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Ternary layered double hydroxide oxygen evolution reaction electrocatalyst for anion exchange membrane alkaline seawater electrolysis

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Journal of Energy Chemistry 2022年第12期75卷 127-134,I0004页

作者： Yoo Sei Park jae-Yeop Jeong Myeong Je jang Chae-Yeon Kwon Geul Han Kim jaehoon Jeong Ji-hoon Lee Jooyoung Lee Sung Mook Choi Department of Hydrogen Energy Materials Surface&Nano Materials DivisionKorea Institute of Materials Science(KIMS)Changwon 51508Republic of Korea Department of Advanced Material Engineering Chungbuk National University1 Chungdae-roSeowon-guCheongjuChungbuk 28644Republic of Korea Department of Chemical Engineering University of WaterlooWaterlooOntario N2L 3G1 Canada School of Materials Science and Engineering Gyeongsang National UniversityJinju 52828Republic of Korea Department of Materials Science and Engineering Pusan National UniversityBusan 46241Republic of Korea Energy Industry Support Center Daegu Mechatronics&Materials InstituteDaegu 42704Republic of Korea Advanced Materials Engineering University of Science and Technology(UST)Yuseong-guDaejeon 34113Republic of Korea

Anion exchange membrane(AEM)water electrolyzers are promising energy devices for the production of clean hydrogen from ***,the lack of active and robust electrocatalysts for the oxygen evolution reaction(OER)severely impedes the development of this *** this study,a ternary layered double hydroxide(LDH)OER electrocatalyst(NiFeCo-LDH)is developed for high-performance AEM alkaline seawater *** AEM alkaline seawater electrolyzer catalyzed by the NiFeCo LDH shows high seawater electrolysis performance(0.84 A/cm^(2)at 1.7 Vcell)and high hydrogen production efficiency(77.6%at 0.5 A/cm^(2)),thus outperforming an electrolyzer catalyzed by a benchmark IrO_(2)*** NiFeCo-LDH electrocatalyst greatly improves the kinetics of the AEM alkaline seawater electrolyzer,consequently reducing its activation loss and leading to high *** on the results,this NiFeCo-LDH-catalyzed AEM alkaline seawater electrolyzer can likely surpass the energy conversion targets of the US Department of Energy.

关键词： Anion exchange membranes water electrolysis Oxygen evolution reactions Alkaline seawater electrolysis Hydrogen production

Diagnostic performance of the current risk-stratified approach with computed tomography for suspected choledocholithiasis and its options when negative finding

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Hepatobiliary & Pancreatic Diseases International 2019年第4期18卷 366-372页

作者： Hyun Woo Lee Tae Jun Song Do Hyun Park Sang Soo Lee Dong-Wan Seo Sung Koo Lee Myung-Hwan Kim jae hyuck Jun Ji Eun Moon Yeon Han Song Digestive Disease Center and Research Institute Department of Internal MedicineSoonchunhyang University School of MedicineBucheonKorea Division of Gastroenterology Department of Internal MedicineUniversity of Ulsan College of MedicineAsan Medical CenterSeoulKorea Division of Gastroenterology Department of Internal MedicineUniversity of Eulji College of MedicineEulji Medical CenterDaejeonKorea Department of Biostatistics Clinical trial centerSoonchunhyang University Bucheon HospitalBucheonKorea

Background:Several studies evaluated the current guideline of the American Society for Gastrointestinal Endoscopy(ASGE)and reported only suboptimal *** study evaluated the diagnostic performance of the ASGE guideline based on computed tomography(CT)and role of endoscopic ultrasonography(EUS)and magnetic resonance cholangiopancreatography(MRCP)in patients with suspected choledocholithiasis but negative CT ***:Patients with suspected choledocholithiasis undergoing ERCP between January 2016 and January 2017 were retrospectively *** patients underwent CT to detect *** or MRCP was performed when the CT scan showed negative *** were classified into the high and intermediate-risk groups,based on predictors from the ASGE ***:Of 583 patients with suspected choledocholithiasis,340(58.3%)had stones on ERCP(65.9%in the high-risk group and 40.6%in the intermediate-risk group).The accuracy of ASGE guideline for CT was 63.98%(79.12%sensitivity,42.80%specificity)and 36.02%(20.88%sensitivity,57.20%specificity)in the high-risk and intermediate-risk groups,*** 103 patients in the high-risk group underwent both CT and US,the accuracy of CT was higher than that of US for detecting choledocholithiasis(78.64%vs.53.40%),with a significant difference in area under the curve(AUC)(0.78 vs.0.59,P<0.001).Of 339 with negative CT finding,the accuracy of EUS was higher than that of MRCP(90.91%vs.82.76%),but with no significant difference in AUC(0.91 vs.0.83,P=0.347).Conclusions:CT-based ASGE guideline showed superior diagnostic performance than US for predicting *** diagnostic options,EUS or MRCP,with negative CT finding showed comparable ***,the diagnostic modality should be selected based on availability,experience,cost,and contraindications.

