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Blood Glucose control in Neonatal Intensive Care with Model-Based controllers

IFAC Proceedings Volumes 2009年第12期42卷 19-24页

作者： Aaron J. Le Compte J. Geoffrey Chase Adrienne Lynn Chris E. Hann Geoffrey M. Shaw Jessica Lin Department of Mechanical Engineering University of Canterbury Christchurch New Zealand Neonatal Department Christchurch Women's Hospital Christchurch New Zealand Department of Intensive Care Christchurch Hospital Christchurch New Zealand

Premature neonates often experience hyperglycaemia, which has been linked to increased mortality and worsened outcomes. Insulin therapy can assist in controlling blood glucose levels. However a reliable, robust control protocol is required to avoid hypoglycaemia and to meet nutrition goals. This study presents an adaptive, model-based predictive controller designed to incorporate the unique metabolic state and control parameters of the neonate. controller performance was tested in virtual trials on a 25 patient retrospective cohort and 24-hour pilot clinical trials. The effects of measurement frequency and BG sensor error were also evaluated. Time in the 4 – 7 mmol/L BG band was increased by 110%–145% compared to retrospective control for that cohort, with fewer hypoglycaemic measurements. controllers were robust to BG sensor errors.

关键词： Insulin sensitivity control algorithms physiological models simulation intensive care

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Heuristic Dynamic Programming in Wheeled Mobile Robot control

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IFAC Proceedings Volumes 2009年第13期42卷 513-518页

作者： Zenon Hendzel Marcin Szuster Department of Applied Mechanics and Robotics Rzeszów University of Technology Rzeszów Poland

Abstract In this paper a discrete algorithm for tracking control of a two-wheeled mobile robot is presented. The basis of the control algorithm is an Adaptive Critic Design in Heuristic Dynamic Programming (HDP) configuration. HDP is a model-based discrete reinforcement learning algorithm. In proposed control algorithm Actor - Critic structure is supplied by a PD controller and a supervisory element. The algorithm does not require preliminary learning, works on-line and uses a dynamics model of the mobile robot for a state prediction in Actor - Critic structure. The performance of control algorithm was tested by experiments on the mobile robot Pioneer-2DX.

关键词： control algorithms heuristic dynamic programming neural networks mobile robots tracking systems

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Foil and coil solutions

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MATERIALS WORLD 2009年第6期17卷 22-23页

作者： Osborne, Paul R. Aluminium Siemens VAI Christchurch New Zealand

There is also a foil aimed at addressing the problem of baked-on food that keeps the foil clean and permits re-use, and another that features a black coating on one side to transfer radiant heat more efficiently and improve roasting performance. Performance and production Throughout the rolling mill, in combination with the mechanical equipment, a range of automation features have been specifically developed and implemented into the Siroll ALU solution to facilitate faster operation and minimise non-productive time.

关键词： Production capacity control algorithms Changes

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Optimal drug dosing via application of the Contraction Mapping Theorem

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IFAC Proceedings Volumes 2009年第12期42卷 121-126页

作者： Neil D. Evans School of Engineering University of Warwick Coventry CV4 7AL UK

The problem of determining an oral dose, or schedule of oral doses, that gives rise to an arbitrary area-under-curve or to points on the time-series for a variable of interest in a drug kinetics model is considered. These two measures are considered as surrogates for the particular drug response to the dose. The approach taken is to formulate the problem as a fixed point one to which a version of the Contraction Mapping Theorem can be applied. The results, illustrated for a model for the anti-cancer agent topotecan, demonstrate the applicability of the approach.

关键词： Optimization problems Biomedical control Biomedical systems control applications control algorithms

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A new control algorithm for wide-sense nonblocking multiplane photonic banyan-type switching fabrics with zero crosstalk

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IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS 2008年第3期26卷 54-64页

作者： Danilewicz, Grzegorz Kabacinski, Wojciech Michalski, Marek Zal, Mariusz Poznan Univ Tech Chair Commun & Comp Networks PL-60965 Poznan Poland

A new control algorithm for log(2)(N,0,p) switching networks composed of 2 x 2 switching elements has been proposed recently. Under this algorithm log(2) (N, 0;p) switching networks with even number of stages are wide-sense nonblocking (WSNB) if p is the same as for the rearrangeable nonblocking (RNB) one. The considerred algorithm and WSNB conditions did not take into account crosstalk constraint, which is an important factor in photonic switching. This paper enhanced this algorithm to the case when crosstalk in the switching fabric is not allowed. WSNB conditions for this enhanced algorithm are also derived. It is shown, that the number of planes required is less than those derived earlier in other papers for WSNB multiplane banyan-type switching fabrics under crosstalk constraint. Under this algorithm, log(2)(N, 0, p) switching networks with odd number of stages and with zero crosstalk are WSNB if p is the same as for RNB one.

关键词： switching networks control algorithms path searching algorithms wide-sense nonblocking crosstalk

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Using fractional derivatives in joint control of hexapod robots

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JOURNAL OF VIBRATION AND control 2008年第9-10期14卷 1473-1485页

作者： Silva, Manuel F. Machado, J. A. Tenreiro Barbosa, Ramiro S. Inst Engn Porto Dept Elect Engn P-4200072 Oporto Portugal

This article studies several Fractional Order control algorithms used for joint control of a hexapod robot. Both Pade and series approximations to the fractional derivative are considered for the control algorithm. The walking performance is evaluated through two indices: The mean absolute density of energy used per unit distance travelled, and the control effort. A set of simulation experiments reveals the influence of the different approximations upon the proposed indices. The results show that the fractional proportional and derivative algorithm, implemented using the Pade approximation with a small number of terms, gives the best results.

