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Silk, James D.

Works: 9 works in 9 publications in 1 language and 7 library holdings
Roles: Author
Classifications: UF810,
Publication Timeline
Publications about James D Silk
Publications by James D Silk
Most widely held works by James D Silk
A model of false alarms in target acquisition by human observers by James D Silk( Book )
1 edition published in 1995 in English and held by 0 libraries worldwide
A Model of False Alarms in Target Acquisition by Human Observers ( file )
1 edition published in 1995 in English and held by 0 libraries worldwide
The modeling of target acquisition by human observers has focused on the problem of predicting whether targets will be detected. The closely related issue of false alarm prediction has received less attention. While predicting false alarms is secondary to true detection, it is nevertheless important to understand the effects of false alarms and to account for them in the development of doctrine. In this work we extend the scope of target acquisition modeling to the consideration of false detections. The model is based on the analysis of data obtained in a series of target acquisition tests. It is phenomenological in the sense that it seeks only to describe the results of the tests. An important finding from the analysis of the test data is that the dominant determinant of false alarm rate is the expectation of the human subject. A more general review of the test results reveals features that strongly suggest a description based on signal detection theory. Re-analysis of the test data in this context allows us to construct such a description and to extract the parameters that describe the observer ensemble. Finally, we demonstrate the correlation between the mean false alarm rate and a scene complexity statistic
Longbow Stationary Target Indicator Technical History ( file )
1 edition published in 2006 in English and held by 0 libraries worldwide
This internally funded Central Research Project recounts the technical history of the Longbow program from IDA's initial involvement in 1987 through events reported from Operation Iraqi Freedom in 2003. The upgrade of the Apache to the AH-64D model is generally accepted as a very successful program. Nevertheless, shortcomings of the fire-control radar's stationary target capability identified and documented throughout the program's history remained unaddressed. Further, these shortcomings, while documented in DoD publications, did not propagate to the operational Army by informing either training or tactics, techniques, and procedures
Unified Analytical Model of the Effect of Obscurants on Target Acquisition and Engagement Tasks ( file )
1 edition published in 1993 in English and held by 0 libraries 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
Modeling the Observer in Target Acquisition ( file )
1 edition published in 1997 in English and held by 0 libraries worldwide
Models of target acquisition by human observers are probabilistic. Two reasons for the indeterminate nature of the models are: (1) the observer ensemble includes individuals with varying levels of competence in target acquisition, and (2) the target acquisition process is itself (at least in part) a random process. Each of the two commonly used combat simulations, CASTFOREM and JANUS, assumes that (a different) one of these reasons completely accounts for the indeterminacy, and ignores the other. Although the distinction is irrelevant for the simple one-on-one case, it has recently been shown that the choice can profoundly affect the outcomes of more realistic many-on-many engagements. We propose a model in which target detection probability is a function of both a target statistic and an observer statistic. Our analysis of recently compiled observer test data validates the model and provides it with the correct quantitative balance between variations among observers and the inherently stochastic component of target acquisition. We provide a working simulation that precisely represents our model. The algorithm is suitable for insertion into the wargames; it builds on the approaches of its predecessors but requires only a small increase in complexity
Statistical and Modeling Uncertainties in the Thermal Target Acquisition Model Improvement Program (TAMIP) Predictions ( file )
1 edition published in 1995 in English and held by 0 libraries worldwide
We analyze the uncenainties that are associated with the Thermal Target Acquisition Model Improvement Program (TAMIP) target detection predictions. The deviations of the measured probabilities from the predicted ones are much smaller than for the previous model, but still exceed those that would be expected from the finite statistical samples. Therefore there is still some residual error in the prediction. We determine confidence limits on the predictor variable which are unbiased in the sense that they are accurate at both high and low detection probabilities. We validate the confidence interval using a second data set that was not used in the development of this phase of the target detection model
Statistical and modeling uncertainties in the thermal Target Acquisition Model Improvement Program (TAMIP) predictions by James D Silk( Book )
1 edition published in 1995 in English and held by 0 libraries worldwide
Vehicular Mounted Mine Detector (VMMD) Test of Neutron Activation Technology ( file )
1 edition published in 1999 in English and held by 0 libraries worldwide
This report discusses the results of a series of tests specific to the Thermal Neutron Analysis (TNA) detector being used by Computing Devices Canada (CDC) during the Vehicular Mounted Mine Detector (VMMD) ATD demonstrations conducted at Aberdeen Proving Ground (APG), Maryland, in June 1998 and at Socorro, New Mexico, in July 1998. A TNA-specific test plan was devised to address performance issues in a thorough and systematic manner; unfortunately, there were sufficient constraints such that the test plan was not implemented as designed. Instead, a much-abridged version was conducted at APG, and a still more limited version at Socorro. In addition to performance evaluation for both sites, we present detailed analysis of the APG data, where we found that the detectability of a mine did not seem to depend on either its burial depth or its nitrogen content. Furthermore, target signature variability dominated the test results, rather than background variability. Surprising results such as these must be treated with caution, however, given the extremely small data set that was available. We believe that it is in the Army's interest to pursue these issues with a more thorough test, such as the one originally proposed which appears in the Appendix of this report
The Organization and Management of the Nuclear Weapons Program ( file )
1 edition published in 1997 in English and held by 0 libraries worldwide
The Department of Energy was required by the Congress to conduct a study of how it manages the nuclear weapons program, to include an analysis of the functions performed at Headquarters Defense Programs, operations offices, and applicable area and site offices. IDA was asked by the Deputy Secretary and the Assistant Secretary for Defense Programs to conduct this study. It contains an analysis of findings and options for making changes to management and organizational structures. Among the findings are that: review and approval processes for environment, safety, and health matters are broken; there are too many people; more attention needs to be paid to be expertise and training of DOE's employees; there is a lack of clarity regarding the roles of line vs. staff; the integration of programs and functions across DOE is weak; and the link between resources and requirements is broken. The study suggests a set of management principles upon which to reorganize. It then suggests a set of baseline reforms for reengineering ES & H and other processes. Finally, a set of options are provided for reorganizing the Defense Programs organization itself
English (9)
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