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Fast Parallel Algorithms On A Class Of Graph Structures With Applications In Relational Databases And Computer Networks., Sridhar Radhakrishnan Jan 1990

Fast Parallel Algorithms On A Class Of Graph Structures With Applications In Relational Databases And Computer Networks., Sridhar Radhakrishnan

LSU Historical Dissertations and Theses

The quest for efficient parallel algorithms for graph related problems necessitates not only fast computational schemes but also requires insights into their inherent structures that lend themselves to elegant problem solving methods. Towards this objective efficient parallel algorithms on a class of hypergraphs called acyclic hypergraphs and directed hypergraphs are developed in this thesis. Acyclic hypergraphs are precisely chordal graphs and their subclasses, and they have applications in relational databases and computer networks. In this thesis, first, we present efficient parallel algorithms for the following problems on graphs. (1) determining whether a graph is strongly chordal, ptolemaic, or a block …

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Parametric Motion Transducer For Gravitational Wave Detectors., Odylio Denys De Aguiar Jan 1990

Parametric Motion Transducer For Gravitational Wave Detectors., Odylio Denys De Aguiar

LSU Historical Dissertations and Theses

We designed, constructed, and tested (using two different low phase noise electrical pump generators) a cryogenic double-resonant parabridge motion transducer made out of niobium, whose electrical output was amplified by a two stage MESFET cryogenic amplifier. Most of the experimental results agreed well with the theoretical models, and we successfully measured the mechanical Brownian motion of this transducer. We were able to adjust the two electrical bridge resonant frequencies on top of each other at the pump frequency, allowing us to obtain an electromechanical coupling as high as 0.054. This high coupling, corresponding to an rms electric field strength of …

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Studies In The Electrochemistry Of Insulators And Ion Transport: Anodization, Oscillometry, Electro-Osmosis, And Capillary Electrophoresis., Kiumars Ghowsi Jan 1990

Studies In The Electrochemistry Of Insulators And Ion Transport: Anodization, Oscillometry, Electro-Osmosis, And Capillary Electrophoresis., Kiumars Ghowsi

LSU Historical Dissertations and Theses

In part one, an analytical model for the growth kinetics of the anodic oxidation of Si at constant voltage is developed. The theoretical model derived for the film growth rate is consistent with the existing empirical relation reported earlier. Electronic current density, the major total current component, is shown to be nonohmic and space charge limited. Equations are derived, each as a function of time, for the total current density, the electronic current density, and the ionic efficiency during anodic oxidation. These theoretical predictions are in good agreement with the available experimental data. In part two, the high frequency conductances …

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Genetic Comparisons And Systematic Studies Of Termites (Isoptera)., Amy Kathryn Korman Jan 1990

Genetic Comparisons And Systematic Studies Of Termites (Isoptera)., Amy Kathryn Korman

LSU Historical Dissertations and Theses

Eusociality has evolved in only two insect orders: the Isoptera and Hymenoptera. While hymenopteran genetics has been the subject of intensive study, genetic information on termites is conspicuously lacking. The purpose of this dissertation was to utilize starch gel electrophoresis in genetic studies of termites. Chapter I consists of electrophoretic methods and a study of genetic variability among four families of termites. Although some representative species/colonies demonstrated low levels of variation, the ranges of polymorphic loci and gene diversity were within levels generally observed for the class Insecta. Levels of genetic variation exhibited by termites were higher than those values …

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Lévy Laplacian Of Generalized Functions On A Nuclear Space, Hui Hsiung Kuo, Nobuaki Obata, Kimiaki Saitô Jan 1990

Lévy Laplacian Of Generalized Functions On A Nuclear Space, Hui Hsiung Kuo, Nobuaki Obata, Kimiaki Saitô

Faculty Publications

The Lévy Laplacian ΔF(ξ) = limN→∞N-1∑n = 1N 〈F″(ξ),en⊗ en〉 is shown to be equal to (i) ∝TF″s″(ξ;t)dt, where Fs″ is the singular part of F″, and (ii) 2limρ{variant}→0ρ{variant}-2(MF(ξ,ρ{variant})-F(ξ)), where MF is the spherical mean of F. It is proved that regular polynomials are Δ-harmonic and possess the mean value property. A relation between the Lévy Laplacian Δ and the Gross Laplacian ΔGF(ξ) = ∑n = 1∞=〈F″(ξ),en⊗ en〉 is obtained. An application to white noise calculus is discussed. © 1990.

