| Indoor Navigation for Unmanned Aerial Vehicles |
13-Aug-2009 |
30 pages |
| Authors:
Sobers; D M Jr; Girish Chowdhary; Eric N Johnson; GEORGIA INST OF TECH ATLANTA
|
 | The ability for vehicles to navigate unknown environments is critical for autonomous operation. Mapping of a vehicle's environment and self-localization within that environment are especially difficult for an Unmanned Aerial Vehicle (UAV) due to the complexity of UAV attitude and motion dynamics, as well as interference from external influences such as wind. By using a stable vehicle platform and taking advantage of the geometric structure typical of most indoor environments, ... |
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| Distributed Control of Turbofan Engines |
Aug-2009 |
57 pages |
| Authors:
Alireza Behbahani; Mehrdad Pakmehr; Eric Feron; Marion Mounier; Nathan Fitzgerald; George Kiwada; James D Paduano; GEORGIA INST OF TECH ATLANTA
|
| The purpose of this paper is to develop control theoretic concepts for distributed control of gas turbine engines, and develop a dynamic engine model incorporating distributed components in compressor dynamics, engine cycles, and engine control. The latest results in distributed control combined with adaptive control theory are extended for turbofan engine distributed control. Concepts and architectures for distributed control are developed that create tangible benefits from the distribution of closed-loop ... |
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| Determining a Critical-Skill Hierarchy for Command Post of the Future (CPOF) |
Jul-2009 |
53 pages |
| Authors:
Richard L Wampler; Martin L Bink; Richard Catrambone; GEORGIA INST OF TECH ATLANTA
|
| The Command Post of the Future (CPOF) is a dynamic visualization tool that supports collaborative decision-making in tactical units. The system uses a customizable workspace based on the user's needs rather than a static format. While such an approach to digital-systems design offers flexibility and generality of use, it might also increase the complexity of learning to use the interface. As a precursor to examining alternative training approaches for CPOF, ... |
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| Programming Methodology for High Performance Applications on Tiled Architectures |
Jun-2009 |
431 pages |
| Authors:
Mark A Richards; Daniel P Campbell; GEORGIA INST OF TECH ATLANTA
|
| The core activity of the original Polymorphous Computing Architectures (PCA) program was to advance the design and implementation of several emerging academic multiprocessor-on-a-chip architecture projects (chip multiprocessors, or CMPs). The Georgia Tech team's primary role in the PCA program was to facilitate definitions and implementation of the Morphware Stable Interface (MSI), application software development architecture intended to be portable across PCA architectures, offer high development productivity, and maintain high performance ... |
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| An Information-Theoretic Framework for Evaluating and Optimizing Intrusion Detection Performance |
Jun-2008 |
5 pages |
| Authors:
Wenke Lee; GEORGIA INST OF TECH ATLANTA
|
| We conducted in-depth study of performance metrics used in evaluating intrusion detection systems. We define Intrusion Detection Capability as the ratio of mutual information between the IDS input and output to the entropy of the input. It integrates all the important factors into a single metric. We showed that this new metric is very sensitive to IDS operation parameters. We also defined information-theoretic metrics to measure the effectiveness of an ... |
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| Preventing SQL Code Injection by Combining Static and Runtime Analysis |
01-May-2008 |
68 pages |
| Authors:
Wenke Lee; Adam Shostack; Alessandro Orso; GEORGIA INST OF TECH ATLANTA
|
| Many software systems have evolved to include a Web-based component that makes them available to the public via the Internet and can expose them to a variety of Web-based attacks. One of these attacks is SQL injection, which can give attackers unrestricted access to the databases underlying Web applications and has become increasingly frequent and serious. In this project, we developed techniques and tools to detect, prevent, and report SQL ... |
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| Using YFilter Concepts for Fast Brokering in the Joint Battlespace Infosphere (JBI) |
MAR 2008 |
43 pages |
| Authors:
Justin M. Fiore; Lei Zhao; III Mooney Vincent J.; GEORGIA INST OF TECH ATLANTA
|
| The use of YFilter concepts within the XML brokering task of the Joint Battlespace Infosphere (JBI) is described. Concepts from the YFilter were implemented and extended in the C++ language. The benefit of using YFilter concepts in the brokering task is to share as much processing between similar predicates as possible. The resulting reduction in brokering time can enable faster performance and greater scalability in the JBI. The work presented ... |
