RISS 학술연구정보서비스

검색
다국어 입력

http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.

변환된 중국어를 복사하여 사용하시면 됩니다.

예시)
  • 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
  • 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
닫기
    인기검색어 순위 펼치기

    RISS 인기검색어

      검색결과 좁혀 보기

      선택해제
      • 좁혀본 항목 보기순서

        • 원문유무
        • 음성지원유무
        • 원문제공처
          펼치기
        • 등재정보
          펼치기
        • 학술지명
          펼치기
        • 주제분류
          펼치기
        • 발행연도
          펼치기
        • 작성언어
        • 저자
          펼치기

      오늘 본 자료

      • 오늘 본 자료가 없습니다.
      더보기
      • 무료
      • 기관 내 무료
      • 유료
      • KCI등재

        세관 양광주 방전에서 플라즈마 확산의 완전 해

        김동준,정종문,김정현,황하청,정재윤,조윤희,임현교,구제환,최은하,조광섭,Jin, D.J.,Jeong, J.M.,Kim, J.H.,Hwang, H.C.,Chung, J.Y.,Cho, Y.H.,Lim, H.K.,Koo, J.H.,Choi, E.H.,Cho, G.S. 한국진공학회 2010 Applied Science and Convergence Technology Vol.19 No.1

        관경이 수 mm인 세관 램프 내부에서 플라즈마의 확산을 조사하기 위하여 이극성(ambipolar) 확산방정식을 해하였다. 반경 방향의 확산에 의한 유리관 벽에서의 플라즈마 소멸 특성시간은 $\tau_r\;=\;(r_0/2.4)^2/D_a$로 주어진다. 반경 $r_0{\sim}1\;mm$이고 이극성 확산계수 $D_a{\sim}0.01\;m^2/s$ 이면, $\tau_r{\sim}17\;{\mu}s$이다. 이는 램프의 교류전원 구동에서 플라즈마를 유지하기 위한 구동 최소 주파수 ~30 kHz에 해당한다. 고전압이 인가되는 전극부에 발생한 고밀도의 플라즈마가 양광주로 확산되는 특성시간은 $\tau_z{\sim}0.1\;s$이다. 고밀도 플라즈마 경계에서의 시간에 대한 확산속도는 $t{\sim}10^{-6}\;s$일 때 $u_D{\sim}10^2\;m/s$이고, $t{\sim}10^{-3}\;s$이면 그 속도는 $u_D{\sim}1\;m/s$로 느려진다. 따라서 램프 길이 ~1 m에 대하여 전극부에서 생성된 고밀도 플라즈마가 양광주 전체로 확산되는 시간은 수 초가 걸린다. The ambipolar diffusion equation has been solved in a fine-tube lamp of a few mm in diameter. In the diffusion of radial direction, the plasma diffuses and vanishes away at the glass wall by recombination with the characteristic time of plasma loss is given by $\tau_r\;=\;(r_0/2.4)^2/D_a$. With the radius $r_0{\sim}1\;mm$ and the ambipolar diffusion coefficient $D_a{\sim}0.01\;m^2/s$, the vanishing time is calculated $\tau_r{\sim}10\;{\mu}s$ which corresponds to the least value of frequency 30 kHz for the sustaining the plasma in the operation of high voltage AC-power. In the diffusion of longitudinal z-direction, a high density plasma generated at the area of a high voltage electrode, diffuses into the positive column with the characteristic time $\tau_z{\sim}0.1\;s$. The plasma diffusion velocity at the boundary of high density plasma is $u_D{\sim}10^2\;m/s$ at the time $t{\sim}10^{-6}$ s and the diffusion velocity becomes slow as $u_D{\sim}1\;m/s$ at $t{\sim}10^{-3}\;s$. Therefore, for the long lamp of 1 m, it takes about several seconds for the high density plasma at the area of electrode to diffuse through the whole positive column space.

      • SCISCIESCOPUS

        Production of (S)-3-hydroxybutyrate by metabolically engineered Saccharomyces cerevisiae

        Yun, E.J.,Kwak, S.,Kim, S.R.,Park, Y.C.,Jin, Y.S.,Kim, K.H. Elsevier Science Publishers 2015 Journal of biotechnology Vol.209 No.-

