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히알루론 산을 이용한 비수술적 눈꺼풀 위치 이상의 치료효과
정석중,신현민,유혜린.Seok Joong Chung. MD. Hyun Min Shin. MD. Helen Lew. MD 대한안과학회 2012 대한안과학회지 Vol.53 No.3
Purpose: The present study investigated the outcomes of nonsurgical treatment of abnormal eyelid position using hyaluronic acid gel. Methods: Abnormal eyelid position including 18 eyes with lid retraction, 10 eyes with lagophthalmos, and 18 eyes with ectropion were treated with hyaluronic acid gel. The mean age was 50 ± 17.8 years and the mean observation period was 11 ± 2.4 months. The photographs of patients were taken before injection, 1 month, 4 months, and at the last follow-up after injection. The marginal reflex distance 1 (MRD1) and marginal reflex distance 2 (MRD2) of patients were measured and analyzed by the Image J Program. The severity of ectropion was graded by a scoring system. Results: Ten eyes with lagopthalmos improved 1.9 ± 1.2 mm after injection. The 16 eyes with lid retraction improved 1.3 ± 0.9 mm. Twenty-three eyes with ectropion improved and 17 eyes (81%) were completely corrected. The average frequency of injection was 1.1 and the average dose of injection was 0.4 ± 0.12 cc. No significant complications were observed in any patient. Conclusions: Hyaluronic acid gel injections can be used safely and effectively as a nonsurgical treatment for patients with abnormal eyelid position without any significant complications. J Korean Ophthalmol Soc 2012;53(3):357-364
질산태 질소 정량을 위한 환원 증류법에서 Devarda’s Alloy의 입자크기 및 함량이 미치는 영향
정석호(Seok Ho Jung),권현재(Hyun Jae Kwon),정덕영(Doug Young Chung),한광현(Gwang Hyun Han) 韓國土壤肥料學會 2011 한국토양비료학회지 Vol.44 No.3
We analyzed the particle size distributions of three commercially available Devarda’s alloy (DA) products, tested the nitrate recoveries of each particle size category, and examined the amounts of DA required for 100% recovery by varying NO3−N concentration from 0.5 to 10 mg. We observed that use of DA coarser than 200 mesh resulted in poor analytical recovery (< 80%). While the tested alloys were considered to be fine enough (>90% of the particles were less than 100 mesh), the recovery dramatically declined from 80% to 10% in a high concentration range (4 to 10 mg N). Satisfactory recovery was obtained by increasing the amount of finer DA (less than 300 or 450 mesh). However, there was no quantitative relationship between the amount of fine DA and nitrate recovered. Generally, the amount of nitrate reduced per unit DA decreased as the recovery efficiency declined. These results suggest that a sufficient amount of DA must be determined based on particle size distribution, and that treatment of at least two levels of DA and comparison of the subsequent change in nitrate recovery is required for soils containing high levels of nitrate. In addition, further studies are encouraged to account for the observed stoichiometric dis-equivalence of recovered nitrate N per unit mass of DA.
