Letteratura scientifica selezionata sul tema "LMI and BMI"
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Articoli di riviste sul tema "LMI and BMI"
1
De-la-O, Alejandro, Lucas Jurado-Fasoli, Manuel J. Castillo, Luis Gracia-Marco, Ángel Gutierrez e Francisco J. Amaro-Gahete. "Relationship between 1,25-Dihydroxyvitamin D and Body Composition in Middle-Aged Sedentary Adults: The FIT-AGEING Study". Nutrients 11, n. 11 (24 ottobre 2019): 2567. http://dx.doi.org/10.3390/nu11112567.
Testo completoAbstract (sommario):
Vitamin D deficiency is a worldwide health problem that, in addition to its well-known negative effects on musculoskeletal health, has been related to a wide range of acute and chronic age-related diseases. However, little is known about the association of body composition with the active, hormonal form of vitamin D, 1,25-dihydroxyvitamin D plasma levels (1,25(OH)2D). Therefore, the aim of this study was to investigate the association of 1,25(OH)2D with body composition including lean and fat body mass as well as bone mineral density (BMD) in middle-aged sedentary adults. A total of 73 (39 women) middle-aged sedentary adults (53.7 ± 5.1 years old) participated in the current study. We measured weight and height, and we used dual energy X-ray absorptiometry to measure lean body mass, fat body mass and BMD. Body mass index (BMI), lean mass index (LMI), and fat mass index (FMI) were calculated. 1,25(OH)2D was measured using a DiaSorin Liaison® immunochemiluminometric analyzer. The results showed a negative association of 1,25(OH)2D with BMI, LMI and BMD (β = −0.274, R2 = 0.075, p = 0.019; β = −0.268, R2 = 0.072, p = 0.022; and β = −0.325, R2 = 0.105, p = 0.005, respectively), which persisted after controlling for age and sex. No significant differences in 1,25(OH)2D across body weight status were observed after controlling for the same covariates. In summary, our results suggest that 1,25(OH)2D could be negatively associated with BMI, LMI and BMD whereas no association was found with FMI in middle-aged sedentary adults.
2
Kananen, Laura, Markus Haapanen, Tuija Mikkola, Juulia Jylhävä, Niko Wasenius, Johan Eriksson e Mikaela von Bonsdorff. "FRAILTY IN MIDLIFE AS A PREDICTOR OF CHANGES IN BODY COMPOSITION FROM MIDLIFE INTO OLD AGE". Innovation in Aging 7, Supplement_1 (1 dicembre 2023): 1045–46. http://dx.doi.org/10.1093/geroni/igad104.3361.
Testo completoAbstract (sommario):
Abstract Few studies have investigated the association between frailty and subsequent body composition. We performed separate linear mixed model analyses in 996 adults (mean age at baseline[SD]: 61.5[2.9]) in a Finnish longitudinal birth cohort study to explore the relationships between changes in frailty status assessed by the Rockwood 41-item-frailty-index (FI) and changes in body mass index (BMI), lean mass index (LMI), fat mass index (FMI), and FMI to LMI-ratio values during 17 years of follow-up. With advancing age, LMI and BMI decreased, whereas FMI and FMI to LMI -ratio increased. Those who were frail (FI≥ 0.25) already at baseline, followed by those who became frail during the follow-up, experienced faster decreases in LMI and faster increases in FMI and FMI to LMI -ratio values relative to those who were ‘never frail’. Contrastingly, those in the highest third of absolute annual increase in FMI and FMI to LMI-ratio became frailer faster over time relative to those in the lowest third. We found evidence of an adverse health outcome of frailty where lean indices declined faster and fat indices and fat to lean -ratios increased faster from midlife into old age. The changes resembled those that occurred with aging, but at a faster pace. The relationship between body composition and frailty is likely bidirectional, where high or increasing levels of fat are associated with the risk of becoming frailer earlier, but where a longer duration of frailty may increase the risk of faster age-related changes to body composition.
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McClain, Kathleen M., Christine M. Friedenreich, Charles E. Matthews, Joshua N. Sampson, David P. Check, Darren R. Brenner, Kerry S. Courneya, Rachel A. Murphy e Steven C. Moore. "Body Composition and Metabolomics in the Alberta Physical Activity and Breast Cancer Prevention Trial". Journal of Nutrition 152, n. 2 (17 novembre 2021): 419–28. http://dx.doi.org/10.1093/jn/nxab388.
Testo completoAbstract (sommario):
Abstract Background Obesity is correlated with many biomarkers, but the extent to which these correlate with underlying body composition is poorly understood. Objectives Our objectives were to 1) describe/compare distinct contributions of fat/lean mass with BMI–metabolite correlations and 2) identify novel metabolite biomarkers of fat/lean mass. Methods The Alberta Physical Activity and Breast Cancer Prevention Trial was a 2-center randomized trial of healthy, inactive, postmenopausal women (n = 304). BMI (in kg/m2) was calculated using weight and height, whereas DXA estimated fat/lean mass. Ultra-performance liquid chromatography and mass spectrometry measured relative concentrations of serum metabolite concentrations. We estimated partial Pearson correlations between 1052 metabolites and BMI, adjusting for age, smoking, and site. Fat mass index (FMI; kg/m2) and lean mass index (LMI; kg/m2) correlations were estimated similarly, with mutual adjustment to evaluate independent effects. Results Using a Bonferroni-corrected α level <4.75 × 10–5, we observed 53 BMI-correlated metabolites (|r| = 0.24–0.42). Of those, 21 were robustly correlated with FMI (|r| > 0.20), 25 modestly (0.10 ≤ |r| ≤ 0.20), and 7 virtually null (|r| < 0.10). Ten of 53 were more strongly correlated with LMI than with FMI. Examining non–BMI-correlated metabolites, 6 robustly correlated with FMI (|r| = 0.24–0.31) and 2 with LMI (r = 0.25–0.26). For these, correlations for fat and lean mass were in opposing directions compared with BMI-correlated metabolites, in which correlations were mostly in the same direction. Conclusions Our results demonstrate how a thorough evaluation of the components of fat and lean mass, along with BMI, provides a more accurate assessment of the associations between body composition and metabolites than BMI alone. Such an assessment makes evident that some metabolites correlated with BMI predominantly reflect lean mass rather than fat, and some metabolites related to body composition are not correlated with BMI. Correctly characterizing these relations is important for an accurate understanding of how and why obesity is associated with disease.
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Hong, Yooha, e Hee-Jin Im. "0904 Exaggerated hypoxia burden of sleep apnea in patients with hyperacute lateral medullary infarction". SLEEP 46, Supplement_1 (1 maggio 2023): A398. http://dx.doi.org/10.1093/sleep/zsad077.0904.
Testo completoAbstract (sommario):
Abstract Introduction Acute lateral medullary infarction (LMI) can sometimes appear with respiratory failure in the acute stage. Polysomnographic investigations have shown a specific association between LMI and sleep apnea syndrome. The aim of our study was to investigate this association in hyperacute stage of LMI. Methods We investigated 8 patients who underwent polysomnography (PSG) for sleep apnea during hyperacute stage of LMI and compared the data to 8 healthy control subjects matched according to age, sex, body-mass index (BMI), and apnea-hypopnea index (AHI). The PSG was performed within an average of 1.5 days after the onset of neurological symptoms. PSG recordings in the hyperacute phase of LMI were analyzed. Results Six patients were males (75%) and two were females (25%). The average age of the patients was 51.9 ± 14.5 years and the average BMI was 27.2 ± 3.5. According to the AHI results of patients with LMI in the hyperacute phase, there were 2 (25%) cases of mild obstructive sleep apnea (OSA), 2 (25%) cased of moderate OSA, and 4 (50%) cases of severe OSA. The central sleep apnea index was higher in the patient group (4.3 ± 5.4/hr) than the control group 0.6 ± 0.4/hr) and was statistically significant (p=0.035). On the other hand, sleep parameters (obstructive sleep apnea index, respiratory arousal index, mean saturation) related to obstructive sleep apnea were poor in the control group. Conclusion Our study showed that sleep apnea syndrome, particularly CSA, is common in the hyperacute phase of LMI compared to control group. Early recognition of this problem and appropriate intervention may minimize the adverse effects on the respiratory system and improve the prognosis. Further and follow-up studies are needed to clarify the clinical significance and appropriate treatment options in these patients. Support (if any)
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Levi Micheli, Matteo, Roberto Cannataro, Massimo Gulisano e Gabriele Mascherini. "Proposal of a New Parameter for Evaluating Muscle Mass in Footballers through Bioimpedance Analysis". Biology 11, n. 8 (6 agosto 2022): 1182. http://dx.doi.org/10.3390/biology11081182.
