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- Title
- Forecasting foreign exchange rates using neural networks.
- Creator
- Talati, Amit H., Florida Atlantic University, Pandya, Abhijit S., College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
- Abstract/Description
-
Time series is a phenomena which appears in the financial world in various forms. One of the objectives of time series is to forecast the future based on the past. The goal of this thesis is to use foreign exchange time series, and predict its future values and trends using neural networks. The thesis covers background work in this area and discusses the results obtained by other researchers. A neural network is then developed to predict the future values of the USD/GBP and USD/DEM exchange...
Show moreTime series is a phenomena which appears in the financial world in various forms. One of the objectives of time series is to forecast the future based on the past. The goal of this thesis is to use foreign exchange time series, and predict its future values and trends using neural networks. The thesis covers background work in this area and discusses the results obtained by other researchers. A neural network is then developed to predict the future values of the USD/GBP and USD/DEM exchange rates. Both single-step and iterated multi-step predictions are considered. The performance of neural networks strongly depends on the inputs supplied. The effect of the changes in the number of inputs is also considered, and a method suggested for deciding on the optimum number. The forecasting of foreign exchange rates is a challenge because of the dynamic nature of the FOREX market and its dependencies on world events. The tool used for building the neural network and validating the approach is "Brainmaker".
Show less - Date Issued
- 2000
- PURL
- http://purl.flvc.org/fcla/dt/12699
- Subject Headings
- Foreign exchange rates--Mathmematical models, Foreign exchange--Forecasting--Mathematical models, Neural networks (Computer science)
- Format
- Document (PDF)
- Title
- Formal specification of authorization and user group models for object-oriented databases.
- Creator
- Wei, Dong., Florida Atlantic University, Fernandez, Eduardo B., France, Robert B., College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
- Abstract/Description
-
The use of formal methods has become increasingly important for software development. In this thesis, we present the formal specifications for a method-based authorization model for object-oriented databases. We also formalize a proposed user group structuring. We start from an existing OMT (Object Modeling Technique) description and we use Z as language for formal specification. This specification gives a precise definition of the policies and functions of this authorization system. This can...
Show moreThe use of formal methods has become increasingly important for software development. In this thesis, we present the formal specifications for a method-based authorization model for object-oriented databases. We also formalize a proposed user group structuring. We start from an existing OMT (Object Modeling Technique) description and we use Z as language for formal specification. This specification gives a precise definition of the policies and functions of this authorization system. This can be used as a basis for implementation and possible verification in those cases where a high level of security is required.
Show less - Date Issued
- 1995
- PURL
- http://purl.flvc.org/fcla/dt/15175
- Subject Headings
- Object-oriented databases, Computer software--Development, Database security
- Format
- Document (PDF)
- Title
- Evolution and application of a parallel algorithm for explicit transient finite element analysis on SIMD/MIMD computers.
- Creator
- Das, Partha S., Florida Atlantic University, Case, Robert O., Tsai, Chi-Tay, College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
- Abstract/Description
-
The development of a parallel data structure and an associated elemental decomposition algorithm for explicit finite element analysis for massively parallel SIMD computer, the DECmpp 12000 (MasPar MP-1) machine, is presented, and then extended to implementation on the MIMD computer, Cray-T3D. The new parallel data structure and elemental decomposition algorithm are discussed in detail and is used to parallelize a sequential Fortran code that deals with the application of isoparametric...
