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Information Theoretic, Probabilistic And Maximum Partial Substructure Algorithms For Discovering Graph-Based Anomalies, William Fred Eberle May 2007

Information Theoretic, Probabilistic And Maximum Partial Substructure Algorithms For Discovering Graph-Based Anomalies, William Fred Eberle

Computer Science and Engineering Dissertations - Archive

The ability to mine data represented as a graph has become important in several domains for detecting various structural patterns. One important area of data mining is anomaly detection, particularly for fraud. However, less work has been done in terms of detecting anomalies in graph-based data. While there has been some previous work that has used statistical metrics and conditional entropy measurements, the results have been limited to certain types of anomalies and specific domains. In this work we present graph-based approaches to uncovering anomalies in domains where the anomalies consist of unexpected entity/relationship alterations that closely resemble non-anomalous behavior. …

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Flash Crowd Mitigation System, Dongchul Kim May 2007

Flash Crowd Mitigation System, Dongchul Kim

Computer Science and Engineering Theses - Archive

Flash crowd means that a web server suffers a sudden surge of traffic since a large number of Internet users access the web server simultaneously. Once a flash crowd occurs in a web server, the response rate for the HTTP requests decreases rapidly, or the web server may even crash. To protect the web server from such flash crowds, in this paper, we propose the Flash Crowd Mitigation System (FCMS) which is based on the cooperation of the web servers and the redirection of the HTTP request. In FCMS, when a flash crowd is predicted by the traffic monitoring module …

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Wildcat: An Integrated Stealth Environment For Dynamic Malware Analysis, Amit Vasudevan May 2007

Wildcat: An Integrated Stealth Environment For Dynamic Malware Analysis, Amit Vasudevan

Computer Science and Engineering Dissertations - Archive

Malware -- a term that refers to viruses, trojans, worms, spyware or any form of malicious code -- is widespread today. Given the devastating effects that malware have on the computing world, detecting and countering malware is an important goal. Malware analysis is a challenging and multi-step process providing insight into malware structure and functionality, facilitating the development of an antidote. To successfully detect and counter malware, malware analysts must be able to analyze them in binary, in both a coarse- (behavioral) and fine-grained (structural) fashion. However, current research in coarse- and fine-grained code analysis (categorized into static and dynamic) …

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New Equilibria For Noncooperative Games, Phantipa Insuwan May 2007

New Equilibria For Noncooperative Games, Phantipa Insuwan

Industrial, Manufacturing, and Systems Engineering Dissertations - Archive

In this dissertation we present an alternative to the Nash Equilibrium (NE), which is regarded as the fundamental solution concept in game theory. An NE provides a solution in which no player can improve his payoff by unilaterally changing strategies. However, the NE has weaknesses as exemplified by the paradoxical Prisoner's Dilemma game, where the unique NE is dominated by another possible outcome. Moreover, an NE assumes all players select their strategies according to the same NE so equilibrium holds. For multiple NE's, no standard approach exists for selecting a single one, though various refinements such as perfect Nash equilibria …

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Design, Fabrication And Assembly Of 3-D Microstructures, Ping Zhang May 2007

Design, Fabrication And Assembly Of 3-D Microstructures, Ping Zhang

Electrical Engineering Dissertations - Archive

The primary goal of a micro-electro-mechanical system (MEMS) is to integrate electronics, sensors and actuators into a tiny system, which can be easily fabricated and packaged. Currently there is no standard process for manufacturing all the sub-components since a lot of them are made from different materials and fabrication technologies. Therefore, there is a great interest to develop a reliable manufacturing approach that allows for the integration of multiple micro devices on a single chip. This work describes two approaches to achieve this heterogeneous integration: (1) hybrid material integration by introducing new materials into a well-known self-assembly platform (PolyMUMPs) to …

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Heros: A Patient-Centered Goal-Directed Electronic Medical Record System For The Homeless, Kallol Silas Mahata May 2007

Heros: A Patient-Centered Goal-Directed Electronic Medical Record System For The Homeless, Kallol Silas Mahata

Computer Science and Engineering Theses - Archive

Homelessness is a growing problem in the United States. Numerous barriers keep the street homeless from obtaining healthcare. Medical Street Outreach (MSO) programs are designed to reach out to the homeless. Gathering relevant clinical information on the streets is difficult, and carrying paper records in MSO is cumbersome and inefficient. Several complex healthcare record systems have been developed for hospitals, but no such system exists for collecting health data on the streets. In this thesis, we describe a light weight Electronic Medical Record (EMR), called HEROS (Homeless Electronic RecOrd System) that we have built to address the process of healthcare …

