An analytical tuning method was proposed for fuzzy PID controller used in Smith predictor in order to extend its application and improve its robustness. The fuzzy PID controller was expressed as a sliding mode control...An analytical tuning method was proposed for fuzzy PID controller used in Smith predictor in order to extend its application and improve its robustness. The fuzzy PID controller was expressed as a sliding mode control. Based on Lyapunov theory, Smith predictor was analyzed in time domain. The parameters of the fuzzy PID controller can be obtained using traditional linear control theory and sliding mode control theory. The simulation experiments were implemented. The simulation results show that the control performance, robustness and stability of the fuzzy PID controller are better than those of the PID controller in Smith predictor.展开更多
A robust tuning method for ο^Astroem＇s two-degree of Freedom Modified Smith Predictor （MSP） is proposed, and it can achieve the fast setpoint and load disturbance responses independently. The tuning rules may meet...A robust tuning method for ο^Astroem＇s two-degree of Freedom Modified Smith Predictor （MSP） is proposed, and it can achieve the fast setpoint and load disturbance responses independently. The tuning rules may meet the requirements within a certain delay margin according to the robustness theory. The simulation results illustrate that the tuning method is efficient compared with other controllers. Finally, the MSP controller is applied to the 15L batch fermentation system for controlling the temperature in bioreactor, and the experiment results further verify that the robust tuning rules may achieve good performance.展开更多
Active set method and gradient projection method are curre nt ly the main approaches for linearly constrained convex programming. Interior-po int method is one of the most effective choices for linear programming. In ...Active set method and gradient projection method are curre nt ly the main approaches for linearly constrained convex programming. Interior-po int method is one of the most effective choices for linear programming. In the p aper a predictor-corrector interior-point algorithm for linearly constrained c onvex programming under the predictor-corrector motivation was proposed. In eac h iteration, the algorithm first performs a predictor-step to reduce the dualit y gap and then a corrector-step to keep the points close to the central traject ory. Computations in the algorithm only require that the initial iterate be nonn egative while feasibility or strict feasibility is not required. It is proved th at the algorithm is equivalent to a level-1 perturbed composite Newton method. Numerical experiments on twenty-six standard test problems are made. The result s show that the proposed algorithm is stable and robust.展开更多
Direct dynamics simulations are a useful and general approach for studying the atomistic properties of complex chemical systems because they do not require fitting an analytic potential energy function.Hessian-based p...Direct dynamics simulations are a useful and general approach for studying the atomistic properties of complex chemical systems because they do not require fitting an analytic potential energy function.Hessian-based predictor-corrector integrators are a widely used approach for calculating the trajectories of moving atoms in direct dynamics simulations.We employ a monodromy matrix to propose a tool for evaluating the accuracy of integrators in the trajectory calculation.We choose a general velocity Verlet as a different object.We also simulate molecular with hydrogen(CO_2) and molecular with hydrogen(H_2O) motions.Comparing the eigenvalues of monodromy matrix,many simulations show that Hessian-based predictor-corrector integrators perform well for Hessian updates and non-Hessian updates.Hessian-based predictor-corrector integrator with Hessian update has a strong performance in the H_2O simulations.Hessian-based predictor-corrector integrator with Hessian update has a strong performance when the integrating step of the velocity Verlet approach is tripled for the predicting step.In the CO_2 simulations,a strong performance occurs when the integrating step is a multiple of five.展开更多
It has been shown in various papers that most interior-point algorithms for linear optimization and their analysis can be generalized to P_＊（κ） linear complementarity problems.This paper presents an extension of t...It has been shown in various papers that most interior-point algorithms for linear optimization and their analysis can be generalized to P_＊（κ） linear complementarity problems.This paper presents an extension of the recent variant of Mehrotra＇s second order algorithm for linear optimijation.It is shown that the iteration-complexity bound of the algorithm is O（4κ ＋ 3）√14κ ＋ 5 nlog（x0）Ts0/ε,which is similar to that of the corresponding algorithm for linear optimization.展开更多