Show moreThe development of a parallel data structure and an associated elemental decomposition algorithm for explicit finite element analysis for massively parallel SIMD computer, the DECmpp 12000 (MasPar MP-1) machine, is presented, and then extended to implementation on the MIMD computer, Cray-T3D. The new parallel data structure and elemental decomposition algorithm are discussed in detail and is used to parallelize a sequential Fortran code that deals with the application of isoparametric elements for the nonlinear dynamic analysis of shells of revolution. The parallel algorithm required the development of a new procedure, called an 'exchange', which consists of an exchange of nodal forces at each time step to replace the standard gather-assembly operations in sequential code. In addition, the data was reconfigured so that all nodal variables associated with an element are stored in a processor along with other element data. The architectural and Fortran programming language features of the MasPar MP-1 and Cray-T3D computers which are pertinent to finite element computations are also summarized, and sample code segments are provided to illustrate programming in a data parallel environment. The governing equations, the finite element discretization and a comparison between their implementation on Von Neumann and SIMD-MIMD parallel computers are discussed to demonstrate their applicability and the important differences in the new algorithm. Various large scale transient problems are solved using the parallel data structure and elemental decomposition algorithm and measured performances are presented and analyzed in detail. Results show that Cray-T3D is a very promising parallel computer for finite element computation. The 32 processors of this machine shows an overall speedup of 27-28, i.e. an efficiency of 85% or more and 128 processors shows a speedup of 70-77, i.e. an efficiency of 55% or more. The Cray-T3D results demonstrated that this machine is capable of outperforming the Cray-YMP by a factor of about 10 for finite element problems with 4K elements, therefore, the method of developing the parallel data structure and its associated elemental decomposition algorithm is recommended for implementation on other finite element code in this machine. However, the results from MasPar MP-1 show that this new algorithm for explicit finite element computations do not produce very efficient parallel code on this computer and therefore, the new data structure is not recommended for further use on this MasPar machine.
Show less - Date Issued
- 1997
- PURL
- http://purl.flvc.org/fcla/dt/12500
- Subject Headings
- Finite element method, Algorithms, Parallel computers
- Format
- Document (PDF)
- Title
- Ensemble-classifier approach to noise elimination: A case study in software quality classification.
- Creator
- Joshi, Vedang H., Florida Atlantic University, Khoshgoftaar, Taghi M., College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
- Abstract/Description
-
This thesis presents a noise handling technique that attempts to improve the quality of training data for classification purposes by eliminating instances that are likely to be noise. Our approach uses twenty five different classification techniques to create an ensemble of classifiers that acts as a noise filter on real-world software measurement datasets. Using a relatively large number of base-level classifiers for the ensemble-classifier filter facilitates in achieving the desired level...
Show moreThis thesis presents a noise handling technique that attempts to improve the quality of training data for classification purposes by eliminating instances that are likely to be noise. Our approach uses twenty five different classification techniques to create an ensemble of classifiers that acts as a noise filter on real-world software measurement datasets. Using a relatively large number of base-level classifiers for the ensemble-classifier filter facilitates in achieving the desired level of noise removal conservativeness with several possible levels of filtering. It also provides a higher degree of confidence in the noise elimination procedure as the results are less likely to get influenced by (possible) inappropriate learning bias of a few algorithms with twenty five base-level classifiers than with a relatively smaller number of base-level classifiers. Empirical case studies of two different high assurance software projects demonstrate the effectiveness of our noise elimination approach by the significant improvement achieved in classification accuracies at various levels of filtering.
Show less - Date Issued
- 2004
- PURL
- http://purl.flvc.org/fcla/dt/13144
- Subject Headings
- Computer interfaces--Software--Quality control, Acoustical engineering, Noise control--Case studies, Expert systems (Computer science), Software documentation
- Format
- Document (PDF)
- Title
- Enhancing video quality based on psychophysical studies of smooth pursuit eye movements.
- Creator
- Chilamakuri, Pavani., Florida Atlantic University, Furht, Borko, Glenn, William E., College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
- Abstract/Description
-
When motion occurs in a scene, the quality of video degrades due to motion smear, which results in a loss of contrast in the image. The characteristics of the human vision system when smooth pursuit eye movements occur are different from those when the eye fixates on an object such as a video screen during motion. Smooth pursuit eye movements dominate in the presence of dynamic stimuli. In the presence of smooth pursuit eye movements, the contrast sensitivity for increasing target velocities...
