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2007

Retrospective Theses and Dissertations

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Articles 1 - 30 of 148

Full-Text Articles in Physical Sciences and Mathematics

Electron Correlation: Theory And Practice, Ryan Michael Olson Jan 2007

Electron Correlation: Theory And Practice, Ryan Michael Olson

Retrospective Theses and Dissertations

No abstract provided.


Survivability Issues In Wdm Optical Networks, Chang Liu Jan 2007

Survivability Issues In Wdm Optical Networks, Chang Liu

Retrospective Theses and Dissertations

WDM optical networks make it possible for the bandwidth of transport networks to reach a level on which any failures would cause tremendous data loss and affect a lot of users. Thus, survivability issues of WDM optical networks have attracted a lot of research work. Within the scope of this dissertation, two categories of problems are studied, one is survivable mapping from IP topology to WDM topology, the other is p-cycle protection schemes in WDM networks.;Survivable mapping problem can be described as routing IP links on the WDM topology such that the IP topology stays connected under any single ...


Algorithms In Supertree Inference And Phylogenetic Data Mining, Duhong Chen Jan 2007

Algorithms In Supertree Inference And Phylogenetic Data Mining, Duhong Chen

Retrospective Theses and Dissertations

Science and society would benefit enormously from comprehensive phylogenetic knowledge of the Tree of Life (ToL), a framework that includes above 1.7 million species on Earth. ToL shows how living things have evolved since the origins of life billions of years ago. With existing computational approaches, we cannot produce a global estimate of evolutionary history from molecular data of all these species. Therefore, the development of computer algorithms and methods is critical to the field of phyloinformatics. The goal of this dissertation is to design, analyze, and implement algorithms to solve three specific problems in the field of phyloinformatics ...


Performance And Security Measure Of Clustering Protocols For Sensor Networks, Pubali Banerjee Jan 2007

Performance And Security Measure Of Clustering Protocols For Sensor Networks, Pubali Banerjee

Retrospective Theses and Dissertations

Micro sensor nodes are now easily available and are very cheap. These resource constrained nodes are spread in remote locations to gather data. There are some energy efficient clustering protocols that are known to work well for sensor networks. The performance of these algorithms are mainly measured by the their energy consumption. In this thesis, we develop a performance measure for these algorithms that includes the energy spent, the time delay incurred in the whole process and the information loss. We have formulated a novel metric, the entropy based information loss metric, which to the best of our knowledge has ...


Advanced Detection And Separation Methods: Developments In Surface-Enhanced Raman Scattering Readout Immunoassays And Electrochemically Modulated Liquid Chromatography, Betsy Jean Yakes Jan 2007

Advanced Detection And Separation Methods: Developments In Surface-Enhanced Raman Scattering Readout Immunoassays And Electrochemically Modulated Liquid Chromatography, Betsy Jean Yakes

Retrospective Theses and Dissertations

This dissertation explores the use of novel detection methods for biological and chemical components commonly found in the environment. It encompasses two techniques: surface-enhanced Raman scattering (SERS) and electrochemically modulated liquid chromatography (EMLC).;Immunoassays using SERS as a readout tool have been developed in this laboratory and have shown low levels of detection (i.e., pico- to femtomolar and single binding event detection) for disease and biowarfare agents. This thesis seeks to further the performance of this platform for bacteria detection and explore strategies to increase the SERS response. Specifically, the first section of this dissertation focuses on the detection ...


The Design And Analysis Of Microarray Experiments Using Pooled Samples For The Study Of Quantitative Traits, Wuyan Zhang Jan 2007

The Design And Analysis Of Microarray Experiments Using Pooled Samples For The Study Of Quantitative Traits, Wuyan Zhang

Retrospective Theses and Dissertations

No abstract provided.


Strict Self-Assembly Of Discrete Sierpinski Triangles, Scott Martin Summers Jan 2007

Strict Self-Assembly Of Discrete Sierpinski Triangles, Scott Martin Summers

Retrospective Theses and Dissertations

No abstract provided.


Gis Modeling Of Urbanization Impacts On Natural Resources, Dakota County, Minnesota, Lan Wei Jan 2007

Gis Modeling Of Urbanization Impacts On Natural Resources, Dakota County, Minnesota, Lan Wei

Retrospective Theses and Dissertations

This research focused on the impacts of urbanization in natural resources and land-cover changes due to urban development in Dakota County, Minnesota. An existing planning guide, the 2030 Regional Development Framework (2030 RDF) for the Twin Cities Metro Area, was analyzed and employed as a reference in this research. Geographic information systems (GIS) technology was used to help determine characteristics of urban land-cover changes, such as population change, land cover changes, and the environmental impacts on natural resources caused by urban development. Furthermore, land suitability modeling was utilized to analyze possible future development, from the perspectives of urban expansion and ...


