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All Journal Jurnal Optimasi Sistem Industri Jurnal Keilmuan dan Aplikasi Teknologi Industri
Khoirul Muslim
Institut Teknologi Bandung
Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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Enhancing Above-Knee Prosthetic Design for Inclusive Workplaces: Ergonomic Considerations in Manual Material Handling Khoirul Muslim; Adinda Shafira; Rifko Rahmat Kurnianto; Sandro Mihardi; Auditya Purwandini Sutarto
Jurnal Optimasi Sistem Industri Vol. 24 No. 1 (2025): Published in June 2025
Publisher : The Industrial Engineering Department of Engineering Faculty at Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/josi.v24.n1.p102-120.2025

Abstract

Employment is crucial for economic sustainability and social inclusion, yet individuals with disabilities face significant barriers. Globally, only 44% of disabled individuals are employed compared to 75% of those without disabilities. Manual material handling (MMH) relies heavily on stability and control in demanding industries such as manufacturing and logistics. Such demands create challenges for individuals with above-knee prostheses, as most current designs focus on walking and do not adequately support the postural and load-bearing requirements of MMH tasks. This study aims to evaluate the performance of transfemoral prosthesis designs during MMH, analyzing the effects of container type, load mass, and their interaction on gait efficiency, discomfort, and stability. Eight male unilateral above-knee amputees (24–39 y) carried handled and handle-less boxes loaded from 4 to 10 kg in a randomised within-subject trial. Gait deviation, perceived discomfort, and steadiness were captured with self-report measures. Two-way analysis of variance analyses showed a significant container × load interaction: handle-less 10 kg loads produced the greatest lateral trunk lean toward the prosthetic side, whereas lighter handled loads minimised deviation. Increasing load also elevated discomfort in the back, waist, stump and contralateral arm and reduced perceived stability. Observed lateral lean and impact-related knee extension suggest three priority modifications: (1) add socket adduction within an ischial-containment design to improve femoral stabilisation, (2) increase knee-swing friction to soften terminal impact, and (3) fit dual-keel feet to cushion heel strike. Implementing these changes may reduce gait errors and fatigue, raising safe lifting capacity for transfemoral prosthesis users in MMH task. Nonetheless, the male-only sample may not capture gender-specificgait strategies; future trials should include female participants and a larger cohort to verify generalisability. These preliminary findings still offer insights into improving prosthetic designs to enhance safety, functionality, and inclusion in industrial MMH tasks.
Evaluasi Usability Prototipe Situs Pemesan Produk Air Minum Dalam Kemasan Menggunakan Metode Usability Testing Fidruzal Fahlevi; Khoirul Muslim
Jurnal Sains dan Teknologi: Jurnal Keilmuan dan Aplikasi Teknologi Industri Vol. 24 No. 2 (2024): Regular Issue
Publisher : SEKOLAH TINGGI TEKNOLOGI INDUSTRI PADANG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36275/79m6nh56

Abstract

Perkembangan teknologi dan peningkatan pengguna internet menyebabkan persaingan pasar juga turut meningkat, khususnya pada bidang marketing. Sebagai salah satu perusahaan yang tengah menghadapi tantangan tersebut, perusahaan air minum dalam kemasan (AMDK) CV Multirejeki Selaras mulai mengembangkan website pemesanan produk yang diharapkan dapat meningkatkan keunggulan kompetitif perusahaan. Akan tetapi, prototipe website belum pernah diuji, serta berdasarkan percobaan dengan pihak internal, masih terdapat kesulitan dalam menjalankan berbagai fitur pada prototipe. Penelitian ini bertujuan untuk mengevaluasi usability prototipe melalui metode usability testing, serta dengan pendekatan retrospective think-aloud (RTA) untuk menentukan rekomendasi perbaikan. Evaluasi dilakukan oleh 20 partisipan yang berpengalaman dengan perangkat digital, yang dibagi atas 2 kelompok, yaitu berdasarkan generasi dan jenis kelamin. Berdasarkan hasil penelitian, seluruh fitur yang diujikan dapat dikatakan efektif karena memiliki persentase keberhasilan >70%. Akan tetapi, fitur pemesanan produk sebagai distributor belum dapat dikatakan efisien karena waktu penyelesaian dan frekuensi kesalahan yang berbeda signifikan antar kelompok generasi, begitu juga pada fitur pemesanan produk sebagai pengguna biasa dengan frekuensi kesalahan berbeda signifikan antar kelompok jenis kelamin. Kemudian, hasil RTA menunjukkan 20 masalah yang perlu diprioritaskan untuk diperbaiki. Berdasarkan hasil evaluasi, ditentukan rekomendasi perbaikan untuk meningkatkan usability prototipe website dengan pendekatan concept generation.
Co-Authors Adinda Shafira Auditya Purwandini Sutarto Fidruzal Fahlevi Rifko Rahmat Kurnianto Sandro Mihardi