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Title: A Study on Random Sum Statistics: Application to Wireless Network Performance Analysis.
Creator: Pattaramalai, Suwat, Aalo, Valentine A., Florida Atlantic University, College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
Abstract/Description: The statistics of random sum is studied and used to evaluate performance metrics in wireless networks. Pertinent wireless network performance measures such as call completion/dropping probabilities and the average number of handovers usually require the probability distributions of the cell dwell time and call holding time; and are therefore not easy to evaluate. The proposed performance evaluation technique requires the moments of the cell dwell time and is given in terms of the Laplace...
Show moreThe statistics of random sum is studied and used to evaluate performance metrics in wireless networks. Pertinent wireless network performance measures such as call completion/dropping probabilities and the average number of handovers usually require the probability distributions of the cell dwell time and call holding time; and are therefore not easy to evaluate. The proposed performance evaluation technique requires the moments of the cell dwell time and is given in terms of the Laplace transform function of the call holding time. Multimedia services that have Weibull and generalized gamma distributed call holding times are investigated. The proposed approximation method uses the compound geometric random sum distribution and requires that the geometric parameter be very small. For applications in which this parameter is not sufficiently small, a result is derived that improves the accuracy (to order of the geometric parameter) of the performance measures evaluated.
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Date Issued: 2007
PURL: http://purl.flvc.org/fau/fd/FA00012575
Subject Headings: Mobile communication systems--Technological innovations, Computer network protocols, Local area networks (Computer networks), Differentiable dynamical systems
Format: Document (PDF)

Title: Active networking and innovation: An evaluation of active networking as a driver of accelerated Internet innovation.
Creator: Wood, James L., Florida Atlantic University, Wu, Jie, College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
Abstract/Description: Innovation has flourished at the edge of the Internet; however, the core has experienced a slower pace of innovation. This lag is impacting the pace of innovation at the edge and threatening quality as ad hoc solutions are implemented to overcome core network barriers to innovation. Active networking technology, which opens up the architecture of routers, is proposed as a standard solution. Researchers draw an analogy to the computer industry where innovation is claimed to be accelerated by...
Show moreInnovation has flourished at the edge of the Internet; however, the core has experienced a slower pace of innovation. This lag is impacting the pace of innovation at the edge and threatening quality as ad hoc solutions are implemented to overcome core network barriers to innovation. Active networking technology, which opens up the architecture of routers, is proposed as a standard solution. Researchers draw an analogy to the computer industry where innovation is claimed to be accelerated by modularization. This argument is valid to the extent that the router market is similar to the computer market; however, contemporary innovation theories cast doubt on this likelihood. These theories indicate that for active networking technology to accelerate Internet innovation, extraordinary measures will be required to break the status quo. This paper analyzes this situation and makes recommendations, based on innovation theory, on how active networking can be successful in accelerating Internet innovation.
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Date Issued: 2004
PURL: http://purl.flvc.org/fcla/dt/13161
Subject Headings: Computer industry--Technological innovations, Computer networks--Management, Computer networks--Software, Routers (Computer networks), Internetworking (Telecommunication)
Format: Document (PDF)

Title: Prognosis and health monitoring communications quality of service.
Creator: Tavtilov, Timur, College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
Abstract/Description: This thesis research was funded by the Southeast National Marine Renewable Energy Center (SNMREC) at Florida Atlantic University. Its objective is the development of Quality of Service (QoS) mechanisms for the wireless communications architecture used by the Prognosis and Health Monitoring (PHM) subsystem. There are numerous technical challenges that the PHM Communications Subsystem tries to solve. Due to ocean platform mobility from waves, currents, and other environmental factors, signal...
Show moreThis thesis research was funded by the Southeast National Marine Renewable Energy Center (SNMREC) at Florida Atlantic University. Its objective is the development of Quality of Service (QoS) mechanisms for the wireless communications architecture used by the Prognosis and Health Monitoring (PHM) subsystem. There are numerous technical challenges that the PHM Communications Subsystem tries to solve. Due to ocean platform mobility from waves, currents, and other environmental factors, signal quality can vary significantly. As a result, the wireless link between the electric generator platform and shore systems will have variable quality in terms of data rate, delay, and availability. In addition, the data traffic that flows from generator sensors and PHM applications to the shore systems consists of numerous types of messages that have different QoS demands (e.g. delay) and priority that depends on the message type, user ID, sensor location, and application-dependent parameters. The PHM Communications subsystem must handle effectively high priority messages, such as alarms, alerts, and remote control commands from shore systems. It also performs QoS in the application layer, so it can read the contents of every message to prioritize them. In order to perform QoS in the application layer the PHM subsystem relies on Java Servlet multithreaded technology and different queuing techniques to control message transmission order. Furthermore, it compresses all traffic that comes from the ocean-based electric generator/turbine platform to reduce the load on the wireless link. The PHM Communications subsystem consists of three components: the wireless link, the Link Manager, and the Web Services Network Proxy. We present experimental results for the Web Services Network Proxy and demonstrate the effectiveness of XML data compression and semantic-based message scheduling over a link with variable capacity.
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Date Issued: 2011
PURL: http://purl.flvc.org/FAU/3334098
Subject Headings: Computer network architecture, Service-oriented architecture (Computer science), Wireless communication services, Technological innovations, Wireless communication services, Quality control
Format: Document (PDF)

