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Texas A&M University
1.
Ruiz Vasquez, Roberto.
Study of the Effects of Obstacles in Liquefied Natural Gas (LNG) Vapor Dispersion using CFD Modeling.
Degree: MS, Safety Engineering, 2012, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11675
► The evaluation of the potential hazards related with the operation of an LNG terminal includes possible release scenarios with the consequent flammable vapor dispersion within…
(more)
▼ The evaluation of the potential hazards related with the operation of an LNG terminal includes possible release scenarios with the consequent flammable vapor dispersion within the facility; therefore, it is important to know the behavior of this phenomenon through the application of advanced simulation tools. Computational Fluid Dynamic (CFD) tools are often used to estimate the exclusion zones in an event of accidental LNG spill. In practice these releases are more likely to occur in the confines of complex geometries with solid obstacles such as LNG terminals, and LNG processing plants.
The objective of this research is to study the effects that different obstacles have over the LNG vapor dispersion and the safety distance reduction caused by enhanced mixing. Through parametric analysis it is demonstrated that height, width and shape of the obstacles play an important role in the vapor concentration reduction. The findings of this research may be applied in the design stage of an LNG terminal, to improve the design of passive barriers, and for designing better layout configurations for storage tanks. Simulations results performed with FLACS (Flame Acceleration Simulator), a CFD solver, confirmed that these applications help to reduce safety distances.
Advisors/Committee Members: Mannan, M. Sam (advisor), Glover, Charles J. (committee member), Malave, Cesar O. (committee member).
Subjects/Keywords: LNG; dispersion modeling; CFD; safety distance
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APA (6th Edition):
Ruiz Vasquez, R. (2012). Study of the Effects of Obstacles in Liquefied Natural Gas (LNG) Vapor Dispersion using CFD Modeling. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11675
Chicago Manual of Style (16th Edition):
Ruiz Vasquez, Roberto. “Study of the Effects of Obstacles in Liquefied Natural Gas (LNG) Vapor Dispersion using CFD Modeling.” 2012. Masters Thesis, Texas A&M University. Accessed March 04, 2021.
http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11675.
MLA Handbook (7th Edition):
Ruiz Vasquez, Roberto. “Study of the Effects of Obstacles in Liquefied Natural Gas (LNG) Vapor Dispersion using CFD Modeling.” 2012. Web. 04 Mar 2021.
Vancouver:
Ruiz Vasquez R. Study of the Effects of Obstacles in Liquefied Natural Gas (LNG) Vapor Dispersion using CFD Modeling. [Internet] [Masters thesis]. Texas A&M University; 2012. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11675.
Council of Science Editors:
Ruiz Vasquez R. Study of the Effects of Obstacles in Liquefied Natural Gas (LNG) Vapor Dispersion using CFD Modeling. [Masters Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11675

Texas A&M University
2.
Andujar-De Sanctis, Ivonne.
Unusual Intramolecular Kinetic Isotope Effects: Selectivity beyond Transition State Theory’s Jurisdiction.
Degree: PhD, Chemistry, 2014, Texas A&M University
URL: http://hdl.handle.net/1969.1/153893
► The nature of non-statistical dynamic Kinetic Isotope Effects for a series of ordinary organic reactions is studied throughout this dissertation. A combination of experimental intramolecular…
(more)
▼ The nature of non-statistical dynamic Kinetic Isotope Effects for a series of ordinary organic reactions is studied throughout this dissertation. A combination of experimental intramolecular KIEs using NMR methodology with computational calculations was employed in order to shed light about the selectivity in the Diels-Alder dimerization of methacrolein and cyclopentadienone, the iminium catalyzed Diels-Alder between cyclopentadiene and trans-cinnamaldehyde and the cleavage of alkoxy radicals.
Newtonian isotope effects as the underlying physical phenomena behind the KIEs in the thermal dimerization of methcrolein was studied. The temperature dependence of these novel form of KIEs was investigated by analyzing the isotopic distribution at dicyclopentadienone prepared at low and high temperatures. It was shown that Newtonian KIEs are temperature independent over a range of 100 degrees.
The non-statistical behavior in the cleavage of alkoxy radicals has been investigated. These highly reactive intermediates are prone to behave in a non-statistical fashion due to their excess energy. The opening of 1-methylcyclopentoxy radical has shown that heavy-atom tunneling can play an important role even at elevated temperatures. As the barrier for the cleavage for alkoxy radicals is decreased, other dynamic effects start to impact the selectivity of this reaction in ways that TST cannot account for.
On the iminium catalyzed Diels-Alder reaction between cyclopentadiene and transcinnamaldehyde, computational calculations support a two steps cycloaddition on the free energy surface and a “seemingly concerted” reaction in potential energy. The role of non-statistical recrossing for this cycloaddition was investigated experimentally by measuring intramolecular KIEs.
Advisors/Committee Members: Singleton, Daniel A (advisor), Gabbai, Francois (committee member), Wheeler, Steven E (committee member), Malave, Cesar O (committee member).
Subjects/Keywords: N/A
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APA (6th Edition):
Andujar-De Sanctis, I. (2014). Unusual Intramolecular Kinetic Isotope Effects: Selectivity beyond Transition State Theory’s Jurisdiction. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/153893
Chicago Manual of Style (16th Edition):
Andujar-De Sanctis, Ivonne. “Unusual Intramolecular Kinetic Isotope Effects: Selectivity beyond Transition State Theory’s Jurisdiction.” 2014. Doctoral Dissertation, Texas A&M University. Accessed March 04, 2021.
http://hdl.handle.net/1969.1/153893.
MLA Handbook (7th Edition):
Andujar-De Sanctis, Ivonne. “Unusual Intramolecular Kinetic Isotope Effects: Selectivity beyond Transition State Theory’s Jurisdiction.” 2014. Web. 04 Mar 2021.
Vancouver:
Andujar-De Sanctis I. Unusual Intramolecular Kinetic Isotope Effects: Selectivity beyond Transition State Theory’s Jurisdiction. [Internet] [Doctoral dissertation]. Texas A&M University; 2014. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/1969.1/153893.
Council of Science Editors:
Andujar-De Sanctis I. Unusual Intramolecular Kinetic Isotope Effects: Selectivity beyond Transition State Theory’s Jurisdiction. [Doctoral Dissertation]. Texas A&M University; 2014. Available from: http://hdl.handle.net/1969.1/153893
3.
Perez Roman, Eduardo.
Simulation and Optimization Models for Scheduling Multi-step Sequential Procedures in Nuclear Medicine.
Degree: PhD, Industrial Engineering, 2011, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-7958
► The rise in demand for specialized medical services in the U.S has been recognized as one of the contributors to increased health care costs. Nuclear…
(more)
▼ The rise in demand for specialized medical services in the U.S has been recognized
as one of the contributors to increased health care costs. Nuclear medicine is a specialized
service that uses relatively new technologies and radiopharmaceuticals with
a short half-life for diagnosis and treatment of patients. Nuclear medicine procedures
are multi-step and have to be performed under restrictive time constraints.
Consequently, managing patients in nuclear medicine clinics is a challenging problem
with little research attention. In this work we present simulation and optimization
models for improving patient and resource scheduling in health care specialty clinics
such as nuclear medicine departments. We rst derive a discrete event system
speci cation (DEVS) simulation model for nuclear medicine patient service management
that considers both patient and management perspectives. DEVS is a formal
modeling and simulation framework based on dynamical systems theory and provides
well de ned concepts for coupling components, hierarchical and modular model construction,
and an object-oriented substrate supporting repository reuse. Secondly, we
derive algorithms for scheduling nuclear medicine patients and resources and validate
our algorithms using the simulation model. We obtain computational results that
provide useful insights into patient service management in nuclear medicine. For example, the number of patients seen at the clinic during a year increases when a group
of stations are reserved to serve procedures with higher demand. Finally, we derive a
stochastic online scheduling (SOS) algorithm for patient and resource management in
nuclear medicine clinics. The algorithm performs scheduling decisions by taking into
account stochastic information about patient future arrivals. We compare the results
obtained using the SOS algorithm with the algorithms that do not take into consideration
stochastic information. The SOS algorithm provides a balanced utilization of
resources and a 10% improvement in the number of patients served.
Advisors/Committee Members: Ntaimo, Lewis (advisor), Malave, Cesar O. (advisor), Smith, Donald R. (committee member), Hsieh, Tony (committee member).
Subjects/Keywords: Simulation; Scheduling; Health care; Nuclear Medicine
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Chicago ·
MLA ·
Vancouver ·
CSE |
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APA (6th Edition):
Perez Roman, E. (2011). Simulation and Optimization Models for Scheduling Multi-step Sequential Procedures in Nuclear Medicine. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-7958
Chicago Manual of Style (16th Edition):
Perez Roman, Eduardo. “Simulation and Optimization Models for Scheduling Multi-step Sequential Procedures in Nuclear Medicine.” 2011. Doctoral Dissertation, Texas A&M University. Accessed March 04, 2021.
http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-7958.
MLA Handbook (7th Edition):
Perez Roman, Eduardo. “Simulation and Optimization Models for Scheduling Multi-step Sequential Procedures in Nuclear Medicine.” 2011. Web. 04 Mar 2021.
Vancouver:
Perez Roman E. Simulation and Optimization Models for Scheduling Multi-step Sequential Procedures in Nuclear Medicine. [Internet] [Doctoral dissertation]. Texas A&M University; 2011. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-7958.
Council of Science Editors:
Perez Roman E. Simulation and Optimization Models for Scheduling Multi-step Sequential Procedures in Nuclear Medicine. [Doctoral Dissertation]. Texas A&M University; 2011. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-7958
4.
Uriarte, Fabian Marcel.
A Partitioning Approach for Parallel Simulation of AC-Radial Shipboard Power Systems.
Degree: PhD, Electrical Engineering, 2011, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-7729
► An approach to parallelize the simulation of AC-Radial Shipboard Power Systems (SPSs) using multicore computers is presented. Time domain simulations of SPSs are notoriously slow,…
(more)
▼ An approach to parallelize the simulation of AC-Radial Shipboard Power Systems
(SPSs) using multicore computers is presented. Time domain simulations of SPSs are
notoriously slow, due principally to the number of components, and the time-variance of
the component models. A common approach to reduce the simulation run-time of power
systems is to formulate the electrical network equations using modified nodal analysis,
use Bergeron's travelling-wave transmission line model to create subsystems, and to
parallelize the simulation using a distributed computer. In this work, an SPS was
formulated using loop analysis, defining the subsystems using a diakoptics-based
approach, and the simulation parallelized using a multicore computer.
A program was developed in C# to conduct multithreaded parallel-sequential
simulations of an SPS. The program first represents an SPS as a graph, and then
partitions the graph. Each graph partition represents a SPS subsystem and is
computationally balanced using iterative refinement heuristics. Once balanced
subsystems are obtained, each SPS subsystem's electrical network equations are formulated using loop analysis. Each SPS subsystem is solved using a unique thread,
and each thread is manually assigned to a core of a multicore computer.
To validate the partitioning approach, performance metrics were created to assess
the speed gain and accuracy of the partitioned SPS simulations. The simulation
parameters swept for the performance metrics were the number of partitions, the number
of cores used, and the time step increment. The results of the performance metrics
showed adequate speed gains with negligible error.
An increasing simulation speed gain was observed when the number of partitions
and cores were augmented, obtaining maximum speed gains of <30x when using a quadcore
computer. Results show that the speed gain is more sensitive to the number
partitions than is to the number of cores. While multicore computers are suitable for
parallel-sequential SPS simulations, increasing the number of cores does not contribute
to the gain in speed as much as does partitioning.
The simulation error increased with the simulation time step but did not influence
the partitioned simulation results. The number of operations caused by protective
devices was used to determine whether the simulation error introduced by partitioning
SPS simulations produced a inconsistent system behavior. It is shown, for the time step
sizes uses, that protective devices did not operate inadvertently, which indicates that the
errors did not alter RMS measurement and, hence, were non-influential.
Advisors/Committee Members: Butler-Purry, Karen L. (advisor), Malave, Cesar O. (committee member), Singh, Chanan (committee member), Khatri, Sunil P. (committee member).
Subjects/Keywords: C#; diakoptics; EMTP; loop analysis; multicore; PC; partitioning; parallel; power systems; ship; shipboard power systems; Windows
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
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APA (6th Edition):
Uriarte, F. M. (2011). A Partitioning Approach for Parallel Simulation of AC-Radial Shipboard Power Systems. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-7729
Chicago Manual of Style (16th Edition):
Uriarte, Fabian Marcel. “A Partitioning Approach for Parallel Simulation of AC-Radial Shipboard Power Systems.” 2011. Doctoral Dissertation, Texas A&M University. Accessed March 04, 2021.
http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-7729.
MLA Handbook (7th Edition):
Uriarte, Fabian Marcel. “A Partitioning Approach for Parallel Simulation of AC-Radial Shipboard Power Systems.” 2011. Web. 04 Mar 2021.
Vancouver:
Uriarte FM. A Partitioning Approach for Parallel Simulation of AC-Radial Shipboard Power Systems. [Internet] [Doctoral dissertation]. Texas A&M University; 2011. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-7729.
Council of Science Editors:
Uriarte FM. A Partitioning Approach for Parallel Simulation of AC-Radial Shipboard Power Systems. [Doctoral Dissertation]. Texas A&M University; 2011. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-7729

