Parallel and interacting stochastic approximation annealing algorithms for global optimisation

We present the parallel and interacting stochastic approximation annealing (PISAA) algorithm, a stochastic simulation procedure for global optimisation, that extends and improves the stochastic approximation annealing (SAA) by using population Monte Carlo ideas. The efficiency of standard SAA algorithm crucially depends on its self-adjusting mechanism which presents stability issues in high dimensional or rugged optimisation problems. The proposed algorithm involves simulating a population of SAA chains that interact each other in a manner that significantly improves the stability of the self-adjusting mechanism and the search for the global optimum in the sampling space, as well as it inherits SAA desired convergence properties when a square-root cooling schedule is used. It can be implemented in parallel computing environments in order to mitigate the computational overhead. As a result, PISAA can address complex optimisation problems that it would be difficult for SAA to satisfactory address. We demonstrate the good performance of the proposed algorithm on challenging applications including Bayesian network learning and protein folding. Our numerical comparisons suggest that PISAA outperforms the simulated annealing, stochastic approximation annealing, and annealing evolutionary stochastic approximation Monte Carlo.     

Is education a risk factor or social vaccine against HIV/AIDS in Sub-Saharan Africa? The effect of schooling across public health periods

Early in the 30-year HIV/AIDS pandemic in Sub-Saharan Africa, epidemiological studies identified formal education attainment as a risk factor: educated Sub-Saharan Africans had a higher risk of contracting HIV/AIDS than their less educated peers. Later demographic research reported that by the mid-1990s the education effect had reversed, and education began to function as a social vaccine. Recent counter-evidence finds a curvilinear pattern, with the association between educational attainment and HIV/AIDS infection changing from positive to negative across the education gradient. To reconcile these inconsistent conclusions, a hypothesis is developed and tested that education at early stages functioned as a risk factor and later functioned (and continues to function) as a social vaccine. We reason that this shift in the direction of the education effect was concurrent with changes in the public health environment in SSA that early on heightened material benefits from educational attainment but later heightened cognitive benefits from schooling. Using the 2003/2004 Demographic Health Surveys from four Sub-Saharan African countries (Cameroon, Ghana, Kenya and Tanzania), we tested this hypothesis (differential effects of schooling) using non-linear regression analysis (probit), identifying the different public health periods and controlling for confounding factors. The results support the hypothesis that the education effect shifted historically in the HIV/AIDS pandemic in SSA as we hypothesized.     

A Proposal for Public Sociology as Localized Intervention and Collective Enterprise: The Makings and Impact of <Emphasis Type="Italic">Invisible in Austin</Emphasis>

What can local public sociology look like, and what does it accomplish? This essay tracks the origins, makings and impacts of the book Invisible in Austin to evaluate its model of public sociology: as a collective enterprise with a local aim. Invisible in Austin: Life and Labor in an American City, the culmination of a three-year collaborative qualitative research project between a professor and twelve graduate students, depicts social suffering as lived for 11 individuals in Austin, Texas—a booming, highly segregated city with one of the country’s highest levels of income inequality. In its design, production, and effects, it envisions public sociology in a two-fold sense—in its joint, horizontal making, and in its intent to intervene in the local public sphere to make visible the daily lived experience of social marginality for those whose labor allows Austin to survive and thrive as a hip, creative technopolis—house cleaners, office machine repairers, cab drivers, restaurant cooks and dish washers, exotic dancers, musicians, and roofers, among them. Reflecting on the origins of the book, its joint assembling, and its outcomes thus far, we take stock of the lessons learned. In so doing, we provide a rubric for evaluating the wide spectrum of possible impacts of a public sociological intervention: through direct and indirect audience engagements, on the project’s subjects, and on local public policy. This reflection concludes with three suggestions: to approach public sociology as collective enterprise, to take narrative seriously, and to seek wide exposure.     