Title: Patterns for wireless sensor networks.
Creator: Sahu, Anupama., College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
Abstract/Description: Sensors are shaping many activities in our society with an endless array of potential applications in military, civilian, and medical application. They support different real world applications ranging from common household appliances to complex systems. Technological advancement has enabled sensors to be used in medical applications, wherein they are deployed to monitor patients and assist disabled patients. Sensors have been invaluable in saving lives, be it a soldier's life in a remote...
Show moreSensors are shaping many activities in our society with an endless array of potential applications in military, civilian, and medical application. They support different real world applications ranging from common household appliances to complex systems. Technological advancement has enabled sensors to be used in medical applications, wherein they are deployed to monitor patients and assist disabled patients. Sensors have been invaluable in saving lives, be it a soldier's life in a remote battlefield or a civilian's life in a disaster area or natural calamities. In every application the sensors are deployed in a pre-defined manner to perform a specific function. Understanding the basic structure of a sensor node is essential as this would be helpful in using the sensors in devices and environments that have not been explored. In this research, patterns are used to present a more abstract view of the structure and architecture of sensor nodes and wireless sensor networks. This would help an application designer to choose from different types of sensor nodes and sensor network architectures for applications such as robotic landmine detection or remote patient monitoring systems. Moreover, it would also help the network designer to reuse, combine or modify the architectures to suit more complex needs. More importantly, they can be integrated with complete IT applications. One of the important applications of wireless sensor networks in the medical field is a remote patient monitoring system. In this work, patterns were developed to describe the architecture of patient monitoring system., This pattern describes how to connect sensor nodes and other wireless devices with each other to form a network that aims to monitor the vital signs of a person and report it to a central system. This central system could be accessed by the patient's healthcare provider for treatment purposes. This system shows one of the most important applications of sensors and it application which needs to be integrated with medical records and the use of patterns makes this integration much simpler.
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Date Issued: 2010
PURL: http://purl.flvc.org/FAU/2979380
Subject Headings: Wireless communication systems, Technological innovations, Wireless sensor networks, Design and construction, Computer network protocols, Multisensensor data fusion
Format: Document (PDF)

Title: Design and Implementation of a Solar Platform and a Fuel Cell System on an Electric Utility Vehicle.
Creator: Saelzer, Max W., Zilouchian, Ali, Florida Atlantic University, College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
Abstract/Description: In thesis work, an innovative design and implementation of a "trybrid" system is carried out. This new "trybrid" system is the continuation of the solar electric vehicle which was designed and developed as an undergraduate independent study under the supervision of Dr. Roger Messenger. The work done on this thesis consists in the implementation of the existing solar electric vehicle outfitted with a fuel cell system. For this, two fuel cell systems were analyzed as possible candidates for the...
Show moreIn thesis work, an innovative design and implementation of a "trybrid" system is carried out. This new "trybrid" system is the continuation of the solar electric vehicle which was designed and developed as an undergraduate independent study under the supervision of Dr. Roger Messenger. The work done on this thesis consists in the implementation of the existing solar electric vehicle outfitted with a fuel cell system. For this, two fuel cell systems were analyzed as possible candidates for the retrofit. Also, different hydrogen storage methods are analyzed in terms of efficiency and safety. This thesis also covers the control system utilized to manage the energy from the two different energy sources. Special attention is devoted to the method of determining the state of charge of the batteries which controls fuel cell turn on time. This first prototype shows the different functionalities and optimized features that maximize the solar energy production, and determines exactly when to turn on the fuel cell for minimum hydrogen usage.
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Date Issued: 2006
PURL: http://purl.flvc.org/fau/fd/FA00012546
Subject Headings: Electric power systems, Hybrid electric vehicles, Fuel cells--Technological innovations, Automobile industry and trade--Forecasting
Format: Document (PDF)

