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Peng, Xu,Yu, Le,Gong, Kaiyue,Liu, Xiaohan,Yang, Guolong,Xu, Jiangjun,Zhou, Chao,Gao, Lixia,Zhu, Xinyu The Korean Institute of Power Electronics 2021 JOURNAL OF POWER ELECTRONICS Vol.21 No.8
An aircraft ground power unit (GPU) can replace the auxiliary power unit (APU) in an aircraft while the aircraft is parked at an airport. Therefore, the problems associated with the oil consumption and air pollution of the APU are solved. However, the GPU is faced with challenges in terms of utilization, power quality, and fault tolerance. Thus, a novel centralized aircraft GPU based on a three-level neutral point clamped cascaded converter (3LNPC-CC) is introduced in this paper to improve utilization and power quality. Furthermore, an evaluation voltage balance strategy is proposed for the DC-port fault tolerance of the 3LNPC-CC. In addition, both the modulation of the phase shift pulse width modulation (PSPWM) and the control of the double closed loop are used in the 3LNPC-CC. A simulation platform including the control, modulation, and fault tolerance of the system is established to verify the feasibility and performance of the proposed GPU. In particular, it is used to evaluate the voltage balance strategy for DC-port faults. Moreover, a prototype of the GPU and relevant experiments are completed to verify the correctness and feasibility of the system and the strategy.
Kaiyue Wang,Lijuan Shi,Zheren Huang,Yun Xu 대한배뇨장애요실금학회 2022 International Neurourology Journal Vol.26 No.3
Purpose: The aim of this retrospective study was to compare the anatomical and functional outcomes between bilateral sacrospinous hysteropexy (BSHP) and bilateral sacrospinous ligament fixation with vaginal hysterectomy (BSLF/VH) in women with apical-predominant uterovaginal prolapse. Methods: Clinical data from patients with symptomatic Pelvic Organ Prolapse-Quantification (POP-Q) stage 2 or higher uterovaginal prolapse who underwent either BSHP (48 patients) or BSLF/VH (69 patients) between January 2014 and December 2018 were reviewed retrospectively. The primary outcome was the subjective satisfaction rate evaluated by Patient Global Impression of Improvement, and the secondary outcomes included objective anatomical success rates, impact on disease-specific quality of life evaluated by the Pelvic Organ Prolapse/Urinary Incontinence Sexual Questionnaire-12, Pelvic Floor Distress Inventory-Short Form 20, and Pelvic Floor Impact Questionnaire 7, and surgical complications. Results: After a median follow-up of 35 months (range, 25–58 months), all patients in both groups demonstrated significant postoperative improvements in anatomical and functional outcomes (P<0.001). There were no significant differences in postoperative subjective and objective results, sexual satisfaction outcomes, or disease-specific quality of life between the BSHP and BSLF/VH groups, and similar incidence rates of intraoperative and postoperative complications were also recorded. Conclusions: The uterus-sparing BSHP procedure yielded noninferior anatomical and functional outcomes compared to the BSLF/VH procedure and could be adopted as an alternative to conventional hysterectomy-based native-tissue repair modalities for symptomatic apical-predominant uterovaginal prolapse.
Analysis of capabilities and application characteristic of AIS
WANG shiyuan,XU kaiyu,XU zhijing,HU wenhua 한국항해항만학회 2006 한국항해항만학회 학술대회논문집 Vol.2006 No.-
This paper compares and analyzes the capabilities and application characteristic between the shipborne AIS and ARPA Radar、AIS base station and VTS Radar, give a brief introduction of the AIS base station network’s building and application in China, and give a discussion on the information fusion and technology integrated of AIS and ARPA Radar, AIS base station network and VTS Radar.
Study on the doping mechanism and electronic structure for Nb5+ doping PbWO4 crystals
Teng Chen,Kaiyu Xu,Dongli Shi,Mingjie Wang,Tingyu Liu 한국물리학회 2010 Current Applied Physics Vol.10 No.1
The existing forms of the impurity Nb5+ in the Nb5+:PbWO4 (PWO) crystals are simulated by computer technology. The possible various kinds of defects in the Nb5+:PWO crystals are also simulated. By analyzing the calculation results of defect formation energies and binding energies, the optimal substitution positions of the Nb5+ ions and the charge compensating mechanism [Nb-w+V2+ o +Nb-w] in the Nb5+:PWO crystals were obtained. The electronic structures for Nb5+:PWO were calculated with density functional theory code CASTEP. It shows that the doping of Nb5+ ions could suppress the 350 nm absorption band.
Xinyu Zhu,Xiao Liang,Kaiyue Gong,Xu Peng,Jun Cai,Xiaohan Liu,Chao Zhou,Siqi An,Chao Wu,Pengcheng Han 전력전자학회 2022 JOURNAL OF POWER ELECTRONICS Vol.22 No.12
As a vital component of power electronic transformers (PET), the reliability of a cascaded H-bridge rectifier (CHBR) is essential. Therefore, in this paper, a DC-port voltage balance strategy considering DC-port failure is researched to ensure the stable operation of a CHBR. However, if the DC-port voltage balance strategy is adopted to realize the single-phase balance of a CHBR, the three-phase currents become unbalanced. This paper uses a negative sequence control (NSC) strategy that is conducive to balancing DC-port voltage to achieve three-phase current balance. For the DC-port voltage balance, the matrix generation modulation (MGM) algorithm is proposed. In addition, the DC-port voltage balance boundary is analyzed to determine the range of the DC-port voltage balance in the CHBR. A 3-module cascading topology is adopted to demonstrate the MGM algorithm and the NSC strategy. Through experiments, results show the correctness and feasibility of the proposed strategy.
