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- Title
- AIRPORT SECURITY: EXAMINING THE CURRENT STATE OF ACCEPTANCE OF BIOMETRICS AND THE PROPENSITY OF ADOPTING BIOMETRIC TECHNOLOGY FOR AIRPORT ACCESS CONTROL.
- Creator
-
Sumner, Kristine, Liberman, Aaron, University of Central Florida
- Abstract / Description
-
The terrorist attacks of September 11, 2001 propelled the issue of aviation security to the forefront of the U.S. domestic agenda. Although hundreds of individual airports exist in the U.S., the travel activities at each of these airports combine to holistically comprise an aviation system that represents a significant portion of the U.S. social and economic infrastructure. Disruption at one airport resulting from a criminal act, such as terrorism, could exert detrimental effects upon the...
Show moreThe terrorist attacks of September 11, 2001 propelled the issue of aviation security to the forefront of the U.S. domestic agenda. Although hundreds of individual airports exist in the U.S., the travel activities at each of these airports combine to holistically comprise an aviation system that represents a significant portion of the U.S. social and economic infrastructure. Disruption at one airport resulting from a criminal act, such as terrorism, could exert detrimental effects upon the aviation system and U.S national security (9/11 Commission, 2004). Each U.S. airport is individually responsible for various aspects of security including the control of physical access to sensitive and secure areas and facilities (9/11 Commission, 2004). Biometric technology has been examined as one method of enhancing airport access control to mitigate the possibility of criminal acts against airports. However, successful implementation of biometric technology depends largely on how individual security directors at each airport perceive, understand, and accept that technology. Backgrounds, attitudes, and personal characteristics influence individual decisions about technology implementation (Rogers, 1995; Tornatzky and Fleischer, 1990). This study examines the problem of airport access control, as well as, the current trends in biometric technology. Utilizing a survey of airport security directors and security managers, this study draws upon innovation diffusion theory and organizational theories to determine what personal, organizational, and technical variables contribute to the propensity of airport security directors and managers to adopt biometric technology for airport access control.
Show less - Date Issued
- 2007
- Identifier
- CFE0001693, ucf:47220
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0001693
- Title
- DESIGN IMPLEMENTATION OF A MICROCONTROLLER BASED EXTERNAL FACILITY ACCESS CONTROL SYSTEM.
- Creator
-
Fulbright Jr., Thomas, Richie, Samuel, University of Central Florida
- Abstract / Description
-
In order to solve the College of Engineering and Computer Science facility access problem, an automated system that provides exterior doors with a time schedule and allows authorized users to gain access to the facility after hours was developed. A microcontroller based system has been designed to interface with a personal computer. The system designed within this thesis can be used as a starting point for multiple facility access control systems. This thesis will describe the design,...
Show moreIn order to solve the College of Engineering and Computer Science facility access problem, an automated system that provides exterior doors with a time schedule and allows authorized users to gain access to the facility after hours was developed. A microcontroller based system has been designed to interface with a personal computer. The system designed within this thesis can be used as a starting point for multiple facility access control systems. This thesis will describe the design, integration, test, and final delivery of a facility access system that incorporates the Texas Instruments MSP430 microcontroller, a magnetic card swipe reader, and software developed in Microsoft Visual Basic .Net to provide a reliable and robust system for the College of Engineering and Computers Sciences needs.
Show less - Date Issued
- 2005
- Identifier
- CFE0000484, ucf:52897
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0000484
- Title
- The Spatial Distribution of Tumuli in the Iron Age Kanak Su Basin, Turkey.
- Creator
-
Paulsen, Paige, Branting, Scott, Walker, John, Williams, Lana, University of Central Florida
- Abstract / Description
-
This project takes the Iron Age tumuli of the Kanak Su Basin in Yozgat, Turkey as a case study for the application of geospatial methods to reconstruct past perceptions of a mortuary landscape. The tumulus fields (-) landscapes heavily modified by monumental burial mounds (-) of central Anatolia present an opportunity to investigate how burial practices reflect and create places of collective memory, territorial identity, and the social order. Understanding the nature of Iron Age settlement...
Show moreThis project takes the Iron Age tumuli of the Kanak Su Basin in Yozgat, Turkey as a case study for the application of geospatial methods to reconstruct past perceptions of a mortuary landscape. The tumulus fields (-) landscapes heavily modified by monumental burial mounds (-) of central Anatolia present an opportunity to investigate how burial practices reflect and create places of collective memory, territorial identity, and the social order. Understanding the nature of Iron Age settlement in the Kanak Su Basin remains an ongoing subject of study in central Anatolian archaeology, especially in regard to how the large, short-lived city of Kerkenes interacted with the existing long-term settlement history in the basin. This project seeks to understand the role of the tumuli in this landscape by investigating the relationship between the settlement pattern and the burial mounds along axes of proximity, visibility, and accessibility using spatial statistics, viewsheds, and least cost pathways. The spatial distribution of mounds suggests which sites might have participated in constructing tumuli and the possible motivating factors in their location. Larger sites in the study area appear to have participated more frequently in tumulus construction. This analysis also allows us to reconstruct the more general experience of living among the mounds, whether one participated in the practice or not, and results suggest the tumuli were located to increase the number of people who perceived and interacted with them.
Show less - Date Issued
- 2018
- Identifier
- CFE0007073, ucf:52016
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0007073
- Title
- Dynamic Hotspot Identification for Limited Access Facilities using Temporal Traffic Data.
- Creator
-
Al Amili, Samer, Abdel-Aty, Mohamed, Radwan, Essam, Eluru, Naveen, Lee, JaeYoung, Wang, Chung-Ching, University of Central Florida
- Abstract / Description
-
Crash frequency analysis is the most critical tool to investigate traffic safety problems. Therefore, an accurate crash analysis must be conducted. Since traffic continually fluctuates over time and this effects potential of crash occurrence, shorter time periods and less aggregated traffic factors (shorter intervals than AADT) need to be used. In this dissertation, several methodologies have been conducted to elevate the accuracy of crash prediction. The performance of using less aggregated...
