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Finite element modeling for dislocation generation in semiconductor crystals grown from the melt
Title
Finite element modeling for dislocation generation in semiconductor crystals grown from the melt.
Creator
Zhu, Xinai., Florida Atlantic University, Tsai, Chi-Tay, College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
Abstract/Description
Dislocations in Gallium Arsenide (GaAs) and Indium Phosphide (InP) single crystals are generated by excessive stresses that are induced during the crystal growth process, and the fabrication and packaging of microelectronic devices/circuits. The presence of dislocations has adverse effects on the performance, lifetime and reliability of the GaAs and InP-based devices/circuits. It is well known that dislocation density can be significantly reduced by doping impurity atoms into the GaAs and InP...
Show moreDislocations in Gallium Arsenide (GaAs) and Indium Phosphide (InP) single crystals are generated by excessive stresses that are induced during the crystal growth process, and the fabrication and packaging of microelectronic devices/circuits. The presence of dislocations has adverse effects on the performance, lifetime and reliability of the GaAs and InP-based devices/circuits. It is well known that dislocation density can be significantly reduced by doping impurity atoms into the GaAs and InP crystal and/or decreasing the thermal stresses in these crystals during their growth process. In order to reduce the dislocation density generated in the GaAs and InP crystals, the influence of crystal growth parameters and doping impurity atoms on the dislocations reduction in GaAs and InP crystals has to be understood. Therefore, a transient finite element model was developed to simulate the dislocation generation in GaAs and InP crystals grown from the melt. A viscoplastic constitutive equation that couples a microscopic dislocation density with a macroscopic plastic deformation is employed to formulate this transient finite element model, where the dislocation density is considered as an internal state variable and the doping impurity is represented by a drag-stress in this constitutive model. GaAs and InP single crystals grown by the vertical gradient freeze (VGF) process were adopted as examples to study the influences of doping impurity and growth parameters on dislocations generated in these grown crystal. The calculated results show that doping impurity can significantly reduce dislocation generation and produces low-dislocation-density or dislocation free GaAs and InP single crystals. It also shows that the dislocations generated in GaAs and InP crystals increase as the crystal diameter and imposed temperature gradient increase, but do not change or increase slightly as the crystal growth rate increases. Therefore, this finite element model can be effectively used by crystal growers to select acceptable levels of doping impurity, crystal diameter, temperature gradient, and growth rate to produce the lowest dislocation density in GaAs and InP crystals through a thorough numerical investigation using this developed finite element model.
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Date Issued
2004
PURL
http://purl.flvc.org/fcla/dt/12072
Subject Headings
Dislocations in crystals, Gallium arsenide semiconductors, Indium phosphide, Metal crystals--Growth
Format
Document (PDF)
Feasibility of target tracking for high speed high seas cargo transfer
Title
Feasibility of target tracking for high speed high seas cargo transfer.
Creator
Tucker, Glenn C., Florida Atlantic University, Driscoll, Frederick R., College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
Abstract/Description
At sea cargo transfer has historically been a logistical challenge for both the military and the offshore industry. Even in moderate seas, three to five foot wave heights, extreme pendulations of cargo and large relative motions between vessels can occur that halts cargo transfer activities. This work develops a six-degree-of-freedom rigid crane dynamics model that is used to investigate the feasibility of crane target tracking which could extend and enhance offshore crane operations. A...
Show moreAt sea cargo transfer has historically been a logistical challenge for both the military and the offshore industry. Even in moderate seas, three to five foot wave heights, extreme pendulations of cargo and large relative motions between vessels can occur that halts cargo transfer activities. This work develops a six-degree-of-freedom rigid crane dynamics model that is used to investigate the feasibility of crane target tracking which could extend and enhance offshore crane operations. A double girder crane system is developed that easily adapts to different configurations and efficiently supports long reach heavy lift applications. Target tracking is feasible in sea states up to 5 when using the double girder crane. When compared to a present crane system, the target tracking crane requires, on average, only 3.65% more absolute total system power and 13.4% less continuous power, indicating that the proposed system should be realizable.
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Date Issued
2006
PURL
http://purl.flvc.org/fcla/dt/13388
Subject Headings
Cargo handling, Unitized cargo systems, Signal processing--Digital techniques, Ocean circulation--Mathematical models
Format
Document (PDF)
Finite element methods for stochastic structures and conditional simulation
Title
Finite element methods for stochastic structures and conditional simulation.