        (S)-3-Hydroxybutyrate (S-3HB) can be used as a precursor for the synthesis of biodegradable polymers such as polyhydroxyalkanoate and stereo-specific fine chemicals such as antibiotics, pheromones, and drugs. For the production of S-3HB in yeast, the biosynthetic pathway of S-3HB from acetyl-CoA, consisting of the three enzymes, acetyl-CoA C-acetyltransferase (ACCT), acetoacetyl-CoA reductase (ACR), and 3-hydroxybutyryl-CoA thioesterase (HBT), was introduced into Saccharomyces cerevisiae. An engineered yeast strain overexpressing ERG10, hbd, and tesB genes not only exhibited enzyme activities of AACT, ACR, and HBT, but also produced S-3HB from ethanol. In order to increase the titer of S-3HB, a fed-batch fermentation based on pulse feeding of ethanol as a carbon source was performed, and a final S-3HB titer of 12.0g/L was achieved. This is the first report on the production of 3HB by engineered yeast, utilizing ethanol as the carbon source, suggesting that the industrially preferred S. cerevisiae can be a promising host for producing S-3HB.

      • Expression of mosquitocidal crystal protein genes in non-insecticidal Bacillus thuringiensis subsp. israelensis

        Gill, S.S.,Oh, H.W.,Lee, D.W.,Roh, J.Y.,Park, H.W.,Jin, B.R.,Je, Y.H.,Kang, S.K. 東亞大學校附設遺傳工學硏究所 1998 遺傳工學硏究 Vol.- No.5

        J.Y.ROH,H.W.PARK,Y.H.JE,D.W.LEE,B.R.JIN, H.W.OH,S.S.GILL AND S.K.KANG.1997. Bacillus thuringiensis NTB-1 isolated from soil samples in Korea produces ovoidal parasporal inclusions with proteins of approximately 24-40kDa in size. Although serological study indicated that the isolate has a flagella (H) antigen identical with subsp. israelensis, it seemed to be non-insecticidal against Lepidoptera and Coleoptera as well as Diptera. To investigate the activity of non-insecticidal B.thuringiensis transformed with insecticidal crystal protein genes, cryIVD and cytA genes of B. thuringiensis subsp. morrisoni PG-14, highly toxic to mosquito larvae, were introduced into the isolate NTB-1. The expression of mosquitocidal crystal protein genes in NTB-1 was characterized by SDS-PAGE analysis and electron microscopy. The results showed that crystalline inclusions of host, CryIVD and CytA were stably expressed in the transformant. However, the mosquitocidal activity of transformant was similar to that of B. thuringiensis subsp. kurstaki Cry-B harbouring cryIVD and cytA genes, demonstrating that a synergistic effect by an interaction of both introduced insecticidal and resident non-insecticidal crystal proteins was not observed.

      • 임상실습 간호대학생의 공감능력, 의사소통능력, 심리적 소진 간의 관계

        고재원,김지은,박진영,서혜영,신유진,이동민,정다은,진서정,최서원,XIE WEI,YANG JING,배성희,손지희 이화여자대학교 간호학회 2018 이화간호학회지 Vol.- No.52

        Purpose: The purpose of this study was to determine the relationship among empathy ability, communication ability, and psychological burnout in nursing students on clinical practice. Method: Data was collected using questionnaires between September 20th, 2017 to January 2th, 2018. Participants of this study were 159 of grade 3 and 4 nursing students who had completed at least one semester of clinical practice experience and currently attending universities located in Seoul. Data were analyzed using percentage, average, standard deviation, t-test, one-way ANOVA, Scheffe’s test and Pearson’s correlation coefficient using the SPSS WIN 24.0 program. Results: The empathy ability was positively correlated with communication ability(r=.437, p=.000). And the communication ability was negatively correlated with psychological burnout(r=-.390, p=.000). Also the empathy ability was negatively correlated with psychological burnout(r=-217, p=.006). Conclusion: These results suggest that psychological burnout is closely related to empathy ability and communication ability. Based on these results, empathy ability and communication ability need to be increased by efficient management and intervention to decrease the degree of psychological burnout in nursing students. Also, the findings should be considered when developing plans or education programs for nursing students’ major adjustment.

      • SCISCIESCOPUS

        Progress in the development of heating systems towards long pulse operation for KSTAR

        Kwak, J.G.,Bae, Y.D.,Chang, D.H.,Chang, D.S.,Hong, B.G.,Hwang, C.K.,In, S.R.,Jeong, S.H.,Jin, J.T.,Jung, K.S.,Kim, B.R.,Kim, J.,Kim, S.K.,Kim, T.S.,Lee, D.W.,Lee, K.W.,Oh, B.H.,Seo, C.S.,Seo, M.S.,Yoo International Atomic Energy Agency 2007 Nuclear fusion Vol.47 No.5

