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Articles 1891 - 1920 of 2733
Full-Text Articles in Computer Sciences
An Infrastructure For Performance Measurement And Comparison Of Information Retrieval Solutions, Gary Saunders
An Infrastructure For Performance Measurement And Comparison Of Information Retrieval Solutions, Gary Saunders
Theses and Dissertations
The amount of information available on both public and private networks continues to grow at a phenomenal rate. This information is contained within a wide variety of objects, including documents, e-mail archives, medical records, manuals, pictures and music. To be of any value, this data must be easily searchable and accessible. Information Retrieval (IR) is concerned with the ability to find and gain access to relevant information. As electronic data repositories continue to proliferate, so too, grows the variety of methods used to locate and access the information contained therein. Similarly, the introduction of innovative retrieval strategies—and the optimization of …
Multi-Class Classification For Identifying Jpeg Steganography Embedding Methods, Benjamin M. Rodriguez Ii
Multi-Class Classification For Identifying Jpeg Steganography Embedding Methods, Benjamin M. Rodriguez Ii
Theses and Dissertations
Over 725 steganography tools are available over the Internet, each providing a method for covert transmission of secret messages. This research presents four steganalysis advancements that result in an algorithm that identifies the steganalysis tool used to embed a secret message in a JPEG image file. The algorithm includes feature generation, feature preprocessing, multi-class classification and classifier fusion. The first contribution is a new feature generation method which is based on the decomposition of discrete cosine transform (DCT) coefficients used in the JPEG image encoder. The generated features are better suited to identifying discrepancies in each area of the decomposed …
On Autonomous Multi-Agent Control In Wilderness Search And Rescue: A Mixed Initiative Approach, Benjamin C. Hardin
On Autonomous Multi-Agent Control In Wilderness Search And Rescue: A Mixed Initiative Approach, Benjamin C. Hardin
Theses and Dissertations
Searching for lost people in a Wilderness Search and Rescue (WiSAR) scenario is a task that can benefit from large numbers of agents, some of whom may be robotic. These agents may have differing levels of autonomy, determined by the set of tasks they are performing. In addition, the level of autonomy that results in the best performance may change due to varying workload or other factors. Allowing a supervisor and a searcher to jointly decide the correct level of autonomy for a given situation (“mixed initiative”) results in better overall performance than giving an agent absolute control over their …
Predicting The Longevity Of Dvdr Media By Periodic Analysis Of Parity, Jitter, And Ecc Performance Parameters, Daniel Patrick Wells
Predicting The Longevity Of Dvdr Media By Periodic Analysis Of Parity, Jitter, And Ecc Performance Parameters, Daniel Patrick Wells
Theses and Dissertations
For the last ten years, DVD-R media have played an important role in the storage of large amounts of digital data throughout the world. During this time it was assumed that the DVD-R was as long-lasting and stable as its predecessor, the CD-R. Several reports have surfaced over the last few years questioning the DVD-R's ability to maintain many of its claims regarding archival quality life spans. These reports have shown a wide range of longevity between the different brands. While some DVD-Rs may last a while, others may result in an early and unexpected failure. Compounding this problem is …
Simple, Secure, Selective Delegation In Online Identify Systems, Bryant Gordon Cutler
Simple, Secure, Selective Delegation In Online Identify Systems, Bryant Gordon Cutler
Theses and Dissertations
The ability to delegate privileges to others is so important to users of online identity systems that users create ad hoc delegation systems by sharing authentication credentials if no other easy delegation mechanism is available. With the rise of internet-scale relationship-based single sign-on protocols like OpenID, the security risks of password sharing are unacceptable. We therefore propose SimpleAuth, a simple modification to relationship-based authentication protocols that gives users a secure way to selectively delegate subsets of their privileges, making identity systems more flexible and increasing user security. We also present a proof-of-concept implementation of the SimpleAuth pattern using the sSRP …
Using Live Sequence Chart Specifications For Formal Verification, Rahul Kumar
Using Live Sequence Chart Specifications For Formal Verification, Rahul Kumar
Theses and Dissertations
Formal methods play an important part in the development as well as testing stages of software and hardware systems. A significant and often overlooked part of the process is the development of specifications and correctness requirements for the system under test. Traditionally, English has been used as the specification language, which has resulted in verbose and difficult to use specification documents that are usually abandoned during product development. This research focuses on investigating the use of Live Sequence Charts (LSCs), a graphical and intuitive language directly suited for expressing communication behaviors of a system as the specification language for a …
