BACKGROUND A variety of sociodemographic factors, such as gender, age, household income, and educational level, influence individuals' likelihood of smoking. Work-related factors may also be linked to smoking behavior. We sought to investigate the relationship between smoking and work environment in South Korea. METHODS We analyzed data from the Fifth Korean National Health and Nutrition Exam...

The objective of this study was to evaluate whether long-term shift work is associated with both the total hormonal secretion after awakening and the pattern of the cortisol levels during the first hour following awakening, among 65 randomly selected police officers who represent a high stress occupation. Dominant shift (Day, Afternoon, or Midnight) was ascertained using daily payroll records o...

Moderate e ects of pollution on health may exert an important in uence on labor market decisions. We exploit exogenous variation in pollution due to the closure of a large re nery in Mexico City to understand how pollution impacts labor supply. The closure led to an 8 percent decline in pollution in the surrounding neighborhoods. We nd that a one percent increase in sulfur dioxide results in a ...

A detailed analysis was made of individual agency practices, and of average across agencies, in weekly instructional hours and student work hours attributed to the Level II fieldwork program during one 12-week assignment. The study is based upon data collected on daily log sheets from students and agency staff and related to their activities for instruction and agency work for that period. Ques...

This paper finds and analyzes a formula for the total variation distance between iterations of riffle shuffles and iterations of “cut and then riffle shuffle”. This allows one to obtain information about the convergence rate of permutation statistics (such as the length of the longest increasing subsequence or position of a given card) under these processes. Similar results are given for affine...

Abstract. We compute the limit distribution for (centered and scaled) length of the longest increasing subsequence of random colored permutations. The limit distribution function is a power of that for usual random permutations computed recently by Baik, Deift, and Johansson (math.CO/9810105). In two–colored case our method provides a different proof of a similar result by Tracy and Widom about...