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Zhang, Chuan-Jin,Tang, Yi,Han, Dong,Zhang, Hui,Zhang, Xiao,Wang, Ke The Korean Institute of Power Electronics 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.3
A novel Virtual Space Vector (VSV) modulation strategy for complete control of potential neutral point (NP) issues is proposed in this paper. The neutral point potential balancing problems of multi-level converters, which include elimination of low frequency oscillations and self-balancing for NP dc unbalance, are investigated first. Then a set of improved virtual space vectors with dynamic adjustment factors are introduced and a multi-objective optimization algorithm which aims to optimize these adjustment factors is presented in this paper. The improved virtual space vectors and the multi-objective optimization algorithm constitute the novel Virtual Space Vector modulation. The proposed novel Virtual Space Vector modulation can simultaneously recover NP dc unbalance and eliminate low frequency oscillations of the neutral point. Experiment results show that the proposed strategy has excellent performance, and that both of the neutral point potential issues can be solved.
Ke Zhang,Vincent Cocquempot,Bin Jiang 제어·로봇·시스템학회 2017 International Journal of Control, Automation, and Vol.15 No.3
This paper addresses an adjustable parameter (AP)-based multi-objective fault estimation design forcontinuous-time/discrete-time dynamic systems. First, a fault estimation observer with AP is constructed to on-lineidentify the size of occurred faults. The fault estimation design not only possesses a wider application comparedwith adaptive observers, but also uses the current output information to enhance fault estimation performance. Then a multi-objective approach is proposed to determine the gain matrices of fault estimation observer. Moreover,fault estimation results with the slack-variable technique are obtained to further reduce the conservatism. Finally,simulation results of an aircraft application are presented to illustrate the effectiveness of our contribution.
Calculation of Vibrational Relaxation Times in Multi-component Excitable Gases
Ke-Sheng Zhang,Weihua Ou,Xueqin Jiang,Fei Long,Mingzhe Hu 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.65 No.7
In the research field of acoustic propagation in excitable gases, one of the most critical parametersis the vibrational relaxation time, which determines the frequency of the acoustic dispersion stepor the absorption maximum. In this paper, the vibrational relaxation equations given by Tanczos[J. Chem. Phys. 25, 439 (1956)] have been applied to calculate the vibrational multi-relaxationtimes in multi-component gases. The eigenvalues of the energy-transition-rate matrix are provento be the reciprocals of the multi-relaxation times. Comparisons demonstrate that our relaxationfrequencies calculated for various gas compositions, including carbon dioxide, methane, chlorine,nitrogen, and oxygen, agree with the experimental data.
Adaptive Observer-based Fast Fault Estimation
Ke Zhang,Bin Jiang,Vincent Cocquempot 제어로봇시스템학회 2008 International Journal of Control, Automation, and Vol.6 No.3
This paper studies the problem of fault estimation using adaptive fault diagnosis observer. A fast adaptive fault estimation (FAFE) approximator is proposed to improve the rapidity of fault estimation. Then based on linear matrix inequality (LMI) technique, a feasible algorithm is explored to solve the designed parameters. Furthermore, an extension to sensor fault case is investigated. Finally, simulation results are presented to illustrate the efficiency of the proposed FAFE methodology.
플라스틱 광섬유를 사용한 통신망에서 OCDMA의 성능 분석
Zhang Ke,서희종 한국전자통신학회 2016 한국전자통신학회 논문지 Vol.11 No.11
In this paper, the performance of the optical code-division multiple access (OCDMA) technology on a plastic optical fiber (POF) access network, which had received much attention due to its low weight, large core diameter, flexibility, easy installation, and especially its high bandwidth, is analyzed. Recently, POF was a very attractive candidate for transmission media in an access network based on OCDMA technology. But the conventional OCDMA system only allows finite units to transmit and access simultaneously according to the number of channels which are restricted by BER, and so, in this paper, to resolve this problem a novel multi-priority reservation protocol is also proposed. By using this reservation scheme and a distributed arbitration algorithm, channel collision and destination conflict could be avoided. And this protocol can efficiently support the transmission of multimedia messages that require the different time-delay. The network throughput and average delay using various system parameters have been investigated by numerical analysis and simulation experiments. These results shows that the multi-priority reservation protocol in this POF access network based on OCDMA technology is valid and efficient. 본 논문은 플라스틱 광섬유(POF)를 연결한 네트워크에서 광 부호분할다중접근(OCDMA)기술의 성능을 분석한다. 최근에 POF는 무게가 가볍고, 중심선의 직경이 크며, 유연하고, 쉽게 설치할 수 있는 특성이 있기 때문에 근래에 POF를 이용한 광전송은 커다란 주목을 받고 있다. 특히 그것의 광대역(broad band) 특성은 OCDMA기술에 기초한 네트워크 연결 전송매체로서 각광을 받고 있다. 일반적인 OCDMA 시스템은 전송로의 수량은 BER특성에 의해서 단지 제한된 단위만 동시에 연결되고 전송할 수 있다. 이러한 문제를 해결하기 위하여 본 논문에서는 새로운 다우선 예약프로토콜을 제안하였다. 이 프로토콜과 분산 조정 알고리듬을 이용하여, 통신로 내부와 목표지로 가는 정보의 충돌을 피할 수 있다. 이 프로토콜은 시간지연이 서로 다른 다매체정보의 전송을 효과적으로 지원할 수 있다. 데이터 분석과 모의실험을 실행하여, 여러 시스템 매개변수에 의존하는 네트워크 출력과 평균지연을 조사했다. 그 결과, OCDMA기술에 근거한 POF를 네트워크를 사용하는 다우선 예약 프로토콜이 효율적이라는 것을 알았다.
Zhang Zu-Bing,Yin Ning-Na,Long Ji-Ming,Zhang Yong-Ke,Liu Nai-Yong,Zhu Jiaying 한국응용곤충학회 2021 Journal of Asia-Pacific Entomology Vol.24 No.1
Noorda blitealis (Lepidoptera: Pyraloidea: Crambidae) is a major defoliating pest of Moringa trees. Focusing on its mating and reproduction, here we sequenced and analyzed the transcriptome of its pheromone glands (PGs) with a combination of Illumina sequencing, bioinformatics and phylogenetics approaches, coupled with a genomebased analysis. Transcriptome sequencing led to the yields of approximately 162 million clean reads, which were assembled into 60,578 unigenes and 121,692 transcripts, respectively. From the transcriptome, totally 117 genes encoding eight pheromone biosynthesis enzymes and one pheromone degradation enzyme were identified, 90 of which had complete open reading frames. A comparative analysis between PGs and bodies (removing PGs) revealed a large number of differentially expressed genes, including 79 pheromone biosynthesis and degradation related genes. Of the identified genes, NbliDES12 belonging to the △11 desaturase group was likely to a strong candidate for the desaturation of sex pheromones in N. blitealis, as implied by phylogenetic analyses and expression profiles. Finally and most notably, through genome and transcriptome analyses we discovered, for the first time, a novel aldehyde oxidase 6 (AOX6) group of the superfamily Pyraloidea that have been slightly expanded by gene duplications. Moreover, each orthologous AOX group shared highly conserved gene structure. Together, this current study has characterized the genes associated with sex pheromone biosynthesis and degradation from the PG transcriptome of N. blitealis, and more importantly, identifies a novel AOX group of the Pyraloidea.