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Utilizing Data And Knowledge Mining For Probabilistic Knowledge Bases, Daniel J. Stein Iii
Utilizing Data And Knowledge Mining For Probabilistic Knowledge Bases, Daniel J. Stein Iii
Theses and Dissertations
Problems can arise whenever inferencing is attempted on a knowledge base that is incomplete. Our work shows that data mining techniques can be applied to fill in incomplete areas in Bayesian Knowledge Bases (BKBs), as well as in other knowledge-based systems utilizing probabilistic representations. The problem of inconsistency in BKBs has been addressed in previous work, where reinforcement learning techniques from neural networks were applied. However, the issue of automatically solving incompleteness in BKBs has yet to be addressed. Presently, incompleteness in BKBs is repaired through the application of traditional knowledge acquisition techniques. We show how association rules can be …
The Development Of A Scenario Translator For Distributed Simulations, Heon-Gyu Park
The Development Of A Scenario Translator For Distributed Simulations, Heon-Gyu Park
Theses and Dissertations
There exists a variety of simulation generation and analysis products which have differing purposes and functions designed to simulate a real military battlefield. Due to the particular purpose of each simulation it is impractical to use one scenario of a simulation directly with another simulation without a translator since there is no standard scenario format. In the current environment interoperability between simulations is becoming more important in large scale simulations and distributed exercises. The Scenario File Translator (SFT) provides an easy and accurate way to create a scenario from a heterogeneous simulation. The SFT can load and save the three …
Simworx: An Ada Distributed Simulation Application Framework Supporting Hla And Dis, Earl C. Pilloud
Simworx: An Ada Distributed Simulation Application Framework Supporting Hla And Dis, Earl C. Pilloud
Theses and Dissertations
This research consisted of the analysis, design, and implementation of a reusable application framework for distributed simulation which is compliant with both the DoD High Level Architecture (HLA) for Modeling and Simulation and the Distributed Interactive Simulation (DIS) standards. The goal was to create an Ada-based system for experimentation in distributed simulation. A subsidiary goal was to integrate the system with an existing Air Force Institute of Technology (AFIT) application framework for virtual simulations, Easy_Sim. The application framework was designed using object oriented techniques to enable experimenters to customize it via inheritance extension. The application framework, named SimWorx, consists of …
An Approach To Evaluate Software Effectiveness, Timothy J. Schalick
An Approach To Evaluate Software Effectiveness, Timothy J. Schalick
Theses and Dissertations
The Air Force Operational Test and Evaluation Center (AFOTEC) is tasked with the evaluation of operational effectiveness of new systems for the Air Force. Currently, the software analysis team within AFOTEC has no methodology to directly address the effectiveness of the software portion of these new systems. This research develops a working definition for software effectiveness, then outlines an approach to evaluate software effectiveness-- the Software Effectiveness Traceability Approach (SETA). Effectiveness is defined as the degree to which the software requirements are satisfied and is therefore application-independent. With SETA, requirements satisfaction is measured by the "degree of traceability" throughout the …
Collaborative Workspaces Within Distributed Virtual Environments, William D. Wells
Collaborative Workspaces Within Distributed Virtual Environments, William D. Wells
Theses and Dissertations
In warfare, be it a training simulation or actual combat, a commander's time is one of the most valuable and fleeting resources of a military unit. Thus, it is natural for a unit to have a plethora of personnel to analyze and filter information to the decision-maker. This dynamic exchange of ideas between analyst and commander is currently not available within the distributed interactive simulation (DIS) community. This lack of exchange limits the usefulness of the DIS experience to the commander and his troops. This thesis addresses the commander's isolation problem through the integration of a collaborative workspace within AFIT's …
Solar System Modeler: A Distributed, Virtual Environment For Space Visualization And Gps Navigation, Gary E. Williams
Solar System Modeler: A Distributed, Virtual Environment For Space Visualization And Gps Navigation, Gary E. Williams
Theses and Dissertations
