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Title: Time-domain finite-difference analysis of electromagnetic scattering and penetration problems.
Creator: Bemmel, Vincent Egbert., Florida Atlantic University, Sadiku, Matthew
Abstract/Description: The complexity involved in using analytical techniques in solving electromagnetic problems can be avoided by simulating Maxwell's differential equations by finite difference equations, which are easily solved by iteration. In this work some algorithms were developed in order to investigate plane waves as they travel through a certain medium and interact with objects, resulting in scattering and/or penetration. The numerical results were found to be in good agreement with analytical results...
Show moreThe complexity involved in using analytical techniques in solving electromagnetic problems can be avoided by simulating Maxwell's differential equations by finite difference equations, which are easily solved by iteration. In this work some algorithms were developed in order to investigate plane waves as they travel through a certain medium and interact with objects, resulting in scattering and/or penetration. The numerical results were found to be in good agreement with analytical results for tractable cases.
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Date Issued: 1987
PURL: http://purl.flvc.org/fcla/dt/14422
Subject Headings: Electromagnetic fields, Maxwell's equations
Format: Document (PDF)

Title: Time-dependent multipath modeling for underwater acoustic wave propagation in shallow water.
Creator: Boulanger, Florent Jacques., Florida Atlantic University, Beaujean, Pierre-Philippe
Abstract/Description: A novel acoustic wave propagation model has been developed to determine the effects of the ocean variations on the acoustic propagation field, and to determine the signal measured by a receiver at any distance from an omnidirectional source. The model accounts for environmental conditions. First, a stationary estimate of the complex sound attenuation is computed as a function of frequency and location, using the parabolic equation numerical technique. For a given range, the vertical profile...
Show moreA novel acoustic wave propagation model has been developed to determine the effects of the ocean variations on the acoustic propagation field, and to determine the signal measured by a receiver at any distance from an omnidirectional source. The model accounts for environmental conditions. First, a stationary estimate of the complex sound attenuation is computed as a function of frequency and location, using the parabolic equation numerical technique. For a given range, the vertical profile of the attenuation frequency spectrum is decomposed in the wave number domain. A specific Doppler shift is associated with each wave number. The space-frequency attenuation filter obtained is applied to the transmitted signal to create time-frequency selective fading. This model has been used to simulate the performance of the General Purpose Acoustic Modem, which transmits MFSK modulated sequences between 15.6 kHz to 32.1 kHz. The range of operation varies from 1 to 5 km, in 15 meters of water. Experimental data have been collected under sea-state 2 conditions. The model has been successfully validated when compared to experimental data and to the Crepeau model.
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Date Issued: 2003
PURL: http://purl.flvc.org/fcla/dt/12978
Subject Headings: Underwater acoustics--Mathematical models, Sound--Transmission, Ocean waves--Mathematical models
Format: Document (PDF)

Title: Time-dependent behavior of reinforced concrete members with carbon fiber reinforced plastics (CFRP) under sustained loads.
Creator: Chidambaram, Senthilkumar., Florida Atlantic University, Arockiasamy, Madasamy
Abstract/Description: Carbon Fiber Reinforced Plastics has recently has been recognized as an alternative to conventional steel reinforcement in concrete due to its excellent resistance to corrosion. Four rectangular concrete beams and four concrete columns reinforced with CFRP bars were cast for the study of the long term behavior under uniform sustained loading. The beams were simply supported and subjected to uniform sustained loading. The columns were arranged in a steel reaction framework. The beams and...
Show moreCarbon Fiber Reinforced Plastics has recently has been recognized as an alternative to conventional steel reinforcement in concrete due to its excellent resistance to corrosion. Four rectangular concrete beams and four concrete columns reinforced with CFRP bars were cast for the study of the long term behavior under uniform sustained loading. The beams were simply supported and subjected to uniform sustained loading. The columns were arranged in a steel reaction framework. The beams and columns were instrumented and monitored to observe the change in the behavior due to the creep and shrinkage of concrete. An analytical method is developed to predict the long term behavior of CFRP reinforced concrete members. The calculated deformations compare reasonably with the experimental values. A modified equation for the calculation of the long term deflection is proposed for CFRP reinforced concrete beams. A simplified equation for the calculation of the creep coefficient is also proposed.
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Date Issued: 1997
PURL: http://purl.flvc.org/fcla/dt/15424
Subject Headings: Fiber reinforced plastics, Columns, Concrete, Concrete beams
Format: Document (PDF)

