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- Title
- Visual wavelength discrimination by the loggerhead turtle, Caretta caretta.
- Creator
- Young, Morgan, Charles E. Schmidt College of Science, Department of Biological Sciences
- Abstract/Description
-
Little is known about the visual capabilities of marine turtles. The ability to discriminate between colors has not been adequately demonstrated on the basis of behavioral criteria. I used a three-part methodology to determine if color discrimination occurred. FIrst, I exposed naèive, light-adapted hatchlings to either a blue, green or yellow light. I manipulated light intensity to obtain a behavioral phototaxis threshold to each color, which provided a range of intensities we knew turtles...
Show moreLittle is known about the visual capabilities of marine turtles. The ability to discriminate between colors has not been adequately demonstrated on the basis of behavioral criteria. I used a three-part methodology to determine if color discrimination occurred. FIrst, I exposed naèive, light-adapted hatchlings to either a blue, green or yellow light. I manipulated light intensity to obtain a behavioral phototaxis threshold to each color, which provided a range of intensities we knew turtles could detect. Second, I used food to train older turtles to swim toward one light color, and then to discriminate between the rewarded light and another light color ; lights were presented at intensities equally above the phototaxis threshold. Lastly, I varied light intensity so that brightness could not be used as a discrimination cue. Six turtles completed this task and showed a clear ability to select a rewarded over a non-rewarded color, regardless of stimulus intensity. Turtles most rapidly learned to associate shorter wavelengths (blue) with food. My results clearly show loggerheads have color vision. Further investigation is required to determine how marine turtles exploit this capability.
Show less - Date Issued
- 2012
- PURL
- http://purl.flvc.org/FAU/3352879
- Subject Headings
- Color vision, Visual discrimination, VIsual perception, Selectivity (Psychology), Photoreceptors, Loggerhead turtle, Orientation, Sea turtles, Orientation, Animal navigation
- Format
- Document (PDF)
- Title
- Can hatchlings exposed to beach lighting recover, and orient normally offshore?.
- Creator
- Lorne, Jacquelyn Kay, Florida Atlantic University, Salmon, Michael
- Abstract/Description
-
Artificial lighting disrupts sea turtle hatchling orientation from the nest to the sea. I studied how a light-induced landward crawl affects the ability of hatchlings to later crawl to the sea, and swim offshore from a dark beach. A brief (2 min) landward crawl had no effect on orientation, as long as waves (used as an orientation cue while swimming) were present. In the absence of waves (a flat calm sea), landward-crawling hatchlings failed to swim offshore while those crawling seaward were...
Show moreArtificial lighting disrupts sea turtle hatchling orientation from the nest to the sea. I studied how a light-induced landward crawl affects the ability of hatchlings to later crawl to the sea, and swim offshore from a dark beach. A brief (2 min) landward crawl had no effect on orientation, as long as waves (used as an orientation cue while swimming) were present. In the absence of waves (a flat calm sea), landward-crawling hatchlings failed to swim offshore while those crawling seaward were well oriented. A longer (2 h) landward crawl impaired the ability of hatchlings to crawl to the sea. These results demonstrate that previous exposure to artificial lighting compromises subsequent orientation, both on land and in the sea. On the basis of my results, I suggest several changes to current management practices, currently used when releasing misoriented turtles in the wild.
Show less - Date Issued
- 2006
- PURL
- http://purl.flvc.org/fcla/dt/13400
- Subject Headings
- Sea turtles--Atlantic Coast (U S )--Geographical distribution, Light pollution, Animal orientation, Loggerhead turtle--Orientation, Animal navigation
- Format
- Document (PDF)
- Title
- Do embedded roadway lights protect sea turtles?.
- Creator
- Bertolotti, Lesley L., Florida Atlantic University, Salmon, Michael
- Abstract/Description
-
Pole-mounted street lighting on coastal roadways is often visible in adjacent areas. At roadways near sea turtle nesting beaches, these lights can disrupt the nocturnal orientation of hatchlings as they crawl from the nest to the sea. Our objective was to determine if an alternative lighting system (light-emitting diodes, embedded in the roadway pavement) prevented orientation disruption of loggerhead hatchlings. Hatchlings at the beach oriented normally when the embedded lights were on, or...
