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Depolarization mitigated in ferroelectric Hf_(0.5)Zr_(0.5)O_(2)ultrathin films(<5 nm)on Si substrate by interface engineering

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Journal of Advanced Ceramics 2024年第3期13卷 282-292页

作者： Se hyun Kim Younghwan lee dong hyun lee Geun Hyeong Park hyun Woo Jeong Kun Yang Yong Hyeon Cho Young Yong Kim Min Hyuk Park Department of Materials Science and Engineering College of EngineeringSeoul National UniversitySeoul 08826Republic of Korea Research Institute of Advanced Materials College of EngineeringSeoul National UniversitySeoul 08826Republic of Korea Inter-university Semiconductor Research Center College of EngineeringSeoul National UniversitySeoul 08826Republic of Korea Pohang Accelerator Laboratory Pohang University of Science&TechnologyPohang 790784Republic of Korea

(Hf,Zr)O_(2)offers considerable potential for next-generation semiconductor devices owing to its nonvolatile spontaneous polarization at the ***,scaling this material to sub-5 nm thickness poses several challenges,including the formation of an interfacial layer and high trap *** particular,a low-k SiO_(2)interfacial layer is naturally formed when(Hf,Zr)O_(2)films are directly grown on a Si substrate,leading to high depolarization fields and rapid reduction of the remanent *** address these issues,we conducted a study to significantly improve ferroelectricity and switching endurance of(Hf,Zr)O_(2)films with sub-5 nm thicknesses by inserting a TiO_(2)interfacial *** deposition of a Ti film prior to Hf_(0.5)Zr_(0.5)O_(2)film deposition resulted in a high-k TiO_(2)interfacial layer and prevented the direct contact of Hf_(0.5)Zr_(0.5)O_(2)with *** findings show that the high-k TiO_(2)interfacial layer can reduce the SiO_(2)/Si interface trap density and the depolarization field,resulting in a switchable polarization of 60.2μC/cm^(2)for a 5 nm thick Hf_(0.5)Zr_(0.5)O_(2)***,we propose that inserting a high-k TiO_(2)interfacial layer between the Hf_(0.5)Zr_(0.5)O_(2)film and the Si substrate may offer a promising solution to enhancing the ferroelectricity and reliability of(Hf,Zr)O_(2)grown on the Si substrate and can pave the way for next-generation semiconductor devices with improved performance.

关键词： ferroelectric charge trapping hafnia depolarization

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Optical Properties of Laterally Aligned Si Nanowires for Transparent Electronics Applications

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Nano Research 2011年第9期4卷 817-823页

作者： dong hyun lee Jaeseok Yi Won Woo lee Ungyu Paik John A. Rogers Won II Park Division of Materials Science and Engineering Hanyang University Seoul 133-791 Korea Department of Energy Engineering Hanyang University Seoul 133-791 Korea Department of Materials Science and Engineering Department of Chemistry Department of Mechanical Science and Engineering Beckman Institute and Frederick Seitz Materials Research Laboratory University of Illinois at Urbana-Champaign Urbana Illinois 61801 USA

We have investigated the optical properties of laterally aligned Si nanowire （SiNW） arrays in order to explore their potential applicability in transparent electronics. The SiNW array exhibited good optical transparency in the visible spectral range with a transmittance of -90% for a NW density of -20-25 per 10 μm. In addition, polarization-dependent measurements revealed a variation in transmittance in the range of 80%-95% depending on the angle between the polarization of incident light and the NW axis. Using the SiNWs, we demonstrated that transparent transistors exhibit good optical transparency （greater than 80%） and showed typical p-type SiNW transistor characteristics.

关键词： Si nanowire optical properties transparent thin film transistor finite-difference time-domain (FDTD) modeling

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Mobile lens- induced angle closure glaucoma and rubeosis iridis in Sturge Weber syndrome

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International Journal of Ophthalmology(English edition) 2015年第5期8卷 1080-1082页

作者： dong hyun lee Jonghoon Shin Jae hyun Seo Ik Soo Byon Jae Ho Jung Ji Eun lee Department of Ophthalmology Pusan National University Yangsan Hospital Department of Ophthalmology Pusan National University Hospital Research Institute for Convergence of Biomedical Science and Technology Yangsan Pusan National University Hospital Medical Institute School of MedicinePusan National University

Dear Sir,I am dong hyun lee from the Department of Ophthalmology at the Pusan National University Yangsan Hospital,Yangsan,***,I present the development of a lens-induced angle closed glaucoma and iris neovascularization in the patient with Sturge Weber syndrome(SWS)with open angle *** consent was obtained from a patient before each procedure The study was conducted in accordance with the tenets of the Declaration of Helsinki.