关键词： Choledocholithiasis ASGE guideline Accuracy Endoscopic ultrasound Magnetic resonance cholangiopancreatography

Predictive factors associated with malignancy of intraductal papillary mucinous pancreatic neoplasms

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World Journal of Gastroenterology 2010年第42期16卷 5353-5358页

作者： Jin Hee Lee Kyu Taek Lee Jongwook Park Sun Youn Bae Kwang hyuck Lee Jong Kyun Lee Kee-Taek jang Jin Seok Heo Seong Ho Choi Dong Wook Choi Jong Chul Rhee Department of Medicine Samsung Medical CenterSungkyunkwan University School of MedicineSeoul 135710South Korea Department of Pathology Samsung Medical CenterSungkyunkwan University School of MedicineSeoul 135710South Korea Department of Surgery Samsung Medical CenterSungkyunkwan University School of MedicineSeoul 135710South Korea

AIM:To identify preoperative predictive factors associated with malignancy of intraductal papillary mucinous neoplasms(IPMNs) of the ***:Between April 1995 and April 2010,129 patients underwent surgical resection for IPMNs at our institute and had confirmed pathologic *** medical records were retrospectively reviewed and immunohistochemical staining for mucin(MUC) in pancreatic tissues was ***:Univariate analysis showed that the following five variables were closely associated with malignant IPMNs preoperatively:absence of extrapancreatic malignancy;symptoms;tumor size > 4 cm;main pancreaticduct(MPD) size > 7 mm;and lymph node enlargement on preoperative computed tomography(CT).Multivariate analysis revealed that the following two factors were significantly associated with malignant IPMNs preoperatively:MPD size > 7 mm [odds ratio(OR) = 2.50];and lymph node enlargement on preoperative CT(OR = 3.57).No significant differences in the expression of MUC1,MUC2 and MUC5AC were observed between benign and malignant ***:MPD size > 7 mm and preoperative lymph node enlargement on CT are useful predictive factors associated with malignancy of IPMNs.

关键词： Intraductal papillary mucinous neoplasms Malignancy Predictive factors Pancreatic neoplasms

Effects of Wind Fences on the Wind Environment around jang Bogo Antarctic Research Station

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Advances in Atmospheric Sciences 2017年第12期34卷 1404-1414页

作者： jang-Woon WANG jae-Jin KIM Wonsik CHOI Da-Som MUN Jung-Eun KANG Hataek KWON Jin-Soo KIM Kyung-Soo HAN Department of Environmental Atmospheric Sciences Pukyong National University 45Yongso-ro Korea Polar Research Institute 26 Songdomirae-ro Yeonsu-gu Department of Spatial Information Engineering Pukyong National University 45Yongso-ro

This study investigated the flow characteristics altered by jang Bogo Antarctic Research Station using computational fluid dynamics(CFD) modeling. The topography and buildings around jang Bogo Station were constructed with computeraided-design data in the CFD model domain. We simulated 16 cases with different inflow directions, and compared the flow characteristics with and without jang Bogo Station for each inflow direction. The wind data recorded by the site’s automatic weather station(AWS) were used for comparison. Wind rose analysis showed that the wind speed and direction after the construction of jang Bogo Station were quite different from those before construction. We also investigated how virtual wind fences would modify the flow patterns, changing the distance of the fence from the station as well as the porosity of the fence. For westerly inflows, when the AWS was downwind of jang Bogo Station, the decrease in wind speed was maximized(-81% for west-northwesterly). The wind speed reduction was also greater as the distance of the fence was closer to jang Bogo Station. With the same distance, the fence with medium porosity(25%–33%) maximized the wind speed *** results suggest that the location and material of the wind fence should be selected carefully, or AWS data should be interpreted cautiously, for particular prevailing wind directions.