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Medical Decision Support System Using Augmentable Guideline Engine, Adetayo Afolabi Aiyedun May 2007

Medical Decision Support System Using Augmentable Guideline Engine, Adetayo Afolabi Aiyedun

Computer Science and Engineering Theses - Archive

Increasing life expectancy accompanied by existing growth of wireless infrastructure and ubiquitous computing technologies has given healthcare providers access to vital information within their healthcare networks. Medical decision support systems (MDSS) play an increasingly important role in medical practice by assisting physicians with making clinical decisions. MDSS are interactive computer programs, which are designed to assist physicians and other health professionals with decision making. Currently, the strategies for providing MDSS has failed, in part, because they have not provided a secure, timely access to information that is current, ability to modify their knowledge base without hard coding them in their …

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Efficient Multi-View Video Coding Scheme Based On Dynamic Video Object Segmentation, Xiaohui Wei May 2007

Efficient Multi-View Video Coding Scheme Based On Dynamic Video Object Segmentation, Xiaohui Wei

Computer Science and Engineering Dissertations - Archive

Multi-view video, which simultaneously acquires multiple video sequences from multiple viewpoints or view directions, is poised to become the next generation video technology. Exploiting redundancy is the hallmark of traditional video coding but is even more essential in multi-view video coding (MVC) where the data size is extremely large. The exploitation of additional redundancies, however, incurs extra computational overhead, thereby counteracting the benefits gained from coding efficiency. This dissertation proposes an efficient MVC scheme that provides a complete encoding solution with low complexity. This includes exploitation of inter- and intra-view redundancies for achieving high coding efficiency, and exploitation of inter-view …

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Efficient Visualization Of Streaming Sensor Network Data Using Approximation Technique, Sunil Pai May 2007

Efficient Visualization Of Streaming Sensor Network Data Using Approximation Technique, Sunil Pai

Computer Science and Engineering Theses - Archive

By commanding a large number of wireless sensor nodes capable of sensing, communicating, and computing, wireless sensor networks have revealed their vast potential in a plethora of applications. However, due to the stringent resources limitations on each sensor node ranging from energy and computation to network bandwidth and storage, efficient and light weight systems must be designed in order to accommodate the resource limited environment. Furthermore, due to the potentially large number of sensor nodes deployed, the amount of sensory data gathered therein can be overwhelming for processing and visualizing in a resource limited central controller, such as mobile devices. …

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Hiearchical Overlay For Service Composition In Pervasive Environments, Aparna Kailas May 2007

Hiearchical Overlay For Service Composition In Pervasive Environments, Aparna Kailas

Computer Science and Engineering Theses - Archive

The objective of pervasive computing is to allow users to perform their tasks in a transparent way regardless of device features. Resources on devices should be exploited to provide services in order to perform user tasks. When there is no exact match for the user task in the environment, the capabilities of available devices should be combined to perform the user task. Seamless Service Composition (SeSCo) abstracts device capabilities as services and leverages existing work on graph algorithms to perform service composition. A lightweight framework, PerSON (Service Overlay Network for Pervasive Environments) was developed to provide a service overlay network …

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A Dynamic Framework For Testing The Synchronization Behavior Of Java Monitors, Andres Yanes May 2007

A Dynamic Framework For Testing The Synchronization Behavior Of Java Monitors, Andres Yanes

Computer Science and Engineering Theses - Archive

A Java monitor is a specialized class that is used to synchronize the behavior of threads in a Java program. The monitors in a Java program must be adequately tested to ensure the correctness of the program. In this thesis we propose a dynamic framework in which a Java monitor is tested by exploring its state space in a depth-first manner. The state exploration procedure consists of dynamically creating method sequences to exercise the possible synchronization behavior of the monitor. During exploration, new threads will be created on the fly to simulate different scenarios that result from threads reaching the …

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Runway Incursion Mitigation, Capacity Enhancement, And Safety Improvements With Perimeter Taxiway Operations At Dallas Fort Worth International Airport, Satyamangalam D. Satyamurti May 2007

Runway Incursion Mitigation, Capacity Enhancement, And Safety Improvements With Perimeter Taxiway Operations At Dallas Fort Worth International Airport, Satyamangalam D. Satyamurti

Civil Engineering Dissertations - Archive

A perimeter taxiway (PT) or end-around taxiway (EAT) operation is a new concept being developed at several airports around the country to eliminate active departure runway incursions during peak periods. PTs will enhance capacity by permitting uninterrupted, safe, continuous takeoffs and landings within the operations framework and guidelines established by the Federal Aviation Administration (FAA). For this research, the Dallas/Fort Worth International Airport's (DFW) proposed PT operations are considered for analysis and evaluation. This concept is tested using actual historical flight data at DFW for simulation and analytical modeling based on the FAA safety factors available in the Visual SIMMOD …

