+publisher:"Texas A&M University" +contributor:("Malave, Cesar O")

Texas A&M University

1. Zuniga, Gerald Alexander. Layer of protection analysis applied to ammonia refrigeration systems.

Degree: 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 (6^th Edition):

Zuniga, G. A. (2009). Layer of protection analysis applied to ammonia refrigeration systems. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-3133

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Zuniga, Gerald Alexander. “Layer of protection analysis applied to ammonia refrigeration systems.” 2009. Thesis, Texas A&M University. Accessed December 05, 2019. http://hdl.handle.net/1969.1/ETD-TAMU-3133.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Zuniga, Gerald Alexander. “Layer of protection analysis applied to ammonia refrigeration systems.” 2009. Web. 05 Dec 2019.

Vancouver:

Zuniga GA. Layer of protection analysis applied to ammonia refrigeration systems. [Internet] [Thesis]. Texas A&M University; 2009. [cited 2019 Dec 05]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-3133.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Zuniga GA. Layer of protection analysis applied to ammonia refrigeration systems. [Thesis]. Texas A&M University; 2009. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-3133

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Texas A&M University

2. Schomerus, Aaron Michael. Effectiveness of various techniques in reducing noise generated in measuring torsional vibration.

Degree: 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 (6^th Edition):

Schomerus, A. M. (2009). Effectiveness of various techniques in reducing noise generated in measuring torsional vibration. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-1574

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Schomerus, Aaron Michael. “Effectiveness of various techniques in reducing noise generated in measuring torsional vibration.” 2009. Thesis, Texas A&M University. Accessed December 05, 2019. http://hdl.handle.net/1969.1/ETD-TAMU-1574.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Schomerus, Aaron Michael. “Effectiveness of various techniques in reducing noise generated in measuring torsional vibration.” 2009. Web. 05 Dec 2019.

Vancouver:

Schomerus AM. Effectiveness of various techniques in reducing noise generated in measuring torsional vibration. [Internet] [Thesis]. Texas A&M University; 2009. [cited 2019 Dec 05]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1574.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Schomerus AM. Effectiveness of various techniques in reducing noise generated in measuring torsional vibration. [Thesis]. Texas A&M University; 2009. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1574

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Texas A&M University

3. Breedlove, Anthony Wayne. Experimental identification of structural force coefficients in a bump-type foil bearing.

Degree: 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 (6^th Edition):

Breedlove, A. W. (2009). Experimental identification of structural force coefficients in a bump-type foil bearing. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-1936

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Breedlove, Anthony Wayne. “Experimental identification of structural force coefficients in a bump-type foil bearing.” 2009. Thesis, Texas A&M University. Accessed December 05, 2019. http://hdl.handle.net/1969.1/ETD-TAMU-1936.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Breedlove, Anthony Wayne. “Experimental identification of structural force coefficients in a bump-type foil bearing.” 2009. Web. 05 Dec 2019.

Vancouver:

Breedlove AW. Experimental identification of structural force coefficients in a bump-type foil bearing. [Internet] [Thesis]. Texas A&M University; 2009. [cited 2019 Dec 05]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1936.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Breedlove AW. Experimental identification of structural force coefficients in a bump-type foil bearing. [Thesis]. Texas A&M University; 2009. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1936

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Texas A&M University

4. Jones, Adam Matthew. Experimental examination of wire mesh dampers subjected to large amplitude displacements.

Degree: 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)

Subjects/Keywords: wire; mesh; dampers; displacement

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APA (6^th Edition):

Jones, A. M. (2009). Experimental examination of wire mesh dampers subjected to large amplitude displacements. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-1939

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Jones, Adam Matthew. “Experimental examination of wire mesh dampers subjected to large amplitude displacements.” 2009. Thesis, Texas A&M University. Accessed December 05, 2019. http://hdl.handle.net/1969.1/ETD-TAMU-1939.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Jones, Adam Matthew. “Experimental examination of wire mesh dampers subjected to large amplitude displacements.” 2009. Web. 05 Dec 2019.

