A new design scheme of decentralized model reference adaptive sliding mode controller for a class of MIMO nonlinear systems with the high-order interconnections is propcsed. The design is based on the universal approx...A new design scheme of decentralized model reference adaptive sliding mode controller for a class of MIMO nonlinear systems with the high-order interconnections is propcsed. The design is based on the universal approximation capability of the Takagi - Seguno （T-S） fuzzy systems. Motivated by the principle of certainty equivalenteontrol, a decentralized adaptive controller is designed to achieve the tracking objective without computafion of the T-S fuzz ymodel. The approach does not require the upper bound of the uncertainty term to be known through some adaptive estimation. By theoretical analysis, the closed-loop fuzzy control system is proven to be globally stable in the sense that all signalsinvolved are bounded, with tracking errors converging to zero. Simulation results demonstrate the effectiveness of the approach.展开更多
This paper is devoted to study the application of the decentralized sliding mode control method, which is used to reduce the vibration of large spacecraft flexible appendage. In the process of control design, the slid...This paper is devoted to study the application of the decentralized sliding mode control method, which is used to reduce the vibration of large spacecraft flexible appendage. In the process of control design, the sliding surface of sliding mode control is determined by minimizing the optimal cost function, and the controller is the saturation controller. The controlled structure is subject to arbitrary, unmeasurable and uncertainty disturbance forces and initial displacement. The decentralized control method and the centralized control method are used to control vibration of the structure respectively. When the system is subjected to the initial displacement or external disturbance, the computer simulation shows that both of these control methods perform effectively, but the number of Riccati equation of the decentralized method is far smaller than that of centralized control method, especially in a large system.展开更多
A new decentralized robust control method is discussed for a class of nonlinear interconnected largescale system with unknown bounded disturbance and unknown nonlinear function term. A decentralized control law is pro...A new decentralized robust control method is discussed for a class of nonlinear interconnected largescale system with unknown bounded disturbance and unknown nonlinear function term. A decentralized control law is proposed which combines the approximation method of neural network with sliding mode control. The decentralized controller consists of an equivalent controller and an adaptive sliding mode controller. The sliding mode controller is a robust controller used to reduce the track error of the control system. The neural networks are used to approximate the unknown nonlinear functions, meanwhile the approximation errors of the neural networks are applied to the weight value updated law to improve performance of the system. Finally, an example demonstrates the availability of the decentralized control method.展开更多
It is not objective to rate the decision-making factors in the traditional failure mode and effect analysis,so fuzzy semantic theory is used in this paper.Six fuzzy semantic scales and their corresponding semantics ar...It is not objective to rate the decision-making factors in the traditional failure mode and effect analysis,so fuzzy semantic theory is used in this paper.Six fuzzy semantic scales and their corresponding semantics are summarized,and a defuzzification method is studied to obtain the fuzzy value table of the six fuzzy semantic scales.For the conflicts between experts in the traditional failure mode and effects analysis,a conflict-resolution algorithm is studied to obtain the failure risk order.Finally,a certain type of industrial valve is used as an example to prove the validity of the theory proposed in this paper.展开更多
The problem of direct adaptive neural network control for a class of large-scale systems with unknown function control gains and the high-order interconneetions is studied in this paper. Based on the principle of slid...The problem of direct adaptive neural network control for a class of large-scale systems with unknown function control gains and the high-order interconneetions is studied in this paper. Based on the principle of sliding mode control and the approximation capability of multilayer neural networks, a design scheme of decentralized di- rect adaptive sliding mode controller is proposed. The plant dynamic uncertainty and modeling errors are adaptively compensated by adjusted the weights and sliding mode gains on-line for each subsystem using only local informa- tion. According to the Lyapunov method, the closed-loop adaptive control system is proven to be globally stable, with tracking errors converging to a neighborhood of zero. Simulation results demonstrate the effectiveness of the proposed approach.展开更多
This paper, at the first time, considers the problem of decentralized variable structure control of complex giant singular uncertainty systems by using the property of diagonally dominant matrix and Frobenius-Person t...This paper, at the first time, considers the problem of decentralized variable structure control of complex giant singular uncertainty systems by using the property of diagonally dominant matrix and Frobenius-Person theorem. The splendid selection of switching manifold for each subsystem makes the design relatively straightforward and can be easily realized. An illustrate example is given.展开更多
