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허남양,장훈석 용인대학교 국제스포츠과학연구원 체육과학연구소 2008 體育科學硏究論叢 Vol.18 No.1
The purpose of this study was to analysis of the result, Seeks the physical elements which influence to non-distance. The research which sees gives and the man a junior golf players and 7 people professional golf players after criminal record and analyzes the physical VIP whom the which is periodic in the object to execute training, measures to non-distance in method of training reaches most plentifully is first, the pliability, criticism formation, agility and muscular endurance all increase, all appeared with the fact that is the difference which considers statistically. Second, non-distance and pliability (r=.458), criticism formation (r=.119) and agility (r=.717) the interrelation does not consider statistically not to be, only the muscular endurance VIP non-distance and appeared with the fact that is the interrelation (r=.872) which is static (+) considers statistically (p=.011). Three, in the physical VIP appeared with the fact that only the resultant muscular endurance VIP who executes the phased (stepwise) regression analysis affects in non-distance.
Jung-Hun Moon,Sang-Kyu Lee,Kyung-Hee Kim,Moon-Seok Kang,Hwa-Young Heo,Young-Up Kwon,Jung-Hyun Nam,Yong Weon Seo,Byung-Moo Lee 韓國作物學會 2003 Korean journal of crop science Vol.48 No.1
Immature and mature embryos of 18 Korean wheat genotypes were cultured in vitro to develop an efficient method of callus formation and plant regeneration, and to compare the responses of both embryo cultures. Immature and mature embryos were placed on a solid agar medium containing the MS salts and vitamins, 30g/l maltose, 2 mg/l 2,4-dichlorophenoxyacetic acid (2,4-D), and amino acids. The developed calli were maintained on regeneration medium containing MS salts and B5 vitamins, 20 g/l sucrose, and the combination of two plant growth regulators, 6-benzylaminopurine (BAP) and indole-3-acetic acid (IAA). Immature embryos in most genotypes showed high efficiency of callus induction except three genotypes; Eunpamil, Chunggemil, and Namhaemil, and significant differences among the genotypes. Plant regeneration of calli induced from immature embryos showed high efficiency in Geurumil (56.5%), Tapdongmil (50.5%), Gobunmil (45.5%), and Urimil(42.2%). The analysis of variance showed significant differences for regeneration frequency among the genotypes. Mature embryos showed low callus induction frequency compared with that in immature embryos, and significant differences among the genotypes. Plant regeneration of calli induced from mature embryos showed high efficiency in Keumkangmil (33.33%), Tapdongmil(28.13%), and Geurumil (27.78%). The analysis of variance showed significant differences for plant regeneration frequency among the genotypes.
고위도 지역에서 내한성 차나무 육성을 위한 국내외 수집종의 생육 및 특성분석
허남기(Nam-Kee Heo),이광재(Kwang-Jae Lee),김희연(Hee-yeon Kim),임상현(Sang-hyen Leem),함헌주(Heon-Joo Ham),김경희(Kyeng-Hee Kim),이철훈(Cheol-Hun Lee),한상섭(Sang-seob Han) 한국차학회 2010 한국차학회지 Vol.16 No.2
This study investigated the genetic characteristics of tea tree lines collected both in Korea and abroad via a functional analysis of growing features such as cold hardiness. The purpose of this study was to determine the conditions required for the stable cultivation of tea trees in Goseong at high altitudes and under climatic conditions less favorable than those in southern regions. In accordance with the analysis, 8 lines including GS 1 showed stronger cold hardiness than Yabukida, the standard variety, and the harvest period was faster by 1 to 4 days compared to Yabukida. The number of leaves per stock was 102 to 155 in 6 lines. In accordance with the analysis on indoor freezing (EC), 16 lines had high resistance to freezing with LT50 (winter killing temperature) from -10.15 to -12.42oC. The total catechin content was 4.79 to 7.16%, similar to or lower than that of Yabukida. However, GS 8 and GS 15 had higher GCg and ECg values, respectively. The GS 7 and GS 18 lines had lower caffeine content, whereas the tannin content was lower in the G21 line. RAPD classified the varieties into 3 groups based on 75% similarity. It was found that 3 lines, GS 15, GS 19 and GS 21, were genetically very similar. It was estimated that 5 lines, GS 15, 16, 19, 21 and GS 22, which were selected according to strong cold hardiness, can be grown as promising lines at high altitudes.
