Estimation of relative risk for events on a linear network

Motivated by the study of traffic accidents on a road network, we discuss the estimation of the relative risk, the ratio of rates of occurrence of different types of events occurring on a network of lines. Methods developed for two-dimensional spatial point patterns can be adapted to a linear network, but their requirements and performance are very different on a network. Computation is slow and we introduce new techniques to accelerate it. Intensities (occurrence rates) are estimated by kernel smoothing using the heat kernel on the network. The main methodological problem is bandwidth selection. Binary regression methods, such as likelihood cross-validation and least squares cross-validation, perform tolerably well in our simulation experiments, but the Kelsall–Diggle density-ratio cross-validation method does not. We find a theoretical explanation, and propose a modification of the Kelsall–Diggle method which has better performance. The methods are applied to traffic accidents in a regional city, and to protrusions on the dendritic tree of a neuron.

     

Networks,case managers,and the job-search experiences of unemployed people

Employment services are commonly provided in network settings, but it is rare to find social policy analyses of how unemployed people search for jobs through networks. In a germinal analysis of social networks and employment, Mark Granovetter argued that “weak ties” (less familiar contacts) are more important to finding employment than are “strong ties” (family and friends). This is because weak ties provide more novel job-relevant information. Scholarship since Granovetter has predominantly supported the opposite argument, namely, that strong ties are more important for the unemployed, because they are more plentiful and thus provide more information in aggregate. Findings are also generally coloured by the focus being on “informal” networks or personal contacts. “Formal” networks, as represented most cogently by employment service providers, are absent or underestimated in most social network studies. On the basis of a qualitative study of 80 long-term unemployed people in Australia, incorporating analysis of both informal and formal networks, we argue that although “strong informal” ties are vital to job search, it is also important to consider “weak formal” ties, which can be complementary if and where service organizations are able to supply positive case management experiences.     

Who joins unions in the public sector? The effects of individual characteristics and the law

Analysis of a large micro-data set shows that state public-sector bargaining laws significantly influence state and local government union membership in several ways. Membership probability is lowest where a right-to-work law is present; it is greatest when there are mandatory agency shop provisions. Compulsory arbitration leads to a significantly greater probability of membership than does the right-to-strike. Simulations based on model estimates indicate that policy changes along the lines of proposed national public bargaining laws could lead to major changes in public-sector union density. Among individual and demographic characteristics, membership probability is significantly affected by full-time/part-time status and the statewide extent of private-sector unionism. Although non-whites and males are more likely to be union members, race and gender membership differentials are shown to be relatively small. The author thanks Jack Fiorito, Paul Jarley, Joe Stone, and Rob Valletta for their helpful comments. Any remaining errors are his sole responsibility.     

中国劳动力构成与劳动力市场

中国经济改革中劳动力构成及劳动力市场究竟有什么变化，这是国际学界共同关心的问题。本文从中国劳动力市场发展的趋势出发，具体讨论有关产业和政治的涵义，并就中国劳动力市场所处的国际背景进行分析。     

Confucian values and the implications for international HRD

Abstract

The consideration of cultural issues has become increasingly important in scholarly inquiry and explorative practice in international human resource development (HRD). We review and explore the core characteristics of Confucian-based culture in relation to organizations and unfold how these Confucian values may affect organizational and management practices in China and other Asian countries. Five major aspects of Confucianism are examined. They are: (a) hierarchy and harmony, (b) group orientation, (c) guanxi networks (relationships), (d) mianzi (face) and (e) time orientation. The impact of these values on management practices in the Chinese organizational context is presented in four areas: (a) working relationships, (b) decision-making processes, (c) ruling by man (ren zhi) instead of by law (fa zhi) and (d) HR practices. Implications for organizations and international HRD are also discussed.     

Determinants of Migrant Career Success: A Study of Recent Skilled Migrants in Australia

Australia has been aggressively pursuing skilled migrants to sustain its population and foster economic growth. However, many skilled migrants experience a downward career move upon migration to Australia. Based on a survey of recent skilled migrants, this study investigates how individual (age, years of settlement, qualifications), national/societal (citizenship and settlement), and organization-level (climate of inclusion) factors influence their career success. Overall, we found that: (1) age at migration matters more than length of settlement in predicting skilled migrant career success; (2) citizenship uptake and living in a neighbourhood with a greater number of families from the same country of origin facilitate post-migration career success; and (3) perceptions of one's social/informal networks in the workplace – a dimension of perceived organizational climate of inclusion – also have a positive impact on migrant career outcomes.     

Nano Risk Analysis: Advancing the Science for Nanomaterials Risk Management

Scientists, activists, industry, and governments have raised concerns about health and environmental risks of nanoscale materials. The Society for Risk Analysis convened experts in September 2008 in Washington, DC to deliberate on issues relating to the unique attributes of nanoscale materials that raise novel concerns about health risks. This article reports on the overall themes and findings of the workshop, uncovering the underlying issues for each of these topics that become recurring themes. The attributes of nanoscale particles and other nanomaterials that present novel issues for risk analysis are evaluated in a risk analysis framework, identifying challenges and opportunities for risk analysts and others seeking to assess and manage the risks from emerging nanoscale materials and nanotechnologies. Workshop deliberations and recommendations for advancing the risk analysis and management of nanotechnologies are presented.