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Articles 55111 - 55140 of 58033
Full-Text Articles in Physical Sciences and Mathematics
A Generalized Schwarz Splitting Method Based On Hermite Collocation For Elliptic Boundary Value Problems, Yu-Ling Lai, Apostolos Hadjidimos, Elias N. Houstis
A Generalized Schwarz Splitting Method Based On Hermite Collocation For Elliptic Boundary Value Problems, Yu-Ling Lai, Apostolos Hadjidimos, Elias N. Houstis
Department of Computer Science Technical Reports
No abstract provided.
Parallel Dynamic Mesh Generation And Domain Decomposition, Poting Wu, Elias N. Houstis
Parallel Dynamic Mesh Generation And Domain Decomposition, Poting Wu, Elias N. Houstis
Department of Computer Science Technical Reports
No abstract provided.
Combinatorial Optimization Problems For Which Almost Every Algorithm Is Asymptotically Optimal, Wojciech Szpankowski
Combinatorial Optimization Problems For Which Almost Every Algorithm Is Asymptotically Optimal, Wojciech Szpankowski
Department of Computer Science Technical Reports
No abstract provided.
A Probabilistic Analysis Of A String Editing Problem And Its Variations, Guy Louchard, Wojciech Szpankowski
A Probabilistic Analysis Of A String Editing Problem And Its Variations, Guy Louchard, Wojciech Szpankowski
Department of Computer Science Technical Reports
No abstract provided.
A Scheduling Policy With Maximal Stability Region For Rings Networks With Spatial Reuse, Leonidas Georgiadis, Wojciech Szpankowski, Leondros Tassiulas
A Scheduling Policy With Maximal Stability Region For Rings Networks With Spatial Reuse, Leonidas Georgiadis, Wojciech Szpankowski, Leondros Tassiulas
Department of Computer Science Technical Reports
No abstract provided.
Extending Multidatabase Transaction Management Techniques To Software Development Environments, Aidong Zhang, Omran Bukhres
Extending Multidatabase Transaction Management Techniques To Software Development Environments, Aidong Zhang, Omran Bukhres
Department of Computer Science Technical Reports
No abstract provided.
C3: A Parallel Model For Coarse-Grained Machines, Susanne E. Hambrusch, Ashfaq A. Khokhar
C3: A Parallel Model For Coarse-Grained Machines, Susanne E. Hambrusch, Ashfaq A. Khokhar
Department of Computer Science Technical Reports
No abstract provided.
A View-Based Approach To Relaxing Global Serializability In Multidatabase Systems, Aidong Zhang, Evaggelia Pitoura, Bharat K. Bhargava
A View-Based Approach To Relaxing Global Serializability In Multidatabase Systems, Aidong Zhang, Evaggelia Pitoura, Bharat K. Bhargava
Department of Computer Science Technical Reports
No abstract provided.
Constructing Distributed Schedulers Using The Messiahs Interface Language, Steve J. Chapin, Eugene H. Spafford
Constructing Distributed Schedulers Using The Messiahs Interface Language, Steve J. Chapin, Eugene H. Spafford
Department of Computer Science Technical Reports
No abstract provided.
Data Structures And Algorithms For The String Statistics Problem, Alberto Apostolico, Franco P. Preparata
Data Structures And Algorithms For The String Statistics Problem, Alberto Apostolico, Franco P. Preparata
Department of Computer Science Technical Reports
No abstract provided.
The Use Of Neural Networks To Support "Intelligent" Scientific Computing, Anupam Joshi, Csanjiva Weerawarana, Elias N. Houstis
The Use Of Neural Networks To Support "Intelligent" Scientific Computing, Anupam Joshi, Csanjiva Weerawarana, Elias N. Houstis
Department of Computer Science Technical Reports
No abstract provided.