Creator
Ren, Yongjian., Florida Atlantic University, Elishakoff, Isaac, College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
Abstract/Description
This dissertation deals with the non-perturbative finite element methods for stochastic structures and conditional simulation techniques for random fields. Three different non-perturbative finite element schemes have been proposed to compute the first and second moments of displacement responses of stochastic structures. These three methods are based, respectively, on (i) the exact inverse of the global stiffness matrix for simple stochastic structures; (ii) the variational principles for...
Show moreThis dissertation deals with the non-perturbative finite element methods for stochastic structures and conditional simulation techniques for random fields. Three different non-perturbative finite element schemes have been proposed to compute the first and second moments of displacement responses of stochastic structures. These three methods are based, respectively, on (i) the exact inverse of the global stiffness matrix for simple stochastic structures; (ii) the variational principles for statically-determinate beams; and (iii) the element-level flexibility for general stochastic statically indeterminate structures. The non-perturbative finite element method for stochastic structures possesses several advantages over the conventional perturbation-based finite element method for stochastic structures, including (i) applicability to large values of the coefficient of variation of random parameters; (ii) convergence to exact solutions when the finite element mesh is refined; (iii) requirement of less statistical information than that demanded by the high-order perturbation methods. Conditional simulation of random fields has been an extremely important research field in most recent years due to its application in urban earthquake monitoring systems. This study generalizes the available simulation technique for one-variate Gaussian random fields, conditioned by realizations of the fields, to multi-variate vector random field, conditioned by the realizations of the fields themselves as well as the realizations of the fields derivatives. Furthermore, a conditional simulation for non-Gaussian random fields is also proposed in this study by combining the unconditional simulation technique of non-Gaussian fields and the conditional simulation technique of Gaussian fields. Finally, the dissertation incorporates the simulation technique of random field into the non-perturbation finite element method for stochastic structures, to handle the cases where only one-dimensional probability density function and the correlation function of the random parameters are available, the demanded two-dimensional probability density function is unavailable. Simulation technique is applied to generate the samples of random fields which are used to estimate the correlation between flexibilities over elements. The estimated correlation of flexibility is then used in finite element analysis for stochastic structures. For each proposed approach, numerous examples and numerical results have been implemented.
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Date Issued
1998
PURL
http://purl.flvc.org/fcla/dt/12580
Subject Headings
Finite element method, Stochastic processes, Random fields--Mathematical models
Format
Document (PDF)
Finite element analysis of inhomogeneous waveguides
Title
Finite element analysis of inhomogeneous waveguides.
Creator
Dervain, Suzanne Tai., Florida Atlantic University, Sadiku, Matthew
Abstract/Description
In this thesis, discretized finite element equations were derived and applied to the solution of electromagnetic fields in homogeneous and inhomogeneous waveguides. To improve the accuracy of the results several approaches were taken. Higher order elements were first introduced in the finite element formulation, then a penalty function was applied with explicit boundary conditions, which limit the appearance of nonphysical solutions. The results obtained from the finite element analysis were...
Show moreIn this thesis, discretized finite element equations were derived and applied to the solution of electromagnetic fields in homogeneous and inhomogeneous waveguides. To improve the accuracy of the results several approaches were taken. Higher order elements were first introduced in the finite element formulation, then a penalty function was applied with explicit boundary conditions, which limit the appearance of nonphysical solutions. The results obtained from the finite element analysis were compared to analytical results when available and found to be very accurate.
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Date Issued
1988
PURL
http://purl.flvc.org/fcla/dt/14448
Subject Headings
Finite element method, Wave guides
Format
Document (PDF)
Finite element modeling of dislocation multiplication in microelectronic and optoelectronic devices/circuits
Title
Finite element modeling of dislocation multiplication in microelectronic and optoelectronic devices/circuits.
Creator
Wang, Xueming., Florida Atlantic University, Tsai, Chi-Tay, College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
Abstract/Description
Two-dimensional and three-dimensional methodologies are developed to determine the dislocation multiplication in microelectronic and optoelectronic devices/circuits. A two-dimensional finite element code is developed to simulate the dislocation multiplication in microelectronic and optoelectronic devices/circuits. Example two-dimensional analyses are performed and analysis results are presented. The three-dimensional methodology is successfully implemented using ANSYS APDL Language within the...