关键词： induced angle closure glaucoma and rubeosis iridis in Sturge Weber syndrome SWS open IOP Mobile lens Figure

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Effect of angiotensin Ⅱ type 1 receptor blocker and angiotensin converting enzyme inhibitor on the intraocular growth factors and their receptors in streptozotocin-induced diabetic rats

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International Journal of Ophthalmology(English edition) 2017年第6期10卷 896-901页

作者： Ik Soo Byon dong hyun lee Eun Sook Jun Min Kyu Shin Sung Who Park Ji Eun lee Department of Ophthalmology Research Institute for Convergence of Biomedical Science and Technology Pusan National University Yangsan Hospital Yangsan 50612 Korea College of Medicine Pusan National University Yangsan 50612 Korea Department of Ophthalmology Biomedical Research Institute Pusan National University Hospital Busan 49241 Korea Balgeunsesang Eye Clinic Busan 47286 Korea

AIM： To investigate the effect of angiotensin II type 1 receptor blocker （ARB） and angiotensin converting enzyme inhibitor （ACEI） on intraocular growth factors and their receptors in streptozotocin-induced diabetic rats. METHODS： Forty Sprague-Dawley rats were divided into 4 groups： control, diabetes mellitus （DM）, candesartan- treated DM, and enalapril-treated DM （each group, n---10）. After the induction of DM by streptozotocin, candesartan [ARB, 5 mg/（kg · d）] and enalapril [ACEI, 10 mg/（kg · d）] were administered to rats orally for 4Wko Vascular endothelial growth factor （VEGF） and angiotensin II （Ang II） concentrations in the vitreous were measured using enzyme-linked immunosorbent assays, and VEGF receptor 2 and angiotensin II type 1 receptor （ATIR） levels were assessed at week 4 by Western blotting. RESULTS： Vitreous Ang II levels were significantly higher in the DM group and candesartan-treated DM group than in the control （P=0.04 and 0.005, respectively）. Vitreous ATIR increased significantly in DM compared to the other three groups （P〈0.007）. Candesartan-treated DM rats showed higher vitreal ATIR concentration than the enalapril-treated DM group and control （P〈0.001 and P=0.005, respectively）. No difference in vitreous Ang II and ATIR concentration was found between the enalapril- treated DM group and control. VEGF and its receptor were below the minimum detection limit in all 4 groups. CONCLUSION： Increased Ang II and ATIR in the hyperglycemic state indicate activated the intraocular renin-angiotensin system, which is inhibited more effectively by systemic ACEI than systemic ARB.

关键词： angiotensin converting enzyme inhibitor angiotensin II type 1 receptor blocker diabetic rat intraocularrenin-angiotensin system

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Hydrodynamics of air-kerosene bubble column under elevated pressure in homogeneous flow regime

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Chinese Journal of Chemical Engineering 2021年第5期34卷 190-202页

作者： Bay Van Tran Son Ich Ngo Young-Il Lim Keon Bae dong hyun lee Kang-Seok Go Nam-Sun Nho Center of Sustainable Process Engineering(CoSPE) Department of Chemical EngineeringHankyong National UniversityGyeonggi-doAnseong-siJungang-ro 32717579Republicof Korea School of Chemical Engineering Sungkyunkwan University2066 Seobu-roJanganSuwon 16419Republic of Korea Center for Convergent Chemical Process(CCP) 141 Gajeong-roYuseong-guDaejeon 34114Republic of Korea

A multiphase computational fluid dynamics(CFD)model coupled with the population balance equation(PBE)was developed in a homogeneous air-kerosene bubble column under elevated pressure(P).The specific pressure drop(ΔP/L),gas holdup(α_(G)),and Sauter mean diameter(d_(32))were experimentally measured in the bubble column with 1.8 m height and 0.1 m inner diameter,which was operated at a superficial gas velocity of 12.3 mm·s^(-1),and P=1-35 bar(1 bar=10^(5) Pa).A modified drag coefficient model was proposed to consider the effect of bubble swarm and pressure on hydrodynamics of the bubble *** Luo breakage model was modified to account for liquid density,viscosity,surface tension and gas ***ΔP/L,α_(G),and d_(32) obtained from the CFD model were compared with experimental data,and the gas density-dependent parameters of the CFD model were *** increasing P from 1 to 35 bar,theα_(G) varied from 5.4%to 7.2% and the d32 decreased from 2.3 to 1.5 *** CFD-PBE model is applicable to predict hydrodynamics of pressurized bubble columns for gas-organic liquid in the homogeneous regime.

