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RISS 인기검색어
- 검색키워드
- 저자 : 南勝祐(Seung Woo Nam) (검색결과 96 건)
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유동흐름 전류계를 이용한 정수장 고탁도 유입수 응집 제어 방법에 대한 연구
남승우,조병일,김원경,조경덕,Nam, Seung-Woo,Jo, Byung-Il,Kim, Won-Kyong,Zoh, Kyung-Duk 한국환경보건학회 2012 한국환경보건학회지 Vol.38 No.2
Objectives: This study was aimed at determining the optimum coagulation dosage in a high turbid kaolin water sample using streaming current detection (SCD) as an alternative to the jar test. Methods: SCD is able to optimize coagulant dosing by titration of negatively charged particles. Kaolin particles were used to mimic highly turbid water ranging from 50 to 600 NTU, and polyaluminum chloride (PAC, 17%) was applied as a titrant and coagulant. The coagulation consisted of rapid stirring (5 min at 140 rpm), reduced stirring (20 min at 70 rpm), and settling (60 min). To confirm the coagulation effect, a jar test was also compared with the SCD titration results. Results: SCD titration of kaolin water samples showed that the dose of PAC increased as the pH rose. However, supernatant turbidity less than 1 NTU after coagulation was not achieved for high turbid water by SCD titration. Instead, a conversion factor was used to calculate the optimum PAC dosage for high turbid water by correlating a jar test result with that from an SCD titration. Using this approach, we were able to successfully achieve less than 1 NTU in treated water. Conclusions: For high turbid water influent in a water treatment plant, particularly during summer, the application of SCD control by applying a conversion factor can be more useful than a jar test due to the rapid calculation of coagulation dosage. Also, the interpolation of converted PAC dose could successfully achieve turbidity in the treated water of less than 1 NTU. This result indicates that an SCD system can be effectively used in a water treatment plant even for high turbid water during the rainy season.
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남승우,조경덕,Nam, Seung-Woo,Zoh, Kyung-Duk 한국환경보건학회 2013 한국환경보건학회지 Vol.39 No.5
Micropollutants emerge in surface water through untreated discharge from sewage and wastewater treatment plants (STPs and WWTPs). Most micropollutants resist the conventional systems in place at water treatment plants (WTPs) and survive the production of tap water. In particular, pharmaceuticals and endocrine disruptors (ECDs) are micropollutants frequently detected in drinking water. In this review, we summarized the distribution of micropollutants at WTPs and also scrutinized the effectiveness and mechanisms for their removal at each stage of drinking water production. Micropollutants demonstrated clear concentrations in the final effluents of WTPs. Although chronic exposure to micropollutants in drinking water has unclear adverse effects on humans, peer reviews have argued that continuous accumulation in water environments and inappropriate removal at WTPs has the potential to eventually affect human health. Among the available removal mechanisms for micropollutants at WTPs, coagulation alone is unlikely to eliminate the pollutants, but ionized compounds can be adsorbed to natural particles (e.g. clay and colloidal particles) and metal salts in coagulants. Hydrophobicities of micropollutants are a critical factor in adsorption removal using activated carbon. Disinfection can reduce contaminants through oxidation by disinfectants (e.g. ozone, chlorine and ultraviolet light), but unidentified toxic byproducts may result from such treatments. Overall, the persistence of micropollutants in a treatment system is based on the physico-chemical properties of chemicals and the operating conditions of the processes involved. Therefore, monitoring of WTPs and effective elimination process studies for pharmaceuticals and ECDs are required to control micropollutant contamination of drinking water.
