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<![CDATA[Evaluasi Shift Kerja dan Penentuan Waktu Standar PT X Berdasarkan Beban Kerja ]]>
<![CDATA[Trisna Mesra]]>;
<![CDATA[Lusi Susanti]]>;
<![CDATA[Hilma Raimona Zadry]]>
<![CDATA[ Jurnal Optimasi Sistem Industri Vol. 15 No. 1 (2016): Published in March 2016 ]]>
Publisher : <![CDATA[The Industrial Engineering Department of Engineering Faculty at Universitas Andalas ]]>
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DOI: 10.25077/josi.v15.n1.p16-32.2016
<![CDATA[PT. X is one of the companies located in Dumai Industrial Region, produces fertilizer. This company has three production plants. The production capacity of the first plant is 450 tons/day, the second plant produces 750 tons/day and the third plant produces 700 tons/day. PT. X is supported by 2 sub companies, they are PT. A and PT. B. PT. A operates 5 bagging lines and PT. B operates 3 bagging lines. The fertilizer bagging process has three steps where each step has its own work station: putting the labeled sack to the hook followed by filling the sack with fertilizer, installing the tie cable, and sewing the fertilizer filled sack. From the initial survey, it was found that the processing time is not optimal to reach production target. PT. A and B have to set 24 working hours per day to run the target resulting on frequent over time, excessive fatigue and the negative impact of physically and mentally for the workers. Author’s hypothesis is the current condition has been one of the reasons for a decline of the production output. Therefore, the purposes of the research are to find the impact of current working hours and shift work pattern on the physical and psychological response of the workers and to calculate the standard time required to complete one cycle of bagging process. This standard time is very crucial to determine production target thus determine the optimal working hours and shift rotation. Measuring of heart rate are collecting results of a questionnaire of NASA-TLX are the parameters used to evaluate the physical and psychological response of workers. Two workers from different group worker, different shift work, from PT. A and PT. B were selected as samples to evaluate their heart rate pattern. The questioner spread out to all workers. Time standard was determined by observing and taking data of 40 bagging cycles for each shift work.The results show that shift work affecting the physiological response of workers in PT. B in the category between moderate to extreme especially for working element of arranging fertilizer sack to the pallet. This result was found for the two group workers. Frequent short rests between times are required to provide quick recovery for the workers and reduce excessive fatigue. Average standard time complete one bagging cycle was 0.12 minutes and 0.13 minutes for PT. A and PT. B, respectively. These standard times can be used to set the production output target for the two companies. Last, short rotation shift work with an additional number of workers is recommended for the shift pattern.]]>
<![CDATA[Algoritma Penentuan Ukuran Batch Integer pada Penjadwalan Flowshop Satu Mesin ]]>
<![CDATA[Hadigufri Triha]]>;
<![CDATA[Ahmad Syafruddin Indrapriyatna]]>;
<![CDATA[Jonrinaldi Jonrinaldi]]>;
<![CDATA[Berry Yuliandra]]>
<![CDATA[ Jurnal Optimasi Sistem Industri Vol. 15 No. 1 (2016): Published in March 2016 ]]>
Publisher : <![CDATA[The Industrial Engineering Department of Engineering Faculty at Universitas Andalas ]]>
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DOI: 10.25077/josi.v15.n1.p1-15.2016
<![CDATA[Scheduling is an important area of production planning and control. Scheduling is required to produce an existing job by allocating existing resources in the proper execution order. Production schedules arranged effectively and efficiently to maximize resources utility, minimize waiting and idle time and increase productivity. The flowshop batch scheduling model for one machine that takes inventory and quality cost into account has been developed by Indrapriyatna et al (2007a). However, the model yet effective in converting the results of batch size into integers. This study tried to resolve this problem by using a modification of Branch and Bound Algorithm approach. ]]>
<![CDATA[Cover & Preface ]]>
<![CDATA[Hilma Raimona Zadry]]>
<![CDATA[ Jurnal Optimasi Sistem Industri Vol. 15 No. 1 (2016): Published in March 2016 ]]>
Publisher : <![CDATA[The Industrial Engineering Department of Engineering Faculty at Universitas Andalas ]]>
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<![CDATA[Pengendalian Persediaan Primary Items dalam Logistik Konstruksi ]]>
<![CDATA[Lady Lisya]]>;
<![CDATA[Rika Ampuh Hadiguna]]>
<![CDATA[ Jurnal Optimasi Sistem Industri Vol. 15 No. 1 (2016): Published in March 2016 ]]>
Publisher : <![CDATA[The Industrial Engineering Department of Engineering Faculty at Universitas Andalas ]]>
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DOI: 10.25077/josi.v15.n1.p93-104.2016
