한국잔디 수집계통들 중에서 우수계통들의 생육특성 비교

임용우(Y. W. Rim),김기용(K. Y. Kim),김맹중(M. J. Kim),성병렬(B. R. Sung),임영철(Y. C. Lim),정의수(E. S. Chung),신홍균(H. K. Shin),김용선(Y. S. Kim) 한국잡초학회·한국잔디학회 2003 Weed & Turfgrass Science Vol.17 No.2,3

2001년 수집된 한국잔디 133계통들 중에서 우수한 계통들을 선발하기위하여 밀도(품질),<br/> 피복성, 녹색기간, 내병성, 출수유무(종자수) 등의 주요특성과 그 외 생육특성들이 조사되었다. 생육특성이 우수한 6계통이 선발되었으며 그 결과를 요약하면 다음과 같다.<br/> 수집된 133계통들 중에서 가장 녹색기간이긴 계통은 J01067으로 11월초까지 녹색도를 유지하였다. J01106 및 J01129 계통들은 엽폭이 각각 1.5mm 및 2mm 정도로 매우 좁으며, 밀도가 높고, 피복성도 좋은 것으로 나타났으며, 내병성도 강하였다. J01122 계통은 들잔디 계통들 중에서 유일하게 내병성이 강한 계통으로 선발되었다. J01128 계통은 엽폭이 3.2mm로 중엽에 속하였으며, 대비품종인 Sunburst 와 비슷하였다. 이 계통의 경우도J01106, J01129 계통들과 마찬가지로 밀도가 높고 내병성이 강한 것으로 나타났다.<br/> 수집된 133계통들의 형태적 분류를 위하여 5가지의 생육특성을 사용하여 크게 세가지 군집<br/> 으로 분류하였으며, 그 중에서 대비품종으로 사용된 6품종들과 선발된 우수 6계통의 분류는<br/> 다음과 같다. 제 1군집에 속하는 품종 및 계통은 Belare, Meyer, 안양중지(Anyang-jungji), J01067, J01112 등이 포함되었으며, 제 2군집으로는 S-94, J01105가 포함되었고, 제 3군집에는 Sunburst, 건희(Konhee), J01106, J01128, J01129 등이 포함되었다. Growth characteristics such as density(quality), covering speed, green period, disease resistance, heading existence(number of seeds) and other characteristics were examined for selection of superior lines among the 133 zoysiagrass lines collected in 2001. Six superior lines were selected and the results were summarized as follows.<br/> Superior line, J01067 was longest for green period among the 133 zoysiagrasses and stayed green until the beginning of November. Leaf width of J01106 and J01129 lines was very narrow as 1.5㎜ and 2㎜, respectively and superior for density(quality), covering speed and disease resistance. J01122 line was selected for strongest disease resistance among the lines of Zoysia japonica. Leaf width of J01128 was 3.2㎜ showing midium type and similar to standard cultivar, Sunburst. This line also showed higher density and strong disease resistance like J01106 and J01129.<br/> Five growth characteristics for morphological classification of 133 zoysiagrass lines<br/> was used and divided into 3 cluster groups. Of 133 lines, 6 standard cultivars and 6 superior lines were classified as follows. First cluster group contained Belare, Meyer, Anyang-jungji, J01067, J01122, and second group contained S-94 and J01105, and third group contained Sunburst, Konhee, J01106, J01128 and J01129.<br/> <br/>

Quasi-Monoenergetic Electron-Beam Generation Using a Laser Accelerator for Ultra-Short X-ray Sources

J Kim,고도경,석희용,H Jang,김형택,I Hwang,최일우,J Lim,J. Lee,J. H. Sung,K.-H. Hong,허민섭,N Hafz,유승훈,유태준,T. M. Jeong,V Kulagin,Y.-C. Noh 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.I

Two types of electron acceleration methods have been conducted to generate quasi-monoenergetic electron beams. Multi-MeV quasi-monoenergetic high-charge electron beams were generated at Korea Electrotechnology Research Institute (KERI) from self-modulated laser wakefield acceleration by using a collimator with a 2 TW (1.4 J/700 fs) Nd:glass/Ti:sapphire hybrid laser system and a supersonic nitrogen gas jet. The peak electron energy was 3.6 MeV, and the energy spread was 4 MeV. These electron beams are useful for the generation of short-pulse X-rays in the water window region, which is 250 eV -- 500 eV (2.5 -- 5 nm), by using Thomson scattering. The calcualted photon spectrum indicates the scattered photon covers the water window region. This can be used for a high spatial and temperal resolution microscope for medical imaing. To generate higher-energy electron beams with small energy spread, a laser wakefield acceleration experiment with a sharp downward electron density gradient was conducted with a 100 TW laser system at Advanced Photon Research Insistitute (APRI). With the electron density gradient, some background plasma electrons could be locally injected in the laser wake wave and a small energy spread was expected. Using the pre-pulse, we could generate sharp downward electron density gradients. The gradient scale length was 20 $\mu$m for a 25 \% density change. With this electron density gradient, we could get more reproducible electron beams than we could without the density gradient.

