Digital Commons Network^™

The Role Of T Cells In The Pathogenesis Of Periapical Lesions, John B. Wallstrom

Loma Linda University Electronic Theses, Dissertations & Projects

The pulps of mandibular molars of 15 athymic and 15 conventional rats were surgically exposed and left open to their oral flora. Each group was divided into 3 subgroups of 5 animals each. The rats were sacrificed after their pulps were exposed for 2, 4, or 8 weeks. After fixing, decalcifying, and embedding, the specimens were sectioned and stained with H and E. They were then examined under a microscopic grid and quantified by percentages of surface areas of bone, connective tissue, bone marrow, intrabony spaces, periapical lesions, and numbers of osteoclasts. This was done using a DataVoice computerized data …

The Fracture Strength Of Ceramic Brackets : An Update And Comparison, Christian P. Manley

Loma Linda University Electronic Theses, Dissertations & Projects

The purpose of this study was to compare the fracture strength of ceramic brackets which are currently on the market with ceramic brackets tested in a previous study at Loma Linda. Fracture strengths of standard edgewise ceramic brackets vs. pre-torqued ceramic brackets and bicuspid ceramic brackets vs. central incisor ceramic brackets were also compared.

A total of 160 Polycrystalline brackets, 8 categories in groups if 20, were tested for fracture strength. Each bracket was tested using the same testing model that was used in the previous study at Loma Linda. The brackets were tested by torquing a wire within the …

The Accuracy Of Sonographic Imaging (Dolphintm Digigraph) And Standard Lateral Cephalometric Radiographs : A Comparative Study, Michael D. Teichman

Loma Linda University Electronic Theses, Dissertations & Projects

Radiation due to x-ray exposure is a concern, and the development of the Dolphin™ DigiGraph represents an attempt to limit this exposure. The purpose of this paper was to compare measurements (using Ricketts analysis) obtained from conventional radiographic cephalometric tracings with those obtained by computerized digitizing with the DigiGraph. Forty-six patients from the Loma Linda University School of Dentistry graduate orthodontic clinic were digitized, and the results were compared to the x-ray tracings of these patients. The results showed that seven of the twenty-one variables examined exhibited a statistical similarity between the two methods (DigiGraph and x-ray tracing). An examination …

Generating Unbiased Ratio And Regression Estimators, William (Bill) H. Williams

Publications and Research

Standard ratio and regression are only conditionally unbiased. The paper uses split sample techniques to develop unbiased versions.

Incremental Learning Of Numeric Clusters In Classifier Systems, K. R. Hacke, D. C. St. Clair

Computer Science Technical Reports

Classifier systems are knowledge-based learning algorithms which take training instances as input and produce a set of rules as output Many classifier systems represent the knowledge they learn in the form of one or more decision trees. Accurate knowledgebase systems for a variety of domains have been constructed by generating decision trees using J. R. Quinlan's (1986) inductive algorithm ID3 and P. E. Utgoffs (1988) IDS. IDS is an incremental version of ID3.

Unfortunately, all these algorithms suffer from the inability to easily and effectively handle domains with numeric-valued attributes. Numeric attributes are those whose values are taken from a …

Modeling The Software Design Project, C. C. Dziedzic, D. C. St. Clair

Computer Science Technical Reports

The information content of the software design product as needed by various user communities is identified. Definitions of design in classical engineering disciplines are investigated and then applied specifically to the area of software design. The Entity-Relationship model is used to describe the information content of the software design product. All the relationship types and entity types that compose the design product are described in detail. The Military Standard: Defense System Software Development, DOD-STD-2167A, is analyzed to determine how it meets the relationship type requirements.

Incremental Learning Of Numeric Clusters In Classifier Systems, K. R. Hacke, D. C. St. Clair

Computer Science Technical Reports

Classifier systems are knowledge-based learning algorithms which take training instances as input and produce a set of rules as output Many classifier systems represent the knowledge they learn in the form of one or more decision trees. Accurate knowledgebase systems for a variety of domains have been constructed by generating decision trees using J. R. Quinlan's (1986) inductive algorithm ID3 and P. E. Utgoffs (1988) IDS. IDS is an incremental version of ID3.

Unfortunately, all these algorithms suffer from the inability to easily and effectively handle domains with numeric-valued attributes. Numeric attributes are those whose values are taken from a …

Modeling The Software Design Project, C. C. Dziedzic, D. C. St. Clair

Computer Science Technical Reports

The information content of the software design product as needed by various user communities is identified. Definitions of design in classical engineering disciplines are investigated and then applied specifically to the area of software design. The Entity-Relationship model is used to describe the information content of the software design product. All the relationship types and entity types that compose the design product are described in detail. The Military Standard: Defense System Software Development, DOD-STD-2167A, is analyzed to determine how it meets the relationship type requirements.

