You searched for +publisher:"Georgia Tech" +contributor:("Lanterman, Aaron").
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Georgia Tech
1.
Nixon, Mason Earl.
Utilization of auditory cues to enhance therapy for children with cerebral palsy.
Degree: MS, Electrical and Computer Engineering, 2013, Georgia Tech
URL: http://hdl.handle.net/1853/51736 
► The objective of the research is to examine the impact of auditory stimulus on improving reaching performance in children with cerebral palsy. A form of…
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▼ The objective of the research is to examine the impact of auditory stimulus on improving reaching performance in children with cerebral palsy. A form of auditory stimulus, called rhythmic auditory stimulation (RAS), is well-established in neurological fields as well as in music-based rehabilitation and therapy. RAS is a method in which the rhythm functions as a sensory cue to induce temporal stability and enhancement of movement patterns by what is believed to be a temporal constraint of the patient’s internal optimized path of motion. In current neurological studies, it is suggested that activity in the premotor cortex may represent the integration of auditory information with temporally organized motor action during rhythmic cuing. Based on this theory, researchers have shown that rhythmic auditory stimulation can produce significant improvement in mean gait velocity, cadence, and stride length in patients with Parkinson’s disease. Evidence validating this observation was also seen in a study on hemiparetic stroke wherein patients displayed improvements in spatio-temporal arm control, reduction in variability of timing and reaching trajectories, and kinematic smoothing of the wrist joint during rhythmic entrainment. Lastly, studies have suggested an accompaniment of sound feedback in addition to visual feedback can result in a positive influence and higher confidence in patients who have had a stroke or spinal cord injury. Although an effect of rhythmic cuing on upper extremity therapy has been explored in areas where brain injury has occurred (such as patients who have incurred stroke, spinal injury, traumatic brain injury, etc.), what has not been explored is the effect of rhythmic cuing on upper extremity therapy for individuals with neurological movement disorders, such as cerebral palsy. Thus, in this research, we set out to explore the effect of RAS in therapeutic interventions for children with cerebral palsy. Through this investigation, we examine its effect on reaching performance as measured through range of motion, peak angular velocity, movement time, path length, spatio-temporal variability, and movement units. For this assessment, we created a virtual system to test the aforementioned principles. We established clinically based angular measurements that include elbow flexion, shoulder flexion, and shoulder abduction using a 3D depth sensor to evaluate relevant metrics in upper extremity rehabilitation. We validated the output of our measurements through a comparison with a Vicon Motion Capture System. We then confirmed the trends of the metrics between groups of adults, children, and children with cerebral palsy. Through testing our system with adults, children, and children with cerebral palsy, we believe we have constructed a system that may induce engagement, which is critical to physical therapy, and may also have a positive impact on the metrics. Although we see trends indicative of an effect through use of the system on children with cerebral palsy, we believe further testing is needed in order…
Advisors/Committee Members: Howard, Ayanna M. (advisor), Lanterman, Aaron (committee member), Wills, Linda (committee member).
Subjects/Keywords: Upper extremity; Carebral palsy; Range of motion; Microsoft; Kinect; Rehabilitation; Auditory evoked response; Kinect (Programmable controller)
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APA (6th Edition):
Nixon, M. E. (2013). Utilization of auditory cues to enhance therapy for children with cerebral palsy. (Masters Thesis). Georgia Tech. Retrieved from http://hdl.handle.net/1853/51736
Chicago Manual of Style (16th Edition):
Nixon, Mason Earl. “Utilization of auditory cues to enhance therapy for children with cerebral palsy.” 2013. Masters Thesis, Georgia Tech. Accessed January 17, 2021.
http://hdl.handle.net/1853/51736.
MLA Handbook (7th Edition):
Nixon, Mason Earl. “Utilization of auditory cues to enhance therapy for children with cerebral palsy.” 2013. Web. 17 Jan 2021.
Vancouver:
Nixon ME. Utilization of auditory cues to enhance therapy for children with cerebral palsy. [Internet] [Masters thesis]. Georgia Tech; 2013. [cited 2021 Jan 17].
Available from: http://hdl.handle.net/1853/51736.
Council of Science Editors:
Nixon ME. Utilization of auditory cues to enhance therapy for children with cerebral palsy. [Masters Thesis]. Georgia Tech; 2013. Available from: http://hdl.handle.net/1853/51736
Georgia Tech
2.
English, Brittney Ann.
A physical therapy system for encouraging specific motion in wrist rehabilitation exercises.
Degree: PhD, Electrical and Computer Engineering, 2018, Georgia Tech
URL: http://hdl.handle.net/1853/62181
► The objective this research is to design a passive therapy device with rehabilitation gaming suite that employs an adaptive algorithm that alters game play in…
(more)
▼ The objective this research is to design a passive therapy device with rehabilitation gaming suite that employs an adaptive algorithm that alters game play in order to best fit the needs of the user. The goal of physical therapeutic exercises is to increase proficiency of a motor skill. Physical therapeutic exercises are commonly prescribed to individuals with motor disabilities. During the physical therapy process, individuals will usually practice once a week with the assistance of a clinician and six days a week in isolation. When practicing exercises in the presence of a skilled clinician, an individual receives several benefits including: (1) real-time feedback on accuracy of motions; (2) real-time adaptations to an exercise plan that accommodates the client's skill level and performance; (3) social interactions that increase engagement; and (4) positive feedback that increases morale. These benefits are not realized by the client when practicing exercises in isolation, causing clients to struggle to comply with therapeutic regimens at home. To create this system, first, we designed a passive exoskeleton with a rehabilitation gaming suite that encourages therapeutic motions. Then, we verified its ability to increase participant engagement while completing therapeutic exercises. Next, we verified the ability of our system to encourage accurate therapeutic motions. We then used machine learning techniques to process data from popular video games in order to classify task difficulty and make the rehabilitation game adaptive, so it has the capability to learn and grow with users. A final experiment was conducted with elderly adults and stroke survivors that suggests that adaptive user experiences help promote expedited learning of the task.
Advisors/Committee Members: Howard, Ayanna M. (advisor), Wills, Linda (committee member), Lanterman, Aaron (committee member), Essa, Irfan (committee member), Anderson, David (committee member).
Subjects/Keywords: Rehabilitation robotics
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APA (6th Edition):
English, B. A. (2018). A physical therapy system for encouraging specific motion in wrist rehabilitation exercises. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/62181
Chicago Manual of Style (16th Edition):
English, Brittney Ann. “A physical therapy system for encouraging specific motion in wrist rehabilitation exercises.” 2018. Doctoral Dissertation, Georgia Tech. Accessed January 17, 2021.
http://hdl.handle.net/1853/62181.
MLA Handbook (7th Edition):
English, Brittney Ann. “A physical therapy system for encouraging specific motion in wrist rehabilitation exercises.” 2018. Web. 17 Jan 2021.
Vancouver:
English BA. A physical therapy system for encouraging specific motion in wrist rehabilitation exercises. [Internet] [Doctoral dissertation]. Georgia Tech; 2018. [cited 2021 Jan 17].
Available from: http://hdl.handle.net/1853/62181.
Council of Science Editors:
English BA. A physical therapy system for encouraging specific motion in wrist rehabilitation exercises. [Doctoral Dissertation]. Georgia Tech; 2018. Available from: http://hdl.handle.net/1853/62181
Georgia Tech
3.
Kerr, Andrew J.
Theoretical performance bounds for the estimation of target parameters from electromagnetic induction data.
Degree: PhD, Electrical and Computer Engineering, 2020, Georgia Tech
URL: http://hdl.handle.net/1853/62858
► Cramer-Rao lower bounds are derived and analyzed for the unknown target parameters associated with frequency-domain electromagnetic induction measurements of a target. The target parameters include…
(more)
▼ Cramer-Rao lower bounds are derived and analyzed for the unknown target parameters associated with frequency-domain electromagnetic induction measurements of a target. The target parameters include the target’s tensors, relaxation frequencies, and its location. The estimation of these parameters is critical for successfully identifying and mitigating buried landmines amongst other buried metallic objects in humanitarian demining applications of electromagnetic induction systems. The derivation of these bounds provides a framework for assessing the theoretical performance of current and future frequency-domain electromagnetic induction systems as it relates to estimating these parameters. These bounds also serve as a benchmark against which estimators of these target parameters can be compared. The framework and corresponding analysis of the bounds provide a better understanding of the factors that influence these bounds, giving researchers additional insights and tools for developing better signal processing algorithms, sensors, and electromagnetic induction systems.
Advisors/Committee Members: Scott, Waymond (advisor), McClellan, James (advisor), Lanterman, Aaron (committee member), Durgin, Greg (committee member), Cohen, Morris (committee member), Xie, Yao (committee member).
Subjects/Keywords: Electromagnetics; Induction; Cramer-Rao lower bounds; EMI
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APA (6th Edition):
Kerr, A. J. (2020). Theoretical performance bounds for the estimation of target parameters from electromagnetic induction data. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/62858
Chicago Manual of Style (16th Edition):
Kerr, Andrew J. “Theoretical performance bounds for the estimation of target parameters from electromagnetic induction data.” 2020. Doctoral Dissertation, Georgia Tech. Accessed January 17, 2021.
http://hdl.handle.net/1853/62858.
MLA Handbook (7th Edition):
Kerr, Andrew J. “Theoretical performance bounds for the estimation of target parameters from electromagnetic induction data.” 2020. Web. 17 Jan 2021.
Vancouver:
Kerr AJ. Theoretical performance bounds for the estimation of target parameters from electromagnetic induction data. [Internet] [Doctoral dissertation]. Georgia Tech; 2020. [cited 2021 Jan 17].
Available from: http://hdl.handle.net/1853/62858.
Council of Science Editors:
Kerr AJ. Theoretical performance bounds for the estimation of target parameters from electromagnetic induction data. [Doctoral Dissertation]. Georgia Tech; 2020. Available from: http://hdl.handle.net/1853/62858
Georgia Tech
4.
Hayes, Charles Ethan.
Low-rank model exploitation of electromagnetic induction sensors.
Degree: PhD, Electrical and Computer Engineering, 2020, Georgia Tech
URL: http://hdl.handle.net/1853/63587
► The objective of this research is to improve the signal processing of electromagnetic induction (EMI) sensors for detection, localization, characterization, and classification of targets buried…
(more)
▼ The objective of this research is to improve the signal processing of electromagnetic induction (EMI) sensors for detection, localization, characterization, and classification of targets buried under the surface of the earth. This research focuses on developing a new low-rank physical model of EMI targets. Based on the low-rank model, a new processing paradigm is developed to exploit the data’s structure within the measurements. This research develops a new low-rank exploitation framework for EMI sensors that will improve detection, localization, characterization, and classification for future EMI systems. This research provides detailed analysis of the new low-rank model and the low-rank processing framework. Performance results are demonstrated on simulated data, lab collected data, and field collected measurements to validate the new approaches.
