Lay and Expert Interpretations of Cancer Cluster Evidence

Conflict frequently occurs between community members and environmental/public health officials when an unusual number of cancer cases is reported. This conflict may result from different ways in which laypeople and experts interpret facts to judge whether there is an environmental cause of the cancer cases, but little is known about this issue. Volunteer laypeople (N= 551) and epidemiologists (N= 105) read a hypothetical scenario about cases of cancer on one neighborhood block. Participants judged whether each of the 23 facts about the situation made it “much more likely” to “much less likely” that something in town was causing the cancer cases (7‐point scale). The facts were designed to be “alarming,”“reassuring,” or “neutral” (i.e., according to epidemiological principles, should increase, decrease, or have no impact on the likelihood of an environmental cause). The laypeople were alarmed by most of the facts (mean response significantly greater than the scale midpoint), including all of the neutral facts and over half of the reassuring facts. The experts were more balanced: they were alarmed by none of the neutral or reassuring facts. Their responses showed significantly less alarm than the laypeople's responses (p < 0.0001 for all comparisons). This study reveals that laypeople are not reassured by information that substantially lowers the chance of an environmental cause for cancer cases. Lay responses differ significantly and systematically from experts who are far less alarmed by relevant facts. These findings may help explain the conflicts between the two groups in situations where concern about cases of cancer arises in a community.     

Issues in end-of-life product recovery and reverse logistics

There is a fundamental shift in waste management responsibility from the private waste management industry and local governments towards manufacturers, distributors, and retailers. In recent years the responsibility of manufacturers has been extended to cover the entire life of certain products. This also includes responsibility for the products safe disposal. As the enforcement of environmental legislation becomes more stringent and an increasing number of customers are demanding take-back of their old products, companies are beginning to focus on possible distribution channels for the return of their products i.e. reverse logistics. The aim of this paper is to examine the emerging issues in reverse logistics, in particular the information requirements for reverse logistics within the Extended Enterprise. A study of end-of-life vehicles (ELVs) will illustrate the specific information flow between the key players within the automotive industry. This paper addresses the initial development of possible distribution channels, their key operational decisions and supporting information systems for the recycling of end of life products.     

How managers plan—the analysis of managers' activities

This paper analyzes the positions of Mintzberg and planning experts on the extent to which managers plan and the importance of planning to management. Mintzberg contends that managers do not plan. The ‘planning literature’ contends that planning leads to effective management. In a replication of Mintzberg's study, the authors found support for the planning literature's position. The discrepancy between Mintzberg and the planning literature is explained by the shortcomings of the observational method used by Mintzberg. A suggested modification of Mintzberg's method is given.     

SCHOOLING THE INFORMATION SOCIETY? The place of the information superhighway in education

Despite a history of educational resistance to technology, the internet and, in turn, the information superhighway, have been popularly heralded as having the potential to transform schools the world over. In doing so there has been a conspicuous lack of critical examination of the information superhighway's role in education. This article therefore contrasts popular conceptions of the 'educational' superhighway with the likely social and cultural implications of the 'wired' school. From this perspective the article first examines three central claims that are popularly made about the information superhighway in education: namely, the unbridled access to information it will afford teachers and learners; the potential for interactive communication with other individuals; and the equality it will imbue. These popular discourses are then contrasted with two fundamental characteristics of the information superhighway which are often overlooked by its advocates: the different quality of learning experienced 'on-line' and the educational implications of the inherent economic nature of the emerging information superhighway. The article then concludes by suggesting an alternative approach to examining the implementation of the information superhighway in an educational context.     

Desired Characteristics of Spouses and Best Friends: Do They Differ by Sex and/or Gender?