Linear Operators Strongly Preserving Polynomial Equations Over Antinegative Semirings, Sang-Gu Lee

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

We characterized the group of linear operators that strongly preserve r-potent matrices over the binary Boolean semiring, nonbinary Boolean semirings, and zero-divisor free antinegative semirings. We extended these results to show that linear operators that strongly preserve r-potent matrices are equivalent to those linear operators that strongly preserve the matrix polynomial equation p(X) = X. where p(X) = X^r₁ + X^r₂ + ... + X^r_t and r₁>r₂>...>r_t≥2.

In addition, we characterized the group of linear operators that strongly preserve r-cyclic matrices over the same semirings. We …

A Comparison Of Estimation Procedures For The Beta Distribution, Huey Yan

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The beta distribution may be used as a stochastic model for continuous proportions in many situations in applied statistics. This thesis was concerned with estimation of the parameters of the beta distribution in three different situations.

Three different estimation procedures-the method of moments, maximum likelihood, and a hybrid of these two methods, which we call the one-step improvement-were compared by computer simulation, for beta data and beta data contaminated by zeros and ones. We also evaluated maximum likelihood estimation in the context of censored data, and Newton's method as a numerical procedure for solving the likelihood equations …

Datascan - April 30, 1991, Nova University

DataScan

No abstract provided.

Datascan - March 11, 1991, Nova University

DataScan

No abstract provided.

Datascan - February 18, 1991, Nova University

DataScan

No abstract provided.

Municipal Capital Maintenance And Fiscal Distress, Mary K. Bumgarner, Jorge Martinez-Vazques, David L. Sjoquist

Faculty Articles

This paper formalizes and empirically tests the hypothesis that the deficient maintenance of public infrastructure is caused by fiscal distress. We utilize a production-decision framework in which public officials combine maintenance and new capital to produce a desired level of capital services. The behavior implied in the fiscal distress hypothesis is treated as perverse deviations from the optimal production path. The empirical findings from cross-sectional expenditures data give support to the fiscal distress hypothesis.

Student Fact Book, Fall 1991, Wright State University, Office Of Student Information Systems, Wright State University

Wright State University Student Fact Books

The student fact book has general demographic information on all students enrolled at Wright State University for Fall Quarter, 1991.

Ua56/1 Fact Book, Wku Institutional Research

WKU Administration Documents

Statistical and demographic profile of WKU.

The Economic Impact Of Recreational Fishing In Western Australia., R. K. Linchner

Fisheries Management Papers

The Minister for Fisheries commissioned Economic Research Associates to carry out a study of the economic impact of recreational fishing in Western Australia. Two surveys were conducted to determine how much recreational fishers spend during the year on goods and services in order to go fishing. One involved telephone interviews of 401 recreational fishers, who were selected from a stratified random sample of households in five major regions of the state. The other survey employed a self enumeration questionnaire sent to randomly selected licensed recreational fishers, as well as being made available on non-random self-selection basis through fishing clubs and …

Shadow Casting Phenomena At Newgrange, Frank Prendergast

Articles

A digital model of the Newgrange passage tomb and surrounding ring of monoliths known as the Great Circle is used to investigate sunrise shadow casting phenomena at the monument. Diurnal variation in shadow directions and lengths are analysed for their potential use in the Bronze Age to indicate the passage of seasonal time. Computer-aided simulations are developed from a photogrammetric survey to accurately show how three of the largest monoliths, located closest to the tomb entrance and archaeologically coded GC1, GC-1 and GC-2, cast their shadows onto the vertical face of the entrance kerbstone, coded K1. The phenomena occur at …

The Relationship Between Plaintiff Sucess Rates Before Trial And At Trial, Theodore Eisenberg

Cornell Law Faculty Publications

Legal cases that reach trial are a biased subset of underlying disputes. This makes it difficult to study the legal system by observing tried cases. This paper examines the relationship between plaintiff success at pretrial motion and trial stages across many categories of cases. The large, significant positive relationship between plaintiff success rates at these two procedural stages suggests that characteristics of case categories influence outcomes at both stages. Observers of a category of tried cases or cases resolved by motion can make informed judgments about how that category of cases fares at the other procedural stage.

