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Simultaneous surface modification method for 0.4Li2MnO3-0.6LiNi1/3Co1/3Mn1/3O2 cathode material for lithium ion batteries： Acid treatment and LiCoPO4 coating

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Nano Research 2017年第12期10卷 4210-4220页

作者： Min-Joon Lee Eunsol Lho Pilgun Oh Yoonkook son Jaephil Cho Department of Energy Engineering School of Energy and Chemical Engineering Ulsan National Institute of Science and Technology(UNIST) Ulsan 44919 Republic of Korea

Li-rich layered cathode materials have been considered the most promising candidates for large-scale Li-ion batteries due to their low cost and high reversible capacity. However, these materials have many drawbacks that hinder commercialization, such as low initial efficiency and cyclability at elevated temperatures. To overcome these barriers, we propose an efficient and effective surface modification method, in which chemical activation （acid treatment） and LiCoPO4 coating were carried out simultaneously. During the synthesis, the lithium ions were extracted from the lattice, leading to improved Columbic efficiency, and these ions were used for the formation of LiCoPO4. The Ni and Co doped spinel phase was formed at the surface of the host material, which gives rise to the facile pathway for lithium ions. The LiCoPO4 and highly doped spinel on the surface acted as double protection layers that effectively prevented side reactions on the surface at 60℃. Moreover, the transition metal migration of the modified cathode was weakened, due to the presence of the spinel structure at the surface. Consequently, the newly developed Li-rich cathode material exhibited a high 1st efficiency of 94%, improved capacity retention of 82% during 100 cycles at 60℃, and superior rate capability of 62% at 12C （1C = 200 mA/g） rate at 24℃. In addition, the thermal stability of the modified cathode was significantly improved as compared to that of a bare counterpart at 4.6 V, showing a 60% decrease in the total heat generation.

关键词： lithium ion battery cathode material Li-rich material electrochemistry surface modification

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Simultaneous lateral and subxiphoid access methods for safe and accurate resection of a superior vena cava aneurysm:A case report

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World Journal of Clinical Cases 2023年第31期11卷 7635-7639页

作者： Sang Pil Kim Joohyung son Department of Thoracic and Cardiovascular Surgery Kyunghee University HospitalSeoul 02447South Korea Department of Thoracic and Cardiovascular Surgery Pusan National University Yangsan HospitalYangsan-si 50612South Korea

BACKGROUND Superior vena cava(SVC)aneurysms are a relatively uncommon disease that has not been widely *** conventional surgical approach for treating SVC aneurysms includes open thoracotomy and ***,in this case,the aneurysm could be safely resected by thoracoscopic simultaneous lateral and subxiphoid access *** SUMMARY A 58-year-old male presented with intermittent chest pain and persistent discomfort in the chest area.A chest computed tomography scan revealed a 6.2 cm aneurysm in the left innominate vein and SVC *** surgical resection,simultaneous lateral and subxiphoid access were planned to achieve optimal proximal and distal aneurysm *** approach site was 1 cm below the xiphoid process,the fifth mid-axillary line and the seventh anterior axillary line on the right *** aneurysm was resected using a *** patient was discharged on the third day after chest tube removal on the second postoperative day with no particular *** Aneurysms located within the mediastinum can be accessed through thoracoscopic approach without open surgery and safely resected using vascular staples.

关键词： Aneurysm Cardiopulmonary bypass Superior vena cava Minimal invasive surgery Video assisted thoracic surgery Case report

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Two-stage dynamic recrystallization and texture evolution in Al-7Mg alloy during hot torsion

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International Journal of Minerals,Metallurgy and Materials 2024年第8期31卷 1900-1911页

作者： Kwang Tae son Chang Hee Cho Myoung Gyun Kim Ji Woon Lee School of Mechanical Industrialand Manufacturing EngineeringOregon State UniversityCorvallis OR 97331USA Department of Materials Science Engineering Northwestern UniversityEvanston IL 60208USA Research Institute of Industrial Science and Technology(RIST) Pohang 37673Rep.of Korea Division of Advanced Materials Engineering Kongju National UniversityCheonan 31080Rep.of Korea Center for Advanced Materials and Parts of Powders Kongju National UniversityCheonan 31080Rep.of Korea

