Information sharing between heterogeneous uncertain reasoning models in a multi-agent environment : a case study

The issue of information sharing and exchanging is one of the most important issues in the areas of artificial intelligence and knowledge-based systems (KBSs), or even in the broader areas of computer and information technology. This paper deals with a special case of this issue by carrying out a case study of information sharing between two well-known heterogeneous uncertain reasoning models: the certainty factor model and the subjective Bayesian method. More precisely, this paper discovers a family of exactly isomorphic transformations between these two uncertain reasoning models. More interestingly, among isomorphic transformation functions in this family, different ones can handle different degrees to which a domain expert is positive or negative when performing such a transformation task. The direct motivation of the investigation lies in a realistic consideration. In the past, expert systems exploited mainly these two models to deal with uncertainties. In other words, a lot of stand-alone expert systems which use the two uncertain reasoning models are available. If there is a reasonable transformation mechanism between these two uncertain reasoning models, we can use the Internet to couple these pre-existing expert systems together so that the integrated systems are able to exchange and share useful information with each other, thereby improving their performance through cooperation. Also, the issue of transformation between heterogeneous uncertain reasoning models is significant in the research area of multi-agent systems because different agents in a multi-agent system could employ different expert systems with heterogeneous uncertain reasonings for their action selections and the information sharing and exchanging is unavoidable between different agents. In addition, we make clear the relationship between the certainty factor model and probability theory.

Situational and dispositional indicators of performance : competing models in education

The attainment of high grades on the Victorian Certificate of Education (VCE) is critical to the future study and employment prospects of many Australian adolescents. Thus it is important to understand the factors that contribute to performance in the VCE. The aims of this study were twofold: the main aim was to test competing models of academic performance, subsuming a range of situational and dispositional variables based on a) self-efficacy theory, b) target and purpose goals, c) cognitive skills and self-regulatory strategies, and d) positive psychology. These models were each tested in terms of English performance and mathematics performance as these units contribute proportionally the most to overall VCE scores. In order to study whether pressures peculiar to the VCE impact on performance, the competing models were tested in a sample of Victorian students prior to the VCE (year 10) and then during the VCE (year 11). A preliminary study was conducted in order to develop and test four scales required for use in the major study, using an independent sample of 302 year nine students. The results indicated that these new scales were psychometrically reliable and valid. Three-hundred and seven Australian students participated in the year 10 and 11 study. These students were successively asked to provide their final years 9, 10 and 11 English and mathematics grades at times one, three and five and to complete a series of questionnaires at times two and four. Results of the year 10 study indicated that models based on self-efficacy theory were the best predictors of both English and mathematics performance, with high past grades, high self-efficacy and low anxiety contributing most to performance. While the year 10 self-efficacy models, target goal models, positive psychology models, self-regulatory models and cognitive skill based models were each robust in the sample in year 11, a substantial increase in explained variance was observed from year 10 to year 11 in the purpose goal models. Results indicated that students’ mastery goals and their performance-approach goals became substantially more predictive in the VCE than they were prior to the VCE. This result can be taken to suggest that these students responded in very instrumental ways to the pressures, and importance, of their VCE. An integrated model based on a combination of the variables from the competing models was also tested in the VCE. Results showed that these models were comparable, both in English and mathematics, to the self-efficacy models, but explained less variance than the purpose goal models. Thus in terms of parsimony the integrated models were not preferred. The implications of these results in terms of teaching practices and school counseling practices are discussed. It is recommended that students be encouraged to maintain a positive outlook in relation to their schoolwork and that they be encouraged to set their VCE goals in terms of a combination of self-referenced (mastery) and other-referenced (performance-approach) goals.

Ways in which theory and practice are integrated in the pre-service teacher education practicum

This paper reports on a study into pre-service teachers’ perceptions about their professional development during practicum. The study examined to what extent, and how effectively, one group of pre-service teachers was able to integrate theory and practice during a three-week practicum in the first year of their degree. Data for this mixed methods study were drawn from one cohort of first-year students undertaking the Master of Teaching (MTeach), a graduate-level entry program in the Faculty of Education at an urban Australian university. Although there is a strong field of literature around the practicum in pre-service teacher education, there has been a limited focus on how pre-service teachers themselves perceive their development during this learning period. Further, despite widespread and longstanding acknowledgement of the “gap” between theory and practice in teacher education, there is still more to learn about how well the practicum enables an integration of these two dimensions of teacher preparation. In presenting three major findings of the study, this paper goes some way in addressing these shortcomings in the literature. First, opportunities to integrate theory and practice were varied, with many participants reporting supervision and scheduling issues as impacting on their capacity to effectively enact theory in practice. Second, participants’ privileging of theory over practice, identified previously in the literature as commonly characteristic of the pre-service teacher, was found in this study to be particularly prevalent during practicum. Third, participants overwhelmingly supported the notion of linking university coursework assessment to the practicum as a means of bridging the gap between, on the one hand, the university and the school and, on the other hand, theory and practice. The discussion and consideration of findings such as those reported in this paper are pertinent and timely, given the ratification of both the National Professional Standards for Teachers and the Initial Teacher Education Program Standards by the Australian Federal Government earlier this year. Within a number of the seven Professional Standards, graduate teachers are required to demonstrate knowledge and skills associated with both the theory and practice of teaching and with their effective integration in the classroom. To be nationally accredited, pre-service teacher education programs must provide evidence of enabling pre-service teachers to acquire such knowledge and skills.

