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외란봉사기를 이용한 연구자석 동기전동기에 대한 참조모델 견실적응제어기의 성능개선
金弘哲(Hong-Zhe Jin),林勳(Hoon Lim),李章明(Jang-Myung Lee) 대한전기학회 2008 전기학회논문지 Vol.57 No.5
A simple RMRAC (Robust Model Reference Adaptive Control) scheme for the PMSM (Permanent Magnent Synchronous Motor) is proposed in the synchronous frame. A current control of PMSM is the most inner loop of electro-mechanical driving systems and it requires a fast and simple control law to play a foundation role in the control hierarchy. In the proposed synchronous current model, the input signal is composed of a calculated voltage by proposed adaptive laws and real system disturbance. The gains of feed-forward and feedback controllers are estimated by the proposed modified Gradient method respectively, where the system disturbances are assumed as filtered current tracking errors. After the estimation of the system disturbances from the tracking errors, the corresponding voltage is fed forward to control input voltage to compensate for the disturbances. The proposed method is robust against high frequency disturbance and has a fast dynamic response. It also shows a good real-time performance due to it's simplicity of control structure. Through the simulations and real experiments, efficiency of the proposed method is verified.
Lee, Hong-Gu,Yin, Jin-Long,Xu, Cheng-Xiong,Hong, Zhong-Shan,Lee, Zhe-Hu,Jin, Yong-Cheng,Choi, Chang-Weon,Lee, Do-Hyeung,Kim, Kyoung-Hoon,Choi, Yun-Jaie Asian Australasian Association of Animal Productio 2011 Animal Bioscience Vol.24 No.12
This study was conducted to examine the effects of glucose, chromium picolinate (CrP), and vitamin C (Vit C) on lipid metabolism in Korean native steers fitted with indwelling catheters. A total of 12 Korean native steers were randomly allocated to the following treatments: 1) normal control diet, 2) same as 1) +250 g of glucose by intravenous (IV) infusion, 3) same as 2)+13.5 g CrP administered orally, and 4) same as 3)+2.52 g Vit C by IV infusion. Glucose, Vit C, and CrP treatments were administered for five days. At days 1 and 3, serum insulin was higher in treated animals than in those fed the control diet (p<0.05). Serum non-esterified fatty acid (NEFA) concentration in the steers on treatment 2), control+13.5 g CrP, was lower than those on other treatments at 90 min post-infusion on days 1 and 3 (p<0.05). The expression of peroxisome proliferator-activated receptor-${\gamma}$ (PPAR${\gamma}$)2, stearoyl-CoA desaturase-1 (SCD), fatty acid synthase (FAS), and glucose transporter type 4 (Glut 4) in the longissimus muscle of steers on treatment 2 was higher than those on other treatments. In conclusion, the results suggest that CrP is associated with the regulation of gene expression involved in adipogenesis.
보정된 전류동역학에 기반한 영구자석 전동기의 참조모델 강인적응제어기
김홍철(Hong-Zhe Jin),이장명(Jang-Myung Lee) 제어로봇시스템학회 2008 제어·로봇·시스템학회 논문지 Vol.14 No.10
A new RMRAC scheme for the PMSM current regulation is proposed in a synchronous frame, which is completely free from the parameter’s uncertainty. A current regulator of PMSM is the inner most loop of electromechanical driving systems and plays a foundation role in the control hierarchy. When the PMSM runs in high speed, the cross-coupling terms must be compensated precisely for large system BW. In the proposed RMRAC, the input signal is composed of a calculated voltage defined by MRAC law and an output of the disturbance compensator. The gains of feed forward and feedback controller are estimated by the proposed modified gradient method, where the system disturbances are assumed as filtered current regulation errors. After the compensation of the system disturbance from error information, the corresponding voltage is fed forward to control input to compensate for real disturbances. The proposed method robustly compensates the system disturbance and cross-coupling terms. It also shows a good real-time performance due to the simplicity of control structure. Through real experiments, the efficiency of the proposed method is verified.
Choi, Cheol Ung,Rha, Seung-Woon,Chen, Kang-Yin,Jin, Zhe,Minami, Yoshiyasu,Shin, Seung Yong,Na, Jin Oh,Suh, Soon Yong,Lim, Hong Euy,Kim, Jin Won,Kim, Eung Ju,Park, Chang Gyu,Seo, Hong Seog,Oh, Dong Joo Elsevier 2009 Journal of cardiology Vol.54 No.1
<P><B>Summary</B></P><P><B>Background</B></P><P>We compared angiographic and clinical outcomes among different drug-eluting stents (DESs) in Korean acute myocardial infarction (AMI) patients.</P><P><B>Methods</B></P><P>A total of 109 consecutive AMI patients who underwent percutaneous coronary intervention (PCI) with either sirolimus-eluting (SES, <I>n</I>=56 pts) or paclitaxel-eluting stents (PES, <I>n</I>=53 pts) were enrolled from August 2004 to December 2006. The angiographic outcomes at 6 months and clinical outcomes at 1 year were compared between the two groups.</P><P><B>Results</B></P><P>Baseline clinical and procedural characteristics were similar between the two groups. At 6 months, the rate of binary restenosis was 17.0% in the PES group compared with 3.6% in the SES group (<I>p</I>=0.026). Percent restenosis was 24.9±28.6% in the PES group compared with 11.2±17.6% in the SES group (<I>p</I>=0.004). Length of restenosis segment was 3.21±9.02mm in the PES group compared with 0.89±2.38mm in the SES group (<I>p</I>=0.048). Late loss was 0.73±0.89mm in the PES group compared with 0.28±0.37mm in the SES group (<I>p</I>=0.001). However, there were no differences in clinical outcomes at 1 year including mortality, myocardial infarction, repeat PCI, and major cardiac adverse events between two groups.</P><P><B>Conclusion</B></P><P>SES implantation in patients with AMI was associated with reduction in angiographic restenosis at 6 months compared with PES, however, these angiographic benefits were not translated into better clinical outcomes in real world clinical practice.</P>
