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- Title
- Developing a Group Decision Support System (GDSS) for decision making under uncertainty.
- Creator
-
Mokhtari, Soroush, Abdel-Aty, Mohamed, Madani Larijani, Kaveh, Wang, Dingbao, Xanthopoulos, Petros, University of Central Florida
- Abstract / Description
-
Multi-Criteria Decision Making (MCDM) problems are often associated with tradeoffs between performances of the available alternative solutions under decision making criteria. These problems become more complex when performances are associated with uncertainty. This study proposes a stochastic MCDM procedure that can handle uncertainty in MCDM problems. The proposed method coverts a stochastic MCDM problem into many deterministic ones through a Monte-Carlo (MC) selection. Each deterministic...
Show moreMulti-Criteria Decision Making (MCDM) problems are often associated with tradeoffs between performances of the available alternative solutions under decision making criteria. These problems become more complex when performances are associated with uncertainty. This study proposes a stochastic MCDM procedure that can handle uncertainty in MCDM problems. The proposed method coverts a stochastic MCDM problem into many deterministic ones through a Monte-Carlo (MC) selection. Each deterministic problem is then solved using a range of MCDM methods and the ranking order of the alternatives is established for each deterministic MCDM. The final ranking of the alternatives can be determined based on winning probabilities and ranking distribution of the alternatives. Ranking probability distributions can help the decision-maker understand the risk associated with the overall ranking of the options. Therefore, the final selection of the best alternative can be affected by the risk tolerance of the decision-makers. A Group Decision Support System (GDSS) is developed here with a user-friendly interface to facilitate the application of the proposed MC-MCDM approach in real-world multi-participant decision making for an average user. The GDSS uses a range of decision making methods to increase the robustness of the decision analysis outputs and to help understand the sensitivity of the results to level of cooperation among the decision-makers. The decision analysis methods included in the GDSS are: 1) conventional MCDM methods (Maximin, Lexicographic, TOPSIS, SAW and Dominance), appropriate when there is a high cooperation level among the decision-makers; 2) social choice rules or voting methods (Condorcet Choice, Borda scoring, Plurality, Anti-Plurality, Median Voting, Hare System of voting, Majoritarian Compromise ,and Condorcet Practical), appropriate for cases with medium cooperation level among the decision-makers; and 3) Fallback Bargaining methods (Unanimity, Q-Approval and Fallback Bargaining with Impasse), appropriate for cases with non-cooperative decision-makers. To underline the utility of the proposed method and the developed GDSS in providing valuable insights into real-world hydro-environmental group decision making, the GDSS is applied to a benchmark example, namely the California's Sacramento-San Joaquin Delta decision making problem. The implications of GDSS' outputs (winning probabilities and ranking distributions) are discussed. Findings are compared with those of previous studies, which used other methods to solve this problem, to highlight the sensitivity of the results to the choice of decision analysis methods and/or different cooperation levels among the decision-makers.
Show less - Date Issued
- 2013
- Identifier
- CFE0004723, ucf:49821
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0004723
- Title
- Human-Robot Interaction For Multi-Robot Systems.
- Creator
-
Lewis, Bennie, Sukthankar, Gita, Hughes, Charles, Laviola II, Joseph, Boloni, Ladislau, Hancock, Peter, University of Central Florida
- Abstract / Description
-
Designing an effective human-robot interaction paradigm is particularly important for complex tasks such as multi robot manipulation that require the human and robot to work together in a tightly coupled fashion. Although increasing the number of robots can expand the area that therobots can cover within a bounded period of time, a poor human-robot interface will ultimately compromise the performance of the team of robots. However, introducing a human operator to the team of robots, does not...
Show moreDesigning an effective human-robot interaction paradigm is particularly important for complex tasks such as multi robot manipulation that require the human and robot to work together in a tightly coupled fashion. Although increasing the number of robots can expand the area that therobots can cover within a bounded period of time, a poor human-robot interface will ultimately compromise the performance of the team of robots. However, introducing a human operator to the team of robots, does not automatically improve performance due to the difficulty of teleoperating mobile robots with manipulators. The human operator's concentration is divided not only amongmultiple robots but also between controlling each robot's base and arm. This complexity substantially increases the potential neglect time, since the operator's inability to effectively attend to each robot during a critical phase of the task leads to a significant degradation in task performance.There are several proven paradigms for increasing the efficacy of human-robot interaction: 1) multimodal interfaces in which the user controls the robots using voice and gesture; 2) configurable interfaces which allow the user to create new commands by demonstrating them; 3) adaptive interfaceswhich reduce the operator's workload as necessary through increasing robot autonomy. This dissertation presents an evaluation of the relative benefits of different types of user interfaces for multi-robot systems composed of robots with wheeled bases and three degree of freedom arms. It describes a design for constructing low-cost multi-robot manipulation systems from off the shelfparts.User expertise was measured along three axes (navigation, manipulation, and coordination), and participants who performed above threshold on two out of three dimensions on a calibration task were rated as expert. Our experiments reveal that the relative expertise of the user was the key determinant of the best performing interface paradigm for that user, indicating that good user modeling is essential for designing a human-robot interaction system that will be used for an extended period of time. The contributions of the dissertation include: 1) a model for detecting operator distraction from robot motion trajectories; 2) adjustable autonomy paradigms for reducing operator workload; 3) a method for creating coordinated multi-robot behaviors from demonstrations with a single robot; 4) a user modeling approach for identifying expert-novice differences from short teleoperation traces.
Show less - Date Issued
- 2014
- Identifier
- CFE0005198, ucf:50613
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0005198
- Title
- Report of the Board of Control: 1948-1950.
