Bayesian approach to the inverse problem in a light scattering application

In this article, static light scattering (SLS) measurements are processed to estimate the particle size distribution of particle systems incorporating prior information obtained from an alternative experimental technique: scanning electron microscopy (SEM). For this purpose we propose two Bayesian schemes (one parametric and another non-parametric) to solve the stated light scattering problem and take advantage of the obtained results to summarize some features of the Bayesian approach within the context of inverse problems. The features presented in this article include the improvement of the results when some useful prior information from an alternative experiment is considered instead of a non-informative prior as it occurs in a deterministic maximum likelihood estimation. This improvement will be shown in terms of accuracy and precision in the corresponding results and also in terms of minimizing the effect of multiple minima by including significant information in the optimization. Both Bayesian schemes are implemented using Markov Chain Monte Carlo methods. They have been developed on the basis of the Metropolis–Hastings (MH) algorithm using Matlab^® and are tested with the analysis of simulated and experimental examples of concentrated and semi-concentrated particles. In the simulated examples, SLS measurements were generated using a rigorous model, while the inversion stage was solved using an approximate model in both schemes and also using the rigorous model in the parametric scheme. Priors from SEM micrographs were also simulated and experimented, where the simulated ones were obtained using a Monte Carlo routine. In addition to the presentation of these features of the Bayesian approach, some other topics will be discussed, such as regularization and some implementation issues of the proposed schemes, among which we remark the selection of the parameters used in the MH algorithm.     

The compliance challenge: Implications for social security in the People's Republic of China

Abstract   Discussion of social security compliance in developing societies has mainly focused on systemic administrative and operational issues. The article argues that analysis of compliance calls also for frameworks which draw lessons from nation-specific policy circumstances and comparisons of social protection regime types. Using such an approach, it also examines social security compliance in the context of China. Four considerations are found to be central to improved compliance: the sustainability of economic growth; trust in social institutions and regulations; the differing social values inherent in regime types; and institutional inertia accumulated in China's existing policy path.     

Correlates of Interpersonal Ethnoracial Discrimination Among Latino Adults with Diabetes: Findings from the REACH Detroit Study

ABSTRACT

The purpose of this study is to identify the social and economic correlates of reported experiences of interpersonal ethnoracial discrimination among Latino adults in Detroit. We examine whether the correlates of interpersonal ethnoracial discrimination vary according to the domain of discrimination and compare findings for individual domains of discrimination to a composite measure of experiences of discrimination. This study suggests that the frequency of reported discrimination is moderately high, and relatively common among Latinos with diabetes who live in Detroit. The findings demonstrate that immigration and ethnicity-related factors, such as greater comfort speaking Spanish and being born in the United States, were persistent correlates of more frequent encounters of interpersonal ethnoracial discrimination. Implications for social work research and practice are presented.     

The role of local government bodies in European policy-making

Since the publication of the White Paper on European governance, COM (2001) 428, the Commission has stressed that ‘people increasingly distrust institutions and politics or are simply not interested in them’, registering the growing gap between the EU and European citizens. In this context, the European institutions have been promoting several initiatives with the aim of facilitating participation in the European decision-making process. The paper will focus on: (1) the relationship between local governance and participation in the European Union; in this frame, the European institutions tried to start a dialogue with local authorities (see the role of the CoR) and the actors of civil society (through both the European Economic and Social Committee and the Transparency Policy); (2) the consequences either in the theoretical field or in practice. On one hand, the initiatives carried out have created the basis for a new model of multi-level governance and ‘participative democracy’; on the other hand the demand for wider participation produces a continuous growth of lobbying by the actors of civil society, whose regulation appears rather difficult notwithstanding the important efforts made through the European Transparency Initiative.     

