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홍영준,정해용,김순호,강민철,김인배 ( Young Jun Hong,Hae Young Jeong,Soon Ho Kim,Min Cheol Kang,In Bae Kim ) 한국주조공학회 1994 한국주조공학회지 Vol.14 No.4
N/A Effect of aging treatment on the microstructural evolution of a rapidly solidified Al-3.56wt%Li-0. 97wt%Mg alloy were investigated by differential scanning calorimetry(DSC) and transmission electron microscopy(TEM). DSC analysis showed two exothermic and two endothermic peaks. The two exothermic and endothermic peaks corresponded to δ′and δ+T precipitation and dissolution reactions respectively. The enthalpy of δ´precipitation decreased with increasing of aging temperature and time until the finishing point of precipitation. The activation energy for precipitation of δ´ was measured as 78KJ/㏖ and the energy for dissolution was 95KJ/㏖. These values are higher than those of Al-Li binary alloy. Peak hardness value(Hv 155) was obtained at 210℃ for 1hr aging treatment which coincided with finishing point of δ´precipitation.
열분석 방법에 의한 급냉응고 Al-Li-Zr 합금의 시효거동 연구
홍영준,강정윤,김인배,이상래,Hong, Yeong-Jun,Gang, Jeong-Yun,Kim, In-Bae,Lee, Sang-Rae 한국재료학회 1995 한국재료학회지 Vol.5 No.4
급냉응고된 Al-3.51wt%Li-0.34wt%Zr 합금의 시효거동을 시차주사열량계(DSC)에 의한 열분석 방법으로 조사하였다. DSC에 의한 비열측정 결과 $\delta$’의 석출에 의한 발열반응과 $\delta$, $\beta$ 및 복합석출상의 석출에 의한 발열반응을 확인하였으며 $\delta$’ 및 $\delta$의 재고용에 의한 2개의 흡열반응을 확인하였다. 7$0^{\circ}C$ 저온시효시 $\delta$’의 석출에 의한 발열반응 이전에 흡열반응이 나타났으며 이것은 $\delta$’ 석출 이전에 $\delta$’ 전구생성물이 형성되었음을 의미한다. DSC 곡선상에 나타난 발열과 흡열곡선을 해석하여 얻은 $\delta$’상 석출과 재고용의 활성화에너지값은 각각 83KJ/mol과 98KJ/mol로서 Al-Li 2원계 및 Al-Li-Mg에 비해 높은 값을 나타내엇으며, 시효에 의한 강화가 일어나 DSC에 의한 비열변화 조사결과 나타난 $\delta$’상 석출 완료 시효조건점 (21$0^{\circ}C$, 1시간)에서 최고경도값(Hv 160)을 나타내었다.
이차 감염을 동반한 개화성 백악-골 이형성증의 치료 : 2례의 증례 보고
홍영준,최용석,명훈 대한구강악안면병리학회 2017 대한구강악안면병리학회지 Vol.41 No.3
Florid cemento-osseous dysplasia (FCOD) is benign and exhibits multifocal involvement of tooth-bearing areas of the jaw. Initially, the lesions are radiolucent but become mixed. In late stages, the lesions change into a radiopaque mass with a thin radiolucent rim. Most FCOD cases are asymptomatic, and conservative treatment is recommended. However, surgical intervention is necessary in secondary infected cases. Because of hypovascularity, infected lesions are difficult to manage and do not respond to antibiotic medications. This clinical report describes the treatment of secondary infection of an FCOD lesion with both conservative and surgical interventions.
