HpaXm from Xanthomonas citri sub네. Malvacearum is a Novel Harpin with Two Heptads for Hypersensitive Response

Wei Guo Miao,Cong Feng Song,Yu Wang,Jin Sheng Wang 한국미생물 · 생명공학회 2010 Journal of microbiology and biotechnology Vol.20 No.1

A Magnetic Energy Recovery Switch Based Terminal Voltage Regulator for the Three-Phase Self-Excited Induction Generators in Renewable Energy Systems

Wei, Yewen,Kang, Longyun,Huang, Zhizhen,Li, Zhen,Cheng, Miao miao The Korean Institute of Power Electronics 2015 JOURNAL OF POWER ELECTRONICS Vol.15 No.5

Distributed generation systems (DGSs) have been getting more and more attention in terms of renewable energy use and new generation technologies in the past decades. The self-excited induction generator (SEIG) occupies an important role in the area of energy conversion due to its low cost, robustness and simple control. Unlike synchronous generators, the SEIG has to absorb capacitive reactive power from the outer device aiming to stabilize the terminal voltage at load changes. This paper presents a novel static VAR compensator (SVC) called a magnetic energy recovery switch (MERS) to serve as a voltage controller in SEIG powered DGSs. In addition, many small scale SEIGs, instead of a single large one, are applied and devoted to promote the generation efficiency. To begin with, an expandable mathematic model based on a d-q equivalent circuit is created for parallel SEIGs. The control method of the MERS is further improved with the objective of broadening its operating range and restraining current harmonics by parameter optimization. A hybrid control strategy is developed by taking both of the stand-alone and grid-connected modes into consideration. Then simulation and experiments are carried out in the case of single and double SEIG(s) generation. Finally, the measurement results verify that the proposed DGS with SVC-MERS achieves a better stability and higher feasibility. The major advantages of the mentioned variable reactive power supplier, when compared to the STATCOM, include the adoption of a small DC capacitor, line frequency switching, simple control and less loss.

Homoisoflavanones from Polygonatum odoratum Rhizomes Inhibit Advanced Glycation End Product Formation

Wei Dong,Hai Bo Shi,Heng Ma,Yan Bo Miao,Tong Jun Liu,Wei Wang 대한약학회 2010 Archives of Pharmacal Research Vol.33 No.5

Protein glycation inhibitors from Polygonatum odoratum rhizomes were investigated using a bioassay-guided procedure to characterize active compounds for preventing and treating diabetic complications. The EtOH extract and soluble fractions were evaluated using an in vivo model of renal advanced glycation end-product (AGE) accumulation in streptozotocin-induced diabetic rats and an in vitro bovine serum albumin-glucose assay. Three homoisoflavanones 3-(4’-hydroxybenzyl)-5,7-dihydroxy-6-methyl-8-methoxychroman-4-one (1), 3-(4’-hydroxybenzyl)-5,7-dihydroxy-6,8-dimethylchroman-4-one (2), and 3-(4’-methoxybenzyl)-5,7-dihydroxy-6-methyl-8-methoxychroman-4-one (3), isolated from the active CHCl3-soluble fraction of the EtOH extract, were subjected to in vitro bioassays to evaluate their inhibitory activities against AGE formation. All the isolates inhibited AGE formation more effectively than the positive control, aminoguanidine. These results indicate that pending further study these compounds could be used as novel natural product drug for mitigating diabetic complications.

Hydraulic node model and parameter identification of a dull recoil brake

Wei Miao,Linfang Qian,Longmiao Chen 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.11

This paper proposes a hydraulic node model for recoil brake. This model considers the compressibility and phase transition of recoil liquid by introducing a density-based piecewise equation of liquid state. For applying the hydraulic node model to a device named dull recoil brake, a least-squares parameter identification method based on the ant lion optimizer is used to determine the resistance coefficients. We measure the pressure responses of the dull recoil brake in firing tests on a 155 mm howitzer at two different working conditions and identify the resistance coefficients according to the pressure responses. Comparison between the simulations and the measurements verifies the hydraulic node model and the parameter identification result. This model shows remarkable performance in predicting the occurrence and magnitude of the hydraulic impacts. According to simulation results, we investigate the mechanism of the delayed retarding force and the secondary liquid impact. We find that the axial ending point of the crescent slots determines the moments when the recoil brake force rises and when the secondary liquid impact occurs.

