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Selected AbstractsAdaptive estimation and rejection of unknown sinusoidal disturbances through measurement feedback for a class of non-minimum phase non-linear MIMO systemsINTERNATIONAL JOURNAL OF ADAPTIVE CONTROL AND SIGNAL PROCESSING, Issue 2 2006Weiyao Lan Abstract This paper develops an adaptive estimation method to estimate unknown disturbances in a class of non-minimum phase non-linear MIMO systems. The unknown disturbances are generated by an unknown linear exosystem. The frequencies, phases and amplitudes of the disturbances are unknown, the only available information of the disturbances is the number of distinctive frequencies. The system considered in this paper is a class of MIMO non-linear systems in the output feedback form which can be non-minimum phase. The proposed estimation algorithm provides exponentially convergent estimates of system states, unknown disturbances in the system and frequencies of the disturbances characterized by the eigenvalues of the exosystem. Moreover, based on the stabilization controller for the disturbance free system, the estimates of the disturbances are used to solve the disturbance rejection problem. The unknown disturbances are compensated completely with the stability of the whole closed-loop system. Copyright © 2006 John Wiley & Sons, Ltd. [source] Observer-based adaptive robust control of a class of nonlinear systems with dynamic uncertainties,INTERNATIONAL JOURNAL OF ROBUST AND NONLINEAR CONTROL, Issue 4 2001Bin Yao Abstract In this paper, a discontinuous projection-based adaptive robust control (ARC) scheme is constructed for a class of nonlinear systems in an extended semi-strict feedback form by incorporating a nonlinear observer and a dynamic normalization signal. The form allows for parametric uncertainties, uncertain nonlinearities, and dynamic uncertainties. The unmeasured states associated with the dynamic uncertainties are assumed to enter the system equations in an affine fashion. A novel nonlinear observer is first constructed to estimate the unmeasured states for a less conservative design. Estimation errors of dynamic uncertainties, as well as other model uncertainties, are dealt with effectively via certain robust feedback control terms for a guaranteed robust performance. In contrast with existing conservative robust adaptive control schemes, the proposed ARC method makes full use of the available structural information on the unmeasured state dynamics and the prior knowledge on the bounds of parameter variations for high performance. The resulting ARC controller achieves a prescribed output tracking transient performance and final tracking accuracy in the sense that the upper bound on the absolute value of the output tracking error over entire time-history is given and related to certain controller design parameters in a known form. Furthermore, in the absence of uncertain nonlinearities, asymptotic output tracking is also achieved. Copyright © 2001 John Wiley & Sons, Ltd. [source] Preparing to sit the Royal Australia and New Zealand College of Radiologists Faculty of Radiation Oncology Fellowship Part 2 examination: The value of a workshop including practice and feedbackJOURNAL OF MEDICAL IMAGING AND RADIATION ONCOLOGY, Issue 5 2007S Bydder Summary A workshop has been held annually to help prepare candidates to sit the Royal Australia and New Zealand College of Radiologists Part 2 Faculty of Radiation Oncology examination. This study examined the value of such a course and its component parts and assessed attendees' learning environments. We collected detailed information from participants before and after the training workshop in 2005. A specific feature of this workshop included the use of an examination technique feedback form to facilitate the provision of systematic and comprehensive feedback to individual candidates after mock examination. Participants completed course evaluation forms and a learning environment survey. There were 22 candidate participants. The course and its components of this course were perceived very positively , including the examination technique feedback forms and written advice. Only three of the 24 questions regarding the registrars learning environment had less than 80% favourable responses , two of these questions related to workload. The course design described seems reasonably satisfactory in that it included the components ranked most highly by candidates. We also identified a number of variations that may be useful for future workshops. Although learning environments were generally good, we identified a perceived problem with workloads affecting a significant number of registrars. [source] Seeking transparency, international arbitration users propose to gather feedbackALTERNATIVES TO THE HIGH COST OF LITIGATION, Issue 11 2007Russ Bleemer A group of international attorneys decide to do something about the arbitrator selection issues they had been chatting about on a list serv. The result is a new arbitrator feedback form, and a proposal to collect information for a subscription database. Also, details on a new international pledge under which attorneys will put ADR forward as a first option [source] Type 2 Diabetes: Fueling the Surge of Cardiovascular Disease in WomenNURSING FOR WOMENS HEALTH, Issue 6 2008Emily J. Jones BSN Objectives Upon completion of this activity, the learner will be able to: 1Recognize and identify the interrelated risk factors that contribute to the development of type 2 diabetes and cardiovascular disease (CVD) in women. 