Removal of Perchlorate Using Reverse Osmosis and Nanofiltration Membranes
Jong Hun Han,Choong Sik Kong,Ji Yong Heo,Yeo Min Yoon,Hee Bum Lee,Nam Guk Her 대한환경공학회 2012 Environmental Engineering Research Vol.17 No.4
Rejection characteristics of perchlorate (ClO₄ -) were examined for commercially available reverse osmosis (RO) and nanofiltration (NF) membranes. A bench-scale dead-end stirred-cell filtration system was employed to determine the toxic ion rejection and the membrane flux. Model water solutions were used to prepare ClO₄- solutions (approximately, 1,000 ug/L) in the presence of background salts (NaCl, Na₂SO₄, and CaCl₂) at various pH values (3.5, 7, and 9.5) and solution ionic strengths (0.001, 0.01, and 0.01 M NaCl) in the presence of natural organic matter (NOM). Rejection by the membranes increased with increasing solution pH owing to increasingly negative membrane charge. In addition, the rejection of the target ion by the membranes increased with increasing solution ionic strength. The rejection of ClO₄- was consistently higher for the RO membrane than for the NF membrane and ClO₄ - rejection followed the order CaCl₂ < NaCl < Na₂SO₄ at conditions of constant pH and ionic strength for both the RO and NF membranes. The possible influence of NOM on ClO₄- rejection by the membranes was also explored
윤소남(So Nam Yun),정황훈(Hwang Hun Jeong),함영복,김동건(Dong-Gun Kim),허덕열(Duk-Yeal Heo) 대한기계학회 2011 大韓機械學會論文集A Vol.35 No.10
연료전지 내의 작동유체는 폭발성을 가지고 있기 때문에 솔레노이드 밸브의 실링특성은 일반적인 시스템에 비해 매우 중요하다 할 수 있다. 하지만, 이 시스템의 경우 작동 온도가 일반적인 경우에 비해 비교적 높으며, 작동 유체의 화학적 특성 때문에 실링에 사용되는 재질은 내화학성이 뛰어나면서도 연료전지 시스템에서 요구하는 수명을 보장해야 하는 어려움이 있다. 본 연구에서는 연료전지 내에서 사용가능한 솔레노이드 밸브의 실링 특성을 확인하기 위하여, 내화학성이 뛰어난 실링용 링의 재질인 불소고무에 대한 수명을 아레니우스(Arrhenius) 관계식을 이용하여 예측하였다. 또한, 수상치환법을 이용하여 실제 제작된 연료전지용 솔레노이드 밸브가 제품으로써 충분히 사용가능함을 확인하였다. The solenoid valve used in fuel cell system need to have good sealing performance because the work fluid can explode in the system. Moreover, the temperature of the work fluid is extremely high in order to maintain the properties of the rubber ring that seals the solenoid valve. This study deals with the rubber ring which is made from a fluoro-elastomer. The life cycle of the rubber ring was estimated by the relational expression of Arrhenius, and the solenoid valve was tested to confirm the sealing characteristics.
Lee, Donghyun,Heo, Dong Nyoung,Lee, Sang Jin,Heo, Min,Kim, Jeongho,Choi, Samjin,Park, Hun-Kuk,Park, Young Guk,Lim, Ho-Nam,Kwon, Il Keun Elsevier 2018 APPLIED SURFACE SCIENCE - Vol.432 No.2
<P><B>Abstract</B></P> <P>Poly(lactide-co-glycolide) (PLGA) is a biocompatible and biodegradable polymer that has been widely used in devices for tissue engineering and drug delivery applications. Gold nanoparticles (GNPs) have also been used as biomaterials and have been found to have a positive effect on bone formation. In this study, we synthesized thiol end-capped PLGA (PLGA-SH) and used it for binding GNPs. This PLGA was processed into a sheet form via electrospinning. GNPs with an approximate size of 30nm were attached onto the PLGA-SH sheet surfaces (PLGA-GNPs). This membrane was characterized by thermogravimetric analysis, ultraviolet/visible spectrophotometry, field emission scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, and confocal laser scanning microscopy. Characterization results show that the GNPs are well attached on the PLGA-SH sheet and it is possible to control the GNPs load. Additionally, in-vitro results showed that PLGA-GNPs have good biocompatibility. They were also found to enhance osteogenic differentiation of human adipose derived stem cells. From these results, we have determined that the PLGA-GNP fibers can be useful as materials for bone regeneration and can also potentially serve as drug carriers.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We designed and prepared a novel PLGA nanofibrous sheet for binding GNPs using a simple process. </LI> <LI> The objective this study was to design a process for manufacturing PLGA-GNPs nanofibrous sheets which can be applied to biomaterials. </LI> <LI> The biocompatibility and osteoinductive effect of PLGA-GNPs were demonstrated through in vitro test using a human adipose derived stem cells. </LI> <LI> The developed scaffolds may be suitable as bone cell proliferation substrates for use in bone tissue engineering applications. </LI> </UL> </P>