Digital Commons Network^™

A Hierarchical Channel Selection Scheme For Macro/Micro Cellular Networks, Ayesha Zaheer

Retrospective Theses and Dissertations

Hierarchical channel allocation schemes for cellular networks offer a promising approach to solve the pressing problem of increasing the cellular servicing capacity in spite of the limited radio spectrum available. We propose a hierarchical channel selection scheme for handling handoffs and new calls in micro/macro cellular systems. The scheme is intended to improve the performance and quality of service of these systems by increasing the cell channel utilization, reducing the handoff blocking probability and improving the responsive to new calls.

The proposed scheme is based on several design enhancements including an overflow buffer, which is used for handoff calls that …

Optical Performance Of Grazing Incidence X-Ray / Euv Telescopes For Space Science Applications, Patrick Louis Thompson

Retrospective Theses and Dissertations

The science and technology of X-rays has only been part of human achievement for the past 100 years, while the study of image formation in general has endured for as long as 1000 years. The ability to conceive, design, and fabricate X-ray imagers, moreover, has existed for only the past 70 years, and X-ray astronomical telescopes have been in use for a mere 35 years. Considering that aplanatic, normal incidence telescope designs required more than 400 years to perfect, it is most interesting to note that the development of ‘aplanatic’ grazing incidence telescopes has taken only about 40 years. In …

Efficient Techniques For Management And Delivery Of Video Data, Junghwan Oh

Retrospective Theses and Dissertations

The rapid advances in electronic imaging, storage, data compression telecommunications, and networking technology have resulted in a vast creation and use of digital videos in many important applications such as digital libraries, distance learning, public information systems, electronic commerce, movie on demand, etc. This brings about the need for management as well as delivery of video data. Organizing and managing video data, however, is much more complex than managing conventional text data due to their semantically rich and unstructured contents. Also, the enormous size of video files requires high communication bandwidth for data delivery. In this dissertation, I present the …

University Of Central Florida Ir 3 Year Fact Book - Ay 1997-1998 Through 1999-2000, University Of Central Florida

Historical Fact Book and Enrollment

Historical fact book and enrollment data for the University of Central Florida.

Virtual Environment Software System: Mathematics Library, Bryan Kline, Jason Daly, Glenn A. Martin

Institute for Simulation and Training

Report describes the typical usage of the virtual environment software system mathematics library as well as the internal operations of many of the routines contained within.

View-Centric Reasoning About Parallel And Distributed Computation, Marc L. Smith

Retrospective Theses and Dissertations

The development of distributed applications has not progressed as rapidly as its enabling technologies. In part, this is due to the difficulty of reasoning about such complex systems. In contrast to sequential systems, parallel systems give rise to parallel events, and the resulting uncertainty of the observed order of these events. Loosely coupled distributed systems complicate this even further by introducing the element of multiple imperfect observers of these parallel events. The goal of this dissertation is to advance parallel and distributed systems development by producing a parameterized model that can be instantiated to reflect the computation and coordination properties …

Adolph Fick: Mathematician, Physicist, Physiologist, Louis J. Acierno

Faculty Bibliography 2000s

No abstract provided.

Automatic Modeling Of Knee-Joint Motion For The Virtual Reality Dynamic Anatomy (Vrda) Tool, Yohan Baillot, Jannick P. Rolland, Kuo-Chi Lin, Donna L. Wright

Faculty Bibliography 2000s

This paper presents a method and algorithms for automatic modeling of anatomical joint motion. The method relies on collision detection to achieve stable positions and orientations of the knee joint by evaluating the relative motion of the tibia with respect to the femur (for example, flexion-extension). The stable positions then become the basis for a look-up table employed in the animation of the joint. The strength of this method lies in its robustness to animate any normal anatomical joint. It is also expandable to other anatomical joints given a set of kinematic constraints for the joint type as well as …

Demand Reduction In Multiunit Auctions: Evidence From A Sportscard Field Experiment, John A. List, David Lucking-Reiley

Faculty Bibliography 2000s

No abstract provided.