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| Stabilization and Carbonization of Gel Spun Polyacrylonitrile/Single Wall Carbon Nanotube Composite Fibers |
FEB 2007 |
28 pages |
| Authors:
Satish Kumar; Han G. Chae; Marilyn Minus; Asif Rasheed; GEORGIA INST OF TECH ATLANTA
|
| Gel spun polyacrylonitrile (PAN) and PAN/single wall carbon nanotube (SWNT) composite fibers have been stabilized in air and subsequently carbonized in argon at 1100 degrees C. Differential scanning calorimetry (DSC) and infrared spectroscopy suggests that the presence of single wall carbon nanotube affects PAN stabilization. Carbonized PAN/SWNT fibers exhibited 10 to 30 nm diameter fibrils embedded in brittle carbon matrix, while the control PAN carbonized under the same conditions exhibited ... |
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| Tissue Tracking: Applications for Brain MRI Classification |
2007 |
10 pages |
| Authors:
John Melonakos; Yi Gao; Allen Tannenbaum; GEORGIA INST OF TECH ATLANTA
|
| Bayesian classification methods have been extensively used in a variety of image processing applications, including medical image analysis. The basic procedure is to combine data-driven knowledge in the likelihood terms with clinical knowledge in the prior terms to classify an image into a pre-determined number of classes. In many applications, it is difficult to construct meaningful priors and, hence, homogeneous priors are assumed. In this paper, we show how expectation-maximization ... |
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| Robotic Discovery of the Auditory Scene |
2007 |
7 pages |
| Authors:
E. Martinson; A. Schultz; GEORGIA INST OF TECH ATLANTA
|
| In this work, we describe an autonomous mobile robotic system for finding and investigating ambient noise sources in the environment. Motivated by the large negative effect of ambient noise sources on robot audition, the long-term goal is to provide awareness of the auditory scene to a robot, so that it may more effectively act to filter out the interference or re-position itself to increase the signal-to-noise ratio. Here, we concentrate ... |
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| Locally-Constrained Region-Based Methods for DW-MRI Segmentation |
2007 |
9 pages |
| Authors:
John Melonakos; Marek Kubicki; Marc Niethammer; James V. Miller; Vandana Mohan; Allen Tannenbaum; GEORGIA INST OF TECH ATLANTA
|
| In this paper, we describe a method for segmenting fiber bundles from diffusion-weighted magnetic resonance images using a locally-constrained region based approach. From a pre-computed optimal path, the algorithm propagates outward capturing only those voxels which are locally connected to the fiber bundle. Rather than attempting to find large numbers of open curves or single fibers, which individually have questionable meaning, this method segments the full fiber bundle region. The ... |
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| Adaptive, Integrated Guidance and Control Design for Line-of-Sight Based Formation Flight |
Aug-2006 |
24 pages |
| Authors:
Byoung S Kim; Anthony J Calise; Ramachandra J Sattigeri; GEORGIA INST OF TECH ATLANTA
|
| This paper presents an integrated guidance and control design for formation flight using a combination of adaptive output feedback and backstepping techniques without an underlying time-scale separation assumption. We formulate the problem as an adaptive output feedback control problem for a line-of-sight (LOS) based formation flight configuration of a leader and a follower aircraft. The design objective is to regulate range and two bearing angle rates while maintaining turn coordination. ... |
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| Development of a Non-Linear Element Code for the Improvement of Piezoelectric Actuator Design and Reliability |
30 JUN 2006 |
20 pages |
| Authors:
Christopher S. Lynch; Chad Landis; GEORGIA INST OF TECH ATLANTA
|
| Chad Landis and Christopher Lynch have developed a finite element code capable of handling constitutive laws with ferroelectric/ferroelastic major hysteresis loops. Two approaches have been developed and compared, a scalar electric field potential based and a vector electric displacement potential based formulation. The code has been used to conduct simulations of geometries in which the field distribution is inhomogeneous and results in local consentrations such as for interdigitated electrodes, for ... |
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| On-Line Path Generation and Tracking for High-Speed Wheeled Autonomous Vehicles |
17 FEB 2006 |
59 pages |
| Authors:
Panagiotis Tsiotras; GEORGIA INST OF TECH ATLANTA
