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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 255 Documents
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Determination of Distribution Center Location using Analysis of Time-Based Set Covering Model and Maximal Covering Model Analysis Rainisa Maini Heryanto; Santoso Santoso
OPSI Vol 16, No 1 (2023): 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.v16i1.8760

Abstract

The distribution or delivery process is one factor that affect customer satisfaction as the goal of supply chain. In order for supply chain to be competitive in competition, delivery time is an important factor to manage, so that it could provide high service level value. One factor that could affects distribution or delivery is distribution center location. A strategic distribution center location would facilitate and speed up distribution process. This research discusses model for determining location of distribution center so that delivery could be made at the right amount and in the right time by analyzing of time-based using set covering model and maximal covering model. The numerical example in this research is case study on paint supply chain in Bandung which has a number of delivering clusters. Each cluster consists of a number of building material stores which are located scattered. There is one cluster that has problems in fulfilling demands and delivery times. The analysis made could be used to determine the distribution center location so that it could serve all consumer demands. Based on the calculation results, it was found that there were two distribution center locations. Two distribution centers could fulfill the objective function of cost minimization and satisfy all demands. The results of the sensitivity analysis show that there are several factors that influence the determination of location number.
Feasibility Study of Machines Addition in CV. XYZ Astrid Wahyu Adventri Wibowo; Tri Wisudawati
OPSI Vol 16, No 1 (2023): 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.v16i1.9148

Abstract

CV. XYZ is a belt-producing MSME located in Surakarta. The problems faced by CV. XYZ is the unavailability of product variations, or it can be said that these MSMEs do not yet have various product differentiations. Coupled with productivity at CV. XYZ is still bad. The workers use manual tools and the belts are perforated using nails and hammers. Based on these problems, this study aims to help CV. XYZ determines the best investment alternatives in order to maximize profits. There are 2 investment alternatives offered to increase product differentiation CV. XYZ. The first alternative (A1) is to add a pattern-making machine and replace a belt-punching tool, while the second alternative (A2) is to invest in adding a motif-making machine only. In this study, several methods were used, namely Pay Back Period (PBP), Net Present Value (NPV), Internal Rate of Return (IRR), and Profitability Index (PI). Recommendations are given to CV. XYZ is the second alternative (A2), which is investing in the addition of a pattern-making machine.
Facility Layout Planning for Pyrolyzer Production Using Automated Layouts Design Program (ALDEP) Method Achmad Pratama Rifai; Arief Rahman Alfithra; Chanif Faruq Al'adiat; Wangi Pandan Sari
OPSI Vol 16, No 1 (2023): 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.v16i1.8745

Abstract

One important factor to consider in increasing productivity in a company is the design of the facility layout. PT Hari Mukti Teknik is keen producing pyrolysis machine to contribute to addressing waste issue in Indonesia. Currently, the facility layout at the company is not suitable to produce pyrolizers as it was set up to produce industrial scale washing machines. To improve production efficiency, PT Hari Mukti Teknik needs facility layout that can be optimized for pyrolizers. The purpose of this study is to provide a layout design proposal for the pyrolysis machine manufacturing process to obtain an effective and efficient process. Here, we used ALDEP method to produce layouts based on consideration of the level of relationship between departments. There were 4 alternatives for the manufacturing and production and two alternative layouts for employee and office area. The design for new layout was selected based on the closeness relationship between the departments. An overall facility layout plan that is required for the production of pyrolysis machines is a building area the total of 1045 m² covering manufacturing, production, employee, office and parking space areas.
Analysis of Potential Hazards and Control in PT XYZ's Production Process with the HIRADC Method Tika Puspitasari; Ismianti Ismianti
OPSI Vol 16, No 1 (2023): 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.v16i1.9289