Title: Tire noise resulting from open grid bridge decks.
Creator: Gregory, Scott Andrew., Florida Atlantic University, Cuschieri, Joseph M.
Abstract/Description: When a vehicle crosses the grid section of an open grid bridge deck, a tonal noise is generated. The tonal character of the noise is a consequence of the periodic excitation of both the tire and the grid. The excitation comes from the interaction between the vehicle tire and the periodic grid members. In this thesis, the parameters that control the level and frequency of the generated noise are investigated, with emphasis on quantifying the contribution to the overall noise level of the noise...
Show moreWhen a vehicle crosses the grid section of an open grid bridge deck, a tonal noise is generated. The tonal character of the noise is a consequence of the periodic excitation of both the tire and the grid. The excitation comes from the interaction between the vehicle tire and the periodic grid members. In this thesis, the parameters that control the level and frequency of the generated noise are investigated, with emphasis on quantifying the contribution to the overall noise level of the noise from the tire. The work in this thesis includes both laboratory and field measurements as well as theoretical analysis based on a ring model of the tire. By determining radiated acoustic power from the tires relative to the input force, the sound pressure level radiated from the tires when they cross the open grid deck is estimated. The results of this study show that the tire is the dominant source of noise on open grid bridges and in order to reduce the overall radiated noise, the excitation of the tires by the grid must be reduced. This can be accomplished by either infilling the grid deck or designing the grid to reduce the severity of the periodic excitation force.
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Date Issued: 1994
PURL: http://purl.flvc.org/fcla/dt/15054
Subject Headings: Bridges, Iron and steel--Floors, Bridges, Steel plate deck, Bridges--Noise, Tires--Noise
Format: Document (PDF)

Title: Thermal modeling and field temperature measurement of segmental box girder bridges in Florida.
Creator: Basole, Milind Madhukar., Florida Atlantic University, Reddy, Dronnadula V.
Abstract/Description: Temperature and thermal stress variations in a segmental box girder bridge arc studied. A finite element model using the general finite element software MARC is used to predict temperature and thermal stress variation, for segmental box girder bridges. The predictions are compared with actual measured temperature data of two segmental box girder bridges, instrumented with thermocouples and vibrating wire strain gages, in Davie, Florida. Continuous monitoring was carried out for two months in...
Show moreTemperature and thermal stress variations in a segmental box girder bridge arc studied. A finite element model using the general finite element software MARC is used to predict temperature and thermal stress variation, for segmental box girder bridges. The predictions are compared with actual measured temperature data of two segmental box girder bridges, instrumented with thermocouples and vibrating wire strain gages, in Davie, Florida. Continuous monitoring was carried out for two months in July-August, 1991, and for one month in January-February, 1992. Comparison are also made with the NCHRP suggested profiles. A Monte Carlo analysis is performed to accommodate the probabilistic variation of ambient temperature conditions.
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Date Issued: 1992
PURL: http://purl.flvc.org/fcla/dt/14840
Subject Headings: Bridges, Box girder, Bridges--Florida, Thermal stresses
Format: Document (PDF)

Title: Transmission of vibrational power in joined structures.
Creator: Gibert, Thierry M., Florida Atlantic University, Cuschieri, Joseph M.
Abstract/Description: The objective of this thesis is the investigation of the transmission of vibrational power between beam-like and plate-like structures with joints using Statistical Energy Analysis (SEA) and an experimental approach. In the case of the L-shaped plate the influence of different structure parameters is investigated to determine possible ways to reduce both the transmitted power and the noise radiated by the receiver structure. The total transmitted power is measured and compared to theoretical...
Show moreThe objective of this thesis is the investigation of the transmission of vibrational power between beam-like and plate-like structures with joints using Statistical Energy Analysis (SEA) and an experimental approach. In the case of the L-shaped plate the influence of different structure parameters is investigated to determine possible ways to reduce both the transmitted power and the noise radiated by the receiver structure. The total transmitted power is measured and compared to theoretical predictions. Also power maps are generated which show the transmission of vibrational power from the source beam to the receiver beam. In the power flow measurements three different techniques are implemented with similar results which all match the analytical results.
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Date Issued: 1988
PURL: http://purl.flvc.org/fcla/dt/14436
Subject Headings: Vibration, Power transmission
Format: Document (PDF)

