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In situ observation of atomic movement in a ferroelectric film under an external electric field and stress

Nano Research 2018年第7期11卷 3824-3832页

作者： Hyeon Jun Lee Er-Jia Guo Taewon min seung Hyun Hwang Su Yong Lee Kathrin Dorr Jaekwang Lee Ji Young Jo School of Materials Science and Engineering Gwangju Institute of Science and Technology Gwangju 61005 Republic of Korea Quantum Condensed Matter Division Oak Ridge National Laboratory Oak Ridge TN 37830 USA Institute for Physics Martin-Luther-University Halle-Wittenberg Halle 06099 Germany Department of Physics Pusan National University Busan 46241 Republic of Korea Pohang AccelerotorLaboratory Pohang 37673 Republic of Korea

Atomic movement under application of external stimuli （i.e., electric field or mechanical stress） in oxide materials has not been observed due to a lack of experimental methods but has been well known to determine the electric polarization. Here, we investigated atomic movement arising from the ferroelectric response of BiFeO3 thin films under the effect of an electric field and stress in real time using a combination of switching spectroscop）6 time-resolved X-ray microdiffraction, and in situ stress engineering. Under an electric field applied to a BiFeO3 film, the hysteresis loop of the reflected X-ray intensity was found to result from the opposing directions of displaced atoms between the up and down polarization states. An additional shift of atoms arising from the linearly increased dielectric component of the polarization in BiFeO3 was confirmed through gradual reduction of the diffracted X-ray intensity. The electric-field- induced displacement of oxygen atoms was found to be larger than that of Fe atom for both ferroelectric switching and increase of the polarization. The effect of external stress on the BiFeO3 thin film, which was controlled by applying an electric field to the highly piezoelectric substrate, showed smaller atomic shifts than for the case of applying an electric field to the film, despite the similar tetragonality.

关键词： in situ measurement atomic displacementunder electric field time-resolved X-ray microdiffraction ferroelectrics in situ strain engineering

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Ventricular fibrillation and sudden cardiac arrest in apical hypertrophic cardiomyopathy:Two case reports

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World Journal of Clinical Cases 2021年第35期9卷 11102-11107页

作者： Yae min Park Albert Youngwoo Jang Wook-Jin Chung seung Hwan Han Christopher Semsarian In Suck Choi Department ofCardiology Gachon University Gil Medical CenterIncheon 21556South Korea Agnes Ginges Centre for Molecular Cardiology Centenary Institute The University of SydneySydney 21556Australia

BACKGROUND Apical hypertrophic cardiomyopathy(HCM)is considered to have a benign prognosis in terms of cardiovascular *** serial case report aimed to raise awareness of ventricular fibrillation(VF)and sudden cardiac death(SCD)in apical *** SUMMARY Here we describe two rare cases of apical HCM that presented with documented VF and sudden cardiac *** patients were previously not recommended for primary prevention using implantable cardioverter-defibrillator(ICD)therapy based on current ***,both received ICD therapy for the secondary prevention of *** These cases illustrate serious complications including VF and aborted sudden cardiac arrest in apical HCM patients who are initially not candidates for primary prevention using ICD implantation based on current guidelines.

关键词： Apical hypertrophic cardiomyopathy Ventricular fibrillation Implantable cardioverter-defibrillator Case report

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New Aliphatic Alcohol and Ester Constituents from Rice Hulls of Oryza sativa

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Chinese Journal of Chemistry 2007年第6期25卷 843-848页

作者： CHUNG, ILL-min ALI, Mohd CHUN, Se-Chul JIN, Cheng-Wu CHO, Dong-Ha HONG, seung-Beom AHMAD, Ateeque epartment of Applied Life Science Konkuk University Seoul 143-701 South Korea Faculty of Pharmacy Hamdard University New Delhi 110 062 India Kangwon National University School of Bioscience & Biotechnology Chunchon 200-701 South Korea

Six new aliphatic alcohol and ester compounds of n-octacos-9-enyl propionate （1）, 4-（3-formylheptyl）cyclohexyl 4-（cyclohexylcarbonyloxymethyl）cyclohexyl-carboxylate （2）, n-hentriacont-25-en-5α-ol （3）, n-hexetriacont-9,26-dien-8α,11β,23α-triol （4）, n-tetracontan-15α-ol （5） and n-tritetracontan-5α-ol （6） were isolated from the hulls of Oryza sativa. The structures were established on the basis of spectroscopic analysis.

