Cognitive structure and the use of social space

The tendency for many girls to be less proficient in mathematics than boys is accounted for by their anticipated family roles, i.e., by the cultural mandate that they be primarily committed to thegemeinschaft of the family. This encourages them to focus on the practical affairs of everyday life rather than to venture out to the hypothetical. Being tied to thegemeinschaft also means that they stay close to home, making less use of physical space, and therefore remaining inhibited in their spatial conceptualization. The restriction in the use of physical space together with their commitment to thegemeinschaft restricts their social space as well, i.e., helps keep their social relationships on a simple rather than on a complex level, thereby limiting their universalistic relationships in favor of particularistic ones. The three factors—concern with the practical, limited use of physical space, and the emphasis on particularistic relationships—combine to discourage the taste, and perhaps even the capacity, for the abstract thinking which is most needed in mathematics.

—N. K. Humphrey

     

TQM in health care: mistaken identity?

Total Quality Management is a powerful tool in health care today. The definition of quality improvement in the medical literature focuses on improving patient outcomes. However, most quality initiatives in the health care field focus on improving productivity, cost-effectiveness, market share, employee morale, and efficiencies of processes. This disparity between the medical definition of quality and the actual application of quality improvement may have the effect of alienating many physicians, the very people who must be involved. The semantics are important to address in a TQM initiative.     

Change in worker/nonworker ratios for women

Effects of age, birth year, and observation year on work behavior are estimated by minimum logit chi-square regression, using data from Current Population Surveys. Most of the observation-year effect is captured by indicators of the business cycle. Further, a model which permits the cycle effects to vary by age is preferred over any additive model. The ratio for young women is most depressed relative to that for older women when times are "good".     

No going back: A review of the literature on sustaining organizational change

Why do some organizational changes persist, while others decay? The sustainability of change can be defined broadly as the process through which new working methods, performance goals and improvement trajectories are maintained for a period appropriate to a given context. However, sustainability has received limited attention, although the concept reflects Lewin's concern with ‘refreezing’ ( Lewin. K. 1951 . Field Theory in Social Science: Selected Theoretical Papers by Kurt Lewin, UK edition published 1952, ed. D. Cartwright, London: Tavistock). In an uncertain environment, working practices that fail to adapt are targets for change, and stability has been regarded not as a condition to be achieved, but as a symptom of inertia, a problem to be solved. This paper reviews the emerging literature, seeking to develop a provisional model of the processes influencing change sustainability and decay, as a platform for further research. This review suggests that sustainability is dependent on multiple factors, at different levels of analysis: substantial, individual, managerial, financial, leadership, organizational, cultural, political, processual, contextual and temporal. The relative significance of those factors cannot be determined a priori, raising questions concerning the properties of the sustainability process with regard to different types of change in different contexts.     

A bayesian approach to the comparison of two means

A hierarchical Bayesian approach to the problem of comparison of two means is considered. Hypothesis testing, ranking and selection, and estimation (after selection) are treated. Under the hypothesis that two means are different, it is desired to select the population which has the larger mean. Expressions for the ranking probability of each mean being the larger and the corresponding estimate of each mean are given. For certain priors, it is possible to express the quantities of interest in closed form. A simulation study has been done to compare mean square errors of a hierarchical Bayesian estimator and some of the existing estimators of the selected mean. The case of comparing two means in the presence of block effects has also been considered and an example is presented to illustrate the methodology.     

Transport related social exclusion in New Zealand: Evidence and challenges

Abstract

People without functional access to a car in countries where private vehicles are the predominant form of transport are at a disadvantage. Alternative modes of travel in such settings often do not meet people's mobility needs, creating barriers to participation in work, education, social activities, sport and leisure, and to accessing basic goods and services. In New Zealand, private vehicles have long been prioritised as the mode of personal transport in land transport planning policy. However, this is beginning to change with policy objectives now including improvement of access and mobility for all, and reduction of social exclusion. Despite this there is very little evidence of the experiences of those with mobility or access problems in New Zealand. This article seeks to provide qualitative data about experiences of transport related social exclusion, the efficacy of alternative modes for people's mobility needs, the impacts of these difficulties on people's lives, and the policy implications of these findings.     

Characterizing the Risk of Infection from Mycobacterium tuberculosis in Commercial Passenger Aircraft Using Quantitative Microbial Risk Assessment

Quantitative microbial risk assessment was used to predict the likelihood and spatial organization of Mycobacterium tuberculosis ( Mtb ) transmission in a commercial aircraft. Passenger exposure was predicted via a multizone Markov model in four scenarios: seated or moving infectious passengers and with or without filtration of recirculated cabin air. The traditional exponential ( k  = 1) and a new exponential ( k  = 0.0218) dose-response function were used to compute infection risk. Emission variability was included by Monte Carlo simulation. Infection risks were higher nearer and aft of the source; steady state airborne concentration levels were not attained. Expected incidence was low to moderate, with the central 95% ranging from 10⁻⁶ to 10⁻¹ per 169 passengers in the four scenarios. Emission rates used were low compared to measurements from active TB patients in wards, thus a "superspreader" emitting 44 quanta/h could produce 6.2 cases or more under these scenarios. Use of respiratory protection by the infectious source and/or susceptible passengers reduced infection incidence up to one order of magnitude.     

Ecological Risk Assessment Framework for Low-Altitude Aircraft Overflights: I. Planning the Analysis and Estimating Exposure

An ecological risk assessment framework for low-altitude aircraft overflights was developed, with special emphasis on military applications. The problem formulation and exposure analysis phases are presented in this article; an analysis of effects and risk characterization is presented in a companion article. The intent of this article is threefold: (1) to illustrate the development of a generic framework for the ecological risk assessment of an activity, (2) to show how the U.S. Environmental Protection Agency's ecological risk assessment paradigm can be applied to an activity other than the release of a chemical, and (3) to provide guidance for the assessment of ecological risks from low-altitude aircraft overflights. The key stressor for low-altitude aircraft overflights is usually sound, although visual and physical (collision) stressors may also be significant. Susceptible and regulated wildlife populations are the major assessment endpoint entities, although plant communities may be impacted by takeoffs and landings. The exposure analysis utilizes measurements of wildlife locations, measurements of sound levels at the wildlife locations, measurements of slant distances from aircraft to wildlife, models that extrapolate sound from the source aircraft to the ground, and bird-strike probability models. Some of the challenges to conducting a risk assessment for aircraft overflights include prioritizing potential stressors and endpoints, choosing exposure metrics that relate to wildlife responses, obtaining good estimates of sound or distance, and estimating wildlife locations.     

Use of nonvitamin, nonmineral dietary supplements among college students.

The authors assessed the use of nonvitamin, nonmineral (NVNM) dietary supplements in a college population. They found that the use of NVNM dietary supplements among college students might be higher than that of other population groups and that the types of NVNM products they use differ from those used by an older population. Of the 272 students who completed the questionnaire, 48.5% reported they took an NVNM supplement during the past 12 months. The most frequently used NVNM products were echinacea, ginseng, and St John's wort. Of the 27 students who took NVNM products to promote weight loss, 81.5% had body mass index (BMI) values in the acceptable range. Eleven of the 19 participants who reported an adverse reaction to an NVNM supplement continued to take the products despite negative effects. Users and nonusers of NVNM supplements did not differ significantly by age, ethnicity, gender, perceived dietary adequacy, or by exercise patterns.