Title: Simulation analysis of cluster-based multiprocessor systems.
Creator: De Armas, Mario Ernesto., Florida Atlantic University, Mahgoub, Imad
Abstract/Description: Multiprocessor systems have demonstrated great potential for meeting the ever increasing demand for higher performance. In this thesis, we develop simulation models with fewer and more realistic assumptions to evaluate the performance of the circuit-switched cluster-based multiprocessor system. We then introduce a packet-switched variation of the cluster-based architecture and develop simulation models to evaluate its performance. The analysis of the cluster-based systems is performed for...
Show moreMultiprocessor systems have demonstrated great potential for meeting the ever increasing demand for higher performance. In this thesis, we develop simulation models with fewer and more realistic assumptions to evaluate the performance of the circuit-switched cluster-based multiprocessor system. We then introduce a packet-switched variation of the cluster-based architecture and develop simulation models to evaluate its performance. The analysis of the cluster-based systems is performed for both uniform and non-uniform memory reference models. We conducted similar analysis for the crossbar and multiple-bus systems. Finally, the results of the cluster-based systems are compared to those obtained for the crossbar and the multiple-bus systems.
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Date Issued: 1993
PURL: http://purl.flvc.org/fcla/dt/14969
Subject Headings: Multiprocessors, Cluster analysis, Packet switching (Data transmission), Computer architecture, Computer simulation
Format: Document (PDF)

Title: Simulation analysis of the IBM Subsystem Control Block architecture in a network file server environment.
Creator: Anumulapally, Ranga R., Florida Atlantic University, Khoshgoftaar, Taghi M.
Abstract/Description: Advanced system bus architectures such as the Micro Channel and the EISA bus support what is called bus-mastering that allows the I/O subsystems attached to the bus to arbitrate and take control of the bus to perform data transfers independent of the system processor. I/O subsystems that can control/master the system bus are called Bus-Masters. The IBM Subsystem Control Block (SCB) architecture defines interrupt-driven as well as peer-to-peer I/O protocols for performing data transfers to...
Show moreAdvanced system bus architectures such as the Micro Channel and the EISA bus support what is called bus-mastering that allows the I/O subsystems attached to the bus to arbitrate and take control of the bus to perform data transfers independent of the system processor. I/O subsystems that can control/master the system bus are called Bus-Masters. The IBM Subsystem Control Block (SCB) architecture defines interrupt-driven as well as peer-to-peer I/O protocols for performing data transfers to/from the bus-masters. In previous studies, the performance of the SCB protocols is evaluated in network server environments using simulation models. The main drawback of these studies is that the server system is modeled in considerable detail but the network and the clients are not considered. In this study, we developed models to simulate a complete network file server environment where a single file server based on the SCB architecture provides file service to a variable number of clients on a token-ring network. We then evaluate the performance of the SCB protocols using the results obtained from the simulations.
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Date Issued: 1994
PURL: http://purl.flvc.org/fcla/dt/15057
Subject Headings: Distance education, Virtual reality
Format: Document (PDF)

