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Study of Robustness Approximate Time-Optimal System
Xu, Song Yuan,Yao, Li Qiang,Rong, Hong Bing,Xu, Shao Qing 대한전자공학회 1992 HICEC:Harbin International Conference on Electroni Vol.1 No.1
Using the $quot;bang-bang$quot;control the system can obtain the optimal time. But there have the chatter and the bad robustness after considering the practical factors. If we use the chang structure principle, the chatter will be diminated and the system will get the strong robustness. This paper adopted this two kinds of the principles to design the satellite attitute control system and the satisfied results were received.
Xu Rong,Chen Yu-Hui,Xia Ju-Fei,Zeng Ting-Xiao,Li Yong-He,Zhu Jia-Ying 한국응용곤충학회 2021 Journal of Asia-Pacific Entomology Vol.24 No.2
Nutrient metabolism is crucial for the survival of insects through the diapause. However, little is known about the metabolic mechanism of prolonged diapause. The sawfly, Cephalcia chuxiongica (Hymenoptera: Pamphilii�dae), is a notorious defoliator of pine trees in southwest China. One of the distinguishing biological character�istics of this pest is the prolonged diapause of about 1.5 years. In this study, the body lipid, carbohydrate (total body sugar, glycogen, trehalose, and glucose), protein, and glycerol contents were measured in diapausing larvae of C. chuxiongica. The results showed that the changes of biochemical composition in C. chuxiongica are asso�ciated with the diapause initiation, maintenance, and termination phases. During the initiation phase, trehalose, glucose, and glycerol increased significantly, but glycogen decreased sharply. In general, the lipid, carbohydrate, and glycerol levels decreased gradually across the maintenance phase. At termination phase, the contents of glycogen and lipid persistently decreased, while an increase of trehalose, glucose, and glycerol contents were detected. The protein level was significantly higher at maintenance phase than at initiation and termination phases. It was also found that elevation of trehalose, glucose, and glycerol contents occurred in winter. These implies that the metabolites with altered levels in diapausing larvae of C. chuxiongica are responsible for maintaining a prolonged development and overwintering.
A New Approach for Modeling and Computation of Dynamics of Robots Containing Closed Chains
Xu,Xiang-Rong,Ma,Xiang-Feng,Choi,Young-Hyu,Chung,Won-Jee 창원대학교 공작기계기술연구센터 1999 연구업적집 Vol.1 No.1
This paper presents a new recursive algorithm of robot dynamics based on the Kane's dynamic equations and Newton-Euler formulations. Differing from Kane's work, the algorithm is general-propose and can be easily realized on computers. It is suited not only for robots with all rotary joints but also for robots with some prismatic joints Formulations of the algorithm keep the recurrence characteristics of the Newton-Euler formulations, but possess stronger physical significance. Unlike the conventional algorithms, such as the Lagrange and Newton-Euler algorithm, etc, the algorithm can be used to deal with dynamics of robots containing closed chains without cutting the closed chains open. In addition, this paper makes a comparison between the algorithm and those conventional algorithms from the number of multiplications and additions.
A Method for the Analysis of Robot Dynamics
Xu, Xiang-Rong,Choi, Young-Hyu,Chung, Won-Jee,Ma, Xiang-Feng 國立 昌原大學校 産業技術硏究所 1998 産技硏論文集 Vol.12 No.-
이 논문은 Kane의 동역학 방정식에 기초한 로봇 동역학의 새로운 循環 알고리즘을 제시한다. 이 알고리즘은 Kane의 동역학 방정식과 뉴톤-오일러 공식을 이용하여 얻어진다. 라그랑지-오일러(L-E)와 뉴우톤-오일러(N-E) 등과 같은 전통적 알고리즘과는 달리, 제안된 알고리즘은 간단하면서 確然하고, 閉체인을 그대로 포함된 로봇의 동역학을 푸는데 사용되어진다. 또한 이 알고리즘은 循環형태로 표현되어서 컴퓨터상에 구현하기 쉽기 때문에 로봇의 CAD(Computer0Aided Design)에 적합하다.
A New Method for the Dynamic Analysis of Robots with Flexible Links
Xu,Xiang-Rong,Choi,Young-Hyu,Chung,Won-Jee 창원대학교 공작기계기술연구센터 1999 연구업적집 Vol.1 No.1
본 논문은 로봇 매니퓰레이터의 운동학적 탄성동역학 해석을 위한 새로운 방법을 제시한다. 분산 매개변수 방법에 기초하여 유연한 링크를 갖는 로봇 매니퓰레이터의 일반적인 운동 방정식을 유도하였다. 운동방정식의 결과식은 비선형 강체와 탄성운동 커플링 항을 갖는 일반 복합탄성 매니퓰레이터를 모델링하는 데 사용되어질 수 있다. 본 논문에서 제안된 방법은 계산적으로 효과적이며 로봇 매니퓰레이터 및 공간메커니즘의 유연성 해석에 이용될 수 있다.
