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정성운(Sung-Woon Jung),권혁주(Hyuk-Ju Kwon),김영춘(Young-Choon Kim),안상호(Sang-Ho Ahn),이성학(Sung-Hak Lee) 한국정보기술학회 2020 한국정보기술학회논문지 Vol.18 No.8
The GAN(generative adversarial network) learning-based image transformation can be used for conversion from day images to night images. However, in the case of converting from night images to day images, because the lost information in the night image is predicted and recreated, it exposes more problems than when converting day images into night images. In this paper, we proposed a method of converting day images into night images based on pix2pix. The proposed method reduces the number of hidden units in the pix2pix to solve the problem of gradient vanishing and adjusted the exposure value of the captured day image to create training data for the virtual night image. The experimental results show that the proposed method is superior to pix2pix and Cycle GAN in MOS(mean opinion score) and PSNR(Peak Signal-to-Noise Ratio).
국부적 gamma-shift 영상 증식을 이용한 GAN기반 LDR 영상 변환 학습
정성운(Sung-Woon Jung),권혁주(Hyuk-Ju Kwon),김영춘(Young-Choon Kim),안상호(Sang-Ho Ahn),이성학(Sung-Hak Lee) 대한전자공학회 2020 대한전자공학회 학술대회 Vol.2020 No.8
The unpaired image-to-image translation showed potential of GAN(Generative Adversarial Network) in an image creation field. However when converting HDR(high dynamic range) tone mapping images, the directional results of converting domain images into HDR tone mapping images are distorted or slightly brighter. Therefore, we present method of LDR(low dynamic range) image transformation with Generative Adversarial Network based on the RW GAN. The proposed method is to extend the data tone level by gamma-shift. so, this paper modifies the weight loss function and RFT(regional fusion training) methods of the RW GAN. The local contrast of results is enhanced and the color preservation performance is better than conventional methods.
정수슬러지를 재활용한 인공경량골재의 제조 및 비점오염원 여재의 적용
정성운 ( Sung-un Jung ),이승호 ( Seoung-ho Lee ),남궁현민 ( Hyun-min Namgung ) 산업진흥원 2021 산업진흥연구 Vol.6 No.4
본 연구는 정수슬러지의 활용을 위하여 경량골재를 제조하고, 그 물성을 확인하기 위하여 경량골재의 특성과 그 활용가능성을 확인하는 것이다. 경량골재 원료로써 특성을 알아보기 위하여 화학조성 및 열적 특성에 대하여 검토하였다. 급속소성법을 이용하여 골재를 소성하고 물성을 측정하였다. 정수슬러지는 높은 강열감량을 가지고 있었으며, 높은 내화도를 가지고 있었다. 정수슬러지를 30wt% 첨가하였을 때 1,150~1,200℃의 온도에서 경량화되는 것을 확인할 수 있었고, 1200℃이상의 온도에서 밀도 0.8이하의 초경량골재도 제조할 수 있었다. 일반골재를 대체하여 콘크리트에 적용 시 28일 강도가 200~600㎏f/㎠를 갖는 공시체를 얻을 수 있었으며, 여과재 시험 시 일반모래와 동등 이상의 성능을 나타냈다. The purpose of this study is to manufacture lightweight aggregates for recycling water treatment sludge, to identify the physical properties of the aggregates, and present a method of utilizing the manufactured lightweight aggregates. The chemical composition and thermal properties were examined via a raw materials analysis. The aggregate examined here was fired by the rapid sintering method and the single-particle density and water absorption rate were measured. Water treatment sludge has high ignition loss and high fire resistance. When 30wt% of purified sludge was added, the single-particle density of the aggregates was in the range of 0.8~1.2g/㎤ at a t emperature of 1,150 ~1,20 0℃. At temperatures of 1200℃ or higher, ultra-light aggregates having a single-particle density of 0.8 or less could be produced. When applied to concrete by replacing the general aggregate in the concrete, a specimen having strength values of 200 to 450 kgf/㎠ on 28 days was obtained, and when applied as a filter material, the performance was equal to or higher than that of ordinary sand.