Particle distribution in melt-processed Y_1.5 Ba₂Cu₃O_x superconductors with BaCeO₃ addition

Youn, J.S.,No, K.,Kim, Y.H.,Mahmood, A.,Jun, B.H.,Han, Y.H.,Sung, T.H.,Kim, C.J. North-Holland 2009 Physica. C, Superconductivity Vol.469 No.15

To understand the effect of BaCeO<SUB>3</SUB> on a Y<SUB>2</SUB>BaCuO<SUB>5</SUB> (Y211) distribution, Y<SUB>1.5</SUB>Ba<SUB>2</SUB>Cu<SUB>3</SUB>O<SUB>x</SUB> (Y1.5) superconductors with/without 1wt.% BaCeO<SUB>3</SUB> additions were prepared by a top-seeded melt-textured growth (TSMG) process. Two different BaCeO<SUB>3</SUB> powders (as-synthesized (coarse powder) and an attrition-milled (fine powder)) were used and the size effect was compared with that obtained from a Y1.5 sample with no addition. A refinement of the Y211 particles was achieved for both the as-synthesized and attrition-milled BaCeO<SUB>3</SUB> additions. The distribution of the Y211 particles was most uniform in the Y1.5 sample prepared with the attrition-milled BaCeO<SUB>3</SUB> powder due to the reduced size of the Y211-free regions by the fine size BaCeO<SUB>3</SUB> addition. The highest J<SUB>c</SUB> was achieved in the Y1.5 sample prepared with the attrition-milled BaCeO<SUB>3</SUB> powder. The J<SUB>c</SUB> result agreed well with the microstructure variations by the addition of BaCeO<SUB>3</SUB> powders.

영양물 정주시의 체내호르몬 반응에 관한 연구 : 위암환자에서 본 영양물 투여시의 insulin 및 HGH 반응 Insulin and growth hormone responses following oral or intravenous alimentation in patient with far advanced gastric cancer

이진오,성호경,고주환,유용운,이종원,김진용,이장규 대한핵의학회 1975 핵의학 분자영상 Vol.9 No.2

심히 진행된 위암 환자에서 경정맥 포도당 투여시의 insulin 및 성장 호르몬 반응을 관찰하고 경구 투여시와 비교 검토하였다. 다시 위암 환자에게 아미노산 용액을 투여하고 혈중 insulin 농도와 성장 호르몬 농도 및 혈당량을 경시적으로 측정하고 정상인에서의 결과와 비교하여 다음의 결과를 얻었다. 1) 위암 환자에게 포도당 용액을 경구 부하하면 혈중 포도당 농도의 상승은 감소되었다. 2) 위암 환자에게 포도당 용액을 경구투여하였더니 insulin 반응은 정상인에서보다 감소되어 경정맥투여시와 유사하였다. 3) 위암 환자에게 포도당 용액 또는 아미노산용액을 경정맥 투여하여 성장 호르몬 농도의 상승을 관찰하였다. 4) 위암 환자에게 아미노산 용액을 정맥내로 투여하면 정상인에서와 같이 경구투여시에 비하여 insulin 반응의 감소가 관찰되었다. 5) 위암 환자에게 포도당 경정맥 투여시의 insulin 반응이 경구 투여시와 유사한 점에 대하여 고찰하였으며 아미노산 경정맥 투여시에는 insulin 반응에 유의할 필요성을 지적하였다. Glucose tolerance, insulin and growth hormone responses following glucose for amino acids administration by means of parenteral or oral load were studied in patients with far advanced gastric cancer. Hormone responses following nutrients load showed in patients with gastric cancer were compared to those of healthy subjects. Results were as follows: 1) Blood sugar appearance following oral glucose administration was diminished in patients with far advanced gastric cancer. 2) The insulin responses of gastric cancer following oral glucose were also diminished as compared to that of normal subjects and were identical with parenteral route. 3) Parenteral administration of glucose or amino acids to patients with gastric cancer resulted in a increase of plasma growth hormone level. 4) Lower insulin response to amino acids was observed on parenteral administration in patient with gastric cancer as in healthy subjects. 5) Author discussed that the low insulin response after oral glucose administration showed in gastric cancer, and any additional insulin requirement arise when longer periods of parenteral amino acid administration are necessary, as in the patient with malnutritions. $quot;

Detection of Herpes Simplex Virus Type-1 DNA by In Situ Polymerase Chain Reaction

Choi, J. H Korean Dermatological Association 1995 Annals of Dermatology Vol.7 No.3