Title: Silicone (RTV) sealant bonded aluminum joints: An experimental study.
Creator: Antony, Melvin., Florida Atlantic University, Hartt, William H.
Abstract/Description: The performance of adhesively bonded joints in terms of strength, sealing capacity and environmental resistance is of concern to designers in many fields including the marine industry. In the present work floating roller peel tests were utilized to study the bond properties of aluminum-silicone (RTV) joints. An attempt was made to identify the factors that affect the joint strength. Experiments revealed that peel strength increased with sealant thickness and decreased at high peel rates....
Show moreThe performance of adhesively bonded joints in terms of strength, sealing capacity and environmental resistance is of concern to designers in many fields including the marine industry. In the present work floating roller peel tests were utilized to study the bond properties of aluminum-silicone (RTV) joints. An attempt was made to identify the factors that affect the joint strength. Experiments revealed that peel strength increased with sealant thickness and decreased at high peel rates. Organo-silane primer SS4044 was found to improve the weatherability and strength of the joint. Results point out that mechanical interlocking combined with chemical alteration of the substrate surface was responsible for this improved adhesion. Combinations of three different environmental parameters were studied, and it was shown that seawater was the most hostile single type and a combined exposure to seawater and UV radiation (to simulate a marine environment) proved to be the worst overall. Tests showed that relaxation was governed by sealant thickness alone and was not affected by the marine environment.
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Date Issued: 1991
PURL: http://purl.flvc.org/fcla/dt/14711
Subject Headings: Aluminum--Bonding, Sealing compounds, Strength of materials
Format: Document (PDF)

Title: USING A SYNCHRONOUS SYSTEM ARCHITECTURE TO BUILD A LOW COST GRAPHICS TERMINAL.
Creator: DEAN, MARK EDWARD., Florida Atlantic University, Marcovitz, Alan B.
Abstract/Description: Computer generated graphics has become an integral part of most computer systems. Communicating information in an interesting and understandable manner has become a necessity in the computer industry due to the increase in users who are interested in animation, simulation, graphical design, games and graphic representations of complex mathematical information. The Synchronous System Architecture described in this paper will illustrate a simple, low cost and efficient means of creating and...
Show moreComputer generated graphics has become an integral part of most computer systems. Communicating information in an interesting and understandable manner has become a necessity in the computer industry due to the increase in users who are interested in animation, simulation, graphical design, games and graphic representations of complex mathematical information. The Synchronous System Architecture described in this paper will illustrate a simple, low cost and efficient means of creating and displaying images on a cathode ray tube (CRT). A step-by-step design procedure is presented which utilizes the Synchronous System Architecture (SSA) in a standalone system/terminal environment. Finally, the software alogrithms used in the system will be outlined and discussed.
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Date Issued: 1982
PURL: http://purl.flvc.org/fcla/dt/14100
Subject Headings: Computer graphics
Format: Document (PDF)

Title: USING A SUPERPROCESS TO ACCELERATE CONVERSATIONS FOR FAULT-TOLERANT CONCURRENT SOFTWARE.
Creator: GAO, LIXIN., Florida Atlantic University, Fernandez, Eduardo B.
Abstract/Description: Since computer systems are applied to many critical areas, fault-tolerance is a necessary requirement for their operation. Many techniques for dealing with hardware faults have been developed. Fault-tolerant software has had a much slower progress. Concurrent software adds an additional dimension to the problem of fault-tolerant software. This thesis uses an intermediate structure between two major schemes, conversation and programmer transparent coordination. The scheme proposed here...
Show moreSince computer systems are applied to many critical areas, fault-tolerance is a necessary requirement for their operation. Many techniques for dealing with hardware faults have been developed. Fault-tolerant software has had a much slower progress. Concurrent software adds an additional dimension to the problem of fault-tolerant software. This thesis uses an intermediate structure between two major schemes, conversation and programmer transparent coordination. The scheme proposed here accelerates conversations by using a special process or superprocess, which is executed on the same system level as the run-time system, and that by having access to the history of all interprocess communications can allow a process that passes its acceptance test to proceed conditionally. If the process does not pass its acceptance test all processes recover immediately without waiting to get to their acceptance tests. This work presents a set of algorithms to implement these ideas.
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Date Issued: 1987
PURL: http://purl.flvc.org/fcla/dt/14398
Subject Headings: Fault-tolerant computing
Format: Document (PDF)