Show moreWhen motion occurs in a scene, the quality of video degrades due to motion smear, which results in a loss of contrast in the image. The characteristics of the human vision system when smooth pursuit eye movements occur are different from those when the eye fixates on an object such as a video screen during motion. Smooth pursuit eye movements dominate in the presence of dynamic stimuli. In the presence of smooth pursuit eye movements, the contrast sensitivity for increasing target velocities shifts toward lower spatial frequencies. The sensitivity for low spatial frequencies during motion is higher than for a stationary case. This dissertation will propose a method to improve the perceptual quality of video using temporal enhancement prefiltering technique based on the characteristics of Smooth Pursuit Eye Movements (SPEM). The resulting technique closely matches the characteristics of the human visual system (HVS). When motion occurs, the eye tracks the moving targets in a scene as opposed to fixating on any portion of the scene. Hence, psychophysical studies of smooth pursuit eye movements were used as a basis to design the temporal filters. Results of experiments show that temporal enhancement results in improved quality by increasing the apparent sharpness of the image sequence. In this dissertation, a study of research describing how motion affects the image quality at the camera lens and the human eye is presented. This dissertation uses that research to develop a temporal enhancement technique to improve the quality of video degraded by motion.
Show less - Date Issued
- 2003
- PURL
- http://purl.flvc.org/fau/fd/FADT12035
- Subject Headings
- Eye--Movements, Digital video, Visual perception, Video compression
- Format
- Document (PDF)
- 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.
Show less - 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)
- Title
- Imagination at work: Improving adult literacy with the "Harry Potter" novels.
- Creator
- Bamdas, Jo Ann, Florida Atlantic University, Burks, Valerie C., Dorothy F. Schmidt College of Arts and Letters, Department of Languages, Linguistics and Comparative Literature
- Abstract/Description
-
Global illiteracy remains rampant partly due to confusing definitions, inadequate data gathering, hidden agendas, and improper tools of stimulation. Adult literacy is a problem despite efforts and resources. Using children's and adolescents' literature can improve literacy but it is not being used enough due to false concepts. The problems and an adult non-reader profile are outlined. Current literature on literacy, children's literature theory, and critical plus public intellectual media in...
Show moreGlobal illiteracy remains rampant partly due to confusing definitions, inadequate data gathering, hidden agendas, and improper tools of stimulation. Adult literacy is a problem despite efforts and resources. Using children's and adolescents' literature can improve literacy but it is not being used enough due to false concepts. The problems and an adult non-reader profile are outlined. Current literature on literacy, children's literature theory, and critical plus public intellectual media in academia and popular culture is reviewed. I borrow Martha Nussbaum's idea of the narrative imagination to explore J. K. Rowling's Harry Potter novels. I analyze and then provide a program sketch showing how adults can learn to read while building self-esteem because of innate familiarity with the storytelling tradition, with language, and with ordinary life issues. The literature fosters narrative imagination and encourages discussion. Each new adult reader then adds to the cultivation of humanity.
Show less - Date Issued
- 2002
- PURL
- http://purl.flvc.org/fcla/dt/12902
- Subject Headings
- Rowling, J K--Criticism and interpretation, Functional literacy, Criticism, Children's literature
- Format
- Document (PDF)
- Title
- IPTV on copper-lines converging into "all-optical" trunk transport: A next-generation local-loop solution.
- Creator
- Perez, Angela S., Florida Atlantic University, Neelakanta, Perambur S., College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
- Abstract/Description
-
A promising next-generation version of service that could be availed from local exchange carriers (LECs) refers to streaming Internet protocol based television (IPTV) programs into subscriber premises via traditional copper pairs. The present study addresses provisioning economically-budgeted and optimally-engineered bit rates (EBRs) in implementing IPTV technology in the local-loop via copper-pairs using the so-called (ADSL2/ADSL2+) technology (with high-speed/large bandwidth considerations...
Show moreA promising next-generation version of service that could be availed from local exchange carriers (LECs) refers to streaming Internet protocol based television (IPTV) programs into subscriber premises via traditional copper pairs. The present study addresses provisioning economically-budgeted and optimally-engineered bit rates (EBRs) in implementing IPTV technology in the local-loop via copper-pairs using the so-called (ADSL2/ADSL2+) technology (with high-speed/large bandwidth considerations plus copper-bonding for bandwidth sharing capabilities). Also studied is the way to extend the backhaul transport of IPTV on copper-lines (plus any other local-loop transmissions that may co-exist) onto an "all-optical" trunk of the inter-office facilities (IOFs) in the edge/core network cloud of the telcos. A model of a core network topology is analyzed for traffic considerations so as to decide on blocking probability at a specified egress node under different conditions of burstiness. The problems posed are analyzed via computations/simulations on Matlab(TM) (v6.5). Inferential remarks are gathered, conclusions are drawn and open-questions yet to be researched are indicated.
