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Nano Research 2018年第12期11卷 6283-6293页

作者： Jongmoon Shin Maengsuk Kim Sujeong Jung Chang Su Kim Jucheol Park Aeran Song kwun-bum chung Sung-Ho Jin Jun Hee Lee Myungkwan Song Surface Technology Division Korea Institute of Materials Science (K/MS)797ChangwondaeroSungsan-GuChangwonGyeongnam642-83IRepublic of Korea School of Energy and Chemical Engineering Ulsan Nationallnstitute ofSdence &Technology(UNIST)Ulsan44919Republic of Korea Structure Analysis Group Gyeongbuk Science &Technology Promotion CenterFuture Strategy Research Institute17Cheomdangieop 1-roSangdong-myeonGumiGyeongbuk39171Republic of Korea Division of Physics andSemiconductorScience Dongguk UniversitySeou1100-715Repubfic of Korea Department of Chemistry Education Graduate Department of Chemical Materialsand Institute for Plastic Information and Energy MaterialsPusan National UniversityBusan 46241Republicof Korea

Despite the excellent merits of lead perovskite solar cells, their instability and toxicity still present a bottleneck for practical applications. Bismuth perovskite has emerged as a candidate for photovoltaic (PV) applications, because it not only has a low toxicity but is also stable in air. However, the power conversion efficiency (PCE) remains an unsolved problem. We performed band gap tuning experiments to improve the efficiency. The absorption of ABi3I10 structure films was extended within the visible region, and the optical band gap was decreased considerably compared to that for Cs3Bi2I9. Furthermore, we explained the correlation between the structure and the optical properties via a first-principles study. A device employing CsBi3I10 as a photoactive layer exhibits a PCE of 1.51% and an excellent ambient stability over 30 days.

关键词： solar cells perovskite band-gap engineering bismuth halide lead free

Influence of the electrolyte conductivity on the critical current density and the breakdown voltage

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Chinese Journal of Chemical Engineering 2023年第7期59卷 169-175页

作者： Hae-Kyun Park Dong-Hyuk Park bum-Jin chung Department of Nuclear Engineering Kyung Hee University 1732 Deogyeong-daeroGiheung-guYongin-siGyeonggi-do 17104Korea

The work investigates influence of the electrolyte conductivity on the onset of partial contact glow discharge electrolysis(CGDE)in a water *** current density(CCD)and breakdown voltage were measured together with in situ observation of hydrogen bubble behavior,whose influence has not been focused *** a fixed current during normal electrolysis,hydrogen coalescence adjacent to cathode surface was invigorated at a lower *** analyses elucidated the hydrogen coalescence characteristics by quantifying size and population of detached hydrogen *** CCD increased about 104% within given range of conductivity(11.50-127.48 mS·cm^(-1))due to impaired bubble coalescence,which delays hydrogen film formation on the ***,decreasing trend of breakdown voltage was measured with increased conductivity showing maximum drop of 74%.It is concluded that onset of partial CGDE is directly affected by hydrodynamic bubble behaviors,whereas the electrolyte conductivity affects the bubble formation characteristics adjacent to cathode electrode.

关键词： Water electrolysis Critical current density Breakdown voltage Electrolyte conductivity Hydrogen bubble behavior

Rapidly growing primary anal canal lymphoma:a case report and literature review

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Gastroenterology Report 2023年第1期11卷 582-584页

作者： Yu Kyung chung Su bum Park Department of Internal Medicine Pusan National University School of Medicine and Research Institute for Convergence of Biomedical Science and TechnologyPusan National University Yangsan HospitalYangsanRepublic of Korea

Introduction Anal cancer is a rare cancer accounting for2%of all gastrointestinal tract malignancies[1].Among anal cancers,squamous cell cancer(SCC)is the most common and lymphoma is one of the least *** gastrointestinal tract is the most common site for extranodal non-Hodgkin’s lymphoma(NHL),and diffuse large B-cell lymphoma(DLBCL)is the most common histologic ***,primary colorectal lymphoma accounts for only 0.3%of all large intestinal malignancies and3%of all gastrointestinal lymphomas[2].Anal canal SCC and lymphomas are treated differently;thus,accurate diagnosis is crucial.

