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GEORGIA INST OF TECH ATLANTA

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Works: 313 works in 342 publications in 1 language and 354 library holdings
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Publications about GEORGIA INST OF TECH ATLANTA
Publications by GEORGIA INST OF TECH ATLANTA
Most widely held works by GEORGIA INST OF TECH ATLANTA
Complex Metal Hydrides. High Energy Fuel Components for Solid Propellant Rocket Motors ( Book )
7 editions published between 1971 and 1978 in English and held by 7 libraries worldwide
Several projects were pursued during the past nine months of this report period. The following projects were completed: (1) Diethyl ester soluble aluminum hydride, (2) Preparation of the first stable complex metal hydride of copper, LiCuH2, (3) Redistribution of aluminum hydride with groups I and II a and b metal halides; (4) Attempted desolvation of ether soluble aluminum hydride; Reactions of MZnx(CH3)2xH compounds with aluminum hydride
User Interfaces for Cooperative Remote Design ( file )
3 editions published between 1997 and 1998 in English and held by 3 libraries worldwide
Our objective in this research has been to allow teams that are physically separated to do detailed design work on large-scale, 3D projects. We seek to develop new methods to facilitate cooperative remote design utilizing both high-bandwidth networking capability and virtual reality with appropriate graphical interfaces to support the collaborative effort. The specific task is to enable multiple users to stand at each of two (or more) Virtual Workbenches at remote locations and interact effectively for design generation. We have made significant progress towards this goal. To build and test our design environment we needed a large scale and complex design model. We chose the Navy Arsenal Ship. This is a multiple deck model and our biggest initial problem was to organize and segment this model so that graphical detail could be handled efficiently and so that individual 3D objects could be moved independently. We separated the model hierarchically along decks and then further along task areas (e.g., galley, mess area, engine room, communications rooms, sleeping quarters, etc.). Initially, we implemented the model using the Simple Virtual Environment (SVE), which provides extensive software support for the creation of virtual applications including handling tracking, interactive tools, virtual menus, and display of 3D objects within the virtual environment. After this initial work we switched from SVE to the SGI Performer environment. The main reasons for this is that Performer is highly optimized for running 3D interactive simulations on Reality Engines, Infinite Reality Engines, and other high-end SGI hardware, and it has recently been made more flexible with new capabilities. Its optimizations including advanced handling of graphical details and textures to sustain interactivity and use of parallelism in multiprocessor architectures. Other capabilities include the handling of over 30 model formats and integration with Multigen modeling capacities
Integrated Diagnostics ( file )
3 editions published between 1997 and 1999 in English and held by 3 libraries worldwide
This document summarizes activity concerning the performance of basic research being conducted in the area of Integrated Diagnostics, a term associated with the technologies and methodologies used to determine how mechanical failures occur, and how they can be detected, predicted, and diagnosed in real time. Objectives, set forth through a Department of Defense Multidisciplinary Research Program of the University Research Initiative (M-URI), are being addressed by faculty and staff from the Georgia Institute of Technology, Northwestern University, and the University of Minnesota. Fourth year accomplishments and plans are reported upon. During this reporting period, experiments based on material, load, and vibration information from critical rotorcraft components continued so as to collect data of relevance in understanding the mechanisms of small crack growth for use in developing fatigue failure models. Such models serve as a guide in the selection and development of sensors to detect faults and pending failures. Effort has been placed on sensor development, and achieving the means to analyze and correlate reliable sensor output for operator use. Organizationally, this activity is being accomplished through (11) projects, categorized by the thrust areas of (1) Mechanical System Health Monitoring, including microsensor development and the condition monitoring of rotordynamic elements; (2) Nondestructive Examination Technology; and (3) Material Failure Characterization and Prediction Methodology
Graph Minors: Structure Theory and Algorithms ( file )
3 editions published between 1993 and 1996 in English and held by 3 libraries worldwide
There have been significant developments in Graph Theory over the last decade that imply the existence of polynomial time algorithms for a large class of problems. These results, however, guarantee the existence of polynomial-time algorithms to solve various problems, but give no hint how to find one. Yet another drawback of these algorithms is that even though they are theoretically fast (O(n2) or O(n3)), the constant hidden in the 0 notation is so enormous that it makes the algorithms impractical. The purpose of this project is to (1) further develop this theory and obtain more theoretical results, (2) apply these results to the design of (at least theoretically) efficient algorithms, and (3) turn these theoretically efficient algorithms into practical ones
A Study of the Relationship Between Macroscopic Measures and Physical Processes Occurring During Crack Closure ( file )
2 editions published between 1991 and 1995 in English and held by 2 libraries worldwide
