Výsledky vyhledávání - "Thomas F. Johnston"

Beam propagation (m(2)) measurement made as easy as it gets: the four-cuts method

Autor: Thomas F. Johnston

Publikováno v: Applied optics. 37(21)

Tolerance analysis shows that an efficient M(2) measurement plan is a first cut (beam diameter measurement) at 0.5-2.0 Rayleigh ranges to one side of the waist, which is matched by interpolation between second and third cuts to the opposite side. The

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::caaeeec456ba8dbd18d60e9870fb5a95
https://pubmed.ncbi.nlm.nih.gov/18285945

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Pulsed xenon flashlamp device for the treatment of psoriasis

Autor: Eric B. Taylor, David R. Hennings, Thomas F. Johnston, Jonathan M. Baumgardner

Publikováno v: SPIE Proceedings.

We present our research into a pulsed xenon lamp source for the treatment of psoriasis and other skin disorders. Various filtering techniques, lamp configurations, power supply configurations and delivery systems are discussed. Comparisons are made t

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::66d12a3fccd2e43c49de8196bd7bad83
https://doi.org/10.1117/12.476142

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Measurement of the absolute accuracy (to <0.5%) of a clip-level beam profiler using Fresnel diffraction by a wide slit

Autor: John M. Fleischer, Thomas F. Johnston

Publikováno v: SPIE Proceedings.

By comparing the measured width of an optical test patten to the known width, the absolute error of a clip-level profiler is determined to be (-0.1 +/- 0.3)%. An expanded fundamental mode beam illuminates a pair of opposed knife edges (a wide slit) t

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::8dc94db09ce5b4fc0355e4688789afbe
https://doi.org/10.1117/12.206987

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Security issues in a satellite global GSM network

Autor: Thomas F. Johnston

Publikováno v: Information Security Technical Report. 4:11-12

The validity of messages being transmitted and received within the SS7 telecommunication networks worldwide can no longer be guaranteed. There is the potential for manipulation and replaying of messages to achieve undesired affects. Even though major

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::25d5cfcd9c45bcb62ca9260e5d295a07
https://doi.org/10.1016/s1363-4127(99)80029-6

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