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Fabrication of high-strength duplex nanoporous Cu by dealloying a dual-phase Mg-Cu precursor alloy

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Journal of Magnesium and Alloys 2020年第3期8卷 910-916页

作者： si-young lee Soo-Min Baek Eun-Ji Gwak Na-Ri Kang Ju-young Kim Su-Hyeon Kim Jung Gu lee Sung Soo Park School of Materials Science and Engineering Ulsan National Institute of Science and TechnologyUlsan 44919Republic of Korea Korea Institute of Materials Science Changwon 51508Republic of Korea School of Materials Science and Engineering University of UlsanUlsan 44610Republic of Korea

Duplex nanoporous Cu was successfully fabricated by dealloying a dual-phase Mg-Cu precursor alloy consisting of intermetallic Mg2Cu and *** duplex nanoporous Cu with embedded nanoporous struts exhibited highly enhanced strength compared to the typical monolithic nanoporous Cu under both compressive and flexural test conditions at room temperature;the duplex np-Cu sample exhibited a 12 times higher compressive strength and a 40 times greater flexural strength than the monolithic np-Cu *** responsible for the strength enhancement in the duplex nanoporous Cu are discussed.

关键词： Mg-Cu alloy Nanoporous Cu Dealloying Duplex structure Strength

Hot electron generation on metal catalysts under surface reaction:Principles, devices, and application

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Chinese Chemical Letters 2018年第6期29卷 727-733页

作者： Ievgen I.Nedrygailov Hyosun lee si Woo lee Jeong young Park Center for Nanomaterials and Chemical Reactions Institute for Basic Science Graduate School of EEWS Korea Advanced Institute of Science and Technology(KAIST)

Understanding the fundamental mechanisms for charge transfer in supported catalysts is of great importance for heterogeneous catalysis. Several experimental and theoretical results suggest that charge flow through metal-support interfaces leads to the catalytic enhancement that is often observed in mixed catalysts. Therefore, it is crucial to directly probe this charge flow in metal-support catalysts during catalytic reactions. In this review, we consider the main aspects of research studying the processes that create and allow interfacial transfer of highly excited（hot） charge carriers in supported catalysts, and discuss the effect of this charge transfer on catalytic activity. We show a close connection between the phenomena of hot electron creation and chemical energy dissipation that accompanies catalytic reactions at both the gas/solid and liquid/solid interfaces. The intensity of hot electron flow is well correlated with the turnover rates of corresponding reactions, which opens up the possibility for developing new operando methodologies for studying chemical processes on catalytic surfaces.

关键词： Hot electron Energy dissipation Heterogeneous catalysis Metal-support interactions Nanodiode

Tamsulosin-induced life-threatening hypotension in a patient with spinal cord injury:A case report

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World Journal of Clinical Cases 2022年第25期10卷 9142-9147页

作者： Jae young lee Ho Seok lee si-Bog Park Kyu Hoon lee Rehabilitation Medicine Hanyang University HospitalSeoul 04763South Korea

BACKGROUND Tamsulosin,a selectiveα1-adrenergic receptor antagonist,is commonly used for treating neurogenic bladder in patients with spinal cord injury(SCI).No severe adverse events have been described with such tamsulosin *** our knowledge,we report the first case of severe life-threatening hypotension as an adverse effect of tamsulosin in a person with ***,we report this case to inform that this severe adverse effect of tamsulosin can occur when treating patients with *** SUMMARY A 59-year-old woman was diagnosed with cervical spinal cord myelopathy and was classified as American Spinal Injury Association Impairment Scale D,neurological level of injury *** she suffered from voiding difficulty due to neurogenic bladder,we prescribed *** vital signs remained stable,but occasional hypotensive symptoms followed *** reduced the dose of tamsulosin,but after administering tamsulosin for 9 d,she experienced lifethreatening hypotension with no evidence of hypovolemic shock,neurogenic shock,cardiogenic shock,or septic shock.A hypotensive condition induced by tamsulosin was the suspected cause,and her symptoms could be associated with adverse effects of *** symptoms resolved after stopping tamsulosin,and no other reason was found,we concluded that tamsulosin was the cause of her *** Caution for severe hypotension is needed when administering tamsulosin for neurogenic bladder in a patient with SCI.

