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Articles 2191 - 2220 of 2733
Full-Text Articles in Computer Sciences
Improving Tcp Performance By Estimating Errors In A Long Delay, High Error Rate Environment, Stephanie E. Carroll
Improving Tcp Performance By Estimating Errors In A Long Delay, High Error Rate Environment, Stephanie E. Carroll
Theses and Dissertations
Interest in finding methods of improving TCP performance over satellite and wireless networks is high. This has been an active area of research within the networking community. This research develops an algorithm, CETEN-R for TCP to determine if a particular packet is lost due to congestion or corruption and react accordingly. An analysis of the performance of CETEN-R under a variety of conditions is studied and then compared to TCP Reno and TCP New Reno. When delay is high and the error rate is high CETEN-R showed a 77.5% increase in goodput over TCP New Reno and a 33.8% increase …
Reduced Index Sparse Representation In A Parallel Environment, Pedro Alfonso Escallon
Reduced Index Sparse Representation In A Parallel Environment, Pedro Alfonso Escallon
Theses and Dissertations
Sparse-matrix/dense-vector multiplication algorithms are not as highly developed as algorithms for dense matrices. Dense matrix multiplication algorithms have been made efficient by exploiting data locality, parallelism, pipelining, and other types of optimization. Sparse matrix algorithms, on the other hand, encounter low or no data locality, indirect addressing, and no easy way to exploit parallelism. In an effort to achieve savings in storage and computational time, the topic of sparse matrix representation is often revisited. The first contribution of this thesis is the introduction of a new representation for sparse matrices. This representation is called here the Reduced Index Sparse (RIS) …
Load Balancing Parallel Explicit State Model Checking, Rahul Kumar
Load Balancing Parallel Explicit State Model Checking, Rahul Kumar
Theses and Dissertations
This research first identifies some of the key concerns about the techniques and algorithms developed for distributed and parallel model checking; specifically, the inherent problem with load balancing and large queue sizes resultant in a static partition algorithm. This research then presents a load balancing algorithm to improve the run time performance in distributed model checking, reduce maximum queue size, and reduce the number of states expanded before error discovery. The load balancing algorithm is based on Generalized Dimension Exchange (GDE). This research presents an empirical analysis of the GDE based load balancing algorithm on three different supercomputing architectures---distributed memory …
Solving Large Mdps Quickly With Partitioned Value Iteration, David Wingate
Solving Large Mdps Quickly With Partitioned Value Iteration, David Wingate
Theses and Dissertations
Value iteration is not typically considered a viable algorithm for solving large-scale MDPs because it converges too slowly. However, its performance can be dramatically improved by eliminating redundant or useless backups, and by backing up states in the right order. We present several methods designed to help structure value dependency, and present a systematic study of companion prioritization techniques which focus computation in useful regions of the state space. In order to scale to solve ever larger problems, we evaluate all enhancements and methods in the context of parallelizability. Using the enhancements, we discover that in many instances the limiting …
Quantifying Software Maintainability On Re-Engineered Translation Of Fortran To C++ Code, Zane Grey Tomlinson Jr.
Quantifying Software Maintainability On Re-Engineered Translation Of Fortran To C++ Code, Zane Grey Tomlinson Jr.