- Creator
-
Florida, PALMM (Project)
- Abstract / Description
-
Report of the Board of Control 1948-1950 volume. The serial report gives financial reports, including budgetary requests and recommendations for the state institutions under the management of the Board, beginning with University of Florida, Florida State College for Women, Florida School for the Deaf and Blind, and Florida Agricultural and Mechanical College for Negros. Includes independent reports from the presidents of each institution. In 1946, the Ringling Museum of Art came under Board...
Show moreReport of the Board of Control 1948-1950 volume. The serial report gives financial reports, including budgetary requests and recommendations for the state institutions under the management of the Board, beginning with University of Florida, Florida State College for Women, Florida School for the Deaf and Blind, and Florida Agricultural and Mechanical College for Negros. Includes independent reports from the presidents of each institution. In 1946, the Ringling Museum of Art came under Board control, continuing up to 1959 when a separate board was established for its administration. In 1948, the Florida State College for Women became Florida State University. Florida Agricultural and Mechanical College for Negros became Florida Agricultural and Mechanical University in 1953. A report from the newly established University of South Florida appears in the 1956/1958 volume. Planning for Florida Atlantic University is reflected in the 1960/1962 volume followed by a report from its president in the 1962/1964 volume.
Show less - Date Issued
- 1950
- Identifier
- AAA7017QF00007/21/200306/22/200417528SfasIa D0QF, ONICF134- 3, FHP C CF 2003-07-21, FCLA url 20040401xOCLC, 55693843, SN0AAA7017_0017_000, 2435021, ucf:22908
- Format
- E-book
- PURL
- http://purl.flvc.org/fcla/tc/fhp/SN0AAA7017
- Title
- Report of the Board of Control: 1950-1952.
- Creator
-
Florida. Board of Control, PALMM (Project)
- Abstract / Description
-
Report of the Board of Control 1950/1952 issue. The report serial gives financial reports, including budgetary requests and recommendations for the state institutions under the management of the Board, beginning with University of Florida, Florida State College for Women, Florida School for the Deaf and Blind, and Florida Agricultural and Mechanical College for Negros. Includes independent reports from the presidents of each institution. In 1946, the Ringling Museum of Art came under Board...
Show moreReport of the Board of Control 1950/1952 issue. The report serial gives financial reports, including budgetary requests and recommendations for the state institutions under the management of the Board, beginning with University of Florida, Florida State College for Women, Florida School for the Deaf and Blind, and Florida Agricultural and Mechanical College for Negros. Includes independent reports from the presidents of each institution. In 1946, the Ringling Museum of Art came under Board control, continuing up to 1959 when a separate board was established for its administration. In 1948, the Florida State College for Women became Florida State University. Florida Agricultural and Mechanical College for Negros became Florida Agricultural and Mechanical University in 1953. A report from the newly established University of South Florida appears in the 1956/1958 volume. Planning for Florida Atlantic University is reflected in the 1960/1962 volume followed by a report from its president in the 1962/1964 volume.
Show less - Date Issued
- 1952
- Identifier
- AAA7017QF00007/21/200306/22/200417528SfasIa D0QF, ONICF134- 3, FHP C CF 2003-07-21, FCLA url 20040401xOCLC, 55693843, SN0AAA7017_0018_000, 2436178, ucf:23477
- Format
- E-book
- PURL
- http://purl.flvc.org/fcla/tc/fhp/SN0AAA7017_0018
- Title
- The Effectiveness of Using Florida Virtual High School Course Data during the College Admission Process as a Predictor of Degree Completion Within Six Years.
- Creator
-
Callahan, Michael, King, Kathy (Kathleen), Cox, Dr. Thomas, Whiteman, JoAnn, Preston, Michael, University of Central Florida
- Abstract / Description
-
The admission process at higher education institutions has not adapted for online distance education classes taken in high schools, such as those offered by the Florida Virtual School. The purpose of this study was to determine whether online distance education courses taken in high school can serve as an indicator of student success in post-secondary education. An honors program at a large public research university provided the data examined. This honors program stored online distance...
Show moreThe admission process at higher education institutions has not adapted for online distance education classes taken in high schools, such as those offered by the Florida Virtual School. The purpose of this study was to determine whether online distance education courses taken in high school can serve as an indicator of student success in post-secondary education. An honors program at a large public research university provided the data examined. This honors program stored online distance education information in a database, which allowed for analysis. Presently, the institution's primary undergraduate admission office does not collect or store this type of information. I used SPSS Statistics to calculate logistical regression on this data. My goal was to discover what effect the high school online distance education variables had on the outcome of graduating in four or six years. Graduation rate is a key metric for colleges and universities as an indicator of success. For this reason, I wanted to determine through this study whether high school online distance education assisted in predicting which students will graduate. At least two stakeholders will find this information useful. Admission officers and, more specifically, honors admission officers will gain more insight into the student selection process as this study examines students in the top 10% of the incoming class. The other group, future researchers, will learn from this study and other new studies for even more understanding on this topic. Although the results indicated that high-achieving Florida Virtual School students do not graduate at higher rate than students who have not completed distance education classes, more research is required to understand how the other 90% of student applicants are affected by distance education courses completed in high school.
Show less - Date Issued
- 2017
- Identifier
- CFE0006861, ucf:51754
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0006861
- Title
- PANUA PARTNERS IN HOPE, NAIVASHA, KENYA: LEGAL AND DOMESTIC RELATED CHALLENGES.
- Creator
-
Holman, Keisha, Naccarato-Fromang, Gina, University of Central Florida
- Abstract / Description
-
The complexities of issues existing in Kenya create a domino effect directly affecting not only the effective management and economic growth of Kenya, but also social and legislative constraints to the lower socioeconomic classes. Land dispossession, proof of ownership to property and nationality are ongoing troubling issues affecting increased orphans and vulnerable children (OVC) in Kenya, most noticeably within predominantly poverty stricken rural enclaves. This research focuses on the...