|
| In this work we proposed two semi-analytic methods to generate minimum and near-minimum time velocity profiles for a vehicle along a specified path. Initially we adopt a point mass parameterization of the vehicle with specified acceleration limits. In generating the optimal velocity profile, several undesirable cases, where loss of controllability occurs, and which have been neglected in the literature, are dealt with in this work. A receding horizon implementation is ... |
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| Particle Filtering With Dynamic Shape Priors |
2006 |
13 pages |
| Authors:
Yogesh Rathi; Samuel Dambreville; Allen Tannenbaum; GEORGIA INST OF TECH ATLANTA
|
| Tracking deforming objects involves estimating the global motion of the object and its local deformations as functions of time. Tracking algorithms using Kalman filters or particle filters have been proposed for tracking such objects, but these have limitations due to the lack of dynamic shape information. In this paper, we propose a novel method based on employing a locally linear embedding in order to incorporate dynamic shape information into the ... |
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| Gas Generator Actuator Arrays for Flight Control of Spinning Body Projectiles |
2006 |
6 pages |
| Authors:
Brian A. English; Priya Gadiraju; Christopher S. Rinehart; Ari Glezer; Mark G. Allen; GEORGIA INST OF TECH ATLANTA
|
| This paper presents batch-fabrication lamination approaches for the realization of large arrays of high-power, short-duration gas generator actuators (GGAs), and system implementation approaches for integration of these GGAs into a 40-mm diameter gun-launched projectile for projectile flight control and course correction. The GGAs are tested to determine the impulse delivered per GGA and the time required delivering the impulse. The arrays of GGAs are connected with control electronics and integrated ... |
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| Auditory Evidence Grids |
2006 |
7 pages |
| Authors:
Eric Martinson; Alan Schultz; GEORGIA INST OF TECH ATLANTA
|
| Sound source localization on a mobile robot can be a difficult task due to a variety of problems inherent to a real environment, including robot ego-noise, echoes, and the transient nature of ambient noise. As a result, source localization data are often very noisy and unreliable. In this work, we overcome some of these problems by combining the localization evidence over a variety of robot poses using an evidence grid. ... |
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| Novel Pathways of Nitroaromatic Metabolism: Hydroxylamine Formation, Reactivity and Potential for Ring Fission for Destruction of TNT-CU1214 |
15 AUG 2005 |
381 pages |
| Authors:
Joseph B. Hughes; GEORGIA INST OF TECH ATLANTA
|
| Bioremediation has come into favor as the treatment of choice for munitions contamination because of the prohibitively high cost of the treatment alternative, incineration. To this end, this research was designed to provide information required for development of bioremediation systems to treat TNT contamination. This research investigated biological transformation of TNT with the primary goal of furthering the understanding of the fundamental biochemical mechanisms responsible for transformation of TNT and ... |
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| Feasibility of T/R Module Functionality in a Single SiGe IC |
AUG 2005 |
25 pages |
| Authors:
John D. Cressler; Jonathan Comeau; Joel Andrews; Lance Kuo; Matt Morton; John Papapolymerou; Mark Mitchell; Tracy Wallace; Mike Harris; Bob Parks; GEORGIA INST OF TECH ATLANTA
|
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| Ion-Cavity Integration for Quantum Information Processing |
10 FEB 2005 |
17 pages |
| Authors:
Michael S. Chapman; GEORGIA INST OF TECH ATLANTA
|
| The goal of the program was to develop atom + cavity QED systems capable of storing and coherently manipulating quantum information coded in long-lived ground states of trapped atoms. We have developed atom traps designed to trap arrays of atoms inside high-finesse optical resonators. We have incorporated these atom traps into our high-finesse optical resonators and distilled the number of atoms in the traps down to the single atom level. ... |
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| Design and Wind Tunnel Testing of Guidance Pins for Supersonic Projectiles |
DEC 2004 |
9 pages |
| Authors:
K. C. Massey; J. McMichael; T. Warnock; F. Hay; GEORGIA INST OF TECH ATLANTA
|
| In this paper, the results of a series of experiments funded by DARPA to determine the feasibility of using small actuators to provide directional control for a supersonic projectile are presented. Controlling the flight of the projectile was accomplished by taking advantage of complex shock-boundary layer interactions produced by mechanical devices. One set of wind tunnel tests performed at the Georgia Tech Research Institute characterized the force levels produced by ... |