Title: Study and Design of a PIFA for a Human-Implanted RFID Communication System.
Creator: Jean-Charles, Yves-Thierry, Ungvichian, Vichate, Florida Atlantic University
Abstract/Description: This effort studies the implementation of a biocompatible Planar Inverted-F Antenna (PIF A) for the Medical Instrument Communication System (MICS) frequency band of 402 to 405 MHz for RFID applications. The basic electromagnetic properties of human tissues are investigated at 403 .5 MHz. Then, the radiation characteristics of submerged wire antenna are evaluated in order to approximate the effects of multilayered media on a PIFA's performance. The PIFA is assessed using Ansoft's Finite...
Show moreThis effort studies the implementation of a biocompatible Planar Inverted-F Antenna (PIF A) for the Medical Instrument Communication System (MICS) frequency band of 402 to 405 MHz for RFID applications. The basic electromagnetic properties of human tissues are investigated at 403 .5 MHz. Then, the radiation characteristics of submerged wire antenna are evaluated in order to approximate the effects of multilayered media on a PIFA's performance. The PIFA is assessed using Ansoft's Finite Element Method based electromagnetic evaluation software, HFSS v.l 0. The electrical parameters of the antenna in relation to the surrounding environment, notably air, silicone capsule, and a three-layered bio-media, are presented. The analysis shows that the resonant frequency as well as the electrical performance of the design is significantly affected by the physical dimensions and the relative permittivity of the dielectric materials covering the antenna.
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Date Issued: 2008
PURL: http://purl.flvc.org/fau/fd/FA00012529
Subject Headings: Radio frequency identification systems--Design, Antenna arrays--Design, Medical telematics, Health services administration--Technological innovations
Format: Document (PDF)

Title: Some Construction Problems Related to the Incircle of a Triangle.
Creator: Bell, Amy B., Yiu, Paul Y., Florida Atlantic University
Abstract/Description: This thesis explores several construction problems related to the incircle of a triangle. Firstly, as a generalization of a theorem of D. W. Hansen, we find two quadruples of quantities related to a triangle which have equal sums and equal sums of squares. We also study the construction problems of triangles with centroid on the incircle, and those with a specified cevian - a median, an angle bisector, or an altitude- bisected by the incircle. Detailed analysis leads to designs of animation...
Show moreThis thesis explores several construction problems related to the incircle of a triangle. Firstly, as a generalization of a theorem of D. W. Hansen, we find two quadruples of quantities related to a triangle which have equal sums and equal sums of squares. We also study the construction problems of triangles with centroid on the incircle, and those with a specified cevian - a median, an angle bisector, or an altitude- bisected by the incircle. Detailed analysis leads to designs of animation pictures using the dynamic software Geometer's Sketchpad.
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Date Issued: 2006
PURL: http://purl.flvc.org/fau/fd/FA00000725
Subject Headings: Geometry--Problems, exercises, etc, Geometry--Study and teaching (Secondary), Mathematics--Study and teaching--Technological innovations
Format: Document (PDF)

Title: Assessment of optimality of arterial signal timing plans under diurnal and day-to-day variations in traffic demand.
Creator: Ostojic, Marija, Stevanovic, Aleksandar, Florida Atlantic University, College of Engineering and Computer Science, Department of Civil, Environmental and Geomatics Engineering
Abstract/Description: Most U.S. urban traffic signal systems deploy multiple signal timing plans to account for daily variability of traffic demand (i.e. morning peak, midday, afternoon peak, off peak and night). Groups of signals (belonging to the one zone or section) along an urban arterial, usually operate in a coordinated manner. This essentially means that timing plans change at the same time for all the signals in the group, so as to facilitate vehicle progression of through a series of signals. Good traffic...
Show moreMost U.S. urban traffic signal systems deploy multiple signal timing plans to account for daily variability of traffic demand (i.e. morning peak, midday, afternoon peak, off peak and night). Groups of signals (belonging to the one zone or section) along an urban arterial, usually operate in a coordinated manner. This essentially means that timing plans change at the same time for all the signals in the group, so as to facilitate vehicle progression of through a series of signals. Good traffic signal timing practices assume a certain level of monitoring and maintenance in order to guarantee that they are efficient in servicing current traffic conditions.
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Date Issued: 2015
PURL: http://purl.flvc.org/fau/fd/FA00004457, http://purl.flvc.org/fau/fd/FA00004457
Subject Headings: Electronic traffic controls -- Evaluation, Roads -- Safety measures -- Evaluation, Signalized intersections, Traffic flow management, Traffic signs and signals -- Control systems -- Methodology, Transportation engineering -- Technological innovations
Format: Document (PDF)