<![CDATA[Construction logistics are activities that consist of ordering, storage and transportation of materials of construction projects. Storage material is logistics activity that ensure the availability of materials in project site. Generally, material storage activities have been conducted at the project site. Logistics construction is aimed to support the project activities that the completion schedule has been set. Construction logistics issues is determining the schedule of ordering materials so that the project can be implemented on schedule. The purpose of research is to determine the optimum ordering period for the primary items on the main building structure construction and designing inventory control cards as a mechanism for monitoring procurement of materials. This research has been obtained optimal ordering period for the primary items of main building structure with elements of the work using Fixed Period Requirement method. Inventories were already meet the material requirement of each period. Material management has been conducted based grouping approach as many as 31 groups. In addition, this research has proposed the inventory control cards as an instrument for material procurement monitoring. The implications of inventory control cards are coordinate contracting parties with vendors to plan the replenishment of materials to meet the work schedule. Further research can be developed with other aspects such as integrated material order system between contractors and vendors to consider the safety stock. In addition, the information system for planning material is an important consideration for construction projects with large scale so that the companies can plan primary items inventory and other materials in the projects completion more easily, quickly and accurately. ]]>
<![CDATA[Perancangan Model Pengukuran Kinerja Rantai Pasok Berbasis Lean dan Green menggunakan Balance Scorecard di PT. P&P Lembah Karet ]]>
<![CDATA[Alizar Hasan]]>;
<![CDATA[Berry Yuliandra]]>;
<![CDATA[Eureka Perdana Putra]]>
<![CDATA[ Jurnal Optimasi Sistem Industri Vol. 15 No. 1 (2016): Published in March 2016 ]]>
Publisher : <![CDATA[The Industrial Engineering Department of Engineering Faculty at Universitas Andalas ]]>
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DOI: 10.25077/josi.v15.n1.p33-46.2016
<![CDATA[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.]]>
<![CDATA[Evaluasi Shift Kerja dan Penentuan Waktu Standar PT X Berdasarkan Beban Kerja ]]>
<![CDATA[Trisna Mesra]]>;
<![CDATA[Lusi Susanti]]>;
<![CDATA[Hilma Raimona Zadry]]>
<![CDATA[ Jurnal Optimasi Sistem Industri Vol. 15 No. 1 (2016): Published in March 2016 ]]>
Publisher : <![CDATA[The Industrial Engineering Department of Engineering Faculty at Universitas Andalas ]]>
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DOI: 10.25077/josi.v15.n1.p16-32.2016
<![CDATA[PT. X is one of the companies located in Dumai Industrial Region, produces fertilizer. This company has three production plants. The production capacity of the first plant is 450 tons/day, the second plant produces 750 tons/day and the third plant produces 700 tons/day. PT. X is supported by 2 sub companies, they are PT. A and PT. B. PT. A operates 5 bagging lines and PT. B operates 3 bagging lines. The fertilizer bagging process has three steps where each step has its own work station: putting the labeled sack to the hook followed by filling the sack with fertilizer, installing the tie cable, and sewing the fertilizer filled sack. From the initial survey, it was found that the processing time is not optimal to reach production target. PT. A and B have to set 24 working hours per day to run the target resulting on frequent over time, excessive fatigue and the negative impact of physically and mentally for the workers. Author’s hypothesis is the current condition has been one of the reasons for a decline of the production output. Therefore, the purposes of the research are to find the impact of current working hours and shift work pattern on the physical and psychological response of the workers and to calculate the standard time required to complete one cycle of bagging process. This standard time is very crucial to determine production target thus determine the optimal working hours and shift rotation. Measuring of heart rate are collecting results of a questionnaire of NASA-TLX are the parameters used to evaluate the physical and psychological response of workers. Two workers from different group worker, different shift work, from PT. A and PT. B were selected as samples to evaluate their heart rate pattern. The questioner spread out to all workers. Time standard was determined by observing and taking data of 40 bagging cycles for each shift work. The results show that shift work affecting the physiological response of workers in PT. B in the category between moderate to extreme especially for working element of arranging fertilizer sack to the pallet. This result was found for the two group workers. Frequent short rests between times are required to provide quick recovery for the workers and reduce excessive fatigue. Average standard time complete one bagging cycle was 0.12 minutes and 0.13 minutes for PT. A and PT. B, respectively. These standard times can be used to set the production output target for the two companies. Last, short rotation shift work with an additional number of workers is recommended for the shift pattern]]>
<![CDATA[Pembuatan Knowledge Management pada External Cylindrical Grinding ]]>
<![CDATA[Ikhwan Arief]]>;
<![CDATA[Muhammad Arieaman Fikri]]>
<![CDATA[ Jurnal Optimasi Sistem Industri Vol. 15 No. 1 (2016): Published in March 2016 ]]>
Publisher : <![CDATA[The Industrial Engineering Department of Engineering Faculty at Universitas Andalas ]]>
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DOI: 10.25077/josi.v15.n1.p47-61.2016