Show morePole-mounted street lighting on coastal roadways is often visible in adjacent areas. At roadways near sea turtle nesting beaches, these lights can disrupt the nocturnal orientation of hatchlings as they crawl from the nest to the sea. Our objective was to determine if an alternative lighting system (light-emitting diodes, embedded in the roadway pavement) prevented orientation disruption of loggerhead hatchlings. Hatchlings at the beach oriented normally when the embedded lights were on, or when all lighting was switched off. However, turtles showed poor orientation when exposed to pole-mounted street lighting. Light measurements revealed that street lighting was present at the beach, whereas embedded lighting was absent. I conclude that embedded lighting systems restrict light scatter, leaving adjacent habitats dark, and therefore protect the turtles from artificial lighting allowing for normal seafinding.
Show less - Date Issued
- 2005
- PURL
- http://purl.flvc.org/fcla/dt/13203
- Subject Headings
- Loggerhead turtle, Animal navigation, Animal orientation, Sea turtles--Orientation, Exterior lighting--Environmental aspects, Light pollution
- Format
- Document (PDF)
- Title
- Christine E. Lynn College of Nursing library tutorial.
- Creator
- Borglund, Susan T., Allen, Ethan J., McMullen, Lindsey, Roshaven, Patricia, Christine E. Lynn College of Nursing
- Date Issued
- 2006-08
- PURL
- http://purl.flvc.org/fcla/dt/11494
- Subject Headings
- Florida Atlantic University. College of Nursing --Curricula, Library orientation, Nursing students, Florida Atlantic University. Libraries, Information literacy, Information resources, Library orientation, Library research
- Format
- Document (PDF)
- Title
- Electric motor control system with application to marine propulsion.
- Creator
- Roa, Camilo Carlos, College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
- Abstract/Description
-
This thesis analyses the behavior of an induction motor based on a mathematical model created for its simulation. The model describes the interaction of its several non linear differential equations to present a simulated output of induced torque and mechanical speed. Considering the applications to marine propulsion, it is also the goal of the project to design and test a control system for the speed of the motor by maintaining a specific cruse speed regardless the perturbations.
- Date Issued
- 2010
- PURL
- http://purl.flvc.org/FAU/2705080
- Subject Headings
- Electric motors, Induction, Electric propulsion, Field orientation principle (Electric engineering), Ships, Hydrodynamics
- Format
- Document (PDF)
- Title
- A Modeling Methodology for an RTOS.
- Creator
- Islam, Sifat, Shankar, Ravi, Florida Atlantic University
- Abstract/Description
-
Enhanced system design productivity is key to satisfying time-to-market demands. One will have to exploit design reuse methodology to meet project schedule requirements. Integration of components often fails due to various concurrency violations. Concurrency issues arise when components executing in parallel share resources and interact with each other. Such a system may have intermittent, yet catastrophic failures, if these concurrency issues are not addressed properly. In this thesis, we...
Show moreEnhanced system design productivity is key to satisfying time-to-market demands. One will have to exploit design reuse methodology to meet project schedule requirements. Integration of components often fails due to various concurrency violations. Concurrency issues arise when components executing in parallel share resources and interact with each other. Such a system may have intermittent, yet catastrophic failures, if these concurrency issues are not addressed properly. In this thesis, we propose a methodology for developing concurrency compliant components from a requirement document. We have applied this methodology for developing process management and memory management aspects of a Real Time Operating System (RTOS). In this methodology, we start from a "customer' s" requirement document that is then mapped to activity diagram, swimlane diagram, class diagrams, and use case diagrams. To evolve a concurrency compliant design, we use the Message Sequence Chart plug-in for the Labeled Transition State Analyzer (LTSA). This plug-in lets us use Message Sequence Charts rather than coding in Finite State Processes (FSP). Later, we use MLDesigner to simulate our R TOS sub-system and demonstrate proper behavior of this sub-system.
