A microcomputer simulation of an automated non ferrous sand casting foundry

In this paper the authors describe the simulation of an automated non ferrous sand casting foundry using a popular microcomputer to evaluate the effects on output of several machine loading rules. The programmed facilities allow the scheduler to experiment with his own loading rules on actual, rather than hypothetical, batches of jobs which, if found to increase output or some other measure of performance, can be stored for scheduling future jobs. Scheduling in such an interactive manner allows the simulation program to learn and improve upon scheduling rules on actual jobs in much the same way as the human scheduler would in practice, without the associated risks of affecting production.     

The interaction of aging and 10 years of racing on ultraendurance running performance

The aim of this study was to examine the interaction between aging and 10 years of racing in endurance runners. Race-time data from 194 runners who had completed 10 consecutive 56-km ultramarathons were obtained. The runners were either 20.5 +/- 0.7, 30.0 +/- 1.0, 39.9 +/- 0.9, or 49.4 +/- 1.0 years old at their first race. Each runner's race speed was determined for each race over the 10 years. Data were analyzed using repeated-measures ANOVA, one-way ANOVA, and independent t tests and showed that performance improved and declined at greater rates for younger runners; younger runners had a greater capacity for improvement than older runners; approximately 4 years were required to reach peak racing speed, regardless of age; it was not possible to compete at peak speed for more than a few years; and the combined effects of 10 years of aging and racing neither improve nor worsen net performance. In conclusion, these data suggest that although these runners showed similar patterns of change in race speed over a 10-year period, the extent of change in performance was greater in younger than in older runners.     

Immigration and ageing

Journal of Population Research - Contrary to popular belief, the low rates of institutionalisation of the ethnic minority aged cannot be explained by a greater availability of family support for...     

Size,Skill and Sorting

Abstract. The rise in inequality between the 1970s and the 1990s and the persistent gap in pay between large and small employers are two of the most robust findings in the study of labor markets. Mainstream economists focus on differences in observable and unobservable skills to explain both the overall rising inequality and the size–wage gap. In this paper we model how increasing returns to skill can affect the size–wage gap both with constant sorting and with size‐biased, skill‐biased technological change (e.g. if large firms always had access to computers, but small firms gained access to computers with the rise of affordable personal computers). We analyze the Current Population Surveys from 1979 to 1993 to determine whether large and small employers are converging in terms of mean wages (the employer size–wage effect), wage structures by occupation and education, characteristics of employees, and wage structures by region. We find mixed evidence of convergence and no consistent support for any single version of human capital theory.     

Quality costing: a management review

This paper relates a review of the English language literature on quality costing and traces its historical development; it provides authoritative reading on the subject. The review also has a focus on collection and use of quality-costing methods, quantitative cost data and the role and views of accountants in the task of quality-cost collection and reporting. Amongst the main findings is the preoccupation with the prevention – appraisal – failure categorization of quality costs and lack of guidance on definitions. The considerable impact of the American quality profession on the development of quality costing is pointed out along with the increasingly positive stance of accountants.     

Francine Blau receives IZA Prize in Labor Economics

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Francine Blau receives IZA Prize in Labor Economics     

Independent child protection assessments: incorporating a therapeutic focus from an integrated service context

Assessment following serious child abuse is a significant activity for the social work, psychology and psychiatric professions. Notwithstanding the profound significance of the consequences for abused children and their families from recommendations made by such assessments, there is little research which examines the process and outcome of child protection assessments. This paper describes the professional practice principles of an independent assessment team and presents preliminary findings from a retrospective examination of 160 major independent assessments undertaken over a period of 11 years. The review suggests that nearly 60% of the families gained some therapeutic benefit from the assessment process and outlines the areas in which such benefits occurred. It is argued that structuring assessments in a way which maximizes the possibility of parents/carers effecting changes in problem areas is the essence of a constructive partnership relation with families. Copyright © 1999 John Wiley & Sons, Ltd.