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Title: An efficient method for representing and computing transitive closure over temporal relations.
Creator: Kovarik, Vincent J., Gonzalez, Avelino, Engineering
Abstract / Description: University of Central Florida College of Engineering Thesis; The need for temporal reasoning is found throughout the engineering disciplines. James Allen introduced a representation for temporal reasoning based upon the concept of intervals. This approach provides a rich set of temporal relations for reasoning over events and changes in state. The full temporal algebra is NP-complete however. The algorithm developed by Allen executes in 0(n3) time but only ensures consistency between any...
Show moreUniversity of Central Florida College of Engineering Thesis; The need for temporal reasoning is found throughout the engineering disciplines. James Allen introduced a representation for temporal reasoning based upon the concept of intervals. This approach provides a rich set of temporal relations for reasoning over events and changes in state. The full temporal algebra is NP-complete however. The algorithm developed by Allen executes in 0(n3) time but only ensures consistency between any three intervals. This research presents an approach to representing interval relations as a bit-encoded form which captures the relationships between the end-points of the intervals. A bit-algebra is then defined which provides an algorithmic method for computing transitive relations without requiring the table lookup of Allen's algorithm. By reducing the set of ambiguous interval representations to the set of relationships which have unknown temporal extent, a robust subset of the full algebra is defined which maintains the direct computation of transitive relationships.
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Date Issued: 1994
Identifier: CFR0001859, ucf:52919
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFR0001859

Title: Analysis of frequency selective surfaces with ferrite substrates.
Creator: Liu, Youcheng, Christodoulou, Christos, Engineering
Abstract / Description: University of Central Florida College of Engineering Thesis; Frequency selective surfaces (FSS) have numerous applications in several microwave and optical systems. In this work, instead of traditional dielectric substrates, ferrite substrates are used under different dc bias conditions.
Date Issued: 1996
Identifier: CFR0000784, ucf:52927
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFR0000784

Title: Numerical, image, and signal processing algorithms applied to radar rainfall estimation.
Creator: Lane, John Eugene, Kasparis, Takis, Engineering
Abstract / Description: University of Central Florida College of Engineering Thesis; The main focus of this dissertation research has been to develop and analyze methods of rain gauge and radar correlation for the purpose of optimizing rainfall estimates.
Date Issued: 2001
Identifier: CFR0000782, ucf:52926
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFR0000782

Title: Synthesis of numerical integrators for the real-time digital simulation of continuous systems.
Creator: Panzitta, Michael James, Klee, Harold I., Engineering
Abstract / Description: University of Central Florida College of Engineering Thesis; Real-time digital simulation is a powerful means for engineers and scientists in government, industry, and academia to perform research and training as well as serving as a basis for many commercial applications. Due to the special constraints imposed by digitally simulating continuous systems in real time, however, many of these systems either require costly high-speed components or are unable to provide suitable performance...
Show moreUniversity of Central Florida College of Engineering Thesis; Real-time digital simulation is a powerful means for engineers and scientists in government, industry, and academia to perform research and training as well as serving as a basis for many commercial applications. Due to the special constraints imposed by digitally simulating continuous systems in real time, however, many of these systems either require costly high-speed components or are unable to provide suitable performance characteristics using affordable computers. This dissertation describes a new technique for the synthesis of numerical integrators specifically designed for the real-time digital simulation of continuous systems. This methodology is based upon the fact that the state derivatives in a simulation model typically have a significantly limited bandwidth. This information is exploited to improve the efficiency of numerical integrators by selecting the coefficients of a general-form integrator such that it approximates an ideal integrator over the limited frequency spectrum of the state derivative.
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Date Issued: 1994
Identifier: CFR0001376, ucf:52923
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFR0001376