Advisors/Committee Members: McClellan, James (advisor), Scott, Waymond (advisor), Zajic, Alenka (committee member), Davenport, Mark (committee member), Lanterman, Aaron (committee member), Wilson, Joseph (committee member).
Subjects/Keywords: EMI; Electromagnetic induction; Low rank
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APA (6th Edition):
Hayes, C. E. (2020). Low-rank model exploitation of electromagnetic induction sensors. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/63587
Chicago Manual of Style (16th Edition):
Hayes, Charles Ethan. “Low-rank model exploitation of electromagnetic induction sensors.” 2020. Doctoral Dissertation, Georgia Tech. Accessed January 17, 2021.
http://hdl.handle.net/1853/63587.
MLA Handbook (7th Edition):
Hayes, Charles Ethan. “Low-rank model exploitation of electromagnetic induction sensors.” 2020. Web. 17 Jan 2021.
Vancouver:
Hayes CE. Low-rank model exploitation of electromagnetic induction sensors. [Internet] [Doctoral dissertation]. Georgia Tech; 2020. [cited 2021 Jan 17].
Available from: http://hdl.handle.net/1853/63587.
Council of Science Editors:
Hayes CE. Low-rank model exploitation of electromagnetic induction sensors. [Doctoral Dissertation]. Georgia Tech; 2020. Available from: http://hdl.handle.net/1853/63587
Georgia Tech
5.
Harper, Andrew.
Interference design in wireless communication systems.
Degree: PhD, Electrical and Computer Engineering, 2016, Georgia Tech
URL: http://hdl.handle.net/1853/58167
► Interference in wireless communication systems is generally thought of as being produced by an outside, uncontrolled source. With this philosophy, interference must be accounted for…
(more)
▼ Interference in wireless communication systems is generally thought of as being produced by an outside, uncontrolled source. With this philosophy, interference must be accounted for and its detrimental effects mitigated. However, there are also cases where interference can be leveraged during system design for its own purpose. This presentation discusses tools for interference design, and proposes new methods for using intentional interference in wireless communications. First, we introduce two tools that can be used during design to help select system parameters and reduce the computational complexity of system analysis. We then present two examples of methods of interference design in wireless communication systems. The first method eliminates inter-system interference and processing redundancies in a jointly-designed wireless communication and radar systems. The second method concerns secret communication, where it is shown that clever design of interference can simultaneously reduce power expenditure and increase secure communication rates.
Advisors/Committee Members: Ma, Xiaoli (advisor), Barry, John R. (committee member), Lanterman, Aaron D. (committee member), Baxley, Robert J. (committee member), Morley, Thomas D. (committee member).
Subjects/Keywords: Interference; Wireless communication; Physical layer security; Joint radar-communication systems
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APA (6th Edition):
Harper, A. (2016). Interference design in wireless communication systems. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/58167
Chicago Manual of Style (16th Edition):
Harper, Andrew. “Interference design in wireless communication systems.” 2016. Doctoral Dissertation, Georgia Tech. Accessed January 17, 2021.
http://hdl.handle.net/1853/58167.
MLA Handbook (7th Edition):
Harper, Andrew. “Interference design in wireless communication systems.” 2016. Web. 17 Jan 2021.
Vancouver:
Harper A. Interference design in wireless communication systems. [Internet] [Doctoral dissertation]. Georgia Tech; 2016. [cited 2021 Jan 17].
Available from: http://hdl.handle.net/1853/58167.
Council of Science Editors:
Harper A. Interference design in wireless communication systems. [Doctoral Dissertation]. Georgia Tech; 2016. Available from: http://hdl.handle.net/1853/58167
Georgia Tech
6.
Wunderlich, Richard Bryan.
Floating-gate-programmable and reconfigurable, digital and mixed-signal systems.
Degree: PhD, Electrical and Computer Engineering, 2014, Georgia Tech
URL: http://hdl.handle.net/1853/51815
► This body of work as whole has the theme of using floating-gates and reconfigurable systems to explore and implement non-traditional computing solutions to difficult problems.…
(more)
▼ This body of work as whole has the theme of using floating-gates and reconfigurable systems to explore and implement non-traditional computing solutions to difficult problems. Various computational methodologies are used simultaneously to solve problems by mapping pieces of them to the appropriate type of computer. There exists no systematic approach to simultaneously apply analog, digital, and neuromorphic techniques to solving general problems. Typically, this is a very difficult task, and one that few attempt to undertake. However, when done right, solutions can be found with orders-of-magnitude improvement over existing solutions restricted to using only one type computational domain. To that end, I have helped build large and complicated reconfigurable systems (and software tools for helping to use these systems) capable of implementing solutions to problems in all three of those domains simultaneously. These systems are used to explore and implement these cross domain solutions to difficult problems. The earlier work was involved with simply applying floating-gate technology to improving the building blocks of digital systems. Through that early work a new logic family built from floating-gate transistors was discovered, a Logical Effort compatible power analysis technique was developed, and low power floating-gate based FPGA was implemented. This work was then merged with existing research in the group involving solving problems using reconfigurable analog, and neuromorphic techniques. Thus converging on the mentioned systems that allow one to solve problems using techniques from all three domains: analog, neuromorphic, and digital.
Advisors/Committee Members: Hasler, Jennifer (advisor), Wang, Hua (committee member), Lanterman, Aaron (committee member), Mukhopadhyay, Saibal (committee member), Minch, Brad (committee member).
Subjects/Keywords: Floating-gate; Reconfigurable; Digital; Analog processing; Field programmable gate arrays
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APA (6th Edition):
Wunderlich, R. B. (2014). Floating-gate-programmable and reconfigurable, digital and mixed-signal systems. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/51815
Chicago Manual of Style (16th Edition):
Wunderlich, Richard Bryan. “Floating-gate-programmable and reconfigurable, digital and mixed-signal systems.” 2014. Doctoral Dissertation, Georgia Tech. Accessed January 17, 2021.
http://hdl.handle.net/1853/51815.
MLA Handbook (7th Edition):
Wunderlich, Richard Bryan. “Floating-gate-programmable and reconfigurable, digital and mixed-signal systems.” 2014. Web. 17 Jan 2021.
Vancouver:
Wunderlich RB. Floating-gate-programmable and reconfigurable, digital and mixed-signal systems. [Internet] [Doctoral dissertation]. Georgia Tech; 2014. [cited 2021 Jan 17].
Available from: http://hdl.handle.net/1853/51815.
Council of Science Editors:
Wunderlich RB. Floating-gate-programmable and reconfigurable, digital and mixed-signal systems. [Doctoral Dissertation]. Georgia Tech; 2014. Available from: http://hdl.handle.net/1853/51815
Georgia Tech
7.
Nguyen, Van.
Non-contact physiologically related motion sensing with ultra-wideband impulse radar.
Degree: PhD, Electrical and Computer Engineering, 2016, Georgia Tech
URL: http://hdl.handle.net/1853/59142
► Impulse Radio Ultra-wideband (IR-UWB) radar is a promising tool for non-contact, non-invasive sensing of physiological parameters, which could be valuable in identifying or preventing clinical…
(more)
▼ Impulse Radio Ultra-wideband (IR-UWB) radar is a promising tool for non-contact, non-invasive sensing of physiological parameters, which could be valuable in identifying or preventing clinical disorders. This research investigates the use of IR-UWB radar in monitoring of physiological parameters, e.g. respiration rate, heart rate, and cardiopulmonary chest wall displacement. The dissertation has two major parts. The first part consists of novel theoretical analysis of the radar received signal due to arbitrary periodic displacement of the heart and lungs. The second part consists of algorithm development, where estimation methods are developed to estimate a range of physiological parameters. In particular, for heart rate detection, estimation algorithms ranging from heuristic regime to sequential Bayesian filtering have been developed, leveraging HR harmonics, tracking, and motion artifact removal. The performance of these algorithms are evaluated with real-world experimental data from human subjects lying on a bed with an under-the-mattress UWB radar. This research is also concerned with the reconstruction of chest wall displacement from the IR-UWB radar signal. There are several novel aspects of the proposed method. First, only a tiny fraction of the bandwidth of the received spectrum is needed to reconstruct the entire displacement waveform. Since only a tiny fraction of the UWB bandwidth needs to be retained, the required sampling rate is substantially reduced. Second, the maximum likelihood estimator of the displacement is obtained, and the bias and Cramer-Rao lower bound are derived. Finally, in order to further improve estimation accuracy, a denoising method such as empirical mode decomposition is applied on the maximum likelihood estimates. This dissertation also proposes a method that quantifies body-macro movement, such as limb movement, and detects a posture change. The method is set up as a hypothesis test, where the decision threshold between the null and alternative hypotheses are calculated from statistics obtained from experimental data.
Advisors/Committee Members: Weitnauer, Mary Ann (advisor), Lanterman, Aaron D. (committee member), Vidakovic, Brani (committee member), Anderson, David V. (committee member), Inan, Omer T. (committee member).
Subjects/Keywords: Non-contact; UWB radar; Heart rate estimation; Respiration rate estimation; Chest displacement estimation; Posture change detection; Vital signs monitoring
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APA (6th Edition):
Nguyen, V. (2016). Non-contact physiologically related motion sensing with ultra-wideband impulse radar. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/59142
Chicago Manual of Style (16th Edition):
Nguyen, Van. “Non-contact physiologically related motion sensing with ultra-wideband impulse radar.” 2016. Doctoral Dissertation, Georgia Tech. Accessed January 17, 2021.
http://hdl.handle.net/1853/59142.
MLA Handbook (7th Edition):
Nguyen, Van. “Non-contact physiologically related motion sensing with ultra-wideband impulse radar.” 2016. Web. 17 Jan 2021.
Vancouver:
Nguyen V. Non-contact physiologically related motion sensing with ultra-wideband impulse radar. [Internet] [Doctoral dissertation]. Georgia Tech; 2016. [cited 2021 Jan 17].
Available from: http://hdl.handle.net/1853/59142.
Council of Science Editors:
Nguyen V. Non-contact physiologically related motion sensing with ultra-wideband impulse radar. [Doctoral Dissertation]. Georgia Tech; 2016. Available from: http://hdl.handle.net/1853/59142
Georgia Tech
8.
Kim, Sihwan.
Low power mixed signal system design environment using floating-gate FPAAs.
Degree: PhD, Electrical and Computer Engineering, 2018, Georgia Tech
URL: http://hdl.handle.net/1853/59923
► The objective of this research is to create a low-power mixed-signal system design environment using FG FPAAs. To achieve this, my research focused on implementing…
(more)
▼ The objective of this research is to create a low-power mixed-signal system design environment using FG FPAAs. To achieve this, my research focused on implementing a compact hardware, developing algorithms and tools, and establishing a solid calibration flow. The first phase, implementing a compact hardware, involved developing FG SoC FPAAs including an FG programming infrastructure and built-in self test circuits, as well as designing smaller test boards to enable IoT embedded applications. Secondly, FG FPAA systems need to provide interfacing tools for application designers. This required a synthesis toolset generating a switch list from the user's design and an FG programming algorithm compatible with the SoC FPAAs. Lastly, a solid calibration flow solved the variation problem of each IC, which has been an issue in typical analog system designs. By coordinating the development of these three phases, it has been enabled to provide a powerful low-power system design environment, where system engineers consider analog circuits as black boxes, so they can enjoy the design and implementation of higher level applications, as if they are designing digital systems.