Empirical Estimation of the Conditional Probability of Natech Events Within the United States

Natural disasters are the cause of a sizeable number of hazmat releases, referred to as “natechs.” An enhanced understanding of natech probability, allowing for predictions of natech occurrence, is an important step in determining how industry and government should mitigate natech risk. This study quantifies the conditional probabilities of natechs at TRI/RMP and SICS 1311 facilities given the occurrence of hurricanes, earthquakes, tornadoes, and floods. During hurricanes, a higher probability of releases was observed due to storm surge (7.3 releases per 100 TRI/RMP facilities exposed vs. 6.2 for SIC 1311) compared to category 1–2 hurricane winds (5.6 TRI, 2.6 SIC 1311). Logistic regression confirms the statistical significance of the greater propensity for releases at RMP/TRI facilities, and during some hurricanes, when controlling for hazard zone. The probability of natechs at TRI/RMP facilities during earthquakes increased from 0.1 releases per 100 facilities at MMI V to 21.4 at MMI IX. The probability of a natech at TRI/RMP facilities within 25 miles of a tornado was small (～0.025 per 100 facilities), reflecting the limited area directly affected by tornadoes. Areas inundated during flood events had a probability of 1.1 releases per 100 facilities but demonstrated widely varying natech occurrence during individual events, indicating that factors not quantified in this study such as flood depth and speed are important for predicting flood natechs. These results can inform natech risk analysis, aid government agencies responsible for planning response and remediation after natural disasters, and should be useful in raising awareness of natech risk within industry.     

The BLUE's covariance matrix revisited: A review

In this paper we comment on and review some unexpected but interesting features of the BLUE (best linear unbiased estimator) of the expectation vector in the general linear model and in particular, the BLUE's covariance matrix. Most of these features appear in the literature but are rather scattered or hidden.     

Interaction between employees' physical load factors and early support at the workplace

Physical workload is a continuous problem, even in modern workplaces. The purpose of the survey was to determine the effect of support on employees' physical load factors at workplaces. Training, guidance and support were the main focus areas of the early support intervention, which aimed to enable supervisors to find weak signals of impaired ergonomics.The survey was carried out in the form of a controlled longitudinal study, and the material was gathered via a questionnaire in both 2008 and 2010 from two co-operative trade groups. The final sample was 301 intervention subjects and 235 control subjects, and the response rate was 45% in both groups. We applied factor analysis to reduce the number of items. The physical load factors' sum score consisted of six items. We used logistic regression in the statistical analysis.Encouragement to improve processes at the workplace increased the probability of positive change (i.e. decrease) in physical load factors. The same applied to working pace, if individuals could control it themselves. In contrast, workload and the support of supervisors had a reversed impact on workers' physical load factors. Focusing on promoting workers' ergonomics is still important in workplaces when aiming to decrease physical load factors.     

Social Indicators of Substance Abuse Prevention: A Need-Based Assessment

We combine a variety of census and archival data to assess the relationships between social area characteristics and substance use. We found a substantial association between social area characteristics and substance use. We focus on intra and inter community, family, school and individual domain correlations to produce a prevention need-based score to rank communities from high to low need areas. Our analyses support the general risk and protective factor model advocated by Hawkins et al. (1992). As an important outcome of this work we suggest an objective criterion for selecting variables for the final model of the social indicators; suggest a set of weights for the selected factors and validate the selected factors with regard to substance abuse by linking the social indicator database to substance abuse outcome measures from another independent database. The selection criterion was based on intra domain correlations and proved to be robust. The weights were proportional to the information conveyed by each extracted factor. Analyses of intra-domain correlations are useful in identifying the types of prevention programs needed for each municipal area. Analyses of inter-domain correlations resulted in producing an overall need score based on social area characteristics. Many of the domains revealed more than one dimension, especially the school and the community/environment domains. Our analysis supports the use of social area characteristics in predicting the need for substance abuse prevention and treatment. It also suggests cautious and well informed decisions in selecting the indicators for a need based model.     

A Content Analysis of Career Development Theory,Research, and Practice—2013

This annual review of the career counseling and development literature presents a content analysis of refereed journal articles published in 2013. Four research questions guided the analysis: (a) What content topics were included in career development articles published in refereed journals in 2013? (b) To what extent are theory, research, and practice integrated in career development articles published in refereed journals in 2013? (c) What variation exists in the characteristics of career development articles published in refereed journals in 2013? and (d) What variation exists in the content included in theory, research, and practice articles? A total of 360 unique topics were identified in 357 articles from 24 journals. Results indicated that topic content in journals evolved slowly with limited integration of theory, research, and practice. Implications are suggested for (a) future topic content; (b) better integration of theory, research, and practice; (c) education and training; (d) journal editorial policy; and (e) future content analyses of journal articles.