Show moreCrash frequency analysis is the most critical tool to investigate traffic safety problems. Therefore, an accurate crash analysis must be conducted. Since traffic continually fluctuates over time and this effects potential of crash occurrence, shorter time periods and less aggregated traffic factors (shorter intervals than AADT) need to be used. In this dissertation, several methodologies have been conducted to elevate the accuracy of crash prediction. The performance of using less aggregated traffic data in modeling crash frequency was explored for weekdays and weekends. Four-time periods for weekdays and two time periods for weekends, with four intervals (5, 15, 30, and 60 minutes). The comparison between AADT based models and short-term period models showed that short-term period models perform better. As a shorter traffic interval than AADT considered, two difficulties began. Firstly, the number of zero observations increased. Secondly, the repetition of the same roadway characteristics arose. To reduce the number of zero observations, only segments with one or more crashes were used in the modeling process. To eliminate the effect of the repetition in the data, random effect was applied. The results recommend adopting segments with only one or more crashes, as they give a more valid prediction and less error.Zero-inflated negative binomial (ZINB) and hurdle negative binomial (HNB) models were examined in addition to the negative binomial for both weekdays and weekends. Different implementations of random effects were applied. Using the random effect either on the count part, on the zero part, or a pair of uncorrelated (or correlated) random effects for both parts of the model. Additionally, the adaptive Gaussian Quadrature, with five quadrature points, was used to increase accuracy. The results reveal that the model which considered the random effect in both parts performed better than other models, and ZINB performed better than HNB.
Show less - Date Issued
- 2018
- Identifier
- CFE0006966, ucf:51682
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0006966
- Title
- GENETIC INTERVENTION AS A LIFESTYLE APPROACH: AN ANALYSIS OF DISEASE AND TREATMENT.
- Creator
-
Dempton, Jennifer, D'Amato-Kubiet, Leslee, University of Central Florida
- Abstract / Description
-
Purpose: The scientific knowledge of how genes affect disease expression and evolution can facilitate more effective environmental and drug therapy interventions delivered by health care professionals. The purpose of this paper is to a) describe the role of genetic science in healthcare; b) explore genotype determinants for environmental and pharmacological interventions; c) and analyze ethical dilemmas, barriers to access, and allocation of resources based on genotype. Methods: A review of...
Show morePurpose: The scientific knowledge of how genes affect disease expression and evolution can facilitate more effective environmental and drug therapy interventions delivered by health care professionals. The purpose of this paper is to a) describe the role of genetic science in healthcare; b) explore genotype determinants for environmental and pharmacological interventions; c) and analyze ethical dilemmas, barriers to access, and allocation of resources based on genotype. Methods: A review of literature was conducted from the disciplines of nursing, medicine, psychology, and sociology using the CINAHL, Ebsco Host, Medline, and PsychINFO databases. The search was limited to peer reviewed, full text article in English that dated from 1987 to 2011. Inclusion criteria were articles describing environmental, pharmacologic, and nutritional influence on genetic expression. Forty-five articles on genetic intervention were chosen for further review, in addition to five book publications which met inclusion criteria. Many of the sources retrieved were obtained from the biomedical sciences and published in the last decade, owing to more recent innovations in genetic discovery. Results: Disease and treatment must be approached according to genetic profiles for effectiveness and to increase health outcomes. Several variations were found regarding response to pharmaceuticals, as well as environmental exposures, based on genotype. Conclusions: Health care has been practiced using a 'universal protocol' approach; however, as the literature reveals, each individual genotype must be taken into account to provide optimal care.
Show less - Date Issued
- 2011
- Identifier
- CFH0004060, ucf:44792
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFH0004060
- Title
- Performance Evaluation of Connectivity and Capacity of Dynamic Spectrum Access Networks.
- Creator
-
Al-tameemi, Osama, Chatterjee, Mainak, Bassiouni, Mostafa, Jha, Sumit, Wei, Lei, Choudhury, Sudipto, University of Central Florida
- Abstract / Description
-
Recent measurements on radio spectrum usage have revealed the abundance of under- utilized bands of spectrum that belong to licensed users. This necessitated the paradigm shift from static to dynamic spectrum access (DSA) where secondary networks utilize unused spectrum holes in the licensed bands without causing interference to the licensed user. However, wide scale deployment of these networks have been hindered due to lack of knowledge of expected performance in realistic environments and...
Show moreRecent measurements on radio spectrum usage have revealed the abundance of under- utilized bands of spectrum that belong to licensed users. This necessitated the paradigm shift from static to dynamic spectrum access (DSA) where secondary networks utilize unused spectrum holes in the licensed bands without causing interference to the licensed user. However, wide scale deployment of these networks have been hindered due to lack of knowledge of expected performance in realistic environments and lack of cost-effective solutions for implementing spectrum database systems. In this dissertation, we address some of the fundamental challenges on how to improve the performance of DSA networks in terms of connectivity and capacity. Apart from showing performance gains via simulation experiments, we designed, implemented, and deployed testbeds that achieve economics of scale. We start by introducing network connectivity models and show that the well-established disk model does not hold true for interference-limited networks. Thus, we characterize connectivity based on signal to interference and noise ratio (SINR) and show that not all the deployed secondary nodes necessarily contribute towards the network's connectivity. We identify such nodes and show that even-though a node might be communication-visible it can still be connectivity-invisible. The invisibility of such nodes is modeled using the concept of Poisson thinning. The connectivity-visible nodes are combined with the coverage shrinkage to develop the concept of effective density which is used to characterize the con- nectivity. Further, we propose three techniques for connectivity maximization. We also show how traditional flooding techniques are not applicable under the SINR model and analyze the underlying causes for that. Moreover, we propose a modified version of probabilistic flooding that uses lower message overhead while accounting for the node outreach and in- terference. Next, we analyze the connectivity of multi-channel distributed networks and show how the invisibility that arises among the secondary nodes results in thinning which we characterize as channel abundance. We also capture the thinning that occurs due to the nodes' interference. We study the effects of interference and channel abundance using Poisson thinning on the formation of a communication link between two nodes and also on the overall connectivity of the secondary network. As for the capacity, we derive the bounds on the maximum achievable capacity of a randomly deployed secondary network with finite number of nodes in the presence of primary users since finding the exact capacity involves solving an optimization problem that shows in-scalability both in time and search space dimensionality. We speed up the optimization by reducing the optimizer's search space. Next, we characterize the QoS that secondary users can expect. We do so by using vector quantization to partition the QoS space into finite number of regions each of which is represented by one QoS index. We argue that any operating condition of the system can be mapped to one of the pre-computed QoS indices using a simple look-up in Olog (N) time thus avoiding any cumbersome computation for QoS evaluation. We implement the QoS space on an 8-bit microcontroller and show how the mathematically intensive operations can be computed in a shorter time. To demonstrate that there could be low cost solutions that scale, we present and implement an architecture that enables dynamic spectrum access for any type of network ranging from IoT to cellular. The three main components of this architecture are the RSSI sensing network, the DSA server, and the service engine. We use the concept of modular design in these components which allows transparency between them, scalability, and ease of maintenance and upgrade in a plug-n-play manner, without requiring any changes to the other components. Moreover, we provide a blueprint on how to use off-the-shelf commercially available software configurable RF chips to build low cost spectrum sensors. Using testbed experiments, we demonstrate the efficiency of the proposed architecture by comparing its performance to that of a legacy system. We show the benefits in terms of resilience to jamming, channel relinquishment on primary arrival, and best channel determination and allocation. We also show the performance gains in terms of frame error rater and spectral efficiency.
