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손진언,이영식,김상구,류동춘,정종문,류재익 동아대학교 환경문제연구소 1995 硏究報告 Vol.18 No.1
Environmental factors of Quality were Temperature, pH, DO, COD, NH₄^(+)-N, No₂^(-)-N, NO₃^(-)-N, PO₄^(3-)-P, transparency and Chl-a. The values range were 3.3-31℃, 7.0-9.3, 8.0-16.8mg/l, 2.9-6.5mg/l, 0.0l-0.8mg/l, 0.0l-0.15mg/l, 0.8-3.7mg/1, 0.01-0.l7mg/l, 0.5-2.0m, 3.1-49.8mg/l, respectively. The phytoplankton are identified as 170taxa, and the order of appearing frequency is as following; Chlorophyceae, Bacillaripphyceae, Cyanophyceae, Chrysophyceae, Euglenophyceae, Dinophyceae. The causative species of red tide were identified as Microcystis aeruginosa, Trachellomonas hispida, Ceratium hirundinella,' Peridinium, Melosira italica, Staurastrum dorsidentiferum var. ornatum. Minimum Standing crops of algae cell was 728 cell/ml at point 4 on December and Maximum Standing crops of algae cell was 4.68×106 cell/ml at point 2 on August. Dominance species are Cyclotella glomerata and Microcystis aeruginosa during winter to spring season and summer to autumn.
서울의 Penicillinase Producing Neisseria gonorrhoeae 발생빈도(1998)
김재홍,김준호,반재용,이정우,황성주,정준규,정성태,강진문,조흔정,홍창의,정혜신,이한승,김이선,이봉길,이종호,선영우,한기덕,윤성필,이성훈,안종성,박석범,문승현,조항래,김형섭,류지호,황재영,박준홍,손상욱 한양대학교 의과대학 2001 한양의대 학술지 Vol.21 No.1
In recent years, gonorrhea has been pandemic and remains one of the most common STDs in the world, especially in developing countries. For the detection of a more effective therapeutic regimen and assessing the prevalence of Penicillinase Producing Neisseria gonorrhoeae(PPNG), we have been trying to study the patients who have visited the Venereal Disease Clinic of Choong-Ku Public Health Center in Seoul since 1980 by menas of the chromogenic cephalosporin method. In 1998, 93 strians of N. genorrhoeae were isolated, among which 60(64.5%) were PPNG. The prevalence of PPNG in Seoul, which had been decreased to 39% in 1996 after a peak of 74.3% in 1993, is increased to 64.5% in 1998.
Impact Analysis of Fiber-reinforced Composites Based on Elasto-plastic Constitutive Law
Joo, Ki Ho,Ryou, Hansun,Chung, Kwansoo,Kang, Tae Jin Sage Publications 2007 Journal of composite materials Vol.41 No.25
<P>Impact analysis of 3D braided composites and laminated plane woven fabric composites was performed using the elasto-plastic constitutive law to describe the nonlinear, anisotropic and asymmetric properties of fiber-reinforced composites. As for the yield criterion, the modified DruckerU2014;Prager yield criterion was utilized to represent the anisotropic and asymmetric properties, while the anisotropic hardening was described based on the kinematic hardening with the anisotropic evolution of the back-stress. Experiments to obtain the material parameters of the proposed constitutive law were also carried out based on uni-axial tension and compression tests for fiber-reinforced composites. Then, the proposed constitutive law was implemented into a finite element code and was verified by comparing the finite element simulation of the impact tests with experiments. In addition, impact performance of the braided composites and laminated composites was also compared with each other.</P>
Kim, Ji Hoon,Ryou, Hansun,Lee, Myoung-Gyu,Chung, Kwansoo,Youn, Jae Ryoun,Kang, Tae Jin Society of Plastics Engineers 2007 Polymer composites Vol.28 No.6
<P>Micromechanical modeling to calculate the mechanical properties of fiber reinforced composites is proposed. To describe the mechanical behavior of the yarn and the matrix, which are the main constituents of fiber reinforced composites, the elastoplastic constitutive law was adopted. In particular, anisotropic elastoplasticity based on Hill's orthotropic yield function and anisotropic kinematic hardening was utilized for the yarn, while the isotropic elastoplastic constitutive law was applied for the matrix. The effective properties of the unit cell in fiber reinforced composites were then calculated based on the finite element method. For verification, the method was successfully applied for 3D braided glass/Kevlar fiber reinforced composites in both linear elastic and nonlinear inelastic ranges. POLYM. COMPOS., 28:722–732, 2007. © 2007 Society of Plastics Engineers</P>
Lee Myoung-Gyu,Kim Ji-Hoon,Ryou Han-Sun,Chung Kwan-Soo,Youn Jae-Ryoun,Kang Tae-Jin The Korean Fiber Society 2006 Fibers and polymers Vol.7 No.3
Development and numerical implementation for an elastoplastic constitutive model for anisotropic and asymmetric materials are presented in this paper. The Coulomb-Mohr yield criterion was modified to consider both the anisotropic and asymmetric properties. The modified yield criterion is an isotropic function of the principal values of a symmetric matrix which is linearly transformed from the Cauchy stress space. In addition to the constitutive equation, the numerical treatment for the singularity in the vertex region of yield surface and stress integration algorithm based on elastoplasticity were presented. In order to assess the accuracy of numerical algorithm, isoerror maps were considered. Also, extension of a strip with a circular hole was simulated and results compared with those obtained using the (smooth) Mises yield criterion to validate stress output for a complex stress state.
Cho, Du-Hyong,Choi, Yoon Jung,Jo, Sangmee Ahn,Ryou, Jungsang,Kim, Jin Yi,Chung, Jongkyeong,Jo, Inho American Physiological Society 2006 American journal of physiology. Cell physiology Vol.291 No.2
<P>Thiazolidinediones (TZDs), synthetic peroxisome proliferator-activated receptor gamma (PPARgamma) ligands, have been implicated in the inhibition of protein synthesis in a variety of cells, but the underlying mechanisms remain obscure. We report that troglitazone, the first TZD drug, acutely inhibited protein synthesis by decreasing p70 S6 kinase (p70S6K) activity in bovine aortic endothelial cells (BAEC). This inhibition was not accompanied by decreased phosphorylation status or in vitro kinase activity of mammalian target of rapamycin (mTOR). Furthermore, cotreatment with rapamycin, a specific mTOR inhibitor, and troglitazone additively inhibited both p70S6K activity and protein synthesis, suggesting that the inhibitory effects of troglitazone are not mediated by mTOR. Overexpression of the wild-type p70S6K gene significantly reversed the troglitazone-induced inhibition of protein synthesis, indicating an important role of p70S6K. Okadaic acid, a protein phosphatase 2A (PP2A) inhibitor, partially reversed the troglitazone-induced inhibition of p70S6K activity and protein synthesis. Although troglitazone did not alter total cellular PP2A activity, it increased the physical association between p70S6K and PP2A, suggesting an underlying molecular mechanism. GW9662, a PPARgamma antagonist, did not alter any of the observed inhibitory effects. Finally, we also found that the mTOR-independent inhibitory mechanism of troglitazone holds for the TZDs ciglitazone, pioglitazone, and rosiglitazone, in BAEC and other types of endothelial cells tested. In conclusion, our data demonstrate for the first time that troglitazone (and perhaps other TZDs) acutely decreases p70S6K activity through a PP2A-dependent mechanism that is independent of mTOR and PPARgamma, leading to the inhibition of protein synthesis in endothelial cells.</P>