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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.
Qing-Yuan Xu,Xiao-Dong Li,Mang-Mang Lv 제어·로봇·시스템학회 2016 International Journal of Control, Automation, and Vol.14 No.2
Almost all of the existing research achievements in Iterative Learning Control (ILC) hitherto have beenfocused on One-Dimensional (1-D) dynamical systems. Few ILC researches are related to Two-Dimensional FornasiniMarchesina Model (2-D FMM). In this paper, an adaptive ILC approach is proposed for 2-D FMM systemwith non-repetitive reference trajectory under random boundary condition. The proposed adaptive ILC algorithmlearns the coefficient matrices of the system and updates the control input iteratively. As the times of iteration goesto infinity, the ILC tracking error outside the boundary tends to zero and all system signals keep bounded in thewhole ILC process. Illustrative examples are provided to verify the validity of the proposed adaptive ILC algorithm.
Qing-Yuan Xu,Jing Cheng,Yun-Shan Wei,Kai Wan 제어·로봇·시스템학회 2023 International Journal of Control, Automation, and Vol.21 No.9
In this paper, an adaptive iterative learning control (ILC) design method is proposed for a class of nonlinear discrete-time systems with nonaffine structure, randomly varying trail length, and uncertain control direction. In order to achieve repetitive tracking control of the nonaffine structure systems with uncertain control direction, randomly varying trail length, and other uncertainties, we apply a high-order neural network to approximate the expected system input. Then, a novel adaptation law is designed for the neural network weight vector. The main feature of the method proposed in this paper is that the weight vector norm instead of the weight vector itself is updated iteratively to realize the successive approximation of the expected system input, the custom-designed identification mechanism is not necessary to deal with the uncertain control direction, and the analysis of randomly varying trail lengths problem is strictly established. The convergence of the proposed adaptive ILC is set up by a composite energy function. The effectiveness of the proposed adaptive ILC design is validated by two simulation examples.
Yuan, Zi-Xu,Ma, Teng-Hui,Zhong, Qing-Hua,Wang, Huai-Ming,Yu, Xi-Hu,Qin, Qi-Yuan,Chu, Li-Li,Wang, Lei,Wang, Jian-Ping Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.2
Radiation proctitis is a common complication after radiotherapy for pelvic malignant tumors. This study was conducted to assess the efficacy of novel almagate enemas in hemorrhagic chronic radiation proctitis (CRP) and evaluate risk factors related to rectal deep ulcer or fistula secondary to CRP. All patients underwent a colonoscopy to confirm the diagnosis of CRP and symptoms were graded. Typical endoscopic and pathological images, risk factors, and quality of life were also recorded. A total of 59 patients were enrolled. Gynecological cancers composed 93.1% of the primary malignancies. Complete or obvious reduction of bleeding was observed in 90% (53/59) patients after almagate enema. The mean score of bleeding improved from 2.17 to 0.83 (P<0.001) after the enemas. The mean response time was 12 days. No adverse effects were found. Moreover, long-term successful rate in controlling bleeding was 69% and the quality of life was dramatically improved (P=0.001). The efficacy was equivalent to rectal sucralfate, but the almagate with its antacid properties acted more rapidly than sucralfate. Furthermore, we firstly found that moderate to severe anemia was the risk factor of CRP patients who developed rectal deep ulcer or fistulas (P= 0.015). We also found abnormal hyaline-like thick wall vessels, which revealed endarteritis obliterans and the fibrosis underlying this disease. These findings indicate that almagate enema is a novel effective, rapid and well-tolerated method for hemorrhagic CRP. Moderate to severe anemia is a risk factor for deep ulceration or fistula.
THE APPLICATION OF THE ADAPTIVE NOISE ELIMINATOR IN OIL LOGGING
Xu, Song Yuan,Zhou, Wei Dong,Xu, Shao Qing 대한전자공학회 1992 HICEC:Harbin International Conference on Electroni Vol.1 No.1
This paper presents the principle of the adaptive noise eliminator, addaptive algorithm, and simulation results. The simulation results display that useful signals can be efficiently extracted from strong noises by the adaptive noise eliminator on the condition that we have little prior knowledge about signal and noises.