Title: An Ant Inspired Dynamic Traffic Assignment for VANETs: Early Notification of Traffic Congestion and Traffic Incidents.
Creator: Arellano, Wilmer, Mahgoub, Imad, Florida Atlantic University, College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
Abstract/Description: Vehicular Ad hoc NETworks (VANETs) are a subclass of Mobile Ad hoc NETworks and represent a relatively new and very active field of research. VANETs will enable in the near future applications that will dramatically improve roadway safety and traffic efficiency. There is a need to increase traffic efficiency as the gap between the traveled and the physical lane miles keeps increasing. The Dynamic Traffic Assignment problem tries to dynamically distribute vehicles efficiently on the road...
Show moreVehicular Ad hoc NETworks (VANETs) are a subclass of Mobile Ad hoc NETworks and represent a relatively new and very active field of research. VANETs will enable in the near future applications that will dramatically improve roadway safety and traffic efficiency. There is a need to increase traffic efficiency as the gap between the traveled and the physical lane miles keeps increasing. The Dynamic Traffic Assignment problem tries to dynamically distribute vehicles efficiently on the road network and in accordance with their origins and destinations. We present a novel dynamic decentralized and infrastructure-less algorithm to alleviate traffic congestions on road networks and to fill the void left by current algorithms which are either static, centralized, or require infrastructure. The algorithm follows an online approach that seeks stochastic user equilibrium and assigns traffic as it evolves in real time, without prior knowledge of the traffic demand or the schedule of the cars that will enter the road network in the future. The Reverse Online Algorithm for the Dynamic Traffic Assignment inspired by Ant Colony Optimization for VANETs follows a metaheuristic approach that uses reports from other vehicles to update the vehicle’s perceived view of the road network and change route if necessary. To alleviate the broadcast storm spontaneous clusters are created around traffic incidents and a threshold system based on the level of congestion is used to limit the number of incidents to be reported. Simulation results for the algorithm show a great improvement on travel time over routing based on shortest distance. As the VANET transceivers have a limited range, that would limit messages to reach at most 1,000 meters, we present a modified version of this algorithm that uses a rebroadcasting scheme. This rebroadcasting scheme has been successfully tested on roadways with segments of up to 4,000 meters. This is accomplished for the case of traffic flowing in a single direction on the roads. It is anticipated that future simulations will show further improvement when traffic in the other direction is introduced and vehicles travelling in that direction are allowed to use a store carry and forward mechanism.
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Date Issued: 2016
PURL: http://purl.flvc.org/fau/fd/FA00004566, http://purl.flvc.org/fau/fd/FA00004566
Subject Headings: Vehicular ad hoc networks (Computer networks)--Technological innovations., Routing protocols (Computer network protocols), Artificial intelligence., Intelligent transportation systems., Intelligent control systems., Mobile computing., Computer algorithms., Combinatorial optimization.
Format: Document (PDF)

Title: Cement stabilization of organic soils for controlling secondary compression behavior.
Creator: Ramirez, Juan., College of Engineering and Computer Science, Department of Civil, Environmental and Geomatics Engineering
Abstract/Description: Western Palm Beach County, FL is characterized by thick deposits organic soils at shallow depths. Because of their high void ratio and compressibility, these soils undergo large primary consolidation followed by extended periods of secondary compression causing excessive premature structural distress. Although soil stabilization has been largely used with remarkable results in soft, expansive and non-organic soils, limited research and practice exist in the implementation with highly organic...
Show moreWestern Palm Beach County, FL is characterized by thick deposits organic soils at shallow depths. Because of their high void ratio and compressibility, these soils undergo large primary consolidation followed by extended periods of secondary compression causing excessive premature structural distress. Although soil stabilization has been largely used with remarkable results in soft, expansive and non-organic soils, limited research and practice exist in the implementation with highly organic soils. The main motivation of this research was to investigate the effects of cement stabilization on the compressibility behavior of organic rich soils, and develop mix design criteria for optimum cement contents necessary to induce the desired engineering behavior. This optimized mix design may provide guidelines for Deep Mixing Methods in organic soils.
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Date Issued: 2009
PURL: http://purl.flvc.org/FAU/367760
Subject Headings: Soil consolidation, Measurement, Soils, Organic compound content, Soil remediation, Technological innovations, Concrete construction, Structural stability, Design
Format: Document (PDF)

Title: Exploring teachers' perceptions of professional development in virtual learning teams.
Creator: Purnell, Courtney Paschal., College of Education, Department of Educational Leadership and Research Methodology
Abstract/Description: The demand for virtual education is rapidly increasing due to the proliferation of legislation demanding class size limitations, funding cuts, and school choice across the United States. Virtual education leaders are discovering new ways to enhance and develop teachers to become more efficient and increase quality of learning online. Learning teams are one tool implemented by professional development departments in order to obtain a community of shared best practices and increase professional...
Show moreThe demand for virtual education is rapidly increasing due to the proliferation of legislation demanding class size limitations, funding cuts, and school choice across the United States. Virtual education leaders are discovering new ways to enhance and develop teachers to become more efficient and increase quality of learning online. Learning teams are one tool implemented by professional development departments in order to obtain a community of shared best practices and increase professional learning for teachers. ... The purpose of this exploratory case study was to investigate teachers' perceptions of the contribution of virtual learning teams to their professional development in a completely online K-12 environment. ... Five major themes emerged from the interviews, which were teacher professional development as it relates to student success, collaboration, balance, knowledge gained from being part of a virtual learning team, and teachers' perception of student success.
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Date Issued: 2012
PURL: http://purl.flvc.org/FAU/3358964
Subject Headings: Education, Effect of technological innovations on, Educational leadership, School management and organization, Teams in the workplace, Group work in education, Professional learning communities, Mentoring in education, Computer networks
Format: Document (PDF)

