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OPSI
Published by Universitas Pembangunan Nasional Veteran Yogyakarta
ISSN : 16932102     EISSN : 26862352     DOI : https://doi.org/10.31315/opsi
Core Subject : Engineering,
Industrial & Manufacturing Engineering
Jurnal OPSI adalah Jurnal Optimasi Sistem Industri yang diterbitkan oleh Jurusan Teknik Industri UPN “Veteran” Yogyakarta sebagai wahana publikasi hasil karya ilmiah, penelitian rekayasa teknologi di bidang Teknik Industri, Sistem Industri, Manajemen Industri dan Teknologi Informasi.
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Articles 273 Documents
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Selection of Alternative Suppliers Using Analytical Hierarchy Process dan Technique For Order Preference By Similarity To Ideal Solution Melani Magdalena Hutabarat; Agus Ristono; Sutrisno Sutrisno
OPSI Vol 14, No 2 (2021): ISSN 1693-2102
Publisher : Jurusan Teknik Industri Fakultas Teknologi Industri UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/opsi.v14i2.5411

Abstract

Garment industry is an industry that focuses on manufacture of clothing. Along with the times, development model and function clothing is increasingly varied. Company’s effort is  determine best supplier. Based on observations in Central Java garment industry, it was found problems related to continuity of fabric supply from major suppliers. When demand soars, demand for cloth supply also increases. However, the availability of fabric supplies owned by main suppliers is not able to meet the needs of garment industry. Therefore, garment industry requires alternative backup suppliers who are able to meet the supply of fabric when the main supplier is inadequate. Supplier selection will be carried out using the Analytical Hierarchy Process (AHP) method in weighting and Technique for Others Preference by Similarity to Ideal Solution (TOPSIS) method in ranking priority order of suppliers. This supplier priority will be used as an alternative supplier that will meet the availability of fabric supply.
The Effect of Complexity and Work Motivation on The Performance of Minor Change-Scale Product Development Projects In Automotive Manufacturing Industry Annisa Dewi Akbari; Indah Sepwina Putri
OPSI Vol 14, No 2 (2021): ISSN 1693-2102
Publisher : Jurusan Teknik Industri Fakultas Teknologi Industri UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/opsi.v14i2.5332

Abstract

The increasing market competition in the Indonesian automotive manufacturing industry requires automotive manufacturing companies to adapt to changes through product development activities. Unfortunately, failure in product development projects is still high. One of the possible key factors of a successful product development project is work motivation. Another factor that is suspected to affect is the complexity of the project. Therefore, this study aims to find the effect of work motivation and project complexity on product development project performance. The research was conducted on 94 members of product development project team in Indonesian automotive manufacturing industry with a minor change scale using purposive sampling. Data was collected through online questionnaire with a response rate of 65.7% and then analyzed using PLS-SEM. The results of the study showed that project complexity had a positive effect on work motivation and otherwise on project performance. On the other hand, it turns out that work motivation is not proven to affect the performance of product development projects in the automotive manufacturing industry in Indonesia.
Interrelationship of Millennial Generation Leadership Style Indicators at PLN Central Java & DIY Distribution Main Unit Using Interpretive Structural Modeling (ISM) Approach Muhdam Azhar; Mahfudz Mahfudz
OPSI Vol 14, No 2 (2021): ISSN 1693-2102
Publisher : Jurusan Teknik Industri Fakultas Teknologi Industri UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/opsi.v14i2.6303

Abstract

Manager at PT. PLN Persero has an important role in balancing internal relations with employees and external parties such as stakeholders. PT. PLN (Persero) Distribution Central Java and Yogyakarta D.I consists of a Unit Pelaksana Pelayanan Pelanggan (UP3) and Unit Layanan Pelanggan (ULP), ULP is directly related to the community and stakeholders. ULP Managers consists of Millennial Generation is 87% and Generation X 13%. The generation gap between Generation X and Generation Y (millennials) caused by the 7 years vacuum of recruitment, it causes of communication problems and Generation Y rapid adaptation to become young managers. Indicators identification are needed related to Generation Y's leadership style so that young managers are better prepared. Identification of the relationship between indicators is carried out using the Interpretive Structural Modeling (ISM) method and then classifying indicators using the Multiplication Applied to a Classification (MICMAC) method. There are 7 indicators obtained from ISM: M1 (Communication Method), M2 (Media Communication), M3 (Managing Team Involvement), M4 (Resolving Internal Conflicts), M5 (Risk Management), M6 (Responding to Change), M7 (Managing Stakeholder). MICMAC analysis results are M7 in the Dependent Indicators Cluster, the other indicators from M1, M2, M3, M4, M5, M6 are in the Linkage Indicators Cluster.
Genetic Algorithm Approach to Logistics Transportation and Distribution Problems: A Case Study of Parcel Delivery Services Miftahol Arifin
OPSI Vol 14, No 2 (2021): ISSN 1693-2102
Publisher : Jurusan Teknik Industri Fakultas Teknologi Industri UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/opsi.v14i2.4903

