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You searched for subject:(multi model ensembles). Showing records 1 – 3 of 3 total matches.

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University of Lund

1. Foster, Kean. Hydrological Seasonal Forecasting.

Degree: 2019, University of Lund

In Sweden, almost half of the electricity produced comes from hydropower. However, the amount of water in the reservoir catchments is not evenly distributed throughout the year. During the colder months, precipitation usually falls as snow and accumulates into a snowpack. This frozen water is not available to the energy producers until the spring snow melt when as much as 70% of the annual discharge will be generated. This can create a situation where there is a shortage of water resources during the winter when demand and energy prices are high, and a surplus during the spring and summer when demand and prices are lower. Hydropower plant operators try to minimize this asymmetric distribution through regulation of reservoir storages and hydrological forecasts are crucial for this.However, the predominant method for hydrological seasonal forecasting of the spring flood period in Scandinavia is the Ensemble Streamflow Prediction (ESP) approach. ESP uses historical observations of precipitation and temperature from previous years (a so-called historical ensemble) to force the hydrological model. The problem is that these forecasts are climatological in character, i.e. it performs well when the weather during the forecast period evolves normally, however if the development of weather conditions is not "normal", the season forecast will be more or less wrong.The thesis of this work is that it is possible to improve seasonal forecasts so that they still have skill even when the weather deviates from the normal climate during the forecast period. By better understanding what affects the variability in the hydrology and using that information to inform how to modifying or replace the ESP forecasting approach, it is possible to real skilful improvements over the ESP.In this work it is shown that the variability in selected teleconnection patterns are the leading source of variability in the seasonal discharge. In the case of the spring flood period in northern Sweden, these are the North Atlantic Oscillation, Arctic Oscillation, and Scandinavian pattern. With the help of information garnered by investigating these connections it is possible to modify different forecast modelling chains, that on their own show limited (if any) skill over ESP, and combine them into a multi-chain forecast system that does show skill over the ESP. A multi-model made up of three different individual modelling chains, using a simple weighting scheme to combine them, is able to improve the general skill of spring flood volume forecasts and improve their ability to predict non-normal events

Subjects/Keywords: Teknik och teknologier; hydrological seasonal forecasting; seasonal forecast; spring flood; multi-model ensembles; teleconnection patterns; modelling chain

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Foster, K. (2019). Hydrological Seasonal Forecasting. (Doctoral Dissertation). University of Lund. Retrieved from http://lup.lub.lu.se/record/bf1784c2-8d69-4f7a-8963-30fb26b59a25 ; http://portal.research.lu.se/ws/files/69071987/e_spikex_kean_nr2.pdf

Chicago Manual of Style (16th Edition):

Foster, Kean. “Hydrological Seasonal Forecasting.” 2019. Doctoral Dissertation, University of Lund. Accessed September 19, 2019. http://lup.lub.lu.se/record/bf1784c2-8d69-4f7a-8963-30fb26b59a25 ; http://portal.research.lu.se/ws/files/69071987/e_spikex_kean_nr2.pdf.

MLA Handbook (7th Edition):

Foster, Kean. “Hydrological Seasonal Forecasting.” 2019. Web. 19 Sep 2019.

Vancouver:

Foster K. Hydrological Seasonal Forecasting. [Internet] [Doctoral dissertation]. University of Lund; 2019. [cited 2019 Sep 19]. Available from: http://lup.lub.lu.se/record/bf1784c2-8d69-4f7a-8963-30fb26b59a25 ; http://portal.research.lu.se/ws/files/69071987/e_spikex_kean_nr2.pdf.