Show moreThe complexities of issues existing in Kenya create a domino effect directly affecting not only the effective management and economic growth of Kenya, but also social and legislative constraints to the lower socioeconomic classes. Land dispossession, proof of ownership to property and nationality are ongoing troubling issues affecting increased orphans and vulnerable children (OVC) in Kenya, most noticeably within predominantly poverty stricken rural enclaves. This research focuses on the bold move of stakeholders of Trinity United Methodist Church in Naivasha, Kenya partnering with First United Methodist Church of Winter Park, Orlando, United States of America. In 2010, they conceptualized Panua Partners in Hope, a transformational ministerial assisted non-profit organization program. These churches recently established support to orphans and vulnerable children (OVC) in Naivasha, Kenya. Decisively apply all their available resources to stem the varying issues these orphaned and vulnerable children (OVC) are facing. Whereby, the program is designed to teach self-sufficiency, wealth creation through sustainable income generation and entrepreneurship, and religious relationship development. Continued education is a key component of which Panua mandates. Ongoing (learning) education ensures each child remain in school - (basic, primary and secondary school levels). In addition to ensuring orphans and vulnerable children (OVC) are legally aware of their civil, human and property rights. Conversely, these issues being perpetual worldwide challenges, however, the aim of this research is to specifically address its impactive progression on orphans and vulnerable children (OVC). Thus, outlining their local conditions, the provisions of governmental policies, and assistance, or lack thereof to remedy such current challenges. Additionally, the research will outline reformed constitutional statutes despite being ratified, have not addressed the major issues currently impinging on the freedom and rights of rural communities in Naivasha, Kenya.
Show less - Date Issued
- 2014
- Identifier
- CFH0004640, ucf:45319
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFH0004640
- Title
- COALITION FORMATION IN MULTI-AGENT UAV SYSTEMS.
- Creator
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DeJong, Paul, Boloni, Ladislau, University of Central Florida
- Abstract / Description
-
Coalitions are collections of agents that join together to solve a common problem that either cannot be solved individually or can be solved more efficiently as a group. Each individual agent has capabilities that can benefit the group when working together as a coalition. Typically, individual capabilities are joined together in an additive way when forming a coalition. This work will introduce a new operator that is used when combining capabilities, and suggest that the behavior of the...
Show moreCoalitions are collections of agents that join together to solve a common problem that either cannot be solved individually or can be solved more efficiently as a group. Each individual agent has capabilities that can benefit the group when working together as a coalition. Typically, individual capabilities are joined together in an additive way when forming a coalition. This work will introduce a new operator that is used when combining capabilities, and suggest that the behavior of the operator is contextual, depending on the nature of the capability itself. This work considers six different capabilities of Unmanned Air Vehicles (UAV) and determines the nature of the new operator in the context of each capability as coalitions (squadrons) of UAVs are formed. Coalitions are formed using three different search algorithms, both with and without heuristics: Depth-First, Depth-First Iterative Deepening, and Genetic Algorithm (GA). The effectiveness of each algorithm is evaluated. Multi agent-based UAV simulation software was developed and used to test the ideas presented. In addition to coalition formation, the software aims to address additional multi-agent issues such as agent identity, mutability, and communication as applied to UAV systems, in a realistic simulated environment. Social potential fields provide a means of modeling a clustering attractive force at the same time as a collision-avoiding repulsive force, and are used by the simulation to maintain aircraft position relative to other UAVs.
Show less - Date Issued
- 2005
- Identifier
- CFE0000394, ucf:46332
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0000394
- Title
- IMPROVING BUSINESS PERFORMANCE THROUGH THE INTEGRATION OF HUMAN FACTORS ENGINEERING INTO ORGANIZATIONS USING A SYSTEMS ENGINEERING APPROACH.
- Creator
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Philippart, Monica, Karwowski, Waldemar, University of Central Florida
- Abstract / Description
-
Most organizations today understand the valuable contribution employees as people (rather than simply bodies) provide to their overall performance. Although efforts are made to make the most of the human in organizations, there is still much room for improvement. Focus in the reduction of employee injuries such as cumulative trauma disorders rose in the 80's. Attempts at increasing performance by addressing employee satisfaction through various methods have also been ongoing for several...
Show moreMost organizations today understand the valuable contribution employees as people (rather than simply bodies) provide to their overall performance. Although efforts are made to make the most of the human in organizations, there is still much room for improvement. Focus in the reduction of employee injuries such as cumulative trauma disorders rose in the 80's. Attempts at increasing performance by addressing employee satisfaction through various methods have also been ongoing for several years now. Knowledge Management is one of the most recent attempts at controlling and making the best use of employees' knowledge. All of these efforts and more towards that same goal of making the most of people's performance at work are encompassed within the domain of the Human Factors Engineering/Ergonomics field. HFE/E provides still untapped potential for organizational performance as the human and its optimal performance are the reason for this discipline's being. Although Human Factors programs have been generated and implemented, there is still the need for a method to help organizations fully integrate this discipline into the enterprise as a whole. The purpose of this research is to develop a method to help organizations integrate HFE/E into it business processes. This research begun with a review of the ways in which the HFE/E discipline is currently used by organizations. The need and desire to integrate HFE/E into organizations was identified, and a method to accomplish this integration was conceptualized. This method consisted on the generation of two domain-specific ontologies (a Human Factors Engineering/Ergonomics ontology, and a Business ontology), and mapping the two creating a concept map that can be used to integrate HFE/E into businesses. The HFE/E ontology was built by generating two concept maps that were merged and then joined with a HFE/E discipline taxonomy. A total of four concept maps, two ontologies and a taxonomy were created, all of which are contributions to the HFE/E, and the business- and management-related fields.
