• 대한수학회논문집
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• 제31권3호
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• pp.451-460
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• 2016

The notion of a rough fuzzy filter in a BE-algebra is introduced and some properties of such a filter are investigated. The relations between the upper (lower) rough filters and the upper (lower) approximations of their homomorphism images are discussed.

• Journal of applied mathematics & informatics
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• 제30권5_6호
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• pp.1023-1030
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• 2012

Rough sets and rough filter in BE-algebras are established an some related their properties are discussed.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 1999년도 Proceedings of International Symposium on Remote Sensing
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• pp.411-420
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• 1999

In geology, lineament features have been used to identify geological events, and many of scientists have been developed the algorithm that can be applied with the computer to recognize the lineaments. We choose several edge detection filter, line detection filters and Hough transform to detect an edge, line, and to vectorize the extracted lineament features, respectively. firstly the edge detection filter using a first-order derivative is applied to the original image In this step, rough lineament image is created Secondly, line detection filter is used to refine the previous image for further processing, where the wrong detected lines are, to some extents, excluded by using the variance of the pixel values that is composed of each line Thirdly, the thinning process is carried out to control the thickness of the line. At last, we use the Hough transform to convert the raster image to the vector one. A Landsat image is selected to extract lineament features. The result shows the lineament well regardless of directions. However, the degree of extraction of linear feature depends on the values of parameters and patterns of filters, therefore the development of new filter and the reduction of the number of parameter are required for the further study.

• Journal of Chest Surgery
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• 제15권2호
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• pp.259-265
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• 1982

We have designed a new type of bubble oxygenator (KOREA-KIM VENOTHERM OXYGENATOR) made of PVC sheet and deforming mesh incorporated in the heat exchanger, and evaluated in experimental animal for the analysis of it`s efficiency. The Oxygenator has low priming volume with high flow rate up to 6 L/rain, and efficiency of heat exchanger was excellent as 1-$1.5^{\circ}C.$ using total cardiopulmonary bypass method under moderate to deep hypothermia. Average priming volume of 1317 ml with 30% hemodilution method was perfused with an average of 1.1-3.0 L/min.$M^2$of arterial blood and pure oxygen at a rate of 2-3.4 L/min for 49.6 minutes continuously in average. During total cardiopulmonary bypass, average $PaO_2$ was $159.8{\pm}60$mmHg, $PaCO_2$ $41.0{\pm}3$mmHg respectively under $SaO_2$ over 96% with systolic arterial pressure of 70 mmHg and CVP of 5-10 cm$H_2O$. Plasma free Hemoglobin was $7.0{\pm}4$ mg/dl with 25% drop of hemoglobin and hematocrit at the end of cardiopulmonary bypass. This KKV Oxygenator was observed to have excellent capabillty of oxygen and carbon dioxide gas transfer with small amount of blood trauma, and the efficiency of heat exchanger was satisfactory during cooling and rewarming of the bubbled blood. Disadvantages have included the somewhat poor deforming effect due to loose PVC fiber mesh, the extracompact character of Teflon filters, and the rough inner surface of the heat exchanger copper pipes.

• 한국항해항만학회지
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• 제26권1호
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• pp.28-34
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• 2002

해면에 난반사되어 돌아오는 신호는 잡음이 되는데, 이를 클러터(Clutter)라 한다. 클러터는 레이더 화면에 백색 가우시안 잡음과 같은 형태로 나타나게 되며, 이들은 선박용 레이더의 탐지 효율을 저하 시킨다 따라서 클러터 제거를 위한 연후는 안테나의 개선 또는 여러 종류의 필터 등을 통해 환발하게 진행되고 있다. 본논문에서는 선박 레이더와 탐지 효율을 향상을 위하여, 웨이브렛(Wavelet)과 수리형태학(Morphology)의 $3{\times}3$SQ(Square) 형태소를 적용한 메디언 필터를 사용하여 조난 또는 구조 선박의 수색을 용이하게 할수 있는 알고리듬을 제안한다.

• 전자공학회논문지CI
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• 제38권1호
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• pp.19-25
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• 2001

공간 필터링 신경회로망을 이용한 필기체 문자 인식의 특징 추출 방법을 제안한다. 필기체 문자의 특징 추출을 위한 신경망은 먼저, 불규칙한 화소를 제거하는 전처리를 수행한다. 그 후, 윤곽선 검출 및 제거를 통해 외곽선 정보들을 소거한다. 그리고 문자의 특징에 해당하는 정보를 추출한 후 잡음을 제거한다. 제안된 시스템은 시각영역에서 나타나는 여러 가지 세포들의 수용 영역에 대응하는 공간 필터를 활용한 것이다. 제안된 시스템의 타당성을 확인하기 위한 실험은 PE2 데이터를 사용하였다. 실험을 통해 공간필터링 신경회로망을 이용한 필기체 문자의 특징 추출 시스템은 곡선이나 원, 사각형이 포함된 형태의 필기 문자에서도 특징 추출이 용이하다는 것을 확인할 수 있다.