22 Matching Results

Search Results

Advanced search parameters have been applied.

An Interpreter for the Basic Programming Language

Description: In this thesis, the first chapter provides the general description of this interpreter. The second chapter contains a formal definition of the syntax of BASIC along with an introduction to the semantics. The third chapter contains the design of data structure. The fourth chapter contains the description of algorithms along with stages for testing the interpreter and the design of debug output. The stages and actions-are represented internally to the computer in tabular forms. For statement parsing working syntax equations are established. They serve as standards for the conversion of source statements into object pseudocodes. As the statement is parsed for legal form, pseudocodes for this statement are created. For pseudocode execution, pseudocodes are represented internally to the computer in tabular forms.
Date: May 1975
Creator: Chang, Min-Jye S.
Partner: UNT Libraries

An Inquiry into the Inevitability of Prediction Error in Investment Portfolio Models

Description: Many mathematical programming models of the selection of investment portfolios assume that the best portfolio at any given level of risk is the portfolio having the highest level of return. The expected level of return is defined as a linear combination of the expected returns of the individual investments contained within the portfolio,and risk is defined in terms of variance of return. This study uses Monte Carlo simulation to establish that if the estimates of the future returns on potential investments are unbiased, the steady-state return on the portfolio is overestimated by the procedure used in the standard models. Under reasonable assumptions concerning the parameters of the estimates of the various returns, this bias is quite sizeable, with the steady-state predicted return often overestimating the steady-state actual return by more than ten percentage points. In addition, it is shown that when the variances of the alternative potential investments are not all equal,a limitation on the variance of the portfolio will reduce the magnitude of the bias. In many reasonable cases, constraining the portfolio variance reduces the bias by a magnitude greater than the amount by which it reduces the predicted portfolio return, causing the steady-state actual return to rise. This implies that return cannot automatically be assumed to be a monotonic function of risk.
Date: December 1972
Creator: Valentine, Jerome Lynn
Partner: UNT Libraries

Event Order in the Biathlon Does Not Have an Effect on Metabolic Response

Description: The purpose of this study was to examine the effects of event order on a cycling(C)/running(R) or R/C biathlon. Eight experienced male biathlete/triathletes with a mean age of 24.9 + 4.6 yr formed the sample of the study. Results show no significant interaction effects on oxygen consumption peak, oxygen consumption during steady-state, ventilation, and heart rate when C/R or R/C are performed at 70% oxygen consumption peak for subsequent R and C respectively. These results seem to indicate that the biathlete/triathlete is efficient in both C and R to the extent that event order does not significantly interact with metabolic response in submaximal cycling and running.
Date: December 1990
Creator: Ledbetter, John C.
Partner: UNT Libraries

Income Concepts Used by Bank Loan Officers in a Metropolitan Environment

Description: The problem with which this study is concerned is that of the income concepts used by bank loan officers in dealing with financial information, as compared to the income concepts used by the accounting profession. A series of twenty different financial situations were designed which required the loan officer to make a decision as to an income concept before he could compute the answer to the questions in income, profit, gain, and change in wealth which were asked for in each situation. The loan officers' answers to each situation were then compared with the accountants' answers, using generally accepted accounting principles. In addition, comparisons were made between the income concepts used by the different classes of loan officers and sixteen environmental factors to determine what influence, if any, these factors might have on the answer given by the bank loan officers. The two purposes of the study were to show that bank loan officers do not calculate net income by the same methods as accountants, and to determine if there are environmental factors which would influence the method the loan officer used to compute his answers.
Date: August 1974
Creator: McGillivray, Robert E.
Partner: UNT Libraries

A Study to Determine the Impact of Unscheduled Priority Tasks on Organizational Size