Advisors/Committee Members: Hasler, Jennifer (advisor), Mukhopadhyay, Saibal (committee member), Lim, Sung Kyu (committee member), Lanterman, Aaron D. (committee member), Koziol, Scott (committee member).
Subjects/Keywords: Floating-gate; FG; Field programmable analog array (FPAA)
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APA (6th Edition):
Kim, S. (2018). Low power mixed signal system design environment using floating-gate FPAAs. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/59923
Chicago Manual of Style (16th Edition):
Kim, Sihwan. “Low power mixed signal system design environment using floating-gate FPAAs.” 2018. Doctoral Dissertation, Georgia Tech. Accessed January 17, 2021.
http://hdl.handle.net/1853/59923.
MLA Handbook (7th Edition):
Kim, Sihwan. “Low power mixed signal system design environment using floating-gate FPAAs.” 2018. Web. 17 Jan 2021.
Vancouver:
Kim S. Low power mixed signal system design environment using floating-gate FPAAs. [Internet] [Doctoral dissertation]. Georgia Tech; 2018. [cited 2021 Jan 17].
Available from: http://hdl.handle.net/1853/59923.
Council of Science Editors:
Kim S. Low power mixed signal system design environment using floating-gate FPAAs. [Doctoral Dissertation]. Georgia Tech; 2018. Available from: http://hdl.handle.net/1853/59923
Georgia Tech
9.
Nease, Stephen H.
Neural and analog computation on reconfigurable mixed-signal platforms.
Degree: PhD, Electrical and Computer Engineering, 2014, Georgia Tech
URL: http://hdl.handle.net/1853/53999
► This work addresses neural and analog computation on reconfigurable mixed-signal platforms. Many engineered systems could gain tremendous benefits by emulating neural systems. For example, neural…
(more)
▼ This work addresses neural and analog computation on reconfigurable mixed-signal platforms.
Many engineered systems could gain tremendous benefits by emulating neural systems.
For example, neural systems are incredibly power efficient and fault-tolerant.
They are also capable of types of computation that we cannot yet match with conventional computers.
Neuromorphic engineers typically implement neural computation using analog circuits because they are low-power and naturally model some aspects of neurobiology.
One problem with analog circuits is that they are typically inflexible.
To address this shortcoming, our lab has developed reconfigurable analog systems known as Field Programmable Analog Arrays (FPAAs).
This dissertation consists of two main parts.
The first is the implementation of neural and analog circuits on FPAAs.
We first implemented an adaptive winner-take-all circuit, which could model attention in neural systems.
Next, we modeled the dendrite, which is the conductive tissue that relays inputs from synapses to the neuron cell body.
We also implemented a subtractive music synthesizer, perhaps providing the electronic music synthesis community with a good platform for experimentation.
Finally, we conducted a number of neural learning experiments on a neuromorphic platform.
The second part of this dissertation includes design aspects of new FPAAs, including configurable blocks that can be used as current-mode DACs in a digitally-enhanced FPAA, the RASP 2.9v.
We also consider the design of a new neuromorphic platform containing 256 neurons and over 200,000 synapses, many with learning capability.
We also created an active delay line that could be used for beamforming or FIR filter applications.
In summary, this work adds to the field of reconfigurable systems by both showing how to implement circuits with them and creating new systems based on lessons learned while working with previous systems.
Advisors/Committee Members: Ghovanloo, Maysam (advisor), Hasler, Jennifer (committee member), Lanterman, Aaron (committee member), Wang, Hua (committee member), Minch, Bradley (committee member).
Subjects/Keywords: Neuromorphic; Field programmable analog array; Analog signal processing
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APA (6th Edition):
Nease, S. H. (2014). Neural and analog computation on reconfigurable mixed-signal platforms. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/53999
Chicago Manual of Style (16th Edition):
Nease, Stephen H. “Neural and analog computation on reconfigurable mixed-signal platforms.” 2014. Doctoral Dissertation, Georgia Tech. Accessed January 17, 2021.
http://hdl.handle.net/1853/53999.
MLA Handbook (7th Edition):
Nease, Stephen H. “Neural and analog computation on reconfigurable mixed-signal platforms.” 2014. Web. 17 Jan 2021.
Vancouver:
Nease SH. Neural and analog computation on reconfigurable mixed-signal platforms. [Internet] [Doctoral dissertation]. Georgia Tech; 2014. [cited 2021 Jan 17].
Available from: http://hdl.handle.net/1853/53999.
Council of Science Editors:
Nease SH. Neural and analog computation on reconfigurable mixed-signal platforms. [Doctoral Dissertation]. Georgia Tech; 2014. Available from: http://hdl.handle.net/1853/53999
Georgia Tech
10.
Azmat, Shoaib.
Multilayer background modeling under occlusions for spatio-temporal scene analysis.
Degree: PhD, Electrical and Computer Engineering, 2014, Georgia Tech
URL: http://hdl.handle.net/1853/54005
► This dissertation presents an efficient multilayer background modeling approach to distinguish among midground objects, the objects whose existence occurs over varying time scales between the…
(more)
▼ This dissertation presents an efficient multilayer background modeling approach to distinguish among midground objects, the objects whose existence occurs over varying time scales between the extremes of short-term ephemeral appearances (foreground) and long-term stationary persistences (background). Traditional background modeling separates a given scene into foreground and background regions. However, the real world can be much more complex than this simple classification, and object appearance events often occur over varying time scales. There are situations in which objects appear on the scene at different points in time and become stationary; these objects can get occluded by one another, and can change positions or be removed from the scene. Inability to deal with such scenarios involving midground objects results in errors, such as ghost objects, miss-detection of occluding objects, aliasing caused by the objects that have left the scene but are not removed from the model, and new objects’ detection when existing objects are displaced. Modeling temporal layers of multiple objects allows us to overcome these errors, and enables the surveillance and summarization of scenes containing multiple midground objects.
Advisors/Committee Members: Wills, Linda (advisor), Wills, Scott (advisor), Hamblen, James (committee member), Hong, Bo (committee member), Lanterman, Aaron (committee member), Vetter, Jeffrey (committee member).
Subjects/Keywords: Video surveillance; Multilayer background modeling; Adaptive background modeling; Temporal multimodal mean; Occlusion reasoning; Appearance model; Video summarization; Low-power integrated GPU; Embedded smart camera; Spatio-temporal scene analysis
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APA (6th Edition):
Azmat, S. (2014). Multilayer background modeling under occlusions for spatio-temporal scene analysis. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/54005
Chicago Manual of Style (16th Edition):
Azmat, Shoaib. “Multilayer background modeling under occlusions for spatio-temporal scene analysis.” 2014. Doctoral Dissertation, Georgia Tech. Accessed January 17, 2021.
http://hdl.handle.net/1853/54005.
MLA Handbook (7th Edition):
Azmat, Shoaib. “Multilayer background modeling under occlusions for spatio-temporal scene analysis.” 2014. Web. 17 Jan 2021.
Vancouver:
Azmat S. Multilayer background modeling under occlusions for spatio-temporal scene analysis. [Internet] [Doctoral dissertation]. Georgia Tech; 2014. [cited 2021 Jan 17].
Available from: http://hdl.handle.net/1853/54005.
Council of Science Editors:
Azmat S. Multilayer background modeling under occlusions for spatio-temporal scene analysis. [Doctoral Dissertation]. Georgia Tech; 2014. Available from: http://hdl.handle.net/1853/54005
Georgia Tech
11.
Reed, Jenny Lynn.
Theoretical performance bounds for the estimation of drop size distribution and rain rate.
Degree: PhD, Electrical and Computer Engineering, 2016, Georgia Tech
URL: http://hdl.handle.net/1853/56286
► Radar is an indispensable tool in the observation, analysis, and prediction of weather. The Weather Surveillance Radar 1988-Doppler (WSR-88D) is the primary source of weather…
(more)
▼ Radar is an indispensable tool in the observation, analysis, and prediction of weather. The Weather Surveillance Radar 1988-Doppler (WSR-88D) is the primary source of weather radar data in the United States (U.S.), providing dual-polarimetric (dual-pol) radar measurements for the inference of meteorological phenomena. A classic estimation problem in radar meteorology is the estimation of rain rate. Taking this problem one step further, a number of approaches have been suggested for estimating the parameters of the drop size distribution (DSD) of rain (or clouds). While various methodologies have been suggested for rain rate and DSD estimation, and numerous studies have evaluated these estimators, no fundamental limit has yet been established for how well these estimators could perform given the available dual-pol data. This dissertation derives fundamental performance bounds for the variance of any unbiased estimator of the DSD parameters, given the dual-pol measurements recorded by operational weather radars, e.g., the WSR-88D. This dissertation further establishes similar bounds for the estimation of rain rate and liquid water content (LWC). These bounds and their implications are examined in detail to infer the efficacy of the dual-pol measurements provided by the WSR-88D for the estimation of the DSD parameters, rain rate, and LWC.
Advisors/Committee Members: Lanterman, Aaron (advisor), Richards, Mark (committee member), Williams, Douglas (committee member), Durgin, Gregory (committee member), Vidakovic, Brani (committee member).
Subjects/Keywords: Radar; Weather; Meteorology; Drop size distribution; Dual-polarization; Rain rate; Cramer-Rao lower bound; Variance bounds; Maximum likelihood
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APA (6th Edition):
Reed, J. L. (2016). Theoretical performance bounds for the estimation of drop size distribution and rain rate. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/56286
Chicago Manual of Style (16th Edition):
Reed, Jenny Lynn. “Theoretical performance bounds for the estimation of drop size distribution and rain rate.” 2016. Doctoral Dissertation, Georgia Tech. Accessed January 17, 2021.
http://hdl.handle.net/1853/56286.
MLA Handbook (7th Edition):
Reed, Jenny Lynn. “Theoretical performance bounds for the estimation of drop size distribution and rain rate.” 2016. Web. 17 Jan 2021.
Vancouver:
Reed JL. Theoretical performance bounds for the estimation of drop size distribution and rain rate. [Internet] [Doctoral dissertation]. Georgia Tech; 2016. [cited 2021 Jan 17].
Available from: http://hdl.handle.net/1853/56286.
Council of Science Editors:
Reed JL. Theoretical performance bounds for the estimation of drop size distribution and rain rate. [Doctoral Dissertation]. Georgia Tech; 2016. Available from: http://hdl.handle.net/1853/56286
12.
Shaban, Fahad.
Application of L1 reconstruction of sparse signals to ambiguity resolution in radar.