Show less - Date Issued
- 2006
- PURL
- http://purl.flvc.org/fcla/dt/13395
- Subject Headings
- Telecommunication wiring, Data transmission systems, TCP/IP (Computer network protocol)
- Format
- Document (PDF)
- Title
- Improved models of software quality.
- Creator
- Szabo, Robert Michael., Florida Atlantic University, Khoshgoftaar, Taghi M., College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
- Abstract/Description
-
Though software development has been evolving for over 50 years, the development of computer software systems has largely remained an art. Through the application of measurable and repeatable processes, efforts have been made to slowly transform the software development art into a rigorous engineering discipline. The potential gains are tremendous. Computer software pervades modern society in many forms. For example, the automobile, radio, television, telephone, refrigerator, and still-camera...
Show moreThough software development has been evolving for over 50 years, the development of computer software systems has largely remained an art. Through the application of measurable and repeatable processes, efforts have been made to slowly transform the software development art into a rigorous engineering discipline. The potential gains are tremendous. Computer software pervades modern society in many forms. For example, the automobile, radio, television, telephone, refrigerator, and still-camera have all been transformed by the introduction of computer based controls. The quality of these everyday products is in part determined by the quality of the computer software running inside them. Therefore, the timely delivery of low-cost and high-quality software to enable these mass market products becomes very important to the long term success of the companies building them. It is not surprising that managing the number of faults in computer software to competitive levels is a prime focus of the software engineering activity. In support of this activity, many models of software quality have been developed to help control the software development process and ensure that our goals of cost and quality are met on time. In this study, we focus on the software quality modeling activity. We improve existing static and dynamic methodologies and demonstrate new ones in a coordinated attempt to provide engineering methods applicable to the development of computer software. We will show how the power of separate predictive and classification models of software quality may be combined into one model; introduce a three group fault classification model in the object-oriented paradigm; demonstrate a dynamic modeling methodology of the testing process and show how software product measures and software process measures may be incorporated as input to such a model; demonstrate a relationship between software product measures and the testability of software. The following methodologies were considered: principal components analysis, multiple regression analysis, Poisson regression analysis, discriminant analysis, time series analysis, and neural networks. Commercial grade software systems are used throughout this dissertation to demonstrate concepts and validate new ideas. As a result, we hope to incrementally advance the state of the software engineering "art".
Show less - Date Issued
- 1995
- PURL
- http://purl.flvc.org/fcla/dt/12409
- Subject Headings
- Software engineering--Standards, Software engineering--Management, Computer software--Development, Computer software--Quality control
- Format
- Document (PDF)
- Title
- Performance study of some diversity schemes in a Nakagami fading channel.
- Creator
- Sannegowda, Ramesh Panditan., Florida Atlantic University, Aalo, Valentine A., College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
- Abstract/Description
-
Closed form results for the symbol error probabilities are derived for M-ary, L branch Selection diversity schemes and Partial Decision combining schemes in a Nakagami fading environment using noncoherent frequency-shift keying modulation. The Maximum SNR selection, the Maximum output selection, the Optimal partial decision, and the Majority voting schemes are considered in this analysis. The analysis is not limited to integer values of the Nakagami fading parameter m. Results for the...
Show moreClosed form results for the symbol error probabilities are derived for M-ary, L branch Selection diversity schemes and Partial Decision combining schemes in a Nakagami fading environment using noncoherent frequency-shift keying modulation. The Maximum SNR selection, the Maximum output selection, the Optimal partial decision, and the Majority voting schemes are considered in this analysis. The analysis is not limited to integer values of the Nakagami fading parameter m. Results for the Rayleigh fading channel are obtained and presented as special cases of those of the Nakagami fading model. The symbol error probability when the diversity branches undergo different fading statistics with unequal mean SNR are considered for the Maximum SNR selection scheme. Outage probabilities are also calculated for some of the diversity combining schemes. A comparison of all the four schemes are discussed using the performance curves.