Vancouver:

Jones AM. Experimental examination of wire mesh dampers subjected to large amplitude displacements. [Internet] [Thesis]. Texas A&M University; 2009. [cited 2019 Dec 05]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1939.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Jones AM. Experimental examination of wire mesh dampers subjected to large amplitude displacements. [Thesis]. Texas A&M University; 2009. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1939

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Texas A&M University

5. Ruiz Vasquez, Roberto. Study of the Effects of Obstacles in Liquefied Natural Gas (LNG) Vapor Dispersion using CFD Modeling.

Degree: 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)

Subjects/Keywords: LNG; dispersion modeling; CFD; safety distance

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APA (6^th Edition):

Ruiz Vasquez, R. (2012). Study of the Effects of Obstacles in Liquefied Natural Gas (LNG) Vapor Dispersion using CFD Modeling. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11675

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Ruiz Vasquez, Roberto. “Study of the Effects of Obstacles in Liquefied Natural Gas (LNG) Vapor Dispersion using CFD Modeling.” 2012. Thesis, Texas A&M University. Accessed December 05, 2019. http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11675.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Ruiz Vasquez, Roberto. “Study of the Effects of Obstacles in Liquefied Natural Gas (LNG) Vapor Dispersion using CFD Modeling.” 2012. Web. 05 Dec 2019.

Vancouver:

Ruiz Vasquez R. Study of the Effects of Obstacles in Liquefied Natural Gas (LNG) Vapor Dispersion using CFD Modeling. [Internet] [Thesis]. Texas A&M University; 2012. [cited 2019 Dec 05]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11675.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Ruiz Vasquez R. Study of the Effects of Obstacles in Liquefied Natural Gas (LNG) Vapor Dispersion using CFD Modeling. [Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11675

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Texas A&M University

6. Fan, Xiaohua. High performance building blocks for wireless receiver: multi-stage amplifiers and low noise amplifiers.

Degree: 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)

Subjects/Keywords: Multi-stage amplifier; Low noise amplifier; LNA; UWB; BIT

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APA (6^th Edition):

Fan, X. (2009). High performance building blocks for wireless receiver: multi-stage amplifiers and low noise amplifiers. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2497

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Fan, Xiaohua. “High performance building blocks for wireless receiver: multi-stage amplifiers and low noise amplifiers.” 2009. Thesis, Texas A&M University. Accessed December 05, 2019. http://hdl.handle.net/1969.1/ETD-TAMU-2497.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Fan, Xiaohua. “High performance building blocks for wireless receiver: multi-stage amplifiers and low noise amplifiers.” 2009. Web. 05 Dec 2019.

Vancouver:

Fan X. High performance building blocks for wireless receiver: multi-stage amplifiers and low noise amplifiers. [Internet] [Thesis]. Texas A&M University; 2009. [cited 2019 Dec 05]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2497.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Fan X. High performance building blocks for wireless receiver: multi-stage amplifiers and low noise amplifiers. [Thesis]. Texas A&M University; 2009. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2497

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Texas A&M University

7. Mays, Patricia Faye. Seal strength models for medical device trays.

Degree: 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 (6^th Edition):

Mays, P. F. (2009). Seal strength models for medical device trays. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2756

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Mays, Patricia Faye. “Seal strength models for medical device trays.” 2009. Thesis, Texas A&M University. Accessed December 05, 2019. http://hdl.handle.net/1969.1/ETD-TAMU-2756.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Mays, Patricia Faye. “Seal strength models for medical device trays.” 2009. Web. 05 Dec 2019.

Vancouver:

Mays PF. Seal strength models for medical device trays. [Internet] [Thesis]. Texas A&M University; 2009. [cited 2019 Dec 05]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2756.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Mays PF. Seal strength models for medical device trays. [Thesis]. Texas A&M University; 2009. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2756

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Texas A&M University

8. Kulkarni, Mandar Shashikant. Implementation of a 1GHZ frontend using transform domain charge sampling techniques.

Degree: 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)

Subjects/Keywords: Software Defined Radio (SDR); Charge sampling; downsampling; sinc; FIR; IIR; antialiasing

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Kulkarni, M. S. (2009). Implementation of a 1GHZ frontend using transform domain charge sampling techniques. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-3158

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Kulkarni, Mandar Shashikant. “Implementation of a 1GHZ frontend using transform domain charge sampling techniques.” 2009. Thesis, Texas A&M University. Accessed December 05, 2019. http://hdl.handle.net/1969.1/ETD-TAMU-3158.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Kulkarni, Mandar Shashikant. “Implementation of a 1GHZ frontend using transform domain charge sampling techniques.” 2009. Web. 05 Dec 2019.

