The rough sets feature selection for trees recognition in color aerial images using genetic algorithms

Selecting a set of features which is optimal for a given task is the problem which plays an important role in a wide variety of contexts including pattern recognition, images understanding and machine learning. The concept of reduction of the decision table based on the rough set is very useful for feature selection. In this paper, a genetic algorithm based approach is presented to search the relative reduct decision table of the rough set. This approach has the ability to accommodate multiple criteria such as accuracy and cost of classification into the feature selection process and finds the effective feature subset for texture classification . On the basis of the effective feature subset selected, this paper presents a method to extract the objects which are higher than their surroundings, such as trees or forest, in the color aerial images. The experiments results show that the feature subset selected and the method of the object extraction presented in this paper are practical and effective.

Students perceptions of learning outcomes from group-based, problem-based teaching and learning activities

Objective: A study aimed at exploring the variation in perceptions of learning outcomes reported by undergraduate nursing students enrolled in a problem-based learning subject in a pre-registration Bachelor of Nursing course (BN).
Method: Students were asked to respond to four open-ended questions which focussed on their learning outcomes in the different teaching/learning modalities of the subject. Data were analysed in two phases using a modified phenomenographic analysis. In the first phase a set of categories of description were developed from the student responses to questions related to the learning modalities. In the second phase the individual responses were classified in terms of the categories. Finally, correlations between the learning modalities were identified. In this paper the approach to analysis, the process of category identification and the correlations between the learning modalities will be described and the implications for further research and teaching will be discussed.
Results: The findings indicated that there were two distinct groups of student responses. Inward focussed students who described outcomes in terms of their own learning and students whose focus was outward i.e. describing learning in terms of patient care and how learning relates to that care. Another important result shows the relationship between the learning modalities and outcomes. From the students' perspective, the most sophisticated outcomes of the lectures and laboratories were ideas and skills to be used and applied in clinical settings. Whereas, the group-based activities in which clinical problems were presented to the students in the form of Situation Improvement Packages (SIPS) focussed their attention on the clinical setting which constituted a preparation for the realities of clinical practice.
Conclusion: The findings from this study indicate that students perceive their learning in the group based teaching/learning modality (SIPS) as effective in focussing them on the reality of their role in the clinical practice environment while lectures and laboratories provided the skills and knowledge required for this setting.

The self concepts and possible selves of problem gamblers : a qualitative exploration

The study investigated the self-concepts and possible selves of pathological gamblers. Six female egm users were recruited from a Victorian problem gambling counselling service. Three participants were currently gambling and three were not gambling. They were interviewed in-depth and using thematic analysis four dominant themes were identified. (1) Self-concepts tended to be consistent across all participants, (2) having a past self as being the dominant characteristics of possible selves coincided with greater possible selves clarity, (3) non-gambler’s had more elaborate and specific plans for how to create change than did gambler’s, and (4) non-gambler’s had more plans to become possible selves which address goals of intrinsic meaning, rather then having a general goal to ‘not gamble’. The findings are discussed in terms of implications for the cognitive theory of possible selves and suggestions for further research to investigate the utility of the constructs as a basis for a treatment modality.

Readiness to change a problem behaviour : a conceptual framework

The thesis study aims to develop a model of readiness to enter treatment to change problem behaviour by addressing the limitations of previous models. The research shows that a model consisting of personal and social factors, mediated by problem recognition and desire for help accurately assesses readiness to enter treatment. The portfolio examines the broad framework of the Multifactor Offender Readiness Model (MORM) which assesses an offender's readiness to engage in treatment. Four case studies are presented.

Navigation of four-wheel-steering mobile robots using robust fault-tolerant sliding mode control

This paper addresses the leader-follower tracking problem of a four-wheel-steering robot subjected to nonlinear uncertainties. Two control laws have been developed, based on the adaptive sliding mode method and the adaptive input-output feedback linearization method. The proposed control schemes have been tested by means of simulations.