Testo completoAbstract (sommario):
The evaluation of muscle mass in athletes correlates with sports performance directly. Bioimpedance vector analysis is a growing method of assessing body composition in athletes because it is independent of predictive formulas containing variables such as body weight, ethnicity, age, and sex. The study aims to propose a new parameter (Levi’s Muscle Index, LMI) that evaluates muscle mass through raw bioelectrical data. A total of 664 male footballers underwent bioimpedance assessment during the regular season. LMI was correlated with body cell mass (BCM) and phase angle (PA) to establish efficacy. The footballers were 24.5 ± 5.8 years old, 180.7 ± 5.9 cm tall and weighed 76.3 ± 7.1 kg. The relationships were: LMI-BMI: r = 0.908, r2 = 0.824, p < 0.001; LMI-PA: r = 0.704, r2 = 0.495, p = 0.009 and PA-BCM: r = 0.491, r2 = 0.241, p < 0.001. The results obtained confirm that LMI could be considered a new parameter that provides reliable information to evaluate the muscle mass of athletes. Furthermore, the higher LMI-BCM relationship than PA-BCM demonstrates specificity for muscle mass evaluation in athletes regardless of body weight, ethnicity, age, and sex.
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Bradshaw, Patrick T., Jose P. Zevallos, Kathy Wisniewski e Andrew F. Olshan. "A Bayesian Sensitivity Analysis to Partition Body Mass Index Into Components of Body Composition: An Application to Head and Neck Cancer Survival". American Journal of Epidemiology 188, n. 11 (5 settembre 2019): 2031–39. http://dx.doi.org/10.1093/aje/kwz188.
Testo completoAbstract (sommario):
Abstract Previous studies have suggested a “J-shaped” relationship between body mass index (BMI, calculated as weight (kg)/height (m)2) and survival among head and neck cancer (HNC) patients. However, BMI is a vague measure of body composition. To provide greater resolution, we used Bayesian sensitivity analysis, informed by external data, to model the relationship between predicted fat mass index (FMI, adipose tissue (kg)/height (m)2), lean mass index (LMI, lean tissue (kg)/height (m)2), and survival. We estimated posterior median hazard ratios and 95% credible intervals for the BMI-mortality relationship in a Bayesian framework using data from 1,180 adults in North Carolina with HNC diagnosed between 2002 and 2006. Risk factors were assessed by interview shortly after diagnosis and vital status through 2013 via the National Death Index. The relationship between BMI and all-cause mortality was convex, with a nadir at 28.6, with greater risk observed throughout the normal weight range. The sensitivity analysis indicated that this was consistent with opposing increases in risk with FMI (per unit increase, hazard ratio = 1.04 (1.00, 1.08)) and decreases with LMI (per unit increase, hazard ratio = 0.90 (0.85, 0.95)). Patterns were similar for HNC-specific mortality but associations were stronger. Measures of body composition, rather than BMI, should be considered in relation to mortality risk.
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Ong, Yi Ying, Jonathan Y. Huang, Navin Michael, Suresh Anand Sadananthan, Wen Lun Yuan, Ling-Wei Chen, Neerja Karnani et al. "Cardiometabolic Profile of Different Body Composition Phenotypes in Children". Journal of Clinical Endocrinology & Metabolism 106, n. 5 (1 febbraio 2021): e2015-e2024. http://dx.doi.org/10.1210/clinem/dgab003.
Testo completoAbstract (sommario):
Abstract Context Cardiometabolic profiles of different body composition phenotypes are poorly characterized in young children, where it is well established that high adiposity is unfavorable, but the role of lean mass is unclear. Objective We hypothesized that higher lean mass attenuates cardiometabolic risk in children with high fat mass. Methods In 6-year-old children (n = 377) from the Growing Up in Singapore Towards healthy Outcomes (GUSTO) prospective birth cohort, whole-body composition was measured by quantitative magnetic resonance, a novel validated technology. Based on fat mass index (FMI) and lean mass index (LMI), 4 body composition phenotypes were derived: low FMI-low LMI (LF-LL), low FMI-high LMI (LF-HL), high FMI-low LMI (HF-LL), high FMI-high LMI (HF-HL). Main Outcome Measures Body mass index (BMI) z-score, fasting plasma glucose, insulin resistance, metabolic syndrome risk score, fatty liver index, and blood pressure Results Compared with the LF-HL group, children in both high FMI groups had increased BMI z-score (HF-HL: 1.43 units 95% CI [1.11,1.76]; HF-LL: 0.61 units [0.25,0.96]) and metabolic syndrome risk score (HF-HL: 1.64 [0.77,2.50]; HF-LL: 1.28 [0.34,2.21]). The HF-HL group also had increased fatty liver index (1.15 [0.54,1.77]). Girls in HF-HL group had lower fasting plasma glucose (–0.29 mmol/L [–0.55,–0.04]) and diastolic blood pressure (–3.22 mmHg [–6.03,–0.41]) than girls in the HF-LL group. No similar associations were observed in boys. Conclusion In a multi-ethnic Asian cohort, lean mass seemed to protect against some cardiometabolic risk markers linked with adiposity, but only in girls. The FMI seemed more important than lean mass index in relation to cardiometabolic profiles of young children.
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Gargiulo, Sara, Matteo Gramanzini, Rosario Megna, Adelaide Greco, Sandra Albanese, Claudio Manfredi e Arturo Brunetti. "Evaluation of Growth Patterns and Body Composition in C57Bl/6J Mice Using Dual Energy X-Ray Absorptiometry". BioMed Research International 2014 (2014): 1–11. http://dx.doi.org/10.1155/2014/253067.
Testo completoAbstract (sommario):
The normal growth pattern of female C57BL/6J mice, from 5 to 30 weeks of age, has been investigated in a longitudinal study. Weight, body surface area (BS), and body mass index (BMI) were evaluated in forty mice. Lean mass and fat mass, bone mineral content (BMC), and bone mineral density (BMD) were monitored by dual energy X-ray absorptiometry (DEXA). Weight and BS increased linearly (16.15±0.64–27.64±1.42 g;51.13±0.74–79.57±2.15 cm2,P<0.01), more markedly from 5 to 9 weeks of age(P<0.001). BMD showed a peak at 17 weeks (0.0548±0.0011 g/cm2*m,P<0.01). Lean mass showed an evident gain at 9 (15.8±0.8 g,P<0.001) and 25 weeks (20.5±0.3 g,P<0.01), like fat mass from 13 to 17 weeks (2.0±0.4–3.6±0.7 g,P<0.01). BMI and lean mass index (LMI) reached the highest value at 21 weeks (3.57±0.02–0.284±0.010 g/cm2, resp.), like fat mass index (FMI) at 17 weeks (0.057±0.009 g/cm2) (P<0.01). BMI, weight, and BS showed a moderate positive correlation (0.45–0.85) with lean mass from 5 to 21 weeks. Mixed linear models provided a good prediction for lean mass, fat mass, and BMD. This study may represent a baseline reference for a future comparison of wild-type C57BL/6J mice with models of altered growth.
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Soliman, Hisham M., e Mahmoud Soliman. "Design of Observer-Based Robust Power System Stabilizers". International Journal of Electrical and Computer Engineering (IJECE) 6, n. 5 (11 agosto 2016): 1956. http://dx.doi.org/10.11591/ijece.v6i5.11802.