Vancouver:

Kulkarni MS. Implementation of a 1GHZ frontend using transform domain charge sampling techniques. [Internet] [Thesis]. Texas A&M University; 2009. [cited 2019 Dec 05]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-3158.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Kulkarni MS. Implementation of a 1GHZ frontend using transform domain charge sampling techniques. [Thesis]. Texas A&M University; 2009. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-3158

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Texas A&M University

9. Kotte Prakasam, Pradeep. Joint synchronization and calibration of multi-channel transform-domain charge sampling receivers.

Degree: 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 (6^th Edition):

Kotte Prakasam, P. (2010). Joint synchronization and calibration of multi-channel transform-domain charge sampling receivers. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2009-05-292

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Kotte Prakasam, Pradeep. “Joint synchronization and calibration of multi-channel transform-domain charge sampling receivers.” 2010. Thesis, Texas A&M University. Accessed December 05, 2019. http://hdl.handle.net/1969.1/ETD-TAMU-2009-05-292.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Kotte Prakasam, Pradeep. “Joint synchronization and calibration of multi-channel transform-domain charge sampling receivers.” 2010. Web. 05 Dec 2019.

Vancouver:

Kotte Prakasam P. Joint synchronization and calibration of multi-channel transform-domain charge sampling receivers. [Internet] [Thesis]. Texas A&M University; 2010. [cited 2019 Dec 05]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2009-05-292.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Kotte Prakasam P. Joint synchronization and calibration of multi-channel transform-domain charge sampling receivers. [Thesis]. Texas A&M University; 2010. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2009-05-292

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Texas A&M University

10. Seijo, Roberto L. Modified (Q, r) Inventory Control Policy for an Assemble-to-Order Environment.

Degree: 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 (6^th Edition):

Seijo, R. L. (2010). Modified (Q, r) Inventory Control Policy for an Assemble-to-Order Environment. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2009-08-6993

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Seijo, Roberto L. “Modified (Q, r) Inventory Control Policy for an Assemble-to-Order Environment.” 2010. Thesis, Texas A&M University. Accessed December 05, 2019. http://hdl.handle.net/1969.1/ETD-TAMU-2009-08-6993.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Seijo, Roberto L. “Modified (Q, r) Inventory Control Policy for an Assemble-to-Order Environment.” 2010. Web. 05 Dec 2019.

Vancouver:

Seijo RL. Modified (Q, r) Inventory Control Policy for an Assemble-to-Order Environment. [Internet] [Thesis]. Texas A&M University; 2010. [cited 2019 Dec 05]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2009-08-6993.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Seijo RL. Modified (Q, r) Inventory Control Policy for an Assemble-to-Order Environment. [Thesis]. Texas A&M University; 2010. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2009-08-6993

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Texas A&M University

11. Rojas Gonzalez, Miguel Angel. Design and Implementation of Switching Voltage Integrated Circuits Based on Sliding Mode Control.

Degree: 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 (6^th Edition):

Rojas Gonzalez, M. A. (2010). Design and Implementation of Switching Voltage Integrated Circuits Based on Sliding Mode Control. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2009-08-7184

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Rojas Gonzalez, Miguel Angel. “Design and Implementation of Switching Voltage Integrated Circuits Based on Sliding Mode Control.” 2010. Thesis, Texas A&M University. Accessed December 05, 2019. http://hdl.handle.net/1969.1/ETD-TAMU-2009-08-7184.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Rojas Gonzalez, Miguel Angel. “Design and Implementation of Switching Voltage Integrated Circuits Based on Sliding Mode Control.” 2010. Web. 05 Dec 2019.