关键词： Tamsulosin Neurogenic bladder Spinal cord injury Hypotension Vasovagal symptoms Case report

Defect-Detection Model for Underground Parking Lots Using Image Object-Detection Method

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Computers, Materials & Continua 2021年第3期66卷 2493-2507页

作者： Hyun Kyu Shin si Woon lee Goo Pyo Hong lee Sael Sang Hyo lee Ha young Kim Architectural Engineering Hanyang UniversityERICAAnsan15588Korea Department of Artificial Intelligence Ajou UniversitySuwon16499Korea Division of Architecture and Civil Engineering Kangwon National UniversitySamcheok25913Korea Division of Smart Convergence Engineering Hanyang UniversityERICAAnsan15588Korea Graduate School of Information Yonsei UniversitySeoul03722Korea

The demand for defect diagnoses is gradually gaining ground owing to the growing necessity to implement safe inspection methods to ensure the durability and quality of ***,conventional manpower-based inspection methods not only incur considerable cost and time,but also cause frequent disputes regarding defects owing to poor ***,the demand for an effective and efficient defect-diagnosis model for concrete structures is imminent,as the reduction in maintenance costs is significant from a long-term ***,this paper proposes a deep learning-based image objectidentification method to detect the defects of paint peeling,leakage peeling,and leakage traces that mostly occur in underground parking lots made of concrete *** deep learning-based object-detection method can replace conventional visual inspection methods.A faster region-based convolutional neural network(R-CNN)model was used with a training dataset of 6,281 images that utilized a region proposal network to objectively localize the regions of interest and detect the surface *** defects were classified according to their type,and the learning of each exclusive model was ensured through test sets obtained from real underground parking *** a result,average precision scores of 37.76%,36.42%,and 61.29%were obtained for paint peeling,leakage peeling,and leakage trace defects,***,this study verified the performance of the faster RCNN-based defect-detection algorithm along with its applicability to underground parking lots.

关键词： Faster R-CNN deep learning defect detection concrete structures

Epirubicin,Cisplatin,5-FU combination chemotherapy in sorafenib-refractory metastatic hepatocellular carcinoma

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World Journal of Gastroenterology 2014年第1期20卷 235-241页

作者： Ji Eun lee si Hyun Bae Jong young Choi Seung Kew Yoon young Kyoung You Myung Ah lee Division of Medical Oncology Hepato-Biliary-Pancreatic Cancer CenterCancer Research Institute Seoul St. Mary’s HospitalCollege of MedicineThe Catholic University of KoreaSeoul 137-040South Korea Department of Internal Medicine Hepato-Biliary-Pancreatic Cancer CenterCancer Research InstituteSeoul St. Mary’s HospitalCollege of MedicineThe Catholic University of KoreaSeoul 137-040South Korea Division of Hepatology Hepato-Biliary-Pancreatic Cancer CenterCancer Research Institute Seoul St. Mary’s HospitalCollege of MedicineThe Catholic University of KoreaSeoul 137-040South Korea Department of Surgery Hepato-Biliary-Pancreatic Cancer CenterCancer Research InstituteSeoul St. Mary’s HospitalCollege of MedicineThe Catholic University of KoreaSeoul 137-040South Korea

AIM: To evaluate the clinical efficacy and safety of epirubicin, cisplatin, and 5-FU combination chemotherapy for the sorafenib-refractory metastatic hepatocellular carcinoma (HCC).

关键词： Hepatocellular carcinoma Sorafenib Epirubicin Cisplatin 5-FU

Statistics of oxidation resistance of Ni-(0-15)Co-(8-15)Cr-(0-5)Mo-(0-10)W-(3-8)Al-(0-5)Ti-(0-10)Ta-0.1C-0.01B superalloys at 1000℃ by compositional variations

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Rare Metals 2020年第8期39卷 918-927页

作者： si-Jun Park Kyu-Hyuk lee Seong-Moon Seo Hi-Won Jeong young-Soo Yoo HeeJin Jang Multi-Material Research Center Gwangju-Jeonnam DivisionKorea Automotive Technology InstituteGwangju 62207Republic of Korea Department of Advanced Materials Engineering Chosun UniversityGwangju 61452Republic of Korea High Temperature Materials Group Korea Institute of Materials ScienceChangwon 51508Republic of Korea Department of Materials Science and Engineering Chosun UniversityGwangju 61452Republic of Korea

The effects of alloying elements(Co,Cr,Mo,W,Al,Ti,and Ta)on the oxidation resistance of Ni-(0-15)Co-(8-15)Cr-(0-5)Mo-(0-10)W-(3-8)Al-(0-5)Ti-(0-10)Ta-0.1 C-0.01 B alloys were *** sample compositions were designed by the Box-Behnken method of design of experiments(DOE).The alloying elements show complicated effects on the mass gain due to oxidation,depending on the alloy *** reduces the mass gain *** other elements except Al do not appear to exert a strong effect on the oxidation rate on average,but their influences are shown clearly in the alloys with a low Al ***,W,and Ta reduce the oxidation rate,while Cr,Mo,and Ti promote *** is the most effective element in reducing the oxidation rate of the alloy with a low Al *** is confirmed that a continuous Al2O3 layer is essentially required for high oxidation *** oxide scale of easily oxidized alloys has various oxides such as NiCr2O4,NiAl2O4,NiO,Cr2O3,CrTaO4,and TiO2.

