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Radiologic factors related to double-bar insertion in minimal invasive repair of pectus excavatum

World Journal of Pediatrics 2015年第2期11卷 148-153页

作者： ki hwan kim ki Yeol Lee Jung Bok Lee Kyung-Sook Yang Jinwook hwang Bo Kyung Je Hyung Joo Park Department of Radiology Korea University College of MedicineAnsanKorea1 Department of Clinical Epidemiology and Biostatics Asan Medical CenterUniversity of Ulsan College of MedicineSeoulKorea Department of Biostatistics Korea University College of MedicineSeoulKorea Departmentof Thoracic Surgery Korea University College of MedicineAnsanKorea Department of Thoracic and Cardiovascular Surgery Seoul St.Mary's Hospitalthe Catholic University of KoreaSeoulKorea

Background:Pectus excavatum is the most common congenital chest wall deformity,with a high incidence in live *** study aimed to evaluate the measured factors on CT images related to the number of pectus bars for surgical ***:A total of 497 patients who had undergone minimally invasive repair between April 2007 and July 2011 were classified into single-bar(n=358)and doublebar(n=139)insertion *** measured eight distinct distances and one angle on CT scans to reflect quantitative *** analysis and multivariate logistic regression analysis were performed to detect statistically significant association between radiologic measurements and the pectus bars ***:After adjusting for age and gender,the transverse distance(T),the transverse distance of the depression area(A),the inclined distance of the depression area(B),the AP distance of the depression area(C),the depression angle(G),and the eccentric distance of deformity(E)were significantly correlated with double-bar *** regression model showed that age(,P<0.0001),gender(P<0.0001),depression angle(G)(P<0.0001),direction of the depression(DD)(P<***1)and depression depth(D)(P<0.0001)were significantly associated with doublebar ***:CT scan provides useful factors which can be of assistance in predicting the number of pectus bars for the surgical correction of pectus excavatum.

关键词： computed tomography Nuss procedure pectus excavatum

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Novel Influenza A（H1N1）Infection Rate of Exposed Person Without Respiratory Protector in Hospital

Novel Influenza A（H1N1）Infection Rate of Exposed Person Wi...

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中国医院协会第十七届全国医院感染管理学术年会暨第九届东...

作者： Oh Mee Kweon Dongsuk Lee Eun Suk Park Chang Oh kim Sang Hun Han June Myung kim ki hwan kim Ju Hyun Lee Eun Jin Ha Kyungwon Lee Department of Infection Control Yonsei University College of Medicine SeoulKorea Severance Hospital Division of Infectious Diseases Department of Internal Medicine Yonsei University College of Medicine SeoulKorea Department of Pediatrics Yonsei University College of Medicine SeoulKorea Department of Laboratory Medicine Yonsei University College of MedicineSeoulKorea

＜正＞Background Novel influenza A（H1N1） is transmitted by air or ***,we should wear the respiratory protector to prevent infection spread during contact with infected or suspected *** purpose of this study is to investigate the infection status of the exposed persons who made a contact without a respiratory protector in the

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Characteristics of radiation and convection heat transfer in indirect near-infrared-ray heating chamber

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Journal of Central South University 2011年第3期18卷 731-738页

作者： CHOI Hoon-ki YOO Geun-jong kim Churl-hwan School of Mechatronics Changwon National University

Numerical study was performed to evaluate the characteristics of combined heat transfer of radiation, conduction and convection in indirect near infrared ray （N/R） heating chamber. The effects of important design parameters such as the shape of heat absorbing cylinder and heat releasing fin on the pressure drop and heat transfer coefficient were analyzed with different Reynolds numbers. The Reynolds numbers were varied from 103 to 3x106, which was defined based on the hydraulic diameter of the heat absorbing cylinder. Analyses were performed to obtain the inner and outer flow and the temperature distributions in the heat absorbing cylinder and the rates of radiation heat transfer and convection heat transfer. As the Reynolds number increases, the convection heat transfer rate is increased while the radiation heat transfer rate is decreased. The average convection heat transfer rate follows a power rule of the Reynolds number. Addition of three-dimensional heat releasing fin to the outside of the heat absorbing cylinder enhances the convection heat transfer.

关键词： near infrared ray indirect near infrared ray heater absorbing cylinder heat releasing fin radiation heat transfer convection heat transfer Reynolds number

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Microstructural evolution in lithium plating process and its effect on the calendar storage life

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Nano Research 2024年第10期17卷 8834-8841页

作者： ki hwan Koh Dong Ju Lee Anthony Mu Kangwoon kim Taehee kim Zheng Chen Department of Chemical and Nano Engineering University of California San DiegoLa JollaCA 92093USA Program of Materials Science and Engineering University of California San DiegoLa JollaCA 92093USA Sustainable Power and Energy Center University of California San DiegoLa JollaCA 92093USA

The growing demand for electric vehicles highlights the need for energy storage solutions with higher densities,spotlighting Li metal anodes as potential successors to traditional Li-ion batteries(LIBs).Achieving longer calendar aging life for Li metal anodes is crucial for their practical use,given their propensity for corrosion due to a low redox potential,which leads to compromised cycling stability and significant capacity loss during *** research investigated that this susceptibility is mainly dependent on the surface area of Li metal anode and the properties of the solid electrolyte interphase(SEI),particularly its stability and growth *** research adds to this understanding by demonstrating that the amount of Li plating is a key factor in its corrosion during open-circuit storage,as assessed across various *** discovered that increasing the Li plating amount effectively reduces Coulombic efficiency(C.E.)loss during aging,due to a lower surface area-to-Li *** implies that the choice of electrolyte for optimal storage life should consider the amount of Li plating,with higher capacities promoting better storage characteristics.

