On computable approximations of Landau's constant

We present an algorithm which computes the Landau constant up to any given precision

A Local to Global Principle for the Complexity of Riemann Mappings (Extended Abstract)

We show that the computational complexity of Riemann mappings can be bounded by the complexity needed to compute conformal mappings locally at boundary points. As a consequence we get first formally proven upper bounds for Schwarz-Christoffel mappings and, more generally, Riemann mappings of domains with piecewise analytic boundaries

Products of effective topological spaces and a uniformly computable Tychonoff Theorem

This article is a fundamental study in computable analysis. In the framework of Type-2 effectivity, TTE, we investigate computability aspects on finite and infinite products of effective topological spaces. For obtaining uniform results we introduce natural multi-representations of the class of all effective topological spaces, of their points, of their subsets and of their compact subsets. We show that the binary, finite and countable product operations on effective topological spaces are computable. For spaces with non-empty base sets the factors can be retrieved from the products. We study computability of the product operations on points, on arbitrary subsets and on compact subsets. For the case of compact sets the results are uniformly computable versions of Tychonoff's Theorem (stating that every Cartesian product of compact spaces is compact) for both, the cover multi-representation and the "minimal cover" multi-representation

Risks and complications in rhinoplasty

Rhinoplasty is regarded to be associated with many risks as the expectations of patient and physician are not always corresponding. Besides of postoperative deformities many other risks and complications have to be considered

What Leaders Learn As They Lead Successful Change Efforts

As the complexity of change efforts increases in healthcare organizations, the demands on leadership increase, as well. This study examines the experience of the leaders who implemented the Emergency Department Patient Navigation (EDPN) program at Presbyterian Healthcare Services (PHS). Utilizing a case study methodology to interview 12 participants, open-ended questions captured in-depth descriptions of what participants learned as they led a successful change effort. Findings emerged in three categories: Personal Shift to Agreement, Success Factors, and Leadership Characteristics. Personal Shift to Agreement was used to describe the difference between the prior state and the end state. Terms used to describe what caused the shift include trust, leadership, communication and a focus on the patient. What emerged as significant factors supporting the success of the program are the use of an enterprise approach, leader modeling, the importance of making difficult decisions, the navigator role, and physician involvement. Key Leadership Characteristics identified by participants as important to have demonstrated personally were adaptability, innovation, and collaboration. Analysis demonstrates that the program was led utilizing effective change methodology, thus creating transformational changes in patient care, and in transformation in the personal leadership of several participants (Kotter 1996). The role of the physicians in development of the program demonstrated effective use of the social networks, specifically as Opinion Leaders (Rogers, 2002). Effective use of Distributed Cognition (Hutchins, 1995) to develop the solutions allowed the team to create an environment that brought the strength of the enterprise to bear on the national problem of wait times in an Emergency Department (ED)