Adapting Adtrees For Improved Performance On Large Datasets With High Arity Features, Robert D. Van Dam
Adapting Adtrees For Improved Performance On Large Datasets With High Arity Features, Robert D. Van Dam
Theses and Dissertations
The ADtree, a data structure useful for caching sufficient statistics, has been successfully adapted to grow lazily when memory is limited and to update sequentially with an incrementally updated dataset. However, even these modified forms of the ADtree still exhibit inefficiencies in terms of both space usage and query time, particularly on datasets with very high dimensionality and with high arity features. We propose five modifications to the ADtree, each of which can be used to improve size and query time under specific types of datasets and features. These modifications also provide an increased ability to precisely control how an …
Arbitrary Degree T-Splines, Gordon Thomas Finnigan
Arbitrary Degree T-Splines, Gordon Thomas Finnigan
Theses and Dissertations
T-Splines is a freeform surface type similar to NURBS, that allows partial rows of control points. Up until now, T-Splines have only been formally defined for the degree three case. This paper extends the definition to support all odd, even, and mixed degree T-Spline surfaces, making T-Splines a proper superset of all standard NURBS surfaces.
Reducing Seed Load In The Bittorrent File Sharing System, Brian T. Sanderson
Reducing Seed Load In The Bittorrent File Sharing System, Brian T. Sanderson
Theses and Dissertations
BitTorrent is an attractive peer-to-peer technology that attempts to reduce load on file sharers by allowing downloaders to share content between themselves. BitTorrent's current focus is to provide users with a fast download, which requires the file sharer to serve a disproportionate amount of the file. We present a modification to the BitTorrent seeding algorithm that reduces the load on BitTorrent file sharers. Essentially, if a block of a file is already available from a significant number of peers, the file sharer refuses to share that block, forcing peers to get it from each other. Using this modification, we show …
Developing Network Situational Awareness Through Visualization Of Fused Intrusion Detection System Alerts, Serafin A. Avitia V
Developing Network Situational Awareness Through Visualization Of Fused Intrusion Detection System Alerts, Serafin A. Avitia V
Theses and Dissertations
With networks increasing in physical size, bandwidth, traffic volume, and malicious activity, network analysts are experiencing greater difficulty in developing network situational awareness. Traditionally, network analysts have used Intrusion Detection Systems to gain awareness but this method is outdated when analysts are unable to process the alerts at the rate they are being generated. Analysts are unwittingly placing the computer assets they are charged to protect at risk when they are unable to detect these network attacks. This research effort examines the theory, application, and results of using visualizations of fused alert data to develop network situational awareness. The fused …
Hardware, Software And Data Analysis Techniques For Sram-Based Field Programmable Gate Array Circuits, Eugene B. Hockenberry
Hardware, Software And Data Analysis Techniques For Sram-Based Field Programmable Gate Array Circuits, Eugene B. Hockenberry
Theses and Dissertations
This work presents a built, tested, and demonstrated test structure that is low-cost, flexible, and re-usable for robust radiation experimentation, primarily to investigate memory, in this case SRAMs and SRAM-based FPGAs. The space environment can induce many kinds of failures due to radiation effects. These failures result in a loss of money, time, intelligence, and information. In order to evaluate technologies for potential failures, a detailed test methodology and associated structure are required. In this solution, an FPGA board was used as the controller platform, with multiple VHDL circuit controllers, data collection and reporting modules. The structure was demonstrated by …
Interactive Part Selection For Mesh And Point Models Using Hierarchical Graph-Cut Partitioning, Steven W. Brown
Interactive Part Selection For Mesh And Point Models Using Hierarchical Graph-Cut Partitioning, Steven W. Brown
Theses and Dissertations
This thesis presents a method for interactive part selection for mesh and point set surface models that combines scribble-based selection methods with hierarchically accelerated graph-cut segmentation. Using graph-cut segmentation to determine optimal intuitive part boundaries enables easy part selection on complex geometries and allows for a simple, scribble-based interface that focuses on selecting within visible parts instead of precisely defining part boundaries that may be in difficult or occluded regions. Hierarchical acceleration is used to maintain interactive speeds with large models and to determine connectivity when extending the technique to point set models.