关键词： High temperature oxidation Alloy composition Ni-based superalloy Oxidation resistance Design of experiments

Clinical outcomes of endoscopic resection of superficial nonampullary duodenal epithelial tumors: A 10-year retrospective, single-center study

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World Journal of Gastrointestinal Surgery 2022年第4期14卷 329-340页

作者： Joon Hyun Cho Ki young Lim Eun Jung lee si Hyung lee Division of Gastroenterology and Hepatology Department of Internal MedicineYeungnam University College of MedicineDaegu 42415South Korea

BACKGROUND Although premalignant duodenal lesions such as adenomas are uncommon,the incidences of these lesions have increased in recent times,and thus,the demand for minimally invasive treatments such as endoscopic resection(ER)has also ***,ER in the duodenum is more challenging than ER in other locations of the gastrointestinal *** To evaluate the safety and efficacy of ER for superficial nonampullary duodenal epithelial tumors(SNADETs)METHODS We performed a retrospective observational study on 56 consecutive patients(58 lesions)diagnosed with SNADETs that underwent ER from January 2011 to December 2020 at Yeungnam University *** demographics,lesion characteristics,and procedural and technical data were collected,and clinical outcomes,including procedure-related complications,completeness of resection,and recurrence were *** Median patient age was 57 years[range,26–77,30(53.6%)men].Endoscopic mucosal resection(EMR)was performed on 57 lesions(98.3%)and snare polypectomy on one(1.7%).Lesions consisted of 52 adenomas with low-grade dysplasia(89.7%),3 adenomas with high-grade dysplasia(5.2%),and 3 intramucosal adenocarcinomas(5.2%).There were 16 cases of intraprocedural bleeding(27.6%)and 1 case of delayed bleeding(1.7%),and all these 17 cases were successfully managed *** perforation or procedure-related death *** lesion size was associated with an increased risk of EMR-related bleeding(P=0.033).During a median follow-up period of 23 mo(range 6–100 mo),no local recurrence occurred,despite the fact one-third of the patients(19 lesions,32.8%)underwent piecemeal resection and 3 patients(3 lesions,5.2%)that underwent en bloc resection had a pathologically determined positive lateral *** patient died from a primary duodenal *** The majority of SNADETs can be safely and curatively resected by EMR,and thus,based on consideration of the high incidence of fatal complications attribut

关键词： Duodenum Adenoma Endoscopic mucosal resection Endoscopic resection Superficial nonampullary duodenal epithelial tumor

Black esophagus with concomitant candidiasis developed after diabetic ketoacidosis

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World Journal of Gastroenterology 2007年第42期13卷 5662-5663页

作者： Yong Hwan Kim si young Choi Department of Thoracic and Cardiovascular Surgery Uijeongbu St. Mary's Hospital The Catholic University of Korea College of Medicine Seoul 480-821 Korea Department of Thoracic and Cardiovascular Surgery Uijeongbu St. Mary’s Hospital The Catholic University of Korea College of Medicine Seoul 480-821 Korea

Black esophagus is a very rare disease and its pathogenesis has been *** esophagus developed concomitantly with candidiasis after diabetic ketoacidosis has not been reported *** report a case who developed esophageal stricture after the treatment of black esophagus and thus balloon dilatation was performed several times but failed,hence,surgical treatment was performed.

关键词： Esophagus Candidiasis Diabetic ketoacidosis Surgery

Evaluation the Properties of Titanium Matrix Composites by Melting Route Synthesis

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Journal of Materials Science & Technology 2008年第1期24卷 105-109页

作者： Bong-Jae Choi si-young Sung Myoung-Gyun Kim young-Jig Kim Department of Advanced Materials Engineering Sungkyunkwan University SuwonKorea Department of Advanced Materials Engineering Sungkyunkwan University SuwonKorea Materials & Processing Engineering CenterR&D DivisionKorea Automotive Technology InstituteChonanChungnamKorea Research Institute of Industrial Science and Technology Pohang Korea

The main purpose of this study is an in-situ synthesis of （TiB＋TiC） hybrid titanium matrix composites （TMCs） by vacuum induction melting method and to verify its mechanical *** melting route was adopted to synthesize the commercial pure titanium （cp Ti） and granular boron carbide （B-4C）.The reinforcements,the fraction of 10 ***,were formed by adding 1.88 wt pct B-4C to cp *** in-situ synthesis of TMCs,electron probe micro-analysis elemental mapping was carried out to confirm the distribution and shape of *** cone-on-disk type sliding wear test was also done for the identification of *** is concluded that （TiB＋TiC） hybrid TMCs can be in-situ synthesized and has better wear properties than H13.

关键词： Titanium matrix composites H13 In-situ Wear