Show less - Date Issued
- 2007
- PURL
- http://purl.flvc.org/fau/fd/FA00012528
- Subject Headings
- Computer architecture, Object-oriented programming (Computer science), Real-time programming, Operating systems (Computers)
- Format
- Document (PDF)
- Title
- Reducing impedance mismatch in SQL embeddings for object-oriented programming languages.
- Creator
- Hurtado, Jose Luis, College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
- Abstract/Description
-
We survey and compare the different major mechanisms for embedding the relational database language SQL in object-oriented programming languages such as Java and C#, with regard to how much impedance mismatch these embeddings suffer. Here impedance mismatch refers to clarity and performance difficulties that arise because of the nature of the embedding. Because of the central position in the information technology industry of object-oriented programs that access SQL-based relational database...
Show moreWe survey and compare the different major mechanisms for embedding the relational database language SQL in object-oriented programming languages such as Java and C#, with regard to how much impedance mismatch these embeddings suffer. Here impedance mismatch refers to clarity and performance difficulties that arise because of the nature of the embedding. Because of the central position in the information technology industry of object-oriented programs that access SQL-based relational database systems, reducing impedance mismatch is generally recognized in that industry as an important practical problem. We argue for the suitability of SQL as a database language, and hence for the desirability of keeping SQL as the view provided by a SQL embedding. We make the case that SQLJ, a SQL embedding for Java in which it appears that Java directly supports SQL commands, is the kind of SQL embedding that suffers the least impedance mismatch, when compared with call-level interfaces and object-relational mappings. We propose extensions to SQLJ that would reduce its impedance mismatch even further.
Show less - Date Issued
- 2012
- PURL
- http://purl.flvc.org/FAU/3355565
- Subject Headings
- Object-oriented programming (Computer science), SQL (Computer program language), Java (Computer program language), Relational databases
- Format
- Document (PDF)
- Title
- Regional differences in migratory activity by hatchling loggerhead sea turtles (Caretta caretta): effect of reciprocal nest translocations.
- Creator
- Guertin, Jeffrey, Charles E. Schmidt College of Science, Department of Biological Sciences
- Abstract/Description
-
There are four distinct subpopulations of loggerhead sea turtles (Caretta caretta) in Florida as determined behaviorally by geographic fidelity, and genetically by mitochondrial haplotypes. The South Florida subpopulation consists of females nesting on the southeastern and southwestern coasts of Florida and their offspring. Previous research shows that west coast hatchlings exhibit higher levels of nocturnal swimming during the postfrenzy period than east coast hatchlings. This study...
Show moreThere are four distinct subpopulations of loggerhead sea turtles (Caretta caretta) in Florida as determined behaviorally by geographic fidelity, and genetically by mitochondrial haplotypes. The South Florida subpopulation consists of females nesting on the southeastern and southwestern coasts of Florida and their offspring. Previous research shows that west coast hatchlings exhibit higher levels of nocturnal swimming during the postfrenzy period than east coast hatchlings. This study attempted to determine how these differences in migratory behavior develop. A reciprocal translocation experiment was conducted to distinguish between environmental and genetic factors. No consistent differences in hatchling swimming behavior were seen based on geography. Movement of nests resulted in lower levels of nocturnal swimming behavior in hatchlings compared to hatchlings that emerged from natural nests, suggesting that the relocation of nests may not provide a natural incubation environment for developing hatchlings.
Show less - Date Issued
- 2010
- PURL
- http://purl.flvc.org/FAU/1927867
- Subject Headings
- Predation (Biology), Sea turtles, Migration, Animal migration, Animal orientation
- Format
- Document (PDF)
- Title
- Origins, movements, and foraging behavior of Hawksbill Sea Turtles (Eretmochelys imbricata) in Palm Beach County waters, Florida, USA.
- Creator
- Wood, Lawrence D., Milton, Sarah L., Florida Atlantic University, Charles E. Schmidt College of Science, Department of Biological Sciences
- Abstract/Description
-
This dissertation examined the natal origins, home-range, and in-situ foraging behavior of an aggregation of sub-adult hawksbill turtles (Eretmochelys imbricata) found off the coast of Palm Beach County, Florida. Surveys were conducted on approximately 30 linear km of reef between 15 and 30 m in depth. Tissue samples were retrieved from 112 turtles for mtDNA haplotype determination. GPS-linked satellite transmitters were deployed on six resident sub-adults, resulting in both minimum convex...
