Modelling activity times by hybrid synthetic method

Uncertain (manual) activity times impact a number of manufacturing system modules: plant and layout design, capacity analysis, operator assignment, process planning, scheduling and simulation. Direct observation cannot be used for non-existent production lines. A hybrid direct observation/synthetic method derived from Method Time Measurement available in industry is proposed. To determine accurate activity times required by heuristics and metaheuristics optimisation, manufacturing system modules are modelled by MILP and operator efficiency parameters are used for time standardisation. Among human factors considered are skill and ergonomics. Application to the sterilisation of reusable medical devices is extensively described. Experimental data taken from observation on the field and a worst-case date have shown the model direct applicability for professionals also to non-manufacturing cases.     

The Authority of the Holy Revisited: Habermas, Religion, and Emancipatory Possibilities

This article argues that Jürgen Habermas's view of religion as anathema to rational critical discourse reflects his misunderstanding that religion comprises a monolithic and immutable body of dogma that is closed to reason. Illustrative data from Catholic history and theology and empirical data gathered from contemporary American Catholics are used to show the weaknesses in Habermas's negation of the possibility of a self-critical religious discourse. Specifically, I highlight the doctrinal differentiation within Catholicism, its longstanding theological emphasis on the coupling of faith and reason, institutional reflexivity, and the doctrinally reflexive reasoning that contemporary Catholics use in negotiating what might appear as "contradictory" identities (e.g., being gay or lesbian and Catholic). Although the data presented take issue with Habermas's disavowal of religion, the article shows that the practical relevance of doctrinal reasoning at both the institutional and the individual level vindicate Habermas's faith in the emancipatory potential of reasoned argumentation to advance participative equality.     

Using Economic Theory and Research to Better Understand Volunteer Behavior

The literature on the determinants of volunteering for nonprofit organizations is highly complex, and noconceptual model has received general support (Winniford, Carpenter, and Grider, 1997). Researchers often cite the huge economic impact that nonprofit organizations have on the economy as a whole. However, they seldom mention the small but potentially important body of research on the determinants of the supply of volunteer labor that appears in the economics literature. �The purpose of this article is to outline some of the economic arguments used to explain the determinants of volunteering and point out some cases where they may support other theories and concepts concerning the determinants of volunteering.     

Sociology’s <Emphasis Type="Italic">Suicide</Emphasis>: A Forensic Autopsy?

For decades Durkheim’s theory of suicide has been tested and found wanting. Yet, rather than being consigned to the dust-bin of history, it lives on and is pointed to as an exemplar of the powers of sociological theory and research. If this rationalizing and/or dismissal of so many falsifications of the theory were an isolated phenomenon, it might be evidence of some lemming-like propensity for suicide or a disciplinary death-wish, among a few sociologists. But it appears to be a much more widespread and common occurrence. In this paper we explore some possible explanations of this ‘falsification denial’—‘The Social Misconstruction of Reality’ (Hamilton 1996), ‘When Prophecy Fails’ (Festinger et al. 1956), ‘Underdetermination’ (Duhem 1954; Quine Journal of Philosophy 67:178–183, 1970, Erkenntnis 9:313–328, 1975; Lakatos 1970), and ‘Boundary Maintenance’ (Erikson 1966), and we outline some of the more important and pernicious consequences of this falsification denial for the discipline and future of sociology.     

Waning vigilance and the disposition effect: Evidence from Thailand on individual investor decision making

We argue that existing explanations for the stock-market investor's disposition to “ride losers too long” are unsatisfactory because they abstract from any role for information processing. We propose instead that the disposition effect is a special case of “waning vigilance:” investors pay less attention to new information and analysis when making decisions about loss makers and are therefore slower to sell them when arguments in favor of holding cease to be valid. Results from a Thai individual investor survey are presented as empirical evidence in support of the hypothesis that vigilance is reduced following losses.     

HIV/AIDS Risk Reduction Intervention for Women who have Experienced Intimate Partner Violence

A growing body of literature highlights the association between women who have experienced intimate partner abuse (IPA) and their heightened risk for HIV/AIDS (human immune deficiency syndrome/ acquired immune deficiency syndrome) infection. Finding HIV risk reduction strategies that are contextually relevant for this population is an important public policy priority. This qualitative study researched women who have experienced intimate partner abuse in order to develop a HIV/AIDS risk reduction intervention unique to their circumstances. This pilot study explored the critical components of such an intervention among a racially/ethnically stratified (African-American, Mexican-American and Anglo) sample of women (n=43) who have experienced IPA. Focus groups were conducted and transcribed, and a content analysis was used to identify major themes. In all five focus groups, participants viewed the research as interesting, good, beneficial, and/or important based on their perceptions of risk for infection. Respondents felt that they knew of ways to protect themselves from infection in non-abusive relationships; however, acknowledged the difficulties of doing so given the context of their abusive relationships. Examining the racial/ethnic differences across focus groups showed that the language used by women is quite variable. The ways in which survivors define rape, sexual abuse, and their own experiences are all unique; however, their actual experiences have many similarities. Discussed at length are the topics participants shared as critical in informing the design of an intervention and the relevance of the findings to social work clinical practice is explained.     

The impact of place? A reassessment of the importance of the South in affecting beliefs about racial inequality

Research shows that individuals living in the southern part of the United States express more negative racial attitudes than those living outside the South. Using data from The American National Election Study (NES), the purpose of this paper is to assess whether key factors often associated with the Southern attitude distinction are indeed more potent in the South than elsewhere. Drawing data from the 1980s, 1990s, and 2000s, we further assess whether the impact of the South has increased or decreased over time. Results indicate that the impact of the South is negligible at best. Findings do show that place does matter for conservatives. However, in this case, non-South location matters more than the South. Relative to their liberal counterparts, conservatives in the non-South espouse more individualistic beliefs than do their Southern counterparts. These findings are discussed within the dominant theoretical framework in this area.     

More nonparametric Bayesian inference in applications

Discussion of “Nonparametric Bayesian Inference in Applications” by Peter Mueller, Fernando A. Quintana, Garritt Page: More Nonparametric Bayesian Inference in Applications.     

Characterizing Mother’s Dating After Divorce

Mothers dating after divorce is a dynamic process, where not all mothers date the same way after divorce. However, few studies have examined the different ways that mothers date after divorce, which should influence maternal well-being, risk behaviors, and the quality of their relationships. This study characterizes four different approaches to mothers’ repartnering (referred to as repartnering histories): no dating, dating one partner monogamously, dating multiple partners serially, and dating multiple partners simultaneously. Each repartnering history is characterized by demographic variables, relationship quality, and maternal well-being. Implications of the study are discussed.