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남승우(Seung-Woo Nam) 한국무예학회 2007 무예연구 Vol.1 No.1
태권도는 우리나라의 전통무예傳統武藝로서 인체의 손과 발 전신의 근육과 관절을 이용하여 상대의 공격을 막거나 피하는 것을 우선으로 하며 부득이할 경우에 대비하여 막기인 방어기술과 차기, 지르기, 찌르기 등의 공격기술을 연마하며 이러한 수련과정을 통해 강인한 체력과 투철한 정신력을 기르며 아울러 용기와 자신감을 함양시키고 인간다운 길을 갈 수 있도록 지도하는 무도스포츠라 하겠다. 태권도 발전의 중추적 역할은 일선도장인 지역도장이었으며 지역 도장의 수련형태는 예나 지금이나 품새를 기본으로 수련 골격을 이루고 있다. 국기원 태권도 교본의 기술적인 측면에서 보면 품새가 곧 태권이며, 기본동작은 품새 동작의 바탕이 되는 동작이고, 겨루기는 품새의 실전 응용동작이다. 따라서 품새는 태권에 있어 수련의 중심인 동시에 태권도를 대표한다고 해도 과언은 아닐 것이다. 따라서 태권도 품새를 발전시키는 것은 곧 태권도를 발전시키는 것이며 태권도와 타 무술과의 뚜렷한 차이점을 보여 주는 것이다, 따라서 태권도 수련가치를 어느 한부분에 한정시키는 것이 아닌 경기 태권도의 양적 발전에 걸 맞는 태권도 품새 수련의 가치를 고찰함으로서 품새의 중요성 및 태권도의 균형적인 발전을 가져올 것이다. As a traditional martial art, Taekwondo uses hands, feet, muscles, and joints to disable or avoid an opponent’s attack and sometimes it uses kick, hit, or blow to attack the opponent. Through the training, people improve their physical strength and strong spirits as well as courage and confidence for their better human true life. The key contributors to Taekwondo development are local training centers where patters (pumsae) oriented training has been continued for a long time. According to the technical aspect of Kukkiwon Taekwondo manual, patterns are basically Taekwon, basic motions are the basis of patterns, and sparring is actual application motions of patterns. Therefore, we can say patterns are the key elements of Taekwondo training and it represents Taekwondo. Developing Taekwondo patterns means developing Taekwondo, and it makes a big difference between Taekwondo and other martial arts. Therefore, we will be able to recognize the importance of patterns and to develop Taekwondo in a balanced manner by considering the values of Taekwondo patterns training which is in accordance with quantitative development of Kyunggi Taekwondo, rather than limiting the values Taekwondo training to a restricted area.
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초등학교 태권도 특기적성교육의 참여 동기가 학교생활적응에 미치는 영향
남승우(Nam Seung-Woo),김태일(Kim Tae-Il),장종오(Jang Jong-Oh) 한국체육과학회 2010 한국체육과학회지 Vol.19 No.3
This study is for putting it to the test that the motive for participation in a Taekwondo specialty aptitude education could affect positively the adaptation to school life by analyzing and defining its effects. For this purpose, the participants were selected from 4th to 6th grader of 6 elementary schools located in Muju, Chunbok, and 307 questionnaires from 372 students participating Taekwondo specialty aptitude education were analyzed The analyses were carried out using SPSS/PC+(version 11.0), Windows software, and the conclusions are as follows. First, the t-test to sub-variables of adaptation to school life divided by sex shows the motive of participation is connected to the relationships with teachers or classmates. Second, the multiple regression analysis of the effect of the motive for participation on the relationship with teachers shows a significancy with a high value of R-square, 45.1%. The motive for sanctification has a huge effect on the relationship with teachers (β=.668), the motive for education and entertainment (β=.078) and health and physical strength (β=-0.137) in detail.
