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Articles 8371 - 8400 of 10020
Full-Text Articles in Entire DC Network
Adaptive Pattern Recognition Of Hand-Written Chinese Characters Using Fourier Transforms Of Projection Profiles, Der-Tsyi Chuang
Adaptive Pattern Recognition Of Hand-Written Chinese Characters Using Fourier Transforms Of Projection Profiles, Der-Tsyi Chuang
Theses
None provided.
Image Reconstruction Using Wiener Filtering And Unsharp Masking: A Computer Model, Jay Berman
Image Reconstruction Using Wiener Filtering And Unsharp Masking: A Computer Model, Jay Berman
Theses
Research was conducted to computer model and compare the image reconstruction obtainable using Wiener filtering and unsharp masking. Wiener filtering and unsharp masking are techniques used to improve image quality and interpretation. It was demonstrated that far greater image restoration is obtained by Wiener filter than by unsharp masking because unsharp masking, unlike Wiener filtering, enhanced image noise along with the edges. A user friendly computer model, that may be used as a tutorial aid for Image Science students, incorporating Fast Fourier Transform (FFT) techniques was designed. Graphics allow the user to follow each stage of the image processing.
R.I.T. News & Events - June 13, 1985, University News Services, Rochester Institute Of Technology
R.I.T. News & Events - June 13, 1985, University News Services, Rochester Institute Of Technology
University Publications
No abstract provided.
Displaced Vignettes/Memory Trace, Elizabeth Gafarian
An Examination Of Modulation In Shipley S1400 Positive Photoresist As Resist Thickness Varies, Mary Kay Swan
An Examination Of Modulation In Shipley S1400 Positive Photoresist As Resist Thickness Varies, Mary Kay Swan
Theses
A method of determining photoresist image modulation was investigated and utilized, in determining the effect of varied resist thicknesses on modulation for both a high and low contrast system. Modulation is defined in terms of maximum and minimum energy required to clear a line/space pattern in the resist image. In This study, useing the resist as the threshold detector, chemical contrast is compared to physical contrast in terms of modulation. Shipley's MF314 and MF312 are the two different contrast development systems used. This study has shown that beyond 11700 Å of resist thickness, physical modulation is reduced to a measure …
R.I.T. News & Events - May 16, 1985, University News Services, Rochester Institute Of Technology
R.I.T. News & Events - May 16, 1985, University News Services, Rochester Institute Of Technology
University Publications
No abstract provided.
Color: A Semiotic Approach (A Video Tape Presentation), Michele Italiano
Color: A Semiotic Approach (A Video Tape Presentation), Michele Italiano
Theses
None provided.
An Automated Tungsten Source Sensitometer, Michael L. Rudolph
An Automated Tungsten Source Sensitometer, Michael L. Rudolph
Theses
The design and evaluation of an automated tungsten source sensitometer are described. Design considerations are outlined. Equipment performance is evaluated and found to exceed the specifications developed. The unit is currently being used to support production testing.
Reporter - May 10th 1985, Rit Reporter Staff
Reporter - May 10th 1985, Rit Reporter Staff
University Publications
No abstract provided.
Reporter - May 3rd 1985, Rit Reporter Staff
Reporter - May 3rd 1985, Rit Reporter Staff
University Publications
No abstract provided.
R.I.T. News & Events - May 2, 1985, University News Services, Rochester Institute Of Technology
R.I.T. News & Events - May 2, 1985, University News Services, Rochester Institute Of Technology
University Publications
No abstract provided.