Theses and Dissertations
Due to the expanding existence of old software, legacy systems, and obsolete platforms with many industries, software re-engineering has become a widespread methodology that assists engineers and software practitioners with translating inflexible, unsupportable legacy software into maintainable software. Many companies today are investing in a variety of re-engineering techniques such as translation of source code to new code structures and target platforms to ensure future software maintenance can be performed in an efficient and effective manner. With sound re-engineering principles, the application of these techniques leverage the knowledge and previous engineering endeavors to mitigate risks and provide adequate performance to …
On The Effects Of Device Mobility Upon Resource-Sharing In A Simulated Wireless Grid Network, Arris Ray
On The Effects Of Device Mobility Upon Resource-Sharing In A Simulated Wireless Grid Network, Arris Ray
Theses and Dissertations
The primary aim of modern computer networks is to permit simplified sharing of resources (e.g., files and data) or to provide access to remote resources (e.g., printers or remote file-systems). Grid networks aim to provide a more sophisticated framework for securely sharing, selecting and/or aggregating a wide-variety of remote resources, whether logical (e.g., files and data) or physical (e.g., remote sensors, processing power or disk storage space). Provided that circuit design continues to improve at the relatively steady pace that it has for the past decade, in addition to standard desktop systems, miniature and mobile devices will soon become substantially …
Mool: An Object-Oriented Programming Language With Generics And Modules., María Lucía Barrón Estrada
Mool: An Object-Oriented Programming Language With Generics And Modules., María Lucía Barrón Estrada
Theses and Dissertations
Modern object-oriented languages like Java and C# do not support parametric polymorphism and do not have a traditional module system to allow the development of large systems. They overload the class mechanism with several tasks and they use packages and namespaces to organize clusters of classes providing weak control for accessing members. Other languages that support generic programming and objects do not have a simple object model to support object-oriented features. In this thesis the language MOOL is presented. MOOL is a class-based object-oriented language that supports modular programming and genericity. The main goal in the design of MOOL was …
Solving Combinatorial Optimization Problems Using A New Algorithm Based On Gravitational Attraction, Barry Lynn Webster
Solving Combinatorial Optimization Problems Using A New Algorithm Based On Gravitational Attraction, Barry Lynn Webster
Theses and Dissertations
This dissertation represents the culmination of research into the development of a new algorithm for locating optimal solutions to difficult problems. This new algorithm is founded upon one of the most basic concepts in nature - so basic that it is in fact one of the four primary forces in physics: gravity. It is called the Gravitational Emulation Local Search algorithm, or GELS. Four variants of the algorithm were developed, representing combinations of two basic methods of operation and two modes of search space exploration. Following development, a series of experiments were conducted to assess the capabilities of this new …
Web-Based Trend Analysis Of Rocket Data Using Xml, Mark Randall Gibson
Web-Based Trend Analysis Of Rocket Data Using Xml, Mark Randall Gibson
Theses and Dissertations
This paper will discuss and prove the feasibility of using XML to transfer, compare, and view data created during automated testing of black boxes; stored both in simple text format and relational database format. This system arises from the need for the reliability department to review the test data from the flight hardware at all testing locations. For the purposes of this paper we will refer to this system as the "Test Data Retrieval System" (TDRS). This data review is being done to determine if there are any negative trends in the hardware that may be surfacing. This data resides …
Learning States For Detecting Anomalies In Time Series, Stan Weidner Salvador
Learning States For Detecting Anomalies In Time Series, Stan Weidner Salvador
Theses and Dissertations
The normal operation of a device can be characterized in different operational states. To identify these states, we introduce a segmentation algorithm called Gecko that can determine a reasonable number of segments using our proposed L method. We then use the RIPPER classification algorithm to describe these states in logical rules. Finally, transitional logic between the states is added to create a finite state automation. Multiple time series data may be used for training, by merging several time series into a single representative time series using dynamic time warping. Our empirical results, on data obtained from the NASA shuttle program, …
Responding To Policies At Runtime In Trustbuilder, Bryan J. Smith
Responding To Policies At Runtime In Trustbuilder, Bryan J. Smith
Theses and Dissertations
Automated trust negotiation is the process of establishing trust between entities with no prior relationship through the iterative disclosure of digital credentials. One approach to negotiating trust is for the participants to exchange access control policies to inform each other of the requirements for establishing trust. When a policy is received at runtime, a compliance checker determines which credentials satisfy the policy so they can be disclosed. In situations where several sets of credentials satisfy a policy and some of the credentials are sensitive, a compliance checker that generates all the sets is necessary to insure that the negotiation succeeds …