Title: Evoking meaning: from tangible objects to digital experience.
Creator: Moreno, Lenny C. Salas., Dorothy F. Schmidt College of Arts and Letters, Department of Visual Arts and Art History
Abstract/Description: The intent of this thesis is to focus on evocative objects to explore what is lost in the transition from tangible to digital and how personal meaning is altered by digitalization. "We are witnessing the sudden dematerialization of our arts and entertainment, their transfer from unique artifacts to universal on-demand screen availability."1 As we replace objects like photographs, books and music CDs with intangible digital versions, social and physical experiences get reconfigured. With more...
Show moreThe intent of this thesis is to focus on evocative objects to explore what is lost in the transition from tangible to digital and how personal meaning is altered by digitalization. "We are witnessing the sudden dematerialization of our arts and entertainment, their transfer from unique artifacts to universal on-demand screen availability."1 As we replace objects like photographs, books and music CDs with intangible digital versions, social and physical experiences get reconfigured. With more time being spent on-line, there is a growing emphasis on exchanging digital content and the network of self-projections shared virtually. As we continue towards an increasing digital environment, understanding emerging socio-cultural practices can provide insight into new directions for graphic design.
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Date Issued: 2013
PURL: http://purl.flvc.org/fcla/dt/3360947
Subject Headings: Digital art, Cultural property, Digitization, Graphic arts, Computer-aided design, Meaning (Psychology), Postmodernism, Popular culture, Effect of technological innovations on
Format: Document (PDF)

Title: Video transcoding using machine learning.
Creator: Holder, Christopher., College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
Abstract/Description: The field of Video Transcoding has been evolving throughout the past ten years. The need for transcoding of video files has greatly increased because of the new upcoming standards which are incompatible with old ones. This thesis takes the method of using machine learning for video transcoding mode decisions and discusses ways to improve the process of generating the algorithm for implementation in different video transcoders. The transcoding methods used decrease the complexity in the mode...
Show moreThe field of Video Transcoding has been evolving throughout the past ten years. The need for transcoding of video files has greatly increased because of the new upcoming standards which are incompatible with old ones. This thesis takes the method of using machine learning for video transcoding mode decisions and discusses ways to improve the process of generating the algorithm for implementation in different video transcoders. The transcoding methods used decrease the complexity in the mode decision inside the video encoder. Also methods which automate and improve results are discussed and implemented in two different sets of transcoders: H.263 to VP6 , and MPEG-2 to H.264. Both of these transcoders have shown a complexity loss of almost 50%. Video transcoding is important because the quantity of video standards have been increasing while devices usually can only decode one specific codec.
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Date Issued: 2008
PURL: http://purl.flvc.org/FAU/166451
Subject Headings: Coding theory, Image transmission, Technological innovations, File conversion (Computer science), Data structures (Computer science), MPEG (Video coding standard), Digital media, Video compression
Format: Document (PDF)

Title: Web-based wireless sensor network monitoring using smartphones.
Creator: Marcus, Anthony M., College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
Abstract/Description: This thesis consists of the development of a web based wireless sensor network (WSN) monitoring system using smartphones. Typical WSNs consist of networks of wireless sensor nodes dispersed over predetermined areas to acquire, process, and transmit data from these locations. Often it is the case that the WSNs are located in areas too hazardous or inaccessible to humans. We focused on the need for access to this sensed data remotely and present our reference architecture to solve this problem....
Show moreThis thesis consists of the development of a web based wireless sensor network (WSN) monitoring system using smartphones. Typical WSNs consist of networks of wireless sensor nodes dispersed over predetermined areas to acquire, process, and transmit data from these locations. Often it is the case that the WSNs are located in areas too hazardous or inaccessible to humans. We focused on the need for access to this sensed data remotely and present our reference architecture to solve this problem. We developed this architecture for web-based wireless sensor network monitoring and have implemented a prototype that uses Crossbow Mica sensors and Android smartphones for bridging the wireless sensor network with the web services for data storage and retrieval. Our application has the ability to retrieve sensed data directly from a wireless senor network composed of Mica sensors and from a smartphones onboard sensors. The data is displayed on the phone's screen, and then, via Internet connection, they are forwarded to a remote database for manipulation and storage. The attributes sensed and stored by our application are temperature, light, acceleration, GPS position, and geographical direction. Authorized personnel are able to retrieve and observe this data both textually and graphically from any browser with Internet connectivity or through a native Android application. Web-based wireless sensor network architectures using smartphones provides a scalable and expandable solution with applicability in many areas, such as healthcare, environmental monitoring, infrastructure health monitoring, border security, and others.
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Date Issued: 2011
PURL: http://purl.flvc.org/FAU/3171682
Subject Headings: Smartphones, Wireless communication systems, Security measures, Wireless communication systems, Technological innovations, Computer networks, Security measures, Ad hoc networks (Computer networks), Security measures
Format: Document (PDF)