关键词： robotics locomotion control algorithms fractional calculus performance analysis

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Using fractional derivatives in joint control of hexapod robots

Using fractional derivatives in joint control of hexapod rob...

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2nd Workshop on Fractional Differentiation and Its Applications (FDA ' 06)

作者： Silva, Manuel F. Machado, J. A. Tenreiro Barbosa, Ramiro S. Inst Engn Porto Dept Elect Engn P-4200072 Oporto Portugal

关键词： robotics locomotion control algorithms fractional calculus performance analysis

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A prototype for on-line monitoring and control of energy performance for renewable energy buildings

A prototype for on-line monitoring and control of energy per...

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5th International Conference on Informatics in control, Automation and Robotics

作者： Paris, Benjamin Eynard, Julien Francois, Gregory Talbert, Thierry Polit, Monique Univ Perpignan Lab ELIAUS F-66860 Perpignan France

ISBN: (纸本)9789898111326

In this article, ways for improving the energetic performance of buildings are investigated. A state of the art leads to the introduction of a performance indicator expressed in kWh/m(2)/yr. To improve the value of this indicator, a processor-based prototype of a real-time data-acquisition and monitoring system is developed in collaboration with two industrial companies. The set of measurements and corresponding sensors that are necessary to compute the value of the indicator while being consistent with the natural segmentation of energy consumption, is listed, thanks to the representation of the building using a systemic approach. control algorithms are tested in simulation to improve renewable energy consumption while reducing fossil energy dependence, which are deemed to be applicable in practice using the proposed electronics. Simulations concerning the control and optimization of the power applied to two warmers in a room show large potential for fossil energy consumption reduction.

关键词： renewable energies energy performance indicators monitoring system smart transducers control algorithms predictive control optimal control high efficiency buildings

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A technique for the automatic detection of insect clutter in cloud radar returns

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JOURNAL OF ATMOSPHERIC AND OCEANIC TECHNOLOGY 2008年第9期25卷 1498-1513页

作者： Luke, Edward P. Kollias, Pavlos Johnson, Karen L. Clothiaux, Eugene E. Brookhaven Natl Lab Div Atmospher Sci Upton NY 11973 USA Penn State Univ Dept Meteorol University Pk PA 16802 USA

The U.S. Department of Energy Atmospheric Radiation Measurement (ARM) Program operate, 35-GHz millimeter-wavelength Cloud radars (MMCRs) in several climatologically distinct regions. The MMCRs, which are centerpiece instruments for the observation of clouds and precipitation, provide continuous. vertically resolved information on all hydrometeors above the ARM Climate Research Facilities (ACRF). However, their ability to observe clouds in the lowest 2-3 kin of the atmosphere is often obscured by the presence of strong echoes from insects, especially during the warm months at the continental midlatitude Southern Great Plains (SGP) ACRE Here, a new automated technique for the detection and elimination of insect-contaminated echoes from the MMCR observations is presented. The technique is based on recorded MMCR Doppler spectra, a feature extractor that conditions insect spectral signatures, and the use of a neural network algorithm for the generation of an insect (clutter) mask. The technique exhibits significant skill in the identification of insect radar returns (more than 92% of insect-induced returns are identified) when the sole input to the classifier is the MMCR Doppler spectrum. The addition of circular polarization observations by the MMCR and ceilometer cloud-base measurements further improve the performance of the technique and form an even more reliable method for the removal of insect radar echoes at the ARM site. Recently, a 94-GHz Doppler polarimetric radar was installed next to the MMCR at the ACRF SGP site. Observations by both radars are used to evaluate the potential of the 94-GHz radar as being insect free and to show that dual wavelength radar reflectivity measurements can be used to identify insect radar returns.

关键词： Meteorology Clouds Velocity Precipitation Neural networks Insects Frequencies control algorithms

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On-line correction of process temperature deviations in continuous retorts

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JOURNAL OF FOOD ENGINEERING 2008年第2期84卷 258-269页

作者： Chen, Guibing Campanella, Osvaldo H. Corvalan, Carlos M. Haley, Timothy A. Purdue Univ Dept Agr & Biol Engn W Lafayette IN 47907 USA Purdue Univ Dept Food Sci W Lafayette IN 47907 USA Bush Brothers & Co Knoxville TN 37909 USA

Two algorithms. the fixed point (FP) and the worst case (WC), were developed for correcting on-line process temperature deviations in continuous retort operations through the adjustment of the product residence time, which could be performed by changing either the conveyor speed in hydrostatic retorts or the rotation speed in rotary retorts. After a process temperature deviation occurs, the FP algorithm consists in the selection of a point, for convenience close to the retort steam chamber exit, where process sterility is calculated, so that the product residence time can be changed accordingly. Alternatively, the WC algorithm consists in identifying the worst case, i.e. the more affected, container, for determining a conservative product residence time. Computer simulations showed that both algorithms provided fast estimations of the effect of process deviations on the product temperature and process lethality. This shows the potential of these algorithms for thermal processing industrial applications that may require on line control. (C) 2007 Elsevier Ltd. All rights reserved.

关键词： continuous retorts process temperature deviations on-line correction control algorithms fixed point worst case

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