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Son, Ho Yeon,Jun, Hwiseok,Kim, Kyeong Rak,Hong, Cheol Am,Nam, Yoon Sung Elsevier 2018 Journal of industrial and engineering chemistry Vol.63 No.-
<P><B>Abstract</B></P> <P>Plasmonic nanostructures have received increasing attention for photochemical applications due to high light absorptivity, tunability, sensitivity, and robustness. However, the short lifetime of hot electrons limits their efficient extraction, requiring the well-defined assembly of neighboring functional materials (e.g., electron filters and catalysts) along with the plasmonic nanostructures. Here we report the polyphenol-mediated assembly of gold nanoparticles (AuNPs) and titanium dioxide nanoparticles (TiO<SUB>2</SUB> NPs) into colloidal plasmonic heterostructures. Tannic acid (TA) is deposited on the surface of TiO<SUB>2</SUB> NPs through metal-ligand coordination, where TA serves as a reducing agent to synthesize AuNPs on the surface of TiO<SUB>2</SUB> NPs. The generation and injection of hot carriers from the plasmonic heterostructures exhibit faster electron transfer kinetics under visible light illumination as determined using ferricyanide as a redox agent. Subsequent surface coatings of TiO<SUB>2</SUB> NPs with phosphate-functionalized polyethylene glycol is shown as an effective means of selective surface passivation to suppress the charge transfer in the semiconductor/electrolyte interface. We expect that the interface control of plasmonic heterostructures for functional assembly and passivation can be utilized for their photochemical applications through integration with catalytic and sensing components.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Hong, Jung-Ki,Lee, Bo-Mi,Son, Ju Yeon,Park, Jin-Rak,Lee, Sung Hye,Kim, Kap-Soon,Yu, Soon-Ju,Noh, Hye-ran The Korean Society of Analytical Science 2019 분석과학 Vol.32 No.2
Despite the expansion of sewage treatment facilities to reduce pollutants in the tributaries of the Han River, water pollution accidents such as fish deaths continue to frequently occur. The purpose of this study was to identify the pollutant sources using water quality and stable isotope ratio (${\delta}^{15}N$, ${\delta}^{13}C$, ${\delta}^{15}N-NH_4$, ${\delta}^{15}N-NO_3$) analysis results in the three inflow tributaries (Gulpocheon (GP), Anyangcheon (AY) and Sincheon (SC)) of the Han River. Water quality was analyzed in June and October from 2013 to 2017, and the results showed that the concentrations of nutrients, such as T-N, $NO_3-N$, and T-P, were increased at GP4, AY3, SC3, and SC4, which lie downstream of sewage treatment facilities. The results of ${\delta}^{15}N$ for June 2017 indicated that the source of nitrogen was sewage or livestock excreta at GP4 and SC4, and organic fertilizers at AY3 and SC3. ${\delta}^{15}N-NO_3$ results suggested that the source of nitrogen was related to organic sewage, livestock or manure at GP4, AY3 and SC4. Therefore, GP4 and SC4 were more influenced by effluent from sewage treatment facilities than by their tributaries, AY3 and SC3 were considered to be influenced more by their tributary than effluent from sewage treatment facilities. With the results of this study, the source of contamination (sewage treatment facility effluent) of river inflow downstream of Han River could be confirmed using water quality and stable isotope ratio.
A study on the relationship between job stress and nicotine dependence in Korean workers
Seung Rak Son,Byeong Moo Choe,Seong Hwan Kim,Young Seoub Hong,Byoung Gwon Kim 대한직업환경의학회 2016 대한직업환경의학회지 Vol.28 No.-
Background: Nicotine dependence and its severity are often determined by individuals’ psychosocial factors.This study purposed to analyze how Korean workers’ job stress is related with their nicotine dependence according to demographic and occupational characteristics in order to reduce smoking related to job stress and to establish objective indicators to be used in developing adequate smoking cessation strategies. Methods: The subjects of this study were 4,639 workers who replied to the questionnaire survey. In addition, 1,948 current smokers were separated from non-smokers and ex-smokers, and the relationship between job stress and nicotine dependence was analyzed with the current smoker group. Nicotine dependence was tested using Fagerström’s Test of Nicotine Dependence, and stress was measured using a questionnaire on subjective stress felt by workers in their daily life and the short form of the Korean Occupational Stress Scale. Results: The smoking rate was 54.1 % among men and 2.5 % among women. Nicotine dependence was significantly different according to interpersonal conflict, organization system and lack of reward (p < 0.05). As multivariate logistic analysis, job control, occupational climate and total stress score were statistical significant (p < 0.05). Conclusions: Job stress was found to be related with smoking status and nicotine dependence. Based on this result, it is suggested to enhance workers’ welfare for health promotion in workplace by improving their working environment in order to reduce job stress and consequently to decrease the smoking rate.
