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초내열 합금 Alloy718의 저주기 피로시험에서 반복연화 및 R=X (X=0,-1)효과
최병학,신수근,신정근,김선화,윤기봉,염종택,박노광 국립7개대학공동논문집간행위원회 2005 공업기술연구 Vol.5 No.-
The LCF properties for R=0 as tension-tension and R=-1 as tension-compression were examined in DA alloy718. While the hysteresis loops composed of ?ε_(t), ?ε_(p) and ?σ were figured with similaity in both of R=0 and R=-1, the loops of R=0 were continuely going down along the stress axis during cyclic fatigue progressing. It was caused by Bauschinger effect, which includes a tendancy for stress recovering as an amount of compression stress. The phenomena of cyclic softening in both of R=0 and R=1 seem to be caused by planar slip of dislocations, which was accompanied by shearing the γ'/γ" precipitates during the cyclic fatigue test.
최신형 스마트폰 디스플레이 색재현 성능향상에 관한 비교연구AMOLED 및 TFT-LCD를 중심으로
김현서 ( Hyun Suh Kim ),신수근 ( Soo Keun Shin ),이용환 ( Yong Hwan Lee ) 한국사진학회 2014 AURA Vol.0 No.32
This paper carries out an evaluation of the quality of preferred colors in digital photography reproduced on the display of smart phones. In order to inquire into the display that has established itself as a major media of the reproduction of digital photographs, this study compares the color reproduction ability of two smart phones equipped with the latest display technologies such as AM-OLED and TFT-LCD and evaluates their colors and image quality. The methods of research include: 1) an analysis of the results of preceding research through the process of an objective evaluation of colors; and 2) addition of details of an analysis of the enhanced display of the newest smart phones and suggestion of a few supplement points. It is safe to say that the scale of delivery of various visual arts through smart phones has recently exceeded that through the analogue methods. According to this flow, an objective evaluation of digital colors and a study on standards have become necessary subjects of research, regarding the way in which a picture taken is digitally reproduced on a display. This paper recorded a comparative analysis of the trend of colors reproduced through smart phones in the processes of producing and generating digital images. The displays are calculated from the range of the performance included within display gamut volume from six categories of database that are luminance, white balance, gray scale linearity, RGB channel, color reproduction and contrast.
방송장비 시험을 위한 4K UHD 그래픽 동영상 패턴발생장비 개발
곽경철(Kyungchul Kwak),양진영(Jinyoung Yang),신수근(Soogeun Shin),권동현(Donghyun Kwon) 한국방송·미디어공학회 2016 한국방송공학회 학술발표대회 논문집 Vol.2016 No.6
본 논문에서는 4K UHD 방송장비 중 디스플레이기기와 인코더의 성능 시험을 위해 개발된 패턴 발생장비를 소개하고 있다. 패턴의 제작 및 재생 방법에 따라 표출되는 패턴의 종류를 그래픽/실사, 정지/동영상으로 구분할 수 있는데 본 논문에서는 모션블러, 모션져더, AV lip sync, 텍스트 주변 인코딩 화질 열화 확인, 화이트 노이즈, 프레임 누락, HDR 확인, 지연시간 측정, 계단현상 확인, 이미지 스티킹 등 그래픽 동영상 패턴에 대해 각각의 제작 의도를 설명하고 이를 통해 디스플레이기기와 인코더의 성능을 평가하는 방법에 대한 간략한 소개와 개발된 패턴발생장비의 입출력 사양을 제시하고 있다.