Title: Virtual science instructional strategies: a set of actual practices as perceived by secondary science educators.
Creator: Gillette, Tammy J., College of Education, Department of Educational Leadership and Research Methodology
Abstract/Description: The purpose of this proposed research study was to identify actual teaching practices/instructional strategies for online science courses. The identification of these teaching practices/instructional strategies could be used to compile a set of teaching practices/instructional strategies for virtual high school and online academy science instructors. This study could assist online science instructors by determining which teaching practices/instructional strategies were preferred for the...
Show moreThe purpose of this proposed research study was to identify actual teaching practices/instructional strategies for online science courses. The identification of these teaching practices/instructional strategies could be used to compile a set of teaching practices/instructional strategies for virtual high school and online academy science instructors. This study could assist online science instructors by determining which teaching practices/instructional strategies were preferred for the online teaching environment. The literature reviewed the role of online and face-to-face instructional strategies, then discussed and elaborated on the science instructional strategies used by teachers, specifically at the secondary level. The current literature did not reflect an integration of these areas of study. Therefore, the connectedness of these two types of instructional strategies and the creation of a set of preferred instructional practices for online science instruction was deemed necessary. For the purpose of this study, the researcher designed a survey for face-to-face and online teachers to identify preferred teaching practices, instructional strategies, and types of technology used when teaching high school science students. The survey also requested demographic data information from the faculty members, including years of experience, subject(s) taught, and whether the teacher taught in a traditional classroom or online, to determine if any of those elements affect differences in faculty perceptions with regard to the questions under investigation. The findings from the current study added to the literature by demonstrating the differences and the similarities that exist between online and face-to-face instruction. Both forms of instruction tend to rely on student-centered approaches to teaching., There were many skills that were similar in that both types of instructors tend to focus on implementing the scientific method. The primary difference is the use of technology tools that were used by online instructors. Online instructors tend to rely on more technological tools such as virtual labs. A list of preferred instructional practices was generated from the qualitative responses to the open-ended questions. Research concerned with this line of inquiry should continue in order to enhance both theory and practice in regard to online instruction.
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Date Issued: 2009
PURL: http://purl.flvc.org/FAU/2182083
Subject Headings: Distance education, Computer-assisted instruction, Science, Study and teaching (Secondary), Computer-assisted instruction, Education, Effect of technological innovations on, Teaching, Aids and devices
Format: Document (PDF)

Title: A standards-based content analysis of selected biological science websites.
Creator: Stewart, Joy E., College of Education, Department of Teaching and Learning
Abstract/Description: The purpose of this study was to analyze the biology content, instructional strategies, and assessment methods of 100 biological science websites that were appropriate for Grade 12 educational purposes. For the analysis of each website, an instrument, developed from the National Science Education Standards (NSES) for Grade 12 Life Science coupled with criteria derived from the Web-based Inquiry (WBI) for Learning Science instrument (Bodzin, 2005) and other pertinent published educational...
Show moreThe purpose of this study was to analyze the biology content, instructional strategies, and assessment methods of 100 biological science websites that were appropriate for Grade 12 educational purposes. For the analysis of each website, an instrument, developed from the National Science Education Standards (NSES) for Grade 12 Life Science coupled with criteria derived from the Web-based Inquiry (WBI) for Learning Science instrument (Bodzin, 2005) and other pertinent published educational literature, was utilized. The analysis focused on elucidating the appropriateness of the biology content, instructional strategies, and assessment tools of selected websites for facilitating the biological science education of Grade 12 students. Frequencies of agreement and disagreement of the content of each selected website with criteria included in the data collection instrument were used for alignment determination of the content of each website with the NSES. Chi-square tests were performed by Microsoft Excel to determine the statistical significance of differences of actual and expected 85% frequencies of alignment of the analyzed website parameters with indicators of alignment to NSES. Chi-square tests indicated that at a 0.05 level of significance there was an overall difference between the actual and expected 85% frequencies of alignment of biology content, instructional strategies and assessment methods with website indicators of alignment with the NSES (p < 0.05). Chi-square tests also indicated that there was a significant difference between the actual and expected frequencies of alignment of analyzed categories (biology content, instructional strategies, and assessment methods) of the sampled websites with website indicators of alignment with the NSES (p < 0.05)., Major findings of this study indicated that 3 out of 4 of the analyzed content attributes, 12 out of 13 of the instructional strategies, and all the assessment methods of the researched biological science websites were less than 85% aligned with the NSES. Only 11 out of 80 (13.75%) of the analyzed websites had collective biology content, instructional strategies, and assessment methods attributes that were 85% or more aligned with the NSES. Appropriately sequenced content that fostered acquisition of fundamental biology knowledge was the only content attribute with significantly more than 85% alignment with the NSES. Provision of illustrative examples to enhance understanding of facts and/or ideas in the context of a conceptual framework was the only instructional strategies attribute that was significantly more than 85% aligned with the NSES. Alignment of website attributes with the NSES has the potential to enhance the educational value of science websites. It is hoped that the findings of this study will motivate science website designers to comply with the NSES. Hope also exists that educators will be motivated to engage in standards-based reform measures for promoting scientific literacy among students.
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Date Issued: 2010
PURL: http://purl.flvc.org/FAU/2683127
Subject Headings: Science, Study and teaching (Secondary), Technological innovations, Science, Study and teaching (Secondary), Standards, Internet in education, Standards, Web sites, Standards
Format: Document (PDF)