서울지역 4년제 간호대학생들의 임상실습 유,무에 따른 진로태도성숙

권혜진,김보람,김소연,김수임,성정아,신영미,윤서진,이경진,홍영선,이자형,정덕유,신혜원 이화여자대학교 간호과학대학 2009 이화간호학회지 Vol.- No.43

This study was conducted to investigate the differences in the degrees of career attitude maturity according to the clinical practice experience of the college of nursing students. The convenience sample was 275 students attending the college of nursing in Seoul. Data was obtained through a questionnaire from December 1st to 12th, 2008. The instrument used to measure the career attitude maturity in this study was "A barometer of maturity in career attitudes" developed by Ki-hak, Lee(1997). The collected data were analyzed by descriptive statistics, Chronbach's alpha, t-test and ANOVA with the SPSS 16.0 program. Below is the result of this study. 1. The average score for career attitude maturity of nursing students who experienced clinical practices was 135.56(±12.17): higher than the average score of inexperienced students, 134.37(±12.44). However it could not show meaningful differences in the statistics(F=-.805, p=.422). 2. Determinacy, one of five subordinate concepts of career attitude maturity, was statistically significative. On average, the group comprised of students with clinical practices scored 27.60(±3.81): higher than that of unpracticed students, 26.63(±4.26)(F=-1.976, p=.049). 3. The more academic years they have, except for junior year students, the points of career attitude maturity relative to general characteristics were increasingly higher. The points were 132.60(±11.99) for freshmen, 135.93(±12.72) for sophomores, 133.50(±12.57) for juniors and 138.11(±11.24) for seniors(F=2.714, p=.045). 4. According to the age of the group, the grade of career attitude maturity became higher. The scores were 133.21(±12.34) for 18-19yrs., 134.05(±12.16) for 20-22yrs., 138.43(±10.96) for 23-26yrs. and 148.71(±12.76) for 27-32yrs. (F=5.118, p=.002). 5. The average total score for career attitude maturity of nursing students was 135.00(±12.30). Of the five subdivisions―readiness, conviction, determinacy, independence and finality― readiness demonstrated the highest result with 32.33(±4.46) followed by conviction, determinacy, independence and finality respectively. Based on the results, there are some proposals for further researches. As this research was only for college of nursing in Seoul, it is necessary to compare career attitude maturity with 3-year colleges and other departments. In addition, alongside clinical practices there is a growing need to develop programs that will not only provide guidelines but also prepare students for the maturity of their career attitude.

Tensile Strength, Elongation and Water Vapor Permeability of Chitosan-Based Biopolymer Film : 키토산 생고분자 필름의 기계적 물성 및 수중기 투과도

Park, Hyun J,Park, Jang W,Song, Jee J,Kang, Sung K,Peter J.Vergano,Robert F. Testin 한국키틴키토산학회 1997 한국키틴키토산학회지 Vol.2 No.3

키토산으로부터 생고분자필름을 제조하였으며 기계적물성 및 수증기 투과도를 측정하였다 키토산은 우수한 필름형성능력을 갖고 있었으며 인장강도의 경우 38-66 MPa로 폴리에틸렌 필름의 인장강도(13028 MPa)에 비하여 매우 높은 것으로 나타났다. 키토산 필름의 기계적 물성은 특히 여러가지 종류의 용매에 큰 영향을 받는 것으로 나타났다. 초산을 용매로한 키토산 필름의 인장강도는 66MPa로서 지금까지 만들어진 생고분자 필름의 인장강도중 가장 높은 값이다. 키토산 필름의 수증기 투과도는 0.34~0.60ng · m/· m2 · s · Pa이었으며, 수증기투과도는 용매에 의하여 영향을 받는 것으로 나타났다. 또한 키토산 필름의 수증기 투과도는 가연재의 농도가 증가 할 수록 증가하는 것으로 나타났다. Biopolymer films were made from chitosan and tested for gases and mechanical barrier properties. Chitosan film has an excellent film forming properties. Tensile strength (TS) of chitosan films was 38-66 MPa and had high mechanical barrier properties as they are compared with TS of polyethylene films (13-28 MPa). Mechanical properties of the chitosan-based films were affected by the concentration of plasticizers, molecular size of plasticizers, and solvent system. Especially, elongation (E) of the chitosan films drastically increased as the concentration of plasticizer increased. Mechanical properties of the films were greatly affected by various solvent system. TS of the films made from acetic acid increased to 66 MPa which was the highest among the TS of biopolymer films ever developed. Water vapor permeability (WVP) of chitosan film was 0.34-0.60 ng ·m/m2 · s · Pa and was affected by various solvent. WVP of the film increased as the concentration of plasticizer increased.

