The Fabricare system: a multi-agent-based scheduling prototype

Several trends in society in general, and manufacturing in particular, have changed the way business was made in the last decades of the 20th century, setting new requirements for companies and individuals. The research question being addressed in this paper is concerned with the ability to build computer-supported manufacturing systems able to cope with current and future requirements. For this matter, a hypothesis based on the holonic and multi-agent paradigms is proposed. The paper describes a holonic architecture for manufacturing enterprises and a prototype system (named Fabricare) for manufacturing orders scheduling based on that architecture. A negotiation mechanism called ‘contract net with constraint propagation protocol’ was developed for regulating the interaction between holons in the system. This protocol also implements a negotiation-driven scheduling procedure.     

Urban poverty and labor market dynamics in five Latin American countries: 2003–2008

Latin America experienced a long period of sustained growth since 2003 that positively impacted social and labor market indicators, including poverty. This paper contributes to the understanding of this process as it carries out a comparative study of poverty dynamics in five Latin American countries during 2003–2008. It analyzes the extent to which countries with different levels of poverty incidence diverge in terms of poverty exit and entry rates, identifies the relative importance of the frequency and impact of events associated to poverty transitions and examines how these events affect households with different characteristics. For this, a dynamic analysis of panel data is carried out using regular household surveys. Sizeable rates of poverty movements were observed in all five countries and it was found that a large proportion of household experienced positive events, mainly related to the labor market; however, only a small fraction of them actually exited poverty. Demographic events and public cash transfers proved to be of little relevance; in particular, the latter did not contribute much either to intensify poverty exits or to prevent poverty entries. Households with children experienced more (less) negative (positive) events than those without children. It appeared therefore that even when the economy behaved reasonably well at the aggregate level, high levels of labor turnover and income mobility (even of a negative nature) still prevail, mainly associated to the high level of precariousness and the undeveloped system of social protection that characterize the studied countries.     

Crime Victimization in Latin America and Intentions to Migrate to the United States

Among the challenges faced by Latin America at the onset of the 21st century is the increase in crime and violence that began in the mid-1980s, and which, to one degree or another, has afflicted most countries in the region. In this study we explore the potential implications of the upsurge in crime on migration by testing the hypothesis that crime victimization in Latin America increases the probability that people have given serious thought to the prospect of migrating with their families to the United States. Using Latinobarometro public opinion surveys of approximately 49,000 respondents residing in 17 countries in 2002, 2003, and 2004, the results of a Hierarchical Generalized Linear Model found that, net of individual and country-level control variables, the probability of seriously considering family migration to the United States was around 30 percent higher among respondents who reported that they or a member of their family was a victim of a crime sometime during the year prior to the survey. Evidence that victimization promotes the propensity to emigrate is a finding that contributes to an understanding of the transnational consequences of the increase in crime in Latin America, and adds a new variable to the inventory of factors that encourage people to migrate to the United States.     

The Role of Task and Process Conflict in Strategizing

The implementation of strategic initiatives is central to organizational success because it involves not just the execution of strategy, but also the formulation of strategy content. Yet, strategy implementation is complex, partially because it is critically affected by human dynamics. These dynamics are an integral but poorly understood aspect of how organizations negotiate multiple goals. Conflict is one dynamic that has received little attention in the context of strategy implementation. The authors address this gap by studying task and process conflict as a firm implements a strategy in real time. The study demonstrates that process conflict directs attention to problems with how to implement a strategy, while task conflict directs attention to problems with the content of the strategy. Critically, however, managers can only harness generative effects of conflict if they correctly diagnose process and task conflict, and respond to both forms of conflict. This requires an understanding of the entwined nature of task and process conflict, and highlights the necessity of aligning responses to these forms of conflict. Thus, this study offers conflict as one explanatory mechanism of how actors execute strategy and clarify strategy content.     