Luciferase Assay to Screen Tumour-specific Promoters in Lung Cancer
Xu, Rong,Guo, Long-Jiang,Xin, Jun,Li, Wen-Mao,Gao, Yan,Zheng, You-Xian,Guo, You-Hong,Lin, Yang-Jun,Xie, Yong-Hua,Wu, Ya-Qing,Xu, Rui-An Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.11
Objective: Specific promoters could improve efficiency and ensure the safety of gene therapy. The aim of our study was to screen examples for lung cancer. Methods: The firefly luciferase gene was used as a reporter, and promoters based on serum markers of lung cancer were cloned. The activity and specificity of seven promoters, comprising CEACAM5 (carcinoembryonic antigen, CEA), GRP (Gastrin-Releasing Peptide), KRT19 (cytokeratin 19, KRT), SFTPB (surfactant protein B, SP-B), SERPINB3 (Squamous Cell Carcinoma Antigen, SCCA), SELP (Selectin P, Granule Membrane Protein 140kDa, Antigen CD62, GMP) and DKK1 (Dickkopf-1) promoters were compared in lung cancer cells to obtain cancer-specific examples with strong activity. Results: The CEACAM5, DKK1, GRP, SELP, KRT19, SERPINB3 and SFTPB promoters were cloned. Furthermore, we successfully constructed recombinant vector pGL-CEACAM5 (DKK1, GRP, SELP, KRT19, SERPINB3 and SFTPB) contained the target gene. After cells were transfectedwith recombinant plasmids, we found that the order of promoter activity from high to low was SERPINB3, DKK1, SFTPB, KRT19, CEACAM5, SELP and GRP and the order for promoters regarding specificity and high potential were SERPINB3, DKK1, SELP, SFTPB, CEACAM5, KRT19 and GRP. Conclusion: The approach adopted is feasible to screen for new tumour specific promoters with biomarkers. In addition, the screened lung-specific promoters might have potential for use in lung cancer targeted gene therapy research.
Xu, Rong,He, Xiaolei,Wufuli, Reyina,Su, Ying,Ma, Lili,Chen, Ru,Han, Zhongcheng,Wang, Fang,Liu, Jiang The Korean Gastric Cancer Association 2019 Journal of gastric cancer Vol.19 No.4
Purpose: To study the efficacy of capecitabine or S-1 plus oxaliplatin (CAPOX or SOX) for treating thymidine phosphorylase (TP)- or dihydropyrimidine dehydrogenase (DPD)-positive advanced gastric cancer. Materials and Methods: Eighty-six patients with stage IIIC to IV gastric cancer were assessed for TP and DPD expression by immunohistochemistry. The association between CAPOX or SOX efficacy and TP/DPD expression was retrospectively analyzed. Results: There were no significant differences in the objective remission rate (ORR, 52.27% vs. 47.62%; P>0.05), disease control rate (72.73% vs. 73.81%, P>0.05), progression-free survival (hazard ratio [HR], 1.119; 95% confidence interval [CI], 0.739-1.741; P=0.586), and overall survival (OS; HR, 0.855; 95% CI, 0.481-1.511; P=0.588) between CAPOX and SOX. A higher number of stage IV patients showed TP positivity, while DPD-positive patients predominantly showed intestinal type of gastric cancer. In TP-positive patients, the ORRs associated with CAPOX and SOX treatments were 57.14% and 38.10%, respectively; OS was better with CAPOX than with SOX (HR, 0.447; 95% CI, 0.179-0.978; P=0.046). Among DPD-positive patients, the SOX treatment-associated ORR (60.87%) was significantly higher than the CAPOX treatment-associated ORR (43.48%). Furthermore, SOX treatment resulted in better OS than did CAPOX treatment (HR, 2.020; 95% CI, 1.019-4.837; P=0.049). Conclusions: No significant difference in clinical efficacy was found between CAPOX and SOX. TP-positive patients might respond better to CAPOX while DPD-positive patients may respond better to SOX. Our findings might serve as a guide for personalized chemotherapy for gastric cancer.
Improved Model Predictive Control for H-bridge Cascaded STATCOM
Xu Rong,Yu Yong,Wu Jian,Yang Rongfeng,Xu Dianguo,Chen He,Yu Yannan,Ni Ronggang 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
H-bridge cascaded static synchronous compensator (STATCOM) is often used to compensate the harmonic and reactive current derived from non-linear load. In order to improve the performance of STATCOM, an improved model predictive control (MPC) method is put forward in this paper. In the proposed MPC, the difference equations which are derived from the transfer functions of controlling variables and controlled variables in STATCOM are used as the predictive control model, the error between the output of STATCOM and predictive model is used to design feedback correction controller and rolling optimization controller. Meanwhile, the introduced repetitive controller is used to eliminate the inherent steady error. The actual H-bridge cascaded STATCOM is constructed and a series of verification tests are executed. The experimental results prove that the output voltage and current of H-bridge cascaded STATCOM with the proposed MPC have smaller distortion and better sinusoidal shape than those of the traditional Proportion Integral (PI) control. Moreover, the performance of H-bridge cascaded STATCOM is great in high power experiment.