PURPOSE To develop a criterion for determining the topographic progression of keratoconus and to analyze the prognostic factors of progression. METHODS Medical records of 211 eyes of 128 patients who had been followed up for more than 2 years on three or more occasions were retrospectively reviewed. Topographic parameters, including simulated K, corneal astigmatism, irregular astigmatism at 3...

This is the User s Guide to the GTM Toolbox a set of Matlab functions and scripts that implements and demonstrates the generative topographic mapping a method for density modelling dimensionality reduction and data visualisation This document gives a brief description of the GTM the content of the toolbox and what is required to use it It describes how to use the toolbox and provides a section ...

Unanticipated and unknown changes in an aircraft’s aerodynamic stability derivatives may cause undesirable effects that render pre-designed control laws unsuitable for maintaining stability. Gradual changes in the stability derivatives may be due to icing on lifting surfaces, whereas structural damage may cause a sudden change. For this study, we use the nonlinear NASA Generic Transport Model (...

In remote sensed data, topographic corrections are very important to overcome the topographic effects such as shadow effects. These topographic effects occurs especially in case of rugged terrain because sun facing slope represents maximum reflectance values and opposite side slope represents minimum reflectance values. These topographic effects leads to an inaccurate classification into differ...

We analysed the flora of 46 forest inventory plots (25 m x 100 m) in old growth forests from the Amazonian region to identify the role of environmental (topographic) and spatial variables (obtained using PCNM, Principal Coordinates of Neighbourhood Matrix analysis) for common and rare species. For the analyses, we used multiple partial regression to partition the specific effects of the topogra...

PURPOSE To determine the optic nerve head topographic parameters with the least variability in repeat measurements. METHODS We randomly selected and evaluated 1 eye each of 20 healthy subjects, a total of 20 eyes. We used the confocal scanning laser ophthalmoscope (CSLO) for optic nerve head analysis. The disc area and a total of 13 parameters were determined by Top SS. Each subject was exami...

Precise factors controlling the coevolution of deformation and topography in tectonically active landscapes remain poorly understood due to complex feedbacks between numerous possible variables. Here we examine the links between fault kinematics, emergent topography, and environmental factors on a global data set of active fault-driven mountain ranges (n = 41). Using simple regressions between ...

ÐWe present a general framework for data analysis and visualization by means of topographic organization and clustering. Imposing distributional assumptions on the assumed underlying latent factors makes the proposed model suitable for both visualization and clustering. The system noise will be modeled in parametric form, as a member of the exponential family of distributions and this allows us...

Grounded theory method (GTM) is increasingly used in HCI and CSCW research (Fig. 1 ). GTM offers a rigorous way to explore a domain, with an emphasis on discovering new insights, testing those insights, and building partial understandings into a broader theory of the domain. The strength of the method—as a full method— is the ability to make sense of diverse phenomena, to construct an account o...