Council of Science Editors:

Foster K. Hydrological Seasonal Forecasting. [Doctoral Dissertation]. University of Lund; 2019. Available from: http://lup.lub.lu.se/record/bf1784c2-8d69-4f7a-8963-30fb26b59a25 ; http://portal.research.lu.se/ws/files/69071987/e_spikex_kean_nr2.pdf


Duke University

2. Stapleton, Jennifer Rebecca. SINGLE UNIT AND ENSEMBLE RESPONSE PROPERTIES OF THE GUSTATORY CORTEX IN THE AWAKE RAT .

Degree: 2007, Duke University

Most studies of gustatory coding have been performed in either anesthetized or awake, passively stimulated rats. In this dissertation the influences of behavioral state on gustatory processing in awake rats are described. In the first set of experiments, the effects of non-contingent tastant delivery on the chemical tuning of single neurons were explored. Tastants were delivered non-contingently through intra-oral cannulas to restrained, non water-deprived rats while single unit responses were recorded from the gustatory cortex (GC). As the subjects' behavior progressed from acceptance to rejection of the tastants, the chemical tuning of the neurons changed as well. This suggests that the subjects' behavioral state powerfully influences gustatory processing. In the second set of experiments, rats were trained to lick for fluid reinforcement on an FR5 schedule while single unit activity was recorded from GC. In this case, the chemical tuning was much more stable. Under this paradigm, chemosensory responses were rapid (~ 150 ms) and broadly tuned. In the third study, it was found that ensembles of GC neurons could discriminate between tastants and their concentrations on a single trial basis, and such discrimination was accomplished with a combination of rate and temporal coding. Ensembles of GC neurons also anticipated the identity of the upcoming stimulus when the tastant delivery was predictable. Finally, it was found that ensembles of GC neurons could discriminate between the bitter stimuli nicotine and quinine. Nicotine is both a bitter tastant and a trigeminal stimulant, and when the acetylcholine receptors in the lingual epithelium were blocked with mecamylamine, the ensembles failed to discriminate nicotine from quinine.

Subjects/Keywords: Biology, Neuroscience; gustatory cortex; taste; generalized linear model; multi-unit electrophysiology; ensembles; fixed ratio schedule

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Stapleton, J. R. (2007). SINGLE UNIT AND ENSEMBLE RESPONSE PROPERTIES OF THE GUSTATORY CORTEX IN THE AWAKE RAT . (Thesis). Duke University. Retrieved from http://hdl.handle.net/10161/404

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Stapleton, Jennifer Rebecca. “SINGLE UNIT AND ENSEMBLE RESPONSE PROPERTIES OF THE GUSTATORY CORTEX IN THE AWAKE RAT .” 2007. Thesis, Duke University. Accessed September 19, 2019. http://hdl.handle.net/10161/404.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Stapleton, Jennifer Rebecca. “SINGLE UNIT AND ENSEMBLE RESPONSE PROPERTIES OF THE GUSTATORY CORTEX IN THE AWAKE RAT .” 2007. Web. 19 Sep 2019.

Vancouver:

Stapleton JR. SINGLE UNIT AND ENSEMBLE RESPONSE PROPERTIES OF THE GUSTATORY CORTEX IN THE AWAKE RAT . [Internet] [Thesis]. Duke University; 2007. [cited 2019 Sep 19]. Available from: http://hdl.handle.net/10161/404.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Stapleton JR. SINGLE UNIT AND ENSEMBLE RESPONSE PROPERTIES OF THE GUSTATORY CORTEX IN THE AWAKE RAT . [Thesis]. Duke University; 2007. Available from: http://hdl.handle.net/10161/404

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

3. Ben Houria, Zeineb. Optimisation de la gestion du service de maintenance biomédicale : Optimization of the biomedical maintenance service management.

Degree: Docteur es, Génie Industriel, 2016, Lyon; Université de Sfax (Tunisie)

