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Serial Changes of Heat Shock Protein 70 and Interleukin-8 in Burn Blister Fluid
( Kicheol Yoo ),( Kang Yeol Suh ),( Gi Hun Choi ),( In-suk Kwak ),( Dong Kook Seo ),( Dohern Kym ),( Hyeon Yoon ),( Yong Se Cho ),( Hye One Kim ) 대한피부과학회 2017 Annals of Dermatology Vol.29 No.2
Background: It has been reported that heat shock protein 70 (HSP70) and interleukin-8 (IL-8) play an important role in cells during the wound healing process. However, there has been no report on the effect of HSP70 and IL-8 on the blisters of burn patients. Objective: This study aimed to evaluate the serial quantitative changes of HSP70 and IL-8 in burn blisters. Methods: Twenty-five burn patients were included, for a total of 36 cases: twenty cases on the first day, six cases on the sec-ond, five cases on the third, three cases on the fourth, and two cases on the fifth. A correlation analysis was performed to de-termine the relationship between the concentration of HSP70 and IL-8 and the length of the treatment period. Results: The HSP70 concentration was the highest on the first day, after which it decreased down to near zero. Most HSP70 was generated during the first 12 hours after the burn accident. There was no correlation between the concen-tration of HSP70 on the first day and the length of the treat-ment period. No measurable concentration of IL-8 was de-tected before 5 hours, but the concentration started to in-crease after 11 hours. The peak value was measured on the fourth day. Conclusion: While HSP70 increased in the first few hours and decreased afterwards, IL-8 was produced after 11 hours and increased afterward in burn blister fluid. These findings provide new evidence on serial changes of in-flammatory mediators in burn blister fluid. (Ann Dermatol 29(2) 194∼199, 2017)
Phase separation in kinetic sprayed bulk metallic glasses
Yoon, Sanghoon,Xiong, Yuming,Kang, Kicheol,Bae, Gyuyeol,Lee, Changhee Institute of Physics [etc.] 2009 Journal of Physics. D, Applied Physics Vol.42 No.18
<P>During a kinetic spray process, a high strain rate (∼10<SUP>9</SUP> s<SUP>−1</SUP>) induced phase separation of amorphous metals at an impact interface was observed using high resolution transmission electron microscopy. The decrease in viscosity induced by the high strain rate deformation effect acted as the driving force for this process. The phase was further separated by jetting due to differences in the viscosity of the separated phases. The amorphous phase was sustained against nanocrystallization due to a fast quenching rate within the melting jet, even though the composition was separated far from the glass-forming region.</P>
ASYMMETRIC ELECTRON DISTRIBUTIONS IN THE SOLAR WIND
Rha, Kicheol,Ryu, Chang-Mo,Yoon, Peter H. IOP Publishing 2013 ASTROPHYSICAL JOURNAL LETTERS - Vol.775 No.1
<P>A plausible mechanism responsible for producing asymmetric electron velocity distribution functions in the solar wind is investigated by means of one-dimensional electrostatic particle-in-cell (PIC) simulation. A recent paper suggests that the variation in the ion-to-electron temperature ratio influences the nonlinear wave-particle dynamics such that it results in the formation of asymmetric distributions. The present PIC code simulation largely confirms this finding, but quantitative differences between the weak turbulence formalism and the present PIC simulation are also found, suggesting the limitation of the analytical method. The inter-relationship between the asymmetric electron distribution and the ion-to-electron temperature ratio may be a new useful concept for the observation.</P>
박기철(Kicheol Park),윤주식(Jushik Yoon),이기호(Kiho Lee),김경수(Kyungsoo Kim),김동권(Dongkwon Kim),김승우(Seungwoo Kim) 한국유체기계학회 2003 유체기계 연구개발 발표회 논문집 Vol.- No.-
Asynchronus high speed turbo blower of 100HP class with gas bearing supports is developed. The high speed motor is cooled by air and it's RPM is controlled by high frequency inverter to adjust inlet flow rate. Product family is ranged from 50 to 200HP and covered by three frames. Highly efficient impeller is designed and proved by performance test on system. Overall measured system efficiency is 82% including motor and inverter. The motor efficiency is about 95%. It is designed to guarantee to operate at ambient temperature of 35 Deg.C and max 45 DegC. Gas bearing with high load capacity is developed to support heavy rotor on low rotational speed.