关键词： lithium metal batteries anode-free batteries calendar life of batteries lithium anode corrosion

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New para-magnetic(CoFeNi)(50)(CrMo)(50-x)(CB)x(x=20,25,30)non-equiatomic high entropy metallic glasses with wide supercooled liquid region and excellent mechanical properties

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Journal of Materials Science & Technology 2020年第8期36卷 135-143页

作者： Jeong Tae kim Sung hwan Hong Jin Man Park Jürgen Eckert ki Buem kim Erich Schmid Institute of Materials Science Austrian Academy of Sciences(ÖAW)Jahnstrae 128700LeobenAustria Hybrid Materials Center(HMC) Department of Nanotechnology and Advanced Materials EngineeringSejong University209Neungdong-roGwangjin-guSeoul143-747Republic of Korea Global Technology Center(GTC) Samsung Electronics Co.Ltd129 Samsung-roYeongtong-guSuwonsiGyeonggi-do443-742Republic of Korea Department of Materials Science Chair of Materials PhysicsMontanuniversität LeobenJahnstraße 128700LeobenAustria

In this study,high entropy metallic glasses(HEMGs)were developed through a combination of concepts for designing metallic glasses(main element+transition metal+metalloid element)and high-entropy alloys(more than five elements,each element having an atomic concentration between 5 at.%and 35 at.%).The developed metallic glass alloys are composed of Co-Fe-Ni main elements,transition metals(Cr,Mo)and metalloid elements(C,B).Moreover,the present work reports the thermal,mechanical and magnetic properties of(CoFeNi)(50)(CrMo)(50-x)(CB)x alloys with x=20,25,*** developed as-spun HEMGs exhibit typical paramagnetic properties even for a high amount of ferromagnetic elements(Co,Fe,and Ni)and have high elastic modulus(103–160 GPa)and hardness(14–27 GPa),thus possessing mechanical properties similar to well-known Co-based metallic glasses(Co-Cr-Mo-C-B system).In addition,some of the bulk samples prepared with a diameter of 2 mm form bulk metallic glasses with a high compressive strength around 3.5 *** mechanisms determining the stability of the supercooled liquid,as well as the paramagnetic and mechanical properties for the developed non-equiatomic HEMGs,are discussed.

关键词： Metallic glasses Paramagnetism High entropy alloys Phase stability

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A Study of the Vortical Flow over a Delta Wing with a Leading Edge Extension

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Journal of Thermal Science 2003年第4期12卷 299-303页

作者： Heuy-Dong kim Young-ki Lee Tae-Ho kim Myoung-hwan Sohn School of Mechanical Engineering Andong National University Andong 760-749 KoreaSchool of Mechanical Engineering Andong National University Andong 760-749 KoreaSchool of Mechanical Engineering Andong National University Andong 760-749 KoreaDepartment of Aerospace Engineering Korean Air Force Academy Chongwon-gun ChungBook-Do 363-849 Korea

The present paper describes computational and experimental work on the vortex flow characteristics of a sharp-edged delta wing with a leading edge extension (LEX). Experiment was carried out using a low-speed wind tunnel that has a test section of 3.5 m(W)×2.45 m(H)×8.7 m(L). The angle of attack of the delta wing ranges from 10° to 30°. The free stream velocity is fixed at 20 m/s, which corresponds to Reynolds number of 0.88×106. Computations using the mass-averaged implicit 3D Navier-Stokes equations were applied to predict the complicated vortical flow over the delta wing. The governing equations were discretized in space using a fully implicit finite volume differencing formation. The standard k-e turbulent model was employed to close the governing equations. The present computations predicted the experimented flow field with a good accuracy.

关键词： delta wing leading edge extension (LEX) vortex core vortex strength.