关键词： lymphoma gastrointestinal diagnosis

Formation of FeMo_2B_2 phase in boron containing 9Cr-1.5Mo ferritic steels

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Rare Metals 2006年第Z2期25卷 213-219页

作者： JUNG Woo-Sang HONG Suk-Woo SONG Sang-Min SOOK-In kwun chung Soon-Hyo Materials Science & Technology Division Korea Institute of Science & Technology Seoul 136-791 Korea Department of Materials Science and Engineering Korea University Seoul 136-713 Korea

The segregation and diffusion of boron during heat treatments were studied. The influence of boron contents, aging time and applied stress on FeMo2B2 formation was also studied. Finally, the effects of boron contents and FeMo2B2 formation on the high temperature strength were studied. Boron atoms were segregated to prior austenite grain boundary during normalizing treatment. And these boron atoms were slowly diffused into the grain interior during tempering and aging at 700 ℃. The FeMo2B2 phase was only formed after 1,000 h aging at 700 ℃ in alloy containing 196 ppm boron. The formation of FeMo2B2 phase is accelerated by the applied stress. It was expected that the formation of FeMo2B2 is closely related to the redistribution of boron atoms. The tensile strengths at 700 ℃ are increased with the increase of boron contents. However, the formation of FeMo2B2 phase results in lower tensile strength.

关键词： 9Cr-1.5Mo ferritic steels precipitation behavior boron effect FeMo2B2 phase tensile strength

Effect of pronase as mucolytic agent on imaging quality of magnifying endoscopy

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World Journal of Gastroenterology 2015年第8期21卷 2483-2489页

作者： Gwang Ha Kim Yu Kyung Cho Jae Myung Cha Sun-Young Lee Il-kwun chung Department of Internal Medicine Pusan National University School of Medicine Department of Internal Medicine The Catholic University of Korea Department of Internal Medicine Kyung Hee University Hospital at Gang Dong Department of Internal Medicine Konkuk University Medical Center Department of Internal Medicine Soonchunhyang University

AIM:To investigate the efficacy of premedication with pronase,a proteolytic enzyme,in improving imagequality during magnifying ***:The study was of a blinded,randomized,prospective *** were assigned to groups administered oral premedication of either pronase and simethicone(Group A)or simethicone alone(Group B).First,the gastric mucosal visibility grade(1-4)was determined during conventional endoscopy,and then a magnifying endoscopic examination was *** quality of images obtained by magnifying endoscopy at the stomach and the esophagus was scored from1 to 3,with a lower score indicating better *** endoscopist used water flushes as needed to obtain satisfactory magnifying endoscopic *** main study outcomes were the visibility scores during magnifying endoscopy and the number of water ***:A total of 144 patients were enrolled,and data from 143 patients(M:F=90:53,mean age 57.5 years)were *** visibility score was significantly higher in the stomach following premedication with pronase(73%with a score of 1 in Group A vs 49%in Group B,P<0.05),but there was no difference in the esophagus visibility scores(67%with a score of 1in Group A vs 58%in Group B).Fewer water flushes[mean 0.7±0.9 times(range:0-3 times)in Group A vs 1.9±1.5 times(range:0-6 times)in Group B,P<0.05]in the pronase premedication group did not affect the endoscopic procedure times[mean 766 s(range:647-866 s)for Group A vs 760 s(range:678-854 s)for Group B,P=0.88].The total gastric mucosal visibility score was also lower in Group A(4.9±1.5 vs 8.3±1.8in Group B,P<0.01).CONCLUSION:The addition of pronase to simethicone premedication resulted in clearer images during magnifying endoscopy and reduced the need for water flushes.

关键词： Pronase Narrow-band imaging,EndoscopyImage enhance

Endoscopic submucosal dissection for early gastric cancer:Quo vadis?