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Thermal Effects On Analog Integrated Circuit Design, Md Mahbub Hossain May 2007

Thermal Effects On Analog Integrated Circuit Design, Md Mahbub Hossain

Electrical Engineering Dissertations - Archive

Analog Integrated Circuit design (IC) is a big challenge in this modern age. Thermal effect has a substantial role in analog ICs performance. Thermal effects on analog IC design have been investigated in this dissertation project. National Semiconductor Corporation's Vertical Bipolar Inter-Company (VBIC) model of dielectrically isolated bipolar junction transistors (DIBJT) with VIP10 and VIP11 processes have been used for the research. These devices are used for the high speed IC design. Self-heat generated inside these devices is confined within the device and degrades the device performance. In addition, the thermal characteristic of a device surrounded by the multiple adjacent …

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Analysis Of Tapered Laminated Composite Tubes Under Tension And Torsion, Chethana Shankara Rao May 2007

Analysis Of Tapered Laminated Composite Tubes Under Tension And Torsion, Chethana Shankara Rao

Mechanical and Aerospace Engineering Theses - Archive

Closed form expressions for determining the displacement and twisting angle of tapered composite tubes are developed. The analytical expressions are developed based on the modified laminated plate theory which includes the tubular wall curvature of the laminate. It is found that the axial deformation and the twisting angle calculated by the current method agree well with the results obtained from the finite element method. The effect of stacking sequence, taper angle and fiber orientations on the axial deformation and twisting angle are studied by using the developed method. It is found that the taper angle plays a significant role on …

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Permeability Of Municipal Solid Waste In Bioreactor Landfill With Degradation, Kiran Kumar Penmethsa May 2007

Permeability Of Municipal Solid Waste In Bioreactor Landfill With Degradation, Kiran Kumar Penmethsa

Civil Engineering Theses - Archive

Bioreactor landfills are operated and controlled to accelerate refuse decomposition, gas production and biological stabilization of the municipal solid waste (MSW). Leachate recirculation in bioreactor landfill creates a favorable environment for rapid microbial decomposition of the biodegradable components of solid waste. Therefore, clear understanding of the mechanism of moisture movement within the solid waste would be necessary for successful design and operation of the bioreactor landfill. Permeability is an important parameter during the design of leachate collection and recirculation system. In the current study an experimental program was designed to determine the variation of coefficient of permeability of MSW with …

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Autotrophic Denitrification Of Groundwater In A Granular Sulfur-Packed Up-Flow Reactor, Shih-Hui Pan May 2007

Autotrophic Denitrification Of Groundwater In A Granular Sulfur-Packed Up-Flow Reactor, Shih-Hui Pan

Civil Engineering Dissertations - Archive

Autotrophic denitrification is an effective treatment technique for nitrate removal from groundwater. Six basic elements are required for the growth of autotrophic denitrifiers: (1) electron donor, (2) electron acceptor, (3) active bacteria, (4) anoxic/anaerobic environment, (5) micronutrients, and (6) optimum pH and temperature. In this research, granular sulfur is an electron donor; nitrate is an electron acceptor; anoxic and anaerobic environment was maintained in the reactor, and micronutrients were added; pH was controlled between 6 and 9, and temperature was maintained at the room temperature (20 + 2 oC). Batch reactor and continuous up-flow reactor experiments were carried out to …

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Ut Arlington Library Notes, V.13, No.1, Spring 2007, University Of Texas At Arlington Library May 2007

Ut Arlington Library Notes, V.13, No.1, Spring 2007, University Of Texas At Arlington Library

UT Arlington Library Notes

Former publication of the UT Library intended to foster community support and appreciation for Library Programs and services and to spotlight grants and contributions. It was published during the 1990s and 2000s.

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Improved Refinement Coefficients' Coding In Scalable H.264, Rahul Panchal Apr 2007

Improved Refinement Coefficients' Coding In Scalable H.264, Rahul Panchal

Electrical Engineering Theses - Archive

This thesis proposes to replace the adaptation used to select VLC table for coding of the refinement coefficient by signaling to the decoder which table should be used for which macroblock type (Inter or Intra) in scalable H.264. This part of the proposal aims at reducing decoder complexity and ensuring proper table selection when both macroblock types are present within one slice. The contribution further proposes to extend the method used in SVC to increase coding efficiency of CABAC refinement coefficient coding to "VLC" refinement coefficients coding. All the coding tools are integrated into JSVM_7_10 and the performance is tested. …