호기순환 호흡계를 이용한 토양처리 석탄바닥재의 유기물 분해에 미치는 영향
정석호(Seok-Ho Jung),정덕영(Doug-Young Chung),한광현(Gwang-Hyun Han) 한국토양비료학회 2012 한국토양비료학회지 Vol.45 No.2
석탄 연소 부산물인 비산회 (fly ash)는 이산화탄소 발생을 저감하고 토양 탄소를 격리하는 효과가 있음이 보고된바 있다. 같은 연소 부산물인 석탄바닥재 (bottom ash)는 비 산회와 유사한 화학적 성질을 가지고 있고, 아울러 다공성으로 토양미생물들이 정착하는 적절한 담체로서의 기능을 가지고 있다. 이에 본 연구는 성질이 다른 유기물들 (헤어리베치, 청보리, 유박비료)이 처리된 토양에서 석탄바닥재가 토양 미생물들에 의한 유기물 분해 및 호흡량에 미치는 영향을 조사하였다. 미생물에 의한 유기물의 분해속도는 유박비료, 헤어리베치, 청보리의 순으로 높게 나타났고, 유기물과 석탄바닥재를 함께 처리하였을 때, 유의하게 감소하였다. 이산화탄소 발생량의 경시적인 변화는 유기물의 이분해성에 의존하였으나, 석탄바닥재를 처리하였을 때 유의하게 발생량이 감소하였다. 총 누적 이산화탄소 발생량 또한 이와 유사한 결과를 보였다. 석탄바닥재가 함유하고 있는 중금속 등과 같은 유해물질의 농도가 높지 않다면, 본 연구의 결과들은 석탄바닥재가 토양 처리 유기물의 이산화탄소 발생 저감 및 토양 탄소격리에 긍정적으로 기여 할 수 있는 소재로서 가능성이 있음을 보여준다. Disposal of high amount of coal combustion by-products, such as fly ash and bottom ash, is of a great concern to the country, due to the huge treatment cost and land requirement. On the other hand, those coal-ash wastes are considered to have desirable characteristics that may improve physical, chemical, and biological properties of soils. Especially, compared with fly ash, bottom ash has a larger particle size, porous surface area, and usable amount of micronutrients. In the present study, we examined bottom as a soil amendment for mitigating CO₂ emission and enhancing carbon sequestration in soils fertilized with organic matter (hairy vetch, green barely, and oil cake fertilizer). Through laboratory incubation, CO₂ released from the soil was quantitatively and periodically monitored with an enforced-aeration and high-temperature respirometer. We observed that amendment of bottom ash led to a marked reduction in CO₂ emission rate and cumulative amount of CO₂ released, which was generally proportional to the amount of bottom ash applied. We also found that the temporal patterns of CO₂ emission and C sequestration effects were partially dependent on the relative of proportion labile carbon and C/N ratio of the organic matter. Our results strongly suggest that amendment of bottom ash has potential benefits for fixing labile carbon as more stable soil organic matter, unless the bottom ash contains toxic levels of heavy metals or other contaminants.
정석현,노대현,강창호,강석원,한봉희,이기명,나영선,Chung, Seok-Hyun,No, Daehyun,Kang, Changho,Kang, Sukwon,Han, Bong-Hee,Lee, Gee-Myung,Na, Young-Sun 한국식물생명공학회 2004 식물생명공학회지 Vol.31 No.4
식물조직배양용 바이오리액터 8개의 배양액 P보, DO 농도를 on-line으로 계측하고 pH 농도 및 주입공기 량을 제어할 수 있는 시스템을 개발하였다. 시스템 제어용 컴퓨터 프로그램은 나리구근의 성장단계에 맞는 주입공기량을 추종제어방식으로 제어하며, 바이오리액터 내부의 pH 변화를 감지하여 오염을 감시하는 오염경보기능이 포함되어있다. 성장단계에 따라 적절한 주입공기량의 선정을 위하여 시뮬레이션 한 결과 배양초기에는 300 cc/min, 20일 경과 후에는 400 cc/mim, 40일 경과 후에는 500 cc/min, 60일 경과 후에는 600 cc/min, 그리고 80일 경과 후부터는 700 cc/min의 공기를 주입할 경우 바이오리액터내 나리구근의 분포가 고르게 나타났으며, 이 결과를 바이오리액터 배양실험에 이용하였다 배양액의 pH 농도 제어 시스템은 배양 전 기간동안에 제어 목표 값 (5.5$\pm$0.5)로 제어할 수 있었다. The bioreactor system for the large-scale plant tissue culture was developed to control the pH concentration and DO (dissolved oxygen), and air flowrate. The system controlling the proper air flow rate for each bulblet growth stage and monitoring the contamination of bioreactor using the pH change was controled by computer program. For the uniform bulblet distribution in bioreactor, the proper air flow rate was 300 cc/min at the beginning of bulblet culture, 400 cc/min after 20 days, 500 cc/min after 40 days, 600 cc/min after 60days, and 700 cc/min after 80 days. It was possible to maintain the pH concentration within 5.5$\pm$0.5 during the culture by control system of bioreactor.