Testo completoAbstract (sommario):
<p>Power systems are subject to undesirable small oscillations that might grow to cause system shutdown and consequently great loss of national economy. The present manuscript proposes two designs for observer-based robust power system stabilizer (PSS) using Linear Matrix Inequality (LMI) approach to damp such oscillations. A model to describe power system dynamics for different loads is derived in the norm-bounded form. The first controller design is based on the derived model to achieve robust stability against load variation. The design is based on a new Bilinear matrix inequality (BMI) condition. The BMI optimization is solved interatively in terms of Linear Matrix Inequality (LMI) framework. The condition contains a symmetric positive definite full matrix to be obtained, rather than the commonly used block diagonal form. The difficulty in finding a feasible solution is thus alleviated. The resulting LMI is of small size, easy to solve. The second PSS design shifts the closed loop poles in a desired region so as to achieve a favorite settling time and damping ratio via a non-iterative solution to a set of LMIs. The approach provides a systematic way to design a robust output feedback PSS which guarantees good dynamic performance for different loads. <span style="font-size: 10px;">Simulation results based on single-machine and multi-machine power system models verify the ability of the proposed PSS to satisfy control objectives for a wide range of load conditions.</span></p>
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Soliman, Hisham M., e Mahmoud Soliman. "Design of Observer-Based Robust Power System Stabilizers". International Journal of Electrical and Computer Engineering (IJECE) 6, n. 5 (11 agosto 2016): 1956. http://dx.doi.org/10.11591/ijece.v6i5.pp1956-1966.
Testo completoAbstract (sommario):
<p>Power systems are subject to undesirable small oscillations that might grow to cause system shutdown and consequently great loss of national economy. The present manuscript proposes two designs for observer-based robust power system stabilizer (PSS) using Linear Matrix Inequality (LMI) approach to damp such oscillations. A model to describe power system dynamics for different loads is derived in the norm-bounded form. The first controller design is based on the derived model to achieve robust stability against load variation. The design is based on a new Bilinear matrix inequality (BMI) condition. The BMI optimization is solved interatively in terms of Linear Matrix Inequality (LMI) framework. The condition contains a symmetric positive definite full matrix to be obtained, rather than the commonly used block diagonal form. The difficulty in finding a feasible solution is thus alleviated. The resulting LMI is of small size, easy to solve. The second PSS design shifts the closed loop poles in a desired region so as to achieve a favorite settling time and damping ratio via a non-iterative solution to a set of LMIs. The approach provides a systematic way to design a robust output feedback PSS which guarantees good dynamic performance for different loads. <span style="font-size: 10px;">Simulation results based on single-machine and multi-machine power system models verify the ability of the proposed PSS to satisfy control objectives for a wide range of load conditions.</span></p>
Tesi sul tema "LMI and BMI"
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Stoica, Cristina. "Robustification de lois de commande prédictives multivariables". Phd thesis, Université Paris Sud - Paris XI, 2008. http://tel.archives-ouvertes.fr/tel-00345415.
Testo completoAbstract (sommario):
Cette thèse propose une méthodologie hors ligne pour la robustification de lois de commande prédictives multivariables, se basant sur une problématique d'optimisation convexe d'un paramètre de Youla. Le point de départ de la démarche consiste à synthétiser une loi de commande initiale prédictive multivariable sous forme d'état qui stabilise le système. Le but est de garantir la robustesse en stabilité face à des incertitudes non structurées et d'assurer des performances nominales pour le rejet de perturbations, imposées sous la forme des gabarits temporels sur les sorties. Ce problème d'optimisation est résolu par un formalisme LMI. Le paramètre de Youla obtenu permet de gérer d'une part le compromis entre la robustesse en stabilité et les performances nominales et d'une autre part permet de réduire l'influence du couplage multivariable sur le rejet des perturbations.Le cas de systèmes incertains appartenant à un ensemble donné d'incertitudes polytopiques est également traité. Deux possibilités sont analysées : le correcteur MPC initial stable sur tout le domaine polytopique, le correcteur MPC initial instable sur une partie du domaine incertain considéré. Dans les deux cas, une condition supplémentaire BMI est ajoutée pour chaque sommet du polytope considéré. Il s'agit de deux problèmes d'optimisation non-convexe pour lesquels deux solutions de complexité raisonnable sous une forme LMI sous-optimale sont proposées.
Cette technique de robustification est illustrée sur un modèle académique multivariable d'un réacteur. Une application à un robot médical est ensuite détaillée. L'ensemble des stratégies développées pour réduire l'influence des incertitudes non structurées sur le système en respectant les gabarits imposés sur les sorties pour le rejet de perturbations a donné lieu à la mise au point d'un logiciel sous MATLABTM.
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Farges, Christophe. "Méthodes d'analyse et de synthèse robustes pour les systèmes linéaires périodiques". Phd thesis, Université Paul Sabatier - Toulouse III, 2006. http://tel.archives-ouvertes.fr/tel-00132343.
Testo completoAbstract (sommario):
Cette thèse porte sur la commande robuste des systèmes linéaires périodiques qui constituent une classe particulière de systèmes variant dans le temps. Des dynamiques périodiques apparaissent dans de nombreux domaines des sciences de l'ingénieur tels que l'aéronautique, l'espace ou les systèmes de télécommunication. Des méthodes systématiques pour l'analyse et la synthèse robuste de ces systèmes sont proposées. Le cadre de travail choisi est celui de la théorie de Lyapunov et fait appel principalement à des outils numériques de type inégalités matricielles linéaires (LMI). La robustesse est envisagée de manière duale par la prise en compte d'incertitudes pouvant non seulement affecter le système à commander mais également le correcteur lui même. Ce dernier problème est traité par la synthèse d'ensembles convexes de correcteurs assurant un certain niveau de performances garanties vis-à-vis du système bouclé. La question de la structure temporelle du correcteur est également posée. Le correcteur doit il nécessairement être de même périodicité que le système? Est-il possible de réduire le nombre de paramètres à mémoriser? Pour répondre à ces différentes questions, nous avons défini la classe des correcteurs périodiques structurés dans le temps et développé des méthodes de synthèse adaptées. Les résultats théoriques sont illustrés sur le problème du maintien à poste autonome d'un satellite en orbite basse consistant à maintenir un satellite sur une orbite de référence excentrique malgré les différentes forces perturbatrices pouvant l'en écarter (frottement atmosphérique, effet de la distribution non-sphérique de la masse de la Terre). Différentes lois de commande minimisant certains critères de performances tels que la quantité de carburant consommée ou l'influence d'accélérations perturbatrices sont calculées. Leur qualité est ensuite évaluée à l'aide de simulations non-linéaires.
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GUELTON, Kevin. "Estimation des caractéristiques du mouvement humain en station debout. Mise en œuvre d'observateurs flous sous forme descripteur". Phd thesis, Université de Valenciennes et du Hainaut-Cambresis, 2003. http://tel.archives-ouvertes.fr/tel-00007960.
Testo completoAbstract (sommario):
La neurophysiologie et la biomécanique constituent deux approches complémentaires à la compréhension globale de la régulation posturale. Le corps humain est considéré comme un système mécanique poly-articulé régulé par le système nerveux central. Ses entrées sont les couples articulaires et ses sorties les positions des segments corporels. Au vu des stratégies posturales employées en station debout, un modèle non linéaire en double pendule inversé est adopté. Il dépend de paramètres pouvant être estimés par des tables anthropométriques standards. Pour ajuster le modèle à un individu particulier, un recuit simulé est utilisé. Les couples articulaires sont classiquement estimés par des techniques de dynamique inverse sensibles aux incertitudes de mesure. Une méthode alternative issue du domaine de l'automatique, basée l'utilisation d'observateurs à entrées inconnues, est proposée. L'étude d'une classe d'observateurs flous de type Takagi-Sugeno basés sur une forme descripteur est proposée. Les conditions de convergence sont obtenues par une fonction de Lyapunov quadratique et peuvent être conservatives. Quatre approches, admettant une écriture sous la forme de problèmes LMI ou BMI, sont alors proposées afin de relâcher ces conditions. La mise en œuvre d'un observateur flou à entrées inconnues dans le cas de l'homme en station debout est proposée. Les résultats obtenus sont confrontés à ceux des différentes approches de la dynamique inverse. L'observateur flou semble mieux adapté à l'estimation des caractéristiques du mouvement en station debout. De plus son caractère temps réel est souligné et conduit à de nombreuses perspectives en rééducation.