Description: This study is directed to the problem of the quantitative determination of the number of additional personnel required in an organization for servicing unscheduled priority tasks without delaying the completion of scheduled tasks. The manager of an organization which has been enlarged in order to respond adequately to the random arrival of priority requests may face criticism if the organization appears to be "overstaffed" during periods when only "routine" service requirements must be met. An audit team oriented toward accounting-type data may be reluctant to accept a manager's justification of his organization's size if the justification is based primarily on nonquantitative arguments.
Date: August 1972
Creator: Chandler, William Gray
Partner: UNT Libraries

A Probabilistic Model for Evaluating Capital Investment Proposals for Petroleum Refineries

Description: The purpose of this study was to develop a probabilistic model that could be used by petroleum refiners to evaluate the economic potential of refinery capital investment proposals. The following two requirements were placed on the development at the outset: (1) that the model use linear programming to simulate refinery operations; and (2) that the model keep computer time within reasonable bounds. A probabilistic model was developed that requires the following steps for its application: (1) use linear programming to simulate both the operations of the existing refinery and the operations assuming that the investment is made; (2) select two variables that can be treated as probabilistic variables and assign either a theoretical or a subjective probability distribution to represent future values for the two variables; (3) develop return on investment interpolation data by computing a return on investment for all pair combinations of three tenth year values for each of the two probabilistic variables; (4) develop a return on investment distribution by selecting values at random from the two probability distributions and interpolating among the interpolation data to obtain return on investment data; (5) interpret the return on investment distribution. The model was applied to an actual refining situation that involved determining the expected internal rate of return of a proposed hydrocracker addition to a United States refinery. Total computer time required to evaluate the hydrocracker proposal was about 159 minutes. Accuracy of the interpolation feature of the model was also determined during the application. The average error of ten interpolated return figures that were selected at random for the accuracy check was 1.89 per cent.
Date: December 1972
Creator: Martin, William Basil, Jr.
Partner: UNT Libraries

Just-In-Time Purchasing and the Buyer-Supplier Relationship: Purchasing Performance Implications Using a Transaction Cost Analytic Framework

Description: The just-in-time purchasing literature resoundingly endorses long-term, cooperative buyer-supplier relationships. Significant anecdotal and descriptive evidence indicates that such relationships are rare in practice, raising questions as to the performance consequences of this gulf between theory and practice. Using an accepted theoretical model of the buyer-supplier relationship, transaction cost economics, this study examined the purchasing performance implications of the nature of the buyer-supplier relationship under just-in-time exchange. The focal purpose of the study was to examine the performance consequences of crafting long-term, cooperative relationships. The research design employed was a cross-sectional field study, involving a static-group comparison, implemented through the use of a mail survey. A dual-stage cluster sample of eight hundred purchasing managers and professionals employed in the two digit Standard Industrial Classification (SIC) Code 36, Electronic and Other Electrical Equipment and Components, was provided by the National Association of Purchasing Management (NAPM). The questionnaire was pretested and the substantive validity of the measurement scales assessed. Scales were purified via correlational and reliability analyses. Criterion-related and construct validity were established via correlational, exploratory factor, and confirmatory factor analyses. The three hypotheses of the study, involving extant tests of the association between the nature of the buyer-supplier relationship and purchasing performance (i.e., as reflected by transaction costs), were tested via analysis of covariance (ANCOVA) models. All three hypotheses were supported by the data to varying degrees. The confirmation of the theoretical model of the study provides empirical evidence to researchers and practitioners as to the superiority, in exchange efficiency terms, of cooperative relationships under conditions of just-in-time exchange. It may not be presumed, however, that cooperative exchange will enhance efficiency in all exchange environments.
Date: December 1996
Creator: Warnock, Stuart H. (Stuart Hamilton)
Partner: UNT Libraries

The Effect of Certain Modifications to Mathematical Programming Models for the Two-Group Classification Problem

Description: This research examines certain modifications of the mathematical programming models to improve their classificatory performance. These modifications involve the inclusion of second-order terms and secondary goals in mathematical programming models. A Monte Carlo simulation study is conducted to investigate the performance of two standard parametric models and various mathematical programming models, including the MSD (minimize sum of deviations) model, the MIP (mixed integer programming) model and the hybrid linear programming model.
Date: May 1994
Creator: Wanarat, Pradit
Partner: UNT Libraries

