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Nicoll, Jeffrey F.

Works: 6 works in 8 publications in 1 language and 8 library holdings
Roles: Author
Classifications: UF810,
Publication Timeline
Publications about Jeffrey F Nicoll
Publications by Jeffrey F Nicoll
Most widely held works by Jeffrey F Nicoll
A mathematical framework for an improved search model by Jeffrey F Nicoll( Book )
1 edition published in 1994 in English and held by 1 library worldwide
Search is currently modeled for DoD applications by a single exponential function. The two adjustable parameters are the time constant, t, characterizing the exponential; and the long time detection probability, P. Deficiencies of the classical model are: human performance data cannot typically be fit with a single exponent model; the probability of detection for short times is less than that predicted by the classical model; the effects of multiple targets and clutter can only be included by adjusting the two-model parameters, which is performed in an ad hoc manner and over-constrains the model. This paper introduces a neoclassical model that includes three processes: attending to the target, random wandering around the scene and attending to other targets/clutter. An expression involving three exponents associated with the three processes is derived and special cases are described. The new model provides uniform treatment of multiple targets and false detections and allows for the separate descriptions of multiple times scales within the search process. Searches can be separated into single region, field-of-view search, and multiple region, field-of-regard search. Field-of-view search can be further subdivided into long searches during which the observer may examine many targets and short searches which are completed after a few target examinations
IDA (Institute for Defense Analyses) Gamma-Ray Laser Annual Summary Report (1987). Investigation of the Feasibility of Developing a Laser Using Nuclear Transitions ( Book )
1 edition published in 1988 in English and held by 1 library worldwide
This report summarizes the IDA research effort in FY 1987 in investigating the feasibility of developing a gamma-ray laser
A search for understanding : analysis of human performance on target acquisition and search tasks using eyetracker data by Jeffrey F Nicoll( Book )
2 editions published in 1995 in English and held by 1 library worldwide
This paper provides an analysis of recent human field-of-view search performance experiments performed by the Night Vision Laboratory. The experiments used trained subjects in examining simulated infrared imagery and employed in the 4B experiment an eye-tracker to enable monItoring the subjects search process. The data will be analyzed in the context of a recently proposed extension of the standard or 'classical' human search model, called 'the neoclassical model.' The purpose of the analysis is to determine whether or not the assumptions underlying the neoclassical model and its detailed conclusions can be verified in actual experimental data. pg15. JMD
Unified analytical model of the effect of obscurants on target acquisition and engagement tasks by Jeffrey F Nicoll( Book )
2 editions published in 1993 in English and held by 1 library worldwide
Models of human search and target acquisition are typically based on the assumption of an independent glimpse probability leading to an exponential model of target acquisition probability. This can be extended to the case of obscurants which intermittently interrupt the line of sight to any point of the image field
An Algorithm Fusion Approach to IRST Signal Processing (Ill): Nongaussian-Corrected Filter Fusion ( file )
1 edition published in 1994 in English and held by 0 libraries worldwide
The reduction of background clutter in Infrared Search and Track (IRST) systems remains a challenging problem. False alarm inducing clutter is typically nonstationary and nongaussian and may not be adequately treated by linear matched filter techniques. Previously, we examined the simultaneous use of two filters, 'filter fusion', to reduce the false alarms. This method depends upon the assumption that the residuals of two sufficiently different filters will be uncorrelated. In the present work we make explicit use of the nongaussian character of the clutter, using a threshold that depends on the local nongaussian character. The introduction of a nongaussian correction often improves the performance of both linear and nonlinear filters, including the optimal linear filter constructed for the scene. Fusing the nongaussian adjusted filters gives a further increase in performance. The use of the nongaussian correction appears to increase the robustness of the filters and the filter fusion, i.e., the performance from frame to frame within a given scene and from scene to scene is consistently improved and made more regular
Central Research Project Report on Superconductivity (FY 1988). Part 2. Magnetic Field Gradiometer Tank Seeker ( file )
1 edition published in 1990 in English and held by 0 libraries worldwide
A feasibility study is described herein for the use of a magnetic field gradiometer SQUID sensor, as a tank seeker and guidance system. It was determined that an antitank missile could be guided by a gradiometer to the target if delivered into a 300-meter bucket with the tank at the center. Problems of ambiguity, multiple targets and decoys, both deliberate and accidental, are discussed with numerical examples
English (8)
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