http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
이청복,최수정,안재홍,류대식,박만수,정승문,신동락 대한영상의학회 2014 Korean Journal of Radiology Vol.15 No.6
Objective: To evaluate magnetic resonance imaging (MRI) observer variability to detect ectopic insertion of the pectoralis minor tendon (EIPMT) and to investigate changes in the rotator interval in patients with EIPMT using MRI. Materials and Methods: A total of 507 shoulder MRIs (male:female = 259:248; mean age, 55.4 years) were classified into 1) normal type insertion of the pectoralis minor tendon, 2) complete type EIPMT, and 3) partial type EIPMT independently by two radiologists. Inter-observer agreement was calculated using the kappa coefficient. Thickness of the fibrotic scar tissue in the subcoracoid triangle and humeral side axillary recess was measured. MRIs were reviewed by consensus with regard to the grade of fibrotic scar tissue proliferation in the rotator interval. Comparisons were made between normal and EIPMT and between partial and complete type EIPMT. Results: The incidence of EIPMT was 13.4% (complete type, 7.7%; partial type, 5.7%). Inter-observer agreement was substantial (κ = 0.775). Fibrotic scar tissue in the subcoracoid triangle was thicker, and the grade of fibrotic scar tissue proliferation in the rotator interval was higher in the EIPMT group than those in the control group. No significant difference was observed in the thickness of humeral side axillary recess. The thicknesses of fibrotic scar tissue in the subcoracoid triangle and humeral side axillary recess as well as the grade of fibrotic scar tissue in the rotator interval were not significantly different between complete and partial type EIPMT. Conclusion: MRI enabled detection of EIPMT with substantial observer agreement. Patients with EIPMT show a high tendency for fibrotic scar tissue proliferation in the rotator interval.
T-50과 KUH 비행시험을 위한 계측 센서 적용 사례 연구
김남진,강경우,이청락,이주하 한국항공우주학회 2013 한국항공우주학회 학술발표회 논문집 Vol.2013 No.4
본 논문에서는 T-50 과 KUH 비행 시험을 위해 적용된 센서의 종류와 선정 방법을 기술하였으며, 항공기 개발 과정에서 발생한 불량으로 인하여 추가적으로 소요된 센서와 그 원인을 분석하여 향후 항공기 개발 사업 시 계측요구도 대비 계측센서의 여유분을 예측하고 확보함으로써 항공기 개발 비행시험이 적기에 완료 될 수 있는 근거 자료를 제시하였다. This paper described sensors type and sensor selection method used for the flight test of T-50 and KUH. During the aircraft development lots of unexpected failures were occurred. This paper analyze the cause of failure and why more sensors was purchased additionally then give the baseline on the plan of instrumentation sensor for new aircraft development in future.
염수환경에 의한 UPN139 탄소/에폭시 복합재 물성치 변화 연구
김중진(Joong-Jin Kim),문철진(Cheol-Jin Moon),허성화(Seong-Hwa Hur),이청락(Cheng-Rak Lee),권진회(Jin-Hwe Kweon),최진호(Jin-Ho Choi) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.10
Experiments were performed to investigate the effect of salt water on the mechanical properties of UPN-139 carbon-epoxy composite after 0, 1, 3, 6, 9 and 12 months immersion in 3.5% salt water. Waterproof painting and sealing tape were applied to protect the water absorption on the both cutting sides and taps of specimens. Test results show that while the tensile properties in fiber and matrix direction did not decrease considerably until 12 months of immersion, shear strength and modulus decreased gradually from nine months of the immersion. The reduction of shear strength and modulus were 9.5% and 10.8% of the values of dry specimens without exposure to salt water, respectively .