Dataflow computers: a tutorial and survey

Journal ArticleThe demand for very high performance computer has encouraged some researchers in the computer science field to consider alternatives to the conventional notions of program and computer organization. The dataflow computer is one attempt to form a new collection of consistent systems ideas to improve both computer performance and to alleviate the software design problems induced by the construction of highly concurrent programs

The market for pediatric surgeons: An updated survey of recent graduates

Purpose: The aim of this study was to identify the demand for pediatric surgeons as perceived by recent graduates of North American pediatric surgery training programs. Methods: A survey was mailed to every pediatric surgeon who completed a certified training program in North America between 1998 and 2000; 81% of 83 responded. Data from the previous survey of 1992 through 1997 graduates provided longitudinal comparisons. The data were analyzed using univariate and bivariate statistical analysis. Results: The number of graduates was 28, 31, and 24 for 1998, 1999, and 2000, respectively, down from 35 graduates in 1997. All found positions in pediatric surgery, and first-year incomes continue to rise. Fewer graduates (54%) desired an academic position coupled with research compared with previous survey respondents (64%), and 69% were able to find such a position, A practice at a university children\u27s hospital remained the most desired by over 80%, but only 38% obtained positions in this type of practice, However, 55% were able to find a position in a children\u27s hospital (university or community), which had declined gradually to a low of 32% in 1997. The 1998 to 2000 graduates perceive a much stronger demand for pediatric surgeons compared with previous survey respondents (46% v 14%), and greater than 50% felt that too few pediatric surgeons were being trained. Conclusions: The market demand for pediatric surgeons remains strong as measured by employment and income. The perception of the market bythe 1998 through 2000 graduates is positive, which contrasts with the 1992 through 1997 graduates. However, there continues to be significant market changes including a proliferation of positions at community Children\u27s hospitals. Copyright 2003, Elsevier Science (USA). All rights reserved

Increasing prevalence of gastroschisis in Europe 1980û2002: a phenomenon restricted to younger mothers?

Gastroschisis is an abdominal wall defect more prevalent in offspring of young mothers. It is known to be increasing in prevalence despite the general decrease in the proportion of births to young European women. We investigated whether the increase in prevalence was restricted to the high-risk younger mothers. We analysed 936 cases of gastroschisis from 25 population-based registries in 15 European countries, 1980-2002. We fitted a Bayesian Hierarchical Model which allowed us to estimate trend, to estimate which registries were significantly different from the common distribution, and to adjust simultaneously for maternal age, time (in grouped years) and the random variation between registries. The maternal age-standardised prevalence (standardised to the year 2000 European maternal age structure) increased almost fourfold from 0.54 [95% Credible Interval (CrI) 0.37, 0.75] per 10,000 births in 1980-84 to 2.12 [95% CrI 1.85, 2.40] per 10,000 births in 2000-02. The relative risk of gastroschisis for mothers <20 years of age in 1995-2002 was 7.0 [95% CrI 5.6, 8.7]. There were geographical differences within Europe, with higher rates of gastroschisis in the UK, and lower rates in Italy after adjusting for maternal age. After standardising for regional variation, our results showed that the increase in risk over time was the same for mothers of all ages--the increase for mothers <20 years was 3.96-fold compared with an increase of 3.95-fold for mothers in the other age groups. These findings indicate that the phenomenon of increasing gastroschisis prevalence is not restricted to younger mothers only