Texas A&M University
5.
Zuniga, Gerald Alexander.
Layer of protection analysis applied to ammonia refrigeration systems.
Degree: MS, Chemical Engineering, 2009, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-3133
► Ammonia refrigeration systems are widely used in industry. Demand of these systems is expected to increase due to the advantages of ammonia as refrigerant and…
(more)
▼ Ammonia refrigeration systems are widely used in industry. Demand of these
systems is expected to increase due to the advantages of ammonia as refrigerant and
because ammonia is considered a green refrigerant. Therefore, it is important to evaluate
the risks in existing and future ammonia refrigeration systems to ensure their safety.
LOPA (Layer of Protection Analysis) is one of the best ways to estimate the risk.
It provides quantified risk results with less effort and time than other methods. LOPA
analyses one cause-consequence scenario per time. It requires failure data and PFD
(Probability of Failure on Demand) of the independent protection layers available to
prevent the scenario. Complete application of LOPA requires the estimation of the
severity of the consequences and the mitigated frequency of the initiating event for risk
calculations.
Especially in existing ammonia refrigeration systems, information to develop
LOPA is sometimes scarce and uncertain. In these cases, the analysis relies on expert
opinion to determine the values of the variables required for risk estimation. Fuzzy
Logic has demonstrated to be useful in this situation allowing the construction of expert
systems.
Based on fuzzy logic, the LOPA method was adapted to represent the knowledge
available in standards and good industry practices for ammonia refrigeration. Fuzzy
inference systems were developed for severity and risk calculation. Severity fuzzy inference system uses the number of life threatening injuries or deaths, number of
injuries and type of medical attention required to calculate the severity risk index.
Frequency of the mitigated scenario is calculated using generic data for the initiating
event frequency and PFD of the independent protection layers. Finally, the risk fuzzy
inference system uses the frequency and severity values obtained to determine the risk of
the scenario.
The methodology was applied to four scenarios. Risk indexes were calculated
and compared with the traditional approach and risk decisions were made.
In conclusion, the fuzzy logic LOPA method provides good approximations of
the risk for ammonia refrigeration systems. The technique can be useful for risk
assessment of existing ammonia refrigeration systems.
Advisors/Committee Members: Mannan, Sam M. (advisor), Hall, Kenneth R. (committee member), Malave, Cesar O. (committee member).
Subjects/Keywords: LOPA; RISK ASSESSMENT; AMMONIA; REFRIGERATION
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APA ·
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MLA ·
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CSE |
Export
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Manager
APA (6th Edition):
Zuniga, G. A. (2009). Layer of protection analysis applied to ammonia refrigeration systems. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-3133
Chicago Manual of Style (16th Edition):
Zuniga, Gerald Alexander. “Layer of protection analysis applied to ammonia refrigeration systems.” 2009. Masters Thesis, Texas A&M University. Accessed March 04, 2021.
http://hdl.handle.net/1969.1/ETD-TAMU-3133.
MLA Handbook (7th Edition):
Zuniga, Gerald Alexander. “Layer of protection analysis applied to ammonia refrigeration systems.” 2009. Web. 04 Mar 2021.
Vancouver:
Zuniga GA. Layer of protection analysis applied to ammonia refrigeration systems. [Internet] [Masters thesis]. Texas A&M University; 2009. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-3133.
Council of Science Editors:
Zuniga GA. Layer of protection analysis applied to ammonia refrigeration systems. [Masters Thesis]. Texas A&M University; 2009. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-3133

Texas A&M University
6.
Schomerus, Aaron Michael.
Effectiveness of various techniques in reducing noise generated in measuring torsional vibration.
Degree: MS, Mechanical Engineering, 2009, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-1574
► Torsional vibration can be characterized as the cyclic variation of shaft speed, which can cause various failures in rotating machines, such as: gear-tooth breakage, blade-off…
(more)
▼ Torsional vibration can be characterized as the cyclic variation of shaft speed, which can cause various failures in rotating machines, such as: gear-tooth breakage, blade-off due to blade fatigue in steam turbines, break-off of shafts, and overloading of components fitted onto the shaft. Commercially, there are only a few systems available that measure this type of vibration as compared to lateral vibration measurement systems. Most of these systems required modifications to the rotating machine, which in some cases are unacceptable. Therefore, it has become common practice to develop in-house torsional vibration measurement systems. A common measurement technique, called Time Interval Measurement (TIMS), calculates the instantaneous speed of the shaft from a frequency modulated carrier wave. Since torsional vibration is the cyclic variation of shaft speed, the shaft speed can be used to determine torsional vibration. Noise can be easily introduced into this type of system masking the torsional vibration; this was apparent in the measurement system developed by Kar, which was used as a baseline for the experiments conducted in this thesis. Various techniques were employed to reduce the effects of the noise in the measurement system, such as (1) created an algorithm, different than the one used by Kar, to calculate shaft speed, (2) increased the sampling rate of the data acquisition boards, (3) resampled the shaft speed into the order domain in order to remove harmonic noise, and (4) created an algorithm that corrects the shaft speed calculation to account for unequal spacing of encoder segments. These noise reducing techniques were compiled into a LabVIEW™ program in order to develop a robust measurement system. Each technique was tested individually on two test rigs constructed at the Turbomachinery Laboratory. Each technique proved to reduce the noise introduced into the system, but the geometric compensation algorithm proved to be the most effective in reducing the noise. This thesis proved that an in-house measurement system could be developed at a relatively low cost and with relative ease.
Advisors/Committee Members: Vance, John M. (advisor), Malave, Cesar O. (committee member), Palazzolo, Alan B. (committee member).
Subjects/Keywords: torsional vibration; TIMS
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Schomerus, A. M. (2009). Effectiveness of various techniques in reducing noise generated in measuring torsional vibration. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-1574
Chicago Manual of Style (16th Edition):
Schomerus, Aaron Michael. “Effectiveness of various techniques in reducing noise generated in measuring torsional vibration.” 2009. Masters Thesis, Texas A&M University. Accessed March 04, 2021.
http://hdl.handle.net/1969.1/ETD-TAMU-1574.
MLA Handbook (7th Edition):
Schomerus, Aaron Michael. “Effectiveness of various techniques in reducing noise generated in measuring torsional vibration.” 2009. Web. 04 Mar 2021.
Vancouver:
Schomerus AM. Effectiveness of various techniques in reducing noise generated in measuring torsional vibration. [Internet] [Masters thesis]. Texas A&M University; 2009. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1574.
Council of Science Editors:
Schomerus AM. Effectiveness of various techniques in reducing noise generated in measuring torsional vibration. [Masters Thesis]. Texas A&M University; 2009. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1574

Texas A&M University
7.
Chander, Karthik Balachandran.
Adaptive tool selection strategies for drilling in flexible manufacturing systems.
Degree: MS, Industrial Engineering, 2004, Texas A&M University
URL: http://hdl.handle.net/1969.1/566
► The thesis presents an approach to adaptive decision making strategies to reduce bottlenecks in a drilling operation and to extend tool life. It is an…
(more)
▼ The thesis presents an approach to adaptive decision making strategies to reduce bottlenecks in a drilling operation and to extend tool life. It is an attempt to portray the real drilling system in a typical Flexible Manufacturing System (FMS) layout. The system designed serves as back end intelligence to drilling machines (INTELLIDRILL) in a Flexible Manufacturing System for making dynamic and real time decisions. INTELLIDRILL uses mathematical and adaptive tool reliability models to simulate the machining conditions and tool availability for an operation based on history of tool failures. The results are used to compute the machining parameters and the tools required for an operation. INTELLIDRILL can devise strategies for different tool materials to operate on batches of different materials. INTELLIDRILL decisions could lead to significant savings in tooling costs and reduction in flow line bottlenecks.
Advisors/Committee Members: Banerjee, Amarnath (advisor), Malave, Cesar O. (committee member), Lawrence, Barry (committee member).
Subjects/Keywords: Adaptive Tool Selection; Flexible Manufacturing System; Drilling; Tool Life
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APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
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APA (6th Edition):
Chander, K. B. (2004). Adaptive tool selection strategies for drilling in flexible manufacturing systems. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/566
Chicago Manual of Style (16th Edition):
Chander, Karthik Balachandran. “Adaptive tool selection strategies for drilling in flexible manufacturing systems.” 2004. Masters Thesis, Texas A&M University. Accessed March 04, 2021.
http://hdl.handle.net/1969.1/566.
MLA Handbook (7th Edition):
Chander, Karthik Balachandran. “Adaptive tool selection strategies for drilling in flexible manufacturing systems.” 2004. Web. 04 Mar 2021.
Vancouver:
Chander KB. Adaptive tool selection strategies for drilling in flexible manufacturing systems. [Internet] [Masters thesis]. Texas A&M University; 2004. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/1969.1/566.
Council of Science Editors:
Chander KB. Adaptive tool selection strategies for drilling in flexible manufacturing systems. [Masters Thesis]. Texas A&M University; 2004. Available from: http://hdl.handle.net/1969.1/566

