cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
Hasan
Contact Email
jurnal.opsi@upnyk.ac.id
Phone
-
Journal Mail Official
eko_nsby072@upnyk.ac.id
Editorial Address
d.a Jalan Babarsari 2 Tambakbayan Yogyakarta 55281
Location
Kab. sleman,
Daerah istimewa yogyakarta
INDONESIA
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.
Arjuna Subject : -
Articles 255 Documents
 21   22   23   24   25 
Redesign of workstations to minimize musculoskeletal disorders for guitar workers in Indonesia Pratiwi, Indah; Jannah, Isnainiyah Wardatul
OPSI Vol 17 No 1 (2024): 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.v17i1.10837

Abstract

This study aims to determine and analyze body parts that experience musculoskeletal disorders (MSDs) and muscles that experience fatigue in guitar-making workers. The method used is the Nordic Body Map (NBM) to determine MSDs complaints, including complaints of pain in 28 parts of the worker's body, and the Muscle Fatigue Analysis (MFA) method to determine muscle fatigue that occurs in each part of the body by determining the level of effort, duration of work, and frequency of work movements. The results of research using NBM were 2 workers with high risk, 3 workers with medium risk, and 7 workers with low risk. The results of the MFA method were that 3 workers experienced muscle fatigue in the very high category with priority in the neck, back, shoulders, right arm, wrist and feet. Efforts to minimize the risk of MSDs by redesigning work facilities using SolidWorks software and reducing the risk of muscle fatigue by improving work facilities, improving the layout of the production floor, and encouraging workers to stretch their muscles and exercise regularly.
Analysis of workload and fatigue Batik Cap workers in Sukoharjo Lestari, Mathilda Sri; Komariah, Ainur; Suprapto, Suprapto; Sari, Maria Puspita
OPSI Vol 17 No 2 (2024): 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.v17i2.10947

Abstract

Batik is an ancestral heritage of the Indonesian people that has been preserved to this day, particularly on the island of Java. In Java, the centers of the batik industry are located in Pekalongan, Yogyakarta, Surakarta, and Sukoharjo. In Sukoharjo, there are several home industries producing batik cloth, especially in the Krendetan Sukoharjo area, which specializes in both written and stamped batik. The batik-making process in these home industries is performed manually using simple tools. A preliminary survey revealed that the batik-making process involves repetitive tasks and imposes a high workload, particularly in the batik stamping process. This study aims to determine energy expenditure during work, energy expenditure during rest, and energy consumption needs for workers in the batik industry. The research was conducted in the stamping section and the boiling process to remove wax from the fabric. The results showed that energy expenditure during the batik stamping process was 382 kcal/hour, while in the boiling process it was 402 kcal/hour. Energy expenditure during rest was 354 kcal/hour in the stamping process and 367 kcal/hour in the boiling process. Energy consumption during the stamping process was 29 kcal/hour, and in the boiling process, it was 36 kcal/hour. The required rest time for the stamping process was 7.43 minutes per 15 minutes of work, while for the boiling process it was 5 minutes per 30 minutes of work.
Improving online learning through student stress evaluation Sarvia, Elty; Wirawan, Christina; Kristianti, Meilena; Ramadhani, Zukhruf
OPSI Vol 17 No 2 (2024): 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.v17i2.10982

Abstract

The COVID-19 pandemic impacted almost all countries and caused disruptions in education. Governments, including Indonesia, closed schools and campuses to mitigate the spread of COVID-19, leading to a transition to online learning. This lasted for two years and continued with hybrid learning. The abrupt change increased stress, especially for already stressed students. This study assessed stress levels during online learning at the Industrial Engineering Study Programme of Maranatha Christian University, Bandung. Stress was measured subjectively using the Perceived Stress Scale (PSS) and objectively using Galvanic Skin Response (GSR) and pulse sensors on thirty-two students. The PSS results classified the stress perception of most students as ‘normal’ or ‘moderate’. Meanwhile, the results of the GSR and pulse sensor measurements indicated that the students were stressed. Furthermore, a comparison of stress levels between synchronous and asynchronous learning and between mathematics and theory courses was conducted. According to the findings, there was a difference in the average heart rate values between synchronous and asynchronous learning. There was also a difference between mathematics and theory courses. With this research, it is necessary to pay attention to learning methods, materials, etc. need to be designed to reduce student stress and improve student performance.
Improving implementation of occupational health and safety of construction company by Job Safety Analysis (JSA) method (study case at PT Arto Moro Sentosa) Sulistyo, Arif Budi; Putra, Nugroho Pratama; Wijaya, Hartadi; Hidayanti, Nur
OPSI Vol 17 No 1 (2024): 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.v17i1.11005

