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Hyo-Min Heo,Hyeong-WookJo,Kyu-Won Hwang,Jung-Hun Sun,Joon-Kwan Moon 한국농약과학회 2021 한국농약과학회 학술발표대회 논문집 Vol.2021 No.11
Simultaneous analytical method using LC/MSMS for imidazolinone herbicides from livestock (egg, milk, beef, pork and chicken) for monitoring was developed with QuEChERS preparation. Sample weighing (5g) in a 50mL conical tube, added 0.1 M potassium phosphate dibasic solution (5mL) was shaken for 10min. After 0.5mL 6 NHCl, 10mL acetonitrile were added, it was shaken for 10min. And QuEChERS extraction salt (Original method, 4g MgSO₄, 1g NaCl) were added to the sample in the 50 mL conical tube. The mixture was strongly shaken for 1 min and was centrifuged at 3,000g for 10 min. The acetonitrile layer was purification with dSPE (150mg MgSO₄, 25mg C18) and was centrifuged at 13,000g for 5min. The supernatant was filtered with a membrane filters (pore size: 0.2um) before analysis. ME (%, Matrix effect) for almost analytes range were -6.56 to 5.70%. MLOD (Method LOD) and MLOQ (Method LOQ) was calculated by S/N ratio. MLOQs were 0.01 mg/kg. The linear correlation coefficients (r2) were > 0.99 within the range of 2 ~ 100 ug/kg for all of the 3 imidazolinone herbicides. The percentages (of imidazolinone herbicides) recovers were in the range of 84.1 ~ 110.6% (0.01mg/kg level), 90.8 ~ 97.1% (0.1mg/kg level) and 94.4 ~ 102.1% (0.5mg/kg level) within the validation criteria (recover; 70-120% with RSD < 20%)
Kim, Min-Seon,Li, Dong-Hao,Shim, Won-Joon,Oh, Jae-Ryoung,Park, Jong-Man Korean Chemical Society 2007 Bulletin of the Korean Chemical Society Vol.28 No.3
Environmentally important phthalic esters have been analyzed by GC-MS in terms of individual phthalic esters or total phthalic esters directly or after derivatization. Derivatization improves the chromatographic characteristics of the highly polar phthalic esters. This study focused on the GC-MS determination of the total phthalic esters and the individual phthalic esters simultaneously. The phthalic esters were hydrolyzed to phthalate and corresponding alcohols in 1 M NaOH solution at 90 oC for 30 min followed by extraction with ethyl acetate after acidifcation. The phthalic acid and alcohols were simultaneously silyl derivatized using bis(trimethylsilyl)trifluoroacetamide (BSTFA) to their corresponding silyl ester and ethers in the mixture of 60% acetone and 40% ethyl acetate at room temperature within 30 min. Because of the high reactivity of BSTFA with the phthalic acid and alcohols effective silyl derivatization was possible simultaneously. GC-MS analysis of the silyl derivatives of phthalic acid and alcohols was performed. The total phthalic ester content was estimated from the analytical result of phthalic silyl ester, while the individual phthalic ester was quantified from the analytical results of alcoholic silyl ethers. This technique was applied to spiked tab water and real seawater samples from the Lake Shihwa in Korea. The results were checked against the results from the direct GC-MS analysis of the phthalic esters and reasonable recoveries with high sensitivity were achieved. The recoveries were higher than 75% with low relative standard deviation (below 10%).
알루미나이드 확산코팅된 스테인레스 합금의 내산화 및 내삭마 특성
황철홍,이효민,오정석,황동현,황유석,이종원,최정묵,박준식,Hwang, Cheol Hong,Lee, Hyo Min,Oh, Jeong Seok,Hwang, Dong Hyeon,Hwang, Yu Seok,Lee, Jong Won,Choi, Jeong Mook,Park, Joon Sik 한국분말재료학회 (*구 분말야금학회) 2021 한국분말재료학회지 (KPMI) Vol.28 No.5
Stainless steel, a type of steel used for high-temperature parts, may cause damage when exposed to high temperatures, requiring additional coatings. In particular, the Cr<sub>2</sub>O<sub>3</sub> product layer is unstable at 1000℃ and higher temperatures; therefore, it is necessary to improve the oxidation resistance. In this study, an aluminide (Fe<sub>2</sub>Al<sub>5</sub> and FeAl<sub>3</sub>) coating layer was formed on the surface of STS 630 specimens through Al diffusion coatings from 500℃ to 700℃ for up to 25 h. Because the coating layers of Fe<sub>2</sub>Al<sub>5</sub> and FeAl<sub>3</sub> could not withstand temperatures above 1200℃, an Al<sub>2</sub>O<sub>3</sub> coating layer is deposited on the surface through static oxidation treatment at 500℃ for 10 h. To confirm the ablation resistance of the resulting coating layer, dynamic flame exposure tests were conducted at 1350℃ for 5-15 min. Excellent oxidation resistance is observed in the coated base material beneath the aluminide layer. The conditions of the flame tests and coating are discussed in terms of microstructural variations.
