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Effects of Light Curing Distance on the Polymerization of Composite Resins
조호성,윤동인,박미경,김종화,설효정,김형일,권용훈 대한치과재료학회 2010 대한치과재료학회지 Vol.37 No.4
본 연구는 광조사기의 light‐guide와 시료 사이의 거리가 복합레진의 미세경도에 미치는 영향을 평가한 것이다. 이를 위하여 시료와 light‐guide 사이의 거리를 0, 3, 6 mm로 하였다. 본 연구를 위하여 2종의 복합레진 (Ceram X, Z250)을 택하였고 광원으로 3종의 광조사기를 택하였다. Optical multichannel analyzer를 이용하여 두께가 각각 1, 2, 3 mm이고 시료와light‐guide 사이의 거리가 각각 0, 3, 6 mm인 상황에서 시료를 통과하는 광량을 측정하였다. 시료의 표면과 바닥면에서의경도를 측정하기 위하여 Vickers hardness tester를 이용하였다. 경도측정을 위하여 200‐gf의 하중이 10초 동안 지속되도록하였다. 동일한 조건에서 시료의 중합수축을 광조사 동안과 광조사 후에 측정하였다. 그 결과 광량은 시료가 없을 경우에는시료와 light‐guide 사이의 거리가 증가할수록 선형적으로 감소하였고 시료가 있을 경우에는 지수적으로 감소하였다. 미세경도는 시료와 light‐guide 사이의 거리가 0일 때 Ceram X 에서는 표면과 바닥면의 차이가 7.5~17.7% 이었고 Z250에서는5.6~13.3% 이었다. 또한 시료와 light‐guide 사이의 거리가 6 mm일 때 Ceram X에서는 표면과 바닥면의 차이가 33.2~42.8%이었고 Z250에서는 22.9~31.7% 이었다. 중합수축은 레진시료와 광조사기에 따라서 시료와 light‐guide 사이의 거리가 0일때 17.0~18.3 μm이었고 6 mm일 때 15.4~16.6 μm이었다. 중합에 의한 순수한 온도상승은 시료와 light‐guide 사이의 거리가 0일 때는 4.2~5.9℃ 이었고 6 mm일 때는 6.5~8.8℃ 이었다.
랫드 전암 간세포의 증식성과 c-myc, ras의 발현에 관한 연구
조호성,박남용,Cho, Ho-seong,Park, Nam-yong 대한수의학회 2000 大韓獸醫學會誌 Vol.40 No.1
This study was carried out to examine proliferative activity and expression of c-myc oncoprotein and p2lras in normal and preneoplastic rat livers induced by an in vivo mid-term chemical carcinogenesis assay. Sixty, six-week-old male specific pathogen free Sprague-Dawley male rats were randomly divided into five groups. Group I was received a single intraperitoneal(IP) dose(200mg/kg) of diethylnitrosamine(DEN). Group 2(10 rats) was operated partial hepatectomy(PH) and Group 3 was received IP(200mg/kg) DEN, fed two weeks later with 500ppm of phenobarbital(PB). Group 4 was received IP(200mg/kg) DEN, fed two weeks later 500ppm(PB) and PH at week 3 after the onset of experiment. While group 5(20 rats) was not treated and used as a control group. All the rats were sacrificed at age 14 weeks except 10 rats from group 5 were sacrificed at the onset of experiment. Livers of all rats were examined for 5-bromo-2'-deoxyuridine(BrdU) incoporation, proliferating cell nuclear antigen(PCNA), silver-binding nucleolar organizer regions(AgNORs) counts per nucleus and expression of c-myc oncoprotein and p21ras. Both the number and area of the preneoplastic lesions were significantly(p<0.01) compared to other groups. A significant(p<0.01) increase in immunoreactive cells were detected in preneoplastic hepatocytes in Groups 3 and 4 by PCNA and BrdU immunohistochemical stain. The number of the positive cells were significantly(p<0.05) lower in normal 14-week-old rats than those of 6-week-old rats. The results showed that proliferative activity of the hepatocytes was increased by treatment with DEN, PH and PB. Meanwhile, AgNORs counts per nucleus were significantly(p<0.05) increased in the preneoplastic hepatocytes of rats in both groups 3 and 4. The expression of c-myc oncoprotein and p21ras were more readily localized within the hepatic preneoplastic lesions such as hyperplastic nodules. Especially, group 4 showed significantly (p<0.05) overexpressed levels compared to groups 1 and 3. These findings suggest that PCNA, BrdU and AgNORs are significantly increased and c-myc oncoprotein and p21ras are significantly overexpressed in hepatic preneoplastic lesions induced by mid-term carcinogenesis. So these parameters can be an effective markers for hepatic prencoplastic lesions.
검은 꼬리 프레리 독(Cynomys ludovicianus)의 편모충증
조호성,김영섭,정영목,승원우,박남용 한국임상수의학회 2005 한국임상수의학회지 Vol.22 No.4
Five black-tailed prairie dogs showed weakness. emaciation and anemia during the lairage period in May 2005. Among them, one adult male and one female prairie dogs were found dead. The stamp smear for revealed a tremendous number of Giardia trophozoites. Histopathological examinations of the intestine showed slightly inflammatory changes and cystic enlargement of the crypts in the duodenal and jejunal mucous membranes. From these findings, this disease was diagnosed as giardiasis in black-tailed prairie dog.
응력완화 1.3$\mu$m GaInAsP/InP uncooled-LD의 다중양자우물층과 SCH층 구조에 따른 동작 특성
조호성,박경현,이정기,장동훈,김정수,박기성,박철순,김홍만,편광의 대한전자공학회 1996 전자공학회논문지-A Vol.33 No.7
We have adopted the strain compensated PBH(planar buried heterostructure) - LD in which the MQW active layer consisted of 1.4% compressively strained GainAsP (E$_{g}$ = 0.905eV) wells and 0.7% tensile strained GaInAsP(E$_{g}$ = 1.107eV) barriers grown by metal organic vapor phase epitaxy (MOVPE). We hav einvestigated effects of number of wells and the structure of the separate confinement heterostructure (SCH) layer in the strain-compensated MQW-PBH-LD. The threshold current, the external quantum efficiency, the transparency current density J$_{o}$, and the gain constant .beta. have been evaluated for uncoated MQW-PBH-LD. As the number of wells increases, the internal quantum efficiency and the transparency current density decreases, whereas the gain contant increases. The small width of the SCH layer shows the large internal quantum efficiency. The small internal loss and the large gain constant have been obtained by inserting the large bandgap SCH layer.
사골동염에 동반된 안와봉와직염 및 대뇌염(cerebritis) 1례 : A Report of One Case
조호성,김흥동,정철영 인제대학교 1993 仁濟醫學 Vol.14 No.2
사골동염의 합병증으로 동반된 안와봉와직염 및 대뇌염(cerebritis) 1례를 치험하였기에 문헌고찰과 함께 보고하는 바이다. Acute ethmoiditis is often complicated from upper respiratory infection. Orbital and intracranial complications can occur because of the close anatomical relationships among the paranasal sinuses, orbit and the brain. We experienced a case of cerebritis in 12 years old male child with orbital cellulitis and ethmoiditis. EEG revealed localized slow waves on left frontal area, and MRI showed high signal intensity on same region. This patient was treated with intravenous infusion of cefotaxime and gentamicin for 4 weeks, and recovered completely. We report a case of cerebritis with a review of literatures.