Degree: MS, Electrical and Computer Engineering, 2013, Georgia Tech
URL: http://hdl.handle.net/1853/47637
► The objective of the proposed research is to develop a new algorithm for range and Doppler ambiguity resolution in radar detection data using L1 minimization…
(more)
▼ The objective of the proposed research is to develop a new algorithm for range and Doppler ambiguity resolution in radar detection data using L1 minimization methods for sparse signals and to investigate the properties of such techniques. This novel approach to ambiguity resolution makes use of the sparse measurement structure of the post-detection data in multiple pulse repetition frequency radars and the resulting equivalence of the computationally intractable L0 minimization and the surrogate L1 minimization methods. The ambiguity resolution problem is cast as a linear system of equations which is then solved for the unique sparse solution in the absence of errors. It is shown that the new technique successfully resolves range and Doppler ambiguities and the recovery is exact in the ideal case of no errors in the system. The behavior of the technique is then investigated in the presence of real world data errors encountered in radar measurement and detection process. Examples of such errors include blind zone effects, collisions, false alarms and missed detections. It is shown that the mathematical model consisting of a linear system of equations developed for the ideal case can be adjusted to account for data errors. Empirical results show that the L1 minimization approach also works well in the presence of errors with minor extensions to the algorithm. Several examples are presented to demonstrate the successful implementation of the new technique for range and Doppler ambiguity resolution in pulse Doppler radars.
Advisors/Committee Members: Richards, Mark (Committee Chair), Lanterman, Aaron (Committee Member), Romberg, Justin (Committee Member).
Subjects/Keywords: Ambiguity resolution; Pulse Doppler radars; Sparse reconstruction; Multiple PRFs; L1 minimization; Radar; Signal detection; Sparse matrices
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APA (6th Edition):
Shaban, F. (2013). Application of L1 reconstruction of sparse signals to ambiguity resolution in radar. (Masters Thesis). Georgia Tech. Retrieved from http://hdl.handle.net/1853/47637
Chicago Manual of Style (16th Edition):
Shaban, Fahad. “Application of L1 reconstruction of sparse signals to ambiguity resolution in radar.” 2013. Masters Thesis, Georgia Tech. Accessed January 17, 2021.
http://hdl.handle.net/1853/47637.
MLA Handbook (7th Edition):
Shaban, Fahad. “Application of L1 reconstruction of sparse signals to ambiguity resolution in radar.” 2013. Web. 17 Jan 2021.
Vancouver:
Shaban F. Application of L1 reconstruction of sparse signals to ambiguity resolution in radar. [Internet] [Masters thesis]. Georgia Tech; 2013. [cited 2021 Jan 17].
Available from: http://hdl.handle.net/1853/47637.
Council of Science Editors:
Shaban F. Application of L1 reconstruction of sparse signals to ambiguity resolution in radar. [Masters Thesis]. Georgia Tech; 2013. Available from: http://hdl.handle.net/1853/47637
13.
Howe, Christopher David.
Analog synthesizers in the classroom: How creative play, musical composition, and project-based learning can enhance STEM standard literacy and self-efficacy.
Degree: MS, Music, 2015, Georgia Tech
URL: http://hdl.handle.net/1853/53614
► The state of STEM education in America's high schools is currently in flux, with billions annually being poured into the NSF to increase national STEM…
(more)
▼ The state of STEM education in America's high schools is currently in flux, with billions annually being poured into the NSF to increase national STEM literacy. Hands-on project-based learning interventions in the STEM classroom are ubiquitous but tend to focus on robotics or competition based curriculums. These curricula do not address musical creativity or cultural relevancy to reach under-represented or disinterested groups. By utilizing an analog synthesizer for STEM learning standards this research aims to engage students that may otherwise lack confidence in the field. By incorporating the Maker Movement, a STEAM architecture, and culturally relevant musical examples, this study’s goal to build both self-efficacy and literacy in STEM within under-represented groups through hands-on exercises with a Moog analog synthesizer, specifically the Moog Werkstatt.
A quasi-experimental one-group pre-test/post-test design was crafted to determine study validity, and has been implemented in three separate studies. Several age demographics were selected across a variety of classroom models and teaching style. The purpose of this wide net was to explore where a tool like the Werkstatt and its accompanying curriculum would have the biggest impact. Results show that this curriculum and technique are largely ineffective in an inverted Music elective classroom. However, in the STEM classroom, literacy and confidence were built across genders, with females showing greater increases in engineering confidence and music technology interest than their male counterparts.
Advisors/Committee Members: Freeman, Jason (advisor), Clark, Frank (committee member), Lanterman, Aaron D. (committee member).
Subjects/Keywords: STEM; STEAM; Maker culture; DIY; Moog; arduino; project-based learning; constructionism; Synthesizer:analog; Music; Music education; Music technology
…this research is the work of Jason Freeman at Georgia
Tech. EarSketch, a computational music… …thon with the Moog
Werkstatt was held at Georgia Tech (“Hackathon helps students invent… …library in C/C++, and website design and development. The
focus of my thesis research at Georgia… …Tech is measuring the effectiveness of these
materials in a formal classroom setting in both…
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APA (6th Edition):
Howe, C. D. (2015). Analog synthesizers in the classroom: How creative play, musical composition, and project-based learning can enhance STEM standard literacy and self-efficacy. (Masters Thesis). Georgia Tech. Retrieved from http://hdl.handle.net/1853/53614
Chicago Manual of Style (16th Edition):
Howe, Christopher David. “Analog synthesizers in the classroom: How creative play, musical composition, and project-based learning can enhance STEM standard literacy and self-efficacy.” 2015. Masters Thesis, Georgia Tech. Accessed January 17, 2021.
http://hdl.handle.net/1853/53614.
MLA Handbook (7th Edition):
Howe, Christopher David. “Analog synthesizers in the classroom: How creative play, musical composition, and project-based learning can enhance STEM standard literacy and self-efficacy.” 2015. Web. 17 Jan 2021.
Vancouver:
Howe CD. Analog synthesizers in the classroom: How creative play, musical composition, and project-based learning can enhance STEM standard literacy and self-efficacy. [Internet] [Masters thesis]. Georgia Tech; 2015. [cited 2021 Jan 17].
Available from: http://hdl.handle.net/1853/53614.
Council of Science Editors:
Howe CD. Analog synthesizers in the classroom: How creative play, musical composition, and project-based learning can enhance STEM standard literacy and self-efficacy. [Masters Thesis]. Georgia Tech; 2015. Available from: http://hdl.handle.net/1853/53614
14.
Rashidi, Abbas.
Evaluating the performance of machine-learning techniques for recognizing construction materials in digital images.
Degree: MS, Electrical and Computer Engineering, 2013, Georgia Tech
URL: http://hdl.handle.net/1853/49122
► Digital images acquired at construction sites contain valuable information useful for various applications including As-built documentation of building elements, effective progress monitoring, structural damage assessment,…
(more)
▼ Digital images acquired at construction sites contain valuable information useful for various applications including As-built documentation of building elements, effective progress monitoring, structural damage assessment, and quality control of construction material. As a result there is an increasing need for effective methods to recognize different building materials in digital images and videos.
Pattern recognition is a mature field within the area of image processing; however, its application in the area of civil engineering and building construction is only recent.
In order to develop any robust image recognition method, it is necessary to choose the optimal machine learning algorithm.
To generate a robust color model for building material detection in an outdoor construction environment, a comparative analysis of three generative and discriminative machine learning algorithms, namely, multilayer perceptron (MLP), radial basis function (RBF), and support vector machines (SVMs), is conducted. The main focus of this study is on three classes of building materials: concrete, plywood, and brick.
For training purposes a large-size data set including hundreds of images is collected. The comparison study is conducted by implementing necessary algorithms in MATLAB and testing over hundreds of construction-site images. To evaluate the performance of each technique, the results are compared with a manual classification of building materials. In order to better assess the performance of each technique, experiments are conducted by taking pictures under various realistic jobsite conditions, e.g., different ranges of image resolutions, different distance of camera from object, and different types of cameras.
Advisors/Committee Members: Citrin, David S. (advisor), Lanterman, Aaron (committee member), Ashuri, Baabak (committee member).
Subjects/Keywords: Image processing; Construction material; Brick; Concrete; Plywood; Machine learning; Support vector machines; Pattern perception; Perceptrons
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APA (6th Edition):
Rashidi, A. (2013). Evaluating the performance of machine-learning techniques for recognizing construction materials in digital images. (Masters Thesis). Georgia Tech. Retrieved from http://hdl.handle.net/1853/49122
Chicago Manual of Style (16th Edition):
Rashidi, Abbas. “Evaluating the performance of machine-learning techniques for recognizing construction materials in digital images.” 2013. Masters Thesis, Georgia Tech. Accessed January 17, 2021.
http://hdl.handle.net/1853/49122.
MLA Handbook (7th Edition):
Rashidi, Abbas. “Evaluating the performance of machine-learning techniques for recognizing construction materials in digital images.” 2013. Web. 17 Jan 2021.
Vancouver:
Rashidi A. Evaluating the performance of machine-learning techniques for recognizing construction materials in digital images. [Internet] [Masters thesis]. Georgia Tech; 2013. [cited 2021 Jan 17].
Available from: http://hdl.handle.net/1853/49122.
Council of Science Editors:
Rashidi A. Evaluating the performance of machine-learning techniques for recognizing construction materials in digital images. [Masters Thesis]. Georgia Tech; 2013. Available from: http://hdl.handle.net/1853/49122
15.
Wong, Lok S.
Optimal partitions for the fast multipole method.
Degree: MS, Electrical and Computer Engineering, 2016, Georgia Tech
URL: http://hdl.handle.net/1853/56360
► The fast multipole method is an algorithm first developed to approximately solve the N-body problem in linear time. Part of the FMM involves recursively partitioning…
(more)
▼ The fast multipole method is an algorithm first developed to approximately solve the N-body problem in linear time. Part of the FMM involves recursively partitioning a region of source points into cells. Insight from studying lattices and covering problems leads to new, more efficient partitions for the FMM. New partitions are designed to reduce near-field and far-field calculations. Results from simulations show significant computation time reduction with little to no additional error in many cases.
Advisors/Committee Members: Barnes, Christopher (advisor), Romberg, Justin (committee member), Lanterman, Aaron (committee member).
Subjects/Keywords: Fast multipole method; Partition
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APA (6th Edition):
Wong, L. S. (2016). Optimal partitions for the fast multipole method. (Masters Thesis). Georgia Tech. Retrieved from http://hdl.handle.net/1853/56360
Chicago Manual of Style (16th Edition):
Wong, Lok S. “Optimal partitions for the fast multipole method.” 2016. Masters Thesis, Georgia Tech. Accessed January 17, 2021.
http://hdl.handle.net/1853/56360.
MLA Handbook (7th Edition):
Wong, Lok S. “Optimal partitions for the fast multipole method.” 2016. Web. 17 Jan 2021.