Abstract

Transportation and distribution activities require companies to have careful transportation planning to maintain resource efficiency. One form of planning in the transportation is planning the route and the number of vehicles. The research output is to get the best shipping route from each transportation in the form of the smallest shipping cost, delivery distance and shortest time. The approach used to determine the best route is the genetic algorithm (GA) method. In the application of GA in finding routes according to the objective, it gives the best results. From the results of the study, it was concluded that the GA algorithm was able to produce the best route effectiveness of 35.5% with a minimum distance of 76.4 km with the route 1-16-7-14-13-17-21-22-6-19-18 - 3-23-9-19-15-24-4-15-20-8-11-2-25-5-2 and a travel time of 4 hours 51 minutes and a fee of Rp. 213,000 with a delivery route on the test.
Proposed Maintenance Policy Design on Paving Molding Machine Using Reliability and Risk Centered Maintenance (RRCM) Method at PT XYZ I Gede Oka Mahendra; Fransiskus Tatas Dwi Atmaji; Judi Alhilman
OPSI Vol 14, No 2 (2021): ISSN 1693-2102
Publisher : Jurusan Teknik Industri Fakultas Teknologi Industri UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/opsi.v14i2.5477

Abstract

PT. XYZ is a company engaged in construction and manufacturing. The company focuses on paving production. Where there is a problem with paving printing machines in carrying out production, there are many productions that do not reach the target or the production process does not run optimally.   The purpose of this study is to find out the performance of paving molding machines, especially in the components that most often experience damage to paving molding machines. Based on historical data on machine damage, a paving molding machine is a machine that has had the highest frequency of damage for 5 years, because this machine operates continuously to meet production targets and paving demand from customers. Reliability and Risk Centered Maintenance (RRCM) methods to be used to analyze a historical engine malfunction. The results obtained in the form of 7 proposed maintenance tasks are 2 scheduled on-condition tasks, 3 scheduled restoration tasks, 2 scheduled waste tasks. In addition, the average maintenance time interval for pillow blocks is 7 months, iron molding is 11 months, and chain is 4 months. The total cost of proposed maintenance is lower than IDR 52,938,750 or 41.7% compared to the existing maintenance cost of PT. XYZ. The development of this research is to increase the application of RCM as a basis for maintaining the balance between preventive maintenance and corrective maintenance while optimizing maintenance costs to improve engine reliability by considering risk factors as an analysis.
Analysis of Supply Chain And Value Chain On Smoked Manyung Fish To Increase Sales On “Asap Indah” Fish Production Center Wonosari Village Demak Niken Siswaningsih; Pramudi Arsiwi; Tita Talitha
OPSI Vol 14, No 2 (2021): ISSN 1693-2102
Publisher : Jurusan Teknik Industri Fakultas Teknologi Industri UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/opsi.v14i2.5339

Abstract

Fish Production Center “Asap Indah” is one of the production centers in Demak, which specializes in processing fresh fish into semi-processed products, smoked fish. To support the sustainability of product distribution, supply chain management is needed to oversee the process from procurement of raw material to distribution to final consumers. Therefore, a comprehensive supply chain management analysis is necessary to increase sales and establish effective distribution channels. This research aims to understand the existing value chains of smoked manyung fish, the added value of each contributor on value chains, and to determine the most effective distribution channels of smoked manyung fish. The method used for data processing is descriptive-analytic SCM, Value Chain, and Value Added method. The result of this research, based on value-added calculation analysis using the Hayami method, shows fresh fish wholesalers give the least added value to the product or have the least amount of activities, so decreasing the unproductive activity to lower production cost is recommended. Value chain analysis shows that distribution channels or the most effective selling method of smoked fish are direct selling to the final consumer,accompanied by developing vacuum packaging to increase consumers’ interest in the product.
Portable Circulating Adsorption Column Design for Seawater Purification Mohammad Prasanto Bimantio; Amallia Ferhat
OPSI Vol 14, No 2 (2021): ISSN 1693-2102
Publisher : Jurusan Teknik Industri Fakultas Teknologi Industri UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/opsi.v14i2.5127