Show moreTwo-dimensional and three-dimensional methodologies are developed to determine the dislocation multiplication in microelectronic and optoelectronic devices/circuits. A two-dimensional finite element code is developed to simulate the dislocation multiplication in microelectronic and optoelectronic devices/circuits. Example two-dimensional analyses are performed and analysis results are presented. The three-dimensional methodology is successfully implemented using ANSYS APDL Language within the ANSYS program. A three dimensional heterojunction bipolar transistor model is generated. CFD-thermal and structural analyses are performed to determine temperature fields and dislocation densities, which are calculated as functions of time, thickness of the thermal shunt, and heat generation rates.
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Date Issued
2005
PURL
http://purl.flvc.org/fcla/dt/12182
Subject Headings
Finite element method, Computational grids, ANSYS (Computer systems), Semiconductors--Materials--Analysis
Format
Document (PDF)
Finite element analysis to study the structural behavior of an underwater acoustic tower
Title
Finite element analysis to study the structural behavior of an underwater acoustic tower.
Creator
Sambandam, Sundaresakumar., Florida Atlantic University, Case, Robert O., College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
Abstract/Description
This thesis deals with the static analysis of a three dimensional underwater acoustic tower exclusively designed and fabricated by Harbor Branch Oceanographic Institution, Ft. Pierce, Florida. A commercial finite element package COSMOS/M was used for the finite element analysis. The structural modeling as well as processing of the results was performed using GEOSTAR Ver. 1.65 interactive graphics package. The analysis was concentrated on the main instrument pipe carrying the required...
Show moreThis thesis deals with the static analysis of a three dimensional underwater acoustic tower exclusively designed and fabricated by Harbor Branch Oceanographic Institution, Ft. Pierce, Florida. A commercial finite element package COSMOS/M was used for the finite element analysis. The structural modeling as well as processing of the results was performed using GEOSTAR Ver. 1.65 interactive graphics package. The analysis was concentrated on the main instrument pipe carrying the required instruments for data acquisition. Various environmental loading induced by ocean currents, hydrostatic pressure, buoyancy and self weight of the tower have been considered in the analysis. The construction aspects of the tower as well as the finite element analysis of tower substructures are also discussed. The deflection of the tower due to the imposed loading is studied and deflection profiles are drawn.
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Date Issued
1992
PURL
http://purl.flvc.org/fcla/dt/14846
Subject Headings
Finite element method, Offshore structures, underwater acoustics--Data processing
Format
Document (PDF)
Finite valuated groups
Title
Finite valuated groups.
Creator
Holroyd, Keiko Ito, Florida Atlantic University, Richman, Fred
Abstract/Description
The concept of valuated groups, simply presented groups, and simultaneous decomposition of an abelian group and a subgroup are discussed. We classify the structure of finite valuated p-groups of order up p^4. With a refinement of a classical theorem on bounded pure subgroups, we also relate the decomposition of a finite valuated p-group to the simultaneous decomposition of a finite abelian p-group and a subgroup.
Date Issued
1996
PURL
http://purl.flvc.org/fcla/dt/15320
Subject Headings
Finite groups, Abelian groups, Abelian p-groups, Algebra, Homological
Format
Document (PDF)
Finite element modeling of composite laminates with embedded piezoelectric structures including debonding
Title
Finite element modeling of composite laminates with embedded piezoelectric structures including debonding.
Creator
Suarez, Beatriz., Florida Atlantic University, Tsai, Chi-Tay, College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
Abstract/Description
Piezoelectric sensors are one of the primary devices used in smart structures because of their capability to act as both, sensors and actuators. A finite element model has been developed to predict elastic behavior and electrical response of laminate composites with embedded piezoelectric sensors. Correlations with experimental results indicate that the model is capable of forecasting the elastic and electrical response of the structure with good accuracy. The important issue of debonding of...
Show morePiezoelectric sensors are one of the primary devices used in smart structures because of their capability to act as both, sensors and actuators. A finite element model has been developed to predict elastic behavior and electrical response of laminate composites with embedded piezoelectric sensors. Correlations with experimental results indicate that the model is capable of forecasting the elastic and electrical response of the structure with good accuracy. The important issue of debonding of any of the faces of the sensors is also studied in the current work. Finite element results indicate significant changes in the elastic response caused by debonding, as well as unreliable electrical outputs.