포스터 전시회 : 연료첨가제 주입 전,후 승용차의 규제물질 배출현황
정성운 ( Sungwoon Jung ),손지환 ( Jihwan Son ),홍희경 ( Heekyoung Hong ),성기재 ( Kijae Sung ),김정수 ( Jeongsoo Kim ),김정화 ( Jounghwa Kim ) 한국액체미립화학회 2015 한국액체미립화학회 학술강연회 논문집 Vol.2015 No.-
This study was designed to investigate characterization of regulated pollutants (CO, HC, NOx and PM) emitted from 134 diesel and gasoline passenger cars based on emission standards according to fuel additives. The experiments using chassis dynamometer were conducted under NEDC and CVS-75 modes. Comparison for fuel additive management and test between Korea, USA, EU and Japan, Korea was more strict than others. For with/without fuel additives according to diesel emission standards, NOx of EURO 4 and EURO 5 showed a relatively similar tendency. In the case of PM reduction rate, EURO 5 was over 20% decreased than EURO 4. In the case of standard deviation/average ratio for gasoline vehicles, variation interval was big for LEV 23.3 ~ 58% and ULEV 31.6 ~ 56.4%. Following the imposition of stricter regulations (EURO 5 and ULEV), difference rate for standard deviation was big. Especially, in the case of diesel vehicles, difference rate for NOx 68% and PM 48% was the biggest. The results of present study will contribute to set up emission standards for Korean fuel additives.
연료첨가제 주입에 따른 승용차의 규제물질 배출특성 분석
정성운 ( Sung Woon Jung ),손지환 ( Ji Hwan Son ),홍희경 ( Hee Kyoung Hong ),성기재 ( Ki Jae Sung ),김정수 ( Jeong Soo Kim ),김정화 ( Joung Hwa Kim ) 한국분무공학회 2015 한국액체미립화학회지 Vol.20 No.4
This paper was designed to investigate emission characteristics of regulated pollutants (CO, HC, NOx and PM) from 134 diesel and gasoline passenger cars based on emission standards according to fuel additives. The experiments using chassis dynamometer were conducted under NEDC and CVS-75 modes. Comparison for fuel additive management and test between Korea, USA, EU and Japan, Korea was more strict than others. The fuel additives of this study was satisfied within fuel manufacturing standards. For with/without fuel additives according to diesel emission standards, NOx of EURO 4 and EURO 5 showed a relatively similar tendency. In the case of PM reduction rate, EURO 5 was over 20% increased than EURO 4.In the case of standard deviation/average ratio for gasoline vehicles, variation interval was big for LEV 23.3~58% and ULEV 31.6~56.4%. Following the imposition of stricter regulations (EURO 5 and ULEV), difference rate for standard deviation was big. Especially, in the case of diesel vehicles, difference rate for NOx 68% and PM 48% was most big. The results of present study will be of assistance in completing the legislative process and will provide basic data to set up emission standards for fuel additives in Korea.
