Bibliography: leaves 162-170. / An important facet of a person's self-concept is his expectations of his performance. If his expectations are excessively high and there is a significant gap between his aspirations and his accomplishments, the resulting sense of failure has a negative effect on his self-concept. It is likely that school principals, because of the idealism and sense of calling that is associated with human service professions, are particularly vulnerable to excessive self-expectations. Cherniss believed this to be a potential stressor because the threat of failure has more serious personal consequences for people who regard their work as a calling rather than a job. For those who view their work as a calling, their identity and self-esteem are related to a considerable extent to the successful accomplishment of their work. Dobson pointed to the dangers of achievement anxiety, manifested as a pervasive fear of failure, for 'perfectionists' who set unreasonably high standards which are beyond their capabilities. Levinson regarded intense self-criticism and internal dissatisfaction as part of the make-up of dynamic, motivated business executives, making them exceptionally vulnerable to feelings of failure.

This simulator-based study examined the use of conventional auditory warnings (tonal, non-verbal sounds) and auditory icons> (representational non-verbal sounds), alone and in combination with a dash-mounted visual display, to present information about impending collision situations to commercial motor vehicle operators. Brake response times were measured for impending front-to-rear collision scenarios under six display configurations, two vehicle speeds, and two levels of headway. Accident occurrence was measured for impending side collision scenarios under two vehicle speeds, two levels of visual workload, two auditory displays, absence/presence of mirrors, and absence/presence of dash-mounted iconic display. Subjective preference data was also obtained from participants. For both front-to-rear and side collision scenarios, auditory icons elicited significantly improved driver performance over conventional auditory warnings. Driver performance improved when collision warning information was presented through multiple modalities. Brake response times were significantly faster for impending front-to-rear collision scenarios using the longer headway criterion. The presence of mirrors significantly reduced the number of accidents for impending side collision scenarios. Subjective preference data indicated that participants preferred multi-modal displays over single-modality displays. A technique for systematically identifying, selecting, and evaluating candidate auditory icons was also developed. The potential exists to expand upon these developments, toward the goals of identifying appropriate auditory icons, improving operator performance, and developing information display techniques to effectively managing workload across multiple modalities. / Master of Science

Unmanned aerial systems (UASs) often require multiple human operators fulfilling diverse roles for safe and correct operation. Reliably designing the human interaction, autonomy, and decision making aspects of these systems requires the use of modeling. We propose a conceptual model that models human machine interaction systems as a group of actors connected by a network of communication channels. We present a simulation framework implemented in Java, with an optional XML model parser that can be analyzed using the Java Pathfinder (JPF) model checker. We propose two human workload metrics based on a taxonomy extracted from the relevant literature. Using the simulator to produce a workload profile over time for each human actor, we conducted a case study by modeling a UAS integrated into the National Airspace System. Additionally we adapted an existing cognitive workload metric to act as a baseline. The results of this case study were consistent with known workload events and the results of our baseline metric.

No description available.

With the development of technology, people's viewpoints of the automobile have shifted; instead of merely a means of transportation, the automobile has become a space in which a driver can still perform daily activities besides driving, such as communicating with other people, interacting with electronic devices, and receiving information. In the meantime, different ways of interaction have been explored. Among all the modalities, gestures have been considered as a feasible way for performing in-car secondary tasks because of their intuitiveness. However, few researches have been conducted in terms of subjects' cognitive load. This thesis has examined four gesture interfaces (air swipe, air tap, screen swipe, and screen tap), in terms of their effects on drivers' driving performance, secondary task performance, perceived cognitive load, and eye glance behavior. The result demonstrated that air gestures are generally slower than screen gestures with regard to secondary performance. Screen swipe gesture requires the lowest cognitive load while air swipe and screen tap gesture remain the same. Subjects in this study tend to prefer screen swipe gesture the most while prefer air tap gesture the least. However, there is no significant difference between air swipe and screen tap gesture. Although air tap gesture and screen tap gesture generated the largest amount of dwell times, no variance among the four gesture interfaces in driving performance has been found. The result indicated that even though air gestures are not limited by space, screen swipe in this study still seemed to be the most ideal way for performing in-car secondary task of music selection.

published_or_final_version / Electrical and Electronic Engineering / Doctoral / Doctor of Philosophy

published_or_final_version / Computer Science and Information Systems / Master / Master of Philosophy

Not available / text

No description available.

No description available.