Xiaohan Liu,Xiao Liang,Kaiyue Gong,Siqi An,Xu Peng,Jun Cai,Xinyu Zhu,Chao Zhou 전력전자학회 2022 JOURNAL OF POWER ELECTRONICS Vol.22 No.8
The three-phase cascaded H-bridge rectifier (CHBR) is widely used in high power and high voltage applications. This paper focuses on the load removed from the DC port of a three-phase CHBR, which can cause single-phase DC-port voltage unbalance issues and three-phases DC-port voltage unbalance issues. This paper proposes a voltage balance control strategy based on negative sequence current injection for three-phase CHBR to deal with the unbalance problem. An individual DC-port voltage control strategy is designed to balance the DC-port voltage in the faulty phase. In addition, a negative sequence current injection control strategy is responsible for balancing the DC-port voltages in the three phase CHBR. The effectiveness and feasibility of the proposed voltage control strategy based on negative sequence current injection is verified by the experimental results.
Identification and expression analysis of SQUAMOSA promoter-binding protein (SBP) genes in mungbean
Zhang Huiying,Guo Xu,Wang Zheng,Yu Zhaohang,Nie Kaiyue,Han Meng,Xu Xuexin,Zhu Hong 한국식물생명공학회 2023 Plant biotechnology reports Vol.17 No.3
SQUAMOSA promoter-binding protein (SBP) genes are important transcription factors involved in plant growth and development. However, the information about mungbean VrSBP genes is limited. In this study, we identified and characterized 22 VrSBP genes in the mungbean genome. Many characteristics of VrSBP genes were analyzed, and most VrSBP genes were considered to be expressed only in the nucleus. VrSBP genes were grouped into 9 subfamilies, with the exception of the g7 and ms subfamilies which are distinctive to Poaceae species. The g3 subfamily was the largest one with 6 VrSBP members. Eight segmental events were found among VrSBP genes, and all VrSBP duplicated genes were evolved via purification selection. The gene structure of VrSBP genes in the same subfamily was similar, and the conserved motifs are different among different subfamilies of VrSBP genes. Additionally, 12 VrSBP genes were considered to be the target genes of vra-miR156a. The types and numbers of cis-acting elements in VrSBP promoters were varied and VrSBP genes showed different expression patterns in different tissues. In addition, the protein interaction network revealed that VrSBP genes were involved in many development processes. Our study has provided important information which will allow the further functional characterization of VrSBP genes.
Peng Pengfei,Yue Xun,Tang Lu,Wu Xi,Deng Qiao,Wu Tao,Cai Lei,Liu Qi,Xu Jian,Huang Xiaoqi,Chen Yucheng,Diao Kaiyue,Sun Jiayu 대한영상의학회 2023 Korean Journal of Radiology Vol.24 No.12
Objective: To clinically validate the feasibility and accuracy of cine images acquired through the multitasking method, with no electrocardiogram gating and free-breathing, in measuring left ventricular (LV) function indices by comparing them with those acquired through the balanced steady-state free precession (bSSFP) method, with multiple breath-holds and electrocardiogram gating. Materials and Methods: Forty-three healthy volunteers (female:male, 30:13; mean age, 23.1 ± 2.3 years) and 36 patients requiring an assessment of LV function for various clinical indications (female:male, 22:14; 57.8 ± 11.3 years) were enrolled in this prospective study. Each participant underwent cardiac magnetic resonance imaging (MRI) using the multiple breath-hold bSSFP method and free-breathing multitasking method. LV function parameters were measured for both MRI methods. Image quality was assessed through subjective image quality scores (1 to 5) and calculation of the contrast-to-noise ratio (CNR) between the myocardium and blood pool. Differences between the two MRI methods were analyzed using the Bland–Altman plot, paired t-test, or Wilcoxon signed-rank test, as appropriate. Results: LV ejection fraction (LVEF) was not significantly different between the two MRI methods (P = 0.222 in healthy volunteers and P = 0.343 in patients). LV end-diastolic mass was slightly overestimated with multitasking in both healthy volunteers (multitasking vs. bSSFP, 60.5 ± 10.7 g vs. 58.0 ± 10.4 g, respectively; P < 0.001) and patients (69.4 ± 18.1 g vs. 66.8 ± 18.0 g, respectively; P = 0.003). Acceptable and comparable image quality was achieved for both MRI methods (multitasking vs. bSSFP, 4.5 ± 0.7 vs. 4.6 ± 0.6, respectively; P = 0.203). The CNR between the myocardium and blood pool showed no significant differences between the two MRI methods (18.89 ± 6.65 vs. 18.19 ± 5.83, respectively; P = 0.480). Conclusion: Multitasking-derived cine images obtained without electrocardiogram gating and breath-holding achieved similar image quality and accurate quantification of LVEF in healthy volunteers and patients.