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Branched DNA-based Synthesis of Fluorescent Silver Nanocluster
박주원,송재중,박준혁,박노경,김성지 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.4
While single strand DNAs have been widely used for the scaffold of brightly fluorescent silver nanoclusters (Ag NCs), double strand DNAs have not been as successful. Herein, we report a novel synthetic approach for bright Ag NCs using branched double strand DNAs as the scaffolds for synthesis. X-shaped DNA (X-DNA) and Y-shaped DNA (Y-DNA) effectively stabilized Ag NCs, and both X-DNA and Y-DNA resulted in brightly fluorescent Ag NCs. The concentration and molar ratio of silver and DNA were found important for the fluorescence efficiency. The brightest Ag NC with the photoluminescence quantum efficiency of 19.8% was obtained for the reaction condition of 10 μM X-DNA, 70 μM silver, and the reaction time of 48 h. The fluorescence lifetime was about 2 ns for the Ag NCs and was also slightly dependent on the synthetic condition. Addition of Cu ions at the Ag NC preparations resulted in the quenching of Ag NC fluorescence, which was different to the brightening cases of single strand DNA stabilized Ag NCs.
정민섭,송재중,박상혁,문장권 국제문화기술진흥원 2022 The Journal of the Convergence on Culture Technolo Vol.8 No.2
우리 사회는 정보통신기술 발달로 온라인 가상세계와 현실 세계가 융합하여 새로운 세계가 창조되는 메타버스 로 인해 새로운 전환기에 접어들고 있다. 엔터테인먼트 분야에 치중되었던 메타버스의 영역은 친교 활동, 교육, 상거 래 등 일상의 영역으로 점차 확대되고 있으며, 전투원에게 실제 전장과 같은 가상훈련 환경을 제공하고, 사격과 기동, 통신, 방호 등 군사분야에서 활용성도 커지고 있다. 따라서 본 연구는 메타버스의 개념과 핵심유형, 발전 동향과 군사 분야에서의 활용성에 대해 논하고자 한다. Society is entering a new transition period due to the metaverse, where a new world is created by the fusion of the online virtual world and the real world with the development of information and communication technology. The realm of Metaverse, which was focused on entertainment, is gradually expanding into everyday areas such as fellowship activities, education, and commerce. Its application is also increasing in the field. Therefore, this study intends to discuss the concept, core type, development trend, and future application of the metaverse in the military field.
Synthesis of Novel Organic Dyes Containing Coumarin Moiety for Solar Cell
최현봉,백철,Hyun Jun Kim,Jeum-Jong Kim,송기형,Sang Ook Kang,고재중 대한화학회 2007 Bulletin of the Korean Chemical Society Vol.28 No.11
Novel organic dyes, JK-34, JK-35 and JK-36 containing bis-dimethylfluorenyl amino coumarin unit are designed and synthesized. Nanocrystalline TiO2 dye-sensitized solar cells were fabricated using these dyes. Under standard global AM 1.5 solar condition, the JK-34 sensitized cell gave a short circuit photocurrent density of 10.05 mA cm-2, open circuit voltage of 0.65 V, and a fill factor of 0.68, corresponding to an overall conversion efficiency h of 4.54%. We found that the power conversion efficiency was shown to be quite sensitive to the structural modifications of bridging thiophene moiety.
위궤양 환자에서 Helicobacter pylori 와 NSAID 의 역할에 관한 연구
김나영(Na Young Kim),박용주(Yong Ju Park),안경주(Kyung Ju Ahn),이규현(Gyu Hyun Lee),임병철(Byung Chul Lim),고영희(Young Hee Koh),고재중(Jae Jung Ko),임선희(Seon Hee Lim),이계희(Kye Heui Lee),정현채(Hyun Chae Jung),송인성(In Sung Song 대한내과학회 1998 대한내과학회지 Vol.54 No.4
N/A Objectives: H pylori infection and NSAID are very important risk factors for peptic ulcer. This study was conducted to investigate the H. pylori positivity rate and the rate of NSAID ingestion in the patients with benign gastric ulcer(BGl.J), to investigate which test and which site are the most adequate to reduce the false positivity rate of H. pylori, and finally to investigate the role of H. pylori and NSAID in BGU bleeding. Methods: This study was conducted for the 180 patients with HGU, and H pylori was diagnosed by any of CLO test, Gram stain of touch print and H&E stain in the antrum and body. In addition, age, sex, ingestion history of NSAID within 4 weeks before gastroscopy, past BGU history, smoking, alcohol and BGU bleeding were investigated. Results : 1) The H, pylori infection rate of patients with BGU in Korea was 82.8%, and the rata of NSAID history was 26.1%. The patients with HGU who have only NSAID history were 8.3%, and the 91.1% of the patients had either H. pylori infection or NSAID history. 2) The most sensitive test for H. pylori infection among CLO test, Gram stain of touch print and H&E stain in the antrum or body was CLO test in the body. 3) Depending on H, pylori positivity, the rate of NSAID history in the H pylori negative group was 48.4%, which was higher than that of H. pylori positive, 21,5%(p=0.002). In addition, the rate of past BGU history in the H pylori positive group was 47.0%, which was higher than that of H. pylori negative, 12.9%(p<0.001). 4) Depending on thc history of NSAID, the H. pylori positivity rate in NSAID positive group was 68.1%, which was lower than that of NSAlD negative, 88.0%(p=0.002). The female percentage of NSAID positive was 40.4Yo, which was higher than that of NSAID negative, 16.5% (p<0.001). The rate of BGU bleeding in the NSAID positive was 27.7%, which was higher than that of NSAID negative, 14.3%(p=0.039). 5) The rate of NSAID history of bleeding group was 40.6%, which was higher than that of non-bleeding group, 23.0%(p=0.039). However, there was no significance in the correlation of H. pylori positivity rate to the bleeding. 6) The H. pylori positivity and NSAlD history showed no correlation with bleeding in the group below age sixty. While in the age over or equal to sixty the H. pylori positivity had no correlation with bleeding, but the rate of NSAID history was 72.7% for the patients with bleeding, which is in contrast with the 25.5% for the patients without bleeding(p=0.003). Conclusion : From these results, the H. pylori infection rate of the patients with BGU in Korea was 82.8%, and the best method for H. pylori detection was CLO test in the body. H. pylori infection had no correlation with the bleeding, but NSAID ingestion increased bleeding tendency, particularly in the group of the age over or equal to sixty.