The interval between sexual encounters affects male courtship tactics in a desert-dwelling fish

Courtship displays are often important in determining male mating success but can also be costly. Thus, instead of courting females indiscriminately, males might be expected to adjust their signalling effort strategically. Theory, however, predicts that such adjustments should depend on the rate with which males encounter females, a prediction that has been subject to very little empirical testing. Here, we investigate the effects of female encounter rate on male courtship intensity by manipulating the time interval between sequential presentations of large (high quality) and small (low quality) females in a fish, the Australian desert goby Chlamydogobius eremius. Males that were presented with a small female immediately after a large female reduced their courtship intensity significantly. However, males courted large and small females with equal intensity if the interval between the sequential presentations was longer. Our results suggest that mate encounter rate is an important factor shaping male reproductive decisions and, consequently, the evolutionary potential of sexual selection.

Ranking method for optimizing precision/recall of content-based image retrieval

The ranking method is a key element of Content-based Image Retrieval (CBIR) system, which can affect the final retrieval performance. In the literature, previous ranking methods based on either distance or probability do not explicitly relate to precision and recall, which are normally used to evaluate the performance of CBIR systems. In this paper, a novel ranking method based on relative density is proposed to improve the probability based approach by ranking images in the class. The proposed method can achieve optimal precision and recall. The experiments conducted on a large photographic collection show significant improvements of retrieval performance.

Defining educational research : a perspective of/on presidential addresses and the Australian Association for Research in Education

This paper is concerned with the definition of the field of educational research and the changing and developing role of the Australian Association for Research in Education (AARE) in representing and constituting this field. The evidence for the argument is derived from AARE Presidential Addresses across its 40-year history. The paper documents the enhanced complexity and diversity of the field over these 40 years, including the emergence of a global educational policy field, theoretical and methodological developments in the social sciences and new research accountabilities such as the Excellence in Research for Australia (ERA) measure. Specifically, the paper suggests that the evidence-based movement in public management and education policy, and the introduction of the ERA, potentially limit and redefine the field of educational research, reducing the usefulness and relevance of educational research to policy makers and practitioners. This arises from a failure to recognise that Education is both a field of research and a field of policy and practice. Located against both developments, the paper argues for a principled eclecticism framed by a reassessment of quality, which can be applied to the huge variety of methodologies, theories, epistemologies and topics legitimately utilised and addressed within the field of educational research. At the same time, the paper argues the need to globalise the educational research imagination and deparochialise educational research. This call is located within a broader argument suggesting the need for a new social imaginary (in a post-neoliberal context of the global financial crisis) to frame educational policy and practice and the contribution that educational theory and research might make to its constitution. In relation to this, the paper considers the difficulties that political representations of such a new imaginary might entail for the President and the Association, given the variety of its membership and huge diversity of its research interests.

The emergent structure of feeling : what does it mean for critical educational studies and research?

Critical research in education is not what it used to be. It must now engage with a differently structured and globalized world with different social and material conditions for its peoples. This paper sets out to name the contemporary structure of feeling in which education researchers now work, particularly in terms of what now is to be the object of their educational theorizing and research and what are to be the intellectual resources brought to bear on such activity. The intention is to open up debate, recognizing that there are no easy answers and yet acknowledging the need for answers to be attempted. It is, therefore, an invitation premised on an optimism of the will to complement legitimate pessimism of the intellect. It concludes that a critical engagement with these matters demands a modernist/postmodernist, reconstructive/deconstructive reflexivity in the mobilizing of a new sociological imagination applied across the broad spectrum which is educational research.

Theorizing normalization as hidden privilege

This chapter provides a theoretical overview of some of the ways in which the process of normalization functions as forms of hidden privilege. It outlines how privileged groups come to represent the dominant norm whereby white, male, able-bodied, heterosexual, middle-class people in Western societies come to embody what it means to be normal. It also explores strategies for challenging the normalization of privilege by encouraging the development of responsibility not only for individual actions but also for the social practices which create them.

Men in social work : challenging or reproducing an unequal gender regime?

This article is concerned with the reproduction of gender inequality in social work and the extent to which the presence of men in the profession challenges discriminatory processes and occupational segregation. Although it is argued that men need to take more responsibility for caring roles in professions like social work, many of the rationales for encouraging more men to enter social work are unlikely to support alternative masculinities that will challenge gender inequalities. Only a profeminist commitment informing antisexist practices will enable men to address gender inequality in social work.