This report is divided into Parts A and B which cover the numerical modeling with supporting fractography and the high resolution x-ray computed tomography of loaded samples, respectively. The figures for each part immediately follow the text of that part. The focus throughout is to relate macroscopic measures of crack closure to the physical-processes occurring at and near the crack tip. The most significant accomplishments of the program detailed in Part A include the following. Roughness-induced crack closure was characterized by fractographic analysis. The crack tip stress parameter, K, was justified as a forcing function at the crack tip in the roughness-induced crack closure problem. Analytical models were developed to predict the closure stress intensity factor as a function of crack length using a "phenomenological approach." The relations between fractographically measured parameters and the crack driving "force" was investigated. (MM)
Final Report Summer Intern Program ( Book )
2 editions published in 1998 in English and held by 2 libraries worldwide
This report summarizes the summer internship program conducted in 1996, supported by an ONR grant (N00014-92-J-1828, Georgia Tech budget C36-542). The report describes the work undertaken by the students, results of the program, and future plans. Overall, the internship program was a complete success. The goal of the internship program was to give socioeconomically disadvantaged undergraduate students an introduction to what graduate study in Computer Science is like and to encourage them to consider graduate education. A further goal was to build stronger relationships with local and national four year HBCUs (Historically Black Colleges and Universities). We also recruited students from HBCUs nationwide and worked in conjunction with the School of Electrical and Computer Engineering, which has a similar intern program, funded by the National Science Foundation. We worked very closely with local HBCU faculty to provide an internship program that was rewarding, challenging, enjoyable, and closely mentored
Individual Feedback Propensities and Their Effects on Motivation, Training Success, and Performance ( Book )
2 editions published in 1997 in English and held by 2 libraries worldwide
This research project had as its goal the development, validation, and field testing of new measures of individual differences that assess people's propensities to seek, generate, or interpret performance feedback information in a particular way. Specifically, based on preliminary work, it was thought that internal and external propensities exist that make individuals more or less likely to prefer, rely on, seek, or attend to primarily internally or externally generated performance cues. These propensities, if identified and measured, would be related to skill acquisition, performance improvement, self regulatory processes, performance maintenance, as well as a variety of affective and cognitive responses to performance settings based on the interaction of the performer's feedback predispositions and the characteristics of the feedback available. In summary, this study proposed to help one better understand the role of dispositions in explaining how different individuals go about shaping their feedback environment, processing feedback information, and responding to such information. The driving belief behind this line of research has been that individuals differ in ways that are specific to their orientation toward performance feedback situations, and that such differences, if identified and appropriately measured, would be valuable in better understanding the links between feedback and performance as well as other outcomes of interest
Introspective Reasoning Models for Multistrategy Case-Based and Explanation ( Book )
2 editions published in 1997 in English and held by 2 libraries worldwide
On the technical front, we have been working towards using the StatLady system as the starting point for implementing our own ideas. By using StatLady, we can make use of the system's large body of domain information, its capacity for evaluating a student's comprehension of a large number of definitions, procedures, and skills related to statistics, and its tutoring algorithms. We are exploring several options for an interface, including Visual Basic, the language of the original StatLady system. On the theoretical side, we have focussed on designing our planning to tutor module, based on the PLUTO planning to learn system, for augmenting StatLady along the lines of our proposal. Our extension builds on the strengths of StatLady by expanding the way StatLady represents the student model, the way it creates a lesson plan, and the flexibility it has to adapt a lesson plan as student performance deviates from the student model's predictions
Goals and Technologies for Tomorrow's Gas Turbines ( Book )
2 editions published in 1998 in English and held by 2 libraries worldwide
The objective of this program is to investigate control approaches for improving the performance of gas turbine engines, with special emphasis on gas turbine compressors and combustors. The presentations at the workshop were delivered by leading experts from government, industry and universities. The objectives of these presentations and the discussions were to bring into better focus: (1) Problems that adversely affect the performance and cost of operation of gas turbines; and (2) Present and future technologies, especially control approaches, that could significantly improve aircraft performance and reduce their life cycle cost
Extreme Values of Queues, Point Processes and Stochastic Networks ( Book )
2 editions published in 1985 in English and held by 2 libraries worldwide
Work progressed on four topics. In modeling of stochastic flows in networks, compound Poisson approximations for random variables and point processes were developed. In extremal problems in stochastic networks, a family of bounds for the distributions of certain generic random variables were obtained. In optimization of queueing systems, progress was made in determining ways to control or dampen extremes of queues. Finally, research was begun on extreme values of queues and point processes. (Author)
