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Surface-functionalized hole-selective monolayer for high efficiency single-junction wide-bandgap and monolithic tandem perovskite solar cells

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Journal of Energy Chemistry 2024年第1期88卷 317-326,I0008页

作者： Devthade Vidyasagar Yeonghun Yun Jae Yu Cho Hyemin Lee Kyung Won kim yong tae kim Sung Woong Yang Jina Jung Won Chang Choi Seonu kim Rajendra Kumar Gunasekaran Seok Beom Kang Kwang Heo Dong Hoe kim Jaeyeong Heo Sangwook Lee School of Materials Science and Engineering Kyungpook National UniversityDaegu 41566Republic of Korea Department of Materials Science and Engineering and Optoelectronics Convergence Research CenterChonnam National UniversityGwangju 61186Republic of Korea Department of Materials Science and Engineering Korea UniversitySeoul 02841Republic of Korea Department of Nanotechnology and Advanced Materials Engineering Sejong UniversitySeoul 05006Republic of Korea

Carbazole moiety-based 2PACz([2-(9H-carbazol-9-yl)ethyl]phosphonic acid)self-assembled monolayers(SAMs)are excellent hole-selective contact(HSC)materials with abilities to excel the charge-transferdynamics of perovskite solar cells(PSCs).Herein,we report a facile but powerful method to functionalize the surface of 2PACz-SAM,by which reproducible,highly stable,high-efficiency wide-bandgap PSCs can be *** 2PACz surface treatment with various donor number solvents improves assembly of 2PACz-SAM and leave residual surface-bound solvent molecules on 2PACz-SAM,which increases perovskite grain size,retards halide segregation,and accelerates hole *** surface functionalization achieves a high power conversion efficiency(PCE)of 17.62%for a single-junction wide-bandgap(~1.77 e V)*** also demonstrate a monolithic all-perovskite tandem solar cell using surfaceengineered HSC,showing high PCE of 24.66%with large open-circuit voltage of 2.008 V and high fillfactor of 81.45%.Our results suggest this simple approach can further improve the tandem device,when coupled with a high-performance narrow-bandgap sub-cell.

关键词： Perovskite solar cells 2PACz Monolithic tandem solar cells Wide bandgap

A 2-Dimensional Micro Flow Sensor with Wide Range Flow Sensing Properties

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稀有金属材料与工程 2006年第A3期35卷 590-594页

作者： tae-yong kim Division of Computer and Information Engineering Dongseo UniversityBusan 617-716Korea

A new silicon micro flow sensor with multiple temperature sensing elements was proposed and numerically simulated in considering wide range flow measuring *** micro flow sensor has three pairs of temperature sensing elements with a central heater compared with typical sensor which has only a temperature sensing element on each side of a central heater.A numerical analysis of the micro flow sensor by Finite Difference Formulation for Heat Transfer Equation was *** nearest pair of temperature sensor showed very good linear sensitivity between 0 to 0.4m/s flow and saturated from 0.75m/s *** the furthest pair of temperature sensor showed some flow sensitivity even though the flow rate of 2.0m/***,this suggested new micro flow meter with multiple temperature sensing elements could be used as a thermal mass flow sensor which has accuracy sensitivity for very wide flow range.

关键词： micro sensor silicon sensor flow sensor 2-D micro flow sensor thermal simulation FDM

Metastasis to the gallbladder:A single-center experience of 20 cases in South Korea

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World Journal of Gastroenterology 2009年第38期15卷 4806-4809页

作者： Won Jae Yoon yong Bum Yoon Youn Joo kim Ji Kon Ryu yong-tae kim Department of Internal Medicine Seoul National University College of Medicine Department of Internal Medicine Korea Cancer Center Hospital