Show less - Date Issued
- 2008
- Identifier
- CFE0002445, ucf:47716
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0002445
- Title
- AN INTERACTIVE DISTRIBUTED SIMULATION FRAMEWORK WITH APPLICATION TO WIRELESS NETWORKS AND INTRUSION DETECTION.
- Creator
-
Kachirski, Oleg, Guha, Ratan, University of Central Florida
- Abstract / Description
-
In this dissertation, we describe the portable, open-source distributed simulation framework (WINDS) targeting simulations of wireless network infrastructures that we have developed. We present the simulation framework which uses modular architecture and apply the framework to studies of mobility pattern effects, routing and intrusion detection mechanisms in simulations of large-scale wireless ad hoc, infrastructure, and totally mobile networks. The distributed simulations within the...
Show moreIn this dissertation, we describe the portable, open-source distributed simulation framework (WINDS) targeting simulations of wireless network infrastructures that we have developed. We present the simulation framework which uses modular architecture and apply the framework to studies of mobility pattern effects, routing and intrusion detection mechanisms in simulations of large-scale wireless ad hoc, infrastructure, and totally mobile networks. The distributed simulations within the framework execute seamlessly and transparently to the user on a symmetric multiprocessor cluster computer or a network of computers with no modifications to the code or user objects. A visual graphical interface precisely depicts simulation object states and interactions throughout the simulation execution, giving the user full control over the simulation in real time. The network configuration is detected by the framework, and communication latency is taken into consideration when dynamically adjusting the simulation clock, allowing the simulation to run on a heterogeneous computing system. The simulation framework is easily extensible to multi-cluster systems and computing grids. An entire simulation system can be constructed in a short time, utilizing user-created and supplied simulation components, including mobile nodes, base stations, routing algorithms, traffic patterns and other objects. These objects are automatically compiled and loaded by the simulation system, and are available for dynamic simulation injection at runtime. Using our distributed simulation framework, we have studied modern intrusion detection systems (IDS) and assessed applicability of existing intrusion detection techniques to wireless networks. We have developed a mobile agent-based IDS targeting mobile wireless networks, and introduced load-balancing optimizations aimed at limited-resource systems to improve intrusion detection performance. Packet-based monitoring agents of our IDS employ a CASE-based reasoner engine that performs fast lookups of network packets in the existing SNORT-based intrusion rule-set. Experiments were performed using the intrusion data from MIT Lincoln Laboratories studies, and executed on a cluster computer utilizing our distributed simulation system.
Show less - Date Issued
- 2005
- Identifier
- CFE0000642, ucf:46545
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0000642
- Title
- DESIGN, FABRICATION AND TESTING OF A SHAPE MEMORY ALLOY BASED CRYOGENIC THERMAL CONDUCTION SWITCH.
- Creator
-
Krishnan, Vinu Bala, Vaidyanathan, Raj, University of Central Florida
- Abstract / Description
-
Shape memory alloys (SMAs) can recover large strains (e.g., up to 8%) by undergoing a temperature-induced phase transformation. This strain recovery can occur against large forces, resulting in their use as actuators. The SMA elements in such actuators integrate both sensory and actuation functions. This is possible because SMAs can inherently sense a change in temperature and actuate by undergoing a shape change, associated with the temperature-induced phase transformation. The objective of...
Show moreShape memory alloys (SMAs) can recover large strains (e.g., up to 8%) by undergoing a temperature-induced phase transformation. This strain recovery can occur against large forces, resulting in their use as actuators. The SMA elements in such actuators integrate both sensory and actuation functions. This is possible because SMAs can inherently sense a change in temperature and actuate by undergoing a shape change, associated with the temperature-induced phase transformation. The objective of this work is to develop an SMA based cryogenic thermal conduction switch for operation between dewars of liquid methane and liquid oxygen in a common bulk head arrangement for NASA. The design of the thermal conduction switch is based on a biased, two-way SMA actuator and utilizes a commercially available NiTi alloy as the SMA element to demonstrate the feasibility of this concept. This work describes the design from concept to implementation, addressing methodologies and issues encountered, including: a finite element based thermal analysis, various thermo-mechanical processes carried out on the NiTi SMA elements, and fabrication and testing of a prototype switch. Furthermore, recommendations for improvements and extension to NASA's requirements are presented. Such a switch has potential application in variable thermal sinks to other cryogenic tanks for liquefaction, densification, and zero boil-off systems for advanced spaceport applications. The SMA thermal conduction switch offers the following advantages over the currently used gas gap and liquid gap thermal switches in the cryogenic range: (i) integrates both sensor and actuator elements thereby reducing the overall complexity, (ii) exhibits superior thermal isolation in the open state, and (iii) possesses high heat transfer ratios between the open and closed states. This work was supported by a grant from NASA Kennedy Space Center (NAG10-323) with William U. Notardonato as Technical Officer.
Show less - Date Issued
- 2004
- Identifier
- CFE0000038, ucf:46136
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0000038
- Title
- ARCHAEOLOGICAL GIS ANALYSIS OF RAISED FIELD AGRICULTURE IN THE BOLIVIAN AMAZON.
- Creator
-
Lee, Thomas W, Walker, John, University of Central Florida
- Abstract / Description
-
Modern agricultural systems have been criticized for their detrimental effects on the environment and a general emphasis on crop yield rather than long-term sustainability. Traditional forms of agriculture may provide case-specific examples of sustainable alternatives for contemporary societies. In the seasonally inundated savannas of the Llanos de Mojos, pre-Columbian Indians piled earth into 'large raised field platforms' elevated high enough above the floodplain to allow crops to grow....