Vancouver:
Wong LS. Optimal partitions for the fast multipole method. [Internet] [Masters thesis]. Georgia Tech; 2016. [cited 2021 Jan 17].
Available from: http://hdl.handle.net/1853/56360.
Council of Science Editors:
Wong LS. Optimal partitions for the fast multipole method. [Masters Thesis]. Georgia Tech; 2016. Available from: http://hdl.handle.net/1853/56360
16.
Kagie, Matthew Joseph.
Time-of-arrival estimation for saturated optical transients using censored probabilistic models.
Degree: MS, Electrical and Computer Engineering, 2016, Georgia Tech
URL: http://hdl.handle.net/1853/56365
► The objective of the proposed research is to estimate the time-of-arrival of a transient optical signal subjected to a particular type of nonlinear distortion. The…
(more)
▼ The objective of the proposed research is to estimate the time-of-arrival of a transient optical signal subjected to a particular type of nonlinear distortion. The limited dynamic range of optical sensors can result in nonlinear distortion when measuring extreme transient events, such as lightning. To deal with saturated signals, we employ censored probabilistic models to develop maximum-likelihood procedures for estimating the time-of-arrival of lightning strikes, along with associated nuisance parameters. The received signal is modeled as a realization of a Poisson point process characterized by parametric models of a lightning strike's time-varying intensity. The models are extracted from the FORTÉ lighting database via machine learning techniques. Using Monte Carlo simulations, we compare the variances of different algorithms as a function of signal magnitude and saturation threshold. We also compare these variances to analytical performance bounds such as the Cramér-Rao lower bound.
Advisors/Committee Members: Lanterman, Aaron (advisor), Romberg, Justin (committee member), Citrin, David (committee member).
Subjects/Keywords: Expectation maximization algorithms; Poisson models; Cramér-Rao bounds; Lightning; Machine learning
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APA (6th Edition):
Kagie, M. J. (2016). Time-of-arrival estimation for saturated optical transients using censored probabilistic models. (Masters Thesis). Georgia Tech. Retrieved from http://hdl.handle.net/1853/56365
Chicago Manual of Style (16th Edition):
Kagie, Matthew Joseph. “Time-of-arrival estimation for saturated optical transients using censored probabilistic models.” 2016. Masters Thesis, Georgia Tech. Accessed January 17, 2021.
http://hdl.handle.net/1853/56365.
MLA Handbook (7th Edition):
Kagie, Matthew Joseph. “Time-of-arrival estimation for saturated optical transients using censored probabilistic models.” 2016. Web. 17 Jan 2021.
Vancouver:
Kagie MJ. Time-of-arrival estimation for saturated optical transients using censored probabilistic models. [Internet] [Masters thesis]. Georgia Tech; 2016. [cited 2021 Jan 17].
Available from: http://hdl.handle.net/1853/56365.
Council of Science Editors:
Kagie MJ. Time-of-arrival estimation for saturated optical transients using censored probabilistic models. [Masters Thesis]. Georgia Tech; 2016. Available from: http://hdl.handle.net/1853/56365
17.
Mickael, Peter Wahba.
A near field, non-contact vibration detector using giant magnetoresistance sensors.
Degree: MS, Electrical and Computer Engineering, 2018, Georgia Tech
URL: http://hdl.handle.net/1853/60822
► Giant magnetoresistance (GMR) sensors are explored for their use in detecting vibrations. GMR sensors have been widely used in magnetoresistive random-access memory (MRAM), and they…
(more)
▼ Giant magnetoresistance (GMR) sensors are explored for their use in detecting vibrations. GMR sensors have been widely used in magnetoresistive random-access memory (MRAM), and they have the potential to be utilized in many other industries due to their small size and low power consumption. A summary of sensors and transducers used for vibration measurements is given. In addition, an investigation of string vibrations is discussed as the GMR sensors were tested against traditional inductive electric guitar pickups. GMR sensors show a distinct advantage for measuring string vibrations. The GMR device gives an output related to the position of the moving string as opposed to its velocity and displays a flat frequency response. The harmonic spectrum produced is a truer representation of the string dynamics as there is no frequency response introduced by the sensor itself.
Advisors/Committee Members: Kenney, James S. (advisor), Hunt, William D. (committee member), Lanterman, Aaron D. (committee member).
Subjects/Keywords: GMR; Vibration sensing; String vibrations; Electric guitar pickup
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APA (6th Edition):
Mickael, P. W. (2018). A near field, non-contact vibration detector using giant magnetoresistance sensors. (Masters Thesis). Georgia Tech. Retrieved from http://hdl.handle.net/1853/60822
Chicago Manual of Style (16th Edition):
Mickael, Peter Wahba. “A near field, non-contact vibration detector using giant magnetoresistance sensors.” 2018. Masters Thesis, Georgia Tech. Accessed January 17, 2021.
http://hdl.handle.net/1853/60822.
MLA Handbook (7th Edition):
Mickael, Peter Wahba. “A near field, non-contact vibration detector using giant magnetoresistance sensors.” 2018. Web. 17 Jan 2021.
Vancouver:
Mickael PW. A near field, non-contact vibration detector using giant magnetoresistance sensors. [Internet] [Masters thesis]. Georgia Tech; 2018. [cited 2021 Jan 17].
Available from: http://hdl.handle.net/1853/60822.
Council of Science Editors:
Mickael PW. A near field, non-contact vibration detector using giant magnetoresistance sensors. [Masters Thesis]. Georgia Tech; 2018. Available from: http://hdl.handle.net/1853/60822
Georgia Tech
18.
Swenson, Brian Paul.
Techniques to improve the performance of large-scale discrete-event simulation.
Degree: PhD, Electrical and Computer Engineering, 2015, Georgia Tech
URL: http://hdl.handle.net/1853/53887
► Discrete-event simulation is a commonly used technique to model changes within a complex physical systems as a series of events that occur at discrete points…
(more)
▼ Discrete-event simulation is a commonly used technique to model changes
within a complex physical systems as a series of events that occur at discrete points
of time. As the complexity of the physical system being modeled increases, the
simulator can reach a point where it is no longer feasible for it to run efficiently on one
computing resource. A common solution is to break the physical system into multiple
logical processes. When breaking a simulation over multiple computing nodes, care
must be taken to ensure the results obtained are the same as would be obtained from
a non-distributed simulation. This is done by ensuring that the events processed
in each individual logical process are processed in chronological order. The task is
complicated by the fact that the computing nodes will be exchanging timestamped
messages and will often be operating at different points of simulation time. Therefore,
highly efficient synchronization methods must be used. It is also important that the
logical processes have a capable means to transport messages among themselves or
the benefits of parallelization will be lost.
The objective of this dissertation is to design, develop, test, and evaluate
tech-
niques to improve the performance of large-scale discrete-event simulations. The
techniques include improvements in messaging passing, state management, and time
synchronization. Along with specific implementation improvements, we also examine
techniques on how to effectively make use of resources such as shared memory and
graphical processing units.
Advisors/Committee Members: Riley, George F. (advisor), Blough, Douglas M. (committee member), Lanterman, Aaron D. (committee member), Beyah, Raheem A. (committee member), Fujimoto, Richard F. (committee member).
Subjects/Keywords: Simulation; GPU
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APA (6th Edition):
Swenson, B. P. (2015). Techniques to improve the performance of large-scale discrete-event simulation. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/53887
Chicago Manual of Style (16th Edition):
Swenson, Brian Paul. “Techniques to improve the performance of large-scale discrete-event simulation.” 2015. Doctoral Dissertation, Georgia Tech. Accessed January 17, 2021.
http://hdl.handle.net/1853/53887.
MLA Handbook (7th Edition):
Swenson, Brian Paul. “Techniques to improve the performance of large-scale discrete-event simulation.” 2015. Web. 17 Jan 2021.
Vancouver:
Swenson BP. Techniques to improve the performance of large-scale discrete-event simulation. [Internet] [Doctoral dissertation]. Georgia Tech; 2015. [cited 2021 Jan 17].
Available from: http://hdl.handle.net/1853/53887.
Council of Science Editors:
Swenson BP. Techniques to improve the performance of large-scale discrete-event simulation. [Doctoral Dissertation]. Georgia Tech; 2015. Available from: http://hdl.handle.net/1853/53887
Georgia Tech
19.
Paulus, Audrey S.
Improved target detection through extended-dwell, multichannel radar.
Degree: PhD, Electrical and Computer Engineering, 2014, Georgia Tech
URL: http://hdl.handle.net/1853/54279
► The detection of weak, ground-moving targets can be improved through effective utilization of additional target signal energy collected over an extended dwell time. The signal…
(more)
▼ The detection of weak, ground-moving targets can be improved through effective utilization of additional target signal energy collected over an extended dwell time. The signal model used in conventional radar processing limits integration of signal energy over an extended dwell. Two solutions that consider the complexity of the extended-dwell signal model and effectively combine signal energy collected over a long dwell are presented. The first solution is a single-channel algorithm that provides an estimate of the optimal detector to maximize output signal-to-interference-plus-noise ratio for the extended dwell time signal. Rather than searching for the optimal detector in an intractably large filter bank that contains all combinations of phase components, the single-channel algorithm projects dictionary entries against the data to estimate the signal’s linear and nonlinear phase components sequentially with small, phase-specific dictionaries in a multistage process. When used as the detector, the signal model formed from the estimated phase components yields near optimal performance for a wide range of target parameters for dwell times up to four seconds. In comparison, conventional radar processing methods are limited to an integration time of approximately 100 milliseconds. The second solution is a multichannel, multistage algorithm based on element-space pre-Doppler space-time-adaptive processing with two modifications that make it suitable for detection of weak targets whose energy is collected over an extended dwell time. The multichannel solution detects targets with lower radial velocities at significantly lower signal-to-noise ratios (SNRs) than conventional radar processing methods. The decrease in required input SNR for the multichannel solution as compared to conventional methods nearly doubles the detection range for a typical target of interest. Future related research includes extension of these concepts to other radar applications and investigation of algorithm performance for the multiple-target scenario.
Advisors/Committee Members: Williams, Douglas B. (advisor), Melvin, William L. (advisor), Richards, Mark A. (committee member), Barnes, Christopher F. (committee member), Lanterman, Aaron D. (committee member), Jacobs, Laurence J. (committee member).
Subjects/Keywords: Target detection; Multichannel radar; Ground moving target indication; Radar signal processing; Space-time-adaptive processing
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APA (6th Edition):
Paulus, A. S. (2014). Improved target detection through extended-dwell, multichannel radar. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/54279
Chicago Manual of Style (16th Edition):
Paulus, Audrey S. “Improved target detection through extended-dwell, multichannel radar.” 2014. Doctoral Dissertation, Georgia Tech. Accessed January 17, 2021.
http://hdl.handle.net/1853/54279.
MLA Handbook (7th Edition):
Paulus, Audrey S. “Improved target detection through extended-dwell, multichannel radar.” 2014. Web. 17 Jan 2021.
