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Title: Automation of the S.H.I.E.L.D. methodology for system hazard analysis and resilient design.
Creator: Marcus, Anthony M., Cardei, Ionut E., Alsenas, Gabriel, Graduate College
Date Issued: 2013-04-12
PURL: http://purl.flvc.org/fcla/dt/3361327
Subject Headings: System analysis, System design
Format: Document (PDF)

Title: PARAMETERIZATION OF INVARIANT CIRCLES IN MAPS.
Creator: Blessing, David Charles, James, J. D. James, Florida Atlantic University, Department of Mathematical Sciences, Charles E. Schmidt College of Science
Abstract/Description: We explore a novel method of approximating contractible invariant circles in maps. The process begins by leveraging improvements on Birkhoff's Ergodic Theorem via Weighted Birkhoff Averages to compute high precision estimates on several Fourier modes. We then set up a Newton-like iteration scheme to further improve the estimation and extend the approximation out to a sufficient number of modes to yield a significant decay in the magnitude of the coefficients of high order. With this...
Show moreWe explore a novel method of approximating contractible invariant circles in maps. The process begins by leveraging improvements on Birkhoff's Ergodic Theorem via Weighted Birkhoff Averages to compute high precision estimates on several Fourier modes. We then set up a Newton-like iteration scheme to further improve the estimation and extend the approximation out to a sufficient number of modes to yield a significant decay in the magnitude of the coefficients of high order. With this approximation in hand, we explore the phase space near the approximate invariant circle with a form numerical continuation where the rotation number is perturbed and the process is repeated. Then, we turn our attention to a completely different problem which can be approached in a similar way to the numerical continuation, finding a Siegel disk boundary in a holomorphic map. Given a holomorphic map which leads to a formally solvable cohomological equation near the origin, we use a numerical continuation style process to approximate an invariant circle in the Siegel disk near the origin. Using an iterative scheme, we then enlarge the invariant circle so that it approximates the boundary of the Siegel disk.
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Date Issued: 2024
PURL: http://purl.flvc.org/fau/fd/FA00014464
Subject Headings: Dynamical systems, Nonlinearity (Mathematics), Numerical analysis, Parameterization
Format: Document (PDF)

Title: Image retrieval using visual attention.
Creator: Mayron, Liam M., College of Engineering and Computer Science, Florida Atlantic University, Department of Computer and Electrical Engineering and Computer Science
Abstract/Description: The retrieval of digital images is hindered by the semantic gap. The semantic gap is the disparity between a user's high-level interpretation of an image and the information that can be extracted from an image's physical properties. Content based image retrieval systems are particularly vulnerable to the semantic gap due to their reliance on low-level visual features for describing image content. The semantic gap can be narrowed by including high-level, user-generated information. High-level...
Show moreThe retrieval of digital images is hindered by the semantic gap. The semantic gap is the disparity between a user's high-level interpretation of an image and the information that can be extracted from an image's physical properties. Content based image retrieval systems are particularly vulnerable to the semantic gap due to their reliance on low-level visual features for describing image content. The semantic gap can be narrowed by including high-level, user-generated information. High-level descriptions of images are more capable of capturing the semantic meaning of image content, but it is not always practical to collect this information. Thus, both content-based and human-generated information is considered in this work. A content-based method of retrieving images using a computational model of visual attention was proposed, implemented, and evaluated. This work is based on a study of contemporary research in the field of vision science, particularly computational models of bottom-up visual attention. The use of computational models of visual attention to detect salient by design regions of interest in images is investigated. The method is then refined to detect objects of interest in broad image databases that are not necessarily salient by design. An interface for image retrieval, organization, and annotation that is compatible with the attention-based retrieval method has also been implemented. It incorporates the ability to simultaneously execute querying by image content, keyword, and collaborative filtering. The user is central to the design and evaluation of the system. A game was developed to evaluate the entire system, which includes the user, the user interface, and retrieval methods.
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Date Issued: 2008
PURL: http://purl.flvc.org/fcla/flaent/EN00154040/68_1/98p0137i.pdf, http://purl.flvc.org/FAU/58006
Subject Headings: Image processing, Digital techniques, Database systems, Cluster analysis, Multimedia systems
Format: Document (PDF)