A Secure And Efficient Communications Architecture For Global Information Grid Users Via Cooperating Space Assets, Victor P. Hubenko Jr.
A Secure And Efficient Communications Architecture For Global Information Grid Users Via Cooperating Space Assets, Victor P. Hubenko Jr.
Theses and Dissertations
With the Information Age in full and rapid development, users expect to have global, seamless, ubiquitous, secure, and efficient communications capable of providing access to real-time applications and collaboration. The United States Department of Defense’s (DoD) Network-Centric Enterprise Services initiative, along with the notion of pushing the “power to the edge,” aims to provide end-users with maximum situational awareness, a comprehensive view of the battlespace, all within a secure networking environment. Building from previous AFIT research efforts, this research developed a novel security framework architecture to address the lack of efficient and scalable secure multicasting in the low earth orbit …
An Analysis Of Botnet Vulnerabilities, Sean W. Hudson
An Analysis Of Botnet Vulnerabilities, Sean W. Hudson
Theses and Dissertations
Botnets are a significant threat to computer networks and data stored on networked computers. The ability to inhibit communication between servers controlling the botnet and individual hosts would be an effective countermeasure. The objective of this research was to find vulnerabilities in Unreal IRCd that could be used to shut down the server. Analysis revealed that Unreal IRCd is a very mature and stable IRC server and no significant vulnerabilities were found. While this research does not eliminate the possibility that a critical vulnerability is present in the Unreal IRCd software, none were identified during this effort.
Development Of A Night Vision Goggle Heads Up Display For Paratrooper Guidance, Fernando Ontiveros
Development Of A Night Vision Goggle Heads Up Display For Paratrooper Guidance, Fernando Ontiveros
Theses and Dissertations
This thesis provides the proof of concept for the development and implementation of a Global Positioning System (GPS) display via Night Vision Goggles (NVG) Heads-Up Display (HUD) for paratroopers. The system has been designed for soldiers who will be able to utilize the technology in the form of a processing system worn in an ammo pouch and displayed via NVG HUD as a tunnel in the sky. The tunnel in the sky display design is essentially a series of boxes displayed within the goggle's HUD leading the paratrooper to the desired Landing Zone (LZ). The algorithm developed receives GPS and …
Mitigating Reversing Vulnerabilities In .Net Applications Using Virtualized Software Protection, Matthew A. Zimmerman
Mitigating Reversing Vulnerabilities In .Net Applications Using Virtualized Software Protection, Matthew A. Zimmerman
Theses and Dissertations
Protecting intellectual property contained in application source code and preventing tampering with application binaries are both major concerns for software developers. Simply by possessing an application binary, any user is able to attempt to reverse engineer valuable information or produce unanticipated execution results through tampering. As reverse engineering tools become more prevalent, and as the knowledge required to effectively use those tools decreases, applications come under increased attack from malicious users. Emerging development tools such as Microsoft's .NET Application Framework allow diverse source code composed of multiple programming languages to be integrated into a single application binary, but the potential …
Ranking Search Results For Translated Content, Brian Edwin Hawkins
Ranking Search Results For Translated Content, Brian Edwin Hawkins
Theses and Dissertations
Translation Memory (TM) is a valuable tool that helps human translators in doing their job. TM consists of a collection of previously translated texts, called translation units, that may prove useful in the translation of new text. The main problem faced by translators who wish to take advantage of TM is that, although search tools do exist, there is no standardized way of effectively ranking search results. This thesis proposes a method for ranking TM search results together with a novel approach to efficiently finding common substrings that is used in the ranking process.