Key technologies as well as their principles were discussed for a decentralized control platform capable of dynamic evolution. The primary content includes the automatic decision-making mechanism and the algorithm of ...Key technologies as well as their principles were discussed for a decentralized control platform capable of dynamic evolution. The primary content includes the automatic decision-making mechanism and the algorithm of the control center migration, the principle and technology of system self-monitoring, the principle and technology of the switch-mode of remote control station, the information transmission technology, and the data consistency technology. These key technologies have shown a series of advanced characteristics for decentralized control platform.展开更多
Objective: Women’s preferences for the mode of delivery provide clues on their knowledge and perceptions of anticipated risk of childbirth complications.?The objective was toinvestigate?incongruence between preferred...Objective: Women’s preferences for the mode of delivery provide clues on their knowledge and perceptions of anticipated risk of childbirth complications.?The objective was toinvestigate?incongruence between preferred mode of delivery and risk of adverse pregnancy outcomes. Methods: Through a cross-sectional study, data were?collected from 327?women admitted to Mulago hospital. Data included socio-demographic?characteristics, past medical, gynaecological and obstetric history, pregnancy complications, knowledge of pregnancy complications and preferred mode of delivery. The preferred mode of delivery and knowledge of related risks for adverse pregnancy outcomes were compared. Results: The mean age of participants was 24.7 years (±5.9), ranging?14?-?43 years, of whom 41.4% were nulliparous. The preferred mode of delivery was vaginal (84.1%). Incongruence?(preference for a mode of delivery that did not correspond to expected or anticipated risks) occurred in 88 (26.9%) of the women, and was associated with having secondary school or higher level of education (OR 2.49, CI 1.52?-?4.08) and history of previous vaginal delivery (OR 3.82,?CI 1.94?-?7.49). Conclusion: One in four women had incongruence between preferred mode of delivery and risks of adverse pregnancy outcomes, which called?for urgent interventions to improve decision-making about intrapartum care.展开更多
In China,there are three basic clinical decision-making modes for patients,namely patients autonomous decision-making mode,family decision-making mode and patient and family codetermination.They were produced under th...In China,there are three basic clinical decision-making modes for patients,namely patients autonomous decision-making mode,family decision-making mode and patient and family codetermination.They were produced under the unique background of Chinese medicine,Confucian philosophy and law in China,l this paper,the concepts,advantages and disadvantages of these three decision-making modes were analyzed In addition,some suggestions were put forward for the improvement.The first is that we suggest to establis standards for choosing decision-making modes;the second is to further learn and publicize relevant laws;thirdly the legal system needs to be further refined;and the last one is to carry out ethical ward round.展开更多
文摘A new design scheme of decentralized model reference adaptive sliding mode controller for a class of MIMO nonlinear systems with the high-order interconnections is propcsed. The design is based on the universal approximation capability of the Takagi - Seguno （T-S） fuzzy systems. Motivated by the principle of certainty equivalenteontrol, a decentralized adaptive controller is designed to achieve the tracking objective without computafion of the T-S fuzz ymodel. The approach does not require the upper bound of the uncertainty term to be known through some adaptive estimation. By theoretical analysis, the closed-loop fuzzy control system is proven to be globally stable in the sense that all signalsinvolved are bounded, with tracking errors converging to zero. Simulation results demonstrate the effectiveness of the approach.
文摘This paper is devoted to study the application of the decentralized sliding mode control method, which is used to reduce the vibration of large spacecraft flexible appendage. In the process of control design, the sliding surface of sliding mode control is determined by minimizing the optimal cost function, and the controller is the saturation controller. The controlled structure is subject to arbitrary, unmeasurable and uncertainty disturbance forces and initial displacement. The decentralized control method and the centralized control method are used to control vibration of the structure respectively. When the system is subjected to the initial displacement or external disturbance, the computer simulation shows that both of these control methods perform effectively, but the number of Riccati equation of the decentralized method is far smaller than that of centralized control method, especially in a large system.
文摘A new decentralized robust control method is discussed for a class of nonlinear interconnected largescale system with unknown bounded disturbance and unknown nonlinear function term. A decentralized control law is proposed which combines the approximation method of neural network with sliding mode control. The decentralized controller consists of an equivalent controller and an adaptive sliding mode controller. The sliding mode controller is a robust controller used to reduce the track error of the control system. The neural networks are used to approximate the unknown nonlinear functions, meanwhile the approximation errors of the neural networks are applied to the weight value updated law to improve performance of the system. Finally, an example demonstrates the availability of the decentralized control method.