Show moreModern agricultural systems have been criticized for their detrimental effects on the environment and a general emphasis on crop yield rather than long-term sustainability. Traditional forms of agriculture may provide case-specific examples of sustainable alternatives for contemporary societies. In the seasonally inundated savannas of the Llanos de Mojos, pre-Columbian Indians piled earth into 'large raised field platforms' elevated high enough above the floodplain to allow crops to grow. Archaeological evidence indicates that raised field agriculture supported much larger populations than those found in the Beni today. The examination of satellite imagery has revealed more than 40,000 individual fields spread across an area of approximately 7,500 square kilometers. This study created a digitized map of large raised fields to search for spatial patterns in their distribution. A GIS analysis was conducted in which fields were distributed into organizational groups based on characteristics such as proximity and orientation to cardinal direction. These groups represent potential 'social units' involved in the organization of labor required to construct raised fields. This study demonstrated the consistent presence of these units throughout the entirety of the agricultural system. Patterns in the distribution of these groups allowed the study area to be divided into two distinct regions representing a larger scale of organization within a seemingly uniform system. A transitional zone between these two regions was identified on the river Omi, providing a clear area of interest to target in future archaeological excavations. Further archaeological investigations of raised field agriculture have the potential of demonstrating the overall productivity of the system as well as how it was incorporated into the social systems of those who managed it.
Show less - Date Issued
- 2017
- Identifier
- CFH2000192, ucf:45990
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFH2000192
- Title
- SAUDI ARABIA AND EXPANSIONIST WAHHABISM.
- Creator
-
Baroni, Samiah, Handberg, Roger, University of Central Florida
- Abstract / Description
-
This thesis examines the development of Wahhabism as an ideology into a rapidly expanding, transportable, contemporary Islamic political system. Serving as the territorial foundation, individuals maintain allegiance to Makkah, the center of the Islamic world, through symbolic Islamic prayer. Along with a central, globally financed economic distributive mechanism, and Wahhabi social and educational institutions emerging from the traditional mosque, Wahhabism serves the demand for an Islamic...
Show moreThis thesis examines the development of Wahhabism as an ideology into a rapidly expanding, transportable, contemporary Islamic political system. Serving as the territorial foundation, individuals maintain allegiance to Makkah, the center of the Islamic world, through symbolic Islamic prayer. Along with a central, globally financed economic distributive mechanism, and Wahhabi social and educational institutions emerging from the traditional mosque, Wahhabism serves the demand for an Islamic political system in a late capitalist world. Wahhabism is fluid within contemporary dynamic political systems and rapidly changing international relations. Wahhabism continues to expand at a global level, at times, providing a foundation for new forms of contemporary terrorism.
Show less - Date Issued
- 2006
- Identifier
- CFE0001005, ucf:46838
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0001005
- Title
- IN VITRO SELECTION OF DNA APTAMERS AGAINST PROSTATE CANCER PEPTIDE BIOMARKERS.
- Creator
-
Kuguoglu, Elif, Kolpashchikov, Dmitry, University of Central Florida
- Abstract / Description
-
This project is aimed toward finding DNA aptamers against prostate cancer peptide antigens. DNA aptamers can function to find and indicate the presence of certain molecules in a specimen. These aptamers will be obtained through the process of evolutionary selection, a specific process called SELEX which stands for Systemic Evolution of Ligands by Experimental Enrichment. By conducting several rounds of SELEX, a DNA aptamer will be selected to bind to a known peptide antigen. A biotinylated...
Show moreThis project is aimed toward finding DNA aptamers against prostate cancer peptide antigens. DNA aptamers can function to find and indicate the presence of certain molecules in a specimen. These aptamers will be obtained through the process of evolutionary selection, a specific process called SELEX which stands for Systemic Evolution of Ligands by Experimental Enrichment. By conducting several rounds of SELEX, a DNA aptamer will be selected to bind to a known peptide antigen. A biotinylated column will be utilized to stabilize a random library of DNA aptamers, and those peptides that bind to certain aptamers will cause a conformational change leading to the elution of those specific DNA aptamers. This SELEX process will be conducted again on the eluted aptamers to further select for strong binding DNA aptamers. The DNA aptamers that are obtained can further on be sequenced or used for prostate cancer research studies. Another possible usage of aptamers is to diagnose and determine the stage of various different cancer types. Our prediction is that this research will produce a DNA aptamer that will bind to a specific prostate cancer peptide antigen.
Show less - Date Issued
- 2014
- Identifier
- CFH0004671, ucf:45294
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFH0004671
- Title
- DEMAND STUDY FOR DENTAL HYGIENE BACHELOR DEGREE PROGRAM.
- Creator
-
Driscoll, Annelise, Liberman, Aaron, University of Central Florida
- Abstract / Description
-
The following is a study to determine if sufficient demand exists to start a Bachelor of Science and Master of Science degree program in dental hygiene through a joint agreement for completion degrees between Valencia Community College and the University of Central Florida. To accomplish this objective two survey instruments were administered to randomly selected licensed dentists and dental hygienists in the state of Florida. Dental hygienists represented the potential student base for the...
Show moreThe following is a study to determine if sufficient demand exists to start a Bachelor of Science and Master of Science degree program in dental hygiene through a joint agreement for completion degrees between Valencia Community College and the University of Central Florida. To accomplish this objective two survey instruments were administered to randomly selected licensed dentists and dental hygienists in the state of Florida. Dental hygienists represented the potential student base for the proposed programs, and dentists represented the potential and prospective employers of graduated students of the proposed programs. To determine demand and demand characteristics, one survey instrument was mailed to 1,000 dental hygienists who were randomly selected using SAS software from a population of N=12,066 dental hygienists actively licensed to practice in the state of Florida. This sample of hygienists was approximately 8.3% of the total population. Of the 1,000 samples, 134 (or 13.4%) were returned. Of the 134 surveys returned, 123 (n=123) were included in this study. Eleven surveys were not included because of a majority of missing data or because the respondent indicated he or she already possessed a Bachelor or Master degree. A Likert-scale questionnaire was sent to each group of actively licensed dentists and actively licensed dental hygienists from the state of Florida. Responses from dental hygienists were overwhelmingly positive towards the addition of the Bachelor of Science degree program with an online distance-learning component. Those in favor of the Bachelor of Science degree program also provided a favorable response towards adding a Master of Science degree program in dental hygiene. The dentists, as potential future employers, also showed strong support in their responses for the additional degree programs with an additional management track component and believed it would elevate the professional standards of the dental hygiene field.