Asymptotic Behavior Of The Lempel-Ziv Parsing Scheme And Digital Search Trees, Philippe Jaquet, Wojciech Szpankowski
Asymptotic Behavior Of The Lempel-Ziv Parsing Scheme And Digital Search Trees, Philippe Jaquet, Wojciech Szpankowski
Department of Computer Science Technical Reports
No abstract provided.
Scheduling Support Mechanisms For Autonomous, Heterogeneous, Distributed Systems (Ph.D. Thesis), Steve J. Chapin
Scheduling Support Mechanisms For Autonomous, Heterogeneous, Distributed Systems (Ph.D. Thesis), Steve J. Chapin
Department of Computer Science Technical Reports
No abstract provided.
Parallel Numerical Methods For Partial Differential Equations (Ph.D. Thesis), Sang-Bae Kim
Parallel Numerical Methods For Partial Differential Equations (Ph.D. Thesis), Sang-Bae Kim
Department of Computer Science Technical Reports
No abstract provided.
Correctness Proof Of A Geometric Constraint Solver, Ioannis Fudos, Christoph M. Hoffmann
Correctness Proof Of A Geometric Constraint Solver, Ioannis Fudos, Christoph M. Hoffmann
Department of Computer Science Technical Reports
No abstract provided.
Object-Orientation In Multidatabase Systems, Evaggelia Pitoura, Omran Bukhres, Ahmed K. Elmagarmid
Object-Orientation In Multidatabase Systems, Evaggelia Pitoura, Omran Bukhres, Ahmed K. Elmagarmid
Department of Computer Science Technical Reports
No abstract provided.
Collaborative Multimedia Game Environments, Vinod Anupam, Chandrajit L. Bajaj
Collaborative Multimedia Game Environments, Vinod Anupam, Chandrajit L. Bajaj
Department of Computer Science Technical Reports
No abstract provided.
Effect Of Joystick Versus Control Yoke Use On Personal Computer (Pc) Flight Training: A Comparative Analysis, Gregory Alan Fontaine
Effect Of Joystick Versus Control Yoke Use On Personal Computer (Pc) Flight Training: A Comparative Analysis, Gregory Alan Fontaine
Master's Theses - Daytona Beach
The purpose of this study was to provide a comparative performance analysis of a generic control yoke device and a generic joystick device. The comparison provided data needed for further evaluation of personal computer (PC) aircrew training device (ATD) potential. Both devices were used in support of the same PC flight simulation software program, and were evaluated using the experimental research method. Objective and subjective data were obtained during controlled testing, and subsequently analyzed using basic summation and t-test methods. The results tested the research hypothesis that there is no significant difference in personal computer ATD operator performance using a …
Design And Construction Of The Aerobot Robotic Manipulator (Arm), William L. Cochran
Design And Construction Of The Aerobot Robotic Manipulator (Arm), William L. Cochran
Theses and Dissertations
This thesis designed, constructed, and tested a robotic arm for the Aerobot Aerial Robot. The main purpose of the ARM is to enable the Aerobot to retrieve objects for use in an annual robotics competition. Design of the ARM involved synthesizing the characteristics of simplicity, weight, strength, and size. The result was a three-degree-of-freedom manipulator that uses electric motors, cable linkages, and telescoping tubes to access a work space below the Aerobot. Forward and inverse kinematics were investigated to enable automation of the ARM. Data was collected from infrared sensors to validate the model. Manipulation of the ARM is presently …
A Method For Populating The Knowledge Base Of Aptas, A Domain-Oriented Application Composition System, Raleigh A. Sandy Iii
A Method For Populating The Knowledge Base Of Aptas, A Domain-Oriented Application Composition System, Raleigh A. Sandy Iii
Theses and Dissertations
A formal process is described for populating the knowledge base of the Automatic Programming Technologies for Avionics Software APTAS system. This process was developed using a general knowledge base population process that applies to many knowledge-based software engineering systems. This general process is also described. The formal process for APTAS was demonstrated by storing new information from the radar tracking domain into the knowledge base of APTAS. Several procedures some automatic and some manual were implemented to support the formal process.