Vancouver:

Rojas Gonzalez MA. Design and Implementation of Switching Voltage Integrated Circuits Based on Sliding Mode Control. [Internet] [Thesis]. Texas A&M University; 2010. [cited 2019 Dec 05]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2009-08-7184.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Rojas Gonzalez MA. Design and Implementation of Switching Voltage Integrated Circuits Based on Sliding Mode Control. [Thesis]. Texas A&M University; 2010. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2009-08-7184

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Texas A&M University

12. Mendez Pinero, Mayra I. Decision Support System (DSS) for Machine Selection: A Cost Minimization Model.

Degree: 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 (6^th Edition):

Mendez Pinero, M. I. (2010). Decision Support System (DSS) for Machine Selection: A Cost Minimization Model. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2009-05-645

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Mendez Pinero, Mayra I. “Decision Support System (DSS) for Machine Selection: A Cost Minimization Model.” 2010. Thesis, Texas A&M University. Accessed December 05, 2019. http://hdl.handle.net/1969.1/ETD-TAMU-2009-05-645.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Mendez Pinero, Mayra I. “Decision Support System (DSS) for Machine Selection: A Cost Minimization Model.” 2010. Web. 05 Dec 2019.

Vancouver:

Mendez Pinero MI. Decision Support System (DSS) for Machine Selection: A Cost Minimization Model. [Internet] [Thesis]. Texas A&M University; 2010. [cited 2019 Dec 05]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2009-05-645.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Mendez Pinero MI. Decision Support System (DSS) for Machine Selection: A Cost Minimization Model. [Thesis]. Texas A&M University; 2010. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2009-05-645

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Texas A&M University

13. Mena Lopez, Hugo Eduardo. Maximum power tracking control scheme for wind generator systems.

Degree: 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)

Subjects/Keywords: Wind Power; Wind energy; Maximun power controller

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APA (6^th Edition):

Mena Lopez, H. E. (2009). Maximum power tracking control scheme for wind generator systems. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2063

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Mena Lopez, Hugo Eduardo. “Maximum power tracking control scheme for wind generator systems.” 2009. Thesis, Texas A&M University. Accessed December 05, 2019. http://hdl.handle.net/1969.1/ETD-TAMU-2063.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Mena Lopez, Hugo Eduardo. “Maximum power tracking control scheme for wind generator systems.” 2009. Web. 05 Dec 2019.

Vancouver:

Mena Lopez HE. Maximum power tracking control scheme for wind generator systems. [Internet] [Thesis]. Texas A&M University; 2009. [cited 2019 Dec 05]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2063.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Mena Lopez HE. Maximum power tracking control scheme for wind generator systems. [Thesis]. Texas A&M University; 2009. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2063

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Texas A&M University

14. Andujar-De Sanctis, Ivonne. Unusual Intramolecular Kinetic Isotope Effects: Selectivity beyond Transition State Theory?s Jurisdiction.

Degree: 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)

Subjects/Keywords: N/A

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APA (6^th Edition):

Andujar-De Sanctis, I. (2014). Unusual Intramolecular Kinetic Isotope Effects: Selectivity beyond Transition State Theory?s Jurisdiction. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/153893

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Andujar-De Sanctis, Ivonne. “Unusual Intramolecular Kinetic Isotope Effects: Selectivity beyond Transition State Theory?s Jurisdiction.” 2014. Thesis, Texas A&M University. Accessed December 05, 2019. http://hdl.handle.net/1969.1/153893.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Andujar-De Sanctis, Ivonne. “Unusual Intramolecular Kinetic Isotope Effects: Selectivity beyond Transition State Theory?s Jurisdiction.” 2014. Web. 05 Dec 2019.

Vancouver:

Andujar-De Sanctis I. Unusual Intramolecular Kinetic Isotope Effects: Selectivity beyond Transition State Theory?s Jurisdiction. [Internet] [Thesis]. Texas A&M University; 2014. [cited 2019 Dec 05]. Available from: http://hdl.handle.net/1969.1/153893.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Andujar-De Sanctis I. Unusual Intramolecular Kinetic Isotope Effects: Selectivity beyond Transition State Theory?s Jurisdiction. [Thesis]. Texas A&M University; 2014. Available from: http://hdl.handle.net/1969.1/153893

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

15. Perez Roman, Eduardo. Simulation and Optimization Models for Scheduling Multi-step Sequential Procedures in Nuclear Medicine.

Degree: 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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APA (6^th Edition):

Perez Roman, E. (2011). Simulation and Optimization Models for Scheduling Multi-step Sequential Procedures in Nuclear Medicine. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-7958

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Perez Roman, Eduardo. “Simulation and Optimization Models for Scheduling Multi-step Sequential Procedures in Nuclear Medicine.” 2011. Thesis, Texas A&M University. Accessed December 05, 2019. http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-7958.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Perez Roman, Eduardo. “Simulation and Optimization Models for Scheduling Multi-step Sequential Procedures in Nuclear Medicine.” 2011. Web. 05 Dec 2019.

