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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 296 Documents
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Implementation of cleaner production in the refined sugar industry to reduce landfilling in waste management at sugar industry in Cilegon Prio Utomo; Fatah Sulaiman; Juwarin Pancawati
OPSI Vol 19 No 1 (2026): OPSI - June 2026
Publisher : Jurusan Teknik Industri, Fakultas Teknologi Industri UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/opsi.v19i1.15669

Abstract

Sugar Industry in this study  is a company located in Cilegon City, Banten Province, operating in the refined sugar industry. The objective of this study is threefold: first, to identify the flow of materials, products, and non-products in the refined sugar production process; second, to identify potential cleaner production alternatives applicable to the industry; and third, to determine the priority scale of cleaner production opportunities in the refined sugar industry. The research methods employed encompass a comprehensive array of approaches, including a thorough literature review, observational studies, environmental assessments, and comparative analyses. According to the findings of the research study, the total amount of waste generated in 2023 was 19,025.36 tons. Of this, 5,575.52 tons (29.3%) were landfilled, and 13,449.84 tons (70.7%) were reused by other industries. In 2024, the total waste generated was 16,579.35 tons, of which 16,568.44 tons were utilized by other industries as alternative fuel or alternative raw materials, and a mere 10.91 tons were sent to landfill. According to the 2024 data, a mere 0.07% of the total waste was landfilled, while a staggering 99.7% was reused by other companies. The implementation of cleaner production and zero-landfill principles has the potential to repurpose the waste generated.
Optimization of steam utilization in palm oil refinery processes using Kaizen and design of experiment Arif Budi Sulistyo; Fikri Fadhilah
OPSI Vol 19 No 1 (2026): OPSI - June 2026
Publisher : Jurusan Teknik Industri, Fakultas Teknologi Industri UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/opsi.v19i1.15694

Abstract

This research investigates the optimization of steam consumption in the refinery process of palm oil production. Excessive steam usage during the drying stage of Spent Bleaching Earth (SBE) has resulted in higher production costs and oil content levels that do not meet company targets. To address this issue, Kaizen's continuous improvement cycle and the Design of Experiment (DOE) method were applied. Data collection involved field observation, operator interviews, and documentation, which were analyzed using Pareto diagrams and checksheets. The improvement focused on adjusting the SBE drying time as a key parameter influencing both steam usage and oil content. Prior to improvement, the drying process required 850 seconds per cycle, consuming 6,824 kg of steam per day, while producing an average oil content of 18.91%. After implementing DOE-based adjustments, the drying time was reduced to 700 seconds, decreasing steam consumption to 5,600 kg per day, a reduction of 1,224 kg/day (17.9%), and achieving an oil content of 21.03% within the company's target range of 20–22%. The study demonstrates that combining Kaizen and DOE provides an effective strategy for reducing energy usage while maintaining product quality.
An evaluation of life cycle assessment and cost-benefit analysis of an ecoprint fabric micro, small, and medium enterprise in Yogyakarta Lathiifah Thawafani; Bella Renata Valencia; Muhammad Achirudin Buchari; Arie Dwi Zarliansyah; Nur Mayke Eka Normasari; Sinta Rahmawidya Sulistyo; Yoshi Budiyanto
OPSI Vol 19 No 1 (2026): OPSI - June 2026
Publisher : Jurusan Teknik Industri, Fakultas Teknologi Industri UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/opsi.v19i1.15727

Abstract

The rapid growth of the fashion industry has led to the emergence of fast fashion, which often overlooks its environmental impacts. In contrast, environmentally conscious practices are being adopted by some enterprises, including an MSME located in Yogyakarta, Indonesia, specializing in ecoprint fabric production. To evaluate its environmental and economic performance, this study conducts a Life Cycle Assessment (LCA) and Cost-Benefit Analysis (CBA) focusing on green production, green transportation, and green packaging. LCA results show that the use of LPG in the steaming process has notable environmental impacts, particularly in fossil depletion (0.00076), climate change–human health (0.000359), and human toxicity (0.0000956). Based on these findings, Solar PV was evaluated as an improvement condition to reduce dependence on LPG and mitigate environmental impacts across several categories. However, human toxicity increased from 9.56E-05 to 0.00164, indicating environmental trade-offs throughout the life cycle. The CBA results indicate that the existing production system is economically feasible, with NPV of IDR 58,781,312, IRR of 9%, BEP of 2,136.34 units (IDR 534,084,829.96), Payback Period of 5.52 years, and BCR of 1.40. This implies that the project is already economically feasible under current LPG use, while the substitution with Solar PV further enhances its sustainability and overall benefits.
From standards to practice: Applying ISO/IEC 27005:2022 for information security risk management in regional water company Andi Hary Akbar; Heri Wijayanto; I Wayan Agus Arimbawa; Riza Prapascatama Agusdin; Andika Rifai; Athaya Rizqia Fitriani
OPSI Vol 19 No 1 (2026): OPSI - June 2026
Publisher : Jurusan Teknik Industri, Fakultas Teknologi Industri UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/opsi.v19i1.15917