Optimal designs for discriminating between some extensions of the Michaelis–Menten model

In this paper some results on the computation of optimal designs for discriminating between nonlinear models are provided. In particular, some typical deviations of the Michaelis–Menten model are considered. A common deviation of this pharmacokinetic model consists on adding a linear term. If two linear models differ in one parameter the T-optimal design for discriminating between them is c-optimal for estimating the added linear term. This is not the case for nonlinear models.     

Neutralizing the political threat of the marginal woman: Lesbians’ beliefs about bisexual women

One might expect lesbian and bisexual women to form a strong alliance because of their common marginalization in a heterosexist and sexist society. But previous research has shown that tension exists between lesbian and bisexual women and that some segments of the lesbian community consider bisexuality a threat to lesbian politics. In this article I report data on beliefs about bisexual women gathered from 346 self‐identified lesbians via self‐administered questionnaires and discuss the relationship between lesbian and bisexual women as a special case of intergroup relations. Most lesbian respondents believed that bisexual identity is more likely than lesbian identity to be a phase or a way of denying one's true sexuality and that bisexual women are less personally and politically loyal and more willing and able to pass as heterosexual than are lesbians. Lesbians’ beliefs about bisexual women were uncorrelated with demographics, but lesbians who reported having some heterosexual feelings were less inclined to hold derogatory beliefs about bisexual women than were lesbians whose feelings were exclusively homosexual. On the basis of intergroup relations theory, I argue that lesbian‐bisexual relations are in the “amicable consensus” stage of political development (Jackman & Senter, 1983) and that lesbians’ attitudes are likely to change as the nascent bisexual political movement grows in strength. Methodological issues pertaining to the measurement of lesbians’ attitudes toward sexuality, including the reactivity of these attitudes to various measurement strategies, are discussed.     

Overcoming barriers to access and utilization of hospice and palliative care services in African-American communities

While there is ample evidence to support the need for hospice and palliative care services for African Americans, only 8% of patients who utilize those services are from African-American communities. The underutilization of end-of-life and palliative care can be attributed to several barriers to service access including incompatibility between hospice philosophy and African-American religious, spiritual, and cultural beliefs; health care disparities; distrust of the medical establishment; physician influence; financial disincentives, and hospice admission criteria. Suggestions for dismantling barriers to care access include developing culturally competent professionals in the health and human services, expanding the philosophy of hospice to include spiritual advisors from client communities, and funding national initiatives to promote improved access to health care at all stages in the life cycle of members of all underserved communities.     

Harnessing Diversity and Collective Action in the Top Management Team

Diversity has become an important issue at all levels of the company from the boardroom to the back office. It is increasingly apparent that diversity is vital to productivity, with academic research indicating an important link between diverse top management team (TMT) composition and corporate performance. However, the nature of this link remains elusive, as there is little accessible research that can help top teams to evaluate how diversity impacts on their strategic capacity. This paper seeks to fill this gap by developing a conceptual framework, illustrated with case examples, to explain the relationships between TMT diversity and TMT collective action. As collective action is difficult to attain from top teams that are high in diversity, six practical processes are developed from this framework for establishing and exploiting top team strategic capacity. The paper concludes by outlining the theoretical implications of the framework.

It is the range of skills and attributes acquired through a diversity of experiences and backgrounds that combine to create a cohesive and effective board.¹

     

The relationship between old-fashioned and modern heterosexism to social dominance orientation and structural violence

This study proposes that broader social systemic factors could have a role in the perpetuation of two types of heterosexism. Old-fashioned and modern heterosexism are discussed and differentiated. The roles of social dominance orientation and the acceptance of structural violence in the maintenance of heterosexism are explored. Results indicated that social dominance orientation and the acceptance of structural violence predicted the level of old-fashioned and modern heterosexism in a sample of 129 people. Acceptance of structural violence better predicted both modern and old-fashioned heterosexism than did social dominance orientation. Such relationships highlight the possibility that social systemic beliefs may create and support heterosexism.