정성운(Seung-Woon Jeung),임청환(Cheong-Hwan Lim),한범희(Beom-Hee Han),정홍량(Hong-Ryang Jung),주영철(Yeong-Cheol Joo),박미자(Mi-Ja Park) 대한방사선과학회(구 대한방사선기술학회) 2012 방사선기술과학 Vol.35 No.2
경추 정면 방사선검사 시 하악골, 후두골의 겹침 방지, 경추 추체의 배열 및 관절의 형태 등을 관찰하기 위하여 X선 입사각을 머리 방향으로 15~20°를 주고 있는 것이 보편적이다. 하지만 한국인의 체형에 맞는 입사각에 대한 연구는 거의 이루어지지 않고 있다. 이에 본 연구에서는 한국인에 적합한 입사각을 찾고, 방법을 제시하는데 목적이 있다. 입사각을 측정하기 위하여 서산에 위치한 S병원을 내원한 환자 1,044명을 대상으로 하였으며, 제 2번 ~ 제 5번 경추의 길이, 피사체-영상판 거리(OID), 제2번 경추(axis)의 경사도, 초점 - 영상판 간거리(FID)를 측정하였으며, 연령대 성별에 대한 평균값을 측정하여 적용공식에 의하여 입사각을 산출하였다. 경추 제 2번~제 5번의 평균길이는 6 ㎝ 이였으며, 10대부터 20대 까지는 경추의 길이가 커지고 30대 이후로는 경추의 길이가 작아졌으며, 남성과 여성의 차이는 약 1 ㎝ 차이가 나타났다(p<.001). OFD는 연령대, 성별과 상관없이 거의 같은 값이 측정이 되었다. 제2번 경추(axis)의 경사도는 10대와 20대는 경사도가 증가하였지만, 30대 이후로는 작게 나타났다. 또한 남성과 여성은 약 2°차이가 났다. (p<.001). FID의 측정 결과, 연령대, 성별과 상관없이 거의 같은 값이 측정되었으며, 이 값 으로 입사각을 측정한 결과, 10대는 15.9°, 20대 16.9°, 30대 16.6°, 40대 16.2°, 50대 15.9°, 60대 14.5°로 측정 되었다. 10대와 20대까지 입사각이 증가하였지만, 30대 부터는 입사각이 작게 나타났다. 또한 10대는 남 성과 여성이 같은 값으로 측정이 되었고, 20대 부터는 남성과 여성이 2°차이가 나타났다. 입사각과 제 2번~ 제 5번 경추의 길이측정, OID, 제2번 경추의 경사도, FID 와의 상관관계를 실시하였고, 입사각과 모두 유의한 상관관계가 나타났다(p<.001). 본 연구에서 경추의 평균 길이, OID, FID, 제2번 경추 (axis)의 경사도에 따라서 입사각이 다르게 나타났고, 성별과 연령에 따라 입사각이 다른 것을 알 수 있었다. 그러므로 경추 정면검사 시 연령, 성별을 고려하여 입사각을 설정하면서 검사를 시행하여야 함이 사료되며, 향후 경추검사의 입사각을 설정할 때 참고 자료로 이용될 것으로 기대된다. In anteroposterior projection for cervical vertebra, it is general that the incidence angle of X-ray is 15° to 20° degrees to head in order to prevent overlap of mandible and occipital bone and to observe array of cervical interbody and shapes of joints. However, the angle is appropriate for foreigners that was determined by foreign literature review long ago, and there have been few researches of incidence angle for Koreans’ body type. The purpose of in this study are to identify the incidence angle appropriate for Koreans and to present methodology. In order to measure the incidence angle, 1,044 patients who visited S Hospital located in Seosan were selected and measured of average length of cervical vertebra, OID, axis angle, and FID. The incidence angle was calculated from the applied formula by measuring average values per age groups and sex (see Formula 1 and 2). The average length of cervical vertebra was 6cm: the length was increased from teenagers to twenties but was decreased since thirties. The difference between males and females was around 1cm (p<.01). The OID was almost the same regardless of age groups and sex. As for axis angle, the slope was increased in teenagers and twenties, but was decreased since thirties. The difference between males and females was around 2 degrees (p<.01). The FID measurements were almost the same regardless of age groups and sex, and when the incidence angle was measured from these values, the teenagers were 15.9°, the twenties were 16.9°, the thirties were 16.6°, the forties were 16.2°, the fifties were 15.9°, and the sixties were 14.5°, indicating that the angle was increased from teenagers to the twenties but decreased since the thirties. While the angles of males and females were measured to be the same in the teenagers, the angle was different between males and females by 2°. When the incidence angle statistically analyzed with measurement of average length of cervical vertebra, OID, axis angle, and FID, all of them were shown to have correlations with the incidence angle (p<.01). Conclusively, it was shown that the incidence angle was measured differently from average length of cervical vertebra, OID, FID, and axis slope, as well as from age and sex. Therefore, it can be suggested that the anteroposterior radiation test for cervical vertebra should be conducted by different incidence angles based on age and sex. The data of this study may be used as reference in determining the incidence angle of cervical vertebra tests for the future.