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Yangwon Chae,Kwangsik Jang,Yesol Jo,Shamshik Shin,Sohi Kang,SeEun Kim,Kyung Mi Shim,Seong Soo Kang 한국실험동물학회 2021 한국실험동물학회 학술발표대회 논문집 Vol.2021 No.7
Introduction Radio frequency technology has been developed as a noninvasive method to reduce subcutaneous fat. This study aimed to measure the safety and effectiveness of the radiofrequency fat reduction system (RF system). We evaluated the efficiency of heat transfer to the subcutaneous layer by using ex vivo model. And then, we tried to verify the safety of the RF system by measuring skin surface temperature changes and the effectiveness by evaluating histological changes in subcutaneous lipocytes in pigs. Materials & Methods The RF system was developed and manufactured by PolyBioTech co., Ltd., Gwangju, Republic of Korea. In ex vivo model, fresh pork containing skin, subcutaneous, and muscle layer was treated with the RF system at 43℃ or 40℃ for 15 minutes. The temperature changes in the cut section of the pork were measured during treatment. In in vivo model, a dorsal skin of pig was also treated with the RF system at 45℃ for 30 minutes. The skin surface temperature of the pig was measured before and after treatment. Moreover, the treated sites were biopsied and evaluated histologically immediately, 1 day, and 7 days after treatment. Results In ex vivo model, the skin surface temperature of the pork did not exceed the set temperature value for most of the treatment time. And as the treatment time progressed, the heat gradually transferred to the deep layer. In in vivo model, the skin surface temperature of the pig remained below the set for the entire treatment time. In histological evaluation, no skin damage was observed and the sizes of subcutaneous lipocytes in pigs had shrunken by 27.87% immediately after, 30.83% 1 day after, and 34.81% 7 days after treatment. Conclusion The RF system used in this study effectively reduced subcutaneous fat without side effects such as skin damage. Based on this, it is expected that safe and effective use of this system will be possible for non-invasive fat reduction.
Yangwon Kang,Juha Park,Kanwoo Youn 대한직업환경의학회 2019 대한직업환경의학회지 Vol.31 No.-
Background: Phthalate is a chemical that is commonly used as a plasticizer in processing plastic products and as a solvent in personal care products. Although previous experimental studies have reported that phthalate metabolites are associated with obesity, epidemiological study results have been inconsistent and insufficient. The objective of the present study was to investigate the association between urinary phthalate metabolites and obesity in adult Korean population. Methods: The present study selected 4,752 Korean adults aged 19 years or older from the 2012–2014 Korean National Environmental Health Survey data. The concentrations of urinary di-(2-ethyl-5-carboxypentyl) phthalate (DEHP) metabolites—i.e., mono-(2-ethyl-5-hydroxyhexyl) phthalate (MEHHP), mono-(2-ethyl-5-oxohexyl) phthalate (MEOHP) and mono-(2-ethyl-5-carboxypentyl) phthalate—mono-benzyl phthalate (MBzP) and mono-n-butyl phthalate (MnBP) were adjusted using the urinary creatinine. We used logistic regression analysis to investigate the association between urinary phthalate metabolite concentration and body mass index (BMI) with respect to sex and age. Results: Among women, urinary MEHHP and DEHP concentrations were found to have statistically significantly positive associations with obesity (Q4 versus Q1; odds ratio (OR): 1.72, 95% confidence interval (CI): 1.19–2.49 for MEHHP and OR: 1.52, 95% CI: 1.04–2.21 for DEHP). Among men, urinary MnBP concentration was found to have statistically significantly negative association with obesity (Q4 versus Q1; OR: 0.71, 95% CI: 0.50–0.99). In the analysis stratified by sex and age, women aged ≥ 50 years showed statistically significantly positive associations between the concentrations of urinary DEHP metabolites, DEHP, MBzP, and obesity (Q4 versus Q1; OR: 1.94, 95% CI: 1.28–2.94 for MEHHP, OR: 1.88, 95% CI: 1.21–2.94 for MEOHP, OR: 2.04, 95% CI: 1.31–3.18 for DEHP, and Q3 versus Q1; OR: 1.45, 95% CI: 1.02–2.05 for MBzP). Meanwhile, men aged ≥ 50 years showed no significant associations between urinary phthalate concentrations and obesity. Conclusions: In the present study, we found differences in the associations between urinary phthalate metabolites and BMI according to sex and age. However, because the present study was cross-sectional in nature, additional support through prospective studies is needed to estimate the causal associations.
PlanetScope 영상을 이용한 해양 유출유의 색상 특성 분석
강종구 ( Jonggu Kang ),윤유정 ( Youjeong Youn ),김서연 ( Seoyeon Kim ),정예민 ( Yemin Jeong ),최소연 ( Soyeon Choi ),임윤교 ( Yungyo Im ),서영민 ( Youngmin Seo ),이양원 ( Yangwon Lee ) 대한원격탐사학회 2023 大韓遠隔探査學會誌 Vol.39 No.5
이 단보에서는 PlanetScope 영상을 사용하여 Red-Green-Blue (RGB) 히스토그램 (histogram) 분석을 통해 해양 유출유의 색상 특성과 유종 구분에 대한 실험을 수행하였다. 해양 유출유의 히스토그램은 각 밴드 화소값 분포에 따라 세 가지 카테고리(어두운 검은색 톤, 밝은 은색 톤, 밝은 무지개색 톤)로 나눌 수 있으며, 어두운 검은색 톤의 두꺼운 기름층은 중유(heavy oil)로 구분할 수 있고, 밝은 은색 및 무지개색 톤의 얇은 기름층은 경유(light oil)로 구분할 수 있다. 향후 보다 많은 영상에 대한 분석이 이루어진다면, 이러한 유출유 탐지와 유종 구분이 보다 더 일반화되고 신뢰도를 높일 수 있을 것으로 사료된다. In this letter, we used PlanetScope imagery to conduct experiments on the color characteristics for oil type classification of marine oil spills through Red-Green-Blue (RGB) histogram analysis. The histograms of marine oil spills can be divided into three categories (dark black tones, light silver tones, and light rainbow tones) according to the distribution of pixel values in each band. Thick oil layers with dark black tones can be classified as heavy oil, while thin oil layers with light silver and rainbow tones can be classified as light oil. As more images are analyzed in the future, these oil spill detection and classification methods will become more generalized and reliable.