http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Khoi, Pham Ngoc,Xia, Yong,Lian, Sen,Kim, Ho Dong,Kim, Do Hyun,Joo, Young Eun,Chay, Kee-Oh,Kim, Kyung Keun,Jung, Young Do Lychnia 2014 International journal of oncology Vol.45 No.4
<P>Cadmium exposure has been linked to human cancers, including stomach cancer. In this study, the effects of cadmium on urokinase-type plasminogen activator receptor (uPAR) expression in human gastric cancer cells and the underlying signal transduction pathways were investigated. Cadmium induced uPAR expression in a time- and concentration-dependent manner. Cadmium also induced uPAR promoter activity. Additionally, cadmium induced the activation of extracellular signal regulated kinase-1/2 (ERK-1/2), p38 mitogen-activated protein kinase (MAPK), and the activation of c-Jun amino terminal kinase (JNK). A specific inhibitor of MEK-1 (PD98059) inhibited cadmium-induced uPAR expression, while JNK and p38 MAPK inhibitors did not. Expression vectors encoding dominant-negative MEK-1 (pMCL-K97M) also prevented cadmium-induced uPAR promoter activity. Site-directed mutagenesis and electrophoretic mobility shift studies showed that sites for the transcription factors nuclear factor (NF)-kappa B and activator protein-1 (AP-1) were involved in cadmium-induced uPAR transcription. Suppression of the cadmium-induced uPAR promoter activity by a mutated-type NF-kappa B-indncing kinase and I-kappa B and an AP-1 decoy oligonucleotide confirmed that the activation of NF-kappa B and AP-1 are essential for cadmium-induced uPAR upregulation. Cells pretreated with cadmium showed markedly enhanced invasiveness and this effect was partially abrogated by uPAR-neutralizing antibodies and by inhibitors of ERK-1/2, NF-kappa B, and AP-1. These results suggest that cadmium induces uPAR expression via ERK-1/2, NF-kappa B, and AP-1 signaling pathways and, in turn, stimulates cell invasiveness in human gastric cancer AGS cells.</P>
SETS OF UNIQUENESS, WEAKLY SUFFICIENT SETS AND SAMPLING SETS FOR A-∞(B)
Khoi, Le Hai Korean Mathematical Society 2010 대한수학회보 Vol.47 No.5
We study a relationship between sets of uniqueness, weakly sufficient sets and sampling sets in the space $A^{-{\infty}}(\mathbb{B})$ of holomorphic functions with polynomial growth on the unit ball of $\mathbb{C}^n$ ($n\;{\geq}\;1$).
On Engel quasi-normal subgroup in division rings with uncountable center
Khoi Minh Nguyen-Duy 대한수학회 2020 대한수학회논문집 Vol.35 No.4
The aim of this paper is to show that every Engel quasi-normal subgroups of the unit group of a division ring with uncountable center is central.
Linear Quadrotor Modelling and Attitude Controller Design Based On Experimental Data
Khoi Nguyen Dang,Gigun Lee,Taesam Kang 제어로봇시스템학회 2015 제어로봇시스템학회 국제학술대회 논문집 Vol.2015 No.10
This paper presents a method to model and optimize controller design for quadrotor system. The linearized quadrotor model is derived from system identification method which is based on collected experimental data. After obtaining quadrotor model, the project moves on to design an optimal controller. For that purpose of obtaining the optimal controller design, LQ Servo design, which is basically developed from LQR theory, is considered. The designed LQ Servo, then, is applied back to the quadrotor system to ensure getting the best performance and most suitable mathematical model of quadrotor system.
Current Control Scheme of High Speed SRM Using Low Resolution Encoder
Khoi, Huynh Khac Minh,Ahn, Jin-Woo,Lee, Dong-Hee The Korean Institute of Power Electronics 2011 JOURNAL OF POWER ELECTRONICS Vol.11 No.4
This paper presents a balanced soft-chopping circuit and a modified PI controller for a high speed 4/2 Switched Reluctance Motor (SRM) with a 16 pulse per revolution encoder. The proposed balanced soft-chopping circuit can supply double the switching frequency in the fixed switching frequency of power devices to reduce current ripple. The modified PI controller uses maximum voltage, back-emf voltage and PI control modes to overcome the over-shoot current due to the time delay effect of current sensing. The maximum voltage mode can supply a fast excitation current with consideration of the hardware time delay. Then the back-emf voltage mode can suppress the current over-shoot with consideration of the feedback signal delay. Finally, the PI control mode can adjust the phase current to a desired value with a fast switching frequency due to the proposed balanced soft-chopping technology.