http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Xuefeng Yang (검색결과 34 건)
- 무료
- 기관 내 무료
- 유료
-
Yang Yang,Yuwei Zhang,Zijin Wang,Xuefeng Si,Jinran Wu 제어·로봇·시스템학회 2023 International Journal of Control, Automation, and Vol.21 No.2
Fault-tolerant control (FTC) of a non-affine system with uncertainties is one of critical issues in nonlinear control. In this paper, in the presence of unknown actuator failures, an event-trigger-based FTC scheme is proposed for such a nonlinear system with predefined performance. For actuator failures, a compensation mechanism is designed to alleviate their impacts. By utilizing a predefined performance function, higher tracking accuracy can be obtained. Meanwhile, an event-triggered mechanism with a time-varying threshold, depending on tracking error, reduces the number of communications for a controller-to-actuator channel. An adaptive event-triggered function is then proposed with the compensation mechanism to improve the self-adjusting ability of the triggered function. Also, extended state observers and tracking differentiators are utilized to reconstruct unknown dynamics of the system and to simplify high-order derivation of virtual control laws, respectively. The stability of the closed-loop system is analyzed by input-to-state practically stability. Finally, two simulation results are supplied to verify the effectiveness of the proposed control method.
-
-
Xuefeng Zhang,Yujie Zhang,Qin Yang,Yingchun Yang,Xuping Sun 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.127 No.-
Sulfate radical-based advanced oxidation processes (AOPs) are highly reliable for the elimination of recalcitrantcontaminants by increasing degradability and reducing toxicity. Here, MnFe2O4 nanowires(MnFe2O4 NWs), composed of abundant MnFe2O4 nanoparticles immobilized on one-dimensional carbonnanowires derived from annealed MnFe-Nitrilotriacetic acid (MnFe-NTA) precursor was successfully synthesized. The MnFe2O4 NWs, which could provide more active sites, were then utilized to activate peroxymonosulfate(PMS) for oxidizing the target pollutant Moxifloxacin (MOX) in an aqueous solution. TheMnFe2O4 NWs/PMS system acquired 91.9% removal of MOX and achieved 55.1% chemical oxygen demand(COD) degradation efficiency in 30 min. The results exhibited that the increased catalyst doses and PMSconcentration lead to ascending MOX removal rate, which decreased with the participation of co-existingions. Besides, there is a close relationship between original pH and MOX degradation efficiency. It wasfound that SO4 –, OH, 1O2, and O2 – were involved in the MOX degradation by quenching experimentsand electron paramagnetic resonance (EPR) detection. More importantly, the stable magnetism ofMnFe2O4 NWs contributed to its convenient recycling. Finally, a reliable mechanism for activating PMSwas proposed based on the aforementioned results and previous researches, which could exhibit a novelhorizon in effluent treatment.
-
Xuefeng Li,Yong Zhang,Mingyang Du,Jingzong Yang 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.5
The emergence of free-floating bike sharing (FFBS) has made essential changes in urban bicycle travel. In order to explore the differences of travel behavior among private bicycle (PB), public bicycle sharing (PBS) and FFBS, a survey was conducted in Kunming, China in 2018. Firstly, the differences of travel characteristics among these three modes were analyzed based on 522 valid questionnaires. Then, a multinomial logistic model was applied to explore the influential factors among them. The results show that: 1) PB and FFBS are more attractive for long-distance travel enthusiasts compared with PBS, PB is rarely used for transfer in suburbs while FFBS is the most desirable in connecting other travel modes. The theft problem and high maintenance costs are main obstacles for PB. 2) The elderly, high-income and non-student groups in inflexible travel activities show a preference for PBS, while the young, low-income and student groups in flexible travel demands have a tendency towards FFBS. 3) PB and PBS imped the use of FFBS to a certain extent, while PB seems to have less impact on PBS. 4) FFBS is desirable in temporary travel demand while PBS is more preferable in fixed demand. Interestingly, residents with registered permanent residence tend to use PBS while those without registered permanent residence prefer FFBS. Finally, several management strategies and policy recommendations were proposed for the government and FFBS enterprises to improve the management of bicycles.