Duration And Exposure To Virtual Environments: Sickness Curves During And Across Sessions, Robert S. Kennedy, Kay M. Stanney, William P. Dunlap

Faculty Bibliography 2000s

Although simulator sickness is known to increase with protracted exposure and to diminish with repeated sessions, limited systematic research has been performed in these areas. This study reviewed the few studies with sufficient information available to determine the effect-that exposure duration and repeated exposure have on motion sickness. This evaluation confirmed that longer exposures produce more symptoms and that total sickness subsides over repeated exposures. Additional evaluation was performed to investigate the precise form of this relationship and to determine whether the same form was generalizable across varied simulator environments. The results indicated that exposure duration and repeated exposures are …

Evidence Of Scattering Anisotropy Effects On Boundary Conditions Of The Diffusion Equation, G. Popescu, C. Mujat, A. Dogariu

Faculty Bibliography 2000s

We present experimental evidence that the diffusion process close to the boundary is fundamentally different from the bulk diffusion in the sense that it is affected by the scattering properties of the individual centers. Systematic measurements show a nontrivial behavior of the extrapolation length ratio on the scattering anisotropy of individual particles. The results are compared with other works and are supported by an independent Monte Carlo simulation. A simple analytical model that emphasizes the influence of the last scattering event successfully describes the results.

Fast Algorithms For Histogram Matching: Application To Texture Synthesis, J. P. Rolland, V. Vo, B. Bloss, C. K. Abbey

Faculty Bibliography 2000s

Texture synthesis is the ability to create ensembles of images of similar structures from sample textures that have been photographed. The method we employ for texture synthesis is based on histogram matching of images at multiple scales and orientations. This paper reports two fast and in one case simple algorithms for histogram matching We show that the sort-matching and the optimal cumulative distribution function (CDF)-matching (OCM) algorithms provide high computational speed compared to that provided by the conventional approach. The sort-matching algorithm also provides exact histogram matching. Results of texture synthesis using either method show no subjective perceptual differences. The …

Systems Engineering Analysis Of Aplanatic Wolter Type I X-Ray Telescopes, Patrick L. Thompson, James E. Harvey

Faculty Bibliography 2000s

It is well known that normal-incidence aplanatic telescope designs perform better at small field angles than ones corrected only for spherical aberration. This is why most large astronomical telescopes fabricated in the past fifty years have been of the Ritchey-Chretien (aplanatic) design rather than of the classical Cassegrain design. For the relatively new field of x-ray astronomy, the Welter type I grazing incidence design has been extensively utilized. It consists of a paraboloidal primary mirror coaxial with a confocal hyperboloidal secondary mirror. Aplanatic versions of the Welter type I grazing incidence x-ray telescope have been discussed in detail in the …

Clutter Modeling In Infrared Images Using Genetic Programming, Liviu I. Voicu, Mosleh Uddin, Harley R. Myler, Anthony Gallagher, Julien Schuler

Faculty Bibliography 2000s

Background clutter characterization in infrared imagery has become an actively researched field, and several clutter models have been reported. These models attempt to evaluate the target detection and recognition probabilities that are characteristic of a certain scene when specific target and human visual perception features are known. The prior knowledge assumed and required by these models is a severe limitation. Furthermore, the attempt to model subjective and intricate mechanisms such as human perception with general mathematical formulas is controversial, in this paper, we introduce the idea of adaptive models that are dynamically derived from a set of examples by a …

A Multivariate Approach To The Dynamic Of Violence Within Intimate Relationships: An Application Of Theory Of Coercive Power In Exchange, Giovanna Gianesini

Retrospective Theses and Dissertations

This study, drawing from theories of structural power and exchange, verified the hypotheses that the mechanisms, dynamics, and direction of violence in intimate relationships depends on the resources of each partner, the ratio of such resources, and their summative effects. Specifically, this study developed a framework that integrates the factors found related to domestic violence and defined as resources, and took into account their reward power, with reference to the status quo of the partners, to determine each partner's power within the relationship. The resources considered have included variables from four domains, individual, relational, social structural, and sociocultural. Existing gender-based …

Why Communication Is Important: A Rationale For The Centrality Of The Study Of Communication, Sherwyn P. Morreale, Michael M. Osborn, Judy C. Pearson

Journal of the Association for Communication Administration

This article defends the importance of studying communication. Academic disciplines in higher education are routinely called upon to explain and justify their role in the educational enterprise. Some academic fields such as history and philosophy are more central in the pursuits of liberal arts, while others such as business administration and engineering are more related to career development. The discipline of communication is fairly unique as it crosses these boundaries. As a result, a need exists to provide a rationale for the study of communication. The National Communication Association, in response to requests from communication departments and administrators for evidence …

Relationships Among Central Administrators, Chairs, And Faculty: Academic Change Agents In Theory And Practice, Mark Hickson Iii