Abstract

In carrying out the production process, the company must pay attention to the health and safety of the workforce to support labor productivity. However, K3 at PT XYZ, especially in the production process, is still not going well according to the law, one of which is the use of PPE is considered not important by the workforce. This study aims to analyze the risks and controls in the production process. This research was conducted by identifying potential hazards by categorizing them into risk levels and determining the control of potential hazards in the production process using the HIRADC method. The results of this study indicate that there are 9 risks in the production division, with the grouping of 5 risks classified as high risk (high) which includes high risks such as bandsaw regarding sawdust, assembly, 1 moderate risk (moderate) risk, namely the raw material part, and 3 the risk is classified as low risk (low) which includes low risk such as band saw machines for chop saws. Based on the results of the risk assessment, most machines are classified as high risk, so it is necessary to improve the implementation of K3 and improve the source of danger. Of all the hazards and risks in the production division of PT XYZ, an analysis of potential hazards and their control is carried out using the HIRADC method. The recommendations given include completing PPE, carrying out engineering for example, carrying out eliminations such as using dust powder covers and using push sticks.
The Analysis of Internet Service Provider (ISP) Service Quality to Maintain Customer Loyalty in The B2B Market Andhika Mayasari; Fatma Ayu Nuning Farida Afiatna; Sumarsono Sumarsono
OPSI Vol 16, No 1 (2023): 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.v16i1.8194

Abstract

The use of an internet network in an organization cannot be divorced from the numerous types of challenges that occur inside it, particularly those connected to network service quality., In addition, the high demand for service users has become a severe issue where people believe that the network needs to be optimally utilized. This research examined the connection between ISP service quality and B2B customer loyalty to business Internet services. This work employs Structural Equation Modeling with Partial Least Square methodology for SEM data analysis (PLS-SEM). The research revealed a favourable and statistically significant correlation between BP trust and BP loyalty. Because BP believes in the quality and service of ISP providers, they are typically loyal to BP. In addition, NQ and SP have a sizeable direct association with client loyalty. Moreover, this research showed that QSTS had a good and substantial effect on BP's level of trust. Meanwhile, CSTS, NQ, and SP have a favourable and significant impact on BP value.
The Proposed Warehouse Improvement Using Lean Approach to Eliminate Waste at the Main Warehouse of PT. XYZ Danaswara Amara Dhika; Amal Witonohadi; Annisa Dewi Akbari
OPSI Vol 16, No 1 (2023): 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.v16i1.7310

Abstract

One of the grocery companies in Indonesia provides a multi-channel e-groceries digital platform for online daily shopping activities. One of the important elements that support the operational activities of an e-commerce service industry is the warehouse, which serves as a storage place for goods sold and plays a role in maintaining the quality of products before being sent to consumers. Based on observations and interviews directly with employees at the Main Warehouse, one of the causes of waste in its operational activities is the lack of optimal warehousing activities. This research aims to find out and identify waste in the Main Warehouse’s warehousing activities so that the waste that occurs can be investigated, the implementation of the Lean Warehouse approach is needed in its warehousing activities. The research began with Current State VSM with a PCE value of 47.94%, followed by Process Activity Mapping (PAM) and TIM U WOOD Assessment Questionnaire. The results of this study were obtained based on predictions after the proposed improvements were implemented, there was a reduction in processing time and the amount of waste that occurred in several operational activities at the Main Warehouse. The PCE value increased as 5.22% to 53.16% in the Future State VSM.
Analysis of Critical Activity in the Hydromechanical Component Fabrication Project for Dam “X” using the Critical Path Method Pramudi Arsiwi; Tita Talitha; Dony Satriyo Nugroho; Maharsa Pradityatama
OPSI Vol 16, No 1 (2023): 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.v16i1.9144