Title: RF-based location system for communicating and monitoring vehicles in a multivehicle network.
Creator: Cortes, Luis Fernando, Raviv, Daniel, Florida Atlantic University, College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
Abstract/Description: This document reports on a hands-on project aimed at learning and experiencing the concept of system-of-systems. The motivation behind this project is to study and implement the concept of System of Systems in the generation of a RF-based communication and control complex system. The goal of this project is to develop a multi-level integrated and complete system in which the vehicles that belong to a same network can become aware of their location, communicate with nearby vehicles (sometimes...
Show moreThis document reports on a hands-on project aimed at learning and experiencing the concept of system-of-systems. The motivation behind this project is to study and implement the concept of System of Systems in the generation of a RF-based communication and control complex system. The goal of this project is to develop a multi-level integrated and complete system in which the vehicles that belong to a same network can become aware of their location, communicate with nearby vehicles (sometimes with no visible line of sight), be notified of the presence of different objects located in their immediate vicinity (obstacles, such as abundant vehicles), and generate a two dimensional representation of the vehicles’ location for a remote user. In addition, this system will be able to transmit back messages from the remote user to a specific or to all local vehicles. The end result is a demonstration of a complex, functional, and robust system built and tested for other projects to use and learn from.
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Date Issued: 2015
PURL: http://purl.flvc.org/fau/fd/FA00004437, http://purl.flvc.org/fau/fd/FA00004437
Subject Headings: Radio frequency identification system, System analysis, System design, Systems engineering -- Technological innovations
Format: Document (PDF)

Title: Model reduction of large-scale systems using perturbed frequency-domain balanced structure.
Creator: Zadegan, Abbas Hassan., Florida Atlantic University, Zilouchian, Ali, College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
Abstract/Description: Model reduction of large-scale systems over a specified frequency range of operation is studied in this research and reported in this dissertation. Frequency-domain balanced structures with integration of singular perturbation are proposed for model reduction of large-scale continuous-time as well as discrete-time systems. This method is applied to both open-loop as well as closed-loop systems. It is shown that the response of reduced systems closely resemble that of full order systems within...
Show moreModel reduction of large-scale systems over a specified frequency range of operation is studied in this research and reported in this dissertation. Frequency-domain balanced structures with integration of singular perturbation are proposed for model reduction of large-scale continuous-time as well as discrete-time systems. This method is applied to both open-loop as well as closed-loop systems. It is shown that the response of reduced systems closely resemble that of full order systems within a specified frequency range of operation. Simulation experiments for the model reduction of several large-scale, continuous and discrete-time systems demonstrate the superiority of the proposed technique over the previously available methods.
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Date Issued: 2004
PURL: http://purl.flvc.org/fcla/dt/12114
Subject Headings: System analysis, Large scale systems--Mathematical models, System design, Control theory, Mathematical optimization
Format: Document (PDF)

Title: Fast underwater acoustic data link design via multicarrier modulation and higher-order statistics equalization.
Creator: Bessios, Anthony G., Caimi, F. M., Harbor Branch Oceanographic Institute
Date Issued: 1995
PURL: http://purl.flvc.org/FCLA/DT/3172993
Subject Headings: Wireless communication systems, Digital communications, Remote submersibles, Robotics, Stochastic analysis
Format: Document (PDF)

Title: Simulations and feedback control of nonlinear coupled electromechanical oscillators for energy conversion applications.
Creator: Psarrou, Dimitrios., Dhanak, Manhar R., College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
Abstract/Description: This thesis discusses the coupling of a mechanical and electrical oscillator, an arrangement that is often encountered in mechatronics actuators and sensors. The dynamics of this coupled system is mathematically modeled and a low pass equivalent model is presented. Numerical simulations are then performed, for various input signals to characterize the nonlinear relationship between the electrical current and the displacement of the mass. Lastly a framework is proposed to estimate the mass...
Show moreThis thesis discusses the coupling of a mechanical and electrical oscillator, an arrangement that is often encountered in mechatronics actuators and sensors. The dynamics of this coupled system is mathematically modeled and a low pass equivalent model is presented. Numerical simulations are then performed, for various input signals to characterize the nonlinear relationship between the electrical current and the displacement of the mass. Lastly a framework is proposed to estimate the mass position without the use of a position sensor, enabling the sensorless control of the coupled system and additionally providing the ability for the system to act as an actuator or a sensor. This is of value for health monitoring, diagnostics and prognostics, actuation and power transfer of a number of interconnected machines that have more than one electrical system, driving corresponding mechanical subsystems while being driven by the same voltage source and at the same time being spectrally separated and independent.
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Date Issued: 2011
PURL: http://purl.flvc.org/FAU/3320109
Subject Headings: Renewable energy sources, Mechatronics, Nonlinear theories, Oscillators, System analysis
Format: Document (PDF)