关键词： jang Bogo Antarctic Research Station CFD model observation environment wind fence porosity

Inhibiting scar formation via wearable multilayer stacked electret patch:Self-creation of persistent and customizable DC electric field for fibrogenic activity restriction

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InfoMat 2024年第3期6卷 66-80页

作者： Sung-Won Kim Sumin Cho Donghan Lee Jiyu Hyun Sunmin jang Inwoo Seo Hyun Su Park Hee jae Hwang Hyung-Seop Han Dae Hyeok Yang Heung jae Chun Suk Ho Bhang Dongwhi Choi School of Chemical Engineering Sungkyunkwan UniversitySuwonRepublic of Korea Department of Mechanical Engineering(Integrated Engineering Program) Kyung Hee UniversityYonginGyeonggiRepublic of Korea Biomaterials Research Center Biomedical Research DivisionKorea Institute of Science and Technology(KIST)SeoulRepublic of Korea Department of Medical Life Sciences College of MedicineInstitute of Cell and Tissue EngineeringThe Catholic University of KoreaSeoulRepublic of Korea

Electrical stimulation has recently received attention as noninvasive treatment in skin wound healing with its outstanding biological property for clinical ***,the complexity of equipment for applying appropriate electrical stimulation remains an ongoing ***,we proposed a strategy for skin scar inhibition by providing electrical stimulation via a multilayer stacked electret(MS-electret),which can generate direct current(DC)electric field(EF)without any power supply *** addition,the MS-electret can easily control the intensity of EFs by simply stacking electret layers and maintain stable EF with the surface potential of 3400 V over 5 days owing to the injected charges on the electret *** confirmed inhibition of type 1 collagen andα-SMA expression of human dermal fibroblasts(hDFs)by 90%and 44%in vitro,indicating that the transition of hDFs to myofibroblasts was restricted by applying stable electrical *** further revealed a 20%significant decrease in the ratio of myofibroblasts caused by the MS-electret in *** findings present that the MS-electret is an outstanding candidate for effective skin scar inhibition with a battery-free,physiological electrical microenvironment,and noninvasive treatment that allows it to prevent external infection.

关键词： DC electric field dermal fibroblasts electret scar formation restriction self-creation of electrical stimulation

Selectivity estimation using compressed spatial information

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重庆邮电学院学报（自然科学版） 2004年第5期16卷 156-160页

作者： JEONG jae hyuck CHI Jeong hee RYU Keun ho Database Laboratory Chungbuk National UniversityCheongju KoreaDatabase Laboratory Chungbuk National UniversityCheongju KoreaDatabase Laboratory Chungbuk National UniversityCheongju Korea

Spatial selectivity estimation is one of the essential studies to get query responses rapidly and accurately with the limitation of memory space. Currently, there exist several spatial selectivity estimation techniques such as random sampling, histogram, and parametric. Especially, Cumulative Density Histogram guarantees accurate estimation for rectangle object which has multiple count problem. However, it requires large memory space because of retaining four sub histograms for spatial data. Therefore in this paper, we propose a new technique Cumulative Density Wavelet Histogram, called CDWH, which is the combination of Cumulative Density Histogram and Haar Wavelet Transform, a compressed technique. The proposed method simultaneously takes full advantage of their strong points, high accuracy provided by the former and economization of memory space supported by the latter. Consequently, our technique is able to support estimates with relatively low error and retain similar estimates even if memory space is small.

