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| 1 | A Novel Robust Attitude Control for Quadrotor Aircraft Subject to Actuator Faults and Wind Gusts显示文摘A novel robust fault tolerant controller is developed for the problem of attitude control of a quadrotor aircraft in the presence of actuator faults and wind gusts in this paper.Firstly, a dynamical system of the quadrotor taking into account aerodynamical effects induced by lateral wind and actuator faults is considered using the Newton-Euler approach. Then,based on active disturbance rejection control(ADRC), the fault tolerant controller is proposed to recover faulty system and reject perturbations. The developed controller takes wind gusts,actuator faults and measurement noises as total perturbations which are estimated by improved extended state observer(ESO)and compensated by nonlinear feedback control law. So, the developed robust fault tolerant controller can successfully accomplish the tracking of the desired output values. Finally, some simulation studies are given to illustrate the effectiveness of fault recovery of the proposed scheme and also its ability to attenuate external disturbances that are introduced from environmental causes such as wind gusts and measurement noises. | Yuying Guo Bin Jiang Youmin Zhang | 2018 | IEEE/CAA Journal of Automatica Sinica2018，5，1： | 18 |
| 2 | Quantitative computed tomography analysis for stratifying the severity of Coronavirus Disease 2019显示文摘To examine the feasibility of using a computer tool for stratifying the severity of Coronavirus Disease 2019(COVID-19)based on computed tomography(CT)images.We retrospectively examined 44 confirmed COVID-19 cases.All cases were evaluated separately by radiologists(visually)and through an in-house computer software.The degree of lesions was visually scored by the radiologist,as follows,for each of the 5 lung lobes:0,no lesion present;1,<1/3 involvement;2,>1/3 and<2/3 involvement;and 3,>2/3 involvement.Lesion density was assessed based on the proportion of ground-glass opacity(GGO),consolidation and fibrosis of the lesions.The parameters obtained using the computer tool included lung volume(mL),lesion volume(mL),lesion percentage(%),and mean lesion density(HU)of the whole lung,right lung,left lung,and each lobe.The scores obtained by the radiologists and quantitative results generated by the computer software were tested for correlation.A Chi-square test was used to test the consistency of radiologist-and computer-derived lesion percentage in the right/left lung,upper/lower lobe,and each of the 5 lobes.The results showed a strong to moderate correlation between lesion percentage scores obtained by radiologists and the computer software(r ranged from 0.7679 to 0.8373,P<0.05),and a moderate correlation between the proportion of GGO and mean lesion density(r=-0.5894,P<0.05),and proportion of consolidation and mean lesion density(r=0.6282,P<0.05).Computer-aided quantification showed a statistical significant higher lesion percentage for lower lobes than that assessed by the radiologists(x^2=8.160,P=0.004).Our experiments demonstrated that the computer tool could reliably and accurately assess the severity and distribution of pneumonia on CT scans. | Cong Shen Nan Yu Shubo Cai Jie Zhou Jiexin Sheng Kang Liu Heping Zhou Youmin Guo Gang Niu | 2020 | Journal of Pharmaceutical Analysis2020，10，2： | 13 |
| 3 | Novel robust fault diagnosis method for flight control systems显示文摘A novel robust fault diagnosis scheme, which possesses fault estimate capability as well as fault diagnosis property, is proposed. The scheme is developed based on a suitable combination of the adaptive multiple model (AMM) and unknown input observer (UIO). The main idea of the proposed scheme stems from the fact that the actuator Lock-in-Place fault is unknown (when and where the actuator gets locked are unknown), and multiple models are used to describe different fault scenarios, then a bank of unknown input observers are designed to implement the disturbance de-coupling. According to Lyapunov theory, proof of the robustness of the newly developed scheme in the presence of faults and disturbances is derived. Numerical simulation results on an aircraft example show satisfactory performance of the proposed algorithm. | Guo Yuying Jiang Bin Zhang Youmin Wang dianfei | 2008 | Journal of Systems Engineering and Electronics2008，19，5： | 10 |