Modeling and Analysis of Magnetized Nanomaterial Williamson Towards a Variable Thicked Surface Subject to Joule Heating and Activation Energy

Wei-Miao Qian,Fazal Haq,M. Ijaz Khan,Sohail A. Khan,Shahid Farooq 한국자기학회 2021 Journal of Magnetics Vol.26 No.2

Effect of Turbulent Fluctuation on Settling Behavior of Dredged Slurry in Sheared Condition

Miao-miao Song,Gui-zhong Xu,Jie Yin,Wei-juan Geng,Zhi-yan Zhou,Cheng-chun Qiu 대한토목학회 2021 KSCE JOURNAL OF CIVIL ENGINEERING Vol.25 No.4

For the land shortage problem upon the city development in coastal areas, it is of great importance to improve the overall understanding of the settlement behavior of dredged slurry and determine the required site water storage capacity as well as the mechanical properties of the newly formed dredged slurry. This paper presents an experimental investigation on the effect of turbulent fluctuation on the settling behavior of dredged slurry in sheared condition via a self-developed testing apparatus namely double cylinder settling column. Test results showed that the settling velocity of the soil-water interface initially increased then decreased with the increasing rotation speed of the inner column. The interface would disappear and a stable suspended layer was observed when the rotation speed was greater than 20 rad/min, where water contents and grain composition were not changed over the depth. The particle content was closer to that of the original sample as the rotation speed kept increasing in the suspended layer. It was found that the stabilized flocs were gradually broken down by the turbulence effect existing in the sheared slurry. Moreover, the stabilized flocs were losing the stability gradually as the flowing velocity increased till 10 rad/min and the floc structure was broken down completely once the flowing velocity was greater than 20 rad/min.

A Magnetic Energy Recovery Switch Based Terminal Voltage Regulator for the Three-Phase Self-Excited Induction Generators in Renewable Energy Systems

Yewen Wei,Longyun Kang,Zhizhen Huang,Zhen Li,Miao miao Cheng 전력전자학회 2015 JOURNAL OF POWER ELECTRONICS Vol.15 No.5

Distributed generation systems (DGSs) have been getting more and more attention in terms of renewable energy use and new generation technologies in the past decades. The self-excited induction generator (SEIG) occupies an important role in the area of energy conversion due to its low cost, robustness and simple control. Unlike synchronous generators, the SEIG has to absorb capacitive reactive power from the outer device aiming to stabilize the terminal voltage at load changes. This paper presents a novel static VAR compensator (SVC) called a magnetic energy recovery switch (MERS) to serve as a voltage controller in SEIG powered DGSs. In addition, many small scale SEIGs, instead of a single large one, are applied and devoted to promote the generation efficiency. To begin with, an expandable mathematic model based on a d-q equivalent circuit is created for parallel SEIGs. The control method of the MERS is further improved with the objective of broadening its operating range and restraining current harmonics by parameter optimization. A hybrid control strategy is developed by taking both of the stand-alone and grid-connected modes into consideration. Then simulation and experiments are carried out in the case of single and double SEIG(s) generation. Finally, the measurement results verify that the proposed DGS with SVC-MERS achieves a better stability and higher feasibility. The major advantages of the mentioned variable reactive power supplier, when compared to the STATCOM, include the adoption of a small DC capacitor, line frequency switching, simple control and less loss.

Thermo-mechanical Coupling Modeling of Active Phased Array Antennas

Xinyuan Wei,Enming Miao,Yangyang Chen,Wei Wang 한국정밀공학회 2019 International Journal of Precision Engineering and Vol.20 No.11

The large thermal deformation of the panel in active phased array antennas (APAAs) caused by the thermal power consumption of the internal devices and the change in the ambient temperature in actual operating conditions will result in a considerable decline in the electromagnetic (EM) performance of radar. Experimental research indicates that the thermal deformation of the panel is affected not only by temperature but also by the constraints caused by the installation. Thus, this paper proposes a thermo-mechanical coupling modeling method for an APAA considering the panel temperature and constraints. The coupling model can accurately predict the panel thermal deformation, thereby providing a basis for the compensation of the EM performance of radar. The thermal deformation of the panel is decomposed into a thermal expansion and an offset. Models of the thermal expansion with respect to temperature and the offset with respect to the constraint force are established. The final thermo-mechanical coupling model is obtained by coupling the two models. Experiments verify that the prediction accuracy of the coupling model is 86.3%, which is 21.0% higher than that of a finite element software simulation. The content of this research has practical engineering importance for improving the overall performance of APAAs