2Formulate strategies that result in the early identification of women at risk for developing type 2 diabetes and CVD. 3Describe intervention strategies for the prevention and treatment of type 2 diabetes and CVD in women. Continuing Nursing Education (CNE) Credit A total of 2 contact hours may be earned as CNE credit for reading "Type 2 Diabetes: Fueling the Surge of Cardiovascular Disease in Women" and for completing an online post-test and participant feedback form. To take the test and complete the participant feedback form, please visit http://JournalsCNE.awhonn.org. Certificates of completion will be issued on receipt of the completed participant feedback form and processing fees. AWHONN is accredited as a provider of continuing nursing education by the American Credentialing Center's Commission on Accreditation. Accredited status does not imply endorsement by AWHONN or ANCC of any commercial products displayed or discussed in conjunction with an educational activity. AWHONN also holds California and Alabama BRN numbers: California CNE provider #CEP580 and Alabama #ABNP0058. [source] The optimal feedback control of the linear-quadratic control problem with a control inequality constraintOPTIMAL CONTROL APPLICATIONS AND METHODS, Issue 2 2001Yunying Mao Abstract In this paper, we consider the linear-quadratic control problem with an inequality constraint on the control variable. We derive the feedback form of the optimal control by the agency of the unconstrained linear-quadratic control systems. Copyright © 2001 John Wiley & Sons, Ltd. [source] ADAPTIVE SLIDING MODE BACKSTEPPING CONTROL OF NONLINEAR SYSTEMS WITH UNMATCHED UNCERTAINTYASIAN JOURNAL OF CONTROL, Issue 4 2004Ali J. Koshkouei ABSTRACT This paper considers an adaptive backstepping algorithm for designing the control for a class of nonlinear continuous uncertain processes with disturbances that can be converted to a parametric semi-strict feedback form. Sliding mode control using a combined adaptive backstepping sliding mode control (SMC) algorithm, is also studied. The algorithm follows a systematic procedure for the design of adaptive control laws for the output tracking of nonlinear systems with matched and unmatched uncertainty. [source] Dynamic Optimization in Chemical Processes Using Region Reduction Strategy and Control Vector Parameterization with an Ant Colony Optimization AlgorithmCHEMICAL ENGINEERING & TECHNOLOGY (CET), Issue 4 2008A. Asgari Abstract Two different approaches of the dynamic optimization for chemical process control engineering applications are presented. The first approach is based on discretizing both the control region and the time interval. This method, known as the Region Reduction Strategy (RRS), employs the previous solution in its next iteration to obtain more accurate results. Moreover, the procedure will continue unless the control region becomes smaller than a prescribed value. The second approach is called Control Vector Parameterization (CVP) and appears to have a large number of advantages. In this approach, control action is generated in feedback form, i.e., a set of trial functions of the state variables are expanded by multiplying by some unknown coefficients. By utilizing an optimization method, these coefficients are calculated. The Ant Colony Optimization (ACO) algorithm is employed as an optimization method in both approaches. [source] Preparing to sit the Royal Australia and New Zealand College of Radiologists Faculty of Radiation Oncology Fellowship Part 2 examination: The value of a workshop including practice and feedbackJOURNAL OF MEDICAL IMAGING AND RADIATION ONCOLOGY, Issue 5 2007S Bydder Summary A workshop has been held annually to help prepare candidates to sit the Royal Australia and New Zealand College of Radiologists Part 2 Faculty of Radiation Oncology examination. This study examined the value of such a course and its component parts and assessed attendees' learning environments. We collected detailed information from participants before and after the training workshop in 2005. A specific feature of this workshop included the use of an examination technique feedback form to facilitate the provision of systematic and comprehensive feedback to individual candidates after mock examination. Participants completed course evaluation forms and a learning environment survey. There were 22 candidate participants. The course and its components of this course were perceived very positively , including the examination technique feedback forms and written advice. Only three of the 24 questions regarding the registrars learning environment had less than 80% favourable responses , two of these questions related to workload. The course design described seems reasonably satisfactory in that it included the components ranked most highly by candidates. We also identified a number of variations that may be useful for future workshops. Although learning environments were generally good, we identified a perceived problem with workloads affecting a significant number of registrars. [source] | |||||||||||||