Abstract

The construction sector is a sector that employs many people who have high risk of work accidents, because a lot of work in this sector is possibility carried out by unsafe actions or unsafe conditions. PT. Arto Moro Sentosa is company which operates in general trading, general construction, suppliers, outsourcing, etc., is aware that the business has a high risk of work accidents. The lack of employee awareness will have an impact on the magnitude of the risks that must be borne by the worker and the company. The purpose of this research is determining work accident records for the Occupational Health and Safety (OHS) system, employee risks, and existing improvements at company. By knowing the classification of hazards based on the type of accident, this research uses the Job Safety Analysis (JSA) method, histograms, Pareto diagrams, and cause-and-effect (fish bone) diagrams. Based on the author's observations, company data related to OHS (Occupational Health and Safety) and interviews with the directors, could be obtained a history of work accidents based on the type of accident. Here are ergonomic work accidents (57.89%), physical factor accidents ( 31.58%), chemical factor accidents (5.26%), biological factor accidents (5.26%), and psychological factor accidents (0%). Several recommendation is performed to avoid repeated accident by providing training programs on OHS to workers, paying more attention to OHS supervision, giving sanctions to workers who violate OHS.
Performance measurement of organic tea supply chain with supply chain operation references (Case study of active tegal subur farmer group, Kulon Progo) Soejanto, Irwan; Pratama, Ferdiansyah Aji; Nursubiyantoro, Eko
OPSI Vol 17 No 1 (2024): 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.v17i1.11036

Abstract

Tegal Subur Aktif Farmer Group is one of the organic tea producers located in Menoreh Hills, precisely in Nglinggo, Pagerharjo, Samigaluh, Kulon Progo. The efforts carried out by this farmer group include the procurement of tea ingredients, the provision of production facilities, the cultivation and maintenance of tea plants, the processing of agricultural products and trade in general. Processed organic tea products, such as green, black, yellow, and roasted, are produced.   Farmer groups have uncertain orders that can only be fulfilled partially, which can still affect customer satisfaction. In total, there are 95.39% of uncertain orders that can be fulfilled in the period August 2021 – March 2022. This is related to production planning with actual production caused by uncertain or regular supply of raw materials. If the collection of raw material supply is still carried out, it causes cost losses in collecting raw materials. The Tegal Subur Aktif Farmer Group has never measured its supply chain performance. If measurement is not carried out, supply chain performance may develop slowly. This study aims to measure the organic tea supply chain's performance and determine which indicators need improvement. This research uses the Supply Chain Operation References (SCOR) and Analysis Hierarchy Process (AHP) methods. Based on the data processing carried out, by measuring supply chain performance with Supply Chain Operation References (SCOR) and Analysis Hierarchy Process (AHP), the supply chain performance of the Active Tegal Subur Farmer Group can be improved.
Multi objective optimization approach for multi-item inventory control: A case study in leather industry Nafisah, Laila; Prasetyo, Gigih Jono; Nursubiyantoro, Eko; Chaeron, Mochammad; Soepardi, Apriani; Suharsih, Sri
OPSI Vol 17 No 1 (2024): 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.v17i1.11106