| 4 | Apparent diffusion coefficient in normal and abnormal pattern of intervertebral lumbar discs: initial experience显示文摘The aim of the present study was to compare the relationship of morphologically defined non-bulging/herni-ated, bulging and herniated intervertebral lumbar discs with quantitative apparent diffusion coefficient (ADC). Thirty-two healthy volunteers and 28 patients with back pain or sciatica were examined by MRI. All intervertebral lumbar discs from L1 to S1 were classified according to morphological abnormality and degenerated grades. The ADC values of nucleus pulposus (NP) were measured and recorded. The significant differences about mean ADC values of NP were found between non-bulging/herniated discs and bulging discs as well as herniated discs (P < 0.05), whereas there were no significant differences in ADC values between bulging and herniated discs (P > 0.05). Moreover, statistically significant relationship was found in the mean ADC values of NP between 'non-bulging/herniated and non-degenerated discs' and 'non-bulging/herniated degenerated discs' as well as herniated discs (P < 0.05). Linear regression analysis between ADC value and disc level revealed an inverse correlation (r = -0.18). The ADC map of the NP is a potentially useful tool for the quantitative assessment of componential and molecular alterations accompanied with lumbar disc abnormalities. | Gang Niu Xuewen Yu Jian Yang Rong Wang Shaojuan Zhang Youmin Guo | 2011 | The Journal of Biomedical Research2011，25，3： | 7 |
| 5 | Effect of grain refinement induced by wire and arc additive manufacture (WAAM) on the corrosion behaviors of AZ31 magnesium alloy in NaCl solution显示文摘Additive manufacturing(AM)of Mg alloys has become a promising strategy for producing complex structures,but the corrosion performance of AM Mg components remains unexploited.In this study,wire and arc additive manufacturing(WAAM)was employed to produce single AZ31 layer.The results revealed that the WAAM AZ31 was characterized by significant grain refinement with non-textured crystallographic orientation,similar phase composition and stabilized corrosion performance comparing to the cast AZ31.These varied corrosion behaviors were principally ascribed to the size of grain,where cast AZ31 and WAAM AZ31 were featured by micro galvanic corrosion and intergranular corrosion,respectively. | Jianwei LI Youmin QIU Junjie YANG Yinying SHENG Yanliang YI Xun ZENG Lianxi CHEN Fengliang YIN Jiangzhou SU Tiejun ZHANG Xin TONG Bin GUO | 2023 | Journal of Magnesium and Alloys2023，11，1： | 6 |
| 6 | The diagnostic rules of peripheral lung cancer preliminary study based on data mining technique显示文摘Objective: To discuss the clinical and imaging diagnostic rules of peripheral lung cancer by data mining technique, and to explore new ideas in the diagnosis of peripheral lung cancer, and to obtain early-stage technology and knowledge support of computer-aided detecting(CAD). Methods: 58 cases of peripheral lung cancer confirmed by clinical pathology were collected. The data were imported into the database after the standardization of the clinical and CT findings attributes were identified. The data was studied comparatively based on Association Rules (AR) of the knowledge discovery process and the Rough Set (RS) reduction algorithm and Genetic Algorithm(GA) of the generic data analysis tool (ROSETTA), respectively. Results: The genetic classification algorithm of ROSETTA generates 5 000 or so diagnosis rules. The RS reduction algorithm of Johnson`s Algorithm generates 51 diagnosis rules and the AR algorithm generates 123 diagnosis rules. Three data mining methods basically consider gender, age, cough, location, lobulation sign, shape, ground-glass density attributes as the main basis for the diagnosis of peripheral lung cancer. Conclusion: These diagnosis rules for peripheral lung cancer with three data mining technology is same as clinical diagnostic rules, and these rules also can be used to build the knowledge base of expert system. This study demonstrated the potential values of data mining technology in clinical imaging diagnosis and differential diagnosis. | Yongqian Qiang Youmin Guo Xue Li Qiuping Wang Hao Chen Duwu Cui | 2007 | Journal of Nanjing Medical University2007，21，3： | 5 |
