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- 저자 : ( Zhiqin Chen ) (검색결과 3 건)
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Clinical analysis of 117 cases with synchronous multiple primary esophageal squamous cell carcinomas
( Zhiqin Chen ),( Sihan Li ),( Zheng He ),( Guang Li ) 대한내과학회 2021 The Korean Journal of Internal Medicine Vol.36 No.6
Background/Aims: We aimed to study the clinical characteristics, treatment modality, and the prognosis of synchronous multiple primary esophageal squamous cell carcinomas (SMPESCC). Methods: A total of 117 SMPESCC cases were evaluated retrospectively from 2010 to 2015. Results: The most common locations of SMPESCC were mid- and lower thoracic segments (n = 208, 84.9%). The 1-, 2-, and 3-year overall survival rates were 53.8%, 30.8%, and 15.4%, respectively; the median survival time (MST) was 12.5 months. With definitive radiotherapy and surgery, respectively, the MST of stage I/II patients were 34.2 and 26.7 months, of stage III patients were 8.3 and 13.2 months (p = 0.163), and of stage IV patients were and 8 and 12.6 months (p = 0.379). Clinical stage, family history of cancer, and Karnofsky performance status were independent prognostic factors for the whole cohort by Cox multivariate regression analysis (hazard ratio [HR] = 0.859, p < 0.001; HR = 0.579, p = 0.032; and HR = 0.586, p = 0.013). Conclusions: Although the prognosis of SMPESCC is poor, stage I/II patients can achieve long-term survival with aggressive treatment, especially those with a Karnofsky performance score 90 or higher and who have no family history of cancer. Definitive radiotherapy could achieve a similar survival rate to definitive surgery at different clinical stages.
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Resonance Parameter of Variable Mode LLC Converter for Auxiliary Converter
XiaoQiong He,Yang Chen,Chen Chen,ZhiQin Zhao,PengCheng Han 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
A precise modeling and resonant calculation method are proposed for variable mode LLC resonant converter. With normal operation of the converter, the redundancy of components is reduced. By establishing equivalent circuit model considering device characteristics, DC gain function is deduced. The resonant parameters are solved by simulated annealing algorithm. The DC gain obtained by the general algorithm and the proposed algorithm are compared. The stable operation of the converter is realized by using the control strategy of digital voltage controlled oscillator and intermittent modulation strategy. The feasibility of this research is verified by simulation and experiment.
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An Improved Consistent Subspace Identification Method Using Parity Space for State-space Models
Jie Hou,Fengwei Chen,Penghua Li,Zhiqin Zhu,Fei Liu 제어·로봇·시스템학회 2019 International Journal of Control, Automation, and Vol.17 No.5
In this paper, an alternative consistent subspace identification method using parity space is proposed. The future/past input data and the past output data are used to construct the instrument variable to eliminate thenoise effect on consistent estimation. The extended observability matrix and the triangular block-Toeplitz matrixare then retrieved from a parity space of the noise-free matrix using a singular value decomposition based method. The system matrices are finally estimated from the above estimated matrices. The consistency of the proposedmethod for estimation of the extended observability matrix and the triangular block-Toeplitz matrix is established. Compared with the classical SIMs using parity space like SIMPCA and SIMPCA-Wc, the proposed method generallyenhances the estimated model efficiency/accuracy thanks to the use of future input data. Two examples arepresented to illustrate the effectiveness and merit of the proposed method.
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