Title: Counterpropagation neural network detection of visual primitives.
Creator: Johnson, Cynthia Lynn, Myler, Harley R., Engineering
Abstract / Description: University of Central Florida College of Engineering Thesis; Psychological testing has shown that there is an early preattentive stage in the human visual system. At this level, simple features and properties of objects known as visual primitives are deteched spatially in parallel by groupings of cells in the visual cortex known as feature maps. In order to study this preattentive stage in a machine vision system, the biologically inspired, highly parallel architecture of the artificial...
Show moreUniversity of Central Florida College of Engineering Thesis; Psychological testing has shown that there is an early preattentive stage in the human visual system. At this level, simple features and properties of objects known as visual primitives are deteched spatially in parallel by groupings of cells in the visual cortex known as feature maps. In order to study this preattentive stage in a machine vision system, the biologically inspired, highly parallel architecture of the artificial neural network shows great promise. This paper describes how the unique architecture of the counterpropagation neural network was used to simulate the feature maps which detect visual primitives in the human visual system. The results of the research showed that artificial neural networks are able to reproduce the function of the feature maps with accuracy. The counterpropagation network was able to reproduce the feature maps as theorized, however, future research might investigate the abilities of other neural network algorithms in this area. Development of a method for combining the results of feature maps in a simulation of full scale early vision is also a topic for future research that would benefit from the results reported here.
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Date Issued: 1990
Identifier: CFR0008146, ucf:52942
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFR0008146

Title: Declines in student achievement in science-- implications for public education.
Creator: Hogan, Robert P., McLain, Nannette, Education
Abstract / Description: University of Central Florida College of Education Thesis; During the 1960s and 1970s, major innovative science curricula were introduced into public schools in the United States, and federal funds were used to improve the quality of science teachers. Nevertheless, student achievement in science has generally declined since 1963. This research focused on changes in four of the key variables related to science achievement--teachers, students, curricula, and school goals. The research examined ...
Show moreUniversity of Central Florida College of Education Thesis; During the 1960s and 1970s, major innovative science curricula were introduced into public schools in the United States, and federal funds were used to improve the quality of science teachers. Nevertheless, student achievement in science has generally declined since 1963. This research focused on changes in four of the key variables related to science achievement--teachers, students, curricula, and school goals. The research examined (a) meta-analyses of the effectiveness of the innovative science curricula on student achievement, (b) research on changes in teacher and student characteristics during the last 30 years, (c) educational literature on changes in the goals of public education during this same period, and (d) changes in student achievement. The results of this research suggest that the recent declines in science achievement are related to changes in student motivation, school goals, and school autonomy. The data indicate that contrary to the claims of some recent education commission reports, teachers and curricula have improved steadily over the last three decades. The conclusions developed from this research suggest that a number of the current educational reforms such as teacher competency testing, merit pay, curricular reform, student competency testing, and year-round schools should have little positive effect on student achievement. The research also suggests that parental involvement in education could have a negative influence on science achievement. The findings do suggest that schools of choice, corporate educational partnerships, and teacher empowerment could significantly improve student science achievement.
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Date Issued: 1990
Identifier: CFR0008144, ucf:52955
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFR0008144

Title: Closure of unlined landfills.
Creator: Westhorp, Brenda J., Reinhart, Debra R., Engineering
Abstract / Description: University of Central Florida College of Engineering Thesis
Date Issued: 1990
Identifier: CFR0008145, ucf:52954
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFR0008145