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World Journal of Gastroenterology 2011年第21期17卷 2623-2625页

作者： Won Young Cho Joo Young Cho Il kwun chung Jin Il Kim Jin Seok Jang Jae Hak Kim Institute for Digestive Research Digestive Disease CenterSoonchunhyang University College of Medicine Department of Internal Medicine Soonchunhyang University College of Medicine Department of Internal Medicine College of MedicineThe Catholic University of KoreaSeoul Department of Internal Medicine Dong-A University College of Medicine Department of Internal Medicine Dongguk University College of Medicine

The diagnosis of early gastric cancer(EGC) is of great interest because its endoscopic and surgical treatment presents the best chance for a *** technical development,endoscopic submucosal dissection(ESD) has been widely performed for the curative treatment of EGC in *** studies of ESD for EGC will be the next missions that overcome these limitations and global guidelines will be processed for ESD for EGC.

关键词： Endoscopic submucosal dissection Early gastric cancer

Double layered self-expanding metal stents for malignant esophageal obstruction, especially across the gastroesophageal junction

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World Journal of Gastroenterology 2012年第28期18卷 3732-3737页

作者： Min Dae Kim Su bum Park Dae Hwan Kang Jae Hyung Lee Cheol Woong Choi Hyung Wook Kim chung Uk chung Young Il Jeong Department of Internal Medicine Bongseng Memorial Hospital Busan 601-723 South Korea Department of Internal Medicine Pusan National University School of Medicine and Research Institute for Convergence of Biomedical Science and Technology Pusan National University Yangsan Hospital Yangsan 626-770 South Korea

AIM: To evaluate the clinical outcomes of double-layered self-expanding metal stents (SEMS) for treatment of malignant esophageal obstruction according to whether SEMS crosses the gastroesophageal junction (GEJ). METHODS: Forty eight patients who underwent the SEMS insertion for malignant esophageal obstruction were enrolled. Patients were classified as GEJ group (SEMS across GEJ, 18 patients) and non-GEJ group (SEMS above GEJ, 30 patients) according to SEMS position. Double layered (outer uncovered and inner covered stent) esophageal stents were placed. RESULTS: The SEMS insertion and the clinical improvement were achieved in all patients in both groups. Stent malfunction occurred in seven patients in the GEJ group and nine patients in the non-GEJ group. Tumor overgrowth occurred in five and eight patients, respectively, food impaction occurred in one patient in each group, and stent migration occurred in one and no patient, respectively. There were no significant differences between the two groups. Reflux esophagitis occurred more frequently in the GEJ group (eight vs five patients, P = 0.036) and was controlled by proton pump inhibitor. Aspiration pneumonia occurred in zero and five patients, respectively, and tracheoesophageal fistula occurred in zero and two patients, respectively. CONCLUSION: Double-layered SEMS are a feasible and effective treatment when placed across the GEJ for malignant esophageal obstruction. Double-layered SEMS provide acceptable complications, especially migration, although reflux esophagitis is more common in the GEJ group.

关键词： Metal stent Gastroesophageal junction Malignant esophageal obstruction

In situ synthesis of chemically bonded NaTi2（PO4）3/rGO 2D nanocomposite for high-rate sodium-ion batteries

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Nano Research 2016年第6期9卷 1844-1855页

作者： Ha-Kyung Roh Hyun-Kyung Kim Myeong-Seong Kim Dong-Hyun Kim Kyung Yoon chung Kwang Chul Roh Kwang-bum Kim Department of Material Science & Engineering Yonsei University 50 Yonsei-ro Seodaemun-gu Seou103722 Republic of Korea Department of Materials Science and Metallurgy University of Cambridge 27 Charles Babbage Road Cambridge CB30FS UK Center for Energy Convergence Korea Institute of Science and Technology 5 Hwarang-ro 14-gil Seongbuk-gu Seou102792 Republic of Korea Energy & Environmental Division Korea Institute of Ceramic Engineering & Technology 101 Soho-ro Jinju-si Gyeongsangnam-do 52851 Republic of Korea

