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A Learning Method for Multivariable PID Control Synthesis Based on Estimated Plant Jacobian
정병묵,임윤규,Gregory D. Buckner 제어·로봇·시스템학회 2009 International Journal of Control, Automation, and Vol.7 No.5
Despite decades of research involving optimal control of multivariable systems, such controllers require accurate linear models of the plant dynamics. Real systems contain nonlinearities and high-order dynamics that may be difficult to model using conventional techniques. This paper presents a novel learning control (LC) method for PID controllers that doesn’t require explicit modeling of the plant dynamics. This method utilizes gradient descent techniques to iteratively reduce an error-related objective function. Simulations involving a hydrofoil catamaran show that the proposed PID-LC algorithm improves controller performance compared to LQR controllers derived from multivariable models.
Ritchie Delara,Jie Yang,Skye Buckner-Petty,Paul Magtibay,Kristina Butler 대한부인종양학회 2020 Journal of Gynecologic Oncology Vol.31 No.6
Objective: To evaluate the survival impact of imaging vs surgical nodal assessment inpatients with cervical cancer stage IB2–IVA prior to definitive chemoradiotherapy (CRT). Methods: PubMed, MEDLINE, Cochrane Library, and ClinicalTrials.gov were used to searchfor publications in English and Chinese over a 50-year period. The Preferred ReportingItems for Systematic Reviews and Meta-Analyses Protocols was used to conduct this review. Inclusion criteria were studies that compared survival outcomes in International Federationof Gynecology and Obstetrics 2009 stage IB2–IVA cervical cancer patients with pre-therapypelvic and/or aortic lymphadenectomy (LND) or imaging. One or more of the followingmodalities were used for nodal assessment: computed tomography (CT), magnetic resonanceimaging, or positron emission tomography-CT. The National Institutes of Health QualityAssessment Tool was utilized to assess study quality. Results: The initial search identified 65 studies, and five met the inclusion criteria. There werea total of 1,112 patients. Seven hundred and fifty-four underwent pelvic and/or aortic LND and358 had imaging. When compared to LND, imaging had a sensitivity and specificity of 88.9%and 22.2% for pelvic lymph node (LN), and 33%–62.5% and 92%–95.5% for para-aortic LN. There were no differences in progression-free survival (PFS) (hazard ratio [HR]=1.13; 95%confidence interval [CI]=0.73–1.74; I2=75%; p<0.01) and overall survival (OS) (HR=1.06; 95%CI=0.66–1.69; I2=75%; p<0.01) between surgical and imaging nodal assessment. Conclusions: Imaging and surgical nodal assessment has comparable PFS and OS in patientswith cervical cancer stage IB2–IVA. Trial Registration: PROSPERO Identifier: CRD42020155486
Extended H<sub>2</sub> emission line sources from UWISH2
Froebrich, D.,Makin, S. V.,Davis, C. J.,Gledhill, T. M.,Kim, Y.,Koo, B.-C.,Rowles, J.,Eislö,ffel, J.,Nicholas, J.,Lee, J. J.,Williamson, J.,Buckner, A. S. M. Oxford University Press 2015 Monthly notices of the Royal Astronomical Society Vol.454 No.3