Applications of Multiconductor Transmission Line Theory to the Prediction of Cable Coupling. Volume 6. A Digital Computer Program for Determining Terminal Currents Induced in a Multiconductor Transmission Line by an Incident Electromagnetic Field ( file )
1 edition published in 1978 in English and held by 2 libraries worldwide
The report describes a digital computer program which is designed to compute the terminal currents induced in a multiconductor transmission line by an incident electromagnetic field. Sinusoidal steady state behavior of the line is assumed. The transmission line is uniform and consists of n wires and a reference conductor immersed in a homogeneous, lossless, linear, isotropic medium. The n wires and the reference conductor are assumed to be lossless. The reference conductor may be a wire, an infinite ground plane or an overall, cylindrical shield. The incident electromagnetic field may be a uniform plane wave or a general nonuniform field. The primary restriction on the program validity is that the cross sectional dimensions of the line, e.g., wire separation, must be much less than a wavelength
Performance Analysis of Hybrid ARQ Protocols in a Slotted Code Division Multiple-Access Network ( Book )
1 edition published in 1989 in English and held by 2 libraries worldwide
A link throughput-delay analysis is presented for a slotted direct-sequence spread-spectrum multiple-access packet radio network (PRN) operating in the presence of background noise, multiple-access interference, and pulsed jammer noise. The PRN is comprised of an arbitrary number of full-duplex radio units arranged in a paired-off topology. Slotted ALOHA random access is used in conjunction with CDMA for channel access and a type I hybrid ARQ is used for error control. Expression are derived for the link throughput-delay in terms of the channel cutoff rate and capacity. With the friendly objective of maximizing the link throughput, and the enemy objective of minimizing the link throughput, the dependency of the optimal retransmission probability, processing gain, code rate, and jamming fraction on the population size, traffic intensity, bit energy-to-background-noise ratio, is examined in detail. It is shown that properly designed (optimized) PRN using random-access CDMA offers a significantly larger heavy load throughput than a random-access PRN. Theses. (RH)
Federal Aviation Administration - Georgia Institute of Technology Workshop on Grounding, Bonding and Shielding ( Book )
1 edition published in 1976 in English and held by 2 libraries worldwide
A state-of-the-art review and background research reveals a significant divergence of opinion as to the preferred techniques of grounding of electronic equipment and systems. There exists an absence of agreement on a unified approach to grounding which is applicable to all frequency ranges and signal types. The Systems Research and Development Service of the Federal Aviation Administration in conjunction with the Georgia Institute of Technology conducted a workshop which brought together distinguished experts in the fields of grounding, lightning and electromagnetic compatability. This report contains the papers presented at the workshop. This is the third workshop conducted on the subject of grounding. The papers presented at the 1974 and 1975 workshops are contained in Report No's FAA-RD-74-147 and FAA-RD-75-106. (Author)
Applications of Multiconductor Transmission Line Theory to the Prediction of Cable Coupling. Volume 5. Prediction of Crosstalk Involving Twisted Wire Pairs ( file )
1 edition published in 1978 in English and held by 2 libraries worldwide
A transmission line model of the twisted wire pair is presented which may be used to compute electromagnetic coupling between the twisted wire pair and other circuits. The model is derived by representing the transmission line for the twisted wire pair as a cascade of uniform loops and 'abruptly' nonuniform twists. The overall transmission line matrix is found by cascading the chain parameter matrices, which represent the loops, with the permutation matrices, that represent the twists. Comparisons are presented between the twisted wire pair, the straight wire pair, and the single wire circuit configurations to determine the relative effectiveness in the reduction of electromagnetic coupling. Experimental results are compared to the model predictions which verify that the chain parameter model is accurate to within + or - 3 dB for frequencies such that the line is electrically short (i. e. 1/10 lambda). Finally a second model, the low frequency model, is presented and is shown to be as accurate as the chain parameter model in the prediction of coupling at low frequencies. This low frequency model is very appealing in that it is conceptually much easier to model and also less time consuming, computationally
Intraoperative Imaging for Sentinel Lymph Nodes ( file )
1 edition published in 2004 in English and held by 2 libraries worldwide
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 5 in. x 5 in. FOV suggests that the 5 x 5 FOV is more valuable to SLN localization in breast cancer patients. The task of verifying the content of two databases one consisting of one hundred and twenty-one breast cancer patients and the other consisting of 50 was carefully done. Data from database consisting of 50 patients was presented at the 8th Congress of the World Federation of Nuclear Medicine and Biology 2002 in Santiago, Chile by the senior nuclear medicine technologist at Atlanta VAMC. preliminary data from the probe alone versus probe and camera study was analyzed and an abstract was submitted for Sentinel Node 2004. From the work accomplished this far having a small FOV camera intraoperatively for SLN localization cases that do not make use of preoperative imaging might have some value