        <P>Construction of the Korea superconducting tokamak advanced research (KSTAR) tokamak is in its final phase. For the long-pulse KSTAR discharges, the ion cyclotron range of frequencies (ICRF) and neutral beam injection (NBI) heating systems are expected to play important roles through a selective heating of ions and electrons, control of the plasma pressure and current profiles, a core fuelling and beam diagnostics for the KSTAR. In addition, the ICRF system is expected to be used for possible discharge cleaning and assisting in the tokamak startup. In this paper, the recent progress in the development of the ICRF and the NBI heating systems is described. The four-strap ICRF antenna has been successfully tested for a voltage up to 41 kV for a pulse length of 300 s (to 46 kV for 20 s) in a test chamber. A prototype KSTAR NBI system has been developed. At present, the system has successfully produced a 1 MW beam power for 200 s and a 3.5 MW output beam power for 4 s.</P>

      • 여자 고등학생의 성태도와 부모 양육태도가 성폭력 인식수준에 미치는 영향

        강수인,김수민,김유진,김지수,박지원,신수경,이지현,장은주,정채린,진애경,차지영,이수연 이화여자대학교 간호과학대학 2019 이화간호학회지 Vol.- No.53

        Purpose: The study aimed to investigate the factors influencing consciousness of sexual violence in female high school students, focusing on sexual attitude and parental attitude. ethods: Data were collected from 248 female high school students in South Korea. A structured questionnaire was used for data collection through online survey. The collected data were analyzed by descriptive statistics, t-test, ANOVA, Tukey’s test, Pearson correlation coefficient, and multiple linear regression using the SPSS 25.0 program. Results: The mean score of consciousness of sexual violence in female high school students was 43.54 out of 48. The findings indicate that the mean score of consciousness of sexual violence differed y number of years in high school and academic achievement. Among sexual attitude, parental ttitude, and consciousness of sexual violence, there were meaningful correlations between onsciousness of sexual violence and sexual attitude (r=.132, p=.038,), love-hostility (r=.172, p=.006),and autonomous-control (r=.132, p=.038). Love-hostility aspect of parental attitude (=.159, p=.049) and academic achievement (=.208, p=.001) were found to be the important influencing factors on female high school student’s consciousness of sexual violence (F=5.720, p<.001). Conclusion: The findings of the study suggest that the love-hostility aspect of parental attitude and academic achievement influence consciousness of sexual violence of female high school students. Therefore, in order to improve consciousness of sexual violence in female high school students, sex education program and parent-education program should be developed with further research.

      • 셀프리더십에 따른 간호사의 직무만족도

        강수연,김수연,도혜진,이혜선,전소현,전혜실,주원진,지윤정,진소희,이자형,정덕유,유소연 이화여자대학교 간호과학대학 2009 이화간호학회지 Vol.- No.43

        In this study, we investigated how much job-satisfaction and self leadership nurses have. And making use of self leadership, we hope to enhance job- satisfaction and develop nurse organization. To find out the relationship between nurse's self leadership and Job-satisfaction, we carried out a sample survey : The subjects of our study are 150 nurses being in offices(hospitals) at the two university hospitals and three general hospitals in Seoul or Keong-gi province. Nurses agreed with and understood the purpose of our study. For analyzing the result, we used ANOVA of SPSS 14.0. The main results of our study are as follows : According to characteristic of subjects, level of self leadership has a meaningful difference statistically according to marriage, religion, department career, position. As for the marriage, the level of self leadership of the married are higher((F=19.95, p= .000) than the unmarried. . Level of self leadership perceived by subjects is an average 3.50 point. An average points of each factors are as follows : Self-compensation is 3.75 point, rehearsal is 3.57 point, self-expectation is 3.55 point, goal-setting is 3.53 point, self-criticism is 3.31 point, constructive thinking is 3.27 point. The total average is 62.9 point to 90 full marks. Level of self job-satisfaction perceived by subjects is an average 2.98 point to 5 full marks. Level of self job-satisfaction perceived by subjects is an average 2.98 point to 5 full marks. An average points of each factors are as follows : Interrelation is 3.42 point, interrelation between doctors and nurses is 3.35 point, job demand is 3.10 point, administration is 3.02 point, a professional position is 2.94 point, self control is 2.84 point, payment is 2.44 point. A coefficient of co-relation of self leadership and self job-satisfaction is .406 point, a meaning probability is .000 point and they seem to have a close interrelation. Rehearsal among factors of self leadership has the most interrelation with payment of self job-satisfaction. A professional position of self job-satisfaction has the most interrelation with self expectation(r= .314, p= .000). A job demand has the most interrelation with constructive thinking(r= .272, p= .001). A interaction has the most interrelation with self expectation(r= .272. p= .000). A administration has the most interrelation with constructive thinking(r= .411, p= .000). An interrelation between doctors and nurses has the most interrelation with self expectation(r= .385, p= .000). Our study shows there is a close relation between self leadership and job-satisfaction. Especially, self expectation and constructive thinking, the factor of self leadership, appear to affect the nurse's job-satisfaction. It appears that nurses feel to have a intensive job-satisfaction, having positive self leadership, a sense of purpose, and constructive thought. Thus, we need to steadily study self leadership, self control, and internal motivation as a new paradigm focused on self-control and internal motivation for their self-developments and advancement of nurses' organizations.