Texas A&M University
8.
Choi, Young Keun.
Tool path generation and 3D tolerance analysis for free-form surfaces.
Degree: PhD, Industrial Engineering, 2005, Texas A&M University
URL: http://hdl.handle.net/1969.1/2237
► This dissertation focuses on developing algorithms that generate tool paths for free-form surfaces based on accuracy of desired manufactured part. A manufacturing part is represented…
(more)
▼ This dissertation focuses on developing algorithms
that generate tool paths for free-form surfaces based on accuracy of desired manufactured part. A manufacturing part is represented by mathematical curves and surfaces. Using the mathematical representation of the manufacturing part, we generate reliable and near optimal tool paths as well as cutter location (CL) data file for postprocessing. This algorithm includes two components. First is the forward-step function which determines maximum distance called forward- step between two cutter contact (CC) points with
given tolerance. This function is independent of the surface type and is applicable to all continuous parametric surfaces that are twice differentiable. The second component is the side-step function which determines maximum distance called side-step between two adjacent tool paths with a given scallop height. This algorithm reduces manufacturing and computing time as well as the CC points while keeping the given tolerance and scallop height in the tool paths. Several parts, for which the CC points are generated using the proposed algorithm, are machined using a three axes milling machine. As part of the validation process, the tool
paths generated during machining are analyzed to compare the machined part and the desired part.
Advisors/Committee Members: Banerjee, Amarnath (advisor), Malave, Cesar O. (committee member), Keyser, John C. (committee member).
Subjects/Keywords: CAD/CAM; Tool path generation; NC machining; Tolerance anaysis
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Choi, Y. K. (2005). Tool path generation and 3D tolerance analysis for free-form surfaces. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/2237
Chicago Manual of Style (16th Edition):
Choi, Young Keun. “Tool path generation and 3D tolerance analysis for free-form surfaces.” 2005. Doctoral Dissertation, Texas A&M University. Accessed March 04, 2021.
http://hdl.handle.net/1969.1/2237.
MLA Handbook (7th Edition):
Choi, Young Keun. “Tool path generation and 3D tolerance analysis for free-form surfaces.” 2005. Web. 04 Mar 2021.
Vancouver:
Choi YK. Tool path generation and 3D tolerance analysis for free-form surfaces. [Internet] [Doctoral dissertation]. Texas A&M University; 2005. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/1969.1/2237.
Council of Science Editors:
Choi YK. Tool path generation and 3D tolerance analysis for free-form surfaces. [Doctoral Dissertation]. Texas A&M University; 2005. Available from: http://hdl.handle.net/1969.1/2237

Texas A&M University
9.
Breedlove, Anthony Wayne.
Experimental identification of structural force coefficients in a bump-type foil bearing.
Degree: MS, Mechanical Engineering, 2009, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-1936
► This thesis presents further experimentation and modeling for bump-type gas foil bearings used in oil-free turbomachinery. The effect of shaft temperature on the measured structural…
(more)
▼ This thesis presents further experimentation and modeling for bump-type gas foil
bearings used in oil-free turbomachinery. The effect of shaft temperature on the
measured structural force response of foil bearings is of importance for reliable high
temperature applications. During actual operation with shaft rotation, the bearing
structural parameters are coupled to the effects of a hydrodynamic gas film layer, thus
determining the overall bearing load performance.
A
38.17 mm inner diameter foil bearing, Generation II, is mounted on an affixed
non-rotating hollow shaft with an outer diameter of
38.125 mm. A cartridge heater
inserted into the shaft provides a controllable heat source. The clearance between the
shaft and the foil bearing increases with increasing shaft temperatures (up to 188°C). A
static load (ranging from 0 N to 133 N) is applied to the bearing housing, while
measuring the resulting bearing displacement, which represents the compliant structure
deflection. Static load versus displacement tests render the bearing static structural
stiffness. As the shaft temperature increases, the static test results indicate that the
bearing structural stiffness decreases by as much as 70% depending on the bearing
orientation. A dynamic load test setup includes a rigid shaft support structure and a
suspended electromagnetic shaker. Dynamic load (from 13 N to 31 N) test results show
that the test foil bearing stiffness increases by as much as 50% with amplitude of
dynamic load above a lightly loaded region, nearly doubles with frequency up to 200 Hz,
and decreases by a third as shaft temperature increases. A stick slip phenomenon increases the bearing stiffness at higher frequencies for all the amplitudes of dynamic
load tested. The test derived equivalent viscous damping is inversely proportional to
amplitude of dynamic load, excitation frequency, and shaft temperature. Further, the
estimated bearing dry friction coefficient decreases from 0.52 to 0.36 with amplitude of
dynamic load and stays nearly constant as shaft temperature increases.
Test results identify static and dynamic bearing parameters for increasing shaft
temperature. These experimental results provide a benchmark for predictions from
analytical models in current development and are essential to establish sound design
practices of the compliant bearing structure.
Advisors/Committee Members: San Andres, Luis A. (advisor), Malave, Cesar O. (committee member), Vance, John M. (committee member).
Subjects/Keywords: bump-type; gas foil bearing; high temperature testing; structural stiffness; equivalent viscous damping
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APA (6th Edition):
Breedlove, A. W. (2009). Experimental identification of structural force coefficients in a bump-type foil bearing. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-1936
Chicago Manual of Style (16th Edition):
Breedlove, Anthony Wayne. “Experimental identification of structural force coefficients in a bump-type foil bearing.” 2009. Masters Thesis, Texas A&M University. Accessed March 04, 2021.
http://hdl.handle.net/1969.1/ETD-TAMU-1936.
MLA Handbook (7th Edition):
Breedlove, Anthony Wayne. “Experimental identification of structural force coefficients in a bump-type foil bearing.” 2009. Web. 04 Mar 2021.
Vancouver:
Breedlove AW. Experimental identification of structural force coefficients in a bump-type foil bearing. [Internet] [Masters thesis]. Texas A&M University; 2009. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1936.
Council of Science Editors:
Breedlove AW. Experimental identification of structural force coefficients in a bump-type foil bearing. [Masters Thesis]. Texas A&M University; 2009. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1936

Texas A&M University
10.
Jones, Adam Matthew.
Experimental examination of wire mesh dampers subjected to large amplitude displacements.
Degree: MS, Mechanical Engineering, 2009, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-1939
► Wire mesh dampers are under investigation because they are seen as replacements for squeeze film dampers as a source of direct stiffness and damping at…
(more)
▼ Wire mesh dampers are under investigation because they are seen as replacements for squeeze film dampers as a source of direct stiffness and damping at bearing locations. There are several advantages of wire mesh dampers over squeeze film dampers, including: temperature insensitivity, oil-free operation, and the ability to contain large amplitude vibrations. Furthermore, due to their direct damping and lack of cross-coupled stiffness, the wire mesh reduces the response to imbalance and increases the stability of the system. The objective of this research was to determine the properties of wire mesh dampers under large amplitude vibrations. Impact testing was first conducted on the wire mesh as a means of obtaining the large amplitudes that were of interest. Next, to verify the results, a second methodology was employed using shaker testing. It was found that both the stiffness and hysteretic damping decrease with increasing displacement. However, they both approached asymptotes around 2 mils of displacement, and further increases in displacement had significantly less effect on the properties. Once the results were verified to be consistent, equations were obtained to describe the response of the wire mesh dampers. These equations were then used to create a new design workbook, which would allow an engineer to determine the properties of wire mesh dampers under conditions that they might experience.
Advisors/Committee Members: Vance, John M. (advisor), Malave, Cesar O. (committee member), Palazzolo, Alan B. (committee member).
Subjects/Keywords: wire; mesh; dampers; displacement
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Jones, A. M. (2009). Experimental examination of wire mesh dampers subjected to large amplitude displacements. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-1939
Chicago Manual of Style (16th Edition):
Jones, Adam Matthew. “Experimental examination of wire mesh dampers subjected to large amplitude displacements.” 2009. Masters Thesis, Texas A&M University. Accessed March 04, 2021.
http://hdl.handle.net/1969.1/ETD-TAMU-1939.
MLA Handbook (7th Edition):
Jones, Adam Matthew. “Experimental examination of wire mesh dampers subjected to large amplitude displacements.” 2009. Web. 04 Mar 2021.
Vancouver:
Jones AM. Experimental examination of wire mesh dampers subjected to large amplitude displacements. [Internet] [Masters thesis]. Texas A&M University; 2009. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1939.
Council of Science Editors:
Jones AM. Experimental examination of wire mesh dampers subjected to large amplitude displacements. [Masters Thesis]. Texas A&M University; 2009. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1939

Texas A&M University
11.
Valdes Garcia, Alberto.
System-level design and RF front-end implementation for a 3-10ghz multiband-ofdm ultrawideband receiver and built-in testing techniques for analog and rf integrated circuits.
Degree: PhD, Electrical Engineering, 2007, Texas A&M University
URL: http://hdl.handle.net/1969.1/5757
► This work consists of two main parts: a) Design of a 3-10GHz UltraWideBand (UWB) Receiver and b) Built-In Testing Techniques (BIT) for Analog and RF…
(more)
▼ This work consists of two main parts: a) Design of a 3-10GHz UltraWideBand
(UWB) Receiver and b) Built-In Testing Techniques (BIT) for Analog and RF circuits.
The MultiBand OFDM (MB-OFDM) proposal for UWB communications has
received significant attention for the implementation of very high data rate (up to
480Mb/s) wireless devices. A wideband LNA with a tunable notch filter, a downconversion
quadrature mixer, and the overall radio system-level design are proposed for
an 11-band 3.4-10.3GHz direct conversion receiver for MB-OFDM UWB implemented
in a 0.25mm BiCMOS process. The packaged IC includes an RF front-end with
interference rejection at 5.25GHz, a frequency synthesizer generating 11 carrier tones in
quadrature with fast hopping, and a linear phase baseband section with 42dB of gain
programmability. The receiver IC mounted on a FR-4 substrate provides a maximum
gain of 67-78dB and NF of 5-10dB across all bands while consuming 114mA from a
2.5V supply.
Two BIT techniques for analog and RF circuits are developed. The goal is to reduce
the test cost by reducing the use of analog instrumentation. An integrated frequency response characterization system with a digital interface is proposed to test the
magnitude and phase responses at different nodes of an analog circuit. A complete
prototype in CMOS 0.35mm technology employs only 0.3mm2 of area. Its operation is
demonstrated by performing frequency response measurements in a range of 1 to
130MHz on 2 analog filters integrated on the same chip. A very compact CMOS RF
RMS Detector and a methodology for its use in the built-in measurement of the gain and
1dB compression point of RF circuits are proposed to address the problem of on-chip
testing at RF frequencies. The proposed device generates a DC voltage proportional to
the RMS voltage amplitude of an RF signal. A design in CMOS 0.35mm technology
presents and input capacitance <15fF and occupies and area of 0.03mm2. The application
of these two techniques in combination with a loop-back test architecture significantly
enhances the testability of a wireless transceiver system.
Advisors/Committee Members: Sinencio, Sanchez, Edgar (advisor), Malave, Cesar O. (committee member), Miller, Scott L. (committee member), Martinez, Silva, Jose (committee member).
Subjects/Keywords: RF Integrated Circuits; Analog Integrated Circuits; Wireless Receiver; UWB; Built-In Testing
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Valdes Garcia, A. (2007). System-level design and RF front-end implementation for a 3-10ghz multiband-ofdm ultrawideband receiver and built-in testing techniques for analog and rf integrated circuits. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/5757
Chicago Manual of Style (16th Edition):
Valdes Garcia, Alberto. “System-level design and RF front-end implementation for a 3-10ghz multiband-ofdm ultrawideband receiver and built-in testing techniques for analog and rf integrated circuits.” 2007. Doctoral Dissertation, Texas A&M University. Accessed March 04, 2021.
http://hdl.handle.net/1969.1/5757.
MLA Handbook (7th Edition):
Valdes Garcia, Alberto. “System-level design and RF front-end implementation for a 3-10ghz multiband-ofdm ultrawideband receiver and built-in testing techniques for analog and rf integrated circuits.” 2007. Web. 04 Mar 2021.
Vancouver:
Valdes Garcia A. System-level design and RF front-end implementation for a 3-10ghz multiband-ofdm ultrawideband receiver and built-in testing techniques for analog and rf integrated circuits. [Internet] [Doctoral dissertation]. Texas A&M University; 2007. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/1969.1/5757.
Council of Science Editors:
Valdes Garcia A. System-level design and RF front-end implementation for a 3-10ghz multiband-ofdm ultrawideband receiver and built-in testing techniques for analog and rf integrated circuits. [Doctoral Dissertation]. Texas A&M University; 2007. Available from: http://hdl.handle.net/1969.1/5757

