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Projects in 1985–1986

Garrett Automotive Products Co.: Mathematical Modeling of Floating Ring Bearings in High Speed Rotating Machinery

Robert Borrelli

GAPCO needed better analytical capabilities for further bearing designs. The task of the project was to construct mathematical model(s) for floating ring bearings for high-speed turbo machinery applications. The model(s) were to be used to calculate bearing stiffness, damping characteristic, bearing stability, limit cycle and power loss. Testing and empirical verification was performed by GAPCO.

Honeywell, Inc.: Generating Realistic Video Displays by Manipulating Photographic Images

David Fisher

During the past several years, major technology advancements have made feasible (affordable) the processing of photographic images into realistic video scenes at 30 frames per second TV rates. The Honeywell system of Computer Generated Synthesized Imagery (CGSI), based on a linear warp algorithm, was analyzed by one of last year's clinics. The goal of this year's clinic was to extend the analysis into other areas of the problem including true warp algorithms and minimization of disturbing artifacts such as aliasing, scintillation, and Moire effects. Other problem areas were also identified and examined during the course of the clinic. The project developed algorithms, definition of performance characteristics for such algorithms, and a mathematical theory for measuring the performance and comparing algorithms.

Jet Propulsion Laboratory: Modeling Short Channel MOSFET's for use in VSLI

Mario Martelli

Field effect transistors are semi-conductors used in electronic devices. Their properties had been modeled previously by one-dimensional approximations. Now that their dimensions were being systematically reduced, more sophisticated modeling was required. The application of differential equations and computer programming were the prime tools.

Jet Propulsion Laboratory: A Probabilistic Position-Fixing Model

John Ferling

The problem concerned the effect that various sensor errors (random and systematic) have in determining the location of an object. Statistical analysis was used to determine best estimates of locations in two and three dimensions.

Perkin--Elmer Corporation: Computational Methods for the Mass Spectrometer

Hans Heijmans

Perkin-Elmer's mass spectrometer is used in monitoring environmental spills, breath of patients, etc. Last year's team applied statistical analysis to determine the dwell time (the time spent at each location of mass/charge). Additional factors were considered with the view to optimize the use of the machine. The project was not heavily statistical. Because implementation was limited by PC capabilities algorithmic inventiveness was a priority.

System Development Corporation: Multispectral Classifier

Henry Krieger

"Remote sensing systems routinely provide multi-spectral information and digital image processing provides qualitative tools for visual interpretation as well as quantitative tools for categorizing this information. Multispectral classification, a common approach to computer-aided mapping, was used to reduce the large, apparently unrelated, amounts of information to a set of features with similar reflective or emissive properties. A classifier algorithm must first compute the statistics which describe these features and then attempt to isolate unknown spectral signatures into the appropriate class using the predetermined statistics to define the decision boundary between each category.

The clinic project was to design, implement and test an unsupervised classifier on a VAX under VMS. Imagery, processed or unprocessed, would be provided by SDC. The design included (1) investigation of known algorithms with implementation and test of the most promising; (2) any other algorithms proposed by the Clinic team; (3) suggested preprocessing options; (4) design of a user interface; and (5) validation of an imagery set that was separate, but similar to that used for development. SDC provided the necessary components of their SDCIPS software package to HMC so that HMC could accomplish this task and have a product compatible with IPS."