Giant perineal condyloma acuminatum in adolescent pregnancy
( Hyon Jee Yoon ),( Jae Young Pae ),( Ji Hye Cho ),( Kicheol Kil ) 대한산부인과학회 2019 대한산부인과학회 학술대회 Vol.105 No.-
The giant condyloma acuminatum is a type of human papilloma virus-associated sexually transmitted infection. Treatment options for condyloma acuminatum remain controversial, but surgery seems to be the best option. We present a case in a 16-year old pregnant woman with giant masses that covered the perineal and perianal region in labor. After delivered the baby vaginally, we removed the tumor at postpartum 2 months.
Simulation study on the nonlinear evolution of EMIC instability
라기철,류창모,Rha, Kicheol,Ryu, Chang-Mo,Yoon, Peter H. 한국천문학회 2012 天文學會報 Vol.37 No.2
Charged particle energization is an outstanding problem in space physics. This paper investigates the nonlinear dynamics of Alfve'n-cyclotron waves accompanying particle heating processes and the drift Alfv'en-cyclotron (or EMIC) instability associated with a current disruption event on 29 January 2008 observed with THEMIS satellite by means of a particle-in-cell simulation. The simulation shows that the drift Alfv'en-cyclotron instabilities are excited in two regimes, a relatively low frequency mode propagating in a quasi-perpendicular direction while the second high-frequency branch propagating in a predominantly parallel propagation direction, which is consistent with observation as well as earlier theories. It is shown that parametric decay processes lead to an inverse cascade of Alfv'en-cyclotron waves and the generation of ion-acoustic waves by decay instability. It is also shown that the nonlinear decay processes are accompanied by small perpendicular heating and parallel cooling of the protons, and a pronounced parallel heating of the electrons.
Oxidation and crystallization mechanisms in plasma-sprayed Cu-based bulk metallic glass coatings
Kim, Junghwan,Kang, Kicheol,Yoon, Sanghoon,Kumar, S.,Na, Hyuntaek,Lee, Changhee Elsevier 2010 Acta materialia Vol.58 No.3
<P><B>Abstract</B></P><P>Cu-based bulk metallic glass (BMG) coatings were built-up by the atmospheric plasma spraying (APS) process at different hydrogen flow rates. As the hydrogen flow rate increased, thermal energy in the plasma jet increased the melting state of the Cu-based BMG particles. Although it was expected that the difference in melting states would quantitatively affect the amorphous fractions in the coatings, both the amorphous fraction and the oxide content of the layers were independent of hydrogen flow rate. However, different melting states resulting from different hydrogen gas flow rates, and the subsequent oxidation which inevitably occurred during spraying, generated different crystallization processes in the coating. In this paper, crystallization mechanisms in plasma-sprayed BMG were studied using their microstructures. Specific analyses of the particles deposited at high travel speed and quenched in cold water also served for further understanding of the melting state and change in composition of the particles undergo during deposition.</P>
Tri-functionalized electrolyte additive as an interfacial stabilizer for lithium metal anodes
Ye Jin Jeon,Subin Lee,Kicheol Kim,Jeong Ae Yoon,Taeeun Yim 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.127 No.-
Li metal has received noticeable interest as a post-anode material, however, many critical hurdles remainin its application in conventional batteries. Herein, we have designed and prepared an additive, the AF,that is functionalized by three individual functional groups: vinyl-, bis(fluorosulfonyl)imide-, and acetalfunctional groups. The AF-additive promotes forming solid-electrolyte interphase (SEI) layers at the Limetal interface via electrochemical reduction at a higher potential than that found in the carbonatebasedelectrolyte, which is predominately composed of inorganic species, such as lithium fluoride, ratherthan polycarbonate. The ionic conductivity of the electrolyte with the AF-additive is well retained evenwhen the amount of AF-additive is increased because the acetal functional group may form acetal–Li+complexes, which encourages Li+ migration. The AF-additive controlled electrolyte offers improvedcycling retention in the both Li/Li symmetric cell and Li/NCM cell because the AF-additive not only effectivelysuppresses electrolyte decomposition at the interface of Li metal but also inhibits the formation ofLi dendrites based on enhanced Li metal stability.