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Filtering by: Subject Libraries -- Quality control Remove constraint Subject: Libraries -- Quality control Degree Name Doctor of Philosophy (Ph.D.) Remove constraint Degree Name: Doctor of Philosophy (Ph.D.)

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  • Non-destructive evaluation of veneer using optical scanning and ultrasonic stress wave analysis systems

    Creator:
    DeVallance, David B.
    Abstract:
    Non-destructive commercial ultrasonic grading provides laminated veneer lumber (LVL) manufacturers a means for sorting veneer based on average ultrasonic propagation time (UPT) and/or average dynamic modulus of elasticity (MOEd). While this may provide reliable estimations of modulus of elasticity (MOE), little is known about the influence of veneer defects on...
    Resource Type:
    Dissertation

  • The effects of CI tools and implementation practices on hospital performance

    Creator:
    Holliday, John W.
    Abstract:
    Continuous Improvement (CI) is an integral part of hospital administration. This study examined the relationship between five CI variables against six hospital criterion measures of, wait times to prepare a room, patient costs per day, waiting time for lab results, reportable errors, patient satisfaction, and employee satisfaction. The research was...
    Resource Type:
    Dissertation
    Full Text:
    employing techniques to optimize cost while improving quality through process innovation and productivity

  • Multivariate control charts for nonconformities

    Creator:
    Chattinnawat, Wichai
    Abstract:
    When the nonconformities are independent, a multivariate control chart for nonconformities called a demerit control chart using a distribution approximation technique called an Edgeworth Expansion, is proposed. For a demerit control chart, an exact control limit can be obtained in special cases, but not in general. A proposed demerit control...
    Resource Type:
    Dissertation
    Full Text:
    been addressed in the literature. Pate! (1973) proposed a statistical quality control method for a

  • Probabilistic models for quality control in environmental sensor networks

    Creator:
    Dereszynski, Ethan W.
    Abstract:
    Networks of distributed, remote sensors are providing ecological scientists with a view of our environment that is unprecedented in detail. However, these networks are subject to harsh conditions, which lead to malfunctions in individual sensors and failures in network communications. This behavior manifests as corrupt or missing measurements in the...
    Resource Type:
    Dissertation
    Full Text:
    : Probabilistic Models for Quality Control in Environmental Sensor Networks Abstract approved: Thomas G

  • Determination of quality parameters for the Pacific whiting fishery using neural network and induction modeling

    Creator:
    Peters, Gregory J.
    Abstract:
    Pacific whiting, with a maximum sustainable yield between 150,000 and 250,000 metric tons, is the largest stock of fish found off Oregon. The majority of the fish are processed into surimi. Hundreds of variables could potentially affect surimi quality (gel strength). Alternative harvesting and processing input combinations, as well as...
    Resource Type:
    Dissertation
    Full Text:
    model for prediction and control of Pacific whiting quality. Neural Networks Neural networks are a

  • Comparison of response surface model and Taguchi methodology for robust design

    Creator:
    Sudasna-na-Ayudthya, Prapaisri
    Abstract:
    The principal objective of this study was to compare the results of a proposed method based upon the response surface model to the Taguchi method. To modify the Taguchi method, the proposed model was developed to encompass the following objectives. The first, with the exception of the Taguchi inner array,...
    Resource Type:
    Dissertation
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    authorities with respect to quality control issues, has drawn considerable atten- tion to an otherwise

  • Economically optimal control charts for two stage sampling

    Creator:
    Hall, Kathryn B.
    Abstract:
    Control charts are designed to monitor population parameters. Selection of a control chart sampling plan involves determination of the frequency of samples, size of each sample, and critical values to determine when the system is sending an out-of-control signal. Since the main use of control charts is in industry, a...
    Resource Type:
    Dissertation
    Full Text:
    Economically optimal control charts for two stage sampling

  • A Bayesian analysis for economic design of single sampling plans for a sequence of lots

    Creator:
    Taracena, Fernando L.
    Abstract:
    A dynamic approach to the Bayesian theory of sampling inspection by attributes for the single sampling case is presented. A model is developed which assumes a sequence of lots of equal known size and lots generated by a process operating in a random manner. The model also assumes constant associated...
    Resource Type:
    Dissertation
    Full Text:
    assumes constant associated costs for all lots and that the posterior distribution of the Process quality

  • Machine learning for improving the quality of citizen science data

    Creator:
    Yu, Jun
    Abstract:
    Citizen Science is a paradigm in which volunteers from the general public participate in scientific studies, often by performing data collection. This paradigm is especially useful if the scope of the study is too broad to be performed by a limited number of trained scientists. Although citizen scientists can contribute...
    Resource Type:
    Dissertation
    Full Text:
    birders to eBird. Next, we study the problem of building a data quality control model to filter out the