The Quiet Revolution In Products Liability, James A. Henderson Jr., Theodore Eisenberg

Cornell Law Faculty Publications

Most revolutions are noisy, tumultuous affairs. This is as true of significant shifts in legal doctrine as it is of shifts of political power through force of arms. Indeed, the pro-plaintiff revolution in American products liability in the early 1960s will forever be associated with heroic, martial images, epitomized in Prosser's description of the assault upon, and fall of, the fortress citadel of privity. The same sort of terminology aptly could be used to describe the last five or ten years of legislative reform activity in the various states. Reacting to what many see as "crises" brought on by courts …

The Effect Of Age Misreporting In China On The Calculation Of Mortality Rates At Very High Ages, Ansley J. Coale, Shaomin Li

Management Faculty Publications

When mortality rates by age are calculated from recorded deaths and enumerated populations, rates at higher ages are typically in error because of misstated ages. Mortality rates for China in 1981 have been calculated from the number of deaths in 1981 in each household recorded in the 1982 census, and from the census population back-projected one year. Because age was determined from date of birth, and because persons of the Chinese culture have very precise knowledge of date of birth, the mortality rates even at high ages should be unusually accurate. This expectation is fulfilled for most of China, but …

Analysis And Finite Element Approximation Of Optimal Control Problems For The Stationary Navier-Stokes Equations With Dirichlet Controls, M. D. Gunzburger, L. S. Hou, Tom Svobodny

Mathematics and Statistics Faculty Publications

Optimal control problems for the stationary Navier-Stokes equations are examined from analytical and numerical points of view. The controls considered are of Dirichlet type, that is, control is effected through the velocity field on (or the mass flux through) the boundary; the functionals minimized are either the viscous dissipation or the L4-distance of candidate flows to some desired flow. We show that optimal solutions exist and justify the use of Lagrange multiplier techniques to derive a system of partial differential equations from which optimal solutions may be deduced. We study the regularity of solutions of this system. The n, finite …

Predictive Probabilities In Employee Drug-Testing, John M. Gleason, Darold T. Barnum

RISK: Health, Safety & Environment (1990-2002)

Substance abuse in the U.S. has been estimated to cost $99 billion annually through lower productivity. Yet the authors urge caution in attempting to reduce these costs and health and safety Risks. In doing so, they cite commonly high frequencies of false negatives and false positives in employee drug tests - the latter having the potential to do great injustice to many drug-free employees.

Classification Of Newborns Based On Maturity Rating And Intrauterine Growth At The Medical College Of Virginia Hospitals, Lydia Holmes Sund

Theses and Dissertations

Nurses at the Medical College of Virginia Hospitals (MCVH) in Richmond, Virginia, use the Newborn Maturity Rating and Classification Tool to identify high risk infants. An estimate of gestational age is made and using this estimate, weight, length, and head circumference measurements are plotted on graphs on the tool to determine if the infant achieves intrauterine growth smaller, larger or equal to gestational age.

The data used to generate the graphs on the Newborn Maturity Rating and Classification Tool were collected in Colorado during the 1950's. Two nurses at MCVH questioned the use of these graphs. They wanted to know …

Estimation In A Marked Poisson Error Recapture Model Of Software Reliability, Rajan Gupta

Mathematics & Statistics Theses & Dissertations

Nayak's (1988) model for the detection, removal, and recapture of the errors in a computer program is extended to a larger family of models in which the probabilities that the successive programs produce errors are described by the tail probabilities of discrete distribution on the positive integers. Confidence limits are derived for the probability that the final program produces errors. A comparison of the asymptotic variances of parameter estimates given by the error recapture and by the repetitive-run procedure of Nagel, Scholz, and Skrivan (1982) is made to determine which of these procedures efficiently uses the test time.

Novafacts - December 28, 1990, Nova University

NovaFacts

No abstract provided.

Datascan - December 9, 1990, Nova University

DataScan

No abstract provided.

Characterization Of Matrix Variate Normal Distributions, A.K. Gupta, T. Varga

Mathematical Sciences Technical Reports (MSTR)

In this paper, it is shown that two random matrices have a joint matrix variate distribution if conditioning each one on the other the resulting distributions satisfy certain conditions. A general result involving more than two matrices is also proved.

Implementation Of The Modified Monte Carlo Technique Using Importance Sampling On The Block Oriented System Simulator, John B. Bennett

Theses and Dissertations

The purpose of this thesis was to implement the Modified Monte Carlo technique using Importance Sampling on the Block Oriented System Simulator (BOSS). Computer simulation techniques of communications systems were reviewed. Next, conventional Monte Carlo techniques and Modified Monte Carlo techniques using Importance Sampling were reviewed. Models of Binary Phase Shift Keying (BPSK) systems using both Monte Carlo techniques were implemented and simulated. Reasons for the model using Importance Sampling not working correctly are postulated. The Monte Carlo technique is a method of ensuring the an inherently infinite procedure, such as determining system bit error rate (BER), can be determined …

Novafacts - November 16, 1990, Nova University

NovaFacts

No abstract provided.