Show less - Date Issued
- 1994
- PURL
- http://purl.flvc.org/fcla/dt/15011
- Subject Headings
- Electromagnetic waves--Transmission, Radio--Transmitters and transmission--Fading, Radio waves--Scattering
- Format
- Document (PDF)
- Title
- Performance of wireless communication systems under various data traffic density distributions.
- Creator
- Kyperountas, Spyros C., Florida Atlantic University, Aalo, Valentine A., College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
- Abstract/Description
-
This thesis is concerned with the performance analysis of mobile cellular systems under various distributions of portable users. The performance measure used is the average outage probability. Performance analysis is performed for macrocellular as well as microcellular systems, for different distributions of mobile users such as uniform, ring, and bell distribution. The outage probability is evaluated for systems with hexagonal, triangular, and square grid layouts. The effect of macroscopic...
Show moreThis thesis is concerned with the performance analysis of mobile cellular systems under various distributions of portable users. The performance measure used is the average outage probability. Performance analysis is performed for macrocellular as well as microcellular systems, for different distributions of mobile users such as uniform, ring, and bell distribution. The outage probability is evaluated for systems with hexagonal, triangular, and square grid layouts. The effect of macroscopic diversity on system performance is also considered. Finally, computer simulations are used to verify the evaluated results.
Show less - Date Issued
- 1998
- PURL
- http://purl.flvc.org/fcla/dt/15578
- Subject Headings
- Wireless communication systems, Cellular radio, Mobile communication systems
- Format
- Document (PDF)
- Title
- Performance analysis of K-means algorithm and Kohonen networks.
- Creator
- Syed, Afzal A., Florida Atlantic University, Pandya, Abhijit S., College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
- Abstract/Description
-
K-means algorithm and Kohonen network possess self-organizing characteristics and are widely used in different fields currently. The factors that influence the behavior of K-means are the choice of initial cluster centers, number of cluster centers and the geometric properties of the input data. Kohonen networks have the ability of self-organization without any prior input about the number of clusters to be formed. This thesis looks into the performances of these algorithms and provides a...
Show moreK-means algorithm and Kohonen network possess self-organizing characteristics and are widely used in different fields currently. The factors that influence the behavior of K-means are the choice of initial cluster centers, number of cluster centers and the geometric properties of the input data. Kohonen networks have the ability of self-organization without any prior input about the number of clusters to be formed. This thesis looks into the performances of these algorithms and provides a unique way of combining them for better clustering. A series of benchmark problem sets are developed and run to obtain the performance analysis of the K-means algorithm and Kohonen networks. We have attempted to obtain the better of these two self-organizing algorithms by providing the same problem sets and extract the best results based on the users needs. A toolbox, which is user-friendly and written in C++ and VC++ is developed for applications on both images and feature data sets. The tool contains K-means algorithm and Kohonen networks code for clustering and pattern classification.
Show less - Date Issued
- 2004
- PURL
- http://purl.flvc.org/fcla/dt/13112
- Subject Headings
- Self-organizing maps, Neural networks (Computer science), Cluster analysis--Computer programs, Computer algorithms
- Format
- Document (PDF)
- Title
- Performance analysis of a new object-based I/O architecture for PCs and workstations.
- Creator
- Huynh, Khoa Dang., Florida Atlantic University, Khoshgoftaar, Taghi M., College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
- Abstract/Description
-
In this dissertation, an object-based I/O architecture for personal computers (PCs) and workstations is proposed. The proposed architecture allows the flexibility of having I/O processing performed as much as possible by intelligent I/O adapters, or by the host processor, or by any processor in the system, depending on application requirements and underlying hardware capabilities. It keeps many good features of current I/O architectures, while providing more flexibility to take advantage of...