基金National Natural Science Foundation of China(No.51565019)the Scientific Research Start-Up Program of Tongji University,China(No.20141110)
文摘It is not objective to rate the decision-making factors in the traditional failure mode and effect analysis,so fuzzy semantic theory is used in this paper.Six fuzzy semantic scales and their corresponding semantics are summarized,and a defuzzification method is studied to obtain the fuzzy value table of the six fuzzy semantic scales.For the conflicts between experts in the traditional failure mode and effects analysis,a conflict-resolution algorithm is studied to obtain the failure risk order.Finally,a certain type of industrial valve is used as an example to prove the validity of the theory proposed in this paper.
基金This project was supported by the National Natural Science Foundation (60074013 &10371106)the Natural ScienceFoundation of Education Bureau of Jiangsu (KK0310067) the Foundation of Information Science Subject Group of YangzhouUniversity (ISG030606)
文摘The problem of direct adaptive neural network control for a class of large-scale systems with unknown function control gains and the high-order interconneetions is studied in this paper. Based on the principle of sliding mode control and the approximation capability of multilayer neural networks, a design scheme of decentralized di- rect adaptive sliding mode controller is proposed. The plant dynamic uncertainty and modeling errors are adaptively compensated by adjusted the weights and sliding mode gains on-line for each subsystem using only local informa- tion. According to the Lyapunov method, the closed-loop adaptive control system is proven to be globally stable, with tracking errors converging to a neighborhood of zero. Simulation results demonstrate the effectiveness of the proposed approach.
文摘This paper, at the first time, considers the problem of decentralized variable structure control of complex giant singular uncertainty systems by using the property of diagonally dominant matrix and Frobenius-Person theorem. The splendid selection of switching manifold for each subsystem makes the design relatively straightforward and can be easily realized. An illustrate example is given.
基金The National Innovation Fund ( No.00C262251211336)
文摘Key technologies as well as their principles were discussed for a decentralized control platform capable of dynamic evolution. The primary content includes the automatic decision-making mechanism and the algorithm of the control center migration, the principle and technology of system self-monitoring, the principle and technology of the switch-mode of remote control station, the information transmission technology, and the data consistency technology. These key technologies have shown a series of advanced characteristics for decentralized control platform.
文摘Objective: Women’s preferences for the mode of delivery provide clues on their knowledge and perceptions of anticipated risk of childbirth complications.?The objective was toinvestigate?incongruence between preferred mode of delivery and risk of adverse pregnancy outcomes. Methods: Through a cross-sectional study, data were?collected from 327?women admitted to Mulago hospital. Data included socio-demographic?characteristics, past medical, gynaecological and obstetric history, pregnancy complications, knowledge of pregnancy complications and preferred mode of delivery. The preferred mode of delivery and knowledge of related risks for adverse pregnancy outcomes were compared. Results: The mean age of participants was 24.7 years (±5.9), ranging?14?-?43 years, of whom 41.4% were nulliparous. The preferred mode of delivery was vaginal (84.1%). Incongruence?(preference for a mode of delivery that did not correspond to expected or anticipated risks) occurred in 88 (26.9%) of the women, and was associated with having secondary school or higher level of education (OR 2.49, CI 1.52?-?4.08) and history of previous vaginal delivery (OR 3.82,?CI 1.94?-?7.49). Conclusion: One in four women had incongruence between preferred mode of delivery and risks of adverse pregnancy outcomes, which called?for urgent interventions to improve decision-making about intrapartum care.
文摘In China,there are three basic clinical decision-making modes for patients,namely patients autonomous decision-making mode,family decision-making mode and patient and family codetermination.They were produced under the unique background of Chinese medicine,Confucian philosophy and law in China,l this paper,the concepts,advantages and disadvantages of these three decision-making modes were analyzed In addition,some suggestions were put forward for the improvement.The first is that we suggest to establis standards for choosing decision-making modes;the second is to further learn and publicize relevant laws;thirdly the legal system needs to be further refined;and the last one is to carry out ethical ward round.
