Image warping using radial basis functions

Image warping is the process of deforming an image through a transformation of its domain, which is typically a subset of R². Given the destination of a collection of points, the problem becomes one of finding a suitable smooth interpolation for the destinations of the remaining points of the domain. A common solution is to use the thin plate spline (TPS). We find that the TPS often introduces unintended distortions of image structures. In this paper, we will analyze interpolation by TPS, experiment with other radial basis functions, and suggest two alternative functions that provide better results.     

A Model Curriculum for Occupational Social Work

This paper reports the results of a survey experiment in which a national sample of NASW members was presented with systematically altered versions of a summary of a hypothetical study of casework effectiveness and asked to make judgments about the quality of the research, its importance to social work, and its significance for their own practice. It was found that although respondents distinguished between studies with good and bad research designs, their judgments of the quality of the research and its implications for their own practice were significantly influenced by whether the findings were positive or negative.     

The Phallus and the Person: Commentary on Paper by Taras Babiak

This discussion of Babiak's clinical account traces the macrotrajectory of Bart's therapeutic process toward broadly competent personhood rather than narrowly phallic compensation. The steps toward accomplishing this complex macrotransition are delineated in the microtrajectory of the “crunch” session between Babiak and Bart, during which Babiak traverses shock and challenge by introducing between them empathic recognition, evidence of mentalization, survival of boundaries and containing limits, down-regulation of raw affective urgency, “paternal” improvisation and a metaphorization of concrete action imperatives, interpretive linking, and a negotiation process that widened potential space for an eventual approach to intersubjectivity.     

Decisions to Make a Difference: The Role of Efficacy in Moderate Student Activism

Radical student protest has declined in the USA since the 1960s, but less militant forms of campus activism have continued to be a substantial part of larger social movement efforts. However, little research examines participation by today's youth in these moderate campus-based social movement organizations. This study addresses our lack of knowledge about less sensational forms of student activism with fieldwork and semi-structured interviews that illuminate the reasons for undergraduate participation in a student-led environmental group. The data show how school and employment considerations, career goals and social networks influence student decisions to join the organization. Moreover, the findings demonstrate the importance of organizational outcomes to participatory decisions. Students were led to actively participate according to their determination of the social movement organization's ability to achieve tangible goals and the perceived necessity of their contribution.     

A Sibling Death in the Family: Common and Consequential

Although a large literature analyzes the determinants of child mortality and suggests policy and medical interventions aimed at its reduction, there is little existing analysis illuminating the consequences of child mortality for other family members. In particular, there is little evidence exploring the consequences of experiencing the death of a sibling on one’s own development and transition to adulthood. This article examines the prevalence and consequences of experiencing a sibling death during one’s childhood using two U.S. data sets. We show that even in a rich developed country, these experiences are quite common, affecting between 5 % and 8 % of the children with one or more siblings in our two data sets. We then show that these experiences are associated with important reductions in years of schooling as well as a broad range of adult socioeconomic outcomes. Our findings also suggest that sisters are far more affected than brothers and that the cause of death is an important factor in sibling effects. Overall, our findings point to important previously unexamined consequences of child mortality, adding to the societal costs associated with childhood mortality as well as suggesting additional benefits from policy and medical innovations aimed at curbing both such deaths and subsequent effects on family members.     

Remeasuring ageing in Hong Kong SAR; or ‘keeping the demographic window open’

Hong Kong SAR has among both the lowest fertility rates and highest life expectancy in the world. Under the current calculation of the Old Age Dependency Ratio (OADR), Hong Kong is, understandably, ageing extremely rapidly. This is a cause of significant concern among policy makers. However, OADR assumes that the entire population aged above 65 is both ‘old’ and ‘dependent’, neither of which is clearly defined, and that all aged below 65 are active in the labour force. Furthermore, because the rate is fundamentally based upon a European/North American model of pension and retirement it is arguably less appropriate to areas of the world where retirement ages are more fluid and pension systems less developed. We apply and extend a method for Hong Kong, designed by Sanderson and Scherbov, to ‘remeasure ageing’ by taking remaining life expectancy as the constant, rather than years lived by using projected life tables and 1 × 1 population projections. In doing so, we show that Sanderson and Scherbov’s new ‘prospective’ measurements of ageing more accurately reflect the increased longevity and vitality of Hong Kong’s population. Rather than passively accepting fate as a ‘rapidly ageing’ population, East Asian economies can be active in rethinking society’s relationship to work and other activities across the life-cycle. By adapting existing measurements to take into account the different welfare regimes in East Asia, we can radically alter the timeframe in which population ageing becomes ‘critical’. This allows more time to develop a more holistic life-course view of the relationship between work, longevity and fertility and to actively tackle ageing in an optimistic way.     

The truncation-by-death problem: what to do in an experimental evaluation when the outcome is not always defined

Although experiments are viewed as the gold standard for evaluation, some of their benefits may be lost when, as is common, outcomes are not defined for some sample members. In evaluations of marriage interventions, for example, a key outcome--relationship quality--is undefined when a couple splits up. This article shows how treatment-control differences in mean outcomes can be misleading when outcomes are not defined for everyone and discusses ways to identify the seriousness of the problem. Potential solutions to the problem are described, including approaches that rely on simple treatment-control differences-in-means as well as more complex modeling approaches.     

Evaluating the benefits and costs of regulatory reforms: what questions need to be asked?

In 1984, Portney argued that "[w]e should scrutinize proposed reforms of the rulemaking process every bit as carefully as the regulations that process produces." In the 23 years since then, the regulatory process on the federal level has been continuously reformed by statute, by executive order, and by directives from the OMB. Despite the extensive debate on the need for these reforms, there has been very little analysis of the reforms themselves. This paper updates Portney's work on analyzing cost-benefit analysis and expands it to evaluate reforms of the regulatory process. I use as my primary example the recent peer-review guidelines issued by OMB. I argue that we may have reached a point of diminishing returns in regulatory reforms, that the peer-review guidelines likely have costs that exceed their benefits, and that further regulatory reforms merit closer evaluation.