An algebraic and Bayesian technology for object recognition

This paper presents a new robust, low computational cost technology for recognizing free-form objects in three-dimensional (3D) range data, or, in two dimensional (2D) curve data in the image plane. Objects are represented by implicit polynomials (i.e. 3D algebraic surfaces or 2D algebraic curves) of degree greater than two, and are recognized by computing and matching vectors of their algebraic invariants (which are functions of their coefficients that are invariant to translations, rotations and general linear transformations). Such polynomials of the fourth degree can represent objects considerably more complicated than quadrics and super-quadrics, and can realize object recognition at significantly lower computational cost. Unfortunately, the coefficients of high degree implicit polynomials are highly sensitive to small changes in the data to which the polynomials are fit, thus often making recognition based on these polynomial coefficients or their invariants unreliable. We take two approaches to the problem: one involves restricting the polynomials to those which represent bounded curves and surfaces, and the other approach is to use Bayesian recognizers. The Bayesian recognizers are amazingly stable and reliable, even when the polynomials have unbounded zero sets and very large coefficient variability. The Bayesian recognizers are a unique interplay of algebraic functions and statistical methods. In this paper, we present these recognizers and show that they work effectively, even when data are missing along a large portion of an object boundary due, for example, to partial occlusion.     

Disparities in Physical Health Conditions Among Lesbian and Bisexual Women: A Systematic Review of Population-Based Studies

We conducted a systematic review to assess evidence for disparities for lesbian and bisexual women (i.e., sexual minority women [SMW]) in comparison with heterosexual women across a range of nine physical health conditions. Among the k = 11 studies meeting eligibility criteria, almost every comparison (i.e., heterosexual vs. (a) lesbian, (b) bisexual, or (c) both lesbian and bisexual women) was in a direction indicating SMW disparities. Despite limited power due to small samples of SMW, we found evidence of disparities as indicated by a statistically significant adjusted odds ratios for asthma (5 of 7 comparisons), obesity (8 of 12), arthritis (2 of 3), global ratings of physical health (4 of 7), and cardiovascular disease (1 of 1). Evidence was lacking for cancer (1 of 4), diabetes and hypertension (both 1 of 5), and high cholesterol (0 of 3). Future work should confirm findings in more diverse, larger samples and should examine potential explanatory factors.     

Cognitive behavioral interventions for depression among Hispanic people: promising meta-analytic evidence for deep cultural adaptations

ABSTRACT

Depressive disorders are common among Hispanic people. Evidence-informed guidelines indicate cognitive behavioral interventions (CBI), but they were developed primarily with non-Hispanic White people. Narrative studies of clients and workers along systematic review evidence suggested that well-defines cultural adaptations of CBIs would likely improve outcomes among Hispanics people with diverse mental health problems. We advanced the meta-analytic hypothesis that CBIs incorporating so-called “deep structure” cultural adaptations will be more effective than otherwise similar, but more superficially, “surface structure” or non-adapted interventions with depressed Hispanic people. This meta-analysis synthesized evidence from nine typically randomized trials in the United States with one subsample from the Commonwealth of Puerto Rico. Most clients were young women, living in poverty and suffering a reactive depressive episode. We found statistical and practical support for our hypothesis. In most practice contexts, CBI success rates were between 15% and 30% better than those typically observed with other usual practices. Moreover, these effects were maintained at 6- to 12-month follow-up. Given the size and growth of the Hispanic American population, their prevalent experience of depression, and the size of the intervention effects, these synthesized findings seem of potentially great human, clinical, and policy significance.     

Social workers' attitudes to the law: an Israeli perspective

Doron I, Karpel M, Or‐Chen K. Social workers' attitudes to the law: an Israeli perspective
Int J Soc Welfare 2010: 19: 95–103 © 2009 The Author(s), Journal compilation © 2009 Blackwell Publishing Ltd and the International Journal of Social Welfare. In recent years, there has been a general shift towards integration and cooperation between lawyers and social workers, both professionally and ideologically. The goal of this study was to explore the general attitudes of social workers toward the law. The hypothesis was that, due to the recent legal and professional changes in Israel, social workers would express positive attitudes towards the law. For the purpose of this study, a closed questionnaire containing 25 statements regarding the law and its relationship to social work was used. The research population consisted of 202 social workers from Haifa and the Northern region of Israel. The findings of this study support the hypothesis that there is indeed a tendency to closer ideological and professional proximity between social work and the law in Israel. However, especially regarding courts and the litigation process, their attitudes in response to the statements were relatively less favourable.