( Hong Chen Zheng ),( Ming Zhe Sun ),( Ling Cai Meng ),( Hai Sheng Pei ),( Xiu Qing Zhang ),( Zheng Yan ),( Wen Hui Zeng ),( Jing Sheng Zhang ),( Jin Rong Hu ),( Fu Ping Lu ),( Jun She Sun ) 한국미생물 · 생명공학회 2014 Journal of microbiology and biotechnology Vol.24 No.4
High levels of extracellular xylanase activity (211.79 IU/mg) produced by Paenibacillus sp. NF1 were detected when it was submerged-cultured. After three consecutive purification steps using Octyl-Sepharose, Sephadex G75, and Q-Sepharose columns, a thermostable xylanase (XynNF) was purified to homogeneity and showed a molecular mass of 37 kDa according to SDS-PAGE. The specific activity of the purified XynNF was up to 3,081.05 IU/mg with a 14.55-fold purification. The activity of XynNF was stimulated by Ca2+, Ba2+, DTT, and β-mercaptoethanol, but was inhibited by Fe3+, Zn2+, Fe2+, Cu2+, SDS, and EDTA. The purified XynNF displayed a greater affinity for oat spelt xylan with the maximal enzymatic activity at 60°C and pH 6.0. XynNF, which was shown to be cellulose-free, with high stability at high temperature (70°C-80°C) and low pH range (pH 4.0-7.0), is potentially valuable for various industrial applications. The enzyme hydrolyzed oat spelt xylan to yield mainly xylooligosaccharides (95.8%) of 2-4 degree of polymerization (DP2-4). Moreover, the majority of the xylooligosacharides (DP2- 4) products was xylobiose (61.5%). The thermostable xylanase (XynNF) thus seems potentially usefull in the production of xylooligosaccharides.
Zhe-Bin Yu,Die Li,Xue-Yu Chen,Pei-Wen Zheng,Hong-Bo Lin,Meng-Ling Tang,Ming-Juan Jin,Jian-Bing Wang,Kun Chen 대한당뇨병학회 2019 Diabetes and Metabolism Journal Vol.43 No.3
Background: Increasing evidence has shown that visit-to-visit variability (VVV) of blood pressure (BP) is associated with an increased risk of cardiovascular disease (CVD). The objective of this study was to evaluate the impact of VVV of systolic blood pressure (SBP) and diastolic blood pressure (DBP) on the risk of CVD among patients with type 2 diabetes mellitus (T2DM) in China. Methods: We conducted a retrospective cohort study of 10,163 T2DM patients who were not previously diagnosed with CVD from January 2008 to December 2012 in Ningbo, China. The VVV of BP was calculated using five metrics, including standard deviation (SD), coefficient of variation (CV), variation independent of mean, average real variability, and successive variability (SV) of measurements, obtained over a 24-month measurement period. Hazard ratios and 95% confidence intervals (CIs) were estimated by Cox proportional hazards regression models for the associations of variability in BP with risk of CVD. Results: A total of 894 CVD events were observed during a median follow-up of 49.5 months. The hazard ratio in the highest quintile of SD of SBP was 1.24 (95% CI, 1.01 to 1.52) compared with patients in the lowest quintile. The association between higher VVV of DBP and risk of CVD was not consistent across different metrics and sensitivity analyses. Conclusion: Higher VVV of SBP was associated with an increased risk of CVD, irrespective of the mean SBP level. Future studies are needed to confirm these findings.
진병로,안인철,이윤이,길홍량 충남대학교 의과대학 지역사회의학연구소 1999 충남의대잡지 Vol.26 No.1
Congenital heart disease is the most common congenital malformation and its incidence is 8/1000 live birth, and contributes to significant perinatal morbidities and mortalities. With the advancement of echocardiogrphic equipment and technique, it is enable to detect the heart anomalies in utero. We performed 94 fetal (93 mothers) echocardiographic examinaton. 10 confirmed and 3 unconfirmed cardiac anomalies were identified. The common cardiac anomalies were ventricular septal defect(4), tetralogy of Fallot(2), and tricuspid valve regurgitation(2). The common indications of fetal echocardiography were as follows: family history of congenital heart disease(26), suspection by obstericians(24), fetal arrhythmia(13), and other organ anomaly(7). But the relative yield of indication were; suspected by obstericians 33.3%, other organ anomaly 14.3%, family history of congenital heart disease 7.6%, and fetal arrhythmia 7.6%. The false positive result was only 1 case of ventricular septal defect, which was normal in postnatal examination. The mean maternal age was 27years 5months in confirmed cases and 25years 5month s in unconfirmed cases. The fetal echocardiographic study for cardiac anomalies is reliable and accurate method in selected indicated groups, but systematic approach for screening method and identified cardiac anomalies would be needed.
Association of estrogen receptor 1 intron 1 C/T polymorphism in Korean vitiligo patients
Jin, Sheng-Yu,Park, Hyun-Ho,Li, Guang-Zhe,Lee, Hee Jae,Hong, Mee-Suk,Park, Hae-Jeong,Park, Hun-Kuk,Seo, Jung-Chul,Yim, Sung-Vin,Chung, Joo-Ho,Lee, Mu-Hyoung KYUNG HEE UNIVERSITY MEDICAL CENTER 2005 고황의학상 수상논문집 Vol.Vol.21-22 No.-