Show less - Date Issued
- 2009
- Identifier
- CFE0002842, ucf:48048
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0002842
- Title
- MODELING SCENES AND HUMAN ACTIVITIES IN VIDEOS.
- Creator
-
Basharat, Arslan, Shah, Mubarak, University of Central Florida
- Abstract / Description
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In this dissertation, we address the problem of understanding human activities in videos by developing a two-pronged approach: coarse level modeling of scene activities and fine level modeling of individual activities. At the coarse level, where the resolution of the video is low, we rely on person tracks. At the fine level, richer features are available to identify different parts of the human body, therefore we rely on the body joint tracks. There are three main goals of this dissertation: ...
Show moreIn this dissertation, we address the problem of understanding human activities in videos by developing a two-pronged approach: coarse level modeling of scene activities and fine level modeling of individual activities. At the coarse level, where the resolution of the video is low, we rely on person tracks. At the fine level, richer features are available to identify different parts of the human body, therefore we rely on the body joint tracks. There are three main goals of this dissertation: (1) identify unusual activities at the coarse level, (2) recognize different activities at the fine level, and (3) predict the behavior for synthesizing and tracking activities at the fine level. The first goal is addressed by modeling activities at the coarse level through two novel and complementing approaches. The first approach learns the behavior of individuals by capturing the patterns of motion and size of objects in a compact model. Probability density function (pdf) at each pixel is modeled as a multivariate Gaussian Mixture Model (GMM), which is learnt using unsupervised expectation maximization (EM). In contrast, the second approach learns the interaction of object pairs concurrently present in the scene. This can be useful in detecting more complex activities than those modeled by the first approach. We use a 14-dimensional Kernel Density Estimation (KDE) that captures motion and size of concurrently tracked objects. The proposed models have been successfully used to automatically detect activities like unusual person drop-off and pickup, jaywalking, etc. The second and third goals of modeling human activities at the fine level are addressed by employing concepts from theory of chaos and non-linear dynamical systems. We show that the proposed model is useful for recognition and prediction of the underlying dynamics of human activities. We treat the trajectories of human body joints as the observed time series generated from an underlying dynamical system. The observed data is used to reconstruct a phase (or state) space of appropriate dimension by employing the delay-embedding technique. This transformation is performed without assuming an exact model of the underlying dynamics and provides a characteristic representation that will prove to be vital for recognition and prediction tasks. For recognition, properties of phase space are captured in terms of dynamical and metric invariants, which include the Lyapunov exponent, correlation integral, and correlation dimension. A composite feature vector containing these invariants represents the action and will be used for classification. For prediction, kernel regression is used in the phase space to compute predictions with a specified initial condition. This approach has the advantage of modeling dynamics without making any assumptions about the exact form (polynomial, radial basis, etc.) of the mapping function. We demonstrate the utility of these predictions for human activity synthesis and tracking.
Show less - Date Issued
- 2009
- Identifier
- CFE0002897, ucf:48042
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0002897
- Title
- Driving Towards Sustainability: A Case Study of the Facilitators and Inhibitors of Electrifying Drive Tourism within the United States National Park System.
- Creator
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Templeton, Amanda, Fjelstul, Jill, Fyall, Alan, Tasci, Asli, Prideaux, Bruce, University of Central Florida
- Abstract / Description
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Drive tourism has proven to be a popular sub-sector of the tourism industry, given its ability to offer tourists a substantial amount of flexibility and sense of freedom in determining what destinations to explore. Few studies have examined the future of the drive tourism with consideration to changing technologies and growing awareness to the impact of carbon emissions and Green House Gasses. Research has recently begun to examine the ecological consequences of park transportation systems....
Show moreDrive tourism has proven to be a popular sub-sector of the tourism industry, given its ability to offer tourists a substantial amount of flexibility and sense of freedom in determining what destinations to explore. Few studies have examined the future of the drive tourism with consideration to changing technologies and growing awareness to the impact of carbon emissions and Green House Gasses. Research has recently begun to examine the ecological consequences of park transportation systems. Some of these problems can be seen within the United States National Park System (NPS), as various park units are experiencing problems related to infrastructure and preservation of sites. As transportation plays an integral role within the NPS, the impacts of drive tourism must be considered. The study is founded on the premise that electric vehicles and electric vehicle charging stations will reduce GHG emissions, thereby increasing sustainability, supporting sustainable tourism and sustainable drive tourism within the NPS. In an effort to promote sustainable transportation efforts throughout the NPS this study investigates the facilitators that enable an EV infrastructure in some parks and inhibitors for other parks that have yet to develop an EV infrastructure. A qualitative methodology was adopted for this study. Data were analyzed using NVivo with findings being presented in case study format. The study, which offers a conceptual model and offers new definitions for electric vehicles and electric vehicle infrastructure within nature based tourism context, finds key facilitators to include: collaborative efforts through public/private partnerships, strong leadership within the NPS, and availability of funding; major inhibitors being: geography of park unit, lack cultural openness within NPS park unit, and regulatory policies. Current research has given little attention to the future sustainability of drive tourism, allowing this study to add to the academic body of knowledge. Additionally, the suggestions offered in the study are relevantly timed to what is happening within the industry.