Vancouver:

Perez Roman E. Simulation and Optimization Models for Scheduling Multi-step Sequential Procedures in Nuclear Medicine. [Internet] [Thesis]. Texas A&M University; 2011. [cited 2019 Dec 05]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-7958.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Perez Roman E. Simulation and Optimization Models for Scheduling Multi-step Sequential Procedures in Nuclear Medicine. [Thesis]. Texas A&M University; 2011. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-7958

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

16. Uriarte, Fabian Marcel. A Partitioning Approach for Parallel Simulation of AC-Radial Shipboard Power Systems.

Degree: 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 (6^th Edition):

Uriarte, F. M. (2011). A Partitioning Approach for Parallel Simulation of AC-Radial Shipboard Power Systems. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-7729

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Uriarte, Fabian Marcel. “A Partitioning Approach for Parallel Simulation of AC-Radial Shipboard Power Systems.” 2011. Thesis, Texas A&M University. Accessed December 05, 2019. http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-7729.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Uriarte, Fabian Marcel. “A Partitioning Approach for Parallel Simulation of AC-Radial Shipboard Power Systems.” 2011. Web. 05 Dec 2019.

Vancouver:

Uriarte FM. A Partitioning Approach for Parallel Simulation of AC-Radial Shipboard Power Systems. [Internet] [Thesis]. Texas A&M University; 2011. [cited 2019 Dec 05]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-7729.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Uriarte FM. A Partitioning Approach for Parallel Simulation of AC-Radial Shipboard Power Systems. [Thesis]. Texas A&M University; 2011. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-7729

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Texas A&M University

17. Chander, Karthik Balachandran. Adaptive tool selection strategies for drilling in flexible manufacturing systems.

Degree: 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)

Subjects/Keywords: Adaptive Tool Selection; Flexible Manufacturing System; Drilling; Tool Life

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APA (6^th Edition):

Chander, K. B. (2004). Adaptive tool selection strategies for drilling in flexible manufacturing systems. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/566

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Chander, Karthik Balachandran. “Adaptive tool selection strategies for drilling in flexible manufacturing systems.” 2004. Thesis, Texas A&M University. Accessed December 05, 2019. http://hdl.handle.net/1969.1/566.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Chander, Karthik Balachandran. “Adaptive tool selection strategies for drilling in flexible manufacturing systems.” 2004. Web. 05 Dec 2019.

Vancouver:

Chander KB. Adaptive tool selection strategies for drilling in flexible manufacturing systems. [Internet] [Thesis]. Texas A&M University; 2004. [cited 2019 Dec 05]. Available from: http://hdl.handle.net/1969.1/566.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Chander KB. Adaptive tool selection strategies for drilling in flexible manufacturing systems. [Thesis]. Texas A&M University; 2004. Available from: http://hdl.handle.net/1969.1/566

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Texas A&M University

18. Choi, Young Keun. Tool path generation and 3D tolerance analysis for free-form surfaces.

Degree: 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)

Subjects/Keywords: CAD/CAM; Tool path generation; NC machining; Tolerance anaysis

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APA (6^th Edition):

Choi, Y. K. (2005). Tool path generation and 3D tolerance analysis for free-form surfaces. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/2237

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Choi, Young Keun. “Tool path generation and 3D tolerance analysis for free-form surfaces.” 2005. Thesis, Texas A&M University. Accessed December 05, 2019. http://hdl.handle.net/1969.1/2237.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Choi, Young Keun. “Tool path generation and 3D tolerance analysis for free-form surfaces.” 2005. Web. 05 Dec 2019.