Abstract

Regional water companies have increasingly adopted information technology to support their operations. However, the absence of formalized information security risk management procedures can lead to substantial operational disruptions and financial losses. Therefore, this study aims to conduct a systematic risk assessment of a regional water company based on its IT assets, utilizing the ISO/IEC 27005:2022 standard. Data collection through semi-structured interviews and questionnaires with the company's IT department identified 31 assets, which were subsequently used for risk mapping and assessment. The assessment identified a total of 265 risk scenarios, categorized into 10 High (3.77%), 68 Medium (25.66%), and 187 Low (70.57%) level risks. Following the evaluation where all risks were deemed unacceptable, risk modification was recommended as treatment for all risk scenarios. Based on the results of the risk assessment, control recommendations were developed according to ISO/IEC 27001:2022 to assist the company in managing and mitigating risks. The implementation of the two ISO standards aligns to comprehensively map risks and provide a structured mitigation plan. These results are expected to assist the company in establishing formal risk management procedures and maintain business process continuity and effectiveness.
Proposed design of prosthetic arm with the integration of Kano model and TRIZ method Hapsoro Agung Jatmiko; Azmi Nur Dyah Rahmaningtyas; Fatma Hermining Astuti
OPSI Vol 19 No 1 (2026): OPSI - June 2026
Publisher : Jurusan Teknik Industri, Fakultas Teknologi Industri UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/opsi.v19i1.16334

Abstract

Individuals with upper-limb disabilities face substantial limitations in performing daily activities. Statistics Indonesia reports that 62.59% of persons with disabilities have physical impairments, while the Special Region of Yogyakarta ranks among the three provinces with the highest prevalence of finger and hand mobility disorders, at 0.44%. However, most available prosthetic devices remain primarily cosmetic and provide limited functional performance, leaving users’ needs and expectations unmet. This study aims to design a functional prosthetic hand that addresses user requirements and expectations by integrating the Kano model and the TRIZ (Teoriya Resheniya Izobretatelskikh Zadatch) method. The Kano model was applied to identify and classify user needs based on satisfaction levels, involving 15 individuals with upper-limb disabilities in Gunungkidul Regency. TRIZ was subsequently used to develop systematic and innovative design solutions. The proposed design emphasizes functionality, comfort, safety, ergonomics, ease of use, product quality, and aesthetic appearance. The design was validated through feedback from users and experts. Of the 13 respondents involved in the validation process, 11 agreed with the proposed design, while two recommended minor revisions to accommodate specific disability conditions. The final design consists of two prosthetic configurations: transhumeral and transradial prosthetic hands.
Effect of bottom front roller eccentricity on yarn unevenness (U%), mass variation (CV%), and hairiness in PV 30 ring spinning Dedy Harianto; Mokh Afifuddin; Siti Aisyah; Hendri Pujianto; Ratna Rosita Pangestika
OPSI Vol 19 No 1 (2026): OPSI - June 2026
Publisher : Jurusan Teknik Industri, Fakultas Teknologi Industri UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/opsi.v19i1.16458

Abstract

This study demonstrates that bottom front roller eccentricity in ring spinning negatively affects PV 30 yarn quality by increasing yarn unevenness (U%) and mass variation (CV%). Using a paired-sample experimental design and paired t-test analysis, the study evaluated yarn quality before and after corrective alignment of the bottom front roller under controlled mechanical and environmental conditions. Yarn unevenness decreased from 9.43 ± 0.20 to 8.55 ± 0.06, while yarn mass variation decreased from 11.87 ± 0.30 to 10.76 ± 0.10 after corrective alignment, indicating statistically significant improvements in drafting stability and yarn uniformity (p < 0.05) with a large practical effect size based on Cohen’s d analysis (Cohen’s d = 1.21). The bottom front roller was specifically investigated because it directly controls fiber movement within the drafting zone, where mechanical instability can generate irregular fiber tension and drafting waves. In contrast, no statistically significant effect on yarn hairiness was observed. From an industrial engineering perspective, the findings highlight the importance of preventive maintenance and precise roller alignment in reducing off-quality yarn production, minimizing material waste, and improving operational efficiency. Unlike previous studies that broadly examined drafting irregularities and machine vibration, this study specifically isolates the effect of bottom front roller eccentricity before and after corrective alignment under controlled operating conditions.
Analysis of subsidised fertiliser distribution efficiency using the lean thinking approach following the implementation of the zero ODOL policy: A case study of deliveries to Bojonegoro Regency Hally Hanafiah; Adhito Prabowo; Muhammad Ihsan; Tony Hendra Prasetya; Tony Kristhiofan; Mokhtar Abdullah
OPSI Vol 19 No 1 (2026): OPSI - June 2026
Publisher : Jurusan Teknik Industri, Fakultas Teknologi Industri UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/opsi.v19i1.16480

