Each volume includes author's previously published papers. / Bibliography: leaves 147-151 (v. 1). / 3 v. : / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Thesis (D.Sc.)--University of Adelaide, School of Mathematical Sciences, 2005

Thesis (M.Info.Sys.)--University of Wollongong, 2004. / Typescript. Includes bibliographical references: leaf 110-116.

Thesis (Ph.D.)--University of Melbourne, School of Philosophy, Anthropology and Social Inquiry, 2009. / Typescript. Includes bibliographical references (p. 201-207)

This research program investigated the reasonable possibility that differential information processing strategies can be manifestations of racist prejudgments. Our research design applies a technique often used in social cognition studies. This technique captures evidence of a rather habit-driven (though not instantaneous) decision made by subjects rapidly presented with information about (typically fictional) characters. These target characters are associated (in the context of the experiment) with some form of generalized expectancy (i.e., they are typically presented as a likable or unlikable person). This is accomplished either by creating the expectancy artificially, or by using targets that are members of a conspicuously or notably-stereotyped group. The rather non-conscious decision involved is one of either bolstering one's pre-conceived notions or engaging in inconsistency resolution (e.g., either marshaling evidence to bolster your prejudicial expectation or pondering more earnestly those pieces of information which are inconsistent with your expectancy or well-known prejudicial stereotypes). Typically, the likelihood of pursuing one strategy or the other is manipulated in experimental settings by first providing an artificial expectation, then altering the structure of the person-memory task or adjusting the rate of information flow to the subjects. We hoped to reveal how a non-artificial pre-existing race-based prejudicial expectancy (of a largely non-evaluative as in non-likable/dislikable nature) might effect the pursuit of one strategy or the other. By and large, tests of our five hypotheses provide only mixed support for use of a person-memory associative network model in this context. The first and second hypotheses have some visual support (i.e., recall proportions across sentence types start out roughly equal for low prejudicial expectation - PE -- subjects then branch out; high PE subjects seem to treat sentence types differently from the start); however, these differences are not amenable to clearly interpretable statistical tests. Analysis of the third and fourth hypotheses was confounded because the candidate contaminating covariate failed to have consistent effects. This, coupled with the floor effect of the PE scale, the unexplained (and substantial) variability in recall behavior, and some other control issues (detailed below), made the use of the continuous DVs less than fruitful. The floor effect of the PE scale was especially problematic - with many subjects compressed at this floor, relations would be difficult to see even if present. In an attempt to detect weak effects of prejudice, we aggregated subjects by PE (as in high and low prejudice). Aggregation probably made the floor effect-driven range restriction less problematic (the subjects lumped together on PE's floor are probably less-afflicted with well-practiced prejudicial expectations than the high half of PE scorers). This exercise generated weak support for the third hypothesis: the time interval data feebly indicates that high PE subjects manifest a negative impression-centered person-memory schema in their storage of sentences about a Black target - and, unlike the low PE subjects, they apparently do this starting with the earliest blocks of sentences. The median split approach failed to generate support for the fourth hypothesis - where we expected to see bolstering replace inconsistency resolution (in the slow condition) since subjects were afforded the time. There was weak evidence, however, that more inconsistency resolution was occurring in the fast condition (as the proposed model had predicted). This evidence was in the form of greater recall time interval differences seen when comparing high PE subjects and their schema-speeded versus non-speeded intervals. The bottom line for the first four hypotheses is still this: we failed to create a condition where prejudice would paradoxically favor recall of laudable or admirable inconsistencies associated with a fictitious Black target. The fifth hypothesis was just intended to verify that racial prejudice does not predict recall behavior when the target is White and so are the subjects. So using a White target, we performed the same sort of tests seen above. Fortunately, relations with PE ranged from weak to very weak - and, of course, were non-significant. In sum, these outcomes suggest that Hastie-Srull associative network (H-SAN) processing effects may not reliably or consistently manifest themselves in the prejudiced rater/performance appraisal arena -- at least not in designs similar to those used previously to illustrate H-SAN effects. There were some clear exceptions, however, in our data. Taken together, our results suggest that H-SAN mechanisms may apply when appraising performance potential, but have a difficult time manifesting themselves in substantial ways. / Ph. D.

Conflicting information in an agent's knowledge base may lead to a semantical defect, that is, a situation where it is impossible to draw any plausible conclusion. Finding out the reasons for the observed inconsistency and restoring consistency in a certain minimal way are frequently occurring issues in the research area of knowledge representation and reasoning. In a seminal paper Raymond Reiter proves a duality between maximal consistent subsets of a propositional knowledge base and minimal hitting sets of each minimal conflict -- the famous hitting set duality. We extend Reiter's result to arbitrary non-monotonic logics. To this end, we develop a refined notion of inconsistency, called strong inconsistency. We show that minimal strongly inconsistent subsets play a similar role as minimal inconsistent subsets in propositional logic. In particular, the duality between hitting sets of minimal inconsistent subsets and maximal consistent subsets generalizes to arbitrary logics if the stronger notion of inconsistency is used. We cover various notions of repairs and characterize them using analogous hitting set dualities. Our analysis also includes an investigation of structural properties of knowledge bases with respect to our notions. Minimal inconsistent subsets of knowledge bases in monotonic logics play an important role when investigating the reasons for conflicts and trying to handle them, but also for inconsistency measurement. Our notion of strong inconsistency thus allows us to extend existing results to non-monotonic logics. While measuring inconsistency in propositional logic has been investigated for some time now, taking the non-monotony into account poses new challenges. In order to tackle them, we focus on the structure of minimal strongly inconsistent subsets of a knowledge base. We propose measures based on this notion and investigate their behavior in a non-monotonic setting by revisiting existing rationality postulates, and analyzing the compliance of the proposed measures with these postulates. We provide a series of first results in the context of inconsistency in abstract argumentation theory regarding the two most important reasoning modes, namely credulous as well as skeptical acceptance. Our analysis includes the following problems regarding minimal repairs: existence, verification, computation of one and characterization of all solutions. The latter will be tackled with our previously obtained duality results. Finally, we investigate the complexity of various related reasoning problems and compare our results to existing ones for monotonic logics.