Title: Contextual Modulation of Competitive Object Candidates in Early Object Recognition.
Creator: Islam, Mohammed F., Barenholtz, Elan, Florida Atlantic University, Charles E. Schmidt College of Science, Department of Psychology
Abstract/Description: Object recognition is imperfect; often incomplete processing or deprived information yield misperceptions (i.e., misidentification) of objects. While quickly rectified and typically benign, instances of such errors can produce dangerous consequences (e.g., police shootings). Through a series of experiments, this study examined the competitive process of multiple object interpretations (candidates) during the earlier stages of object recognition process using a lexical decision task paradigm....
Show moreObject recognition is imperfect; often incomplete processing or deprived information yield misperceptions (i.e., misidentification) of objects. While quickly rectified and typically benign, instances of such errors can produce dangerous consequences (e.g., police shootings). Through a series of experiments, this study examined the competitive process of multiple object interpretations (candidates) during the earlier stages of object recognition process using a lexical decision task paradigm. Participants encountered low-pass filtered objects that were previously demonstrated to evoke multiple responses: a highly frequented interpretation (“primary candidates”) and a lesser frequented interpretation (“secondary candidates”). When objects were presented without context, no facilitative effects were observed for primary candidates. However, secondary candidates demonstrated evidence for being actively suppressed.
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Date Issued: 2017
PURL: http://purl.flvc.org/fau/fd/FA00004836, http://purl.flvc.org/fau/fd/FA00004836
Subject Headings: Pattern recognition systems., Information visualization., Artificial intelligence., Spatial analysis (Statistics), Latent structure analysis.
Format: Document (PDF)

Title: Frequency Line Tracking in Spectrograms Using Hidden Markov Models.
Creator: Gunes, Tuncay, Erdol, Nurgun, Florida Atlantic University
Abstract/Description: One of the limiting factors restricting aircraft landings at maJor airports is the minimum spacing requirements due to vortex wake avoidance. If it can be shown that the separation requirements are too conservative, then it may be possible to increase the rate of landings on a given runway. During August/September 2003, NASA and the (United States Department of Transportation) USDOT sponsored a wake acoustics test at the Denver International Airport. The central instrument of the test was a...
Show moreOne of the limiting factors restricting aircraft landings at maJor airports is the minimum spacing requirements due to vortex wake avoidance. If it can be shown that the separation requirements are too conservative, then it may be possible to increase the rate of landings on a given runway. During August/September 2003, NASA and the (United States Department of Transportation) USDOT sponsored a wake acoustics test at the Denver International Airport. The central instrument of the test was a large microphone phased array. Different types of aircrafts were recorded during landing and the acoustic data obtained was stored. From acoustic data the spectrograms were generated using the technique of AutoRegressive (AR) spectral estimation from multitaper autocorrelation estimates. Several sources of sound that are recorded in the audio files can be observed in the spectrograms. Some these signals, such as the noise generated from the aircraft engine can be identified easily because of their strength and the Doppler shift they undergo. In contrast to this, the wake vortex signal is weaker and does not exhibit a Doppler shift because it's stationary in space. Therefore it may not be identified easily because of the existence of stronger signals. The motive in our research is to develop methods to determine these strong signals that appear as spectral lines in the spectrogram. In the future, the results obtained in this work can be used to eliminate these strong signals from the spectrogram thus allowing us to see and identify wake vortex signal which is more important to us.
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Date Issued: 2006
PURL: http://purl.flvc.org/fau/fd/FA00012525
Subject Headings: Markov processes, Economics--Mathematical models, Wave structure function--Analysis, Adaptive control systems, Spectrum analysis
Format: Document (PDF)

