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A Constrained Optimization Approach to The Control of Inverters: Beyond the PWM Technique
Kang-Zhi Liu 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
In this paper, a constrained optimization based approach is proposed for the switching control of inverters. This method achieves the best tracking performance of three phase currents, or equivalently the best tracking of torque command. This approach may be viewed as an improved SVM (space vector modulation) method. Detailed performance analysis and simulation prove that in the overmodulation region, a relative ratio of improvement up to 1/√3 and an absolute improvement up to E R (1 ?e?RTL ) are achieved over SVM. Meanwhile, the computation complexity is the same as SVM.
Kang, Kyoung Ah,Wang, Zhi Hong,Zhang, Rui,Piao, Mei Jing,Kim, Ki Cheon,Kang, Sam Sik,Kim, Young Woo,Lee, Jongsung,Park, Deokhoon,Hyun, Jin Won Molecular Diversity Preservation International (MD 2010 INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES Vol.11 No.11
<P>Recently, we demonstrated that myricetin exhibits cytoprotective effects against H<SUB>2</SUB>O<SUB>2</SUB>-induced cell damage via its antioxidant properties. In the present study, myricetin was found to inhibit H<SUB>2</SUB>O<SUB>2</SUB>-induced apoptosis in Chinese hamster lung fibroblast (V79-4) cells, as shown by decreased apoptotic bodies, nuclear fragmentation, sub-G<SUB>1</SUB> cell population, and disruption of mitochondrial membrane potential (Δψ<I><SUB>m</SUB></I>), which are increased in H<SUB>2</SUB>O<SUB>2</SUB>-treated cells. Western blot data showed that in H<SUB>2</SUB>O<SUB>2</SUB>-treated cells, myricetin increased the level of Bcl-2, which is an anti-apoptotic factor, and decreased the levels of Bax, active caspase-9 and -3, which are pro-apoptotic factors. And myricetin inhibited release of cytochrome c from mitochondria to cytosol in H<SUB>2</SUB>O<SUB>2</SUB>-treated cells. Myricetin-induced survival correlated with Akt activity, and the rescue of cells by myricetin treatment against H<SUB>2</SUB>O<SUB>2</SUB>-induced apoptosis was inhibited by the specific PI3K (phosphoinositol-3-kinase) inhibitor. Myricetin-mediated survival also inhibited the activation of p38 mitogen activated protein kinase (MAPK) and c-Jun <I>N</I>-terminal kinase (JNK), which are members of MAPK. Our studies suggest that myricetin prevents oxidative stress-induced apoptosis via regulation of PI3K/Akt and MAPK signaling pathways.</P>
Kang Zhi‐Wei,Liu Fang‐Hua,Xu Yong‐Yu,Cheng Jia‐Hui,Lin Xiao‐Li,Jing Xiang‐Feng,Tian Hong‐Gang,Liu Tong‐Xian 한국곤충학회 2021 Entomological Research Vol.51 No.1
Odorant‐degrading enzymes (ODEs) have been found in insect antennae and play a critical role in signal chemical degradation once the message is conveyed. Significant progress has been made in characterizing ODEs in a variety of pests but very little is known in their natural enemies. We have carried out an antennae‐ and sex‐specific transcriptome of Aphidius gifuensis, a natural enemy of aphid, to identify the candidate ODEs. Based on the antennae‐ and sex‐specific transcriptome, a total of 100 putative ODEs were identified including one aldehyde oxidase (AOX), four alcohol dehydrogenases (ADs), eight UDP‐glucuronosyltransferases (UGTs), 45 cytochrome P450 (P450s), nine glutathione S‐transferases (GSTs) and 40 carboxylesterases (CCEs or CXEs). Additionally, we used RT‐qPCR to determine the expression profiles of these genes in tissues of both sexes. Based on the phylogenic analysis and tissue‐expression patterns, AgifEstE4, AgifCXE3, AgifCCE4, AgifCCE7, and AgifCCE18 were suggested as key ODEs in A. gifuensis. In addition, the female or male specifically enriched genes, such as AgifCCE17, AgifEstB1, AgifCYP18a1, AgifUGT2C2, were also considered to involve in the chemosensory processing in A. gifuensis. This study not only identified the candidate ODEs in A. gifuensis but also provided source for further exploration of the molecular mechanisms of chemical signal transductions in A. gifuensis, as well as other hymenopteran species.
중국의 지역균형발전 정책 진행과정 및 효과분석 -서부대개발 정책을 중심으로-
장강지 ( Kang Zhi Zhang ),서운석 ( Woon Seok Suh ) 한중사회과학학회 2005 한중사회과학연구 Vol.5 No.-
The ``Two Strategies`` of developing the eastern areas and then western a reas in the construction of modernization of China is the theoretical basis for implementing China`s modernization which is the aim of the third strategy in implementing China`s modernization and is critical in the overall construction of well-off society. But during the past 20 years, No matter what the contributions it made to the development of Chinese regional eco nomy at that time, it all wanted to produce effects as soon as possible by spill-over but it has sharpened the contradictions between regions and made the structure of economic development fall into serious unbalance. Regional development policy is to transform from non-equilibrium development to re-equilibrium one by implementing new regional development strategy. Developing the western china is a long term, arduous and very comp licated social systematic project. In this article we have analyzed the effects of the Western development policy. According to this result, the effects of the Western development policy is not satisfactory and the contradictions between Eastern and Western made more serious.