Show moreThis dissertation examined the natal origins, home-range, and in-situ foraging behavior of an aggregation of sub-adult hawksbill turtles (Eretmochelys imbricata) found off the coast of Palm Beach County, Florida. Surveys were conducted on approximately 30 linear km of reef between 15 and 30 m in depth. Tissue samples were retrieved from 112 turtles for mtDNA haplotype determination. GPS-linked satellite transmitters were deployed on six resident sub-adults, resulting in both minimum convex polygon (MCP) and 95%, 50%, and 25% kernel density estimates (KDE) of home-range size. A foraging ethogram was developed, and sequential analysis performed on thirty videos (141 total minutes) of in-situ foraging behavior. Seventeen total haplotypes were identified in this aggregation, the majority (75%) of which represented rookeries on Mexico’s Yucatan Peninsula. Other sources, from most to least important, include Barbados, Costa Rica, Puerto Rico, Antigua, and the U.S. Virgin Islands.
Show less - Date Issued
- 2014
- PURL
- http://purl.flvc.org/fau/fd/FA00004339
- Subject Headings
- Animal behavior, Animal orientation, Hawksbill turtle -- Ecology, Predation (Biology), Sea turtles -- Habitat, Wildlife conservation, Wildlife management
- Format
- Document (PDF)
- Title
- Magnetic orientation of loggerhead sea turtle hatchlings: migratory strategies in the Gulf of Mexico.
- Creator
- Merrill, Maria W., Charles E. Schmidt College of Science, Department of Biological Sciences
- Abstract/Description
-
Loggerhead sea turtles nest on either the Atlantic or Gulf coast of Florida. The hatchlings from these nests migrate offshore in opposite directions. The purpose of my study was to determine if Gulf coast hatchlings use magnetic maps, as Atlantic coast hatchlings do, both to locate areas favorable for survival in the Gulf of Mexico and to orient appropriately within surface currents that could transport them into the Atlantic Ocean. To find out, I presented Gulf coast hatchlings with magnetic...
Show moreLoggerhead sea turtles nest on either the Atlantic or Gulf coast of Florida. The hatchlings from these nests migrate offshore in opposite directions. The purpose of my study was to determine if Gulf coast hatchlings use magnetic maps, as Atlantic coast hatchlings do, both to locate areas favorable for survival in the Gulf of Mexico and to orient appropriately within surface currents that could transport them into the Atlantic Ocean. To find out, I presented Gulf coast hatchlings with magnetic fields corresponding to different locations inside the Gulf, and within currents leading into (Florida Straits) and within (Gulf Stream) the western portion of the Atlantic Ocean. I conclude that Gulf coast hatchlings (i) use a high resolution magnetic map for navigation within the Gulf of Mexico, (ii) initially remain within the eastern Gulf, but later may (iii) gain entry into currents that transport them into Atlantic waters.
Show less - Date Issued
- 2010
- PURL
- http://purl.flvc.org/FAU/2138106
- Subject Headings
- Animal orientation, Magnetic fields, Sea turtles, Migration, Loggerhead turtle, Migration
- Format
- Document (PDF)
- Title
- Approaches to relational database access from object-oriented programming languages.
- Creator
- Ghouse, Murtuza., Florida Atlantic University, Solomon, Martin K.
- Abstract/Description
-
In this thesis, different methods to access relational databases from an object oriented programming language like Java have been investigated. The approaches that are covered are JDBC (Java Database Connectivity), SQLJ (industry standard for embedding SQL in Java) and Java Blend (product from Sun Microsystems, that provides object-oriented way to access data in a relational database). The emphasis is given to Java Blend, as it is a new tool with a very broad scope. And arguments in support...
