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Kwon, Ik Seon,Kwak, In Hye,Kim, Ju Yeon,Abbas, Hafiz Ghulam,Debela, Tekalign Terfa,Seo, Jaemin,Cho, Min Kyung,Ahn, Jae-Pyoung,Park, Jeunghee,Kang, Hong Seok The Royal Society of Chemistry 2019 Nanoscale Vol.11 No.30
<P>Two-dimensional (2D) MoS2 nanostructures have been extensively investigated in recent years because of their fascinating electrocatalytic properties. Herein, we report 2D hybrid nanostructures consisting of 1T′ phase MoS2 and Fe-phthalocyanine (FePc) molecules that exhibit excellent catalytic activity toward both the hydrogen evolution reaction (HER) and oxygen reduction reaction (ORR). X-ray absorption spectra revealed an increased Fe-N distance (2.04 Å) in the hybrid complex relative to the isolated FePc. Spin-polarized density functional theory calculations predicted that the Fe center moves toward the MoS2 layer and induces a non-planar structure with an increased Fe-N distance of 2.05 Å, which supports the experimental results. The experiments and calculations consistently show a significant charge transfer from FePc to stabilize the hybrid complex. The excellent HER catalytic performance of FePc-MoS2 is characterized by a low Tafel slope of 32 mV dec<SUP>−1</SUP> at a current density of 10 mA cm<SUP>−2</SUP> and an overpotential of 0.123 V. The ORR catalytic activity is superior to that of the commercial Pt/C catalyst in pH 13 electrolyte, with a more positive half-wave potential (0.89 <I>vs</I>. 0.84 V), a smaller Tafel slope (35 <I>vs</I>. 87 mV·dec<SUP>−1</SUP>), and a much better durability (9.3% <I>vs</I>. 40% degradation after 20 h). Such remarkable catalytic activity is ascribed to the HER-active 1T′ phase MoS2 and the ORR-active nonplanar Fe-N4 site of FePc.</P>
Kwon, Ik Seon,Kwak, In Hye,Abbas, Hafiz Ghulam,Jung, Gabin,Lee, Yeron,Park, Jeunghee,Yoo, Seung Jo,Kim, Jin-Gyu,Kang, Hong Seok The Royal Society of Chemistry 2018 Nanoscale Vol.10 No.24
<P>The novel properties of two-dimensional materials have motivated extensive studies focused on transition metal dichalcogenides (TMDs), which led to many interesting findings in recent years. Further advances in this area would require the development of effective methods for producing nanostructured TMDs with a controlled structure. Herein, we report unique MoS2 layered nanostructures intercalated with dimethyl-<I>p</I>-phenylenediamine (DMPD) with various concentrations, synthesized by a one-step hydrothermal reaction. The MoS2 layers possess a significantly expanded interlayer spacing. Remarkably, as the concentration of DMPD increases, the MoS2 preferentially adopts a unique metallic 1T′ (distorted 1T) phase. The intercalated MoS2 exhibits excellent catalytic performance in the hydrogen evolution reaction. First-principles calculations show that the phase transition from 2H to 1T′ phase occurs with increasing concentrations of DMPD, which can be accelerated by the S vacancies. A significant charge transfer from the DMPD molecules to MoS2 stabilizes the 1T′ over the 2H phase, driving the 2H-1T′ phase conversion. The DMPD and the S vacancies increased the carrier concentration, which leads to the enhanced catalytic performance. The present work illustrates how the phase control of TMDs can be effectively achieved by the intercalation of electron-donating molecules.</P>
Kwon, Ik Seon,Kwak, In Hye,Abbas, Hafiz Ghulam,Seo, Hee Won,Seo, Jaemin,Park, Kidong,Park, Jeunghee,Kang, Hong Seok The Royal Society of Chemistry 2019 Nanoscale Vol.11 No.9
<P>Two-dimensional MoS2 meets porphyrin molecules to form unique 1T′ phase intercalated complexes <I>via</I> a one-step procedure of hydrothermal reactions. The resultant Mn-porphyrin-MoS2 exhibits excellent electrocatalytic activity toward the hydrogen evolution reaction, with a Tafel slope of 35 mV dec<SUP>−1</SUP> and 10 mA cm<SUP>−2</SUP> at an overpotential of 0.125 V. Spin-polarized density functional theory calculations confirmed that the intercalation of Mn-porphyrin into 1T′-MoS2 is quite favourable due to strong charge transfer from Mn metals. Their outstanding catalytic performance could be ascribed to the high electron concentration as well as the low activation barrier of the Heyrovsky reaction.</P>
Kwon, Ik Seon,Debela, Tekalign Terfa,Kwak, In Hye,Seo, Hee Won,Park, Kidong,Kim, Doyeon,Yoo, Seung Jo,Kim, Jin-Gyu,Park, Jeunghee,Kang, Hong Seok The Royal Society of Chemistry 2019 Journal of Materials Chemistry A Vol.7 No.40
<P>For the electrochemical reduction of CO2 (CRR) with high selectivity for HCOOH, In-Zn bimetallic nanocrystals (NCs) were synthesized as catalysts by <I>in situ</I> reduction of In2O3-ZnO NCs with various compositions. All In-containing bimetallic catalysts exhibited excellent selectivity to produce HCOOH, while Zn NCs favor CO production. A composition with In : Zn = 0.05 has higher catalytic activity than In NCs, with a faradaic efficiency of 95% and a HCOOH production rate of 0.40 mmol h<SUP>−1</SUP> cm<SUP>−2</SUP> at −1.2 V <I>vs.</I> RHE. The enhanced catalytic performance is in part ascribed to the fewer surface oxide layers, which increase the conductivity and facilitate the charge transfer. Density functional theory calculations revealed that the In-Zn interfacial sites make the HCOOH pathway significantly energy-favorable, which supports the higher production rate of Zn0.95In0.05 than that of In.</P>
Woojin Kwon,Ik-Hwan Kim,Chung-Min Kang,Je Seon Song Asia Association for Disability and Oral Health 2020 대한장애인치과학회지 Vol.16 No.2
In children with disabilities, malocclulsion prevalence is relatively high. Malocclusion negatively affects these patients and reduces quality of life. However, it is often difficult to perform ideal orthodontic treatment due to lack of cooperation. Therefore, simple and feasible plans should be established for patients with disabilities. This case report is on treatment of anterior crossbite using Frankel appliance in a disabled patient. A 6-year-old patient with intellectual disability visited the Department of Pdeiatric Dentistry, Yonsei University Dental Hospitalwith the chief complaint of anterior crossbite. Upon oral examination, The patient was diagnosed with pseudo class III malocclusion. Considering the patient’s medical history and degree of cooperation, it was decided to use the Frankel appliance III, with a focus on resolving the anterior crossbite. The patient was well adapted to the appliance, and the anterior crossbite resolved two months after the start of treatment. Since then, it has been maintained without relapse. The patient and their caregivers were very satisfied with the treatment results.
