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Jurnal Optimasi Sistem Industri

JOSI
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Published by Universitas Andalas

ISSN : 20884842 EISSN : 24428795 DOI : -

Control & Systems Engineering Decision Sciences, Operations Research & Management Engineering Industrial & Manufacturing Engineering Mechanical Engineering

Jurnal Optimasi Sistem Industri (JOSI) is a peer-reviewed journal that is published periodically (April and October) by the Department of Industrial Engineering, Faculty of Engineering, Universitas Andalas, Padang.

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Articles 394 Documents

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Dynamic Scoring and Costing in the Orienteering Problem: A Model Based on Length of Stay Giovano Alberto; Carles Sitompul
Jurnal Optimasi Sistem Industri Vol. 22 No. 2 (2023): Published in December 2023
Publisher : The Industrial Engineering Department of Engineering Faculty at Universitas Andalas

In today's travel and tourism landscape, the role of travel agents has become increasingly complex as they are challenged to explore a variety of potential destinations. More specifically, the complicated task of planning itineraries that truly satisfy travellers puts travel agents in a crucial role, increasing the complexity of itinerary planning. This complexity is compounded not only by the multitude of possible destinations, but also by non-negotiable constraints such as cost and time. To address these challenges, the orienteering problem represents a fundamental mathematical model that provides a theoretical basis for understanding the nuanced difficulties faced by travel agents.This study ventures into a novel iteration of the orienteering problem, with a particular focus on optimizing travel satisfaction based on length of stay. A notable aspect of this variant is the inclusion of time and cost constraints in the route determination process. Using an integer programming model, the satisfaction scores for each location are described by a diminishing returns function linked to length of stay, while the costs associated with each location follow a linear function influenced by the same parameter. The application of this model is in a hypothetical scenario with 32 nodes, with the calculations facilitated by the FilMINT solver. A sensitivity analysis examines time and cost constraints and shows their decisive influence on the optimization of travel routes. The results of this research contribute significantly to a strategic framework and provide travel agencies with the opportunity to create itineraries that not only meet practical limits but, more importantly, increase traveller satisfaction.

Investigation of Lower Limb Fatigue on Two Standing Posture Sari Julia Sartika; Siti Zawiah Dawal
Jurnal Optimasi Sistem Industri Vol. 11 No. 1 (2012): Published in 1st April 2012
Publisher : The Industrial Engineering Department of Engineering Faculty at Universitas Andalas

The purpose of this study was to investigate the different effect from the two standing posture on lower limb fatigue and discomfort. Sixteen subjects (eight females and eight males), aged between 23-29 years, participated in the experiment. They performed a sorting task in front of a grading table by picking and placing objects for 90 minutes in two posture (1) standing and (2) standing using a footrest. Muscle activity was recorded with surface EMG through disposable electrodes. The result shows that standing for ninety minutes developed fatigue in lower limb muscles and back muscles that lead to low back pain. Standing using a footrest result proper posture for prolonged standing period and reduce force at the back. It also results less fatigue and reduce the %MVC of EMG. So, it is recommended to attach a footrest in standing workstation to reduce the fatigue and discomfort.Keywords:fatigue, posture, standing,lower limb, EMG

Pengaruh Budaya Organisasi dan Lingkungan Kerja terhadap Kepuasan Kerja dan Kinerja Karyawan Rizki Wahyuniardi; Sidik Nurjaman; Muhamad Rafi Ramadhan
Jurnal Optimasi Sistem Industri Vol. 17 No. 2 (2018): Published in October 2018
Publisher : The Industrial Engineering Department of Engineering Faculty at Universitas Andalas

Perusahaan Listrik Negara (PLN) is a public company engaged in serving electricity in Indonesia. The company is a state-owned company which has a lot of human resources both from the level of general education up to the highest level of education. The rapid development of industrialization and technological innovation makes the company must be more competitive in facing the increasing of fierce competition in the current era of globalization. This study aims to analyze and prove the influence of organizational culture and work environment on employee performance through job satisfaction as a mediator or as an intervening variable. The study was conducted at PT. PLN (PERSERO) Distribution West Java Area Majalaya. Data were collected using questionnaires distributed to 146 employees and analyzed using Structural Equation Modeling (SEM) which was run by using AMOS 21.0 software. The results show that the organizational culture and work environment of PLN West Java Distribution Area Majalaya have a positive and significant influence on job satisfaction. Furthermore, the organizational culture, work environment, and job satisfaction of PLN employees have a positive influence on employee performance.

Application of the Total Productive Maintenance to Increase the Overall Value of Equipment Effectiveness on Ventilator Machines Hibarkah Kurnia; Andini Putri Riandani; Tri Aprianto
Jurnal Optimasi Sistem Industri Vol. 22 No. 1 (2023): Published in May 2023
Publisher : The Industrial Engineering Department of Engineering Faculty at Universitas Andalas

This article has been corrected.

