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피부의 양성 및 악성 혈관종양에서 CD34표현에 관한 연구
백용관 ( Yong Kwan Baik ),민형근 ( Hyung Geun Min ),이호균 ( Ho Gyun Lee ),김종민 ( Jong Min Kim ),손진희 ( Jin Hee Sohn ) 대한피부과학회 1998 大韓皮膚科學會誌 Vol.36 No.5
Background: CD34 is a 115 kD glycoprotein which is expressed on hematopoietic progenitor cells. It is also known as an immunohistochemical marker of endothelial cells. Objective : This study was designed to investigate the patterns of CD34 expression on: (1) cutaneous benign and malignant vascular tumors and (2) on the mature and immature vessels of pyogenic grauloma and capillary hemangioma. Method: We performed immunoperoxidase staining using a monoclonal anti-CD34 antibody (QBEND/10) on formalin fixed, paraffin-embedded sections of 23 benign and malignant cutaneous vascular tumors. Results : The results are summerized as follows: 1. In 3 cases of nevus flammeus and 6 cases of carvernous hemangioma, vascular endothelial cells of all hemangiomas showed CD34 expressions. In 5 cases of angiokeratoma, endothelial cells of hemangioma, did not express CD34. 2. In all 5 cases of pyogenic granulomas and one case of capillary hemangioma, endothelial cells of mature vessels, endothelial cells near the well-formed lumina and endothelial cells showing intracellular lumina showed strong positivity for CD34, wbile endothelial cells far from the lumina and endothelial cells without lumina formation mostly showed negative staining for CD34. 3. One cese of Kaposis sarcoma showed focall positivity for CD34 both in endothelial cells of the small, well-formed vessels and spindle cells. Two cases of angiosarcoma showed CD34 expression only in endothelial cells of well-formed, normal appearing vessels, whereas atypical endothelial cells of tumor vessels and spindle cells were negative for CD34. Conclusion : CD34 could be a marker for endothelium in mature, well-differentiated vascular structures and may serve as a marker of lumen formation or differentiation of endothelial cells. (Korean J Dermatol 1998;36(5): 759-764)
원자력 발전소 시설에 있어서 콘크리트의 건조밀도 평가에 관한 연구
최경철 ( Gyeong Choel Choe ),김규용 ( Gyu Yong Kim ),남정수 ( Jeong Soo Nam ),임창혁 ( Chang Hyuck Lim ),신경수 ( Kyoung Su Shin ),백용관 ( Yong Kwan Baik ) 한국건축시공학회 2010 한국건축시공학회 학술발표대회 논문집 Vol.10 No.2
The facilities producing the nuclear energy chosen for resolving the recent global energy problem have been increasingly constructed, and hence more frequent durability tests on radiation shielding concrete are required due to NPP(Nuclear Power Plant) life extension and increase of radioactive waste repositories. Bulk dry density is one of the critical factors ensuring the durability and performance of the radiation shielding concrete because the design of the radiation shielding reinforced concrete structures for NPPs is based on the bulk dry density of the concrete. Bulk density of unconsolidated shielding concrete can be calculated utilizing a test assuring to satisfy the bulk dry density, or existing credible data set. This study evaluated correlation between bulk density and bulk dry density of the concrete used for Korean NPPs (y=0.9534X+0.0714) and developed a correlation expression considering standard deviation of bulk dry density (y=0.9534X-0.0156).