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A MULTIPLICITY RESULT FOR FOURTH-ORDER BOUNDARY VALUE PROBLEMS VIA CRITICAL POINTS THEOREM
Yu-mei Zou 한국전산응용수학회 2011 Journal of applied mathematics & informatics Vol.29 No.5
In this paper, using B.Ricceri's three critical points theorem,we prove the existence of at least three classical solutions for the problem u^(4)(t) = λf(t, u(t)), t ∈ (0, 1),u(0) = u(1) = u'(0) = u'(1) = 0,under appropriate hypotheses.
Inhibition of Microcystis aeruginosa by the Extracellular Substances from an Aeromonas sp
( Yu Mei Liu ),( Ming Jun Chen ),( Meng Hui Wang1 ),( Rui Bao Jia ),( Li Li ) 한국미생물 · 생명공학회 2013 Journal of microbiology and biotechnology Vol.23 No.9
Growth of Microcystis aeruginosa could be inhibited significantly within 24 h by the extracellular substances prepared from Aeromonas sp. strain FM. During the treatment, the concentration of extracellular soluble carbohydrates increased significantly in algal culture. Morphological and ultrastructural changes in M. aeruginosa cells, including breakage of the cell surface, secretion of mucilage, and intracellular disorganization of thylakoids, were observed. HPLC-MS analysis showed that the extracellular substances of Aeromonas sp. strain FM were a mixture of free amino acids, tripeptides, and clavulanate. Among these, the algaelysis effects of lysine and clavulanate were confirmed.
Mei-yu Lv,Kai-yu Liu,Yan Li,Lai Wei,Jian-jian Zhong,Geng Su 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.5
A three-dimensional (3D) Co3O4/mildly oxidized multiwalled carbon nanotubes (moCNTs)/reduced mildly oxidized graphene oxide (rmGO) ternary composite was prepared via a simple and green hydrolysishydrothermal approach by mixing Co(Ac)2·4H2O with moCNTs and mGO suspension in mixed ethanol/H2O. As characterized by scanning electron microscopy and transmission electron microscopy, Co3O4 nanoparticles with size of 20-100 nm and moCNTs are effectively anchored in mGO. Cyclic voltammetry and galvanostatic charge-discharge measurements were adopted to investigate the electrochemical properties of Co3O4/moCNTs/ rmGO ternary composite in 6 M KOH solution. In a potential window of 0-0.6 V vs. Hg/HgO, the composite delivers an initial specific capacitance of 492 F g−1 at 0.5 A g−1 and the capacitance remains 592 F g−1 after 2000 cycles, while the pure Co3O4 shows obviously capacitance fading, indicating that rmGO and moCNTs greatly enhance the electrochemical performance of Co3O4.
Yu-Sheng Liu,Qing-Hua Lu,Xiao-Bo Hu,Hong-Zhuan Li,Wei-Dong Jiang,Xin Wang,Hao Lin,Ai-Qiong Qin,Yong-Mei Wang,Tong Zhao,Zhao-Qiang Dong,Mei Zhang 연세대학교의과대학 2011 Yonsei medical journal Vol.52 No.6
Purpose: Lipoprotein-associated phospholipase A2 (Lp-PLA_2) is an inflammatory enzyme expressed in atherosclerotic plaques. We investigated the association of circulating Lp-PLA_2 with characteristics of vulnerable coronary atherosclerotic plaques. Materials and Methods: We recruited 113 patients with either unstable angina (UA, n=59) and stable angina (SA, n=54) by coronary angiography. Thirty-six healthy subjects served as controls. Intravascular ultrasound (IVUS) was used to evaluate the characteristics of coronary atherosclerotic plaque, and serum Lp-PLA2 concentration was measured as well. Results: Lp-PLA_2 concentration was significantly higher in both UA and SA patients [(396±36) μg/L and (321±39) μg/L, respectively]compared with the controls [(127±49) μg/L, p<0.01], and higher in UA than SA group. IVUS findings showed that remodeling index (RI) (0.91±0.15 vs. 0.85±0.11, p=0.005) and eccentricity index (EI) (0.73±0.16 vs. 0.65±0.22, p=0.039) were larger in UA than in SA group, and fibrous caps were thicker in SA than UA group [(0.91±0.23) mm vs. (0.63±0.21) mm, p=0.032]. Moreover, Lp-PLA_2 correlated positively with EI (r=0.439, p<0.01) and RI (r=0.592, p<0.05) in UA group. There was an inverse relationship between Lp-PLA_2 and fibrous cap thickness in both UA (r=-0.587, p<0.001) and SA (r=-0.318, p<0.05) groups. The independent risk factors in UA group were Lp-PLA_2 (OR=1.055, 95% CI: 1.03-1.08, p=0.013), LDL-cholesterol (OR=0.032, 95% CI: 0.00-0.05, p=0.041) and fibrous cap thickness (OR=0.008, 95% CI: 0.00-0.45, p=0.019). Lp-PLA_2 was strongly associated with both EI and fibrous cap thickness in both groups. Conclusion: Serum level of Lp-PLA_2 is associated with both eccentricity index and fibrous cap thickness in both UA and SA groups. Elevated levels of circulating Lp-PLA_2 might to be a strong risk factor and more serious for unstable angina than stable angina.