Title: GIS and spatial data analysis: A case study using MODFLOW and ARC/INFO.
Creator: Hinton, Matthew Alfred., Florida Atlantic University, Shaw, Shih-Lung, Charles E. Schmidt College of Science, Department of Geosciences
Abstract/Description: GIS is expected to differ from other digital spatial data handling packages by virtue of its emphasis on spatial analysis and modeling, yet major limitations of spatial analytical capabilities are still observed. To identify the types of spatial analysis which are desirable and appropriate to GIS, this thesis proposes a systematic 'building-blocks' approach for the identification of data models and spatial analytical tools to develop a flexible and powerful GIS spatial analysis and modeling...
Show moreGIS is expected to differ from other digital spatial data handling packages by virtue of its emphasis on spatial analysis and modeling, yet major limitations of spatial analytical capabilities are still observed. To identify the types of spatial analysis which are desirable and appropriate to GIS, this thesis proposes a systematic 'building-blocks' approach for the identification of data models and spatial analytical tools to develop a flexible and powerful GIS spatial analysis and modeling environment. The building-blocks approach will be demonstrated in this thesis by examining a ground water flow model in MODFLOW, an SDA package designed specifically for this purpose. Procedures in MODFLOW will be disassembled into their primitive component functions, or building-blocks, which will then be sought out in ARC/INFO, representing a modern, general-purpose GIS. In the process, the levels of integration between GIS and SDA will be encountered and discussed.
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Date Issued: 1994
PURL: http://purl.flvc.org/fcla/dt/15007
Subject Headings: Geographic information systems, Spatial analysis (Statistics)--Data processing, Information storage and retrieval systems--Geography
Format: Document (PDF)

Title: Statistics preserving spatial interpolation methods for missing precipitation data.
Creator: El Sharif, Husayn., College of Engineering and Computer Science, Department of Civil, Environmental and Geomatics Engineering
Abstract/Description: Deterministic and stochastic weighting methods are commonly used methods for estimating missing precipitation rain gauge data based on values recorded at neighboring gauges. However, these spatial interpolation methods seldom check for their ability to preserve site and regional statistics. Such statistics and primarily defined by spatial correlations and other site-to-site statistics in a region. Preservation of site and regional statistics represents a means of assessing the validity of...
Show moreDeterministic and stochastic weighting methods are commonly used methods for estimating missing precipitation rain gauge data based on values recorded at neighboring gauges. However, these spatial interpolation methods seldom check for their ability to preserve site and regional statistics. Such statistics and primarily defined by spatial correlations and other site-to-site statistics in a region. Preservation of site and regional statistics represents a means of assessing the validity of missing precipitation estimates at a site. This study evaluates the efficacy of traditional interpolation methods for estimation of missing data in preserving site and regional statistics. New optimal spatial interpolation methods intended to preserve these statistics are also proposed and evaluated in this study. Rain gauge sites in the state of Kentucky are used as a case study, and several error and performance measures are used to evaluate the trade-offs in accuracy of estimation and preservation of site and regional statistics.
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Date Issued: 2012
PURL: http://purl.flvc.org/FAU/3355568
Subject Headings: Numerical analysis, Meteorology, Statistical methods, Spatial analysis (Statistics), Data processing, Atmospheric physics, Statistical methods, Geographic information systems, Mathematical models
Format: Document (PDF)

Title: An intelligent approach to system identification.
Creator: Saravanan, Natarajan, Florida Atlantic University, Duyar, Ahmet, College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
Abstract/Description: System identification methods are frequently used to obtain appropriate models for the purpose of control, fault detection, pattern recognition, prediction, adaptive filtering and other purposes. A number of techniques exist for the identification of linear systems. However, real-world and complex systems are often nonlinear and there exists no generic methodology for the identification of nonlinear systems with unknown structure. A recent approach makes use of highly interconnected networks...
Show moreSystem identification methods are frequently used to obtain appropriate models for the purpose of control, fault detection, pattern recognition, prediction, adaptive filtering and other purposes. A number of techniques exist for the identification of linear systems. However, real-world and complex systems are often nonlinear and there exists no generic methodology for the identification of nonlinear systems with unknown structure. A recent approach makes use of highly interconnected networks of simple processing elements, which can be programmed to approximate nonlinear functions to identify nonlinear dynamic systems. This thesis takes a detailed look at identification of nonlinear systems with neural networks. Important questions in the application of neural networks for nonlinear systems are identified; concerning the excitation properties of input signals, selection of an appropriate neural network structure, estimation of the neural network weights, and the validation of the identified model. These questions are subsequently answered. This investigation leads to a systematic procedure for identification using neural networks and this procedure is clearly illustrated by modeling a complex nonlinear system; the components of the space shuttle main engine. Additionally, the neural network weights are determined by using a general purpose optimization technique known as evolutionary programming which is based on the concept of simulated evolution. The evolutionary programming algorithm is modified to include self-adapting step sizes. The effectiveness of the evolutionary programming algorithm as a general purpose optimization algorithm is illustrated on a test suite of problems including function optimization, neural network weight optimization, optimal control system synthesis and reinforcement learning control.
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Date Issued: 1994
PURL: http://purl.flvc.org/fcla/dt/12371
Subject Headings: Neural networks (Computer science), System identification, Nonlinear theories, System analysis, Space shuttles--Electronic equipment, Algorithms--Computer programs
Format: Document (PDF)