Palladium Migrations And Aryne Annulations, Jian Zhao Jan 2007

Palladium Migrations And Aryne Annulations, Jian Zhao

Retrospective Theses and Dissertations

No abstract provided.


Nmr Investigations Of Biological And Synthetic Phosphate-Based Nanocomposites, Aditya Rawal Jan 2007

Nmr Investigations Of Biological And Synthetic Phosphate-Based Nanocomposites, Aditya Rawal

Retrospective Theses and Dissertations

The study of complex organic, inorganic and composite systems is greatly facilitated by solid state nuclear magnetic resonance (NMR) spectroscopy. This is especially true for materials lacking crystalline long-range order or having low atomic mass contrast, such as amorphous organic materials, which renders other methods such as x-ray diffraction (XRD) and transmission electron microscopy (TEM) incapable of comprehensive characterization. In this dissertation, a variety of one- and two-dimensional (2D) solid-state NMR measurements are applied to investigate the composition and nanometer-scale structure of a variety of organic-inorganic hybrid systems as well as complex inorganic phases. Bone, which is a natural nanocomposite ...


Quantum Phases In Frustrated Strongly Correlated 2-D Systems, Jun Liu Jan 2007

Quantum Phases In Frustrated Strongly Correlated 2-D Systems, Jun Liu

Retrospective Theses and Dissertations

The strong Coulomb repulsion between charge carriers in a system with one electron per site can lead to a full localization of the electrons. The resulting state is called a Mott insulating state. The interplay between the physics of Mott insulators and of unconventional superconductors has been a focus in condensed matter physics for a long time. Although it has frequently been argued that the proximity to a Mott insulating phase is responsible for the emergence of unconventional superconductivity, little progress has been made in obtaining a convincing microscopic theory. Due to the strong electron-electron (e-e) interaction involved in Mott ...


Solar Heating Of A Residential Building In Kazakhstan, Ernar Aidargazaevich Makishev Jan 2007

Solar Heating Of A Residential Building In Kazakhstan, Ernar Aidargazaevich Makishev

Retrospective Theses and Dissertations

A study of flat-type solar space heating for a residential building has been done. The study includes comparing of several solar radiation estimating methods. Computer simulation is written in Matlab. Full code is listed in the Appendix. The results show that flat-type solar collectors can perform well under the severe weather conditions and the radiation levels of Astana, Kazakhstan. However, the simulation of a solar space heating system compared to an electric resistance heating system showed that the solar heating system that is simulated cannot provide enough heating capacity to heat the building without 50% backup system. In addition, the ...


Absorption And Emission Properties Of Photonic Crystals And Metamaterials, Lili Peng Jan 2007

Absorption And Emission Properties Of Photonic Crystals And Metamaterials, Lili Peng

Retrospective Theses and Dissertations

We study the emission and absorption properties of photonic crystals and metamaterials using Comsol Multiphysics and Ansoft HFSS as simulation tools.;We calculate the emission properties of metallic designs using drude model and the results illustrate that an appropriate termination of the surface of the metallic structure can significantly increase the absorption and therefore the thermal emissivity.;We investigate the spontaneous emission rate modifications that occur for emitters inside two-dimensional photonic crystals and find the isotropic and directional emissions with respect to different frequencies as we have expected.


Optimal Genco Bidding Strategy, Feng Gao Jan 2007

Optimal Genco Bidding Strategy, Feng Gao

Retrospective Theses and Dissertations

Electricity industries worldwide are undergoing a period of profound upheaval. The conventional vertically integrated mechanism is being replaced by a competitive market environment. Generation companies have incentives to apply novel technologies to lower production costs, for example: Combined Cycle units. Economic dispatch with Combined Cycle units becomes a non-convex optimization problem, which is difficult if not impossible to solve by conventional methods. Several techniques are proposed here: Mixed Integer Linear Programming, a hybrid method, as well as Evolutionary Algorithms. Evolutionary Algorithms share a common mechanism, stochastic searching per generation. The stochastic property makes evolutionary algorithms robust and adaptive enough to ...


D-Rdf: Dynamic Resource Description Framework, Kamna Jain Jan 2007

D-Rdf: Dynamic Resource Description Framework, Kamna Jain

Retrospective Theses and Dissertations

Semantic Web is described as the Web of Data, as opposed to the World Wide Web which is a Web of Documents. As research in the field of Semantic Web is gaining momentum, the focus is shifting on the effective representation of the data that constitutes the Semantic Web. RDF or the Resource Description Framework is the W3C standardized language for describing the semantics of the data and hence, sharing its meaning across applications. In RDF, all entities are modeled as resources and facts about these resources are asserted in terms of properties and their values.;In this thesis, we ...