Machine Code Verification Using The Bogor Framework, Joseph R. Edelman
Machine Code Verification Using The Bogor Framework, Joseph R. Edelman
Theses and Dissertations
Verification and validation of embedded systems software is tedious and time consuming. Software model checking uses a tool-based approach automating this process. In order to more accurately model software it is necessary to provide hardware support that enables the execution of software as it should run on native hardware. Hardware support often requires the creation of model checking tools specific to the instruction set architecture. The creation of software model checking tools is non-trivial. We present a strategy for using an "off-the-shelf" model checking tool, Bogor, to provide support for multiple instruction set architectures. Our strategy supports key hardware features …
Personalized Web Search By Using Learned User Profiles In Re-Ranking, Jia Hu
Personalized Web Search By Using Learned User Profiles In Re-Ranking, Jia Hu
Theses and Dissertations
Search engines return results mainly based on the submitted query; however, the same query could be in different contexts because individual users have different interests. To improve the relevance of search results, we propose re-ranking results based on a learned user profile. In our previous work we introduced a scoring function for re-ranking search results based on a learned User Interest Hierarchy (UIH). Our results indicate that we can improve relevance at lower ranks, but not at the top 5 ranks. In this thesis, we improve the scoring function by incorporating new term characteristics, image characteristics and pivoted length normalization. …
Machine Learning For Host-Based Anomaly Detection, Gaurav Tandon
Machine Learning For Host-Based Anomaly Detection, Gaurav Tandon
Theses and Dissertations
Anomaly detection techniques complement signature based methods for intrusion detection. Machine learning approaches are applied to anomaly detection for automated learning and detection. Traditional host-based anomaly detectors model system call sequences to detect novel attacks. This dissertation makes four key contributions to detect host anomalies. First, we present an unsupervised approach to clean training data using novel representations for system call sequences. Second, supervised learning with system call arguments and other attributes is proposed for enriched modeling. Third, techniques to increase model coverage for improved accuracy are presented. Fourth, we propose spatio-temporal modeling to detect suspicious behavior for mobile hosts. …
Automating Mini-Ontology Generation From Canonical Tables, Stephen G. Lynn
Automating Mini-Ontology Generation From Canonical Tables, Stephen G. Lynn
Theses and Dissertations
In this thesis work we develop and test MOGO (a Mini-Ontology GeneratOr.) MOGO automates the generation of mini-ontologies from canonicalized tables of data. This will help anyone trying to organize large amounts of existing data into a more searchable and accessible form. By using a number of different heuristic rules for selecting, enhancing, and modifying ontology elements, MOGO allows users to automatically, semi-automatically, or manually generate conceptual mini-ontologies from canonicalized tables of data. Ideally, MOGO operates fully automatically while allowing users to intervene to direct and correct when necessary so that they can always satisfactorily complete the translation of canonicalized …
Improving Spreadsheets For Complex Problems, Brian C. Whitmer
Improving Spreadsheets For Complex Problems, Brian C. Whitmer
Theses and Dissertations
Spreadsheets are one of the most frequently used applications. They are used because they are easy to understand and values can be updated easily. However, many people try to use spreadsheets for problems beyond their intended scope and end up with errors and miscalculations. We present a new spreadsheet system which uses complex-values and equation code reuse to overcome the limitations of spreadsheets for complex problems. We also discuss the features necessary in order to make these enhancements useful and effective.
Generalized Constrained Interpolation, Jacob Porter Merrell
Generalized Constrained Interpolation, Jacob Porter Merrell
Theses and Dissertations
Interpolation is essential in digital image processing, especially magnification. Many different approaches to interpolation specific to magnification have been developed in an effort to overcome the shortcomings of bilinear and bicubic interpolation. One of these approaches, Constraint-Based Interpolation, produces an image that is free of jaggies and has less blurring than bilinear or bicubic interpolation. Although Constraint-Based Interpolation produces a visually pleasing image, there are user-chosen parameters that make the algorithm difficult to use. In this thesis we propose a method for automatic selection of those parameters and an extension of Constraint-Based Interpolation to other forms of image manipulation, such …
Increasing Dogma Scaling Through Clustering, Nathan Hyrum Ekstrom
Increasing Dogma Scaling Through Clustering, Nathan Hyrum Ekstrom
Theses and Dissertations
DOGMA is a distributed computing architecture developed at Brigham Young University. It makes use of idle computers to provide additional computing resources to applications, similar to Seti@home. DOGMA's ability to scale to large numbers of computers is hindered by its strict client-server architecture. Recent research with DOGMA has shown that introducing localized peer-to-peer downloading abilities enhances DOGMA's performance while reducing the amount of network and server usage. This thesis proposes to further extend the peer-to-peer abilities of DOGMA to include peering client server communication by creating dynamic clusters of clients. The client clusters aggregate their communication with only one client …
