This paper presents a procedure for automated extraction of ridge shadows in noisy gray images. This procedure mainly consists of 1) a deformable model which is designed basing upon the knowledge about the shape of shadows and is expected to be useful in extracting ridge shadows especially located in low signal to noise ratio background, and 2) the scale space scheme which is also useful even if there is less information about the size and the positions of ridge shadows in advance. This procedure is applied to artificial images and its performance is evaluated experimentally.

본 연구에서는 실험개수로에 온수방류용 방류규가 있는 방파제의 모형을 설피하여 바닥\ulcorner의 유속분포를 측정하였다. 또한 3차원의 모형인 Fluent 모형을 이용하여 방파제의 방류구로부터 배출된 바닥젵의 유속구조를 수치모의하여 실험결과와 비교.검증하였으며 흐름특성을 규명하였다. 바닥젵은 자유젵에 비하여 흐름의 확립구간이 짧았으며, 종방향거리에 대한 젵 중앙유속의 감쇠율이 자유젵보다 크게 나타나고 있음이 밝혀졌다. 단순젵과 부력젵의 젵 중앙선에서의

In this paper we examine the mass transport within the boundary layer near the sea bottom. The fluid domain is seperated into inner and outer region of boundary layers. In outer region, the wave field is assumed to be inviscid and irrotational. When the incident waves enter the arrays of circular cylinders, the scattering of water waves by an array of N bottom mounted vertical circular cylinders is solved using the method proposed by Linton & Evans under the potential theory. In inner region, the Navier-Stokes equation must be satisfied with boundary conditions at the boundary later and bottom is to be represented by the sum of the Eulerian mean drift and the Stokes' drift.