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압축천연가스자동차용 Type III 용기의 복합재 결함 평가
김영섭, 김래현, 양동주, Kim. Young-Seob, Kim. Lae-Hyun, Yang. Dong-Ju 한국에너지공학회 에너지공학 6 Pages
한국에너지공학회 에너지공학 2011, Vol.20 No.2 90-95 (6 pages)
연구는 압축천연가스자동차용 Type III 용기 복합재에 발생한 스크래치, 컷, 가우지 등의 손상을 평가하여 계속 사용여부를 판정하기 위해 수행하였다. 결함내구성 시험결과, 복합재의 손상등급에 따라 ISO 19078에서 정한 최소요구 반복회수(11,250회)는 모두 만족하였고 용기의 반복성능은 손상등급 1, 2에서는 20,000회를 상회하다가 손상등급 3에서는 18,000~21,000회의 범위를 나타내었다. 실험용기 12개 중 8개가 Type III 용기복합재 결함의 영향을 받아 파괴되었고 나머지는 결함과 관계없이 파괴된 것으로 판단된다. 전산모사에... -
Effects on G2/M Phase Cell Cycle Distribution and Aneuploidy Formation of Exposure to a 60 Hz Electromagnetic Field in Combination with Ionizing Radiation or Hydrogen Peroxide in L132 Nontumorigenic Human Lung Epithelial Cells
HeeJin, HyeEunYoon, Jae-SeonLee, Jae-KyungKim, SungHoMyung, Yun-SilLee 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 6 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2015, Vol.19 No.2 6 119-124 (6 pages)
on the type of cancer studied; moreover, methodological problems have been identified in some of th e studies [5,6]. Furthermore, one in vitro study found that a 50/60 Hz ELF-MF was un- able to induce mutations [7]. Therefore, it has been hy- pothesized that ELF-MFs might not directly induce DNA damage; rather, they may affect cellular responses in cells already damaged by ionizing radiation... The aim of the present study was to assess whether exposure to the combination of an extremely low frequency magnetic field (ELF-MF; 60 Hz, 1 mT or 2 mT) with a stress factor, such as ionizing radiation (IR) or H2O2, results in genomic instability in non-tumorigenic human lung epithelial L132 cells. To this end, the percentages of G2/M-arrested cells and aneuploid cells were examined. Exposure to 0.5 Gy IR or 0.05 mM H2O2 for 9 h resulted in the highest levels of aneuploidy; however, no cells... -
Heterogeneity of the SR-dependent Inward Na+-Ca2+ Exchange Current in the Heavily Ca2+-buffered Rat Ventricular Myocytes
Kyung-BongYoon, Sung-WanAhn, ChangMannKo 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 10 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2004, Vol.8 No.2 6 101-110 (10 pages)
L-type Ca 2+ channels during the action potential, which is known as the 'Ca 2+ -induced Ca 2+ release (CICR)' (Fabiato, 1983; Lopez-Lopez et al, 1995). Ca 2+ entered through other rout es such as the T-type Ca 2+ channel (Sipido et al, 1998; Zhou & January, 1998), the reverse-mode Na +-Ca 2+ exchange (NCX) (Leblanc & Hume, 1990; Sipido et al, 1997) and possibly Na + channels (Santana et al,... Voltage-sensitive release mechanism was pharmacologically dissected from the Ca2-induced Ca2 release in the SR Ca2 release in the rat ventricular myocytes patch-clamped in a whole-cell mode. SR Ca2 release process was monitored by using forward-mode Na-Ca2 exchange after restriction of the interactions between Ca2 from SR and Na-Ca2 exchange within micro-domains with heavy cytosolic Ca2 buffering with 10 mM BAPTA. During... -
Rapid Detection of SdhBP225F and SdhBH272R Mutations in Boscalid Resistant Botrytis cinerea Strains by ARMS-PCR
Xin Liu, Rong Zeng, Shigang Gao, Lihui Xu, Fuming Dai 한국식물병리학회 The Plant Pathology Journal 6 Pages
한국식물병리학회 The Plant Pathology Journal 2019, 35권 1호 8 71-76 (6 pages)