Title: Measuring and compensating for transport delay in real-time interactive driving simulation.
Creator: Dumas, Joseph D., Klee, Harold I., Engineering
Abstract / Description: University of Central Florida College of Engineering Thesis; Real-time, man-in-the-loop simulators are important tools for operator training as well as human performance research. Simulator implementation using digital computers offers many important advantages but may also cause problems. One of the most significant and troublesome artifacts of digital computer simulation is the presence of transport delays in the operator/vehicle control loop. Transport delays have been shown to destabilize...
Show moreUniversity of Central Florida College of Engineering Thesis; Real-time, man-in-the-loop simulators are important tools for operator training as well as human performance research. Simulator implementation using digital computers offers many important advantages but may also cause problems. One of the most significant and troublesome artifacts of digital computer simulation is the presence of transport delays in the operator/vehicle control loop. Transport delays have been shown to destabilize the system, resulting in poorer control of the simulated vehicle. They may also contribute to an increased likelihood of simulator sickness in human operators. Therefore, it is desirable to be able to quantify simulator transport delays and to compensate the system in such a way that delay effects on operator performance and well-being are minimized. The research presented in this dissertation involved the measurement of simulator transport delay using two different methods: a time-domain approach involving the detection of a response to a simulated step control input, and a frequency-domain approach involving the measurement of phase shift from a simulated sinusoidal input. Algorithmic compensators (digital filters) were developed to provide phase lead to counteract the system transport delay. Two compensators designed using approaches previously described in the literature canceled out delay reasonably well; however, a new compensator design developed by the author provided more nearly ideal phase performance without introducing unwanted side effects such as visual jitter. The transport delay measurement and compensation techniques were applied to a low-cost, real-time interactive automobile driving simulator developed at the University of Central Florida. The investigations using both measurement techniques revealed that a substantial amount of delay was present in the system. The three delay compensators implemented in the simulator were found (by reapplication of the frequency-domain or steady-state delay measurement technique) to operate approximately as designed. Finally, a driver-in-the-loop experiment was conducted to assess the effect of delay compensation on driver/vehicle performance. While the small size of the experiment allowed no definite conclusions to be drawn regarding the efficacy of compensation, trends in the data were generally indicative of better performance with compensation.
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Date Issued: 1993
Identifier: CFR0000192, ucf:52933
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFR0000192

Title: Design and applications of volume holographic optical elements.
Creator: Dunn, Steven C., Moharam, M.G., Engineering
Abstract / Description: University of Central Florida College of Engineering Thesis; Volume gratings were studied both theoretically and experimentally in order to design and analyze practical volume holographic optical elements. The diffraction of finite (Gaussian) beams by transmission gratings is investigated.
Date Issued: 2001
Identifier: CFR0000781, ucf:52930
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFR0000781

Title: Finite impulse response utilizing the principles of superposition.
Creator: Carter, Scott Edward, Malocha, Donald C., Engineering
Abstract / Description: University of Central Florida College of Engineering Thesis; Window functions have been greatly utilized in the synthesis of finite impulse response (FIR) filters implemented using surface acoustic wave (SAW) devices. The critical parameter in any FIR design in the impulse response length, which must be optimized for the given design specifications in order to reduce the size of each device. To this end, many design algorithms have been introduced such as Remez exchange, linear programming,...
Show moreUniversity of Central Florida College of Engineering Thesis; Window functions have been greatly utilized in the synthesis of finite impulse response (FIR) filters implemented using surface acoustic wave (SAW) devices. The critical parameter in any FIR design in the impulse response length, which must be optimized for the given design specifications in order to reduce the size of each device. To this end, many design algorithms have been introduced such as Remez exchange, linear programming, and least mean squares. A new algorithm has been derived which is efficient and accurate for the design of arbitrary filter specifications requiring less computations than the current algorithms. The FIR design is applicaable to general SAW filter design and allows two weighted transducers to be designed in a near optimal method without the need to perform zero aplitting of de-convolution. The thesis first provides the definition of the window functions used for the design process. Then the overview of the design process is discussed using a flowchart of the modeling program for designing and FIR without tranducer separation and sample simulation is presented. Next, the effects of monotonically increasing sidelobes on the transition bandwidth are discussed. This is followed by a discussion of the addition of arbitary phase to the filter design requirements. Next, the separation of the response into a two transducer design utilizing the two window function series is explained. Finally, the results are discussed and compared with other design techniques.
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Date Issued: 1995
Identifier: CFR0000186, ucf:52937
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFR0000186

