July - September 1996, Volume 17, Number 3
NOTES
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Research and Development Updates
Basic Research
Investigation of Signal Characteristics Using the Continuous Wavelet Transform
J. Sadowsky
Applied Research
Development of Optical Filters Based on Photorefractive Materials
P. R. Schuster, J. A. Miragliotta, M. E. Thomas, and D. M. Rust
Astronomical Refraction
M. E. Thomas and R. I. Joseph
Development
Shared Aperture Technology Development
T. A. Axness, R. V. Coffman, B. A. Kopp, and K. W. O'Haver
Information Technology
Collaborative Virtual Prototyping
J. S. Lombardo, E. Mihalak, and S. R. Osborne
Systems Engineering
The Emerging Joint System of Systems: A Systems Engineering Challenge and Opportunity for APL
W. H. J. Manthorpe, Jr.
System Integration
Integration of the Evolved Seasparrow Missile into Ships of the NATO Seasparrow Consortium Navies
S. A. Hyer, J. J. Johnston, and C. L. Roe
Book Review
A Comprehensive Look at Flame Research
R. G. Gann
APL Awards
Awards for Publications and Research and Development
L. L. Maier-Tyler
In Memoriam
Chih Kung Jen - A Remembrance
W. G. Berl
Miscellanea
Publications, Presentations, and Colloquia
The cover: What are seemingly rock columns in a cavern are actually features of a time versus scale representation of a transient signal. The image was generated with a continuous wavelet transform using a Morlet wavelet (see the article by J. Sadowsky in this issue). The transform produces a complex image (i.e., each pixel has both intensity amplitude and phase). Phase is represented as saturation by black dots, and amplitude is represented as grayscale, where darker gray corresponds to higher amplitude. The horizontal direction in the image is time, and the vertical direction is scale; the smaller scale representing finer detail is at the top. The periodicity of the columns indicates frequency at the scale and is due to the phase of the complex image. (Cover illustration by Kenneth R. Moscati.)
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Editorial Board
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© 1996 by The Johns Hopkins University Applied Physics Laboratory
The Electronic Version of The Johns Hopkins APL Technical Digest was created by the Technical Publications Group (TIR).