Show moreIn this dissertation, an object-based I/O architecture for personal computers (PCs) and workstations is proposed. The proposed architecture allows the flexibility of having I/O processing performed as much as possible by intelligent I/O adapters, or by the host processor, or by any processor in the system, depending on application requirements and underlying hardware capabilities. It keeps many good features of current I/O architectures, while providing more flexibility to take advantage of new hardware technologies, promote architectural openness, provide better performance and higher reliability. The proposed architecture introduces a new definition of I/O subsystems and makes use of concurrent object-oriented technology. It combines the notions of object and thread into something called an active object. All concurrency abstractions required by the proposed architecture are provided through external libraries on top of existing sequential object-oriented languages, without any changes to the syntax and semantics of these languages. We also evaluate the performance of optimal implementations of the proposed I/O architecture against other I/O architectures in three popular, PC-based, distributed environments: network file server, video server, and video conferencing. Using the RESearch Queueing Modeling Environment (RESQME), we have developed detailed simulation models for various implementations of the proposed I/O architecture and two other existing I/O architectures: a conventional, interrupt-based I/O architecture and a peer-to-peer I/O architecture. Our simulation results indicate that, on several different hardware platforms, the proposed I/O architecture outperforms both existing architectures in all three distributed environments considered.
Show less - Date Issued
- 1994
- PURL
- http://purl.flvc.org/fcla/dt/12386
- Subject Headings
- Local area networks (Computer networks), Computer input-output equipment, Computer networks, Videoconferencing, Client/server computing, Object-oriented programming (Computer science)
- Format
- Document (PDF)
- Title
- Performance analysis of a very fast packet switching system for broadband ISDN.
- Creator
- Rao, Radha Nallur Seshagiri., Florida Atlantic University, Ilyas, Mohammad, College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
- Abstract/Description
-
Rapid advances in technology have resulted in the evolution of Integrated Services Digital Networks (ISDNs) to Broadband ISDNs (BISDNs). This thesis discusses and evaluates the performance of a high speed and high capacity packet switching system architecture for BISDNs. This system supports various high speed communication services like data, voice, and video services. The main performance criterion is the mean switching delay, which is defined as the packet transfer delay through the bus...
Show moreRapid advances in technology have resulted in the evolution of Integrated Services Digital Networks (ISDNs) to Broadband ISDNs (BISDNs). This thesis discusses and evaluates the performance of a high speed and high capacity packet switching system architecture for BISDNs. This system supports various high speed communication services like data, voice, and video services. The main performance criterion is the mean switching delay, which is defined as the packet transfer delay through the bus and through the loop connecting various switch modules in the system. Other performance criteria are power and system throughput. The performance parameters are evaluated separately for both data and control (signaling) packets. The effects of the number of switch modules in the system, the data packet length, and the ratio of arrival rate of data to control packets are examined. It is observed that the switching delay and throughput increase with an increase in the traffic intensity for any number of switching modules and the ratio of arrival rate of data to control packets. The delay for data packets is found to be higher for lower values of this ratio and vice versa. The power is found to be maximum for about 70% load. The switching delay in this simulation model is found to be less than one millisecond for data packets.
Show less - Date Issued
- 1990
- PURL
- http://purl.flvc.org/fcla/dt/14603
- Subject Headings
- Packet switching (Data transmission), Integrated services digital networks, Broadband communication systems
- Format
- Document (PDF)
- Title
- Permutation-based transformations for digital multimedia encryption and steganography.
- Creator
- Socek, Daniel, Florida Atlantic University, Furht, Borko, Magliveras, Spyros S., College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
- Abstract/Description
-
The aim of this work is to explore the utilization of permutation-based transformations to achieve compression, encryption and steganography in the domain of digital videos. The main contribution of this dissertation is a novel type of digital video encryption that has several advantages over other currently available digital video encryption methods. An extended classification of digital video encryption algorithms is presented in order to clarify these advantages. The classification itself...
Show moreThe aim of this work is to explore the utilization of permutation-based transformations to achieve compression, encryption and steganography in the domain of digital videos. The main contribution of this dissertation is a novel type of digital video encryption that has several advantages over other currently available digital video encryption methods. An extended classification of digital video encryption algorithms is presented in order to clarify these advantages. The classification itself represents an original work, since to date, no such comprehensive classification is provided in known scientific literature. Both security and performance aspects of the proposed method are thoroughly analyzed to provide evidence for high security and performance efficiency. Since the basic model is feasible only for a certain class of video sequences and video codecs, several extensions providing broader applicability are described along with the basic algorithm. An additional significant contribution is the proposition of a novel type of digital video steganography based on disguising a given video by another video. Experimental results are generated for a number of video sequences to demonstrate the performance of proposed methods.