The Solar System Modeler (SM) extends the Space Modeler developed in 1994. It provides a virtual environment enabling an explorer to dynamically investigate near Earth satellites, deep space probes, planets, moons, and other celestial phenomena. The explorer navigates the virtual environment via mouse selected options from menu panels while wearing a tracked, head mounted display (HMD). Alternatively, a monitor may replace the HMD and keyboard controls replace head tracking. The SM's functionality is extended by the ability to broadcast simulated GPS satellite transmissions in compliance with Distributed Interactive Simulation (DIS) protocol standards. The transmissions include information found in true GPS …
Survivability Analysis Of The Iridium Low Earth Orbit Satellite Network, Douglas K. Stenger
Survivability Analysis Of The Iridium Low Earth Orbit Satellite Network, Douglas K. Stenger
Theses and Dissertations
This thesis evaluates the survivability of the proposed Iridium Low Earth Orbit (LEO) Satellite Network. In addition to the complete Iridium constellation, three degraded Iridium constellations are analyzed. This analysis occurs via the use of simulation models, which are developed to use three dynamic routing algorithms over three loading levels. The Iridium network models use a common set of operating assumptions and system environments. The constellation survivability was determined by comparing packet rejection rates, hop' counts, and average end to end delay performance between the various network scenarios. It was concluded that, based on the established scenarios, the proposed Iridium …
Neural Network Classification Of Environmental Samples, Jeffrey L. Blackmon
Neural Network Classification Of Environmental Samples, Jeffrey L. Blackmon
Theses and Dissertations
This research develops a general methodology for designing neural network classifiers for real-world environmental problems. This methodology is demonstrated through the design of a multi-layer perceptron to classify stainless steel and actinide samples. Neural networks, sometimes called artificial neural networks, have been shown capable of classifying complex patterns. Artificial neural networks are physiologically motivated computer algorithms which attempt to mimic the function of the large interconnected network of neurons in the human brain, which has extraordinary pattern recognition capabilities. These artificial neural networks learn to map a set of input features, elemental composition, onto a set of outputs such as …
Development Of Object-Based Teleoperator Control For Unstructured Applications, Hyunki Cho
Development Of Object-Based Teleoperator Control For Unstructured Applications, Hyunki Cho
Theses and Dissertations
For multi-fingered end effectors in unstructured applications, the main issues are control in the presence of uncertainties and providing grasp stability and object manipulability. The suggested concept in this thesis is object based teleoperator control which provides an intuitive way to control the robot in terms of the grasped object and reduces the operator's conceptual constraints. The general control law is developed using a hierarchical control structure, i.e., human interface I gross motion control level in teleoperation control and fine motion control/object grasp stability in autonomous control. The gross motion control is required to provide the position/orientation of the Super …
Analysis And Simulation Of A New Code Tracking Loop For Gps Multipath Mitigation, Mark C. Laxton
Analysis And Simulation Of A New Code Tracking Loop For Gps Multipath Mitigation, Mark C. Laxton
Theses and Dissertations
This thesis proposes a new direct sequence spread spectrum (DS/SS) code phase tracking loop which mitigates the effects of multipath interference on code phase tracking error; such errors can translate to significant range measurement errors in DS/SS ranging systems such as Global Positioning System (GPS). The new code tracking loop, called the modified RAKE delay lock loop (MRDLL), uses maximum likelihood (ML) signal parameter estimation to determine the amplitude, carrier phase, and relative propagation delay of both a direct path and a reflected signal; a multiple correlator code phase tracking loop then exploits these ML signal estimates to remove the …
Weighted Mahalanobis Distance For Hyper-Ellipsoidal Clustering, Khaled S. Younis
Weighted Mahalanobis Distance For Hyper-Ellipsoidal Clustering, Khaled S. Younis
Theses and Dissertations
Cluster analysis is widely used in many applications, ranging from image and speech coding to pattern recognition. A new method that uses the weighted Mahalanobis distance (WMD) via the covariance matrix of the individual clusters as the basis for grouping is presented in this thesis. In this algorithm, the Mahalanobis distance is used as a measure of similarity between the samples in each cluster. This thesis discusses some difficulties associated with using the Mahalanobis distance in clustering. The proposed method provides solutions to these problems. The new algorithm is an approximation to the well-known expectation maximization (EM) procedure used to …
Searching For Ephemeral Subsequences In Strings, Alberto Apostolico, Mikhail J. Attalah
Searching For Ephemeral Subsequences In Strings, Alberto Apostolico, Mikhail J. Attalah
Department of Computer Science Technical Reports
No abstract provided.