Teaching organisational theory in undergraduate management programmes: an exercise in facilitated theory testing for active experimentation

This paper argues that there is an opportunity to improve the way that social science theory is taught by introducing an exercise in facilitated theory testing through active experimentation. This paper describes a learning experience that enables students to discover the dynamic nature of theoretical discoveries. This idea is grounded in the notion that students will gain much from learning about and testing theory experientially using real world data. A data based exercise is outlined and illustrated to reveal a learning experience that provides an opportunity to improve the way social science is taught by linking theory to empirical data. We argue that this provides an opportunity to offer a more holistic learning experience for theory teaching. The paper will be of special interest to those teaching theory in management, commerce, business and organisational studies courses. It will also be of interest to a more general audience because it provides a framework that can be modified whenever forging a connection between theory and 'the real world' is a primary learning objective.

Excess and mimesis in organization theory: emancipation from within?

In organizational analysis it can be argued that 'radical separatism'—in the guise of the original 'agenda' for Radical Organization Theory (see Benson, 1977a; Burrell and Morgan, 1979; Clegg and Dunkerley, 1980) or more recently that for Critical Management Studies (see Alvesson and Willmott, 1992; Fournier and Grey, 2000; Casey, 2002; Grey, 2004)—has failed to breach the hegemony of functionalist orthodoxy, and notably so when it comes to practice. Given this failure, we speculate, upon the potential for a different emancipatory approach, one based theoretically on the fluid process of 'undecidability'. Unusually our approach attempts to undermine the conventions of functionalist organization theory from within. In brief, we speculate upon the adoption and enactment of Luce Irigaray's (1985, 1991) strategy of mimicry as a means to illuminate the notion of 'excess' in organization theory. To liberate the feminine, Irigaray mimics the symbolic representation of the female body to excess so as to expose the contradictions of phallocentric discourse. When applied to organization theory, this sees a deliberate mimicking of critiques of radical separatism so as to make explicit the latter's imprisonment within functionalism. Through excessive mimicking of the functionalists' critique, the radical/critical organization theorist may become cognizant of, but perhaps not so subjugated by, the hegemony of functionalist discourse.

The Impact of on-field success in attracting sport sponsorship

The focus of this research is to identify the perceptions that professional sports club managers have about the impact that on-field success has on the attractiveness of a sport organisation to a prospective sponsor. From a series of semi-structured in-depth interviews conducted with the sponsorship/marketing managers from seven Melbourne based Australian Football League (AFL) clubs, an analysis of the importance of on-field success as a precursor for sponsorship was determined. The interview schedule consisted of four phases and concluded with a scale to rate the relative importance of on-field performance. The results indicated that AFL Club Managers believe that the onfield performance of the team does have an impact, but it is largely associated with the media coverage that this on-field success provides. They also identified that in the sport of AFL on-field success is largely controlled by the AFL governing organisation.

Concepts of temporality in the theory of transference

This paper examines the temporal concepts that underlie the theory of transference in psychoanalysis. The paper reviews Freud's rejection of linear temporality as characteristic of unconscious thought in favour of regression, repetition, and deferred action. It then develops concepts drawn from Jacques Lacan's theory of the formation of the ego. Here, the biologically determined helplessness derived from the human prematurity of birth becomes transformed into an ego that anticipates subjective unity. The paper then moves on to the more complex theory of the temporality implied in subject formation, offered in Lacan's later theory of separation. Implications are drawn for the use and understanding of transference in the practice of psychoanalysis via clinical examples. In addition, Lacan's ideas on subject formation are proposed as an extension and clarification of previous psychoanalytic theories of development.

Overview of risk prediction models in cardiovascular disease research

Many risk prediction models have been developed for cardiovascular diseases in different countries during the past three decades. However, there has not been consistent agreement regarding how to appropriately assess a risk prediction model, especially when new markers are added to an established risk prediction model. Researchers often use the area under the receiver operating characteristic curve (ROC) to assess the discriminatory ability of a risk prediction model. However, recent studies suggest that this method has serious limitations and cannot be the sole approach to evaluate the usefulness of a new marker in clinical and epidemiological studies. To overcome the shortcomings of this traditional method, new assessment methods have been proposed. The aim of this article is to overview various risk prediction models for cardiovascular diseases, to describe the receiver operating characteristic curve method and discuss some new assessment methods proposed recently. Some of the methods were illustrated with figures from a cardiovascular disease study in Australia.