The Effects Of Common Solvents On Different Types Of Flexographic Printing Plates, Jack Jenkins
The Effects Of Common Solvents On Different Types Of Flexographic Printing Plates, Jack Jenkins
Theses
A dynamic development which has sparked flexography is the introduction and use of photopolymer plates. These plates have simplified flexographic printing by reducing the amount of time and effort needed to prepare plates for press and makeready. An experiment was conducted to determine the effect of commonly used solvent mixtures on flexographic plates. The plates tested include those using natural rubber, Buna N, and various photopolymers. The experiment specifically studied change in hardness of these plate materials due to immersion in different solvent mixtures over time. Noticeable differances in the degree of softening of plates was observed after 24 hours …
An Analysis Of Stroke Fluid Flow In A Converging Channel Using A Penalty Function Finite Element Formulation, Keith A. Honkala
An Analysis Of Stroke Fluid Flow In A Converging Channel Using A Penalty Function Finite Element Formulation, Keith A. Honkala
Theses
A penalty function finite element program is developed to study two dimensional creeping flow in a converging channel. The finite element solution is compared to the analytical solution of purely radial flow. The analysis reveals that the assumption of purely radial flow is valid for small apex angles, but is inappropriate for larger angles .
Determining Process Latitude With Electrically Measurable Test Structures, Jonathan Littlehale
Determining Process Latitude With Electrically Measurable Test Structures, Jonathan Littlehale
Theses
Collection of linewidth data is an important part of photoresist characterization. Linewidth data are usually collected by optical measurements or scanning electron microscopy. Both of these techniques are tedious and time-consuming. In this work, electrically measurable test structures are used to collect linewidth data. These structures use a measured sheet resistance, a known length of conducting material, and the measured resistance of the structure to determine the linewidth. The benefits of using these structures include completely automated data collection and the ability to collect statistically significant amounts of data. This allows the use of existing statistical analysis software to analyze …
Simulation Of An Open-Loop Stepping Motor System, Gregory Bell
Simulation Of An Open-Loop Stepping Motor System, Gregory Bell
Theses
This report presents a description and functional model of a hybrid stepping motor drive system. The motor drive methods of fullstepping and backstepping are presented as examples. Test methods for system characterization are described, and response characteristics for the simulated and experimental results are compared to verify the model. This paper shows that an open-loop stepping motor drive system can be accurately simulated to predict real hardware performance.
Optimization Of An Elastic Drive Belt System Using An Algorithm Of Automated Optimal Design, Gerald T. Lioy
Optimization Of An Elastic Drive Belt System Using An Algorithm Of Automated Optimal Design, Gerald T. Lioy
Theses
In this design project an elastic drive belt system is optimized using an algorithm of automated optional design, AOD. First, some basic background information on AOD and elastic drive belt systems is reviewed. An elastic drive belt system configuration is defined, mathematically formulated, and optimized. The mathematical formulation, including a set of constraints, is completely derived. It is set up to be as general as possible so that it may be applied to a wide variety of different problems. In several places the formulation uses the recommendations of an elastic drive belt manufacturer for a good design. A sample design …
Model Automatic Focusing System For Linewidth Measuring Instruments, John Ingraham
Model Automatic Focusing System For Linewidth Measuring Instruments, John Ingraham
Theses
This paper discusses research on an automatic focusing system for IC-linewidth measuring instruments. The instrument incorporates a collimated light source, a device to move a sample in small, precise increments, and a charge-coupled device. The autofocusing model would measure the step-height of a dielectric sample and correlate the height to a focus position. Thickness of samples on an enlarged scale were measured to verify the feasibility of this device.
Reporter - April 26th 1985, Rit Reporter Staff
Reporter - April 26th 1985, Rit Reporter Staff
University Publications
No abstract provided.
Reporter - April 19th 1985, Rit Reporter Staff
Reporter - April 19th 1985, Rit Reporter Staff
University Publications
No abstract provided.
The Use Of Edge Gradient Analysis On Chrome And Emulsion Photomasks To Determine Modulation Transfer Functions, Marcy E. Levin
The Use Of Edge Gradient Analysis On Chrome And Emulsion Photomasks To Determine Modulation Transfer Functions, Marcy E. Levin
Theses
Using edge gradient analysis on chrome and emulsion photomasks to determine the modulation transfer function of a mask making system proved to be limited by the method in which the edge gradients were observed. Scanning electron micrographs were taken of the chrome and emulsion edges on various masks, and results showed that chrome photosmasks exhibit steeper gradients and better edge acuity than emulsion images. However, due to the ratio of line size to gradient size on each of the types of masks, it was decided that the gradient would not make a significant contribution to modulation loss in the image.