Towards The Determination Of The Optimal P-Cyclic Ssor, A. Hadjidimos, D. Noutsos, M. Tzoumas
Towards The Determination Of The Optimal P-Cyclic Ssor, A. Hadjidimos, D. Noutsos, M. Tzoumas
Department of Computer Science Technical Reports
No abstract provided.
Low-Threat Security Patches And Tools, Mohd A. Bashar, Ganesh Krishnan, Markus G. Kuhn, Eugene H. Spafford, Samuel S. Wagstaff Jr
Low-Threat Security Patches And Tools, Mohd A. Bashar, Ganesh Krishnan, Markus G. Kuhn, Eugene H. Spafford, Samuel S. Wagstaff Jr
Department of Computer Science Technical Reports
No abstract provided.
A Cscw Framework For Networked Multimodal Synthetic Environments, Chandrajit L. Bajaj, Fausto Berardini, Steven Cutchin, Raimund Merket
A Cscw Framework For Networked Multimodal Synthetic Environments, Chandrajit L. Bajaj, Fausto Berardini, Steven Cutchin, Raimund Merket
Department of Computer Science Technical Reports
No abstract provided.
Entropy Computations Via Analytic Depoissonization, Philippe Jacquet, Wojciech Szpankowski
Entropy Computations Via Analytic Depoissonization, Philippe Jacquet, Wojciech Szpankowski
Department of Computer Science Technical Reports
No abstract provided.
Misplaced Trust: Kerberos 4 Session Keys, Bryn Dole, Steve Lodin, Eugene H. Spafford
Misplaced Trust: Kerberos 4 Session Keys, Bryn Dole, Steve Lodin, Eugene H. Spafford
Department of Computer Science Technical Reports
No abstract provided.
Safe Structural Conformance For Java, Konstantin Laufer, Gerald Baumgartner, Vincent F. Russo
Safe Structural Conformance For Java, Konstantin Laufer, Gerald Baumgartner, Vincent F. Russo
Department of Computer Science Technical Reports
No abstract provided.
On Asymptotics Of Certain Recurrences Arising In Multi-Alphabet Universal Coding, Wojciech Szpankowski
On Asymptotics Of Certain Recurrences Arising In Multi-Alphabet Universal Coding, Wojciech Szpankowski
Department of Computer Science Technical Reports
No abstract provided.
On The Approximate Pattern Occurrences In A Text, Mireille Régnier, Wojciech Szpankowski
On The Approximate Pattern Occurrences In A Text, Mireille Régnier, Wojciech Szpankowski
Department of Computer Science Technical Reports
No abstract provided.
The Purdue Pse Kernel: Towards A Kernel For Building Pses, Sanjiva Weerawarana, Elias N. Houstis, John R. Rice, Ann C. Catlin, Margaret G. Gaitatzes, Shahani Markus, Tzveten T. Drashansky
The Purdue Pse Kernel: Towards A Kernel For Building Pses, Sanjiva Weerawarana, Elias N. Houstis, John R. Rice, Ann C. Catlin, Margaret G. Gaitatzes, Shahani Markus, Tzveten T. Drashansky
Department of Computer Science Technical Reports
No abstract provided.
Dynamic Scheduling Of Process Groups, Kuei Yu Wang, Dan C. Marinescu, Octavian F. Carbunar
Dynamic Scheduling Of Process Groups, Kuei Yu Wang, Dan C. Marinescu, Octavian F. Carbunar
Department of Computer Science Technical Reports
No abstract provided.
Secure Outsourcing Of Some Computations, Mikhail J. Atallah, Konstantinos N. Pantazopoulos, Eugene H. Spafford
Secure Outsourcing Of Some Computations, Mikhail J. Atallah, Konstantinos N. Pantazopoulos, Eugene H. Spafford
Department of Computer Science Technical Reports
No abstract provided.
Knowledge Discovery In Computational Science: A Case Study In Algorithm Selection, N. Ramakrishnan, John R. Rice
Knowledge Discovery In Computational Science: A Case Study In Algorithm Selection, N. Ramakrishnan, John R. Rice
Department of Computer Science Technical Reports
No abstract provided.