-
Multiple damages detection in beam based approximate waveform capacity dimension
Yang, Zhibo,Chen, Xuefeng,Tian, Shaohua,He, Zhengjia Techno-Press 2012 Structural Engineering and Mechanics, An Int'l Jou Vol.41 No.5
A number of mode shape-based structure damage identification methods have been verified by numerical simulations or experiments for on-line structure health monitoring (SHM). However, many of them need a baseline mode shape generated by the healthy structure serving as a reference to identify damages. Otherwise these methods can hardly perform well when multiple cracks conditions occur. So it is important to solve the problems above. By aid of the fractal dimension method (FD), Qiao and Wang proposed a generalized fractal dimension (GFD) to detect the delamination damage. As a modification of GFD, Qiao and Cao proposed the approximate waveform capacity dimension (AWCD) technique to simplify the calculation of fractal and overcome the false peak appearing in the high mode shapes. Based on their valued work, this paper combined and applied the AWCD method and curvature mode shape data to detect multiple damages in beam. In the end, the identification properties of the AWCD for multiple damages have been verified by groups of Monte Carlo simulations and experiments.
-
Epigenetic silencing of UBXN8 contributes to leukemogenesis in t(8;21) acute myeloid leukemia
Yang Erna,Guan Wei,Gong Desheng,Li Jieying,Han Caixia,Zhang Juan,Wang Hong,Kang Synat,Gao Xuefeng,Li Yonghui,Yu Li 생화학분자생물학회 2021 Experimental and molecular medicine Vol.53 No.-
The formation of the RUNX1-RUNX1T1 fusion protein, resulting from the t(8;21) translocation, is considered to be one of the initiating events of t(8;21) acute myeloid leukemia (AML). However, the mechanisms of the oncogenic mechanism of RUNX1- RUNX1T1 remain unclear. In this study, we found that RUNX1-RUNX1T1 triggers the heterochromatic silencing of UBXN8 by recognizing the RUNX1-binding sites and recruiting chromatin-remodeling enzymes to the UBXN8 promoter region. Decitabine, a specific inhibitor of DNA methylation, upregulated the expression of UBXN8 in RUNX1-RUNX1T1+ AML cell lines. Overexpression of UBXN8 inhibited the proliferation and colony-forming ability of and promoted cell cycle arrest in t(8;21) AML cell lines. Enhancing UBXN8 levels can significantly inhibit tumor proliferation and promote the differentiation of RUNX1-RUNX1T1+ cells in vivo. In conclusion, our results indicated that epigenetic silencing of UBXN8 via methylation of its promoter region mediated by the RUNX1- RUNX1T1 fusion protein contributes to the leukemogenesis of t(8;21) AML and that UBXN8 targeting may be a potential therapeutic strategy for t(8;21) AML. The formation of the RUNX1-RUNX1T1 fusion protein, resulting from the t(8;21) translocation, is considered to be one of the initiating events of t(8;21) acute myeloid leukemia (AML). However, the mechanisms of the oncogenic mechanism of RUNX1-RUNX1T1 remain unclear. In this study, we found that RUNX1-RUNX1T1 triggers the heterochromatic silencing of UBXN8 by recognizing the RUNX1-binding sites and recruiting chromatin-remodeling enzymes to the UBXN8 promoter region. Decitabine, a specific inhibitor of DNA methylation, upregulated the expression of UBXN8 in RUNX1-RUNX1T1 + AML cell lines. Overexpression of UBXN8 inhibited the proliferation and colony-forming ability of and promoted cell cycle arrest in t(8;21) AML cell lines. Enhancing UBXN8 levels can significantly inhibit tumor proliferation and promote the differentiation of RUNX1-RUNX1T1 + cells in vivo. In conclusion, our results indicated that epigenetic silencing of UBXN8 via methylation of its promoter region mediated by the RUNX1-RUNX1T1 fusion protein contributes to the leukemogenesis of t(8;21) AML and that UBXN8 targeting may be a potential therapeutic strategy for t(8;21) AML.
