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Xin, Chao-Jun,Cai, Yuan-Wen,Ren, Yuan,Fan, Ya-Hong The Korean Institute of Electrical Engineers 2018 Journal of Electrical Engineering & Technology Vol.13 No.2
The aim of this paper is to design a centrifugal deformation error compensation method with guaranteed performance that allows angular velocity measurement of the magnetically suspended sensitive gyroscopes (MSSGs). The angular velocity measurement principle and the structure of the MSSG are described, and the analytical model of errors caused by MSSG rotor centrifugal deformation is established. Then, an on-line rotor centrifugal deformation error compensation method based on measurement of rotor spinning speed in real-time has been designed. The common issues caused by centrifugal deformation of spinning rotors can be effectively resolved by the proposed method. Comparative experimental results before and after compensation demonstrate the validity and superiority of the error compensation method.
Modeling and Analysis of Drift Error from Stator of A MSSG with Double Spherical Envelope Surfaces
Chao-Jun Xin,Yuan-Wen Cai,Yuan Ren,Ya-Hong Fan 대한전기학회 2016 Journal of Electrical Engineering & Technology Vol.11 No.5
For the newly developing magnetically suspended sensitive gyroscope (MSSG) with double spherical envelope surfaces, it is necessary to analyze the causes of drift error to improve sensing accuracy. This paper builds the models of disturbing torques generated by stator assembly and process errors based on the geometric construction and running regularity of the MSSG, and further reveals the generation mechanism of the drift error. Then the drift error from a single stator magnetic pole is calculated quantitatively with the established model, and the key factors producing the drift error are further discussed. It is proposed that the main approaches in reducing the drift error from stator are guaranteeing the rotor envelope surface to be an ideal spherical and improving the controlling precision of rotor displacement. The common problems associated in a gyroscope with a spherical rotor can be effectively resolved by the proposed method. This analysis provides a reference for the structure optimization and error compensation of a MSSG.
Chao-Jun Xin,Yuan-Wen Cai,Yuan Ren,Ya-Hong Fan 대한전기학회 2018 Journal of Electrical Engineering & Technology Vol.13 No.2
The aim of this paper is to design a centrifugal deformation error compensation method with guaranteed performance that allows angular velocity measurement of the magnetically suspended sensitive gyroscopes (MSSGs). The angular velocity measurement principle and the structure of the MSSG are described, and the analytical model of errors caused by MSSG rotor centrifugal deformation is established. Then, an on-line rotor centrifugal deformation error compensation method based on measurement of rotor spinning speed in real-time has been designed. The common issues caused by centrifugal deformation of spinning rotors can be effectively resolved by the proposed method. Comparative experimental results before and after compensation demonstrate the validity and superiority of the error compensation method.
Jun-Wei Zhu,Chao-Yang Liang,De-Feng He,Xin Wang 제어·로봇·시스템학회 2021 International Journal of Control, Automation, and Vol.19 No.4
This paper studies the secure consensus control problem of multi-agent systems under DoS attacks onthe sensor, the actuator, and the communication topology. A resilient intermediate estimator based attack tolerantcontrol strategy is proposed. By fully exploiting the hardware redundancies, both of the estimators and the controlprotocols can be reconstructed online according to different DoS attack scenarios. Finally, the experiment results ofthe networked multi-axis motion control system are given to verify the effectiveness of the proposed method.
Study of seismic performance and favorable structural system of suspension bridges
Xin-Jun Zhang,Chao Zhang 국제구조공학회 2016 Structural Engineering and Mechanics, An Int'l Jou Vol.60 No.4
By taking the Runyang Highway Bridge over the Yangtze River with 1490 m main span as example, structural response of the bridge under the horizontal and vertical seismic excitations is investigated by the response spectrum and time-history analysis of MIDAS/Civil software respectively, the seismic behavior and the influence of structural nonlinearity on the seismic response of the bridge are revealed. Considering the aspect of seismic performance, the suitability of employing the suspension bridge in super long-span bridges is investigated as compared to the cable-stayed bridge and cable-stayed-suspension hybrid bridge with the similar main span. Furthermore, the effects of structural parameters including the span arrangement, the cable sag to span ratio, the side to main span ratio, the girder height, the central buckle and the girder support system etc on the seismic performance of the bridge are investigated by the seismic response spectrum analysis, and the favorable earthquake-resistant structural system of suspension bridges is also discussed.
