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Robust Multi-Objective H∞ Reliable Control for Delta Operator Switched Uncertain Linear Systems
Hao Hu,Bin Jiang,Hao Yang,Shumsky Alexey 제어·로봇·시스템학회 2015 International Journal of Control, Automation, and Vol.13 No.3
This paper deals with the robust guaranteed-cost H∞ reliable control problem for delta operator switched uncertain linear systems with actuator faults. The upper bound of the guaranteed-cost function is determined and the closed-loop system can be guaranteed some H∞ performance by using arbitrary and state switching control approaches. Finally, a simulation example is provided to illustrate the efficiency of the proposed methods.
Constituents of the Root of Anemone tomentosa
Hao-Bin Hu,Xu-Dong Zheng,Yu-Feng Jian,Jian-Xin Liu,Ji-Hua Zhu 대한약학회 2011 Archives of Pharmacal Research Vol.34 No.7
A new diterpene glycoside, tomentoside I (1), along with eleven known compounds, including the four coumarins, 4,5-dimethoxyl-7-methylcoumarin (2), 4,7-dimethoxyl-5-methylcoumarin (3), isofraxidin (4) and fraxidin (5) as well as the seven triterpenoids, oleanolic acid (6), oleanolic acid 3-O-α-L-arabinopyranoside (7), oleanolic acid 3-O-β-D-galactopyranosyl-(1→3)-β-Dglucopyranoside (8), hederagenin 3-O-α-L-arabinopyranoside (9), betulinic acid (10), 18-hydroxyursolic acid (11) and 2α,3β,23-trihydroxyurs-12-en-28-oic acid (12) were isolated from the ethanolic extract of the root of Anemone tomentosa and their chemical structures were elucidated by spectroscopic methods. The antimicrobial activities of compounds 1-12 were measured using the agar disc-diffusion method. Also, their antioxidant activities against 1,1-diphenyl-2-picrylhydrazyl (DPPH) were evaluated.
Triterpenoid Saponins from Elsholtzia bodinieri
Hao-bin Hu*,Xu-dong Zheng,Huai-sheng Hu,Yu-feng Jian 대한화학회 2007 Bulletin of the Korean Chemical Society Vol.28 No.9
A new oleanane-type triterpenoid estersaponin, bodinierin C (1), along with two known saponins, mazusaponin I (2) and ciwujianoside C (3), were isolated from the water-soluble part of the root barks of Elsholtzia bodinieri. The structure of bodinierin C was characterized by spectroscopic means and chemical hydrolysis as 3b -O-caffeoyl-23-hydroxylechinocystic acid 28-O-a -L-rhamnopyranosyl-(1 4)-b -D-glucopyranosyl-(1?6)-b -D-glucopyranosyl ester. The known compounds were identified by comparing their spectral data with those of authentic samples or data reported in the literature. All compounds were firstly isolated from Elsholtzia bodinieri family.
Triterpenoid Saponins from Elsholtzia bodinieri
Hu, Hao-Bin,Zheng, Xu-Dong,Hu, Huai-Sheng,Jian, Yu-Feng Korean Chemical Society 2007 Bulletin of the Korean Chemical Society Vol.28 No.9
A new oleanane-type triterpenoid estersaponin, bodinierin C (1), along with two known saponins, mazusaponin I (2) and ciwujianoside C (3), were isolated from the water-soluble part of the root barks of Elsholtzia bodinieri. The structure of bodinierin C was characterized by spectroscopic means and chemical hydrolysis as 3β -Ocaffeoyl- 23-hydroxylechinocystic acid 28-O-α -L-rhamnopyranosyl-(1→4)-β-D-glucopyranosyl-(1→6)-β- D-glucopyranosyl ester. The known compounds were identified by comparing their spectral data with those of authentic samples or data reported in the literature. All compounds were firstly isolated from Elsholtzia bodinieri family.
Improved Contrast for Threshold Random-grid-based Visual Cryptography
( Hao Hu ),( Gang Shen ),( Zhengxin Fu ),( Bin Yu ) 한국인터넷정보학회 2018 KSII Transactions on Internet and Information Syst Vol.12 No.7
Pixel expansion and contrast are two major performance parameters for visual cryptography scheme (VCS), which is a type of secret image sharing. Random Grid (RG) is an alternative approach to solve the pixel expansion problem. Chen and Tsao proposed the first (k, n) RG-based VCS, and then Guo et al., Wu et al., Shyu, and Yan et al. significantly improved the contrast in recent years. However, the investigations on improving the contrast of threshold RG-based VCS are not sufficient. In this paper, we develop a contrast-improved algorithm for (k, n) RG-based VCS. Theoretical analysis and experimental results demonstrate that the proposed algorithm outperformers the previous threshold algorithms with better visual quality and a higher accuracy of contrast.
Bin Li,Ning Sun,Hao Wang,Dandan Hu,Zhihui Zeng 전력전자학회 2023 JOURNAL OF POWER ELECTRONICS Vol.23 No.9
This paper discusses the power coupling problem of the traditional virtual synchronous generator (VSG) control strategy in medium and low-voltage microgrids, analyzes the cause of power coupling, and discusses the necessity for decoupling. In addition, a power decoupling control strategy based on an adaptive diagonal matrix compensation matrix is proposed. By compensating for the coupling component, the output power of the VSG is completely decoupled. To cope with the operating characteristics of frequent load switching on the grid side of a microgrid, the proposed strategy tracks variations in the static operating point of the VSG and automatically adjusts the compensation component. Simultaneously, the stability of the VSG is analyzed, using the transient instability criterion of the power system, to ensure decoupling. Finally, the effectiveness of the proposed control strategy is verified by simulation and experimental results.