http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
최이천(Y.C.CHOI),유동진(D.J.YOO),전기찬(G.C.JUN) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_1
Tailored Blanks are defined as two or more separate pieces of sheet material having the same or dissimilar thickness and/or physical properties, joined together before forming. Its application is being increased especially in the automotive industrial area for the cost reduction, weight saving, and improvement of strength.<br/> This paper describes some experimental investigations on the formability of a door inner. There will be a description of how the laser welded blanks behave in different. combination of thickness and sheet material. To investigate how the combination of thickness and material property influences the movement of welding line, a series of laser welded TIE blanks were tested.<br/> <br/>
장성호,신장모,최이천,서대교 성균관대학교 기계기술연구소 2001 성균관대학교 논문집 기계기술편 Vol.4 No.1
The limiting drawing ratio(LDR) under uniform beating of blanks was measured at the various temperature ranges between 25℃ and 250℃ by using two different blank shapes, square and circular blanks, and six different blank sizes with the drawing ratios(DR) of 2.4 to 2.7. The orgaric coated steel skeets(SCP3CJ-3K/3K) of 0.7mm thickness were used. The maximum drawing ratio at 200℃ reached 1.2 times of that at room temperature, and the drawing depth without fracture reached 1.8 times. The higher temperature was adopted, the more stable and uniform thickness strain distribution was observed.The limiting drawing ratio(LDR) under uniform beating of blanks was measured at the various temperature ranges between 25℃ and 250℃ by using two different blank shapes, square and circular blanks, and six different blank sizes with the drawing ratios(DR) of 2.4 to 2.7. The orgaric coated steel skeets(SCP3CJ-3K/3K) of 0.7mm thickness were used. The maximum drawing ratio at 200℃ reached 1.2 times of that at room temperature, and the drawing depth without fracture reached 1.8 times. The higher temperature was adopted, the more stable and uniform thickness strain distribution was observed.
레스베라트롤에 의한 골육종 Saos-2 세포의 세포고사
이현장,양재현,최익준,최이천,김용권,임창인,윤재도,김호찬,원진숙,박래길 한국독성학회 2002 Toxicological Research Vol.18 No.3
Resveratrol, a phytoalexin found in grapes, berries, and peanuts, is one of the most promising agents for cancer prevention. Recent studies show that the antitumor activity of resveratrol occurs through p53-mediated apoptosis. This study demonstrated the mechanism that resveratrol induced apoptosis in human osteosarcoma Saos-2 cells lacking p53. Treatment of osteosarcoma Saos-2 cells with resveratrol resulted in decreased of cell viability, which was revealed as apoptosis characterized by activation of caspase-3 protease as well as cleavage of poly(ADP-ribose) polymerase (PARP) with change of mitochondrial membrane potential transition. These results suggest that resveratrol may be potentially useful to treat osteosarcoma via activation of caspase protease and mitochondrial dysfunction.