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Benlatreche, Adlane Abdelkader. "Contribution à la commande robuste H∞ de systèmes à grande échelle d’enroulement de bandes flexibles". Université Louis Pasteur (Strasbourg) (1971-2008), 2007. https://publication-theses.unistra.fr/public/theses_doctorat/2007/BENLATRECHE_Adlane_Abdelkader_2007.pdf.
Testo completoAbstract (sommario):
Les contraintes actuelles de production de bandes flexibles, telles que l’augmentation de la vitesse de défilement associée à une diminution de l’épaisseur des bandes élastiques et l’absence de connaissances académiques du comportement matériau –procédé, placent les industriels dans des situations difficiles. Ils ont besoin de connaître les lois de réglage des machines pour éviter de générer dans l’entraînement de bande des perturbations qui occasionnent des défauts d’enroulement ou des arrêts de production. L’objectif de ce travail a consisté à développer des méthodes d’analyse et de synthèse de commandes robustes décentralisées pour des systèmes d’entraînement de bandes flexibles à nombreux moteurs dans un contexte d’utilisation comparable à celui rencontré en production industrielle : bande mince, vitesse de défilement élevée. Dans ce but, nous présentons dans ce manuscrit des correcteurs H∞ multivariables avec un ou deux degrés de liberté (ddl), avec et sans intégrateur explicite, appliqués aux systèmes d’enroulement. Différentes structures de correcteurs sont considérées : un correcteur centralisé et des correcteurs décentralisés, avec ou sans recouvrement. Une méthode de conception d’une commande par retour d’état, appliquée aux systèmes d’enroulement et utilisant une résolution d’inégalité matricielle bilinéaire (BMI), est proposée et discutée. Des résultats de simulation sont donnés basés sur un modèle non linéaire identifié sur un banc expérimental. Des résultats expérimentaux sont également donnés sur ce même banc expérimentalIn web transport systems, the main concern is to control independently speed and tension in spite of perturbations such as radius variations and changes of set point. Nevertheless, in these control techniques, tracking properties and perturbation rejection are interdependent and cannot be specified separately. In this thesis, we first present multivariable decentralised H∞ controllers with one or two degrees of freedom (DOF), with and without explicit integrator, applied to winding systems. Different controller structures are then considered: centralised and semi-decentralised controllers with or without overlapping. The 2DOF approach improves significantly the disturbance rejection while reducing the coupling between tension and velocity. The use of decentralised control leads to performance deterioration as compared to centralised control. The off-diagonal elements of the plant are represented as uncertainties. This enables to analyse the stability of a decentralised control structure. Finally, multivariable H∞ controllers are presented, with and without integrator, applied to winding systems and determined by a bilinear matrix inequality (BMI) approach. This method consists in designing state feedback control with the use of BMI optimisation. Insertion of full or partial integral action is discussed. Simulation results are given based on a nonlinear model identified on a 3-motor winding test bench. Experimental results have also been obtained on this setup
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Huffman, Hannah E. "The relationship between body composition and clinical outcomes in pediatric cystic fibrosis". The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1583597480946455.
Testo completo
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Thévenet, Jean-Baptiste. "Techniques d'optimisation avancées pour la synthèse de lois de commande". Toulouse 3, 2005. http://www.theses.fr/2005TOU30125.
Testo completoAbstract (sommario):
La résolution de nombreux problèmes d'automatique n'est pas couverte par les techniques disponibles actuellement. Elle nécessite des développements algorithmiques importants en optimisation, dans le domaine des inégalités matricielles non-convexes. Cette thèse met en oeuvre plusieurs approches complémentaires dans ce contexte. En premier lieu, les méthodes "spectral SDP", baseés sur l'utilisation de Lagrangiens augmentés, nous conduisent à la conception d'un logiciel, specSDP, et à la résolution d'un grand nombre de problèmes en commande : synthèse multimodèle ou structurée, contrôle d'ordre réduit. Une étude de convergence locale est également menée pour le cas classique, présageant d'évolutions positives. La deuxième approche proposée s'inspire d'une formulation non-lisse des problèmes BMI et des techniques associées. Nous exhibons, pour cette méthode, des résultats numériques probants, obtenus sur des exemples de grande dimension, qui mettent en échec les rares méthodes existantesThis thesis research area belongs to the class of nonlinear semidefinite programming, an emerging and challenging domain in optimization which is of central importance in robust control and relaxation of hard decision problems. Our contribution addresses convergence of algorithms, practical implementations and testing on applications in the field of reduced-order output feedback control. Firstly, our augmented Lagrangian-type "spectral SDP" method has shown to be extremely efficient on a variety of middle-scale BMI programs, including simultaneous, structured, or mixed H2/Hinf synthesis problems. Local convergence properties of the algorithm were studied as well, as far as classical nonlinear programs are concerned. On the other hand, we then focused on nonsmooth strategies for large bilinear matrix inequalities. Problems with up to a few thousand variables were successfully handled through this method, where alternative approaches usually give failure
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Mohammedi, Irryhl. "Contribution à l’estimation robuste par intervalle des systèmes multivariables LTI et LPV : Application aux systèmes aérospatiaux". Electronic Thesis or Diss., Bordeaux, 2024. http://www.theses.fr/2024BORD0142.
Testo completoAbstract (sommario):
Les travaux présentés dans ce mémoire de thèse visent à développer de nouvelles approches basées sur une nouvelle classe particulière d’estimateurs d´état : les filtres dits par intervalles. Tout comme la classe des observateurs intervalles, l’objectif est d’estimer les bornes supérieures et inférieures des états d’un système, à chaque instant de temps. L’approche proposée repose sur la théorie des systèmes monotones et sur la connaissance a priori du domaine d’appartenance, supposé borné, des incertitudes de modèle et des entrées exogènes (perturbations, bruit de mesure, etc). L’élément clé de l’approche proposée repose sur l’utilisation de filtre d’ordre quelconque, sans structure a priori fixée, plutôt qu’une structure basée sur l’observateur (reposant uniquement sur une structure dynamique du système étudié). La synthèse des paramètres du filtre repose sur la résolution d’un problème d’optimisation sous contraintes de type inégalités matricielles linéaires et bilinéaires (LMI et BMI) permettant de garantir simultanément les conditions d’existence du filtre ainsi qu’un niveau de performance, soit dans un contexte énergie, soit dans un contexte amplitude ou soit dans un contexte mixte énergie/amplitude. La méthodologie de synthèse proposée est illustrée sur un exemple académique et est comparée avec d’autres méthodes existantes dans la littérature. Enfin, la méthodologie est appliquée au cas du contrôle d’attitude et d’orbite d’un satellite, sous des conditions de simulations réalistesThe work of this thesis aims at developing new approaches based on a new particular class of state estimators, the so-called interval or ensemble filters.Like the class of interval observers, the objective is to estimate, in a guaranteed way, the upper and lower bounds of the states of a system, at each time instant.The proposed approach is based on the theory of monotonic systems and on the knowledge of the domain of membership, supposedly bounded, of the uncertainties of the system, such as disturbances, noise and bias of sensors, etc.The key element of the proposed approach is to use a filter structure advantage, rather than an observer-based structure (relying only on a dynamic structure of the studied system).The synthesis of the filter parameters is based on the resolution of a constrained optimization problem of linear and bilinear matrix inequalities (LMI and BMI) allowing to guarantee simultaneously the existence conditions of the filter as well as a performance level, either in an energy context for LTI systems, or in an amplitude context or in a mixed energy/amplitude context for LPV systemsThe proposed synthesis methodology is illustrated on an academic example and is compared with other existing methods in the literature. Finally, the methodology is applied to the case of attitude and acceleration control of a satellite, under realistic simulation conditions
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SALES, DECILIO DE MEDEIROS. "CONTROL PROBLEM SOLUTIONS BY FREQUENCY DEPENDENT BMIS AND LMIS". PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2000. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=8385@1.