Abstract

PT ASA is a leather tanning company. Almost 65% of the company's assets are allocated for the procurement of raw leather, which consists of goat and sheepskin. In addition to being expensive, the availability of raw leather is also very limited. The company faces a trade-off where, on one hand, the raw material is easily decayed, but on the other hand, its availability is extremely limited, and if there is not enough inventory, the production process will be disrupted. In this research, a multi-objective optimization model is developed for controlling the inventory of raw leather using the Fuzzy Goal Programming approach. The objectives to be achieved are to minimize the total inventory cost, maximize the total quantity of raw leather that meets standards, and minimize the total cost of losses due to decayed raw leather. Based on the calculations, the fuzzy goal programming membership function value is obtained at 0.9155, with a total inventory cost over the planning horizon of IDR 10,341,630,000, a total of 1,279,542 sq ft of raw leather meeting standards, and a total loss cost due to decayed raw leather of IDR 142,911,691.
The combination of the kaizen approach with the Design of Experiment (DoE) method for improving quality of the bread and donut products in SMEs Wiyatno, Tri Ngudi; Kurnia, Hibarkah; Putri, Isria Miharti Maherni; Nugroho, Rifal
OPSI Vol 17 No 1 (2024): 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.v17i1.11108

Abstract

Competition for Small and Medium Enterprise (SME) products is currently getting tougher, in terms of quality, timely delivery, and competitive prices. SME customers of bread and donut products sometimes complain about the visual quality of bread and donut products that are stale, burnt, and dirty. The purpose of this research is to reduce product defects during the production process and improve the quality of the bread and donut products. This research method uses a Kaizen approach combined with the Design of Experiment (DoE) one-shoot case study method and uses organoleptic tests to assess the quality of bread and donut products. This study found that there were 3 product defect problems, namely bread and donut defects that did not rise, burnt donut defects, bread defects, and dirty donuts. This research resulted in a decrease in defects of 65% from 3.84% to 1.07%. While the best DoE test results used dough type C with 10 grams fermipan/yeast composition and 15 grams bread improver, stove 165-1750C, equipment cleaning frequency 1 time for each dough, and organoleptic test with 10% beetroot extract addition resulted in a color aspect score of 70 %, 65% aroma aspect, 68.5% texture aspect, and 70% taste aspect which is liked by many people. 
Implementation of the design thinking process approach to improve crimping production working systems on lathes machines Primasari, Monica Sandra; Kurnianingtyas, Chandra Dewi; Kurnia, Hibarkah
OPSI Vol 17 No 1 (2024): 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.v17i1.11209

Abstract

Fulfillment of orders for a product in the lathe industry often misses the processing deadline because the production process time is not well measured. One of the products produced by a lathe is crimping, this product often takes a long production process until 23.80 working hours. The purpose of this research is to identify the problems that cause the standard time for the crimping process to be high and provide the best solution for companies to reduce the standard time for the crimping production process. This research method uses the Design Thinking Process (DTP) which is divided into 5 stages, including Empathize, Define, Ideate, Prototype, and Test also called the EDIPT stage. The application of the EDIPT method also uses several methods or improvement tools. The improvements that have been made by the company are from the causes of methods, humans, and the environment. This research has resulted in a decrease in the standard time for the crimping process which originally obtained a processing time in 1 product of 1,428 minutes, while the standard time for the implementation of improvements was 1,375 minutes, so this research has succeeded in reducing the standard time in the crimping production process or reducing CSF by 3.71%. 
Factors that influence worker behavior towards occupational safety and health using the SEM-PLS method at PT. Industri Kapal Indonesia (Persero) Makassar Herdianzah, Yan; Wahyuni P, A. Dwi; Ahmad, Arfandi; Chantika, Aulia Marista Dewi; Saleh, Anis; Fole, Asrul; Safutra, Nur Ihwan
OPSI Vol 17 No 2 (2024): 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.v17i2.11211

