Experimental study on visual detection for fatigue of fixed-position staff

Nie, Baisheng; Huang, Xingliang; Yang, Chen; Li, Anjin; Zhang, Ruming; Huang, Jinxin

doi:10.1016/j.apergo.2017.05.010

Cited by 23 publications

(23 citation statements)

References 50 publications

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“…As for the ocular measures, BR was chosen for the first variable since lower BR is associated with increases in cognitive demand. 46 Decrease in BR is also related to visual discomfort in many studies 47–49 in which ambient light levels present in the room are acknowledged to play an influential role on BR. BD was chosen as the second ocular variable.…”

Section: Methodsmentioning

confidence: 99%

Analysis of the relationship between daylight illuminance and cognitive, affective and physiological changes in visual display terminal workers

Öner

Kazanasmaz

Leccese

et al. 2019

Building Services Engineering Research and Technology

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This study explored the impact of daylight illuminance on cognitive load during visual display terminal use by means of various physiological, performance and subjective measures. Repeated-measures design was adopted to identify the impact of variations in daylight levels that were manipulated through the shading system configurations (shading-on; shading-off). A total of 30 subjects performed visual and cognitive demanding tests. Performance measures were supported by subjective data and eye-related measures during the experimental analysis. Results revealed that the use of a shading system had positive impact on sustained attention. Concerning ocular measures, percentage of eye closure values showed opposite tendencies among vigilance and sustained attention demanding tests. Eye aspect ratio-max and blink duration were significantly correlated with reported glare sensation. In all tests, eye aspect ratio-max was found significantly higher in lower illuminances. Search velocity was significantly correlated with ocular variables in higher illuminances whereas sustained attention showed an opposite trend. This, initially, explains that even slight differences in daylight illuminance might have distinctive effects on the relationship between different groups of assessment variables while measuring cognitive load. Secondly, it proves the significance of carrying out sensitive experiments in terms of both light levels and test characteristics. Practical application: The findings of this study could suggest that a practical application, the use of a shading device, might deliver an efficient solution on such a multifaceted question about the potential effects of luminous environment on the evaluation of cognitive load. Work environments might be considered as cognitively efficient if only the harmony of less mental effort, more satisfaction and less health problems exist, which together ultimately deliver higher work performance. In real-world work environments, application of such shading devices involves advantages not only for avoiding excessive daylight exposure or optimizing energy consumption, but also facilitating cognitive, affective and physiological processes of individuals.

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Section: Methodsmentioning

confidence: 99%

Analysis of the relationship between daylight illuminance and cognitive, affective and physiological changes in visual display terminal workers

Öner

Kazanasmaz

Leccese

et al. 2019

Building Services Engineering Research and Technology

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“…e overall model by weighted LS-SVM is formulated as [27] y v � C i�1 P iv y iv C i�1 P iv . (12) e ith weight coefficient of x v is calculated by P iv x iv � A 1 iv x 1 iv , A 2 iv x 2 iv , . .…”

Section: Radiotelephony Communicationmentioning

confidence: 99%

“…ese images are used to detect the fatigued state based on facial-features (such as movements of the eyes and mouth) [10,11]. Nie et al found the significant difference among the indicators before and after experiment the experimental subjects undergo fatigue [12]. ese indicators include eye closure time, percentage of eyelid closure (PERCLOS) value, frequency, and number of blinks.…”

Section: Introductionmentioning

confidence: 99%

A High-Precision Fatigue Detecting Method for Air Traffic Controllers Based on Revised Fractal Dimension Feature

Shen

Pan

Yan

2020

Mathematical Problems in Engineering

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As air traffic volume increases, the air traffic controller (ATC) fatigue has become a major cause for air traffic accidents. However, the conventional fatigue-detecting methods based on speech are neither effective nor accurate because the speech signals are nonlinear and complicated. In this paper, an ATC fatigue-detecting method based on fractal dimension (FD) is proposed. Firstly, a special speech database of ATC radiotelephony communications is constructed. These radiotelephony communications are obtained from Air Traffic Management Shandong Bureau of China. Then, speech signals implement a wavelet decomposition and FD calculation. The calculation result shows the significant difference among the FD of the speech signal before and after fatigue. Furthermore, a novel fatigue feature of the ATC based on the FD of speech is built. A series of experiments are conducted to detect the ATC fatigue with the fatigue feature comparison process and a support vector machine (SVM). The results show that the accuracy in detecting ATC fatigue based on FD was 92.82%, which are higher than the state-of-the art methods. The research provides a theoretical guidance for Air Traffic Management Authority on detecting ATC’s fatigue, while it may provide reference for the fatigue assessment in other professional fields of civil aviation.

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“…e main disadvantage of these monitoring techniques is that their intrusiveness usually results in aversion and disturbance to the ATC, which will reduce their accuracy. e rapid developments in speech recognition have resulted in vocal feature-based methods recently emerging as the preferred avenue for research into fatigue in ATCs [13]. Vocal features are convenient to collect and analyse, given that the main job of ATCs involves communicating with pilots via radiotelephony, and regulations specify that all voice records must be preserved for a certain period of time.…”

Section: Introductionmentioning

confidence: 99%

A High-Efficiency Fatigued Speech Feature Selection Method for Air Traffic Controllers Based on Improved Compressed Sensing

Yan

Mao

Shen

et al. 2021

Journal of Healthcare Engineering

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Air traffic controller fatigue has recently received considerable attention from researchers because it is one of the main causes of air traffic incidents. Numerous research studies have been conducted to extract speech features related to fatigue, and their practical utilization has achieved some positive detection results. However, there are still challenges associated with the applied speech features usually being of high dimension, which leads to computational complexity and inefficient fatigue detection. This situation makes it meaningful to reduce the dimensionality and select only a few efficient features. This paper addresses these problems by proposing a high-efficiency fatigued speech selection method based on improved compressed sensing. For adapting a method to the specific field of fatigued speech, we propose an improved compressed sensing construction algorithm to decrease the reconstruction error and achieve superior sparse coding. The proposed feature selection method is then applied to optimize the high-dimension fatigued speech features based on the fractal dimension. Finally, a support vector machine classifier is applied to a series of comparative experiments using the Civil Aviation Administration of China radiotelephony corpus to demonstrate that the proposed method provides a significant improvement in the precision of fatigue detection compared with current state-of-the-art approaches.

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Experimental study on visual detection for fatigue of fixed-position staff

Cited by 23 publications

References 50 publications

Analysis of the relationship between daylight illuminance and cognitive, affective and physiological changes in visual display terminal workers

Analysis of the relationship between daylight illuminance and cognitive, affective and physiological changes in visual display terminal workers

A High-Precision Fatigue Detecting Method for Air Traffic Controllers Based on Revised Fractal Dimension Feature

A High-Efficiency Fatigued Speech Feature Selection Method for Air Traffic Controllers Based on Improved Compressed Sensing

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