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Local Semigroups In Lie Groups And Locally Reachable Sets, Karl H. Hofmann, Jimmie D. Lawson Jan 1990

Local Semigroups In Lie Groups And Locally Reachable Sets, Karl H. Hofmann, Jimmie D. Lawson

Faculty Publications

In this paper the relationship between locally reachable sets for a fixed set of controls in the Lie algebra of a Lie group and the local semigroups generated by the corresponding one-parameter semigroup is considered. It is convenient to carry out the investigation in the Lie algebra itself, and the appropriate machinery for doing this is first developed. It is shown that local semigroups contain locally reachable sets. A general criterion (rerouting) is developed for the converse inclusion, and it is shown that if the set of controls is contained in a proper cone or is a Lie wedge (i.e., …

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A Characterization Of A Class Of Non-Binary Matroids, James G. Oxley Jan 1990

A Characterization Of A Class Of Non-Binary Matroids, James G. Oxley

Faculty Publications

A well-known result of Tutte is that U2,4, the 4-point line, is the only non-binary matroid M such that, for every element e, both Mβe and M e, the deletion and contraction of e from M, are binary. This paper characterizes those non-binary matroids M such that, for every element e, Mβe or M e is binary. © 1990.

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Lsu General Catalog 1990-1991, Louisiana State University And Agricultural And Mechanical College Jan 1990

Lsu General Catalog 1990-1991, Louisiana State University And Agricultural And Mechanical College

LSU General Catalog

The LSU General Catalog describes all undergraduate and graduate departments and programs with degree requirements and courses offered for each one. The General Catalog includes information on registration and financial aid as well as academic services offered to all students.

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Constructing Isospectral But Nonisometric Riemannian Manifolds., Sheng Chen Jan 1990

Constructing Isospectral But Nonisometric Riemannian Manifolds., Sheng Chen

LSU Historical Dissertations and Theses

In this paper, we examine the examples of isospectral but non-isometric Riemannian manifolds given by Milnor, Ikeda, and Vigneras. Of these, only Milnor's example is accounted for by Sunada's method of constructing isospectral manifolds, and even then only as an "unnatural" construction.

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Analysis For Creep, Shrinkage And Temperature Effects On Expansion Joint Movements In Composite Prestressed Concrete Bridges., Keith Joseph Rebello Jan 1990

Analysis For Creep, Shrinkage And Temperature Effects On Expansion Joint Movements In Composite Prestressed Concrete Bridges., Keith Joseph Rebello

LSU Historical Dissertations and Theses

A rigorous and efficient analytical model to predict the long-term deformation behavior of bridges with multiple, precast, pretensioned, prestressed concrete girders supporting cast-in-place-concrete deck slabs, was developed. The analytical procedure uses the finite element method with three-dimensional 20-node isoparametric elements to realistically model bridge geometry. Time dependent effects due to load and temperature history, creep, shrinkage and aging of concrete are included in the analysis. Creep and shrinkage strains are evaluated at different times using the more commonly used procedures, namely, the ACI-209, Bazant-Panula II and CEB-FIP procedures. Temperature strains are calculated from an assumed typical bridge temperature distribution based …

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An Adaptive Control System For Biological And Robotic Simulations., Sunggyu Kwon Jan 1990