AIM： To evaluate the clinicopathologic characteristics of patients with metastases to the gallbladder （MGBs）. METHODS： We performed a single-center retrospective study of 20 patients with MGBs diagnosed pathologically from 1999 to 2007. RESULTS： Among 417 gallbladder （GB） malignancies, 20 （4.8%） were MGBs. The primary malignancies originated from the stomach （n = 8）, colorectum （n = 3）, liver （n = 2）, kidney （n = 2）, skin （n = 2）, extrahepatic bile duct （n = 1）, uterine cervix （n = 1）, and appendix （n = 1）. Twelve patients were diagnosed metachronously, presenting with cholecystitis （n = 4）, abdominal pain （n = 2）, jaundice （n = 1）, weight loss （n = 1）, and serum CA 19-9 elevation （n = 1）; five patients were asymptomatic. The median survival after the diagnosis of MGB was 8.7 mo. On Cox regression analysis, R0 resection was the only factor associated with a prolonged survival [hazard ratio （HR）： 0.01, P = 0.002]; presentation with cholecystitis was associated with poor survival （HR： 463.27, P = 0.006）. CONCLUSION： MGBs accounted for 4.8% of all pathologically diagnosed GB malignancies. The most common origin was the stomach. The median survival of MGI3 was 8.7 mo.

关键词： Gallbladder Neoplasms Gastrointestinalneoplasms Neoplasm metastasis Biliary tract neoplasms

Optimal biliary drainage for inoperable Klatskin's tumor based on Bismuth type

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World Journal of Gastroenterology 2007年第29期13卷 3948-3955页

作者： Sang Hyub Lee Joo Kyung Park Won Jae Yoon Jun Kyu Lee Ji Kon Ryu yong Bum Yoon yong-tae kim Department of Internal Medicine and Liver Research Institute Seoul National University College of Medicine Seoul South Korea

AIM： To investigate differences in the effects of biliary drainage procedures in patients with inoperable Klatskin＇s tumor based on Bismuth type, considering endoscopic retrograde biliary drainage （ERBD）, external percutaneous transhepatic biliary drainage （EPTBD） and internal biliary stenting via the PTBD tract （IPTBD）. METHODS： The initial success rate, cumulative patency rate, and complication rate were compared retrospectively, according to the Bismuth type and ERBD, EPTBD, and IPTBD. Patency was defined as the duration for adequate initial bile drainage or to the point of the patient＇s death associated with inadequate drainage. RESULTS： One hundred thirty-four patients （93 men, 41 women; 21 Bismuth type Ⅱ, 47Ⅲ, 66 Ⅳ; 34 ERBD, 66 EPTBD, 34 IPTBD） were recruited. There were no differences in demographics among the groups. Adequate initial relief of jaundice was achieved in 91% of patients without a significant difference in the results among different procedures or Bismuth types. The cumulative patency rates for ERBD and IPTBD were better than those for EPTBD with Bismuth type Ⅲ. IPTBD provided an excellent response for Bismuth type IV. However, there was no difference in the patency rate among drainage procedures for Bismuth type Ⅱ. Procedure-related cholangitis occurred less frequently with EPTBD than with ERBD and IPTBD. CONCLUSION： ERBD is recommended as the firstline drainage procedure for the palliation of jaundice in patients with inoperable Klatskin＇s tumor of Bismuth type Ⅱ or Ⅲ, but IPTBD is the best option for Bismuth type Ⅳ.

关键词： Klatskin's tumor Palliation Drainage Bile ducts Intervention

Endoscopic management of occluded metal biliary stents:Metal versus 10F plastic stents

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World Journal of Gastroenterology 2010年第42期16卷 5347-5352页

作者： Won Jae Yoon Ji Kon Ryu Jung Won Lee Dong-Won Ahn yong-tae kim yong Bum Yoon Sang Myung Woo Woo Jin Lee Division of Gastroenterology Department of Internal MedicineSeoul National University College of Medicine101 Daehang-roJongno-guSeoul110-744South Korea Center for Liver Cancer National Cancer Center323 Ilsan-roIlsandong-guGoyang-siGyeonggi-do410-769South Korea

AIM:To compare the efficacy of self-expandable metal stents(SEMSs) with 10F plastic stents(PSs) in the endoscopic management of occluded ***:We retrospectively reviewed the medical records of 56 patients who underwent SEMS insertion for palliation of unresectable malignant biliary obstruction between 2000 and 2007 and subsequent endoscopic retrograde biliary drainage(ERBD) with SEMS or PS for initial SEMS occlusion between 2000 and ***:Subsequent ERBD with SEMS was performed in 29 patients and with PS in *** median time to stent occlusion after subsequent ERBD was 186 d in the SEMS group and 101 d in the PS group(P= 0.118).Overall median stent patency was 79 d for the SEMS group and 66 d for the PS group(P = 0.379).The mean number of additional biliary drainage procedures after subsequent ERBD in patients that died(n = 50) during the study period was 2.54 ± 4.12 for the SEMS group and 1.85 ± 1.95 for the PS group(P = 0.457).The mean total cost of additional biliary drainage procedures after the occlusion of subsequent SEMS or PS was $410.04 ± 692.60 for the SEMS group and $630.16 ± 671.63 for the PS group(P = 0.260).Tumor ingrowth as the cause of initial SEMS occlusion was the only factor associated with a shorter time to subsequent stent occlusion(101 d for patients with tumor ingrowth vs 268 d for patients without tumor ingrowth,P = 0.008).CONCLUSION:Subsequent ERBD with PSs offered similar patency and number of additional biliary drainage procedures compared to SEMSs in the management of occluded SEMS.

