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B-P첨가가 박육 구상 흑연주철의 미세구조와 기계적 성질에 미치는 영향
金永煥,崔洋鎭,朴仁善,朴龍鎭 弘益大學校 科學技術硏究所 1995 科學技術硏究論文集 Vol.6 No.-
Effects of B-P addition on microstructure and mechanical properties of thin ductile cast iron have been investigated. The amount of silicon addition have fixed on 4.9wt.% and the amount of phosphorus addition and thickness of specimen have been varied from 0.05 to 0.8wt.% and Φ6mm, Φ10mm, Φ13mm respectively. As the casting thickness decreased the average diameter of spheroidal graphite was decreased and hardness of the cast iron increased. By adding P, the average diameter of spheroidal graphite and the nodule count was decreased countinuously. And tensile strength and elongation were decreased and hardness was increased. With P adding more than 0.2wt,% the amount of wearloss was decreased significantly. The addition of P improved the wear resistance and hardness of thin ducile cast iron.
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Mn첨가가 박육 구상 흑연주철의 미세구조와 기계적 성질에 미치는 영향
朴龍鎭,林祐聖 弘益大學校 科學技術硏究所 1994 科學技術硏究論文集 Vol.4 No.-
As the significance of Spherical Graphite Cast Iron increase, the study of that is researching in many ways. In this study, many effacts of Manganase contents and casting thickness on mechanical properties of Spheroidal Graphite increased, hardness and tensile strength as well. By adding Mn contents, the amount of ferrite decreased and the number of Spheroidal Graphite some decreased. The tensile strength was appeared maximum value at Mn 3.0∼3.5 wt%, and decreased at Mn 40 wt%. The hardness was increased with Mn increasing, and elongation maximum value at Mn 0.5 wt% and by a Mn addition, elongation was decreased. Therefore, as a result of thin section of castion, the mecanical properties of Spherical Cast Iron will be improved, 3.0~3.5 wt% of Mn will take effect on high strength of casting.
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曺東震,韓俊澤,劉憲一,朴龍鎭,金錫胤,慶在浩 弘益大學校 1974 弘大論叢 Vol.6 No.-
The matrix of ductile cast iron are welded by pre-heating it at 300℃ in the room temperature. Through the mechanical, non-desbructive testing and analysis of the composition. the possibility if arc welding of ductile cast iron are studied as follows; 1. L electrode is the best among them in weldability, impact value and machinability. The next is LB electrode followed by S electrode. C electrode is last. However, the tensile strength showed in the following order: LB, S, L, C. 2. LB, S, L, C, all are available for the welding of cast iron. 3. The above experiment showed that L and LB are good in general. In addition LB is low in price, we therefore prospect that it will be widely used as the electrode for cast iron.
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Amisulpride의 지속 투여가 생쥐의 성별에 따른 체중 및 대사에 미치는 영향
이효진,신윤오,전병화,박룡진,김정란,Lee, Hyo-Jin,Shin, Yun-O,Jeon, Byeong-Wha,Piao, LongZhen,Kim, Jeong-Lan 대한생물정신의학회 2008 생물정신의학 Vol.15 No.2
Objectives : This study was conducted to examine the effects on food intake, body weight, and metabolic parameters by amisulpride administration in male and female mice, comparing the effects of risperidone and vehicle administration. Methods : Female and male C57BL/6 mice were grouped into low dose amisulpride(1.5mg/kg), high dose amisulpride(15mg/kg), risperidone(0.1mg/kg) and vehicle. Drugs were administered once daily through intraperitoneal injection over 21days. Body weight was measured weekly and food intake was measured daily. Levels of triglyceride, glucose, insulin and prolactin were determined at the end of experiment(on day 22). Results : In the female mice, low and high dose amisulpride as well as risperidone caused significant weight gains. But weight gains in amisulpride groups were numerically smaller than that of risperidone group. In male mice, only high dose amisulpride caused significant weight gain. Among weight gain groups, only weight gain of male mice with high dose amisulpride was significantly associated with increased food intake. Weight gain group in female mice did not show significant correlation with food intake. In male mice, both amisulpride groups showed significantly high plasma insulin levels compared to vehicle. In female and male mice, low and high dose amiulpride groups showed significant high plasma prolactin levels compared to vehicle. Triglyceride level were not significantly changed in all groups. Glucose level was changed significantly only in male risperidone group. Conclusions : Administration of amisulpride caused more significant weight gains in female and male mice than controls but changes of metabolic parameters were different according to sex of mice. Our results suggest that different mechanisms of amisulpiride are likely to affect weight gain between male and female mice. 목 적 이 연구는 수컷과 암컷 생쥐에서 amisulpride를 투여하였을 때 먹이 섭취량, 체중 및 대사 지표에 대한 영향을 risperidone 및 정상 대조군과 비교하여 알아보고자 하였다. 방 법 수컷과 암컷 C57BL/6형 생쥐를 저용량 amisulpride 투여군(1.5mg/kg), 고용량 amisulpride투여군(15mg/kg), risperidone 투여군(0.1mg/kg)과 Vehicle군으로 나누었다. 약물은 21일간 매일 하루에 한 번 복강 주사를 통해 투여되었다. 체중은 일주일에 한 번씩 측정하였으며 먹이 섭취량은 매일 측정하였다. Triglyceride(TG), glucose, insulin 그리고 prolactin은 실험 종료 시에 측정하였다(실험 22일). 결 과 암컷 생쥐의 경우, 저용량과 고용량의 amisulpride 투여군에서는 유의한 체중 증가를 보였으며, risperidone 역시 유의한 체중 증가를 보였다. 그러나, 두 amisulpride군의 증가량은 risperidone군의 증가량에 비해 수치적으로 작았다. 수컷 생쥐의 경우, 고용량의 amisulpride만이 유의한 체중 증가를 가져왔다. 체중 증가를 보였던 집단 중에서, 고용량의 amisulpride를 투여하였던 수컷 생쥐만이 유의하게 증가된 먹이 섭취량과 연관성이 있었다. 암컷 생쥐에서 체중 증가를 보였던 군들은 먹이 섭취량과 유의한 상관성을 보이지 않았다. 수컷 생쥐에서, 두 개의 amisulpride 투여군 모두는 vehicle에 비해 유의하게 높은 혈장 insulin 수치를 보였다. 암컷과 수컷 생쥐에서, 저용량과 고용량의 amisulpride 투여군은 vehicle과 비교하여 유의하게 높은 혈장 prolactin수치를 보였다. Triglyceride는 모든 집단에서 유의하게 변화하지 않았으며 glucose는 수컷 risperidone 투여군에서만 유의하게 변화하였다. 결 론 Amisulpride는 암수 생쥐에서 체중 증가를 일으키지만, 대사 이상에 대한 결과는 성별에 따라 차이가 있었다. 본 연구의 결과는 amisulpride에 의한 체중 증가에 암수 생쥐에서 서로 다른 기전이 작용할 가능성을 시사한다.
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