Ergonomics of the Operative Field in Paediatric Minimal Access Surgery

Imperial Users onl

E-word of mouth: building sustainable and trustworthy relationships with customers in a highly regulated on-line environment

With the increasing popularity of social media, consumers now turn to different online discussion forums, consumer review sites, weblogs, social network sites and so on to seek product information and share their own experiences (Cheung and Thadani, 2010; Davies, 2008). Consequently, companies today face an increasingly difficult challenge: how to communicate with consumers online in a way that encourages trust and engagement? What may make things even more complicated is that many companies are now operating in a highly regulated environment, with the healthcare industry a typical example of this (Choi and Lee, 2007; Huh and Langteau, 2007; Nielson, 2008; von Knoop et al., 2003). Thus, pharmaceutical marketers and brand managers must understand how to communicate effectively in a highly regulated online environment. This short report aims to help such companies to build a sustainable and trustworthy relationship with their customers online. To do so, the report considers the subject from the perspective of a pharmaceutical company. It will first discuss the current regulations around the healthcare industry, highlighting the constraints pharmaceutical marketers need to face. Then, it will review current literature discussing healthcare consumers’ online behaviour. In particular, it will focus on consumers’ negative comments and their possible impact on the business. Finally, the report concludes with some suggestions about how to cope with negative comments online and build a reliable relationship with customers

L2L^2-index formula for proper cocompact group actions

We study the index of the $G$-invariant elliptic pseudo-differential operator acting on a complete Riemannian manifold, where a unimodular, locally compact group $G$ acts properly and cocompactly. An $L^2$-index formula was obtained using the heat kernel method.Comment: This is the final version (34 pages

On Monotone Sequences of Directed Flips, Triangulations of Polyhedra, and Structural Properties of a Directed Flip Graph

This paper studied the geometric and combinatorial aspects of the classical Lawson's flip algorithm in 1972. Let A be a finite set of points in R2, omega be a height function which lifts the vertices of A into R3. Every flip in triangulations of A can be associated with a direction. We first established a relatively obvious relation between monotone sequences of directed flips between triangulations of A and triangulations of the lifted point set of A in R3. We then studied the structural properties of a directed flip graph (a poset) on the set of all triangulations of A. We proved several general properties of this poset which clearly explain when Lawson's algorithm works and why it may fail in general. We further characterised the triangulations which cause failure of Lawson's algorithm, and showed that they must contain redundant interior vertices which are not removable by directed flips. A special case if this result in 3d has been shown by B.Joe in 1989. As an application, we described a simple algorithm to triangulate a special class of 3d non-convex polyhedra. We proved sufficient conditions for the termination of this algorithm and show that it runs in O(n3) time.Comment: 40 pages, 35 figure