Title: Developments in laser-line scanned undersea surface mapping and image analysis systems for scientific applications.
Creator: Caimi, F. M., Kocak, D. M., Asper, V. L., Harbor Branch Oceanographic Institute
Date Issued: 1996
PURL: http://purl.flvc.org/FCLA/DT/3183695
Subject Headings: Underwater imaging systems, Image analysis, Topographical surveying--Laser use in
Format: Document (PDF)

Title: Beyond sustainability: justice and complex systems thinking for just sustainable viability.
Creator: Best, Andrea Leigh., Dorothy F. Schmidt College of Arts and Letters, Department of Philosophy
Abstract/Description: The dominant definitions of sustainability are too various and neglect essential elements necessary for effective sustainability discourse. This project considers what current understandings of sustainable development mean to those who subscribe to them and how those understandings affect public policy for sustainable development. I begin by presenting a timeline on the evolution of the term 'sustainability'. Then, I offer narrative policy analysis as a methodological tool for investigating...
Show moreThe dominant definitions of sustainability are too various and neglect essential elements necessary for effective sustainability discourse. This project considers what current understandings of sustainable development mean to those who subscribe to them and how those understandings affect public policy for sustainable development. I begin by presenting a timeline on the evolution of the term 'sustainability'. Then, I offer narrative policy analysis as a methodological tool for investigating communities of meaning with contending views on sustainability. This provides a foundation for the analysis of case studies using Harrisonian Sustainability Narratives-efficiency, equity, and ethics-as lenses through which three corresponding U.S. case studies are explored, each representing different levels of analysis-corporate, state, and individual. First, the Business Roundtable, a lobbying organization comprised of the CEOs of top U.S. companies exemplifying the efficiency narrative, claims that the problem of sustainable development can be addressed through free markets, which continually increase eco-efficiency and encourage technological advancement. Next, the Environmental Protection Agency, a state organization mandated to protect water and air and to manage toxic and solid wastes and representing the equity narrative, sees the problem of sustainable development as ensuring the just distribution of natural limits so as to reduce the impact of those limits on individuals within communities. Lastly, the ethical anthropology of Anna Peterson, philosopher of religion, points to the power of ethical narratives in creating wide-scale changes to our ideas about humanness and human nature as they relate to our relationship with our environment for sustainability., What I found in common with both the efficiency and equity narratives, representing both the political and corporate perspective and having significant influence on policy formation, is that they are pro market-based solutions of ecoefficiency and technological advancement. What they blatantly lack is guidance on what we ought to do, ought to value. I conclude that a humanist ethic is missing from both these narratives. Neither narrative sees matters of justice as co-equal partners with sustainability for sustainable development. Policy resulting from these narratives may offer efficiency and process but fails to include a robust humanist ethics necessary for a true sustainability. The way we think about our relationship to the environment shapes our behavior towards it. Just Sustainable Viability combines a complex systems approach that views human societies as complex adaptive systems and aims at optimizing social adaptive capacity with notions of distributive and procedural justice. With the inception of this new vision for sustainability, a new narrative must follow that firmly places humanity within the context of complex social and environmental systems.
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Date Issued: 2010
PURL: http://purl.flvc.org/FAU/2684310
Subject Headings: System analysis, Policy sciences, Sustainable development, Social structure, Urban ecology (Sociology)
Format: Document (PDF)