Model Zero-One Linear Programming untuk Penjadwalan Raw Mill dan Cement Mill Wirdianto, Eri; Arnes, Ericho Chandra
Jurnal Optimasi Sistem Industri Vol. 17 No. 1 (2018): Published in April 2018
Publisher : The Industrial Engineering Department of Engineering Faculty at Universitas Andalas

The scheduling of electrical energy usage during Peak Load Period (PLP) is a complicated problem that has been faced by PT Semen Padang after Indonesian Power Company (PLN) implemented the demarcation regulation of electrical energy usage during PLP (6:00 – 10:00 p.m.) which may not exceed 44.100 kWH. This regulation forces Production Department of PT Semen Padang to arrange the “on (1) or off (0)” schedule for the Raw Mills and Cement Mills during PLP. A Raw Mill or Cement Mill can be switched-off if the specified criteria are satisfied. Those criteria refer to the achievement of daily production targets, silo content at PLP, and the requirement for particular Raw Mill or Cement Mill to be off during those 4 hours of PLP. Meanwhile, the constraints are related to the length of machining hours of Raw Mill, Kiln or Cement Mill before preventive maintenance takes place. To solve this problem, a scheduling model for Raw Mills and Cement Mills on-off during PLP is then developed using a linear programming approach. The decision variables are the “on-off” state of Raw Mills and Cement Mills during PLP, while the objective function is to minimize the penalty expense of energy used during PLP. The developed scheduling model has the ability to solve the problem of the “on-off” assignment for Raw Mills and Cement Mills from Indarung II to Indarung V. This scheduling model can decrease the penalty of electrical energy expense during PLP from Rp. 3.07 billion to Rp. 1.79 billion.

Perbaikan Rancangan Kruk Ketiak untuk Penderita Cedera dan Cacat Kaki Alfadhlani Alfadhlani; Yumi Meuthia; Dolly Filius Valent
Jurnal Optimasi Sistem Industri Vol. 12 No. 2 (2013): Published in 1st October 2013
Publisher : The Industrial Engineering Department of Engineering Faculty at Universitas Andalas

Kruk merupakan tongkat/alat bantu berjalan untuk orang yang memiliki keterbatasan fisik karena cacat atau cedera, biasanya digunakan secara berpasangan untuk mengatur keseimbangan tubuh saat berjalan. Kruk biasanya terdiri dari dua jenis yaitu kruk ketiak (Axillary Crutch) dan kruk lengan bawah (Forearm Crutch). Kruk ketiak pada umumnya terbuat dari aluminium karena berat jenisnya yang relatif ringan, namun memiliki kekuatan mekanik yang relatif rendah, sehingga pada beberapa kasus kruk aluminium mengalami bengkok saat digunakan. Kruk ketiak yang diusulkan oleh [1] dan [2] kurang praktis untuk dibawa, penutup kruk yang licin dan mudah rusak, serta ketinggiannya yang tidak mudah diatur sesuai keinginan. Pada makalah ini dilakukan studi untuk mengusulkan alternatif material pengganti yang lebih kuat dan sekaligus mengatasi masalah kekurangan kruk yang diusulkan oleh peneliti sebelumnya. Material yang dipertimbangkan dalam kajian adalah aluminium, baja karbon, dan stainless steel. Material terpilih untuk diusulkan sebagai material pengganti adalah stainless steel, penggunaan material ini dapat mereduksi bobot kruk sebanyak 28,6% dari 1,75 kg menjadi 1,25 kg. Agar kruk praktis dibawa, diusulkan sistem geser dengan tiga komponen penyusun utama yaitu tiang penyesuai jangkauan, tiang utama dan tiang penyesuai ketinggian, dengan sistem ini kruk memiliki panjang yang bisa disesuaikan yaitu panjang minimal 100 cm dan panjang maksimal 150 cm. Tiang utama kruk dibagi menjadi dua bagian, panjang masing-masing tiang utama adalah 50 cm dan 45 cm sehingga lebih mudah dilipat untuk disimpan dan dibawa. Penutup ujung kruk menggunakan karet agar tidak licin, karet tersebut dimasukkan ke dalam pipa tiang utama sehigga lebih tahan terhadap tekanan. Pegangan kruk dirancang dengan kemiringan yang bisa disesuaikan, rasio penyesuaian kemiringan yaitu 14,4o agar posisi tangan dan pergelangan tangan lebih baik dan nyaman saat penggunaan, tetapi derajat kemiringan kruk rancangan ini masih lebih besar 2,4o jika dibandingkan dengan kemiringan yang ergonomis yaitu sebesar 12o.Keywords: kruk, cacat, cedera, ergonomis

Enhancing Operations for Sustainability in Indonesian SMEs through Climate Change Awareness and Business Orientation Hafiz Rahman; Sri Oktavia; Niyanta Shetye; Winny Leocade Sedjiro Azonhoumon
Jurnal Optimasi Sistem Industri Vol. 23 No. 1 (2024): Published in July 2024
Publisher : The Industrial Engineering Department of Engineering Faculty at Universitas Andalas