A phase-pure NaTi2（PO4）3/reduced graphene oxide （rGO） nanocomposite was prepared using a microwave-assisted one-pot method and subsequent heat treatment. The well-crystallized NaTi2（PO4）3 nanoparticles （30-40 nm） were uniformly precipitated on rGO templates through Ti-O-C bonds. The chemical interactions between the NaTi2（PO4）3 nanoparticles and rGO could immobilize the NaTi2（PO4）3 nanoparticles on the rGO sheets, which might be responsible for the excellent electrochemical performance of the nanocomposite. The NaTi2（PO4）B/rGO nanocomposite exhibited a specific capacity of 128.6 mA-h.g-1 approaching the theoretical value at a 0.1 C-rate with an excellent rate capability （72.9% capacity retention at 50 C-rate） and cycling performance （only 4.5% capacity loss after 1,000 cycles at a high rate of 10 C）. These properties were maintained even when the electrodes were prepared without the use of an additional conducting agent. The excellent sodium storage properties of the NaTi2（PO4）B/rGO nanocomposite could be attributed to the nano-sized NaTi2（PO4）3 particles, which significantly reduced the transport lengths for Na＋ ions, and an intimate contact between the NaTi2（PO4）3 particles and rGO due to chemical bonding.

关键词： NaTi2(PO4)dreducedgraphene oxide (rGO)nanocomposite chemical bonding energy-efficiency in situ synthesis high-rate sodium-ion batteries

Aortoduodenal fistula and aortic aneurysm secondary to biliary stent-induced retroperitoneal perforation

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World Journal of Gastroenterology 2008年第19期14卷 3095-3097页

作者： Tae Hoon Lee Do Hyun Park Ji-Young Park Suck-Ho Lee Il-kwun chung Hong Soo Kim Sang-Heum Park Sun-Joo Kim Division of Gastroenterology Department of Internal MedicineSoonchunhyang University College of Medicine Division of Gastroenterology Department of Internal MedicineUniversity of Ulsan College of Medicine

Duodenal perforations caused by biliary prostheses are not uncommon, and they are potentially life threatening and require immediate treatment. We describe an unusual case of aortic aneurysm and rupture which occurred after retroperitoneal aortoduodenal fistula formation as a rare complication caused by biliary metallic stent-related duodenal perforation. To our knowledge, this is the first report describing a lethal complication of a bleeding, aortoduodenal fistula and caused by biliary metallic stent-induced perforation.

关键词： Stents Retroperitoneal perforation Aorticaneurysm Fistula

Modified rendezvous intrahepatic bile duct cannulation technique to pass a PTBD catheter in ERCP

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World Journal of Gastroenterology 2010年第42期16卷 5388-5390页

作者： Tae Hoon Lee Sang-Heum Park Sae Hwan Lee Chang-Kyun Lee Suck-Ho Lee Il-kwun chung Hong Soo Kim Sun-Joo Kim Division of Gastroenterology Department of Internal MedicineSoon Chun Hyang University College of MedicineCheonan Hospital23-20 Bongmyung-dongCheonan-siChungcheongnam-do330-721South Korea

The rendezvous procedure combines an endoscopic technique with percutaneous transhepatic biliary drainage(PTBD).When a selective common bile duct cannulation fails,PTBD allows successful drainage and retrograde access for subsequent rendezvous ***,rendezvous procedures such as the PTBDassisted over-the-wire cannulation method,or the parallel cannulation technique,may be available when a bile duct cannot be selectively *** selective intrahepatic bile duct(IHD) cannulation fails,this modified rendezvous technique may be a feasible *** report the case of a modified rendezvous technique,in which the guidewire was retrogradely passed into the IHD through the C2 catheter after end-to-end contact between the tips of the sphincterotome and the C2 catheter at the ampulla's orifice,in a 39-year-old man who had been diagnosed with gallbladder carcinoma with a metastatic right IHD *** this procedure may be a feasible and timesaving technique.

关键词： Endoscopic retrograde cholangiopancreatography Intrahepatic bile duct Rendezvous technique