Objective:Patients with cerebrospinal fluid(CSF)pleocytosis are routinely admitted to the hospital and treated with parenteral antibiotics,although few have bacterial meningitis(BM).The aim of this study was to evalua...Objective:Patients with cerebrospinal fluid(CSF)pleocytosis are routinely admitted to the hospital and treated with parenteral antibiotics,although few have bacterial meningitis(BM).The aim of this study was to evaluate predictors to differentiate BM from aseptic meningitis(ASM).Methods:The study was conducted in Razi hospital,a training center affiliated to Ahvaz Joundishapoor University of Medical Sciences in Iran.and all patients were 18 years old or above and were treated in the hospital between 2003 and 2007.Data of those who had meningitis,tested as CSF pleocytosis but had not received antibiotic treatment before lumbar puncture were retrospectively analyzed.Results:Among 312 patients with CSF pleocytosis,two hundred fifteen(68.9%)had BM and ninety seven(31.1%)had ASM.The mean age for patients with BM was(34.7±17.7)years(P=0.22,NS).Sixty percent of the BM cases and 61.2% of the ASM cases occurred in men(P=0.70,NS).We identified the following predictors of BM:CSF-WBC count>100 per micro liter,CSF-glucose level<40 mg/dL,CSF-protein level>80 mg/dL.Sensitivity,specificity,PPV,NPV of these predictors,and LR for BM are 86.5%,52.6%,80.2%,63.7% and 104.1 for CSF-WBC count and 72.1%,83.5%,90.6%,57.4% and 164.2% for CSF glucose,and 49.7%,91.8%,93.4%,45.2% and 104.5% for CSF protein.Conclusion:The CSF WBC count should not be used alone to rule out bacterial meningitis.When it is combined with other factors such as CSF glucose and protein improved decision making in patients with suspected BM may occur.展开更多
吉林大学计算机科学与技术学院2022级博士研究生杨雨欣为第一作者的论文“Ensemble Conformal Predictor (En CP):A New Conformal Predictor with Robustness Guarantees Against Data Poisoning Attacks”被IEEE Symposium on Securit...吉林大学计算机科学与技术学院2022级博士研究生杨雨欣为第一作者的论文“Ensemble Conformal Predictor (En CP):A New Conformal Predictor with Robustness Guarantees Against Data Poisoning Attacks”被IEEE Symposium on Security and Privacy (IEEE S&P 2026)接收。作者还包括杨雨欣的指导教师教授李强、吉林大学人工智能学院博士研究生封润洋,共同通信作者是美国丰田工业大学芝加哥分校教授Liren Shan和美国伊利诺伊理工大学教授Binghui Wang。展开更多
基金Project(70473068) supported by the National Natural Science Foundation of ChinaProject(05JZD00024) supported by the Major Subject of Ministry of Education, China
文摘An analytical tuning method was proposed for fuzzy PID controller used in Smith predictor in order to extend its application and improve its robustness. The fuzzy PID controller was expressed as a sliding mode control. Based on Lyapunov theory, Smith predictor was analyzed in time domain. The parameters of the fuzzy PID controller can be obtained using traditional linear control theory and sliding mode control theory. The simulation experiments were implemented. The simulation results show that the control performance, robustness and stability of the fuzzy PID controller are better than those of the PID controller in Smith predictor.
基金This project was supported by the National Science Foundation for Distinguished Young Scholars (60625302)National "973" Basic Research Program of China (2002CB312200)+1 种基金National "863" High Technology Development Program (20060104Z1081) Major State Basic Research Development Program of Shanghai (05DJ14002).
文摘A robust tuning method for ο^Astroem＇s two-degree of Freedom Modified Smith Predictor （MSP） is proposed, and it can achieve the fast setpoint and load disturbance responses independently. The tuning rules may meet the requirements within a certain delay margin according to the robustness theory. The simulation results illustrate that the tuning method is efficient compared with other controllers. Finally, the MSP controller is applied to the 15L batch fermentation system for controlling the temperature in bioreactor, and the experiment results further verify that the robust tuning rules may achieve good performance.
文摘Active set method and gradient projection method are curre nt ly the main approaches for linearly constrained convex programming. Interior-po int method is one of the most effective choices for linear programming. In the p aper a predictor-corrector interior-point algorithm for linearly constrained c onvex programming under the predictor-corrector motivation was proposed. In eac h iteration, the algorithm first performs a predictor-step to reduce the dualit y gap and then a corrector-step to keep the points close to the central traject ory. Computations in the algorithm only require that the initial iterate be nonn egative while feasibility or strict feasibility is not required. It is proved th at the algorithm is equivalent to a level-1 perturbed composite Newton method. Numerical experiments on twenty-six standard test problems are made. The result s show that the proposed algorithm is stable and robust.
