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기획논문 : 한국-독일 학교 교사 인식에 기초한 소통중심 미래교육 탐색
김현철 ( Hyun Chul Kim ),정진헌 ( Jin Heon Jung ) 한국교육철학회 2015 교육철학 Vol.56 No.-
This study examines classroom cultures of German and South Korean secondary schools in comparative perspectives. It aims to retrospect current education systems in the context of local specificities, and contribute to the present discussions on future education. We analyze survey results that are collected from German and Korean teachers respectively. The questionnaire includes questions about such themes as communication, talented people, and future education. The similarities and differences in each category are interpreted in cultural relativist perspective that appreciates different historical and cultural contexts of each country. Eventually, this article introduces the ‘desk group’ system that constitutes and sustains the essential philosophical ideas of the German school. It is argued that communication is key content and method by which the desk group is operated among not only students in classroom but also teachers and parents to achieve both individual oriented learning and teamwork experiences constituting a sustainable classroom culture.
3.0T MR system에서 TOF-MRA의 유체속도와 신호소실의 정량분석 : 유속조절팬텀 이용
백상훈(Sang-Hoon Back),정진헌(Jin-Heon Jeong),이예은(Ye-Eun Lee),곽민영(Min-Young Gwak),윤준(Jun Yoon),정다빈(Dabin Jung),오현식(Hyun-Sik Oh),허영철(Yeong-Cheol Heo) 한국방사선학회 2020 한국방사선학회 논문지 Vol.14 No.7
본 연구의 목적은 TOF-MRA에서 유체속도의 변화와 신호소실의 상관성을 정량적으로 분석하고자 하였다. 유체속도를 제어할 수 있는 팬텀을 자체 제작하여 유체속도를 8.0 ~ 127.3 mc/s까지 총 16단계로 변화시켰다. 3.0T MRI장치를 이용하여 TOF-MRA검사를 하였고 신호소실의 길이와 영상을 유입부, 중간부, 유출부로 분류하여 각 신호강도를 측정하였다. 신호소실의 길이는 유체속도가 127.3 cm/s였을 때 가장 길게 측정되었고 신호강도는 유체속도가 증가할수록 감소하였다(p<0.05). 유입부(-.547)와 중간부(-.643)는 유체의 속도가 증가할수록 음의 상관성이 있었다(p<0.05). 결론적으로 유체속도의 증가는 TOF-MRA에서 신호소실을 야기하는 주요한 인자였음을 확인하였다. 추후 혈류속도가 빠른 모델에서 신호소실을 줄이는 시퀀스 및 파라메터를 연구할 때 본 연구가 기초자료를 제공할 것이라 사료된다. The purpose of this study was to quantitatively correlate the change of flow velocity and signal voiding in TOF-MRA. We made our phantom to control the flow velocity, and changed the flow velocity in 16 steps from 8.0 to 127.3 mc/s. The TOF-MRA test was performed using a 3.0T MRI system and the signal intensity was measured by classifying the signal voiding length and image into the In flow, Mid flow, and Out flow. The length of signal voiding was the longest when the flow velocity was 127.3 cm/s and the signal intensity decreased with increasing flow velocity(p<0.05). In flow(-.547) and Mid flow(-.643) were negatively correlated with flow velocitys(p<0.05). In conclusion, it was confirmed that the increase in flow velocity was a major factor causing signal voiding in TOF-MRA. In the future, this study will provide basic data when studying sequences and parameters to reduce signal voiding in models with a high flow velocity.