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AN(Acrylonitrile) 생산 공장에 공해물질 종합 관리 방법의 적용
김병직 崇實大學校 生産技術硏究所 2001 論文集 Vol.31 No.-
Mass integration technique was applied to AN production plant. Ammonia in wastewater stream was the key target pollutant in this process. To increase the AN production, the bio-treatment facility for ammonia wastewater stream was considered the bottle-neck. The objective of this research was to debottle-neck the process without purchasing the new bio-treatment facility. In an attempt to reduce the pollutant and debottle-neck the process, systematic mass integration technique was implemented. The improved flow sheet was simulated by Chemical process Simulator(ASPEN +) for stream and cost analysis. The simulation results showed that AN production has increased by 18%, fresh water usage was decreased by 7.2㎏/s. In conclusion, the existing waste treatment facility can have 150% more surplus capacity through process integration and can be no more bottle-neck step.
막여과공정에서의 비용계산식 모델링 및 조작변수에 따른 비용의 변화에 대한 연구
김병직,왕진수 崇實大學校 生産技術硏究所 1996 論文集 Vol.26 No.1
A cost model for water filtration system using membrane was studied. Capital cost was the sum of non-membrane cost and membrane cost. And Operating cost consisted of energy, chemical, and membrane replacement cost. Integrated mathematical model was developed to estimate the capital and operating cost of variouw size membrane systems. The mathematical medel was translated into C program for convenient and quick use. By use of the program developed, the effect of Permeate Flux, Membrane diameter and service life, cross-flow velocity on total cost was studied. The results of sencitivity analysis are as follows: The cost was inversely related to permeate flux since the number of modules increased as reducing thepermeate flux. The membrane life had a significant effect on the operating cost. Cost of membrane per module decreased with increasing membrane element diameter.The head-loss across the membrane module was inversely proportional to the diameter of the element. Also deposition of material on the membrane surface could be reduced by increasing cross-flow velocity.
중공사 형태의 막여과 공정에서 압력 강하 및 에너지 소비에 관한 연구
왕진수,김병직 崇實大學校 生産技術硏究所 1995 論文集 Vol.25 No.2
Pressure difference is required to purity the untreated water in a membrane-based process. It affects the initial cost and operating cost of the system. Generally, the greater the pressure difference is, the more expensive the water filtration system is. From the experimental data and the derived equations, several design parameters that affect the pressure drop were investigates. The effect of temperature, crossflow velocity, and internal diameter of a fiber on the pressure drop was studied. Within the temperature range of 0℃ to 40℃, as feed water temperature increased, pressure drop required to purify the quantity of the untreated water decreased. And as the crossflow velocity increased, the pressure drop increased. The diameter of 1mm was thought to be a critical size. Below that size, as decreasing the diameter the pressure drop increased sharply. On the other hand, above that size, the pressure drop did not change much with increasing the diameter. Also, the energy cost to produce 1 ton of water was calculated for various modes of membrane-based water treatment systems.
Ketoconazole 장기복용으로 발생한 간격막 섬유증 1 예
김영철,김진일,김용균,안병민,조재완,정규원,배시현,김부성,방춘상,선희식,박두호,성용직,강석진,고윤호,박영민 대한간학회 2000 Clinical and Molecular Hepatology(대한간학회지) Vol.6 No.2
Ketoc onazole, an imidazole derivative, is a broad spectrum antifungal agent which has been used widely in the treatment of systemic or local fungal infections. Mild asymptomatic elevation of plasma transaminase activities occurs in approximately 6% to 17.5% of patients who have used ketoconazole. However, the incidence of symptomatic hepatic injury is low and overt hepatitis develops in about 5% of the patients. Nausea and vomiting are the most frequent side reactions. Histopathological features of the reported ketoconazole induced hepatotoxicity are massive or submassive hepatocellular necrosis involving the acinar zone 3, destroyed lobular architecture with bridging necrosis and inflammatory cell infiltration on portal tracts. However, hepatic septal fibrosis with liver cirrhosis has not been reported yet.We experienced a case of hepatic septal fibrosis that developed after 9 months of ketoconazole administration.(Korean J Hepatol 2000;6:241-245)
Kim, Hyeon Joo,Lee, Soyeon,Yun, Hee-Woong,Yin, Xiang Yun,Kim, Soon Hee,Choi, Byung Hyune,Kim, Young Jick,Kim, Moon Suk,Min, Byoung-Hyun TAYLOR FRANCIS 2016 Journal of Biomaterials Science. Polymer Edition Vol.27 No.2
