| Improving Complex Distributed Software System Availability Through Information Hiding |
26 Mar 2010 |
6 pages |
| Authors:
Li Wang; Yair Leiferman; Shangping Ren; Kevin Kwiat; Xiaowei Li; AIR FORCE RESEARCH LAB ROME NY INFORMATION DIRECTORATE
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 | For distributed software systems, ensuring their availability under intentional attacks is critical. Traffic analysis, conducted by the attacker, could reveal the protocol being carried out by the components. Furthermore, having inferred the protocol, the attacker can use the pattern of the messages as a guide to the most critical components. We thwart these directed attacks by using message forwarding to reduce traffic differences, thus diverge attackers from targeted attack to ... |
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| TRANSFER OF PATTERNS INTO HGCDTE BY PLASMA ETCHING THROUGH AN A-SI:H VACUUM-COMPATIBLE MASK, |
JAN 1998 |
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| Authors:
J. H. DINANN; J. D. BENSON; J. N. Johnson; R. E. HOLLINGSWORTH; C. DEHART; Li Wang; ARMY COMMUNICATIONS-ELECTRONICS COMMANDFORT BELVOIR VA NIGHT VISION AND ELECTRONICS SENSORS DIRECTORATE
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 | (U) THIS PAPER PRESENTS WHAT THE AUTHORS DESCRIBE AS A NOVEL APPROACH TO HGCDTE INFRARED FOCAL PLANE ARRAY FABRICATION. THE GOAL IS TO SHOW FEASIBILITY OF CARRYING OUT ALL EPITAXIAL GROWTH AND DEVICE PROCESSING STEPS WITHOUT REMOVING THE WAFER FROM THE PROTECTIVE ENVIRONMENT OF A MULTI-CHAMBER VACUUM SYSTEM. A HYDROGENATED AMORPHOUS SILICIN (A-SI:H) PHOTOMASK WAS FABRICATED FOR THE APPLICATION AND SILICON GROWN FILMS ARE DISCUSSED USING PLASMA ENHANCED CHEMICAL VAPOR ... |
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| Novel Measurement of Anisotropic Thermal Diffusivity, |
1998 |
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| Authors:
Zhong Ouyang; Feng Zhang; Li Wang; L. D. Favro; R. L. Thomas
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| We describe a method for the measurement of thermal diffusivity of anisotropic materials. The technique uses a single pulse of light from a flashlamp on the front surface of a slap of material, aprt of which is shadowed by a rectangular mask, By fitting the measured rear surface temperature distributions as a function of time and space to a theoretical model, we obtain the thermal diffusivities in three orthogonal directions. ... |
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| Quantitative Thermal Wave Imaging of Corrosion on Aircraft, |
1997 |
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| Authors:
Xiaoyan Han; L. D. Favro; Tasdiq Ahmed; Zhong Ouyang; Li Wang; Xun Wang; Feng Zhang; P. K. Kuo; R. L. Thomas
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| We describe the use of Pulse -echo thermal wave imaging to detect disbonding and corrosion on aircraft structures. Results from inspections in the FAA's ANC hanger will be presented, inlcuding the imaging of disbonded and/or corroded tear straps, doublers, and lap splices on metal structures. A method for quantitative estimates of the metal loss by corrosion will be described, and tested on calibration specimens.--This owrk was supported by the FAA ... |
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| Lock In Thermal Wave Imaging, |
1997 |
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| Authors:
Zhong Ouyand; Li Wang; Xun Wang; Feng Zhang; L. D. Favro; P. K. Kuo; R. L. Thomas
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| We will describe a vector lock-in thermal wave imaging technique which uses an infrared focal plane array camera operating in a snapshot mode. The frequency dependence of the resulting amplitude and phase images will be described. Electronic applications will be discussed. This research was sponsored by the NSF under Grant 9413375, and by the Institute for Manufacturing Reseach, Wayne State University. |
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| Thermal Wave Imaging of Disbonding and Corrosion on Aircraft, |
1996 |
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| Authors:
L.D. Favro; Tasdiq Ahmed; Xiaoyan Han; Li Wang; Xun Wang
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| Thermal wave imaging is emerging as a strong competitor to conventional nondestructive aircraft inspection techniques. Its strengths are in its ability to do rapid, wide-area, contactless imaging to detect corrosion and disbonding. It readily lends itself to the inspection of both metallic and composite aircraft structures. Recently, we have described the evolution of thermal wave hardware, and the role of the FAA's NDI Validation Center in that evolution. In this ... |
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| Thermal Wave Imaging of Aircraft Structures, |
1995 |
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| Authors:
L.D. Favro; T. Ahmed; Xiaoyan Han; Li Wang; Xun Wang
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| We describe the application of Pulse-echo thermal wave imaging to NDT of aging aircraft. This technique uses high-power photographic flash lamps as a heat source and an IR video camera as a detector. The flash lamps launch pulses of heat into the skin of the aircraft and the IR camera images the returning thermal wave reflections from subsurface defects. The system also include electronic hardware and software for carrying out ... |
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