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A Light to the Nations: Messages from Isaiah. The 76th Annual Bible Lectures
146
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95
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Nelson - Probate Case, 1994
10
166 More
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Authentication techniques for smart cards
Smart card systems are most cost efficient when implemented as a distributed system, which is a system without central host interaction or a local database of card numbers for verifying transaction approval. A distributed system, as such, presents special card and user authentication problems. Fortunately, smart cards offer processing capabilities that provide solutions to authentication problems, provided the system is designed with proper data integrity measures. Smart card systems maintain data integrity through a security design that controls data sources and limits data changes. A good security design is usually a result of a system analysis that provides a thorough understanding of the application needs. Once designers understand the application, they may specify authentication techniques that mitigate the risk of system compromise or failure. Current authentication techniques include cryptography, passwords, challenge/response protocols, and biometrics. The security design includes these techniques to help prevent counterfeit cards, unauthorized use, or information compromise. This paper discusses card authentication and user identity techniques that enhance security for microprocessor card systems. It also describes the analysis process used for determining proper authentication techniques for a system.
Date:
February 1, 1994
Creator:
Nelson, R. A.
Object Type:
Article
System:
The UNT Digital Library
Automated fiber pigtailing technology
The high cost of optoelectronic (OE) devices is due mainly to the labor-intensive packaging process. Manually pigtailing such devices as single-mode laser diodes and modulators is very time consuming with poor quality control. The Photonics Program and the Engineering Research Division at LLNL are addressing several issues associated with automatically packaging OE devices. A furry automated system must include high-precision fiber alignment, fiber attachment techniques, in-situ quality control, and parts handling and feeding. This paper will present on-going work at LLNL in the areas of automated fiber alignment and fiber attachment. For the fiber alignment, we are building an automated fiber pigtailing machine (AFPM) which combines computer vision and object recognition algorithms with active feedback to perform sub-micron alignments of single-mode fibers to modulators and laser diodes. We expect to perform sub-micron alignments in less than five minutes with this technology. For fiber attachment, we are building various geometries of silicon microbenches which include on-board heaters to solder metal-coated fibers and other components in place; these designs are completely compatible with an automated process of OE packaging. We have manually attached a laser diode, a thermistor, and a thermo-electric heater to one of our microbenches in less than 15 minutes …
Date:
February 1, 1994
Creator:
Strand, O. T.; Lowry, M. E.; Lu, S. Y.; Nelson, D. C.; Nikkel, D. J.; Pocha, M. D. et al.
Object Type:
Article
System:
The UNT Digital Library
Automated solar cell assembly teamed process research. Semiannual subcontract report, 7 January 1993--30 June 1993
This report describes work done under Phase 3A of the PVMaT project to address problems that are generic to the photovoltaics (PV) industry. Crystalline silicon solar cells were used in the majority of all terrestrial power modules shipped in 1992. Spire`s analysis in Phase 1 of the PVMaT project indicated that the use of thin ({le}200-{mu}m) silicon cells can substantially reduce module manufacturing costs, provided that processing yields remain as high as they are now for processing standard thickness cells. Because present solar cell tabbing and interconnecting processes have unacceptably high yield losses with such thin cells, the objective of this Phase 3A subcontract is to use Spire`s light soldering technology and experience in designing and fabricating solar cell tabbing and interconnecting equipment to develop high yield throughput, fully automated processes for tabbing and interconnecting thin cells.
Date:
February 1, 1994
Creator:
Nowlan, M. J.; Hogan, S. J.; Darkazalli, G.; Breen, W. F.; Murach, J. M. & Sutherland, S. F.