Query Rewriting For Extracting Data Behind Html Forms, Xueqi Chen
Query Rewriting For Extracting Data Behind Html Forms, Xueqi Chen
Theses and Dissertations
Much of the information on the Web is stored in specialized searchable databases and can only be accessed by interacting with a form or a series of forms. As a result, enabling automated agents and Web crawlers to interact with form-based interfaces designed primarily for humans is of great value. This thesis describes a system that can fill out Web forms automatically according to a given user query against a global schema for an application domain and, to the extent possible, extract just the relevant data behind these Web forms. Experimental results on two application domains show that the approach …
The United States Marine Corps Data Collaboration Requirements: Retrieving And Integrating Data From Multiple Databases, Pamela J. Cole
The United States Marine Corps Data Collaboration Requirements: Retrieving And Integrating Data From Multiple Databases, Pamela J. Cole
Theses and Dissertations
The goal of this research is to develop an information sharing and database integration model and suggest a framework to fully satisfy the United States Marine Corps collaboration requirements as well as its information sharing and database integration needs. This research is exploratory; it focuses on only one initiative: the IT-21 initiative. The IT-21 initiative dictates The Technology for the United States Navy and Marine Corps, 2000-2035: Becoming a 21st Century Force. The IT-21 initiative states that Navy and Marine Corps information infrastructure will be based largely on commercial systems and services, and the Department of the Navy must ensure …
Fast Registration Of Tabular Document Images Using The Fourier-Mellin Transform, Luke Alexander Daysh Hutchison
Fast Registration Of Tabular Document Images Using The Fourier-Mellin Transform, Luke Alexander Daysh Hutchison
Theses and Dissertations
Image registration, the process of finding the transformation that best maps one image to another, is an important tool in document image processing. Having properly-aligned microfilm images can help in manual and automated content extraction, zoning, and batch compression of images. An image registration algorithm is presented that quickly identifies the global affine transformation (rotation, scale, translation and/or shear) that maps one tabular document image to another, using the Fourier-Mellin Transform. Each component of the affine transform is recovered independantly from the others, dramatically reducing the parameter space of the problem, and improving upon standard Fourier-Mellin Image Registration (FMIR), which …
Evolution Of Control Programs For A Swarm Of Autonomous Unmanned Aerial Vehicles, Kevin M. Milam
Evolution Of Control Programs For A Swarm Of Autonomous Unmanned Aerial Vehicles, Kevin M. Milam
Theses and Dissertations
Unmanned aerial vehicles (UAVs) are rapidly becoming a critical military asset. In the future, advances in miniaturization are going to drive the development of insect size UAVs. New approaches to controlling these swarms are required. The goal of this research is to develop a controller to direct a swarm of UAVs in accomplishing a given mission. While previous efforts have largely been limited to a two-dimensional model, a three-dimensional model has been developed for this project. Models of UAV capabilities including sensors, actuators and communications are presented. Genetic programming uses the principles of Darwinian evolution to generate computer programs to …
An Exploratory Analysis Of Factors Affecting Participation In Air Force Knowledge Now Communities Of Practice, David C. Fitzgerald
An Exploratory Analysis Of Factors Affecting Participation In Air Force Knowledge Now Communities Of Practice, David C. Fitzgerald
Theses and Dissertations
As the AF continues to lose its knowledge base through retirements and downsizing, the need to get maximum use from the remaining knowledge base becomes increasingly important. In their efforts to help the Department of Defense and the Air Force Chief Information Officer (AFCIO) meet their knowledge management goals, Air Force Material Command (AFMC) has been working to implement the use of communities of practice. A primary goal of AFMC/DRW , the AF Knowledge Now program office, and the office of the AFCIO is to increase effectiveness and participation within communities of practice. The goal of this research is to …
Development Approaches Coupled With Verification And Validation Methodologies For Agent-Based Mission-Level Analytical Combat Simulations, Lance E. Champagne
Development Approaches Coupled With Verification And Validation Methodologies For Agent-Based Mission-Level Analytical Combat Simulations, Lance E. Champagne
Theses and Dissertations
This research investigated the applicability of agent-based combat simulations to real-world combat operations. An agent-based simulation of the Allied offensive search for German U-Boats in the Bay of Biscay during World War II was constructed, extending the state-of-the-art in agent-based combat simulations, bridging the gap between the current level of agent-like combat simulations and the concept of agent-based simulations found in the broader literature. The proposed simulation advances agent-based combat simulations to “validateable” mission-level military operations. Simulation validation is a complex task with numerous, diverse techniques available and levels of validation differing significantly among simulations and applications. This research presents …
Exploring Content Management Issues In Air Force On-Line Communities Of Practice: A Multiple Case Study Approach, Jaime A. Rodriguez