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Date Issued
1998
PURL
http://purl.flvc.org/fcla/dt/15603
Subject Headings
Finite element method, Piezoelectric materials, Laminated materials, Smart structures
Format
Document (PDF)
Flexible modification of biological coordination: The recruitment and suppression of degrees of freedom
Title
Flexible modification of biological coordination: The recruitment and suppression of degrees of freedom.
Creator
Buchanan, John J., Florida Atlantic University, Kelso, J. A. Scott
Abstract/Description
The dynamics of recruitment and suppression processes are studied in the coupled pendulum paradigm developed by Kugler and Turvey (1987). Experimentally, the main concern is whether pendulum motion in this task is purely planar. Theoretically, the main concern is whether one-dimensional phase equations developed originally by Haken, Kelso and Bunz (1985) and the symmetry breaking extension by Kelso, Delcolle and Schoner (1990), can capture the richness of the dynamics of this experimental...
Show moreThe dynamics of recruitment and suppression processes are studied in the coupled pendulum paradigm developed by Kugler and Turvey (1987). Experimentally, the main concern is whether pendulum motion in this task is purely planar. Theoretically, the main concern is whether one-dimensional phase equations developed originally by Haken, Kelso and Bunz (1985) and the symmetry breaking extension by Kelso, Delcolle and Schoner (1990), can capture the richness of the dynamics of this experimental model system. In experiment 1, subjects swung single hand-held pendulums in time with an auditory metronome whose frequency increased. Bifurcations from planar to spherical pendulum motion occurred at critical cycling frequencies. Typically, these frequencies were above the pendulum's eigenfrequency. Spectral measures showed that spherical pendulum motion was generated through the recruitment of wrist abduction and adduction. The spectral measures revealed that elbow flexion and extension was recruited as movement rate increased, presumably to stabilize pendulum motion. When recruited, both components frequency- and phase-entrained with the primary pendulum mover, wrist ulnar flexion-extension. In experiment 2, subjects swung coupled pendulums in either an in-phase or anti-phase coordinative mode as movement rate increased. Transitions between coordinative modes were not observed. Pattern stability, as defined by the variability of the phase relation between the pendulums, was not affected to any large degree by increasing movement rate. Bifurcations from planar to spherical motion emerged at critical cycling frequencies. Spectral measures demonstrated that this motion was generated by abduction and adduction of the wrist. Elbow flexion-extension motion was also recruited. The newly active components frequency- and phase-entrained with wrist ulnar flexion-extension. When the same neuromuscular components were recruited simultaneously, e.g., elbow motion in both arms, the components exhibited frequency- and phase-entrainment with the task defined pattern. The results demonstrate that recruitment processes stabilize the coordinative modes, thereby reducing the need to switch patterns. Both experiments revealed a much richer dynamics than ever observed in the coupled pendulum paradigm and question the application of one-dimensional phase equation models to the coupled pendulum paradigm.
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Date Issued
1996
PURL
http://purl.flvc.org/fcla/dt/12439
Subject Headings
Kinesiology, Human mechanics, Movement, Psychology of, Motor learning
Format
Document (PDF)
Finding their voice: Jewish women artists in the 19th and 20th centuries
Title
Finding their voice: Jewish women artists in the 19th and 20th centuries.
Creator
Kirchen, Anita Mary, Florida Atlantic University, Kirsch, Max H.
Abstract/Description
While Jewish women artists became active in the visual arts beginning in the mid-19th century, to date they have not been addressed as a group. This project presents a theoretical and historical overview of the work of six Jewish women artists---Rebecca Solomon, Charlotte Salomon, Helen Frankenthaler, Sonia Delaunay, Louise Nevelson, and Eva Hesse---examining their art in the context of their cultural heritage, Euro-American nationalities, social environments, life experiences, and...
