Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 43 for “"drowsiness"”.
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Experimental evaluation of subjective ratings of drowsiness and development of drowsiness definitions
… an "accurate" operational definition of drowsiness. Drowsiness is difficult to define because it may involve many different indicators, such as different physiological measures. This thesis consists of two separate, but related, experiments to determine an optimal method of determining …
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Simulator study of the effects of cruise control, secondary task, and velocity-related measures on driver drowsiness and drowsiness detection
This study was conducted in an attempt to improve drowsiness detection in automobiles by examining velocity-related measures. These measures were also included in multiple regression-generated drowsiness detection algorithms to determine their contribution to detection accuracy. In addition, the …
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SINGLE-CHANNEL REAL-TIME DROWSINESS DETECTION BASED ON ELECTROENCEPHALOGRAPHY
<p>Drowsiness is considered as a major risk factor in workplace injuries and fatalities as much as alcohol. Drowsiness-related accidents tend to be catastrophic. The need of a reliable drowsiness detection system is arising today, as drowsiness is considered as a major cause for many accidents in …
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Modeling, Designing and Applying Machine Learning Algorithms for Driver Drowsiness Detection
<p>Driver drowsiness has been a significant hazard resulting in various traffic accidents. Therefore, monitoring this condition is crucial not only in alerting drivers, but also in avoiding fatal accidents. Many research studies propose new systems to reduce the number of drowsiness-related …
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A comparison of three subsidiary tasks used as driver drowsiness countermeasures
… physiological measures. Therefore, assuming that drowsiness can be detected, it becomes important to develop methods (countermeasures) by which drivers can regain and maintain alertness. The current study was thus undertaken in an attempt to evaluate three subsidiary tasks which differed only in …
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An investigation of low-level stimulus-induced measures of driver drowsiness
… driver characteristics to predict driver drowsiness. As a result, a reliable drowsy driver detection system has yet to be devised. Thus, the primary objectives of this research were to determine whether driving characteristics and response variables could be used to detect eyelid closure …
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The development and validation of algorithms for the detection of driver drowsiness
… could be used for the prediction of on-the-road drowsiness. Numerous driver-vehicle performance measures and secondary task performance measures were collected so that the predictability of several definitional measures of drowsiness could be tested. Twelve volunteer subjects were employed in the …
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Crash Risk and Mobile Device Use Based on Fatigue and Drowsiness Factors in Truck Drivers
… are limited, which are limited; fatigue and drowsiness limit attentional resources further. The purpose of the current research is to gain an understanding of the relationship between mobile device use (MDU), fatigue, through driving time and time on duty, and drowsiness, through time of day …
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Simulator test and evaluation of a drowsy driver detection system and revisions to drowsiness detection algorithms
… tones, advisory messages, alarm stimuli, and drowsiness countermeasures. Detection occurred if eye closure or lane excursion exceeded predetermined thresholds. Data were obtained from six sleep-deprived subjects who drove a motion base automobile simulator late at night. Each subject was …
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Correlation analysis between the EEG parameters and the parameters derived from ECG and Steering wheel related signals for driver drowsiness detection
… related parameters have been investigated for drowsiness detection in previous researches. EEG has been deemed as a reliable way to detect drowsiness; while the accuracy of using ECG or steering wheel related parameters for drowsiness detection is not as high as that of EEG’s but they have the …
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Development of models for detection of automobile driver impairment
… are driver impairment due to alcohol and drowsiness. Apparently, a relatively large percentage of these accidents occur because drivers are unaware of the degree to which they are impaired due to these sources. The purpose of this research was to develop models which could detect driver …
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Advisory and alarm stimuli optimization for a drowsy driver detection system
… detection algorithms would compute online drowsiness levels. If a driver's drowsiness level exceeds a predetermined threshold the system would proceed to stage two. At this point an initial advisory tone and a voice message would be played. If the driver does not respond, he or she would …
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Assessment of Drowsy-Related Critical Incidents and the 2004 Revised Hours-of-Service Regulations
… Facts, 2004; Traffic Safety Facts, 2001). Driver drowsiness is an important issue to consider when discussing CMVs. According to the FMCSA, over 750 people are killed and 20,000 people are injured each year due to drowsy CMV drivers (as cited in Advocates for Highway and Auto Safety, 2001). Driver …
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Conflict and adaptation: Identifying the markers of cognitive control in the transition from wakefulness to sleep
… tasks was only observed in the later stage of drowsiness. This suggests that conflict monitoring is more susceptible to reductions in alertness. Our results from Chapter 2 also provide further evidence for the ecological validity of the Hori scale as a way to classify of the sleep onset period …
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Systems approach to the design of locomotive fatigue management technologies
… and loss of lives. The challenge of detecting drowsiness nonintrusively stems from the absence of a single marker, and the existence of diverse signs and symptoms that collectively but not uniquely characterize it. Current alerters for locomotive cabs are inadequate partly because they a) often …
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Algorithms refinement and threshold determination for a drowsy driver detection system
… of algorithms for the detection of driver drowsiness. Specifically, the goal of the research has been to develop the best possible drowsiness-detection algorithms using measures that can be computed while a vehicle is in motion with minimal interference with the driver. The results of these …
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The effects of clobazam and lorazepam on patient's psychomotor performance and anxiety
Psychomotor performance, drowsiness and anxiety were measured in 70 anxious outpatients in a randomized double-blind, placebo- controlled trial comparing the 1,5 benzodiazepine clobazam (10 mg (two times a day) to lorazepam (1 mg two times a day). Carefully selected tests were administered …
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Evaluating the outcomes of cancer patients receiving palliative care in Botswana
… constipation (50.9%), dry mouth (69.8%), drowsiness (56.6%), poor mobility (54.7%) and worry (90.6%). The results showed that the difference was statistically significant between the two -time points for pain (z=2.707, p = 0.0068), shortness of breath (z=2.261, p=0.0238), nausea (z=3.275, …
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Improving the Quality of Life of Patients with Snoring and Obstructive Sleep Apnea through Intraoral Devices // Подобряване качеството на живот при пациенти с хъркане и обструктивна сънна апнея чрез интраорални апарати
… and the day - morning headaches, fatigue, severe drowsiness and difficulty concentrating. Sleep apnea is associated with an increased risk of cardiovascular disease, hypertension and traffic accidents due to strong daily somnolence. The high prevalence of sleep apnea the many unexplored questions …
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The relationship between moderate physical activities and sleep quality and quantity among persons with dementia
… (P=.021) as well as daytime napping (P=.000) and drowsiness (P=.015) were significantly correlated with activity level. Conclusion: The preliminary evidence from this study suggests that physical activity may be an important method of improving sleep in this population. This study will aid in the …
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