Title: A design for implementing a simulation for training school principals in decision-making utilizing videodisc technology.
Creator: Wright, Robert Henry, Bozeman, William C., Education
Abstract / Description: University of Central Florida College of Education Thesis; The purpose of the study was to design a simulation using apersonal computer-based authoring system that could serve as a vehicle for investigating decision-making styles of educational administrators. The program was designed to be used at the graduate level for students seeking advanced degrees in educational leadership. The simulation makes use of simulation techniques for controlling presentation of material and data collection...
Show moreUniversity of Central Florida College of Education Thesis; The purpose of the study was to design a simulation using apersonal computer-based authoring system that could serve as a vehicle for investigating decision-making styles of educational administrators. The program was designed to be used at the graduate level for students seeking advanced degrees in educational leadership. The simulation makes use of simulation techniques for controlling presentation of material and data collection for subequent analysis about information search and utilization procedures of administrators. The study was undertaken to demonstrate that nontechnical personnel using state-of-the-art technology could develop affordable and effective multimedia simulations. The study was also designed to demonstrate that technology was sufficiently advanced that time to develop such a program would not preclude its use. Data were gathered from seven graduate students attending a introductory graduate course. Other sources of data included practicing unitersity professors, district administrators practicing principles. Data were gathered using a survey and personal interviews. Results of the survey indicated that respondents found that the technical approach was innovative and could be useful in teaching graduate students how to be better principals. District administrators expressed interest in using the program to evaluate candidates for beginning principalships.
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Date Issued: 1993
Identifier: CFR0008172, ucf:53080
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFR0008172

Title: A study to determine which factors contribute to the implementation of a successful primary multiage/nongraded program.
Creator: Osborne, Vicki Hils, Pawlas, George E., Education
Abstract / Description: University of Central Florida College of Education Thesis; Child growth and development pedagogy suggests that not all children are ready to learn the same thing, at the same time, in the same way. Multiage/nongraded programs allow pupils to advance from one concept or skill level to the next as they are ready, regardless of age or grade, which results in continuous progress. Multiage/nongraded education has a solid foundation or research and experience to support its use. However, many...
Show moreUniversity of Central Florida College of Education Thesis; Child growth and development pedagogy suggests that not all children are ready to learn the same thing, at the same time, in the same way. Multiage/nongraded programs allow pupils to advance from one concept or skill level to the next as they are ready, regardless of age or grade, which results in continuous progress. Multiage/nongraded education has a solid foundation or research and experience to support its use. However, many questions still exist regarding the factors that contribute to the implementation of a successful primary multiage/nongraded program. The purpose of this ethnographic study was to identify the (a) critical attributes of a successful multiage/nongraded program, (b) strategies necessary for successful implementation, (c) inservice training needed by teachers, (d) obstacles encountered during implentation, (e) advantages and disadvantages of a multiage/nongraded program for students, and (f) advantages and disadvantages of a multiage/nongraded program for teachers. Data from 58 teachers of primary multiage classes in a large public school district in central Florida were collected during the 1995-96 school year using focus group interviews. An Interview Guide and a demographic questionnaire were developed to help gather data. Data collection procedures for this ethnographic study utilized a series of focus groups, field notes, and audiotape recordings. Data from the interviews were catagorized, analyzed, interpreted, and summarized. Two of the critical attributes of a multiage/nongraded program discussed in this study were developmentally appropriate practices and continuous progress. Other critical attributes included authentic assessment, team teaching, and varied instructional strategies such as integrated thematic teaching and whole language. Implementation strategies discussed were the decision-making process involved in choosing to implement the multiage/nongraded program, the selection of the multiage teacher, professional development activities, student selection, and parental involvement. A large portion of the study was devoted to a discussion of the obstacles encountered during implementation of the multiage/nongraded program. Advantages and disadvantages of a multiage setting for students and teachers were discussed in the review of literature and in the data analysis of participants' responses during the interviews. Implications for practice were included. A list of recommendations for future study was also included.
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Date Issued: 1996
Identifier: CFR0008170, ucf:53075
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFR0008170