O-free polyacrylonitrile doping to improve the J_c(B) and H_c2 of MgB₂ wires

Hwang, S.M.,Sung, K.,Choi, J.H.,Kim, W.,Joo, J.,Lim, J.H.,Kim, C.J.,Park, Y.S.,Kim, D.H. North-Holland 2010 Physica. C, Superconductivity Vol.470 No.20

We selected polyacrylonitrile (PAN, -[C<SUB>3</SUB>H<SUB>3</SUB>N]-) as an O-free organic dopant and fabricated C-doped MgB<SUB>2</SUB> wires by in situ and powder-in-tube techniques. 0-5 wt.% PAN powders were uniformly mixed with B powder using a liquid mixing method. The precursor powders were mixed with Mg powder, filled into Fe tubes, and then drawn into wires. Sintering was performed at 900<SUP>o</SUP>C for 1h in a flowing Ar gas. The PAN doping decreased the critical temperature (T<SUB>c</SUB>) and a-axis lattice parameter, but significantly improved the critical current density (J<SUB>c</SUB>) in high fields, upper critical field (H<SUB>c2</SUB>), and irreversibility field (H<SUB>irr</SUB>) performances. These results are attributed to the replacement of B sites with C by the PAN doping. Furthermore, as expected, the MgO amount did not increase as the doping content increased. The J<SUB>c</SUB> of the PAN-doped MgB<SUB>2</SUB> wires was more than one order of magnitude higher than that of the undoped MgB<SUB>2</SUB> wire at 5K and 6.6T (1.46-3.82kA/cm<SUP>2</SUP> vs. 0.11kA/cm<SUP>2</SUP>).

New teleomorph combinations in the entomopathogenic genus <i>Metacordyceps</i>

Kepler, R.M.,Sung, G.-H.,Ban, S.,Nakagiri, A.,Chen, M.-J.,Huang, B.,Li, Z.,Spatafora, J.W. Informa UK (TaylorFrancis) 2012 Mycologia Vol.104 No.1

<P>The genus Metacordyceps contains arthropod pathogens in Clavicipitaceae (Hypocreales) that formerly were classified in Cordyceps sensu Kobayasi et Mains. Of the current arthropod pathogenic genera of Hypocreales, the genus Metacordyceps remains one of the most poorly understood and contains a number of teleomorphic morphologies convergent with species of Cordyceps s.s. (Cordycipitaceae) and Ophiocordyceps (Ophiocordycipitaceae). Of note, the anamorph genera Metarhizium and Pochonia were found to be associated only with Metacordyceps and demonstrated to be phylogenetically informative for the clade. Several species of Cordyceps considered to have uncertain placements (incertae sedis) in the current taxonomic framework of clavicipitoid fungi were collected during field expeditions mostly in eastern Asia. Species reclassified here in Metacordyceps include Cordyceps atrovirens Kobayasi & Shimizu, Cordyceps indigotica Kobayasi & Shimizu, Cordyceps khaoyaiensis Hywel-Jones, Cordyceps kusanagiensis Kobayasi & Shimizu, Cordyceps martialis Speg., Ophiocordyceps owariensis Kobayasi, Cordyceps pseudoatrovirens Kobayasi & Shimizu and Ophicordyceps owariensis f. viridescens (Uchiy. & Udagawa) G.H. Sung, J.M. Sung, Hywel-Jones & Spatafora. Incorporation of these species in a multigene phylogenetic framework of the major clades of clavicipitoid fungi more than doubled the number of species in Metacordyceps and allowed for refinement of morphological concepts for the genus consistent with the phylogenetic structure. Based on these findings we then discuss evolution of this genus, subgeneric relationships, anamorph connections, and suggest additional species that should be confirmed for possible inclusion in Metacordyceps.</P>

Study on the improved J_c(B) performance of polyacrylic acid-doped MgB₂ bulks

Hwang, S.M.,Lee, C.M.,Lee, S.M.,Sung, K.,Joo, J.,Lim, J.H.,Kang, W.N.,Kim, C.J. North-Holland 2010 Physica. C, Superconductivity Vol.470 No.suppl1

We fabricated polyacrylic acid (PAA)-doped MgB<SUB>2</SUB> bulks by wet mixing and in situ reaction process and studied the relationships between the phase formation, lattice change, microstructure, and critical properties according to the PAA doping level. The PAA doping increased the MgO amount and grain boundary area but decreased the a-axis lattice constant and critical temperature (T<SUB>c</SUB>), which is indicative of the substitution of B sites by C in MgB<SUB>2</SUB>. Furthermore, the critical current density (J<SUB>c</SUB>) at high magnetic fields improved with the increasing PAA content to 5.99kA/cm<SUP>2</SUP> for the 7wt% PAA-doped sample, which was about 6-fold higher than that of the pure sample at 5K and 6.6T. This improvement was mainly attributed to the C substitution and the fine grain size due to PAA doping, suggesting that PAA is an effective dopant in improving J<SUB>c</SUB>(B) performance of MgB<SUB>2</SUB>.