Title: Using color image processing techniques to improve the performance of content-based image retrieval systems.
Creator: Costa, Fabio Morais., Florida Atlantic University, Furht, Borko
Abstract/Description: A Content-Based Image Retrieval (CBIR) system is a mechanism intended to retrieve a particular image from a large image repository without resorting to any additional information about the image. Query-by-example (QBE) is a technique used by CBIR systems where an image is retrieved from the database based on an example given by the user. The effectiveness of a CBIR system can be measured by two main indicators: how close the retrieved results are to the desired image and how fast we got those...
Show moreA Content-Based Image Retrieval (CBIR) system is a mechanism intended to retrieve a particular image from a large image repository without resorting to any additional information about the image. Query-by-example (QBE) is a technique used by CBIR systems where an image is retrieved from the database based on an example given by the user. The effectiveness of a CBIR system can be measured by two main indicators: how close the retrieved results are to the desired image and how fast we got those results. In this thesis, we implement some classical image processing operations in order to improve the average rank of the desired image, and we also implement two object recognition techniques to improve the subjective quality of the best ranked images. Results of experiments show that the proposed system outperforms an equivalent CBIR system in QBE mode, both from the point of view of precision as well as recall.
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Date Issued: 2001
PURL: http://purl.flvc.org/fcla/dt/12870
Subject Headings: Image processing--Digital techniques, Imaging systems--Image quality, Information storage and retrieval systems
Format: Document (PDF)

Title: Using a cerebellar model arithmetic computer (CMAC) neural network to control an autonomous underwater vehicle.
Creator: Comoglio, Rick F., Florida Atlantic University, Pandya, Abhijit S.
Abstract/Description: The design of an Autonomous Undersea Vehicle (AUV) control system is a significant challenge in-light of the highly uncertain nature of the ocean environment together with partially known nonlinear vehicle dynamics. This thesis describes a Neural Network architecture called Cerebellar Model Arithmetic Computer (CMAC). CMAC is used to control a model of an Autonomous Underwater Vehicle. The AUV model consists of two input parameters, the rudder and stern plane deflections, controlling six...
Show moreThe design of an Autonomous Undersea Vehicle (AUV) control system is a significant challenge in-light of the highly uncertain nature of the ocean environment together with partially known nonlinear vehicle dynamics. This thesis describes a Neural Network architecture called Cerebellar Model Arithmetic Computer (CMAC). CMAC is used to control a model of an Autonomous Underwater Vehicle. The AUV model consists of two input parameters, the rudder and stern plane deflections, controlling six output parameters; forward velocity, vertical velocity, pitch angle, side velocity, roll angle, and yaw angle. Properties of CMAC and results of computer simulations for identification and control of the AUV model are presented.
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Date Issued: 1991
PURL: http://purl.flvc.org/fcla/dt/14762
Subject Headings: Neural networks (Computer science), Artificial intelligence, Submersibles--Automatic control
Format: Document (PDF)

Title: THEORETICAL ANALYSIS OF HEAT EXCHANGERS IN AN OCEAN THERMAL ENERGY CONVERSION SYSTEM.
Creator: BENTON, DUDLEY JAMES., Florida Atlantic University, Tennant, Jeffrey S.
Abstract/Description: A theoretical study was conducted to determine the relationships between the major controlling factors in the heat exchangers in an Ocean Thermal Energy Conversion system. A digital computer model was developed to simulate and analyze the system. Variations in the thermophysical properties of the seawater and working fluid were considered in the analysis. Effects of variation in excess temperature differential on phase change heat transfer rates were also considered. The net power output of...
Show moreA theoretical study was conducted to determine the relationships between the major controlling factors in the heat exchangers in an Ocean Thermal Energy Conversion system. A digital computer model was developed to simulate and analyze the system. Variations in the thermophysical properties of the seawater and working fluid were considered in the analysis. Effects of variation in excess temperature differential on phase change heat transfer rates were also considered. The net power output of the system was determined from a Rankine cycle analysis. The results of this investigation show the necessity of a Rankine cycle analysis and the inclusion of fluid property variations. A significant difference can be seen in the net power output of such a system per dollar invested in the heat exchangers projected by this analysis and the analysis of other investigators which have not considered these factors.
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Date Issued: 1977
PURL: http://purl.flvc.org/fcla/dt/13875
Subject Headings: Heat exchangers--Fluid dynamics, Ocean thermal power plants
Format: Document (PDF)