Show less - Date Issued
- 2016
- Identifier
- CFE0006063, ucf:50980
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0006063
- Title
- EXPERIENCES OF STIGMA DURING SEXUAL HEALTHCARE VISITS: A QUALITATIVE STUDY OF NON-MONOGAMOUS WOMEN.
- Creator
-
McCrosky, Rachael, Carter, Shannon, Grauerholz, Liz, Gay, David, University of Central Florida
- Abstract / Description
-
Access to health care services is critical to both personal health outcomes and health equity within a community. While non-monogamous behavior is widespread, stigma surrounding consensual non-monogamy can create barriers to health care access. This research outlines the experiences of non-monogamous women during sexual health care visits, how class acts to modify those experiences, the barriers to health care access that they encounter, and the adaptive strategies they employ. The sample for...
Show moreAccess to health care services is critical to both personal health outcomes and health equity within a community. While non-monogamous behavior is widespread, stigma surrounding consensual non-monogamy can create barriers to health care access. This research outlines the experiences of non-monogamous women during sexual health care visits, how class acts to modify those experiences, the barriers to health care access that they encounter, and the adaptive strategies they employ. The sample for this research was 23 consensually non-monogamous women. Participants were contacted through online support groups, message boards, and snowball sampling. In-depth interviews about their sexual health care experiences were conducted. Interviews were recorded, transcribed, and analyzed for themes related to the intersection of non-monogamy and health care experiences. The interactions between health care professionals and non-monogamous women, whether or not those women disclose their non-monogamous status, were often perceived as stigmatizing. Increased class status, both of participant and of provider, was described as increasing experiences of stigma and barriers to care. The information provided by this research may be used to better understand, and thus improve, the barriers health care access experienced by non-monogamous women. Suggestions given by the participants for improving their health care access and decreasing experiences of stigma are included.
Show less - Date Issued
- 2015
- Identifier
- CFE0005662, ucf:50183
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0005662
- Title
- Superintendent second-order change leadership to achieve equity and access to excellence in a large Florida school district.
- Creator
-
Wilhite, Paul, Taylor, Rosemarye, Doherty, Walter, Murray, Kenneth, Hopp, Carolyn, University of Central Florida
- Abstract / Description
-
The purpose of this study was to determine the perceptions of 244 school- and district-based administrators who were employed in a Florida school district from 2003-2011 regarding superintendent second-order change leadership decisions and events to achieve equity and access to excellence for all students in the school district. Interviews were also conducted with 11 active and retired school-based and district-based administrators to specifically address any factors that led to equity and...
Show moreThe purpose of this study was to determine the perceptions of 244 school- and district-based administrators who were employed in a Florida school district from 2003-2011 regarding superintendent second-order change leadership decisions and events to achieve equity and access to excellence for all students in the school district. Interviews were also conducted with 11 active and retired school-based and district-based administrators to specifically address any factors that led to equity and access to excellence as well as any challenges the school district faced when implementing those actions and decisions. Quantitative data were used for a historical comparison of the targeted school district prior to and after 2003 to further understand the impact of equity and access to excellence within the school district. Two superintendent decisions were believed to be extremely educationally significant by respondents: High school reading centerpiece and International Baccalaureate program launch at Seminole High School. Respondents were least familiar with Central Florida Public School Boards Coalition established and Established Principal Forum. Three events were largely believed to be extremely educationally significant by respondents: District rated A each year of accountability, District designated academically high- performing, and Unitary status achieved. Respondents were least familiar with Florida Center for Reading Research project in high schools and Superintendent Leadership transition.Responses to open-ended questions indicated that equity and access to excellence were achieved in the school district between 2003 to 2011. The decision to attain unitary status led to other actions and decisions to achieve equity and access to excellence, e.g., the creation of magnet schools, the introduction of open access to Advanced Placement courses. The superintendent's greatest challenge was perceived by respondents as lack of funding. Interviewees cited poverty as a limiting factor in achievement of equity and excellence. All respondents agreed that working with the lowest achieving 25% of students to improve performance on the Florida Comprehensive Achievement Test was key to achieving equity and excellence in the school district. Most of the interviewees believed that all students have access to equity and excellence. In offering advice to other districts, most of the interviewees stressed the importance of focusing on data, demographics, and academic programs, stating that leaders should be committed to achieving equity and excellence and there needs to be total buy-in from the whole district. Further, superintendent success depended on a clear focus, a set of core values and the willingness and courage to implement second-order change.?
Show less - Date Issued
- 2012
- Identifier
- CFE0004617, ucf:49922
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0004617
- Title
- Teachers' Perceptions of Actions to Achieve Equity and Access to Excellence in a Large School District.
- Creator
-
Moss, Sidney, Taylor, Rosemarye, Doherty, Walter, Hopp, Carolyn, Murray, Kenneth, Platt, Jennifer, University of Central Florida
- Abstract / Description
-
The purpose of this mixed-method, descriptive study was to determine the teachers' perceptions who were employed in the target school district from 2003 to 2011, regarding school district second-order change leadership decisions, events, and challenges, and the extent to which equity and access to excellence for all students were achieved. Also investigated was the relationship, if any, that existed in achieving equity and access to excellence based on school district second-order change...