Testo completoAbstract (sommario):
CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICONesta tese, é apresentado e analisado em termos da propriedade de convergência global um novo algoritmo para problemas de otimização quadrática sujeitos ou a restrições de desigualdades matriciais bilineares (BMIs) ou a restrições de desigualdades matriciais lineares (LMIs) dependentes da freqüência, estes problemas são muito relevantes para a teoria de controle porque uma ampla classe de controladores (por exemplo, controladores H2/Hinf de ordem fixa, síntese de controladores descentralizados, análise do desempenho robusto H2 ou Hinf, etc.) pode ser computada a partir da solução de problemas de otimização desta natureza. Infelizmente, estes problemas são reconhecidamente de difícil solução, pois envolvem, entre outras coisas, não convexidade (restrição BMI), não diferenciabilidade da restrição, etc. em função dessa complexibilidade, algumas alternativas para a obtenção de soluções aproximadas têm sido adotada na literatura especializada recente (Safonov, 1994; Paganini, 1996). O algoritmo proposto neste trabalho de tese é uma alternativa para as abordagens atuais com vantagens no sentido de permitir a obtenção de melhores aproximações assim como a possibilidade de explorar a estrutura particular de cada problema de interesse e, com isso, viabilizar do ponto de vista computacional o projeto de controladores envolvendo plantas de ordem mais elevada. Este algoritmo pode ser visto como a generalização de um algoritmo anterior com boas propriedades proposto por Corrêa & Sales (1998) para problemas quadráticos sujeitos a restrições envolvendo LMIs canônicas. De forma bastante genética, a solução do problema original (um problema envolvendo um número infinito de restrições é substituído por uma única) onde, em cada passo do algoritmo, a restrição é interativamente modificada. Demonstrar-se-á que para problemas quadráticos envolvendo restrições BMIs (problemas não convexos) a seqüência de soluções geradas pelo algoritmo convergirá para a solução ótima global do problema original. Por outro lado, no caso dos problemas quadráticos envolvendo restrições LMIs dependentes da freqüência, a seqüência gerada de custos auxiliares é monótona crescente e, adicionalmente, se a seqüência de matrizes de ponderação for limitada superiormente (uma condição suficiente), demonstrar-se-á que a seqüência de soluções geradas pelo algoritmo convergirá para a solução ótima global do problema original. Finalmente, são apresentadas algumas aplicações a problemas de controle acompanhadas de alguns exemplos numéricos ilustrativos.
In this thesis, it is proposed and analysed in terms of the global-convergence property a new algorithm for solving quadratic optimisation problems under either a BMI (bilinear matrix inequality) or a frequency-dependent LMI (linear matrix inequality) constraints. These problems are of special interest in the control literature a some very important control problems such as the H2/H(infinite) fixed-order controller, multiobjectives, H2 and H (infinite) robust performance analysis among others problems can be posed as problems of this kind for which does not still exist yet a reliable global convergent algorithm. Nowadays, approximate solutions to those problems are based upon grid and interpolation techniques as suggested by Paganini (1996) in the case of frequency- wise LMI constraints or branch and bound algorithms or branch and bound algorithms mainly and alternating LMIs as far as BMIs constraints are involved (Safonov, 1994). All of those approaches suffer, of course, from obvious numerical difficulties. In fact, those approaches were introduced as preliminary attempts in solving the problems just mentioned. The algorithm to presented here, which can be seen as a generalisation of an earlier algorithm proposed by Corrêa e Sales (1998) for solving standard feasibility LMIs problems, is a step forward in an attempt of handling difficulties not faced properly by those methodologies. In a broaden sense, the proposed algorithm solves the original problem (a problem subject to an infinite number of constraints is replaced by a single one properly chosen. It is worth noting that this basic idea was introduced by Lawson (1961) in a rather different context, namely, the problem of computing Tchebycheff approximations by means of sequences of weighted quadratic problems. It is pointed out here that in the case of quadratic problems under a BMI constraint (a nonconvex problem); it is proved that the sequence of auxiliary solutions generated by the algorithm converges to the global optimal solution of the original one. On the other hand, as for quadratic problems under a frequency-dependent LMI constraint (an infinite-dimensional problem) it is proved that the auxiliary cost-sequence values increases asymptotically and, If the weight updating sequence is bounded from above (a sufficient condition), the sequence of auxiliary solutions will converge to the optimal solution of the original problem as well. Finally, some applications to control problem are presented accompanied by some numerical examples.
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Alkaassem, Ahmad. "Mykotoxinscreening (Deoxynivalenol, Zearalenon) in Futter, Blut, Milch und Galle bei Kühen mit Labmagenverlagerung (LMV) und bei gesunden Kühen". Doctoral thesis, Universitätsbibliothek Leipzig, 2009. http://nbn-resolving.de/urn:nbn:de:bsz:15-20090331-071217-2.
Testo completoAbstract (sommario):
Einleitung: Ziel der vorliegenden Arbeit war es, mögliche Zusammenhänge zwischen einer Exposition von Milchkühen mit Mykotoxinen (DON, ZON und deren Metaboliten) und dem Entwickeln und Bestehen einer LMV sowie weiteren Primär- und Sekundärerkrankungen zu prüfen. Es bestand die Frage nach einer möglichen Beziehung zu klinischen Störungen, nach einer möglichen Korrelation von Veränderungen der Blutparameter und nach der Eignung von Gallensaft zum Mykotoxinnachweis. Material und Methoden: Für die Untersuchungen wurden 61 Kühe der Rasse Schwarzbunte aus dem Patientengut der Medizinischen Tierklinik mit der Diagnose LMV genutzt. Die gesunden Kontrollkühe (n = 13) stammten aus zwei Betrieben im Leipziger Umland. Bei der Aufnahme in die Klinik bzw. der Probenentnahme wurden alle Kühe klinisch untersucht. Für die Mykotoxinbestimmungen wurden von 20 Patienten- und 13 Kontrollkühen Futter, Serum, Milch und Galle sowie von 41 Patientenkühen Serum und Galle entnommen. Es wurden klinisch-chemische Parameter im Serum untersucht. Die Mykotoxine wurden mittels High-Performance-Liquid-Chromatography (HPLC) analysiert. Ergebnisse: Bei 36 von 61 Patienten konnten keine Mykotoxine in der Galle nachgewiesen werden. Bei den anderen 25 Tieren war ein positiver Mykotoxinnachweis erfolgt. Von den 36 Kühen mit negativem Mykotoxinnachweis konnten 20 Kühe (56 %) mit linksseitiger LMV und 8 Kühe (22 %) mit rechtsseitiger LMV als geheilt entlassen werden. Sechs Kühe (17 %) mit LMV nach links und negativem Mykotoxinnachweis und zwei Kühe (6 %) mit LMV nach rechts und negativem Mykotoxinnachweis hatten einen Exitus letalis. Von 25 Kühen mit positivem Mykotoxinnachweis wurden zwölf Kühe (48 %) mit der Diagnose LMV nach links und sechs Kühe (24 %) mit LMV nach rechts geheilt. Fünf Kühe (20 %) mit LMV nach links und zwei Kühe (8 %) mit LMV nach rechts hatten einen Exitus letalis. Die makroskopische Untersuchung der Futterproben ergab keine grobsinnlichen Veränderungen. Mykotoxine konnten hingegen regelmäßig in den Futterproben aus den Herkunftsbetrieben der Patienten und der gesunden Kühe nachgewiesen werden. Der Median betrug für DON 0,161 mg/kg (0,086-0,191) und für ZON 6,35 µg/kg (4,88-7,85). Im Serum enthielten eine von 61 Proben DON (0,002 µg/mL) und weitere vier Proben DOM-1 (0,002-0,003-0,004-0,009 µg/mL). Im Gallensaft konnte bei 61 Proben nur einmal DOM-1 (37,6 µg/mL) und kein DON nachgewiesen werden. Die untersuchten Galleproben waren zu 39 % mit ZON bzw. dessen Metabolite belastet. Dabei lag ZON (ng/g) im Mittel bei 9,85 (8,10-16,33), α-ZOL bei 59,9 (5-78) ng/g und ß-ZOL bei 37,6 ng/g. Bei Patienten mit positivem Nachweis von ZON und seinen Metaboliten α- und ß-ZOL konnten keine Veränderungen am Genitaltrakt festgestellt werden. Bei den gesunden Kühen waren keine Mykotoxine in Serum, Milch oder Gallensaft nachweisbar. In den eigenen Untersuchungen ließen sich klinisch sowie biochemisch weder DON- noch ZON-spezifische Effekte nachweisen. Entweder waren die geprüften Parameter im physiologischen Bereich, wie z.B. Protein, Kreatinin, TEAC und im Blutbild, oder die Veränderungen waren auch bei den Kühen ohne nachweisbare Mykotoxine vorhanden, wie z.B. bei Bilirubin, Glucose, FFS, Cholesterol, BHB, CK, GGT, Mg, Ca, Na, K, Cl, FFS und im Säure-Basen-Status. Die mittleren GLDH-Aktivitäten aller Patienten mit DON-Nachweis waren geringgradig höher als bei Patienten ohne Mykotoxinnachweis. Schlussfolgerung: Mykotoxine konnten in dieser Untersuchung weder für spezifi-sche Symptome oder hämatologische sowie klinisch-chemische Abweichungen im Blut noch für den Krankheitsausgang, d.h. Heilung oder Exitus letalis, verantwortlich gemacht werden. Eine Ausnahme stellt die Frequenz und Intensität der Pansenkontraktionen dar, die bei Patienten mit positivem Mykotoxinnachweis im Futter reduziert waren. ZON- bzw. ZOL-assoziierte Veränderungen an den Ovarien und dem Uterus wurden makroskopisch in keinem Fall festgestellt. Als zusätzliche Erkenntnis stellte sich im Verlaufe dieser Arbeit unabhängig von der eigentlichen Fragestellung heraus, dass die Gallensaftentnahme in der Praxis eine leicht durchführbar, diagnostisch wertvolle Maßnahme darstellt. Abschließend kann festgestellt werden, dass die DON- und ZON-Kontaminationen in geringen Konzentrationen beim Milchrind keine besondere Gefahrenquelle darstellen, wenn die Haltungs- und Fütterungsbedingungen optimal gestaltet werden.