Title: Semantic correlation of behavior for the interoperability of heterogeneous simulations.
Creator: Dean, Christopher James, Gonzalez, Avelino J., Engineering
Abstract / Description: University of Central Florida College of Engineering Thesis; A desirable goal of military simulation training is to provide large scale or joint exercises to train personnel at higher echelons. To help meet this goal, many of the lower echelon combatants must consist of computer generated forces with some of these echelons composed of units from different simulations. The object of the research described is to correlate the behaviors of entities in different simulations so that they can...
Show moreUniversity of Central Florida College of Engineering Thesis; A desirable goal of military simulation training is to provide large scale or joint exercises to train personnel at higher echelons. To help meet this goal, many of the lower echelon combatants must consist of computer generated forces with some of these echelons composed of units from different simulations. The object of the research described is to correlate the behaviors of entities in different simulations so that they can interoperate with one another to support simulation training. Specific source behaviors can be translated to a form in terms of general behaviors which can then be correlated to any desired specific destination simulation behavior without prior knowledge of the pairing. The correlation, however, does not result in 100% effectiveness because most simulations have different semantics and were designed for different training needs. An ontology of general behaviors and behavior parameters, a database of source behaviors written in terms of these general behaviors with a database of destination behaviors. This comparison is based upon the similarity of sub-behaviors and the behavior parameters. Source behaviors/parameters may be deemed similar based upon their sub-behaviors or sub-parameters and their relationship (more specific or more general) to destination behaviors/parameters. As an additional constraint for correlation, a conversion path from all required destination parameters to a souce parameter must be found in order for the behavior to be correlated and thus executed. The length of this conversion path often determines the similarity for behavior parameters, both source and destination. This research has shown, through a set of experiments, that heuristic metrics, in conjunction with a corresponding behavior and parameter ontology, are sufficient for the correlation of heterogeneous simulation behavior. These metrics successfully correlated known pairings provided by experts and provided reasonable correlations for behaviors that have no corresponding destination behavior. For different simulations, these metrics serve as a foundation for more complex methods of behavior correlation.
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Date Issued: 1996
Identifier: CFR0008169, ucf:53071
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFR0008169

Title: Emissions of hexavalent chromium from hard chromium plating operations.
Creator: Hall, Mitchell Scott, Wayson, Roger L., Engineering
Abstract / Description: University of Central Florida College of Engineering Thesis; This research addressess emissions of hexavalent chromium mist from hard chromium electroplating operations. Most of these emissions are typically captured by a ventilation stack and directed to a pollution control device; those which escape capture are called fugitive emissions. Releases of toxic materials such as hexavalent chromium must be reported annually to the Environmental Protection Agency (EPA) under provisions of the...
Show moreUniversity of Central Florida College of Engineering Thesis; This research addressess emissions of hexavalent chromium mist from hard chromium electroplating operations. Most of these emissions are typically captured by a ventilation stack and directed to a pollution control device; those which escape capture are called fugitive emissions. Releases of toxic materials such as hexavalent chromium must be reported annually to the Environmental Protection Agency (EPA) under provisions of the Superfund Amendments and Reauthorization Act (SARA) Title III of 1986 via the Toxic Release Inventory (TRI), Form R. The objectives were: (1) to provide estimates of fugitive hexavalent chromium emissions for the completion of Form R; and (2) to develop a predictive model for stack and fugitive emissions versus process and ventilation parameters. The database for stack emissions included published results from EPA studies. Fugitive release data were generated by field characterization at two operating facilities. Supplemental data for stack releases were also obtained during this field activity. The fugitive releases were documented to represent a small portion of the total atmospheric discharge; in most instances, the fugitive releases were less than the detection capability of the smapling/analytical protocols. Stack releases were successfully correlated with a measure of production activity (ampere-hours), production capacity (mass of chromium in the process bath), tank dimensions (plating bath surface area), and ventilation efficiency (ventilation slot area). This effort was supported by the EPA in the form of a cooperative agreement with the American Electropaters and Surface Finishers Society (AESF).
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Date Issued: 1992
Identifier: CFR0008174, ucf:53062
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFR0008174