Texas A&M University
12.
Shim, Young Hak.
Design of a cluster analysis heuristic for the configuration and capacity management of manufacturing cells.
Degree: PhD, Industrial Engineering, 2007, Texas A&M University
URL: http://hdl.handle.net/1969.1/5905
► This dissertation presents the configuration and capacity management of manufacturing cells using cluster analysis. A heuristic based on cluster analysis is developed to solve cell…
(more)
▼ This dissertation presents the configuration and capacity management of manufacturing cells using cluster analysis. A heuristic based on cluster analysis is developed to solve cell formation in cellular manufacturing systems (CMS). The clustering heuristic is applied for cell formation considering processing requirement (CFOPR) as well as various manufacturing factors (CFVMF). The proposed clustering heuristic is developed by employing a new solving structure incorporating hierarchical and non-hierarchical clustering methods. A new similarity measure is constructed by modifying the Jarccard similarity and a new assignment algorithm is proposed by employing the new pairwise exchange method. In CFOPR, the clustering heuristic is modified by adding a feedback step and more exact allocation rules. Grouping efficacy is employed as a measure to evaluate solutions obtained from the heuristic. The clustering heuristic for CFOPR was evaluated on 23 test problems taken from the literature in order to compare with other approaches and produced the best solution in 18 out of 23 and the second best in the remaining problems. These solutions were obtained in a considerably short time and even the largest test problem was solved in around one and a half seconds. In CFVMF, the machine capacity was first ensured, and then manufacturing cells were configured to minimize intercellular movements. In order to ensure the machine capacity, the duplication of machines and the split of operations are allowed and operations are assigned into duplicated machines by the largest-first rule. The clustering heuristic for CFVMF proposes a new similarity measure incorporating processing requirement, material flow and machine workload and a new machine-part matrix representing material flow and processing time assigned to multiple identical machines. Also, setup time, which has not been clearly addressed in existing research, is discussed in the solving procedure. The clustering heuristic for CFVMF employs two evaluation measures such as the number of intercellular movements and grouping efficacy. In two test problems taken from the literature, the heuristic for CFVMF produced the same results, but the trade-off problem between the two evaluation measures is proposed to consider the goodness of grouping.
Advisors/Committee Members: Malave, Cesar O. (advisor), Banerjee, Amarnath P. (committee member), Hsieh, Sheng-Jen "Tony" (committee member), Ntaimo, Lewis (committee member).
Subjects/Keywords: Cluster analysis; Cell formation
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Shim, Y. H. (2007). Design of a cluster analysis heuristic for the configuration and capacity management of manufacturing cells. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/5905
Chicago Manual of Style (16th Edition):
Shim, Young Hak. “Design of a cluster analysis heuristic for the configuration and capacity management of manufacturing cells.” 2007. Doctoral Dissertation, Texas A&M University. Accessed March 04, 2021.
http://hdl.handle.net/1969.1/5905.
MLA Handbook (7th Edition):
Shim, Young Hak. “Design of a cluster analysis heuristic for the configuration and capacity management of manufacturing cells.” 2007. Web. 04 Mar 2021.
Vancouver:
Shim YH. Design of a cluster analysis heuristic for the configuration and capacity management of manufacturing cells. [Internet] [Doctoral dissertation]. Texas A&M University; 2007. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/1969.1/5905.
Council of Science Editors:
Shim YH. Design of a cluster analysis heuristic for the configuration and capacity management of manufacturing cells. [Doctoral Dissertation]. Texas A&M University; 2007. Available from: http://hdl.handle.net/1969.1/5905

Texas A&M University
13.
Mendez Pinero, Mayra I.
Decision Support System (DSS) for Machine Selection: A Cost Minimization Model.
Degree: PhD, Industrial Engineering, 2010, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-2009-05-645
► Within any manufacturing environment, the selection of the production or assembly machines is part of the day to day responsibilities of management. This is especially…
(more)
▼ Within any manufacturing environment, the selection of the production or assembly machines is part of the day to day responsibilities of management. This is especially true when there are multiple types of machines that can be used to perform each assembly or manufacturing process. As a result, it is critical to find the optimal way to select machines when there are multiple related assembly machines available. The objective of this research is to develop and present a model that can provide guidance to management when making machine selection decisions of parallel, non-identical, related electronics assembly machines. A model driven Decision Support System (DSS) is used to solve the problem with the emphasis in optimizing available resources, minimizing production disruption, thus minimizing cost. The variables that affect electronics product costs are considered in detail. The first part of the Decision Support System was developed using Microsoft Excel as an interactive tool. The second part was developed through mathematical modeling with AMPL9 mathematical programming language and the solver CPLEX90 as the optimization tools. The mathematical model minimizes total cost of all products using a similar logic as the shortest processing time (SPT) scheduling rule. This model balances machine workload up to an allowed imbalance factor. The model also considers the impact on the product cost when expediting production. Different scenarios were studied during the sensitivity analysis, including varying the amount of assembled products, the quantity of machines at each assembly process, the imbalance factor, and the coefficient of variation (CV) of the assembly processes. The results show that the higher the CV, the total cost of all products assembled increased due to the complexity of balancing machine workload for a large number of products. Also, when the number of machines increased, given a constant number of products, the total cost of all products assembled increased because it is more difficult to keep the machines balanced. Similar results were obtained when a tighter imbalance factor was used.
Advisors/Committee Members: Malave, Cesar O. (advisor), McGowan, Annie (committee member), Smith, Don R. (committee member), Strawser, Robert H. (committee member).
Subjects/Keywords: Cost model; Machine selection; Machine workload balance
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Mendez Pinero, M. I. (2010). Decision Support System (DSS) for Machine Selection: A Cost Minimization Model. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2009-05-645
Chicago Manual of Style (16th Edition):
Mendez Pinero, Mayra I. “Decision Support System (DSS) for Machine Selection: A Cost Minimization Model.” 2010. Doctoral Dissertation, Texas A&M University. Accessed March 04, 2021.
http://hdl.handle.net/1969.1/ETD-TAMU-2009-05-645.
MLA Handbook (7th Edition):
Mendez Pinero, Mayra I. “Decision Support System (DSS) for Machine Selection: A Cost Minimization Model.” 2010. Web. 04 Mar 2021.
Vancouver:
Mendez Pinero MI. Decision Support System (DSS) for Machine Selection: A Cost Minimization Model. [Internet] [Doctoral dissertation]. Texas A&M University; 2010. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2009-05-645.
Council of Science Editors:
Mendez Pinero MI. Decision Support System (DSS) for Machine Selection: A Cost Minimization Model. [Doctoral Dissertation]. Texas A&M University; 2010. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2009-05-645

Texas A&M University
14.
Mena Lopez, Hugo Eduardo.
Maximum power tracking control scheme for wind generator systems.
Degree: MS, Electrical Engineering, 2009, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-2063
► The purpose of this work is to develop a maximum power tracking control strategy for variable speed wind turbine systems. Modern wind turbine control systems…
(more)
▼ The purpose of this work is to develop a maximum power tracking control strategy for variable speed wind turbine systems. Modern wind turbine control systems are slow, and they depend on the design parameters of the turbine and use wind and/or rotor speed measurements as control variable inputs. The dependence on the accuracy of the measurement devices makes the controller less reliable. The proposed control scheme is based on the stiff system concept and provides a fast response and a dynamic solution to the complicated aerodynamic system. This control scheme provides a response to the wind changes without the knowledge of wind speed and turbine parameters. The system consists of a permanent magnet synchronous machine (PMSM), a passive rectifier, a dc/dc boost converter, a current controlled voltage source inverter, and a microcontroller that commands the dc/dc converter to control the generator for maximum power extraction. The microcontroller will also be able to control the current output of the three-phase inverter. In this work, the aerodynamic characteristics of wind turbines and the power conversion system topology are explained. The maximum power tracking control algorithm with a variable step estimator is introduced and the modeling and simulation of the wind turbine generator system using the MATLAB/SIMULINK® software is presented and its results show, at least in principle, that the maximum power tracking algorithm developed is suitable for wind turbine generation systems.
Advisors/Committee Members: Ehsani, Mehrdad (advisor), Bhattacharyya, Shankar (committee member), Butler-Purry, Karen (committee member), Malave, Cesar O. (committee member).
Subjects/Keywords: Wind Power; Wind energy; Maximun power controller
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Mena Lopez, H. E. (2009). Maximum power tracking control scheme for wind generator systems. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2063
Chicago Manual of Style (16th Edition):
Mena Lopez, Hugo Eduardo. “Maximum power tracking control scheme for wind generator systems.” 2009. Masters Thesis, Texas A&M University. Accessed March 04, 2021.
http://hdl.handle.net/1969.1/ETD-TAMU-2063.
MLA Handbook (7th Edition):
Mena Lopez, Hugo Eduardo. “Maximum power tracking control scheme for wind generator systems.” 2009. Web. 04 Mar 2021.
Vancouver:
Mena Lopez HE. Maximum power tracking control scheme for wind generator systems. [Internet] [Masters thesis]. Texas A&M University; 2009. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2063.
Council of Science Editors:
Mena Lopez HE. Maximum power tracking control scheme for wind generator systems. [Masters Thesis]. Texas A&M University; 2009. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2063

Texas A&M University
15.
Fan, Xiaohua.
High performance building blocks for wireless receiver: multi-stage amplifiers and low noise amplifiers.
Degree: PhD, Electrical Engineering, 2009, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-2497
► Different wireless communication systems utilizing different standards and for multiple applications have penetrated the normal people's life, such as Cell phone, Wireless LAN, Bluetooth, Ultra…
(more)
▼ Different wireless communication systems utilizing different standards and for multiple
applications have penetrated the normal people's life, such as Cell phone, Wireless LAN,
Bluetooth, Ultra wideband (UWB) and WiMAX systems. The wireless receiver normally
serves as the primary part of the system, which heavily influences the system performance.
This research concentrates on the designs of several important blocks of the receiver;
multi-stage amplifier and low noise amplifier.
Two novel multi-stage amplifier typologies are proposed to improve the bandwidth and
reduce the silicon area for the application where a large capacitive load exists. They were
designed using AMI 0.5
m µ CMOS technology. The simulation and measurement results
show they have the best Figure-of-Merits (FOMs) in terms of small signal and large signal
performances, with 4.6MHz and 9MHz bandwidth while consuming 0.38mW and 0.4mW
power from a 2V power supply. Two Low Noise Amplifiers (LNAs) are proposed, with one designed for narrowband
application and the other for UWB application. A noise reduction technique is proposed for
the differential cascode Common Source LNA (CS-LNA), which reduces the LNA Noise
Figure (NF), increases the LNA gain, and improves the LNA linearity. At the same time, a
novel Common Gate LNA (CG-LNA) is proposed for UWB application, which has better
linearity, lower power consumption, and reasonable noise performance.
Finally a novel practical current injection built-in-test (BIT) technique is proposed for the
RF Front-end circuits. If the off-chip component Lg and Rs values are well controlled, the
proposed technique can estimate the voltage gain of the LNA with less than 1dB (8%) error.
Advisors/Committee Members: Sanchez-Sinencio, Edgar (advisor), Malave, Cesar O. (committee member), Shi, Weiping (committee member), Silva-Martinez, Jose (committee member).
Subjects/Keywords: Multi-stage amplifier; Low noise amplifier; LNA; UWB; BIT
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Fan, X. (2009). High performance building blocks for wireless receiver: multi-stage amplifiers and low noise amplifiers. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2497
Chicago Manual of Style (16th Edition):
Fan, Xiaohua. “High performance building blocks for wireless receiver: multi-stage amplifiers and low noise amplifiers.” 2009. Doctoral Dissertation, Texas A&M University. Accessed March 04, 2021.
http://hdl.handle.net/1969.1/ETD-TAMU-2497.
MLA Handbook (7th Edition):
Fan, Xiaohua. “High performance building blocks for wireless receiver: multi-stage amplifiers and low noise amplifiers.” 2009. Web. 04 Mar 2021.
Vancouver:
Fan X. High performance building blocks for wireless receiver: multi-stage amplifiers and low noise amplifiers. [Internet] [Doctoral dissertation]. Texas A&M University; 2009. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2497.
Council of Science Editors:
Fan X. High performance building blocks for wireless receiver: multi-stage amplifiers and low noise amplifiers. [Doctoral Dissertation]. Texas A&M University; 2009. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2497