Vancouver:
Paulus AS. Improved target detection through extended-dwell, multichannel radar. [Internet] [Doctoral dissertation]. Georgia Tech; 2014. [cited 2021 Jan 17].
Available from: http://hdl.handle.net/1853/54279.
Council of Science Editors:
Paulus AS. Improved target detection through extended-dwell, multichannel radar. [Doctoral Dissertation]. Georgia Tech; 2014. Available from: http://hdl.handle.net/1853/54279
20.
Chen, Xin.
Load-enhanced lamb wave methods for the in situ detection, localization and characterization of damage.
Degree: PhD, Electrical and Computer Engineering, 2015, Georgia Tech
URL: http://hdl.handle.net/1853/54859
► A load-enhanced methodology has been proposed to enable the in situ detection, localization, and characterization of damage in metallic plate-like structures using Lamb waves. A…
(more)
▼ A load-enhanced methodology has been proposed to enable the in situ detection, localization, and characterization of damage in metallic plate-like structures using Lamb waves. A baseline-free load-differential method using the delay-and-sum imaging algorithm is proposed for defect detection and localization. The term “load-differential” refers to the comparison of recorded ultrasonic signals at various levels of stress. Defect characterization is achieved by incorporating expected scattering information of guided waves interacting with defects into the minimum variance imaging algorithm, and a method for estimating such scattering patterns from the measurements of a sparse transducer array is developed. The estimation method includes signal preprocessing, extracting initial scattering values from baseline subtraction results, and obtaining the complete scattering matrix by applying radial basis function interpolation. The factors that cause estimation errors, such as the shape parameter used to form the basis function and the filling distance used in the interpolation, are discussed.
The estimated scattering patterns from sparse array measurements agree reasonably well with laser wavefield data and are further used in the load-enhanced method. The results from fatigue tests show that the load-enhanced method is capable of detecting cracks, providing reasonable estimates of their localizations and orientations, and discriminating them from drilled holes, disbonds, and fastener tightness variations.
Advisors/Committee Members: Michaels, Jennifer E. (advisor), Michaels, Thomas E. (committee member), Lanterman, Aaron D. (committee member), Durgin, Gregory D. (committee member), Zhang, Ying (committee member), Ruzzene, Massimo (committee member).
Subjects/Keywords: Lamb waves; Scattering; Sparse sensor array; Load-enhanced method; Crack detection; Crack localization; Crack characterization; Complex components; Laser vibrometry
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APA (6th Edition):
Chen, X. (2015). Load-enhanced lamb wave methods for the in situ detection, localization and characterization of damage. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/54859
Chicago Manual of Style (16th Edition):
Chen, Xin. “Load-enhanced lamb wave methods for the in situ detection, localization and characterization of damage.” 2015. Doctoral Dissertation, Georgia Tech. Accessed January 17, 2021.
http://hdl.handle.net/1853/54859.
MLA Handbook (7th Edition):
Chen, Xin. “Load-enhanced lamb wave methods for the in situ detection, localization and characterization of damage.” 2015. Web. 17 Jan 2021.
Vancouver:
Chen X. Load-enhanced lamb wave methods for the in situ detection, localization and characterization of damage. [Internet] [Doctoral dissertation]. Georgia Tech; 2015. [cited 2021 Jan 17].
Available from: http://hdl.handle.net/1853/54859.
Council of Science Editors:
Chen X. Load-enhanced lamb wave methods for the in situ detection, localization and characterization of damage. [Doctoral Dissertation]. Georgia Tech; 2015. Available from: http://hdl.handle.net/1853/54859
Georgia Tech
21.
Kang, Jinwoo.
Face recognition for vehicle personalization.
Degree: PhD, Electrical and Computer Engineering, 2016, Georgia Tech
URL: http://hdl.handle.net/1853/56260
► The objective of this dissertation is to develop a system of practical technologies to implement an illumination robust, consumer grade biometric system based on face…
(more)
▼ The objective of this dissertation is to develop a system of practical technologies to implement an illumination robust, consumer grade biometric system based on face recognition to be used in the automotive market. Most current face recognition systems are compromised in accuracy by ambient illumination changes. Especially outdoor applications including vehicle personalization pose the most challenging environment for face recognition. The point of this research is to investigate practical face recognition used for identity management in order to minimize algorithmic complexity while making the system robust to ambient illumination changes. We start this dissertation by proposing an end-to-end face recognition system using near infrared (NIR) spectrum. The advantage of NIR over visible light is that it is invisible to the human eyes while most CCD and CMOS imaging devices show reasonable response to NIR. Therefore, we can build an unobtrusive night-time vision system with active NIR illumination. In day time the active NIR illumination provides more controlled illumination condition. Next, we propose an end-to-end system with active NIR image differencing which takes the difference between successive image frames, one illuminated and one not illuminated, to make the system more robust on illumination changes. Furthermore, we addresses several aspects of the problem in active NIR image differencing which are motion artifact and noise in the difference frame, namely how to efficiently and more accurately align the illuminated frame and ambient frame, and how to combine information in the difference frame and the illuminated frame. Finally, we conclude the dissertation by citing the contributions of the research and discussing the avenues for future work.
Advisors/Committee Members: Anderson, David V. (advisor), Hayes, Monson H. (advisor), Smith, Mark T. (committee member), Juang, Biing-Hwang (Fred) (committee member), Coyle, Edward J. (committee member), Lanterman, Aaron D. (committee member).
Subjects/Keywords: Face recognition; Face detection; Near infrared; Image alignment; Image fusion
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APA (6th Edition):
Kang, J. (2016). Face recognition for vehicle personalization. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/56260
Chicago Manual of Style (16th Edition):
Kang, Jinwoo. “Face recognition for vehicle personalization.” 2016. Doctoral Dissertation, Georgia Tech. Accessed January 17, 2021.
http://hdl.handle.net/1853/56260.
MLA Handbook (7th Edition):
Kang, Jinwoo. “Face recognition for vehicle personalization.” 2016. Web. 17 Jan 2021.
Vancouver:
Kang J. Face recognition for vehicle personalization. [Internet] [Doctoral dissertation]. Georgia Tech; 2016. [cited 2021 Jan 17].
Available from: http://hdl.handle.net/1853/56260.
Council of Science Editors:
Kang J. Face recognition for vehicle personalization. [Doctoral Dissertation]. Georgia Tech; 2016. Available from: http://hdl.handle.net/1853/56260
22.
Kerr, Andrew.
A model of dynamic compilation for heterogeneous compute platforms.
Degree: PhD, Electrical and Computer Engineering, 2012, Georgia Tech
URL: http://hdl.handle.net/1853/47719
► Trends in computer engineering place renewed emphasis on increasing parallelism and heterogeneity. The rise of parallelism adds an additional dimension to the challenge of portability,…
(more)
▼ Trends in computer engineering place renewed emphasis on increasing parallelism and heterogeneity.
The rise of parallelism adds an additional dimension to the challenge of portability, as
different processors support different notions of parallelism, whether vector parallelism executing
in a few threads on multicore CPUs or large-scale thread hierarchies on GPUs. Thus, software
experiences obstacles to portability and efficient execution beyond differences in instruction sets;
rather, the underlying execution models of radically different architectures may not be compatible.
Dynamic compilation applied to data-parallel heterogeneous architectures presents an abstraction
layer decoupling program representations from optimized binaries, thus enabling portability without
encumbering performance. This dissertation proposes several techniques that extend dynamic
compilation to data-parallel execution models. These contributions include:
- characterization of data-parallel workloads
- machine-independent application metrics
- framework for performance modeling and prediction
- execution model translation for vector processors
- region-based compilation and scheduling
We evaluate these claims via the development of a novel dynamic compilation framework,
GPU Ocelot, with which we execute real-world workloads from GPU computing. This enables
the execution of GPU computing workloads to run efficiently on multicore CPUs, GPUs, and a
functional simulator. We show data-parallel workloads exhibit performance scaling, take advantage
of vector instruction set extensions, and effectively exploit data locality via scheduling which
attempts to maximize control locality.
Advisors/Committee Members: Yalamanchili, Sudha (Committee Chair), Lanterman, Aaron (Committee Member), Pande, Santosh (Committee Member), Richards, Mark (Committee Member), Shamma, Jeff (Committee Member).
Subjects/Keywords: Dynamic compilation; GPU computing; Cuda; Opencl; SIMD; Vector; Multicore; Parallel computing; Parallel computers; Parallel programs (Computer programs); Heterogeneous computing; Parallel processing (Electronic computers); High performance computing
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APA (6th Edition):
Kerr, A. (2012). A model of dynamic compilation for heterogeneous compute platforms. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/47719
Chicago Manual of Style (16th Edition):
Kerr, Andrew. “A model of dynamic compilation for heterogeneous compute platforms.” 2012. Doctoral Dissertation, Georgia Tech. Accessed January 17, 2021.
http://hdl.handle.net/1853/47719.
MLA Handbook (7th Edition):
Kerr, Andrew. “A model of dynamic compilation for heterogeneous compute platforms.” 2012. Web. 17 Jan 2021.
Vancouver:
Kerr A. A model of dynamic compilation for heterogeneous compute platforms. [Internet] [Doctoral dissertation]. Georgia Tech; 2012. [cited 2021 Jan 17].
Available from: http://hdl.handle.net/1853/47719.
Council of Science Editors:
Kerr A. A model of dynamic compilation for heterogeneous compute platforms. [Doctoral Dissertation]. Georgia Tech; 2012. Available from: http://hdl.handle.net/1853/47719
23.
Delmotte, Varinthira Duangudom.
Computational auditory saliency.
Degree: PhD, Electrical and Computer Engineering, 2012, Georgia Tech
URL: http://hdl.handle.net/1853/45888
► The objective of this dissertation research is to identify sounds that grab a listener's attention. These sounds that draw a person's attention are sounds that…
(more)
▼ The objective of this dissertation research is to identify sounds that grab a listener's attention. These sounds that draw a person's attention are sounds that are considered salient. The focus here will be on investigating the role of saliency in the auditory attentional
process. In order to identify these salient sounds, we have developed a computational auditory saliency model inspired by our understanding of the human auditory system and auditory perception.
By identifying salient sounds we can obtain a better understanding of how sounds are processed by the auditory system, and in particular,
the key features contributing to sound salience. Additionally, studying the salience of different auditory stimuli can lead to improvements in the performance of current computational models in
several different areas, by making use of the information obtained about what stands out perceptually to observers in a particular scene.
Auditory saliency also helps to rapidly sort the information present in a complex auditory scene. Since our resources are finite, not all information can be processed equally. We must, therefore, be able to quickly determine the importance of different objects in a scene.
Additionally, an immediate response or decision may be required. In order to respond, the observer needs to know the key elements of the
scene. The issue of saliency is closely related to many different areas, including scene analysis.
The thesis provides a comprehensive look at auditory saliency. It explores the advantages and limitations of using auditory saliency models through different experiments and presents a general computational auditory saliency model that can be used for various applications.
