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All Journal Journal of Engineering and Management in Industrial System Spektrum Industri
Nurbi, Rahma Sabilah
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Decision Sciences, Operations Research & Management Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology

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ANALYSIS OF MENTAL WORKLOAD ON FORKLIFT OPERATORS DUE TO CHANGES IN ENVIRONMENTAL LIGHT INTENSITY Nurbi, Rahma Sabilah; Sugiono, Sugiono; Nursasongko, Mega
JEMIS (Journal of Engineering & Management in Industrial System) Vol. 13 No. 1 (2025)
Publisher : Industrial Engineering Department, Faculty of Engineering, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jemis.2025.013.01.2

Abstract

Forklift operation in industrial and warehousing environments often exposes operators to frequent transitions between areas with contrasting light intensities. These abrupt changes in ambient brightness, particularly when moving between indoor and outdoor spaces, can impose significant cognitive demands on operators. This study investigates the impact of fluctuating environmental light conditions on the mental workload experienced by forklift operators and its potential implications for their performance, safety, and well-being. This study uses an experimental design using a driving simulator where respondents are given different light intensities to complete the designed tasks.  The findings reveal that sudden light fluctuations can temporarily impair visual acuity, depth perception, and contrast sensitivity, necessitating increased cognitive effort to maintain situational awareness, evaluate potential hazards, and navigate safely. Where the respondent's cognitive load was measured using the NASA-TLX questionnaire.  Furthermore, excessive brightness or glare can cause eye strain, fatigue, and discomfort, exacerbating mental workload. Elevated mental workload due to changing light conditions was found to be associated with diminished situational awareness, impaired decision-making abilities, decreased reaction times, and increased accident risks. Sustained cognitive effort to compensate for visual challenges also contributed to mental fatigue, potentially reducing productivity and operational efficiency. This study highlights the need for appropriate lighting designl modifications to mitigate the mental workload imposed by fluctuating light conditions in forklift operations.
Proposed Design Of Toy To Optimize The Brain Development Of Children Aged 3-5 Years Old Astuti, Rahmaniyah Dwi; Gandana, William Elian; Pujiyanto, Eko; Nurbi, Rahma Sabilah
Spektrum Industri Vol. 20 No. 1 (2022): Spektrum Industri - April 2022
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/si.v20i1.14

Abstract

Children and games are inseparable, especially during their childhood which is known as the golden age. This is the phase when they experience a very fast and significant brain growth and development under the influence of several factors such as the sensory, motor, and cognitive aspects. Therefore, this study aims to design a safe toy without hazardous materials to maximize the brain development of children aged 3 to 5 years in the sensory, motor, and cognitive aspects. The design was based on the Nigel Cross principle normally used to analyze the consumer needs and this led to the production of three different toys which include the hand puppet, board game, and puzzle. The toys’ specifications and features were obtained from questionnaires distributed online and data analysis. The materials used include velboa fabric for hand puppets while Polylactic Acid (PLA) was used for both the board game and puzzles and they were selected based on the evaluations conducted by 3 competent production stakeholders. In conclusion, it was discovered that the design was able to provide solutions and breakthroughs needed to maximize the brains of children in their golden age.
Co-Authors Gandana, William Elian Nursasongko, Mega Pujiyanto, Eko Rahmaniyah Dwi Astuti Sugiono Sugiono