The Consequences of Implementing Statistical Process Control

Description: This study evaluated the changes which occur in manufacturing organizations in the plastic molding industry which implement statistical process control (SPC). The study evaluated changes in product quality, consistency, cost, changes in employee attitudes, and changes in the organization structure which occur after the implementation of SPC. The study was conducted in two phases. Phase 1 consisted of an exploratory field study of a single manufacturing company. Phase 2 consisted of a field survey of three manufacturing companies in the same industry. An unexpected opportunity to evaluate the differences in effects of successful and unsuccessful SPC implementations occurred during the field survey. One plant, whose management assessed their SPC program as being unsuccessful, reported no economic or quality benefits from SPC. Neither did this plant report any changes in the attitudes or behavior of their employees. Neither of these findings was surprising since this plant was the only one of the four study plants which implemented SPC as a quality control program with no participation from the production department. The three plants whose management assessed their SPC programs as being successful reported reduced product variation and a decrease in the proportion of defective product produced as a result of SPC. No consistent evidence was found concerning a reduction in the material required per product resulting from SPC. No consistent evidence was found linking changes in employee attitudes and behavior to the implementation of SPC. The field study found a significant change in the employees1 attitudes toward management but no change in their attitudes toward the company. The field survey found no evidence of change in either dimension. Evidence was found for a change to a more organic structure during SPC training and to a more mechanistic structure during SPC implementation. The final form of the organization was more organic than ...
Date: August 1990
Creator: Sower, Victor E.
Partner: UNT Libraries

A Study of Female Employees' Responses on an Attitude Survey

Description: This study was conducted to clarify the use of an annual attitude survey by a certain company, as it relates to that company's female employees. In previous surveys using the Job Descriptive Index, it was noted that the scatter of scores about the mean for the satisfaction with Work, Pay, Promotion, Supervisor, and Co-workers sub-tests was much greater for the females than for the males. It was postulated that the female group might be composed of two or more definable subgroups which had statistically different means. It was also shown that for satisfaction with supervisor, whites had higher satisfaction than blacks. On satisfaction with promotion, persons twenty-five years or younger scored higher than did those who were fifty-five and older, and then those who were from twenty-five to thirty-four years old. All of the above differences were statistically significant at the p < .05 level. No statistically significant differences were found in groups stratified by having dependents, or by tenure. The primary hypothesis was accepted. No subsidiary hypothesis was found acceptable by this study.
Date: May 1978
Creator: Barnard, William K.
Partner: UNT Libraries

Existing Relationships Between Enrollment Size and Methods of Financial Management in the Public Universities of Texas Participating in the Ad Valorem Tax Fund

Description: The problem of this study is to ascertain the existing relationships between enrollment size and methods of financial management in selected public institutions of higher education. The purposes set forth for this investigation are to conduct a survey of the financial management methods of a major segment of Texas higher education, to analyze the existing relationships of these financial methods with increasing enrollments ranging from 2,537 to 26,531, and to assess the implications thereof for indicators of optimum and maximum enrollments under variable methods of financial management.
Date: August 1972
Creator: Childers, Lloyd Fred
Partner: UNT Libraries

The Effect of Personality Characteristics on Information Selection, Utilization and Decision-Making