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| Friction & Wear Under Very High Electromagnetic Stress |
OCT 2004 |
18 pages |
| Authors:
Richard S. Cowan; Steven Danyluk; Francis Moon; J. C. Ford; Donald W. Brenner; GEORGIA INST OF TECH ATLANTA
|
| This document summarizes initial progress toward advancing the fundamental understanding of the friction, wear and mechanics of interfaces subjected to extreme electromagnetic stress, high relative velocities and elevated temperatures. During this reporting period, faculty and staff from Georgia Tech, Cornell, N.C. State and Rensselaer Polytechnic performed tasks in two thrust areas of basic research: Modeling and Experiment. With respect to the former, investigators are looking at mixed lubrication and its ... |
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| The Second Path: The Role of Algorithms in Maintaining Progress in DSP |
30 SEP 2004 |
10 pages |
| Authors:
Mark A. Richards; GEORGIA INST OF TECH ATLANTA
|
| Digital Signal Processing is "...That discipline which has allowed us to replace a circuit previously composed of a capacitor and a resistor with two anti-aliasing filters, an A-to-D and a D-to-A converter, and a general purpose computer (or array processor) so long as the signal we are interested in does not vary too quickly." - Prof. Tom Barnwell, Georgia Tech |
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| Software Architecture for Morphing in Polymorphous Computing Architectures |
28 SEP 2004 |
8 pages |
| Authors:
Daniel P. Campbell; Mark A. Richards; Dennis M. Cottel; Randall R. Judd; GEORGIA INST OF TECH ATLANTA
|
| To exploit the capabilities of PCA hardware while retaining as much end-user portability and performance as possible, the Morphware Forum (www. morphware.org), an informal consortium of PCA contractors and other selected participants, is creating an application development framework, called the Morphware Stable Interface (MSI). A key capability envisioned for PCA systems is morphing, the reconfiguration and re-allocation of PCA hardware resources within a chip in response to various events. Morphing ... |
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| Model and Subcomponent Development for a Pulse-Combustor-Driven Microgenerator |
31 AUG 2004 |
76 pages |
| Authors:
Ben T. Zinn; Ari Glezer; Mark G. Allen; Suresh Menon; David Taylor; GEORGIA INST OF TECH ATLANTA
|
| This project focused on an investigation of the feasibility of pulse- combustion-based micro heat engines for electrical power generation. The micro heat engines to be studied are based on a reciprocating free piston that is driven by a periodic pulse combustion process, resulting in high levels of integration of the mechanical and electrical functionality of the engine (i.e., the same piston performs both the fuel-to-mechanical energy conversion as well as ... |
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| The Morphware Stable Interface: A Software Framework for Polymorphous Computing Architectures |
20 AUG 2004 |
28 pages |
| Authors:
Daniel P. Campbell; Mark A. Richards; Dennis M. Cottel; Randall R. Judd; Kenneth M. McKensie; GEORGIA INST OF TECH ATLANTA
|
| Polymorphous Computing Architectures (PCAs) are computing devices that are capable of significant, rapid reconfiguration directed by software. Composed of several groups of computing elements, PCA devices can be configured to achieve high performance on a wide variety of problem types and processing demands. We describe an emerging concept called the Morphware Stable Interface (MSI), a portable, scalable software development framework to harness the power and complexity of PCAs, while allowing ... |
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| Intraoperative Imaging for Sentinel Lymph Nodes |
AUG 2004 |
19 pages |
| Authors:
Carmen M. Greene; John N. Aarsvold; Nolan Hertel; GEORGIA INST OF TECH ATLANTA
|
| The main objective of this investigation is to determine the feasibility and value of the use of a small field of view camera gamma camera intraoperatively for sentinel lymph node (SLN) localization in breast cancer patients. A camera with a 5 in. x 5 in. field of view (FOV) is being investigated. Clinical experience with 14 subjects using the 1 in. x 1 in. FOV and 15 subjects using the ... |
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| Neural Network Based Adaptive Control of Uncertain and Unknown Nonlinear Systems |
31 MAR 2004 |
18 pages |
| Authors:
Anthony J. Calise; GEORGIA INST OF TECH ATLANTA
|