Show moreIn this thesis, different methods to access relational databases from an object oriented programming language like Java have been investigated. The approaches that are covered are JDBC (Java Database Connectivity), SQLJ (industry standard for embedding SQL in Java) and Java Blend (product from Sun Microsystems, that provides object-oriented way to access data in a relational database). The emphasis is given to Java Blend, as it is a new tool with a very broad scope. And arguments in support of Java Blend as a better approach compared to JDBC and SQLJ are presented.
Show less - Date Issued
- 2001
- PURL
- http://purl.flvc.org/fcla/dt/12830
- Subject Headings
- Object-oriented programming (Computer science), Relational databases, Java (Computer program language)
- Format
- Document (PDF)
- Title
- Object-oriented process planning system for printed circuit boards fabrication (OOPP).
- Creator
- Alif, Nidal M., Florida Atlantic University, Han, Chingping (Jim)
- Abstract/Description
-
An Object-Oriented Process Planning (OOPP) system that generates a particular process plan for Printed Circuit Board (PCB) fabrication is developed. The OOPP is an integrated system that access the manufacturing database, which includes the fabrication processes and the main parameters of Printed Circuit Boards. An Object-Oriented approach has several benefits which include a modular system structure that combine procedures (programs) with data values, improving the communication among...
Show moreAn Object-Oriented Process Planning (OOPP) system that generates a particular process plan for Printed Circuit Board (PCB) fabrication is developed. The OOPP is an integrated system that access the manufacturing database, which includes the fabrication processes and the main parameters of Printed Circuit Boards. An Object-Oriented approach has several benefits which include a modular system structure that combine procedures (programs) with data values, improving the communication among different manufacturing activities, and achieving less system maintenance and down stream errors. OOPP system based on Group Technology (GT) concept and PCB fabrication rules. Applying Group Technology within Object Oriented process planning structure is a new application in this field. This gives more flexibility to the system and presents a technique that intends future reuse.
Show less - Date Issued
- 1991
- PURL
- http://purl.flvc.org/fcla/dt/14761
- Subject Headings
- Production planning--Data processing, Object-oriented programming (Computer science), Printed circuits
- Format
- Document (PDF)
- Title
- Object-oriented design of flexible manufacturing systems.
- Creator
- Abou-Haidar, Bassam., Florida Atlantic University, Fernandez, Eduardo B.
- Abstract/Description
-
This thesis presents a systematic method for the design and modeling of flexible manufacturing systems, using object-oriented concepts and Petri nets. In the method proposed, we first define the system components in terms of an object model consisting of hierarchical sets of classes and operations. Secondly, we model the dynamic aspects of the system using statecharts, including exceptions. As a third step, we derive Petri nets from those statecharts to realize the concurrency present in the...
Show moreThis thesis presents a systematic method for the design and modeling of flexible manufacturing systems, using object-oriented concepts and Petri nets. In the method proposed, we first define the system components in terms of an object model consisting of hierarchical sets of classes and operations. Secondly, we model the dynamic aspects of the system using statecharts, including exceptions. As a third step, we derive Petri nets from those statecharts to realize the concurrency present in the system. Finally we develop a hierarchy of controllers, corresponding to the layers of the object model, for the independent components of the system based on the Petri nets obtained in the previous step.
Show less - Date Issued
- 1993
- PURL
- http://purl.flvc.org/fcla/dt/14989
- Subject Headings
- Petri nets, Flexible manufacturing systems, Object-oriented programming (Computer science), Real-time control
- Format
- Document (PDF)
- Title
- An authorization model for object-oriented and semantic databases.
- Creator
- Song, Haiyan., Florida Atlantic University, Fernandez, Eduardo B., College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
- Abstract/Description
-
The incorporation of object-oriented and semantic modeling concepts to databases is one of the most significant advances in the evolution of database systems. Among the many issues brought along by this integration, one that becomes important is the protection of the information. This thesis presents an authorization model that applies two basic aspects: control of users' access to data values, and control of administrators' access to data definitions and authorization rules. The model...
Show moreThe incorporation of object-oriented and semantic modeling concepts to databases is one of the most significant advances in the evolution of database systems. Among the many issues brought along by this integration, one that becomes important is the protection of the information. This thesis presents an authorization model that applies two basic aspects: control of users' access to data values, and control of administrators' access to data definitions and authorization rules. The model consists of a set of policies, a structure for authorization rules, algorithms for access request validation and procedures for administrative functions. Even though this model is developed in the context of a particular data model, the discussion is sufficiently general and can be applied to similar environments.
