Depth estimation of metallic objects using multiwavelets scale-space representation

The problem of dimensional defects in aluminum die-castings is widespread throughout the foundry industry and their detection is of paramount importance in maintaining product quality. Due to the unpredictable factory environment and metallic with highly reflective nature, it is extremely hard to estimate true dimensionality of these metallic parts, autonomously. Some existing vision systems are capable of estimating depth to high accuracy, however are very much hardware dependent, involving the use of light and laser pattern projectors, integrated into vision systems or laser scanners. However, due to the reflective nature of these metallic parts and variable factory environments, the aforementioned vision systems tend to exhibit unpromising performance. Moreover, hardware dependency makes these systems cumbersome and costly. In this work, we propose a novel robust 3D reconstruction algorithm capable of reconstructing dimensionally accurate 3D depth models of the aluminum die-castings. The developed system is very simple and cost effective as it consists of only a pair of stereo cameras and a defused fluorescent light. The proposed vision system is capable of estimating surface depths within the accuracy of 0.5mm. In addition, the system is invariant to illuminative variations as well as orientation and location of the objects on the input image space, making the developed system highly robust. Due to its hardware simplicity and robustness, it can be implemented in different factory environments without a significant change in the setup. The proposed system is a major part of quality inspection system for the automotive manufacturing industry.

Scandal, censorship and representation in the online world : an ethical conundrum

This research begins by examining the foundation issues of content censorship from a literary perspective and then proceeds in comparison to discuss the issues of online content appropriateness and whether the same censorship principles of literature are transitional to the online world. Currently, uncertainty exists in how to tackle this issue as there appears to be a lack of formal rules or suggested guidelines applied to the content appropriateness, management and availability of online material. Therefore, where does the onus of online content censorship exist in this medium? Or is it left to the ethical and moral standards of the material source/creator, online access provider or the cultural ethics of the wider community to adjudicate?

The hidden martingale restriction in Gram-Charlier option prices

A hidden martingale restriction is developed for option pricing models based on Gram-Charlier expansions of the normal density function. The restriction is hidden behind a reduction in parameter space for the Gram-Charlier expansion coefficients. The resulting restriction is invisible in the option price.

What is a presentational media regime? The contemporary breakdown in systems of representation

Foundational to both the operation and legitimation of our traditional media is the idea of representation: in some sense the images of television, the sounds of radio, the narratives of film, and the various public personalities stand in or in place of ourselves. Likewise our contemporary political system function as an elaborate representational system, where regions, "seats", electorates, the nation, and the nationstate are represented by individuals, parties and symbols. Although, there are differences between and among modern nation-states as clearly different political and cultural agendas are at play, the interplay of contemporary media, culture and politics has produced what can be called a 'representational regime' that more or less operates globally, albeit fragmented into national and regional groupings.

This paper explores the initial stages in the breakdown of this system of representation that has allowed a certain organization of culture and politics to expand and develop over the last two centuries. It acknowledges that central to this regime is something Nick Couldry has identified as "the myth of the mediated centre" (Couldry, 2003). What the paper argues, and therefore differs from Couldry's conclusion, is that there are cracks in the glue that holds the system together and they are emerging in the uses of new media. Through an exploration of presentational media - that is, media that is more involved with the presentation of the self for public/private and networked consumption than traditional media's effort to embody their audience in its narratives - the paper reaches for conclusions that identify a more elaborate legitimation crisis looming in our political and cultural worlds.

Multiple representation in learning about evaporation

There has been extensive research on children's understanding of evaporation, but representational issues entailed in this understanding have not been investigated in depth. This study explored three students' engagement with science concepts relating to evaporation through various representational modes, such as diagrams, verbal accounts, gestures, and captioned drawings. This engagement entailed students (a) clarifying their thinking through exploring representational resources; (b) developing understanding of what these representations signify; and (c) learning how to construct representational aspects of scientific explanation. The study involved a sequence of classroom lessons on evaporation and structured interviews with nine children, and found that a focus on representational challenges provided fresh insights into the conceptual task involved in learning science. The findings suggest that teacher-mediated negotiation of representational issues as students construct different modal accounts can support enriched learning by enabling both (a) richer conceptual understanding by students; and (b) enhanced teacher insights into students' thinking.

The sword and the pen in the pre-modern Arabic heritage : a literacy representation of an important historical relationship

The so-called "literary debate" in Greek, Latin and many Near Eastern
languages is a well-developed genre. In his 1987 article, Geert Jan van Gelder surveyed its background more than adequately, 1 and very few details of that paper need to be repeated here. He assessed thoroughly the historical contribution of numerous poets to the relationship between "the sword and the pen," and also analyzed various aspects of this relationship in a few prose texts.