( Won Bae ),( Han Kd ),( Jaeyoung Cho ),( Jinwoo Lee ),( Young Sik Park ),( Chang-hoon Lee ),( Sang-min Lee ),( Jae-joon Yim ),( Chul-gyu Yoo ),( Young Whan Kim ),( Sung Koo Han ),( Sun Mi Choi ) 대한결핵 및 호흡기학회 2018 대한결핵 및 호흡기학회 추계학술대회 초록집 Vol.126 No.-
Background: The effect of smoking on idiopathic pulmonary fibrosis (IPF) development is contradictory in previous studies. In this study, we investigated the effect of smoking on the development of IPF using large population-based data. Methods: From among the participants registered in the Health Checkup database from 2009 to 2012, we selected patients with definition of IPF using the National Health Insurance (NHI) service database of Korea from 2006 to 2015 and followed-up with them till December 2016. Results: A total of 23,242,836 participants were registered in the Health Checkup database, of whom 25,113 were considered incident IPF cases. The mean age was 64.1±11.3 years, and 17,314 (70%) participants were male. The number of current smokers, former smokers, and non-smokers was 6,842 (27.2%), 5,826 (23.2%), 12,445 (49.6%), respectively. The current and former smokers showed higher risk of IPF development, with an adjusted hazard ratio (aHR) of 1.664 (95% CI: 1.605-1.724) and 1.422 (95% CI: 1.371-1.475) respectively, compared to the non-smokers. The effect of smoking was greater in women than in men (aHR for smoking pack-years <10, 10 to <20, 20 to <30, and ≥30 were 1.459, 2.250, 2.625, and 2.279, respectively, in women, and 1.13, 1.304, 1.507, and 1.953, respectively, in men). Conclusion: In this study, 50.4% of the patients with IPF were current or former smokers. Current smokers had a higher risk of developing IPF than former smokers. There was a dose-response relationship between smoking and the development of IPF, and this effect was greater in women than in men.
Won, Eun-Ji,Lee, Yeonjung,Gang, Yehui,Kim, Min-Seob,Kim, Chang Joon,Kim, Hye-Eun,Lee, Kyun-Woo,Chung, Chang-Soo,Kim, Kyoungrean,Lee, Jae-Seong,Shin, Kyung-Hoon Elsevier 2018 Marine environmental research Vol.137 No.-
<P>Laboratory-scale sediment exposure was conducted as a preliminary study to assess the long-term effects of sediment contaminated with crude oil. For this purpose, indirect exposure using a glass filter crucible was tested and compared with direct exposure by observing several parameters (e.g., mortality, growth, reproduction, hatching, and uptake) in the benthic copepod Tigriopus japonicus. In direct exposure, short-term exposure caused significant damages to the eggs of ovigerous females, and there were difficulties in observing small oil droplets. However, indirect exposure did not induce any mortality during a 96-h exposure in adults. A 10-day exposure was also possible in an indirect exposure method and caused a decrease in reproduction and consequently a reduction in the hatching rate. In fact, the water phase collected from indirect exposure indicated significant polycyclic aromatic hydrocarbon (PAH) concentrations, although only a few components were present. The components of PAHs were similar to water-accommodated fractions (WAFs) of crude oil that are associated with the water-soluble part, but the relative portion of high-molecular-weight of PAHs was higher than WAF. In this approach, exposure tests caused reduction in the uptake rate in copepods even in the 24-h exposure. In conclusion, the biological effects of oil droplets from direct exposure were excluded by using a glass filter in indirect exposures, and several parameters could be derived in the long-term exposure. These results indicate that the indirect method could likely assess the chronic effects of oil-contaminated sediments on individual level parameters for deriving the ultimate effects on the population and community.</P>
Won, Jumin,Hong, Young Joon,Jeong, Myung Ho,Park, Hyuk Jin,Kim, Min Chul,Kim, Woo Jin,Kim, Hyun Kuk,Sim, Doo Sun,Kim, Ju Han,Ahn, Youngkeun,Cho, Jeong Gwan,Park, Jong Chun Chonnam National University Medical School 2016 CMJ Vol.52 No.2