Show less - Date Issued
- 1990
- PURL
- http://purl.flvc.org/fcla/dt/14592
- Subject Headings
- Object-oriented databases, Data base security, Computers--Access control
- Format
- Document (PDF)
- Title
- A heterogeneous multiprocessor architecture for workstations.
- Creator
- Bealkowski, Richard., Florida Atlantic University, Fernandez, Eduardo B., College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
- Abstract/Description
-
Providing multiprocessor capability to the class of computers commonly referred to as personal workstations is the next evolutionary step in their development. Uniprocessor workstations limit the user in throughput, reliability, functionality, and architecture. Multiprocessor workstations have the potential of increasing system throughput. A multiprocessor system with expanded architecture derived from a set of heterogeneous processors gives the user a diverse application base within a single...
Show moreProviding multiprocessor capability to the class of computers commonly referred to as personal workstations is the next evolutionary step in their development. Uniprocessor workstations limit the user in throughput, reliability, functionality, and architecture. Multiprocessor workstations have the potential of increasing system throughput. A multiprocessor system with expanded architecture derived from a set of heterogeneous processors gives the user a diverse application base within a single system. The replication and diversity offered in systems of this design, when coupled with fault-tolerant design techniques, enhances system reliability. A heterogeneous multiprocessor architecture is presented which combines loosely- and tightly-coupled configurations (multicomputer and multiprocessor). This architecture provides for incremental growth of the system, either by static or dynamic reconfiguration. The software view of the system is that of an object-oriented environment. The object-oriented approach is used to unify the heterogeneous nature of the system. The process is the unit of concurrency in the system and cooperating concurrent processes are supported. A set of system primitives are provided to support the requirements of a heterogeneous multiprocessing environment. A virtual machine layer controls the distribution of processes and allocation of resources in the system. A virtual network is used to provide communication paths and resource sharing. The virtual network is designed to be bridged to an external physical network. The system requirements for a secure and reliable operating environment are incorporated into the design. This system utilizes "hardware porting" as a means to overcome the lag of software support for hardware advances. Rather than software port an entire application base to a new system architecture, hardware porting brings the required instruction set architecture to the applications. This heterogeneous multiprocessor architecture builds on a popular system architecture, the scIBM PS/2 with the Micro Channel system bus. Incorporating a second bus, the scSCSI bus, as a system extension is explored.
Show less - Date Issued
- 1989
- PURL
- http://purl.flvc.org/fcla/dt/12242
- Subject Headings
- Microcomputer workstations, Multiprocessors, Object-oriented programming (Computer science), Computer architecture
- Format
- Document (PDF)
- Title
- A framework for an icon-based software engineering environment.
- Creator
- Huang, Qinxi., Florida Atlantic University, Larrondo-Petrie, Maria M.
- Abstract/Description
-
Current computer technologies and demands bring new challenges to the software engineering tools. This thesis includes a survey of software engineering environments, standards and technologies. It also examines the features needed to support rigorous object-oriented software development. The main contributions of the thesis are descriptions of innovative concepts and a high-level framework for a next-generation object-oriented software system development, management and maintenance...
Show moreCurrent computer technologies and demands bring new challenges to the software engineering tools. This thesis includes a survey of software engineering environments, standards and technologies. It also examines the features needed to support rigorous object-oriented software development. The main contributions of the thesis are descriptions of innovative concepts and a high-level framework for a next-generation object-oriented software system development, management and maintenance environment, called IconSEE++, an Icon-based Software Engineering Environment.
Show less - Date Issued
- 1998
- PURL
- http://purl.flvc.org/fcla/dt/15576
- Subject Headings
- Software engineering, Object-oriented methods (Computer science), Icon (Computer program language)
- Format
- Document (PDF)
- Title
- An object-oriented model for a manufacturing resource planning system.