The social role of design representation

Design representation is a crucial part of all design activity. Representations provide a vehicle through which design ideas and decisions are explored, communicated and recorded. Since representation is so fundamental to design, it follows that a deep understanding of the nature and use of representation has the potential to improve current design practice. While there is recognition in the IS literature of the importance of representation, previous IS research has focused almost entirely on the functional aspects of representation, in particular modelling to support various methodologies or particular aspects of design such as database, object-oriented or process modelling. Since the development of an information system is a socio-technical process, this paper argues that we need to understand how representations can facilitate both the specification of the artefact, and the social aspects of design. This paper explores the use of design representation by real-world practitioners. It identifies two hitherto neglected social purposes of representation employed by designers when interacting with clients or users: selective focus, and promotion. The paper concludes by noting that as IS faces increasingly complex design challenges it is timely to examine our understanding of all aspects of design representation including its role in facilitating the social aspects of design.

Migrant youth, cultural identity and media representation

The current social climate of heightened intercultural tensions in culturally pluralist societies such as Australia highlights the need to develop a more nuanced understanding of the complex cultural adjustment processes  encountered by migrant youth in developing and articulating a sense of  national belonging, To this end, this chapter examines migrant settlement experiences as a 'process by which individuals and groups ... maintain their cultural identity while actively participating in the larger societal framework' (Karac 2001). Research into these critical aspects of integration and  acculturation examines identity formation as a cultural process of  renegotiating individual and group identity, and focuses on concepts of belonging, recognition and self-respect (Berry '997). While cultural factors are considered critical indicators of successful integration into the host community, insufficient research has been conducted into the particular processes of group and individual identity formation that take place amongst migrant youth. In the case of Australia, this process has been made  particularly difficult for some cultural groups due to the contemporary resurgence of populist and exclusionary discourses of national identity. In such a context, the construction of identity amongst migrant youth is all the more challenging, especially when this process exhibits notions of dual attachment, hybridity and difference. For migrant youth, the engagement with different social institutions such as family, school and wider societal networks often affects the processes of identity 'formation that are inherently  dynamic and 'necessarily multiple and fluid' (Noble & Tabar 2002, pp.I28). Negotiating life in-between cultures, youths from migrant backgrounds experience identity construction as a highly contested territory.

Cultural identity is a central issue for immigrants, regardless of how much time has elapsed since leaving their country of origin. This issue is particularly salient for first- and second-generation1 migrant youth, who negotiate identity space comfortably alongside, in opposition to, or more commonly, somewhere in between, their immigrant parents' conceptions of culture and the receiving culture in which they live. Unlike their native peers,  the children of immigrants arc exposed to intra-ethnic and inter- ethnic   dynamics and experiences in their journey towards cultural identity formation. These experiences are complex and diverse, and are navigated within multi- layered ethnic, racial, familial, gendered, socioeconomic and educational  contexts.

The chapter begins by providing theoretical frameworks for conceptualising  cultural diversity and cultural identity. It then examines how migrant youth  negotiate cultural identity in the public realms of family networks and school  environments and how these translate into key educational and behavioural  outcomes. It will draw on some qualitative snapshots as a way of illustrating  shifting migrant youth attitudes towards society, school and culture.

Art embodied and disembodied : expression, representation, and reflection

In this chapter a group of writers from very diverse academic backgrounds deal with the embodied and disembodied arts - from an exploration of dance with preschool children to the use of the webblog for eleven and twelve year olds to reflect on the creation of a group performance about how to change the world. The Deans & Young case study takes the reader into the world of the preschooler and the delicate craft of the dance and drama teachers who guide their small dancers through myriad choreographic and conceptual tasks in their pursuit of kinaesthetic learning. Jo Raphael allow the young bloggers to speak from themselves in her case study. How to Change the World. Through the voices of the Year 6 students, Jo raises the critical question of how to build meaningful reflection into the arts-making process, and suggests that for the current generation of 'cyber-natives', the digital world offers many great possibilities. Theory concerning forms of expression and representation in the embodies and digital world is also discussed.

Parrot interpreter : representation, extinction and the electronic information environment

Carter discusses insights and ideas on and about parrots, based on his book of the same name. Parrot understanding is an understanding of the critical role noise plays in binding man together, and in relating to the external world whose resistance to translation is not a source of anxiety but a phenomenon respectfully to embrace. Moreover, the most remarkable thing about parrot is not perhaps that it speaks but that it listens.

Young children’s use of a delayed video representation to solve a retrieval problem pertaining to self

The experiments reported here were concerned with the development of delayed self-recognition. Children were videotaped playing a game and were marked covertly with a sticker on their forehead while doing so. The findings, of both a cross-sectional sample and a prospective longitudinal one, revealed that 3- but not 2.5-year-old children reached to remove this sticker reliably during video playback only after they had been trained to use the video to guide their search for an object that was not directly visible to the unaided eye. It appears that by 3 years of age children understand that their briefly delayed self video-representation is related to their present self. In contrast, while 2.5-year-olds can use delayed vid of information to locate objects in space that cannot be seen by the unaided eye, they cannot use this type of information to locate an object that pertains to a part of self that is not directly visible, such as a sticker on one’s hair. The findings are discussed in terms of the emergence of an extended
sense of self.