Integration And Enhancement Of The Saber Wargame, Karl S. Mathias
Integration And Enhancement Of The Saber Wargame, Karl S. Mathias
Theses and Dissertations
The Saber wargame is a theater-level air/land battle wargame written in Ada that is being developed for the Air Force Wargaming Center at Maxwell AFB, AL. This thesis documents how the user interface and simulation engine were integrated. Integration was accomplished by developing a portable object-oriented database system (OODBMS) interface. The interface was implemented in Ada and tied to an OODBMS also written in Ada. Using the interface, both subsystems were able to work from a consistent database and exchange information. The user interface was enhanced by converting it from the Software Technology for Adaptable Reliable Systems Ada/X Window System …
A Prototype Architecture For An Automated Scenario Generation System For Combat Simulations, Mark W. Pfefferman
A Prototype Architecture For An Automated Scenario Generation System For Combat Simulations, Mark W. Pfefferman
Theses and Dissertations
This research effort examines the problem of automating the scenario generation process and presents a prototype architecture for an automated scenario generation system. This architecture is designed using an object- oriented approach which leads to a modular and modifiable design. The architecture provides a mechanism for automatically generating scenario files from a textual US Army operation order. This translation process occurs in two phases. First, the text operation order is translated into an intermediate format called the mission file. In the second phase, the system reads the mission file, instantiates intelligent entities, and assigns missions to those entities. The intelligent …
Domain Modeling Of Time-Dependent Systems, Robert W. Waggoner
Domain Modeling Of Time-Dependent Systems, Robert W. Waggoner
Theses and Dissertations
This research investigated the feasibility of composing time-dependent specifications in Architect, a domain-oriented application composition and generation system being developed at the Air Force Institute of Technology (AFIT). Architect composes formally specified domain objects into an executable software specification that can be used to verify program correctness prior to generation of language specific code. As part of this research, domain modeling techniques were investigated and a candidate process was selected for evaluation. The process was used to develop domain models for two diverse time-dependent domains. Using object-oriented analysis, formal specifications were developed for a collection of event-driven logic circuit components …
Domain Analysis And Modeling Of A Model-Based Software Executive, Robert L. Welgan
Domain Analysis And Modeling Of A Model-Based Software Executive, Robert L. Welgan
Theses and Dissertations
This research was adapted the domain analysis techniques of Prieto- Diaz and Tracz to specify a domain analysis process which was used to conduct domain analysis over the domain of software executives. This analysis created a set of informal and formal domain model artifacts. The domain model artifacts were instantiated into two application executive subsystems. These executive subsystems operated in Architect, a domain-oriented application composition system based on the Object-Connection-Update OCU model. This research demonstrated and evaluated execution of the instantiated executive domain model in a series of event-driven and time-driven applications. As a consequence of developing the application executive …
Three Dimensional Object Recognition Using A Complex Autoregressive Model, David E. Chelen
Three Dimensional Object Recognition Using A Complex Autoregressive Model, David E. Chelen
Theses and Dissertations
Based on an autoregressive model, Complex Partial Correlation CPARCOR features are known to provide exceptional Position, Scale, and Rotation Invariant PSRI properties for planar 2-Dimensional 2-D object recognition. Although autogressive models have been successfully applied to numerous spatio-temporal recognition tasks, the effects of out-of-plane image rotations were never considered. This study investigates application of the CPAR-COR model to a five class problem of nonplanar 2-D views of 3-D objects. Recognition based on CPAR-COR features is evaluated using a Template Matching algorithm, two K-Nearest-Neighbor KNN classifiers, and a Hidden Markov Model HMM. Direct comparisons to recognition based on Fourier features are …
Discovery Learning In Autonomous Agents Using Genetic Algorithms, Edward O. Gordon