Show moreWhile Jewish women artists became active in the visual arts beginning in the mid-19th century, to date they have not been addressed as a group. This project presents a theoretical and historical overview of the work of six Jewish women artists---Rebecca Solomon, Charlotte Salomon, Helen Frankenthaler, Sonia Delaunay, Louise Nevelson, and Eva Hesse---examining their art in the context of their cultural heritage, Euro-American nationalities, social environments, life experiences, and contemporary art movements. Providing both representational and nonrepresentational artists---an important factor in Jewish aesthetics---this group includes both well-recognized artists and those whose work has only recently become known. For Delaunay, Frankenthaler, Nevelson, and Hesse, this analysis provides an understanding of their artwork in light of their Jewish heritage, as opposed to the Western cultural context in which they are most often viewed. To properly examine the lives and artwork of these artists requires a multi-faceted theoretical framework. Given the history of Jewish exile, which dispersed artists among Euro-American societies, cross-cultural perspectives and analyses provide a context in which to situate their artwork. Contemporary aesthetic theories and women's art scholarship reframe the visual arts, particularly in reference to Jewish women artists. Finally, new textual methods of interpretation contribute to a broader understanding than traditional art historical practice. Since Euro-American art scholars most usually confine themselves within Western culture and aesthetics, the introduction of Jewish aesthetic history and theory provides a more appropriate structure within which to examine the work of Jewish women artists. While this sample group is small, it represents a broad historical and geographical range and examines the various ways of creating visual art within that range. This study weaves together traditional art historical models with newer theories from textual art scholarship, as well as cross-cultural and Jewish cultural studies. This use of a multi-faceted theoretical framework seeks to provide a more complete understanding of the lives and artwork of Jewish women artists, and their place within art history.
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Date Issued
2003
PURL
http://purl.flvc.org/fau/fd/FADT12045
Subject Headings
Jewish women artists--19th century, Jewish women artists--20th century, Asceticism--Judaism
Format
Document (PDF)
Flesh impressions: Television texts of cosmetic surgery and audience negotiation
Title
Flesh impressions: Television texts of cosmetic surgery and audience negotiation.
Creator
Hutton, Heather O'Neil., Florida Atlantic University, Scodari, Christine
Abstract/Description
Both incredibly personal and inherently social, cosmetic surgery procedures intended to reconfigure the body toward a more culturally acceptable physicality and the increase in television representations of the phenomenon provoke a complex debate regarding the social, psychological, medical and ethical implications of such practices. This thesis raises the question: Do television texts of cosmetic surgery and their potential consumers reproduce or challenge the hegemony of cosmetic surgery as...
Show moreBoth incredibly personal and inherently social, cosmetic surgery procedures intended to reconfigure the body toward a more culturally acceptable physicality and the increase in television representations of the phenomenon provoke a complex debate regarding the social, psychological, medical and ethical implications of such practices. This thesis raises the question: Do television texts of cosmetic surgery and their potential consumers reproduce or challenge the hegemony of cosmetic surgery as a cultural practice? Using qualitative, social scientific methodology to analyze current examples of such television texts and study viewer negotiation of these texts, the study concludes that television texts are most likely to present cosmetic surgery in ways that perpetuate hegemonic notions of beauty, and that while viewers may negotiate readings that suit their preconceived notions of cosmetic surgery, they are unlikely to condemn such messages for fear of compromising an individual's power to choose cosmetic surgery for "acceptable reasons" such as improved self-esteem or social acceptance.
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Date Issued
2004
PURL
http://purl.flvc.org/fcla/dt/13127
Subject Headings
Surgery, Plastic--Social aspects, Body image--Social aspects, Mass media--Research, Mass media--Audiences
Format
Document (PDF)
Firm-specific factors and the exchange rate exposure of multinational corporations
Title
Firm-specific factors and the exchange rate exposure of multinational corporations.
Creator
Krishnamoorthy, Anand., Florida Atlantic University, Wiley, Marilyn
Abstract/Description
This dissertation extends previous research on the exchange-rate exposure of multinational corporations. Exchange rate exposure is defined as the impact of unanticipated changes in exchange rates on stock prices. The motivation for the study lies in a fundamental discrepancy between academic research and practice: Academic research has shown that exchange-rate exposure is not priced in capital markets, but the use of financial hedging instruments designed to protect firms from unanticipated...
