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유철로,김홍규,이공희,이성룡 全北大學校 1992 論文集 Vol.34 No.-
A new multiple current source inverter for reducing the harmonics in output current is presented in this study. Condenser capacity necessary for the inverter design is decided by the commutation analysis of current source inverter with induction motor as load. And the proposed system operates 24 phase inverter by adding only tap changing circuit which consists of several taps and static switching elements to the 12 phase inverter, which is the double connected 6 phase inverter with an interphase reactor. Also to optimize the effectiveness of the harmonic reduction, the optimum turn ratio and tap changing control angle of interphase reactor are decided by digital simulation and its validity is verified with experiment. And under the optimum condition, it is clarified that the harmonics components involved in the output currents of the proposed inverter are nearly equal to those of the conventional 24 pulse inverter.
Preparation and properties of cement based piezoelectric composites modified by CNTs
Hong-Yu Gong,Yu-Jun Zhang,Jing Quan,Songwei Che 한국물리학회 2011 Current Applied Physics Vol.11 No.3
In this study, cement based piezoelectric composites have been prepared from Portland cement with the addition of 70 vol.% of PZT powders and various amounts of modified CNTs ranging from 0 to 1.3 vol.%. The CNTs act as a conductive filler dispersed in the cement matrix, improving the poling efficiency of the composites and enabling the poling process to be carried out at room temperature, in contrast to the 120 ℃ required for the PZT/cement composites without CNTs. The addition of CNTs significantly enhanced the piezoelectric properties of the composites. With a CNT content of 0.3 vol.%, the CNTs/PZT/cement composite showed the highest piezoelectric strain factors (d_33) of 62 pC/N and piezoelectric voltage factors (g_33) 60 × 10^-3 Vm/N, which are the promising characteristics for its potential use in the smart civil engineering structures.
세라믹 연삭에서 결합제에 따른 다이아몬드 휠의 마멸 특성
공재향,유봉환,소의열,이근상,유은이,임홍섭 한국공작기계학회 2002 한국생산제조학회지 Vol.11 No.4
In this study, experiments were carried out to investigate the characteristics of grinding and wear process of diamond wheel during grinding ceramic materials. Normal component of grinding resistance was decreasing while increased of spindle speed. The resistance of vitrified bond wheel was less than that of resinoid bond wheel because of imbedded large holes on the surface of cutting edge. Surface roughness was decreasing while of spindle speed. The surface roughness using vitrified bond wheel was less than that of resinoid bond wheel because of small elastic deformation. After continuous grinding of ceramics, cutting edge ratio of resinoid bond wheel decreased. For the case of vitrified bond wheel, cutting edge ration did not change.
Hong-Man Hou,Dong-Qi Guo,Gong-Liang Zhang,Li-Ming Sun,Yu-Na Cui 한국응용생명화학회 2014 Applied Biological Chemistry (Appl Biol Chem) Vol.57 No.5
Cholesterol-lowering effect of lactic acid bacteria iswell-known. In the present study, nine cholesterol-loweringLactobacillus strains from Chinese traditional cheese, pickle, andyoghurt were screened and characterized for their potential use. The microbial contents of all strains significantly decreased at pH1.5; however, the residual counts of Lactobacillus casei subsp. casei GL-03, L. plantarum ZP-Z, L. plantarum ZP-05, and L. brevis ZP-04 were more than 107 CFU/mL after incubation for 6h. All nine strains of Lactobacillus indicated good tolerance to bileat concentration less than 0.2% after incubation for 2 to 6 h. L. plantarum ZP-W had maximum hydrophobicity towards xylene,whereas GL-03 strain possessed maximum hydrophobicity forboth hexadecane and octane. ZP-05 strain had more effectiveinhibitory activity against both Staphylococcus aureus and Bacillussubtilis than other eight strains. Furthermore, GL-03 strainsignificantly reduced cholesterol TC and TG levels in hyperlipidemiamice fed high-cholesterol diet. The growth of GL-03 strain waspromoted by five kinds of Chinese herbal medicines, and theChinese hawthorn at concentration of 0.0125% showed thehighest promoting effect. These results suggest that L. casei subsp. casei GL-03 may be effective as a probiotic with cholesterollowingactivities.
Lan Hong,Guo-Hua Gong,Li Yu,Ming-Xia Song,Xun Cui,Zhe-Shan Quan 대한약학회 2013 Archives of Pharmacal Research Vol.36 No.11
A series of 7-alkoxy-4,5-dihydro-[1,2,4]oxadiazolo[4,3-a]quinolin-1-ones was synthesized and theirnegative inotropic effects were evaluated by measuring theleft atrium stroke volume in isolated rabbit heart preparations. All compounds moderated the cardiac workload bydecreasing heart rate and contractility (inotropic effects). Among them, compound 6 was found to be best potent witha -28.89 ± 1.91 % decrease in the stroke volume at aconcentration of 3 9 10-5 M in our in vitro study.
Expression of Endogenous Hypoxia Markers in Vulvar Squamous Cell Carcinoma
Li, Yu-Zhu,Li, Shu-Ling,Li, Xia,Wang, Li-Jie,Wang, Jiu-Ling,Xu, Jia-Wen,Wu, Zhi-Hong,Gong, Li,Zhang, Xiao-Dan Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.8
Objective: To investigate the expression of endogenous hypoxia-related markers identified as being involved in vulvar squamous cell carcinoma (VSCC). Methods: We performed immunohistochemical staining of hypoxia-inducible factor-$1{\alpha}$ (HIF-$1{\alpha}$), glucose transporter-1 (GLUT-1), carbonic anhydrase 9 (CA-9) and vascular endothelial growth factor (VEGF), on tissue sections of 25 VSCC patients, 10 vulvar intraepithelial neoplasia (VIN) patients and 12 healthy controls. Results: HIF-$1{\alpha}$ expression was found in all sections, with no significant difference between controls, VIN and VSCC sections (all P<0.05). Glut-1 expression was found in 25% of control, 90% of VIN and 100% of VSCC sections. A significant difference between control and VIN or VSCC was observed (all P<0.05), while no difference was found between VIN and VSCC sections (P>0.05). CA-9 expression was negative in control sections, but it was found in 30% of VIN sections and 52% of VSCC sections with strong staining. Similarly, CA-9 expression also showed obvious differences between controls and VIN or VSCC sections (all P<0.05). However, there was no significant difference between VIN and VSCC (P>0.05). There were only 25% of control sections with weak VEGF expression, while strong staining was found in about 60% of VIN sections and 25% of VSCC sections (all P<0.05). In addition, a difference was also found between VIN and VSCC sections (P<0.05). Conclusion: Expression of endogenous hypoxia markers (HIF-$1{\alpha}$, GLUT-1, CA-9 and VEGF) might be involved in the malignant progression of VSCC.