关键词： Oryza sativa L. poaceaee rice hull compound aliphatic alcohol and ester constituents

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MEMS inductor fabrication and emerging applications in power electronics and neurotechnologies

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Microsystems & Nanoengineering 2021年第4期7卷 1-22页

作者： Hoa Thanh Le Rubaiyet I.Haque Ziwei Ouyang seung Woo Lee Shelley I.Fried Ding Zhao min Qiu Anpan Han The Rowland Institute at Harvard Harvard UniversityCambridgeMAUSA Department of Mechanical Engineering Technical University of DenmarkLyngbyDenmark Department of Electrical Engineering Technical University of DenmarkLyngbyDenmark Department of Neurosurgery Massachusetts General HospitalHarvard Medical SchoolBostonMAUSA Boston VA Healthcare System BostonMAUSA Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province School of EngineeringWestlake UniversityHangzhouChina Institute of Advanced Technology Westlake Institute for Advanced StudyHangzhouChina

MEMS inductors are used in a wide range of applications in micro-and nanotechnology,including RF MEMS,sensors,power electronics,and *** technologies set the boundary conditions for inductor design and their electrical and mechanical *** review provides a comprehensive overview of state-of-the-art MEMS technologies for inductor fabrication,presents recent advances in 3D additive fabrication technologies,and discusses the challenges and opportunities of MEMS inductors for two emerging applications,namely,integrated power electronics and *** the four top-down MEMS fabrication approaches,3D surface micromachining and through-substrate-via(TSV)fabrication technology have been intensively studied to fabricate 3D inductors such as solenoid and toroid in-substrate TSV *** 3D inductors are preferred for their high-quality factor,high power density,and low parasitic capacitance,in-substrate TSV inductors offer an additional unique advantage for 3D system integration and efficient thermal *** features make in-substrate TSV inductors promising to achieve the ultimate goal of monolithically integrated power *** another perspective,3D bottom-up additive techniques such as ice lithography have great potential for fabricating inductors with geometries and specifications that are very challenging to achieve with established MEMS ***,we discuss inspiring and emerging research opportunities for MEMS inductors.

关键词： inductor power lithography

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Development of dilated cardiomyopathy with a long latent period followed by viral fulminant myocarditis:A case report

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World Journal of Clinical Cases 2022年第36期10卷 13451-13457页

作者： seung Do Lee Hyo Jin Lee Hye Ree Kim min Gyu Kang Kyehwan Kim Jeong Rang Park Division of Cardiology Department of Internal MedicineGyeongsang National University School of Medicine and Gyeongsang National University HospitalJinju 52727South Korea

BACKGROUND The clinical course of acute myocarditis ranges from the occurrence of a few symptoms to the development of fatal fulminant ***,fulminant myocarditis causes clinical deterioration very rapidly and *** long-term prognosis of myocarditis is varied,and it fully recovers without leaving any special ***,even after recovery,heart failure may occur and eventually progress to dilated cardiomyopathy(DCM),which causes serious left ventricular *** the case of follow-up observation,no clear guidelines have been *** SUMMARY We report the case of a 21-year-old woman who presented with *** became hemodynamically unstable and showed sustained fatal arrhythmias with decreased heart *** was clinically diagnosed with fulminant myocarditis based on her echocardiogram and cardiac magnetic resonance *** 2 d,she was readmitted to the emergency department under cardiopulmonary resuscitation and received mechanical ventilation and extracorporeal membrane *** implantable cardioverter defibrillator was inserted for secondary *** recovered and was *** to being hospitalized for sudden cardiac function decline and arrhythmia,she had been well for 7 years without any *** was finally diagnosed with dilated *** DCM may develop unexpectedly in patients who have been cured of acute fulminant myocarditis and have been stable with a long period of ***,they should be carefully and regularly observed clinically throughout long-term follow-up.

关键词： Myocarditis Fulminant Dilated cardiomyopathy Outcome Remission Case report

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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

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Arctic warming and its influence on East Asian winter cold events:a brief recap

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Advances in Polar Science 2018年第1期29卷 3-12页

作者： Seong-Joong KIM baek-min KIM Korea Polar Research Institute 26 Songdomirae-roYeonsu-guIncheon#406-840Republic of Korea

The rate of warming of Arctic surface temperature is about 2–3 times faster than the global mean surface warming. Increases of ice albedo feedback and water vapor as well as moisture intrusion from outside the Arctic all have major roles in this phenomenon. In contrast to this rapid Arctic warming, in recent decades, stronger cold air outbreaks have occurred more frequently during winter in East Asia than were recorded in the 1990s, resulting in severe socioeconomic impacts. A number of related studies have claimed the increased frequency of these stronger cold air outbreaks is linked to the amplified warming in the Arctic through complicated mechanisms. As there are time lags between the observed Arctic warming and East Asian cold weather response at various scales, understanding the entire chain of processes from the Arctic to East Asia has importance for forecasting winter weather in East Asia. There are two pathways linking Arctic warming with East Asian cold weather events. One is the synoptic-scale pathway in the lower troposphere via strengthening of the Siberian High initiated by Ural blocking. The other is the planetary-scale path through the stratosphere via activation of planetary waves and downward propagation, which weakens the polar vortex. This study briefly reviews the current understanding of the linkage mechanisms between Arctic warming and East Asian winter cold weather.

