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Kang, Joo H.,Park, Je-Kyun WILEY-VCH Verlag 2007 Small Vol.3 No.10
<P>A magnetophoretic continuous purification method is presented of single-walled carbon nanotubes (SWCNTs) from the superparamagnetic iron-catalyst impurities in a microfluidic device without any influence on inherent SWCNT properties. By employing microfluidics and a magnetic-field-induced saw-tooth nickel microstructure, a highly enhanced magnetic force in adjoining microchannels is exploited. The iron impurities of SWCNTs are attracted towards areas of higher magnetic-flux density in the microchannels where magnetic field was asymmetrically generated perpendicularly to the streamline. We obtained highly purified SWCNTs at a rate of 0.36 mg h<SUP>−1</SUP> and that are estimated to be about 99 % purity.</P> <B>Graphic Abstract</B> <P>Good riddance: A magnetophoretic, continuous purification platform has been developed to rid single-walled carbon nanotubes of superparamagnetic iron-catalyst nanoparticles using the enhanced magnetic force of ferromagnetic microstructures in a microfluidic device, as shown in the image. <img src='wiley_img/16136810-2007-3-10-SMLL200700334-content.gif' alt='wiley_img/16136810-2007-3-10-SMLL200700334-content'> </P>
Moon, Young Kyun,Jung, Chang Goo,Park, Seok Joo,Kim, Tae Gyu,Kim, Soo H. Cambridge University Press (Materials Research Soc 2009 Journal of materials research Vol.24 No.4
<P>A method allowing for the stable growth of carbon nanotubes (CNTs) on the surface of a fibrous metal mesh substrate (SUS304) was developed with the assistance of the microwave plasma-enhanced chemical vapor deposition process. The controlled addition of up to ∼13% of O2 to the CH4 plasma reacting gas flow was found to promote the growth of the CNTs by oxidizing the amorphous carbon and removing the active H2 radicals. However, excessive amounts of O2 (i.e., fraction of O2 > ∼13%) and H2 were found to play a negative role in the growth of the CNTs. The control of the density and length of the CNTs was also achieved by varying the H2 plasma reduction time and CH4 plasma reacting time, respectively. Longer H2 reduction pretreatment of the catalytic metal islands resulted in the formation of a less dense CNT forest with craters. When the growth time of the CNTs was increased to ∼20 min, their length was increased to ∼10 μm. However, when the growth time of the CNTs exceeded 20 min, their length was significantly decreased, indicating that the continuous presence of O2 in the CH4 plasma destroys the preformed CNTs due to the oxidation reaction.</P>
취업 여부 및 연령에 따른 주부들의 스트레스 : 생활 사건 경험을 중심으로 In Terms of Life Experiences
신현균,원호택 서울大學校 社會科學大學 心理科學硏究所 1995 心理科學 Vol.4 No.1
본 연구는 주부들의 스트레스를 알아보고자 주부들이 경험하는 생활 사건을 조사하였다. 179명의 주부를 대상으로 자료를 수집해 취업 여부및 연령별로 분석하였다. 주부들이 지난 1년 동안 가장 많이 경험한 생활사건은 '식습관의 변화'였으며, 가장 부정적으로 평가한 생활사건은 '배우자 사망'과 '직장 퇴직'이었고 가장 긍정적으로 평가한 생활 사건은 '약혼'이었다. 취업주부는 전업주부에 비해 '개인적 일을 성취한 경험'이 더 많았으며 그것을 더 긍정적으로 평가하였고, '배우자와 다투는 횟수의 변화'와 '배우자와 화해한 경험'은 전업 주부에게서 더 많았다. 연령별 차이를 보면, 연령이 높아질수록 긍정적으로 평가하는 생활경험이 적었지만 부정적으로 평가하는 생활사건에서는 차이가 없었다. 마지막으로 본 연구의 제한점과 앞으로의 연구방향이 제시되었다. This study attempted to examine the life events that wives experience. The data from 179 wives were analysed with respect to employment and age. The results revealed that the most frequent life event during the past 1 year was 'change in eating habits'. And the most negative events were 'death of spouse' and 'retirement from work'; and the most positive event was 'engagement'. Working wives experience more positively than unemployed wives. Unemployed wives experienced more 'major change in number of arguments with spouse' and 'marital reconciliation with mate' than was no difference due to age in the negative life events. Finally, the limitations of this study and the suggestions for future research were discussed.
박노경,차균현,이주석,김형곤,주병권,강용섬 대한전자공학회 1996 CAD 및 VLSI 설계연구회지 Vol.5 No.1
The proposed SRAM reusing charge operate in 3.3 voltage and we obtain 33.3% power save efficiency compared to the conventional wordline access method due to resuing the current of first actived wordline gate capacitance at second actived wordline gate capacitance. In the case of this SRAM reusing charge, described in this paper, we obtained 5ns(200MHz) operation speed result in the HYUNDAI 0.6um CMOS technology. In this paper power saving is 30.75mW compaired to the conventional wordline access for one clock.
