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Calculation and analysis of switching losses in IGBT devices based on switching transient processes
Hao, Bin,Peng, Cheng,Tang, Xinling,Zhao, Zhibin The Korean Institute of Power Electronics 2022 JOURNAL OF POWER ELECTRONICS Vol.22 No.10
Accurately revealing the generation mechanism and the mathematical relationship with system parameters of the power loss in the switching transients of high-voltage large power IGBT devices is very important for the device selection and circuit design of converter equipment. To reveal the mechanism of generating switching losses, this paper analyzes the switching transient processes of the IGBT devices in the basic commutation circuit in detail. Then this paper proposes an accurate calculation method based on a finite state machine (FSM) for the switching losses of IGBT devices, and verifies the correctness of this method. To further reveal the mathematical relationships among switching losses, device parameters, and loop parameters, approximate analytical formulas for the switching loss of different switching transient processes are mathematically derived, which can provide a theoretical basis for reducing the switching losses in converters.
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.
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.
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.
Zhang, Bin,Hao, Guang-Yu,Gao, Fang,Zhang, Jian-Zu,Zhou, Cheng-Jiang,Zhou, Li-She,Wang, Ying,Jia, Yan-Bin Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.12
Several lines of evidence support the notion that MUC1 is often aberrantly expressed in gastric cancer, and it is a ligand for Helicobacter pylori. Genetic variation in MUC1 gene may confer susceptibility to H. pylori infection and gastric cancer. We assessed the association of common polymorphisms in MUC1 gene with H. pylori infection and non-cardia gastric cancer using an LD-based tag SNP approach in north-western Chinese Han population. A total of four SNPs were successfully genotyped among 288 patients with non-cardia gastric cancer and 281 age- and sex-matched controls. None of the tested SNPs was associated with H. pylori infection. SNP rs9426886 was associated with a decreased risk of non-cardia gastric cancer, but lost significance after adjustment for multiple testing. Overall, our data indicated that common genetic variations in MUC1 gene might not make a major contribution to the risk of H. pylori infection and non-cardia gastric cancer in our studied population.