Hot torsion tests were performed on the Al-7Mg alloy at the temperature ranging from 300 to 500℃ and strain rates between 0.05 and 5 s^(-1) to explore the progressive dynamic recrystallization(DRX)and texture *** DRX behavior of the alloy manifested two distinct stages:Stage 1 at strain of≤2 and Stage 2 at strains of≥*** Stage 1,there was a slight increase in the DRXed grain fraction(X_(DRX))with predominance of discontinuous DRX(DDRX),followed by a modest change in X_(DRX) until the transition to Stage *** 2 was marked by an accelerated rate of DRX,culminating in a substantial final X_(DRX) of~*** backscattered diffraction(EBSD)analysis on a sample in Stage 2 revealed that continuous DRX(CDRX)predominantly occurred within the(121)[001]grains,whereas the(111)[110]grains underwent a geometric DRX(GDRX)evolution without a noticeable sub-grain ***,a modified Avrami’s DRX kinetics model was utilized to predict the microstructural refinement in the Al-7Mg alloy during the DRX *** this kinetics model did not accurately capture the DDRX behavior in Stage 1,it effectively simulated the DRX rate in Stage *** texture index was employed to assess the evolution of the texture isotropy during hot-torsion test,demonstrating significant improvement(>75%)in texture randomness before the commencement of Stage *** initial texture evolution is attributed to the rotation of parent grains and the substructure evolution,rather than to an increase in X_(DRX).

关键词： Al-7Mg alloys hot deformation hot torsion tests dynamic recrystazlliation microstructure texture

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Improved speech absence probability estimation based on environmental noise classification

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Journal of Central South University 2012年第9期19卷 2548-2553页

作者： son Young-ho LEE Sang-min Department of Electronic Engineering Inha University Institute for Information and Electronics Research Inha University

An improved speech absence probability estimation was proposed using environmental noise classification for speech enhancement.A relevant noise estimation approach,known as the speech presence uncertainty tracking method,requires seeking the "a priori" probability of speech absence that is derived by applying microphone input signal and the noise signal based on the estimated value of the "a posteriori" signal-to-noise ratio(SNR).To overcome this problem,first,the optimal values in terms of the perceived speech quality of a variety of noise types are ***,the estimated optimal values are assigned according to the determined noise type which is classified by a real-time noise classification algorithm based on the Gaussian mixture model(GMM).The proposed algorithm estimates the speech absence probability using a noise classification algorithm which is based on GMM to apply the optimal parameter of each noise type,unlike the conventional approach which uses a fixed threshold and smoothing *** performance of the proposed method was evaluated by objective tests,such as the perceptual evaluation of speech quality(PESQ) and composite *** was then evaluated by a subjective test,namely,mean opinion scores(MOS) under various noise *** proposed method show better results than existing methods.

关键词： speech enhancement soft decision speech absence probability Gaussian mixture model (GMM)

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Exercise-induced muscle fatigue in the unaffected knee joint and its influence on postural control and lower limb kinematics in stroke patients

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Neural Regeneration Research 2017年第5期12卷 765-769页

作者： Sun Wook Park Sung Min son Na Kyung Lee Department of Physical Therapy Faculty of Health Science Eulji University Department of Physical Therapy College of Health Science Cheongju University Department of Physical Therapy College of Rehabilitation Science Daegu University

This study aimed to investigate the effects of exercise-induced muscle fatigue in the unaffected knee joint on postural control and kinematic changes in stroke patients. Forty participants（20 stroke patients, 20 age-matched healthy participants） were recruited. To induce fatigue, maximum voluntary isometric contractions were performed in the unaffected knee joint in a Leg Extension Rehab exercise machine using the pneumatic resistance. We measured static and dynamic balance and lower-limb kinematics during gait. Changes in postural control parameters anteroposterior sway speed and total center of pressure distance differed significantly between the stroke and control groups. In addition, changes in gait kinematic parameters knee and ankle angles of initial contact differed significantly between stroke（paretic and non-paretic） and control groups. Muscle fatigue in the unaffected knee and ankle impaired postural control and debilitates kinematic movement of ipsilateral and contralateral lower limbs, and may place the fatigued stroke patients at greater risk for falls.

