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배성근,권성우,김세원,차수원,Bae, Sung Geun,Gwon, Seong Woo,Kim, Se Won,Cha, Soo Won 대한토목학회 2014 대한토목학회논문집 Vol.34 No.3
최근 국내에서는 원유 정제과정에서 많은 양의 부생황이 발생하고 있다. 유황콘크리트는 시멘트 풀을 유황개질 바인더로 대체한 콘크리트로서 시멘트 제조시에 대량으로 발생되는 $CO_2$의 저감 및 원유 정제산업에서 부생되는 황을 활용할 수 있는 이점이 있다. 또한 유황콘크리트는 반복해서 재활용할 수 있는 친환경적이고 지속가능한 재료이다. 이 연구에서는 개질유황 바인더를 사용한 유황콘크리트의 물리적 특성을 실험을 통하여 검토하였다. 실험 결과, 유황콘크리트는 대체적으로 50~80MPa 이상의 고강도 특성을 보였다. 단위질량, 탄성계수 및 인장강도는 포틀랜드 시멘트 콘크리트(PCC)와 유사하였다. 순환굵은골재를 유황콘크리트에 적용하는 경우 순환골재의 단점을 보완하는 동시에 고강도콘크리트 제조가 가능하다. 유황콘크리트의 열팽창계수는 PCC보다 다소 큰 값으로 나타내고 있으나, 채움재를 혼입하여 일반 콘크리트 수준의 열팽창계수를 보이는 것으로 나타났다. Recently, a huge amount of sulfur has been produced as a byproduct of petroleum refining processes in Korea. Sulfur concrete is made of modified sulfur binder instead of cement paste, which has advantages of reducing $CO_2$ emission from cement industry as well as utilizing surplus sulfur. Also, sulfur concrete is a sustainable material that can be repetitively recycled. In this study, the physical properties of sulfur concrete are experimentally investigated. From the test results, sulfur concrete showed compressive strengths higher than at least 50MPa. Also, the unit weight, modulus of elasticity and splitting tensile strength of sulfur concrete was similar to that of Portland cement concrete (PCC). The coefficient of thermal expansion of sulfur concrete was a little larger than that of Portland cement concrete and sulfur concrete with mineral filler is helpful to lower the coefficient of thermal expansion. recycled aggregate sulfur concrete resulted in a slight reduction in the compressive strength, but sulfur concrete with recycled aggregate can achieve the high strength characteristics.
양막이식술을 이용한 군날개 제거술에서 마이토마이신 C의 효과
배성근,김정규,이진기,박대진,Sung Geun Bae,Jeong Kyu Kim,Jin Ki Lee,Dae Jin Park 대한안과학회 2012 대한안과학회지 Vol.53 No.2
Purpose: To compare postoperative recurrence rates of pterygium surgery with amniotic membrane transplantation with and without mitomycin C. Methods: A retrospective analysis of 45 eyes of 43 patients who underwent pterygium surgery with amniotic membrane transplantation with a minimum of six months of follow-up. Nineteen eyes underwent mitomycin C application, while the remaining 26 eyes did not. Recurrence rates and complications were evaluated. Results: With a minimum of six months of follow-up, fibrovascular tissue in the excised area not invading the cornea (conjunctival recurrence) was noted in two eyes (10.5%), and fibrovascular tissue invading the cornea (corneal recurrence) was noted in one eye (5.4%) in the amniotic membrane transplantation with mitomycin C group. Conjunctival recurrence was noted in six eyes (23.1%) and corneal recurrence in three eyes (11.5%) in the amniotic membrane transplantation without mitomycin C group. Recurrence rate in the amniotic membrane transplantation with mitomycin C group (15.9%) was significantly lower (p = 0.014) than that in the amniotic membrane transplantation without mitomycin C group (34.6%). Complications included sub-amniotic membrane hemorrhage in two eyes, granuloma in one eye, and wound dehiscence in one eye in each group. There were no specific complications related to usage of mitomycin C. Conclusions: In pterygium surgery with amniotic membrane transplantation, application of mitomycin C is an effective method to reduce recurrence rates, especially conjunctival recurrences that are related to cosmetic problems. This method may also be helpful to reduce patient discomfort. J Korean Ophthalmol Soc 2012;53(2):200-207