Object Type:
Report
System:
The UNT Digital Library
An automated target recognition technique for image segmentation and scene analysis
Automated target recognition software has been designed to perform image segmentation and scene analysis. Specifically, this software was developed as a package for the Army`s Minefield and Reconnaissance and Detector (MIRADOR) program. MIRADOR is an on/off road, remote control, multi-sensor system designed to detect buried and surface-emplaced metallic and non-metallic anti-tank mines. The basic requirements for this ATR software were: (1) an ability to separate target objects from the background in low S/N conditions; (2) an ability to handle a relatively high dynamic range in imaging light levels; (3) the ability to compensate for or remove light source effects such as shadows; and (4) the ability to identify target objects as mines. The image segmentation and target evaluation was performed utilizing an integrated and parallel processing approach. Three basic techniques (texture analysis, edge enhancement, and contrast enhancement) were used collectively to extract all potential mine target shapes from the basic image. Target evaluation was then performed using a combination of size, geometrical, and fractal characteristics which resulted in a calculated probability for each target shape. Overall results with this algorithm were quite good, though there is a trade-off between detection confidence and the number of false alarms. This technology also …
Date:
February 1, 1994
Creator:
Baumgart, C. W. & Ciarcia, C. A.
Object Type:
Article
System:
The UNT Digital Library
AVLIS modified direct denitration: UO{sub 3} powder evaluation
The evaluation study demonstrated that AVLIS-enriched uranium converted to UO{sub 3} can be used to prepare UO{sub 3} pellets having densities in the range required for commercial power reactor fuel. Specifically, the program has demonstrated that MDD (Modified Direct Denitration)-derived UO{sub 2} powders can be reduced to sinterable UO{sub 2} powder using reduction techniques that allow control of the final powder characteristics; the resulting UO{sub 2} powders can be processed/sintered using standard powder preparation and pellet fabrication techniques to yield pellets with densities greater than 96% TD; pellet microstructures appear similar to those of power reactor fuel, and because of the high final pellet densities, it is expected that they would remain stable during in-reactor operation; the results of the present study confirm the results of a similar study carried out in 1982 (Davis and Griffin 1992). The laboratory processes were selected on the basis that they could be scaled up to standard commercial fuel processing. However, larger scale testing may be required to establish techniques compatible with commercial fuel fabrication techniques.
Date:
February 1, 1994
Creator:
Slagle, O. D.; Davis, N. C. & Parchen, L. J.
Object Type:
Report
System:
The UNT Digital Library
Barrier analogs: Long-term performance issues, preliminary studies, and recommendations
The US Department of Energy`s Hanford Protective Barrier Development Program is funding studies of natural analogs of the long-term performance of waste site covers. Natural-analog studies examine past environments as evidence for projecting the future performance of engineered structures. The information generated by analog studies is needed to (1) evaluate the designs and results of short term experiments and demonstrations, (2) formulate performance-modeling problems that bound expected changes in waste site environments, and (3) understand emergent system attributes that cannot be evaluated with short-term experiments or computer models. Waste site covers will be part of dynamic environmental systems with attributes that transcend the traits of engineered components. This report discusses results of the previously unreported preliminary studies conducted in 1983 and 1984. These results indicate that analogs could play an important role in predicting the long-term behavior of engineered waste covers. Layered exposures of glacial-flood-deposited gravels mantled with silt or sand that resemble contemporary barrier designs were examined. Bergmounds, another anomaly left by cataclysmic glacial floods, were also examined as analogs of surface gravel.
Date:
February 1, 1994
Creator:
Waugh, W. J.; Chatters, J. C.; Last, G. V.; Bjornstad, B. N.; Link, S. O. & Hunter, C. R.
Object Type:
Report
System:
The UNT Digital Library
The Baytown Sun (Baytown, Tex.), Vol. 72, No. 80, Ed. 1 Tuesday, February 1, 1994
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
February 1, 1994
Creator:
Dobbs, Gary
Object Type:
Newspaper
System:
The Portal to Texas History
[Beaumont Woman's Club, (auditorium)]
Photograph of the Beaumont Woman's Club in Beaumont, Texas.
Date:
February 1, 1994
Creator:
Texas Historical Commission
Object Type:
Photograph
System:
The Portal to Texas History
[Beaumont Woman's Club, (auditorium from stage, facing south)]
Photograph of the Beaumont Woman's Club in Beaumont, Texas.