Discovery Learning In Autonomous Agents Using Genetic Algorithms, Edward O. Gordon
Theses and Dissertations
As the new Distributed Interactive Simulation (DIS) draft standard evolves into a useful document and distributed simulations begin to emerge that implement parts of the standard, there is renewed interest in available methods to effectively control autonomous aircraft agents in such a simulated environment. This investigation examines the use of a genetics-based classifier system for agent control. These are robust learning systems that use the adaptive search mechanisms of genetic algorithms to guide the learning system in forming new concepts (decision rules) about its environment. By allowing the rule base to evolve, it adapts agent behavior to environmental changes. Addressed …
Multiple Model Adaptive Estimation Applied To The Lambda Urv For Failure Detection And Identification, David W. Lane
Multiple Model Adaptive Estimation Applied To The Lambda Urv For Failure Detection And Identification, David W. Lane
Theses and Dissertations
Multiple Model Adaptive Estimation (MMAE) is a method of estimating unknown system parameters by modeling all possible parameter configurations in several models. The parameters for this research are failure status conditions associated with flight control actuators and sensors on the LAMBDA Unmanned Research Vehicle, an experimental aircraft operated by Wright Laboratory Flight Controls Division at Wright-Patterson Air Force Base, Ohio. Six actuator failures and eight sensor failures are modeled, along with the fully functional aircraft, in fifteen elemental Kalman filters. These filters propagate and update their own aircraft state estimates in real time. A probability computation representing the likelihood of …
An Analysis Of The Root Causes Of Delays And Deficiencies In The Development Of Embedded Software For Air Force Weapon Systems, Jay R. Hopkins, Curtis De Keyrel
An Analysis Of The Root Causes Of Delays And Deficiencies In The Development Of Embedded Software For Air Force Weapon Systems, Jay R. Hopkins, Curtis De Keyrel
Theses and Dissertations
The importance of embedded software, used in every subsystem of ah major weapon systems used by the United States Air Force, has increased drastically over the last decades. However, in spite of the regulations currently in existence, developing and acquiring software which meets the user requirements within the original cost and schedule estimates continues to be difficult. At the same time, the Air Force has pushed to improve the development process with the Total Quality Management TQM program. The primary method used to improve the process has been to create metrics, collect data on these metrics, and then perform a …
A Distributed Interactive Simulation Based Remote Debriefing Tool For Red Flag Missions, Michael T. Gardner
A Distributed Interactive Simulation Based Remote Debriefing Tool For Red Flag Missions, Michael T. Gardner
Theses and Dissertations
Air Force leaders, recognizing the need for improved training following the Vietnam War, implemented the Red Flag exercises at Nellis AFB. At the heart of this training is the Red Flag Measurement and Debriefing System RFMDS and its capability to accurately reconstruct the elements of an intense exercise fought over the deserts of Nevada. This thesis uses the technology of distributed interactive simulation DIS to transmit aircraft telemetry onto computer networks, allowing the monitoring and analysis of live Red Flag missions at any site with compatible communications equipment and thesis software. The use of standard DIS protocols enables simulators to …
A Probabilistic Approach To Fault Diagnosis In Linear Lightwave Networks, Robert H. Deng, A. A. Lazar, W. Wang
A Probabilistic Approach To Fault Diagnosis In Linear Lightwave Networks, Robert H. Deng, A. A. Lazar, W. Wang
Research Collection School Of Computing and Information Systems
The application of probabilistic reasoning to fault diagnosis in linear lightwave networks (LLNs) is investigated. The LLN inference model is represented by a Bayesian network (or causal network). An inference algorithm is proposed that is capable of conducting fault diagnosis (inference) with incomplete evidence and on an interactive basis. Two belief updating algorithms are presented which are used by the inference algorithm for performing fault diagnosis. The first belief updating algorithm is a simplified version of the one proposed by Pearl (1988) for singly connected inference models. The second belief updating algorithm applies to multiply connected inference models and is …