Show moreThis dissertation extends previous research on the exchange-rate exposure of multinational corporations. Exchange rate exposure is defined as the impact of unanticipated changes in exchange rates on stock prices. The motivation for the study lies in a fundamental discrepancy between academic research and practice: Academic research has shown that exchange-rate exposure is not priced in capital markets, but the use of financial hedging instruments designed to protect firms from unanticipated changes in exchange rates is widespread. This leads to the conclusion that exchange rate exposure is priced in equity markets and is a function of firm specific factors. This dissertation segregated firms based on various factors that might affect its exchange rate exposure. They are: A firms foreign sales characteristics, the export/import characteristics of the industry to which it belongs, the competitive structure of the firms industry, its business organization and its degree of concentration in sales. The results indicate that firms that operate in the service sector of the economy are more exposed to exchange rate risk than those that operate in the manufacturing sector. On the other hand, the degree of competition among firms in an industry does not have an impact on exchange rate exposure. The results indicate that a firms degree of concentration in foreign sales has an impact on its exchange rate exposure. These results imply that restructuring operations can reduce a firms exchange rate risk. When taken together, the results of the dissertation indicate that exchange rate is exposure is priced in capital markets and is a function of firm specific factors. These results have implications for corporate investors and managers. Corporate investors can choose portfolios that will limit their exchange rate exposure. Corporate managers can make hedging decisions for the firm based on the degree of exposure the firm faces which is a function of who it is and what it does.
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Date Issued
1999
PURL
http://purl.flvc.org/fcla/dt/12596
Subject Headings
International business enterprises, Foreign exchange, Hedging (Finance)
Format
Document (PDF)
Flannery O'Connor's prepubescents: Two on a pedestal
Title
Flannery O'Connor's prepubescents: Two on a pedestal.
Creator
Thompson, Joan Elaine., Florida Atlantic University, Pearce, Howard D.
Abstract/Description
Flannery O'Connor wrote two stories about antisocial twelve-year-old girls, who live in fractured households where they have little contact with males. In "Temple of the Holy Ghost," the unnamed child is comfortable in her perceived intellectual superiority and allows her imagination to keep her on a cerebral pedestal. The angry Sally Virginia in "A Circle in the Fire" takes refuge in a second-floor window, but later descends for a physical confrontation with three boys threatening the secure...
Show moreFlannery O'Connor wrote two stories about antisocial twelve-year-old girls, who live in fractured households where they have little contact with males. In "Temple of the Holy Ghost," the unnamed child is comfortable in her perceived intellectual superiority and allows her imagination to keep her on a cerebral pedestal. The angry Sally Virginia in "A Circle in the Fire" takes refuge in a second-floor window, but later descends for a physical confrontation with three boys threatening the secure world run by her tyrannical mother. Both girls gain spiritual knowledge: the "Temple" child comes to recognize the sanctity of the female body, while Sally Virginia discovers the familial misery inherent in all people. But Sally Virginia includes both males and females in her understanding of human suffering, while the "Temple" child remains spiritually flawed because of a smugness that equates only females with purity.
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Date Issued
1996
PURL
http://purl.flvc.org/fcla/dt/15259
Subject Headings
O'Connor, Flannery--Criticism and interpretation, Children in literature
Format
Document (PDF)
Fishes of the Kissimmee River floodplain, prior to proposed restoration
Title
Fishes of the Kissimmee River floodplain, prior to proposed restoration.
Creator
Overdorf, Tobin Rogers., Florida Atlantic University, Courtenay, Walter R. Jr.
Abstract/Description
The density and diversity of fishes of the Kissimmee River Floodplain have been affected by channelization of the Kissimmee River. Reduced hydrology, human encroachment, and overall loss of habitat appear to have reduced the level of fish diversity and density within the floodplain of the Kissimmee River. This landmark study collected vegetative habitat and fish population density and diversity data within the altered floodplain for baseline information prior to initiation of river...
Show moreThe density and diversity of fishes of the Kissimmee River Floodplain have been affected by channelization of the Kissimmee River. Reduced hydrology, human encroachment, and overall loss of habitat appear to have reduced the level of fish diversity and density within the floodplain of the Kissimmee River. This landmark study collected vegetative habitat and fish population density and diversity data within the altered floodplain for baseline information prior to initiation of river restoration activities in the form of dechannelization. Secondary studies included poecillid fecundity data as well as a localized rotenone study within the previously restored am of Pool B. Overall results of the study indicate that post restoration floodplain fish collection studies should reveal increased fish density and diversity within the expanded and restored floodplain habitat.
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Date Issued
1999
PURL
http://purl.flvc.org/fcla/dt/15736
Subject Headings
Fishes--Florida--Kissimmee River Watershed, Restoration ecology--Florida--Kissimmee River Watershed
Format
Document (PDF)
Firewall formulation driven by risk analysis
Title
Firewall formulation driven by risk analysis.