Vancouver:

Choi YK. Tool path generation and 3D tolerance analysis for free-form surfaces. [Internet] [Thesis]. Texas A&M University; 2005. [cited 2019 Dec 05]. Available from: http://hdl.handle.net/1969.1/2237.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Choi YK. Tool path generation and 3D tolerance analysis for free-form surfaces. [Thesis]. Texas A&M University; 2005. Available from: http://hdl.handle.net/1969.1/2237

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Texas A&M University

19. Jittamai, Phongchai. Analysis of oil-pipeline distribution of multiple products subject to delivery time-windows.

Degree: 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 (6^th Edition):

Jittamai, P. (2006). Analysis of oil-pipeline distribution of multiple products subject to delivery time-windows. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/3112

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Jittamai, Phongchai. “Analysis of oil-pipeline distribution of multiple products subject to delivery time-windows.” 2006. Thesis, Texas A&M University. Accessed December 05, 2019. http://hdl.handle.net/1969.1/3112.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Jittamai, Phongchai. “Analysis of oil-pipeline distribution of multiple products subject to delivery time-windows.” 2006. Web. 05 Dec 2019.

Vancouver:

Jittamai P. Analysis of oil-pipeline distribution of multiple products subject to delivery time-windows. [Internet] [Thesis]. Texas A&M University; 2006. [cited 2019 Dec 05]. Available from: http://hdl.handle.net/1969.1/3112.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Jittamai P. Analysis of oil-pipeline distribution of multiple products subject to delivery time-windows. [Thesis]. Texas A&M University; 2006. Available from: http://hdl.handle.net/1969.1/3112

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Texas A&M University

20. Kang, Dong Hun. Multi-commodity flow estimation with partial counts on selected links.

Degree: 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 (6^th Edition):

Kang, D. H. (2007). Multi-commodity flow estimation with partial counts on selected links. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/4693

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Kang, Dong Hun. “Multi-commodity flow estimation with partial counts on selected links.” 2007. Thesis, Texas A&M University. Accessed December 05, 2019. http://hdl.handle.net/1969.1/4693.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Kang, Dong Hun. “Multi-commodity flow estimation with partial counts on selected links.” 2007. Web. 05 Dec 2019.

Vancouver:

Kang DH. Multi-commodity flow estimation with partial counts on selected links. [Internet] [Thesis]. Texas A&M University; 2007. [cited 2019 Dec 05]. Available from: http://hdl.handle.net/1969.1/4693.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Kang DH. Multi-commodity flow estimation with partial counts on selected links. [Thesis]. Texas A&M University; 2007. Available from: http://hdl.handle.net/1969.1/4693

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Texas A&M University

21. Chen, Ping-Shun. Cost minimization in multi−commodity multi−mode generalized networks with time windows.

Degree: 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)

Subjects/Keywords: Lagrangian relaxation; Multi-commodity; Multi-mode; Generalized network; Time windows

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APA (6^th Edition):

Chen, P. (2007). Cost minimization in multi−commodity multi−mode generalized networks with time windows. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/4779

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Chen, Ping-Shun. “Cost minimization in multi−commodity multi−mode generalized networks with time windows.” 2007. Thesis, Texas A&M University. Accessed December 05, 2019. http://hdl.handle.net/1969.1/4779.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Chen, Ping-Shun. “Cost minimization in multi−commodity multi−mode generalized networks with time windows.” 2007. Web. 05 Dec 2019.

Vancouver:

Chen P. Cost minimization in multi−commodity multi−mode generalized networks with time windows. [Internet] [Thesis]. Texas A&M University; 2007. [cited 2019 Dec 05]. Available from: http://hdl.handle.net/1969.1/4779.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Chen P. Cost minimization in multi−commodity multi−mode generalized networks with time windows. [Thesis]. Texas A&M University; 2007. Available from: http://hdl.handle.net/1969.1/4779

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Texas A&M University

22. Kim, Sun Woo. Distributed optimization under partial information using direct interaction: a methodology and applications.

Degree: 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)

Subjects/Keywords: Distributed Optimization; Direct Interaction; Partial Information sharing

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APA (6^th Edition):

Kim, S. W. (2007). Distributed optimization under partial information using direct interaction: a methodology and applications. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/4831

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Kim, Sun Woo. “Distributed optimization under partial information using direct interaction: a methodology and applications.” 2007. Thesis, Texas A&M University. Accessed December 05, 2019. http://hdl.handle.net/1969.1/4831.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Kim, Sun Woo. “Distributed optimization under partial information using direct interaction: a methodology and applications.” 2007. Web. 05 Dec 2019.