Title: Evaluation of motion compensated ADV measurements for quantifying velocity fluctuations.
Creator: Lovenbury, James William., College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
Abstract/Description: This study assesses the viability of using a towfish mounted ADV for quantifying water velocity fluctuations in the Florida Current relevant to ocean current turbine performance. For this study a motion compensated ADV is operated in a test flume. Water velocity fluctuations are generated by a 1.3 cm pipe suspended in front of the ADV at relative current speeds of 0.9 m/s and 0.15 m/s, giving Reynolds numbers on the order of 1000. ADV pitching motion of +/- 2.5 [degree] at 0.3 Hz and a heave...
Show moreThis study assesses the viability of using a towfish mounted ADV for quantifying water velocity fluctuations in the Florida Current relevant to ocean current turbine performance. For this study a motion compensated ADV is operated in a test flume. Water velocity fluctuations are generated by a 1.3 cm pipe suspended in front of the ADV at relative current speeds of 0.9 m/s and 0.15 m/s, giving Reynolds numbers on the order of 1000. ADV pitching motion of +/- 2.5 [degree] at 0.3 Hz and a heave motion of 0.3 m amplitude at 0.2 Hz are utilized to evaluate the motion compensation approach. The results show correction for motion provides up to an order of magnitude reduction in turbulent kinetic energy at frequencies of motion while the IMU is found to generate 2% error at 1/30 Hz and 9% error at 1/60 Hz in turbulence intensity.
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Date Issued: 2013
PURL: http://purl.flvc.org/fcla/dt/3362482
Subject Headings: Motion control systems, Fluid dynamic measurements, Fluid mechanics, Mathematical models, Analysis of covariance
Format: Document (PDF)

Title: How the Spatial Organization of Objects Affects Perceptual Processing of a Scene.
Creator: Rashford, Stacey, Barenholtz, Elan, Florida Atlantic University, Charles E. Schmidt College of Science, Department of Psychology
Abstract/Description: How does spatial organization of objects affect the perceptual processing of a scene? Surprisingly, little research has explored this topic. A few studies have reported that, when simple, homogenous stimuli (e.g., dots), are presented in a regular formation, they are judged to be more numerous than when presented in a random configuration (Ginsburg, 1976; 1978). However, these results may not apply to real-world objects. In the current study, fewer objects were believed to be on organized...
Show moreHow does spatial organization of objects affect the perceptual processing of a scene? Surprisingly, little research has explored this topic. A few studies have reported that, when simple, homogenous stimuli (e.g., dots), are presented in a regular formation, they are judged to be more numerous than when presented in a random configuration (Ginsburg, 1976; 1978). However, these results may not apply to real-world objects. In the current study, fewer objects were believed to be on organized desks than their disorganized equivalents. Objects that are organized may be more likely to become integrated, due to classic Gestalt principles. Consequently, visual search may be more difficult. Such object integration may diminish saliency, making objects less apparent and more difficult to find. This could explain why, in the present study, objects on disorganized desks were found faster.
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Date Issued: 2015
PURL: http://purl.flvc.org/fau/fd/FA00004537, http://purl.flvc.org/fau/fd/FA00004537
Subject Headings: Image analysis, Optical pattern recognition, Pattern recognition systems, Phenomenological psychology, Visual perception
Format: Document (PDF)

Title: A systematic evaluation of object detection and recognition approaches with context capabilities.
Creator: Giusti Urbina, Rafael J., College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
Abstract/Description: Contemporary computer vision solutions to the problem of object detection aim at incorporating contextual information into the process. This thesis proposes a systematic evaluation of the usefulness of incorporating knowledge about the geometric context of a scene into a baseline object detection algorithm based on local features. This research extends publicly available MATLABRª implementations of leading algorithms in the field and integrates them in a coherent and extensible way....
Show moreContemporary computer vision solutions to the problem of object detection aim at incorporating contextual information into the process. This thesis proposes a systematic evaluation of the usefulness of incorporating knowledge about the geometric context of a scene into a baseline object detection algorithm based on local features. This research extends publicly available MATLABRª implementations of leading algorithms in the field and integrates them in a coherent and extensible way. Experiments are presented to compare the performance and accuracy between baseline and context-based detectors, using images from the recently published SUN09 dataset. Experimental results demonstrate that adding contextual information about the geometry of the scene improves the detector performance over the baseline case in 50% of the tested cases.
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Date Issued: 2011
PURL: http://purl.flvc.org/FAU/3183127
Subject Headings: Imaging systems, Mathematical models, Cognitive science, Optical pattern recognition, Computer vision, Logistic regression analysis
Format: Document (PDF)