Title: Utilizing "bills" for drag reduction below transition on spherical bodies.
Creator: Adamson, James Edward., Florida Atlantic University, Tennant, Jeffrey S.
Abstract/Description: Russian experimenters Kozlov and Leonenko have reported substantial drag reduction on a sphere using a "bill" or "spike" extending from the body upstream into the flow. A systematic series of experiments was conducted to determine the extent of the reduction and to identify the parameters of the reported drag reduction effect. The tests were performed in the Florida Atlantic University Ocean Engineering Department's Aerolab wind tunnel. A sphere was fitted with tapering bills of various...
Show moreRussian experimenters Kozlov and Leonenko have reported substantial drag reduction on a sphere using a "bill" or "spike" extending from the body upstream into the flow. A systematic series of experiments was conducted to determine the extent of the reduction and to identify the parameters of the reported drag reduction effect. The tests were performed in the Florida Atlantic University Ocean Engineering Department's Aerolab wind tunnel. A sphere was fitted with tapering bills of various lengths, base diameters, and bill/sphere fillet radii. Experiments indicated that the effect was restricted to Reynolds numbers below 4.0 x 10^5 and that the drag of the sphere/spike combination was actually increased at Reynolds numbers greater than this. A smoke generator was used to visualize the drag reduction mechanism, which appears to be a recirculating cell at the base of the sphere/spike intersection.
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Date Issued: 1989
PURL: http://purl.flvc.org/fcla/dt/14514
Subject Headings: Drag (Aerodynamics), Wind tunnel models
Format: Document (PDF)

Title: Turbulence modeling and simulation and related effects on helicopter response with wake dynamics using finite elements and parallelism.
Creator: Dang, Ying Yi., Florida Atlantic University, Gaonkar, Gopal H.
Abstract/Description: Future helicopters will require all-weather capability for stabilized flight through severe atmospheric turbulence. This requirement has brought into focus the effect of turbulence on handling qualities. Accordingly, there is renewed interest in modeling and simulating turbulence and predicting turbulence-induced rotor oscillations. This thesis addresses three fundamental aspects of the problem: (1) modeling and simulation of turbulence including cross-correlation; (2) three-dimensional...
Show moreFuture helicopters will require all-weather capability for stabilized flight through severe atmospheric turbulence. This requirement has brought into focus the effect of turbulence on handling qualities. Accordingly, there is renewed interest in modeling and simulating turbulence and predicting turbulence-induced rotor oscillations. This thesis addresses three fundamental aspects of the problem: (1) modeling and simulation of turbulence including cross-correlation; (2) three-dimensional dynamic-wake effects on rotor response to turbulence and (3) prediction of turbulence and response statistics. The analysis is based on the theory of isotropic and homogeneous turbulence and Taylor's frozen-field approximation. Quasisteady airfoil aerodynamics and a three-dimensional wake are used. Both the isolated blades and isolated rotors are treated. The parallelization is carried out on a massively parallel MasPar SIMD computer. Major conclusions include: (i) The effects of cross-correlation are negligible when two stations lie on the same blade and appreciable when two stations lie on different blades. (ii) In modeling the three-dimensional wake, 3 harmonics are required and dynamic wake has dominant influence on response statistics. (iii) With increasing comprehensiveness of helicopter-turbulence modeling, the sequential execution times increase dramatically; by comparison, the parallel execution times are far lower and, more significantly, remain nearly constant.
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Date Issued: 1995
PURL: http://purl.flvc.org/fcla/dt/15117
Subject Headings: Helicopters, Turbulence, Rotors (Helicopters), Boundary layer noise
Format: Document (PDF)