Creator
Srinivasan, Sriram, Jr., Florida Atlantic University, Pandya, Abhijit S., College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
Abstract/Description
At the turn of the new millennium, the focus of Information Technology Management turned to Information and Systems Security, as opposed to competitive advantage investment. In catering to the security needs of various firms and institutions, it is seen that different entities require varying Information Security configurations. This thesis attempts to utilize Risk Analysis, a commonly used procedure in business realms, to formulate customized Firewalls based on the specific needs of a...
Show moreAt the turn of the new millennium, the focus of Information Technology Management turned to Information and Systems Security, as opposed to competitive advantage investment. In catering to the security needs of various firms and institutions, it is seen that different entities require varying Information Security configurations. This thesis attempts to utilize Risk Analysis, a commonly used procedure in business realms, to formulate customized Firewalls based on the specific needs of a network, subsequently building an effective system following the "Defense in Depth" strategy. This is done by first choosing an efficient Risk Analysis model which suits the process of creating Firewall policies, and then applying it to a particular case study. A network within Florida Atlantic University is used as an experimental test case, and by analyzing the traffic to which it is subject while behind a single Firewall layer, a specific Security Policy is arrived at and implemented.
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Date Issued
2006
PURL
http://purl.flvc.org/fcla/dt/13348
Subject Headings
Computer networks--Security measures, Electronic data processing departments--Security measures, Firewalls (Computer security), Risk assessment
Format
Document (PDF)
Flannery O'Connor's concern for truth: Aristotelian and phenomenological implications
Title
Flannery O'Connor's concern for truth: Aristotelian and phenomenological implications.
Creator
Piper, Wendy A., Florida Atlantic University, Pearce, Howard D.
Abstract/Description
Flannery O'Connor's Catholicism assumes a transcendent reality to be manifest in the physical world. In her view, as in the essentialist phenomenology of Edmund Husserl, we must penetrate the surface of reality in order to find the principles and generalities that underlie it. The incarnational nature of O'Connor's fiction reflects this vision. Her grotesque imagery and her use of elements of Aristotelian dramatic form manifest this sense of Mystery in her fiction. Character is revealed...
Show moreFlannery O'Connor's Catholicism assumes a transcendent reality to be manifest in the physical world. In her view, as in the essentialist phenomenology of Edmund Husserl, we must penetrate the surface of reality in order to find the principles and generalities that underlie it. The incarnational nature of O'Connor's fiction reflects this vision. Her grotesque imagery and her use of elements of Aristotelian dramatic form manifest this sense of Mystery in her fiction. Character is revealed through imagery and action. Finally, O'Connor's "reasonable use of the unreasonable" is based directly on Aristotelian "Surprise," which carries enough awe to jar the reader into an experience of the Mystery central to her vision.
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Date Issued
1991
PURL
http://purl.flvc.org/fcla/dt/14694
Subject Headings
O'Connor, Flannery--Criticism and interpretation
Format
Document (PDF)
First language attrition of Colombian Spanish speakers in south Florida
Title
First language attrition of Colombian Spanish speakers in south Florida.
Creator
Gonzalez, Gwynne., Florida Atlantic University, DuBravac, Stayc
Abstract/Description
This research study compares the use of the Spanish preterite and imperfect forms of stative verbs between native Spanish speakers in an L1 Spanish environment (E1) with L1 Spanish speakers in an L2 English environment (E2). The study specifically targets subjects' Spanish L1 attrition of these verb forms in an English L2 environment by eliciting their use in an informal interview.
Date Issued
2006
PURL
http://purl.flvc.org/fcla/dt/13378
Subject Headings
Language attrition--Florida., Linguistic minorities--Florida., Language obsolescence., Immigrants--Language--Florida.
Format
Document (PDF)
Fish community structure and organization in neotropical clear and blackwater streams in Guyana
Title
Fish community structure and organization in neotropical clear and blackwater streams in Guyana.
Creator
Bergquist, Teresa Cecilia., Florida Atlantic University, Bourne, Godfrey R., Courtenay, Walter R. Jr.
Abstract/Description
Small clear and blackwater streams of the neotropics are economically important because they may be nursery grounds for important food and aquarium fishes. At present, these ecosystems are being negatively impacted by current logging, and gold and diamond mining practices. Thus, the role of biotic and abiotic factors in fish community structure was examined in three unimpacted streams in Guyana, South America. These streams had relatively low fish species diversity, but complex feeding guild...