Show moreThe purpose of this mixed-method, descriptive study was to determine the teachers' perceptions who were employed in the target school district from 2003 to 2011, regarding school district second-order change leadership decisions, events, and challenges, and the extent to which equity and access to excellence for all students were achieved. Also investigated was the relationship, if any, that existed in achieving equity and access to excellence based on school district second-order change leadership from 2003 to 2011. Teacher perception data were analyzed from a survey presented to teachers in over 16 schools who had been consecutively employed in the target school district from 2003 to 2011. The findings of this research suggest that teachers' perceptions of specific school district leadership decisions, events, and challenges contributed to improving opportunities for students who historically were not provided equitable opportunities for academic achievement and post high school career advancement. Beginning in 2003, the target school district underwent a leadership transition period in which a new superintendent established history-making goals and objectives for the school district. The findings suggest that based on teachers' perceptions, school district efforts provided for greater access to technology, high quality instruction, specific programs of study such as the implementation of magnet programs, and college preparation courses. The greater access provided the opportunity for equity and access to excellence for all students, especially those who historically lacked access and investment with respect to their demographics (race, gender, socioeconomic status, and ethnicity). There were limitations to this study. Objectivity may be questioned since the participants were employees of the school district. It was assumed that participants in the study responded accurately and honestly to the questions asked in the interviews and survey.Future research is recommended that would include a larger and more diverse sample. Further recommendations include separate studies to examine the differences between student achievement as a result of school district leadership efforts to attain access to equity and excellence based on college readiness assessment exam scores such as the SAT and/or the ACT, and college or technical school entrance and completion, with regard to student subgroups such as race, ethnicity, and family income.
Show less - Date Issued
- 2013
- Identifier
- CFE0004727, ucf:49819
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0004727
- Title
- Factors Influencing unmet Medical Need among U.S. Adults: Disparities in Access to Health Services.
- Creator
-
Khanijahani, Ahmad, Wan, Thomas, Malvey, Donna, Liu, Albert Xinliang, Anderson, Kim, University of Central Florida
- Abstract / Description
-
Inequities in access to health services has negative consequences on individual well-being, and imposes financial and emotional burden on patients, families, health care systems, and the public. Inequities engendered from differences in socioeconomic status, health insurance coverage, race, and other characteristics can engender disparities. This study aimed to identify the potential predictors of unmet medical need among the civilian noninstitutionalized U.S. adults. Inability to receive...
Show moreInequities in access to health services has negative consequences on individual well-being, and imposes financial and emotional burden on patients, families, health care systems, and the public. Inequities engendered from differences in socioeconomic status, health insurance coverage, race, and other characteristics can engender disparities. This study aimed to identify the potential predictors of unmet medical need among the civilian noninstitutionalized U.S. adults. Inability to receive needed medical care or receiving medical care after a delay, due to the associated costs, constructed unmet medical need. This study used a four-year (2014-2017) National Health Interview Survey (NHIS) data (sample size: 296,301 adults) and implemented a conceptual framework to study disparities in access to health services and estimate the relative importance of predisposing, enabling, and need factors as the predictors of unmet medical need. Findings from machine learning and logistics regression models highlight the importance of health insurance coverage as a key contributing factor of health disparities. About 60% of variation in unmet medical need was predictable, with over 90% accuracy, solely with health insurance coverage status. Self-rated health status, family structure, and family income to poverty ratio were other statistically significant predictors. Even after controlling for a wide variety of sociodemographic and health status variables such as age, gender, perceived health status, education, income, etc., health insurance remains significantly associated with unmet medical need (OR: 5.03, 95%CI: 4.67-5.42). To ensure precise national estimates, proper survey data analysis methods were incorporated to account for the complex sampling method used by NHIS. Furthermore, the enabling factors (health insurance and income) exert much more weight on unmet medical need than predisposing factors and need factors. The findings raise the concerns about the existence and magnitude of disparities in health care access and provide a comprehensive framework to a target population for understanding the sources of health inequities with data-driven evidence. Results can be utilized to address potential areas for designing public policy and program interventions by identifying the relative vulnerability of different population groups for lacking access to affordable health services. Future studies using longitudinal panel data are necessary to establish a causal relationship between the predictors and unmet medical need.
Show less - Date Issued
- 2019
- Identifier
- CFE0007477, ucf:52686
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0007477
- Title
- INVESTIGATING AND MODELING THE IMPACTS OF ILLEGAL U-TURN VIOLATIONS AT MEDIANS LOCATED ON FLORIDA'S LIMITED ACCESS HIGHWAYS.
- Creator
-
Al-Sahili, Omar, Al-Deek, Haitham, Hasan, Samiul, Mantzaris, Alexander, University of Central Florida
- Abstract / Description
-
Illegal U-turn violations are considered part of the Wrong-Way Driving (WWD) maneuvers that could result in head-on crashes and severe injuries, which are often severe because of the high speed of the approaching traffic and limited time to avoid such crash. Therefore, reviewing this type of violation and understanding the contributing factors that may lead drivers to commit such illegal maneuver would help officials foresee and consequently minimize the potential risks that could lead to WWD...
Show moreIllegal U-turn violations are considered part of the Wrong-Way Driving (WWD) maneuvers that could result in head-on crashes and severe injuries, which are often severe because of the high speed of the approaching traffic and limited time to avoid such crash. Therefore, reviewing this type of violation and understanding the contributing factors that may lead drivers to commit such illegal maneuver would help officials foresee and consequently minimize the potential risks that could lead to WWD crashes. The purpose of this thesis is to investigate the illegal U-turn maneuvers on limited access facilities and find the significant contributing factors that encourage or discourage drivers to commit this type of violation. The study area included the Central Florida area (CF), and the South Florida (SF) area. About 6 crossover crashes and 620 citations were found at the median facilities in the study areas from year 2011 to 2016.The modeling methodology for this thesis had three goals: predicting the number of illegal U-turn violations across the traversable grass median sections per year using a Poisson regression model, selecting the most effective variables in predicting the illegal U-turn violations using the least absolute shrinkage and selection operator (LASSO) variable selection method, and estimating the probability of an illegal U-turn violation occurrence at a paved median opening for official use only per year, using a logistic regression model. To determine the variables that influence the illegal U-turn violations, 9 geometric design and 2 traffic conditions exploratory variables were analyzed in the models mentioned earlier. Several variables were found significant from the Poisson model such as the distance to the nearest interchange, the length of the median segment, the number of access points in the segment, the median design, and the speed limit. Afterwards, the LASSO method concluded that the most effective variables found were the median design and the distance of to the nearest interchange. The logistic regression model in the CF area indicated that the speed limit and the AADT as the significant contributing factors. However, in the SF area the significant variables were the distance to the nearest access point and the spacing between the median openings. The variation in results indicates a considerable difference between the two study areas that should be accounted for during the planning phases for allocating the median countermeasures. The significant variables found in the mentioned modeling approach provide a first attempt to understand the illegal U-turn violations on limited access highways, and interpret the variables which influence drivers' behavior in performing such illegal maneuver. Along with required design guidelines, the models found could be used as effective planning tools to select the appreciate locations for installing new median openings and reevaluating the existing median openings to identify locations with the lowest potential risk.Other modeling techniques that include additional factors could be tested in future research so that appropriate countermeasures can be installed to reduce or eliminate these illegal U-turns. Furthermore, the methodology could be extended to arterials (or roads with partially controlled access).
