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Search Results: 1 - 10 of 8219 matches for " Walter Cook "
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Investor Na?veté and Asset Prices  [PDF]
Jonathan Cook
Journal of Mathematical Finance (JMF) , 2013, DOI: 10.4236/jmf.2013.34047
Abstract:

This paper describes strategic behavior in a nonequilibrium model of asset pricing with heterogeneous sophistication. Both risk and return are increasing in the na?veté of investors in the market. Optimal investment involves in considering the effect that na?e investors have on the market. Further, we derive a simple characterization of the asset price dynamics that results from an arbitrary combination of a countably infinite set of investor types.

Restoring Washed Out Bridges so ELearners Arrive at Online Course Destinations Successfully  [PDF]
Ruth Gannon Cook
Creative Education (CE) , 2012, DOI: 10.4236/ce.2012.34083
Abstract: This study researched the impact of strategic navigation improvements in an online course selected for the study over one quarter (12 weeks) at a large Midwestern private university. The primary purpose of the study was to see if navigation enhancements and specific graphic enhancements (semiotic tools) in the online course selected for the study could make it easier for adult students to learn new course materials. The study also sought to see if these factors could contribute to increased positive learning experiences and to see whether there might be a higher percentage of completion rates in this enhanced online course than in other online courses at the university. While not generalizable, the findings could provide inferences about which factors could positively influence adult learning in online courses and contribute to increased course completion rates; the study could also provide recommendations on graphic enhancements and online course navigation that positively influence student learning in online courses.
The Worldwide Abalone Industry  [PDF]
Peter A. Cook
Modern Economy (ME) , 2014, DOI: 10.4236/me.2014.513110
Abstract: Global fish production continues to outpace world population growth, and aquaculture remains one of the fastest-growing food producing sectors. In 2012, global aquaculture production was 90.4 million tonnes. Although, in terms of production tonnage, abalone contributes a relatively small proportion of this aquaculture production, it is one of the most highly prized seafood delicacies and, therefore, in terms of the value of production, is very important to many countries. The total volume of worldwide abalone fisheries has declined since the 1970’s, but farm production has increased significantly over the past few years. A huge increase in farm production has occurred, beginning in the 1970s, when farm production was almost negligible, to recent years when increases have been huge. In the 8 years immediately preceding 2010, for example, farm production increased by more than 750% and by 2013, farm production had reached an estimated 103,464 mt. The overall effects of these huge increases on the world market are discussed.
UGT1A1 sequence variants and bilirubin levels in early postnatal life: a quantitative approach
Neil A Hanchard, Jennifer Skierka, Amy Weaver, Brad S Karon, Dietrich Matern, Walter Cook, Dennis J O'Kane
BMC Medical Genetics , 2011, DOI: 10.1186/1471-2350-12-57
Abstract: We sequenced the exons, PBREM, 5'-, and 3'- regions of the UGT1A1 gene in 80 otherwise healthy term neonates who had repeat bilirubin levels measured within the first five days of life.Three novel coding variants were observed, but there was no clear relationship between rare coding variants and bilirubin rise. Adjusted linear regression models fit to evaluate the relationship between changing bilirubin levels and common UGT1A1variants found that among 39 neonates whose bilirubin was resampled within 33 hours, individuals homozygous for the mutant allele of a 3'UTR SNP had significantly smaller changes in bilirubin (P = 0.003) than individuals carrying the wild-type allele.Collectively, rare UGT1A1 coding variants do not appear to play a prominent role in determining early bilirubin levels; however common variants in the 3' UTR of UGT1A1 may modulate the early bilirubin rise. A quantitative approach to evaluating early bilirubin kinetics provides a more robust framework in which to better understand the genetics of neonatal hyperbilirubinemia.Neonatal hyperbilirubinemia affects 60% of full-term newborns and remains a significant cause of hospital re-admission in the first week of life [1,2]. With most newborns being discharged from hospital at 48 hours of life - a time when serum unconjugated bilirubin levels are still rising - the American Academy of Pediatrics has placed more emphasis on identifying infants at increased risk of developing significant hyperbilirubinemia [3]. These infants require closer follow-up to stave off the potentially devastating neurological effects of bilirubin encephalopathy.In practice, an otherwise healthy term newborn's risk for developing severe 'physiological' hyperbilirubinemia is largely a function of their bilirubin level at discharge. Bilirubin, when plotted on an hour-specific nomogram, often directs the need for future evaluation [4-6]. Among those identified as being at high or high-intermediate risk at discharge, however, onl
Properties of Pt Schottky Type Contacts On High-Resistivity CdZnTe Detectors
Aleksey E. Bolotnikov,Steven E. Boggs,C. M. Hubert Chen,Walter R. Cook,Fiona A. Harrison,Stephen M. Schindler
Physics , 2001, DOI: 10.1016/S0168-9002(01)01506-6
Abstract: In this paper we present studies of the I-V characteristics of CdZnTe detectors with Pt contacts fabricated from high-resistivity single crystals grown by the high-pressure Brigman process. We have analyzed the experimental I-V curves using a model that approximates the CZT detector as a system consisting of a reversed Schottky contact in series with the bulk resistance. Least square fits to the experimental data yield 0.78-0.79 eV for the Pt-CZT Schottky barrier height, and <20 V for the voltage required to deplete a 2 mm thick CZT detector. We demonstrate that at high bias the thermionic current over the Schottky barrier, the height of which is reduced due to an interfacial layer between the contact and CZT material, controls the leakage current of the detectors. In many cases the dark current is not determined by the resistivity of the bulk material, but rather the properties of the contacts; namely by the interfacial layer between the contact and CZT material.
Effects of Bulk and Surface Conductivity on the Performance of CdZnTe Pixel Detectors
Aleksey E. Bolotnikov,C. M. Hubert Chen,Walter R. Cook,Fiona A. Harrison,Irfan Kuvvetli,Stephen M. Schindler
Physics , 2001, DOI: 10.1109/TNS.2002.801673
Abstract: We studied the effects of bulk and surface conductivity on the performance of high-resistivity CdZnTe (CZT) pixel detectors with Pt contacts. We emphasize the difference in mechanisms of the bulk and surface conductivity as indicated by their different temperature behaviors. In addition, the existence of a thin (10-100 A) oxide layer on the surface of CZT, formed during the fabrication process, affects both bulk and surface leakage currents. We demonstrate that the measured I-V dependencies of bulk current can be explained by considering the CZT detector as a metal-semiconductor-metal system with two back-to-back Schottky-barrier contacts. The high surface leakage current is apparently due to the presence of a low-resistivity surface layer that has characteristics which differ considerably from those of the bulk material. This surface layer has a profound effect on the charge collection efficiency in detectors with multi-contact geometry; some fraction of the electric field lines originated on the cathode intersects the surface areas between the pixel contacts where the charge produced by an ionizing particle gets trapped. To overcome this effect we place a grid of thin electrodes between the pixel contacts; when the grid is negatively biased, the strong electric field in the gaps between the pixels forces the electrons landing on the surface to move toward the contacts, preventing the charge loss. We have investigated these effects by using CZT pixel detectors indium bump bonded to a custom-built VLSI readout chip.
Increasing Positive Perceptions of Diversity for Religious Conservative Students  [PDF]
Alison Cook, Ronda Roberts Callister
Creative Education (CE) , 2010, DOI: 10.4236/ce.2010.12014
Abstract: Evidence suggests that positive perceptions toward diversity enhance the potential group and organizational benefits resulting from diversity. Given the make-up of today’s organizations, encountering diversity has become the norm ra-ther than the exception. As such, it is becoming increasingly important to address diversity issues, and take steps to increase positive perceptions of diversity within the business classroom in order to carry that advantage into the workplace. Religious conservative students present a unique challenge to diversity education in that they likely hold value- laden attitudes that lack alignment with diversity principles. This study prescribes a scaffolding approach to increase positive perceptions of diversity within a classroom comprised predominantly of religious conservative students
Measurement Error for Age of Onset in Prevalent Cohort Studies  [PDF]
Yujie Zhong, Richard J. Cook
Applied Mathematics (AM) , 2014, DOI: 10.4236/am.2014.511160
Abstract:

Prevalent cohort studies involve screening a sample of individuals from a population for disease, recruiting affected individuals, and prospectively following the cohort of individuals to record the occurrence of disease-related complications or death. This design features a response-biased sampling scheme since individuals living a long time with the disease are preferentially sampled, so naive analysis of the time from disease onset to death will over-estimate survival probabilities. Unconditional and conditional analyses of the resulting data can yield consistent estimates of the survival distribution subject to the validity of their respective model assumptions. The time of disease onset is retrospectively reported by sampled individuals, however, this is often associated with measurement error. In this article we present a framework for studying the effect of measurement error in disease onset times in prevalent cohort studies, report on empirical studies of the effect in each framework of analysis, and describe likelihood-based methods to address such a measurement error.

Unit root testing in the presence of innovation variance breaks: a simple solution with increased power
Steven Cook
Journal of Applied Mathematics , 2002, DOI: 10.1155/s1110757x02107029
Abstract: The Dickey-Fuller unit root test is known to suffer severe oversizing in the presence of innovation variance breaks. In this paper, forward and reverse Dickey-Fuller regressions are proposed as a means of correcting this size distortion. The results of Monte Carlo experimentation show such an approach to result in both satisfactory size properties and increased power relative to previously suggested solutions.
Ethics as Our Guide
Michael Cook
PLOS Biology , 2012, DOI: 10.1371/journal.pbio.0020170
Abstract:
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