Search results

The purpose of this paper is to present a robotic motion compensation system, using ultrasound images, to assist orthopedic surgery. The robotic system can compensate for femur movements during bone drilling procedures. Although it may have other applications, the system was thought to be used in hip resurfacing (HR) prosthesis surgery to implant the initial guide tool. The system requires no fiducial markers implanted in the patient, by using only non-invasive ultrasound images.

The femur location in the operating room is obtained by processing ultrasound (USA) and computer tomography (CT) images, obtained, respectively, in the intra-operative and pre-operative scenarios. During surgery, the bone position and orientation is obtained by registration of USA and CT three-dimensional (3D) point clouds, using an optical measurement system and also passive markers attached to the USA probe and to the drill. The system description, image processing, calibration procedures and results with simulated and real experiments are presented and described to illustrate the system in operation.

The robotic system can compensate for femur movements, during bone drilling procedures. In most experiments, the update was always validated, with errors of 2 mm/4°.

The navigation system is based entirely on the information extracted from images obtained from CT pre-operatively and USA intra-operatively. Contrary to current surgical systems, it does not use any type of implant in the bone to track the femur movements.

The purpose of this paper is to describe a calibration method developed to improve the accuracy of a six degrees-of-freedom medical robot. The proposed calibration approach aims to enhance the robot’s accuracy in a specific target workspace. A comparison of five observability indices is also done to choose the most appropriate calibration robot configurations.

The calibration method is based on the forward kinematic approach, which uses a nonlinear optimization model. The used experimental data are 84 end-effector positions, which are measured using a laser tracker. The calibration configurations are chosen through an observability analysis, while the validation after calibration is carried out in 336 positions within the target workspace.

Simulations allowed finding the most appropriate observability index for choosing the optimal calibration configurations. They also showed the ability of our calibration model to identify most of the considered robot’s parameters, despite measurement errors. Experimental tests confirmed the simulation findings and showed that the robot’s mean position error is reduced from 3.992 mm before calibration to 0.387 mm after, and the maximum error is reduced from 5.957 to 0.851 mm.

This paper presents a calibration method which makes it possible to accurately identify the kinematic errors for a novel medical robot. In addition, this paper presents a comparison between the five observability indices proposed in the literature. The proposed method might be applied to any industrial or medical robot similar to the robot studied in this paper.

Emerging discourses focusing on the social, emotional, educational, and economic disadvantages identified for Australia’s First Peoples (when compared to their non-Indigenous counterparts) are becoming increasingly dissociated with an understanding of the interplay between historical and current trends in racism. In addition, it may be argued that the very construction of Western perspectives of Indigenous identity (as opposed to identities) may be deeply entwined within the undertones of the interplay between epistemological racism, and the emergence of new racism today.

This chapter shall review a substantial portion of Aboriginal and Torres Strait Islander educational research, with a particular emphasis on the acknowledgment of the impact of racism on the educational outcomes (and other life outcomes) of Aboriginal and Torres Strait Islander peoples with a focus on higher education.

This review has found that while there is evidence emerging toward the engagement of Aboriginal and Torres Strait Islander students in all forms of education, there is also considerable resistance to targeted efforts to reduce the inequities between Aboriginal and Torres Strait Islander students and all Australians (especially within the university sector). It is argued this resistance, both at the student and curriculum level, is clear evidence of preexisting epistemological mentalities and racism.

The implications of this review suggest that greater effort needs to be placed in recognizing unique Aboriginal and Torres Strait Islander experiences and perspectives, not only at the student level, but such perspectives need to be imbedded throughout the whole university environment.

This paper aims to explore the effectiveness of ethnically targeted ads in developing consumer–brand relationships through an application of social identification theory and elaboration likelihood model among African American consumers in the service sector.

Study 1 used a 2 (service type: hedonic vs utilitarian) × 2 (strength of ethnic identification: high vs low) between-subjects experimental design. Study 2 used the same experimental design, procedure and ads as Study 1.

Taken together, the findings from these two studies demonstrate how ethnically targeted advertising, in conjunction with service type, can influence consumer–brand relationships. The results showed that those with high strength of ethnic identification had more brand love, as well as higher intentions to spread positive word-of-mouth, purchase intention and brand loyalty for hedonic services, but that this effect was not significant for utilitarian services.

