Digital Commons Network^™

Force Measurements On A Flapping And Pitching Wing At Low Reynolds Numbers, Kakkattukuzhy M. Isaac, Anthony Colozza, Jessica Rolwes

Mechanical and Aerospace Engineering Faculty Research & Creative Works

Force measurements from experiments conducted in water on a flapping-and-pitching thin flat plate wing of semi-elliptic planform at low Reynolds numbers are reported. Time varying force data, measured using a force transducer, provide a means to understand the mechanisms that lead to enhanced performance observed in insect flight compared to fixed wing aerodynamics. Experimental uncertainties associated with low level (∼1N) fluid dynamic force measurements on flapping-and-pitching wings are addressed. a previously proposed pitching mode in which the leading edge and trailing edge switch roles to allow using cambered airfoils has been shown to be viable and may have advantages over …

Nonlinear Control Concepts For A Ua, Vijayakumar Janardhan, Derek Schmitz, S. N. Balakrishnan

Mechanical and Aerospace Engineering Faculty Research & Creative Works

A reconfigurable flight control method is developed to be implemented on an Unmanned Aircraft (UA), a thirty percent scale model of the Cessna 150. This paper presents the details of the UA platform, system identification, reconfigurable controller design, development, and implementation on the UA to analyze the performance metrics. A Crossbow Inertial Measurement Unit provides the roll, pitch, and yaw accelerations and rates along with the roll and pitch. The 100-400 mini-air data boom from SpaceAge Control provides the airspeed, altitude, angle of attack, and the side slip angles. System identification is accomplished by commanding preprogrammed inputs to the control …

Neural Network Control Of Spark Ignition Engines With High Egr Levels, A. Singh, Brian C. Kaul, J. A. Drallmeier, Jagannathan Sarangapani, Jonathan B. Vance

Mechanical and Aerospace Engineering Faculty Research & Creative Works

Research has shown substantial reductions in the oxides of nitrogen (NOx) concentrations by using 10% to 25% exhaust gas recirculation (EGR) in spark ignition (SI) engines [1]. However under high EGR levels the engine exhibits strong cyclic dispersion in heat release which may lead to instability and unsatisfactory performance. A suite of neural network (NN)-based output feedback controllers with and without reinforcement learning is developed to control the SI engine at high levels of EGR even when the engine dynamics are unknown by using fuel as the control input. A separate control loop was designed for controlling EGR levels. The …

Hermeneutics, Gerry White

Syllabus Repository

No abstract provided.

Biblical Exposition And Faith Integration, Robby Waddell Dr.

Syllabus Repository

No abstract provided.

New Testament Survey, Robby Waddell Dr.

Syllabus Repository

No abstract provided.

Life Of Christ And Acts, Robby Waddell Dr.

Syllabus Repository

No abstract provided.

National Board For Professional Teaching Standards Certification: Does It Impact Student Learning?, Patricia E. Falaney

UNF Graduate Theses and Dissertations

The present study measured student gains in learning using the Florida Comprehensive Assessment Test pre and post-test mean scale scores in reading comprehension and math problem solving. The project involved classes of students in fourth and fifth grade in six north Florida counties. Thirty class sets of students were taught by a National Board Certified teacher, and a comparable set of thirty class sets of students of the same grade level and at the same school were taught by a teacher who was not National Board Certified. The analysis indicated if National Board Certified teachers produced a higher mean gain …

Approximate String Matching With Dynamic Programming And Suffix Trees, Leng Hui Keng

UNF Graduate Theses and Dissertations

The importance and the contribution of string matching algorithms to the modern society cannot be overstated. From basic search algorithms such as spell checking and data querying, to advanced algorithms such as DNA sequencing, trend analysis and signal processing, string matching algorithms form the foundation of many aspects in computing that have been pivotal in technological advancement.

In general, string matching algorithms can be divided into the categories of exact string matching and approximate string matching. We study each area and examine some of the well known algorithms. We probe into one of the most intriguing data structure in string …

P2pcompute - A Peer-To-Peer Computing Model, Jayant Mishra

UNF Graduate Theses and Dissertations

Peer-to-peer (P2P) networks consist of nodes which have both client and server capabilities and on which communication and data sharing is carried on directly between nodes, rather than being arbitrated by an intermediary node. The P2P architecture was popularized by file-sharing, one of the widely-used applications of the Internet. Many applications that are based on this architecture have been developed. It also provides an efficient platform to harness the computing power of a network of desktop computers. P2P computing power can help solve computationally complex problems that require powerful supercomputers. However, it has not been as widely used as the …

A Comparative Analysis Of Public Postsecondary Workforce Education Institutions In Florida, Georgia, And Kentucky, Christine Cothron

UNF Graduate Theses and Dissertations

This research was a descriptive cross-site case study of organizational structures of public workforce education institutions in the states of Florida, Georgia, and Kentucky. Organizational structures in public workforce education institutions can be found in four basic designs: technical centers, technical colleges, community colleges, and community and technical colleges. The purpose of this study was to investigate the concept of organizational structure in terms of the operation and effectiveness of workforce education institutions by studying four workforce institutions operating under differing arrangements.

This study investigated the following research questions:
1. Does organizational structure influence specific outcome factors for and between …

On The Performance Evaluation Of High-Speed Transport Protocols, Bridget Hillyer

UNF Graduate Theses and Dissertations

As high-speed networks with large bandwidth delay products (BDP) become more common, high-speed transport protocols must be developed that perform well in these contexts. TCP has limitations in high BDP networks. A number of high-speed TCP proposals have emerged, including BIC TCP, High Speed TCP, and H-TCP. XCP is an intraprotocol communication mechanism that promises even greater performance by providing explicit feedback from routers about congestion. It requires changes to routers and end hosts, though, whereas the other experimental protocols only require changes to an end host. We evaluated the performance ofXCP against BIC TCP, High Speed TCP, H-TCP, and …

Revelation, Robby Waddell Dr.

Syllabus Repository

No abstract provided.

Microbiology, Steelman Library, B Mcconchie Dr.

Syllabus Repository

No abstract provided.

Old Testament Survey, Steelman Library, G White

Syllabus Repository

No abstract provided.

Old Testament History, Steelman Library, Gerry White

Syllabus Repository

No abstract provided.