An Adaptive Control System For Biological And Robotic Simulations., Sunggyu Kwon

LSU Historical Dissertations and Theses

An adaptive control algorithm based on Albus' CMAC (Cerebellar Model Articulation Controller) was studied with emphasis on how to build a Multilayered CMAC Control System. This concept has been devised to circumvent the excessive memory requirements of CMAC controllers for complex control systems with many inputs. The Neighborhood Sequential Training technique was devised as a general CMAC training technique. This training technique is straightforward to implement and well matched to CMAC's memory generalization. A two-layered CMAC control module was simulated for a six dimensional CMAC problem of trajectory control for a six degree of freedom manipulator. Layering was accomplished by …

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A Rock-Plant Filter Bench-Scale Study And Computer Model., Donna Gail Skipper Jan 1990

A Rock-Plant Filter Bench-Scale Study And Computer Model., Donna Gail Skipper

LSU Historical Dissertations and Theses

In Part One, three bench-scale rock filters containing 2 feet of gravel were investigated. Two of the filters were planted with Sagittaria lancifolia and Scirpus validus, while the third filter was an unvegetated control filter. During a preliminary portion of this study, the BOD$\sb5$ surface loading was held constant at 4.96 g/day/m$\sp2$. The BOD$\sb5$ mass removal percentages at this time averaged 75%, 60%, and 44% for the Scirpus, Sagittaria, and control systems, respectively. Following this constant loading rate, an 80-day experiment was run on the filters using eight combinations of two flow rates and four influent BOD$\sb5$ concentrations, each combination …

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The Combustion Of Linear Droplet Arrays In A Coaxial Convective Flow., Jeng-Syan Tsai Jan 1990

The Combustion Of Linear Droplet Arrays In A Coaxial Convective Flow., Jeng-Syan Tsai

LSU Historical Dissertations and Theses

As approximations for spray-combustion processes, a series of increasingly sophisticated numerical models has been developed to simulate the combustion of linear droplet arrays in a co-axial, convective flow. Common to all of the models is an embedded grid, developed to increase computational accuracy. The first and simplest model is potential flow model (for Re $\to$ $\infty$). The flow is assumed to be ideal and infinitely-fast kinetics (flame sheet assumption) represent the combustion. The results show that the instantaneous droplet burning rates are increased as the droplet spacing is increased, and the burning rates of droplets tend asymptotically to smaller values …

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Probabilistic Analysis Of Bridge Scour Using The Principle Of Maximum Entropy., Donald Edward Barbe' Jan 1990

Probabilistic Analysis Of Bridge Scour Using The Principle Of Maximum Entropy., Donald Edward Barbe'

LSU Historical Dissertations and Theses

The probability distribution function for floods and velocity profile in open channel flow are combined with scour theory to present a procedure for determining the risk of bridge failure due to scour. This is accomplished by deriving a probability distribution function for scour at a bridge pier. The theory of entropy and the principle of maximum entropy are used to determine the velocity profile. The constraints used in the entropy maximization are derived from the physical laws of conservation of mass, momentum, and energy. A procedure to approximate the solution to the resulting equations is shown. The vertical velocity is …

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An Environmental Challenge Of Body Image Disturbance In Bulimia Nervosa., Sandra Jean Mckenzie Jan 1990

An Environmental Challenge Of Body Image Disturbance In Bulimia Nervosa., Sandra Jean Mckenzie

LSU Historical Dissertations and Theses

An environmental challenge of body image disturbance in bulimia nervosa was investigated. A new theoretical model was proposed to define the construct of body image disturbance in terms of body image distortion, drive for thinness, and body size dissatisfaction. The purpose of this study was to investigate the reactivity effects of an environmental challenge on body image disturbance in a 2 x 2 factorial design. Thirty-six females participated. Eighteen subjects had been diagnosed with bulimia nervosa and 18 subjects were selected as controls. Subjects were matched on height and weight and compared on a variety of measures related to body …

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The Development Of A Prototype Knowledge-Based Expert System To Assist Vocational Educators In The Development Of The Local Plan Application For Vocational Education Funds., Brady Keith Levrier Jan 1990

The Development Of A Prototype Knowledge-Based Expert System To Assist Vocational Educators In The Development Of The Local Plan Application For Vocational Education Funds., Brady Keith Levrier