Date:
February 1, 1994
Creator:
Texas Historical Commission
Object Type:
Photograph
System:
The Portal to Texas History
[Beaumont Woman's Club, (auditorium hallway, facing east)]
Photograph of the Beaumont Woman's Club in Beaumont, Texas.
Date:
February 1, 1994
Creator:
Texas Historical Commission
Object Type:
Photograph
System:
The Portal to Texas History
[Beaumont Woman's Club, (auditorium, pianos)]
Photograph of the Beaumont Woman's Club in Beaumont, Texas.
Date:
February 1, 1994
Creator:
Texas Historical Commission
Object Type:
Photograph
System:
The Portal to Texas History
[Beaumont Woman's Club, (auditorium stage, facing north)]
Photograph of the Beaumont Woman's Club in Beaumont, Texas.
Date:
February 1, 1994
Creator:
Texas Historical Commission
Object Type:
Photograph
System:
The Portal to Texas History
[Beaumont Woman's Club, (drawing room chandelier)]
Photograph of the Beaumont Woman's Club in Beaumont, Texas.
Date:
February 1, 1994
Creator:
Texas Historical Commission
Object Type:
Photograph
System:
The Portal to Texas History
[Beaumont Woman's Club, (drawing room, facing SE)]
Photograph of the Beaumont Woman's Club in Beaumont, Texas.
Date:
February 1, 1994
Creator:
Texas Historical Commission
Object Type:
Photograph
System:
The Portal to Texas History
[Beaumont Woman's Club, (foyer)]
Photograph of the Beaumont Woman's Club in Beaumont, Texas.
Date:
February 1, 1994
Creator:
Texas Historical Commission
Object Type:
Photograph
System:
The Portal to Texas History
[Beaumont Woman's Club, (foyer & drawing room, facing south)]
Photograph of the Beaumont Woman's Club in Beaumont, Texas.
Date:
February 1, 1994
Creator:
Texas Historical Commission
Object Type:
Photograph
System:
The Portal to Texas History
[Beaumont Woman's Club, (foyer, facing east)]
Photograph of the Beaumont Woman's Club in Beaumont, Texas.
Date:
February 1, 1994
Creator:
Texas Historical Commission
Object Type:
Photograph
System:
The Portal to Texas History
[Beaumont Woman's Club, (foyer, facing north)]
Photograph of the Beaumont Woman's Club in Beaumont, Texas.
Date:
February 1, 1994
Creator:
Texas Historical Commission
Object Type:
Photograph
System:
The Portal to Texas History
[Beaumont Woman's Club, (front entrance, facing west)]
Photograph of the Beaumont Woman's Club in Beaumont, Texas.
Date:
February 1, 1994
Creator:
Texas Historical Commission
Object Type:
Photograph
System:
The Portal to Texas History
[Beaumont Woman's Club, (front, facing west)]
Photograph of the Beaumont Woman's Club in Beaumont, Texas.
Date:
February 1, 1994
Creator:
Texas Historical Commission
Object Type:
Photograph
System:
The Portal to Texas History
[Beaumont Woman's Club, (front, facing west)]
Photograph of the Beaumont Woman's Club in Beaumont, Texas.
Date:
February 1, 1994
Creator:
Texas Historical Commission
Object Type:
Photograph
System:
The Portal to Texas History
[Beaumont Woman's Club, (hall & stairway)]
Photograph of the Beaumont Woman's Club in Beaumont, Texas.
Date:
February 1, 1994
Creator:
Texas Historical Commission
Object Type:
Photograph
System:
The Portal to Texas History
[Beaumont Woman's Club, (kitchen, facing south)]
Photograph of the Beaumont Woman's Club in Beaumont, Texas.
Date:
February 1, 1994
Creator:
Texas Historical Commission
Object Type:
Photograph
System:
The Portal to Texas History
[Beaumont Woman's Club, (northside, facing SW)]
Photograph of the Beaumont Woman's Club in Beaumont, Texas.
Date:
February 1, 1994
Creator:
Texas Historical Commission
Object Type:
Photograph
System:
The Portal to Texas History