Exploring Content Management Issues In Air Force On-Line Communities Of Practice: A Multiple Case Study Approach, Jaime A. Rodriguez
Theses and Dissertations
The practice of content management attempts regardless of platform to ensure that pertinent information is current, relevant, and presented in a usable manner. The Air Force Communities of Practice (CoPs) are hosted by AFMC/DRW, The purpose of these CoPs is to facilitate and promote an environment of capturing and sharing knowledge among members of a particular field task or common practice. As the host for these CoPs AFMC/DRW desires to increase CoP participation efficiency and effectiveness. Addressing existing or potential content management issues will help do so. This multiple-case study research observed and interviewed managers and members of eight active …
An Exploration Of Cultural Factors Affecting Use Of Communities Of Practice, Peter L. Hinrichsen
An Exploration Of Cultural Factors Affecting Use Of Communities Of Practice, Peter L. Hinrichsen
Theses and Dissertations
On-line communities of practice are potentially powerful social learning networks that can improve organizational performance. Unfortunately, administrators of on-line communities of practice report that community members do not take full advantage of this potential. This study used Shaw and Tuggle's (2003) factors of knowledge management (KM) culture affecting organizational acceptance of a knowledge management initiative to explore this issue. It was hypothesized that respondents whose communities of practice possessed higher average community use per member would rate KM culture variables higher than respondents whose communities possessed a lower average community use. An analysis of survey data collected from Air Force …
Automating Security Protocol Analysis, Stephen W. Mancini
Automating Security Protocol Analysis, Stephen W. Mancini
Theses and Dissertations
When Roger Needham and Michael Schroeder first introduced a seemingly secure protocol 24, it took over 18 years to discover that even with the most secure encryption, the conversations using this protocol were still subject to penetration. To date, there is still no one protocol that is accepted for universal use. Because of this, analysis of the protocol outside the encryption is becoming more important. Recent work by Joshua Guttman and others 9 have identified several properties that good protocols often exhibit. Termed Authentication Tests, these properties have been very useful in examining protocols. The purpose of this research is …
Netwars Based Study Of A Joint Stars Link-16 Network, Charlie I. Cruz
Netwars Based Study Of A Joint Stars Link-16 Network, Charlie I. Cruz
Theses and Dissertations
Both secure and anti-jam resistant, the Link-16 is the primary communications channel used by the Joint Surveillance Target Attack Radar System (Joint STARS) for the exchange of real-time tactical data among various ground, air, and sea platforms of the United States of America and North Atlantic Treaty Organization forces. This research explored the effect of increasing network traffic for imagery transfer to the mean delay when operating under different network topologies. Using Network Warfare Simulation (NETWARS), three different missions were simulated to run on five network topologies having a different number of participants, different assigned time slots, and stacked nets. …
An Analysis Of The Performance And Security Of J2sdk 1.4 Jsse Implementation Of Ssl/Tls, Danny R. Bias
An Analysis Of The Performance And Security Of J2sdk 1.4 Jsse Implementation Of Ssl/Tls, Danny R. Bias
Theses and Dissertations
The Java SSL/TLS package distributed with the J2SE 1.4.2 runtime is a Java implementation of the SSLv3 and TLSv1 protocols. Java-based web services and other systems deployed by the DoD will depend on this implementation to provide confidentiality, integrity, and authentication. Security and performance assessment of this implementation is critical given the proliferation of web services within DoD channels. This research assessed the performance of the J2SE 1.4.2 SSL and TLS implementations, paying particular attention to identifying performance limitations given a very secure configuration. The performance metrics of this research were CPU utilization, network bandwidth, memory, and maximum number of …
Intelligent Query Answering Through Rule Learning And Generalization, James M. Carsten
Intelligent Query Answering Through Rule Learning And Generalization, James M. Carsten
Theses and Dissertations
The Department of Defense (DoD) relies heavily on information systems to complete a myriad of tasks, from day-to-day personnel actions to mission critical imagery retrieval, intelligence analysis, and mission planning. The astronomical growth in size and performance of data storage systems leads to problems in processing the amount of data returned on any given query. Typical relational database systems return a set of unordered records. This approach is acceptable in small information systems, but in large systems, such as military image retrieval systems with more than 1 million records, it requires considerable time (often hours to days) to sort through …
Concurrent Cognitive Mapping And Localization Using Expectation Maximization, Kennard R. Laviers
Concurrent Cognitive Mapping And Localization Using Expectation Maximization, Kennard R. Laviers
Theses and Dissertations
