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Lee Unhee,김성은,Lee Seung Yeob,Wi Hang Nam,Choi Okja,Park Ji-Won,Kim Dahee,Kim You Jung,Shin Hwa Young,Kim Mihee,Kim Eun Ji,Kang Seung-Ji,Jung Sook-In,Park Kyung-Hwa 대한의학회 2021 Journal of Korean medical science Vol.36 No.24
Background: South Korea has been experiencing a third wave of coronavirus disease 2019 (COVID-19) since mid-November 2020. Our hospital in Gwangju metropolitan city experienced a healthcare-associated COVID-19 outbreak early in the third wave. The first confirmed COVID-19 patient was a symptomatic neurosurgery resident with high mobility throughout the hospital. We analyzed the transmission routes of nosocomial COVID-19 and discussed infection control strategies. Methods: We retrospectively analyzed the severe acute respiratory syndrome coronavirus 2 reverse transcription-polymerase chain reaction (RT-PCR) testing results according to time point and evaluated transmission routes. Results: Since COVID-19 was first confirmed in a healthcare worker (HCW) on 11/13/2020, we performed RT-PCR tests for all patients and caregivers and four complete enumeration surveys for all HCWs. We detected three clusters of nosocomial spread and several sporadic cases. The first cluster originated from the community outbreak spot, where an asymptomatic HCW visited, which led to a total of 22 cases. The second cluster, which included patient-to-patient transmission, originated from a COVID-19 positive caregiver before diagnosis and the third cluster involved a radiologist and a banker. We took measures to isolate Building 1 of the hospital for 17 days and controlled the outbreak during a period of increasing community COVID-19 prevalence. Universal screening of all inpatients upon admission and resident caregivers was made mandatory and hospital-related employees are now screened monthly. Conclusion: Infection control strategies to prevent the nosocomial transmission of emerging infectious diseases must correspond with community disease prevalence. Our data reinforce the importance of multi-time point surveillance of asymptomatic HCWs and routine surveillance of patients and caregivers during an epidemic.
Dahee Lee,Jong Woo Kim 한국경영정보학회 2024 Asia Pacific Journal of Information Systems Vol.34 No.2
Online reviews play a significant role in consumer purchase decisions on e-commerce platforms. To address information overload in the context of online reviews, factors that drive review helpfulness have received considerable attention from scholars and practitioners. The purpose of this study is to explore the differential effects of discrete emotions (anger, disgust, fear, joy, sadness, and surprise) on perceived review helpfulness, drawing on cognitive appraisal theory of emotion and expectation-confirmation theory. Emotions embedded in 56,157 hotel reviews collected from TripAdvisor.com were extracted based on a transfer learning model to measure emotion variables as an alternative to dictionary-based methods adopted in previous research. We found that anger and fear have positive impacts on review helpfulness, while disgust and joy exert negative impacts. Moreover, hotel star-classification significantly moderates the relationships between several emotions (disgust, fear, and joy) and perceived review helpfulness. Our results extend the understanding of review assessment and have managerial implications for hotel managers and e-commerce vendors.
Lee, Dahee,Choi, Eunji,Lee, Jaewon,Oh, Jungju,Lee, Seonyeong,Lee, Minhyung THE KOREAN SOCIETY OF INDUSTRIAL AND ENGINEERING 2018 JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY -S Vol.67 No.-
<P><B>Abstract</B></P> <P>Receptor for advanced glycation end-products (RAGE) is overexpressed in various cancer cells. In this study, a RAGE-binding peptide (RBP) was conjugated to polyethylenimine (25kDa, PEI). RBP-conjugated PEI (PEI-RBP) was characterized as a dual-functional reagent, a RAGE-mediated gene carrier and an anti-angiogenic reagent. As a gene carrier, PEI-RBP had higher transfection efficiency to the C6 glioblastoma cells than PEI. As an anti-angiogenic reagent, the pEmpty/PEI-RBP complex reduced RAGE expression on the surface of the C6 glioblastoma cells. Also, the complex reduced the VEGF expression and tube formation of endothelial cells. Therefore, PEI-RBP may be useful for development of glioblastoma therapy.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
( Dahee Heo ),( Ki Yung Boo ),( Hyeyoung Jwa ),( Hwa Young Lee ),( Jihyun Kim ),( Seong Taeg Kim ),( Hye Mi Seo ),( Sang Hoon Han ),( Young Hee Maeng ),( Jong Hoo Lee ) 대한결핵 및 호흡기학회 2015 Tuberculosis and Respiratory Diseases Vol.78 No.3
Plasmacytomas are extramedullary accumulations of plasma cells originating from soft tissue. Mediastinal plasmacytoma is a rare presentation. A 67-year-old man recovered after antibiotic treatment for community-acquired pneumonia. However, on convalescent chest radiography after 3 months, mass like lesion at the right lower lung field was newly detected. Follow-up chest computed tomography (CT) revealed an increase in the extent of the right posterior mediastinal mass that we had considered to be pneumonic consolidations on previous CT scans. Through percutaneous needle biopsy, we diagnosed IgG kappa type extramedullary plasmacytoma of the posterior mediastinum.