Journal of the Association for Communication Administration

This article explores the impact of the academic changes in the higher education in the U.S. on the relationship among administrators, chairs and faculty. Times have changed in higher education in the U.S. In the 1960s and 1970s higher education grew rapidly. State and local governments, as well as private donors, willingly and enthusiastically supported higher education. But the Vietnam conflict brought changes in that colleges were often considered the training grounds for protesters as well as escape routes from military conscription. Today it appears that most of heard are requests for raising money not at the president's level nor …

Scintillation Model For A Satellite Communication Link At Large Zenith Angles, Larry C. Andrews, Ronald L. Phillips, Cynthia Young Hopen

Faculty Bibliography 2000s

A scintillation model is developed for uplink-downlink optical communication channels applicable in moderate to strong fluctuation conditions that may arise under large zenith angles between transmitter and receiver. The model developed here is an extension of a recently published theory that treats irradiance fluctuations along a horizontal path as a modulation of small-scale scintillation by large-scale scintillation. For a downlink path the scintillation index is modeled like that of an infinite plane wave, and for an uplink path we consider a spherical wave model. In both cases the scintillation index agrees with conventional weak-fluctuation-theory results out to zenith angles of …

University Of Central Florida Commencement, December 18, 1999, University Of Central Florida

Commencement Programs

No abstract provided.

The Ucf Report, Vol. 22 No. 11, December 17, 1999, University Of Central Florida

The UCF Report

Last class of 1990s graduates this month: Four commencement ceremonies will be held on Dec. 18 for nearly 2,400 grads; Nobel winners: Time for peace: Desmond Tutu and Oscar Arias talked of God, need for more generosity at forum; 1999 a memorable year for university: A glance back at the past 12 months show that UCF took several more steps in its quest to become a great university.

Central Florida Future, December 8, 1999

Central Florida Future

Patton reinstated; SG in confusion; Seniors prepare for Graduation; No relief from parking headaches until fall 2000.

Sandspur, Vol 106 No 11, December 3, 1999, Rollins College

The Rollins Sandspur

Rollins College student newspaper, written by the students and published at Rollins College. The Sandspur started as a literary journal.

Sandspur, Vol 106 No 10, November 19, 1999, Rollins College

The Rollins Sandspur

Rollins College student newspaper, written by the students and published at Rollins College. The Sandspur started as a literary journal.

Supervisory Control And Data Acquisition Experiment Using The Advanced Communications Technology Satellite, Florida Solar Energy Center, Carol Emrich

FSEC Energy Research Center®

Satellite Supervisory Control and Data Acquisition (SCADA) was tested using the Advanced Communication Technology Satellite (ACTS) Ka-band signal and Ultra Small Aperture Terminal (USAT) ground stations. The SCADA system included a photovoltaic (PV)/diesel hybrid power generator designed to provide electricity to a rural community in a developing country. End-to-end baseline hardware checkout experiments have been completed. Results show that continuous two-second data transfers for real time monitoring can be completed with an error rate of less than 1%. The system recovers from simulated perturbations quickly and gracefully. Specifically, normal operation is resumed within 36 seconds following loss of power to …

The Ucf Report, Vol. 22 No. 3, August 27, 1999, University Of Central Florida

The UCF Report

Enrollment could approach 32,000: More students than ever are ate tending UCF this semester, and enrollment is expected to grow to 48,000 by 2010; Athletics complex is field of dreams: Build stadiums and a bigger arena, and major conference, more fans will come; Sharp student receives UCF's 100,000th degree: Chris Sharp's college career began on a dare; now, he has a master's degree.

University Of Central Florida Commencement, August 7, 1999, University Of Central Florida

Commencement Programs

No abstract provided.

The Ucf Report, Vol. 22 No. 1, July 16, 1999, University Of Central Florida

The UCF Report

3-D models cure confusion for doctors: engineering professor Yasser Hosni has developed a method to show doctors exactly what is ailing patients; Forensic Center puzzle complete: World leader in field of forensic science is the new director for UCF's national center; Mapping out ways to figure out crime: UCF is helping police agencies figure out when and where crimes occur.

Central Florida Future, June 9, 1999

Central Florida Future

More Senate hearings planned later this week; Cash in the wink of an eye; Skills learned while playing video games.

University Of Central Florida Commencement, May 8, 1999, University Of Central Florida

Commencement Programs

No abstract provided.

University Of Central Florida Undergraduate Catalog, 1999 - 2000, University Of Central Florida

UCF Catalogs

No abstract provided.