( Xin Gang Cui ),( Dan Feng Xu ),( Chao Lv ),( Fa Jun Qu ),( Jin He ),( Ming Chen ),( Yu Shan Liu ),( Yi Gao ),( Jian Ping Che ),( Ya Cheng Yao ),( Hong Yu Yu ) 생화학분자생물학회(구 한국생화학분자생물학회) 2011 BMB Reports Vol.44 No.8
MED19 is a member of the Mediator that plays a key role in the activation and repression of signal transduction or the regulation of transcription in carcinomas. To tested the functional role of MED19 in human prostate cancer, we downregulated MED19 expression in prostate cancer cells (PC-3 and DU145) by lentivirus- mediated short hairpin (shRNA), and analyzed the effect of inhibition of MED19 on prostate cancer cell proliferation and tumorigenesis. The in vitro prostate cancer cell proliferation, colony formation, and in vivo tumor growth in nude mice xenografts was significantly reduced after the downregulation of MED19. Knock- down of MED19 caused S-phase arrest and induced apoptosis via modulation of Bid and Caspase 7. It was suggested that MED19 serves as a novel proliferation regulator that promotes growth of prostate cancer cells. [BMB reports 2011; 44(8): 547-552]
Hui-Chao Hu,Hui-Jun Jin,Xin-Sheng Chai 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.1
This paper reports an improved headspace gas chromatographic (HS-GC) technique for thedetermination of oxalate content in bleaching effluents. The method is based on the redox reactionbetween potassium iodate and oxalate, from which the carbon dioxide is generated and measured by HSGC. The results showed that the reaction in a sulfuric acid solution (0.05 mol/L) was complete in 35 minat 95 ℃. The RSD of the method in the repeatability testing was less than 4.5%, the LOQ was 0.35 mg, andthe recovery ranged from 95 to 103%. The present method is simpler, more reliable, and more practicalcompared to the methods reported previously.
A new family of spatial 3-DOF parallel manipulators with two translational and one rotational DOFs
Liu, Xin-Jun,Wang, Jinsong,Wu, Chao,Kim, Jongwon Cambridge University Press 2009 Robotica Vol.27 No.2
<B>SUMMARY</B><P>This paper proposes a new family of spatial 3-DOF (degree of freedom) parallel manipulators with two translational and one rotational DOFs. The manipulators in this family are the variations of the parallel manipulators, which are capable of very high rotational capability, introduced by X.-J. Liu, J. Wang, and G. Pritschow (“A new family of spatial 3-DoF fully parallel manipulators with high rotational capability,” <I>Mech. Mach. Theory</I>40(4), 475-494, 2005). However, compared with those old manipulators, the new parallel manipulators proposed here have the advantages of simpler kinematics and structure, easier manufacturing, and energy saving.</P>
( Liang Lei ),( Xin-fei Xu ),( Jiong-jie Yu ),( Ju-dong Li ),( Zhen-li Li ),( Jun Han ),( Han Zhang ),( Hao Xing ),( Han Wu ),( Ming-da Wang ),( Chao Li ),( Zheng Wang ),( Feng Shen ),( Meng-chao Wu ) 대한간학회 2018 춘·추계 학술대회 (KASL) Vol.2018 No.1
Aims: The prognosis of hepatocellular carcinoma (HCC) with portal vein tumor thrombus (PVTT) is very poor. According to the BCLC treatment recommendations, sorafenib or other palliative treatment (PT) is recommended as the first-line therapy when it happens. In real world, however, a significant number of selected patients with HCC and PVTT suffered from surgical resection (SR). Methods: PubMed, Embase, Medline and Cochrane library were searched for studies comparing SR with PT (including TACE, sorafenib, etc.) for HCC with PVTT, which were published before September 2017. Results: 4,810 patients from 7 studies were enrolled in this meta-analysis, which divided into the SR group (n = 2,344) and the PT group (n = 2476). When compared with the PT group, the pooled hazard ratio (HR) for the 1, 3 and 5-year OS rates of the SR group were 0.56 (95% CI 0.52-0.60, P=0.03), 0.56 (95% CI 0.53-0.59, P<0.001) and 0.55 (95% CI 0.54-0.57, P<0.001). For subgroup analysis, when compared with the mere TACE group, the pooled HR for the 1, 3 and 5-year OS rates of the SR group were 0.54 (95% CI 0.43-0.67, P=0.81), 0.75 (95% CI 0.65-0.87, P=0.25) and 0.76 (95% CI 0.67-0.88, P=0.25). Conclusions: This meta-analysis demonstrated SR had better OS than TACE or other palliative therapy for HCC with PVTT. SR may be suitable as the first-line treatment for selected patients with resectable HCC and removable PVTT.