关键词： Bubble column Air-kerosene High pressure Homogenous regime Computational fluid dynamics (CFD) Population balance equation (PBE)

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Neuromorphic devices based on fluorite-structured ferroelectrics

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InfoMat 2022年第12期4卷 1-32页

作者： dong hyun lee Geun Hyeong Park Se hyun Kim Ju Yong Park Kun Yang Stefan Slesazeck Thomas Mikolajick Min Hyuk Park Department of Materials Science and Engineering&Inter-University Semiconductor Research Center College of EngineeringSeoul National UniversitySeoulRepublic of Korea Research Institute of Advanced Materials Seoul National UniversitySeoulRepublic of Korea NaMLab gGmbH DresdenGermany Institute of Engineering Research Seoul National UniversitySeoulRepublic of Korea

A continuous exponential rise has been observed in the storage and processing of the data that may not curtail in the foreseeable *** required data processing speed and power consumption are restricted by the buses between the logic and memory devices that are characteristic of the von Neumann computing ***-mimicking neuromorphic computing has garnered considerable academic and industrial interest to resolve these ***,devices based on emerging nonvolatile memories capable of mimicking the behaviors of synapses and neurons,which are the main elements in biological computing systems(brains),are attracting significant interest from the device *** the discovery of ferroelectricity in fluorite-structured oxides,such as HfO2 and ZrO2,which are compatible with the state-of-the-art complementary-metal-oxide-semiconductor processes,ferroelectric devices have rapidly evolved as the main direction of these research and development *** science related to fluorite-structured ferroelectrics has been intensively studied over the last *** present,the focus is gradually moving to practical applications,including neuromorphic computing and advanced classical processing or memory units in the conventional von Neumann ***,despite its rapid development,the wealth of recent progress in neuromorphic computing devices based on fluorite-structured ferroelectrics has not been reviewed and *** progress report comprehensively reviews and systemizes the recent progress in artificial synaptic and spiking neuron devices for neuromorphic computing based on fluorite-structured ferroelectrics.

关键词： ferroelectrics hafnia neuromorphic computing semiconductor devices

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Acute idiopathic pancreatitis in pregnancy:A case study

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World Journal of Gastroenterology 2014年第43期20卷 16364-16367页

作者： Ji Yeon Kim Sung Hoon Jung hyung Wook Choi dong Jin Song Cheol Yoon Jeong dong hyun lee Il Soon Whang Department of Internal Medicine Cheil General Hospital and Women’s Healthcare CenterKwandong University College of MedicineSeoul KS013South Korea

Acute pancreatitis during pregnancy is a rare event,and can be associated with high maternal mortality and fetal *** disease is thought to be the most common causative factor of acute pancreatitis,but,in many cases,the cause remains *** report a case of a 36-year-old woman at 35 wk of gestation,who presented with severe pain confined to the upper abdomen and radiating to the *** patient was diagnosed with acute idiopathic pancreatitis,which was managed conservatively;she recovered within several days and then delivered a healthy *** it is important to consider acute pancreatitis when a pregnant woman presents with upper abdominal pain,nausea and vomiting in order to improve fetal and maternal outcomes for patients with acute pancreatitis.

关键词： Acute pancreatitis Pregnancy Pancreatitis in pregnancy Idiopathic Idiopathic acute pancreatitis

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T/myeloid mixed-phenotype acute leukemia treated with venetoclax and decitabine:A case report

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World Journal of Clinical Cases 2023年第26期11卷 6200-6205页

作者： Sungwoo Park Eun Jeong Jeong Jung Hun Kang Gyeong-Won lee Se-Il Go dong-hyun lee Eun-Ha Koh Division of Hematology and Oncology Department of Internal MedicineGyeongsang National University HospitalGyeongsang National University School of MedicineGyeongsang National UniversityJinju 52727South Korea Department of Internal Medicine Institute of Health SciencesGyeongsang National University Changwon HospitalGyeongsang National University School of MedicineChangwon 52828South Korea Department of Laboratory Medicine Gyeongsang National University HospitalGyeongsang National University School of MedicineGyeongsang National UniversityJinju 52828South Korea