Show less - Date Issued
- 2017
- Identifier
- CFE0006708, ucf:51905
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0006708
- Title
- Safety, Operational, and Design Analyses of Managed Toll and Connected Vehicles' Lanes.
- Creator
-
Saad, Moatz, Abdel-Aty, Mohamed, Eluru, Naveen, Hasan, Samiul, Oloufa, Amr, Yan, Xin, University of Central Florida
- Abstract / Description
-
Managed lanes (MLs) have been implemented as a vital strategy for traffic management and traffic safety improvement. The majority of previous studies involving MLs have explored a limited scope of the impact of the MLs segments as a whole, without considering the safety and operational effects of the access design. Also, there are limited studies that investigated the effect of connected vehicles (CVs) on managed lanes. Hence, this study has two main objectives: (1) the first objective is...
Show moreManaged lanes (MLs) have been implemented as a vital strategy for traffic management and traffic safety improvement. The majority of previous studies involving MLs have explored a limited scope of the impact of the MLs segments as a whole, without considering the safety and operational effects of the access design. Also, there are limited studies that investigated the effect of connected vehicles (CVs) on managed lanes. Hence, this study has two main objectives: (1) the first objective is achieved by determining the optimal managed lanes access design, including accessibility level and weaving distance for an at-grade access design. (2) the second objective is to study the effects of applying CVs and CV lanes on the MLs network. Several scenarios were tested using microscopic traffic simulation to determine the optimal access design while taking into consideration accessibility levels and weaving lengths. Both safety (e.g., standard deviation of speed, time-to-collision, and conflict rate) and operational (e.g., level of service, average speed, average delay) performance measures were included in the analyses. For the first objective, the results suggested that one accessibility level is the optimal option for the 9-mile network. A weaving length between 1,000 feet to 1,400 feet per lane change was suggested based on the safety analysis. From the operational perspective, a weaving length between 1,000 feet and 2,000 feet per lane change was recommended. The findings also suggested that MPR% between 10% and 30% was recommended when the CVs are only allowed in MLs. When increasing the number of MLs, the MPR% could be improved to reach 70%. Lastly, the findings proposed that MPR% of 100% could be achieved by allowing the CVs to use all the lanes in the network.
Show less - Date Issued
- 2019
- Identifier
- CFE0007719, ucf:52428
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0007719
- Title
- SPECTRUM SHARING AND SERVICE PRICING IN DYNAMIC SPECTRUM ACCESS NETWORKS.
- Creator
-
Brahma, Swastik, Chatterjee, Mainak, University of Central Florida
- Abstract / Description
-
Traditionally, radio spectrum has been statically allocated to wireless service providers (WSPs). Regulators, like FCC, give wireless service providers exclusive long term licenses for using specific range of frequencies in particular geographic areas. Moreover, restrictions are imposed on the technologies to be used and the services to be provided. The lack of flexibility in static spectrum allocation constrains the ability to make use of new technologies and the ability to redeploy the...
Show moreTraditionally, radio spectrum has been statically allocated to wireless service providers (WSPs). Regulators, like FCC, give wireless service providers exclusive long term licenses for using specific range of frequencies in particular geographic areas. Moreover, restrictions are imposed on the technologies to be used and the services to be provided. The lack of flexibility in static spectrum allocation constrains the ability to make use of new technologies and the ability to redeploy the spectrum to higher valued uses, thereby resulting in inefficient spectrum utilization [23, 38, 42, 62, 67]. These limitations have motivated a paradigm shift from static spectrum allocation towards a more 'liberalized' notion of spectrum management in which secondary users can borrow idle spectrum from primary spectrum licensees, without causing harmful interference to the latter- a notion commonly referred to as dynamic spectrum access (DSA) or open spectrum access ,. Cognitive radio [30, 47], empowered by Software Defined Radio (SDR), is poised to promote the efficient use of spectrum by adopting this open spectrum approach. In this dissertation, we first address the problem of dynamic channel (spectrum) access by a set of cognitive radio enabled nodes, where each node acting in a selfish manner tries to access and use as many channels as possible, subject to the interference constraints. We model the dynamic channel access problem as a modified Rubinstein-Stahl bargaining game. In our model, each node negotiates with the other nodes to obtain an agreeable sharing rule of the available channels, such that, no two interfering nodes use the same channel. We solve the bargaining game by finding Subgame Perfect Nash Equilibrium (SPNE) strategies of the nodes. First, we consider finite horizon version of the bargaining game and investigate its SPNE strategies that allow each node to maximize its utility against the other nodes (opponents). We then extend these results to the infinite horizon bargaining game. Furthermore, we identify Pareto optimal equilibria of the game for improving spectrum utilization. The bargaining solution ensures that no node is starved of channels. The spectrum that a secondary node acquires comes to it at a cost. Thus it becomes important to study the 'end system' perspective of such a cost, by focusing on its implications. Specifically, we consider the problem of incentivizing nodes to provide the service of routing using the acquired spectrum. In this problem, each secondary node having a certain capacity incurs a cost for routing traffic through it. Secondary nodes will not have an incentive to relay traffic unless they are compensated for the costs they incur in forwarding traffic. We propose a path auction scheme in which each secondary node announces its cost and capacity to the routing mechanism, both of which are considered as private information known only to the node. We design a route selection mechanism and a pricing function that can induce nodes to reveal their cost and capacity honestly (making our auction truthful), while minimizing the payment that needs to be given to the nodes (making our auction optimal). By considering capacity constraint of the nodes, we explicitly support multiple path routing. For deploying our path auction based routing mechanism in DSA networks, we provide polynomial time algorithms to find the optimal route over which traffic should be routed and to compute the payment that each node should receive. All our proposed algorithms have been evaluated via extensive simulation experiments. These results help to validate our design philosophy and also illustrate the effectiveness of our solution approach.
