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조정연 충남대학교 기초과학연구소 2005 忠南科學硏究誌 Vol.32 No.1
Turbulence is the most common state of astrophysical flows. In typical astrophysical fluids, turbulence is accompanied by strong magnetic fields, which has a large impact on the dynamics of the turbulent cascade. Recently, there has been a significant breakthrough on the theory of magnetohydrodynamic(MHD) turbulence. For the first time we have a scaling model that is supported by both observations and numerical simulations. We review recent progress in studies of incompressible MHD turbulence. We discuss Goldreich-Sridhar model of Alfvenic MHD turbulence, which is characterized by Kolmogorov spectrum and scale-dependent anisotropy. We describe our numerical calculations that confirmed Goldreich-Sridhar model and briefly discuss other types of MHD turbulence that are astrophysically important.
초고층 주상복합건물에서 「층·향·조망」 요인의 가치인식에 관한 연구
조정연,강미선 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(계획계)
The purpose of this study to analyze the residents' preference and value-cognizance about the floor, direction, and view in the High-Rise Composition Apartments. As a result, there was big value-weight about the direction and view. The preference for floor was divided by complex classifications. The value-weight for direction was high still, and the preference of southern direction was superior. And many people thought that the nature view was more valuable than the artificial view.
肛腸瘠법에 의한 玉屛風散加味의 卽刻型알레르기 반응 억제 효과
조정연,문구,문석재,원진희,유경태,이종덕 대한동의생리학회,대한동의병리학회 2002 동의생리병리학회지 Vol.16 No.2
Okbyungpoongsan-Gami (OG) has been used for the treatment of excessive sweating with general weakness and allergic rhinitis recently. Anal therapy is another way of taking Oriental medicine. It is an important pathway but not available in common clinical situation. This experiment was performed in order to study the inhibitory effect of immediate-type allergic reaction of OG by anal therapy. In addition, the experiment was practised by 1H-NMR spectroscopy to examine molecular structure of OG. The results were obtained as follows : OG concentration-dependently inhibited compound 48/80- induced immediate type systemic allergic reaction with concentrations of 0.01-1.0g/kg by anal administration 1h before injection of compound 48/80. OG also concentration-dependently inhibited compound 48/80- induced ear swelling response with concentrations of 0.01-1g/kg by anal administration 1h before injection of compound 48/80. OG also inhibited the passive cutaneous anaphylaxis activated by anti-dinitrophenyl (DNP) lgE antibody concentration-dependently at concentrations ranging from 0.01 to 1g/kg. When OG was pretreated at concentrations ranging from 0.01 to 1g/ℓ, the histamine release from the rat peritoneal mast cells induced by compound 48/80 was reduced in a concentration-dependent manner. OG (0.1-1g/ℓ) had a significant inhibitory effect on histamine release from lgE-induced activated mast cells. OG is seen to be a biochemical compound certainly by 1H-NMR spectroscopy According to above results, anal therapy of OG may be beneficial in the treatment of systemic and local immediate-type allergic reactions by inhibition of histamine release from mast cells.
이동형 구내 방사선촬영기로 촬영한 치근단 방사선사진의 흡수선량 및 유효선량 평가
조정연,한원정,김은경 대한구강악안면방사선학회 2007 Imaging Science in Dentistry Vol.37 No.3
Purpose : The purpose of this study was to measure the absorbed dose and to calculate the effective dose for periapical radiography done by portable intraoral x-ray machines. Materials and Methods : 14 full mouth, upper posterior and lower posterior periapical radiographs were taken by wall-type 1 and portable type 3 intraoral x-ray machines. Thermoluminescent dosemeters were placed at 23 sites at the layers of the tissue-equivalent ART woman phantom for dosimetry. Average tissue absorbed dose and radiation weighted dose were calculated for each major anatomical site. Effective dose was calculated using 2005 ICRP tissue weighted factors. Results : On 14 full mouth periapical radiographs, the effective dose for wall-type x-ray machine was 30 Sv; for portable x-ray machines were 30 Sv, 22 Sv, 36 Sv. On upper posterior radiograph, the effective dose for wall-type x-ray machine was 4 Sv; for portable x-ray machines doses were 4 Sv, 3 Sv, 5 Sv. On lower posterior radiograph, the effective dose for wall type x-ray machine was 5 Sv; for portable x-ray machines doses were 4 Sv, 4 Sv, 5 Sv. Conclusion : Effective doses for periapical radiographs performed by portable intraoral x-ray machines were similar to doses for periapical radiographs taken by wall type intraoral x-ray machines.
조정연,현정준,Jo, Jeong-Yeon,Hyeon, Jeong-Jun 한국천문학회 1991 天文學論叢 Vol.6 No.1
두 스칼라장 $\phi_1$, $\phi_2$를 사용한 원시 검은 구멍 생성모형을 살펴보았다. $\phi_1$은 Linde의 혼돈 인플레이션장을, 그리고 $\phi_2$는 SU(5) 대통일 이론의 Higgs장을 사용하였다. 인플레이션은 $\phi_1$에 의해서 일어난다고 가정하였는데, 재가열(reheating) 온도가 $\phi_2$장의 임계온도(${\sim}1.31{\times}10^{14}GeV$)보다 높을 경우 재가열 직후에 검은 구멍이 생성됨을 알 수 있었다. 재가열 온도가 $1.48{\times}10^{14}GeV$정도 되면, 질량이 1kg쯤인 검은 구멍이 생성되는데, 현재의 지평선에 해당되는 당시의 영역 내에서 생성되었던 검은 구멍들의 총 질량이 ${\sim}10^{55}g$($\approx$현재 우주의 지평선 질량)이 되어, 그 증발과정이 우주론적으로 중요해질 수 있다.