Title: Hybrid model for optimization of cost operations for a university transit service.
Creator: Portal Palomo, Alicia Benazir., College of Engineering and Computer Science, Department of Civil, Environmental and Geomatics Engineering
Abstract/Description: The demand on transportation infrastructure is dramatically increasing due to population growth causing the transportation systems to be pushed to their limits. With the projected population growth, not only for the U.S. but especially for the higher education field, university campuses are of great importance for transportation engineers. Urban univeristy campuses are considered major trip generators and with the population forecast many challenges are bound to arise. The implementation of...
Show moreThe demand on transportation infrastructure is dramatically increasing due to population growth causing the transportation systems to be pushed to their limits. With the projected population growth, not only for the U.S. but especially for the higher education field, university campuses are of great importance for transportation engineers. Urban univeristy campuses are considered major trip generators and with the population forecast many challenges are bound to arise. The implementation of an improved transit system provides a lower-cost solution to the continuously increasing congestion problems in university campus road networks and surrounding areas. This paper presents a methodology focused on the development of a hybrid system concentrated in three main aspects of transit functionality : access to bus stop location, reasonable travel time and low cost. Two methods for bus stop locations assessment are presented for two levels of analysis : microscopic and mesoscopic. The resulting travel time from the improved bus stop locations is analyzed and compared to the initial conditions by using a microsimulation platform. The development of a mathematical model targets the overall system's cost minimization, including user and operator cost, while maximizing the service coverage. The results demonstrate the benefits of the bus stop assessment by the two applied methods, as well as, the benefits of the route and headway selection based on the mathematical model. Moreover, the results indicate that the generation of routes using travel time as the impedance factor generates the optimal possible routes to obtain the minimum system's overall cost.
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Date Issued: 2012
PURL: http://purl.flvc.org/FAU/3352277
Subject Headings: Local transit, Statistics, Transportation planning, Mathematical models, System analysis, Statistical methods, Transportation, Data processing
Format: Document (PDF)

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)

Title: The cave as a cosmogram: The use of GIS in an intrasite spatial analysis of the main chamber of Actun Tunichil Muknal, a Maya ceremonial cave in Western Belize.
Creator: Moyes, Holley., Florida Atlantic University, Fradkin, Arlene
Abstract/Description: This study is a spatial analysis conducted in the Main Chamber of Actun Tunichil Muknal, a Terminal Classic Maya ceremonial cave (A.D. 830--950), located in Western Belize. The research examines ancient Maya ritual cave use by analyzing artifact deposition patterns. Using a Geographical Information System (GIS), it provides a methodology for the development of comparative models of spatial organization. The system facilitated data visualization, exploration, and generation. The GIS was...
Show moreThis study is a spatial analysis conducted in the Main Chamber of Actun Tunichil Muknal, a Terminal Classic Maya ceremonial cave (A.D. 830--950), located in Western Belize. The research examines ancient Maya ritual cave use by analyzing artifact deposition patterns. Using a Geographical Information System (GIS), it provides a methodology for the development of comparative models of spatial organization. The system facilitated data visualization, exploration, and generation. The GIS was instrumental in the analysis of the proximity of artifacts to natural morphological features of the cave. Artifact deposition patterns were correlated with known ritual behavior patterns from the region. Using this method, boundary markers, artifact pathways, and a centrally located symbolic three-stone-hearth feature were identified. This study suggests that, within the cave, the ancient Maya employed a cognitive model of spatial organization similar to that witnessed by ethnographers in other venues, or reported in ethnohistorical texts in rites of foundation.
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Date Issued: 2001
PURL: http://purl.flvc.org/fcla/dt/12851
Subject Headings: Caves--Belize., Mayas--Balize--Antiquities., Spatial analysis (Statistics), Geographic information systems.
Format: Document (PDF)

FAU Theses and Dissertations (37)	+ -
HBOI Faculty Contributions (2)	+ -
FAU Graduate Student Research (1)	+ -

Spatial analysis (Statistics) (8)	+ -
System analysis (7)	+ -
Geographic information systems (5)	+ -
Mathematical models (4)	+ -
Geographic information systems. (3)	+ -

Image analysis (3)	+ -
Nonlinear theories (3)	+ -
Pattern recognition systems. (3)	+ -
System design (3)	+ -
Data processing (2)	+ -
Differentiable dynamical systems (2)	+ -
Information visualization. (2)	+ -
Latent structure analysis. (2)	+ -
Mathematical optimization (2)	+ -
Neural networks (Computer science) (2)	+ -
Numerical analysis (2)	+ -
Optical pattern recognition (2)	+ -
Pattern recognition systems (2)	+ -
Spatial analysis (Statistics)--Data processing (2)	+ -
Statistical methods (2)	+ -
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