Title: Assessing the effects of a program to improve questioning skills of nurse educators in clinical post-conferences: an initial study.
Creator: Wink, Diane M., Kysilka, Marcella, Education
Abstract / Description: University of Central Florida College of Education Thesis; The use of cognitively high level questions, those classified in Bloom's taxonomy at the application level and above, has been suggested as a teaching strategy which will help students develop critical thinking abilities. This study was designed to determine the effect of a program to teach nursing faculty how to ask cognitively high level questions. A convenience sample was used. Subjects in the treatment (N=10) and control (N=4)...
Show moreUniversity of Central Florida College of Education Thesis; The use of cognitively high level questions, those classified in Bloom's taxonomy at the application level and above, has been suggested as a teaching strategy which will help students develop critical thinking abilities. This study was designed to determine the effect of a program to teach nursing faculty how to ask cognitively high level questions. A convenience sample was used. Subjects in the treatment (N=10) and control (N=4) groups were faculty and the students in their clinical laboratory groups from four National League for Nursing accredited undergraduate nursing programs in the state of Florida. Pre- and post-intervention data on the cognitive level of questions asked in clinical post-conferences were collected by way of audiotapes recorded during the Fall 1991 semester. Members of the treatment group received an intervention which included and inservice class, subsequent feedback on questioning patterns, and a one hour seminar. Cognitive level of questions was coded using the Teacher Pupil Questioning Inventory. Descriptive statistics were used to compare data on the treatment and control group faculty and student percentages of cognitively high level questions. The significance of difference between groups was determined with the Mann-Whitney U Test. Prior to the intervention, faculty in the treatment group asked less cognitively high level questions than control group faculty. This difference was not staistically significant. After faculty in the treatment group participated in the intervention, their percentage of cognitively high level questions was higher than teh percentage for the control group. The difference was staistically significant (p=.012). Prior to the intervention, students in the treatment group asked less cognitively high level questions than control group students. This difference was not statistically significant. After treatment group faculty particpated in ther intervention, the percentage of congitively high level questions asked by students in their clinical groups dropped. The difference between percentages of cognitively high level questions asked by students in the treatment and control groups was still not statistically significant.
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Date Issued: 1992
Identifier: CFR0008175, ucf:53065
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFR0008175

Title: Using electronic portfolios to archive student performance.
Creator: Olmstead, Phyllis M., Siebert, Barry W., Education
Abstract / Description: University of Central Florida College of Education Thesis; This study regards the use of portfolios for evaluating and documenting student progress and performance. In consideration of the far reaching and global nature of education, the researcher included educators from both the United States and other countries. Based upon the great importance that many countries and states have placed upon servicing students by alternative means, the population sample examined included 500 teachers...
Show moreUniversity of Central Florida College of Education Thesis; This study regards the use of portfolios for evaluating and documenting student progress and performance. In consideration of the far reaching and global nature of education, the researcher included educators from both the United States and other countries. Based upon the great importance that many countries and states have placed upon servicing students by alternative means, the population sample examined included 500 teachers instructing by both conventional and distance education modalities. Many current educational reform measures and legislative issues concern the attainment of job skills; therefore, both vocational and non-vocational instructors were included in the study. Examined in the study are the media utilized in retaining portfolios (paper, product samples, audio/video tape recordings, computer diskette files, electronic mail files) by both conventional and distance education instructors. Paper and product samples in portfolios are considered as non-electronic methods for archiving student work. Audio and video tape recording, computer files, and electronic mail files are considered electronic methods for portfolio archiving. Distance education and vocational educators, respectively, are examined for the use of electronic and non-electronic portfolios. A six question instrument was developed and a pilot study was conducted. The instrument included a question on whether or not the instructor used portfolios and a written description of the type of portfolio currently used. Those educators indicating the use of portfolios then classified, by type, the methods used in maintaining the portfolios. The respondents were further asked if they taught by distance education modalities. An additional questions ascertained the forms of distance education used to provide instruction. A final question asked the respondent to list the program or subject that she/he taught the majority of the time. Findings indicate that approximately 40% of the educators surveyed use portfolios, but several of the respondents indicated the implementation of portfolios in the near future. No difference was found to exist between the use of electronic and non-electronic portfolios among teachers using portfolios. The same was true for both distance educators and vocational instructors using portfolios.
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Date Issued: 1994
Identifier: CFR0008171, ucf:53066
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFR0008171