Show less - Date Issued
- 2011
- Identifier
- CFE0004049, ucf:49125
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0004049
- Title
- PRACTICES OF HIGH SCHOOL PRINCIPALS REGARDING OPEN ENROLLMENT IN ADVANCED PLACEMENT COURSES AND STUDENT PERFORMANCE RESULTS IN 2009.
- Creator
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Bradshaw, Leigh, Taylor, Rosemarye, University of Central Florida
- Abstract / Description
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The goal of this research was to determine whether or not there was a relationship between principalsÂÂ' reports of practices regarding open enrollment in Advanced Placement (AP) courses and student achievement results on the AP examinations. Because the percentage of the school population enrolled in AP courses and the percentage of students scoring a 3, 4, or 5 on AP examinations were anticipated to impact high school grades in Florida beginning in 2010, research from...
Show moreThe goal of this research was to determine whether or not there was a relationship between principalsÂÂ' reports of practices regarding open enrollment in Advanced Placement (AP) courses and student achievement results on the AP examinations. Because the percentage of the school population enrolled in AP courses and the percentage of students scoring a 3, 4, or 5 on AP examinations were anticipated to impact high school grades in Florida beginning in 2010, research from this study may provide important information to Florida school leaders. Because of school accountability and educational reform initiatives, the study is also important to educational leaders on a national level. Relationships between open enrollment practices shaped by high school principalsÂÂ' decisions and beliefs and the increased enrollment and student performance on AP exams were examined to allow school districts to make curricular decisions regarding rigorous curricular opportunities based on the importance of designing high school AP programs that provide equity and access for all students. The population for this study included all public high schools and their principals (N=56) in five central Florida school districts that administered AP exams in May 2009 and received a Florida Department of Education assigned school grade during the 2008-2009 school year. A multiple linear regression analysis was conducted to examine the relationships between the percentage of students from a school who took or passed the AP examination (dependent variable) and three independent variables describing principalÂÂ's attitudes toward the schoolÂÂ's AP program: (a) access and equity practices, (b) open enrollment practices, and (c) a rating of importance of the AP program. The goal was to determine if the AP examination passing percentage or enrollment percentage could be predicted by these three principal attitudinal variables. The schoolsÂÂ' percentages of students scoring a 3, 4, 5, on AP examinations or taking AP examinations were gathered from the Florida Department of Education website. PrincipalsÂÂ' reports of practices were obtained from self-report on the AP Course Enrollment Survey. When examining to what extent, if any, was there a relationship between the principals' reports of practices regarding open enrollment in AP courses and overall student achievement results on AP examinations in five central Florida counties, there were significant predictors based upon the regression model. In predicting the schoolÂÂ's percentage of white, Hispanic, and Asian populations passing the AP examinations, only the principalÂÂ's perception of access and equity was a statistically significant factor. There were no statistically significant predictors of a schoolÂÂ's percentage of African American students passing the AP examinations. Neither principalÂÂ's perception of open enrollment nor importance contributed to the model results regarding open enrollment in AP courses and overall student achievement results on AP examinations. When examining to what extent, if any, was there a relationship between the principals' reports of practices regarding open enrollment in AP courses and the percentage of students enrolled in AP courses in five central Florida counties, there were significant predictors based upon the regression model. In predicting the schoolÂÂ's percentage of students taking AP examinations, only the principalÂÂ's perception of importance was significant for overall and for all student populations. Open enrollment was significant for the overall populations as well as white and Asian subpopulations. Access/Equity was only significant for white students. Thus, importance was the main cause of the model significance regarding open enrollment in AP courses and the percentage of students enrolled in AP courses. This investigation revealed that as schools increased the access and equity in AP programs that successful student performance percentages increased as did AP course enrollment percentages. Also when the variable of importance by principals was placed on AP programs, it typically had a positive impact on student performance percentages yet sometimes caused a decrease in AP course enrollment. The investigation also revealed and was supported by research that the open enrollment practices of a school may cause a decrease in successful student performance percentages. However, open enrollment practices increase student enrollment in AP courses and student success over time. Educational leaders have the natural responsibility to increase student achievement in schools. There must be appropriate practices and procedures put in place and monitored by principals to meet accountability standards and to increase equity in and access to a rigorous curriculum for all students. Based of educational reform and school accountability demands, balancing the benefits of open enrollment for AP programs, cost effectiveness of AP programs, the allocation of scarce resources, and maintaining course validity and rigor are important issues for educational leaders to consider (College Board, 2004).
Show less - Date Issued
- 2010
- Identifier
- CFE0003245, ucf:48563
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0003245
- Title
- IS "GOOD" GOOD ENOUGH? A SMALL AREA VARIATION ANALYSIS OF DISPARITY IN EXPRESSED RATES OF ACCESS TO AND SATISFACTION WITH CHILD AND ADOLESCENT HEALTHCARE SERVICES IN EAST CENTRAL FLORIDA.
- Creator
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Schaefer, Jay, Holmes, Stephen T., University of Central Florida
- Abstract / Description
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The purpose of this dissertation research was to explore indications of disparities within the east Central Florida child and adolescent healthcare services market. Structured as a follow-up study to work completed in 2005 under the direction of the Health Council of East Central Florida assessing parental perceptions of community child and adolescent healthcare services, this research extended that evaluation by aggregating participant responses at the county and small area zip code group...