<![CDATA[Knowledge management is a process that helps an organization or company in identifying, selecting, preparing, distributing and sending important information and expertise part of an organization or a company to change the behavior or attitude that is not in place. Grinding processes are usually based on the experiences of people who have are experts in their work (tacit knowledge) that will be collected and converted into explicit knowledge so that the information can be maintained and easily accessible.The design began by analyzing the external cylindrical grinding systems and translate them into Unified Modelling Language (UML) which was followed by the design of database and computer software, and test the software. The application software is web-based and can be accessed by multiple users. The application will help the operator in determining parameters with given option of parameter recommendation. The system gives recommendations based on the tacit knowledge that has been gathered into explicit knowledge. The output of the application is a list of selected parameters and report cases. Report data in the case will be used to set up the machine.]]>
<![CDATA[Algoritma Penentuan Ukuran Batch Integer pada Penjadwalan Flowshop Satu Mesin ]]>
<![CDATA[Hadigufri Triha]]>;
<![CDATA[Ahmad Syafruddin Indrapriyatna]]>;
<![CDATA[Jonrinaldi]]>;
<![CDATA[Berry Yuliandra]]>
<![CDATA[ Jurnal Optimasi Sistem Industri Vol. 15 No. 1 (2016): Published in March 2016 ]]>
Publisher : <![CDATA[The Industrial Engineering Department of Engineering Faculty at Universitas Andalas ]]>
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DOI: 10.25077/josi.v15.n1.p1-15.2016
<![CDATA[Scheduling is an important area of production planning and control. Scheduling is required to produce an existing job by allocating existing resources in the proper execution order. Production schedules arranged effectively and efficiently to maximize resources utility, minimize waiting and idle time and increase productivity. The flowshop batch scheduling model for one machine that takes inventory and quality cost into account has been developed by Indrapriyatna et al (2007a). However, the model yet effective in converting the results of batch size into integers. This study tried to resolve this problem by using a modification of Branch and Bound Algorithm approach.]]>
<![CDATA[Penjadwalan Cement Mill Berbasis Minimasi Faktor Klinker dalam Proses Pembilasan dan Impor Klinker ]]>
<![CDATA[Nilda Tri Putri]]>;
<![CDATA[Indah Kurnia Ramadhani]]>
<![CDATA[ Jurnal Optimasi Sistem Industri Vol. 15 No. 1 (2016): Published in March 2016 ]]>
Publisher : <![CDATA[The Industrial Engineering Department of Engineering Faculty at Universitas Andalas ]]>
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DOI: 10.25077/josi.v15.n1.p62-77.2016
<![CDATA[PT Semen Padang is one of the cement companies in Indonesia. Cement production influenced by the number of demand, raw materials and the number of the available machine. The number of demand increases with a corporate capacity which keeps the company had to set an optimal production schedule. Scheduling production should be followed by the availability of raw materials (clinker). The number of clinkers required influenced by the number of demands and clinker elapsed to the flushing process. Flushing process happens if the transition products produced from Non-OPC to a product OPC, for one flushing process causes clinker consumption 7% more than the existing capacity decreases. Deficient in a capacity covered by importing clinker which causes high-cost production. So, it necessary to make cement mill schedule by minimizing flushing process, so clinker that will be used become optimized. Steps that will be done in this study began with the survey system, identify problems, and data collection. Data collected are machine cement mill and kiln capacity, demands, and flushing process. Then designed a formulation model that minimizes clinker factor and the number of clinker imports needed, so that obtained scheduling machine cement mill to produce OPC and Non-OPC. Results obtained by reducing the number of flushing process because the cement mill designed to produce one type of product per day, so the flushing process could happen if there is transition cement production Non-OPC on the day-i to cement OPC on the day i+1. Cement OPC produced by Indarung II, III, and V. Indarung IV only produced cement Non-OPC, so the flushing process happened in Indarung II, III, and V.]]>
<![CDATA[Pengembangan Model Economic Production Quantity (EPQ) dengan Sinkronisasi Demand Kontinu dan Diskrit Secara Simultan ]]>
<![CDATA[Nurike Oktavia]]>;
<![CDATA[Henmaidi]]>;
<![CDATA[Jonrinaldi]]>
<![CDATA[ Jurnal Optimasi Sistem Industri Vol. 15 No. 1 (2016): Published in March 2016 ]]>
Publisher : <![CDATA[The Industrial Engineering Department of Engineering Faculty at Universitas Andalas ]]>
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DOI: 10.25077/josi.v15.n1.p78-86.2016
<![CDATA[The most popular inventory model to determine production lot size is Economic Production Quantity (EPQ). It shows enterprise how to minimize total production cost by reducing inventory cost. But, three main parameters in EPQ which are demand, machine set up cost, and holding cost, are not suitable to solve issues nowadays. When an enterprise has two types of demand, continue and discrete demand, the basic EPQ would be no longer useful. Demand continues comes from a customer who wants their needs to be fulfilled every time per unit time, while the fulfillment of demand discrete is at a fixed interval of time. A literature review is done by writers to observe other formulation of EPQ model. As there is no other research can be found which adopt this topic, this study tries to develop EPQ model considering two types of demand simultaneously.]]>