Title: Two-dimensional approximation and learning control of robot manipulators.
Creator: Gautam, Ashutosh., Florida Atlantic University, Zilouchian, Ali
Abstract/Description: In this thesis, a novel two-dimensional learning control scheme for robot manipulators is proposed. The convergence of the scheme for a general n-degree of freedom robot is shown. In the next part of the thesis, an algorithm for the approximation of a two-dimensional causal, recursive, separable-in-denominator (CRSD) filter, using the impulse response and autocorrelation data, is presented. The stability of the designed filter is discussed and it is shown that the approximated filter is...
Show moreIn this thesis, a novel two-dimensional learning control scheme for robot manipulators is proposed. The convergence of the scheme for a general n-degree of freedom robot is shown. In the next part of the thesis, an algorithm for the approximation of a two-dimensional causal, recursive, separable-in-denominator (CRSD) filter, using the impulse response and autocorrelation data, is presented. The stability of the designed filter is discussed and it is shown that the approximated filter is always stable. The simulation results for the approximation technique as well as the two-dimensional learning control scheme are also included in the thesis.
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Date Issued: 1989
PURL: http://purl.flvc.org/fcla/dt/14559
Subject Headings: Control theory, Manipulators (Mechanism), Robots
Format: Document (PDF)

Title: Tree-based classification models for analyzing a very large software system.
Creator: Bullard, Lofton A., Florida Atlantic University, Khoshgoftaar, Taghi M.
Abstract/Description: Software systems that control military radar systems must be highly reliable. A fault can compromise safety and security, and even cause death of military personnel. In this experiment we identify fault-prone software modules in a subsystem of a military radar system called the Joint Surveillance Target Attack Radar System, JSTARS. An earlier version was used in Operation Desert Storm to monitor ground movement. Product metrics were collected for different iterations of an operational...
Show moreSoftware systems that control military radar systems must be highly reliable. A fault can compromise safety and security, and even cause death of military personnel. In this experiment we identify fault-prone software modules in a subsystem of a military radar system called the Joint Surveillance Target Attack Radar System, JSTARS. An earlier version was used in Operation Desert Storm to monitor ground movement. Product metrics were collected for different iterations of an operational prototype of the subsystem over a period of approximately three years. We used these metrics to train a decision tree model and to fit a discriminant model to classify each module as fault-prone or not fault-prone. The algorithm used to generate the decision tree model was TREEDISC, developed by the SAS Institute. The decision tree model is compared to the discriminant model.
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Date Issued: 1996
PURL: http://purl.flvc.org/fcla/dt/15315
Subject Headings: Computer software--Quality control, Computer software--Reliability, Software engineering
Format: Document (PDF)

Title: Use of piezocone penetration tests for rapid in-situ characterization of Florida organic soil.
Creator: Huynh, Hieu H., Florida Atlantic University, Sobhan, Khaled
Abstract/Description: Organic soils generally are characterized by low strength and high compressibility. Visual observations of State Road 15/US 98 in western Palm Beach County, Florida indicate numerous cracking and significant rutting and raveling along the roadway caused by the consolidation and long-term secondary compression of the organic soils due to soil and pavement dead load. Since sampling of undisturbed soft organic soils is difficult, and subsequent laboratory tests are expensive and time-consuming,...
Show moreOrganic soils generally are characterized by low strength and high compressibility. Visual observations of State Road 15/US 98 in western Palm Beach County, Florida indicate numerous cracking and significant rutting and raveling along the roadway caused by the consolidation and long-term secondary compression of the organic soils due to soil and pavement dead load. Since sampling of undisturbed soft organic soils is difficult, and subsequent laboratory tests are expensive and time-consuming, there is a need for rapid in-situ characterization of these unstable foundation soils. This study evaluates the capabilities of Piezocone Penetration tests (CPTu), coupled with pore pressure dissipation tests, for estimating the strength, modulus, compressibility, and time rate of consolidation characteristics of organic soils and peat in Florida. The compression index (Cc) and coefficient of consolidation (cv), predicted from CPTu, showed reasonable correlation with laboratory-derived properties.
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Date Issued: 2006
PURL: http://purl.flvc.org/fcla/dt/13379
Subject Headings: Soil stabilization--Florida, Soil consolidation--Florida, Soil mechanics--Florida, Soil penetration test
Format: Document (PDF)

Title: Proceedings of the ... Conference on Recent Advances in Robotics.
Creator: Conference on Recent Advances in Robotics (Boca Raton), Florida Atlantic University
PURL: http://purl.flvc.org/fau/fd/FAadvancerob
Subject Headings: Robotics -- Congresses
Format: Serial

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