Texas A&M University
16.
Mays, Patricia Faye.
Seal strength models for medical device trays.
Degree: PhD, Industrial Engineering, 2009, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-2756
► Seven empirical equations were developed for the prediction of seal strength for medical device trays. A new methodology was developed and used for identifying burst…
(more)
▼ Seven empirical equations were developed for the prediction of seal strength for medical device
trays. A new methodology was developed and used for identifying burst and peel locations and comparing
burst pressure and peel force. Multiple linear regression was used to fit 76 models, selecting the best
models based on the Akaike Information Criterion (AIC) and adjusted R2 (R2
adj) value of each model. The
selected models have R2
adj and prediction R2
(R2
pred) values of .83 to .94.
Factors investigated for the peel force response were sealing pressure (3 levels), dwell time (3
levels), sealing temperature (3 levels), and adhesive. Additional factors investigated for the burst pressure
response were restraining plate gap, and tray volume, height, length-to-width ratio and area. Polyethylene
terephthalate-glycol (PETG) trays with Tyvek 1073B lids and two popular water-based adhesives were
used. Trays were selected to yield three levels of area and three levels of length-to-width ratio, defining
nine package configurations. Packages for burst testing were sealed under a fractional factorial design with
27 treatments. Packages for peel testing were sealed under a 17-point face-centered central composite
design. Packages were tested using peel testing following the ASTM F88-07 standard and restrained burst
testing with three gap distances following the ASTM F2054-00 standard.
All possible subsets of the factors were evaluated, with the best models selected based on AIC
value. Equations were developed to predict peak and average peel force based on sealing process
parameters (R2
pred =.94 and .92), burst pressure based on tray and sealing parameters and gap (R2
pred =.94),
and four peel force responses based on burst pressure and gap (R2
pred =.83 to .86). Models were validated
through cross-validation, using the prediction error sum of squares (PRESS) statistic. The R2
pred was
calculated to estimate the predictive ability of each model.
Advisors/Committee Members: Malave, Cesar O. (advisor), Feldman, Richard M. (committee member), Smith, Donald R. (committee member), Watson, Karan L. (committee member).
Subjects/Keywords: medical device; trays; burst; peel; testing; package; seal strength; sealing; burst test; peel test; models
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Mays, P. F. (2009). Seal strength models for medical device trays. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2756
Chicago Manual of Style (16th Edition):
Mays, Patricia Faye. “Seal strength models for medical device trays.” 2009. Doctoral Dissertation, Texas A&M University. Accessed March 04, 2021.
http://hdl.handle.net/1969.1/ETD-TAMU-2756.
MLA Handbook (7th Edition):
Mays, Patricia Faye. “Seal strength models for medical device trays.” 2009. Web. 04 Mar 2021.
Vancouver:
Mays PF. Seal strength models for medical device trays. [Internet] [Doctoral dissertation]. Texas A&M University; 2009. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2756.
Council of Science Editors:
Mays PF. Seal strength models for medical device trays. [Doctoral Dissertation]. Texas A&M University; 2009. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2756

Texas A&M University
17.
Kulkarni, Mandar Shashikant.
Implementation of a 1GHZ frontend using transform domain charge sampling techniques.
Degree: MS, Electrical Engineering, 2009, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-3158
► The recent popularity and convenience of Wireless communication and the need for integration demands the development of Software Defined Radio (SDR). First defined by Mitoal,…
(more)
▼ The recent popularity and convenience of Wireless communication and the need for integration demands the development of Software Defined Radio (SDR). First defined by Mitoal, the SDR processed the entire bandwidth using a high resolution and high speed ADC and remaining operations were done in DSP. The current trend in SDRs is to design highly reconfigurable analog front ends which can handle narrow-band and wideband standards, one at a time. Charge sampling has been widely used
in these architectures due to the built in antialiasing capabilities, jitter robustness at high signal frequencies and flexibility in filter design. This work proposed a 1GHz wideband front end aimed at SDR applications using Transform Domain (TD) sampling techniques. Frequency Domain (FD) sampling, a special case of TD sampling, efficiently parallelizes the signal for digital processing, relaxing the sampling requirements and enabling parallel digital processing at a much
lower rate and is a potential candidate for SDR. The proposed front end converts the RF signal into current and then it is downconverted using passive mixers. The front end has five parallel paths, each acting on a part of the spectrum effectively parallelizing the front end and relaxing the requirements. An overlap introduced between successive integration windows for jitter robustness was exploited to create
a novel sinc2 downsample by two filter topology. This topology was compared to a conventional topology and found to be equivalent and area efficient by about 44%. The proposed topology was used as a baseband filter for all paths in the front end. The chip was sent for fabrication in 45nm technology. The active area of the chip was 6:6mm2. The testing and measurement of the chip still remains to be done.
Advisors/Committee Members: Hoyos, Sebastian (advisor), Karsilayan, Aydin I. (committee member), Malave, Cesar O. (committee member), Pfister, Henry (committee member).
Subjects/Keywords: Software Defined Radio (SDR); Charge sampling; downsampling; sinc; FIR; IIR; antialiasing
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MLA ·
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to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Kulkarni, M. S. (2009). Implementation of a 1GHZ frontend using transform domain charge sampling techniques. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-3158
Chicago Manual of Style (16th Edition):
Kulkarni, Mandar Shashikant. “Implementation of a 1GHZ frontend using transform domain charge sampling techniques.” 2009. Masters Thesis, Texas A&M University. Accessed March 04, 2021.
http://hdl.handle.net/1969.1/ETD-TAMU-3158.
MLA Handbook (7th Edition):
Kulkarni, Mandar Shashikant. “Implementation of a 1GHZ frontend using transform domain charge sampling techniques.” 2009. Web. 04 Mar 2021.
Vancouver:
Kulkarni MS. Implementation of a 1GHZ frontend using transform domain charge sampling techniques. [Internet] [Masters thesis]. Texas A&M University; 2009. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-3158.
Council of Science Editors:
Kulkarni MS. Implementation of a 1GHZ frontend using transform domain charge sampling techniques. [Masters Thesis]. Texas A&M University; 2009. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-3158

Texas A&M University
18.
Scott, Wesley Dane.
A flexible control system for flexible manufacturing systems.
Degree: PhD, Industrial Engineering, 2004, Texas A&M University
URL: http://hdl.handle.net/1969.1/158
► A flexible workcell controller has been developed using a three level control hierarchy (workcell, workstation, equipment). The cell controller is automatically generated from a model…
(more)
▼ A flexible workcell controller has been developed using a three level control hierarchy (workcell, workstation, equipment). The cell controller is automatically generated from a model input by the user. The model consists of three sets of graphs. One set of graphs describes the process plans of the parts produced by the manufacturing system, one set describes movements into, out of and within workstations, and the third set describes movements of parts/transporters between workstations. The controller uses an event driven Petri net to maintain state information and to communicate with lower level controllers. The control logic is contained in an artificial neural network. The Petri net state information is used as the input to the neural net and messages that are Petri net events are output from the neural net. A genetic algorithm was used to search over alternative operation choices to find a "good" solution. The system was fully implemented and several test cases are described.
Advisors/Committee Members: Smith, Jeffrey S. (advisor), Malave, Cesar O. (advisor), Maxwell, Donald A. (committee member), Hsieh, Sheng-Jen (Tony) (committee member).
Subjects/Keywords: Petri nets; neural networks; genetic algorithm; flexible manufacturing systems; FMS; hierarchical control
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Scott, W. D. (2004). A flexible control system for flexible manufacturing systems. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/158
Chicago Manual of Style (16th Edition):
Scott, Wesley Dane. “A flexible control system for flexible manufacturing systems.” 2004. Doctoral Dissertation, Texas A&M University. Accessed March 04, 2021.
http://hdl.handle.net/1969.1/158.
MLA Handbook (7th Edition):
Scott, Wesley Dane. “A flexible control system for flexible manufacturing systems.” 2004. Web. 04 Mar 2021.
Vancouver:
Scott WD. A flexible control system for flexible manufacturing systems. [Internet] [Doctoral dissertation]. Texas A&M University; 2004. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/1969.1/158.
Council of Science Editors:
Scott WD. A flexible control system for flexible manufacturing systems. [Doctoral Dissertation]. Texas A&M University; 2004. Available from: http://hdl.handle.net/1969.1/158

Texas A&M University
19.
Lee, Jong Hwan.
A hierarchical heuristic approach for machine loading problems in a partially grouped environment.
Degree: PhD, Industrial Engineering, 2004, Texas A&M University
URL: http://hdl.handle.net/1969.1/229
► The loading problem in a Flexible Manufacturing System (FMS) lies in the allocation of operations and associated cutting tools to machines for a given set…
(more)
▼ The loading problem in a Flexible Manufacturing System (FMS) lies in the allocation of operations and associated cutting tools to machines for a given set of parts subject to capacity constraints. This dissertation proposes a hierarchical approach to the machine loading problem when the workload and tool magazine capacity of each machine are restrained. This hierarchical approach reduces the maximum workload of the machines by partially grouping them. This research deals with situations where different groups of machines performing the same operation require different processing times and this problem is formulated as an integer linear problem. This work proposes a solution that is comprised of two phases. In the first phase (Phase I), demand is divided into batches and then operations are allocated to groups of machines by using a heuristic constrained by the workload and tool magazine capacity of each group. The processing time of the operation is different for each machine group, which is composed of the same identical machines; however, these machines can perform different sets of operations if tooled differently. Each machine and each group of machines has a limited time for completing an operation. Operations are allocated to groups based on their respective workload limits. In the second phase (Phase II), demand is divided into batches again and operations are assigned to machines based on their workload and tool magazine capacity defined by Longest Processing Time (LPT) and Multifit algorithms. In Phase II, like Phase I, partial grouping is more effective in balancing the workload than total grouping. In partial grouping, each machine is tooled differently, but they can assist one another in processing each individual operation. Phase I demonstrates the efficiency of allocating operations to each group. Phase II demonstrates the efficiency of allocating operations to each machine within each group. This two-phase solution enhances routing flexibility with the same or a smaller number of machines through partial grouping rather than through total grouping. This partial grouping provides a balanced solution for problems involving a large number of machines. Performance of the suggested loading heuristics is tested by means of randomly generated tests.
Advisors/Committee Members: Malave, Cesar O. (advisor), Banerjee, Amarnath (committee member), Ding, Yu (committee member), Hsieh, Sheng-Jen (Tony) (committee member).
Subjects/Keywords: Flexible Manufacturing Systems; Loading problem; Partial grouping
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Lee, J. H. (2004). A hierarchical heuristic approach for machine loading problems in a partially grouped environment. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/229
Chicago Manual of Style (16th Edition):
Lee, Jong Hwan. “A hierarchical heuristic approach for machine loading problems in a partially grouped environment.” 2004. Doctoral Dissertation, Texas A&M University. Accessed March 04, 2021.
http://hdl.handle.net/1969.1/229.
MLA Handbook (7th Edition):
Lee, Jong Hwan. “A hierarchical heuristic approach for machine loading problems in a partially grouped environment.” 2004. Web. 04 Mar 2021.
Vancouver:
Lee JH. A hierarchical heuristic approach for machine loading problems in a partially grouped environment. [Internet] [Doctoral dissertation]. Texas A&M University; 2004. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/1969.1/229.
Council of Science Editors:
Lee JH. A hierarchical heuristic approach for machine loading problems in a partially grouped environment. [Doctoral Dissertation]. Texas A&M University; 2004. Available from: http://hdl.handle.net/1969.1/229

