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이용봉(Y. B. Lee),윤병로(B. R Yoon),권휴상(H. S. Kwon),박경암(K. A. Park),유선학(S. H. Yoo) 한국유체기계학회 2001 유체기계 연구개발 발표회 논문집 Vol.- No.-
Noise is one of the major environmental problems in human life. To reduce the noise emitted from the control valve it is necessary to develop the measurement method, measurement system, analysis method applicable to the field. In this study IEC and ISO standards were investigated and measurement method for the valve noise was proposed. Noise from the valve was measured in the reverberation room and sound power level was calculated. The sound power level increased as the flow rate and pressure difference increased. The noise characteristics are useful to predict valve noise for given conditions, to compare the performance of different valves and to develope low-noise valves.
영역 정보를 이용한 비디오 데이터의 카메라 모션 검출 및 대표 프레임 선택 방법
이용현(Yong-Hyun Lee),강행봉(Hang-Bong Kang),박용진(Yong-Jin Park) 한국정보과학회 1998 한국정보과학회 학술발표논문집 Vol.25 No.2Ⅱ
많은 양의 비디오 테이터가 디지털화 되면서 사용자가 쉽게 자신이 원하는 비디오 데이터를 검색할 수 있는 내용 기반 검색이 필요하게 되었다. 내용 기반 검색을 위해서는 비디오 데이터를 연속된 카메라 모션의 구성된 셧으로 나누고, 셧의 내용을 대표 할 수 있는 대표 프레임을 찾아야 한다. 대표 프레임은 비디오 데이터의 요약과 색인의 중요한 수단이다. 본 논문에서는 셧의 내용 기반으로 대표 프레임을 찾기 위해서 프레임에 존재하는 영역 정보를 바탕으로 셧의 내용을 알 수 있는 핵심 정보인 카메라 모션을 검출 하고, 이를 기반으로 대표 프레임을 선택하는 방법을 제안한다.
대비감도함수를 이용한 자동차용 헤드램프 노면 균일도 평가 연구
이용철(Yongcheol Lee),이수봉(Soobong Lee) 한국자동차공학회 2022 한국자동차공학회 학술대회 및 전시회 Vol.2022 No.11
Drivers can feel tired and be obstructed to look forward because of uneven road light. We needed SW to predict and prevent these uneven lights at the design stage, and to test uniformity in the product. In this paper, a contrast sensitivity function was used to develop uniformity test SW of road light of the headlamp. In order to a person to identify an object, there must be a difference in brightness. The contrast threshold to which bright and dark can be identified varies with the spatial frequency. It is called a contrast sensitivity function (CSF) that formula of the relationship between contrast and spatial frequency for human eyes. If there is a difference in brightness with respect to the drivers viewing angle that is less than the contrast threshold, we may feel that the road light is uniform because we cannot distinguish the brightness difference. if the difference in brightness is larger than the contrast threshold, the area of road light would be felt unevenly. The viewing angle can be calculated from the distance information. Contrast can be calculated from illuminance distribution of the road light. The contrast threshold of road light felt unevenly was obtained through experiments. The test subjects checked the position felt unevenly at the real road with HAL and LED headlamp at night. The same lamps were compared through simulation of the spatial frequency and contrast of the position felt unevenly after the photometric scan at testing room. Through this, it was defined that the CSF for road light uniformity test. We developed a program that extracts the illuminance distribution along the horizontal and vertical 0.25° step line from the drivers view and calculates the contrast and spatial frequency. The program marks uneven areas in the road light pattern. As a result, a uniformity visualization program similar to the road uniformity seen in the driver’s view. Through a uniformity visualization program. It is possible to predict and prevent uneven light at the design stage. When a problem occurs in the product, we can easily determine the area that needs to improve.