Parallelizing particle filters with butterfly interactions

The bootstrap particle filter (BPF) is the cornerstone of many algorithms used for solving generally intractable inference problems with hidden Markov models. The long-term stability of the BPF arises from particle interactions that typically make parallel implementations of the BPF nontrivial. We propose a method whereby particle interaction is done in several stages. With the proposed method, full interaction can be accomplished even if we allow only pairwise communications between processing elements at each stage. We show that our method preserves the consistency and the long-term stability of the BPF, although our analysis suggests that the constraints on the stagewise interactions introduce errors leading to a lower convergence rate than standard Monte Carlo. The proposed method also suggests a new, more flexible, adaptive resampling scheme, which, according to our numerical experiments, is the method of choice, displaying a notable gain in efficiency in certain parallel computing scenarios.     

The Education–Occupation (Mis)Match of Asia-Born Immigrants in Australia

Population Research and Policy Review - Skills shortages in the developed world are being addressed through selective immigration programs. Immigrant skills wastage signifies costly inefficiencies...     

Measuring Poverty Efficiently Using Adaptive Deprivation Scales

Social Indicators Research - Deprivation scales are becoming increasingly familiar in research and official statistics on poverty. Taking advantage of the basis of these scales in Item Response...     

Exercising moral agency in the contexts of objective reality: toward an integrated account of ethical consumption

This paper engages with two contrasting approaches to conceptualising and studying consumer behaviour that appear to dominate existing research on consumption. On one hand, agency‐focused perspectives take an individual consumer to be the primary author of practice and a basic unit of analysis. On the other hand, socio‐centric paradigms focus on the social roots of consumption activities and the wider societal contexts in which they take place. The need to provide a more balanced view of consumption phenomena has been acknowledged, yet not adequately acted upon. This paper begins to fill this gap through relevant theoretical and empirical contributions. First, we provide a critical review of the dominant theoretical perspectives on consumption in general and ethical consumption in particular, highlight their key ontological assumptions and explain how they preclude a fuller understanding of the ways in which consumer practices are moulded and shaped. Taking a critical realist approach, we then present the findings from qualitative analysis of consumers' ethical food practices to empirically demonstrate the role of human agency and social structure in creating and shaping ethical consumption. Thus, by means of theoretical analysis and empirical research this paper responds to the call for a more comprehensive understanding of consumption and provides a consolidated account of consumer behaviour which acknowledges and explains the complex ensemble of individual and systemic powers in which consumer practices are contained.     

Home‐start and the delivery of family support

The publication of Child Protection: Messages from Research (Department of Health, 1995) and of the ‘Supporting Families’ Green Paper (Home Office, 1998) have both highlighted the importance of developing family support services, in keeping with the word and the spirit of the Children Act, 1989. This article presents some of the findings of a three year study of a voluntary organisation, Home‐Start, which offers support to mothers with children under five through volunteer home visiting. The article makes connections between the activities of Home‐Start and the wider debate about family support in the United Kingdom. Copyright © 2000 John Wiley & Sons, Ltd.     

Translocality,Network Structure,and Music Worlds: Underground Metal in the United Kingdom

Translocal music worlds are often defined as networks of local music worlds. However, their networked character and more especially their network structure is generally assumed rather than concretely mapped and explored. Formal social network analysis (SNA) is beginning to attract interest in music sociology but it has not previously been used to explore a translocal music world. In this paper, drawing upon a survey of the participation of 474 enthusiasts in 148 live music events, spread across 6 localities, we use SNA to explore a significant “slice” of the network structure of the U.K.'s translocal underground heavy metal world. Translocality is generated in a number of ways, we suggest, but one way, the way we focus upon, involves audiences traveling between localities to attend gigs and festivals. Our analysis of this network uncovers a core‐periphery structure which, we further find, maps onto locality. Not all live events enjoy equal standing in our music world and some localities are better placed to capture more prestigious events, encouraging inward travel. The identification of such structures, and the inequality they point to, is, we believe, one of several benefits of using SNA to analyze translocal music worlds.     

An evaluation of repertory grid technique in social work education

Social work educators need to develop a repertoire of methods to help students and practitioners reflect on and learn from practice. A matched subjects experimental research design was used to evaluate the use of repertory grid technique with cohorts of students from two social work qualifying courses. Students found completing and discussing computer analyses of grids a useful adjunct to conventional supervision. Grid completion was also associated with improved course performance.