Abstract

PT. IKI is a shipbuilding company owned by the Indonesian government which carries out several industrial activities such as ship building, repair and docking. The results of initial observations found that there were still workers in the production division who experienced work accidents and occupational diseases. In this research, it is very important to analyze the factors that influence the behavior of production division workers to find out what suggestions for improvements are appropriate in overcoming problems with production division workers. This research employs the SEM-PLS method to investigate the impact of knowledge factors (X1), attitudes (X2), and the availability of facilities (X3) on the occupational safety and health of production division workers. It aims to provide valuable insights for enhancing workplace safety by identifying factors that positively influence these outcomes. The findings of this study reveal a significant correlation between the availability of facilities (X3) and occupational safety and health, as evidenced by a p-value of 0.000, which is less than the predetermined significance level of 0.05. Based on these results, recommendations for improvement can be proposed. The company is advised to uphold and enhance the implementation of Standard Operational Procedures about Occupational Safety and Health (K3) while also ensuring the continuous provision of comprehensive Personal Protective Equipment (PPE) for all employees
Investment analysis of solar power plant installation on the roof of the central business district office building with the best investment value Soejanto, Irwan; Poerbaningrat, Raden Muhammad Nalindra; Ristyowati, Trismi; Puryani, Puryani
OPSI Vol 17 No 1 (2024): 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.v17i1.11233

Abstract

The Central Business District (CBD) office building is making efforts to reduce building electricity costs, and one alternative is solar power plant installation. PT. Rancang Prima Sejahtera, engaged in the solar energy industry, conducts consulting services with Central Business District office buildings, so PT. Rancang Prima Sejahtera made an indicative proposal with several solar power plant installation scenarios to be installed on the roof of the Central Business District office building. Four scenarios are created from the combination of 2 PV modules and two inverters. Each scenario created will be assessed for the level of opt, and the investment value will be calculated. In combining components using the principles of the Vereun Deutsche Ingineuer (VDI) 2222 method and assessed each scenario using six aspects of assessment.Meanwhile, the investment analysis assessment uses the parameters of Cost of Energy (CoE), Net Present Value (NPV), Internal Rate of Return (IRR), Benefit-Cost Ratio (B-CR), and discounted payback period. The results of the analysis conducted found that the third scenario was the best scenario with a percentage of the design value of 82.5%, CoE value of Rp398.31/kWh, NPV value of Rp2,451,719,005, IRR percentage of 23.75%, B-CR value of 7.8, and DPP value for 6.8 years with a project life of 30 years. The findings of the investment research indicate that the implementation of solar power plant installations in office buildings located in Central Business Districts yields long-term cost reductions in electricity expenses over a 30-year period, as opposed to relying solely on the services provided by the State Electricity Enterprise.

Page 23 of 26 | Total Record : 255

 21   22   23   24   25 

Filter by Year

2016 2025


Reset
Filter By Issues
All Issue Vol 18 No 1 (2025): OPSI - June 2025 Vol 17 No 2 (2024): ISSN 1693-2102 Vol 17 No 1 (2024): ISSN 1693-2102 Vol 17, No 1 (2024): ISSN 1693-2102 Vol 16 No 2 (2023): ISSN 1693-2102 Vol 16, No 2 (2023): ISSN 1693-2102 Vol 16, No 1 (2023): ISSN 1693-2102 Vol 15, No 2 (2022): ISSN 1693-2102 Vol 15, No 1 (2022): ISSN 1693-2102 Vol 14, No 2 (2021): ISSN 1693-2102 Vol 14, No 1 (2021): ISSN 1693-2102 Vol 13, No 2 (2020): ISSN 1693-2102 Vol 13, No 1 (2020): ISSN 1693-2102 Vol 12, No 1 (2019): ISSN 1693-21020 Vol 12, No 2 (2019): ISSN 1693-2102 Vol 12, No 1 (2019): ISSN 1693-2102 Vol 11, No 2 (2018): ISSN 1693-21020 Vol 11, No 2 (2018): ISSN 1693-2102 Vol 11, No 1 (2018): ISSN 1693-2102 Vol 10, No 2 (2017): ISSN 1693-2102 Vol 10, No 1 (2017): ISSN 1693-2102 Vol 9, No 01 (2016): ISSN 1693-2102 Vol 9, No 2 (2016): ISSN 1693-2102 More Issue