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임동건,정세민,최유신,김도영,이준신 성균관대학교 1997 학술회의지원논문목록집 Vol.1997 No.-
We have investigated Pt and RuO₂as a bottom electrode for a device application of PZT thin film. The bottom electrodes were prepared by using an RF magnetron sputtering method. We studied some of the property influencing factors such as substrate temperature, gas flow ratem and RF power. An oxygen partial pressure from 0 to 50% was investigated. The results show that only Ru metal was grown without supplying any O₂gas. Both Ru and RuO₂phases were formed for O₂partial pressure between 10-40%. A pure RuO₂phasewas obtained with O₂partial pressure of 50%. A substrate temperature from room temperature to 400°C was investigated with XRD for the film crystallinity examination. The substrate temperature influenced the surface morphology and the resistivity of Pt and RuO₂ as well as the film crystal structure. From the various considerations, we recommend the substrate temperature of 300°C for the bottom electrode growth. Because PZT film growth on top of bottom electrode requires a temperature process higher than 500°C, bottom electrode properties were investigated as a functiona of post anneal temperature. As post anneal temperature was increasedm the resistibity of Pt and RuO₂was decreased. However, almost no change was observed in resistibity for an anneal temperature higher than 700°C . From the studies on resistivity and surface morphology, we recommend a post anneal temperature less than 600°C.
체육 동아리 활동이 전문대학생의 정신건강에 미치는 영향
추건이,강동구 한국스포츠리서치 2004 한국 스포츠 리서치 Vol.15 No.5
This study's aim is the effect of club physical activity on the mental health of college students who are in important terms in aspect of mental, total of 400 college students (located in In-cheon) were put into one of 2 group. (Group 1 : students who participated in club physical activity, Group 2 : Non participated). It was used Questionary paper. The results as follows after comparison and analysis of mental health between two group depend on club physical activity. 1. In obsession, There are a meaningful difference between Group 1 and Group 2(P<.01). Group 1 was lower than Group 2. 2. In anxiety, There are a meaningful difference between Group 1 and Group 2(P<.01). Group 1 was lower than Group 2. 3. In sensitiveness, There are a meaningful difference between Group 1 and Group 2(P<.05). Group 1 was lower than Group 2. 4. In melancholia, There are a meaningful difference between Group 1 and Group 2(P<.01). Group 1 was lower than Group 2. 5. In hostility, There are a meaningful difference between Group 1 and Group 2(P<.01). Group 1 was lower than Group 2. 6. There are no difference in mental health according to sex of club physical activity. Above-mentioned results release that club physical activity give affirmative effect in mental health to college students. Therefore, we have to promote various program of club physical activity, need to improve specific program at least a kind of 3-4 according to college condition.
김상수,임동건,이준신,심경석,김홍우,이만근 성균관대학교 1997 학술회의지원논문목록집 Vol.1997 No.-
We investigated grain boundary effect for terrestrial applications of solar cells with low cost, large area, and high efficiency. Grain boundaries are known as potential barriers and recombination centers for the photo generated charge carriers, which make it difficult to achieve a high efficiency cell. To reduce these effects of grain boundarues, we investigated various influencing factors such as thermal treatments various grid patterns selective wet etchings for grain boundarues, buried contact metallizations along grain boundaries, and use of metallic thin films. From the various grid patterns we learned that the series resistance of solar cell reduced open circuit voltage and consequently decreased the cell efficiency. This paper describes the effect of various grid patterns and the employment of metallic thin films for a top electrode.
A-Si:H/Cd 계면층을 이용한 a-Si:H의 결정화 연구
김도영,최유신,임동건,이준신,김홍우,이수홍 성균관대학교 1997 학술회의지원논문목록집 Vol.1997 No.-
We studied the crystallization of a-SiH thin film. Multi crystallized Si fillms are preferred in many applications such as FPD, solar cells, RAM, and integrated circuits. Because most of these applications require a low temperature process, we investigated a crystallization of a-SiH using a Cd layer. A metal Cd shows an eutectic point at a temperature of 321°C. THis paper present Cd layer assisted crystallization of a-SiH film for the various grain growth parameters such as anneal temperature. Cd layer thickness and anneal time.
Clinicopathologic characteristics of serosa-positive gastric carcinoma in elderly patients
Ho Gun Kim,Hyo Kang,Dong Yi Kim,Jae Kyoon Joo,Seong Yeob Ryu,Jae Hyuk Lee 대한외과학회 2011 Annals of Surgical Treatment and Research(ASRT) Vol.81 No.1
Purpose: The relationship between the prognosis and the age of patients with gastric carcinoma is controversial. This study examined the clinicopathologic features of elderly gastric carcinoma patients with serosal invasion. Methods: We reviewed the hospital records of 136 elderly gastric carcinoma patients with serosal invasion retrospectively to compare the clinicopathologic findings in the elderly (aged > 70 years) and young (aged < 36 years). Results: The 5-year survival rates of elderly and young patients with curative resection did not differ statistically (33.9% vs. 43.3%; P = 0.318). Multivariate analysis showed that two factors were independent, statistically significant parameters associated with survival: histologic type (risk ratio, 1.805; 95% confidence interval [CI], 1.041 to 3.132; P < 0.05) and operative curability (risk ratio, 2.506; 95% CI, 1.371 to 4.581; P < 0.01). Conclusion: This study demonstrated that elderly gastric carcinoma patients with serosal invasion do not have a worse prognosis than young patients. The important prognostic factor was whether the patients underwent curative resection.
적출 흰쥐 흉부대동맥에서 L-Arginine 및 L-NAME 처치가 Propofol 혈관 이완 반응에 미치는 영향
임동건,김병권,백운이,박진웅,홍정길,하미희,손현호 대한마취과학회 1999 Korean Journal of Anesthesiology Vol.37 No.5
Background : Propofol decreases arterial blood pressure. This has been ascribed to vasodilation and decreased cardiac output occurring separately or in combination. This study investigated the relaxant effects of propofol and the effects of L-arginine and L-NAME on the vasodilation of propofol in rat thoracic aortic rings. Methods : Isolated aortic rings were precontracted with phenylephrine (0.01μM -10μM) cumulatively and 10 minutes before the precontracted phenylephrine treatment, propofol was added cumulatively (1μM-10μM). The effects of L-NAME and L-arginine were evaluated by applying L-NAME (10μM) and L-arginine (10μM) after added propofol and before precontracted phenylephrine. Results : A low concentration of propofol (1 μM) did not reduce phenylephrine-induced contraction but a high concentration of propofol (over 10 μM) reduced it significantly. Propofol also relaxed rat thoracic aortic rings in an endothelium independent manner. The L-NAME and L-arginine treatment did not affect the propofod relaxation. Conclusions : Propofol was shown to have a biphasic vasoactive effect on rat thoracic aorta rings. The vasodilation effect of propofol was not related to the production of nitric oxide. (Korean J Anesthesiol 1999; 37: 885∼892)