LSU Historical Dissertations and Theses

The Carl D. Perkins Act of 1984 provides significant financial support for the enhancement and expansion of secondary and post-secondary vocational education programs in the United States. Individual states are required to develop a State Plan for the use of Carl D. Perkins vocational funds. The formulation of this State Plan requires the development of Local Plans on the part of local education agencies who wish to participate in this program. These Local Plans are then compiled to form the State Plan which then is presented to the Department of Education for review. The annual Local Plan development process is …

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Role Duality As Represented In The Antiabolitionist Speeches Of James Shannon., Barry Cole Poyner Jan 1990

Role Duality As Represented In The Antiabolitionist Speeches Of James Shannon., Barry Cole Poyner

LSU Historical Dissertations and Theses

The dissertation alleges that a speaker may juggle roles in a given rhetorical situation, what may be termed role duality. Role duality refers to a speaker's attempt to effect multiple intentions while fulfilling or partially fulfilling multiple role expectations. A purpose of this dissertation was to speculate further on the nature and function of role duality by analyzing the speeches of James Shannon. Correspondingly, another purpose was to evaluate through rhetorical criticism the pro-slavery, anti-abolitionist speeches of Shannon. Shannon (1799-1859), an evangelist in the Churches of Christ and an influential educator, delivered two principal speeches in defense of slavery: (1) …

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A New Approach To Analyzing High-Resolution Aerial Photographs Of Urban Areas., Timothy Dwayne Phillips Jan 1990

A New Approach To Analyzing High-Resolution Aerial Photographs Of Urban Areas., Timothy Dwayne Phillips

LSU Historical Dissertations and Theses

This dissertation proposes a new approach for analyzing high resolution aerial photographs of urban areas. Analyzing aerial photographs is the process of constructing an overall description of a scene. It involves knowledge of visual sensors, computing systems, artificial intelligence, software engineering, and perceptual psychology. Researchers have had only limited success in this area. This dissertation considers a high level analysis approach. Most aerial photograph interpretation systems concentrate on analyzing an airport, roadway, or urban scene. Those systems, however, do not explain how they know they were examining such a scene. This dissertation concentrates on how to reach that point. It …

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Exterior Vertices In Graphs And Realization Of Plurality Preference Digraphs., Weizhen Gu Jan 1990

Exterior Vertices In Graphs And Realization Of Plurality Preference Digraphs., Weizhen Gu

LSU Historical Dissertations and Theses

Part I: Peripheral and eccentric vertices of graphs. For a connected graph G, let P(G) and EC(G) denote the sets of peripheral vertices and eccentric vertices of G, respectively. In 1988 F. Buckley initiated the study of the class S of graphs G for which P(G) = EC(G). We provide several families of graphs which are in S. For certain graphs G with diameter equal to 2r(G) or 2r(G) or 2r(G) $-$ 1, we give criteria for P(G) and EC(G) to be equal. Also, for certain products, we characterize those pairs of graphs so that their product is in S. …

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Some Problems For Graph Minors., Bradley Scott Gubser Jan 1990

Some Problems For Graph Minors., Bradley Scott Gubser

LSU Historical Dissertations and Theses

This dissertation solves two problems relating to the structure of graphs. The first of these is motivated by Kuratowski's Theorem, perhaps the most famous result in graph theory. This theorem states the $K\sb5$ and K$\sb{3,3}$ are the only non-planar graphs for which both $G\\ e$, the deletion of the edge e, and G/e, the contraction of the edge e, are planar for all edges e of G. We characterize the non-planar graphs for which $G\\ e$ or G/e is planar for all edges e of G. The second problem we solve is motivated by Tutte's wheels theorem. An immediate consequence …

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An Exploratory Study Of Self-Efficacy's Network Of Relationships., Ginger Kay Kendell-Brainard Jan 1990

An Exploratory Study Of Self-Efficacy's Network Of Relationships., Ginger Kay Kendell-Brainard