Show less - Date Issued
- 2006
- PURL
- http://purl.flvc.org/fcla/dt/12225
- Subject Headings
- Image processing--Security measures, Data encryption (Computer science), Computer security, Multimedia systems--Security measures
- Format
- Document (PDF)
- Title
- THE PREPARATION OF BEGINNING ENGLISH READING MATERIALS FOR MIKASUKI SPEAKERS.
- Creator
- KRUSE, KATRINA MARGUERITE., Florida Atlantic University, Trammell, Robert L., Dorothy F. Schmidt College of Arts and Letters, Department of Languages, Linguistics and Comparative Literature
- Abstract/Description
-
A sequence for materials in English beginning reading lessons is proposed for native speakers of Mikasuki. This sequence utilizes to the greatest possible extent the native linguistic background of Mikasuki-speaking students while including most of the skills taught to native English speakers in traditional materials. The presentation is based on two criteria: 1) an analysis of the phonological similarities and differences between Mikasuki and English, and 2) a linguistic approach to...
Show moreA sequence for materials in English beginning reading lessons is proposed for native speakers of Mikasuki. This sequence utilizes to the greatest possible extent the native linguistic background of Mikasuki-speaking students while including most of the skills taught to native English speakers in traditional materials. The presentation is based on two criteria: 1) an analysis of the phonological similarities and differences between Mikasuki and English, and 2) a linguistic approach to beginning reading instruction, which emphasizes the gradual and systematic introduction of regular sound-spelling patterns. Using these criteria it is possible to order the presentation of English phonemes and graphemes in terms of their predicted difficulty for the Mikasuki-speaking student. These are systematically presented to improve the Mikasuki-speaker's chances of establishing a, positive achievement base at each stage of the learning process.
Show less - Date Issued
- 1975
- PURL
- http://purl.flvc.org/fcla/dt/13699
- Subject Headings
- Language, Linguistics
- Format
- Document (PDF)
- Title
- PERFORMANCE EVALUATION OF A RIDGE 32 COMPUTER SYSTEM (RISC (REDUCED INSTRUCTION SET COMPUTER)).
- Creator
- YOON, SEOK TAE., Florida Atlantic University, Fernandez, Eduardo B., College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
- Abstract/Description
-
As a new trend in designing a computer architecture, Reduced Instruction set Computers(RISC) have been proposed recently. This thesis reviews the new design approach behind the RISC and discuss the controversy between the proponents of the RISC approach and those of the traditional Complex Instruction set COmputer(CISC) approach. Ridge 32 is selected as a case study of the RISCs. Architectural parameters to evaluate the computer performance are considered to analyze the performance of the...
Show moreAs a new trend in designing a computer architecture, Reduced Instruction set Computers(RISC) have been proposed recently. This thesis reviews the new design approach behind the RISC and discuss the controversy between the proponents of the RISC approach and those of the traditional Complex Instruction set COmputer(CISC) approach. Ridge 32 is selected as a case study of the RISCs. Architectural parameters to evaluate the computer performance are considered to analyze the performance of the Ridge 32. A simulator for the Ridge 32 was implemented in PASCAL as a way of measuring those parameters. Measurement results on the several selected benchmark programs are given and analyzed to evaluate the characteristics of the Ridge 32.
Show less - Date Issued
- 1986
- PURL
- http://purl.flvc.org/fcla/dt/14348
- Subject Headings
- Computer architecture, Microprocessors
- Format
- Document (PDF)
- Title
- Prediction of software quality using classification tree modeling.
- Creator
- Naik, Archana B., Florida Atlantic University, Khoshgoftaar, Taghi M., College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
- Abstract/Description
-
Reliability of software systems is one of the major concerns in today's world as computers have really become an integral part of our lives. Society has become so dependent on reliable software systems that failures can be dangerous in terms of worsening a company's business, human relationships or affecting human lives. Software quality models are tools for focusing efforts to find faults early in the development. In this experiment, we used classification tree modeling techniques to predict...