In view of the salutary effects that having one's spouse as one's best friend are said to impart (G. R. Lee 1988; Schwartz 1994), we investigated the relationship between desired characteristics of a best friend and of a spouse. Consistent with earlier scholarship in this area, we found that desired characteristics overlap considerably for those two roles. We also found that men's and women's selection of characteristics are highly similar and that having a current same-sex or cross-sex best friend did not modify the characteristics chosen for either best friends or spouses. We discuss these findings in terms of the trend toward nontraditional gender role identities and expectations in close relationships.     

From service to social control: Implications of welfare reform for professional practice in the United States

In response to the explosive growth and the changing demographic composition of public welfare recipients, this program has undergone four major reforms over the last three decades: the 1962 'Service' amendments, the 1967 Work Incentive program (WIN), the Family Support Act of 1988, and the 1996 program of Temporary Assistance to Needy Families (TANF). These reforms have had a profound impact not only on the scope and purpose of public assistance to needy families, but also on the nature of professional social work practice in this area of public social service. An analysis of the major welfare reforms over the last 35 years reveals how the national entitlement to income maintenance and social services has receded, local responsibility and private delivery of service have increased, and emphases on service functions have shifted from rehabilitative social casework/counselling to work-oriented training, job search activities, and local employment. The provision of public assistance has been transformed from a federal entitlement based on needs to a budget-driven-time-limited benefit enveloped by incentives and sanctions, with welfare clients increasingly subject to mandatory participation in work-related activities. This movement from welfare to workfare has infused the professional role of social workers with a steadily expanding function of social control, which is unlikely to encourage professional participation in the public social services.     

Meeting the training needs of GP registrars in child abuse and neglect

A questionnaire survey undertaken among general practitioner registrars in North Thames in 1998 revealed significant deficiencies in their child protection training. A minority expressed confidence at the prospect of dealing with child protection cases in the future. A new, interactive training package was subsequently developed and delivered to a sample of GP registrars in Northeast Thames in 1999. Preliminary evaluation confirmed that the new training material was sensitive to the needs of recipients and levels of perceived confidence with participation in child protection work were increased. Further work is needed to develop the package and to oversee its successful incorporation into general practitioner vocational training. Copyright © 2001 John Wiley & Sons, Ltd.     

Designing Realized Kernels to Measure the ex post Variation of Equity Prices in the Presence of Noise

This paper shows how to use realized kernels to carry out efficient feasible inference on the ex post variation of underlying equity prices in the presence of simple models of market frictions. The weights can be chosen to achieve the best possible rate of convergence and to have an asymptotic variance which equals that of the maximum likelihood estimator in the parametric version of this problem. Realized kernels can also be selected to (i) be analyzed using endogenously spaced data such as that in data bases on transactions, (ii) allow for market frictions which are endogenous, and (iii) allow for temporally dependent noise. The finite sample performance of our estimators is studied using simulation, while empirical work illustrates their use in practice.     

Approximations to Optimal k‐Unit Cycles for Single‐Gripper and Dual‐Gripper Robotic Cells

We consider the problem of scheduling operations in bufferless robotic cells that produce identical parts using either single‐gripper or dual‐gripper robots. The objective is to find a cyclic sequence of robot moves that minimizes the long‐run average time to produce a part or, equivalently, maximizes the throughput. Obtaining an efficient algorithm for an optimum k‐unit cyclic solution (k ≥ 1) has been a longstanding open problem. For both single‐gripper and dual‐gripper cells, the approximation algorithms in this paper provide the best‐known performance guarantees (obtainable in polynomial time) for an optimal cyclic solution. We provide two algorithms that have a running time linear in the number of machines: for single‐gripper cells (respectively, dual‐gripper cells), the performance guarantee is 9/7 (respectively, 3/2). The domain considered is free‐pickup cells with constant intermachine travel time. Our structural analysis is an important step toward resolving the complexity status of finding an optimal cyclic solution in either a single‐gripper or a dual‐gripper cell. We also identify optimal cyclic solutions for a variety of special cases. Our analysis provides production managers valuable insights into the schedules that maximize productivity for both single‐gripper and dual‐gripper cells for any combination of processing requirements and physical parameters.