An Investigation of Scheduling Policies in a Dual-Constrained Manufacturing Cell*

In previous group scheduling studies, labor has essentially been ignored by assuming that enough labor is assigned to each machine in the cell. In reality, however, management usually does not have the resources to employ a laborer at each machine in the cell (i.e., machines need to share labor). Both labor scheduling and group scheduling heuristics need to be administered to manage the cell effectively. This study develops and examines scheduling procedures for a dual-constrained (i.e., machine and labor) manufacturing cell. Eleven decision rules are developed and tested under 16 different experimental conditions. The experimental factors used are interarrival time distribution, cell load, setup-to-run-time ratio, and transfer-to-run-time ratio. Results show that interarrival time distribution and cell load have the greatest impact on the performance of the cell. This suggests that effective production planning aimed at reducing job arrival variation and leveling the cell load can substantially improve cell performance. Among the experimental factors, setup and transfer-to-run-time ratio factors had the strongest influence on the rankings of the decision rules. These rankings were fairly robust across all experimental conditions and performance measures. The results also indicated that the inclusion of labor as a contraint in the cell had a significant impact on the performance of several group scheduling heuristics. Finally, it was shown that the best performing decision rules consider both transfer time and subfamily setup times.     

The Influence of Family and Community Social Capital on Educational Achievement*

Abstract It is increasingly recognized that families and communities are important in helping youths develop the knowledge and skills they need to obtain technologically sophisticated jobs, which are an emerging part of the global economy. In this paper we adopt social capital as a framework for examining the influence of family and community on promoting educational achievement among public school students. We explore more fully the role of community social capital in influencing educational performance beyond that attributed to family social capital. Using data from the National Education Longitudinal Survey (NELS), we find that both process and structural attributes of family social capital are key factors affecting high school students' educational achievement. Process and structural attributes of community social capital also help youths to excel, though they contribute less strongly to achievement. These findings suggest that policies designed to promote educational achievement must extend beyond the school and must seek to strengthen social capital in the family and the community.     

Power to the people—health PR people that is!

Inspired by the seminal typology of power first suggested by French and Raven, this study identified five types of power (Expert, Information Reward, Information Coercive, Advertising Coercive, and Influence Powers) that health public relations practitioners believed they have in media relations. This study also examined the effect of four variables, such as personal closeness with reporters, openness towards the media, perceived media job performance, and perceived expertise in the health field, on these five types of perceived power. The results suggested that public relations practitioners who highly evaluate themselves as an expert in health and as a competent media communicator, and who are personally close with reporters have greater Expert Power in media relations. Also, when practitioners are personally close to reporters, they are more likely to use Information Reward Power.     

Boundary Violations and the Abuse of Power: Commentary on Paper by Philip Kuhn

Kuhn describes a sordid event in the life of Ernest Jones. Although the episode involves a school setting rather than a psychoanalytic process, the incident has remarkable similarities to the boundary violations so prevalent in the early history of psychoanalysis. A detailed examination of the institutional response to the allegations illuminates our persistent wish to deny abuses of power, the pervasiveness of corruption in our analytic parents, and the misuses of sexual desire in our midst.     

On the Non-attainability of Chebyshev Bounds

In this department The American Statistician publishes articles, reviews, and notes of interest to teachers of the first mathematical statistics course and of applied statistics courses. The department includes the Accent on Teaching Materials section; suitable contents for the section are described under the section heading. Articles and notes for the department, but not intended specifically for the section, should be useful to a substantial number of teachers of the indicated types of courses or should have the potential for fundamentally affecting the way in which a course is taught.     

Pathways to the All-Volunteer Military

OBJECTIVES: The present study investigates the role of a disadvantaged background, the lack of social connectedness, and behavioral problems in channeling young men to the opportunities of the all-volunteer military instead of to college and the labor market. METHODS: Data from three waves of the National Longitudinal Study of Adolescent Health in the United States. The analytic sample consists of 6,938 white, black, and other males. RESULTS: The greatest likelihood of military service versus college and the labor force occurs when young men of at least modest ability come from disadvantaged circumstances, experience minimal connectedness to others, and report a history of adolescent fighting. DISCUSSION: Findings suggest the importance of access to post-high school education and worklife opportunities as a military service incentive for less advantaged young men in the all volunteer era.     

Linking early social risks to impaired physical health during the transition to adulthood

The present longitudinal study of 485 youth used structural equation models to investigate the ways in which a combination of social disadvantage in the family of origin and adolescent maladjustment increases risk for physical health difficulties during adulthood. The study examined a theoretical model that proposes that disruptions in the transition to adulthood mediate the effect of earlier social disadvantage and adolescent maladjustment on young adult physical health status. Results show that early risk factors initiate a sequence of negative influences on young adult physical health through early entry into family responsibility, truncated educational attainment, and poor occupational and economic status. These associations prevailed even after controlling for physical health status during adolescence.     

Important Yet Ignored: Problems of 'Expertise' in Emergency Duty Social Work

Summary This paper deals with the important role that emergency dutyworkers play in respect of the variety of situations that arereferred to them outside of the normal working hours of socialservices departments. The first section presents some interimoutcomes of ongoing research suggesting that the variabilityof priorities and assessments made by such workers is even greaterthan might be intuitively expected. The paper questions whetherconventional expectations of social work assessment are applicablein circumstances that are radically different from day-timework. In the second section, the paper explores the evidentmoral dilemmas contained in these circumstances, highlightingthe need for workers to have internalized as ‘expert’as broad a grasp as possible of the diversity of values andmethods of social assessment, decision-making and intervention.The paper continues by considering the nature of expert methodssuitable for the demands of emergency duty work, the need forguidelines for professional judgement, and an appropriate genericframework.