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커먼레일식 디젤 인젝터의 충돌 분무에 대한 실험적 연구 (2) -미립화 특성-
이창식 ( Lee Chang Sig ),박성욱 ( Park Seong Ug ),서상헌 ( Seo Sang Heon ) 한국분무공학회 2003 한국액체미립화학회지 Vol.8 No.3
N/A In this study, the experimental study on atomization characteristics of the fuel spray impinging on the wall was performed at different wall distances and angles for wall inclination. The fuel injection system was composed on the common-rail system, and the injection signal was synchronized by the delay generator. The atomization characteristics of the injected spray were analyzed in terms of the SMD and velocities which were measured by using the phase Doppler particle analyzer system. It is revealed that the free spray is atomized actively above 50㎜ form the infector trip. In the cases of the impinged spray, the SMD and velocity of the impinged spray are smaller than those of the free spray. The impinged spray has the maximum velocity near the 35㎜ of the radial distance from the injector axis, and the atomization performance is enhanced with the decrease of the wall distance.
모기질종(Pilomatricoma)의 분화과정에 따른 cytokeratin과 Ki-67의 발현 양상
최윤덕 ( Choe Yun Deog ),박진남 ( Park Jin Nam ),강미선 ( Kang Mi Seon ),조시형 ( Jo Si Hyeong ),박성욱 ( Park Seong Ug ) 대한피부과학회 2003 大韓皮膚科學會誌 Vol.41 No.12
N/A Background: Pilomatricoma (PM) is benign follicular tumor composed of the basophilic cells, transitional cells, shadow cells, squamoid cells and keratin filaments/amorphous debris. At present, PM is assumed to differentiate toward hair-forming cells of hair follicles but definite direction is not clear. Objectives: This study was made in order to investigate the pathways of cell differentiation associated with sudden keratinization in PM. Methods: In the present study, 19 cases of human PM was histopathologically examined and classified into 4 groups according to the chronological stages. Results: In the chronological stages according to Kaddu`s classification, there were 2 cases of early lesion, 6 cases of fully developed lesion, 7 cases of early regressive lesion and 4 cases of late regressive lesion. The basophilic cells changed into the shadow cells or amorphous debris through the transitional cells moving toward the exterior of the PM, as well as toward the interior. As Kera-tinization occurs, some inner basophilic cells which had been located in marginal areas of keratini-zation lost their tight cell-cell bonding. These cells showed edematous/vesicular and squamoid chan-ges. High molecular weight cytokeratin was expressed in a linear pattern in some early and fully developed lesions. There were fewer layers of basophilic cells between the stroma and squamoid cells/amorphous debris than between the stroma and shadow cells. Ki-67 was expressed strongly both basal and overlying basophilic cells. Apoptotic bodies were detected in most transitional celly layers and some amorphous debris zones. Conclusions: The present study suggests dual pathways of cell differentiation in PM_s. In the sudden keratinization pathway, the basophilic cells, transtional cells, shadow cells, and squamoid cells are suddenly keratinized, and the basophilic cells become early the transitional cells or squamoid cells. Cytoplasmic expressions of Ki-67 and cytokeratin in the basophilic cells show that the baso-philic cells differentiate toward the innermost layer of the outer root sheath cells. (Korean J Dermatol 2003;41(12):1619~1626)