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산업폐기물 소각로에서 SNCR공정에 의한 NOx 제거효율에 관한 연구
류해열,김민철,정종현,이강우,정진도,Ryu Hae-Yeol,Kim Min-Choul,Jung Jong-Hyeon,Lee Gang-Woo,Chung Jin-Do 한국환경보건학회 2005 한국환경보건학회지 Vol.31 No.4
The environmental regulations in the world has been reinforced and many nations has devoted themselves to the development of cost-effective technology. Selective catalyst reduction(SCR) and selective non-catalyst reduction (SNCR) processes are mainly used to treat nitrogen oxidants generated from fossil-fuel combustion. One of these typical technologies for reduction of do-NOx is SNCR process has increased continuously because of the low cost for building and maintenance. Nevertheless the researches on the application to real scale plant by the reductant like Urea are rarely studied. In this paper, an experimental investigations were performed on the SNCR process in the industrial waste incineration plant. With no reducing agent, the concentration of NOx stayed in around 180 ppm $(O_2\;12\%)$ with the exhausting temperature of $950^{\circ}C$ and changed within the range of 20 ppm to remain relatively consistent. When $10\;wt\%)$ of a solution was added, the efficiency of denitrification reached above $61.4\%$ with the NSR of 2.0 and the exhausting temperature of $950^{\circ}C.$ When the concentration of the urea solution was set to $10\;wt\%$ and the sprinkling to four nozzles, the reaction temperature was reduced to about $50~100^{\circ}C$ with a mixture of $10\;wt\%\;CH_3OH\;and\;5wt\%\;Na_2CO_3$ in $40\;wt\%$ of the solution. The NOx removal efficiency increased to $78.4\%,$ achieving a broader and expansive range of reaction temperatures than the addition of an unmixed pure solution.
Flow Instability of Polyvinyl alcohol)/Dimethyl Sulfoxide Solution under Steady Shear
Do, Sung Yeol,Ryu, Chang Yeol,Lee, Yong Rok,Shim, Jae Jin,Noh, Seok Kyun,Kim, Joon Ho,Joo, Sang Woo,Gal, Yeong Soon,Han, Sung Soo,Lyoo, Won Seok SAGE Publications 2011 Polymers & polymer composites Vol.19 No.6
<P>The effects of solution temperature and molecular weight on the rheological responses of poly(vinyl alcohol) (PVA) semidilute solutions (13 g/dL - 19 g/dL) in dimethyl sulfoxide (DMSO) have been studied using PVA with two different number-average degrees of polymerization (P(n)): 1700 and 4000. For the rheological experiments using dynamic shear, the PVA solution with a P(n) of 1700 showed rather simple Newtonian fluid behaviour, whereas that with P(n) of 4000 exhibited non-Newtonian shear thinning behaviour. Steady shear rheology experiments suggested that the lower P(n) PVA solutions were Newtonian fluids, which is consistent with the dynamic shear rheology results. However, an abrupt decrease of shear viscosity at high shear rates was observed for the higher P(n) PVA solutions at lower temperatures, such as 30 degrees C and 50 degrees C. At higher temperatures of 70 degrees C and 90 degrees C, the higher molecular weight PVA solutions exhibited simple shear thinning behaviour without any further complications of flow instability. The fact that temperature plays a critical role in controlling the observed flow instability of the PVA solutions in DMSO strongly suggests that there exist enhanced inter-chain interactions by hydrogen bonding of PVA chains beyond the chain entanglements, particularly for the higher P(n) PVA semidilute solutions at low temperatures. Therefore, it is important to consider both chain entanglements and hydrogen bonding interactions in order to process PVA solutions without causing undesirable flow instability.</P>