Vancouver:

Kim SW. Distributed optimization under partial information using direct interaction: a methodology and applications. [Internet] [Thesis]. Texas A&M University; 2007. [cited 2019 Dec 05]. Available from: http://hdl.handle.net/1969.1/4831.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Kim SW. Distributed optimization under partial information using direct interaction: a methodology and applications. [Thesis]. Texas A&M University; 2007. Available from: http://hdl.handle.net/1969.1/4831

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Texas A&M University

23. 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: 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 (6^th 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. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/5757

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th 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. Thesis, Texas A&M University. Accessed December 05, 2019. http://hdl.handle.net/1969.1/5757.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th 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. 05 Dec 2019.

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] [Thesis]. Texas A&M University; 2007. [cited 2019 Dec 05]. Available from: http://hdl.handle.net/1969.1/5757.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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. [Thesis]. Texas A&M University; 2007. Available from: http://hdl.handle.net/1969.1/5757

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Texas A&M University

24. Shim, Young Hak. Design of a cluster analysis heuristic for the configuration and capacity management of manufacturing cells.

Degree: 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 (6^th Edition):

Shim, Y. H. (2007). Design of a cluster analysis heuristic for the configuration and capacity management of manufacturing cells. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/5905

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Shim, Young Hak. “Design of a cluster analysis heuristic for the configuration and capacity management of manufacturing cells.” 2007. Thesis, Texas A&M University. Accessed December 05, 2019. http://hdl.handle.net/1969.1/5905.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Shim, Young Hak. “Design of a cluster analysis heuristic for the configuration and capacity management of manufacturing cells.” 2007. Web. 05 Dec 2019.

Vancouver:

Shim YH. Design of a cluster analysis heuristic for the configuration and capacity management of manufacturing cells. [Internet] [Thesis]. Texas A&M University; 2007. [cited 2019 Dec 05]. Available from: http://hdl.handle.net/1969.1/5905.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Shim YH. Design of a cluster analysis heuristic for the configuration and capacity management of manufacturing cells. [Thesis]. Texas A&M University; 2007. Available from: http://hdl.handle.net/1969.1/5905

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Texas A&M University

25. Scott, Wesley Dane. A flexible control system for flexible manufacturing systems.

Degree: 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)

Subjects/Keywords: Petri nets; neural networks; genetic algorithm; flexible manufacturing systems; FMS; hierarchical control

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APA (6^th Edition):

Scott, W. D. (2004). A flexible control system for flexible manufacturing systems. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/158

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Scott, Wesley Dane. “A flexible control system for flexible manufacturing systems.” 2004. Thesis, Texas A&M University. Accessed December 05, 2019. http://hdl.handle.net/1969.1/158.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Scott, Wesley Dane. “A flexible control system for flexible manufacturing systems.” 2004. Web. 05 Dec 2019.

Vancouver:

Scott WD. A flexible control system for flexible manufacturing systems. [Internet] [Thesis]. Texas A&M University; 2004. [cited 2019 Dec 05]. Available from: http://hdl.handle.net/1969.1/158.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Scott WD. A flexible control system for flexible manufacturing systems. [Thesis]. Texas A&M University; 2004. Available from: http://hdl.handle.net/1969.1/158

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Texas A&M University

26. Lee, Jong Hwan. A hierarchical heuristic approach for machine loading problems in a partially grouped environment.

Degree: 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 (6^th Edition):

Lee, J. H. (2004). A hierarchical heuristic approach for machine loading problems in a partially grouped environment. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/229

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Lee, Jong Hwan. “A hierarchical heuristic approach for machine loading problems in a partially grouped environment.” 2004. Thesis, Texas A&M University. Accessed December 05, 2019. http://hdl.handle.net/1969.1/229.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Lee, Jong Hwan. “A hierarchical heuristic approach for machine loading problems in a partially grouped environment.” 2004. Web. 05 Dec 2019.