<P>Statins and renin-angiotensin system (RAS) blockers are key drugs for treating patients with an acute myocardial infarction (AMI). This study was designed to show the association between treatment with statins or RAS blockers and clinical outcomes and the efficacy of two drug combination therapies in patients with ischemic heart failure (IHF) who underwent revascularization for an AMI. A total of 804 AMI patients with a left ventricular ejection fraction <40% who undertook percutaneous coronary interventions (PCI) were analyzed using the Korea Acute Myocardial Infarction Registry (KAMIR). They were divided into four groups according to the use of medications [Group I: combination of statin and RAS blocker (n=611), Group II: statin alone (n=112), Group III: RAS blocker alone (n=53), Group IV: neither treatment (n=28)]. The cumulative incidence of major adverse cardiac and cerebrovascular events (MACCEs) and independent predictors of MACCEs were investigated. Over a median follow-up study of nearly 1 year, MACCEs had occurred in 48 patients (7.9%) in Group I, 16 patients (14.3%) in Group II, 3 patients (5.7%) in Group III, 7 patients (21.4%) in Group IV (p=0.013). Groups using RAS blocker (Group I and III) showed better clinical outcomes compared with the other groups. By multivariate analysis, use of RAS blockers was the most powerful independent predictor of MACCEs in patients with IHF who underwent PCI (odds ratio 0.469, 95% confidence interval 0.285-0.772; p=0.003), but statin therapy was not found to be an independent predictor. The use of RAS blockers, but not statins, was associated with better clinical outcomes in patients with IHF who underwent PCI.</P>
Min, Sung Joon,Kim, Jin Woong,Kim, Joon Hyub,Choi, Joon Hyock,Park, Chan Won,Min, Nam Ki Hindawi Limited 2017 Journal of nanomaterials Vol.2017 No.-
<P>The sensing properties of mixed networks consisting of semiconducting and metallic single-walled carbon nanotubes (SWCNTs) have been found to largely vary depending on the ratio of semiconducting to metallic tubes. Solution-deposited 99% semiconductor-enriched nanotube networks exhibited a sensitivity of 1.908%/ppm, whereas the unenriched 66% and 90% enriched samples exhibited a sensitivity of 0.027%/ppm and 0.113%/ppm, respectively. These results suggest that it is extremely important to minimize the metallic pathways to achieve high sensitivity. After an oxygen plasma treatment, the unenriched 66% sample exhibited a 526% increase in sensitivity (0.142%/ppm) compared to the untreated one, whereas the 90% device demonstrated a sensitivity of 1.521%/ppm, which corresponds to an improvement in the sensitivity of 13.5 times the pristine 90% sample. In addition, the plasma-treated sensors exhibited a much faster response time than the untreated one. The significant improvement in the performance of the highly enriched network sensors was explained by the large increase in the anchoring sites for ammonia molecules on the surface of the semiconducting single-walled CNTs and the faster charge transfer from absorbed molecules.</P>
Review of Sarcoidosis in a Province of South Korea from 1996 to 2014
( Min-seok Kim ),( Cheol-kyu Park ),( Hong-joon Shin ),( Hyeong-won Seo ),( Jinsun Chang ),( Seong Ahn ),( Tae-ok Kim ),( Jung-hwan Lim ),( In-jae Oh ),( Yong-soo Kwon ),( Yu-il Kim ),( Sung-chul Lim 대한결핵 및 호흡기학회 2017 Tuberculosis and Respiratory Diseases Vol.80 No.3
Background: Since the introduction of endobronchial ultrasound (EBUS)-guided transbronchial needle aspiration (TBNA) of mediastinal lymph nodes, the incidence of histopathologically-confirmed sarcoidosis has increased. Methods: The electronic medical records of Chonnam National University (CNU) Hospital and CNU Hwasun Hospital (CNUHH) were searched for confirmed cases of sarcoidosis diagnosed between 1996 and 2014. Cases were selected using a combination of clinical, radiological, and pathological evidence. Of 115 cases with the relevant disease codes, 16 cases were excluded, as they had not been confirmed pathologically or had no definitive clinical features of sarcoidosis. Results: Among 99 cases of confirmed sarcoidosis, only nine patients were diagnosed with sarcoidosis before 2008; the rest were diagnosed from 2008 onward, after the introduction of EBUS-TBNA. EBUS-TBNA was used in 75.8% of patients, open surgical biopsy in 13.2%, and mediastinoscopic biopsy in 5.1%. At the time of diagnosis, 42.4% of sarcoidosis cases were at stage I, 55.6% at stage II, and 2% at stage III. Spontaneous remission of sarcoidosis was observed in 33.3% of cases, and stable disease in 37.4%; systemic steroid treatment was initiated in 23.2% of cases. Of the patients treated with systemic steroids, 69.6% showed improvement. The median duration of steroid treatment was 5 months. Conclusion: Following the introduction of EBUS-TBNA, the number of newly diagnosed sarcoidosis patients has increased. Clinical features of sarcoidosis were similar to those previously reported. Spontaneous remission occurred in about one-third of patients, while one-fourth of patients required systemic steroid treatment.