Transformation- and label-invariant neural network for the classification of landmark data

One method of expressing coarse information about the shape of an object is to describe the shape by its landmarks, which can be taken as meaningful points on the outline of an object. We consider a situation in which we want to classify shapes into known populations based on their landmarks, invariant to the location, scale and rotation of the shapes. A neural network method for transformation-invariant classification of landmark data is presented. The method is compared with the (non-transformation-invariant) complex Bingham rule; the two techniques are tested on two sets of simulated data, and on data that arise from mice vertebrae. Despite the obvious advantage of the complex Bingham rule because of information about rotation, the neural network method compares favourably.     

Introducing strategic management

This is a report on the International Conference on Strategic Management, held at Vanderbilt Graduate School of Management (14–18 May 1973). At the conference, senior academics, businessmen and consultants from fifteen countries met to discuss the problems of implementing strategic planning.     

AIDS Exceptionalism: On the Social Psychology of HIV Prevention Research

The current analysis considers the  human immunodeficiency virus (HIV)  prevention research record in the social sciences. We do so with special reference to what has been termed "AIDS Exceptionalism"—departures from standard public health practice and prevention research priorities in favor of alternative approaches to prevention that, it has been argued, emphasize individual rights at the expense of public health protection. In considering this issue, we review the historical context of the HIV epidemic; empirically demonstrate a pattern of prevention research characterized by systematic neglect of prevention interventions for HIV-infected persons; and articulate a rationale for "Prevention for Positives," supportive prevention efforts tailored to the needs of HIV+ individuals. We then propose a social psychological conceptualization of processes that appear to have influenced developments in HIV prevention research and directed its focus to particular target populations. Our concluding section considers whether there are social and research policy lessons to be learned from the record of HIV prevention research that might improve our ability to address effectively, equitably, and in timely fashion future epidemics that play out, as HIV does, at the junction of biology and behavior.     

Stochastic models of geriatric patient bed occupancy behaviour

This paper considers a census approach to the modelling of the time that geriatric patients spend in hospital and subsequently in the community by using a stochastic compartmental Markov model. A selection process is developed using maximum likelihood estimation to fit the model to daily census data on the duration spent in the hospital or the community. Census data are used as they are easy to collect and therefore maximize the usability of the model. The model is fitted to an extensive 16-year data-set and shown to provide realistic estimates of movements of patients by using only a single day's census result.     

Empowerment, Identity and Participatory Research: using social action research to challenge isolation for deaf and hard of hearing people from minority ethnic communities

This paper considers the practice of empowerment within a social action approach, and the importance of an analysis of issues of identity, for an understanding of the experience of individuals and their communities. The discussion is grounded in the experience of conducting a research project on the 'needs of deaf and hard of hearing people from minority ethnic communities', living in the London Borough of Merton. The theme of 'isolation' is taken as a focus for the discussion. It was identified by respondents to be of central importance to an understanding of their experience. The Social Model of Disability and the concept of Deaf Culture are used to explore the complex set of relationships that characterise the day-to-day reality for deaf and hard of hearing people from minority ethnic communities, and recommendations are made to assist researchers and service providers in developing a more empowering practice.     

The Role of Debt Contracts in UK Corporate Governance

The model of managerial incentives used in Positive Accounting Theory sees debt contracts as important in accounting choices in firms. The paper argues that agency theory and costly contracting theory imply a much wider role for debt contracts as corporate governance mechanisms for controlling relationships between lenders and firms. We analyse the creditor's problem in providing debt to the firm in terms of anticipated agency costs. This analysis leads to a consideration of contracting solutions involving the choice of debt contract terms providing credit protections which are efficient in agency cost and contracting cost terms.The model of debt contracts accepted in the literature is based upon US research, both theoretical and empirical, and thus reflects US institutional experience. This model involves detailed bonding and monitoring terms focusing upon financial and other covenants and implies customisation of such terms to meet creditors' contracting requirements. The paper reviews evidence on the applicability of this model in practice and concludes that, despite broad similarities, institutional biases are present if the model is applied to countries other than the US. We examine evidence on UK debt contracting practices, in particular contract form and content, types of covenant, lenders' perceptions of the role of covenants as control mechanisms, and the issue of standardisation versus customisation. The paper identifies important differences in debt contracting in the UK, for example in types of covenants and the role perceived for them by creditors and identifies standardisation in contract terms as being more common than often implied by other research.     

Feminist Methodology in Social Movements Research

Feminist social scientists have developed distinctive principles of inquiry that depart from the positivist ideal of the detached, value-free scientist and are consistent with the feminist goal of rendering women's experiences visible and challenging gender inequality. In this article, I show how my research on the postpartum depression self-help movement illustrates five features of feminist methodology: a gender perspective, accentuation of women's experiences, reflexivity, participatory methods, and social action. My intent is to demonstrate how attention to the epistemological and methodological questions posed by feminist researchers produces new standards of evidence that allow us to recognize the gendering of social movement processes and theory.