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Xuan, Zhu,Zhong, Zhao-Hui,Zhang, Xuan-Zhi,Zhang, Lei,Zhao, Xiao-Kun,Lv, Chen,Xu, Ran,Ren, Wei-Gang,Li, Song-Chao Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.3
To determine the relationship between comorbidity and outcome after radical cystectomy in Chinese patients by using the Adult Comorbidity Evaluation (ACE)-27 index. Two-hundred-and-forty-six patients treated with radical cystectomy at the Second Xiangya Hospital of Central South University, Hunan Province, China between 2000 and 2010 were retrospectively analyzed. Medical records were reviewed for age, gender, delayed time of radical cystectomy, urinary diversion type, pelvic lymphadenectomy status, TNM stage, and pathological grade. Comorbidity information was assessed by the ACE-27 index. The outcome measurement was overall survival. Univariate and multivariate Cox proportional hazards regression analyses were used to determine the association between comorbidity and outcome. The study population consisted of 215 (87.40%) males and 31 (12.60%) females with a mean age of $62{\pm}11$ years. Median duration of follow-up was $47{\pm}31$ months. A total of 151 (61.38%) patents died during follow-up. Of those, 118 (47.97%) had at least one comorbidity. According to the ACE-27 scores, 128 (52.03%) patients had no comorbidity, 79 (32.11%) had mild, 33 (13.41%) had moderate, and 6 (2.45%) had severe comorbidities. Multivariate analysis indicated that moderate (p=0.002) and severe (p<0.001) comorbidity was significantly associated with decreased overall survival. In addition, age ${\geq}70$ years (p=0.002), delayed time of radical cystectomy >12 weeks (p=0.044), pelvic lymphadenectomy status (p=0.014), and TNM stage >T3 (p<0.001) were determined to be independent risk factors of overall survival. Increasing severity of comorbidity statistically correlated with decreased overall survival after radical cystectomy.
Value distribution of meromorphic solutions of certain difference Painlevé equations
Chen, Zong-Xuan,Shon, Kwang Ho Elsevier 2010 Journal of mathematical analysis and applications Vol.364 No.2
<P><B>Abstract</B></P><P>The Borel exceptional value and the exponents of convergence of poles, zeros and fixed points of finite order transcendental meromorphic solutions for difference Painlevé <I>I</I> and <I>II</I> equations are estimated. And the forms of rational solutions of the difference Painlevé <I>II</I> equation and the autonomous difference Painlevé <I>I</I> equation are also given. It is also proved that the non-autonomous difference Painlevé <I>I</I> equation has no rational solution.</P>
Modeling and Analysis of an Avionic Battery Discharge Regulator
Chen, Qian,Yu, Haihong,Huang, Xiaoming,Lu, Yi,Qiu, Peng,Tong, Kai,Xuan, Jiazhuo,Xu, Feng,Xuan, Xiaohua,Huang, Weibo,Zhang, Yajing The Korean Institute of Power Electronics 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.3
The avionic battery discharge regulator (BDR) plays an important role in a power-conditioning unit. With its merits of high efficiency, stable transfer function, and continuous input and output currents, the non-isolated Weinberg converter (NIWC) is suitable for avionic BDR. An improved peak current control strategy is proposed to achieve high current-sharing accuracy. Current and voltage regulators are designed based on a small signal model of a three-module NIWC system. The system with the designed regulators operates stably under any condition and achieves excellent transient response and current-sharing accuracy.
『Research on the Inheritance of Qingshan Suona Horn in Hunan from the Perspective of Dictation』
( Chen Xuan ) 인문사회과학예술융합학회 2018 인문사회과학예술융합학회지 Vol.2 No.2
Qingshan Suona Horn is a popular folk art form in Qingshanqiao District, Shigu Town, and Fenshui, Xiangtan County, Hunan Province. In 2006, it was listed as the first group of intangible cultural heritage of the country. Inheritors are important carriers and transmitters of intangible cultural heritage. By documenting the dictated records of the inheritors, and combining historical literature, it is helpful for us to understand Qingshan Suona Horns comprehensively. At the same time, this unique folk art needs more inheritors to carry it on.