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Multiplexing H.264 Video With Aac Audio Bit Streams, Demultiplexing And Achieving Lip Synchronization During Playback, Harishankar Murugan Apr 2007

Multiplexing H.264 Video With Aac Audio Bit Streams, Demultiplexing And Achieving Lip Synchronization During Playback, Harishankar Murugan

Electrical Engineering Theses - Archive

H.264, MPEG-4 part-10 or AVC [5], is the latest digital video codec standard which has proven to be superior than any early standards in terms of compression ratio, quality, bit rates and error resilience. However, the standard just defines a video codec and has no mention of any audio compression. In order to have a meaningful delivery of the video to the end user, we need to associate an audio stream along with it. AAC (advanced audio coding) [1] is the latest digital audio codec standard defined in MPEG-2 and later in MPEG-4 with few changes. The audio quality of …

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Transcoding From H264 Bitstream To Mpeg-2 Bitstream, Sreejana Sharma Apr 2007

Transcoding From H264 Bitstream To Mpeg-2 Bitstream, Sreejana Sharma

Electrical Engineering Theses - Archive

H.264/AVC was recently developed by the JVT (Joint Video Team). This new standard fulfills significant coding efficiency, simple syntax specifications and seamless integration of video coding into all current protocols and multiplex architectures. The H.264 specification represents a significant advancement in the field of video coding technology by providing MPEG-2 comparable video quality at an average of half the required bandwidth. Since widespread use of H.264 is anticipated, many legacy systems including all Digital TVs and home receivers use MPEG-2. This leads to the need for an efficient architecture that significantly employs the lower cost of H.264 video and does …

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A Piecewise Linear Classifier, Abdul Aziz Abdurrab Apr 2007

A Piecewise Linear Classifier, Abdul Aziz Abdurrab

Electrical Engineering Theses - Archive

A piecewise linear network is discussed which classifies N-dimensional input vectors. The network uses a distance measure to assign incoming input vectors to an appropriate cluster. Each cluster has a linear classifier for generating class discriminants. A training algorithm is described for generating the clusters and discriminants. A pruning algorithm is also described. The algorithm is applied after the network has grown completely, i.e, it has achieved the maximum number of clusters. The pruning algorithm eliminates the least important clusters, one at a time, leading to a more compact network. Theorems are given which relate the network's performance to that …

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Operations-Oriented Performance Measures For Freeway Management Systems: Year 1 Report, Robert E. Brydia, William H. Schneider, Stephen P. Mattingly, Melanie L. Sattler, Auttawit Upayokin Apr 2007

Operations-Oriented Performance Measures For Freeway Management Systems: Year 1 Report, Robert E. Brydia, William H. Schneider, Stephen P. Mattingly, Melanie L. Sattler, Auttawit Upayokin

Civil Engineering Faculty Publications - Archive

This report describes the year 1 activities on the project titled “Using Operations-Oriented Performance Measures to Support Freeway Management Systems.” Work activities included a comprehensive statewide survey on the use of performance measurement, as well as the initial recommendation on both operations and emissions-oriented performance measures to use in support of daily operations.

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Stated Preference Modeling And Analysis Of Managed Lanes, Kaveh Farokhi Sadabadi Apr 2007

Stated Preference Modeling And Analysis Of Managed Lanes, Kaveh Farokhi Sadabadi

Civil Engineering Theses - Archive

The thesis deals with the Managed Lanes demand estimation problem in the state of Texas. Managed Lanes are a general type of High Occupancy Toll roads, whose lane management and operational features may be dynamically adjusted. A stated preference survey is designed in both English and Spanish to collect the required data. Each survey taker is presented with up to four scenarios. Scenarios are defined in terms of travel times in Managed Lanes versus General Purpose Lanes, as well as, the toll charged for access to the Managed Lane. Respondents were asked to choose among three modes and two lane …

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Computing Best Coverage Path In The Presence Of Obstacles In Wireless Sensor Networks, Senjuti Basu Roy Apr 2007

Computing Best Coverage Path In The Presence Of Obstacles In Wireless Sensor Networks, Senjuti Basu Roy

Computer Science and Engineering Theses - Archive

Given a set S = {S1,...,Sn} of n homogeneous wireless sensors deployed in a two dimensional area, a source point s and a destination point t, the least protected point p along a path (s,t) is that point such that the Euclidean distance between p and its closest sensor node Si is maximum. This distance between p and S_{i} is called the Cover value of the path P(s,t). The Best Coverage Path between s and t, denoted as BCP(s,t), is the path that has the minimum cover value. Although there exists efficient algorithms to compute BCP in O(n log n) …