关键词：空间选择性内存空间微波转换压缩空间信息

Duodenal obstruction following acute pancreatitis caused by a large duodenal diverticular bezoar

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World Journal of Gastroenterology 2012年第38期18卷 5485-5488页

作者： Ji Hun Kim jae hyuck Chang Sung Min Nam Mi Jeong Lee Il Ho Maeng Jin Young Park Yun Sun Im Tae Ho Kim Il Young Park Sok Won Han Department of Internal Medicine College of Medicine The Catholic University of Korea Seoul 137-701 South Korea Department of Surgery College of Medicine The Catholic University of Korea Seoul 137-701 South Korea

Bezoars are concretions of indigestible materials in the gastrointestinal tract. It generally develops in patients with previous gastric surgery or patients with delayed gastric emptying. Cases of periampullary duodenal divericular bezoar are rare. Clinical manifestations by a bezoar vary from no symptom to acute abdominal syndrome depending on the location of the bezoar. Biliary obstruction or acute pancreatitis caused by a bezoar has been rarely reported. Small bowel obstruction by a bezoar is also rare, but it is a complication that requires surgery. This is a case of acute pancreatitis and subsequent duodenal obstruction caused by a large duodenal bezoar migrating from a periampullary diverticulum to the duodenal lumen, which mimicked pancreatic abscess or microperforation on abdominal computerized tomography. The patient underwent surgical removal of the bezoar and recovered completely.

关键词： Bezoar Diverticulum Pancreatitis Duodenal obstruction

Unilateral pleuroparenchymal fibroelastosis as a rare form of idiopathic interstitial pneumonia:A case report

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World Journal of Clinical Cases 2020年第18期8卷 4186-4192页

作者： jae-Ha Lee Hang-Jea jang Jin-Han Park Hyun-Kuk Kim Sunggun Lee Ji-Yeon Kim Seong-Ho Kim Department of Internal Medicine Haeundae Paik HospitalInje University College of MedicineBusan 48108South Korea Department of Pathology Haeundae Paik HospitalInje University College of MedicineBusan 48108South Korea

BACKGROUND Pleuroparenchymal fibroelastosis(PPFE)is a rare idiopathic interstitial pneumonia characterized by predominantly upper lobe involvement with pleural fibrosis and subjacent parenchymal ***,there have been increasing reports of PPFE,and PPFE might coexist with other interstitial lung diseases in the lower lobe and upper ***,cases of unilateral PPFE are *** SUMMARY A 75-year-old Korean male presented to our hospital with chronic dry cough and exertional *** patient’s symptoms started 6 mo previously and had been gradually *** the time of presentation,he felt dyspnea when walking at his own *** findings suggested PPFE,but the lesion was localized in the upper lobe of the right *** multidisciplinary discussion,a transbronchial lung biopsy in the right upper lobe revealed collapsed alveoli with parenchymal fibroelastosis,and elastic van Gieson staining demonstrated septal elastosis with intra-alveolar collagenosis,which met the histopathologic criteria of definite *** multidisciplinary discussion in an experienced interstitial lung disease center,we confirmed the diagnosis of unilateral ***,we confirmed the progression of PPFE on radiologic findings during the followup *** Clinicians should consider PPFE,even in cases with unilateral,predominantly upper lung involvement in interstitial lung disease patients through multidisciplinary discussion.

关键词： Interstitial lung disease Pleuroparenchymal fibroelastosis Progression Unilateral Multidisciplinary discussion Case report

Recurrent gastric neuroendocrine tumors treated with total gastrectomy

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World Journal of Gastroenterology 2015年第46期21卷 13195-13200页

作者： Myounghwa Jung Jung-Wook Kim jae-Young jang Young Woon Chang Sun Hee Park Yong Ho Kim Youn Wha Kim Department of Internal Medicine College of MedicineKyung Hee University Department of Surgery College of MedicineKyung Hee University Department of Pathology College of MedicineKyung Hee University

Gastric neuroendocrine tumors are rare; however,the incidence has recently increased due to the increasing use of upper endoscopy. Neuroendocrine tumors arise from the excess proliferation of enterochromaffinlike(ECL) cells. The proliferative changes of enterochromaffin cells evolve through a hyperplasiadysplasia-neoplasia sequence that is believed to underlie the pathogenesis of gastric neuroendocrine tumors. Endoscopic resection is recommended as the initial treatment if the tumor is not in an advanced stage. However,there is no definite guideline for the treatment of recurrent gastric neuroendocrine tumors following endoscopic resection. Here,we report a rare case of gastric neuroendocrine tumors in a 56-yearold male who experienced two recurrences within 11 years after endoscopic resection. The patient finally underwent a total gastrectomy. The pathological features of the resected stomach exhibited the full hyperplasia-dysplasia-neoplasia sequence of the ECL cells in a single specimen.

关键词： Neuroendocrine tumor Hyperplasia of neuroendocrine