关键词： Arctic warming East Asia cold surge linkage process synoptic response planetary response

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Pediatric appendicitis with appendicolith often presents with prolonged abdominal pain and a high risk of perforation

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World Journal of Pediatrics 2018年第2期14卷 184-190页

作者： Hee Mang Yoon Jung Heon Kim Jong seung Lee Jeong-min Ryu Dae Yeon Kim Jeong-Yong Lee Department of Radiology and Research Institute of Radiology Asan Medical CenterUniversity of Ulsan College of MedicineSeoul 05505South Korea Department of Emergency Medicine Asan Medical CenterUniversity of Ulsan College of MedicineSeoul 05505South Korea Department of Pediatric Surgery Asan Medical CenterUniversity of Ulsan College of MedicineSeoul 05505South Korea Department of Pediatrics Asan Medical CenterUniversity of Ulsan College of Medicine88Olympic-ro 43-gilSongpa-guSeoul 05505South Korea

Background Appendicolith can cause appendiceal obstruction and acute *** high prevalence may be related to the high perforation rate in pediatric *** study assessed the characteristics of appendicolith and its clinical significance in pediatric *** A retrospective study was performed among children and adolescents younger than 17 years who were preopera-tively diagnosed with appendicitis in the pediatric emergency department(ED).A total of 269 patients with a mean age of 9.98±3.37 years were *** features and contrast-enhanced computed tomography findings were *** Among the 269 patients,147(54.6%)had appendicoliths,with a mean maximal diameter of 5.21±2.34 ***-pared to the no appendicolith group,the appendicolith group demonstrated more prolonged abdominal pain(≥48 hours)before the ED visit(23.1%vs.11.5%;P=0.013),clinical features of severe appendicitis(presence of fever,vomiting,posi-tive urine ketone,and increased C-reactive protein),and higher rate of perforation(43.5%vs.9.8%;Pminal pain and severe clinical conditions with a high risk of perforation.

关键词： Appendicitis Appendicolith Computed tomography Pediatrics Risk factors

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Erratum to： A highly sensitive chemical gas detecting transistor based on highly crystalline CVD-grown MoSe2 films

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Nano Research 2017年第8期10卷 I0002-I0004,F0003页

作者： Jongyeol baek Demin Yin Na Liu Inturu Omkaram Chulseung Jung Healin Im Seongin Hong seung min Kim Young Ki Hong Jaehyun Hur Youngki Yoon Sunkook Kim School of Advanced Materials Science & Engineering Sungkyunkwan University Suwon 16419 Republic of Korea Department of Electrical and Computer Engineering & Waterloo Institute for Nanotechnology (WIN) University of Waterloo Waterloo ON N2L 3GI Canada Institute of Advanced Composite Materials Korea Institute of Science and Technology (KIST) Jeonbuk 565-905 Republic of Korea Department of Chemical and Biological Engineering Gachon University Seongnam-si Gyeonggi 13120 Republic of Korea

AIMS ＆ SCOPENano Research is a peer-reviewed, international and interdisciplinary journal that focuses on all aspects of nanoscience and nanotechnology. Submissions are solicited in all topical areas, ranging from ba...

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Comparative Study of Visual and Instrumental Analyses of Shade Selection

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Journal of Wuhan University of Technology(Materials Science) 2010年第1期25卷 62-67页

作者： Jee-Ha Choi Ju-Mi Park seung-Geun Ahn Kwang-Yeob Song min-Ho Lee Jae-Youn Jung Xinyu Wang Department of Prosthodontics and Institute of Oral Bioscience School of Dentistry Chonbuk National University Jeonju Republic of Korea Department of Dental Biomaterials and Institute of Oral Bioscience School of Dentistry Chonbuk National University Jeonju Republic of Korea Division of Mechanical & Aerospace System Engineering and RCIT Chonbuk National University Jeonju Republic of Korea Biomedical Materials and Engineering Research Center Wuhan University of Technology Wuhan 430070 China

The difference between visual and instrumental analyses of a shade selection on natural teeth was investigated. With visual analysis, five prosthodontist examined the middle third of the unrestored maxillary right central incisor of a patient using VITAPEN classical and Vita Toothguide 3D-MASTER tooth shade guide. In instrumental analysis, one prosthodontist examined the same teeth using a spectrophotometer （ShadepilotTM, Degudent, Hanau-Wolfgang, Germany, software 2.40）. Overall, instrumental analysis is more accurate and reproducible than a visual assessment. However, the difference is clinically acceptable.

关键词： shade selection visual analysis instrumental analysis spectrophotometer

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