Title: An uncertainty-aware reputation system in mobile networks: analysis and applications.
Creator: Li, Feng., College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
Abstract/Description: Many emerging mobile networks aim to provide wireless network services without relying on any infrastructure. The main challenge in these networks comes from their self-organized and distributed nature. There is an inherent reliance on collaboration among the participants in order to achieve the aimed functionalities. Therefore, establishing and quantifying trust, which is the driving force for collaboration, is important for applications in mobile networks. This dissertation focuses on...
Show moreMany emerging mobile networks aim to provide wireless network services without relying on any infrastructure. The main challenge in these networks comes from their self-organized and distributed nature. There is an inherent reliance on collaboration among the participants in order to achieve the aimed functionalities. Therefore, establishing and quantifying trust, which is the driving force for collaboration, is important for applications in mobile networks. This dissertation focuses on evaluating and quantifying trust to stimulate collaboration in mobile networks, introducing uncertainty concepts and metrics, as well as providing the various analysis and applications of uncertainty-aware reputation systems. Many existing reputation systems sharply divide the trust value into right or wrong, thus ignoring another core dimension of trust: uncertainty. As uncertainty deeply impacts a node's anticipation of others' behavior and decisions during interaction, we include it in the reputation system. Specifically, we use an uncertainty metric to directly reflect a node's confidence in the sufficiency of its past experience, and study how the collection of trust information may affect uncertainty in nodes' opinions. Higher uncertainty leads to higher transaction cost and reduced acceptance of communication. We exploit mobility to efficiently reduce uncertainty and to speed up trust convergence. We also apply the new reputation system to enhance the analysis of the interactions among mobile nodes, and present three sample uncertainty-aware applications. We integrate the uncertainty-aware reputation model with game theory tools, and enhance the analysis on interactions among mobile nodes., Instead of reactively protecting the mobile networks from existing attacks as in the traditional security paradigms, the analysis in this dissertation gives more insights on nodes' rationality in the interaction, which will enable the mechanism design in mobile networks to be security and incentive compatible. Moreover, we present three sample applications, in which we clearly identify the challenges, specifically formalize the problems, and cleverly employ the uncertainty mitigation schemes. These applications show that the uncertainty definition and mitigation schemes can benefit a broad range of applications, including fields such as security, network services, and routing.
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Date Issued: 2009
PURL: http://purl.flvc.org/FAU/210520
Subject Headings: Wireless communication systems, Security measures, Wireless communication systems, Technological innovations, Computer network architectures, Mobile computing, Ad hoc networks (Computer networks), Security measures
Format: Document (PDF)

Title: Joint TCP congestion control and wireless-link scheduling for mobile Internet applications.
Creator: Li, Zhaoquan., College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
Abstract/Description: The Transmission Control Protocol (TCP) is one of the core protocols of the Internet protocol suite, which is used by major Internet applications such as World Wide Web, email, remote administration and file transfer. TCP implements scalable and distributed end-to-end congestion control algorithms to share network resources among competing users. TCP was originally designed primarily for wired networks, and it has performed remarkably well as the Internet scaled up by six orders of magnitude...
Show moreThe Transmission Control Protocol (TCP) is one of the core protocols of the Internet protocol suite, which is used by major Internet applications such as World Wide Web, email, remote administration and file transfer. TCP implements scalable and distributed end-to-end congestion control algorithms to share network resources among competing users. TCP was originally designed primarily for wired networks, and it has performed remarkably well as the Internet scaled up by six orders of magnitude in the past decade. However, many studies have shown that the unmodified standard TCP performs poorly in networks with large bandwidth-delay products and/or lossy wireless links. In this thesis, we analyze the problems TCP exhibits in the wireless communication environment, and develop joint TCP congestion control and wireless-link scheduling schemes for mobile applications. ... Different from the existing solutions, the proposed schemes can be asynchronously implemented without message passing among network nodes; thus they are readily deployable with current infrastructure. Moreover, global convergence/stability of the proposed schemes to optimal equilibrium is established using the Lyapunov method in the network fluid model. Simulation results are provided to evaluate the proposed schemes in practical networks.
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Date Issued: 2013
PURL: http://purl.flvc.org/fcla/dt/3362481
Subject Headings: Wireless communication systems, Quality control, Mobile communication systems, Technological innovations, TCP/IP (Computer network protocol), Ad hoc networks (Computer networks), Computer network protocols, Wireless Internet
Format: Document (PDF)

