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Kwon, Seong Jung,Zhou, Hongjun,Fan, Fu-Ren F.,Vorobyev, Vasily,Zhang, Bo,Bard, Allen J. Royal Society of Chemistry 2011 Physical chemistry chemical physics Vol.13 No.12
<P>Collisions of several kinds of metal or metal oxide single nanoparticles (NPs) with a less catalytic electrode surface have been observed through amplification of the current by electrocatalysis. Two general types of current response, a current staircase or a current blip (or spike) are seen with particle collisions. The current responses were caused by random individual events as a function of time rather than the usual continuous current caused by an ensemble of a large number of events. The treatment of stochastic electrochemistry like single NP collisions is different from the usual model for ensemble-based electrochemical behaviour. Models for the observed responses are discussed, including simulations, and the frequency of the steps or blips investigated for several systems experimentally.</P> <P>Graphic Abstract</P><P>Electrochemical measurements of single nanoparticle collisions at an electrode correlate with random walk simulations. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c0cp02543g'> </P>
Impact source localization in plate utilizing multiple signal classification
Yang, HongJun,Lee, Young Jun,Lee, Sang Kwon SAGE Publications 2013 Proceedings of the Institution of Mechanical Engin Vol.227 No.4
<P>This article proposed a multiple signal classification method based on array signal processing for impact source localization in a plate. For source localization, the direction of arrival of the wave caused by an impact on a plate and the distance between the impact position and sensor should be estimated. The direction of arrival can be estimated accurately using the multiple signal classification method; the distance can be obtained using the time delay of arrival and the group velocity of the Lamb wave in a plate. The time delay of arrival is experimentally estimated using the continuous wavelet transform for the wave. The group velocity is theoretically obtained based on the elastodynamic theory.</P>
김은미,권민철,박홍준 東亞大學校 大學院 1999 大學院論文集 Vol.24 No.-
We deposit diamond-like carbon thin films at a substrate temperature of 60 ℃ by the electroysis of the methanol. Films are characterized by the x-ray diffractor and the scanning electron microscope. We obtain good quality diamond-like carbon thin films at a low applying bias of 600 V by adding a little quantity of the ammonia into the methanol solution. High nucleation density films are also deposited by the posttreatment in the hot filament chemical vapor deposition chamber.
Antiviral Activity of Chrysin Derivatives against Coxsackievirus B3 in vitro and in vivo
Song, Jae-Hyoung,Kwon, Bo-Eun,Jang, Hongjun,Kang, Hyunju,Cho, Sungchan,Park, Kwisung,Ko, Hyun-Jeong,Kim, Hyoungsu The Korean Society of Applied Pharmacology 2015 Biomolecules & Therapeutics(구 응용약물학회지) Vol.23 No.5
Chrysin is a 5,7-dihydroxyflavone and was recently shown to potently inhibit enterovirus 71 (EV71) by suppressing viral 3C protease ($3C^{pro}$ activity. In the current study, we investigated whether chrysin also shows antiviral activity against coxsackievirus B3 (CVB3), which belongs to the same genus (Enterovirus) as EV71, and assessed its ability to prevent the resulting acute pancreatitis and myocarditis. We found that chrysin showed antiviral activity against CVB3 at $10{\mu}M$, but exhibited mild cellular cytotoxicity at $50{\mu}M$, prompting us to synthesize derivatives of chrysin to increase the antiviral activity and reduce its cytotoxicity. Among four 4-substituted benzyl derivatives derived from C(5) benzyl-protected derivatives 7, 9-11 had significant antiviral activity and showed the most potent activity against CVB3 with low cytotoxicity in Vero cells. Intraperitoneal injection of CVB3 in BALB/c mice with $1{\times}10^6TCID_{50}$ (50% tissue culture infective dose) of CVB3 induced acute pancreatitis with ablation of acinar cells and increased serum CXCL1 levels, whereas the daily administration of 9 for 5 days significantly alleviated the pancreatic inflammation and reduced the elevation in serum CXCL1 levels. Collectively, we assessed the anti-CVB3 activities of chrysin and its derivatives, and found that among 4-substituted benzyl derivatives, 9 exhibited the highest activity against CVB3 in vivo, and protected mice from CVB3-induced pancreatic damage, simultaneously lowering serum CXCL1 levels.
Bayesian과 Bootstrap 방법을 이용한 수위-유량 관계곡선의 불확실성 분석
임종훈(Jonghun Lim),권형수(Hyungsoo Kwon),주홍준(Hongjun Joo),왕원준(Won-joon Wang),이종소(Jongso Lee),유영훈(Younghoon You),김형수(Hungsoo Kim) 한국습지학회 2019 한국습지학회지 Vol.21 No.2
본 연구는 수위-유량 관계곡선을 이용한 하천 유량 산정방법의 불확실성을 감소시키는 것을 목적으로 하였다. 하천 유량 자료는 수문해석과 수자원 관리를 하는데 있어서 필수적으로 요구되는 자료이기 때문에 정량적으로 정확한 산정 방법을 고찰할 필요가 있다. 이를 위해 Bayesian 및 Bootstrap 방법을 이용한 수위-유량 관계식의 매개변수와 기존의 매개변수를 비교하였으며, 불확실성을 평가하기 위해서 표준오차법에 -분포를 적용한 추정치 결과의 신뢰구간을 비교하였다. 그 결과, 본 연구를 통해 개발된 회귀분석에 의한 추정값은 약 1~5 %미만의 차이가 보이며, 각 지점에서 수위에 따라 기존보다 더 적용성이 우수한 결과를 보이는 부분도 존재함을 확인하였다. 따라서 본 연구에서 제시한 방법별로 하천의 특성 및 수위에 맞게적용한다면 보다 더 신뢰성 있는 유량 자료를 확보할 수 있을 것으로 생각된다. The objective of this study is to reduce the uncertainty of the river discharge estimation method using the stage-discharge relation curve. It is necessary to consider the quantitative and accurate estimation method because the river discharge data is essential data for hydrological interpretation and water resource management. For this purpose, the parameters estimated by Bayesian and Bootstrap methods are compared with the ones obtained by stage-discharge relation curve. In addition, the Bayesian and Bootstrap methods are applied to assess uncertainty and then those are compared with the confidence intervals of the results from standard error method which has t-distribution. From the results of this study, The estimated value of the regression analysis developed through this study is less than 1 ~ 5%. Also It is confirmed that there are some areas where the applicability is better than the existing one according to the water level at each point. Therefore, if we use more suitable method according to the river characteristics, we could obtain more reliable discharge with less uncertainty.