Robot mapping remains one of the most challenging problems in robot programming. Most successful methods use some form of occupancy grid for representing a mapped region. An occupancy grid is a two dimensional array in which the array cells represents (x,y) coordinates of a cartesian map. This approach becomes problematic in mapping large environments as the map quickly becomes too large for processing and storage. Rather than storing the map as an occupancy grid, our robot (equipped with ultrasonic sonars) views the world as a series of connected spaces. These spaces are initially mapped as an occupancy grid in a …
Visual Debugging Of Object-Oriented Systems With The Unified Modeling Language, Wendell E. Fox
Visual Debugging Of Object-Oriented Systems With The Unified Modeling Language, Wendell E. Fox
Theses and Dissertations
The Department of Defense (DoD) is developing a Joint Battlespace Infosphere, linking a large number of data sources and user applications. Debugging and analysis tools are required to aid in this process. Debugging of large object-oriented systems is a difficult cognitive process that requires understanding of both the overall and detailed behavior of the application. In addition, many such applications linked through a distributed system add to this complexity. Standard debuggers do not utilize visualization techniques, focusing mainly on information extracted directly from the source code. To overcome this deficiency, this research designs and implements a methodology that enables developers …
Machine Learning Techniques For Characterizing Ieee 802.11b Encrypted Data Streams, Michael J. Henson
Machine Learning Techniques For Characterizing Ieee 802.11b Encrypted Data Streams, Michael J. Henson
Theses and Dissertations
As wireless networks become an increasingly common part of the infrastructure in industrialized nations, the vulnerabilities of this technology need to be evaluated. Even though there have been major advancements in encryption technology, security protocols and packet header obfuscation techniques, other distinguishing characteristics do exist in wireless network traffic. These characteristics include packet size, signal strength, channel utilization and others. Using these characteristics, windows of size 11, 31, and 51 packets are collected and machine learning (ML) techniques are trained to classify applications accessing the 802.11b wireless channel. The four applications used for this study included E-Mail, FTP, HTTP, and …
Throughput Performance Evaluation And Analysis Of Unmodified Bluetooth Devices, Steven J. Taylor
Throughput Performance Evaluation And Analysis Of Unmodified Bluetooth Devices, Steven J. Taylor
Theses and Dissertations
The Air Force relies on the application of new technologies to support and execute its mission. As new technologies develop, the integration of that technology is studied to determine the costs and benefits it may provide to the war fighter. One such emergent technology is the Bluetooth wireless protocol, used to connect a small number of devices over a short distance. The short distance is a feature that makes using the protocol desirable. However short, there is still a vulnerability to interception. This research identifies ranges at which several commercially available Bluetooth devices are usable. Various combinations of both distance …
Automated Agent Ontology Creation For Distributed Databases, Austin A. Bartolo
Automated Agent Ontology Creation For Distributed Databases, Austin A. Bartolo
Theses and Dissertations
In distributed database environments, the combination of resources from multiple sources requiring different interfaces is a universal problem. The current solution requires an expert to generate an ontology, or mapping, which contains all interconnections between the various fields in the databases. This research proposes the application of software agents in automating the ontology creation for distributed database environments with minimal communication. The automatic creation of a domain ontology alleviates the need for experts to manually map one database to other databases in the environment. Using several combined comparison methods, these agents communicate and negotiate similarities between information sources and retain …
Swarm Based Implementation Of A Virtual Distributed Database System In A Sensor Network, Wen C. Lee
Swarm Based Implementation Of A Virtual Distributed Database System In A Sensor Network, Wen C. Lee
Theses and Dissertations
The deployment of unmanned aerial vehicles (UAVs) in recent military operations has had success in carrying out surveillance and combat missions in sensitive areas. An area of intense research on UAVs has been on controlling a group of small-sized UAVs to carry out reconnaissance missions normally undertaken by large UAVs such as Predator or Global Hawk. A control strategy for coordinating the UAV movements of such a group of UAVs adopts the bio-inspired swarm model to produce autonomous group behavior. This research proposes establishing a distributed database system on a group of swarming UAVs, providing for data storage during a …
Software Development Outsourcing Decision Support Tool With Neural Network Learning, James D. Newberry
Software Development Outsourcing Decision Support Tool With Neural Network Learning, James D. Newberry
Theses and Dissertations
The Air Force (AF) needs an evolving software tool for guiding decision makers through the complexities of software outsourcing. Previous research identified specific outsourcing strategies and linked them to goals and consequences through a variety of relationship rules. These strategies and relationship rules were inserted into a decision support tool. Since that time, more historical data and outsourcing literature has been collected thus necessitating an update to such a tool. As the number of software outsourcing projects are completed, the AF must capture the outsourcing decision experiences which guided the projects and their outcomes. In order to efficiently incorporate this …