R.I.T. News & Events - April 18, 1985, University News Services, Rochester Institute Of Technology
R.I.T. News & Events - April 18, 1985, University News Services, Rochester Institute Of Technology
University Publications
No abstract provided.
The Effects Of Partial Coherence On The Imaging Of Lines On Photoresist, Robert Douglas Watso
The Effects Of Partial Coherence On The Imaging Of Lines On Photoresist, Robert Douglas Watso
Theses
A series of images of a AMI/RIT resolution mask was imaged at the following partial coherence values: 0.7, 0.65, 0.6, 0.55, 0.5, 0.45, 0.4, and 0.35. The line-width and slope of the 10 micron lines imaged at each particular partial coherence value was analyzed and evaluated. The slope of the developed photoresist sidewall improved significantly with a decrease in partial coherent illumination, except for the 0.7 to 0.65, range while the line-width decreased.
The Effect Of Cross-Coupling On The Temporal Response Of Ultrasonic Transducer Arrays, David Hadley
The Effect Of Cross-Coupling On The Temporal Response Of Ultrasonic Transducer Arrays, David Hadley
Theses
An investigation was performed examining a possible cause of acoustic cross-coupling in ultrasonic transducer arrays. It was postulated that pulse velocity was decreased due to the physical presence of other ultrasonic pulses in the medium. It was demonstrated that average pulse velocity is independent of the number of opposing waves traveling through an acoustic medium. A description of variable pulse velocity is discussed.
Reporter - April 12th 1985, Rit Reporter Staff
Reporter - April 12th 1985, Rit Reporter Staff
University Publications
No abstract provided.
Spectrophotometric Color Formulation Based On Two-Constant Kubelka-Munk Theory, Eric Walowit
Spectrophotometric Color Formulation Based On Two-Constant Kubelka-Munk Theory, Eric Walowit
Theses
A new approach to computer color formulation based on non-linear least-squares techniques has been developed to characterize colorants and predict their behavior in mixtures. This approach allows the optimization of absorption and scattering calculations to characterize these colorants. This same method has been used to directly match the spectral reflectance of a standard with a mixture of colorants that yields nearly the same spectral reflectance as the standard being matched. Several advantages have been gained over more traditional methods: Kubelka-Munk K and S has been determined without primary binary blends, the spectral reflectance of the standard and proposed formulation exhibit …
A Method For Comparison Of Anti-Reflection Coatings For Photoresist Via A Simple Computer Algorithm, Neil Levine
A Method For Comparison Of Anti-Reflection Coatings For Photoresist Via A Simple Computer Algorithm, Neil Levine
Theses
A method was achieved to allow a quantitative and rapid comparison of different anti-reflection coatings (ARC) used under the photoresist layer in semiconductor-device fabrication. The computer algorithm utilizes the spectral irradiance of the source, reflectance of the substrate, absorption of the photoresist and ARC, and the spectral sensitivity of the photoresist to provide a quantitative value of the total system response to reflectance. The algorithm was tested by correlating the resultant value with photoresist resolution on aluminum, polysilicon, and 2nd-oxide process layers, and found to be linear with an R-squared value of 0.99S5 within the region investigated. Subsequent statistical analysis …
Reporter - March 29th 1985, Rit Reporter Staff
Reporter - March 29th 1985, Rit Reporter Staff
University Publications
No abstract provided.
Reporter - March 22nd 1985, Rit Reporter Staff
Reporter - March 22nd 1985, Rit Reporter Staff
University Publications
No abstract provided.
R.I.T. News & Events - March 21, 1985, University News Services, Rochester Institute Of Technology
R.I.T. News & Events - March 21, 1985, University News Services, Rochester Institute Of Technology
University Publications
No abstract provided.
R.I.T. News & Events - March 7, 1985, University News Services, Rochester Institute Of Technology
R.I.T. News & Events - March 7, 1985, University News Services, Rochester Institute Of Technology
University Publications
No abstract provided.