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Adaptive Controller Design for a Synchronous Generator with Unknown Perturbation in Mechanical Power
Xiaohong Jiao,Yuanzhang Sun,Tielong Shen 대한전기학회 2005 International Journal of Control, Automation, and Vol.3 No.2
Transient stabilization with voltage regulation is investigated for a synchronous generator when the mechanical power is perturbed to any unknown value within its physical bounds so that the operating point of the system shifts to an unknown point. An adaptive excitation controller is designed based on the backstepping method with tuning functions. It will be shown that the adaptive control law proposed can achieve the convergence of the system states to the new equilibrium point in correspondence with the real value of the unknown mechanical power and the regulation of the terminal voltage to the required value. Simulation results are given to demonstrate the effectiveness of the proposed controller for the transient stabilization and voltage regulation.
Xiaohong Wang,Zhen Wang,Yingjie Fan,Jianwei Xia,Hao Shen 제어·로봇·시스템학회 2019 International Journal of Control, Automation, and Vol.17 No.4
This paper addresses the global asymptotic stabilization of delayed fractional complex-valued neural networks(FCVNNs) subject to bounded parameter uncertainty. The problem is proposed for two reasons: 1) The availablemethods for uncertain dynamical systems may be too conservative; 2) The existing algebraic conditions willlead to huge computational burden for large-scale FCVNNs. To surmount these difficulties, the delayed FCVNNswith interval parameters are transformed into a tractable form at first. Then, a simple and practical controller–linearstate feedback controller is designed to achieve the global asymptotic stabilization. By constructing different Lyapunovfunctions and utilizing the fractional-order comparison principle and interval matrix method, two sufficientglobal asymptotic stabilization criteria expressed in LMI forms, are established. The obtained results in this paperimprove and extend some previous published results on FCVNNs. Finally, two numerical examples are provided toillustrate the correctness of the theoretical results.
Adaptive Controller Design for a Synchronous Generator with Unknown Perturbation in Mechanical Power
Jiao Xiaohong,Sun Yuanzhang,Shen Tielong Institute of Control 2005 International Journal of Control, Automation, and Vol.3 No.S
Transient stabilization with voltage regulation is investigated for a synchronous generator when the mechanical power is perturbed to any unknown value within its physical bounds so that the operating point of the system shifts to an unknown point. An adaptive excitation controller is designed based on the backstepping method with tuning functions. It will be shown that the adaptive control law proposed can achieve the convergence of the system states to the new equilibrium point in correspondence with the real value of the unknown mechanical power and the regulation of the terminal voltage to the required value. Simulation results are given to demonstrate the effectiveness of the proposed controller for the transient stabilization and voltage regulation.
Image Denoising Using Low-Rank and Sparse Constraints
Qiang Guo,Yunfeng Zhang,Xiaohong Shen (사)한국CDE학회 2013 한국CAD/CAM학회 국제학술발표 논문집 Vol.2010 No.8
In this short paper, the SAIST method recently proposed for image denoising is improved by exploiting the fixed rank and sparsity constraints. Experimental results show that the improved SAIST obtains better performance than the original SAIST and BM3D.
DNA ORIGAMI SITE-SPECIFIC ARRANGEMENT OF GOLD NANOPARTICLES
AMOAKO GEORGE,RIAN YE,LIZHOU ZHUANG,XIAOHONG YANG,ZHIYONG SHEN,MING ZHOU 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2013 NANO Vol.8 No.6
Controlling matter at the nanoscale holds a lot of promise in nanotechnology. The DNA origami is promising if used as a template to design and arrange matter at the nanoscale. We have used the DNA origami approach to engineer staple strands at selected sites for attachment of gold nanoparticles. The covalent attachment of thiol-modified DNA oligomers was used to functionalize gold nanoparticles. These oligomers then hybridize with complementary strands extended on selected staple strands on the DNA origami surface with nanometer precision. Gold nanoparticles of 5 nm diameter were arranged across a DNA origami tube to form a C-shape which has potential use in electronics and plasmonics. Agarose gel electrophoresis, AFM, UV-Vis spectroscopy and TEM were used to characterize the structure.