Advisors/Committee Members: Anderson, David (Committee Chair), Bhatti, Pamela (Committee Member), Lanterman, Aaron (Committee Member), Walker, Bruce (Committee Member), Williams, Doug (Committee Member).
Subjects/Keywords: Auditory attention; Perception; Saliency; Auditory scene analysis; Auditory perception; Computational auditory scene analysis; Computer sound processing
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APA (6th Edition):
Delmotte, V. D. (2012). Computational auditory saliency. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/45888
Chicago Manual of Style (16th Edition):
Delmotte, Varinthira Duangudom. “Computational auditory saliency.” 2012. Doctoral Dissertation, Georgia Tech. Accessed January 17, 2021.
http://hdl.handle.net/1853/45888.
MLA Handbook (7th Edition):
Delmotte, Varinthira Duangudom. “Computational auditory saliency.” 2012. Web. 17 Jan 2021.
Vancouver:
Delmotte VD. Computational auditory saliency. [Internet] [Doctoral dissertation]. Georgia Tech; 2012. [cited 2021 Jan 17].
Available from: http://hdl.handle.net/1853/45888.
Council of Science Editors:
Delmotte VD. Computational auditory saliency. [Doctoral Dissertation]. Georgia Tech; 2012. Available from: http://hdl.handle.net/1853/45888
24.
Glass, John David.
Monopulse processing and tracking of maneuvering targets.
Degree: PhD, Electrical and Computer Engineering, 2015, Georgia Tech
URL: http://hdl.handle.net/1853/53556
► As part of the processing of tracking targets, surveillance radars detect the presence of targets and estimate their locations. This dissertation re-examines some of the…
(more)
▼ As part of the processing of tracking targets, surveillance radars detect the presence of targets and estimate their locations. This dissertation re-examines some of the often ignored practical considerations of radar tracking. With the advent of digital computers, modern radars now use sampled versions of received signals for processing. Sampling rates used in practice result in the bin-straddling phenomenon, which is often treated as an undesired loss in signal power. Here, a signal model that explicitly models the sampling process is used in the derivation of the average loglikelihood ratio test (ALLRT), and its detection performance is shown to defeat the bin-straddling losses seen in traditional radar detectors. In monopulse systems, data samples are taken from the sum and difference channels, by which a target direction-of-arrival (DOA) estimate can be formed. Using the same signal model, we derive new estimators for target range, strength, and DOA and show performance benefits over traditional monopulse techniques that are predominant in practice. Since tracking algorithms require an error variance report on target parameter estimates, we propose using the generalized Cramer-Rao lower bound (GCRLB), which is the CRLB evaluated at estimates rather than true values, as an error variance report. We demonstrate the statistical efficiency and variance consistency of the new estimators. With several parameter estimates collected over time, tracking algorithms are used to compute track state estimates and predict future locations. Using agile- beam surveillance radars with programmable energy waveforms, optimal scheduling of radar resources is a topic of interest. In this dissertation, we focus on the energy management considerations of tracking highly maneuverable aircraft. A comparison between two competing interacting multiple model (IMM) filter configurations is made, and a recently proposed unbiased mixing procedure is extended to the case of three modes. Finally, we introduce the radar management operating curve (RMOC), which shows the fundamental tradeoff in radar time and energy, to aid radar designers in the selection of an overall operating signal-to-noise level.
Advisors/Committee Members: Lanterman, Aaron (advisor), Blair, William (committee member), Williams, Doug (committee member), Dieci, Luca (committee member), McClellan, James H. (committee member).
Subjects/Keywords: Monopulse radar; Radar detection; Monopulse processing; Interacting multiple model filter; Radar resource management
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APA (6th Edition):
Glass, J. D. (2015). Monopulse processing and tracking of maneuvering targets. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/53556
Chicago Manual of Style (16th Edition):
Glass, John David. “Monopulse processing and tracking of maneuvering targets.” 2015. Doctoral Dissertation, Georgia Tech. Accessed January 17, 2021.
http://hdl.handle.net/1853/53556.
MLA Handbook (7th Edition):
Glass, John David. “Monopulse processing and tracking of maneuvering targets.” 2015. Web. 17 Jan 2021.
Vancouver:
Glass JD. Monopulse processing and tracking of maneuvering targets. [Internet] [Doctoral dissertation]. Georgia Tech; 2015. [cited 2021 Jan 17].
Available from: http://hdl.handle.net/1853/53556.
Council of Science Editors:
Glass JD. Monopulse processing and tracking of maneuvering targets. [Doctoral Dissertation]. Georgia Tech; 2015. Available from: http://hdl.handle.net/1853/53556
25.
Chiu, Leung Kin.
Efficient audio signal processing for embedded systems.
Degree: PhD, Electrical and Computer Engineering, 2012, Georgia Tech
URL: http://hdl.handle.net/1853/44775
► We investigated two design strategies that would allow us to efficiently process audio signals on embedded systems such as mobile phones and portable electronics. In…
(more)
▼ We investigated two design strategies that would allow us to efficiently process audio signals on embedded systems such as mobile phones and portable electronics. In the first strategy, we exploit properties of the human auditory system to process audio signals. We designed a sound enhancement algorithm to make piezoelectric loudspeakers sound "richer" and "fuller," using a combination of bass extension and dynamic range compression. We also developed an audio energy reduction algorithm for loudspeaker power management by suppressing signal energy below the masking threshold. In the second strategy, we use low-power analog circuits to process the signal before digitizing it. We designed an analog front-end for sound detection and implemented it on a field programmable analog array (FPAA). The sound classifier front-end can be used in a wide range of applications because programmable floating-gate transistors are employed to store classifier weights. Moreover, we incorporated a feature selection algorithm to simplify the analog front-end. A machine learning algorithm AdaBoost is used to select the most relevant features for a particular sound detection application. We also designed the circuits to implement the AdaBoost-based analog classifier.
Advisors/Committee Members: Anderson, David (Committee Chair), Hasler, Jennifer (Committee Member), Hunt, William (Committee Member), Lanterman, Aaron (Committee Member), Minch, Bradley (Committee Member).
Subjects/Keywords: AdaBoost; Programmable analog circuit; Audio feature selection; Analog classifier; Loudspeaker protection; Sound enhancement; Embedded computer systems; Signal processing Digital techniques; Mobile communication systems; Computer sound processing; Piezoelectric devices; Algorithms
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APA (6th Edition):
Chiu, L. K. (2012). Efficient audio signal processing for embedded systems. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/44775
Chicago Manual of Style (16th Edition):
Chiu, Leung Kin. “Efficient audio signal processing for embedded systems.” 2012. Doctoral Dissertation, Georgia Tech. Accessed January 17, 2021.
http://hdl.handle.net/1853/44775.
MLA Handbook (7th Edition):
Chiu, Leung Kin. “Efficient audio signal processing for embedded systems.” 2012. Web. 17 Jan 2021.
Vancouver:
Chiu LK. Efficient audio signal processing for embedded systems. [Internet] [Doctoral dissertation]. Georgia Tech; 2012. [cited 2021 Jan 17].
Available from: http://hdl.handle.net/1853/44775.
Council of Science Editors:
Chiu LK. Efficient audio signal processing for embedded systems. [Doctoral Dissertation]. Georgia Tech; 2012. Available from: http://hdl.handle.net/1853/44775
26.
Dutton, Marcus.
Flexible architecture methods for graphics processing.
Degree: PhD, Electrical and Computer Engineering, 2011, Georgia Tech
URL: http://hdl.handle.net/1853/43658
► The FPGA GPU architecture proposed in this thesis was motivated by underserved markets for graphics processing that desire flexibility, long-term device availability, scalability, certifiability, and…
(more)
▼ The FPGA GPU architecture proposed in this thesis was motivated by underserved markets for graphics processing that desire flexibility, long-term device availability, scalability, certifiability, and high reliability. These markets of industrial,
medical, and avionics applications often are forced to rely on the latest GPUs that were
actually designed for gaming PCs or handheld consumer devices.
The architecture for the GPU in this thesis was crafted specifically for an FPGA and therefore takes advantage of its capabilities while also avoiding its limitations. Previous work did not specifically exploit the FPGA's structures and instead used FPGA implementations merely as an integration platform prior to proceeding on to a final ASIC design. The target of an FPGA for this architecture is also important because its
flexibility and programmability allow the GPU's performance to be scaled or supplemented to fit unique application requirements. This tailoring of the architecture to specific requirements minimizes power consumption and device cost while still satisfying performance, certification, and device availability requirements.
To demonstrate the feasibility of the flexible FPGA GPU architectural concepts, the architecture is applied to an avionics application and analyzed to confirm satisfactory results. The architecture is further validated through the development of extensions to support more comprehensive graphics processing applications. In addition, the breadth of this research is illustrated through its applicability to general-purpose computations and more specifically, scientific visualizations.
Advisors/Committee Members: Keezer, David (Committee Chair), Lanterman, Aaron (Committee Member), Richards, Mark (Committee Member), Sitaraman, Suresh (Committee Member), Swaminathan, Madhavan (Committee Member).
Subjects/Keywords: GPU; FPGA; Graphics processing units; Computer graphics; Field programmable gate arrays; Application-specific integrated circuits; Integrated circuits
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APA (6th Edition):
Dutton, M. (2011). Flexible architecture methods for graphics processing. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/43658
Chicago Manual of Style (16th Edition):
Dutton, Marcus. “Flexible architecture methods for graphics processing.” 2011. Doctoral Dissertation, Georgia Tech. Accessed January 17, 2021.
http://hdl.handle.net/1853/43658.
MLA Handbook (7th Edition):
Dutton, Marcus. “Flexible architecture methods for graphics processing.” 2011. Web. 17 Jan 2021.
Vancouver:
Dutton M. Flexible architecture methods for graphics processing. [Internet] [Doctoral dissertation]. Georgia Tech; 2011. [cited 2021 Jan 17].
Available from: http://hdl.handle.net/1853/43658.
Council of Science Editors:
Dutton M. Flexible architecture methods for graphics processing. [Doctoral Dissertation]. Georgia Tech; 2011. Available from: http://hdl.handle.net/1853/43658
27.
Bloch, Matthieu.
Physical-layer security.
Degree: PhD, Electrical and Computer Engineering, 2008, Georgia Tech
URL: http://hdl.handle.net/1853/24658
► As wireless networks continue to flourish worldwide and play an increasingly prominent role, it has become crucial to provide effective solutions to the inherent security…
(more)
▼ As wireless networks continue to flourish worldwide and play an increasingly prominent role, it has become crucial to provide effective solutions to the inherent security issues associated with a wireless transmission medium. Unlike traditional solutions, which usually handle security at the application layer, the primary concern of this thesis is to analyze and develop solutions based on coding techniques at the physical layer.
First, an information-theoretically secure communication protocol for quasi-static fading channels was developed and its performance with respect to theoretical limits was analyzed. A key element of the protocol is a reconciliation scheme for secret-key agreement based on low-density parity-check codes, which is specifically designed to operate on non-binary random variables and offers high reconciliation efficiency.