- Creator
- Kastritis, Karen Mary., Florida Atlantic University, Han, Chingping (Jim), Fernandez, Eduardo B., College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
- Abstract/Description
-
Manufacturing Resource Planning systems are functionally complex systems. In providing effective resource management tools, they support the integration of a wide variety of complex functions. These systems also undergo frequent changes as business needs change. For these reasons, analysis techniques which provide methods to create clear, flexible systems must be sought. Object oriented analysis is such a technique. This thesis presents the development of an object oriented model for a...
Show moreManufacturing Resource Planning systems are functionally complex systems. In providing effective resource management tools, they support the integration of a wide variety of complex functions. These systems also undergo frequent changes as business needs change. For these reasons, analysis techniques which provide methods to create clear, flexible systems must be sought. Object oriented analysis is such a technique. This thesis presents the development of an object oriented model for a Manufacturing Resource Planning system (MRPII). It will be shown that the use of objects and object oriented techniques to model complex systems such as MRPII results in system models which are more easily understood and more flexible to change than other more conventional representations. Future research may include the formal design and implementation of the model. The flexibility of the implemented system could then be compared to the level of flexibility of a non-object based system.
Show less - Date Issued
- 1996
- PURL
- http://purl.flvc.org/fcla/dt/15288
- Subject Headings
- Manufacturing processes, Manufacturing resource planning, Production management--Data processing, Object-oriented programming (Computer science)
- Format
- Document (PDF)
- Title
- Extensions to real-time object-oriented software design methodologies.
- Creator
- Woodcock, Timothy G., Florida Atlantic University, Fernandez, Eduardo B., College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
- Abstract/Description
-
Real-time systems are systems where time is considered a system resource that needs to be managed. Time is usually represented in these systems as a deadline to complete a task. Unfortunately, by adding timing to even simple algorithms, it complicates them greatly. Real-time systems are by nature difficult and complex to understand. Object-oriented methodologies have attributes that allow real-time systems to be designed and implemented with less error and some control over the resultant...
Show moreReal-time systems are systems where time is considered a system resource that needs to be managed. Time is usually represented in these systems as a deadline to complete a task. Unfortunately, by adding timing to even simple algorithms, it complicates them greatly. Real-time systems are by nature difficult and complex to understand. Object-oriented methodologies have attributes that allow real-time systems to be designed and implemented with less error and some control over the resultant complexity. With object-oriented design, the system is modeled in the environment that it will be used in. Objects themselves, are partitions of the system, into logical, understandable units. In this dissertation, we start by surveying the current real-time object-oriented design methodologies. By comparing these methodologies and developing a set of criteria for evaluating them, we discover that certain aspects of these methodologies still need some work. The most important aspects of the methodologies are understanding the effects of deadlines on statechart behavioral models and understanding the effects of deadlines when object models are inherited or undergo aggregation. The effects of deadlines on statecharts are then explored in detail. There are two basic ways that deadlines are added to statecharts. The first, and most popular, is adding timing as a condition on a state transition. The second is adding a count down timer to a state and forcing a transition if the timer reaches zero. We show that these are equivalent and can be used interchangeably to simplify designs. Next, the effects of deadlines on behavior models when the corresponding object models undergo inheritance or aggregation are studied. We will first analyze the effects on the behavior model when object inheritance is encountered. We found eight ways that the behavior model can be modified and still maintain the properties of inheritance. Finally, deadlines are added and the analysis is repeated.
Show less - Date Issued
- 1996
- PURL
- http://purl.flvc.org/fcla/dt/12493
- Subject Headings
- Real-time data processing, Computer software--Development, Object-oriented programming (Computer science)
- Format
- Document (PDF)
- Title
- Extending use cases and interaction diagrams to develop distributed system architecture requirements.
- Creator
- Hawkins, John C., Florida Atlantic University, Fernandez, Eduardo B.
- Abstract/Description
-
Current object-oriented development methodologies do not introduce distributed system architectural aspects early enough in the system development cycle. A development partitioning scheme that includes the system level, in addition to the problem and application levels, will encourage analysis that includes elicitation of non-functional system requirements. These requirements include response time with respect to system communication load, fault tolerance, safety, security, and real-time...
