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Han, Yujin,Choi, Keunsu,Oh, Hyeonmyeong,Kim, Chanseok,Jeon, Dasom,Lee, Cheolmin,Lee, Jun Hee,Ryu, Jungki Elsevier 2018 Journal of catalysis Vol.367 No.-
<P><B>Abstract</B></P> <P>Highly efficient water-oxidation catalysts (WOCs) were readily prepared through the simple heat treatment of cobalt-containing polyoxometalate [Co<SUB>4</SUB>(H<SUB>2</SUB>O)<SUB>2</SUB>(PW<SUB>9</SUB>O<SUB>34</SUB>)<SUB>2</SUB>]<SUP>10−</SUP> (POM). The annealing of soluble POM molecules at high temperatures in air led to the formation of insoluble nanoparticles, of which the crystal structure and catalytic activity can be controlled by the annealing temperature. POMs were converted to amorphous and crystalline CoWO<SUB>4</SUB> nanoparticles when annealed at 400 and 500 °C, respectively. Interestingly, amorphous CoWO<SUB>4</SUB> nanoparticles exhibited excellent catalytic activity near the neutral pH of pH 8.0, making them superior to both pristine POM and POM-derived crystalline CoWO<SUB>4</SUB> nanoparticles. X-ray absorption and photoelectron spectroscopies combined with density functional theory (DFT) calculations revealed that their outstanding performance was resulted from the generation of large amounts of oxygen vacancies upon annealing, leading to the optimum distance between the nearest Co ions for the Langmuir-Hinshelwood (LH) mechanism. Based on these findings, we could readily immobilize CoWO<SUB>4</SUB>-based WOCs on the surfaces of various electrodes for efficient electrochemical and photoelectrochemical water oxidation through the annealing of POMs pre-adsorbed onto the desired electrode surface. This study may provide insights not only for the synthesis of efficient electrocatalysts derived from POMs but also for their immobilization onto the desired electrode surface for practical applications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> POMs were converted to CoWO<SUB>4</SUB> nanoparticles by annealing. </LI> <LI> POM-derived a-CoWO<SUB>4</SUB> exhibited excellent catalytic activity for water oxidation. </LI> <LI> Its catalytic activity was closely related to the formation of oxygen vacancies. </LI> <LI> It was readily integrated on a desired surface by adsorption and annealing of POMs. </LI> <LI> This enabled simple preparation of efficient (photo)anodes for water oxidation. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Han, Yujin World Association for Triple Helix and Future Stra 2020 Journal of Contemporary Eastern Asia Vol.19 No.2
From 1959 to 1984, over 93,000 Koreans moved to North Korea from Japan as part of a repatriation project conducted during this time. Among them were people who had escaped from North Korea and immigrated to Japan and South Korea as well as the descendants of such people. This research examines the immigration trajectories of North Korean defectors related to the repatriation project and its effects on international relations in East Asia in a migration systems context. Specifically, it focuses on 26 North Korean defectors who have connections with Japan and settled in Japan and South Korea. It argues that the migration pathways of North Korean defectors linked with the repatriation project have been constructed with the cooperation of and amidst conflict between East Asian countries. To respond to the situation, North Korean defectors used their connections with Japan in amicable relations between Japan and China. However, after the relations went sour, defectors turned to informal transitional networks. If these strategies were unavailable, the defectors faced difficulties, unless they received social or capital support from the destination countries. After entering the destination country, those who settled in Japan have experienced different situations due to the inconsistency in administrative proceedings, while those in South Korea have been treated equally as other defectors. In this sense, some defectors have faced precarious situations in their immigration.
Ocular comorbidities in patients with rosacea : A case-control study
( Yujin Han ),( Se Hoon Lee ),( Eun Sun Hong ),( Yu Ri Woo ),( Hei Sung Kim ),( Jeong Deuk Lee ),( Sang Hyun Cho ) 대한피부과학회 2020 대한피부과학회 학술발표대회집 Vol.72 No.1
Background: Rosacea is a common acquired inflammatory skin disorder. Although clinical phenotyeps of rosacea includes a variety of ocular manifestations, detailed data on ocular comorbidities among patients with rosacea are still scant. Objectives: This study aimed to investigate the association between rosacea and ocular comorbidities in Korea. Methods: We performed a large multi-center case-control study using a multicenter hospital database in Korea from 2007 to 2018. Conditional logistic regression analyses were performed to compare the risk of ocular comorbidities between two groups. Results: A total of 12,936 cases with rosacea and 12,936 age-, sex-, skin phototype-matched controls without rosacea were enrolled. Patients with rosacea were found to be at increased risk of having blepharitis (adjusted odds ratio [aOR] 3.44; 95% confidence interval [CI] 2.71-4.36), glaucoma (aOR 1.93; 95% CI, 1.70-2.20), conjunctivitis (aOR 1.65; 95% CI, 1.50-1.82), and lacrimal disorder (aOR 1.52; 95% CI, 1.41-1.63). Conclusion: This study confirms a significant association between rosacea and ocular comorbidities in the Korean population. Of note, we found that increased risk of glaucoma, which could increase the risk of ocular morbidity. Therefore, ophthalmological referral for patients with cutaneous rosacea is needed to provide optimal management of rosacea.
Role of human papillomavirus in development of skin tags
( Yujin Han ),( Se Hoon Lee ),( Eun Sun Hong ),( Yu Ri Woo ),( Hei Sung Kim ),( Jeong Deuk Lee ),( Sang Hyun Cho ) 대한피부과학회 2020 대한피부과학회 학술발표대회집 Vol.72 No.1
Background: Skin tag is a commonly encountered benign cutaneous tumor located frequently in the intertriginous area. To date, the etiology of skin tag has been poorly understood. Objectives: This study is aimed to clarify the biological relevance of specific types of human papillomavirus in the pathogenesis of skin tags. Methods: Lesional skin samples of skin tags and healthy controls as negative controls and lesional skin samples of patients with condyloma as positive controls were retrieved. By using multiplex real-time polymerase chain reaction amplication and melting curve analysis, presence of 20 high risk and 20 low risk human papillomavirus types were analyzed. Results: On multiplex real-time polymerase chain reaction analysis, the presence of 20 high-risk human papillomavirus types or 20 low-risk human papillomavirus types was not observed in all specimens from patients with skin tags. Human papillomavirus 6 (n = 2), 11 (n = 2) and 54 (n = 1) types were detected in positive controls. Polymerase chain reactions for negative controls showed negative results among the tested human papillomavirus types. Conclusion: Although the specific types of human papillomavirus might be associated with the causation of skin tags, our pilot study showed the lack of association between 20 high-risk and 20 low-risk human papillomavirus types and skin tags.