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Lee, Sang A,Oh, Seokjae,Hwang, Jae-Yeol,Choi, Minseok,Youn, Chulmin,Kim, Ji Woong,Chang, Seo Hyoung,Woo, Sungmin,Bae, Jong-Seong,Park, Sungkyun,Kim, Young-Min,Lee, Suyoun,Choi, Taekjib,Kim, Sung Wng,C The Royal Society of Chemistry 2017 ENERGY AND ENVIRONMENTAL SCIENCE Vol.10 No.4
<P>Transition metal oxides have been extensively studied and utilized as efficient catalysts. However, the strongly correlated behavior which often results in intriguing emergent phenomena in these materials has been mostly overlooked in understanding the electrochemical activities. Here, we demonstrate a close correlation between the phase transitions and oxygen evolution reaction (OER) in strongly correlated SrRuO3. By systematically introducing Ru-O vacancies into the single-crystalline SrRuO3epitaxial thin films, we induced a phase transition in crystalline symmetry which resulted in the corresponding modification of the electronic structure. The modified electronic structure significantly affects the electrochemical activities, so a 30% decrease in the overpotential for the OER activity was achieved. Our study suggests that a substantial enhancement in the OER activity can be realized even within single material systems, by rational design and engineering of their crystal and electronic structures.</P>
Current multicenter clinical trials in Korea - Introduction to KGOG
( Chulmin Lee ) 대한산부인과학회 2019 대한산부인과학회 학술대회 Vol.105 No.-
Clinical trials are booming in Asian countries through recent years. The trials registered on clinicaltrials.gov shows that Asian countries comprise 15% of all trials since 2000 which ranks Asia on third position after North America and Europe and is still counting. This may be safely interpreted as Asian popularity is becoming more important in medical investigations and in global effort of fight against specific disease such as cancer. And research competence is getting stronger in Asia as well. The Korean Gynecologic Oncology Group (KGOG) was established in 2003 and has expanded its research capabilities blazingly fast. KGOG is actively engaged in number of trials with NRG oncology, keeps partnership with GCIG and more. One of the big collaboration with GOG was GOG 213 trial which was published in 2018. It was about whether to use bevacizumab after secondary cytoreduction in platinum- sensitive recurrent ovarian cancer and the participants from South Korea reached 43.7% out of 485 total enrollment. KGOG is currently involved in number of legacy GOG studies such as GOG 237, 278, 263, 265, RTOG 0724 and GCIG trials such as TACO, SHAPE. KGOG is recently continuing its collaboration with North Americans with NRG-005 and NRG-018 while actively proposing new concepts. KGOG also has active domestic protocols about early cervical cancer detection, novel approach to cervical cancer such as metformin, fertility-sparing in early endometrial cancer, and evaluation of HIPEC. Target therapies and immunologic drugs are also actively investigated by home-grown protocols. The bird's eye view of individual representative trials will be presented. KGOG is forging important trials within Asia as well. Durvalumab in recurrent ovarian clear cell cancer (MOCCA trial), upfront surgery versus neoadjuvant chemotherapy in advanced ovarian cancer (SUNNY trial), opting out adjuvant chemotherapy in early ovarian cancer (JGOG 3020) are a few examples of collaboration currently on-going among Asian countries. Asia is unique in ethnicity and different in constitution from other regions hence results from previous trials performed mostly in western countries should be carefully vetted and interpreted as such. And it is yet another reason clinical trials in Asia are poised to increase. As Asia is contributing in every aspect globally, now is the time that Asians should come together in fight against gynecologic cancer.
Lee Hyeyoung,Ryu Ji Hyeong,Yun Sojeong,Jang Joo Hee,Choi Ae-Ran,Cho Sung-Yeon,Park Chulmin,Lee Dong Gun,Oh Eun-Jee 대한감염학회 2020 Infection and Chemotherapy Vol.52 No.4
The ichroma Chikungunya virus (CHIKV) IgG/IgM (Boditech Med Inc., Chuncheon, Korea) is a newly developed rapid lateral flow immunoassay for detection of anti- CHIKV-IgG/IgM. This study conducted with thirty-six anti-CHIKV IgG positive sera, 57 anti-CHIKV IgM positive sera and 163 anti-CHIKV IgG/IgM negative sera which were confirmed by commercial enzyme-linked immunosorbent assays (ELISAs) (Inbios CHIKjj Detect™ IgM Capture ELISA, Inbios CHIKjj Detect™ IgG ELISA (InBios International Inc., Seattle, WA, USA), Anti-CHIKV ELISA (IgM), Anti- CHIKV ELISA (IgG) (Euroimmun, Lübeck, Germany)). The ichroma detected all 36 anti-CHIKV IgG and 57 anti-CHIKV IgM positivity (100% sensitivity). For 163 anti-CHIKV IgG/IgM negative sera, the ichroma showed one false positive for IgM (99.4% specificity). The ichroma showed no cross-reactivity and no interference. The ichroma demonstrated good diagnostic performance compared to the current ELISAs.
Lee, Heejin,Joo, Ho-yong,Yoon, Chulmin,Lee, Joonbong,Lee, Hojin,Choi, Jinsik,Park, Baeho,Choi, Taekjib Elsevier 2017 Current Applied Physics Vol.17 No.5
<P>Ferroelectric based heterostructures have shown great promises in solar water splitting due to unique photoelectrochemical (PEC) properties including polarization-induced charge separation and tunable electrochemical surface reaction. A highly ordered ferroelectric BiFeO3/TiO2 nanotube (TNT) heterostructures were fabricated by anodic oxidation and pulsed laser deposition. The microscopic morphology, optical, and PEC properties of nanostructures were characterized. The BiFeO3/TNT photoelectrode is photoactive under visible light illumination, which exhibits higher photocurrent from greater water oxidation, compared with the pure TNT photoelectrode. The coating thickness of BiFeO3 strongly affected the photoelectrochemical properties. The enhanced PEC performance could be attributed to the effective charge separation and the favorable band bending for water oxidation, originating from ferroelectric polarization-related internal field. (C) 2017 Elsevier B.V. All rights reserved.</P>
Lee, Wonchan,Choi, Jun-Ho,Ryu, Suho,Jung, Daeseong,Song, Jaewoo,Lee, Jong-Seok,Joo, Chulmin Elsevier 2018 Methods Vol.136 No.-
<P><B>Abstract</B></P> <P>Color-coded light-emitting diode (LED) microscopy (cLEDscope) is a novel computational microscopy technique capable of multi-contrast and quantitative phase imaging of biological specimens using color-multiplexed illumination. Using specially designed LED patterns, it is capable of recording multiple differential phase contrast (DPC) images in a single exposure and employs a computational algorithm to retrieve the phase distribution of the specimens. Herein, we describe the detailed procedures in the cLEDscope implementation for quantitative phase imaging. Several notable features and caveats in the cLEDscope setup and image processing are also outlined. The imaging model is derived for our specific configuration, and the associated phase-retrieval algorithms are presented on the basis of a weak-object transfer function. As an illustrative application of the quantitative cLEDscope, we demonstrate its utility as a sperm-motility analyzer by exploiting its real-time quantitative imaging capability.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Describes quantitative phase imaging in color-coded LED microscopy (q-cLEDscope). </LI> <LI> Detailed procedures and notes for q-cLEDscope implementation are provided. </LI> <LI> Demonstrates motility analysis of human sperm cells via q-cLEDscope. </LI> </UL> </P>