Quantitative posture analysis of 2D, 3D, and optical microscope visualization methods for microsurgery tasks

The purpose of this paper is to present a quantitative posture analysis of microsurgery tasks performed with different visualization methods. Microsurgery is traditionally performed using a binocular microscope; however surgeons are constrained by the optical eyepieces and are forced to assume joint angles that deviate away from neutral postures. This may be especially problematic for the neck and can increase surgeon discomfort and fatigue. Alternative visualization methods may improve surgeon posture by eliminating the constraints imposed by the microscope. This study examines both 2D and 3D heads-up displays as possible alternatives. Six subjects performed microsurgical tasks with each visualization methods for four hours. Quantitative posture analysis was done using Maxtraq software that tracks reflective markers on the subjects. The initial analysis of neck, upper arm, and elbow angles found significant differences between each display. A biomechanical analysis found that the differences in angles can result in loads on the neck joint that are twice as high in the microscope than the headsup displays. Although the alternative displays can result in better postures, improvements the display technology is needed to improve microsurgical task performance.     

The development of a universal approach to testing of walkway slip resistance in the U.S

The measurement of walkway slip resistance is required to assess the risk of slipping. Unlike other countries, the U.S. has not decided upon a single approach to the measurement of slip resistance. Several types of tribometers are available to measure slip resistance however, the measured value of the slip resistance of a given surface has been found to be tribometer specific. The introduction of ASTM International Standard F2508 Standard Practice for Validation and Calibration of Walkway Tribometers Using Reference Surfaces, has produced a method which allows validation of each type of tribometer and the values generated during testing.     

Son Preference and Access to Social Insurance: Evidence from China's Rural Pension Program

Many scholars argue that the persistence of son preference in China is driven by greater anticipated old‐age support from sons than from daughters and the absence of formal financial mechanisms for families to save for retirement. The introduction of a voluntary old‐age pension program in rural China in the 1990s presents the opportunity to examine (1) whether parents with sons are less likely to participate in pension plans and (2) whether providing access to pension plans affects parental sex‐selection decisions. Consistent with the first hypothesis, we find that parents with sons are less likely to participate in the pension program and have less financial savings for retirement. Consistent with the second hypothesis, we find that an increase in county‐level pension program availability is associated with a slower increase in the sex ratio at birth.     

The impact of immigration on child health: experimental evidence from a migration lottery program

This paper uses a unique survey designed by the authors to compare migrant children who enter New Zealand through a random ballot with children in the home country of Tonga whose families were unsuccessful participants in the same ballots. We find that migration increases height and reduces stunting of infants and toddlers, but also increases BMI and obesity among 3- to 5-yr-olds. These impacts are quite large even though the average migrant household has been in New Zealand for less than 1 yr. Additional results suggest that these impacts occur because of dietary change rather than direct income effects.     

The potential for international and transnational public service advertising in public spaces in American and Chinese global cities: Conclusions from a 2010 survey of advertisements in subways in Beijing,New York,Shanghai and Washington,DC

Can we construct transnational or international public service advertising to counterbalance the proliferation of transnational commercial advertising? As an important first step in exploring the possibility of such an application of shared media public diplomacy among nations, this paper describes a complete survey of commercial and public service advertisements collected from the public spaces of subway systems in American and Chinese cities in 2010 – New York, Washington, DC, Shanghai and Beijing – to reveal the range of themes of commercial and public service ads in these spaces. The study reveals first that analogous commercial and public service ads are ubiquitous in the public spaces of both Chinese and American cities. Second, many of the themes that might appear in international or transnational public service ads are already being portrayed in ads created by local or national governments or NGOs, although these themes are portrayed in ads created by different sets of actors in China and in the US: government actors and a few international NGOs in Chinese cities, and governments, corporations and non-profit organizations in the case of American cities. Finally, the survey reveals that in all four cities there are many commercial advertisements that appeal to the identity of a transnational consumer, but that there are almost no public service ads that appeal to the identity of a transnational citizen: merely local or national ones who can solve such public problems as global warming, education, and health issues.     

Exploring the relationship between experiential avoidance, alcohol use disorders, and alcohol-related problems among first-year college students

Abstract Objective: This study explored the relationship of experiential avoidance (eg, the tendency to avoid, suppress, or otherwise control internal experiences even when doing so causes behavioral harm) to alcohol use disorders and alcohol-related problems. Participants: Cross-sectional data were collected from 240 undergraduate college students in their first year in college between December 2009 and April 2010. Methods: Participants completed a diagnostic interview and online self-report survey. Results: Students with a history of alcohol abuse or dependence had significantly higher levels of experiential avoidance relative to students with no alcohol use disorder diagnosis. A hierarchical linear regression analysis found that experiential avoidance significantly predicted alcohol-related problems, even after controlling for gender and psychological distress. Furthermore, experiential avoidance mediated the relationship of psychological distress to alcohol-related problems. Conclusions: These findings suggest that experiential avoidance may play a role in problematic alcohol use among college students.     

Child-Focused Family Therapy: Behavioural Family Therapy Versus Brief Family Therapy

We examined the effectiveness of behavioural family therapy (following the treatment agenda outlined in Fleischman, Horne and Arthur, 1983) and brief family therapy (following the procedures outlined in Fisch, Weakland and Segal, 1985), in the treatment of child psychological disorders. The parents of the 49 children referred to the outpatient unit of a children's hospital completed the Child Behavior Checklist (CBCL) (Achenbach and Edelbrock, 1983). Three scales of the CBCL were examined to assess the effectiveness of the two therapeutic approaches pre- to post-treatment. Significant pre- and post-treatment differences were found for behavioural family therapy on the Internalizing, Externalizing, and Sum T scales and for brief family therapy on the Internalizing and Sum T scales. Sum T scales represent the sum of scores across all sub-scales of the CBCL. Neither treatment was found to be more effective than the other.     

Bayesian variable selection for proportional hazards models

The authors consider the problem of Bayesian variable selection for proportional hazards regression models with right censored data. They propose a semi-parametric approach in which a nonparametric prior is specified for the baseline hazard rate and a fully parametric prior is specified for the regression coefficients. For the baseline hazard, they use a discrete gamma process prior, and for the regression coefficients and the model space, they propose a semi-automatic parametric informative prior specification that focuses on the observables rather than the parameters. To implement the methodology, they propose a Markov chain Monte Carlo method to compute the posterior model probabilities. Examples using simulated and real data are given to demonstrate the methodology.     

Civilizing Northumberland: Representations of Englishness in the Tudor State

Taking Northumberland as a case study, this paper explores the wider implications of the Tudor strategy of reform by centralization, uniformity, and cultural imperialism. It reappraises the notion that the growth of centralized government at the expense of regional magnates was unambiguously a form of modernization; and argues that the essential character of the Tudor state and the radical nature of Tudor reform have been obscured by the historians' practice of viewing developments in terms of the rise of the nation.     

The Effect of School Choice on Participants: Evidence from Randomized Lotteries

School choice has become an increasingly prominent strategy for enhancing academic achievement. To evaluate the impact on participants, we exploit randomized lotteries that determine high school admission in the Chicago Public Schools. Compared to those students who lose lotteries, students who win attend high schools that are better in a number of dimensions, including peer achievement and attainment levels. Nonetheless, we find little evidence that winning a lottery provides any systematic benefit across a wide variety of traditional academic measures. Lottery winners do, however, experience improvements on a subset of nontraditional outcome measures, such as self‐reported disciplinary incidents and arrest rates.