Texas A&M University
20.
Yoo, Jaewook.
Multi-period optimization of pavement management systems.
Degree: PhD, Industrial Engineering, 2004, Texas A&M University
URL: http://hdl.handle.net/1969.1/343
► The purpose of this research is to develop a model and solution methodology for selecting and scheduling timely and cost-effective maintenance, rehabilitation, and reconstruction activities…
(more)
▼ The purpose of this research is to develop a model and solution methodology for selecting and scheduling timely and cost-effective maintenance, rehabilitation, and reconstruction activities (
M & R) for each pavement section in a highway network and allocating the funding levels through a finite multi-period horizon within the constraints imposed by budget availability in each period, frequency availability of activities, and specified minimum pavement quality requirements.
M & R is defined as a chronological sequence of reconstruction, rehabilitation, and major/minor maintenance, including a "do nothing" activity. A procedure is developed for selecting an
M & R activity for each pavement section in each period of a specified extended planning horizon. Each activity in the sequence consumes a known amount of capital and generates a known amount of effectiveness measured in pavement quality. The effectiveness of an activity is the expected value of the overall gains in pavement quality rating due to the activity performed on a highway network over an analysis period. It is assumed that the unused portion of the budget for one period can be carried over to subsequent periods. Dynamic Programming (DP) and Branch-and-Bound (B-and-B) approaches are combined to produce a hybrid algorithm for solving the problem under consideratioin. The algorithm is essentially a DP approach in the sense that the problem is divided into smaller subproblems corresponding to each single period problem. However, the idea of fathoming partial solutions that could not lead to an optimal solution is incorporated within the algorithm to reduce storage and computational requirements in the DP frame using the B-and-B approach. The imbedded-state approach is used to reduce a multi-dimensional DP to a one-dimensional DP. For bounding at each stage, the problem is relaxed in a Lagrangean fashion so that it separates into longest-path network model subproblems. The values of the Lagrangean multipliers are found by a subgradient optimization method, while the Ford-Bellman network algorithm is employed at each iteration of the subgradient optimization procedure to solve the longest-path network problem as well as to obtain an improved lower and upper bound. If the gap between lower and upper bound is sufficiently small, then we may choose to accept the best known solutions as being sufficiently close to optimal and terminate the algorithm rather than continue to the final stage.
Advisors/Committee Members: Garcia-Diaz, Alberto (advisor), Malave, Cesar O. (committee member), Kim, Moo-Hyun (committee member), Banerjee, Amarnath (committee member).
Subjects/Keywords: multi-dimensional 0-1 knapsack problem with alternative selection and precedence-feasibility constraints; dynamic programming; branch-and-bound; Lagrangean relaxation; subgradient optimization
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Yoo, J. (2004). Multi-period optimization of pavement management systems. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/343
Chicago Manual of Style (16th Edition):
Yoo, Jaewook. “Multi-period optimization of pavement management systems.” 2004. Doctoral Dissertation, Texas A&M University. Accessed March 04, 2021.
http://hdl.handle.net/1969.1/343.
MLA Handbook (7th Edition):
Yoo, Jaewook. “Multi-period optimization of pavement management systems.” 2004. Web. 04 Mar 2021.
Vancouver:
Yoo J. Multi-period optimization of pavement management systems. [Internet] [Doctoral dissertation]. Texas A&M University; 2004. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/1969.1/343.
Council of Science Editors:
Yoo J. Multi-period optimization of pavement management systems. [Doctoral Dissertation]. Texas A&M University; 2004. Available from: http://hdl.handle.net/1969.1/343

Texas A&M University
21.
Melouk, Sharif.
Transportation system modeling using the High Level Architecture.
Degree: PhD, Industrial Engineering, 2004, Texas A&M University
URL: http://hdl.handle.net/1969.1/440
► This dissertation investigates the High Level Architecture (HLA) as a possible distributed simulation framework for transportation systems. The HLA is an object-oriented approach to distributed…
(more)
▼ This dissertation investigates the High Level Architecture (HLA) as a possible distributed simulation framework for transportation systems. The HLA is an object-oriented approach to distributed simulations developed by the Department of Defense (DoD) to handle the issues of reuse and interoperability of simulations. The research objectives are as follows: (1) determine the feasibility of making existing traffic management simulation environments HLA compliant; (2) evaluate the usability of existing HLA support software in the transportation arena; (3) determine the usability of methods developed by the military to test for HLA compliance on traffic simulation models; and (4) examine the possibility of using the HLA to create Internet-based virtual environments for transportation research. These objectives were achieved in part via the development of a distributed simulation environment using the HLA. Two independent traffic simulation models (federates) comprised the environment (federation). A CORSIM federate models a freeway feeder road with an on-ramp while an Arena federate models a tollbooth exchange.
Advisors/Committee Members: Shannon, Robert E. (advisor), Malave, Cesar O. (committee member), Davis, Robert A. (committee member), Smith, Don R. (committee member).
Subjects/Keywords: High Level Architecture; Distributed Simulation
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Melouk, S. (2004). Transportation system modeling using the High Level Architecture. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/440
Chicago Manual of Style (16th Edition):
Melouk, Sharif. “Transportation system modeling using the High Level Architecture.” 2004. Doctoral Dissertation, Texas A&M University. Accessed March 04, 2021.
http://hdl.handle.net/1969.1/440.
MLA Handbook (7th Edition):
Melouk, Sharif. “Transportation system modeling using the High Level Architecture.” 2004. Web. 04 Mar 2021.
Vancouver:
Melouk S. Transportation system modeling using the High Level Architecture. [Internet] [Doctoral dissertation]. Texas A&M University; 2004. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/1969.1/440.
Council of Science Editors:
Melouk S. Transportation system modeling using the High Level Architecture. [Doctoral Dissertation]. Texas A&M University; 2004. Available from: http://hdl.handle.net/1969.1/440

Texas A&M University
22.
Chae, Junjae.
Concurrent design of facility layout and flow-based department formation.
Degree: PhD, Industrial Engineering, 2005, Texas A&M University
URL: http://hdl.handle.net/1969.1/1606
► The design of facility layout takes into account a number of issues including the formation of departments, the layout of these, the determination of the…
(more)
▼ The design of facility layout takes into account a number of issues including the formation of departments, the layout of these, the determination of the material handling methods to be used, etc. To achieve an efficient layout, these issues should be examined simultaneously. However, in practice, these problems are generally formulated and solved sequentially due to the complicated nature of the integrated problem. Specifically, there is close interaction between the formation of departments and layout of these departments. These problems are treated as separate problems that are solved sequentially. This procedure is mainly due to the complexity of each problem and the interrelationships between them. In this research, we take a first step toward integrating the flow-based department formation and departmental layout into comprehensive mathematical models and develop appropriate solution procedures. It is expected that these mathematical models and the solution procedures developed will generate more efficient manufacturing system designs, insights into the nature of the concurrent facility layout problem, and new research directions.
Advisors/Committee Members: Peters, Brett A. (advisor), Malave, Cesar O. (committee member), Curry, Guy L. (committee member), Dahm, P. Frederick (committee member).
Subjects/Keywords: Facility Layout; Department Formation; Material Handling; Multi-bay Facility; Genetic Algorithms; Memetic Algorithms
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Chae, J. (2005). Concurrent design of facility layout and flow-based department formation. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/1606
Chicago Manual of Style (16th Edition):
Chae, Junjae. “Concurrent design of facility layout and flow-based department formation.” 2005. Doctoral Dissertation, Texas A&M University. Accessed March 04, 2021.
http://hdl.handle.net/1969.1/1606.
MLA Handbook (7th Edition):
Chae, Junjae. “Concurrent design of facility layout and flow-based department formation.” 2005. Web. 04 Mar 2021.
Vancouver:
Chae J. Concurrent design of facility layout and flow-based department formation. [Internet] [Doctoral dissertation]. Texas A&M University; 2005. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/1969.1/1606.
Council of Science Editors:
Chae J. Concurrent design of facility layout and flow-based department formation. [Doctoral Dissertation]. Texas A&M University; 2005. Available from: http://hdl.handle.net/1969.1/1606

Texas A&M University
23.
Jittamai, Phongchai.
Analysis of oil-pipeline distribution of multiple products subject to delivery time-windows.
Degree: PhD, Industrial Engineering, 2006, Texas A&M University
URL: http://hdl.handle.net/1969.1/3112
► This dissertation defines the operational problems of, and develops solution methodologies for, a distribution of multiple products into oil pipeline subject to delivery time-windows constraints.…
(more)
▼ This dissertation defines the operational problems of, and develops solution methodologies for, a distribution of multiple products into oil pipeline subject to delivery time-windows constraints. A multiple-product oil pipeline is a pipeline system composing of pipes, pumps, valves and storage facilities used to transport different types of liquids. Typically, products delivered by pipelines are petroleum of different grades moving either from production facilities to refineries or from refineries to distributors. Time-windows, which are generally used in logistics and scheduling areas, are incorporated in this study.
The distribution of multiple products into oil pipeline subject to delivery time-windows is modeled as multicommodity network flow structure and mathematically formulated. The main focus of this dissertation is the investigation of operating issues and problem complexity of single-source pipeline problems and also providing solution methodology to compute input schedule that yields minimum total time violation from due delivery time-windows. The problem is proved to be NP-complete. The heuristic approach, a reversed-flow algorithm, is developed based on pipeline flow reversibility to compute input schedule for the pipeline problem. This algorithm is implemented in no longer than
O(T*E) time. This dissertation also extends the study to examine some operating attributes and problem complexity of multiple-source pipelines. The multiple-source pipeline problem is also NP-complete. A heuristic algorithm modified from the one used in single-source pipeline problems is introduced. This algorithm can also be implemented in no longer than
O(T*E) time.
Computational results are presented for both methodologies on randomly generated problem sets. The computational experience indicates that reversed-flow algorithms provide good solutions in comparison with the optimal solutions. Only 25% of the problems tested were more than 30% greater than optimal values and approximately 40% of the tested problems were solved optimally by the algorithms.
Advisors/Committee Members: Garcia-Diaz, Alberto (advisor), Banerjee, Amarnath (committee member), Malave, Cesar O. (committee member), Tretter, Marietta J. (committee member).
Subjects/Keywords: Oil-Pipeline; Time-Windows; Pipeline Distribution
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Jittamai, P. (2006). Analysis of oil-pipeline distribution of multiple products subject to delivery time-windows. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/3112
Chicago Manual of Style (16th Edition):
Jittamai, Phongchai. “Analysis of oil-pipeline distribution of multiple products subject to delivery time-windows.” 2006. Doctoral Dissertation, Texas A&M University. Accessed March 04, 2021.
http://hdl.handle.net/1969.1/3112.
MLA Handbook (7th Edition):
Jittamai, Phongchai. “Analysis of oil-pipeline distribution of multiple products subject to delivery time-windows.” 2006. Web. 04 Mar 2021.
Vancouver:
Jittamai P. Analysis of oil-pipeline distribution of multiple products subject to delivery time-windows. [Internet] [Doctoral dissertation]. Texas A&M University; 2006. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/1969.1/3112.
Council of Science Editors:
Jittamai P. Analysis of oil-pipeline distribution of multiple products subject to delivery time-windows. [Doctoral Dissertation]. Texas A&M University; 2006. Available from: http://hdl.handle.net/1969.1/3112