Show less - Date Issued
- 2018
- Identifier
- CFE0007107, ucf:51967
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0007107
- Title
- Assessment of a Surface Water Supply for Source and Treated Distribution System Quality.
- Creator
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Rodriguez, Angela, Duranceau, Steven, Lee, Woo Hyoung, Sadmani, A H M Anwar, University of Central Florida
- Abstract / Description
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This study focused on providing a source to tap assessment of surface water systems with respect to (i) the use of alternative biomonitoring tools, (ii) disinfection byproduct (DBP) formation and control, and (iii) corrosion control. In the first study component, two water systems were microbiologically evaluated using adenosine triphosphate (ATP) bioluminescence technology. It was determined that microbial ATP was useful as a surrogate for biomonitoring within a surface water system when...
Show moreThis study focused on providing a source to tap assessment of surface water systems with respect to (i) the use of alternative biomonitoring tools, (ii) disinfection byproduct (DBP) formation and control, and (iii) corrosion control. In the first study component, two water systems were microbiologically evaluated using adenosine triphosphate (ATP) bioluminescence technology. It was determined that microbial ATP was useful as a surrogate for biomonitoring within a surface water system when paired with traditional methods. Although microbial activity differed between distribution systems that used either chloramine or chlorine disinfectant, in both cases flowrate and season affected microbial ATP values. In the second study component, total trihalomethanes (TTHM) and haloacetic acids (HAA5) DBP formation and disinfectant stability was investigated using a novel DBP control process. The method relied on a combination of sulfate, ultraviolet light irradiation, pH, and aeration unit operations. Results indicate respective decreases in 7-day TTHM and HAA5 formation potentials of 36% - 57% and 20% - 47% for the surface waters investigated. In the third component of this work, a corrosion study assessed the effect of disinfectant chemical transitions on the corrosion rates of common distribution system metals. When a chlorine based disinfection system transitioned between chlorine and chloramine, mild steel corrosion increased by 0.45 mils per year (mpy) under chloramine and returned to baseline corrosion rates under chlorine. However, when a chloramine based disinfection system transitioned between chloramine and chlorine, mild steel corrosion increased in tandem with total chlorine levels. Unlike the chlorine system, the mild steel corrosion rates did not return to baseline under chloramine after exposure to 5 mg/L of total chlorine. Surface water systems should consider the use of ATP as a surrogate for biomonitoring, consider the novel treatment process for DBP formation control, and consider corrosion control in disinfectant decision-making activities.
Show less - Date Issued
- 2019
- Identifier
- CFE0007901, ucf:52751
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0007901
- Title
- Experimental Investigation of Advanced Ignition Systems for High Efficiency Combustion.
- Creator
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Almansour, Bader, Vasu Sumathi, Subith, Kapat, Jayanta, Kassab, Alain, Sarathy, S.Mani, University of Central Florida
- Abstract / Description
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Consumption of fossil and bio-derived fuels is growing due to energy demands associated with increase in population and standard of living across the globe. Power generation and transportation sectors are the primary two sources of fuel consumption, which have raised the demand for crude oil and led to serious environmental pollution issues. This demand for energy forced various government agencies to strengthen the allowable exhaust pollutant concentration limits. Recently, CO, CO2,...
Show moreConsumption of fossil and bio-derived fuels is growing due to energy demands associated with increase in population and standard of living across the globe. Power generation and transportation sectors are the primary two sources of fuel consumption, which have raised the demand for crude oil and led to serious environmental pollution issues. This demand for energy forced various government agencies to strengthen the allowable exhaust pollutant concentration limits. Recently, CO, CO2, particulate matter, and nitrogen oxides (NOx) emission restrictions have become more stringent to the extent that engines must operate at higher energy densities and efficiencies. Towards this goal, this doctoral study focused on evaluating advanced ignition systems and testing new biofuels for automotive combustion applications. First, a natural gas lean combustion mode was assessed by using advance ignition systems to provide higher brake power while maintaining the exhaust limits. A rigorous combustion data analysis was performed to identify the main reasons leading to improved performance in the case of prechamber equipped laser ignition. An overall efficiency improvement of 2.1% points was observed, compared to spark ignition, which in turn leads to save 633 PJ per year. In the second part of this dissertation, a spherical chamber was designed and validated to measure the laminar burning velocity (LBV) of a promising biofuel: 2,4-Dimethyl-3-pentanone, (DIPK), for homogenous charge compression ignition engines. LBV measurements were carried out with various diluent species (N2, Ar, and He) in order to provide several data points for development and validation of DIPK chemical kinetic mechanisms. It has been found that DIPK does not only have higher temperature and pressure sensitivities (compared to iso-octane), but additionally enabled a faster laminar burning velocity which leads to higher rate of heat release in reciprocating engines.
Show less - Date Issued
- 2018
- Identifier
- CFE0007387, ucf:52062
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0007387
- Title
- Investigating Novel Water Treatment Methods and Monitoring Techniques for Sulfide-Laden Groundwater Supplies.
- Creator
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Yoakum, Benjamin, Duranceau, Steven, Lee, Woo Hyoung, Sadmani, A H M Anwar, Moore, Sean, University of Central Florida
- Abstract / Description
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This dissertation reports on research related to novel water treatment and monitoring techniques for sulfide-laden groundwater supplies. The dissertation is divided into several chapters with four core chapters focused on investigations studying a novel water treatment method or monitoring technique. The first investigation assessed the efficacy of multi-pass spray aeration treatment to remove trihalomethanes (THMs) and to reduce the total THM formation potential (TTHMFP) of an aerated water...