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Lei, Weiwei [Verfasser]. "Flexibilisierungstendenzen bei den gesetzlichen Erbquoten im chinesischen Erbrecht : Eine rechtsvergleichende Evaluation / Weiwei Lei". Frankfurt a.M. : Peter Lang GmbH, Internationaler Verlag der Wissenschaften, 2020. http://d-nb.info/1223310248/34.
Testo completoLibri sul tema "LMI and BMI"
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Shashibiya. Ha mu lai te: Hamlet. Beijing: Zhong guo wen lian chu ban she, 2016.
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Lan, Ziqiao. Shi yong bei lei. Taibei Shi: Taiwan sheng li bo wu guan chu ban bu, 1990.
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Lai, Jingyang. Taiwan di bei lei. Taibei Shi Beitou qu: Lei gu chu ban she, 1986.
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Ni, Jing. Lei luo qing bei. Taizhong Xian Dali Shi: Fei xiang wen hua shi ye you xian gong si, 2000.
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Zhang, Yibo. Ren: Jing li ren cheng gong yu shi bai de bei hou. Hang zhou: Hang zhou chu ban she, 2003.
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shan, Zhang yuan. Ren lei su miao. Shang hai: Shao nian er tong chu ban she, 2006.
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Page, Orange. Yu bei lei liao li. Hong Kong: Wan Li, 2002.
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Jingyi, Jiao, a cura di. Lai Xinxia shuo Bei yang. Shanghai Shi: Shanghai ke xue ji shu wen xian chu ban she, 2011.
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Yongke, Chen, a cura di. Bai yin da wei lai. Taibei Shi: Lian jing chu ban shi ye gu fen you xian gong si, 2013.
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Cai, Li Yong. Gua lei bai bian fa. Hong Kong: Qin & Yuan, 1992.
Cerca il testo completoCapitoli di libri sul tema "LMI and BMI"
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Voigtmann, R. "Der LAI-Test und sein diagnostischer Wert bei bösartigen Tumoren". In Tumormarker, 309–14. Heidelberg: Steinkopff, 1987. http://dx.doi.org/10.1007/978-3-642-88539-6_86.
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Zhu, Chunyan, e Xu Guo. "Research on Carbon Emission Characteristics and Influencing Factors of Logistics Industry: Based on EKC Model and LMDI Decomposition Method". In Proceedings of the 2020 International Conference on Resource Sustainability: Sustainable Urbanisation in the BRI Era (icRS Urbanisation 2020), 405–17. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-9605-6_28.
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Jeong, Seogsong, Yo Hwan Lim, Myeong Hoon Lee e Hyun Wook Han. "Predicted Body Composition Against COVID-19: A Potential Digital Health Strategy". In Studies in Health Technology and Informatics. IOS Press, 2024. http://dx.doi.org/10.3233/shti231265.
Testo completoAbstract (sommario):
This study focused on the associations between predicted lean body mass index (LBMI), appendicular skeletal muscle mass index (ASMI), and body fat mass index (BFMI) with the 2019 coronavirus disease (COVID-19). A nationwide population-based non-underweight cohort of 2,037,714 participants underwent two consecutive biennial health screening examinations, with changes in predicted body composition indices estimated using a multivariable-adjusted logistic regression model. Increased LBMI and ASMI were associated with a lower COVID-19 risk among men who became obese. In COVID-19 patients, increased LBMI, ASMI, and BFMI were associated with a higher risk of extracorporeal membrane oxygenation among obese men.
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Vomberg, Marieke, e Isabel Zorn. "Lernplattformen barrierearm gestalten". In Diversität Digital Denken – The Wider View. Eine Tagung des Zentrums für Lehrerbildung der Westfälischen Wilhelms-Universität Münster vom 08. bis 10.09.2021, 449–52. WTM-Verlag, 2022. http://dx.doi.org/10.37626/ga9783959871785.0.52.
Testo completoAbstract (sommario):
Der Beitrag beschäftigt sich damit, wie Prinzipien des Universal Design (UD) bei der Gestaltung von Learning Management Systemen (LMS) zu Barrierefreiheit beitragen, die mittlerweile gesetzlich verankert ist. Wichtig sind insb. die Etablierung von klaren Strukturen im LMS und deren technische Kennzeichnung für Screenreader, die Verwendung von möglichst unterschiedlichen, barrierearmen Medien und Alternativmedien und -texten, sowie die Aufbereitung für verschiedene Lerntypen. Interaktivität und Austausch sorgen für eine weitere Reduktion von Barrieren.
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"6.5 Larynxmaske LMA (laryngeal mask airway)". In Schwieriges Atemwegsmanagement bei Erwachsenen und Kindern, a cura di Ingeborg Dornberger. Stuttgart: Georg Thieme Verlag, 2013. http://dx.doi.org/10.1055/b-0034-60718.
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"7.11 Larynxmasken LMA, ProSeal-Masken PLMA". In Schwieriges Atemwegsmanagement bei Erwachsenen und Kindern, a cura di Ingeborg Dornberger. Stuttgart: Georg Thieme Verlag, 2013. http://dx.doi.org/10.1055/b-0034-60732.
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Meisterernst, Andreas. "III. Pflichtinformation bei vorverpackten Lebensmitteln gem. LMIV". In Lebensmittelrecht, 174–203. Verlag C.H.BECK oHG, 2024. http://dx.doi.org/10.17104/9783406798917-174.
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"Backmatter". In Trees Without Wind, 188. Columbia University Press, 2012. http://dx.doi.org/10.7312/li--16274-bm.
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Kar, Mikail. "New Indicators and Measurement Methods for Welfare in the Global Economy Era". In Research Anthology on Macroeconomics and the Achievement of Global Stability, 624–42. IGI Global, 2022. http://dx.doi.org/10.4018/978-1-6684-7460-0.ch034.
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This study discusses the inadequacy of GDP alone as a measure of welfare in the global economic age and examines alternative welfare indicators and measurement methods. This study, which discusses the human development index (HDI), the inequality adjusted human development index (I-HDI), the gender inequality index (GII), the multidimensional poverty index (MPI), the social progress index (SPI), the happy planet index (HPI), the better life index (BLI), the Legatum prosperity index(LPI), the human capital index (HCI), and the ecological footprint (EF) methods, shares the country rankings of these methods and reveals the differences in the results depending on the method. It also draws attention to the differences between the economic size and welfare level by sharing the rankings of the world's 10 largest economies in alternative methods. In addition, the study examines the obstacles to the inability to establish a complete, precise, and generally accepted method of measuring welfare.