Electrocatalytic Reduction of Gas-Phased CO<sub>2</sub> on Nano-Sized Sn Electrode Surface
Lee, Seunghwa,Ju, HyungKuk,Jeon, Hongrae,Machunda, Revocatus L,Kim, Dahee,Lee, Jae Kwang,Lee, Jaeyoung The Electrochemical Society 2013 ECS transactions Vol.53 No.29
<P>Electrochemical conversion of CO<SUB>2 </SUB>(ECC) is one of the promising approaches which may produce alternative organic chemicals such as HCOOH, CH<SUB>3</SUB>OH and C<SUB>2</SUB>H<SUB>4</SUB>. Use of efficient catalysts and systems are necessarily required to obtain high selectivity and high conversion rate. In this study, nano-sized Sn electrocatalyst for producing formic acid is sprayed onto the gas diffusion electrode and a zero-gap electrolytic cell with the membrane electrode assembly is applied. A constant production of formic acid analyzed by UV-spectroscopy is obtained.</P>
Lee Jaewon,Ha Jihoon,Kim Jun-Hyeong,Seo Dongyeob,Kim Minbeom,Lee Yerin,Park Seong Shil,Choi Dahee,Park Jin Seok,Lee Young Jae,Yang Siyoung,Yang Kyung-Min,Jung Su Myung,Hong Suntaek,Koo Seung-Hoi,Bae Y 생화학분자생물학회 2023 Experimental and molecular medicine Vol.55 No.-
The signaling pathways governing acetaminophen (APAP)-induced liver injury have been extensively studied. However, little is known about the ubiquitin-modifying enzymes needed for the regulation of APAP-induced liver injury. Here, we examined whether the Pellino3 protein, which has E3 ligase activity, is needed for APAP-induced liver injury and subsequently explored its molecular mechanism. Whole-body Peli3−/− knockout (KO) and adenovirus-mediated Peli3 knockdown (KD) mice showed reduced levels of centrilobular cell death, infiltration of immune cells, and biomarkers of liver injury, such as alanine aminotransferase (ALT) and aspartate aminotransferase (AST), upon APAP treatment compared to wild-type (WT) mice. Peli3 deficiency in primary hepatocytes decreased mitochondrial and lysosomal damage and reduced the mitochondrial reactive oxygen species (ROS) levels. In addition, the levels of phosphorylation at serine 9 in the cytoplasm and mitochondrial translocation of GSK3β were decreased in primary hepatocytes obtained from Peli3−/− KO mice, and these reductions were accompanied by decreases in JNK phosphorylation and mitochondrial translocation. Pellino3 bound more strongly to GSK3β compared with JNK1 and JNK2 and induced the lysine 63 (K63)-mediated polyubiquitination of GSK3β. In rescue experiments, the ectopic expression of wild-type Pellino3 in Peli3−/− KO hepatocytes restored the mitochondrial translocation of GSK3β, but this restoration was not obtained with expression of a catalytically inactive mutant of Pellino3. These findings are the first to suggest a mechanistic link between Pellino3 and APAP-induced liver injury through the modulation of GSK3β polyubiquitination.
Lee, Seunghwa,Kim, Dahee,Lee, Jaeyoung WILEY‐VCH Verlag 2015 Angewandte Chemie Vol.54 No.49
<P><B>Abstract</B></P><P>Electrocatalytic conversion of carbon dioxide (CO<SUB>2</SUB>) has recently received considerable attention as one of the most feasible CO<SUB>2</SUB> utilization techniques. In particular, copper and copper‐derived catalysts have exhibited the ability to produce a number of organic molecules from CO<SUB>2</SUB>. Herein, we report a chloride (Cl)‐induced bi‐phasic cuprous oxide (Cu<SUB>2</SUB>O) and metallic copper (Cu) electrode (Cu<SUB>2</SUB>O<SUB>Cl</SUB>) as an efficient catalyst for the formation of high‐carbon organic molecules by CO<SUB>2</SUB> conversion, and identify the origin of electroselectivity toward the formation of high‐carbon organic compounds. The Cu<SUB>2</SUB>O<SUB>Cl</SUB> electrocatalyst results in the preferential formation of multi‐carbon fuels, including <I>n</I>‐propanol and <I>n</I>‐butane C3–C4 compounds. We propose that the remarkable electrocatalytic conversion behavior is due to the favorable affinity between the reaction intermediates and the catalytic surface.</P>