关键词： Stents Biliary tract neoplasms Obstructive jaundice Endoscopy Endoscopic retrograde cholangiopancreatography

Tidal effects based on a GUP-induced effective metric

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Communications in Theoretical Physics 2024年第9期76卷 63-72页

作者： Soon-tae Hong yong-Wan kim Young-Jai Park Center for Quantum Spacetime and Department of Physics Sogang UniversitySeoul 04107Republic of Korea Department of Physics and Research Institute of Physics and Chemistry Jeonbuk National UniversityJeonju 54896Republic of Korea Department of Physics Sogang UniversitySeoul 04107Republic of Korea

In this paper,we study tidal forces in the Schwarzschild black hole,whose metric explicitly includes a generalized uncertainty principle(GUP)*** also investigate interesting features of the geodesic equations and tidal effects that are dependent on the GUP parameterαrelated to a minimum ***,by solving the geodesic deviation equations explicitly with appropriate boundary conditions,we show thatαin the effective metric affects both the radial and angular components of the geodesic equation,particularly near the singularities.

关键词： generalized uncertainty principle geodesic deviation equation effective metric

Biliary drainage for obstructive jaundice caused by unresectable hepatocellular carcinoma: the endoscopic versus percutaneous approach

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Hepatobiliary & Pancreatic Diseases International 2012年第6期11卷 636-642页

作者： Jongkyoung Choi Ji Kon Ryu Sang Hyub Lee Dong-Won Ahn Jin-Hyeok Hwang yong-tae kim yong Bum Yoon Joon Koo Han Department of Internal Medicine and Liver Research Institute Seoul National University College of Medicine Seoul Korea Department of Internal Medicine National Medical Center Seoul Korea Department of Internal Medicine Seoul National University Bundang Hospital Seongnam Gyeonggi-do Korea Department of Internal Medicine Seoul National University Boramae Medical Center Seoul Korea Department of Radiology Seoul National University College of Medicine Seoul Korea

BACKGROUND: For palliative treatment of the obstructive jaundice associated with unresectable hepatocellular carcinoma (HCC), percutaneous transhepatic biliary drainage (PTBD) or endoscopic retrograde biliary drainage (ERBD) has been performed. PTBD is preferred as an initial procedure. Little is known about the better option for patients with obstructive jaundice caused by unresectable HCC. METHODS: Sixty patients who had received ERBD or PTBD for the palliative treatment of obstructive jaundice caused by unresectable HCC between January 2006 and May 2010 were included in this retrospective study. Successful drainage, drainage patency, and the overall survival of patients were evaluated. RESULTS: Univariate analysis revealed that the overall frequency of successful drainage was higher in the ERBD group (22/29, 75.9%) than in the PTBD group (15/31, 48.4%) (P=0.029); but multivariate analysis showed marginal significance (P=0.057). The duration of drainage patency was longer in the ERBD group than in the PTBD group (82 vs 37 days, respectively, P=0.020). Regardless of what procedure was performed, the median survival time of patients who had a successful drainage was much longer than that of the patients who did not have a successful drainage (143 vs 38 days, respectively, P<0.001).CONCLUSION: Besides PTBD, ERBD may be used as the initial treatment option to improve obstructive jaundice in patients with unresectable HCC if there is a longer duration of drainage patency after a successful drainage.

