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Jack C. Schryver

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Publications by Jack C. Schryver (bibliography)

1994

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Schryver, Jack C. (1994): Experimental Validation of Navigation Workload Metrics. In: Proceedings of the Human Factors and Ergonomics Society 38th Annual Meeting 1994. pp. 340-344.

“Advanced computer interfaces in the control room provide limited display area, and information is represented in large-scale display networks. Display navigation may generate disorienting effects, require additional resources for window management, and increase memory and data integration requirements. An experiment was conducted using an elementary Safety Parameter Display System for Pressurized Waler Reactors to validate fourteen proposed metrics of navigation workload. Participants were asked to monitor one or two parameters, and answer questions after navigating a prescribed distance in the network. Analyses of variance of a modified task load index and subscales (confidence, disorientation, effort) supported the claim that navigation of large-scale display networks can impose additional mental load. Eye-gaze and other objective metrics were not validated, indicating needs for more refined probes and data reduction algorithms.”

1993

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Goldberg, Joseph H. and Schryver, Jack C. (1993): Eye-Gaze Control of the Computer Interface: Discrimination of Zoom Intent. In: Proceedings of the Human Factors and Ergonomics Society 37th Annual Meeting 1993. pp. 1370-1374.

“An analysis methodology and associated experiment were developed to assess whether definable and repeatable signatures of eye-gaze characteristics are evident, preceding a decision to zoom-in, zoom-out, or not to zoom at a computer interface. This user intent discrimination procedure can have broad application in disability aids and telerobotic control. Eye-gaze was collected from 10 subjects in a controlled experiment, requiring zoom decisions. The eye-gaze data were clustered, then fed into a multiple discriminant analysis (MDA) for optimal definition of heuristics separating the zoom-in, zoom-out, and no-zoom conditions. Confusion matrix analyses showed that a number of variable combinations classified at a statistically significant level, but practical significance was more difficult to establish. Composite contour plots demonstrated the regions in parameter space consistently assigned by the MDA to unique zoom conditions. Peak classification occurred at about 1200-1600 msec. Improvements in the methodology to achieve practical real-time zoom control are considered.”

1987

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Schryver, Jack C. and Knee, Helmut E. (1987): Integrated Operator-Plant Process Modeling and Decision Support for Allocation of Function. In: Proceedings of the Human Factors Society 31st Annual Meeting 1987. pp. 815-819.

“Human operator simulation models can play an important information role in the allocation of functions in person-machine systems. A prototype simulation model system developed at ORNL is described in which a human operator model (INTEROPS) and a nuclear power plant (NPP) process model are dynamically integrated. INTEROPS is a cognitive / performance simulation model which is itself a dynamic integration of a SAINT task network model and a knowledge-based subsystem which reasons with uncertainty. Potential contributions of INTEROPS to NPP advanced control design are evaluated.”

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