A Dynamic Analysis Environment (DAE) software package is introduced to facilitate group inclusion/exclusion method testing, evaluation and comparison for pre-detonation nuclear forensics applications. Employing DAE, t...
详细信息
A Dynamic Analysis Environment (DAE) software package is introduced to facilitate group inclusion/exclusion method testing, evaluation and comparison for pre-detonation nuclear forensics applications. Employing DAE, the multivariate signatures of a questioned material can be compared to the signatures for different, known groups, enabling the linking of the questioned material to its potential process, location, or fabrication facility. Advantages of using DAE for group inclusion/exclusion include built-in query tools for retrieving data of interest from a database, the recording and documentation of all analysis steps, a clear visualization of the analysis steps intelligible to a non-expert, and the ability to integrate analysis tools developed in different programming languages. Two group inclusion/exclusion methods are implemented in DAE: principal component analysis, a parametric feature extraction method, and knearestneighbors, a nonparametric pattern recognition method. Spent Fuel Isotopic Composition (SFCOMPO), an open source international database of isotopic compositions for spent nuclear fuels (SNF) from 14 reactors, is used to construct PCA and kNN models for known reactor groups, and 20 simulated SNF samples are utilized in evaluating the performance of these group inclusion/exclusion models. For all 20 simulated samples, PCA in conjunction with the Q statistic correctly excludes a large percentage of reactor groups and correctly includes the true reactor of origination. Employing kNN, 14 of the 20 simulated samples are classified to their true reactor of origination. (C) 2016 Elsevier B.V. All rights reserved.
The pilot ratings from at-sea dynamic interface launch/recovery flight tests of the HH-60H Seahawk helicopter have been modeled satisfactorily by an adaptive, nonparametric classification scheme. Results were compared...
详细信息
The pilot ratings from at-sea dynamic interface launch/recovery flight tests of the HH-60H Seahawk helicopter have been modeled satisfactorily by an adaptive, nonparametric classification scheme. Results were compared against those from three popular pattern classification tools and confirmed the authors' choice of algorithm. The resulting pilot rating classification model has also been used to evaluate the sensitivity to the 13 dependent parameters that include ship, aircraft, and environmental conditions.
暂无评论