LSU Historical Dissertations and Theses

This study explored the construct of self-efficacy and provided information about its relationships with intelligence, academic achievement, social skills, and family variables. Specifically, a correlational analysis examined the associations with academic and social self-efficacy, intelligence, academic achievement, and social skills. Exploratory univariate analyses investigated whether self-efficacy beliefs differed for students with varying family structures. Multiple regression analyses were utilized to determine significant predictors of self-efficacy. The results of the analyses indicated that academic self-efficacy was significantly correlated with intelligence, three areas of academic achievement, and social skills. Social self-efficacy was significantly correlated with social skills and two areas of academic …

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Decontamination Of Soil Using Electro-Osmosis., Jihad Tawfiq Hamed Jan 1990

Decontamination Of Soil Using Electro-Osmosis., Jihad Tawfiq Hamed

LSU Historical Dissertations and Theses

Electrokinetic soil processing is an innovative insitu technique to remove contaminants from soils and groundwater. The process is an alternative to conventional processes, with significant economic and technical advantages. A theory is presented for pH gradient development by diffusion and convection in electrokinetic processing of soils. The premises and consequences of the theory are discussed. Based upon this theory, a mathematical model is developed to predict the pH gradient development in electro-osmosis. Electro-osmosis tests are conducted on saturated kaolinite specimens loaded with Pb(II), Cd(II), and Cr(III) to investigate the feasibility, efficiency, and energy requirements of the process in removal of …

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Keeping The Faith: Douglas Southall Freeman, 1886-1953. (Volumes I And Ii)., John R. Peacock Iii Jan 1990

Keeping The Faith: Douglas Southall Freeman, 1886-1953. (Volumes I And Ii)., John R. Peacock Iii

LSU Historical Dissertations and Theses

This is a study of the life and career of Douglas Southall Freeman (1886-1953), whose careful scheduling of every minute of every day allowed him to pursue two full-time careers--one as a historian and one as editor of a major daily newspaper. In both occupations his views were shaped by the traditional values he acquired in this youth--religious conviction, reverence for heroes, devotion to duty, self-control, fortitude, industry, thrift. Growing up in Virginia during the era of the Confederate celebration, Freeman came to admire one hero above all others--Robert E. Lee, a man whose character best exemplified his own moral …

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Parallelization Of Goal-Driven, Production Systems On Hypercube Machines In A C Environment., Rajendra Kumar Shrivastava Jan 1990

Parallelization Of Goal-Driven, Production Systems On Hypercube Machines In A C Environment., Rajendra Kumar Shrivastava

LSU Historical Dissertations and Theses

Production systems are widely used in artificial intelligence to capture the notion of expertise in modeling expert systems. Production systems are computationally intensive programs spending most of the execution time in their MATCH or recognise phase. Efforts have been made by the research in this dissertation to minimize the production system's execution time by optimizing the MATCH phase. Goal oriented deterministic production systems are commonly used for robotics applications and formed the main class of production systems that were studied in this dissertation. The main motivation for the research was to provide a better MATCH algorithm and use the multiprocessing …

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Factors Influencing The Selection Of Business Majors As Perceived By University Business Students., E. Evaline Echols Jan 1990

Factors Influencing The Selection Of Business Majors As Perceived By University Business Students., E. Evaline Echols

LSU Historical Dissertations and Theses

The objectives of this study were to: describe business majors in Tennessee universities affiliated with the National Association of Business Teacher Education (NABTE), compare the demographic characteristics of business students among groups of majors, determine the perceived degree of desirability of various business majors, determine the perceived influence of various factors on the selection of a college major by business students and groups of business majors, determine why business students did not choose business teacher education as a major, determine student perceptions toward careers and majors, and compare student perceptions toward careers and majors among different groups of business majors. …

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Designing Efficient Algorithms For Distributed Systems., Mohan B. Sharma Jan 1990