Kim, Do Hyun,Park, Min Su,Kim, Na Un,Ryu, Du Yeol,Kim, Jong Hak American Chemical Society 2018 Macromolecules Vol.51 No.15
<P>CO<SUB>2</SUB> separation technology using polymeric membranes has emerged as a viable solution to mitigate the rapidly increasing anthropogenic CO<SUB>2</SUB> emissions, which are directly linked to global warming and climate anomalies. However, in order to improve the gas separation performance, an intrinsic problem of polymeric membranes, i.e., a trade-off relationship between permeability and selectivity, needs to be addressed. In this study, a solid-state facilitated transport membrane is prepared by blending CO<SUB>2</SUB>-philic, amine-compatible poly(vinyl alcohol)-<I>g</I>-poly(oxyethylene methacrylate) (PVA-<I>g</I>-POEM) graft copolymer and diethylenetriamine (DETA) carriers. The graft copolymer consisting of PVA main chains and POEM side chains is synthesized via one-pot free radical polymerization and used as a polymer matrix. With the incorporation of 10 wt % of DETA into the polymer, the membrane exhibits a high CO<SUB>2</SUB> permeance of 402.5 GPU (1 GPU = 10<SUP>-6</SUP> cm<SUP>3</SUP>(STP)/(s·cm<SUP>2</SUP>·cmHg)) and CO<SUB>2</SUB>/N<SUB>2</SUB> selectivity of 52.1. The enhanced performance of the membrane results from multifunctional amine carriers in the graft copolymer owing to facilitated transport of CO<SUB>2</SUB> and an increase in the crystallinity of the polymer. DETA acts as a seed for crystallization of PVA chains at a low loading, which leads to a reduced N<SUB>2</SUB> permeance. The membrane exhibits good stability without any performance degradation over 2 weeks in the solid state. The superior separation property of the PVA-<I>g</I>-POEM membrane containing DETA distinguishes this facilitated transport membrane from other similar membranes and commercial membranes.</P> [FIG OMISSION]</BR>
과도한 운동으로 발생한 횡문근융해증에 의한 급성신부전증 1예
문철호,류보열,모성환,김태종,기장도,박용관,김용환,정종훈 조선대학교 1995 The Medical Journal of Chosun University Vol.20 No.1
Rhabdomyolysis may be defined as a clinical and laboratory syndrome which releases muscle cell contents into the plasma, such as creatine phosphokinase, due to skeletal muscle injuries. It can be the result of many diverse causes including muscle disease, ischemia, genetic disorder, metabolic disorder, infectious disease, drugs, comatose state, trauma or vigorous exercise that can lead to acute renal failure as a complication. Since first reported in 1941, rhabdomyolysis-induced acute renal failure has been documented many times, and the major causes of this disease are carbon monoxide poisoning, snake bites, and etc in Korea Reports of acute renal failure after exercise-related rhabdomyolysis with myoglobinemia are rare. We report a case of acute renal failure caused by exercise-related rhabdomyolysis in a 20 year old man.
전신홍반루푸스 환자에서 Ceftriaxone과 Isepamicin 투여 후 발생한 전염성 단핵구증 유사 증후군
도주호 ( Ju Ho Do ),류성열 ( Seong Yeol Ryu ) 대한류마티스학회 2008 대한류마티스학회지 Vol.15 No.2
A severe adverse reaction to certain drug could be associated with hypersensitivity syndrome, showing the clinical features of infectious mononucleosis including maculopapular rash, fever, lymphadenopathy, leukocytosis, atypical lymphocytes, liver dysfunction, and renal disturbance. We report a systemic lupus erythematosus patient who developed infectious mononucleosis-like syndrome with administration of ceftriaxone/isepamicin for the treatment of pneumonia. This case warrants careful attention to infectious mononucleosis-like syndrome associated with antibiotics administration, especially in febrile patients with known autoimmune diseases such as systemic lupus erythematosus.
