Functional system maps as boundary objects in complex system development

A trend towards the provision of product-service packaging and the proliferation of service businesses introduces both tangible and intangible elements into system design. In this paper, we consider the utility of hierarchical system models as a way of flexibly combining such elements by focusing on requisite functionality. Four cases illustrate how the same approach may be used to clarify the requirements of business or socio-technical systems during system development, operation or reengineering stages. It is suggested that a suitable loosely coupled model has significant utility as a 'boundary object' - a term first coined in the study of museum artefacts. Discussion of such objects requires the use of imagination, which may support innovative system design and development. It is suggested that a well-crafted model has multiple uses - as a foundation for system development, in combining traditional and agile project management strategies and in providing a framework to facilitate the capture and organisation of project knowledge.

Negotiating and creating intercultural relations: Chinese immigrant children in New Zealand early childhood education centres

A multiple-case study investigation of the experiences of eight Chinese immigrant children in New Zealand early childhood centres suggested that the immigrant children’s learning experiences in their first centre can be understood as a process of negotiating and creating intercultural relations. The children’s use of family cultural tools, such as the Chinese language, was a distinctive feature of their learning experiences, simultaneously revealing and extending their exploration of the intercultural practices and their establishment of a sense of belonging. In the presence of Chinese-speaking peers who acted as ‘bridges’ and ‘boundary objects’, the Chinese language was actively used by the immigrant children in English-speaking early childhood centres and, as a result, they created intercultural relations which: (i) bridged the two cultures; (ii) brought the cultures into convergence; (iii) enabled the children to claim group identity; and (iv) battled intercultural constraints. The absence of Chinese speakers, on the other hand, constrained possibilities for intercultural relations. The focus on intercultural relations in this study is expected to lead to educational initiatives to support the incorporation of diverse cultures in early childhood services.

Matching objects across the textured-smooth continuum

The problem of 3D object recognition is of immense practical importance, with the last decade witnessing a number of breakthroughs in the state of the art. Most of the previous work has focused on the matching of textured objects using local appearance descriptors extracted around salient image points. The recently proposed bag of boundaries method was the first to address directly the problem of matching smooth objects using boundary features. However, no previous work has attempted to achieve a holistic treatment of the problem by jointly using textural and shape features which is what we describe herein. Due to the complementarity of the two modalities, we fuse the corresponding matching scores and learn their relative weighting in a data specific manner by optimizing discriminative performance on synthetically distorted data. For the textural description of an object we adopt a representation in the form of a histogram of SIFT based visual words. Similarly the apparent shape of an object is represented by a histogram of discretized features capturing local shape. On a large public database of a diverse set of objects, the proposed method is shown to outperform significantly both purely textural and purely shape based approaches for matching across viewpoint variation.

Object matching using boundary descriptors

The problem of object recognition is of immense practical importance and potential, and the last decade has witnessed a number of breakthroughs in the state of the art. Most of the past object recognition work focuses on textured objects and local appearance descriptors extracted around salient points in an image. These methods fail in the matching of smooth, untextured objects for which salient point detection does not produce robust results. The recently proposed bag of boundaries (BoB) method is the first to directly address this problem. Since the texture of smooth objects is largely uninformative, BoB focuses on describing and matching objects based on their post-segmentation boundaries. Herein we address three major weaknesses of this work. The first of these is the uniform treatment of all boundary segments. Instead, we describe a method for detecting the locations and scales of salient boundary segments. Secondly, while the BoB method uses an image based elementary descriptor (HoGs + occupancy matrix), we propose a more compact descriptor based on the local profile of boundary normals’ directions. Lastly, we conduct a far more systematic evaluation, both of the bag of boundaries method and the method proposed here. Using a large public database, we demonstrate that our method exhibits greater robustness while at the same time achieving a major computational saving – object representation is extracted from an image in only 6% of the time needed to extract a bag of boundaries, and the storage requirement is similarly reduced to less than 8%.

Crossing the faith boundary

Improving the well-being of poor and vulnerable communities often requires external resources and interventions. Existing resource constraints, existing social and political structures, existing environmental circumstances, and existing economic realities are often insurmountable. Vulnerable and poor communities cannot challenge or overcome them on their own. External resources and interventions are often vital. They can act as shocks to existing systems that maintain vulnerability, can facilitate empowerment for those submerged in the dehumanisation of poverty, and can help local communities develop the capacity to equip themselves and assume the role of change agents for their own futures. The provision of such external resources and interventions is often facilitated through the involvement of non-government organisations (NGOs) that have developed expertise in working with and alongside local communities to identify, plan, implement and evaluate development interventions. These NGOs may be local to the communities themselves or be external and sit outside the partnered community. Often international NGOs partner with local ones in assisting local communities. However, collaboration between international and local NGOs, and between NGOs and local communities, should not be assumed to be without difficulty and challenges. Trust between partners, and between external agents of potential change and the communities that are the objects of these interventions, is a core component of successful collaborations.

Towards simulation of flapping wings using immersed boundary method

In this work the immersed boundary method is applied to simulate incompressible turbulent flows around stationary and moving objects. The goal is to demonstrate that the immersed boundary technique along with a large eddy simulation approach is capable of simulating the effect of the so-called leading edge vortex (LEV), which can be found in flapping wing aerodynamics. A Lagrangian method is used to approximatethe solutions in the freshly cleared cells that lay within solid objects at one time step and emerge into fluid domain at the next time step. Flow around a stationary cylinder at ReD D 20, 40, and 3900 (based oncylinder diameter D) is first studied to validate the immersed boundary solver based on the finite volume scheme using a staggered grid. Then, a harmonically oscillating cylinder at ReD D 10 000 is considered to test the solver after the Lagrangian method is implemented to interpolate the solution in the freshly cleared cells. Finally, this approach is used to study flows around a stationary flat-plate at several angles of attack and fast pitching flat-plate. The rapidly pitching plate creates a dynamic LEV that can be used to improve the efficiency of flapping wings of micro air vehicle and to determine the optimum flapping frequency.