Designing Efficient Algorithms For Distributed Systems., Mohan B. Sharma

LSU Historical Dissertations and Theses

Search for efficient algorithms for distributed systems has become an important area of computer science. This research is driven by the need to efficiently process and communicate information generated by the system. In distributed systems, topological information plays an important role in the design of fast algorithms for problems such as routing, broadcasting, and sorting. The central focus of this dissertation is the design and analysis of distributed algorithms for determining topological information in asynchronous communication networks. Specifically, we present distributed algorithms for two generic problems: distributed graph problems and network traversal problems. Network location and network recognition are two …

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Quantitative Ftir Analysis Of Gas Phase Cigarette Smoke., Rafael Cueto Jan 1990

Quantitative Ftir Analysis Of Gas Phase Cigarette Smoke., Rafael Cueto

LSU Historical Dissertations and Theses

A new method, using Fourier transform infrared spectroscopy (FTIR), was developed for the simultaneous determination of nitrogen dioxide and nitric oxide in gas phase cigarette smoke and in model systems. The FTIR method also allows the simultaneous determination of other components. The method uses multivariate least-squares regression analysis, that allows simultaneous quantitation of several components even in the presence of overlapping peaks, and fast data acquisition for kinetic analysis. For the preparation of the gas mixtures an apparatus that uses mass flow controllers, check-valves, and ground glass joints was constructed. This apparatus gives very exact metering, allowing the preparation of …

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Computational Neural Learning Formalisms For Perceptual Manipulation: Singularity Interaction Dynamics Model., Sandeep Gulati Jan 1990

Computational Neural Learning Formalisms For Perceptual Manipulation: Singularity Interaction Dynamics Model., Sandeep Gulati

LSU Historical Dissertations and Theses

This dissertation addresses a fundamental problem in computational AI--developing a class of massively parallel, neural algorithms for learning robustly, and in real-time, complex nonlinear transformations from representative exemplars. Provision of such a capability is at the core of many real-life problems in robotics, signal processing and control. The concepts of terminal attractors in dynamical systems theory and adjoint operators in nonlinear sensitivity theory are exploited to provide a firm mathematical foundation for learning such mappings with dynamical neural networks, while achieving a dramatic reduction in the overall computational costs. Further, we derive an efficient methodology for handling a multiplicity of …

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Transition-Structure Recognition In Polyether-Catalyzed Ester Aminolysis Carried Out In Nonpolar Media., John Charles Hogan Jan 1990

Transition-Structure Recognition In Polyether-Catalyzed Ester Aminolysis Carried Out In Nonpolar Media., John Charles Hogan

LSU Historical Dissertations and Theses

The mechanism of aminolysis of aryl acetates carried out in chlorobenzene involves rate-determining breakdown of the tetrahedral adduct formed by the nucleophilic attack of an amine on the carbonyl carbon of an aryl acetate ester. The breakdown of this tetrahedral adduct is assisted by the intervention of either a second amine moiety or a weakly basic catalyst moiety. The second amine or catalyst hydrogen bonds to an ammonium hydrogen of the zwitterionic tetrahedral adduct, which stabilizes this adduct by dispersing the positive charge on its cationic (ammonium) portion. Stabilization of the adduct occurs at the expense of a weaker 1,3-dipolar-stabilizing …

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Small Sample Properties Of Estimators And Test Statistics In Nonlinear Regression: The Box-Cox Transformation., Minbo Kim Jan 1990

Small Sample Properties Of Estimators And Test Statistics In Nonlinear Regression: The Box-Cox Transformation., Minbo Kim

LSU Historical Dissertations and Theses

The dissertation will address small sample properties of estimators and test statistics in a nonlinear regression model. The Box-Cox transformation is attractive to economists because a family of functional forms can be compared simultaneously within the framework of classical statistical inference. Usually, maximum likelihood (ML) methods are used to estimate the Box-Cox model. In the present study, nonlinear two stage and iterative generalized least squares (IGLS) method are considered. The accuracy of probability statements concerning nonlinear models is often questionable in small samples. Therefore, the finite sample distribution of the asymptotic t-statistic in the Box-Cox model is derived using an …

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