Large-Area Printed Broadband Membrane Reflectors by Laser Interference Lithography
Jung-Hun Seo,Jungho Park,Deyin Zhao,Hongjun Yang,Weidong Zhou,Byeong-Kwon Ju,Zhenqiang Ma IEEE 2013 IEEE photonics journal Vol.5 No.1
<P>We report here large-area broadband photonic crystal membrane reflectors (MRs) on glass substrates based on laser interference lithography (LIL) patterning and elastic stamp membrane transfer printing techniques. High-reflectivity broadband MRs on glass were realized with measured reflectivity of 95% around 1300 nm and a bandwidth of about 100 nm. Large-area nanopattern uniformity was experimentally verified with measured reflectivity from multiple locations of the large-area MRs. The work could lead to fabrication of the large-area high-performance MR at low cost with high throughput. The reflectors can be used in many types of optoelectronic and photonic devices.</P>
Antiviral Activity of Chrysin Derivatives against Coxsackievirus B3 in vitro and in vivo
( Jae-hyoung Song ),( Bo-eun Kwon ),( Hongjun Jang ),( Hyunju Kang ),( Sungchan Cho ),( Kwisung Park ),( Hyun-jeong Ko ),( Hyoungsu Kim ) 한국응용약물학회 2015 Biomolecules & Therapeutics(구 응용약물학회지) Vol.23 No.5
Chrysin is a 5,7-dihydroxyflavone and was recently shown to potently inhibit enterovirus 71 (EV71) by suppressing viral 3C protease (3Cpro) activity. In the current study, we investigated whether chrysin also shows antiviral activity against coxsackievirus B3 (CVB3), which belongs to the same genus (Enterovirus) as EV71, and assessed its ability to prevent the resulting acute pancreatitis and myocarditis. We found that chrysin showed antiviral activity against CVB3 at 10 μM, but exhibited mild cellular cytotoxicity at 50 μM, prompting us to synthesize derivatives of chrysin to increase the antiviral activity and reduce its cytotoxicity. Among four 4-substituted benzyl derivatives derived from C(5) benzyl-protected derivatives 7, 9-11 had significant antiviral activity and showed the most potent activity against CVB3 with low cytotoxicity in Vero cells. Intraperitoneal injection of CVB3 in BALB/c mice with 1×106 TCID50 (50% tissue culture infective dose) of CVB3 induced acute pancreatitis with ablation of acinar cells and increased serum CXCL1 levels, whereas the daily administration of 9 for 5 days significantly alleviated the pancreatic inflammation and reduced the elevation in serum CXCL1 levels. Collectively, we assessed the anti-CVB3 activities of chrysin and its derivatives, and found that among 4-substituted benzyl derivatives, 9 exhibited the highest activity against CVB3 in vivo, and protected mice from CVB3-induced pancreatic damage, simultaneously lowering serum CXCL1 levels.
Nanocage-Confined Synthesis of Fluorescent Polycyclic Aromatic Hydrocarbons in Zeolite
Ko, Seung Hyeon,Lee, Taekyoung,Park, Hongjun,Ahn, Doo-Sik,Kim, Kyoungsoo,Kwon, Yonghyun,Cho, Sung June,Ryoo, Ryong American Chemical Society 2018 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.140 No.23
<P>Polycyclic aromatic hydrocarbons (PAHs) attract much attention for applications to organic light-emitting diodes, field-effect transistors, and photovoltaic cells. The current synthetic approaches to PAHs involve high-temperature flash pyrolysis or complicated step-by-step organic reactions, which lead to low yields of PAHs. Herein, we report a facile and scalable synthesis of PAHs, which is carried out simply by flowing acetylene gas into zeolite under mild heating, typically at 400 °C and generates the products of 0.30 g g<SUP>-1</SUP> zeolite. PAHs are synthesized via acetylene polymerization inside Ca<SUP>2+</SUP>-ion-exchanged Linde type A (LTA) zeolite, of which the α-cage puts a limit on the product molecular size as a confined-space nanoreactor. The resultant product after the removal of the zeolite framework exhibits brilliant white fluorescence emission in <I>N</I>-methylpyrrolidone solution. The product is separated into four different color emitters (violet, blue, green, and orange) by column chromatography. Detailed characterizations of the products by means of various spectroscopic methods and mainly mass spectrometric analyses indicate that coronene (C<SUB>24</SUB>H<SUB>12</SUB>) is the main component of the blue emitter, while the green emitter is a mixture of planar and curved PAHs. The orange can be attributed to curved PAHs larger than ovalene, and the violet to smaller molecules than coronene. The PAH growth mechanism inside Ca<SUP>2+</SUP>-exchanged LTA zeolite is proposed on the basis of mass spectral analyses and density functional theory calculations.</P> [FIG OMISSION]</BR>