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Works: 310 works in 342 publications in 1 language and 349 library holdings
Classifications: TL52.3.C6, 536.25
Publication Timeline
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
The report is comprised of the following papers of which the last six are reprints: Concerning the preparation of HMgAlH4 and HMgBH4; Concerning the reactions of lithium and sodium aluminum hydride with grignard reagents in diethyl-ether; Complex metal hydrides of magnesium--preparation and characterization of MMgRnH(3-n)compounds; Concerning the preparation of alkylmagnesium hydrides; Synthesis of N-trialkylborzines from phenyl borate, aluminum and hydrogen and primary amines; Reaction of lithium aluminum hydride with secondary amines in diethyl ether; Preparation of new complex metal hydrides--K2ZnH4 and Na2ZnH4; A convenient and economic route to reactive magnesium hydride; The Direct Synthesis of aminoalanes; The composition of complex metal hydrides in polar solvents-tertiary amines; Concerning the reaction of lithium aluminum hydride with diethylmagnesium in diethyl ether; Reaction of aluminum hydride with diethylmagnesium in tetrahydrofuran; and the Preparation of potassium trihydridomagnesiate, KMgH3
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
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
Measurement of Lung Vibration from Low Frequency Underwater Sound in an Animal Model and Divers Using NIVAMS ( file )
3 editions published between 1998 and 1999 in English and held by 3 libraries worldwide
The attached report covers the activities performed in the past year. These include the design, fabrication, and testing of a travelling wave chamber for the controlled exposure of small mammals to underwater low frequency sound. They also include preparations for an experiment which is to be performed on divers in October 1998
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)
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
Information-Based Multisensor Detection ( file )
2 editions published between 2000 and 2001 in English and held by 2 libraries worldwide
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, limitations on the sensor resources, atmospheric refraction, sensor pointing errors, sea surface induced multipath, nonhomogeneous clutter, sea clutter, etc. that are omitted in most of the legacy simulations. The two primary accomplishments for the first year of this program were the development of a phased array radar model with search and track management functions for multiple targets as well as the development of a sea clutter model with moving target indictor (MTI) waveform designs
Study and analysis of speech parameters and display techniques ( Book )
1 edition published in 1968 in English and held by 2 libraries worldwide
The research demonstrated the feasibility of the hybrid system approach to automatic speech processing. In particular, this approach appears suitable for acquiring statistics regarding a variety of acoustic properties of monosyllabic utterances over very large sample populations in a rapid and efficient manner. On the basis of experimental runs made with several types of normalization and scaling, it is concluded that the following procedure should be adopted in any further processing of data with the present hybrid system. It is felt that vectorgrams produced by the procedure used would be readily amenable to automatic pattern-recognition programming on the digital computer. (Author)
Employing an Effectiveness Model for Calculating Cooling Tower Performance ( Book )
1 edition published in 1991 in English and held by 2 libraries worldwide
Optimization of the design of chiller/cooling tower systems for large office buildings require an accurate detailed model for the cooling tower. This model must be precise and allow for varying air and water flow rates, ambient air conditions and entering water temperatures. The optimization computational requirement is very time consuming, however, due to the tower model requiring solution of three simultaneous differential equations. This project developed as computer program utilizing an effectiveness model to reduce computational time while maintaining good correlation to existing programs. The methodology involved the use of a tower model program that integrated a centrifugal chiller model, cooling tower model, and system optimization strategy. The effectiveness model was utilized in place of the tower model. The results are very encouraging. The computational time required to optimize the design was reduce approximately 75% while maintaining an accuracy of tower water temperature range of approximately 15%. This reduction in computer time will allow an engineer the flexibility to examine many systems and determine the optimum design in a shorter time frame
A Study of the Relationship Between Macroscopic Measures and Physical Processes Occuring During Crack Closure ( file )
2 editions published between 1991 and 1995 in English and held by 2 libraries worldwide
Activity centered on the development and implementation of robust methods for measuring crack opening in the samples studied with X-ray Tomographic Microscopy (XTM). The existing XTM data of notched tensile (NT) samples consists of a three-dimensional stack of several hundred two-dimensional slices, each containing between 400x400 and 600x600 pixels. Analysis of the three-dimensional crack wandering through this volume in done in several steps. The first step is to determine the separation between crack faces using cuts perpendicular to the stack of slices. Separation will be measured as a function of position for the different applied loads. Cuts parallel to the load axis are expected to give a more precise measure of crack opening than measurements within planes parallel to the slices, especially when the openings are on the order of one or two pixels in size
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
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
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
Heat transfer to a gas containing a cloud of particles by J. A McAlister( file )
1 edition published in 1965 in English and held by 2 libraries worldwide
The principles describing the transfer of heat by radiation were formulated in the latter part of the previous century and their application to practical problems has been the subject of much study since that time. The resulting analyses are mostly of limited applicability, however, because of the lengthy calculations involved and the numerous empirical assumptions required to obtain them. Now space exploration, nuclear technology, and plasma research, to name a few, require more nearly exact solutions, since the temperatures encountered in these fields may be much above those in conventional equipment and radiation is likely the dominant mode of heat transfer. Fortunately, solutions are attainable now that high-speed electronic computers can be employed to solve problems that before were hopelessly involved
ARL Intranet Analysis and Development Study ( Book )
2 editions published in 1999 in English and held by 2 libraries worldwide
We analyze the concept and practice of Intranets used in midsize and large enterprises, focusing on their use and impact within research and development (R & D) organizations. We examine the shift from the old concept of business computing to the modern concept of enterprise computing, and consider Intranets-a class of enterprise computing-relative to enterprise computing trends. By analyzing in detail some case studies selected from the literature, on-site visits, and workshop discussions, we then offer three tools to frame the critical issues and provide structure for systematically constructing strategic Intranets specific to a given organization's mission and culture. Arguing that creation of an Intranet that projects an image of a world-class organization demands no less than a world-class enterprise that is strategically enabled through information technology, we then analyze the current U.S. Army Research Laboratory (ARL) Intranet and present a three-step action plan to expedite ARL's movement toward creation of such an Intranet
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
Integrated Automatic Target Detection from Pixel-Registered Visual-Thermal-Range Images ( Book )
2 editions published in 1998 in English and held by 2 libraries worldwide
This paper outlines a method to automatically detect targets from sets of pixel registered visual, thermal, and range images. The method uses operations specifically designed for the different kinds of images. It also introduces the morphological operation called erosion of strength n as a powerful tool for removal of spurious information. Good preliminary results obtained for detection support its suitability for application to the Automatic Target Recognition (ATR) problem
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
Integrated Diagnostics ( file )
2 editions published between 1997 and 1999 in English and held by 2 libraries worldwide
This document summarizes performance activity regarding 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 the 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. This activity is funded through the Office of Naval Research for a basic period of three years, with a potential for two additional years. Second year accomplishments, plans, and technology transfer actions are reported upon. During this reporting period, experiments based on material, load, and vibration information from critical rotorcraft components have been designed and conducted so as to collect data of relevance in understanding the mechanisms of failure for use in developing failure models. These models can serve as a guide in the selection and development of sensors to detect faults and pending failures. Effort has been placed on microsensor development, and achieving the means to analyze and correlate reliable sensor output for operator use. Organizationally, this activity is being accomplished through (16) projects, categorized by three thrust areas
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