Genotoxicity Test on 3,9-Diferuloyl-6-oxopterocarpen, a New Agent Candidate for Anti-aging Material
Yu-Ri Jung,Sung-Min Park,Nam-Jin Lee,Hyeong-Bae Pyo,Geun Soo Kim,Jong-Hun You,Chun-Mei Lin,Zheng Mei Shu,Jong-Koo Kang 한국실험동물학회 2008 Laboratory Animal Research Vol.24 No.1
To perform the safety studies on 3,9-diferuloyl-6-oxopterocarpen (DFO), we accomplished the reverse mutation assay in Salmonella typhimurium and Escherichia coli, in vitro chromosomal aberration assay on Chinese hamster lung cell and in vivo bone marrow micronucleus test in male ICR mice. In the reverse mutation assay, this material treatment at the dose range up to 5,000 ㎍/plate did not induce mutagenicity in Salmonella typhimurium TA98, TA100, TA1535, TA1537 and in Escherichia coli WP2uvrA-with and without metabolic activation. In the in vitro chromosomal aberration assay, this material did not increase the number of cells having structural or numerical chromosome aberration. In the in vivo bone marrow micronucleus assay, no significant increase in the occurrence of micronucleated polychromatic erythrocytes was observed in male ICR mice administered this material. In conclusion, we suggested that DFO have no genotoxicity in reverse mutation assay, in vitro chromosomal aberration assay and in vivo bone marrow micronucleus test.
Quantized Output Feedback Control of Networked Control Systems with Packet Dropout
Mei Yu,Shuang Bai,Ting Yang,Jianhua Zhang 제어·로봇·시스템학회 2018 International Journal of Control, Automation, and Vol.16 No.5
This paper considers the quantized dynamic output feedback control of networked control system(NCS) with random packet dropout in both sensor-to-controller and controller-to-actuator channels. The packet losses in the two links are modeled as two independent Markov chains and the NCS is modeled as a Markov jump system. The stochastic switching signal for the quantized output feedback controller is designed to be a function of the number of successive packet loss in both of the two channels. Quantization density varies with the networked load condition. Then a sufficient condition of the stochastic stability with a prescribed H¥ performance level is established based on the Lyapunov-Krasovskii function approach. Furthermore, a quantized output feedback controller is obtained via the cone complement linearization method. Finally, simulation results are provided to verify the effectiveness of the proposed method.
Yu-Mei Li 대한약학회 2013 Archives of Pharmacal Research Vol.36 No.11
A method of simultaneous determination offive flavonoids during the growth of Fructus Sophorae byb-cyclodextrin (b-CD-) modified capillary zone electrophoresiswas developed. The effects of various parameterssuch as buffer concentration, pH, applied voltage, andb-CD concentrations were investigated. After a series ofoptimization processes, the determination of five flavonoidsin Fructus Sophorae was successfully achieved in20 mmol/L borax buffer (pH 9.5), 25 kV applied voltage,and 8 mmol/L b-CD. The linearity, detection limits,repeatability, and recovery were satisfactory. Thus, theproposed b-CD-modified capillary zone electrophoresismethod was satisfactorily used to analyze Fructus Sophoraesamples. The results can be useful for the quality controland medicinal resource development of Fructus Sophorae.