Show moreThe purpose of this dissertation research was to explore indications of disparities within the east Central Florida child and adolescent healthcare services market. Structured as a follow-up study to work completed in 2005 under the direction of the Health Council of East Central Florida assessing parental perceptions of community child and adolescent healthcare services, this research extended that evaluation by aggregating participant responses at the county and small area zip code group levels, contextually testing the uniformity of responses in understanding parent perceptions of access to, and satisfaction with, community healthcare service offerings available for children and adolescents. Under a variety of methodologies significance in the responses concerning access to healthcare services were demonstrated between the counties studied. Statistical modeling, however, could not demonstrate the core demographic differences among these data. Data representing perceptions of satisfaction with the services received by children and adolescents were demonstrated at the small area zip code group level within Orange county. Primary effect assessment of the demographic variables representing these respondents yielded findings generally consistent with theoretical expectations of disparity but, notably, the correlation effects between a number of key independent variables demonstrated a mediation of the primary effects on overall perception of satisfaction. Specifically, it was demonstrated that the interaction of white race with possession of private healthcare insurance, and the interaction of greater levels of educational attainment with black race, caused a proportional reduction in the predicted satisfaction score of these survey respondent cohorts. Further research specific to these phenomenon encompassing a clearer understanding of the type of care received and the individual's specific experiences with their healthcare providers was recommended, with ensuing research to better identify commonalities of interactions with specific area providers, local restrictions imposed by area insurance carriers, influences caused by language and/or cultural barriers, and the like as drivers in understanding the individual dynamics of satisfaction.
Show less - Date Issued
- 2010
- Identifier
- CFE0003505, ucf:48977
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0003505
- Title
- An Investigation of Gender, Prior Access to Athletics, and Interest Levels in Intercollegiate Sports of First-Time-in-College Freshmen.
- Creator
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White, Michelle, Taylor, Rosemarye, Pawlas, George, Doherty, Walter, Kaplan, Jeffrey, University of Central Florida
- Abstract / Description
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The focus of this research was to investigate the effects of gender and level of prior access to athletic programs sponsored by school, community, church, student or civic groups, and informal programs on level of first-time-in-college (FTIC) freshmen's interest in participating in intercollegiate athletics. To this end, 1,196 respondents (682 females and 514 males) who were admitted to the University of Central Florida and attended freshman orientation sessions in May and June of 2007 at the...
Show moreThe focus of this research was to investigate the effects of gender and level of prior access to athletic programs sponsored by school, community, church, student or civic groups, and informal programs on level of first-time-in-college (FTIC) freshmen's interest in participating in intercollegiate athletics. To this end, 1,196 respondents (682 females and 514 males) who were admitted to the University of Central Florida and attended freshman orientation sessions in May and June of 2007 at the UCF-Orlando campus completed the face-to-face survey. Participants ranged in age from 18 years of age to 25 years of age, representing varied racial/ethnic backgrounds, with a majority being registered as full-time students at time of the survey. The FTIC freshmen anonymously and voluntarily completed a modified version of The Student Interests in Athletics, Sports, and Fitness Survey (National Collegiate Athletic Association, 1995). Quantitative data gathered through analysis of closed-response questions provided information on their demographics, general interest in athletics, prior access to school and non-school sponsored sports, and interest in participating in college athletics. Survey responses suggested that a gender difference exists in FTIC freshmen when taking into account prior access to school and non-school sponsored athletics in predicting level of interest in participating in intercollegiate sports. FTIC freshmen males reported having more access to athletics than did FTIC freshmen females prior to attending freshmen orientation sessions in May and June of 2007. In addition, more FTIC freshmen males than females reported being interested in participating in intercollegiate athletics. Lower interest and participation rates by females in intercollegiate sports may, therefore, be an artifact of less access to opportunities to participate in sports during high school.Although almost four decades have passed with the expectation of gender equity within school settings in effect, most educational institutions are not in compliance with Title IX legislation. Females have not been afforded the same opportunities to participate in sports as males, and this appears to have influenced their interest in participating in sports. The findings of this study demonstrate the need for increased enforcement of Title IX legislation at all levels of education for true gender equity and athletic interest to be realized.
Show less - Date Issued
- 2012
- Identifier
- CFE0004458, ucf:49351
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0004458
- Title
- Affirmative Action in Higher Education and the Talented Twenty Program in Florida.
- Creator
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Ubiles, Miguel, Vieux, Andrea, Cintron Delgado, Rosa, Knuckey, Jonathan, University of Central Florida
- Abstract / Description
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Affirmative action in higher education is a necessary component for ethnic minorities to be afforded postsecondary educational access and opportunities to improve their socioeconomic status. The ban of affirmative action in undergraduate admissions, wherever instituted, has decreased the undergraduate enrollment of ethnic minorities. The broad objective of this research is to demonstrate how the elimination of affirmative action has lessened postsecondary educational access for minorities,...
Show moreAffirmative action in higher education is a necessary component for ethnic minorities to be afforded postsecondary educational access and opportunities to improve their socioeconomic status. The ban of affirmative action in undergraduate admissions, wherever instituted, has decreased the undergraduate enrollment of ethnic minorities. The broad objective of this research is to demonstrate how the elimination of affirmative action has lessened postsecondary educational access for minorities, who presently account for the majority or near-majority population in several states and will soon account for a much larger segment of the national population. This study will use two series of multiple regression models with scale-level variables to note the effect of the removal of affirmative action and the effectiveness of the Talented Twenty Program in maintaining student diversity at the University of Florida and the Florida State University. The major finding of this research is that the minority enrollment at UF and FSU was significantly related to the change in policy from affirmative action to the Talented Twenty Program. This study and the prior literature strongly suggest that the current diversity levels at these public universities are most likely a result of the university recruitment and outreach programs and population change.
Show less - Date Issued
- 2012
- Identifier
- CFE0004236, ucf:49501
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0004236
- Title
- Reliable Spectrum Hole Detection in Spectrum-Heterogeneous Mobile Cognitive Radio Networks via Sequential Bayesian Non-parametric Clustering.
- Creator
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Zaeemzadeh, Alireza, Rahnavard, Nazanin, Vosoughi, Azadeh, Qi, GuoJun, University of Central Florida
- Abstract / Description
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In this work, the problem of detecting radio spectrum opportunities in spectrum-heterogeneous cognitive radio networks is addressed. Spectrum opportunities are the frequency channels that are underutilized by the primary licensed users. Thus, by enabling the unlicensed users to detect and utilize them, we can improve the efficiency, reliability, and the flexibility of the radio spectrum usage. The main objective of this work is to discover the spectrum opportunities in time, space, and...