Individualism and Marriage: Ideal Types for Making Sense of the Relationship between Self and Sacrifice

The question of how the individual and group relate is one that has long interested social theorists. Changes in family form and structure in the contemporary West resituate this question in a contentious public debate regarding how the prevalence of new family forms may contribute or be deleterious to the well-being of individuals and families. Sociological discourse on marriage and the family generally tends to mirror this debate by dichotomizing individualism and commitment and self and marriage, resulting in an obfuscation of our understanding of the forms and styles in marriage. In order to clarify and advance this discussion, we show how individualism and commitment are mutually required in a modern world. We follow this by outlining a logically-derived typology that, along with a committed individualist and a group conformer, includes two intermediate types: a self-regulator and a relationship negotiator. We empirically demonstrate the utility of these types by showing how they correspond with the ways that interviewees talk about marriage in six local congregations, and we suggest various social factors that may particularly impact the development of local marriage cultures. These types provide a theoretical frame for understanding how individualism and commitment are intertwined and require each other.     

Gender and Performance Capital among Local Musicians

This article extends Bourdieu’s field theory to explain how learning spaces in the Toronto folk and metal scenes create gendered access to a field-specific form of cultural capital: performance capital, or the instrumental and interpersonal skills required to perform music. Folk musicians develop performance capital in open-access spaces, such as workshops and open stages at local folk clubs, while metal musicians learn in private spaces such as garages, basements, and rented rehearsal rooms. Folk’s learning spaces are open to all aspiring musicians, while access to heavy metal’s learning spaces relies on social networks from which women are often excluded. These different processes of capital development can lead to greater or lesser opportunities for women to become cultural producers: In Toronto, women make up approximately five percent of heavy metal musicians, but almost half of practicing folk musicians.     

Sexual Orientation,Unemployment and Participation: Are Gays Less Employable than Straights?

This paper is the first attempt to assess, in a unified econometric framework, the existence and the magnitude of both the sexual orientation participation gap and the sexual orientation unemployment gap. Having identified male same-sex couples using the Employment Survey, we use a bivariate probit selection model where the labor supply and the employment equation are jointly estimated for the French labor market. The results show that both participation and employment probabilities are significantly lower for gay employees compared to their heterosexual counterparts. Further investigations indicate that young gay workers, particularly, are more exposed to the unemployment risk than older ones. The beginning of a professional career and the subsequent entry to the labor market appear to be difficult steps to overcome for gay workers who spend more time than their heterosexual counterparts to find the good job.     

Subjective Recognition of Emotional Expressions in Face Transplant Patients

One of the most prevalent problems in face transplant patients is an inability to generate facial expression of emotions. The purpose of this study was to measure the subjective recognition of patients’ emotional expressions by other people. We examined facial expression of six emotions in two facial transplant patients (patient A = partial, patient B = full) and one healthy control using video clips to evoke emotions. We recorded target subjects’ facial expressions with a video camera while they were watching the clips. These were then shown to a panel of 130 viewers and rated in terms of degree of emotional expressiveness on a 7-point Likert scale. The scores for emotional expressiveness were higher for the healthy control than they were for patients A and B, and these varied as a function of emotion. The most recognizable emotion was happiness. The least recognizable emotions in Patient A were fear, surprise, and anger. The expressions of Patient B scored lower than those of Patient A and the healthy control. The findings show that partial and full-face transplant patients may have difficulties in generating facial expression of emotions even if they can feel those emotions, and different parts of the face seem to play critical roles in different emotional expressions.     

Religiosity and Labour Earnings in Canadian Provinces

Using recent data from the Canadian General Social Survey, I examine how religious belief and practice relate to labour earnings in Canada. Noting that religious landscape strongly varies across Canadian provinces, I explore whether these discrepancies are reflected in the association of wages and religiosity indicators, for men and women. Moreover, I identify two groups of individuals, one without any tie with religion and spirituality, and the other shaping their lives around them. I find that males belonging to the least religious group earn significantly below otherwise identical individuals in the high affiliation province of Newfoundland, while they enjoy a ceteris paribus wage premium in the low religiosity provinces of British Columbia and Québec. Females of the most religious group, on the other hand, are found at a disadvantage in the Canadian west, where affiliation with Conservative Protestantism is more prevalent.