Theoretical and experimental performance evaluations of Picoframe framing cameras

Author(s):  
David R. Walker ◽  
Wilson Sibbett ◽  
Yueping Liu
2011 ◽  
Vol 45 (26) ◽  
pp. 2773-2781 ◽  
Author(s):  
Ki-Yeon Park ◽  
Jae-Hung Han ◽  
Jin-Bong Kim ◽  
Sang-Kwan Lee

Two-layered radar-absorbing structures (RASs) were investigated for the broadband absorbing characteristics for the X-band (8.2–12.4 GHz) and Ku-band (12.0–18.0 GHz). E-glass/epoxy plain weave composites containing carbon nanofibers (CNFs) and submicron NiFe particles were fabricated and their complex permittivities and permeabilities measured in the range 2–18 GHz. The surface and absorbing layers of two-layered RASs consisted of the low and high lossy materials, respectively. Six kinds of two-layered RASs were designed through the parametric studies. The three kinds of specimens with wide absorption characteristics were selected for the experimental performance evaluations, and their results showed very broad 10 dB absorbing bandwidths of 8.9–9.7 GHz with thicknesses 3.15–3.43 mm.


IEEE Access ◽  
2018 ◽  
Vol 6 ◽  
pp. 21287-21295 ◽  
Author(s):  
Ricardo De Andrade ◽  
Kleber N. Hodel ◽  
Joao Francisco Justo ◽  
Armando M. Lagana ◽  
Max Mauro Santos ◽  
...  

1997 ◽  
Vol 40 (4) ◽  
pp. 900-911 ◽  
Author(s):  
Marilyn E. Demorest ◽  
Lynne E. Bernstein

Ninety-six participants with normal hearing and 63 with severe-to-profound hearing impairment viewed 100 CID Sentences (Davis & Silverman, 1970) and 100 B-E Sentences (Bernstein & Eberhardt, 1986b). Objective measures included words correct, phonemes correct, and visual-phonetic distance between the stimulus and response. Subjective ratings were made on a 7-point confidence scale. Magnitude of validity coefficients ranged from .34 to .76 across materials, measures, and groups. Participants with hearing impairment had higher levels of objective performance, higher subjective ratings, and higher validity coefficients, although there were large individual differences. Regression analyses revealed that subjective ratings are predictable from stimulus length, response length, and objective performance. The ability of speechreaders to make valid performance evaluations was interpreted in terms of contemporary word recognition models.


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