Deepfreeze: A Management Interface For Iseage, Nathan Lyle Karstens Jan 2007

Deepfreeze: A Management Interface For Iseage, Nathan Lyle Karstens

Retrospective Theses and Dissertations

DeepFreeze is a framework designed to provide a unified command and control interface for the ISEAGE project. Besides being a graphical interface, it includes an extensive API and methodology for authoring and controlling applications executing within ISEAGE. It utilizes a wide array of technologies in the computing field to provide functions such as power management, efficient one-to-many communication, and fault tolerance for executing processes.;A concept application designed to aid in file distribution is presented. Also discussed are the modifications that were necessary to migrate the Traffic Mapper, a foundational component of ISEAGE, to the DeepFreeze environment.


Continuum: An Architecture For User Evolvable Collaborative Virtual Environments, Allen Bierbaum Jan 2007

Continuum: An Architecture For User Evolvable Collaborative Virtual Environments, Allen Bierbaum

Retrospective Theses and Dissertations

Continuum is a software platform for collaborative virtual environments. Continuum's architecture supplies a world model and defines how to combine object state, behavior code, and resource data into this single shared structure. The system frees distributed users from the constraints of monolithic centralized virtual world architectures and instead allows individual users to extend and evolve the virtual world by creating and controlling their own individual pieces of the larger world model. The architecture provides support for data distribution, code management, resource management, and rapid deployment through standardized viewers. This work not only provides this architecture, but it includes a ...


Suffix Trees And Suffix Arrays In Primary And Secondary Storage, Pang Ko Jan 2007

Suffix Trees And Suffix Arrays In Primary And Secondary Storage, Pang Ko

Retrospective Theses and Dissertations

In recent years the volume of string data has increased exponentially, and the speed at which these data is being generated has also increased. Some examples of string data includes biological sequences, internet webpages, and digitalized documents, to name a few. The indexing of biological sequence data is especially challenging due to the lack of natural word and sentence boundaries. Although many algorithms are able to deal with this lack of natural boundaries, they are not able to process the large quantity of data in reasonable time. To speed up the runtime of these algorithms, suffix trees and suffix arrays ...


Supervisory Control Of Discrete Event Systems For Bisimulation Or Simulation Equivalence, Changyan Zhou Jan 2007

Supervisory Control Of Discrete Event Systems For Bisimulation Or Simulation Equivalence, Changyan Zhou

Retrospective Theses and Dissertations

The supervisory control of discrete event systems provides a framework for control of event-driven systems. Applications of supervisory control theory include protocol design for communication processes, control logic synthesis in manufacturing systems, and collision avoidance in human-computer interaction systems.;When designing a system at a certain level of abstraction, lower level details of the system and its specification are normally omitted to obtain higher level models that may be (non-deterministic) event-driven systems. Nondeterministic systems exhibit both branching and sequential behaviors and are captured using bisimulation equivalence (the traditional language equivalence only captures sequential behaviors). Simulation equivalence is more expressive than ...


Techniques For Building A Scalable And Reliable Distributed Content-Based Publish/Subscribe System, Zhenhui Shen Jan 2007

Techniques For Building A Scalable And Reliable Distributed Content-Based Publish/Subscribe System, Zhenhui Shen

Retrospective Theses and Dissertations

No abstract provided.


Investment Planning Applied To Power Systems Using Real Options Analysis, Kory Walter Hedman Jan 2007

Investment Planning Applied To Power Systems Using Real Options Analysis, Kory Walter Hedman

Retrospective Theses and Dissertations

The electric industry has changed from a vertically integrated industry to a market based competitive industry. The incentives of market participants have changed and there is additional uncertainty since the industry is no longer vertically integrated. Traditional methods used in investment planning are no longer adequate; thus, improved methods are needed to provide a better valuation of investments. This research concentrates on transmission planning and real options analysis. The transmission planning research applies real options analysis and compares it to other approaches. Real options analysis is preferred as it can model the managerial flexibility that takes place in investment planning ...


Forensic Log Investigator (Fli): A Log Analysis And Visualization Tool, Thieu Van Tran Pham Jan 2007

Forensic Log Investigator (Fli): A Log Analysis And Visualization Tool, Thieu Van Tran Pham

Retrospective Theses and Dissertations

In a cyber crime investigation, investigators often have to examine and analyze log files. Due to the lack of standard format, they follow their own arbitrary formats which present a formidable challenge and complexity to analysis. Additionally, with these log files containing a huge number of log entries, it is difficult to extract and analyze the relevant evidential information efficiently and reliably. Since each log contains only a little information, a fragment of the whole, it is particularly beneficial for investigators to examine logs together. Visualization allows the investigator to correlate the information, see the patterns, and gain insight into ...