Abstract

One of the projects currently being undertaken by PT. XYZ is Dam “X”. Based on project management data obtained from PT. XYZ, the actual project construction process experienced a significant delay from the planned schedule, with a delay duration of approximately 30 days. The delay will have an impact on the duration of the final completion of the project, including the process of delivering project results to consumers. The purpose of this study is to determine the critical path in project implementation and identify activities that do not have slack time because it will affect the duration of the overall project completion. The method used in this study is the Critical Path Method (CPM), which is a network method consisting of a series of activity components with the longest total time and showing the fastest duration of project completion. The results showed that the Manufacturing Project has a total of 11 critical activities out of 37 activities (work packages), with a total critical time of 75 days. The total critical time from the calculation of the CPM method also shows the optimal total project duration which can be used as a reference for the project team for the completion of a fabrication project or a hydromechanical component installation project on Dam "X".
Perancangan Kursi Roda Terapi untuk Penderita Stroke Kartika Suhada; Rainisa Maini Heryanto; Winda Halim; Tubagus Panji Ismail
OPSI Vol 16, No 1 (2023): 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.v16i1.9111

Abstract

Stroke could cause paralysis and reduced body function. In an effort to self-mobilize, a stroke patient needs a wheelchair. Even though the existing wheelchairs have undergone significant development, both in terms of design and technology, the function of these wheelchairs is still limited, to assist users in carrying out their daily activities and there is no wheelchair that functions as a wheelchair. therapy tool. One way to recover from a stroke and help prevent further disability is therapy, both medical therapy and alternative therapy. Therefore, in this study a wheelchair was designed to function as a therapeutic tool by making circular movements carried out by the arms, hands and legs as well as movements away from and towards the chest carried by the arms and hands so that the muscles could be strengthened, thus helping the recovery process from stroke, especially those that attack the hands and feet of stroke sufferers. The method used in the design is design thinking that focuses on humans, knowing user needs, and innovating according to user needs. The design thinking process consists of 5 stages: empathize, define, ideate, prototype, and test. In its design, wheelchairs are also made to consider ease of installation and use.
Quality Improvement of Tin Ingot Product Using Six Sigma Method at PT Timah Tbk Idriwal Mayusda
OPSI Vol 16, No 1 (2023): 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.v16i1.7434

Abstract

Bangka brand (BA) tin metal bar (ingot) has the highest defect percentage value of 2.01% from June to September 2021. This percentage exceeds the minimum non-conformity product standard of 0.25 %. This study aims to identify the types and factors that cause defects and propose improvements for the quality of products. The research uses the six-sigma method with DMAIC stages. Types of ingot defects include winging, rough surface, curved edges, bumps on the surface, presence of flakes, asymmetrical brand logos, spatters of tin metal, cracks/breaks, and exceeding weight specification. The results of the sigma level are 2.36 (variable data) and 3.15 (attribute data). The highest RPN value (240) occurs in the type of failure of the tin ingot test with the cause of failure, namely, the machine is experiencing troubleshooting. The second highest RPN value (210) occurs in the casting process with the cause of failure, namely the operator's lack of job mastery. Proposed improvements that can be implemented are the application of tin casting process work instructions. The implementation results show an increase in the sigma level to 2.44 (variable data) and 3.19 (attribute data).
Conceptual Model of Inhibiting Factors to Intent as Waste Cooking Oil Collection Facility Siti Mahsanah Budijati; Fatma Hermining Astuti; Wandhansari Sekar Jatiningrum
OPSI Vol 16, No 1 (2023): 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.v16i1.8554

Abstract

One of the critical points in realizing reverse logistics (RL) activities is determining the collection location for the products to be managed. Used cooking oil is a consumable product that can be collected through RL activities. Currently, the collection of used cooking oil in some food service businesses in the city of Yogyakarta is carried out by collectors. Collectors carry out their activities based on economic interests. In contrast, from the view of long-term interests, the management of used cooking oil is a manifestation of a sustainable supply chain. So that the management of used cooking oil is not solely aimed at economic interests but also to realize environmental sustainability and social support, cooperation between food service businesses is needed. One form of such cooperation is the provision of collection facilities. However, preliminary studies in this research found that no food service businesses were willing to act as collection facilities. For this reason, this study proposes a conceptual model of the inhibiting factors for intending as a used cooking oil collection facility for food service business actors. The research method was carried out through a literature review as the basis for preparing the conceptual model. The resulting model can be used as a basis for further research.

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