Texas A&M University
24.
Seijo, Roberto L.
Modified (Q, r) Inventory Control Policy for an Assemble-to-Order Environment.
Degree: PhD, Industrial Engineering, 2010, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-2009-08-6993
► The traditional (Q,r) inventory control model assumes that the date at which the order is entered is the same as the date at which it…
(more)
▼ The traditional (Q,r) inventory control model assumes that the date at which the order is entered is the same as the date at which it is requested or expected to be delivered. Hence, the penalty cost is incurred when the customer places the order if inventory is unavailable. This is a reasonable assumption for retail systems and most distribution centers (DC), but not for an assemble-to-order (ATO) environment. In this scenario, there is a delivery time which is usually pre-negotiated and in addition to considering the manufacturing process time and in some cases the outbound transportation time, it also has some safety time built-in. This safety time is defined by the manufacturer and represents information related to when the penalty is incurred. The main objective of this research is to develop a modified (Q,r) policy that incorporates the safety time, and to evaluate this policy in terms of expected inventory cost and expected penalty cost / late orders. The problem is addressed following the heuristic approach discussed by Hadley and Whitin (1963). Two main models are developed based on the following assumptions: 1) early shipments are allowed by the customer, and 2) no early shipments are allowed. The behavior of both models is analyzed mathematically and by means of numerical examples. It is shown that from a manufacturer perspective, the first model is preferred over the traditional (Q,r) model. However, it poses a threat for the long term business relationship with the customer because the service level deteriorates, and for the implications that early shipments have on the customer inventory. The behavior of the second model is strictly related to the problem being addressed. Its merits with respect to the traditional and the "early shipment" model are discussed. This discussion is centered on the coefficient of variation of the lead-time demand, the ratio (IC/pi), and the location of the supplier. A final model which is a hybrid of the previous two shipping policies is developed.
The models developed in the course of this research are generalizations of the traditional (Q,r) model.
Advisors/Committee Members: Gaukler, Gary M. (advisor), Malave, Cesar O. (advisor), Lawrence, Barry (committee member), Smith, Don R. (committee member).
Subjects/Keywords: inventory management; (Q,r) inventory control policy; Supply Chain Management; assembler-to-order; heuristic approach
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Seijo, R. L. (2010). Modified (Q, r) Inventory Control Policy for an Assemble-to-Order Environment. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2009-08-6993
Chicago Manual of Style (16th Edition):
Seijo, Roberto L. “Modified (Q, r) Inventory Control Policy for an Assemble-to-Order Environment.” 2010. Doctoral Dissertation, Texas A&M University. Accessed March 04, 2021.
http://hdl.handle.net/1969.1/ETD-TAMU-2009-08-6993.
MLA Handbook (7th Edition):
Seijo, Roberto L. “Modified (Q, r) Inventory Control Policy for an Assemble-to-Order Environment.” 2010. Web. 04 Mar 2021.
Vancouver:
Seijo RL. Modified (Q, r) Inventory Control Policy for an Assemble-to-Order Environment. [Internet] [Doctoral dissertation]. Texas A&M University; 2010. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2009-08-6993.
Council of Science Editors:
Seijo RL. Modified (Q, r) Inventory Control Policy for an Assemble-to-Order Environment. [Doctoral Dissertation]. Texas A&M University; 2010. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2009-08-6993

Texas A&M University
25.
Rojas Gonzalez, Miguel Angel.
Design and Implementation of Switching Voltage Integrated Circuits Based on Sliding Mode Control.
Degree: PhD, Electrical Engineering, 2010, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-2009-08-7184
► The need for high performance circuits in systems with low-voltage and low-power requirements has exponentially increased during the few last years due to the sophistication…
(more)
▼ The need for high performance circuits in systems with low-voltage and low-power
requirements has exponentially increased during the few last years due to the sophistication
and miniaturization of electronic components. Most of these circuits are required to have a
very good efficiency behavior in order to extend the battery life of the device.
This dissertation addresses two important topics concerning very high efficiency
circuits with very high performance specifications. The first topic is the design and
implementation of class D audio power amplifiers, keeping their inherent high efficiency
characteristic while improving their linearity performance, reducing their quiescent power
consumption, and minimizing the silicon area. The second topic is the design and
implementation of switching voltage regulators and their controllers, to provide a low-cost,
compact, high efficient and reliable power conversion for integrated circuits.
The first part of this dissertation includes a short, although deep, analysis on class
D amplifiers, their history, principles of operation, architectures, performance metrics,
practical design considerations, and their present and future market distribution. Moreover,
the harmonic distortion of open-loop class D amplifiers based on pulse-width modulation
(PWM) is analyzed by applying the duty cycle variation technique for the most popular
carrier waveforms giving an easy and practical analytic method to evaluate the class
D amplifier distortion and determine its specifications for a given linearity requirement.
Additionally, three class D amplifiers, with an architecture based on sliding mode control, are proposed, designed, fabricated and tested. The amplifiers make use of a hysteretic
controller to avoid the need of complex overhead circuitry typically needed in other
architectures to compensate non-idealities of practical implementations. The design of the
amplifiers based on this technique is compact, small, reliable, and provides a performance
comparable to the state-of-the-art class D amplifiers, but consumes only one tenth of
quiescent power. This characteristic gives to the proposed amplifiers an advantage for
applications with minimal power consumption and very high performance requirements.
The second part of this dissertation presents the design, implementation, and testing
of switching voltage regulators. It starts with a description and brief analysis on the power
converters architectures. It outlines the advantages and drawbacks of the main topologies,
discusses practical design considerations, and compares their current and future market
distribution. Then, two different buck converters are proposed to overcome the most critical
issue in switching voltage regulators: to provide a stable voltage supply for electronic
devices, with good regulation voltage, high efficiency performance, and, most important,
a minimum number of components. The first buck converter, which has been designed,
fabricated and tested, is an integrated dual-output…
Advisors/Committee Members: Sanchez-Sinencio, Edgar (advisor), Silva-Martinez, Jose (committee member), Datta, Aniruddha (committee member), Malave, Cesar O. (committee member).
Subjects/Keywords: class D; audio amplifier; power amplifier; switching amplifier; sliding mode control; nonlinear control; power management; buck converter; voltage regulator; dual-output converter; poly-phase buck converter; switching converter; DC-DC converter; switching regulator
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Rojas Gonzalez, M. A. (2010). Design and Implementation of Switching Voltage Integrated Circuits Based on Sliding Mode Control. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2009-08-7184
Chicago Manual of Style (16th Edition):
Rojas Gonzalez, Miguel Angel. “Design and Implementation of Switching Voltage Integrated Circuits Based on Sliding Mode Control.” 2010. Doctoral Dissertation, Texas A&M University. Accessed March 04, 2021.
http://hdl.handle.net/1969.1/ETD-TAMU-2009-08-7184.
MLA Handbook (7th Edition):
Rojas Gonzalez, Miguel Angel. “Design and Implementation of Switching Voltage Integrated Circuits Based on Sliding Mode Control.” 2010. Web. 04 Mar 2021.
Vancouver:
Rojas Gonzalez MA. Design and Implementation of Switching Voltage Integrated Circuits Based on Sliding Mode Control. [Internet] [Doctoral dissertation]. Texas A&M University; 2010. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2009-08-7184.
Council of Science Editors:
Rojas Gonzalez MA. Design and Implementation of Switching Voltage Integrated Circuits Based on Sliding Mode Control. [Doctoral Dissertation]. Texas A&M University; 2010. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2009-08-7184

Texas A&M University
26.
Kang, Dong Hun.
Multi-commodity flow estimation with partial counts on selected links.
Degree: PhD, Industrial Engineering, 2007, Texas A&M University
URL: http://hdl.handle.net/1969.1/4693
► The purpose of this research is to formulate a multi-commodity network flow model for vehicular traffic in a geographic area and develop a procedure for…
(more)
▼ The purpose of this research is to formulate a multi-commodity network flow model
for vehicular traffic in a geographic area and develop a procedure for estimating traffic
counts based on available partial traffic data for a selected subset of highway links. Due
to the restriction of time and cost, traffic counts are not always observed for every
highway link. Typically, about 50% of the links have traffic counts in urban highway
networks. Also, it should be noted that the observed traffic counts are not free from
random errors during the data collection process. As a result, an incoming flow into a
highway node and an outgoing flow from the node do not usually match. They need to
be adjusted to satisfy a flow conservation condition, which is one of the fundamental
concepts in network flow analysis.
In this dissertation, the multi-commodity link flows are estimated in a two-stage
process. First, traffic flows of "empty" links, which have no observation data, are filled
with deterministic user equilibrium traffic assignments. This user equilibrium
assignment scheme assumes that travelers select their routes by their own interests
without considering total cost of the system. The assignment also considers congestion
effects by taking a link travel cost as a function of traffic volume on the link. As a result,
the assignment problem has a nonlinear objective function and linear network constraints.
The modified Frank-Wolfe algorithm, which is a type of conditional gradient method, is
used to solve the assignment problem. The next step is to consider both of the observed traffic counts on selected links and
the deterministic user equilibrium assignments on the group of remaining links to
produce the final traffic count estimates by the generalized least squares optimization
procedure. The generalized least squares optimization is conducted under a set of
relevant constraints, including the flow conservation condition for all highway
intersections.
Advisors/Committee Members: Garcia-Diaz, Alberto (advisor), Banerjee, Amarnath (committee member), Kihm, Kenneth (committee member), Malave, Cesar O. (committee member).
Subjects/Keywords: Traffic Flow Estimation; Multi-Commodity Network; User Equilibrium
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Kang, D. H. (2007). Multi-commodity flow estimation with partial counts on selected links. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/4693
Chicago Manual of Style (16th Edition):
Kang, Dong Hun. “Multi-commodity flow estimation with partial counts on selected links.” 2007. Doctoral Dissertation, Texas A&M University. Accessed March 04, 2021.
http://hdl.handle.net/1969.1/4693.
MLA Handbook (7th Edition):
Kang, Dong Hun. “Multi-commodity flow estimation with partial counts on selected links.” 2007. Web. 04 Mar 2021.
Vancouver:
Kang DH. Multi-commodity flow estimation with partial counts on selected links. [Internet] [Doctoral dissertation]. Texas A&M University; 2007. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/1969.1/4693.
Council of Science Editors:
Kang DH. Multi-commodity flow estimation with partial counts on selected links. [Doctoral Dissertation]. Texas A&M University; 2007. Available from: http://hdl.handle.net/1969.1/4693