according to the sensitivity of conidial germination. Strain B7, B8 and B9 were wild- type strains, which are sensitive to boscalid. For the P225F detection, as shown in Fig. 1A and Fig. 2A, a 426 bp control fragment was successfully amplified for all tested strains as a positive control. As expected, this system pro- duces an amplification product of 330 bp for P225F mutant (B1, B2, B3), and... SdhBP225Fand SdhBH272R mutations have been found associated with boscalid resistance in Botrytis cinerea from strawberry in Shanghai, China. For rapid detection of two mutations, tetra-primers were designed and optimized to gain the relatively high accuracy and specificity based on the ARMS-PCR technique, by which resistance can be identified with different lengths of products on agarose gels. The tetra-primer ARMS-PCR systems for SdhBP225F and SdhBH272R were validated by 9 SdhB-squenced strains... -
To Be Conservative as a Disposition of Education: Familiarity, Freedom and Learning from the Perspective of Michael Oakeshott
Wen-Da, Kwon Jung-son, Kim Hoy-yong 부산대학교 교육발전연구소 교육혁신연구 36 Pages
부산대학교 교육발전연구소 교육혁신연구 2017, 제 27권 제 4호 15 309-344 (36 pages)
in an activity will disappear. ‘Vocational’ education, in this sense, is that in which relevant commercial skills are acquired; and within this type of education “a civilization has the naive appearance of the things known and the skills practised which are entailed in a current manner of living”(Oakeshott, 1991d: 191). In this sort of education the skills may be complicated and may have a... Purpose: The purpose of this study is chiefly to interpret and clarify a traditionally notion of the conservative disposition concealed in liberal education by reviewing three basic concepts?familiarity, freedom and learning? from the perspective of Michael Oakeshott. Method: Firstly, we discover that there are two intractable crises in education on account of the observation of history and current situations. The first relates to the sustainability of the conservative disposition and the second... -
소켓 용접부 결함 검사용 초음파 자동 검사 장비 개발
이정기, 박문호, 박기성, 이재호, 임성진, Lee. Jeong-Ki, Park. Moon-Ho, Park. Ki-Sung, Lee. Jae-Ho, Lim. Sung-Jin 한국비파괴검사학회 비파괴검사학회지 7 Pages
한국비파괴검사학회 비파괴검사학회지 2004, Vol.24 No.3 275-281 (7 pages)
ISA interface type으로 4축 제어용 motion controller를 개발하여 자동 검사를 수행하는 scanner를 제어하도록 하였으며, 검사 결과는 소켓용접부 단면을 실시간 영상으로 나타내도록 되어 있다. 인공결함 시험편의 결함을 평가한 결과 결함의 깊이가 1mm인 결함의 평가 길이는 실제 크기보다 작게 나타내고 있으며, 결함의 깊이가 증가할수록 결함의 길이가 더 크게 평가되었다. 본 연구로 개발한 장비는 원자력 발전소나 화학플랜트에 많이 널려 있는 소켓용접부 내의 용입불량, 피로 균열 등을 검출하여 객관적인 검사 결과를 제시할... -
표면결함유형이 초음파 후방산란 프로파일에 미치는 영향
권성덕, 윤석수, Kwon. Sung-D., Yoon. Seok-S. 한국비파괴검사학회 비파괴검사학회지 5 Pages
한국비파괴검사학회 비파괴검사학회지 2001, Vol.21 No.6 658-662 (5 pages)
후방산란된 초음파의 입사각 의존성을 이용한 표면 결함유형의 평가가 시도되었다. 평탄한 유리위에 순수한 홈, 구리로 채워진 홈, 표면위 붙여진 구리선등의 표면결함 시편에 대한 후방산란 프로파일은 제 1 임계각에서 종파의 산란과 관련된 새로운 프로파일을 보여주었다. 결함에 의한 산란효과가 클수록 후방프로파일들의 정점 위치는 작게 나타났으며 후방복사 프로파일과 정점 위치에서의 파열의 모양은 결함의 유형과 위치에 따라 누수파와 산란파의 복합적 요인에 의해 다른 형태를 보여주었다. -
용접부 결함 검출에 관한 실험적 연구
남궁재관 한국공작기계학회 한국공작기계학회논문집 8 Pages
한국공작기계학회 한국공작기계학회논문집 2003, Vol.12 No.6 56-63 (8 pages)
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A Study on Teaching English Across Proficiency Levels
Lee Hae-kyung 공주교육대학교 초등교육연구원 교육논총 18 Pages
공주교육대학교 초등교육연구원 교육논총 53권3호 9 1-18 (18 pages)
stage that you be very sensitive to students’ need to practice freely and openly without fear of being ..PAGE:7 A Studyon Teaching English AcrossProficiencyLevels - 7 - corrected at every minor flaw. On the other hand, you need to correct some selected grammatical and phonological errors so that students don’t fall into the trap of assuming that “no news is good news” (no correction implie... The purpose of this study is to analyze the concept of language proficiency and notice the difficulty of defining proficiency, especially in differentiating among what is commonly thought to be ‘beginning’, ‘intermediate’, and ‘advanced’ levels. We need to recognize methodological differences among teaching classes of beginning, intermediate and advanced students and apply concepts of accuracy, fluency, comprehensibility, grammaticality, and sociolinguistic appropriateness to an...