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이현성(Hyun Seong Lee),승명균(Myung Kyun Sung),김흥수(Heung Soo Kim) 대한기계학회 2017 大韓機械學會論文集A Vol.41 No.4
본 논문에서는 고무 부싱의 등가 강성이 가진 크기와 가진 주파수에 따라 달라지는 동특성에 대해 연구하였다. 새로운 모델은 고부 부싱의 대변형 거동과 크기 효과를 설명하기 위해 제안하였다. 제안된 제안된 모델은 탄성(Elastic) 요소, 점성(Viscous) 요소, 마찰(Friction) 요소로 이루어진 응력항과 등가변형률로 구성되어 있다. 제안된 모델은 실험 결과를 통해 검증하였다. 실험 검증을 통해 제안된 모델은 다양한 가진 크기와 가진 주파수에 따른 고무 부싱의 등가 강성을 정확히 예측함을 확인할 수 있다. 제안된 모델은 자동차 산업에서 고무 부싱의 동적 등가강성을 예측하는데 사용할 수 있을 것으로 예상한다. In this paper, the amplitude and frequency dependent dynamic characteristics of the equivalent stiffness of a rubber bushing are investigated. A new mathematical model is proposed to explain the large deformation and size effect of a rubber bushing. The proposed model consists of elastic, viscous, and frictional stress components and the equivalent strain. The proposed model is verified using experimental results. The comparison shows that the proposed model can accurately predict the equivalent stiffness values of a rubber bushing under various magnitudes and frequencies. The developed model could be used to predict the dynamic equivalent stiffness of a rubber bushing in automotive engineering.
29세 남자에서 다발성 낭종성 병변으로 진행한 폐선암 1예
이현성 ( Hyun Seong Lee ),전재완 ( Jae Wan Jeon ),김재희 ( Jae Hee Kim ),주형욱 ( Hyeong Uk Ju ),배중기 ( Joong Gi Bae ),민영주 ( Young Ju Min ),안종준 ( Jong Joon Ahn ),서광원 ( Kwang Won Seo ),제갈양진 ( Yangjin Jegal ),권운정 ( 대한결핵 및 호흡기학회 2012 Tuberculosis and Respiratory Diseases Vol.72 No.2
Cystic lesions or progressive cystic changes in adenocarcinoma of the lung have rarely been reported. We report a case of lung adenocarcinoma that progressed from ground-glass opacities (GGOs) and consolidations or nodules to extensive cystic lesions during 12 months in a young adult patient. A 29-year-old male was initially diagnosed with primary lung adenocarcinoma by transbronchial lung biopsy of the right lower lobe and lung to lung metastasis in both lungs according to imaging findings. The initial chest computed tomography (CT) scans showed multifocal GGOs, consolidations, and nodules in both lungs. Despite treatment with palliative chemotherapy, the patient`s follow-up CT scans showed multiple, cystic changes in both lungs and that the lesions had progressed more extensively. He died of hypoxic respiratory failure one year after his diagnosis.
MDCT을 이용한 Cardica CT 검사에서 ECG-pulsing기능의 사용 경험 및 고찰
박현(Hyeok Park),이현성(Hyun Seong Lee),김태성(Tae Seong Kim),안인현(In Hyun An),최남길(Nam Kil Choi) 대한CT영상기술학회 2008 대한CT영상기술학회지 Vol.10 No.1
Purpose Cardiac CT comparing with other region’s same scan range very much radiation dose. so, I wanted to know the method which can reduce radiation dose through the effective methode of ECG-pulsing method. Materials and Methods I performed the test of patients which were prescribed for Cardiac CT because of chest pain, etc. I measured patients’ heart rate before the test. When their heart rate was more than 65 times, I used the ‘B-Blocker and I analyzed the use probability and success rates of ECG-pulsing, DPL and the optimum image reconstruction data. Results Among the 200 patients, I used the ECG-pulsing in 136 cases (68%) and DPL (mSv-cm) value was from 513 to 836 (mean value : 649). Ca scoring was from 44 times to 65 times (the mean : 57 times) in HR and from 36 times to 69 times (the mean : 53 times) in CTA. I didn’t use the ECG-pulsing in 62 cases (32%). DPL (mSv-cm) value was from 922 to 1320 and mean value was 1074. Ca scoring was from 53 times to 90 times (the mean : 66 times) in HR and from 38 times to 73 times (the mean : 59 times) in CTA. I didn’t the ECG-pulsing method because when I got the Ca scoring data, mostly BPM’s maximum was more than 64 (46cases, 73%). Image reconstruction R-R interval was shown from 65% to 69%. Conclusion When I used the ECG-pulsing method, DPL dose decreased by 39.6% than I didn’t use that. With the recent development of CT equipment, I recommend much use of the ECG-pulsing method because I think that the use of ECG-pulsing method has radiation dose decreased without a drop in image quality through the supplement of diverse ECG-pulsing methods and the maximum use of ECG-pulsing in fast CT.