Yang Zhen,Xie Jiqin,Yang Yu,Sun Xiaohong,Jing Jie,Shen Yongmei,Yue Bisong,Zhang Xiuyue 한국곤충학회 2021 Entomological Research Vol.51 No.12
Thymosin is a physiologically active polypeptide hormone which has many functions involved in promoting wound healing, promoting hair growth, and accelerating tissue and organ regeneration. American cockroach (Periplaneta americana) has three subtypes thymosin (THY1, THY2, THY3) which are different splices from the same thymosin gene. Real-time PCR was used to detect and analyze the expression differences of THY1 and THY2 in different stages, sexes, tissues and after stimulation by bacteria. Thymosins were expressed in adult, eclosion, and ootheca, and their expression levels were significantly up-regulated during the eclosion period, showing the thymosin might be involved in the eclosion process. The expression levels of thymosins in females were higher than males, and the differences in eclosion stages were more significant (P < 0.01), indicating that they were closely related to development and female reproduction. The expressions of THY1 and THY2 in hemolymph were significantly higher (P < 0.01) than that in other tissues. The up-regulated expression of thymosin in two immune-related tissues (Hemolymph and adipose) after Escherichia coli stimulation further confirmed its involvement in the immune response. Our research would provide a basis for screening of novel pesticides target genes.
Coloring mechanism of celadon glazes from Yaozhou kiln
Zhen Sang,Fen Wang,Xiaojuan Yuan,Shurui Shen,Jing Wang,Xiaohong Wei 한양대학교 청정에너지연구소 2022 Journal of Ceramic Processing Research Vol.23 No.6
The Five Dynasty sky-green, Song dynasty olive-green and Jin dynasty moon-white glazes are three typical glazes of theYaozhou celadon. In this work, the coloring mechanism of the three celadon glazes were compared and analyzed by usingcolorimeter, EDXRF, XRD, XPS and Raman spectrometer. The results indicate that the content of Fe2O3 is proportional tothe depth of the glaze colors. The Raman Ip value indicates that the firing temperature of the Song dynasty olive-green glazewas the highest, followed by the Five Dynasty, and then the Jin dynasty. The lower firing temperature and dense bubbles areimportant causes of the high opacification of the Jin moon-white glaze. The ratio of Fe2+ to Fe3+ in the glaze is directlyproportional to the b* value, which is the main reason for why the Yao celadon glaze colors are yellow-green in Song, butbluish in the Five Dynasty and Jin dynasty.
Adaptive OFDMA with Partial CSI for Downlink Underwater Acoustic Communications
Yuzhi Zhang,Yi Huang,Lei Wan,Shengli Zhou,Xiaohong Shen,Haiyan Wang 한국통신학회 2016 Journal of communications and networks Vol.18 No.3
Multiuser communication has been an important researcharea of underwater acoustic communications and networking. This paper studies the use of adaptive orthogonal frequencydivisionmultiple access (OFDMA) in a downlink scenario, wherea central node sends data to multiple distributed nodes simultaneously. In practical implementations, the instantaneous channelstate information (CSI) cannot be perfectly known by the centralnode in time-varying underwater acoustic (UWA) channels, due tothe long propagation delays resulting from the low sound speed. In this paper, we explore the CSI feedback for resource allocation. An adaptive power-bit loading algorithm is presented, which assignssubcarriers to different users and allocates power and bits toeach subcarrier, aiming to minimize the bit error rate (BER) underpower and throughput constraints. Simulation results show considerableperformance gains due to adaptive subcarrier allocationand further improvement through power and bit loading, as comparedto the non-adaptive interleave subcarrier allocation scheme. In a lake experiment, channel feedback reduction is implementedthrough subcarrier clustering and uniform quantization. Althoughthe performance gains are not as large as expected, experiment resultsconfirm that adaptive subcarrier allocation schemes based ondelayed channel feedback or long term statistics outperform theinterleave subcarrier allocation scheme.
Liuxin Xiang,Yuxian Xia,Ying-Fan Cai,Jijun Liu,Xiaohong He,Quan Sun,Xiaoyan Wang,Yuyin Fu,Yonghong Fan,Daiwen Dong,Guanfan Zhou,Jinjuan Shen,Yihua Liu 한국식물학회 2013 Journal of Plant Biology Vol.56 No.3
The first tuber mustard calmodulin-like (CML) gene BjAAR1 (Brassica juncea var. tumida Tsen et Lee Abiotic stress and Abscisic acid (ABA) Responsive gene 1) was cloned and characterized. The protein encoded by BjAAR1 contains four predicted Ca2+ binding sites (EF-hand motif) and its recombinant protein can bind Ca2+ in vitro. qRT-PCR showed that the expression level of BjAAR1 was rather high in non-swollen stem of tuber mustard and largely reduced in swollen stem. Expression of BjAAR1 enhanced ABA- and stress-induced gene expression in Arabidopsis (Arabidopsis thaliana). Transgenic plants also exhibited hypersensitivity to NaCl, mannitol, and ABA during the seed germination and post-germination stages. ABA biosynthesis inhibitor, norflurazon (NF), rescued hypersensitivity phenotype of transgenic plants to NaCl and mannitol, indicating that BjAAR1 functions in multiple abiotic stresses response through ABA-dependent process.