| 7 | Energy embodied in the international trade of China: An energy input–output analysis显示文摘 | Hongtao Liu Youmin Xi Ju’e Guo Xia Li | 2010 | Energy Policy2010，，8： | 2 |
| 8 | Energy embod-ied in the international trade of China : An energy input-output analysis显示文摘 | Liu Hongtao Xi Youmin Guo Jue | 2010 | Energy Policy2010，38，8： | 1 |
| 9 | Energy embodied in the international trade of China : an energy input-output a- nalysis 显示文摘 | Liu Hongtao Xi Youmin Guo Ju'e | 2010 | Energy Policy2010，38，： | 1 |
| 10 | Effect of Ba nonstoichiometry on the phase structure, sintering, electrical conductivity and phase stability of Ba 1± x Ce 0.4 Zr 0.4 Y 0.2 O 3? δ (0≤ x ≤0.20) proton conductors显示文摘 | Youmin Guo Ran Ran Zongping Shao Shaomin Liu | 2011 | International Journal of Hydrogen Energy2011，，14： | 1 |
| 11 | Comparison of four clinical scores for the predicting lower limb deep venous thrombosis in Chinese patients显示文摘Objective:To evaluate Wells,Kahn,St.Andréand Constans scores for the prediction of deep venous thrombosis in Chinese patients. Methods:One hundred and seventy-two patients,prospectively,blinded referred for evaluation with four clinical-score systems for suspected deep venous thrombosis,were examined by ultrasonography. Sensitivity,specificity,positive predictive value,nega-tive predictive value and receiver operation curves were calculated for four clinical scores. The difference between areas of the ROC curve for each of the scores was compared with others and reference line. Results:Forty-six of 172 patients had deep venous throm-bosis proven by sonography. The sensitivity,specificity,positive predictive value and negative predictive value for Wells score was 91.3%,57.1%,43.8% and 94.7%,respectively,for Kahn score; 65.2%,71.4%,45.5% and 84.9%,respectively,for St.Andréscore; 63%,38.9%,27.4% and 74.2% respectively,for Constans score; 95.7%,34.9%,34.9% and 95.7% respectively. Area under ROV curve of Constans score was 0.814,which was similar to that of Wells score,then followed by Kahn score and that of St.Andréscore was no difference with the reference line. Conclusion:Based on the results of our study,the sensitivity,negative prediction value and area under ROC curve are larger for Constans score and Wells score in Chinese hospitalized patients than that of Kahn score or St.Andréscore. Considering the aim of the clinical assessment,Constans score and Wells score are more efficient for Chinese hospitalized patients. | Li Zhu Min Liu Xiaojuan Guo Jianguo Wang Youmin Guo Chen Wang Hongxia Ma Yulin Guo | 2008 | Journal of Nanjing Medical University2008，22，4： | 1 |
| 12 | Research on consistency of identifying solitary pulmonary masses with CT显示文摘Objective:To research on consistency of identifying solitary pulmonary masses with CT. Methods:Three observers with different working backgrounds in imaging diagnosis individually interpreted the same group images of solitary pulmonary mass, by 12 indexes of objective signs. The differences in interpretation resulted in ante- and post-interpretations were assessed by the x2 test. The agreement of two interpretations from the same observer was confirmed with the kappa test. A double-blind method was adopted for analysis. Results:The agreement rates of ante- and post-interpreting from the three observers were respectively 82.65%(486/588) 80.27%(472/588) and 84.86% (499/588) while their interpreting results were generally accordant without significant difference(x2 = 4.975, df = 2, P = 0.083) however there was difference between the observer 2 and observer 3(x2 = 4.875, df = 1, P = 0.027). There were five indexes with k > 0.40 of ante- and post-interpreting results of the three observers, including clarity of nodule borderline, presence of sentus, uniformity of density, existence of cavity and calcification in pathological region, among them, the agreement rate of interpreting borderline and cavity was higher(k > 0.07); the blood vessel convergence poorer(0 < k ≤ 0.40); the other six CT signs of interpretation were slightly different. Conclusion:The ability to identify solitary pulmonary mass was inconsistent, and needs to be improved further. | Qiuping Wang Gang Niu Yun Zhang Yongqian Qiang Zicheng Li Youmin Guo | 2008 | Journal of Nanjing Medical University2008，22，4： | 1 |