Title: Design and construction of maintainable knowledge bases through effective use of entity-relationship modeling techniques.
Creator: Pike, William Yancey, Khajenoori, Soheil, Engineering
Abstract / Description: University of Central Florida College of Engineering Thesis; The use of an accepted logical database design tool, Entity-Relationship Diagrams (E-RD), is explored as a method by which conceptual and pseudo-conceptual knowledge bases may be designed. Extensions to Peter Chen's classic E-RD method which can model knowledge structure used by knowledge-based applications are explored. The use of E-RDs to design knowledge bases is proposed as a two-stage process. In the first stage, and E-RD,...
Show moreUniversity of Central Florida College of Engineering Thesis; The use of an accepted logical database design tool, Entity-Relationship Diagrams (E-RD), is explored as a method by which conceptual and pseudo-conceptual knowledge bases may be designed. Extensions to Peter Chen's classic E-RD method which can model knowledge structure used by knowledge-based applications are explored. The use of E-RDs to design knowledge bases is proposed as a two-stage process. In the first stage, and E-RD, termed the Essential E-RD, is developed of the realm of the problem or enterprise being modeled. The Essential E-RD is completely independent of any knowledge representation model (KRM) and is intended for the understanding of the underlying conceptual entities and relationships in the domain of interest. The second stage of the proposed design process consists of expanding the Essential E-RD. The resulting E-RD, termed the Implementation E-RD, is a network of E-RD-modeled KRM constructs and will provide a method by which the proper KRM may be chosen and the knowledge base may be maintained. In some cases, the constructs of the Implementation E-RD may be mapped directly to a physical knowledge base. Using the proposed design tool will aid in both the development of the knowledge base and its maintenance. The need for building maintainable knowledge bases and problems often encountered during knowledge base construction will be explored. A case study is presented in which this tool is used to design a knowledge base. Problems avoided by the use of this method are highlighted, as are advantages the method presents to the maintenance of the knowledge base. Finally, a critique of the ramifications of this research is presented, as well as needs for future research.
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Date Issued: 1993
Identifier: CFR0008173, ucf:53064
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFR0008173

Title: Analysis of threaded joint behavior in an airbag module assembly.
Creator: Chemat, Rustam, Hagedoorn, A. Henry, Engineering
Abstract / Description: University of Central Florida College of Engineering Thesis; While some of think of our cars as simply "buckets of bolts", the proper design choices, applications, and assemblies of threaded fasteners/bolted joints play critical roles in automobile safety. Supplemental Restraint Systems (SRS), more commonly known as airbags, help prevent vehicle occupants from being thrown forward into the dashboard or windshield in the event of a collision. The components comprising the airbag, the inflator,...
Show moreUniversity of Central Florida College of Engineering Thesis; While some of think of our cars as simply "buckets of bolts", the proper design choices, applications, and assemblies of threaded fasteners/bolted joints play critical roles in automobile safety. Supplemental Restraint Systems (SRS), more commonly known as airbags, help prevent vehicle occupants from being thrown forward into the dashboard or windshield in the event of a collision. The components comprising the airbag, the inflator, the backing plate, and the cover are connected to each other, and to the vehicle, through a series of threaded fasteners. Proper and timely deployment of the airbag depends largely on the selection of suitable threaded fasteners at the design stage, appropriate fastener application, and strict adherence to the module assembly process. Selecting suitable fasteners and applying fasteners appropriately requires and understanding of basic fastener concepts: thread definitions, fastener loading terms, stress and strength, and joint failure modes. Knowledge of torque, preload, torque equations, and torque control also is necessary before proper selection and application can occur. The Case Study examines a drivers' side airbag module currently used on a vehicle marketed in the United States and, employing applicable design equations, determines 1.) if the design selction of the threaded fasteners is appropriate, 2.) how the threaded fasteners behave during and after airbag assembly, and during airbag deployment, and 3.) the potential problems arising from loose or missing fasteners. The thesis concludes the design and selection of the fasteners used in the airbag module concurs with the basic principles of threaded joints. Through the cases selected for the modules, the thesis generates several conditions that must be met to prevent joint failures. It is proposed that this research be used to further determine both the design selection of threaded fasteners and the assembly processes of automotive airbag manufacturing.
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Date Issued: 1996
Identifier: CFR0010870, ucf:53054
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFR0010870

