Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 13 of 13 for “"Fractional factorial designs."”.
-
The performance of orthogonal arrays with adjoined or unavailable runs
Orthogonal arrays are a class of fractional factorial designs that are optimal according to a range of optimality criteria. This makes it tempting to construct fractional factorial designs by adjoining additional runs to an OA, or by removing runs from an OA, when the number of runs available for …
-
Analyzing Unreplicated Two Level Factorial Designs
… often used in analyzing unreplicated two level factorial and fractional factorial designs. Typically no objective method is used with these plots for assessing if a plotted point is associated with a nonzero effect. Firstly, we provide an analysis of the plotting positions used in constructing …
-
Sequential optimization through adaptive design of experiments
… and compare its performance to saturated fractional factorial designs. The rationale for adopting the adaptive OFAT design scheme become clear if it is imbedded in a Bayesian framework: it becomes clear that OFAT is an efficient response to step by step accrual of sample information. The …
-
Measurement Error in Designed Experiments for Second Order Models
… in the planning and analysis of experimental designs. A familiar model for this type of ME, called the Berkson error model, is discussed at length. Previous research has examined the effect of Berkson error on two-level factorial and fractional factorial designs. This dissertation extends the …
-
Ensembles of Adaptive One-Factor at-a-Time experiments : methods, evaluation, and theory
… namely a single orthogonal array (full and fractional factorial designs), which is equally resource intensive. Comparisons between the two experimental algorithms are conducted using a hierarchical probability meta-model (HPM) and an illustrative case study. The case is a wet clutch system …
-
Separation of Recombinant β-Glucuronidase from Transgenic Tobacco by Aqueous Two-Phase Extraction
… amounts of impurities from the initial extract. Fractional factorial designs and response surface methodology were used to determine an optimized aqueous two-phase system for the purification of rGUS from transgenic tobacco. In a 13.4 % (w/w) PEG/18% (w/w) potassium phosphate system, 74% of the …
-
Lysozyme Separation from Tobacco Extract by Aqueous Two-Phase Extraction
… protein and lysozyme, respectively. Two level fractional factorial designs were used to study the effects of factors such as PEG molecular weight, PEG concentration, the concentration of phase forming salt, sodium chloride concentration, and pH on protein partitioning. The results showed that …
-
Construction and Analysis of Linear Trend-Free Factorial Designs Under a General Cost Structure
… the effects of such a trend. The resulting designs are referred to as trend-free designs. We consider here, in particular, linear trend-free designs for factorial treatment structures such that estimates of main effects and two-factor interactions are trend-free. In addition to …
-
Properties of some minimum run resolution IV designs
The regular resolution TV fractional factorial designs described in the have many desirable properties; main effect estimates are uncorrelated and are unbiased by two-factor interactions, whilst estimates of the two-factor interaction effects are limited to the identification of a significant …
-
OPTIMALITY OF CHEMICAL BALANCE WEIGHING DESIGNS.
… arises from the statistical problems of weighing designs, certain block designs and 2('n) fractional factorial designs. The well-known D-, A- and E-optimality criteria are obtained by taking (PHI)(X('T)X) = det(X('T)X)('-1), tr(X('T)X)('-1) and the maximum of the eigenvalue of (X('T)X)('-1) …
-
Optimal experimental designs for estimating the slope of a response surface
… the most part these criteria have led to optimal designs for predicting response. In many applications of response surface methodology, however, the primary experimental objective can best be fulfilled by estimating the slope of the response surface. This would be the case, for example, in …
-
Sensitivity analysis on the reliability and durability of the cylinder head to different engine parameters
… for the processing input definition. Generally fractional factorial designs like Orthogonal arrays are used for the trial run planning. As engine parameters of interest to be varied all the ones that by experience are able to influence the lifetime of the Cylinder Head are typically selected . …
-
Planeamento de experiências e controlo de qualidade na indústria : revisão e aplicação metodológica
… preconizado, aplicou-se a técnica de planeamento factorial completo 2k para a identificação dos principais factores que influenciam o processo de produção. De entre os diferentes factores que envolvem o processo, destacam-se a velocidade, a pressão, a temperatura, o tempo e a quantidade. …