Description: The problem with which this investigation is concerned is that of determining the role of personality in information acquisition and utilization during the decision-making process, by replicating the Schkade-Scarborough box design and the Kernan-Mojena chip design, using an expanded battery of psychological tests. This investigation seeks to accomplish the following objectives: (1) review and summarize the present literature which relates personality and binary decision behavior; (2) review and summarize the present literature which relates personality with information transmission and utilization; (3) administer the Minnesota Multiphasic Personality Inventory (NMPI), the Gordon Personal Inventory (GPI), the Gordon Personal Profile (GPP), EAS j, and LA1S0 to a group of subjects who will also participate in both the box and the chip experimental designs; (4) replicate both the box and the chip experimental designs with a different set of subjects to test for consistency of findings; (5) perform canonical analysis on the box design, endeavoring to extend and refine the analysis of the data; and (6) compare the findings from the box and chip experimental designs, and identify areas for further research. The purpose of this study is twofold. The first is to replicate and test the research findings of Schkade-Scarborough and Kernan-Mojena, which suggested that there is a statistically significant relationship between decision performance, as defined by a set of decision performance metrics, and personality, as defined by a set of psychological test scales. The second purpose is to test the hypothesis that the same psychological scales which are significantly related to decision performance, as defined by the box performance metrics, are also related to decision performance, as defined by the chip performance metric.
Date: December 1972
Creator: Carothers, Samuel Gilbert, 1938-
Partner: UNT Libraries

Time-Based Manufacturing Competence and Business Performance: An Empirical Study in the Steel Minimill Industry

Description: The main research question pertains to the relationship between time-based manufacturing competence and business performance: Is there a positive relationship between time-based manufacturing competence and business performance. The objective of the study, therefore, is to examine the relationship between time -based manufacturing competence and business performance.
Date: August 1996
Creator: Al-Serhan, Yahya N. (Yahya Naser)
Partner: UNT Libraries

Robustness of the One-Sample Kolmogorov Test to Sampling from a Finite Discrete Population

Description: One of the most useful and best known goodness of fit test is the Kolmogorov one-sample test. The assumptions for the Kolmogorov (one-sample test) test are: 1. A random sample; 2. A continuous random variable; 3. F(x) is a completely specified hypothesized cumulative distribution function. The Kolmogorov one-sample test has a wide range of applications. Knowing the effect fromusing the test when an assumption is not met is of practical importance. The purpose of this research is to analyze the robustness of the Kolmogorov one-sample test to sampling from a finite discrete distribution. The standard tables for the Kolmogorov test are derived based on sampling from a theoretical continuous distribution. As such, the theoretical distribution is infinite. The standard tables do not include a method or adjustment factor to estimate the effect on table values for statistical experiments where the sample stems from a finite discrete distribution without replacement. This research provides an extension of the Kolmogorov test when the hypothesized distribution function is finite and discrete, and the sampling distribution is based on sampling without replacement. An investigative study has been conducted to explore possible tendencies and relationships in the distribution of Dn when sampling with and without replacement for various parameter settings. In all, 96 sampling distributions were derived. Results show the standard Kolmogorov table values are conservative, particularly when the sample sizes are small or the sample represents 10% or more of the population.
Date: December 1996
Creator: Tucker, Joanne M. (Joanne Morris)
Partner: UNT Libraries

Comparing the Powers of Several Proposed Tests for Testing the Equality of the Means of Two Populations When Some Data Are Missing

Description: In comparing the means .of two normally distributed populations with unknown variance, two tests very often used are: the two independent sample and the paired sample t tests. There is a possible gain in the power of the significance test by using the paired sample design instead of the two independent samples design.
Date: May 1994
Creator: Dunu, Emeka Samuel
Partner: UNT Libraries

Factors Associated with Students' Decisions to Attend Selected Private Postsecondary Christian Institutions

Description: This study was designed to compare the college choice decisions of first-year students in the fall of 1993 attending selected private Christian institutions of higher learning with a national sample of colleges. The data for the study were collected using the Entering Student Survey (ESS), published by the American College Testing program (ACT).
Date: August 1995
Creator: Turcotte, James C. (James Carlton)
Partner: UNT Libraries

Relationships Between Selected Musical Aural Discrimination Skills and a Multivariate Measure of Intellectual Skills