      • 대학생의 암 예방 수칙에 대한 인식 및 실천행태 연구

        곽지연,김서연,김자영,이혜연,정문정,진수현,천선우,하소현,한희진,양숙자,김지연 이화여자대학교 간호과학대학 2016 이화간호학회지 Vol.- No.50

        Purpose: The purpose of this study was to identify college student's perception and practice of 'National Cancer Prevention Actions' and the factors that influence the perception and practice. Method: The participants were 310 undergraduates selected by convenience sampling at colleges in Seoul. Instrument was 2014 Survey of Perception and Practice of National Cancer Prevention Actions by National Cancer Center(2014), and has been modified for the purpose of the study. The data were analyzed by t-test, ANOVA and Scheffe test with SPSS 23.0 Windows software. Results: The most recognized action for cancer prevention in college students was "Do not smoke, also avoid smoking smoke"(96.8%) while the most unrecognized was "Get a type B hepatitis vaccination"(58.7%). The most practiced action for cancer prevention in college students was "Sexually as to safe sex"(94.8%) while the most unpracticed was "Exercise five times a week or more, for at least 30 minutes a day"(33.9%). Among general characteristics, participants' age (t=-2.015, p<.05), major (F=3.109, p<.001), and residential type (F=4.959, p<.01) were statistically significant in the recognition of Cancer Prevention Actions and major(F=3.341 p<.05) and residential type(F=3.827, p<.05) were also significant in the practice of Cancer Prevention Actions. Among health characteristics, health concern(F=3.154, p<.05) and education in cancer(t=-3.112, p<.01) showed statistically significant differences in the recognition of Cancer Prevention Actions while health concern(F=7.896 p<.001) and subjective health status(F=9.913, p<.001) showed differences in the practice of Cancer Prevention Actions. Conclusion: These findings showed the gap between the perception and practice of cancer prevention actions. Considering the importance of individual characteristics, it is essential to develop a differentiated cancer prevention education program for college students. Also, nursing intervention program should be developed to raise the alertness of cancer in order to enhance cancer preventive practice.

      • Lactoferrin causes IgA and IgG2b isotype switching through betaglycan binding and activation of canonical TGF-β signaling

        Jang, Y-S,Seo, G-Y,Lee, J-M,Seo, H-Y,Han, H-J,Kim, S-J,Jin, B-R,Kim, H-J,Park, S-R,Rhee, K-J,Kim, W-S,Kim, P-H Society for Mucosal Immunology 2015 Mucosal immunology Vol.8 No.4

        <P>Lactoferrin (LF), a pleiotropic iron-binding glycoprotein, is known to modulate the humoral immune response. However, its exact role in Ig synthesis has yet to be elucidated. In this study, we investigated the effect of LF on Ig production by mouse B cells and its underlying mechanisms. LF, like transforming growth factor (TGF)-beta 1, stimulated B cells to produce IgA and IgG2b, while downregulating other isotypes. Using limiting dilution analysis, LF was shown to increase the frequency of IgA-secreting B-cell clones. This was paralleled by an increase in Ig germ-line alpha (GL alpha) transcripts, indicating that LF plays a role as an IgA switch factor. Interestingly, LF directly interacted with betaglycan (TGF-beta receptor III, T beta RIII) and in turn induced phosphorylation of T beta RI and Smad3 through formation of the T beta RIII/T beta RII/T beta RI complex, leading to IgA isotype switching. Peroral administration of LF increased intestinal/serum IgA production as well as number of IgA plasma cells in lamina propria. Finally, we found that LF has an adjuvant activity when nontoxigenic Salmonella typhimurium was inoculated perorally, conferring protection against intragastrical infection of toxigenic S. typhimurium. These results suggest that LF has an important effect on the mucosal/systemic IgA response and can contribute to protection against intestinal pathogens.</P>

      연관 검색어 추천

      이 검색어로 많이 본 자료

      활용도 높은 자료

      해외이동버튼