Show moreSmall clear and blackwater streams of the neotropics are economically important because they may be nursery grounds for important food and aquarium fishes. At present, these ecosystems are being negatively impacted by current logging, and gold and diamond mining practices. Thus, the role of biotic and abiotic factors in fish community structure was examined in three unimpacted streams in Guyana, South America. These streams had relatively low fish species diversity, but complex feeding guild structure. No significant correlations between abiotic factors and fish species diversity and feeding guild diversity were determined due to small sample size. However, principal component analysis suggested an association between pH and species diversity, and conductivity and guild diversity. Biotic factors, such as competition and predation may be the primary determinant of fish community structure and organization in neotropical blackwater streams.
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Date Issued
1994
PURL
http://purl.flvc.org/fcla/dt/15023
Subject Headings
Fishes--Guyana, Fishes--Tropics, Freshwater fishes--Guyana, Species diversity--Guyana
Format
Document (PDF)
Evaluation of shore protection measures applied to eroding beaches in Florida
Title
Evaluation of shore protection measures applied to eroding beaches in Florida.
Creator
Esteves, Luciana Slomp, Florida Atlantic University, Finkl, Charles W., Department of Geosciences, Charles E. Schmidt College of Science
Abstract/Description
Evaluations of shore erosion and protection in Florida are constrained by time and space. This study characterizes about 95% of Florida's beaches based on the degree of urban development, direction and rates of shoreline change, presence of sensitive ecological communities, and distribution of sea defense works. The 22 coastal-county maps prepared for this study show that approximately 195 km (16%) of Florida's beaches are eroding and 283 km (23%) are protected by engineering works. About 72%...
Show moreEvaluations of shore erosion and protection in Florida are constrained by time and space. This study characterizes about 95% of Florida's beaches based on the degree of urban development, direction and rates of shoreline change, presence of sensitive ecological communities, and distribution of sea defense works. The 22 coastal-county maps prepared for this study show that approximately 195 km (16%) of Florida's beaches are eroding and 283 km (23%) are protected by engineering works. About 72% of eroded beaches are geographically associated with inlets. Sand management at inlets is crucial to improve erosion mitigation in Florida. Suggestions designed to enhance mitigation of beach erosion are based on comparative analyses of potential environmental impacts, costs, and limitations of shore protection works. Alternative technologies that use combined techniques (i.e. bed fluidization/jet-pumps, beach nourishment/dewatering systems, or detached breakwaters) are more efficient, less expensive, and less environmentally hazardous than conventional methods.
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Date Issued
1997
PURL
http://purl.flvc.org/fcla/dt/15473
Subject Headings
Beach erosion--Florida, Coast changes--Florida, Shore protection--Florida, Coastal zone management--Florida
Format
Document (PDF)
Evaluating indirect and direct classification techniques for network intrusion detection
Title
Evaluating indirect and direct classification techniques for network intrusion detection.
Creator
Ibrahim, Nawal H., Florida Atlantic University, Khoshgoftaar, Taghi M.
Abstract/Description
Increasing aggressions through cyber terrorism pose a constant threat to information security in our day to day life. Implementing effective intrusion detection systems (IDSs) is an essential task due to the great dependence on networked computers for the operational control of various infrastructures. Building effective IDSs, unfortunately, has remained an elusive goal owing to the great technical challenges involved, and applied data mining techniques are increasingly being utilized in...
Show moreIncreasing aggressions through cyber terrorism pose a constant threat to information security in our day to day life. Implementing effective intrusion detection systems (IDSs) is an essential task due to the great dependence on networked computers for the operational control of various infrastructures. Building effective IDSs, unfortunately, has remained an elusive goal owing to the great technical challenges involved, and applied data mining techniques are increasingly being utilized in attempts to overcome the difficulties. This thesis presents a comparative study of the traditional "direct" approaches with the recently explored "indirect" approaches of classification which use class binarization and combiner techniques for intrusion detection. We evaluate and compare the performance of IDSs based on various data mining algorithms, in the context of a well known network intrusion evaluation data set. It is empirically shown that data mining algorithms when applied using the indirect classification approach yield better intrusion detection models.
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Date Issued
2004
PURL
http://purl.flvc.org/fcla/dt/13128
Subject Headings
Computer networks--Security measures, Computer security, Software measurement, Data mining
Format
Document (PDF)

Pages