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Kar, Mikail. "New Indicators and Measurement Methods for Welfare in the Global Economy Era". In Advances in Finance, Accounting, and Economics, 8–32. IGI Global, 2022. http://dx.doi.org/10.4018/978-1-7998-8258-9.ch002.
Testo completoAbstract (sommario):
This study discusses the inadequacy of GDP alone as a measure of welfare in the global economic age and examines alternative welfare indicators and measurement methods. This study, which discusses the human development index (HDI), the inequality adjusted human development index (I-HDI), the gender inequality index (GII), the multidimensional poverty index (MPI), the social progress index (SPI), the happy planet index (HPI), the better life index (BLI), the Legatum prosperity index(LPI), the human capital index (HCI), and the ecological footprint (EF) methods, shares the country rankings of these methods and reveals the differences in the results depending on the method. It also draws attention to the differences between the economic size and welfare level by sharing the rankings of the world's 10 largest economies in alternative methods. In addition, the study examines the obstacles to the inability to establish a complete, precise, and generally accepted method of measuring welfare.
Atti di convegni sul tema "LMI and BMI"
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Wang, Yan, e Rajesh Rajamani. "A Sequential LMI Approach for Design of a Gain-Scheduled PID Controller for LPV Systems". In ASME 2017 Dynamic Systems and Control Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/dscc2017-5199.
Testo completoAbstract (sommario):
This paper aims at developing a robust gain-scheduled proportional-integral-derivative (PID) control design method for a linear-parameter-varying (LPV) system. It is recognized in the literature that robust fixed-order controller design can be formulated as a feasibility problem of a bilinear matrix inequality (BMI) constraint. Unfortunately, the search for a feasible solution of a BMI constraint is a NP hard problem in general. A common way to solve this dilemma is to apply a linearization method, such as variable change method or congruence transformation, to transform the BMI into LMI. The applicability of the linearization method depends on the specific structure of the problem at hand and cannot be generalized. This paper formulates the gain-scheduled PID controller design as a feasibility problem of a quadratic matrix inequality (QMI) constraint, which covers the BMI constraint as a special case. An augmentation of the newly developed sequential LMI optimization method is proposed to search for a feasible solution of a QMI constraint iteratively. In the application part, a vehicle lateral control problem is presented to demonstrate the applicability of the proposed algorithm to a real-world output feedback control design.
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Vozak, Daniel, e Vojtech Vesely. "Robust output feedback controllers for MIMO systems, BMI and LMI approach". In 2013 International Conference on Process Control (PC). IEEE, 2013. http://dx.doi.org/10.1109/pc.2013.6581398.
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Rodrigues, Mickael, Yongxin Wu, Samir Aberkane e Valerie Dos Santos Martins. "LMI & BMI technics for the design of a PI control for irrigation channels". In 2013 European Control Conference (ECC). IEEE, 2013. http://dx.doi.org/10.23919/ecc.2013.6669082.
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Mammar, Sai¨d, Lydie Nouvelie`re, Nicoleta Minoiu-Enache, Se´bastien Glaser, Benoit Lusetti e Dominique Gruyer. "Vehicle Yaw Motion Control Using Takagi-Sugeno Modeling and Quadratic Boundedness via Dynamic Output Feedback". In ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2010. http://dx.doi.org/10.1115/esda2010-24809.
Testo completoAbstract (sommario):
This paper presents the design and the simulation test of a Takagi-Sugeno (TS) fuzzy output feedback for yaw motion control. An integrated steering and differential braking controller based on invariant sets, quadratic boundedness theory and a common Lyapunov function has been developed. The TS fuzzy model is able to handle elegantly the nonlinear behavior the vehicle lateral dynamics. The computation of the control law has been achieved using Linear and Bilinear Matrix Inequalities (LMI-BMI) methods. Simulation test shows the controlled car is able to achieve the ISO3888-2 transient maneuver. Some design parameters can be adjusted to handle the tradeoff between safety constraints and comfort specifications.
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Abbas, H., S. M. Hashemi e H. Werner. "Decentralized LPV Gain-Scheduled PD Control of a Robotic Manipulator". In ASME 2009 Dynamic Systems and Control Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/dscc2009-2651.
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In this paper, low-complexity linear parameter-varying (LPV) modeling and control of a two-degrees-of-freedom robotic manipulator is considered. A quasi-LPV model is derived and simplified in order to facilitate LPV controller synthesis. An LPV gain-scheduled, decentralized PD controller in linear fractional transformation form is designed, using mixed sensitivity loop shaping to take — in addition to high tracking performance — noise and disturbance rejection into account, which are not considered in model-based inverse dynamics or computed torque control schemes. The controller design is based on the existence of a parameter-dependent Lyapunov function — employing the concept of quadratic separators — thus reducing the conservatism of design. The resulting bilinear matrix inequality (BMI) problem is solved using a hybrid gradient-LMI technique. Experimental results illustrate that the LPV controller clearly outperforms a decentralized LTI-PD controller and achieves almost the same accuracy as a model-based inverse dynamics and a full-order LPV controllers in terms of tracking performance while being of significantly lower complexity.
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Захарова, Галина Борисовна. "Информационное моделирование ландшафтов LIM: теория и практика". In VI Международная научно-практическая конференция «BIM-моделирование в задачах строительства и архитектуры». СПбГАСУ, 2023. http://dx.doi.org/10.23968/bimac.2023.006.
Testo completoAbstract (sommario):
Информационное моделирование зданий BIM как системный подход к управлению архитектурно-строительным проектированием находит своё применение не только для зданий, но распространяется и на другие объекты. В данной статье представлено направление LIM – информационное моделирование ландшафтов, в котором разработка архитектурно-ландшафтного проекта становится последовательностью взаимосвязанных этапов, интегрированных с точки зрения ГИС-данных и BIM-представления через формат IFC. Приведены примеры проектов с применением LIM. Отмечена актуальность более широкого внедрения технологии LIM в связи с реализацией федерального проекта «Формирование комфортной городской среды». Показан один из распространенных подходов к разработке проекта, результаты которого не всегда оптимальны. Сделан вывод о необходимости отработки технологических процессов с применением специально подобранного программного обеспечения и создания пилотных LIM-проектов.
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Deritti, Marco Deouro, e Maria do Carmo Duarte Freitas. "Aproximações conceituais do BIM x LIM". In XI SIMPÓSIO BRASILEIRO DE GESTÃO E ECONOMIA DA CONSTRUÇÃO. Antac, 2021. http://dx.doi.org/10.46421/sibragec.v11i00.41.
Testo completoAbstract (sommario):
The Building Information Modelling (BIM) has been increasingly more discussed due to the benefits it generates to civil construction since one of its advantages are the reductions that a BIM process can bring to the builder during the execution stage of an enterprise. In parallel to the BIM, there is the Lean Information Management (LIM), this concept aims the lean management of the information’s of a process, that searches for mitigating the excess or lack of information, quality warranty, and transparency of it. Considering the existence of these two scenarios, BIM and LIM, this paper aims to bring a conceptual approximation between both throughout the information management optics. The aim of this paper is to show the similarities between those two concepts, that even having different structures have the same aim, quality, and productivity. This paper used a literature review method searching for keywords, applying a filter to search for the approximation of them. As a conclusion, this article shows that there are similarities between those concepts and that is possible to do further research about the approximation between them and the benefits that both bring to civil construction.
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Гущин, Александр Николаевич, e Марина Николаевна Дивакова. "Проблемы переноса BIM технологий на ландшафтные модели (LIM-модели)". In VII Международная научно-практическая конференция «Информационное моделирование в задачах строительства и архитектуры». СПбГАСУ, 2024. http://dx.doi.org/10.23968/bimac.2024.010.
Testo completoAbstract (sommario):
В статье рассматриваются проблемы, связанные с переносом BIM-технологий в область разработки ландшафтных моделей (LIM-моделей). Проблемы демонстрируются на примере композиционных характеристик ландшафта. В качестве примера композиционных характеристик использована концепция визуально-пространственных единиц. Современные BIM-модели основаны на использовании наборов данных стандарта IFC. Сделан вывод, что Стандарт можно использовать при условии, что композиционные характеристики рассматриваются как функциональные характеристики набора данных IFC. Однако, алгоритм онлайн вычисления композиционных характеристик на сегодня неизвестен. Определение композиционных характеристик на сегодня возможно только после построения визуальной 3D-модели. В результате композиционная BIM-модель лишается преимуществ параметризации. Таковы проблемы переноса BIM-технологий в область архитектурно-ландшафтного проектирования.
