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 Algorithms (3)
 Dye lasers (2)
 Image processing  Digital techniques (2)
 Pattern recognition systems (2)
 Sequential machine theory (2)

 Hydrothermal electric power systems (1)
 Electric power production  Mathematical models (1)
 Ovulation  Detection  Data processing (1)
 Optical pattern recognition (1)
 Polarization (Light) (1)
 Laser communication systems (1)
 Cervix mucus (1)
 Light filters (1)
 Liquid crystals  Optical properties (1)
 Fiber optics (1)
 Carbon dioxide lasers (1)
 Modelocked lasers (1)
 Electric powerplants  Efficiency  Mathematical models (1)
 Computer architecture (1)
 Parallel processing (Electronic computers) (1)
 Ultrashort Laser pulses (1)
 Neural computers (1)
Articles 1  12 of 12
FullText Articles in Engineering
A New Approach To State Minimization Of Finite State Machines, William Yue Zhao
A New Approach To State Minimization Of Finite State Machines, William Yue Zhao
Dissertations and Theses
A complete program to ease the task of large scale Finite State Machine (FSM) minimization presented in this thesis: TDFM (Two Dimensional FSM Minimizer), is a part of the DIADES system. DIADES is an Automatic Design Synthesis System whose development in the Department of Electrical Engineering at Portland State University is supported in part by a research grant from SHARP Microelectronics Technology.
The Effects Of Bandwidth Limiting Tuning Elements On A Synchronously Pumped ModeLocked Dye Laser, Bahram Zandi
The Effects Of Bandwidth Limiting Tuning Elements On A Synchronously Pumped ModeLocked Dye Laser, Bahram Zandi
Dissertations and Theses
In this study an improved description of the bandwidth limiting tuning filters has been introduced into a semiclassical model for a synchronously pumped modelocked dye laser system. This model is an improvement over the traditional rate equation approach since it has detailed representations of the energy levels, rotational distribution, and coherence effects. The new set of equations has been solved numerically using the best available values for the various parameters, and autocorrelations have been computed for a range of different length detuning and bandwidth limiting elements. In the experiments, an acoustooptically modelocked argon ion laser is used to synchronously pump ...
Invariant Pattern Recognition Algorithm Using The Hough Transform, Duwang Li
Invariant Pattern Recognition Algorithm Using The Hough Transform, Duwang Li
Dissertations and Theses
A new algorithm is proposed which uses the Hough Transform to recognize two dimensional objects independent of their orientations, sizes and locations. The binary image of an object is represented by a set of straight lines. Features of the straight lines, namely the lengths and the angles of their normals, their lengths and the end point positions are extracted using the Hough Transform. A data structure for the extracted lines is constructed so that it is efficient to match the features of the lines of one object to those of another object, and determine if one object is a rotated ...
A Finite State Machine Synthesizer, Jiuling Liu
A Finite State Machine Synthesizer, Jiuling Liu
Dissertations and Theses
This thesis presents a Finite State Machine (FSM) Synthesizer developed at Portland State University. The synthesizer starts from a high level behavioral description, in which no states are specified, and generates the lower level FSM descriptions for simulation and physical layout generation.
Ultrashort Pulse Production In Synchronously Pumped ModeLocked Dye Laser Systems, Duncan Leo Macfarlane
Ultrashort Pulse Production In Synchronously Pumped ModeLocked Dye Laser Systems, Duncan Leo Macfarlane
Dissertations and Theses
The concern of this dissertation is the understanding and improvement of a class of lasers that is responsible for some of the shortest optical pulses available today. In particular, we seek ways to produce from synchronously pumped modelocked dye laser systems, shorter pulses of higher intensity with improved pulsetopulse consistency. Specific topics.that are discussed herein include the study of the role of the pump pulse in synchronously pumped modelocked lasers, the study of the pulse shaping and shortening due to an intracavity saturable absorber, and the study of a fundamental pulse train instability associated with these lasers.