주제별 논단 : 기타 ; 중국 상업은행 자본관리감독과 영향력에 대한 검토

위경묘 ( Jing Miao Wei ) 한국금융법학회 2012 金融法硏究 Vol.9 No.2

자본관리감독은 상업은행 건전성관리감독의 핵심이다. 개혁개방 이후 30여 년간 은행 자본관리감독은 제도 초창기(1995년 7월 이전) 자본 연성 제약(軟約束,1995년 7월부터2004년 2월까지)과 자본 경성 제약(硬約束)(2004년 3월부터 현재까지)의 3단계를 거쳤으며, 은행감독규제에서 자본도구의 지위와 역할에 대한 이해는 점차 심화 된 것이다 바젤협약III을 실행하기 위하여 중국은행업감독관리위원회(China Banking Regulatory Commission,이하 “CBRC”)는 2012년 6월<상업은행자본관리규정(시행)>(商業銀行資本管理判法(實行))을 발표하였으며, 새로운 자본관리규정은 2013년 1월1일부로 실시될 예정이다. 신 규정은 기존 자본감독규제상 규제위험 종류가 적고 위험에 대한 민감성이 부족하며 상업은행의 위험관리에 격려메커니즘이 부족한 등의 문제점을 해결하였고 자기자본비율 감독관리요구를 세분화하고 높였으며 자본의 범위를 엄격히 하고 자본규제위험의 범위와 자본규제의 범위를 확대하였다. 또한 신용위험가중치를 조정하고 은행위험관리규제의 인센티브를 수립하였으며 상업은행 분류기준과 분류방법을 개정하고 은행에 대한 차별화 관리감독을 강조하였고 은행의 정보공시를 엄격히 규제하였다. 신 규정은 은행시스템의 안전성을 높이고 은행의 손실흡수능력을 높였으며 실체경제의 순조로운 운행에 이롭게 하였다. 신 규정의 실행으로 인하여 은행 자산충족률이 보편적으로 낮아지고 모든 은행들이 자본보충의 압력을 받게 되였다 그러나 대출충당률(貸款拔備率)의 감독관리요구와 자본시장의 감당력은 은행의 자본보충을 어렵게 함으로써 자본공구의 창조가 급박하게 되었다. 자본제약의 강화는 향후은행의 업무구조에 영향을 미치게 되며 은행으로 하여금 자본소모가 많은 기존의 호방식 경영모델(extensive operation model)에 변화를 주도록 압력을 줄 것이며, 이는 은행의 장기적인 발전에 유리하게 작용할 것이다. Capital regulation is the core of the prudential supervision of commercial banks, More than thirty years since the reform and opening up of new China, the regulatory capital of the bank experienced a system start-up (from the reform and opening up to 1995 June), capital soft constraints (1995 July to 2004 February) and capital hard constraints (2004 March up to now) in three stages, our understanding of the status and role of capital instruments in the banking supervision is gradually depth. In order to implement the Base lII,2012June China Banking Regulatory Commission released a commercial bank capital management(Trial), the new capital management approach will be implemented on January 1,2013. The new approach to overcome it exists on the original capital regulation covers the types of risks, the risk of a lack of the original capital regulation covers the types of risks, the risk of a lack of sensitivity, risk management of commercial banks lack incentives defects. The new approach to refine and improve the capital adequacy ratio of regulatory requirements strict a definition of capital coverage of the border, to adjust the credit risk of the right weight, to establish a bank risk tubes control the incentives, to modify the commercial banks classification criteria and classification method, emphasizing the differentiated supervision of banks, and strictly regulate the disclosure of bank information. The new approach will enhance the security of the banking system, and enhance the ability of banks to absorb losses, which will help the real economy benign. However, the implementation of the new approach will give banks capital replenishment; loan provision rate regulatory requirements and the capacity of the capital market, will enable the bank`s capital supplement difficult, capital instruments innovation is imminent; the capital constraints further enhanced impact will be the next bank business structure, forcing the bank to change the extensive operation mode high capital consumption, which will have a favorable impact on the bank`s long-term development.

Chemosensitizing effect and mechanism of imperatorin on the anti-tumor activity of doxorubicin in tumor cells and transplantation tumor model

Xin-li Liang,Miao-miao Ji,Zheng-gen Liao,Guo-wei Zhao,Xi-lan Tang,Wei Dong 대한약리학회 2022 The Korean Journal of Physiology & Pharmacology Vol.26 No.3

Multidrug resistance of tumors has been a severe obstacle to the success of cancer chemotherapy. The study wants to investigate the reversal effects of imperatorin (IMP) on doxorubicin (DOX) resistance in K562/DOX leukemia cells, A2780/Taxol cells and in NOD/SCID mice, to explore the possible molecular mechanisms. K562/ DOX and A2780/Taxol cells were treated with various concentrations of DOX and Taol with or without different concentrations of IMP, respectively. K562/DOX xenograft model was used to assess anti-tumor effect of IMP combined with DOX. MTT assay, Rhodamine 123 efflux assay, RT-PCR, and Western blot analysis were determined in vivo and in vitro. Results showed that IMP significantly enhanced the cytotoxicity of DOX and Taxol toward corresponding resistance cells. In vivo results illustrated both the tumor volume and tumor weight were significantly decreased after 2-week treatment with IMP combined with DOX compared to the DOX alone group. Western blotting and RT-PCR analyses indicated that IMP downregulated the expression of P-gp in K562/DOX xenograft tumors in NOD/SCID mice. We also evaluated glycolysis and glutamine metabolism in K562/DOX cells by measuring glucose consumption and lactate production. The results revealed that IMP could significantly reduce the glucose consumption and lactate production of K562/DOX cells. Furthermore, IMP could also remarkably repress the glutamine consumption, α-KG and ATP production of K562/DOX cells. Thus, IMP may sensitize K562/DOX cells to DOX and enhance the antitumor effect of DOX in K562/DOX xenograft tumors in NOD/SCID mice. IMP may be an adjuvant therapy to mitigate the multidrug resistance in leukemia chemotherapy.