An agent-based approach to modelling virtual enterprises

This paper describes how virtual enterprises (VEs) can be modelled using the AGORA multi-agent architecture, designed for modelling and supporting cooperative work among distributed entities. The model consists of a structure of AGORAs and agents, where AGORAs are facilitators of cooperative work for agents and the agents represent the partners of the VE, the cooperative mechanisms and the service providers. The distributed and goal-oriented nature of the VE provides a strong motivation for the use of agents to model VEs. The main advantages of this approach are that the structure of AGORAs provides a homogeneous modelling environment throughout the life cycle of the VE, traceability of the VE activities and a history of the VE. In addition to these, it is important to point out that, agents being computational entities, the resulting model provides an easy and efficient passage from the model to the computational support that is required by the VE.     

Nurses' representations of the perceived causes of work-related stress: a network drawing approach

This paper reports a study, involving a network drawing approach, that examined how nurses perceive the interrelationship between causes of workplace stress. Network analysis originated in sociology as a method of examining the relationship between people, objects or events. It has recently been adapted to examine participants' perceptions of the relationships between causes of a phenomenon, either by asking participants to complete a grid rating the strength of all the possible links between causes or by getting them to draw a diagram of the links that they think are important. The network drawing technique, in which participants are asked to draw a diagram indicating perceived causal links between nominated causes of stress and also to indicate the strength of these links, was employed in this study. The causes of stress were taken from a previous study in which nurses kept a diary for one week detailing stressful events and their causes. There were 48 participants in the present study and the main results confirmed the importance of staffing levels and inadequate support as perceived direct causes of stress. The study also revealed the importance of indirect links between staffing levels and other causes of stress. The networks illustrate how direct and mediating causes of stress are connected and lie largely outside nurses' control. The results are discussed in relation to other recent work on the causes and experience of stress by nursing staff.     

On a loss of room: an autoethnographic assay of fact 1

This paper was inspired by the circumstances around the withdrawal of my workspace five years after retirement. It is written from an autoenthographic perspective, and this small account leads to questions about the relationship between space and self – the physicality of reality and what constitutes the fact so created. That these questions are asked via the fiction of the autobiographical is also explored, as is the nature of autoethnography.     

The Substitution Hypothesis: The Impact of Premarital Liaisons and Human Capital on Marital Timing

Nonmarital romantic and sexual relationships occur concurrently with the human capital acquisition process and contribute to delaying or forgoing marriage. Event history analysis is used to model the marital hazard rate of 341 White women born between 1960 and 1963 in a Western metropolitan area. In addition to family background, adolescent characteristics, and employment and educational histories, the structure of the women's premarital liaisons is shown to play an important role in the timing of first marriage. The greater a woman's involvement in nonmarital romantic and sexual activity, the less likely she is to be married by age 27–30. Human capital characteristics and the dynamics of relationship histories operate independently to explain marital timing. This supports the theory that women substitute premarital liaisons for marriage early in the adult life course. However, there is no evidence that highly educated women, or those who are students, are more or less likely to do so than others.     

A note on the asymptotic distribution of the maximum likelihood estimator for the scalar skew-normal distribution

We consider likelihood based inference for the parameter of a skew-normal distribution. One of the problems shown by this model is the singularity of the Fisher information matrix when skewness is absent. We derive the rate of convergence to the asymptotic distribution of the maximum likelihood estimator and study an alternative parameterization which overcomes problems related to the singularity of the information matrix.     

Mothers and Fathers in the Workplace: How Gender and Parental Status Influence Judgments of Job-Related Competence

We investigated the influence of gender and parental status on employment decisions. The shifting standards model predicts that parenthood polarizes judgments of women and men such that mothers are held to stricter employment standards than fathers. Social role theory predicts that parenting role, rather than gender, guides judgments of mothers and fathers. One hundred ninety-six undergraduates at two universities evaluated a job applicant; the applicant was either male or female and was either single or married with two children. Results showed that parents were judged less agentic and less committed to employment than non-parents. Parental status also interacted with gender, indicating that fathers were held to more lenient standards than mothers and childless men. We discuss theoretical and practical implications.     

ECONOMIC ROULETTE

Complementing previous literature on welfare reform and the character of jobs in the low-wage labour market, we illustrate the lack of regularity and security that mark the jobs held by many low-income mothers. To do so, we present a typology of mothers’ work patterns and illustrate their experiences through case examples. Our qualitative analysis of longitudinal pathways-to-work in three cities involved an examination of the experiences of 99 diverse, low-income working mothers with a young child. The work patterns that emerged from this analysis include: continuous duration of a single job; multiple job spells; underemployment; and churning in and out of employment. Findings indicate that a complicated ‘coming together’ of well-paying stable jobs, consistent aid from public systems and stable family networks are necessary for mothers to take even the first steps into stable employment.     

Attachments to Family and Community and the Young Adult Transition of Rural Youth

Rural youth in economically troubled regions develop plans for their future in a context in which opportunities for educational and occupational success generally lie elsewhere, prompting the need to migrate. This study investigates the links between rural adolescents' residential preferences and their plans for the future, perceptions of local opportunity, and ties to family and community. We examine whether residential preferences shape the pathways to adulthood through decisions about where to live as well as educational and occupational attainments. Residential preferences are indeed related to adolescents' academic achievements and future educational plans, their relationships with parents, and perceptions of local job opportunities, but they are not associated with family socioeconomic background and social ties to the community. For the most part, residential preferences are linked to where young people live and pursue higher education in the years after high school, but generally not to their socioeconomic attainment.