Les recherches sur le vieillissement ont montré que la variabilité intra-individuelle (VII) du fonctionnement cognitif (dispersion et inconsistance) augmente avec l’âge. La VII pourrait jouer un rôle central dans la compréhension des changements cognitifs observés chez la personne âgée. Le but de cette recherche a été d’évaluer l’apport de la VII pour expliquer les différences d’efficience cognitive entre personnes âgées. Les relations entre deux formes de VII, dispersion (VII des scores entre plusieurs tests cognitifs) et inconsistance (VII des temps de réponse (TR) entre les essais à une tâche de contrôle cognitif), et l’efficience cognitive, ont été évaluées auprès d’un groupe d’adultes âgés de 61 ans et plus. La tâche de contrôle AX-cpt utilisée dans cette étude permet l’évaluation de processus de contrôle cognitif distincts (contrôle réactif et contrôle proactif). L’augmentation de la dispersion était associée à une diminution de la vitesse de traitement, de la capacité de la mémoire épisodique et de l’état cognitif plus général. L’augmentation de l’inconsistance semble traduire une difficulté supérieure associée à des capacités de maintien de l’information contextuelle et de résistance à l’interférence moins préservées. Toutefois, l’inconsistance pourrait exprimer une évolution positive de la cognition. Les fluctuations intra-individuelles du comportement paraissent être les caractéristiques d’un fonctionnement normal. L’irrégularité de l’instabilité temporelle des TR aux essais successifs d’une même tâche semble être un indicateur pertinent dans l’étude de la VII pour rendre compte d’une diminution de l’efficience cognitive. L’étude de la VII de la performance semble donc être une approche fructueuse pour expliquer la variabilité interindividuelle chez la personne âgée et prédire d’éventuels changements cognitifs / Aging research shows an age-related increase in intraindividual variability in cognitive functioning (dispersion and inconsistency). Intraindividual variability would play a central role in understanding cognitive changes in older adults. The purpose of the present research was to examine the contribution of the intraindividual variability study, in order to explain differences in cognitive efficiency between older adults. The relationship between two forms of intraindividual variability, dispersion (variability in scores across several cognitive tests) and inconsistency (variability in response time (RT) across trials in a cognitive control task), and the cognitive efficiency, was estimated in a sample of adults aged from 61 years and older. The control task AX-cpt used in this study allows the evaluation of distinct cognitive control process (proactive and reactive control). The increase in dispersion was associated with a decrease in processing speed, episodic memory ability and the more general cognitive state. The increase in inconsistency seems related to a difficulty of a cognitive system whose capacities of context information maintenance, and resistance to interference, are less preserved. However, the inconsistency could also reveal a positive evolution of cognition. Intraindividual fluctuations in behavior appear to be the characteristics of normal functioning. The irregularity of temporal instability of successive trials response times, seems to be a valid cue of the decrease in cognitive efficiency. The study of intraindividual variability in performance seems to be a fruitful approach to explain the variability between individuals observed in the elderly, and to predict possible cognitive changes.

The aim of this thesis is to study the role played by negation in databases and to develop data models that can handle inconsistent and incomplete information. We develop models that also allow incompleteness through disjunctive information under both the CWA and the OWA in relational databases. In the area of logic programming, extended logic programs allow explicit representation of negative information. As a result, a number of extended logic programs have an inconsistent semantics. We present a translation of extended logic programs to normal logic programs that is more tolerant to inconsistencies. Extended logic programs have also been used widely in order to compute the repairs of an inconsistent database. We present some preliminary ideas on how source information can be incorporated into the repair program in order to produce a subset of the set of all repairs based on a preference for certain sources over others.

The purpose of this study is to analyze the effect of CBI-reforms on inflation in different parts of the world from a theoretical and empirical perspective. Compared to previous studies, this study focuses on whether CBI-reforms have different effects on reducing inflation in different parts of the world. The study is based on a 132 country data-set from 1980 to 2005 compiled by Daunfeldt et al. (2008). The result indicates that the reduction in inflation due to the CBI-reforms varies between 2.2 and 12.32 percentage points in Asia, Europe, South America and Oceania, supporting the claim that implementing CBI-reforms can be successful in reducing inflation in most of the parts of the world.

Bibliography: leaves 263-266. / v, 266 leaves ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / This thesis investigates two related aspects of a dualisation program for the intuitionist logic in categories. The dualisation program has as its end the presentation of closed set logic in place of the usual open set logic found in association with toposes. The study is concerned especially with Brouwerian algebras in categories as the duals of the usual Heyting algebras. Defines the notion of a sheaf over the closed sets of a topological space. Investigates the sheaves for their algebric properties in relation to base space topologies. / Thesis (Ph.D.)--University of Adelaide, Dept. of Philosophy, 1996

Bibliography: leaves 263-266. / v, 266 leaves ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / This thesis investigates two related aspects of a dualisation program for the intuitionist logic in categories. The dualisation program has as its end the presentation of closed set logic in place of the usual open set logic found in association with toposes. The study is concerned especially with Brouwerian algebras in categories as the duals of the usual Heyting algebras. Defines the notion of a sheaf over the closed sets of a topological space. Investigates the sheaves for their algebric properties in relation to base space topologies. / Thesis (Ph.D.)--University of Adelaide, Dept. of Philosophy, 1996