Synthesis, Antibacterial Activity, and Structure–Activity Relationship of Fusaric Acid Analogs
Qing-Yan Zhang,Yang Fei‐Yu,Liao Shang‐Gao,Wang Bing,Li Rui,Dong Yong‐Xi,Zhou Meng,Yang Yuan‐Yong,Xu Guo‐Bo 대한화학회 2021 Bulletin of the Korean Chemical Society Vol.42 No.4
Forty-one fusaric acid analogs possessing a pyridine carboxylic acid scaffold have been synthesized. The antibacterial activity results demonstrated that compounds 5b, 7b, 8c, and 8d displayed strong antibacterial activities against Staphylococcus aureus ATCC25923 with minimum inhibitory concentrations (MICs) of 4–16 μg/mL. Molecular docking study indicated that these compounds have strong hydrogen-bonding interactions with TyrRS. Meanwhile, 8c and 8d showed promising antibacterial activities against Pseudomonas aeruginosa ATCC9027. Compound 4 exhibited pronounced antibacterial activities against a clinically isolated multidrug-resistant strain of Escherichia coli (MIC: 64 μg/mL as compared 64 μg/mL of levofloxacin and 1024 μg/mL of ceftriaxone sodium). Moreover, compound 17e displayed strong synergistic antibacterial effect with levofloxacin against the multidrug-resistant strain, decreasing the MIC value of levofloxacin to 1/16 of its original MIC. No obvious cytotoxic activities against LO2 was observed for compounds 4, 5b, 8c, 8d, 17d, and 17e at 50 μM. The preliminary structure–activity relationship of fusaric acid analogs was also discussed.
Yuan Lei,Qing Yi,Jiang Yun-hao,Xu An-fei 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.2
To address the neutral-point voltage imbalance problem of three-level NPC converters, a novel neutral-point voltage balance control algorithm based on virtual space vector is proposed. The method reoptimizes the partitioning and reduces the 6 small sectors in the conventional virtual space vector pulse width modulation algorithm to 5 small sectors, reducing the computational effort. Meanwhile, the regulation factor of neutral-point voltage is introduced, and the influence of virtual vector on the neutral-point voltage is used to fine-tune the size of the regulation factor, and the neutral-point voltage is controlled by a kind of hysteresis loop control for neutral-point voltage balancing. Simulation and experimental results show that the algorithm has a good neutral-point voltage balancing effect.
Qing Liu,Yuan Liu,Xinwen Wang,Jie Xu,Wei Zhou 한국유전학회 2015 Genes & Genomics Vol.37 No.9
Oral lichen planus (OLP) is a common inflammatory oral mucosal disease and a potential premalignant status of oral squamous cell carcinoma. This study aims to explore the molecular mechanisms of OLP. The gene expression dataset (GSE38616) of OLP tissues and healthy controls was downloaded from Gene Expression Omnibus database. After preprocessing the raw data through affy package, limma package was utilized to identify differentially expressed genes (DEGs) (criteria: p B 0.05 and |log2 fold change| C 2). Then, functional and pathway enrichment analyses were performed by using DAVID software (criterion: p value \0.1). Besides, STRING sever was utilized to investigate protein–protein interactions (PPIs) based on which PPI network was constructed (criterion: combined score [0.4). Finally, the transcription factor binding sites (TFBSs) of DEGs were predicted through WGRV software (criterion: p value \0.0001). A total of ten DEGs were identified, including two down-regulated and eight up-regulated DEGs, which were enriched in nine functions mainly about keratinization, differentiation and development of keratinocyte and epithelium. Besides, PPI network was constructed, and CXCL13 was a hub gene. Furthermore, four conserved TFBSs (AR, dlx3, ALX-3, and Msx-1) were co-existed in SLC6A14, CXCL13, and CDSN. CDSN, LCE3D, LCE3E, and SPRR2B might play a role in OLP through participating in keratinization, differentiation and development of keratinocyte and epithelium, while EIF1AY, WFDC12, and CXCL13 might participate in OLP through regulating inflammation and immunity. These predictions might promote the understanding of OLP mechanism. However, further studies are required to validate the bioinformatics outcomes.