| The objectives of this research effort were to exploit recent advances in neural network (NN) based adaptive control, with the goal of being able to treat a very general class of nonlinear system, for which the dynamics are not only uncertain, but may in fact be unknown except for minimal structural information, such as the relative degree of the regulated output variables. We were particularly interested in designing adaptive control ... |
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| DYNAMO: Dynamic Assembly From Models |
FEB 2004 |
32 pages |
| Authors:
Spencer Rugaber; Kurt Stirewalt; GEORGIA INST OF TECH ATLANTA
|
| The DYNAMO project is concerned with assembling high-assurance systems from components, and, specifically, with guaranteeing correct interaction of sets of large, heterogeneous components. Several problems must be overcome to provide such guarantees: I) dealing with the sheer complexity of the individual components and their interoperation; 2) maintaining design integrity and information hiding in the individual components; 3) providing the desired guarantees; and 4) not compromising efficiency while accomplishing the other ... |
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| Applicability of Low-Impact Development in the Urban Environment |
13 DEC 2003 |
|
| Authors:
Cassie A. Gorman; GEORGIA INST OF TECH ATLANTA
|
 | As cities have developed more intensively over time, runoff of rainfall after storms has created significant flooding problems. In some cases this runoff also has lead to health hazards with the spreading of disease. With the growth of these problems, several potential solutions have emerged. One such set of solutions is Low Impact Development (LID) methods. The focus of this paper is to determine the applicability of implementing LID stormwater ... |
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| Acoustic Absorption Measurements for Characterization of Gas Mixing |
14 MAY 2003 |
10 pages |
| Authors:
Aurelien Cottet; Lei Wu; Andrew Meyers; David Scarborough; Tim Lieuwen; GEORGIA INST OF TECH ATLANTA
|
| This paper demonstrates the use of acoustic absorption measurements to characterize the level of molecular mixing between gaseous mixtures. This objective is motivated by the observation that many existing methods only quantify macro-scale entrainment. Over a large range of frequencies, acoustic damping is dominated by vibrational relaxation processes. Our approach takes advantage of the fact that the relaxation frequency for a particular gas is often a strong function of the ... |
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| Blind Adaptive Dereverberation of Speech Signals Using a Microphone Array |
11 MAR 2003 |
7 pages |
| Authors:
Tariq S. Bakir; Russell M. Mersereau; GEORGIA INST OF TECH ATLANTA
|
| Presentation on blind adaptive dereverberation of speech signals using a microphone array. |
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| A Reactive Robot Architecture With Planning on Demand |
2003 |
8 pages |
| Authors:
Ananth Ranganathan; Sven Koenig; GEORGIA INST OF TECH ATLANTA
|
| In this paper, we describe a reactive robot architecture that uses fast re-planning methods to avoid the shortcomings of reactive navigation, such as getting stuck in box canyons or in front of small openings. Our robot architecture differs from others in that it gives planning progressively greater control of the robot if reactive navigation continues to fail, until planning controls the robot directly. Our first experiments on a Nomad robot ... |
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| Materials and Fabrication Methods for High Temperature Micro-Magnetic Machines for Micro-Turbine Power Generation |
2003 |
6 pages |
| Authors:
David P. Arnold; Florent Cros; Tiffany Glover; Mark G. Allen; Keithan Hillman; David Veazie; GEORGIA INST OF TECH ATLANTA
|
| This paper presents recent advances in the development of materials and fabrication methods for high temperature (400 - 900 C) magnetic micro-machine for electrical power generation. Suitable materials and material compatibility issues are identified for the device conductors, magnetic cores, and bulk structure. Two fabrication methods for encapsulating electroplated structures inside fusion bonded silicon wafers are presented. These fabrication techniques enable the integration of thick conductive and magnetic materials into ... |
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| A Statistically Based Surface Evolution Method for Medical Image Segmentation: Presentation and Validation |
2003 |
9 pages |
| Authors:
Eric Pichon; Allen Tannenbaum; Ron Kikinis; GEORGIA INST OF TECH ATLANTA
|
| In this paper we present a new algorithm for 3D medical image segmentation. The algorithm is fast, relatively simple to implement, and semi-automatic. It is based on minimizing a global energy defined from a learned non-parametric estimation of the statistics of the region to be segmented. Implementation details are discussed and source code is freely available as part of the 3D Slicer project. In addition, a new unified set of ... |
