A geometric model for segmentation of images with missing boundaries is presented. Some classical problems of boundary completion in cognitive images, like the pop up of subjective contours in the famous triangle of Kanizsa, are faced from a surface evolution point of view. The method is based on the mean curvature evolution of a graph with respect to the Riemannian metric induced by the image....

Transverse Modal Vibrations of Vertical Tensioned Risers. A simplified Analytical Approach — The paper examines the physics of riser transverse modal vibrations of the type induced by VIV (Vortex Induced Vibrations). It presents a simplified analytical solution for such vibrations of vertical tensioned risers with uniform linear characteristics. The solution leads to simple expressions for the ...

In this paper the interaction of free–stream acoustic waves with the leading edge of an aerodynamic body is investigated and we compare two different methods for analysing this interaction. Results are compared for a method which incorporates Orr–Sommerfeld calculations using the parabolized stability equation (PSE) to those of direct numerical simulations (DNS). By comparing the streamwise amp...

Changes in the measured structural responses, such as deflections and modal properties, induced by damage could be significantly smaller than those by environmental effects such as temperature and temperature gradients. To make the structural health monitoring more reliable and applicable to real structures, it is highly desirable to develop a methodology to distinguish the changes due to the s...

In this paper, A flexibility-based method for damage identification of cantilever-type structures is proposed. Using the linear relation between flexibility matrix element and structure parameter, the damage equation involving modal parameter and damage coefficient of each structure element is established firstly. Then, using the free vibration response signal of structure and the time-frequenc...

A total of 60 subjects, 20 in each experimental condition, gave 'same-different' judgments to pairs of stimuli differing in radius of curvature. Stimuli were presented intramodally to vision, intramodally to haptic touch, and cross-modally to vision and haptic touch. Results showed that performance, quantified by the measure d', differed among the three modality conditions, being best in vision...