Using Hierarchical Temporal Memory For Detecting Anomalous Network Activity, Gerod M. Bonhoff
Using Hierarchical Temporal Memory For Detecting Anomalous Network Activity, Gerod M. Bonhoff
Theses and Dissertations
This thesis explores the nature of cyberspace and forms an argument for it as an intangible world. This research is motivated by the notion of creating intelligently autonomous cybercraft to reside in that environment and maintain domain superiority. Specifically, this paper offers 7 challenges associated with development of intelligent, autonomous cybercraft. The primary focus is an analysis of the claims of a machine learning language called Hierarchical Temporal Memory (HTM). In particular, HTM theory claims to facilitate intelligence in machines via accurate predictions. It further claims to be able to make accurate predictions of unusual worlds, like cyberspace. The research …
A Tool To Support Ontology Creation Based On Incremental Mini-Ontology Merging, Zonghui Lian
A Tool To Support Ontology Creation Based On Incremental Mini-Ontology Merging, Zonghui Lian
Theses and Dissertations
This thesis addresses the problem of tool support for semi-automatic ontology mapping and merging. Solving this problem contributes to ontology creation and evolution by relieving users from tedious and time-consuming work. This thesis shows that a tool can be built that will take a “mini-ontology” and a “growing ontology” as input and make it possible to produce manually, semi-automatically, or automatically an extended growing ontology as output. Characteristics of this tool include: (1) a graphical, interactive user interface with features that will allow users to map and merge ontologies, and (2) a framework supporting pluggable, semi-automatic, and automatic mapping and …
What Constitutes An Act Of War In Cyberspace, Kelli S. Kinley
What Constitutes An Act Of War In Cyberspace, Kelli S. Kinley
Theses and Dissertations
In December 2005 a new mission statement was released by the Air Force Leadership, "to deliver sovereign options for the defense of the United States of America and its global interests...to fly and fight in Air, Space and Cyberspace." (Wynne & Mosley, 2005) With the stand up of the AFCYBER command and the use of cyberspace to carry out our daily mission the U.S. needs to have a clear understanding of what war in cyberspace looks like and what the laws are governing war in cyberspace. This research and it's resulting data analysis is intended to provide a better understanding …
Comparing Information Assurance Awareness Training For End-Users: A Content Analysis Examination Of Air Force And Defense Information Systems Agency User Training Modules, John W. Frugé
Theses and Dissertations
Today, the threats to information security and assurance are great. While there are many avenues for IT professionals to safeguard against these threats, many times these defenses prove useless against typical system users. Mandated by laws and regulations, all government agencies and most private companies have established information assurance (IA) awareness programs, most of which include user training. Much has been given in the existing literature to laying out the guidance for the roles and responsibilities of IT professionals and higher level managers, but less is specified for "everyday" users of information systems. This thesis attempts to determine the content …
A Delphi Study Assessing Long-Term Access To Electronic Medical Records (Emr), Byron D. Nicholson
A Delphi Study Assessing Long-Term Access To Electronic Medical Records (Emr), Byron D. Nicholson
Theses and Dissertations
This research effort addressed the issue of long-term access to electronic medical records as technological generations become obsolete, thereby preventing the access to patient health information. Using the Delphi methodology, experts with experience in electronic medical records and applicable systems provided insight based on their years of hands-on experience managing and/or using records and these systems. The end result of this research was a collection of ideas that medical institutions and medical informaticians must consider to ensure that patients and hospitals do not lose long-term access to electronic medical records as electronic medical records and technology continually evolves. Results of …
Suspicion Modeling In Support Of Cyber-Influence Operations/Tactics, Henry G. Paguirigan
Suspicion Modeling In Support Of Cyber-Influence Operations/Tactics, Henry G. Paguirigan
Theses and Dissertations
Understanding the cognitive process of IT user suspicion may assist organizations in development of network protection plans, personnel training, and tools necessary to identify and mitigate nefarious intrusions of IT systems. Exploration of a conceptual common ground between psycho-social and technology-related concepts of suspicion are the heart of this investigation. The complexities involved in merging these perspectives led to the overall research question: What is the nature of user suspicion toward IT: The research problem/phenomenon was addressed via extensive literature review, and use of the Interactive Qualitative Analysis problem/phenomenon. Analysis of the system led to the development of a model …