간 , 담도 및 췌장 : 치료받지 않은 간암환자의 평균 생존기간 및 예후인자에 관한 고찰
장우익(Woo Ik Chang),권상옥(Sang Ok Kwon),이광훈(Kwang Hoon Lee),이흥재(Hong Jai Lee),전근재(Geun Jae Jeon),임채선(Chae Seon Lem),김남동(Nam dong Kim),심영학(Young Hak Shim),홍인수(In Soo Hong) 대한소화기학회 1987 대한소화기학회지 Vol.19 No.2
N/A The survival period and prognostic factors of hepatocellular carcinoma were evaluated in 84 untreated patients confirmed by ultrasound-guided aspiration cytology or histopathology. The results were as follows: 1) In 82 untreated patients, the mean survival period was 16.5 weeks from diagnosis to death. 2) The survival period correlated to age, ascites and weight loss but it did not correlated to bilirubin, albumin, a-FP and the individual groups of Childs classification, 3) According to size and shape the ultrasonographic findings of hepatoma were classified, however the survival period did not correlate to them and also cytologic differentiation. 4) The revised staging system by Primark and staging system by Okuda were not significantly correlated to the survival period.
젠 스텐트 삽입술 후 발생한 스트렙토코커스 인판타리우스 안내염
김동선(Dong Seon Kim),김소희(So Hee Kim),최윤아(Youna Choi),최승권(Seung Kwon Choi),이재정(Jae Jung Lee),박성후(Sung Who Park),변익수(Ik Soo Byon) 대한안과학회 2021 대한안과학회지 Vol.62 No.10
목적: XEN?? Gel Stent와 관련된 Streptococcus infantarius 안내염을 치료한 경험이 있어 이를 보고하고자 한다.증례요약: 75세 남자 환자가 원발개방각녹내장으로 좌안 XEN?? Gel Stent 삽입술을 받은 후 55일째 발생한 안내염으로 본원으로 전원되었다. 시력은 20/50이었다. 세극등현미경검사에서 결막충혈, 전방염증과 축농이 관찰되었으며, 안저에서 유리체내 염증과 삼출성 막이 관찰되었다. XEN?? Gel Stent 제거술, 전방세척술, 전방 및 유리체강내 항생제 주입술, 방수 배양검사를 시행하였다. 시행한 배양검사에서 Streptococcus infantarius가 동정되었다. 술 후 5일째 시력이 안전수동으로 감소하고 염증이 악화되어 추가적인 유리체절제술, 전방세척술, 유리체강내 항생제 주입술을 시행하였다. 유리체절제술 후 16일째 전방염증이, 34일째 맥락막박리가 모두 호전되었다. 술 후 6개월까지 염증은 재발 없이 유지되었으나 시력은 20/100으로 회복에 제한이 있었다. 결론: XEN?? Gel Stent 삽입술 후 발생한 세균성 안내염에서 방수유출장치를 제거하고 유리체절제술과 안내 항생제 치료를 통해 성공적으로 치료가 가능하였다. Purpose: To report a case of Streptococcus infantarius endophthalmitis related to the use of a XEN?? Gel Stent. Case summary: A 75-year-old male was referred to our practice with a diagnosis of endophthalmitis 55 days after XEN?? Gel Stent implantation. He had primary open-angle glaucoma. Visual acuity was 20/50. Slit-lamp examination revealed conjunctival injection and anterior chamber inflammation with hypopyon. Fundus examination showed inflammatory cells with exudative materials in the vitreous. The aqueous sampling for culture of causative micro-organisms was followed by removal of the XEN?? Gel Stent, along with anterior chamber irrigation and intracameral and intravitreal injection of antibiotics. Streptococcus infantarius was isolated after 5 days. Vitrectomy, anterior chamber lavage, and intravitreal injection of antibiotics were additionally performed to control the intraocular inflammation. Sixteen days after vitrectomy, the intraocular inflammation disappeared. The choroidal detachment was resolved 34 days after vitrectomy. Visual improvement was limited to 20/100 at 6 months.Conclusions: XEN?? Gel Stent-related bacterial endophthalmitis was successfully treated by implant removal, vitrectomy, and proper intraocular antibiotic treatment. J Korean Ophthalmol Soc 2021;62(10):1440-1444