This study aims to identify the level of climate change awareness among small-medium scale entrepreneurs (SMEs) and to investigate its impact on future business orientation, with individual self-perception acting as a mediating variable. Addressing a significant gap in the literature, this research explores the reciprocal influence between SMEs and climate change—an area previously underexplored. Conducted in West Sumatra, Indonesia, this study employs a quantitative causal analysis approach using Structural Equation Modelling-Partial Least Squares (SEM-PLS) for robust analysis. The findings indicate that while awareness and self-perception of climate change among SMEs are low, they significantly influence potential changes in business orientation. The study reveals that although many SMEs possess a high level of educational attainment, this does not necessarily translate into heightened awareness or self-perception regarding climate change. This disconnect underscores the critical role of tailored educational initiatives and support systems to bridge the gap between knowledge and action. Additionally, the study finds that SMEs often prioritize immediate financial stability over long-term environmental sustainability, driven by the necessity to meet daily operational demands. These results underscore the urgent need for pre-emptive government policies to guide SMEs toward sustainable practices. Effective interventions should include financial incentives, technical assistance, and educational programs designed to enhance climate change awareness and capabilities among SMEs. Furthermore, this study contributes to the field of industrial engineering by identifying opportunities to optimize SME operations. By integrating environmental sustainability into business strategies, SMEs can enhance their resilience and competitiveness while contributing to broader environmental goals. This research advances the understanding of the dynamic interplay between SMEs and climate change, providing a foundation for future studies aimed at promoting sustainable industrial practices.

Technical Evaluation and Financial Analysis of a Retrofitting Investment Project for Production Machinery in a Cement Plant Taufik; Putri, Nilda Tri; Kevin, Muhammad
Jurnal Optimasi Sistem Industri Vol. 22 No. 2 (2023): Published in December 2023
Publisher : The Industrial Engineering Department of Engineering Faculty at Universitas Andalas

In today's rapidly evolving industrial landscape, businesses are increasingly challenged to strike a balance between enhancing productivity and maintaining product quality. Company X, a renowned cement manufacturer in Indonesia, relies heavily on four key raw materials, among which clay is particularly crucial for the raw mix. Recent trends have shown a decrease in the Al2O3 composition of clay, necessitating adjustments in clay capacity to uphold quality standards. A thorough technical evaluation of the plant highlighted that a significant number of critical machines, totaling 17, were operating with mechanical availability below the desired threshold. Additionally, a utility analysis pinpointed a shortfall in meeting the required clay tonnage, leading to the identification of machines that would benefit from retrofitting. The financial implications of this initiative were substantial, with the initial investment for the upgrades and subsequent operational costs in the first year being considerable. Yet, this expenditure was offset by a notable profit in the first year post-retrofitting. Key financial metrics further underscored the project's viability: a highly favorable Net Present Value (NPV), an impressive Internal Rate of Return (IRR), a rapid Payback Period (PP), and a significant Profitability Index (PI). These parameters, derived from an exhaustive analysis, clearly support the strategic decision to invest in retrofitting the production machinery at Company X's cement plant, illustrating the project's feasibility and the prospective benefits of this investment.

Algoritma Penentuan Ukuran Batch Integer pada Penjadwalan Flowshop Satu Mesin Hadigufri Triha; Ahmad Syafruddin Indrapriyatna; Jonrinaldi Jonrinaldi; Berry Yuliandra
Jurnal Optimasi Sistem Industri Vol. 15 No. 1 (2016): Published in March 2016
Publisher : The Industrial Engineering Department of Engineering Faculty at Universitas Andalas

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.

Aplikasi Penentuan Rute Distribusi LPG 3 Kg Difana Meilani; Arefa Iswara
Jurnal Optimasi Sistem Industri Vol. 17 No. 2 (2018): Published in October 2018
Publisher : The Industrial Engineering Department of Engineering Faculty at Universitas Andalas

PT IB. Sumberdaya Development is one of LPG agent partners of PT Pertamina. This company is assigned to distribute 3 kg LPG. The LPG shipment is carried out from Monday to Saturday. The shipment goes to 66 depots using agent vehicle which are registered in PT Pertamina. From the preliminary study, there were problems which related to the long-distance shipment, and the limitation of transportation and capacity. In this research, the shipment routes of 3 kg LPG in PT IB is determined. Sumberdaya Development problems consist of the distance of the travel, the time of travel, and optimal transportation cost. Based on Clarke and Wright Savings Matrix algorithm, by considering the vehicle capacity, the distance can be minimized. The point of this algorithm is calculating the saving by measuring the available reduction of distance and time. It is done by linking the existing depots and making a route which is based on the largest saving value of the distance from the agent to the destination depot. Each route is optimized by WIN QSB software by using Branch and Bound method. A program to facilitate the determination of shipment routes by using PHP programming language is designed. The proposed route for the 3kg LPG shipment is 762.35km with 33.58% saving, and the proposed time is 2929 minutes with 15.27% saving. The shipment schedule is designed from Monday to Saturday day to Saturday with each of 7 routes. This is better than the actual route used by the company.

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Rika Ampuh Hadiguna

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