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에너지 절감 및 오염물질방출의 감소를 위한 폐자원의 재활용
오준성 전남대학교 지역개발연구소 1988 지역개발연구 Vol.20 No.1
The recycling of secondary raw material from waste by processing-engineering means less environmental nuisance, especially to diminish discharge quantity of various pollutant in urban area. Moreover, it is of great importance with regard to reduce energy consumption. This paper has analysed the economy of household waste treatment by processing -engineering method. It can be concluded that a processing-engineering will be economically operated with a rapacity over 120 t/h for the recovery of secondary raw material. The recovery ratio of five waste material-paper, plastics, metal, glass and direct combustible organic matter must be exceeded 65%
생체적 적용을 위한 전기전도성을 갖는 그래핀과 폴리카프로락톤 복합물질 전기방사 섬유형 필름
오준성,이은정 한국재료학회 2021 한국재료학회지 Vol.31 No.5
This study produces electroconductive polycaprolactone (PCL)-based film with different amounts of graphene (G) through electrospinning, and the characteristics of the produced G/PCL composites are investigated. The G/PCL results are analyzed by comparing them with those obtained using pure PCL electrospun film as a control. The morphology of electrospun material is analyzed through scanning electron microscopy and transmission electron microscopy. Mechanical and electrical properties are also evaluated. Composites containing 1% graphene have the highest elongation rate, and 5% samples have the highest strength and elasticity. Graphene contents > 25% show electro-conductivity, which level improves with increase of graphene content. Biological characteristics of G/PCL composites are assessed through behavioral analysis of neural cell attachment and proliferation. Cell experiments reveal that compositions < 50% show slightly reduced cell viability. Moreover, graphene combinations facilitated cell proliferation compared to pure PCL. These results confirm that a 25 % G/PCL composition is best for application to systems that introduce external stimuli such as electric fields and electrodes to lead to synergistic efficiency of tissue regeneration.
Photodynamic Graphene Oxide Combined Alginate Hydrogel for Controlled Drug Release
오준성,이은정 한국고분자학회 2021 Macromolecular Research Vol.29 No.5
Graphene is a widely used material as a therapeutic agent (drug) carrier due to its low toxicity, high surface area, specific flake-shape, 2-dimensional structure and geometry. In order to evaluate the efficiency of drug delivery improved by using graphene oxide as a drug carrier, drug release experiment using Cytochrome-C (Cyto- C), a model drug, was carried out. First of all, different ratios of Cyto-C were combined with 100 mg GO to investigate the best drug-loading efficiency so that the best loading ratio was confirmed with Cyto-C:GO of 1:2. Alginate hydrogel (Alg hydrogel) and Alginate-Graphene oxide hydrogel (Alg-GO hydrogel) were fabricated by cross-linking in 0.1 M CaCl2 solution. Characterization of the hydrogels was confirmed by Fourier transform infrared (FT-IR) and scanning electron microscope (SEM) analysis. The drug efficiency by the ratio of graphene oxide to Cyto-C was compared by ultraviolet visible spectrophotometer (UV-VIS). The difference in drug release behavior in hydrogels was confrimed by drug release test. The Alg-GO hydrogel exhibited slow and steady release compared to that of alginate hydrogel as control. In this study, we demonstrated that applying graphene oxide as a drug carrier affects in control of drug release behavior.
하수슬러지와 토양을 이용한 음식폐기물의 혐기분해가스화(Ⅰ)
오준성 ( Joon-seong Oh ),김성대 ( Sung-dae Kim ) 한국환경기술학회 2008 한국환경기술학회지 Vol.9 No.4
음식폐기물로부터 고농도의 CH<sub>4</sub>을 생산하기 위하여 L×W×H=66×66×142(cm)의 배치식 혐기분해 가스화실을 토양층 내에 설치하였다. 이 혐기분해가스화실내에 음식폐기물, 토양 및 하수슬러지를 일정 두께의 층으로 저장하였으며 저장 후 10일 간격으로 발생가스를 36회 측정하였다. 음식폐기물, 토양 및 하수슬러지의 성층두께를 90/21/21(cm), 45/10.5/10.5(cm) 그리고 30/7/7(cm)의 3종류로 하였으며 가장 바람직한 CH<sub>4</sub> 발생은 성층두께 30/7/7(cm) 조건에서 얻었으며 그 결과는 다음과 같다. ○ CH<sub>4</sub> 발생농도는 90일째부터 40% 이상을 나타냈으며 360일째에도 48.8%로 측정됨 ○ 최고의 CH<sub>4</sub> 발생농도는 150일째에 66.3%로 측정됨 ○ 발생 CH<sub>4</sub>의 330일 동안의 평균농도는 46.6%로 산출됨 In order to produce a high concentration CH<sub>4</sub> from food waste was installed a chamber of anaerobic decomposition gasification with the size L×W×H = 66×66×142 (cm) in underground. Waste food, soil and sewage sludge were disposed in the chamber as a constant layer thickness. The 3 size of layer thickness of waste food, soil and sewage sludge were 90/21/21, 45/10.5/10.5 and 30/7/7(cm). The best result of CH<sub>4</sub> production in the chamber of anaerobic decomposition gasification was obtained with the layer thickness of 30/7/7(cm) and as following : ○ The concentration of CH<sub>4</sub> over 40% was obtained from the 90th days ○ The highest concentration of CH<sub>4</sub> was measured in 150th days as 66.3%. ○ The average concentration of CH<sub>4</sub> was calculated as 46.6% between 30th and 360th days.