일회 방사선조사를 이용한 마우스 구강점막염 모델의 확립
류승희(Seung-Hee Ryu),문수영(Seung-Hee Ryu),최은경(Eun Kyung Choi),김종훈(Jong Hoon Kim),안승도(Seung Do Ahn),송시열(Si Yeol Song),박진홍(Jin-hong Park),노영주(Young Ju Noh),이상욱(Sang-wook Lee) 대한방사선종양학회 2008 Radiation Oncology Journal Vol.26 No.4
목 적: 두경부 영역에 대한 방사선치료 시 발생하는 구강점막염은 방사선치료로 유발되는 급성 합병증 중에서 가 장 심각하고 해결해야 할 문제점이다. 따라서 본 저자들은 마우스를 이용하여 방사선 구강점막염 모델을 확립하고 자 본 연구를 진행하였다. 대상 및 방법: 본 실험에는 7∼8주령의 20 g 내외의 웅성 BALB/c 마우스 55마리를 사용하였다. 1주일간 순화 후 대조군 5마리를 제외하고 체중에 따라 무작위로 3군으로 나누고 마우스의 두경부에 각각 16, 18, 20 Gy의 방사선을 조사하였다. 방사선조사 후 체중을 매일 측정하고 생존 유무를 관찰하였다. 방사선조사 후 1, 2, 3, 5, 7, 9, 14일째 마우스를 경추탈골사 한 후 설조직을 채취하고 hematoxylin & eosin (H&E) 염색으로 조직학적 변화를 확인하였다. 결 과: 방사선조사군의 경우 5일 이후 급격한 체중감소를 나타내었고 18 Gy와 20 Gy군에서 마우스가 사망하였다. 16 Gy군에서는 5일부터 9일까지는 평균 체중이 감소하였으나 이후 회복되었다. 조직학적 변화를 관찰한 결과 방 사선조사 후 시간경과에 따라 상피층의 두께가 얇아지면서 편평해지는 경향을 나타내었으며 7일과 9일째에 가장 심각한 상태를 나타내었다. 대조군에서 평균 113.50±2.41μm이던 상피층 두께가 방사선조사 후 시간이 지남에 따라 유의하게 그 두께가 감소하였으며 7일째에는 43.9% 감소한 63.70±3.28μm로 최저치를 나타내었다(p<0.0001). 14일째에는 121.00±2.82μm로 대조군과 유의한 차이가 없어 정상적으로 회복되는 것으로 나타났다. 결 론: BALB/c 마우스에서 방사선조사 후 마우스의 체중변화를 관찰 할 수 있는 적절한 방사선 선량은 16 Gy였다. 또한 구강 내 상피조직의 현저한 손상은 방사선조사 후 7일과 9일째 관찰할 수 있었고 9일째에는 심각한 궤양화가 나타났다. 18 Gy와 20 Gy 조사 후 9일과 10일째에 모든 마우스가 사망하였지만 16 Gy 조사군에서는 14일째 조직 이 정상적으로 회복되었다. Purpose: Oral mucositis induced by radiotherapy to the head and neck area, is a common acute complication and is considered as the most severe symptom for cancer patients in the early stages of treatment. This study was proposed to establish the oral mucositis mouse model induced by a single dose of radiation for the facility of testing therapeutic candidates which can be used for the oral mucositis treatments. Materials and Methods: Fifty-five BALB/c mice were divided into four groups: control, 16 Gy, 18 Gy, and 20 Gy. Oral mucositis was induced by a single dose of radiation to the head and neck using 6 MV x-Ray from linear accelerator. After irradiation, body weight and physical abnormalities were checked daily. Tongue tissues from all groups were taken on days 1, 2, 3, 5, 7, 9, and 14, respectively and H&E staining was conducted to examine morphological changes. Results: Body weight dramatically decreased after day 5 in all irradiated mice. In the 16 Gy treatment group, body weight was recovered on day 14. The histology data showed that the thickness of the epithelial cell layer was decreased by the accumulated time after radiation treatment, up to day 9. Severe ulceration was revealed on day 9. Conclusion: A single dose of 16 Gy is sufficient dose to induce oral mucositis in Balb/C mice. Significant changes were observed in the Balb/C mice on days 7 and 9 after radiation. It is suggested that this mouse model might be a useful standard tool for studying oral mucositis induced by radiation.