关键词： nerve regeneration knee muscle fatigue stroke postural control gait kinemetics neural regeneration

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Recovery of cerebellar peduncle injury in a patient with a cerebellar tumor: validation by diffusion tensor tractography

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Neural Regeneration Research 2014年第21期9卷 1929-1932页

作者： Min-Su Kim Hyeong Jun Tak Su Min son Department of Neurosurgery School of MedicineYeungnam UniversityDaeguRepublic of Korea Department of Physical Medicine and Rehabilitation School of MedicineYeungnam UniversityDaeguRepublic of Korea

The cerebellum has a complex network and relates to various clinical functions including ataxia, gait disturbance, hearing and vision, cognition and affective control. Cerebellar peduncles are the structure connecting the cerebellum to the brain stem and the cerebrum. There exist three cerebellar peduncles. The superior cerebellar peduncle （SCP） involves vestibular sense and proprio- ception connecting to the thalamocortical pathway. The middle cerebellar peduncle （MCP） is the largest structure among the three cerebellar peduncles conveying impulses from the cerebral cortex to the cerebellum through corticopontocerebellar tract.

关键词： Recovery of cerebellar peduncle injury in a patient with a cerebellar tumor validation by diffusion tensor tractography DTI

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Antioxidant effect of indirect moxibustion on healthy subjects:a pilot study

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Journal of Traditional Chinese Medicine 2012年第4期32卷 590-595页

作者： Hyejung Park Hyeunggeug Kim Sara Yoo Namhun Lee Changgue son Liver and Immunology Research Center Daejeon Oriental Hospital of Oriental Medical College of Daejeon University22-5 Daehung-dongJung-guDaejeon 301-724Republic of Korea

OBJECTIVE:Moxibustion has long been thought to promote vital energy or immunity through clinical *** study aimed to investigate the clinical effects of indirect moxibustion on antioxidant and immunomodulation in a normal ***:Twenty-five healthy volunteers with no objective or subjective disorders were *** participants were treated with indirect moxibustion on acupoints Guanyuan(CV 4) and Shenque(CV 8) three times per week for 4 *** serum levels of reactive oxygen species(ROS) and malondialdehyde(MDA),the total antioxidant capacity(TAC),the activities of catalase and superoxide dismutase(SOD),and the total glutathione content were determined before and after the 12th *** subpopulations and 42 cytokines in the peripheral blood were analyzed using flow cytometry and antibody array,***:Compared with the initial time point,the serum levels of ROS and MDA were significantly lowered by moxibustion,while TAC was increased(P<0.01 for all).A significant increase was observed in catalase activity(P<0.05),but not in SOD or total *** were no significant changes in lymphocyte subpopulations or cytokines in the peripheral *** of 25 participants reported at least one symptom in which they felt subjective improvement after ***:Indirect moxibustion on acupoints CV 4 and CV 8 improved the antioxidant defense system,which may be a mechanism explaining the clinical effects of moxibustion.

关键词： Moxibustion Point CV 4 (Guanyuan) Point CV 8 (Shenque) Antioxidants Pilot projects

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JA but not JA-Ile is the cell-nonautonomous signal activating JA mediated systemic defenses to herbivory in Nicotiana attenuata

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Journal of Integrative Plant Biology 2017年第8期59卷 552-571页

作者： Tobit A. Bozorov son Truong Dinh Ian T. Baldwin Department of Molecular Ecology Max Planck Institute for Chemical EcologyHans-Knoll-Str.8D-07745JenaGermany Institute of Genetics and Plants Experimental Biology Uzbek Academy of SciencesYukori-Yuz111226KibrayTashkent RegionUzbekistan Department of Plant Biotechnology Faculty of Biotechnology-Vietnam National University of AgricultureNgo Xuan Quang Street100000HanoiVietnam