-
An Efficient Broadcast Authentication Scheme with Batch Verification for ADS-B Messages
( Haomiao Yang ),( Hyunsung Kim ),( Hongwei Li ),( Eunjun Yoon ),( Xiaofen Wang ),( Xuefeng Ding ) 한국인터넷정보학회 2013 KSII Transactions on Internet and Information Syst Vol.7 No.10
As a cornerstone of the next generation air traffic management (ATM), automatic dependent surveillance-broadcast (ADS-B) system can provide continual broadcast of aircraft position, identity, velocity and other messages over unencrypted data links to generate a common situational awareness picture for ATM. However, since ADS-B messages are unauthenticated, it is easy to insert fake aircrafts into the system via spoofing or insertion of false messages. Unfortunately, the authentication for ADS-B messages has not yet been well studied. In this paper, we propose an efficient broadcast authentication scheme with batch verification for ADS-B messages which employs an identity-based signature (IBS). Security analysis indicates that our scheme can achieve integrity and authenticity of ADS-B messages, batch verification, and resilience to key leakage. Performance evaluation demonstrates that our scheme is computationally efficient for the typical avionics devices with limited resources, and it has low communication overhead well suitable for low-bandwidth ADS-B data link.
-
Multiple damages detection in beam based approximate waveform capacity dimension
Zhibo Yang,Xuefeng Chen,Shaohua Tian,Zhengjia He 국제구조공학회 2012 Structural Engineering and Mechanics, An Int'l Jou Vol.41 No.5
A number of mode shape-based structure damage identification methods have been verified by numerical simulations or experiments for on-line structure health monitoring (SHM). However, many of them need a baseline mode shape generated by the healthy structure serving as a reference to identify damages. Otherwise these methods can hardly perform well when multiple cracks conditions occur. So it is important to solve the problems above. By aid of the fractal dimension method (FD), Qiao and Wang proposed a generalized fractal dimension (GFD) to detect the delamination damage. As a modification of GFD, Qiao and Cao proposed the approximate waveform capacity dimension (AWCD) technique to simplify the calculation of fractal and overcome the false peak appearing in the high mode shapes. Based on their valued work, this paper combined and applied the AWCD method and curvature mode shape data to detect multiple damages in beam. In the end, the identification properties of the AWCD for multiple damages have been verified by groups of Monte Carlo simulations and experiments.
-
Li Yang,Xue Hongtao,Zhou Xin,Tang Fuling,Li Xiuyan,Ren Junqiang,Lu Xuefeng 한국물리학회 2021 Current Applied Physics Vol.28 No.-
Grain boundaries (GBs) relaxation is a promising and effective strategy to improving GB stability or stabilizing nanocrystalline metals. However, previous studies mainly focused on nanocrystalline pure metals and GB behaviors therein, without considering the role of foreign atoms such as impurity or alloying atoms in GB relaxation. In this work, the shear-strain induced structural relaxation of pure Cu Σ3 [110](112) symmetric tilt GBs (STGBs), and the effects of foreign elements (Fe and Ni) and temperature on the GB relaxation were investigated in detail by molecular dynamics method. The results show that shear strain can trigger the structural relaxation of pure, Fe- and Ni-containing Cu GBs by the emission of Shockley partial dislocations from Cu GBs. Both Fe and Ni have impediment effects on the shear-strain induced GB relaxation, though the content of Fe or Ni atom (0.00165 at.%) is quite low in the GB model. The temperature cannot trigger GB relaxation independently within the considered temperature range, but play a positive role in the shear-strain induced structural relaxations of pure, Fe- and Ni-containing Cu Σ3 [110](112) STGBs. Our work might gain new insights into the mechanically induced GB relaxation in nanocrystalline copper and could be beneficial for improving the stability of Cu GBs.
-
KISS연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
