitu kruk ketiak (Axillary Crutch) dan kruk lengan bawah (Forearm Crutch). Kruk ketiak pada umumnya terbuat dari aluminium karena berat jenisnya yang relatif ringan, namun memiliki kekuatan mekanik yang relatif rendah, sehingga pada beberapa kasus kruk aluminium mengalami bengkok saat digunakan. Kruk ketiak yang diusulkan oleh [1] dan [2] kurang praktis untuk dibawa, penutup kruk yang licin dan mudah rusak, serta ketinggiannya yang tidak mudah diatur sesuai keinginan. Pada makalah ini dilakukan studi untuk mengusulkan alternatif material pengganti yang lebih kuat dan sekaligus mengatasi masalah kekurangan kruk yang diusulkan oleh peneliti sebelumnya. Material yang dipertimbangkan dalam kajian adalah aluminium, baja karbon, dan stainless steel. Material terpilih untuk diusulkan sebagai material pengganti adalah stainless steel, penggunaan material ini dapat mereduksi bobot kruk sebanyak 28,6% dari 1,75 kg menjadi 1,25 kg. Agar kruk praktis dibawa, diusulkan sistem geser dengan tiga komponen penyusun utama yaitu tiang penyesuai jangkauan, tiang utama dan tiang penyesuai ketinggian, dengan sistem ini kruk memiliki panjang yang bisa disesuaikan yaitu panjang minimal 100 cm dan panjang maksimal 150 cm. Tiang utama kruk dibagi menjadi dua bagian, panjang masing-masing tiang utama adalah 50 cm dan 45 cm sehingga lebih mudah dilipat untuk disimpan dan dibawa. Penutup ujung kruk menggunakan karet agar tidak licin, karet tersebut dimasukkan ke dalam pipa tiang utama sehigga lebih tahan terhadap tekanan. Pegangan kruk dirancang dengan kemiringan yang bisa disesuaikan, rasio penyesuaian kemiringan yaitu 14,4o agar posisi tangan dan pergelangan tangan lebih baik dan nyaman saat penggunaan, tetapi derajat kemiringan kruk rancangan ini masih lebih besar 2,4o jika dibandingkan dengan kemiringan yang ergonomis yaitu sebesar 12o.
Pengembangan Kualitas Pelayanan Produk Telekomunikasi Selular Diatas Kapal Menggunakan Metode Service Quality & Quality Function Deployment Maya Arlini Puspasari; Nia Kurniasih
Jurnal Optimasi Sistem Industri Vol. 12 No. 1 (2013): Published in April 2013
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.v12.n1.p293-300.2013

Abstract

The need for telecommunications, including the category of primary need for the people of Indonesia, one of the important aspects that need to be considered by the telecommunications company is a technological innovation that can cover all of Indonesia to outlying places, not only telecommunications on land even when in the middle of the ocean though. With Cellular Telecommunications Company cooperation to support the availability of telemetry, then develop into the greatest benefit is the availability of the Mobile phone network for the passengers on board, to continue to innovate and deliver the best to customers, the service providers must continue to improve quality. Research conducted using the SERVQUAL method to measure the quality of service based on the five dimensions of service quality by analyzing gaps that occurs due to a mismatch between customer expectations and perceptions of the quality of service received. In this study wants and expectations of consumers translated into House of Quality in Quality Function Deployment. Results of research propose using strategy value to get priority repairs according to the company's ability
Analisis Kepuasan Konsumen Terhadap Kualitas Pelayanan dan Harga Produk pada Supermarket dengan Menggunakan Metode Importance Performance Analysis (IPA) Melfa Yola; Duwi Budianto
Jurnal Optimasi Sistem Industri Vol. 12 No. 1 (2013): Published in April 2013
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.v12.n1.p301-309.2013

Abstract

Currently, the number of retail companies grow rapidly. This condition make high level competition between retailing in Indonesia and each of company need to have effective strategy to survive in retail business. Beside, a number of big company also take opportunity to expand retail business, not only into big size category (e.q. Hypermarket) but also into small size such as mini market. It can be big challenges for Small Medium Enterprise to handle this situation. The Objective of this paper is to explain the priority of importance factors of customer satisfaction in a supermarket, as a strategy for company to survive in retail business. Data is collected by spreading questioner to 385 respondents, and processed by using Importance-Performance Analysis (IPA) to compare between customer's expectations and company's perfomances. There are 11 factors that company must pay attention and it is shown in Cartesian Diagram
Evaluasi Kenyamanan Termal Ruang Sekolah SMA Negeri di Kota Padang Lusi Susanti; Nike Aulia
Jurnal Optimasi Sistem Industri Vol. 12 No. 1 (2013): Published in April 2013
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.v12.n1.p310-316.2013

Abstract

This research aims to determine thermal conditions and sensation of thermal comfort in classrooms of high schools in Padang. This study was conducted in 11 State Senior High School (SMA) represented 11 districts in Padang. About 10% of total student body in each schools were participated in this study to vote thermal comfort questioners. To determine thermal comfort level in this study, PMV (Predicted mean Vote) and PPD (Predicted Percentage of dissatisfied) method were used according to standard of thermal comfort in ASHRAE 55-2005 and ISO 7730. PMV method is used to determine scope of situation in the environment that scaled from +3 for very hot until -3 for very cold, and PPD is a method to calculate the number of human (in percentage) dissatisfied with the environment. Calculated PMV and PPD were compared with PMV and PPD resulted from individual vote from questionnaires. Result showed that in general, thermal conditions in classrooms had air temperature and radiant temperature from 27oC – 30oC, air humidity from 68% - 80%, and wind speed of 0 m/s. Calculated PMV from this condition were ranging from +1 slightly warm) until +2 (warm) while PPD calculated greater than 20%. Compared with calculated PMV and PPD values, the individual vote showed values from +0,5 (neutral) until +1 (slightly warm) while PPD values of individual vote greater than 20% except for SMA 2 and SMA 11 Padang. It is concluded that improvements of indoor thermal conditions have to make inside classrooms as well as landscape outside in order to improve thermal comfort level of students during learning and teaching.

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