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.
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Showing 1 to 20 of 26 for “"two stage design"”.
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Bayesian Two Stage Design Under Model Uncertainty
Traditional single stage design optimality procedures can be used to efficiently generate data for an assumed model y = f(x<sup>(m)</sup>,b) + ε. The model assumptions include the form of f, the set of regressors, x<sup>(m)</sup> , and the distribution of ε. The nature of the response, y, often …
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A two-stage design framework for optimal spatial packaging of interconnected fluid-thermal systems
… limiting system sophistication and extending design timelines. Spatial packaging involves packing and routing, which are separately challenging NP-hard problems. Therefore, solving the coupled packing and routing (PR) problem simultaneously will require disruptive methods to better address …
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Variable Ratio Matrix Transformer based LLC Converter for Two-Stage Low-Voltage DC-DC Converter Efficiency Improvement
… Three challenges exist in the LDC design: (1) wide regulation range; (2) high output current; (3) thermal management. The single stage solutions, such as phase-shift full-bridge converter and LLC resonant converter, have been widely studied in the past. A matrix transformer is …
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Prevalence of psychiatric morbidity in the adult population of Mamre : an empirical and methodological investigation
… (SRQ) (Harding et al., 1980) as a first-stage screen in a community sample in the South African context. The general population of Mamre, a "coloured" community of approximately 5000 and presently undergoing transition from rural to urban status, was selected for study as there was an …
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Simulation of Coal Gasification Process Inside a Two-Stage Gasifier
… of coal gasification process inside a generic two-stage entrained-flow gasifier to produce syngas carbon monoxide and hydrogen. The simulations are conducted using the commercial Computational Fluid Dynamics (CFD) solver FLUENT. The 3-D Navier-Stokes equations and seven species transport …
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Network lifetime extension, power conservation and interference suppression for next generation mobile wireless networks
Two major focus research areas related to the design of the next generation multihop wireless networks are network lifetime extension and interference suppression. In this dissertation, these two issues are addressed. In the area of interference suppression, a new family of projection multiuser …
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Bayesian D-Optimal Design for Generalized Linear Models
Bayesian optimal designs have received increasing attention in recent years, especially in biomedical and clinical trials. Bayesian design procedures can utilize the available prior information of the unknown parameters so that a better design can be achieved. However, a difficulty in dealing with …
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Bayesian sample-size determination and adaptive design for clinical trials with Poisson outcomes.
… for a parameter of interest or need to adaptive design elements during the course of the trial based on information that is initially unknown. Although most experimenters have employed frequentist methods, the Bayesian paradigm offers a wide variety of methodologies and are becoming increasingly …
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Item parameter drift and online calibration
… detect drifted items, and most of the them were designed to detect drifts in the unidimensional item response model under the paper and pencil testing framework, which may not be adequate for computerized adaptive testing. This paper introduces an online (re)calibration design to detect item …
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Short-term traffic forecasting for a smart satellite communications system
… model using Long- Short Term Memory neural networks (LSTM) or Gated Recurrent Unit neural networks (GRU) to forecast terminal traffic. Each algorithm was tuned using a two-stage design of experiments process consisting of a fractional screening design to identify impactful hyper-parameters and …
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Experimental design issues in impaired reproduction applications
… and more common, yet methods for efficiently designing experiments for these studies have received little attention. In this research, response surface design criteria are applied to four models for impaired reproduction data. The important role of control observations in impairment studies is …
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Optimal one and two-stage designs for the logistic regression model
… regression model, a well known nonlinear model. Designing an optimal experiment for this nonlinear situation poses some problems not encountered with a linear model. The application of several optimality design criteria to the logistic regression model is explored, and many resulting optimal …
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Implementation of Optimal Design for Item Calibration in Computerized Adaptive Testing (Cat)
… by implementing a promising method, optimal design. Contrary to traditional random item selection, optimal design matches examinees and pretest items for maximal information on item parameters according to certain optimal design criterion. For example, in L-optimal design, item selection is …
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The Role of Parenting in the Development of Rumination
… called the Five Minute Speech Sample (FMSS). Design A cross-sectional two-stage design was utilised. During stage one, sixth-form girls and their mothers were invited to complete questionnaires measuring rumination and affect. At stage two, mothers of high rumination and low rumination …
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A study of micromachined displacement pumps for vacuum generation
… rough pump. The micro displacement pump is designed with the aid of analytical and numerical modeling. The rough pump is fabricated by deep-reactive ion etching and other standard micromachining techniques. Systematic study into operation of this class of pumps allows us to now report on a …
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Quality of Life: Socio-Demographic and Genetic Determinants As Well As Links With Cancer Outcomes
… with bladder cancer mortality. Using a two-stage design (discovery and independent validation), we identified several single nucleotide polymorphisms (SNPs) that was associated with recurrence or progression in non-muscle invasive bladder cancer overall or stratified by treatment.</p> …
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Nutrition and social scale: the impact of social differentiation on dietary intake
… three strata, and selecting random samples in a two-stage design, was employed. The logic of the design proceeds from the assumption that the strata correspond to three different social changes that have happened to them. These social changes that have occurred in varied ways are the principal …
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Phase II Trials Powered to Detect Activity in Tumor Subsets with Retrospective (or Prospective) Use of Predictive Markers
Classical phase II trial designs assume a patient population with a homogeneous tumor type and yield an estimate of a stochastic probability of tumor response. Clinically, however, oncology is moving towards identifying patients who are likely to respond to therapy using tumor subtyping based upon …
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Language Policy and Mandarin Investment of Tertiary Chinese Heritage Language Learners from Dialect Backgrounds in New Zealand
… both Mandarin and dialects. This study is a two-stage design. Stage 1 collected questionnaires from 56 dialect-background CHL learners from a university Mandarin programme. It depicted a quantitative image of this student body regarding their demographic backgrounds, language proficiency, and …
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Fault-Tolerant Control of Unmanned Underwater Vehicles
… the fault occurrence. The HFDIC also includes a two-stage design of parallel Kalman filters in levels two and three for fault identification using the multiple-model adaptive estimation (MMAE). The algorithm activates latter levels only when the failure is detected, and can return back to the …
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