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| A Three Phase Approach to Solving the Bidline Generation Problem with an Emphasis on Mitigating Pilot Fatigue Through Circadian Rule Enforcement |
16 OCT 2002 |
96 pages |
| Authors:
Jeffrey D. Weir; GEORGIA INST OF TECH ATLANTA
|
| A three phase methodology for solving the Bidline problem for airline crew scheduling is proposed. Phase 1 ensures that the all bidlines will meet a fatigue mitigating minimum rest window that will be constant throughout the entire bid period. Phase 2 ensures that most of the bidlines follow regular weekly and monthly patterns much like shiftwork in other industries that have 24-hour-a-day operations. Finally, Phase 3 creates a final monthly ... |
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| Preliminary Analysis of Reverberation Data in ASIAEX Experiment |
OCT 2002 |
31 pages |
| Authors:
Jianjun Liu; Fenghua Li; Renhe Zhang; Jixun Zhou; GEORGIA INST OF TECH ATLANTA
|
| Viewgraphs on presentation of analysis of reverberation data in the ASIAEX experiment. |
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| Seabottom Acoustics Parameters from Reverberation Vertical Coherence in Shallow Water |
OCT 2002 |
26 pages |
| Authors:
Jin-Xun Zhou; Xue-Zhen Zhang; GEORGIA INST OF TECH ATLANTA
|
| Viewgraphs from presentation of seabottom acoustics parameters from reverberation vertical coherence in shallow water. |
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| Low-Frequency Shallow Water Reverberation and Bottom Scattering Model |
OCT 2002 |
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| Authors:
Fenghua Li; Jianjun Liu; Renhe Zhang; Jixun Zhou; GEORGIA INST OF TECH ATLANTA
|
| Viewgraphs on presentation of low-frequency shallow water reverberation and bottom scattering mode as observed in the South China Sea. |
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| Design Space Exploration and Optimization of Embedded Cache Systems via a Compiler |
SEP 2002 |
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| Authors:
Rodric M. Rabbah; Krishna V. Palem; GEORGIA INST OF TECH ATLANTA
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| Presentation on design space exploration and optimization of embedded cache systems via a compiler. |
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| Intelligent Turbine Engine |
31 JAN 2002 |
68 pages |
| Authors:
Ben T. Zinn; M. Allen; M. Brooke; A. Glezer; W. Haddad; GEORGIA INST OF TECH ATLANTA
|
| This study investigated technologies needed for the development of advanced turbine engines (TE) control systems that could improve TE performance and safety and reduce ownership cost. Since such control systems generally consist of one or more sensors, a control system and one or more actuators, this program investigated novel approaches for improved sensing, control and actuation in TE combustors and compressors. A multidisciplinary team of faculty from the school of ... |
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| Learning Behavioral Parameterization Using Spatio-Temporal Case-Based Reasoning |
2002 |
9 pages |
| Authors:
Maxim Likhachev; Michael Kaess; Ronald C. Arkin; GEORGIA INST OF TECH ATLANTA
|
| This paper presents an approach to learning an optimal behavioral parameterization in the framework of a Case-Based Reasoning methodology for autonomous navigation tasks. It is based on our previous work on a behavior-based robotic system that also employed spatio-temporal case-based reasoning [3] in the selection of behavioral parameters but was not capable of learning new parameterizations. The present method extends the case-based reasoning module by making it capable of learning ... |
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| Engineering Support for High Power Density Gallium Nitride Microwave Transistors |
31 DEC 2001 |
119 pages |
| Authors:
H. M. Harris; J. Laskar; S. Nuttinck; GEORGIA INST OF TECH ATLANTA
|
| Continuous and pulsed RF and IV on-wafer characterization was performed on gallium nitride high electron mobility transistors supplied by three independent sources. Measurements were performed over a range of temperatures and bias conditions to permit an indepth understanding of self- heating effects. Analysis was also performed to investigate substrate effects. |
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| Information-Based Multisensor Detecton |
31 DEC 2001 |
24 pages |
| Authors:
William Dale Blair; GEORGIA INST OF TECH ATLANTA
|
