Development of driving fatigue strain index to analyze risk levels of driving activity

Development of driving fatigue strain index using fuzzy logic to analyze risk levels of driving activity

“…This article focused on the development of DFSI, which consists several steps that need to be passed through as the foundation for this development. Some of the steps are similar to those reported in the previous study of the authors . This section will give a brief explanation of the development of DFSI.…”

“…The first step in developing the DFSI was the acquisition of knowledge. The knowledge, which acts as the brain to process the input data and information received by the system, can be acquired by extracting, structuring, and organizing knowledge from one or more sources . In this study, the knowledge is acquired and achieved by conducting a presurvey, performing the real road test, reviewing the previous journals and articles, referring the guidelines and international standards from authorized organizations and bodies, and getting an expert opinion from ergonomist and engineer.…”

“…The input value of each fuzzy set is based on the risk criteria and risk levels of the risk factor as discussed in the previous study by the authors . For example, the input WBV of x = <0.315 m/s 2 belongs to partially to the fuzzy set ‘low acceleration’ as shown in Table .…”

“…The strain index is a semiquantitative parameter that results on the numerical score (SI score) that is believed to correlate with the risk levels of driving fatigue. This study is the extension and improvement from the author's previous study entitled ‘Development of Driving Fatigue Strain Index to Analyze Risk Levels of Driving Activity’ . In the previous study by the authors, the strain index was developed using the multiplicative interaction among the risk factors by representing the product of all multipliers that correspond to all risk factors .…”

“…This study is the extension and improvement from the author's previous study entitled ‘Development of Driving Fatigue Strain Index to Analyze Risk Levels of Driving Activity’ . In the previous study by the authors, the strain index was developed using the multiplicative interaction among the risk factors by representing the product of all multipliers that correspond to all risk factors . However, the proposed relationship between the risk rating criteria and the multipliers is subject to criticism as the ratings and multipliers are based on the author's professional judgment.…”