| 13 | Energy embodied in the international trade of China:An energy input–output analysis显示文摘 | Liu Hongtao Xi Youmin Guo Jue’e | 2010 | Energy Policy2010，38，8： | 1 |
| 14 | Analysis of Influences between the Energy Structure Change and Energy Intensity in China显示文摘 | Guo Ju'e Chai Jian Xi Youmin | 2008 | China Polulation Resources and Environment2008，18，4： | 1 |
| 15 | Energy embodied in the international trade of China: An energy input output analysis显示文摘 | Hongtao Liu Youmin Xi Ju' e Guo Xia Li | 2010 | Energy Policy2010，，388： | 1 |
| 16 | Energy embodied in the international trade of China: An energy input-output analysis 显示文摘 | Liu Hongtao Xi Youmin Guo Ju' e Li Xia | 2010 | Energy Policy2010，38，8： | 1 |
| 17 | Analysis of Influences between the Energy Structure Change and Energy Intensity in China 显示文摘 | Guo Ju' e Chai Jian Xi Youmin | 2008 | China Population Resources and Environment2008，18，4： | 1 |
| 18 | Energy Em- bodied in the International trade of China: An Energy Input - output Analysis 显示文摘 | Hongtao Liu Youmin Xi Ju'e Guo Xia Li | 2010 | Energy Policy2010，38，： | 1 |
| 19 | Energy embodied in the intern- ational trade of China:An energy input output analysis 显示文摘 | Hongtao Liu Youmin Xi Jue Guo Xia Li | 2010 | Energy Policy2010，，388： | 1 |
| 20 | The value of CT pulmonary angiography to the diagnosis of right ventricular dysfunction due to acute pulmonary embolism:compared with ultrasonographic cardiography显示文摘Objective:To analyze the value of CT pulmonary angiography(CTPA) in assessing right ventricular dysfunction(RVD) after acute pulmonary embolism. Methods:Thirty-six patients with CTPA-confirmed PE who underwent ultrasonic cardiography(UCG) within the ensuing 24 hours were retrospectively reviewed. According to the severity of the disease,the patients were divided into the massive PE group(24 cases) and non-massive PE group(12 cases) respectively. CT scans were analyzed for findings suggestive of RVD. Scans were considered positive for RVD if the right ventricle was dilated(RVd/LVd>1) or if the interventricular septum was straightened or deviated towards the left ventricle. Results were then compared with the results of UCG to estimate the value of CTPA in detecting RVD associated with PE. Results:In all cases,compared with UCG,the diagnostic sensitivity,specificity,positive likelihood ratio,negative likelihood ratio,positive predictive value,and negative predictive value of CTPA was 84.61%,78.26%,3.892,0.197,68.75% and 90% respectively. Kappa value was 0.60,which suggested moderate agreement between CTPA and UCG in the whole level. In the massive PE group,the diagnostic sensitivity,specificity,positive likelihood ratio,negative likelihood ratio,positive predictive value,negative predictive value of CTPA was 84.61%,72.73%,3.103,0.212,78.57% and 80% respectively. Kappa value was 0.58,which suggested moderate agreement between CTPA and UCG in the massive PE group. In the non-massive PE group,the diagnostic specificity of CTPA was 83.33%. By statistics,the value of RVd/LVd had significant difference between the massive PE and the non-massive PE group. Conclusion:CTPA can reliably detect RVD through the evaluation of cardiac morphology. However,this result requires confirmation using a larger prospective cohort study. | Jianguo Wang Li Zhu Min Liu Xiaojuan Guo Chen Wang Youmin Guo Yuanhua Yang Zhenguo Zhai Hongxia Ma Yulin Guo | 2008 | Journal of Nanjing Medical University2008，22，4： | 0 |
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