Show moreCurrent object-oriented development methodologies do not introduce distributed system architectural aspects early enough in the system development cycle. A development partitioning scheme that includes the system level, in addition to the problem and application levels, will encourage analysis that includes elicitation of non-functional system requirements. These requirements include response time with respect to system communication load, fault tolerance, safety, security, and real-time deadlines, among others. They can be documented with an extended form of Jacobson's use cases. Where use cases describe how a system will work from a user's point of view, extended use cases add the capability to describe how well it should work. System level analysis information can be graphically depicted on extended forms of Unified Modeling Language (UML) interaction diagrams and on multilevel architecture diagrams.
Show less - Date Issued
- 1997
- PURL
- http://purl.flvc.org/fcla/dt/15406
- Subject Headings
- Object-oriented methods (Computer science), UML (Computer science), Electronic data processing--Distributed processing
- Format
- Document (PDF)
- Title
- Migratory Behavior of Hatchling Sea Turtles: Evidence for Population-Specific Divergence in the Loggerhead (Caretta caretta L.).
- Creator
- Madrak, Sheila Veronica, Salmon, Michael, Florida Atlantic University
- Abstract/Description
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Migratory bird and insect populations show differences in orientation direction, timing, and distances moved depending upon where they reside in relation to their migratory goals. These differences presumably occur because of selection for behavioral responses that promote the most efficient migratory strategies among members of each population. The purpose of this study was to determine whether migratory behavior in loggerhead hatchlings differs between populations that exit nesting beaches...
Show moreMigratory bird and insect populations show differences in orientation direction, timing, and distances moved depending upon where they reside in relation to their migratory goals. These differences presumably occur because of selection for behavioral responses that promote the most efficient migratory strategies among members of each population. The purpose of this study was to determine whether migratory behavior in loggerhead hatchlings differs between populations that exit nesting beaches on the East and West coast of Florida. When the turtles emerge from the nests, they initially show a swimming "frenzy" that serves to distance individuals from shallow coastal waters, displacing them toward oceanic currents that are used to transport the turtles to the North Atlantic Gyre. On the East coast of Florida, turtles swim eastward toward the Florida Current (western portion of the Gulf Stream) located relatively close to the shoreline (on average, 2 km offshore at Miami to 33 km offshore at Melbourne Beach). On the West coast of Florida, turtles swim westward toward the Loop Current in the Gulf of Mexico, which is located farther offshore (150 km offshore at St. Petersburg to over 200 km offshore at the Everglades National Park). In a previous study, we demonstrated that for East coast loggerheads, the frenzy consists of continuous swimming for - 24 h, followed over the next 5 days by postfrenzy (diurnal, with little nocturnal) swimming activity. No comparable data exist that characterize the frenzy period of loggerheads from the West coast ofFlorida. We used identical methods to quantify the migratory activity of hatchlings from the West coast of Florida. Hatchlings were captured as they emerged from nests located between Venice and Sarasota, Florida. They were then tethered in water-filled pools under laboratory conditions, where temperature and photoperiod could be controlled to duplicate conditions used when studying the East coast turtles. Activity was continuously recorded over the next six days. The data were analyzed to determine the proportion of time the turtles spent swimming every day, and the proportion of that swimming activity that occurred during the light and dark period of each day. Turtl~s from each coast showed no statistical difference in the proportion oftime spent swimming each day. However, after day 1, West coast hatchlings showed statistically lower levels of swimming activity during the day and statistically higher levels of swimming activity at night than did turtles from the East coast. We hypothesize that these differences may reflect a more diffuse period of active "searching" for appropriate oceanic currents by the West coast turtles, under conditions where greater predation pressures might select for more movement under conditions of darkness. Such a response may be appropriate when migratory goals are located at greater distances, and when turtles must migrate farther from the coast to reach deeper, and presumably less predator-rich, waters.
Show less - Date Issued
- 2007
- PURL
- http://purl.flvc.org/fau/fd/FA00000792
- Subject Headings
- Animal migration--Florida, Sea turtles--Migration--Florida, Predation (Biology), Animal orientation--Florida
- Format
- Document (PDF)