Enflurane 또는 Propofol을 이용한 전신마취에서 지혈대에 의한 고혈압과 활력징후의 변화
양홍석,박수성,서병태,정월선,김락범 대한마취과학회 2000 Korean Journal of Anesthesiology Vol.39 No.4
Background: The tourniquet is associated with severe hemodynamic changes and toumiquet-induced hypertension (T-HTN). Propofol is pferred as an anesthetic agent for rapid induction and recovery, and less nausea and vomiting. The aim of this study was to find the difference in hemodynamic changes and the T-HTN in patients with total knee replacement arthroplasty receiving enflurane or propofol anesthesia. Methods: One hundred patients underwent total knee replacement arthroplasty were divided into four groups; enflurane-control (n = 22), enflurane-elderly (n = 28), propofol-control (n = 22), propofol-elderly (n = 28). Mean arterial blood pressure (MAP), heart rate (HR) and end-tidal CO₂ (PETCO_2) were recorded throughout the operations of each group. Statistical analysis was done using repeated measures of ANOVA, chai-square test (P $lt; 0.05). Results: MAP increased in the propofol group during the toumiquet inflation period compared to the period before toumiquet inflation. The incidence of T-HTN in the propol group (58%) was higher than that of the enflurane group (36%). HR increased in the enflurane group just after toumiquet inflation. PETCO_2 decreased during 20 60 minutes after tourniquet inflation in the propofol group (P $lt; 0.05). MAP decreased and PO increased during the 1, 5 minutes after tourniquet deflation in all groups. There were minimal HR changes after tourniquet deflation in all groups. Conclusions: T-HTN occurrence and MAP were shown to be higher in the propofol anesthesia and both enflurane and propofol can be used as an anesthetic agent for total knee replacement arthroplasty without complications.
Jung-Ki Hong,Bo-Mi Lee,Ju Yeon Son,Jin-Rak Park,Sung Hye Lee,Kap-Soon Kim,Soon-Ju Yu,Hye-ran Noh 한국분석과학회 2019 분석과학 Vol.32 No.2
Despite the expansion of sewage treatment facilities to reduce pollutants in the tributaries of the Han River, water pollution accidents such as fish deaths continue to frequently occur. The purpose of this study was to identify the pollutant sources using water quality and stable isotope ratio (δ15N, δ13C, δ15N-NH4, δ15NNO3) analysis results in the three inflow tributaries (Gulpocheon (GP), Anyangcheon (AY) and Sincheon (SC)) of the Han River. Water quality was analyzed in June and October from 2013 to 2017, and the results showed that the concentrations of nutrients, such as T-N, NO3-N, and T-P, were increased at GP4, AY3, SC3, and SC4, which lie downstream of sewage treatment facilities. The results of δ15N for June 2017 indicated that the source of nitrogen was sewage or livestock excreta at GP4 and SC4, and organic fertilizers at AY3 and SC3. δ15N-NO3 results suggested that the source of nitrogen was related to organic sewage, livestock or manure at GP4, AY3 and SC4. Therefore, GP4 and SC4 were more influenced by effluent from sewage treatment facilities than by their tributaries, AY3 and SC3 were considered to be influenced more by their tributary than effluent from sewage treatment facilities. With the results of this study, the source of contamination (sewage treatment facility effluent) of river inflow downstream of Han River could be confirmed using water quality and stable isotope ratio.