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미숙과 건여주(Momordica charantia L.) 추출물의 항산화 활성 및 암세포 증식 억제 효과
남승우(Seung-Woo Nam),김미라(Meera Kim) 한국식품영양과학회 2017 한국식품영양과학회지 Vol.46 No.12
본 연구에서는 국내에서 재배된 미숙과 건여주의 열수 및 에탄올 추출물을 이용하여 항산화 성분 및 항산화 활성, 암세포 증식 억제 활성을 분석하였다. 분석 결과, 열수 추출물은 8.59 mg GAE/g, 에탄올 추출물은 9.95 mg GAE/g의 총 폴리페놀을 함유하였고, 총 플라보노이드 함량은 열수추출물이 1.71 mg QE/g, 에탄올 추출물이 5.24 mg QE/g으로 나타났다. 또한, 열수 추출물은 15.77 mg/100 g, 에탄올 추출물은 85.61 mg/100 g의 총 비타민 C를 함유하고 있어, 전체적으로 볼 때 에탄올 추출물이 열수 추출물보다 총 폴리페놀 화합물, 총 플라보노이드 화합물, 비타민 C 등 기능성 유용 성분들을 더 많이 함유하고 있는 것으로 나타났다. 미숙과 건여주 추출물의 DPPH 라디칼 소거능을 측정한 결과, 두 추출물 모두 1,000 μg/assay 농도에서 50% 이상의 라디칼 소거능을 나타내었고, 에탄올 추출물이 열수 추출물보다 유의적으로 높은 라디칼 소거능을 나타내었다. ABTS 라디칼 소거능 측정에서도 두 추출물 모두 1,000 μg/assay 농도에서 70% 이상의 높은 라디칼 소거능을 보여주었으며, 에탄올 추출물이 열수 추출물보다 유의적으로 높은 소거능을 나타내었다. 인체 암세포를 이용하여 측정한 세포독성 실험에서는 MTT assay 결과, 800 ppm에서 에탄올 추출물이 실험한 모든 암세포에 대해 열수 추출물보다 높은 세포증식 억제 활성을 나타내었고, HeLa에 대해 90.52%의 매우 높은 세포증식 억제 활성을 보여주었다. SRB assay에서도 600 ppm 이상의 농도에서 에탄올 추출물이 열수 추출물보다 유의적으로 높은 세포증식 억제 활성을 나타내었으며, MTT assay와 마찬가지로 HeLa에 대해 800 ppm에서 87.22%로 가장 높은 세포증식 억제 활성을 보여주었다. 미숙과 건여주 에탄올 추출물을 처리한 HeLa cell의 형태 변화를 inverted microscope로 관찰한 결과, 세포의 결속력이 떨어지며 세포의 주위에 다량의 잔해들이 보였고 세포 수의 감소 및 세포의 응축을 관찰할 수 있었다. 따라서 본 연구를 통해 미숙과 건여주가 높은 항산화 활성과 암세포 증식 억제 활성을 가지고 있음을 확인할 수 있었으며, 향후 미숙과 건여주가 기능성 식품 소재로 이용될 수 있을 것으로 기대된다. This study investigated the antioxidant activities and cytotoxicities of hot-water extract (WEM) and ethanol extract (EEM) of dried immature bitter melon (Momordica charantia L.) cultivated in Korea. Total ascorbic acid, total polyphenol, and total flavonoid contents of the EEM were higher than those of the WEM. The radical scavenging effect of EEM was 57.09% in the 2,2-diphenyl-1-picrylhydrazyl assay and 75.76% in the 2,2’-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt assay at 1,000 μg/assay. Antioxidant activities of the WEM and EEM were concentration-dependent in both methods. Cytotoxicities of the extracts in human cancer cells (HeLa, Hep3B, and A549) and normal human cells (HeLa229) were evaluated by thiazolyl blue tetrazolium bromide (MTT) and sulforhodamine B (SRB) assays. Extracts showed strong inhibitory effects on cancer cell growth. The cytotoxicity of EEM in the tested cancer cells was higher than that of the WEM at 800 ppm. In particular, the cytotoxicities of EEM in HeLa cells at 800 ppm in the MTT and SRB assays were 90.52% and 87.22%, respectively. On the other hand, both extracts presented relatively lower cytotoxicities in normal human cells compared to human cancer cells. In addition, weakened cohesion and shrink shape of HeLa cells treated with EEM were examined under an inverted microscope. These findings suggest that EEM with excellent antioxidant activity and cytotoxicity has potential as a resource for the development of natural functional materials.
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