Mark F. St. John

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This dissertation is the result of my own work and includes nothing which is the outcome of work done in collaboration, except where stated. It has not been submitted in whole or part for a degree at any other university. The length of this thesis including footnotes and appendices is approximately 36,000 words. i Summary This thesis details the development(More)
A parallel distributed processing model is described that learns to comprehend single clause sentences. Specifically, it assigns thematic roles to sentence constituents, disambiguates ambiguous words, instantiates vague words, and elaborates implied roles. The sentences are pre-segmented into constituent phrases. Each constituent is processed in turn to(More)
Research on when and how to use three-dimensional (3D) perspective views on flat screens for operational tasks such as air traffic control is complex. We propose a functional distinction between tasks: those that require shape understanding versus those that require precise judgments of relative position. The distortions inherent in 3D displays hamper(More)
How ore knowledge-intensive, text-comprehension processes computed? Specifically, how ore (1) explicit propositions remembered correctly, (2) pronouns resolved, (3) coherence and prediction inferences drown, (4) on-going interpretotions revised OS more information becomes available, and (5) informotion learned in specific contexts generalized to novel(More)
The Defense Advance Research Projects Agency Augmented Cognition program is developing innovative technologies that will transform human–computer interactions by making information systems adapt to the changing capabilities and limitations of the user. The first phase of the Augmented Cognition program was to empirically assess the ability of various(More)
Tactical displays can quickly become cluttered with large numbers of symbols that can compromise effective monitoring. Here, we studied how heuristic automation can aid users by intelligently "decluttering" the display. In a realistic simulated naval air defense task, 27 experienced U.S. Navy users monitored a cluttered airspace and executed defensive(More)
Detecting changes in complex monitoring tasks is important for situation awareness, yet surprisingly difficult. Interruptions exacerbate this problem. An intuitively appealing solution to this problem is Instant Replay. Users could replay interrupted periods at high speed to quickly perceive changes. Instant Replay’s appeal seems to rest on its familiarity(More)
IEEE Computer Graphics and Applications 51 Air-traffic controllers, military personnel, and others need displays that rapidly convey the location and other attributes of objects (such as aircraft) in 3D space. The ongoing revolution in the availability of inexpensive and fast 3D rendering technologies is allowing display designers to develop 3D prototype(More)
This paper reports on the quality of service (QoS) mapping mechanisms for converged OFDMA-PON and LTE networks to satisfy the stringent QoS requirements. Various options for exhibiting QoS mapping between the LTE bearers and optical OFDMA-PON queues have been presented. These include, wireless classes forwarded directly to one priority optical queue (so(More)
Effective and usable closed-loop attention management systems are on the cusp of reality. The purpose of a closedloop attention management system is to monitor an operator’s attention via psychophysiological indicators, predict episodes of low vigilance and lapses of attention, and then modify the system interface to maintain optimal levels of performance.(More)