基金Project(2016JJ2029)supported by Hunan Provincial Natural Science Foundation of ChinaProject(2016WLZC014)supported by the Open Research Fund of Hunan Provincial Key Laboratory of Network Investigational TechnologyProject(2015HNWLFZ059)supported by the Open Research Fund of Key Laboratory of Network Crime Investigation of Hunan Provincial Colleges,China
文摘Direct dynamics simulations are a useful and general approach for studying the atomistic properties of complex chemical systems because they do not require fitting an analytic potential energy function.Hessian-based predictor-corrector integrators are a widely used approach for calculating the trajectories of moving atoms in direct dynamics simulations.We employ a monodromy matrix to propose a tool for evaluating the accuracy of integrators in the trajectory calculation.We choose a general velocity Verlet as a different object.We also simulate molecular with hydrogen(CO_2) and molecular with hydrogen(H_2O) motions.Comparing the eigenvalues of monodromy matrix,many simulations show that Hessian-based predictor-corrector integrators perform well for Hessian updates and non-Hessian updates.Hessian-based predictor-corrector integrator with Hessian update has a strong performance in the H_2O simulations.Hessian-based predictor-corrector integrator with Hessian update has a strong performance when the integrating step of the velocity Verlet approach is tripled for the predicting step.In the CO_2 simulations,a strong performance occurs when the integrating step is a multiple of five.
基金supported by the Natural Science Foundation of Hubei Province of China(2008CDZ047)
文摘It has been shown in various papers that most interior-point algorithms for linear optimization and their analysis can be generalized to P_＊（κ） linear complementarity problems.This paper presents an extension of the recent variant of Mehrotra＇s second order algorithm for linear optimijation.It is shown that the iteration-complexity bound of the algorithm is O（4κ ＋ 3）√14κ ＋ 5 nlog（x0）Ts0/ε,which is similar to that of the corresponding algorithm for linear optimization.
文摘Objective:Patients with cerebrospinal fluid(CSF)pleocytosis are routinely admitted to the hospital and treated with parenteral antibiotics,although few have bacterial meningitis(BM).The aim of this study was to evaluate predictors to differentiate BM from aseptic meningitis(ASM).Methods:The study was conducted in Razi hospital,a training center affiliated to Ahvaz Joundishapoor University of Medical Sciences in Iran.and all patients were 18 years old or above and were treated in the hospital between 2003 and 2007.Data of those who had meningitis,tested as CSF pleocytosis but had not received antibiotic treatment before lumbar puncture were retrospectively analyzed.Results:Among 312 patients with CSF pleocytosis,two hundred fifteen(68.9%)had BM and ninety seven(31.1%)had ASM.The mean age for patients with BM was(34.7±17.7)years(P=0.22,NS).Sixty percent of the BM cases and 61.2% of the ASM cases occurred in men(P=0.70,NS).We identified the following predictors of BM:CSF-WBC count>100 per micro liter,CSF-glucose level<40 mg/dL,CSF-protein level>80 mg/dL.Sensitivity,specificity,PPV,NPV of these predictors,and LR for BM are 86.5%,52.6%,80.2%,63.7% and 104.1 for CSF-WBC count and 72.1%,83.5%,90.6%,57.4% and 164.2% for CSF glucose,and 49.7%,91.8%,93.4%,45.2% and 104.5% for CSF protein.Conclusion:The CSF WBC count should not be used alone to rule out bacterial meningitis.When it is combined with other factors such as CSF glucose and protein improved decision making in patients with suspected BM may occur.
文摘吉林大学计算机科学与技术学院2022级博士研究生杨雨欣为第一作者的论文“Ensemble Conformal Predictor (En CP):A New Conformal Predictor with Robustness Guarantees Against Data Poisoning Attacks”被IEEE Symposium on Security and Privacy (IEEE S&P 2026)接收。作者还包括杨雨欣的指导教师教授李强、吉林大学人工智能学院博士研究生封润洋,共同通信作者是美国丰田工业大学芝加哥分校教授Liren Shan和美国伊利诺伊理工大学教授Binghui Wang。