Estimating prey accessibility for waders : a problem still to be solved

Estimating the accessible prey fraction for short-billed waders, we used a new sampling device - the sediment- plane( Desholme t al. 1998) - to record prey density of the uppermost benthos communities in softbottom habitats. In contrast to "ordinary"core-samplers, the sediment plane allows a relatively quick sampling of the uppermost layers of the sediment and, thus, it should allow a more reliable estimate of the accessible benthos community especially of vertically mobile prey organisms such as polychaetes. To assess its usefulness, we compared samples collected with the sediment-plane that took only the uppermost 3cm of the sediment with samples taken with a core-sampler. These investigations showed significant differences between the two sampling methods. In comparison with the corresponding layer of the core samples, we found significantly higher numbers and a higher biomass for at least four polychaete species (e.g. Ragworm Nereis diversicolor) in the plane samples.Therefore, we recommend the use of the sediment-plane when studying the accessible fraction for foraging waders especially when studying short-billed species.

One image reduction algorithm for RGB color images

We investigate the problem of combining or aggregating several color values given in coding scheme RGB. For this reason, we study the problem of averaging values on lattices, and in particular on discrete product lattices. We study the arithemtic mean and the median on product lattices. We apply these aggregation functions in image reduction and we present a new algorithm based on the minimization of penalty functions on discrete product lattices.

Robust fault-tolerant leader-follower control of four-wheel-steering mobile robots using terminal sliding mode

This paper addresses the actuator failure compensation problem of non-linear fourwheel-steering mobile robots based on vehicle kinematics, undergoing both known and unknown failures causing degenerated steering performance or wheels stuck at some observable angles. Terminal sliding mode control technique is used to guarantee the tracking stability infinite time with the presence of actuator fault. Simulation results are given to illustrate the effectiveness of the proposed control scheme. © Institution of Engineers Australia 2012.

A proof of concept for using brief Dialectical Behavior Therapy as a treatment for problem gambling

Fourteen ‘treatment resistant’ problem gamblers received 9 weeks of Dialectical Behavior Therapy (DBT) at specialist problem gambling services delivered in Melbourne, Australia. This study is the first to investigate the effectiveness of a brief DBT treatment for problem gambling, with a focus on measuring change in the four DBT process skills (mindfulness, distress tolerance, emotion dysregulation, and negative relationships). Although there were no statistically significant improvements in measures of gambling behaviour, 83% of participants were abstinent or reduced their gambling expenditure pre- to post-treatment. Participants also reported statistically and clinically significant improvements in psychological distress,  mindfulness, and distress tolerance. Moreover, there were no increases in alcohol or substance use. These results are discussed in the context of focusing on a single DBT process skill, and the benefits of using group-based approaches.

Talking culture? Egalitarianism, color-blindness and racism in Australian elementary schools

This study examines egalitarianism as an ethnic-racial socialization message used by teachers with 8-12 year old children in four socio-demographically diverse elementary schools in Melbourne, Australia. The three main types of egalitarian messages identified are i) procedural-justice color-blindness, ii) distributive-justice color-blindness and iii) colormuteness, and each is explored in relation to how teachers talk to children about racial, ethnic and cultural diversity, and racism. We conclude that teacher confidence and capability, and to a lesser degree, school context, influenced the types of egalitarian messages used about diversity and the extent to which teachers had explicit and critical discussions about racism.

The application of an etiological model of personality disorders to problem gambling

Problem gambling is a significant mental health problem that creates a multitude of intrapersonal, interpersonal, and social difficulties. Recent empirical evidence suggests that personality disorders, and in particular borderline personality disorder (BPD), are commonly co-morbid with problem gambling. Despite this finding there has been very little research examining overlapping factors between these two disorders. The aim of this review is to summarise the literature exploring the relationship between problem gambling and personality disorders. The co-morbidity of personality disorders, particularly BPD, is reviewed and the characteristics of problem gamblers with co-morbid personality disordersare explored. An etiological model from the more advanced BPD literature—the biosocial developmental model of BPD—is used to review the similarities between problem gambling and BPD across four domains: early parent–child interactions, emotion regulation, co-morbid psychopathology and negative outcomes. It was concluded that personality disorders, in particular BPD are commonly co-morbid among problem gamblers and the presence of a personality disorder complicates the clinical picture. Furthermore BPD and problem gambling share similarities across the biosocial developmental model of BPD.Therefore clinicians working with problem gamblers should incorporate routine screening for personality disorders and pay careful attention to the therapeutic alliance, client motivations and therapeutic boundaries. Furthermore adjustments to therapy structure, goals and outcomes may be required. Directions for future research include further research into the applicability of the biosocial developmental model of BPD to problemgambling.