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Effectiveness and safety of traditional Chinese herbs in children with cough variant asthma: a systematic review and Meta-analysis

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Journal of Traditional Chinese Medicine 2021年第5期41卷 661-668页

作者： Kyou-hwan Han ki Haeng Cho CUI Shanqin Lily Lin Jaejong kim Department of data analysis SBU Research Institute of Integrative MedicineSouth Baylo University2727 West 6th StreetLos AngelesCA 90057USA SBU Research Institute of Integrative Medicine South Baylo University2727 West 6th StreetLos AngelesCA 90057USA Department of Library South Baylo University2727 West 6th StreetLos AngelesCA 90057USA

OBJECTIVE:To systematically investigate the clinical effectiveness and safety of traditional Chinese herbs(TCHs)as an alternative to conventional medicine(CM)in children with cough variant asthma(CVA).METHODS:Randomized controlled trial(RCT)studies that were published from their inceptions to March 31,2020,were identified from the electronic databases of China National Knowledge Infrastructure,Wangfang,Pub Med,and Cochrane Central *** primary outcome of the review was the total effective rate(TER),and the secondary outcomes were immunoglobulin E(Ig E),peak expiratory flow(PEF),adverse drug reactions,and relapse rates of ***:For the Meta-analysis,13 studies involving 992 children with CVA were *** terms of TER and Ig E,the experimental interventions of TCH,when compared with the control interventions of CM,on pediatric CVA were found to be significantly effective(P<0.0001),whereas for spirometry,PEF was not significantly improved in the TCH group(P=0.48).The incident rates of adverse drug reaction and relapse were found to be significantly lower in the TCH group than those in the CM group(P=0.02 and P<0.0001,respectively).CONCLUSION:Compared with CM therapy,the effects of TCH therapy on pediatric CVA were significantly beneficial in terms of TER and Ig E,but not for PEF,and the methodological quality of included studies was ***,the results should be interpreted with *** randomized controlled trials with rigorous experimental methodologies are required for objectivity in the future.

关键词： cough variant asthma child drugs,Chinese herbal randomized controlled trial systematic review Meta-analysis

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Fault area estimation using traveling wave for wide area protection

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Journal of Modern Power Systems and Clean Energy 2016年第3期4卷 478-486页

作者： Jae-Won LEE Won-ki kim Joon HAN Won-Hyeok JANG Chul-hwan kim Department of Electrical and Computer Engineering Sungkyunkwan UniversitySuwonRepublic of Korea Daewoo Shipbuilding&Marine Engineering Co. Ltd.GeojeRepublic of Korea Electrical and Computer Engineering Department University of Illinois at Urbana-ChampaignChampaignILUSA

As the increasing number of Phasor Measurement Units(PMUs) are deployed, wide area protection in power systems has been gaining interest. In particular, fault detection, fault classification and fault area estimation are essential to reduce the damage of faults, and even prevent catastrophic cascades of failures. In this paper, we present a scheme for fault area estimation using PMUs and traveling wave theory. The purpose of this paper is to formulate a scheme for fault area estimation by calculating the approximate fault location based on traveling wave *** research has targeted at reliable operation of wide transmission system through the estimation of fault *** verify the suggested scheme, the various simulations are performed in practical Korean power transmission *** simulation results show that the proposed scheme has a good performance with high accuracy for estimating fault area.

关键词： Fault area estimation Phasor measurement unit(PMU) Transmission line system Traveling wave Wide area protection

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Characteristics of turbulent flow distribution in branch piping system

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Journal of Central South University 2012年第11期19卷 3208-3214页

作者： YOO Geun-jong CHOI Hoon-ki kim Chul-hwan School of Mechatronics Changwon National UniversityChangwon 641-773Korea

Flow distribution in branch piping system is affected by flow characteristics and different geometric variations. Most of the flow distribution studies are performed with one-dimensional analysis to yield overall information only. However, detailed analysis is required to find effects of design parameters on the flow distribution. For this aspect, three-dimensional turbulent flow analysis was performed to assess turbulence model performance and effects of upstream pressure and branch pipe geometry. Three different turbulence models of standard k-e model, realizable k-e model and standard k-co yield similar results, indicating small effects of turbulence models on flow characteristics analysis. Geometric variations include area ratio of main and branch pipes, branch pipe diameter, and connection shape of main and branch pipes. Among these parameters, area ratio and branch diameter and shape show strong effect on flow distribution due to high friction and minor loss. Uniform flow distribution is one of common requirements in the branch piping system and this can be achieved with rather high total loss design.

关键词： flow distribution pipe flow branch pipe turbulent flow

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Salt Tolerance in Rice: Focus on Mechanisms and Approaches

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Rice science 2017年第3期24卷 123-144页

作者： Inja Naga Bheema Lingeswara REDDY Beom-ki kim In-Sun YOON Kyung-hwan kim Taek-Ryoun KWON Genetic Engineering Division Department of Agricultural Biotechnology National Institute of Agricultural Sciences Rural Development Administration Jeonju-54874 South Korea

Salt tolerance is an important constrain for rice, which is generally categorized as a typical glycophyte. Soil salinity is one of the major constraints affecting rice production worldwide, especially in the coastal areas. Susceptibility or tolerance of rice plants to high salinity is a coordinated action of multiple stress responsive genes, which also interacts with other components of stress signal transduction pathways. Salt tolerant varieties can be produced by marker-assisted selection or genetic engineering by introducing salt-tolerance genes. In this review, we have updated on mechanisms and genes which can help in transferring of the salt tolerance into high-yielding rice varieties. We have focused on the need for integrating phenotyping, genomics, metabolic profiling and phenomics into transgenic and breeding approaches to develop high-yielding as well as salt tolerant rice varieties.

关键词： rice mechanism salinity salt tolerance yield gene protein

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