Vancouver:

Lee JH. A hierarchical heuristic approach for machine loading problems in a partially grouped environment. [Internet] [Thesis]. Texas A&M University; 2004. [cited 2019 Dec 05]. Available from: http://hdl.handle.net/1969.1/229.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Lee JH. A hierarchical heuristic approach for machine loading problems in a partially grouped environment. [Thesis]. Texas A&M University; 2004. Available from: http://hdl.handle.net/1969.1/229

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Texas A&M University

27. Yoo, Jaewook. Multi-period optimization of pavement management systems.

Degree: 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 (6^th Edition):

Yoo, J. (2004). Multi-period optimization of pavement management systems. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/343

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Yoo, Jaewook. “Multi-period optimization of pavement management systems.” 2004. Thesis, Texas A&M University. Accessed December 05, 2019. http://hdl.handle.net/1969.1/343.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Yoo, Jaewook. “Multi-period optimization of pavement management systems.” 2004. Web. 05 Dec 2019.

Vancouver:

Yoo J. Multi-period optimization of pavement management systems. [Internet] [Thesis]. Texas A&M University; 2004. [cited 2019 Dec 05]. Available from: http://hdl.handle.net/1969.1/343.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Yoo J. Multi-period optimization of pavement management systems. [Thesis]. Texas A&M University; 2004. Available from: http://hdl.handle.net/1969.1/343

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Texas A&M University

28. Melouk, Sharif. Transportation system modeling using the High Level Architecture.

Degree: 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)

Subjects/Keywords: High Level Architecture; Distributed Simulation

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Melouk, S. (2004). Transportation system modeling using the High Level Architecture. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/440

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Melouk, Sharif. “Transportation system modeling using the High Level Architecture.” 2004. Thesis, Texas A&M University. Accessed December 05, 2019. http://hdl.handle.net/1969.1/440.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Melouk, Sharif. “Transportation system modeling using the High Level Architecture.” 2004. Web. 05 Dec 2019.

Vancouver:

Melouk S. Transportation system modeling using the High Level Architecture. [Internet] [Thesis]. Texas A&M University; 2004. [cited 2019 Dec 05]. Available from: http://hdl.handle.net/1969.1/440.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Melouk S. Transportation system modeling using the High Level Architecture. [Thesis]. Texas A&M University; 2004. Available from: http://hdl.handle.net/1969.1/440

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Texas A&M University

29. Chae, Junjae. Concurrent design of facility layout and flow-based department formation.

Degree: 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)

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 (6^th Edition):

Chae, J. (2005). Concurrent design of facility layout and flow-based department formation. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/1606

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Chae, Junjae. “Concurrent design of facility layout and flow-based department formation.” 2005. Thesis, Texas A&M University. Accessed December 05, 2019. http://hdl.handle.net/1969.1/1606.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Chae, Junjae. “Concurrent design of facility layout and flow-based department formation.” 2005. Web. 05 Dec 2019.

Vancouver:

Chae J. Concurrent design of facility layout and flow-based department formation. [Internet] [Thesis]. Texas A&M University; 2005. [cited 2019 Dec 05]. Available from: http://hdl.handle.net/1969.1/1606.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Chae J. Concurrent design of facility layout and flow-based department formation. [Thesis]. Texas A&M University; 2005. Available from: http://hdl.handle.net/1969.1/1606

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Texas A&M University

30. Pandey, Pankaj. A CMOS 500MHz continuous-time fourth order 0.05degree equiripple linear phase filter with automatic tuning.

Degree: 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)

Subjects/Keywords: Linear; Phase; Tuning; Filter

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Pandey, P. (2004). A CMOS 500MHz continuous-time fourth order 0.05degree equiripple linear phase filter with automatic tuning. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/68

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Pandey, Pankaj. “A CMOS 500MHz continuous-time fourth order 0.05degree equiripple linear phase filter with automatic tuning.” 2004. Thesis, Texas A&M University. Accessed December 05, 2019. http://hdl.handle.net/1969.1/68.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Pandey, Pankaj. “A CMOS 500MHz continuous-time fourth order 0.05degree equiripple linear phase filter with automatic tuning.” 2004. Web. 05 Dec 2019.

Vancouver:

Pandey P. A CMOS 500MHz continuous-time fourth order 0.05degree equiripple linear phase filter with automatic tuning. [Internet] [Thesis]. Texas A&M University; 2004. [cited 2019 Dec 05]. Available from: http://hdl.handle.net/1969.1/68.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Pandey P. A CMOS 500MHz continuous-time fourth order 0.05degree equiripple linear phase filter with automatic tuning. [Thesis]. Texas A&M University; 2004. Available from: http://hdl.handle.net/1969.1/68

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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Open Access Theses and Dissertations