홍영준,정명호,최윤하,송진아,김동한,이기홍,쿠쉬드아메드,푸토시야마나까,이민구,박근호,심두선,윤남식,윤현주,김계훈,박형욱,김주한,안영근,조정관,박종춘,강정채 대한내과학회 2011 대한내과학회 추계학술발표논문집 Vol.2011 No.1
Background: We used virtual histology-intravascular ultrasound (VH-IVUS) to evaluate the relation between microalbuminuria and plaque components in 920 patients. Methods: Patients with albumin levels <30 mg/g of creatinine were defined as having normoalbuminuria (n=824), those with albumin levels of 30 to 300 mg/g as having microalbuminuria (n=96). Results: Microalbuminuria group was presented with more acute coronary syndrome (ACS) (72% vs. 61%, p=0.018) and was more diabetics (53% vs. 26%, p<0.001). In ACS patients, %necrotic core (NC) volume was significantly greater in microalbuminuria group compared with normoalbuminuria group (19±10% vs. 15±9%, p=0.019), but not in patients with stable angina. In ACS patients, thin-cap fibroatheroma (TCFA) was observed more frequently in microalbumiuria group (36% vs. 18%, p=0.008), and microalbuminuria was the independent predictor of TCFA (Odds ratio=1.106; 95% CI 1.025-1.144, p=0.018). In diabetic patients, %NC volume was significantly greater in microalbuminuria group compared with normoalbuminuria group (20±9% vs. 16±10%, p=0.017), but not in non-diabetic patients. In diabetic patients, TCFA was observed more frequently in microalbumiuria group (38% vs. 17%, p=0.002) and microalbuminuria was the independent predictor of TCFA (Odds ratio=1.120; 95% CI 1.038-1.204, p=0.012). Conclusions: Microalbuminuria was associated with more vulnerable plaque components in ACS and diabetic patients. More intensive medical therapy is needed to stabilize the vulnerable plaque if microabluminuria is observed in diabetic ACS patients.
홍영준,김순호,강민철,김인 배 ( Y . J . Hong,S . H . Kim,M . C . Kang,I . B . Kim ) 한국열처리공학회 1993 熱處理工學會誌 Vol.6 No.3
Effects of aging treatment on the microstructural evolution of a rapidly solidified Al-Li-Cu alloy were investigated by diffcerential scanning calorimetry (DSC) and transmission electron microscopy(TEM). It was found that the precipitation sequence was : supersaturated solid solution α`→metastable δ`+stable precipitate T₁→stable precipitates δ+T₁. Two exothermic and two endothermic peaks are detected by DSC analysis. The two exothermic and endothermic peaks corresponded to δ` and δ+T₁ precipitation and dissolution reactions respectively. The enthalpy of δ` precipitation decreased with increasing of aging temperature and time until the finishing point of precipitation. The activation energy for precipitation of δ` was measured as 80KJ/㏖ and the energy for dissolution was 93KJ/㏖. These values are higher than those of Al-Li binary alloy. Peak hardness value (Hv 170) was obtained at 210℃ for 1hr aging treatment which coincided with finishing point of δ` precipitation.
홍영준,정명호,최윤하,송진아,김동한,이기홍,쿠쉬드아메드,푸토시야마나까,이민구,박근호,심두선,윤남식,윤현주,김계훈,박형욱,김주한,안영근,조정관,박종춘,강정채 대한내과학회 2011 대한내과학회 추계학술발표논문집 Vol.2011 No.1
BACKGROUND: The impact of tissue prolapse (TP) on clinical outcomes after stent implantation is still not well known. OBJECTIVES: We used intravascular ultrasound (IVUS) to evaluate the association of TP with short- and long-term clinical outcomes after stent implantation in 418 acute myocardial infarction (AMI) patients (155 ST segment elevation and 263 non-ST segment elevation MI). METHODS: TP was defined as tissue extrusion through the stent strut at post-stenting. We evaluated the incidences of stent thrombosis, no-reflow, and long-term clinical outcomes. RESULTS: After stenting, TP was detected in 34% without difference according to the stent types. Acute and subacute stent thrombosis occurred more frequently in patients with TP compared with those without TP (3.5% vs. 0.7%, p=0.035, and 4.2% vs. 0.7%, p=0.013, respectively). However, no significant difference was observed in the incidence of late stent thrombosis between both groups. No-reflow was developed more frequently in patients with TP compared with those without TP (25.4% vs. 9.8%, p<0.001). Creatine kinase-MB (+9.0±25.2 U/l vs. -4.2±41.6 U/l, p=0.001) and cardiac specific troponin-I (+10.0±43.5 ng/ml vs. -1.2±35.6 ng/ml, p=0.005) were elevated more significantly after stenting in patients with TP compared with those without TP. There were no significant differences in the incidences of cardiac death, MI, and target vessel revascularization at 1-year. Multivariate analysis showed that TP was the independent predictor of composite of acute and subacute stent thrombosis [odds ratio (OR)=4.211; 95% CI 1.198-14.805, p=0.025] and composite of acute stent thrombosis and no-reflow (OR=2.551; 95% CI 1.315-4.952, p=0.006). CONCLUSIONS: TP was associated with short-term complications (acute and subacute thrombosis and no-reflow phenomenon), however it was not affect long-term clinical outcomes after stent implantation in patients with AMI.