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Growing Complexity (growing + complexity)

Distribution by Scientific Domains

Business, Economics, Finance and Accounting	40%

Selected Abstracts

Interpreting three-dimensional structures from two-dimensional images: a web-based interactive 3D teaching model of surgical liver anatomy

HPB, Issue 6 2009
Jodi L. Crossingham
Abstract Background:, Given the increasing number of indications for liver surgery and the growing complexity of operations, many trainees in surgical, imaging and related subspecialties require a good working knowledge of the complex intrahepatic anatomy. Computed tomography (CT), the most commonly used liver imaging modality, enhances our understanding of liver anatomy, but comprises a two-dimensional (2D) representation of a complex 3D organ. It is challenging for trainees to acquire the necessary skills for converting these 2D images into 3D mental reconstructions because learning opportunities are limited and internal hepatic anatomy is complicated, asymmetrical and variable. We have created a website that uses interactive 3D models of the liver to assist trainees in understanding the complex spatial anatomy of the liver and to help them create a 3D mental interpretation of this anatomy when viewing CT scans. Methods:, Computed tomography scans were imported into DICOM imaging software (OsiriXÔ) to obtain 3D surface renderings of the liver and its internal structures. Using these 3D renderings as a reference, 3D models of the liver surface and the intrahepatic structures, portal veins, hepatic veins, hepatic arteries and the biliary system were created using 3D modelling software (Cinema 4DÔ). Results:, Using current best practices for creating multimedia tools, a unique, freely available, online learning resource has been developed, entitled Visual Interactive Resource for Teaching, Understanding And Learning Liver Anatomy (VIRTUAL Liver) (http://pie.med.utoronto.ca/VLiver). This website uses interactive 3D models to provide trainees with a constructive resource for learning common liver anatomy and liver segmentation, and facilitates the development of the skills required to mentally reconstruct a 3D version of this anatomy from 2D CT scans. Discussion:, Although the intended audience for VIRTUAL Liver consists of residents in various medical and surgical specialties, the website will also be useful for other health care professionals (i.e. radiologists, nurses, hepatologists, radiation oncologists, family doctors) and educators because it provides a comprehensive resource for teaching liver anatomy. [source]

Distance-two interpolation for parallel algebraic multigrid

NUMERICAL LINEAR ALGEBRA WITH APPLICATIONS, Issue 2-3 2008
Hans De Sterck
Abstract Algebraic multigrid (AMG) is one of the most efficient and scalable parallel algorithms for solving sparse linear systems on unstructured grids. However, for large 3D problems, the coarse grids that are normally used in AMG often lead to growing complexity in terms of memory use and execution time per AMG V-cycle. Sparser coarse grids, such as those obtained by the parallel modified independent set (PMIS) coarsening algorithm, remedy this complexity growth but lead to nonscalable AMG convergence factors when traditional distance-one interpolation methods are used. In this paper, we study the scalability of AMG methods that combine PMIS coarse grids with long-distance interpolation methods. AMG performance and scalability are compared for previously introduced interpolation methods as well as new variants of them for a variety of relevant test problems on parallel computers. It is shown that the increased interpolation accuracy largely restores the scalability of AMG convergence factors for PMIS-coarsened grids, and in combination with complexity reducing methods, such as interpolation truncation, one obtains a class of parallel AMG methods that enjoy excellent scalability properties on large parallel computers. Copyright © 2007 John Wiley & Sons, Ltd. [source]

Teamwork for innovation , the ,troika' of promotors

R & D MANAGEMENT, Issue 1 2001
Jürgen Hauschildt
The management of innovation requires ,champions' or ,promotors' who commit with enthusiasm to the new product or the new process idea. More complex innovations will require more than one promotor. Division of labour becomes an essential success factor. According to the promotor model, at least a dyad of a ,power promotor' and a ,technology promotor' is necessary to overcome the barriers of unwillingness and of ignorance. With growing complexity, additional problems of communication and process management will occur. This will demand a third team member, the ,process promotor', who is needed to overcome the barriers of non-responsibility and non-communication between the organisational units involved and to act as navigator of the process. In this article, we present an empirical investigation of 133 innovations in the German plant construction and engineering industry. The results strengthen the hypothesis that the level of success of an innovation depends on the existence of a ,troika' of promotors. [source]

Graduate density, gender, and employment

THE BRITISH JOURNAL OF SOCIOLOGY, Issue 3 2002
Malcolm Brynin
ABSTRACT The expansion of higher education is often viewed as reflecting increased demand for skills, whether related to technological change or the growing complexity of the economy. It is also linked to widening pay differentials between the poorly and highly educated. There are reasons, however, to question these associations. Even if demand for graduates is growing the supply of graduates might as a result of the status derived from having a degree still exceed this. The demand for graduates itself need not be wholly tied in with upgrading of the labour force. Graduates could be part of a more flexible workforce who increasingly undertake non-graduate work, thus downgrading their labour-market position. LFS (Labour Force Survey) and BHPS (British Household Panel Study) data are used to show that there has been no major shift in the distribution of graduates in the British labour market, that career starts are increasingly at a lower status point, and that there is a negative effect of graduate density on wages. There are also redistributional effects. There has been a large increase in the social demand for higher education by women, and they have gained from this expansion while men have lost out. In addition, graduate density is positive for non-graduates, who gain from the reduced rewards accruing to graduates. The results call into question the simple idea of a trend towards a demand for increasing levels of skills and qualifications. More attention should be paid to the distribution of skills and to complex interactions within this. [source]

Commercial Innovations from Consulting Engineering Firms: An Empirical Exploration of a Novel Source of New Product Ideas

THE JOURNAL OF PRODUCT INNOVATION MANAGEMENT, Issue 4 2003
Ian Alam
Industrial firms interact with many outside organizations such as the customers, suppliers, competitors, and universities to obtain input for their new product development (NPD) programs. The importance of interfirm interactions is reflected in a large number of interdisciplinary studies reported in a wide variety of literature bases. As a result, several sources of new product ideas have been investigated in the extant literature. Yet given the growing complexity and risks in new product development, there seems to be a need for managers to obtain input from new and unutilized sources. Apparently, one source that industry has not tapped adequately for its NPD efforts is the consulting engineering firms (CEFs). To fill the aforementioned gap in the literature, this article explores the roles and suitability of CEFs in new product development by conducting a rigorous in-depth case research of new product idea generation in a large Australian firm manufacturing a variety of industrial products. To generate ideas for the sponsoring firm, longitudinal field interviews with 64 managers and engineers from 32 large CEFs were conducted over a one-and-one-half year period. The findings of the field interviews were combined with the documentary evidences and the archival data. This longitudinal data collection enabled the author to generate new product ideas over real time and to gain access to the information that otherwise might have been difficult to obtain. The results suggest that CEFs are a rich source of new product ideas of potential commercial value. However, industry is making little use of CEFs, which underscores the need for industrial firms to collaborate and to establish an effective idea transfer relationship with them. Moreover, the services of CEFs are not restricted to idea generation but can stretch across the entire NPD process. These findings of the study encourage product managers to conceptualize NPD as a highly synergistic mutually interdependent process between CEFs and industrial firms rather than simply an arm's-length consulting transactions. Given the dearth of research on idea generation with CEFs, this study highlights the findings that are novel and that go beyond the techniques of new product idea generation established in the extant literature. [source]