Texas A&M University
27.
Chen, Ping-Shun.
Cost minimization in multi−commodity multi−mode generalized networks with time windows.
Degree: PhD, Industrial Engineering, 2007, Texas A&M University
URL: http://hdl.handle.net/1969.1/4779
► The purpose of this research is to develop a heuristic algorithm to minimize total costs in multi-commodity, multi-mode generalized networks with time windows problems. The…
(more)
▼ The purpose of this research is to develop a heuristic algorithm to minimize total
costs in multi-commodity, multi-mode generalized networks with time windows
problems. The proposed mathematical model incorporates features of the congestion of
vehicle flows and time restriction of delivering commodities. The heuristic algorithm,
HA, has two phases. Phase 1 provides lower and upper bounds based on Lagrangian
relaxations with subgradient methods. Phase 2 applies two methods, early due date with
overdue-date costs and total transportation costs, to search for an improved upper bound.
Two application networks are used to test HA for small and medium-scale
problems. A different number of commodities and various lengths of planning time
periods are generated. Results show that HA can provide good feasible solutions within
the reasonable range of optimal solutions. If optimal solutions are unknown, the average
gap between lower and upper bounds is 0.0239. Minimal and maximal gaps are 0.0007
and 0.3330. If optimal solutions are known, the maximal gap between upper bounds and
optimal solutions is less than 10% ranges of optimal solutions.
Advisors/Committee Members: Garcia-Diaz, Alberto (advisor), Akleman, Derya (committee member), Banerjee, Amarnath (committee member), Malave, Cesar O. (committee member).
Subjects/Keywords: Lagrangian relaxation; Multi-commodity; Multi-mode; Generalized network; Time windows
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Chen, P. (2007). Cost minimization in multi−commodity multi−mode generalized networks with time windows. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/4779
Chicago Manual of Style (16th Edition):
Chen, Ping-Shun. “Cost minimization in multi−commodity multi−mode generalized networks with time windows.” 2007. Doctoral Dissertation, Texas A&M University. Accessed March 04, 2021.
http://hdl.handle.net/1969.1/4779.
MLA Handbook (7th Edition):
Chen, Ping-Shun. “Cost minimization in multi−commodity multi−mode generalized networks with time windows.” 2007. Web. 04 Mar 2021.
Vancouver:
Chen P. Cost minimization in multi−commodity multi−mode generalized networks with time windows. [Internet] [Doctoral dissertation]. Texas A&M University; 2007. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/1969.1/4779.
Council of Science Editors:
Chen P. Cost minimization in multi−commodity multi−mode generalized networks with time windows. [Doctoral Dissertation]. Texas A&M University; 2007. Available from: http://hdl.handle.net/1969.1/4779

Texas A&M University
28.
Kim, Sun Woo.
Distributed optimization under partial information using direct interaction: a methodology and applications.
Degree: PhD, Industrial Engineering, 2007, Texas A&M University
URL: http://hdl.handle.net/1969.1/4831
► This research proposes a methodology to solve distributed optimization problems where quasi-autonomous decision entities directly interact with each other for partial information sharing. In the…
(more)
▼ This research proposes a methodology to solve distributed optimization problems
where quasi-autonomous decision entities directly interact with each other for partial
information sharing. In the distributed system we study the quasi-autonomy arising from
the assumption that each decision entity has complete and unique responsibility for a
subset of decision variables. However, when solving a decision problem locally,
consideration is given to how the local decisions affect overall system performance such
that close-to-optimal solutions are obtained among all participating decision entities.
Partial information sharing refers to the fact that no entity has the complete information
access needed to solve the optimization problem globally. This condition hinders the
direct application of traditional optimization solution methods. In this research, it is
further assumed that direct interaction among the decision entities is allowed. This
compensates for the lack of complete information access with the interactive exchange
of non-private information. The methodology is tested in different application contexts:
manufacturing capacity allocation, single machine scheduling, and jobshop scheduling.
The experimental results show that the proposed method generates close-to optimal
solutions in the tested problem settings.
Advisors/Committee Members: Leon, V. Jorge (advisor), Banerjee, Amarnath (committee member), Hsieh, Sheng-Jen (committee member), Malave, Cesar O. (committee member).
Subjects/Keywords: Distributed Optimization; Direct Interaction; Partial Information sharing
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Kim, S. W. (2007). Distributed optimization under partial information using direct interaction: a methodology and applications. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/4831
Chicago Manual of Style (16th Edition):
Kim, Sun Woo. “Distributed optimization under partial information using direct interaction: a methodology and applications.” 2007. Doctoral Dissertation, Texas A&M University. Accessed March 04, 2021.
http://hdl.handle.net/1969.1/4831.
MLA Handbook (7th Edition):
Kim, Sun Woo. “Distributed optimization under partial information using direct interaction: a methodology and applications.” 2007. Web. 04 Mar 2021.
Vancouver:
Kim SW. Distributed optimization under partial information using direct interaction: a methodology and applications. [Internet] [Doctoral dissertation]. Texas A&M University; 2007. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/1969.1/4831.
Council of Science Editors:
Kim SW. Distributed optimization under partial information using direct interaction: a methodology and applications. [Doctoral Dissertation]. Texas A&M University; 2007. Available from: http://hdl.handle.net/1969.1/4831

Texas A&M University
29.
Kotte Prakasam, Pradeep.
Joint synchronization and calibration of multi-channel transform-domain charge sampling receivers.
Degree: MS, Electrical Engineering, 2010, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-2009-05-292
► Transform-domain (TD) sampling is seen as a potential candidate for wideband and ultra-wideband high-performance receivers and is investigated in detail in this research. TD receivers…
(more)
▼ Transform-domain (TD) sampling is seen as a potential candidate for wideband
and ultra-wideband high-performance receivers and is investigated in detail in this
research. TD receivers expand the signal over a set of basis functions and operate on
the digitized basis coefficients. This parallel digital signal processing relaxes the sampling requirements opening the doors to higher dynamic range and wider bandwidth
in receivers. This research is focused on the implementation of a high performance
multi-channel wideband receiver that is based on Frequency-domain (FD) sampling,
a special case of TD sampling.
To achieve high dynamic ranges in these receivers, it is critical that the digital
post processing block matches the analog RF front end accurately. This accurate
matching has to be ensured across several process variations, mismatches and o�sets
that can be present in integrated circuit implementations. A unified model has been
defined for the FD multi-channel receiver that contains all these imperfections and
a joint synchronization and calibration technique, based on the Least-mean-squared
(LMS) algorithm, is presented to track them. A maximum likelihood (ML) algorithm
is used to estimate the frequency offset in carriers which is corrected prior to LMS
calibration. Simulation results are provided to support these concepts.
The sampling circuits in FD receivers are based on charge-sampling and a multi-channel charge-sampling receiver creates an inherent sinc filter-bank that has several
advantages compared to the conventional analog filter banks used in other multi-channel receivers. It is shown that the sinc filter banks, besides reduced analog
complexity, have very low computational complexity in data estimation which greatly
reduces the digital power consumption of these filters. The digital complexity of data
estimation in the sinc fiter bank is shown to be less than 1=10th of the complexity
in analog filter banks.
Advisors/Committee Members: Hoyos, Sebastian (advisor), Silva-Martinez, Jose (committee member), Pfister, Henry (committee member), Malave, Cesar O. (committee member).
Subjects/Keywords: transform-domain; sinc filter bank; multi-channel receiver; calibration; charge sampling; complexity
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Kotte Prakasam, P. (2010). Joint synchronization and calibration of multi-channel transform-domain charge sampling receivers. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2009-05-292
Chicago Manual of Style (16th Edition):
Kotte Prakasam, Pradeep. “Joint synchronization and calibration of multi-channel transform-domain charge sampling receivers.” 2010. Masters Thesis, Texas A&M University. Accessed March 04, 2021.
http://hdl.handle.net/1969.1/ETD-TAMU-2009-05-292.
MLA Handbook (7th Edition):
Kotte Prakasam, Pradeep. “Joint synchronization and calibration of multi-channel transform-domain charge sampling receivers.” 2010. Web. 04 Mar 2021.
Vancouver:
Kotte Prakasam P. Joint synchronization and calibration of multi-channel transform-domain charge sampling receivers. [Internet] [Masters thesis]. Texas A&M University; 2010. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2009-05-292.
Council of Science Editors:
Kotte Prakasam P. Joint synchronization and calibration of multi-channel transform-domain charge sampling receivers. [Masters Thesis]. Texas A&M University; 2010. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2009-05-292

Texas A&M University
30.
Pandey, Pankaj.
A CMOS 500MHz continuous-time fourth order 0.05degree equiripple linear phase filter with automatic tuning.
Degree: MS, Electrical Engineering, 2004, Texas A&M University
URL: http://hdl.handle.net/1969.1/68
► The growing demand of portable electronic equipment and system-on-a-chip has been pushing the industry to design circuits with very low power supply voltage and low…
(more)
▼ The growing demand of portable electronic equipment and system-on-a-chip has been pushing the industry to design circuits with very low power supply voltage and low power consumption. The Hard Disk drive industry is looking for developments in the read channel chip to push the data rates to higher speed, along with a low voltage and low cost solution. Read channel requires high-speed linear phase filters to meet these objectives. The primary objective of this project is to design, layout, and characterize a 4th-order continuous-time equiripple linear phase filter with automatic tuning system. The main requirements for design are high speed, low group delay variations, good linearity and power efficiency.
This filter features wide cut-off frequency 500MHz, which is far beyond the current state-of-the-art. The linear phase filter is based on Gm-C biquadratics. Higher speed has been achieved by minimizing the parasitics and a complementary input stage OTA. A common mode feedback (CMFB), which ensures stability at such high frequencies, has also been designed. The inaccuracies of the filter are compensated by using a simple automatic tuning system.
The design is fabricated in 0.35 um TSMC CMOS process technology. The design was simulated in Cadence using SPICE models provided by MOSIS for the 0.35 um TSMC process in the presence of parasitic capacitance and transistor non-idealities. Cut-off frequency of 500 MHz was achieved along with a 9% variation in the group delay.
Advisors/Committee Members: Silva-Martinez, Jose (advisor), Sanchez-Sinencio, Edgar (committee member), Karsilayan, Aydin (committee member), Kezunovic, Mladen (committee member), Malave, Cesar O. (committee member).
Subjects/Keywords: Linear; Phase; Tuning; Filter
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Pandey, P. (2004). A CMOS 500MHz continuous-time fourth order 0.05degree equiripple linear phase filter with automatic tuning. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/68
Chicago Manual of Style (16th Edition):
Pandey, Pankaj. “A CMOS 500MHz continuous-time fourth order 0.05degree equiripple linear phase filter with automatic tuning.” 2004. Masters Thesis, Texas A&M University. Accessed March 04, 2021.
http://hdl.handle.net/1969.1/68.
MLA Handbook (7th Edition):
Pandey, Pankaj. “A CMOS 500MHz continuous-time fourth order 0.05degree equiripple linear phase filter with automatic tuning.” 2004. Web. 04 Mar 2021.
Vancouver:
Pandey P. A CMOS 500MHz continuous-time fourth order 0.05degree equiripple linear phase filter with automatic tuning. [Internet] [Masters thesis]. Texas A&M University; 2004. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/1969.1/68.
Council of Science Editors:
Pandey P. A CMOS 500MHz continuous-time fourth order 0.05degree equiripple linear phase filter with automatic tuning. [Masters Thesis]. Texas A&M University; 2004. Available from: http://hdl.handle.net/1969.1/68
.