Description: This study attempted to explore the strength and nature of relationships between specific intellectual information processing skills included in a multi-dimensional model conceived by Guilford, and measured by Meeker's Structure of Intellect - Learning Abilities Test, and specific musical aural discrimination skills as measured by Gordon's Musical Aptitude Profile. Three research questions were posed, which involved determining the strength and the nature of the relationship between MAP melodic, rhythmic, and aesthetic discrimination abilities and the intellectual information processing skills comprising the SOI - LA. Both instruments were administered to 387 fourth, fifth, and sixth graders from schools in the Dallas area. After a pilot study established the feasibility of the study and reliability estimates of the test instruments, multiple regression analysis determined that 10% to 15% of the variance between intellectual information-processing skills and the individual musical aural discrimination abilities was in common (r = +.32 to r = +.39). It was further determined that only six specific SOI intellectual dimensions, all involving the skills of "Cognition" and "Evaluation", were significantly related to the musical aural discrimination abilities. Through the use of the Coefficient of Partial Correlation, the strength of each individual information-processing skill's unique contribution to that covariance was determined. The study indicated that "Semantic" mental information processing skills, involving the ability to recall an abstract meaning or procedure given an external stimulus, play an extremely important part within this relationship. Skills of a "Figural" nature, which involve comprehending either a physical object or an non-physical idea and separating it from other impinging stimuli also enter into the relationship, although not to so high an extent. Finally, it was observed that the dimensions involving an understanding of "Systems", those mental skills which deal with groupings of figures, symbols, or semantic relationships, also was important to the relationship.
Date: December 1986
Creator: Hornstein, Daniel L. (Daniel Lather)
Partner: UNT Libraries

The Relationship between Educators' Global Perspective and Their Receptivity to the Inclusion of Elements of Global Education in the Curriculum

Description: The purpose of this study was to determine if a significant relationship exists between teachers' and administrators' global perspective and their receptivity to the inclusion of elements of global education in the curriculum.
Date: August 1992
Creator: Meeks, Gregory B. (Gregory Brent)
Partner: UNT Libraries

Linkage of Business and Manufacturing Strategies as a Determinant of Enterprise Performance: an Empirical Study in the Textile Industry

Description: The main question in this study was: do business units that exhibit a "linkage" or "fit" between their business strategy and manufacturing strategy variables, outperform competitors who lack such a fit? This exploratory research focused on two business strategies: cost leadership and differentiation. Based on existing literature, twenty-four hypotheses concerning the relationship between business strategy and selected manufacturing strategy variables were developed. The manufacturing executives of eighty-eight broadwoven cotton fabric mills (SIC 2211) were surveyed using a qualitative questionnaire. Two sets of comparisons were made between the manufacturing strategy variables of the sampled firms: first, high vs. low performers pursuing cost leadership strategy; and second, high vs. low performers focusing on differentiation strategy. Within each set of comparisons, high performers reported linkage between their business strategies and selected manufacturing strategy variables. This study re-affirms the importance of linking business strategy with manufacturing strategy variables as a forceful weapon for overcoming competition.
Date: May 1992
Creator: Kassaee, Massoud
Partner: UNT Libraries

Radio frequency propagation differences through various transmissive materials.

Description: The purpose of this research was to determine which of the commonly used wireless telecommunication site concealment materials has the least effect on signal potency. The tested materials were Tuff Span® fiberglass panels manufactured by Enduro Composite Systems, Lexan® XL-1 polycarbonate plastic manufactured by GE Corporation and Styrofoam™ polystyrene board manufactured by The Dow Chemical Company. Testing was conducted in a double electrically isolated copper mesh screen room at the University of North Texas Engineering Technology Building in Denton, Texas. Analysis of the data found no differences exist between the radio frequency transmissiveness of these products at broadband personal communication service frequencies. However, differences in the signal do exist with regards to the angle of incidence between the material and the transmitting antenna.
Date: December 2002
Creator: Ryan, Patrick L.
Partner: UNT Libraries