Osteogenic Repair by Bovine Bone Ash Derived Porous HA Ceramic Formed by Foaming Method
Yoon, J.H.,Park, J.H.,Park, Eui Kyun,Kim, Shin Yoon,Lee, J.H.,Park, I.K.,Kim, H.J.,Shin, Hong In Trans Tech Publications, Ltd. 2007 Key Engineering Materials Vol.342-343 No.-
<P>To develop a suitable scaffold optimizing bone regeneration, we developed bovine bone ash derived fully connected porous HA ceramic scaffolds adopting a foaming method. They revealed excellent biocompatibility. The attached cells on the scaffolds proliferated in multi-layers with osteoblastic differentiation. The bone defects grafted with bovine bone ash derived fully interconnected porous HA ceramics having average 500 μm sized spherical pores and average 150 μm sized interconnecting interpores with average 80% porosity were favorably healed without any pathologic changes within 3 weeks. New bone ingrowth with excellent osteoconduction through the spherical pores along the inner surface was noted from 1 week after implantation. Each spherical pore was filled with hematopoietic marrow and newly formed bone which with time was well integrated with the porous HA ceramic scaffold with time. These findings suggest that the bovine bone ash-derived fully interconnected porous HA ceramic formed by foaming method can be a promising bone substitute and a scaffold for bone tissue engineering.</P>
플라즈마 공중합 고분자 절연막과 펜타센 반도체막의 계면특성
신백균(Paik-Kyun Shin),임헌찬(H-C Lim),육재호(J-H Yuk),박종관(J-K Park),조기선(G-S Jo),남광우(K-Y Nam),박종국(J-K Park),김용운(Y-W Kim),정무영(M-Y Chung) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
Thin films of pp(ST-Co-VA) were fabricated by plasma deposition polymerization (PVDPM) technique. Properties of the plasma polymerized pp(ST-Co-VA) thin films were investigated for application to semiconductor device as insulator. Thickness, dielectric property, composition of the pp(ST-Co-VA) thin films were investigated considering the relationship with preparation condition such as gas pressure and deposition time. In order to verify the possibility of application to organic thin film transistor, a pentacene thin film was deposited on the pp(ST-Co-VA) insulator by vacuum thermal evaporation technique. Crystalline property of the pentacene thin film was investigated by XRD and SEM, FT-IR. Surface properties at the pp(ST-Co-VA)/pentacene interface was investigated by contact angle measurement. The pp(ST-Co-VA) thin film showed a high-k (k=4.6) and good interface characteristic with pentacene semiconducting layer, which indicates that it would be a promising material for organic thin film transistor (OTFT) application.
Jung, Chang H.,Yang, Yoo‐,Soo,Kim, Jun‐,Seob,Shin, Jae‐,Il,Jin, Yong‐,Su,Shin, Jae Y.,Lee, Jong H.,Chung, Koo M.,Hwang, Jae S.,Oh, Jung M.,Shin, Yeon‐,Kyun,Kweon, Dae Blackwell Publishing Ltd 2008 FEBS JOURNAL Vol.275 No.12
<P>Soluble <I>N</I>‐ethylmaleimide sensitive‐factor attachment receptor (SNARE) proteins have crucial roles in driving exocytic membrane fusion. Molecular recognition between vesicle‐associated (v)‐SNARE and target membrane (t)‐SNARE leads to the formation of a four‐helix bundle, which facilitates the merging of two apposing membranes. Synthetic peptides patterned after the SNARE motifs are predicted to block SNARE complex formation by competing with the parental SNAREs, inhibiting neuronal exocytosis. As an initial attempt to identify the peptide sequences that block SNARE assembly and membrane fusion, we created thirteen 17‐residue synthetic peptides derived from the SNARE motifs of v‐ and t‐SNAREs. The effects of these peptides on SNARE‐mediated membrane fusion were investigated using an <I>in vitro</I> lipid‐mixing assay, <I>in vivo</I> neurotransmitter release and SNARE complex formation assays in PC12 cells. Peptides derived from the N‐terminal region of SNARE motifs had significant inhibitory effects on neuroexocytosis, whereas middle‐ and C‐terminal‐mimicking peptides did not exhibit much inhibitory function. N‐terminal mimicking peptides blocked N‐terminal zippering of SNAREs, a rate‐limiting step in SNARE‐driven membrane fusion. Therefore, the results suggest that the N‐terminal regions of SNARE motifs are excellent targets for the development of drugs to block SNARE‐mediated membrane fusion and neurotransmitter release.</P>