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배종엽,최진섭,정현철,박찬일,박영년 대한병리학회 2003 Journal of Pathology and Translational Medicine Vol.37 No.1
Background : Matrix metalloproteinase (MMP)-2 and MMP-9 degrade type IV collagen and are antagonized by the tissue inhibitors of metalloproteinase (TIMP)-2 and TIMP-1, respectively. Methods : We studied by immunohistochemistry the expressions of MMP-2, MMP-9, TIMP- 1 and TIMP-2 in 72 cases of adenocarcinoma of the gallbladder. Results : The MMP-2, MMP-9 and TIMP-1 expressions were significantly higher in well/moderately differentiated adenocarcinomas than in poorly differentiated adenocarcinomas, in adenocarcinomas that had invaded the lamina propria/proper muscle than in those that had invaded the perimuscular connective tissue or beyond the serosa, and in adenocarcinomas with fungating growth than in those with infiltrative growth. The TIMP-2 expression showed a similar pattern without statistical significance. Regarding the status of lymph node metastasis, the MMP-2 expression was significantly higher in cases without lymph node metastasis. The MMP-2 and MMP-9 expressions were significantly related to those of TIMP-2 and TIMP-1, respectively, with regard to depth of invasion, differentiation, and growth patterns of the adenocarcinomas. Conclusions : MMP-2, MMP-9, TIMP-1 and TIMP-2 are suggested to play important roles in the progression to early invasion of adenocarcinomas, in which the function of MMP-2 is inhibited by TIMP-2.
세침흡인 세포검사에서 양성 질환을 닮은 폐의 고분화 샘편평 암종 - 1예 보고 -
배종엽,오훈규,박재복,Bae, Jong-Yup,Oh, Hoon-Kyu,Park, Jae-Bok The Korean Society for Cytopathology 2004 대한세포병리학회지 Vol.15 No.2
Fine needle aspiration (FNA) cytological examination is an appropriate method for the evaluation of pulmonary nodules. In major types of lung cancer, Its diagnostic accuracy is quite high. However, it is sometimes difficult, using this technique, to differentiate between some unusual phenotypes including adenosquamous carcinoma, bronchioloalveolar carcinoma (BAC), neuroendocrine tumor, mucoepidermoid carcinoma, and sclerosing hemangioma. Here, we present a case involving extremely well differentiated adenosquamous carcinoma, mimicking benign lesions, such as pulmonary scar and adenomatoid malformation with squamous metaplasia. The patient was a 68-year-old man presenting with a solitary pulmonary nodule$(1.6\times1.6cm)$, which was incidentally found at the periphery of the right lower lobe. FNA revealed some clusters of glandular cells with minimal atypia, in addition to squamous cells at a nearly full maturational state. Histological examination verified the cytological diagnosis on a lobectomy specimen. The tumor exhibited a well differentiated adenocarcinoma component, mimicking the bronchioles in scarred lung tissue. and a well differentiated squamous cell carcinoma component, mimucking the squamous cell nests of adenoacanthoma, in the other organs. In the present case, the possibility of adenosquamous carcinoma should have been considered if squamous cells were seen in the FNA from the peripheral pulmonary nodule, even though they appeared to be benign.
Tilting을 고려한 테이퍼롤러 베어링의 최적 크라우닝량 계산
배종엽(Jongyup Bae),이상돈(Sangdon Lee),도병권(Byoung-Kwon Doh),조용주(Yongjoo Cho) 한국트라이볼로지학회 2009 한국윤활학회지(윤활학회지) Vol.25 No.6
When a bearing roller is in contact with race ways. excessive pressure peaks occur at the ends of the contact region. They are called edge loading. In this study, a method to determinate crowning quantity of the tapered roller bearing which considers tilting. This method is based on contact analysis.
배종엽(Jongyup Bae),이상돈(Sangdon Lee),윤희동(Heedong Youn),조용주(Yongjoo Cho) 한국트라이볼로지학회 2008 한국트라이볼로지학회 학술대회 Vol.2008 No.6
In case of gas or the compressor of air, efficiency is extremely decreased by polluting the operational body of a interior equipment and wall panel if oil is used for the lubrication of a piston ring. Thus, a self lubrication-solid bearing material and a high-molecular complex material can be used as materials of a piston ring. In this research, JIG was manufactured to be similar to a real drive by applying reciprocation kinematic friction tester about diverse first gathering discriminated the component ration of a piston ring used in CNG charging VRA compressor. In addition, this research drew coefficient of friction through a friction test, and experiment on the judgement of material suitability and the comparison of superiority between materials with measuring wear quantity.
Tilting을 고려한 테이퍼롤러 베어링의 최적 크라우닝량 계산
배종엽(Jongyup Bae),이상돈(Sangdon Lee),도병권(Byoung-Kwon Doh),조용주(Yongjoo Cho) 한국트라이볼로지학회 2009 한국트라이볼로지학회 학술대회 Vol.2009 No.6
when a bearing roller is in contact with race ways. excessive pressure peaks occur at the ends of the contact region. They are called edge loading. In this study, a method to determinate crowning quantity of the tapered roller bearing which considers tilting. This method is based on contact analysis.