Inference Algorithm Performance And Selection Under Constrained Resources, Brett J. Borghetti
Inference Algorithm Performance And Selection Under Constrained Resources, Brett J. Borghetti
Theses and Dissertations
Knowing that reasoning over probabilistic networks is, in general, NP-hard, and that most reasoning environments have limited resources, we need to select algorithms that can solve a given problem as fast as possible. This thesis presents a method for predicting the relative performance of reasoning algorithms based on the domain characteristics of the target knowledge structure. Armed with this knowledge, the research shows how to choose the best algorithm to solve the problem. The effects of incompleteness of the knowledge base at the time of inference is explored, and requirements for reasoning over incompleteness are defined. Two algorithms for reasoning …
Integrating The Capability Maturity Model For Software And The Quality Air Force Criteria, Marshall B. Messamore
Integrating The Capability Maturity Model For Software And The Quality Air Force Criteria, Marshall B. Messamore
Theses and Dissertations
As defense budgets decrease and it is required to do more with less, the Air Force has chosen to use the Malcolm Baldrige National Quality Award (MBNQA) as the basis for implementing quality principles. The Air Force program is known as Quality Air Force (QAF), and the criteria are referred to as the QAF criteria DEPA95b. At about the same time the Department of the Air Force implemented QAF, the software leaders in the Air Force adopted the Capability Maturity Model for Software (CMM) as the internal standard for Air Force software organizations MOSE9l. Software organizations strapped with both sets …
Export Database Derivation Approach For Supporting Object-Oriented Wrapper Queries, Ee Peng Lim, Hon-Kuan Lee
Export Database Derivation Approach For Supporting Object-Oriented Wrapper Queries, Ee Peng Lim, Hon-Kuan Lee
Research Collection School Of Computing and Information Systems
Wrappers export the schema and data of existing heterogeneous databases and support queries on them. In the context of cooperative information systems, we present a flexible approach to specify the derivation of object-oriented (OO) export databases from local relational databases. Our export database derivation consists of a set of extent derivation structures (EDS) which defines the extent and deep extent of export classes. Having well-defined semantics, the EDS can be readily used in transforming wrapper queries to local queries. Based on the EDS, we developed a wrapper query evaluation strategy which handles OO queries on the export databases. The strategy …
Analysis Of Linkage-Friendly Genetic Algorithms, Laurence D. Merkle
Analysis Of Linkage-Friendly Genetic Algorithms, Laurence D. Merkle
Theses and Dissertations
Evolutionary algorithms (EAs) are stochastic population-based algorithms inspired by the natural processes of selection, mutation, and recombination. EAs are often employed as optimum seeking techniques. A formal framework for EAs is proposed, in which evolutionary operators are viewed as mappings from parameter spaces to spaces of random functions. Formal definitions within this framework capture the distinguishing characteristics of the classes of recombination, mutation, and selection operators. EAs which use strictly invariant selection operators and order invariant representation schemes comprise the class of linkage-friendly genetic algorithms (lfGAs). Fast messy genetic algorithms (fmGAs) are lfGAs which use binary tournament selection (BTS) with …
Algebraic Algorithm Design And Local Search, Robert P. Graham Jr.
Algebraic Algorithm Design And Local Search, Robert P. Graham Jr.
Theses and Dissertations
Formal, mathematically-based techniques promise to play an expanding role in the development and maintenance of the software on which our technological society depends. Algebraic techniques have been applied successfully to algorithm synthesis by the use of algorithm theories and design tactics, an approach pioneered in the Kestrel Interactive Development System (KIDS). An algorithm theory formally characterizes the essential components of a family of algorithms. A design tactic is a specialized procedure for recognizing in a problem specification the structures identified in an algorithm theory and then synthesizing a program. Design tactics are hard to write, however, and much of the …
Requirements, Design, And Development Of A Rapidly Reconfigurable, Photo-Realistic, Virtual Cockpit Prototype, Terry A. Adams
Requirements, Design, And Development Of A Rapidly Reconfigurable, Photo-Realistic, Virtual Cockpit Prototype, Terry A. Adams
Theses and Dissertations
The United States Air Force uses aircraft flight simulators for pilot training and mission rehearsal. They use a variety of simulators for this task ranging with prices ranging from $400,000 to $30,000,000. These simulators have specialized hardware that restricts reuse of their components and increases maintenance costs. Air Education and Training Command wants to reduce simulators cost and improve availability to the operational commands by supporting research in virtual reality flight simulators. This thesis looks at the development of a reconfigurable virtual cockpit in a distributed virtual environment that can be used for different aircraft as well as training scenarios. …