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A Random Walk Approach To Sampling Hidden Databases, Arjun Dasgupta Apr 2007

A Random Walk Approach To Sampling Hidden Databases, Arjun Dasgupta

Computer Science and Engineering Theses - Archive

A large part of the data on the World Wide Web is hidden behind form-like interfaces. These interfaces interact with a hidden back-end database to provide answers to user queries. Generating a uniform random sample of this hidden database by using only the publicly available interface gives us access to the underlying data distribution. In this thesis, we propose a random walk scheme over the query space provided by the interface to sample such databases. We discuss variants where the query space is visualized as a fixed and random ordering of attributes. We also propose techniques to further improve the …

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A Functional Link Network Using Ordered Basis Functions, Saurabh Sureka Apr 2007

A Functional Link Network Using Ordered Basis Functions, Saurabh Sureka

Electrical Engineering Theses - Archive

A new function approximation and classification network based on Functional Link Network (FLN) with orthonormal Polynomial Basis Functions (PBF) is presented. By using an iterative Gram-Schmidt procedure, the PBF's are orthonormalized, ordered and selected based on their contribution to minimize the Mean Square Error (MSE). Linearly dependent and less useful PBF are detected and eliminated at an early stage thereby improving the approximation capabilities and reducing the possibility of combinatorial explosion. The number of passes through the data during network training is minimized through the use of correlations. A one-pass method is used for validation and network sizing. Equivalent function …

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Rf Sputtered Sixge1-X And Sixge1-Xoy Thin Films For Uncooled Infrared Detectors, Mukti M. Rana Mar 2007

Rf Sputtered Sixge1-X And Sixge1-Xoy Thin Films For Uncooled Infrared Detectors, Mukti M. Rana

Electrical Engineering Dissertations - Archive

The objective of this work is to find a suitable combination of radio frequency (RF) sputtered SixGe1-x and SixGe1-xOy thin films for uncooled infrared detection. Thus, fabricating and characterizing microbolometers with SixGe1-x and SixGe1-xOy thin films as the sensing material are the ultimate goal of this work. Thin films of SixGe1-x and SixGe1-xOy were deposited by RF magnetron sputtering at room temperature from a single target of SixGe1-x in Ar or Ar : O2 environment. The silicon and oxygen concentrations were varied in a parametric investigation of the dependence of the electrical and optical characteristics of the thin films on …

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Dynamic Voltage Restorer For Sensitive Equipment, Yea Zong Kuo Mar 2007

Dynamic Voltage Restorer For Sensitive Equipment, Yea Zong Kuo

Electrical Engineering Dissertations - Archive

Voltage sags are considered to be the most frequent type of disturbances in the field based on recent power disturbances studies. Their impact on sensitive loads is severe. The impact ranges from load disruptions to substantial economic losses. Despite the technical advances in electronics, there are still some pieces of equipment that are so sensitive that they are unable to withstand voltage sags. An example is the equipment in semiconductor manufacturing. As a result, there is still a search for different ways to manage voltage sags. There are many different methods to mitigate voltage sags, but a CUstom Power Supply …

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Issues In Front-End Engineering Of Cmos Nanoelectronics, Xiaolong Yang Mar 2007

Issues In Front-End Engineering Of Cmos Nanoelectronics, Xiaolong Yang

Electrical Engineering Dissertations - Archive

Several issues exist in current CMOS front-end engineering such as interfacial layer formation at high-k/Si interface, high metal/Si contact resistance in source and drain regions, and absence of a quantitative model for silicon-germanium alloy growth. In this dissertation, monolayer Se passivation is employed to create a Si (100) surface free of dangling bonds. Since dangling bonds are the origins of surface reaction sites and surface states, interfacial layer formation at high-k/Si interface can be suppressed and metal/Si contact resistance can be lowered by Se passivation. Firstly, results on interface engineering between HfO2 and n-type Si (100) with Se passivation are …

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Inference Of Node And Edge Replacement Graph Grammars, Jacek Kukluk Feb 2007

Inference Of Node And Edge Replacement Graph Grammars, Jacek Kukluk

Computer Science and Engineering Dissertations - Archive

In this dissertation we study the inference of node and edge replacement graph grammars. The approach is based on previous research in frequent isomorphic subgraphs discovery. We extend the search for frequent subgraphs by checking for overlap among the instances of the subgraphs in the input graph. If subgraphs overlap by one node, we propose a node replacement graph grammar production. If subgraphs overlap by two nodes or two nodes and an edge, we propose an edge replacement graph grammar production. We also can infer a hierarchy of productions by compressing portions of a graph described by a production and …

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