BACKGROUND Mixed-phenotype acute leukemia(MPAL)is characterized by acute undifferentiated leukemia with blasts co-expressing myeloid and lymphoid ***,consensus regarding the ideal management strategy for MPAL is yet to be established,owing to its *** SUMMARY A 55-year-old male was diagnosed with T/myeloid ***,prednisolone,daunorubicin,and L-asparaginase were administered as induction *** shock occurred 10 days after induction,and bone marrow examination following recovery from sepsis revealed refractory *** and decitabine were administered as chemotherapy-free induction therapy to reduce the infection *** were no serious infections,including febrile neutropenia,at the end of the *** receiving two additional cycles of venetoclax/decitabine,the patient underwent haploidentical peripheral blood stem-cell transplantation and achieved complete response(CR)to *** CR was maintained in a patient with MPAL who underwent haploidentical peripheral blood stem-cell transplantation after additional venetoclax/decitabine cycles.

关键词： Mixed-phenotype acute leukemia Venetoclax Decitabine Case report

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Aligned Ion Conduction Pathway of Polyrotaxane‑Based Electrolyte with Dispersed Hydrophobic Chains for Solid‑State Lithium–Oxygen Batteries

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Nano-Micro Letters 2025年第2期17卷 169-186页

作者： Bitgaram Kim Myeong‑Chang Sung Gwang‑Hee lee Byoungjoon Hwang Sojung Seo Ji‑Hun Seo dong‑Wan Kim Department of Materials Science and Engineering Korea University145 Anam‑RoSeongbuk‑GuSeoul 02841Republic of Korea School of Civil Environmental and Architectural EngineeringKorea University145 Anam‑RoSeongbuk‑GuSeoul 02841Republic of Korea Materials Science and Chemical Engineering Center Institute for Advanced Engineering(IAE)Yongin 17180Republic of Korea

A critical challenge hindering the practical application of lithium–oxygen batteries(LOBs)is the inevitable problems associated with liquid electrolytes,such as evaporation and safety *** study addresses these problems by proposing a modified polyrotaxane(mPR)-based solid polymer electrolyte(SPE)design that simultaneously mitigates solvent-related problems and improves ***-SPE exhibits high ion conductivity(2.8×10^(−3)S cm^(−1)at 25℃)through aligned ion conduction pathways and provides electrode protection ability through hydrophobic chain *** this mPR-SPE into solid-state LOBs resulted in stable potentials over 300 *** situ Raman spectroscopy reveals the presence of an LiO_(2)intermediate alongside Li_(2)O_(2)during oxygen *** situ X-ray diffraction confirm the ability of the SPE to hinder the permeation of oxygen and moisture,as demonstrated by the air permeability *** present study suggests that maintaining a low residual solvent while achieving high ionic conductivity is crucial for restricting the sub-reactions of solid-state LOBs.

关键词： Solid polymer electrolyte Lithium-oxygen batteries Polyrotaxane ion conductivity Hydrophobic chain

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Effect of Length Scale Tuning of Background Error in WRF-3DVAR System on Assimilation of High-Resolution Surface Data for Heavy Rainfall Simulation

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Advances in Atmospheric Sciences 2012年第6期29卷 1142-1158页

作者： Ji-hyun HA dong-Kyou lee Atmospheric Sciences Program School of Earth and Environmental SciencesSeoul National UniversitySeoul 151-747Korea

We investigated the impact of tuning the length scale of the background error covariance in the Weather Research and Forecasting （WRF） three-dimensional variational assimilation （3DVAR） system. In particular, we studied the effect of this parameter on the assimilation of high-resolution surface data for heavy rainfall forecasts associated with mesoscale convective systems over the Korean Peninsula. In the assimilation of high-resolution surface data, the National Meteorological Center method tended to exaggerate the length scale that determined the shape and extent to which observed information spreads out. In this study, we used the difference between observation and background data to tune the length scale in the assimilation of high-resolution surface data. The resulting assimilation clearly showed that the analysis with the tuned length scale was able to reproduce the small-scale features of the ideal field effectively. We also investigated the effect of a double-iteration method with two different length scales, representing large and small-length scales in the WRF-3DVAR. This method reflected the large and small-scale features of observed information in the model fields. The quantitative accuracy of the precipitation forecast using this double iteration with two different length scales for heavy rainfall was high; results were in good agreement with observations in terms of the maximum rainfall amount and equitable threat scores. The improved forecast in the experiment resulted from the development of well-identified mesoscale convective systems by intensified low-level winds and their consequent convergence near the rainfall area.

关键词： WRF 3DVAR tuning surface data heavy rainfall

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