Second, the fundamental trade-offs between cooperation and security were analyzed by investigating the transmission of confidential messages to cooperative relays. This information-theoretic study highlighted the importance of jamming as a means to increase secrecy and confirmed the importance of carefully chosen relaying strategies.
Third, other applications of physical-layer security were investigated. Specifically, the use of secret-key agreement techniques for alternative cryptographic purposes was analyzed, and a framework for the design of practical information-theoretic commitment protocols over noisy channels was proposed.
Finally, the benefit of using physical-layer coding techniques beyond the physical layer was illustrated by studying security issues in client-server networks. A coding scheme exploiting packet losses at the network layer was proposed to ensure reliable communication between clients and servers and security against colluding attackers.
Advisors/Committee Members: McLaughlin, Steven (Committee Chair), Barros, Joao (Committee Member), Bellissard, Jean (Committee Member), Fekri, Faramarz (Committee Member), Lanterman, Aaron (Committee Member).
Subjects/Keywords: Wiretap channel; Information-theoretic security; Physical-layer security; Secret-key agreement; LDPC codes; Wireless communication systems; Computer networks Security measures
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APA (6th Edition):
Bloch, M. (2008). Physical-layer security. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/24658
Chicago Manual of Style (16th Edition):
Bloch, Matthieu. “Physical-layer security.” 2008. Doctoral Dissertation, Georgia Tech. Accessed January 17, 2021.
http://hdl.handle.net/1853/24658.
MLA Handbook (7th Edition):
Bloch, Matthieu. “Physical-layer security.” 2008. Web. 17 Jan 2021.
Vancouver:
Bloch M. Physical-layer security. [Internet] [Doctoral dissertation]. Georgia Tech; 2008. [cited 2021 Jan 17].
Available from: http://hdl.handle.net/1853/24658.
Council of Science Editors:
Bloch M. Physical-layer security. [Doctoral Dissertation]. Georgia Tech; 2008. Available from: http://hdl.handle.net/1853/24658
28.
McLaughlin, Adam.
Mapping parallel graph algorithms to throughput-oriented architectures.
Degree: PhD, Electrical and Computer Engineering, 2015, Georgia Tech
URL: http://hdl.handle.net/1853/54374
► The stagnant performance of single core processors, increasing size of data sets, and variety of structure in information has made the domain of parallel and…
(more)
▼ The stagnant performance of single core processors, increasing size of data sets, and variety of structure in information has made the domain of parallel and high-performance computing especially crucial. Graphics Processing Units (GPUs) have recently become an exciting alternative to traditional CPU architectures for applications in this domain. Although GPUs are designed for rendering graphics, research has found that the GPU architecture is well-suited to algorithms that search and analyze unstructured, graph-based data, offering up to an order of magnitude greater memory bandwidth over their CPU counterparts.
This thesis focuses on GPU graph analysis from the perspective that algorithms should be efficient on as many classes of graphs as possible, rather than being specialized to a specific class, such as social networks or road networks. Using betweenness centrality, a popular analytic used to find prominent entities of a network, as a motivating example, we show how parallelism, distributed computing, hybrid and on-line algorithms, and dynamic algorithms can all contribute to substantial improvements in the performance and energy-efficiency of these computations. We further generalize this approach and provide an abstraction that can be applied to a whole class of graph algorithms that require many simultaneous breadth-first searches. Finally, to show that our findings can be applied in real-world scenarios, we apply these techniques to the problem of verifying that a multiprocessor complies with its memory consistency model.
Advisors/Committee Members: Bader, David A. (advisor), Yalamanchili, Sudhakar (committee member), Lanterman, Aaron (committee member), Vuduc, Richard (committee member), Clements, Mark (committee member).
Subjects/Keywords: Parallel algorithms; GPUs; Graph algorithms; Memory consistency verification; Energy-efficiency; High performance computing
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APA (6th Edition):
McLaughlin, A. (2015). Mapping parallel graph algorithms to throughput-oriented architectures. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/54374
Chicago Manual of Style (16th Edition):
McLaughlin, Adam. “Mapping parallel graph algorithms to throughput-oriented architectures.” 2015. Doctoral Dissertation, Georgia Tech. Accessed January 17, 2021.
http://hdl.handle.net/1853/54374.
MLA Handbook (7th Edition):
McLaughlin, Adam. “Mapping parallel graph algorithms to throughput-oriented architectures.” 2015. Web. 17 Jan 2021.
Vancouver:
McLaughlin A. Mapping parallel graph algorithms to throughput-oriented architectures. [Internet] [Doctoral dissertation]. Georgia Tech; 2015. [cited 2021 Jan 17].
Available from: http://hdl.handle.net/1853/54374.
Council of Science Editors:
McLaughlin A. Mapping parallel graph algorithms to throughput-oriented architectures. [Doctoral Dissertation]. Georgia Tech; 2015. Available from: http://hdl.handle.net/1853/54374
29.
Dixon, Jason Herbert.
Pattern-theoretic automatic target recognition for infrared and laser radar data.
Degree: PhD, Electrical and Computer Engineering, 2015, Georgia Tech
URL: http://hdl.handle.net/1853/54404
► Pattern theory, a mathematical framework for representing knowledge of complex patterns developed by applied mathematician Ulf Grenander, has been shown to have potential uses in…
(more)
▼ Pattern theory, a mathematical framework for representing knowledge of complex patterns developed by applied mathematician Ulf Grenander, has been shown to have potential uses in automatic target recognition (ATR). Prior research performed in the mid-1990s at Washington University in St. Louis resulted in ATR algorithms based on concepts in pattern theory for forward-looking infrared (FLIR) and laser radar (LADAR) imagery, but additional work was needed to create algorithms that could be implemented in real ATR systems. This was due to performance barriers and a lack of calibration between target models and real data. This work addresses some of these issues by exploring techniques that can be used to create practical pattern-theoretic ATR algorithms. This dissertation starts by reviewing the previous pattern-theoretic ATR research described above and discussing new results involving the unification of two previously separate outcomes of that research: multi-target detection/recognition and thermal state estimation in FLIR imagery. To improve the overall utility of pattern-theoretic ATR, the following areas are re-examined: 1) generalized diffusion processes to update target pose estimates and 2) the calibration of thermal models with FLIR target data. The final section of this dissertation analyzes the fundamental accuracy limits of target pose estimation under different sensor conditions, independent of the target detection/recognition algorithm employed. The Cramér-Rao lower bound (CRLB) is used to determine these accuracy limits.
Advisors/Committee Members: Lanterman, Aaron (advisor), Yezzi, Anthony (committee member), AlRegib, Ghassan (committee member), Vela, Patricio (committee member), Vidakovic, Brani (committee member).
Subjects/Keywords: Automatic target recognition; Infrared; Laser radar; Pattern theory; Cramér-Rao bounds
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APA (6th Edition):
Dixon, J. H. (2015). Pattern-theoretic automatic target recognition for infrared and laser radar data. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/54404
Chicago Manual of Style (16th Edition):
Dixon, Jason Herbert. “Pattern-theoretic automatic target recognition for infrared and laser radar data.” 2015. Doctoral Dissertation, Georgia Tech. Accessed January 17, 2021.
http://hdl.handle.net/1853/54404.
MLA Handbook (7th Edition):
Dixon, Jason Herbert. “Pattern-theoretic automatic target recognition for infrared and laser radar data.” 2015. Web. 17 Jan 2021.
Vancouver:
Dixon JH. Pattern-theoretic automatic target recognition for infrared and laser radar data. [Internet] [Doctoral dissertation]. Georgia Tech; 2015. [cited 2021 Jan 17].
Available from: http://hdl.handle.net/1853/54404.
Council of Science Editors:
Dixon JH. Pattern-theoretic automatic target recognition for infrared and laser radar data. [Doctoral Dissertation]. Georgia Tech; 2015. Available from: http://hdl.handle.net/1853/54404
30.
Schlottmann, Craig Richard.
A coordinated approach to reconfigurable analog signal processing.
Degree: PhD, Electrical and Computer Engineering, 2012, Georgia Tech
URL: http://hdl.handle.net/1853/49021
► The purpose of this research is to create a solid framework for embedded system design with field-programmable analog arrays (FPAAs). To achieve this goal, we've…
(more)
▼ The purpose of this research is to create a solid framework for embedded system design with field-programmable analog arrays (FPAAs). To achieve this goal, we've created a unified approach to the three phases of FPAA system design: (1) the hardware architecture; (2) the circuit design and modeling; and (3) the high-level software tools. First, we describe innovations to the reconfigurable analog hardware that enable advanced signal processing and integration into embedded systems. We introduce the multiple-input translinear element (MITE) FPAA and the dynamically-reconfigurable RASP 2.9v FPAA, which was designed explicitly for interfacing with external digital systems. This compatibility creates a streamlined workflow for dropping the FPAA hardware into mixed-signal embedded systems. The second phase, algorithm analysis and modeling, is important to create a useful and reliable library of components for the system designer. We discuss the concept and procedure of analog abstraction that empowers non-circuit design engineers to take full advantage of analog techniques. We use the analog vector-matrix multiplier as an example for a detailed discussion on computational analog analysis and system mapping to the FPAA. Lastly, we describe high-level software tools, which are an absolute necessity for the design of large systems due to the size and complexity of modern FPAAs. We describe the Sim2Spice tool, which allows system designers to develop signal processing systems in the Simulink environment. The tool then compiles the system to the FPAA hardware. By coordinating the development of these three phases, we've created a solid unified framework that empowers engineers to utilize FPAAs.
Advisors/Committee Members: Hasler, Jennifer (advisor), Anderson, David (committee member), Lanterman, Aaron (committee member), McClellan, James (committee member), Smith, Mark (committee member).
Subjects/Keywords: System on chip; Field programmable analog array; Low-power design; Analog synthesis; Macromodeling; Mixed-mode processing; Signal processing
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APA (6th Edition):
Schlottmann, C. R. (2012). A coordinated approach to reconfigurable analog signal processing. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/49021
Chicago Manual of Style (16th Edition):
Schlottmann, Craig Richard. “A coordinated approach to reconfigurable analog signal processing.” 2012. Doctoral Dissertation, Georgia Tech. Accessed January 17, 2021.
http://hdl.handle.net/1853/49021.
MLA Handbook (7th Edition):
Schlottmann, Craig Richard. “A coordinated approach to reconfigurable analog signal processing.” 2012. Web. 17 Jan 2021.
Vancouver:
Schlottmann CR. A coordinated approach to reconfigurable analog signal processing. [Internet] [Doctoral dissertation]. Georgia Tech; 2012. [cited 2021 Jan 17].
Available from: http://hdl.handle.net/1853/49021.
Council of Science Editors:
Schlottmann CR. A coordinated approach to reconfigurable analog signal processing. [Doctoral Dissertation]. Georgia Tech; 2012. Available from: http://hdl.handle.net/1853/49021
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