The environments in which advertisements appear (e.g. in an in-store display or a magazine advertisement) is important, and consumers’ reactions to targeted ads in various environments should be considered in future research. Future studies should also examine the role of individuals’ personality traits and level of acculturation in determining their relationships with brands.

Across two studies, the authors demonstrated that ethnic ads are more effective for African American individuals with high level of ethnic identification especially for hedonic services.

Across countless generations, Aboriginal and Torres Strait Islander people have had a vision for the health and well-being of all elements of Australia and its people. This includes directions for preventing inequity, crime, environmental degradation and illness. But the paths to take – and the knowledges that exist – have long been flooded by a negative discourse about Aboriginal and Torres Strait Islander people that blames, shames and discriminates, locating over-representation in prisons and poor health and well-being as a cultural deficit, apportioned to individuals rather than the complex systems and politics of knowledge construction that surround it. Rural criminology has an opportunity to change tracks to redress the lack of cultural competence training and cultural safety planning among its workforce – the 97 percent who have the power to create change for the small and young population of Aboriginal and Torres Strait Islander people. This chapter identifies steps in the path to change and opportunities for rural criminology including identifying shared determinants of justice and health, decolonising evidence for decision-making and improving accountability including through partnerships with Aboriginal and Torres Strait Islander community leaders. This chapter asserts a freedom and confidence that emanates from decolonising methodologies, reflexivity in research and meeting aspirations of local community Elders and leaders with Aboriginal and Torres Strait Islander cultural values and strengths. ‘Next steps’ in constructing a more culturally responsive rural criminology are presented, with a summary of roles and spheres of influence to consider.

In this chapter we focus on food sovereignty and agroecology, in the transnational peasant social movement La Via Campesina, as issues which help us analyze mechanisms of internal convergence in rural social movements. We examine such convergence through the building of collective processes, and in the construction of mobilizing frames for collective action. In particular, we analyze the encounter and diálogo de saberes (dialog among different knowledges and ways of knowing) between different rural cultures (East, West, North, and South; peasant, indigenous, and rural proletarian; etc.) that take place within it. This dialog among the “absences” left out by the dominant monoculture of ideas, has led to a process of convergence that has yielded important “emergences,” which range from mobilizing frames for collective action – like the food sovereignty concept – to social methodologies for the spread of agroecology among peasant families.

This chapter explores inclusive approaches to reading instruction for Australian Aboriginal and/or Torres Strait Islander children. Drawing from the literature on effective reading instruction, culturally appropriate instructional practices, and the authors’ research on reading interventions in remote communities in Australia we assert that to be inclusive you must provide a learning environment that supports all students to learn. Further, that the approaches used in this learning environment should be evidence-based.

Generally, theory and research investigating the effectiveness of mentoring has offered little resounding evidence to attest to mentoring programmes being a strategic initiative that make a real difference in reducing the educational inequities many minority students endure. In contrast to this existing research base, the Australian Indigenous Mentoring Experience (AIME) has often been cited as one of the most successful mentoring initiatives within Australia. It is the purpose of this chapter to examine how AIME may impact on the educational aspirations and school self-concept of Aboriginal and Torres Strait Islander students.

A series of multi-group analyses were centred around Confirmatory Factor Analysis (CFA) and structural equation modelling techniques that sought not only to explore the psychometric validity of the measures utilized within this study, but also to identify how the measures may be related after accounting for background variables (e.g. gender, parental education).

The results found that the measures utilized held strong psychometric properties allowing an increased level of confidence in the measures used and the conclusion that may be drawn from their use in analyses. Overall, the results suggested that AIME is an effective tool for increasing not only the educational aspirations of Aboriginal and Torres Strait Islander students but also their levels (and utility) of School Self-concept and School Enjoyment.

The implications suggest that not only is AIME an essential tool for closing the educational gap between Aboriginal and Torres Strait Islander and non-Aboriginal students, but also our understanding of mentoring must be extended well beyond simplistic notions of role-modelling.