Le milieu hospitalier est un monde à la fois sensible et complexe, sensible parce que la vie humaine est en jeu et complexe parce que les équipements médicaux augmentent en nombre et en complexité technique. Ainsi, afin de préserver le bon état de fonctionnement de ces équipements et à un niveau élevé de disponibilité, leur entretien est devenu l'une des préoccupations majeures des responsables de l’hôpital. L’objectif de cette thèse est de proposer, aux responsables de maintenance biomédicale dans les établissements de soins, des outils d’aide à la décision qui permettent une meilleure maitrise des coûts. Ceci en assurant la sécurité des patients et des utilisateurs et en maintenant des performances optimales de l’ensemble des équipements médicaux. Tout d’abord, une heuristique a été proposée pour le choix de l’internalisation ou de l’externalisation de la maintenance et pour la sélection du contrat adéquat. La sélection du contrat est basée sur un ensemble de critères tout en considérant la contrainte du budget disponible. Ensuite, afin d’améliorer la procédure proposée, nous avons proposé des outils d’aide à la décision multicritère pour le choix adéquat d’une stratégie de maintenance. Pour l’étude de la criticité des équipements médicaux et le choix de la maintenance, sept critères ont été étudiés en proposant un couplage de l’approche AHP « Analytical Hierarchy Process » à la technique TOPSIS « Technique for Order Performance by Similarity to Ideal Solution ». Comme les experts du service de maintenance présentaient une certaine incertitude dans leurs jugements, nous avons intégré l’évaluation linguistique floue dans l’étude de la criticité des équipements et dans la sélection de la stratégie de maintenance (Fuzzy AHP couplée avec Fuzzy TOPSIS). Un modèle mathématique MILP a été développé pour la définition des limites de la criticité afin de caractériser les trois stratégies de maintenance. Le bon choix de ces limites permet d’optimiser le coût de la maintenance en respectant le budget disponible. Enfin, un deuxième modèle mathématique MILP a été développé en se basant sur l’heuristique proposée. Ce modèle permet de sélectionner pour chaque équipement, la stratégie de maintenance, internaliser ou externaliser la maintenance et le type du contrat tout en considérant le budget disponible et la charge/capacité du service maintenance

The hospital is a world that is both sensitive and complex, sensitive because the human life is involved and complex because medical facilities are growing in number and in technical complexity. Then, the problem of the medical equipment maintenance in order to keep them in safe, reliable and with high level of availability has become a major preoccupation of the hospital. The objective of this thesis is to provide tools to help the biomedical maintenance service of the hospital to make decisions that allow a better control of costs, while ensuring patient and user safety and maintaining optimal performance of medical equipment. First, a heuristic has been proposed for the choice of…

Advisors/Committee Members: Masmoudi, Faouzi (thesis director), Masmoudi, Malek (thesis director).

Subjects/Keywords: Equipements médicaux; Stratégies de maintenance; Multicritère; AHP; TOPSIS; Ensembles flous; Internalisation/ externalisation; Modélisation mathématique; MILP; Medical equipment; Maintenance strategies; Multi-criteria; Prioritization; AHP; TOPSIS; Fuzzy set; Internalization/outsourcing; Mathematical model; MILP

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Ben Houria, Z. (2016). Optimisation de la gestion du service de maintenance biomédicale : Optimization of the biomedical maintenance service management. (Doctoral Dissertation). Lyon; Université de Sfax (Tunisie). Retrieved from http://www.theses.fr/2016LYSES057

Chicago Manual of Style (16th Edition):

Ben Houria, Zeineb. “Optimisation de la gestion du service de maintenance biomédicale : Optimization of the biomedical maintenance service management.” 2016. Doctoral Dissertation, Lyon; Université de Sfax (Tunisie). Accessed September 19, 2019. http://www.theses.fr/2016LYSES057.

MLA Handbook (7th Edition):

Ben Houria, Zeineb. “Optimisation de la gestion du service de maintenance biomédicale : Optimization of the biomedical maintenance service management.” 2016. Web. 19 Sep 2019.

Vancouver:

Ben Houria Z. Optimisation de la gestion du service de maintenance biomédicale : Optimization of the biomedical maintenance service management. [Internet] [Doctoral dissertation]. Lyon; Université de Sfax (Tunisie); 2016. [cited 2019 Sep 19]. Available from: http://www.theses.fr/2016LYSES057.

Council of Science Editors:

Ben Houria Z. Optimisation de la gestion du service de maintenance biomédicale : Optimization of the biomedical maintenance service management. [Doctoral Dissertation]. Lyon; Université de Sfax (Tunisie); 2016. Available from: http://www.theses.fr/2016LYSES057

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