Application Of Hough Transformation To Detect Ovulatory Patterns In Cervical Mucus Images, Shiliang Wang
Application Of Hough Transformation To Detect Ovulatory Patterns In Cervical Mucus Images, Shiliang Wang
Dissertations and Theses
A microcomputer system called ovulocomputer is proposed. The system is used to predict and detect ovulation of women. It will use image processing and analysis, pattern recognition theory, spectrophotometry, ionometry and conductometry to measure various physical and chemical properties of cervical mucus that are related to blood hormone levels.
The functions and characteristics of cervical mucus are introduced in this thesis. Among them, the identification of cervical mucus images, named the ferning test, and related features, are well described.
A new idea, called ferning test automation, which has been neither proposed nor developed before, is presented and explained in detail ...
Dynamic Behavior Of Co₂ Lasers, Li Zhang
Dynamic Behavior Of Co₂ Lasers, Li Zhang
Dissertations and Theses
Spontaneous pulsations have been observed in the output of a CO_{2} laser. The temporal waveforms, transverse mode patterns, and laser lines are simultaneously measured under various operation conditions. The experimental data show that these pulsations have a direct connection with the transverse modes. We interpret the oscillations as being caused by mode beating, and the frequency shift of the oscillation as resulting from mode pulling. The theoretical explanations for these effects are in good agreement with the experimental results.
Endless StateOfPolarization Control For Coherent Optical Communication Systems Using Nematic Liquid Crystals, Scott Hamilton Rumbaugh
Endless StateOfPolarization Control For Coherent Optical Communication Systems Using Nematic Liquid Crystals, Scott Hamilton Rumbaugh
Dissertations and Theses
One of the obstacles to coherent fiberoptic communications is the unpredictable polarization drift which necessitates the use of an active polarization controlling system to match the polarizations of the signal and local oscillator. The polarization match must be maintained during the reset of any of the finite range components to prevent loss of data. We present a novel and practical system which uses three liquid crystal devices for the polarization matching process. Also, the required reset control algorithm and its derivation are described in detail.
Parallel Architectures For Solving Combinatorial Problems Of Logic Design, Phuong Minh Ho
Parallel Architectures For Solving Combinatorial Problems Of Logic Design, Phuong Minh Ho
Dissertations and Theses
This thesis presents a new, practical approach to solve various NPhard combinatorial problems of logic synthesis, logic programming, graph theory and related areas. A problem to be solved is polynomially time reduced to one of several generic combinatorial problems which can be expressed in the form of the Generalized Propositional Formula (GPF) : a Boolean product of clauses, where each clause is a sum of products of negated or nonnegated literals.
The Application Of The Ordered List Method And The Dynamic Programming To The Unit Commitment, Hoang Uong
The Application Of The Ordered List Method And The Dynamic Programming To The Unit Commitment, Hoang Uong
Dissertations and Theses
The thesis presents a method of committing generating units in a hydrothermal power system within practical computer resources such as computer time and data storage.
An Approach To Pattern Recognition Of Multifont Printed Alphabet Using Conceptual Graph Theory And Neural Networks, Ihab A. Harb
An Approach To Pattern Recognition Of Multifont Printed Alphabet Using Conceptual Graph Theory And Neural Networks, Ihab A. Harb
Dissertations and Theses
This thesis describes an approach for accomplishing a pattern recognition task using conceptual graph theory and neural networks (NNs). The set of patterns to be recognized are the capital letters of six different fonts of the English alphabet, plus two shifted and six rotated versions of each. The letters are represented to the neural network on a 16x16 input grid (256 "sensor lines"). A standard classification encoding for such patterns is to use a 26bit vector (26 lines at the NN's output), one bit corresponding to each letter. Experiments with such an encoding yielded results with poor generalization capability ...
A Comparative Study Of The Performance Of Various Image Analysis Methods For Dimensional Inspection With Vision Systems, Ralf Koeppe
Dissertations and Theses
Dimensional inspection with Vision Systems requires a careful selection of image analysis methods in order to obtain accurate information about the geometry of the parts to be measured.
The purpose of this project is to study, implement and compare different image evaluation methods and to show their strengths and weaknesses with respect to dimensional inspection. Emphasis is made on the inspection of circular features. The criteria of comparison for these methods are discussed. Using synthetically generated images, various analysis methods are compared and conclusions for their use are drawn. Results of the comparison show that the selection of a method ...