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지방유래줄기세포의 지방분화과정에서 활성산소가 미치는 영향
장학,민경희,박영인,김요한,민경원 대한성형외과학회 2011 Archives of Plastic Surgery Vol.38 No.2
Purpose: Stem cells continue to receive research attention in the clinical fields, and adipose - derived stem cells (ADSCs) have been shown to be a good source raw material. Many plastic surgeons are researching the ADSC adipogenesis with a view to conducting clinical trials, and many attempts have been made to identify the factors that promote the adipogenesis of ADSCs, but comparatively few correlation studies have been undertaken to explore the relation between reactive oxygen species (ROS) and the ADSC adipogenesis. We undertook this study is to investigate the effects of ROS on ADSC adipogenesis. Methods: ADSCs were isolated and cultured from abdominal adipose tissue, and cultured in different media; 1) DMEM (control), 2) adipogenesis induction culture medium, 3) adipogenesis induction culture medium with ROS (20 μM / 50 μM H2O2), 4) adipogenesis induction culture medium containing ROS (20 μM / 50 μM H2O2) and antioxidant (10 μM / 20 μM Deferoxamine). We compared adipogenesis in these different media by taking absorbance measurements after Oil - Red O staining every 5 days. Results: After culturing for 20 days, significant differences were observed between these various culture groups. Absorbance results showed significantly more adipogenesis had occurred in media containing adipogenesis induction culture medium and H2O2(in a H2O2 dose - dependently manner) than in media containing adipogenesis induction culture medium and no H2O2 (p < 0.001). Furthermore, in media containing adipogenesis induction culture medium, H2O2, and antioxidant, absorbance results were significantly lower than in adipogenesis induction culture medium and H2O2 (p < 0.001). Conclusions: These findings suggest that ROS promote the adipogenesis of ADSCs. We suggests that ROS could be used in the adipose tissue engineering to improve fat cell differentiation and implantable fat tissue organization.
두경부 유리피판 수술에 있어서의 비천공성 혈관 클립을 이용한 미세혈관 문합술
장학,민경원,김우람,신현우,고경석,Chang, Hak,Minn, Kyung-Won,Kim, Woo-Ram,Shin, Hyun-Woo,Koh, Kyung-Suck 대한미세수술학회 2005 Archives of reconstructive microsurgery Vol.14 No.1
Microvascular anastomosis with suture technique is a basic skill but there are several problems such as stenosis, thrombosis and long operating time. Recently plastic surgeons have developed non-suturing mechanical coupling devices for microvascular anastomosis. The authors applied non-penetrating vascular clips (VCS clips) in the field of free flap surgery of head and neck area. Between August of 2004 and January of 2005, we performed 9 free flaps (16 vessels) using small-sized VCS clips. Four stay sutures were applied first and then VCS clips were placed between sutures about 1 mm apart. Vascular pedicle of free flap included the descending branch of lateral circumflex femoral vessel, thoracodorsal vessel, deep inferior epigastric vessel and cephalic vein. The recipient vessels were the superior thyroid artery, superficial temporal artery, internal jugular vein, external jugular vein, and superficial temporal vein. We performed 13 end-to-end (4 arteries and 9 veins) and 3 venous end-to-side anastomoses. No flap related complication occurred but we applied additional clips or sutures in two cases due to blood leakage after completion of anastomosis. Primary patency rates seemed to be good and more rapid anastomosis could be done than conventional suture technique. Advantages of VCS technique are high patency rate, low thrombogenecity and rapidity. Although the high cost of VCS instrument may be a problem, this clip could be applied safely in microvascular free tissue transfer.
장학상(Haksang Jang),권기항(Keehang Kwon) 한국정보과학회 2004 한국정보과학회 학술발표논문집 Vol.31 No.2Ⅰ
순수 함수형 프로그래밍 언어 Haskell에서의 데이터 추상은 대수 데이터 형과 관련 함수로 묶어진 모듈의 인터페이스만을 노출함으로써 이루어진다. 이러한 데이터 추상에 대한 제한된 용법은 프로그램 설계에 있어 유용하게 사용되는 패턴 매칭을 제약하고, 파일 단위의 추상을 요구함으로써 데이터 구조 단위의 데이터 추상을 불가능하게 한다. 본 논문은 Haskell 의 제한된 데이터 추상 문제를 해결하기 위한 방법으로 패키지 데이터 형을 제안한다. 패키지 데이터 형은 더 작은 단위로 데이터 추상을 가능하게 하고, 패턴 매칭을 제약하지 않고 자유롭게 사용할 수 있게 한다.
장학길(Hak-GiI Chang),김영상(Young-Sang Kim),장영상(Young Sang Chang) 한국식품영양과학회 1987 한국식품영양과학회지 Vol.16 No.2
보리의 利用性을 向上시키기 위하여 開發된 割麥의 製品收率과 加工所要電力에 대하여 검토하였다.<br/> 1. 割麥製品은 搗精度가 높아짐으로서 麥碎率이 증가되었으며, 混合品을 加工했을 때는 麥碎率은 더욱 증가되었다.<br/> 2. 割麥의 粒長/粒幅比率은 製品收率에 따라 2.09~2.13으로 精麥의 1.36보다 컸다.<br/> 3. 加工所要電力은 割麥과 精麥의 同一收率에서 割麥이 증가되었으나, 割麥의 搗精收率을 감소시킴으로서 電力所要量은 급격히 낮아졌다. 混合品 加工으로 인한 加工電力의 所要는 쌀보리 1等品 단독사용시와 차이가 없었다.<br/> 4. 1次 搗精比率을 증가시킴으로서 製品M/T當 生産에 所要되는 總加工電力은 감소되었다. Crease cut pearled barley was studied in relation to product and quality, and processing electricity requirement with various pearling yields.<br/> 1. Increasing the pearling rate resulted in increasing broken grain of cut-polished barley.<br/> 2. The range of length/width ratio in cut-polished barley were from 2.09 to 2.13 and those of pearled barley were 1.36, respectively.<br/> 3. Cut-polished barley required more electricity than pearled barley at the same polishing rate. As pearling rate increased at first polishing before cutting, total electricity requirement of cut-polished barley reduced significantly.