关键词： hepatocellular carcinoma obstructive jaundice endoscopic retrograde biliary drainage percutaneous transhepatic biliary drainage

Effect of silicon carbide-based iron catalyst on reactor optimization for non-oxidative direct conversion of methane

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Journal of Energy Chemistry 2023年第6期81卷 519-532,I0012页

作者： Eun-hae Sim Sung Woo Lee Jin Ju Lee Seung Ju Han Jung Ho Shin Gracia Lee Sungrok Ko Kwan-Young Lee yong tae kim C1 Gas&Carbon Convergent Research Center Korea Research Institute of Chemical TechnologyDaejeon 34114Republic of Korea Department of Chemical and Biological Engineering Korea University145 Anam-roSeoul 02841Republic of Korea Department of Chemical and Biomolecular Engineering Yonsei University50 Yonsei-roSeoul 03722Republic of Korea Chemical Data-Driven Research Center Korea Research Institute of Chemical TechnologyDaejeon 34114Republic of Korea Prospective Tech.Exploring Section Basic Chemical R&D centerLottechemical Corp.Daejeon 34059Republic of Korea Department of Advanced Materials and Chemical Engineering University of Science and Technology(UST)Gajeong-dongYuseongDaejeon 34113Republic of Korea

The conversion of methane to olefins,aromatics,and hydrogen(MTOAH)can be used to stably obtain hydrocarbons when the effect of the catalytic surface is optimized from the reaction engineering *** this study,Fe/Si C catalysts were packed into a quartz tube *** catalytic surfaces of Si C and the impregnated Fe species decreased the apparent activation energies(E_a)of methane consumption in the blank reactor between 965 and 1020℃.Consequently,the hydrocarbon yield increased by 2.4times at 1020℃.Based on the model reactions of ethane,ethylene,and acetylene mixed with hydrogen in the range of 500-1020℃,an excess amount of Fe in the reactor favored the C-C coupling reaction over the selective hydrogenation of acetylene;consequently,coke formation was favored over the hydrogenation *** gas-phase reactions and catalyst properties were optimized to increase hydrocarbon yields while reducing coke *** 0.2Fe catalyst-packed reactor(0.26 wt%Fe)resulted in a hydrocarbon yield of 7.1%and a coke selectivity of<2%when the ratio of the void space of the postcatalyst zone to the catalyst space was adjusted to be≥*** on these findings,the facile approach of decoupling the reaction zone between the catalyst surface and the gas-phase reaction can provide insights into catalytic reactor design,thereby facilitating the scale-up from the laboratory to the commercial scale.

关键词： Non-oxidative methane conversion Ethylene Aromatic Methane pyrolysis Fe/SiC Coke resistance Catalytic reactor

Removal of intrahepatic bile duct stone could reduce the risk of cholangiocarcinoma: A single-center retrospective study in South Korea

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World Journal of Clinical Cases 2024年第5期12卷 913-921页

作者： tae In kim Sung yong Han Jonghyun Lee Dong Uk kim Division of Gastroenterology Biomedical Research InstitutePusan National University HospitalBusan 49241South Korea Department of Internal Medicine Pusan National UniversityCollege of MedicineYangsan 50612South Korea

BACKGROUND Intrahepatic duct(IHD)stones are among the most important risk factors for cholangiocarcinoma(CCC).Approximately 10%of patients with IHD stones develop CCC;however,there are limited studies regarding the effect of IHD stone removal on CCC *** To investigate the association between IHD stone removal and CCC *** We retrospectively analyzed 397 patients with IHD stones at a tertiary referral center between January 2011 and December *** CCC occurred in 36 of the 397 enrolled *** univariate analysis,chronic hepatitis B infection(11.1%vs 3.0%,P=0.03),carbohydrate antigen 19-9(CA19-9,176.00 vs 11.96 II/mL,P=0.010),stone located in left or both lobes(86.1%vs 70.1%,P=0.042),focal atrophy(52.8%vs 26.9%,P=0.001),duct stricture(47.2%vs 24.9%,P=0.004),and removal status of IHD stone(33.3%vs 63.2%,Pupper normal limit,carcinoembryonic antigen>upper normal limit,stones located in the left or both lobes,focal atrophy,and complete removal of IHD stones without recurrence were independent factors influencing CCC ***,the type of removal method was not associated with CCC *** Complete removal of IHD stones without recurrence could reduce CCC risk.

关键词： Intrahepatic bile duct stone Cholangiocarcinoma Percutaneous transhepatic cholangioscopy Endoscopic retrograde cholangiopancreatography Carbohydrate antigen 19-9