6,561 research outputs found
Polymer multimode waveguide optical and electronic PCB manufacturing
No full textThe paper describes the research in the £1.3 million IeMRC Integrated Optical and Electronic Interconnect PCB Manufacturing (OPCB) Flagship Project in which 8 companies and 3 universities carry out collaborative research and which was formed and is technically led by the author. The consortium’s research is aimed at investigating a range of fabrication techniques, some established and some novel, for fabricating polymer multimode waveguides from several polymers, some formulations of which are being developed within the project. The challenge is to develop low cost waveguide manufacturing techniques compatible with commercial PCB manufacturing and to reduce their alignment cost. The project aims to take the first steps in making this hybrid optical waveguide and electrical copper track printed circuit board disruptive technology widely available by establishing and incorporating waveguide design rules into commercial PCB layout software and transferring the technology for fabricating such boards to a commercial PCB manufacturer. To focus the research the project is designing an optical waveguide backplane to tight realistic constraints, using commercial layout software with the new optical design rules, for a demonstrator into which 4 daughter cards are plugged, each carrying an aggregate of 80 Gb/s data so that each waveguide carries 10 Gb/s
Regularization Paths for Cox's Proportional Hazards Model via Coordinate Descent
No full textWe introduce a pathwise algorithm for the Cox proportional hazards model, regularized by convex combinations of l_1 and l_2 penalties (elastic net). Our algorithm fits via cyclical coordinate descent, and employs warm starts to find a solution along a regularization path. We demonstrate the efficacy of our algorithm on real and simulated data sets, and find considerable speedup between our algorithm and competing methods.
Interview with Mark Cox
No full textMark Cox is a professor of Creative Writing at UNCW, and has served as Chair of the department. He is the author of three full-length poetry collections: Smoulder, Thirty-Seven Years from the Stone, and Natural Causes
An Arbitrage Approach to the Pricing of Catastrophe Options Involving the Cox Process
No full textWe investigate the valuation and hedging of catastrophe options, whose claim arrival process is modeled by the Cox process or a doubly stochastic Poisson process. Employing the non-arbitrage principle we obtain closed form formula for the pricing of the option. Various hedging parameters are also computed.catastrophe options, Cox process, pricing
On Campus Video, featuring Abilene (TX) businessman and author Jack Cox.
No full textA videorecording of an interview with Abilene (TX) businessman and author Jack Cox, conducted by Dr. Gary McCaleb of Abilene Christian University
Concentration in Knowledge Output: A case of Economics Journals
No full textThis paper assesses the degree of author concentration in seven economics journals, which were published in India during 1990-2002. To measure the degree of author concentration, Lotka's Law was used. Moreover, we also make an exploratory analysis of the geographic, economics subfield and institutional concentration in 704 economics journals. An important finding of this paper is that specialized journals in the sample report the highest degree of author concentration. This result is quite similar to the findings by Cox and Chung (1991). Furthermore, there are several instances showing that the journals lean towards certain norms; this may affect the flow of innovative ideas into economics. We conclude that a knowledge activity, involving the high degree of concentration and a biased publication process, may affect the flow of new ideas into the discipline.Concentration, Lotka's Law
Implementation of complex interactions in a Cox regression framework
No full textThe standard Cox proportional hazards model has been extended by functionally describable interaction terms. The first of which are related to neural networks by adopting the idea of transforming sums of weighted covariables by means of a logistic function. A class of reasonable weight combinations within the logistic transformation is described. Apart from the standard covariable product interaction, a product of logistically transformed covariables has also been included in the analysis of performance of the new terms. An algorithm combining likelihood ratio tests and AIC criterion has been defined for model choice. The critical values of the likelihood ratio test statistics had to be corrected in order to guarantee a maximum type I error of 5% for each interaction term. The new class of interaction terms allows interpretation of functional relationships between covariables with more flexibility and can easily be implemented in standard software packages
Mary Ann Cox Index: Royal Society Collection
No full textBurton-Wood: in a series of letters, by a lady (Mrs. - Cox nee Wight), London (printed for the author by H.D.Steel) 1783, vol.11
(octovo vol, leather bound)
Enclosed: note The book Burtonwood was written by the mother of
Mary Ann Cox who ran the first coach from Hobart to Launceston.
It was passed on to me by her grand-daughter Miss Dora Clerk of Malahide.
I also am a grand-daughter of Mrs. Cox. Joan Harvey
(John Edward Cox m. Mary Ann Halls
V.D.L. 1821 J.E.C. started Hobart-Launceston coach) - (note - Mrs.
Harvey's identification of the author of the volume was based on family
tradition although not confirmed - no details are known of John Edward
Cox's parents)
Poems by C(harles) Best c 1847 - 1849
Includes poems to Miss Wilmot (Georgiana Wilmot, - Mrs. C. Butler)
and Mary Wilmot.
Enclosed: note by Joan Harvey
Article on Mrs. Mary Ann Cox 1950.
A pioneer career woman (on coach service between Hobart - Launceston)
from "Woman's Day" Aug. 21, 1950 (news clipping)
R.S. 14
Reflections on fourteen cryptic issues concerning the nature of statistical inference
No full textThe present paper provides the original formulation and a joint response of a group of statistically trained scientists to fourteen cryptic issues for discussion, which were handed out to the public by Professor Dr. D.R. Cox after his Bernoulli Lecture 1997 at Groningen University.</p
Tomographic inversion of focusing operators
No full textSeismic images of the structure of the earth are a prerequisite for finding new hydrocarbon reservoirs. The quality of a seismic images is highly dependent on the accuracy of the velocity model of the subsurface. Conventional imaging consists of an iterative process between obtaining the image using a velocity model, and updating this model by investigating the properties of the image. The Common Focal Point (CFP) method makes it possible to analyze and treat seismic data in a fundamentally different way as it uses a two-step approach: 1) two-way reflection data are transformed into one-way data by estimating focusing operators, and 2) these focusing operators are used to estimate the velocity model by tomographic inversion. This second step, the tomographic inversion of focusing operators, is the subject of this thesis. This research contains two important new aspects. First, the use of focusing operators in (3D) velocity model estimation. Second the data-driven approach of the method. Some additional concepts like the inclusion of a priori information, the joint inversion of P and S-wave operators, and the new concept of the focal point clouds, by which the adequacy of the velocity model can be analyzed, are also addressed. After evaluation of the method of tomographic inversion of focusing operators on both synthetic and real data it can be concluded that the method results in accurate velocity models and is capable of dealing with complex subsurface models.Applied Science
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