Show moreIn this work, the problem of detecting radio spectrum opportunities in spectrum-heterogeneous cognitive radio networks is addressed. Spectrum opportunities are the frequency channels that are underutilized by the primary licensed users. Thus, by enabling the unlicensed users to detect and utilize them, we can improve the efficiency, reliability, and the flexibility of the radio spectrum usage. The main objective of this work is to discover the spectrum opportunities in time, space, and frequency domains, by proposing a low-cost and practical framework. Spectrum-heterogeneous networks are the networks in which different sensors experience different spectrum opportunities. Thus, the sensing data from sensors cannot be combined to reach consensus and to detect the spectrum opportunities. Moreover, unreliable data, caused by noise or malicious attacks, will deteriorate the performance of the decision-making process. The problem becomes even more challenging when the locations of the sensors are unknown. In this work, a probabilistic model is proposed to cluster the sensors based on their readings, not requiring any knowledge of location of the sensors. The complexity of the model, which is the number of clusters, is automatically inferred from the sensing data. The processing node, also referred to as the base station or the fusion center, infers the probability distributions of cluster memberships, channel availabilities, and devices' reliability in an online manner. After receiving each chunk of sensing data, the probability distributions are updated, without requiring to repeat the computations on previous sensing data. All the update rules are derived mathematically, by employing Bayesian data analysis techniques and variational inference.Furthermore, the inferred probability distributions are employed to assign unique spectrum opportunities to each of the sensors. To avoid interference among the sensors, physically adjacent devices should not utilize the same channels. However, since the location of the devices is not known, cluster membership information is used as a measure of adjacency. This is based on the assumption that the measurements of the devices are spatially correlated. Thus, adjacent devices, which experience similar spectrum opportunities, belong to the same cluster. Then, the problem is mapped into a energy minimization problem and solved via graph cuts. The goal of the proposed graph-theory-based method is to assign each device an available channel, while avoiding interference among neighboring devices. The numerical simulations illustrates the effectiveness of the proposed methods, compared to the existing frameworks.
Show less - Date Issued
- 2017
- Identifier
- CFE0006963, ucf:51639
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0006963
- Title
- Digital Citizenship Tools for Cause-Based Campaigns: A Broadened Spectrum of Social Media Engagement and Participation-Scale Methodology.
- Creator
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Miller, Jennifer, Vie, Stephanie, Scott, Blake, Flammia, Madelyn, St. Amant, Kirk, University of Central Florida
- Abstract / Description
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Digital Citizenship Tools for Cause-Based Campaigns: A Broadened Spectrum of Social Media Engagement and Participation-Scale Methodology develops and applies two new tools for understanding, measuring, and recursively adjusting small to medium-size social media-based philanthropic campaigns to better foster participation and engagement(-)in other words, democratic digital citizenship. First, a theoretical model is offered broadening current binary conceptions of success and failure or impact...
Show moreDigital Citizenship Tools for Cause-Based Campaigns: A Broadened Spectrum of Social Media Engagement and Participation-Scale Methodology develops and applies two new tools for understanding, measuring, and recursively adjusting small to medium-size social media-based philanthropic campaigns to better foster participation and engagement(-)in other words, democratic digital citizenship. First, a theoretical model is offered broadening current binary conceptions of success and failure or impact of campaigns, situating specific participant actions in social media on a spectrum. Then, from that model, a new methodology is provided to measure participation and engagement generated by campaign posts. Recommendations are also offered for recursively adjusting campaign posts to better foster democratic digital citizenship. These tools were developed from data generated by #TheFaceOffChallenge, a research project representative of a typical small to medium-size cause-based campaign. #TheFaceOffChallenge also serves as a sample for analysis illustrating how to use these tools. While explicating these tools, this dissertation explores a broad range of topics related to better understanding democratic digital citizenship: online philanthropy, awareness, and digital activism; viral and memetic transmission; tensions between consumption and creation of ideas, content, and knowledge; public(s), counterpublics, and counter-efforts; literacies and access for engagement and participation in algorithmic environments; and visual communication and semiotics.
Show less - Date Issued
- 2018
- Identifier
- CFE0007227, ucf:52214
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0007227
- Title
- Masquerading Techniques in IEEE 802.11 Wireless Local Area Networks.
- Creator
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Nakhila, Omar, Zou, Changchun, Turgut, Damla, Bassiouni, Mostafa, Chatterjee, Mainak, Wang, Chung-Ching, University of Central Florida
- Abstract / Description
-
The airborne nature of wireless transmission offers a potential target for attackers to compromise IEEE 802.11 Wireless Local Area Network (WLAN). In this dissertation, we explore the current WLAN security threats and their corresponding defense solutions. In our study, we divide WLAN vulnerabilities into two aspects, client, and administrator. The client-side vulnerability investigation is based on examining the Evil Twin Attack (ETA) while our administrator side research targets Wi-Fi...
Show moreThe airborne nature of wireless transmission offers a potential target for attackers to compromise IEEE 802.11 Wireless Local Area Network (WLAN). In this dissertation, we explore the current WLAN security threats and their corresponding defense solutions. In our study, we divide WLAN vulnerabilities into two aspects, client, and administrator. The client-side vulnerability investigation is based on examining the Evil Twin Attack (ETA) while our administrator side research targets Wi-Fi Protected Access II (WPA2). Three novel techniques have been presented to detect ETA. The detection methods are based on (1) creating a secure connection to a remote server to detect the change of gateway's public IP address by switching from one Access Point (AP) to another. (2) Monitoring multiple Wi-Fi channels in a random order looking for specific data packets sent by the remote server. (3) Merging the previous solutions into one universal ETA detection method using Virtual Wireless Clients (VWCs). On the other hand, we present a new vulnerability that allows an attacker to force the victim's smartphone to consume data through the cellular network by starting the data download on the victim's cell phone without the victim's permission. A new scheme has been developed to speed up the active dictionary attack intensity on WPA2 based on two novel ideas. First, the scheme connects multiple VWCs to the AP at the same time-each VWC has its own spoofed MAC address. Second, each of the VWCs could try many passphrases using single wireless session. Furthermore, we present a new technique to avoid bandwidth limitation imposed by Wi-Fi hotspots. The proposed method creates multiple VWCs to access the WLAN. The combination of the individual bandwidth of each VWC results in an increase of the total bandwidth gained by the attacker. All proposal techniques have been implemented and evaluated in real-life scenarios.
Show less - Date Issued
- 2018
- Identifier
- CFE0007063, ucf:51979
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0007063