| This program addresses the Navy need for extended firm track range for low altitude cruise missiles through the integration of multiple sensors. Track-Before-Declare (TBD) techniques that utilize signal features are proposed for the synergistic integration of an Electronically Scanned Array (ESA) radar with other sensors for the detection of weak targets. The computer simulation models of the sensors will include the effects of many issues such as finite sensor resolution, ... |
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| A Genetic Approach to Selecting the Optimal Feature for Epileptic Seizure Prediction |
25 OCT 2001 |
|
| Authors:
M . D'Alessandro; G. Vachtsevanos; A. Hinson; R. Esteller; J. Echauz; GEORGIA INST OF TECH ATLANTA
|
| The objective of this study is to (1) develop and apply efficient algorithms to simultaneous intracranial electroencephalographic signals recorded from multiple implanted electrode sites to evaluate the spatial and temporal behavior of seizure precursors and (2) to demonstrate the utility of multiple feature and channel synergy for predicting epileptic seizures in patients with mesial temporal lobe epilepsy. Short-term seizure precursors within a 10-minute time period are investigated. The method consists ... |
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| Application of an Adaptive Control Grid Interpolation Technique to Morphological Vascular Reconstruction: A Component of a Comprehensive Surgical Planning and Evaluation Tool |
25 OCT 2001 |
|
| Authors:
David H. Frakes; Christopher P. Conrad; Timothy M. Healy; Joseph W. Monaco; Mark J. Smith; GEORGIA INST OF TECH ATLANTA
|
| The total cavopulmonary connection (TCPC) is a palliative surgical repair performed on children with a single ventricle (SV) physiology. Much of the power produced by the resultant single ventricle pump is consumed in the systemic circulation, Consequently the minimization of power loss in the TCPC is imperative for optimal surgical outcome, As a component of a comprehensive surgical planning and evaluation tool we have developed a method of vascular morphology ... |
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| Feature Parameter Optimization for Seizure Detection/Prediction |
25 OCT 2001 |
|
| Authors:
R. Esteller; J. Echauz; M. D. Alessandro; G. Vachtsevanos; B. Litt; GEORGIA INST OF TECH ATLANTA
|
| When dealing with seizure detection/prediction problems, there are three main performance metrics that must be optimized: false positive rate, false negative rate, detection delay or, if the problem is seizure prediction, it is desirable to obtain the greatest prediction time achievable. Tuning specific extracted features to individual patients can lead to improved results. The processing window length is also an important parameter whose optimization may significantly affect performance. In this ... |
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| Intelligent Turbine Engines |
19 JUN 2001 |
|
| Authors:
S. Menon; M. Allen; M. Brooke; A. Glezer; W. Haddad; GEORGIA INST OF TECH ATLANTA
|
| This program focuses on the fundamental and practical issues that hinder development of intelligent control systems for improving the performance of turbine engines, such as rotorcraft turboshaft engines. Our approach to the development of an intelligent control system has focused on advances in the basic understanding of engine processes through experiments and advanced computational models, refinement of appropriate sensor and actuator technologies, and development of practical control strategies for control ... |
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| Active Control of Combustor Processes |
JUN 2001 |
16 pages |
| Authors:
B. T. Zinn; M. G. Allen; A. Glezer; J. I. Jagods; Y. Neumeier; GEORGIA INST OF TECH ATLANTA
|
| This paper describes results of several studies of sensors, actuators and control systems for active control of combustor processes. First, the paper discusses the performance of an adaptive active control system (ACS) for controlling detrimental combustion instabilities. This ACS consists of an observer that determines the time dependent characteristics of the instability in real time, a adaptive controller and a fueled a injector actuator. During control, the controller sends a ... |
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| Real-time Cooperative Behavior for Tactical Mobile Robot Teams |
FEB 2001 |
211 pages |
| Authors:
GEORGIA INST OF TECH ATLANTA
|
| Our technical approach to achieving intelligent tactical behaviors for TMR robots is described in this section. We have specific technical approaches in three research areas: Fault-tolerant multi-robot behaviors, Mission specification and user interface, and Real time resource management. (Originally, communication minimization was also a research topic, but was deleted early in the program at government request.) We envision that the nature of military operations in urban terrain (MOUT) can fundamentally ... |
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Reports by Corporate Author