Electromagnetic Materials Characterization Of Ferromagnetic Composites At Microwave Frequencies, Eric Ryan Abram Jan 2007

Electromagnetic Materials Characterization Of Ferromagnetic Composites At Microwave Frequencies, Eric Ryan Abram

Retrospective Theses and Dissertations

No abstract provided.


Techniques In Placing Network Monitors, Yongping Tang Jan 2007

Techniques In Placing Network Monitors, Yongping Tang

Retrospective Theses and Dissertations

Network monitoring systems are important components to protect networks. Due to large amount of data captured by monitors and the economical and technical constraints in adding monitors into network, research in monitor placement techniques is critical in network security.;In this thesis, we first present a network monitor structure with the ability of data reduction to reduce the space requirement of monitor systems. Then we discuss the techniques for the optimal placement of passive monitors in AS level and router level topologies where there are constraints on the number of available monitors for deployment. Arithmetic coding is used in data ...


Assessment Of Nitrogen Supply From Poultry Manure Applied To Corn, Dorivar A. Ruiz Diaz Suarez Jan 2007

Assessment Of Nitrogen Supply From Poultry Manure Applied To Corn, Dorivar A. Ruiz Diaz Suarez

Retrospective Theses and Dissertations

No abstract provided.


Predicting The Dispersion And Viability Of Maize Pollen, Brian J. Viner Jan 2007

Predicting The Dispersion And Viability Of Maize Pollen, Brian J. Viner

Retrospective Theses and Dissertations

No abstract provided.


Ai Loom: A Generic Development Framework For Multi-Agent Systems Ideally Suited For Virtual Worlds, Joshua Luke Brown Jan 2007

Ai Loom: A Generic Development Framework For Multi-Agent Systems Ideally Suited For Virtual Worlds, Joshua Luke Brown

Retrospective Theses and Dissertations

This thesis discusses the use of a multiagent system as a framework for the development of a distributed virtual world. The research has resulted in the development of a distributed generic multiagent system called AI Loom and a prototype distributed virtual world called Plane. The discussion in this thesis focuses on the approach taken and the discussions made in the design and implementation of both of these technologies.


A Distributed System For Integrating And Sharing Biology Data And Tools, Mohammed Alabsi Jan 2007

A Distributed System For Integrating And Sharing Biology Data And Tools, Mohammed Alabsi

Retrospective Theses and Dissertations

During the last few years, the number and size of biological databases have increased dramatically. Existence of these databases has been significant to recent biological research, providing biologist with an increasingly large and valuable set of data. Still, current biological databases have some shortcomings. A single data source does not usually have all the data a biologist needs. Also, biological databases are normally subject specific, containing data about a certain biological discipline. Hence, providing biologists with a single source of data gathered from multiple sources and covering many subjects would provide them with the breadth and depth of data needed ...


Restricting Wireless Network Access Within The Classroom, Andrew Daniel Buschbom Jan 2007

Restricting Wireless Network Access Within The Classroom, Andrew Daniel Buschbom

Retrospective Theses and Dissertations

Wireless Local Area Networks (WLANs) are fast becoming the networks of choice. With the availability of cheap wireless solutions, WLANs are seeing exponential growth which is expected to continue in the years to come. Over 50% of college classrooms have wireless network availability. Instructors have discovered that along with the benefits of WLANs there are also many students misusing the wireless network during class. This paper provides a solution to the multiple access point problem and proposes a system that can be used to control wireless network access in the classroom. The wireless network control system is based off of ...


Soil Respiration And Plant Growth Across A Chronosequence Of Tallgrass Prairie Reconstructions, Ryan Matthew Maher Jan 2007

Soil Respiration And Plant Growth Across A Chronosequence Of Tallgrass Prairie Reconstructions, Ryan Matthew Maher

Retrospective Theses and Dissertations

An understanding of changes in soil respiration (Rs) and plant growth in tallgrass prairies planted into formerly cultivated land is critical if we are to predict the effects of grassland reconstructions on belowground carbon cycling. In addition, predicting changes in the ecosystem carbon balance in grassland reconstructions will require identifying the climatic and biological controls on Rs across a landscape of cultivated and reconstructed grassland ecosystems. This study used a 12 yr chronosequence of tallgrass prairie reconstructions in central Iowa, including a no-till soybean field (age 0), to quantify the relationship between tallgrass prairie age, R s, root biomass, root ...