Abstract

Seawater is one of the largest natural resources and abundant in Indonesia, which contains salt, metals and mycobacteria. Even though the amount is abundant, its utilization is still not widespread, such as to be used as clean water or drinking water. The use of adsorbents aims to adsorb impurities in the fluid. The adsorption column that is widely used is in the form of a fixed-bed column with messy stacked filling. This makes it difficult to clean and fill the adsorbent, besides the irregular pile of adsorbents will hinder the flow process of the purified fluid. The research product is a circulating portable adsorption column design consisting of 3 parts, namely: top distributor, packing bed, and bottom collector. The principle of the three parts is like a puzzle where the number of packing beds can be adjusted according to the purification needs. The three parts are connected with threads so that they can be disassembled as desired. It is hoped that this product can meet the needs of adsorption-based purification that is easy, inexpensive, and can be customized according to various types of adsorbents. The design of this product can be duplicated for other adsorption purification processes, such as purification of bioethanol, wastewater, and biodiesel. 
3D Relief Cutting Process Using 2D Image Luminosity Grayscaling on The G-Weike WK1212 CNC Router Machine Dewa Kusuma Wijaya; Pramudi Arsiwi
OPSI Vol 14, No 2 (2021): ISSN 1693-2102
Publisher : Jurusan Teknik Industri Fakultas Teknologi Industri UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/opsi.v14i2.5505

Abstract

 This study implements the image litophane processing method to convert 2D images into 3D designs using image luminosity grayscaling techniques, so that the design process as input data for CNC router machining operations can be carried out quickly to support rapid prototyping technology. Furthermore, this research will process the 3D design into a 3D engraving object with a relief cutting process using a G-Weike WK1212 CNC router machine. Using the image luminosity grascaling technique, the color composition value is obtained to change the grayscale color image by 33% red, 59% green and 11% blue with a luminosity value of 35% or 89 from the range of luminosity grayscale levels 0 - 255. These results are further increased by 50% to 172 or 67% of the range of grayscale luminosity levels L[0, 255] so that it will be at the ideal luminosity value for the relief cutting process. Using a luminosity value of 172 from a grayscale image, the actual depth value is 1.82mm from a total depth of 3mm, which of course the relief pattern will look good.
Parameter Optimization of Customized FDM 3D Printer Machine for Biocomposite Material [Sago/PMMA] Using 2k Fractional Factorial Design Ibnu Abdul Rosid; Alva Edy Tontowi
OPSI Vol 14, No 2 (2021): ISSN 1693-2102
Publisher : Jurusan Teknik Industri Fakultas Teknologi Industri UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/opsi.v14i2.5352

Abstract

Bone fracture caused by various incident causes medical problems. Then bone restoration is required. Bone grafts can be used to solve this problem. One of the materials that can be used to produce bone graft is PMMA. PMMA requires to be combined with other materials to extend the solidification time. The material that can be used for bone graft material is sago starch. The main ingredient composition of Biocomposite [sago/PMMA] consists of sago: PMMA = 1 : 1 (w/w). The composition of the addition of MMA is 10% (v/w) of PMMA, this is to extend the curing time. Thus the material can be through from the chamber extruder to the nozzle. This research aims to obtain  combinations of 3D Printer FDM Customized machine parameters for minimizing of error dimension. The 3D Printer machine uses pneumatic system to push the material from the container to the chamber and used screw extruder to push the material out through the nozzle. The experimental design method used a 2k fractional factorial design, with 3 parameters, 2 levels and 3 responses. The experimental results obtained that the layer height parameter has a significant influence on the x-dimensional error. The optimization results obtained a combination of parameters to get the smallest error dimensions, the print speed is 25 mm/s, the layer height is 2.93 mm and the fill density is 20%. The results of optimization obtained that the x-dimensional error is 0.016, the y-dimensional error is 0.069 and the z-dimensional error is 0.4539.
Work Posture Evaluation on Ergonomic “Colet” Workbench Design in Batik Coloring Process using Rapid Entire Body Assessment and Nordic Body Map Amalia Amalia; Rudy Tjahyono; Jazuli Jazuli; Rodia Syamwil
OPSI Vol 14, No 2 (2021): ISSN 1693-2102
Publisher : Jurusan Teknik Industri Fakultas Teknologi Industri UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/opsi.v14i2.5302

Abstract

The effort to preserve batik is to maintain the continuity of batik production. Coloring process is one of the important processes in batik production. In addition to the dyeing technique, there is a “colet” technique in batik coloring process. Colet technique is considered an efficient technique in saving coloring dyes. The colet process is still carried out without standards and does not consider ergonomic aspects. This study aims to analyze the risk level of batik workers posture in colet technique coloring process. This research is an observational study with data analysis using the Rapid Entire Body Assessment (REBA) and Nordic Body Map (NBM). Based on the measurement, the risk level with the initial work posture has a score 9 and 7, which means the posture needs immediate corrective action to prevent occupational diseases. The implementation of Ergonomic “Colet” workbench is a way to improve work posture so the risk could be decreased, with score 4 both in standing and sitting working position.

Page 10 of 28 | Total Record : 273

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