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Lagarde, Quentin, Serge Mazen, Bruno Beillard, Julien Leylavergne, Joel Andrieu, Jean-Pierre Cancès, Vahid Meghdadi, Michelle Lalande, Edson Martinod e Marie-Sandrine Denis. "Étude et conception de système de management pour batteries innovantes, Batterie Sodium (NA-ion)". In Les journées de l'interdisciplinarité 2022. Limoges: Université de Limoges, 2022. http://dx.doi.org/10.25965/lji.581.
Testo completoAbstract (sommario):
La transition énergétique passera notamment par l’autoconsommation et l’autoproduction. L’utilisation de sources d’origines solaire et/ou éolienne permettront d’atteindre les objectifs bas carbone (atteindre la neutralité carbone à l’horizon 20250). Cette production étant intermittente, il est indispensable de les stocker pour pouvoir les utiliser au moment opportun. Actuellement la technologie dominante est l’accumulation d’énergie dans des batteries au lithium qui sont nuisibles à l’environnement et tributaires de la disponibilité au niveau mondial.De nouvelles batteries innovantes, comme celles au sodium-ion paraissent plus écologiques. Néanmoins, elles présentent l’inconvénient d’une durée de vie plus faible. L’utilisation d’un système de management de batterie (BMS – Battery Management System) l’améliore, les rendant ainsi concurrentielles aux batteries lithium-ion.
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Nguyen Chi, Hung, Akira Sone, Daisuke Iba e Arata Masuda. "Robust Design of Passive Suspension System of Half Railway Vehicles via Control Theory". In ASME 2008 Pressure Vessels and Piping Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/pvp2008-61060.
Testo completoAbstract (sommario):
This study deals with the robust design in designing passive suspension system of half railway vehicles via feedback control theory. This design with robustness performance is examined in the change of body weight corresponding to full and empty load of vehicle. These two states of system can be described by two sets of equations of motion that can be extended as one control object, and the controller designed by feedback control theory will control this extended model. By applying feedback control theory, parameter selection and optimization of a huge class of passive suspension system becomes a structural control problem. Since minimizing ℋ∞ norm of the system implies suppressing the peak of the magnitude of frequency response of the extended system, parameters selection of passive suspension systems becomes an ℋ∞ static output feedback problem, which turns into Bilinear Matrix Inequality (BMI) problem. One of simple methods to solve BMI problem is alternative algorithm which is derived from iterative schemes of alternation between analysis and synthesis via Linear Matrix Inequalities (LMIs). The effectiveness of vibration reduction is simulated by MATLAB software.
Rapporti di organizzazioni sul tema "LMI and BMI"
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Cvijić, Srdjan, Maja Bjeloš, Luka Šterić, Marko Drajić e Ivana Ranković. Balkanski čardaš: Ples mađarske spoljne politike. Beogradski centar za bezbednosnu politiku, maggio 2023. http://dx.doi.org/10.55042/gqaj4697.
Testo completoAbstract (sommario):
U sklopu sveukupnog bavljenja demokratskim nazadovanjem u Mađarskoj otkako je stranka Viktora Orbana, Fides, ponovo preuzela vlast 2010. godine, brojni međunarodni posmatrači izrazili su zabrinutost zbog povećanja uticaja Mađarske na Zapadnom Balkanu. Konkretno, mnogi strahuju da bi Orbanova Mađarska svojim pojačanim mešanjem u događaje na Zapadnom Balkanu mogla da proširi svoj neliberalni uticaj na čitav region, kako bi kasnije potkopala i širu politiku Evropske unije. Proces koji je doveo do imenovanja Olivera Varheljija (mađarskog diplomate bliskog Orbanu) na mesto Evropskog komesara za susedstvo i proširenje izazvao je 2019. godine salvu kritika. Iako je taj događaj nakratko privukao pažnju evropskih medija, pitanje mađarskog uticaja u regionu Zapadnog Balkana brzo je nestalo iz žiže javnosti. Osim nekoliko izuzetaka i par novinarskih napisa (koji će se u ovoj studiji obilato citirati), pokušaja da se analizira i objasni mađarska spoljna i trgovinska politika na Zapadnom Balkanu ima veoma malo. Ovaj rad je jedan od tek nekoliko sveobuhvatnih pokušaja da se objasne mađarska politika i njena uključenost u Zapadni Balkan, što ćemo nastojati da učinimo postavljanjem sledećih pitanja: Koji to interesi i strateška pitanja pokreću mađarsku spoljnu i trgovinsku politiku u regionu? Koji su prioriteti njene spoljne politike i koji instrumenti su joj na raspolaganju kada je u pitanju ovaj region? Da li Orbanovu politiku na Zapadnom Balkanu karakteriše potpuni diskontinuitet u odnosu na prethodnu mađarsku spoljnu politiku u regionu? Ko formuliše spoljnopolitičke prioritete u Mađarskoj i kakav je odnos između formalnih i neformalnih aktera u ovom procesu? Koji ekonomski interesi oblikuju mađarsku spoljnu politiku prema regionu? Koliko se mađarska spoljna politika u regionu promenila zbog rata u Ukrajini? Kako bi se odgovorilo na ova pitanja, rad je podeljen u četiri glavna dela. Prvi se bavi spoljnopolitičkom strategijom Mađarske u regionu. Drugi, u formi studije slučaja, istražuje efekte Orbanove politike prema manjinama u autonomnoj pokrajini Vojvodini (na mađarskom: Vajdaság). U trećem se istražuje mađarska regionalna medijska imperija, dok se četvrti fokusira na ekonomske pokretače mađarskog pristupa regionu.
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Travis, Amanda, Margaret Harvey e Michelle Rickard. Adverse Childhood Experiences and Urinary Incontinence in Elementary School Aged Children. University of Tennessee Health Science Center, ottobre 2021. http://dx.doi.org/10.21007/con.dnp.2021.0012.
Testo completoAbstract (sommario):
Purpose/Background: Adverse Childhood Experiences (ACEs) have an impact on health throughout the lifespan (Filletti et al., 1999; Hughes et al., 2017). These experiences range from physical and mental abuse, substance abuse in the home, parental separation or loss, financial instability, acute illness or injury, witnessing violence in the home or community, and incarceration of family members (Hughes et al., 2017). Understanding and screening for ACEs in children with urinary incontinence can help practitioners identify psychological stress as a potentially modifiable risk factor. Methods: A 5-month chart review was performed identifying English speaking patients ages 6-11 years presenting to the outpatient urology office for an initial visit with a primary diagnosis of urinary incontinence. Charts were reviewed for documentation of individual or family risk factors for ACEs exposure, community risk factors for ACEs exposures, and records where no related documentation was included. Results: For the thirty-nine patients identified, no community risk factors were noted in the charts. Seventy-nine percent of patients had one or more individual or family risk factors documented. Implications for Nursing Practice This chart review indicates that a significant percentage of pediatric, school-aged patients presenting with urinary incontinence have exposure to ACEs. A formal assessment for ACEs at the time of initial presentation would be helpful to identify those at highest risk. References: Felitti VJ, Anda RF, Nordenberg D, Williamson DF, Spitz AM, Edwards V, Koss MP, Marks JS. Relationship of childhood abuse and household dysfunction to many of the leading causes of death in adults: the adverse childhood experiences (ACE) study. Am J Prev Med. 1998;14:245–258 Hughes, K., Bellis, M.A., Hardcastle, K.A., Sethi, D., Butchart, D., Mikton, C., Jones, L., Dunne, M.P. (2017) The effect of multiple adverse childhood experiences on health: a systematic review and meta-analysis. Lancet Public Health, 2(8): e356–e366. Published online 2017 Jul 31.doi: 10.1016/S2468-2667(17)30118-4 Lai, H., Gardner, V., Vetter, J., & Andriole, G. L. (2015). Correlation between psychological stress levels and the severity of overactive bladder symptoms. BMC urology, 15, 14. doi:10.1186/s12894-015-0009-6