<P>We present a non-invasive fluorescence method for imaging of scaffold degradation in vivo by quantifying the degradation of porcine cartilage-derived extracellular matrix powder (PCP).Three-dimensional porous scaffolds should be biocompatible and bioresorbable, with a controllable degradation and resorption rate to match tissue growth. However, in vivo scaffold degradation and tissue ingrowth processes are not yet fully understood. Unfortunately, current analysis methods require animal sacrifice and scaffold destruction for the quantification of scaffold degradation and cannot monitor the situation in real time. In this study, Cy3, a fluorescent dye, was used for visualizing PCP and a real-time degradation profile was obtained quantitatively by a non-invasive method using an imaging system in which the reduction in fluorescence intensity depended on PCP scaffold degradation. Real-time PCP scaffold degradation was confirmed through changes in the volume and morphology of the scaffold using micro-computed tomography and microscopy. Our results suggest that extracellular matrix degradation was induced by collagen degradation because of the binding between Cy3 and collagen. This non-invasive real-time monitoring system for scaffold degradation will increase our understanding of in vivo matrix and/or scaffold degradation.</P>
HPLC를 이용한 육류중 바이피리딜리움계 제초제 잔류분석
이희수,이혜숙,조병훈,김병용,이광직,이명헌,박은정,김문배,이성모,조준형,박종명,정갑수,김옥경 한국수의공중보건학회 2001 예방수의학회지 Vol.25 No.4
A simultaneous and rapid method for determination of bipyridylium herbicides, paraquat dichloride and diquat dibromide have been developed in meat using high-performance liquid chromatography (HPLC) at UV 255/310nm. It is possible to detect effectively below maximal residue levels (MRL) set in CODEX and Korea with little amount of sample. Based on the collaborative studies in 3 laboratories, the mean of recovery within laboratory repeatability were 108.7%, 93.5% and 105.7%, respectively and the coefficient of variation were 6.9%, 9.8% and 12.1% in paraquat analysis. In case of diquat analysis, the mean of recovery were 86.3%, 87.0% and 86.3%, respectively and the coefficient of variation were 13.2%, 8.9% and 7.6%, respectively of which results would be acceptable to recommended guideline of CODEX. In addition, the coefficient of variation between laboratory repeatability were 7.9% and 9.7% in paraquat and diquat, respectively which would be also acceptable to the guideline of CODEX. In conclusion, the present method which would be equivalent to an official method of analysis makes feasible both for qualified determination in meat and for precise diagnosis of intoxification caused by paraquat and diquat, bipyridylium herbicides.
Park, Do Young,Min, Byoung-Hyun,Choi, Byung Hyune,Kim, Young Jick,Kim, Mijin,Suh-Kim, Haeyoung,Kim, Joon Ho SAGE Publications 2015 AMERICAN JOURNAL OF SPORTS MEDICINE - Vol.43 No.12
<P><B>Background:</B></P><P>Fibrocartilage metaplasia in tendons and ligaments is an adaptation to compression as well as a pathological feature during degeneration. Medial meniscus posterior roots are unique ligaments that resist multidirectional forces, including compression.</P><P><B>Purpose:</B></P><P>To characterize the degeneration of medial meniscus posterior root tears in osteoarthritic knees, with an emphasis on fibrocartilage and calcification.</P><P><B>Study Design:</B></P><P>Cross-sectional study; Level of evidence, 3.</P><P><B>Methods:</B></P><P>Samples of medial meniscus posterior roots were harvested from cadaveric specimens and patients during knee replacement surgery and grouped as follows: normal reference, no tear, partial tear, and complete tear. Degeneration was analyzed with histology, immunohistochemistry, and real-time polymerase chain reaction. Uniaxial tensile tests were performed on specimens with and without fibrocartilage. Quantifiable data were statistically analyzed by the Kruskal-Wallis test with the Dunn comparison test.</P><P><B>Results:</B></P><P>Thirty, 28, and 42 samples harvested from 99 patients were allocated into the no tear, partial tear, and complete tear groups, respectively. Mean modified Bonar tendinopathy scores for each group were 3.97, 9.31, and 14.15, respectively, showing a higher degree of degeneration associated with the extent of the tear (<I>P</I> < .05 for all groups). The characterization of root matrices revealed an increase in fibrocartilage according to the extent of the tear. Tear margins revealed fibrocartilage in 59.3% of partial tear samples and 76.2% of complete tear samples, with a distinctive cleavage-like shape. Root tears with a similar shape were induced within fibrocartilaginous areas during uniaxial tensile testing. Even in the no tear group, 56.7% of samples showed fibrocartilage in the anterior margin of the root, adjacent to the meniscus. An increased stained area of calcification and expression of the ectonucleotide pyrophosphatase/phosphodiesterase 1 gene were observed in the complete tear group compared with the no tear group (<I>P</I> < .0001 and <I>P</I> = .24, respectively).</P><P><B>Conclusion:</B></P><P>Fibrocartilage and calcification increased in medial meniscus posterior roots, associated with the degree of the tear. Both findings, which impair the ligament’s resistance to tension, may play a pivotal role during the pathogenesis of degenerative meniscus root tears in osteoarthritic knees. Fibrocartilage and calcification may be useful as diagnostic markers as well as markers of degeneration, which may aid in determining the treatment modality in meniscus root tears. The presence of fibrocartilage in intact roots may suggest an impending tear in osteoarthritic knees.</P>
Prediction of skin penetration of Bifenthrin using in vitro micro-pig skin model
Ji-Hyun Bang(Ji-Hyun Bang),Hyun-Ok Ku(Hyun-Ok Ku),Byung-Suk Jeon(Byung-Suk Jeon),Hyobi Kim(Hyobi Kim),Kwang-Jick Lee(Kwang-Jick Lee),Yong-Sang Kim(Yong-Sang Kim),Hee Yi(Hee Yi) 한국예방수의학회 2019 한국예방수의학회 학술대회자료집 Vol.2018 No.-