Show moreThis dissertation reports on research related to novel water treatment and monitoring techniques for sulfide-laden groundwater supplies. The dissertation is divided into several chapters with four core chapters focused on investigations studying a novel water treatment method or monitoring technique. The first investigation assessed the efficacy of multi-pass spray aeration treatment to remove trihalomethanes (THMs) and to reduce the total THM formation potential (TTHMFP) of an aerated water column post-aeration. A recirculating spray aeration pilot unit was constructed to make this assessment. To assess the effect of multi-pass spray aeration on the TTHMFP, water was recirculated through a fabricated spray nozzle for various lengths of time. Results showed that multi-pass spray aeration can remove chloroform, dichlorobromomethane, dibromochloromethane and bromoform to below detection levels ((<) 0.7 ppb) for the waters investigated. Additionally, spray aeration reduced the TTHMFP of chlorinated water. Results suggest multi-pass spray aeration may be a viable treatment option for some bromide container waters. Results also indicate that multi-pass spray aeration removes bromide from the bulk water in the form of organically bound volatile compounds.The second investigation assessed the efficacy of using pre-existing tray aeration infrastructure to comply with disinfection by-product (DBP) regulations. To assess the efficacy of tray aerators to reduce the concentration TTHMs a pilot tray aerator was constructed. Results showed that after five tray passes (each pass consisting of water being passed over five trays) the concentration of TTHMs was below the detection limit ((<) 0.7 ppb) for the water investigated. To assess the efficacy of tray aeration at full-scale, a water treatment plant and the distribution system it serves were monitored for eight months. Results showed an approximate 40 ppb reduction in the TTHM concentration at two on-site monitoring locations and the one off-site monitoring location (initial concentrations being approximately 54 ppb, 60 ppb and 73 ppb, respectively). Results suggest that the utility managing the full-scale system could comply with DBP regulations by using the pre-existing tray aeration infrastructure to reduce formed THMs on-site where regulated haloacetic acids are not predominant.The third investigation assessed the efficacy of using biological activated carbon (BAC) to remove disinfection by-product precursor matter to comply with DBP regulations. To research this method, a pilot scale BAC filter was operated for three independent test runs. In addition, two full-scale WTPs using BAC were monitored over time. Results showed an approximate 40 percent removal of dissolved organic carbon (DOC) during the three pilot runs and an approximate 55 percent removal of DOC during full-scale monitoring. Results showed that the reduction in DOC reduced the TTHMFP of BAC treated water. Results suggest that BAC treatment could be a viable treatment option to comply with DBP regulations in the sulfide-laden water studied.The fourth investigation assessed the suitability of oxidation reduction potential (ORP) to monitor the effectiveness of an oxidizing media filter used to remove sulfur from a sulfide-laden groundwater. Results showed that ORP was more useful as a measurement technique as compared to free chlorine residual when assessing filter bed health and regeneration effectiveness. It was determined that when the ORP measurement taken from within the oxidative media layer was below 500 mV, the filter bed was not providing treatment, and manganese could be released. Results showed a significant increase in turbidity ((>) 2 NTU) and total manganese ((>) 0.05 mg/L) occurred when the ORP within the filter bed dropped below 400 mV. More frequent cycling of the filters was found to be an effective treatment option to maintain ORP values above an identified 400 mV operational threshold.
Show less - Date Issued
- 2017
- Identifier
- CFE0007141, ucf:52317
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0007141
- Title
- Applications of Deep Learning Models for Traffic Prediction Problems.
- Creator
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Rahman, Rezaur, Hasan, Samiul, Abdel-Aty, Mohamed, Zaki Hussein, Mohamed, University of Central Florida
- Abstract / Description
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Deep learning coupled with existing sensors based multiresolution traffic data and future connected technologies has immense potential to improve traffic operation and management. But to deal with complex transportation problems, we need efficient modeling frameworks for deep learning models. In this study, we propose two different modeling frameworks using Deep Long Short-Term Memory Neural Network (LSTM NN) model to predict future traffic state (speed and signal queue length). In our first...
Show moreDeep learning coupled with existing sensors based multiresolution traffic data and future connected technologies has immense potential to improve traffic operation and management. But to deal with complex transportation problems, we need efficient modeling frameworks for deep learning models. In this study, we propose two different modeling frameworks using Deep Long Short-Term Memory Neural Network (LSTM NN) model to predict future traffic state (speed and signal queue length). In our first problem, we present a modeling framework using deep LSTM NN model to predict traffic speeds in freeways during regular traffic condition as well as under extreme traffic demand, such as a hurricane evacuation. The approach is tested using real-world traffic data collected during hurricane Irma's evacuation for the interstate 75 (I-75), a major evacuation route in Florida. We perform several experiments for predicting speeds for 5 min, 10 min, and 15 min ahead of current time. The results are compared against other traditional prediction models such as K-Nearest Neighbor, Analytic Neural Network (ANN), Auto-Regressive Integrated Moving Average (ARIMA). We find that LSTM-NN performs better than these parametric and non-parametric models. Apart from the improvement in traffic operation, the proposed method can be integrated with evacuation traffic management systems for a better evacuation operation. In our second problem, we develop a data-driven real-time queue length prediction technique using deep LSTM NN model. We consider a connected corridor where information from vehicle detectors (located at the intersection) will be shared to consecutive intersections. We assume that the queue length of an intersection in the next cycle will depend on the queue length of the target and two upstream intersections in the current cycle. We use InSync Adaptive Traffic Control System (ATCS) data to train a Long Short-Term Memory Neural Network model capturing time-dependent patterns of a queue of a signal. To select the best combination of hyperparameters, we use sequential model-based optimization (SMBO) technique. Our experiment results show that the proposed modeling framework performs very well to predict the queue length. Although we run our experiments predicting the queue length for a single movement, the proposed method can be applied for other movements as well. Queue length prediction is a crucial part of an ATCS to optimize control parameters and this method can improve the existing signal optimization technique for ATCS.
Show less - Date Issued
- 2019
- Identifier
- CFE0007516, ucf:52654
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0007516