Abstract

The Zero Over Dimension Overload (Zero ODOL) policy, regulated by Minister of Transportation Regulation No. 60 of 2019, significantly impacted fertiliser distribution, decreasing truck transport capacity by 47%. This raised costs from Line I to Line III Bojonegoro Warehouse to Rp 26.2 billion annually. This study identifies inefficiencies and improvements using Lean Thinking with tools like Pareto Analysis, Ishikawa Diagram, and 5w+2 h. Manual loading and unloading caused waste through waiting, unproductive movements, defects, and repetition. The solution adopts pallets and forklifts to cut reliance on labour. Validated through a one-month operational pilot project managing 2,370 tonnes of fertiliser, Lean implementation structurally improved efficiency: logistics costs dropped to Rp 21 billion (20% savings), loading/unloading speed tripled from 250 to 750 tonnes/day, fertiliser damage reduced to 0.002%, and quantitative stakeholder satisfaction increased significantly. Lean delivers cost savings and enhances quality, safety, and sustainability amidst Zero ODOL challenges.
Barriers and drivers of sustainable hotel implementation: A systematic review Salsabila Shafia Dyaninta; Sinta Rahmawidya Sulistyo; Yun Prihantina Mulyani
OPSI Vol 19 No 1 (2026): OPSI - June 2026
Publisher : Jurusan Teknik Industri, Fakultas Teknologi Industri UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/opsi.v19i1.16483

Abstract

Sustainability is becoming progressively important in the hospitality industry, especially in the implementation of sustainable practices in hotels. This study is a systematic literature review (SLR) that aims to explore the barriers and drivers of sustainable hotel implementation across four key pillars: economic, social, environmental, and cultural. The paper synthesizes existing studies from 2020 to 2026 to identify factors that hinder and promote sustainability in hotels. Barriers include financial constraints, lack of awareness, and complex regulations, while drivers such as cost savings, improved guest experiences, and government incentives play significant roles. The analysis suggested potential strategies to help hotels navigate these barriers and utilize key drivers to reach sustainability. The mapping of potential strategies highlights the need for integrated policies, employee training, and technology investments. The study demonstrates that stakeholder engagement in facing challenges is key to the successful implementation of sustainability in hotels. The implications of this research are essential for guiding hotel management, policymakers, and society in building and supporting sustainable practices within the hospitality industry.
Current performance standard of circular product design: A systematic literature review Sri Indrawati; Subagyo Subagyo; Agus Darmawan
OPSI Vol 19 No 1 (2026): OPSI - June 2026
Publisher : Jurusan Teknik Industri, Fakultas Teknologi Industri UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/opsi.v19i1.16546

Abstract

The rising number of green customers has encouraged industries to assess product consequences. As a result, there has been an alignment of product development focus with regards to circular economy concepts. Consequently, several methods and tools have been developed, and thus new performance standards were introduced for product development. Nevertheless, there still exist deficiencies in industry-wide acceptance and adoption within these standards. The objective of the study aims at examining and optimizing existing standards on Circular Product Design. A systematic literature review method will be adopted with three phases: identifying research on Circular Product Design using Preferred Reporting Items for Systematic Reviews and Meta-Analyses, developing approaches on designs, and examining standards on design performance. The result shows that there are seven prevailing approaches on designs for Circular Product Design. Moreover, this study contributes an a structured classification of CPD approaches and performance standards, thus dealing with the problem of fragmented knowledge and and serves as a basis for further frameworks and research on circular product performance.
A system dynamics model for energy transition: Substituting fossil fuels with renewable energy Joko Sulistio; Winda Nur Cahyo; Daffa Alamsyah; Danang Setiawan
OPSI Vol 19 No 1 (2026): OPSI - June 2026
Publisher : Jurusan Teknik Industri, Fakultas Teknologi Industri UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/opsi.v19i1.16581

Abstract

This study develops a system dynamics model to examine Indonesia's transition from conventional energy to renewable energy. The risk of transition planning fails when the reciprocal relationship between market profitability and investor behavior is poorly considered. The model is built on PowersimStudio 10, representing conventional and renewable energy as stocks connected by bidirectional and interacting substitution flows. The probability of substitution is determined by the relative willingness to invest, which is influenced by a leveledenergy and electricity purchase agreement. Although these parameters are hypothetical, they are based on relevant literature and developed in the context of Indonesian energy. The simulation results show that the transition follows three phases: initial acceleration, stabilization, and dynamic equilibrium. Sensitivity analysis showed that the elasticity of substitution alone did not determine the speed of the transition. The rapid shift only occurs when renewables become more economically attractive than conventional energy. High elasticity is not enough when fossil energy remains economically dominant. The model is intended to provide a conceptual framework for understanding how economic competitiveness, policy signals, and investor behavior together shape the dynamics of the energy transition. Its structure can help identify the policy conditions needed to strengthen the adoption of renewable energy.

Page 29 of 30 | Total Record : 296

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