Title: Secure routing in wireless sensor networks.
Creator: Ibriq, Jamil, College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
Abstract/Description: This research addresses communication security in the highly constrained wireless sensor environment. The goal of the research is twofold: (1) to develop a key management scheme that provides these constrained systems with the basic security requirements and evaluate its effectiveness in terms of scalability, efficiency, resiliency, connectivity, and flexibility, and (2) to implement this scheme on an appropriate routing platform and measure its efficiency., The proposed key management scheme...
Show moreThis research addresses communication security in the highly constrained wireless sensor environment. The goal of the research is twofold: (1) to develop a key management scheme that provides these constrained systems with the basic security requirements and evaluate its effectiveness in terms of scalability, efficiency, resiliency, connectivity, and flexibility, and (2) to implement this scheme on an appropriate routing platform and measure its efficiency., The proposed key management scheme is called Hierarchical Key Establishment Scheme (HIKES). In HIKES, the base station, acting as the central trust authority, empowers randomly selected sensors to act as local trust authorities, authenticating on its behalf the cluster members and issuing to them all secret keys necessary to secure their communications. HIKES uses a novel key escrow scheme that enables any sensor node selected as a cluster head to generate all the cryptographic keys needed to authenticate other sensors within its cluster. This scheme localizes secret key issuance and reduces the communication cost with the base station. The key escrow scheme also provides the HIKES with as large an addressing mechanism as needed. HIKES also provides a one-step broadcast authentication mechanism. HIKES provides entity authentication to every sensor in the network and is robust against most known attacks. We propose a hierarchical routing mechanism called Secure Hierarchical Energy-Efficient Routing protocol (SHEER). SHEER implements HIKES, which provides the communication security from the inception of the network. SHEER uses a probabilistic broadcast mechanism and a three-level hierarchical clustering architecture to improve the network energy performance and increase its lifetime., Simulation results have shown that HIKES provides an energy-efficient and scalable solution to the key management problem. Cost analysis shows that HIKES is computationally efficient and has low storage requirement. Furthermore, high degree of address flexibility can be achieved in HIKES. Therefore, this scheme meets the desired criteria set forth in this work. Simulation studies also show that SHEER is more energy-efficient and has better scalability than the secure version of LEACH using HIKES.
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Date Issued: 2007
PURL: http://purl.flvc.org/FAU/42771
Subject Headings: Sensor networks, Security measures, Ad hoc networks (Computer networks), Security measures, Wireless communication systems, Security measures, Wireless communication systems, Technological innovations, Mobile computing
Format: Document (PDF)

Title: Students' preference for online versus face-to-face academic advising based on individual learning styles.
Creator: Tuck, Jess Everet., College of Education, Department of Educational Leadership and Research Methodology
Abstract/Description: The purpose of this study was to examine students' preferred methods of academic advising services and whether they related to their individual learning styles. The first objective of the study was to determine each participant's learning style. The second objective of the study was to determine which method of academic advising each participant preferred. The third objective of the study was to determine whether a relationship existed between the participants' learning styles and preferred...
Show moreThe purpose of this study was to examine students' preferred methods of academic advising services and whether they related to their individual learning styles. The first objective of the study was to determine each participant's learning style. The second objective of the study was to determine which method of academic advising each participant preferred. The third objective of the study was to determine whether a relationship existed between the participants' learning styles and preferred methods of academic advising. Additionally, the moderating effect of gender, ethnicity, college major, high school grade point average (GPA), location, and employment on the relationship was considered. Students' learning styles were measured by the Barsch Learning Style Inventory (BLSI). Academic advising preference and demographic information were gathered through a researcher-designed questionnaire. All students (N=1,184) who completed the Online Advising & Registration System (OARS) were cont acted via e-mail and received a web link to the BLSI and student questionnaire. Data from the students (n=172) who completed the BLSI and student questionnaire were analyzed. Correlation and multiple regression analysis were used to analyze the quantitative data. A qualitative analysis of four open-ended survey questions was completed. The results found no relationship between participants' learning styles and their preferred methods of academic advising services. Additionally, gender, ethnicity, college major, high school GPA, location, and employment did not moderate the relationship between participants' learning styles and their preferred methods of academic advising services. The findings suggest that a student's learning style is not associated with his or her preference for type of advising., Furthermore, this lack of relationship did not change as a function of gender, ethnicity, college major, high school GPA, location, and employment.Recommedatations are provided for researchers and practitioners to further contribute to the literature and practice concerning academic advising preference and learning style.
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Date Issued: 2009
PURL: http://purl.flvc.org/FAU/216409
Subject Headings: Educational change, Education, Higher, Effect of technological innovations on, Counseling in higher education, Computer network resources, Faculty advisors, Computer network resources, Student-administrator relationships, Evaluation
Format: Document (PDF)

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