The whole-plant activation of defense responses to wounding and herbivory requires systemic signaling in which jasmonates （JAs） play a pivotal role. To examine the nature of the slower cell-nonautonomous as compared to the rapid cell-autonomous signal in mediating systemic defenses in Nicotiana attenuata, reciprocal stem graftingexperiments were used with plants silenced for the JA biosynthetic gene ALLENE OXIDE CYCLASE （irAOC） or plants transformed to create JA sinks by ectopicalIy expressing Arabidopsis JA-O-methyltransferase （ovJMT）. JA-impaired irAOC plants were defective in the cell-nonautonomous signaling pathway but not in JA transport. Conversely, ovJMT plants abrogated the production of a graft-transmissible JA signal. Both genotypes displayed unaltered cell-autonomous signaling. Defense responses （17-hydroxygeranyllinalool diterpene glycosides, nicotine, and proteinase inhibitors） and metabolite profiles were differently induced in irAOC and ovJMT scions in response to graft-transmissible signals from elicited wild type stocks. The performance of Manduca sexta larvae on the scions of different graft combinations was consistent with the patterns of systemic defense metabolite elicitations. Taken together, we conclude that JA and possibly MeJA, but not JA-lle, either directly functions as a long-distance transmissible signal or indirectly interacts with long distance signal（s） to activate systemic defense responses.

关键词： @@

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Structural stability estimation of whirling unit

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中国有色金属学会会刊：英文版 2009年第B9期19卷 202-208页

作者： son-Jae HWAN Han-Chang WOO Lee-Sang RYONG Lee-Young MOON Daegu Machinery Institute of Component & Materials Foundation Department of Automobile Yeungnam College of Science & Technology Department of Mechanical Engineering Kyung pook National University

Whirling is a cutting process in which a series of cutting edges on whirling ring remove material by turning over a rotating workpiece. In this study static and dynamic stability of whirling unit was estimated by using ADAMS and NASTRAN softwares. Each maximum force acting on the bearing attached to the spindle assembly and the cutting tool attached to the whirling ring with the rotating speed of 6 000 r/min was 235 N and 902 N respectively. The maximum stress of 0.74 MPa on the base frame is far smaller than the yield strength of 282 MPa. The calculated natural frequency of 148 Hz of the system is far from the frequency of the driving speed of 6 000 r/min. The experimentally obtained maximum cutting force of 792 N is smaller than that of calculated value. And the experimentally obtained natural frequency of 118 Hz is beyond the driving speed of 6000 r/min. From above results it can be judged that the whirling system is statically and dynamically stable.

关键词：旋转工件稳定性评价 NASTRAN软件动态稳定性结构单元固有频率行车速度

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Effects of Momentum Ratio and Weber Number on Spray Half Angles of Liquid Controlled Pintle Injector

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Journal of Thermal Science 2015年第1期24卷 37-43页

作者： Min son Kijeong Yu Jaye Koo Oh Chae Kwon Jeong Soo Kim Korea Aerospace University School of Aerospace and Mechanical Engineering Korea Aerospace University School of Mechanical Engineering Sungkyunkwan University Department of Mechanical Engineering Pukyong National University

A pintle injector is advantageous for throttling a liquid rocket engine and reducing engine weight. This study ex- plores the effects of momentum ratio and Weber number at various injection conditions on spray characteristics of the pintle injector for liquid-gas propellants. A liquid sheet is injected from a center pintle nozzle and it is broken by a gas jet from an annular gap. The pressure drops of propellants, and the pintle opening distance were consi- dered as control variables; using 0.1 -1.0 as a bar for the pressure drop of the liquid injection, a 0.01-4）.2 bar for the pressure drop of gas jet and a 0.2 - 1.0 mm for the pintle opening distance. The discharge coefficient was de- creased linearly before the pintle opening distance of 0.75 mm and then, the coefficient was slightly increased. Spray images were captured by a CMOS camera with high resolution. Then, the shadow and reflected images were analyzed. Spray distributions were measured by a pattemator with an axial distance of 50 mm from a pintle tip. Finally, the spray half angles had an exponentially decreasing correlation as a momentum ratio divided by the Weber number. Also, the spray half angles from the spray distribution were underestimated compared to those measured from the captured images.

关键词： Pintle Injector Spray Half Angle Spray Distribution Visualization

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