Title: The effect of water immersion on lactic acid kinetics during swimming interval training recovery periods.
Creator: Morris, Richard P., Rohter, Frank D., Education
Abstract / Description: University of Central Florida College of Education Thesis; The purpose of the study was to determine the difference in the circulation of lactic acid following high intensity swimming, between resting immersed in water or resting sitting on the pool deck, completely out of the water. Six (four male and two female) collegiate swimmers volunteered for the study. The swimmers were randomly assigned to two groups and a counterbalance design was employed, were each group experienced both...
Show moreUniversity of Central Florida College of Education Thesis; The purpose of the study was to determine the difference in the circulation of lactic acid following high intensity swimming, between resting immersed in water or resting sitting on the pool deck, completely out of the water. Six (four male and two female) collegiate swimmers volunteered for the study. The swimmers were randomly assigned to two groups and a counterbalance design was employed, were each group experienced both treatments (one resting out of the water, one resting in the water), in different orders. Each swimmer completed an identical warm-up and them swam five 100 yard swims at 85-95% intensity, with one group resting three minutes between 100 yard swims sitting upright on the pool deck, and the other group remaining immersed in water for the three minute rest interval. Blood samples were taken during the second minute of the rest intervals, following the first, third and fifth swims. analysis of the samples was conducted with a YSI 231 Lactate Analyzer. Results showed that the swimmers had higher levels of circulating lactic acid following the first swim when the remained in the water. All six swimmers then showed a rapid inflection of lactic acid levels between the first and third trail when out of the water for the rest intervals. Lactic acid levels showed only a slight increase when the swimmers remained in the water during rest. REsults of the study showed a distinct difference in the circulatory patterns of lactic acid in swimmers following high intensity swimming between rest taken out of the water and in the water. The limitations due to sample size and training background were discussed. Implications for training design were proposed.
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Date Issued: 1997
Identifier: CFR0010874, ucf:53050
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFR0010874

Title: Analysis of parental choice : Islamic school enrollment in Florida.
Creator: Elkhaldy, Feryal Y., Kysilka, Marcella, Education
Abstract / Description: University of Central Florida College of Education Thesis; The purpose of this study was to discover and interpret reasons Florida parents enrolled their children in Islamic schools. A selection of 30 parents from 3 different schools in Florida were interviewed by the researcher using a semistructured interview guide which used both oral and written responses. The sample was matched according to the gender of parents interviewed - 15 mothers and 15 fathers were interviewed. the sample was...
Show moreUniversity of Central Florida College of Education Thesis; The purpose of this study was to discover and interpret reasons Florida parents enrolled their children in Islamic schools. A selection of 30 parents from 3 different schools in Florida were interviewed by the researcher using a semistructured interview guide which used both oral and written responses. The sample was matched according to the gender of parents interviewed - 15 mothers and 15 fathers were interviewed. the sample was matched according to the gender of the referent child. Out of 30 referent children, 15 were female and 15 were male. The researcher included children of all grade levels. Fifteen were from primary grades (1-5) and 15 were from secondary grades (6-12). The researcher served as the primary instrument for data collection. Data were summarized and reported in a descriptive format addressing each research question. Results indicated that the first reason for choosing Islamic schools was religious; the second reason was sociocultural and the last reason was academic. Many parents who enrolled their children in Islamic schools strongly envisioned the need to create schools where children could pursue the Islamic knowledge, preserve Islamic identity and develop the Islamic personality. Parents wanted the guard and shield their progeny from the negative influence (violence, drugs, promiscuity, prejudice, etc.) of the public schools. The academic concern was not a major reason for the majority of responding parents. A significant finding affirmed that Islamic education does not separate between religious and social factors. Findings indicated that parents were more attracted to Islamic schools than dissatisfied with public schools. Muslim parents were concerned with retaining their children's identity and religious commitment. At the same time, they wanted them to learn in a safe environment which galvanized them against negative effects of the dominant culture, and be able to survive the tide of assimilation, secular pressure and moral deterioration.
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Date Issued: 1996
Identifier: CFR0008180, ucf:53056
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFR0008180

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