Autonomous Micro Hopping Rotochute ( Book )
2 editions published in 2010 in English and held by 2 libraries worldwide
The micro hopping rotochute is a hybrid micro air/ground vehicle configuration invented specifically for long duration exploration of enclosed and tight spaces with complex terrain. The vehicle maneuvers through intricate environments by hopping over or around impeding obstacles. A small, dual rotor system provides the necessary lift while differential torque allows directional control. In addition, the low mass center and spherical exterior shape of the body creates a means to passively reorient the vehicle to an upright attitude when in contact with the ground while protecting the rotating components. Previous research associated with this vehicle configuration has included detailed flight dynamic modeling and system simulation along with an experimental testing program to verify basic flight and ground performance. While basic flight dynamic behavior of this configuration has been studied, research to date has not included autonomous control. This report details two major improvements in the hopping rotochute hybrid air and ground vehicle
The Role of Self-Esteem and Self-Efficacy in Detecting Responses to Feedback ( Book )
2 editions published in 1998 in English and held by 2 libraries worldwide
Our research on the relationships between individual differences, feedback seeking, and reactions to feedback sought to identify and clarify the existing state of knowledge concerning these relationships. We identified five individual difference variables that have historically been included in empirical feedback studies. These are: self-esteem, self-efficacy, locus of control, achievement need, and tolerance for ambiguity. Within the identified research, feedback-related responses were classified into five categories: affective reactions to feedback (e.g., satisfaction with the feedback), cognitive reactions to feedback (e.g., perceived accuracy), feedback monitoring (i.e., using indirect methods such as observing others to gain some performance information), feedback seeking (i.e., asking others for feedback), and other behaviors (often including performance following the receipt of feedback). The results of this investigation are summarized in Appendices A through E. In each appendix, the relationship between an individual difference and the responses given above are outlined. More specifically, the results for self-esteem are contained in Appendix A, for self-efficacy in Appendix B, for locus of control in appendix C, for tolerance for ambiguity in Appendix D, and need for achievement in Appendix E
F-15 Tail Buffet Alleviation: A Smart Structure Approach ( Book )
2 editions published in 1998 in English and held by 2 libraries worldwide
In high performance twin-tail aircraft fighter aircraft (HPTTA), tail buffet was first noticed through its destructive effects of induced fatigue cracks in the F-15 aircraft. The fatigue cracks were noticed shortly (less than six months) after the F-15 was placed in service and many high angles of attack maneuvers were executed. After repeated temporary structural fixes, a thorough investigation of the conditions leading to the crack confirmed that tail buffet is the cause of these effects. There are two significant effects of the buffet induced tail vibrations. These vibrations can restrict the flight maneuvering capability by restricting the angles of attack and speeds at which maneuvers such as the wind-up and wind-down turns can be executed. The second effect is caused by fatigue cracks and the resulting corrosion due to moisture absorption through the cracks. The objective of this work is to describe the results of our work in the area of buffet alleviation by the use of piezoceramic stack actuator assemblies
Intelligent Turbine Engine ( Book )
2 editions published between 2001 and 2002 in English and held by 2 libraries worldwide
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 Aerospace, Electrical and Computer and Mechanical engineering performed this study. Notable accomplishments of this program include: high temperature, wireless MEMS sensors, optical approaches for real time monitoring of combustor efficiency and pattern factor, 3, a 'smart' fuel injector for controlling combustor performance, a synthetic jet actuator for improved combustor mixing processes and pattern factor, nonlinear robust and adaptive controllers for combustion and compression systems, a Neural Network Chip for controlling combustion instabilities, LES and CFD for modeling unsteady combustor and compressor flows, respectively, and active control approaches for unstable compressors
Internal State Variable Models for Rate and Temperature History Dependent Behavior at Finite Strain ( Book )
2 editions published in 1998 in English and held by 2 libraries worldwide
Under nonisothermal histories typical of metals under impact or deformation processing, dependence on the history of temperature and strain rate is potentially first order in terms of material response (McDowell & Voorhees, DSSG Report, IDA, 1995). The principal goal of this program has been to progress towards the next generation of ISV constitutive relations for thermoviscoplastic finite strain behavior of metals. The goals of this research program, which expired at the end of September 1998, were to explore: (1) more physically-based representation of the anisotropy of hardening and flow associated with development of dislocation substructure, including kinematical (deformation) as well as kinetics (flow) aspects; and (2) rate dependence of material strain hardening behavior for strain rates ranging from quasi-static to dynamic, with emphasis on temperature and strain rate history dependence, rather than just instantaneous temperature and strain rate dependence
 
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