Show moreReliability of software systems is one of the major concerns in today's world as computers have really become an integral part of our lives. Society has become so dependent on reliable software systems that failures can be dangerous in terms of worsening a company's business, human relationships or affecting human lives. Software quality models are tools for focusing efforts to find faults early in the development. In this experiment, we used classification tree modeling techniques to predict the software quality by classifying program modules either as fault-prone or not fault-prone. We introduced the Classification And Regression Trees (scCART) algorithm as a tool to generate classification trees. We focused our experiments on very large telecommunications system to build quality models using set of product and process metrics as independent variables.
Show less - Date Issued
- 1998
- PURL
- http://purl.flvc.org/fcla/dt/15600
- Subject Headings
- Computer software--Quality control, Computer software--Evaluation, Software measurement
- Format
- Document (PDF)
- Title
- Power system modeling and optimization methods vis-a-vis integrated resource planning (IRP).
- Creator
- Arsali, Mohammad H., Florida Atlantic University, Neelakanta, Perambur S., College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
- Abstract/Description
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The state-of-the-art restructuring of power industries is changing the fundamental nature of retail electricity business. As a result, the so-called Integrated Resource Planning (IRP) strategies implemented on electric utilities are also undergoing modifications. Such modifications evolve from the imminent considerations to minimize the revenue requirements and maximize electrical system reliability vis-a-vis capacity-additions (viewed as potential investments). IRP modifications also provide...
Show moreThe state-of-the-art restructuring of power industries is changing the fundamental nature of retail electricity business. As a result, the so-called Integrated Resource Planning (IRP) strategies implemented on electric utilities are also undergoing modifications. Such modifications evolve from the imminent considerations to minimize the revenue requirements and maximize electrical system reliability vis-a-vis capacity-additions (viewed as potential investments). IRP modifications also provide service-design bases to meet the customer needs towards profitability. The purpose of this research as deliberated in this dissertation is to propose procedures for optimal IRP intended to expand generation facilities of a power system over a stretched period of time. Relevant topics addressed in this research towards IRP optimization are as follows: (1) Historical prospective and evolutionary aspects of power system production-costing models and optimization techniques; (2) A survey of major U.S. electric utilities adopting IRP under changing socioeconomic environment; (3) A new technique designated as the Segmentation Method for production-costing via IRP optimization; (4) Construction of a fuzzy relational database of a typical electric power utility system for IRP purposes; (5) A genetic algorithm based approach for IRP optimization using the fuzzy relational database.
Show less - Date Issued
- 1998
- PURL
- http://purl.flvc.org/fcla/dt/12567
- Subject Headings
- Electric utilities--United States, Electric power system--United States
- Format
- Document (PDF)
- Title
- Negotiation of meaning in interlanguage talk.
- Creator
- Tegge, Friederike A., Florida Atlantic University, DuBravac, Stayc, Department of Languages, Linguistics and Comparative Literature, Dorothy F. Schmidt College of Arts and Letters
- Abstract/Description
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This small-scale study investigated the extent to which negotiations of meaning during methodologically focused communicative partner-activities were concerned with a grammatical target structure, the dative case following spatial prepositions in German. In addition, the impact of the negotiation of the target structure on subsequent learner performance was investigated. The subjects, beginning-level students of German, participated in two two-way information-gap activities, preceded and...
Show moreThis small-scale study investigated the extent to which negotiations of meaning during methodologically focused communicative partner-activities were concerned with a grammatical target structure, the dative case following spatial prepositions in German. In addition, the impact of the negotiation of the target structure on subsequent learner performance was investigated. The subjects, beginning-level students of German, participated in two two-way information-gap activities, preceded and followed by the same grammaticality judgment test. The interaction was audiotaped and transcribed. The improvement in accuracy between the pretest and the posttest was calculated and correlated with the number of negotiation moves. The results indicate that the subjects negotiated meaning, including form, frequently. However, no significant change in the subjects' subsequent performance was observed.
Show less - Date Issued
- 2004
- PURL
- http://purl.flvc.org/fcla/dt/13114
- Subject Headings
- Interlanguage (Language learning), Language transfer (Language learning), Second language acquisition
- Format
- Document (PDF)