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- 저자 : Giunta, C. (검색결과 15 건)
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Giunta, Gaetano,Belouettar, Salim,Biscani, Fabio,Carrera, Erasmo Techno-Press 2014 Advances in aircraft and spacecraft science Vol.1 No.3
A linearised buckling analysis of thin-walled beams is addressed in this paper. Beam theories formulated according to a unified approach are presented. The displacement unknown variables on the cross-section of the beam are approximated via Mac Laurin's polynomials. The governing differential equations and the boundary conditions are derived in terms of a fundamental nucleo that does not depend upon the expansion order. Classical beam theories such as Euler-Bernoulli's and Timoshenko's can be retrieved as particular cases. Slender and deep beams are investigated. Flexural, torsional and mixed buckling modes are considered. Results are assessed toward three-dimensional finite element solutions. The numerical investigations show that classical and lower-order theories are accurate for flexural buckling modes of slender beams only. When deep beams or torsional buckling modes are considered, higher-order theories are required.
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A dynamic analysis of three-dimensional functionally graded beams by hierarchical models
Giunta, Gaetano,Koutsawa, Yao,Belouettar, Salim,Calvi, Adriano Techno-Press 2014 Smart Structures and Systems, An International Jou Vol.13 No.4
This paper presents a dynamic analysis of three-dimensional beams. Structures made of functionally graded materials are considered. Several higher-order as well as classical theories are derived by means of a compact notation for the a-priori expansion order of the displacement field over the beam cross-section. The governing differential equations and boundary conditions are obtained in a condensed nuclear form that does not depend on the kinematic hypotheses. The problem is, then, exactly solved in space by means of a Navier-type solution, whereas time integration is performed by means of Newmark's solution scheme. Slender and short simply supported beams are investigated. Results are validated towards three-dimensional FEM results obtained via the commercial software ANSYS. Numerical investigations show that good accuracy can be obtained through the proposed formulation provided that the appropriate expansion order is considered.
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A dynamic analysis of three-dimensional functionally graded beams by hierarchical models
Gaetano Giunta,Yao Koutsawa,Salim Belouettar,Adriano Calvi 국제구조공학회 2014 Smart Structures and Systems, An International Jou Vol.13 No.4
This paper presents a dynamic analysis of three-dimensional beams. Structures made of functionally graded materials are considered. Several higher-order as well as classical theories are derived by means of a compact notation for the a-priori expansion order of the displacement field over the beam cross-section. The governing differential equations and boundary conditions are obtained in a condensed nuclear form that does not depend on the kinematic hypotheses. The problem is, then, exactly solved in space by means of a Navier-type solution, whereas time integration is performed by means of Newmark\'s solution scheme. Slender and short simply supported beams are investigated. Results are validated towards three-dimensional FEM results obtained via the commercial software ANSYS. Numerical investigations show that good accuracy can be obtained through the proposed formulation provided that the appropriate expansion order is considered.
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( Javier Nicolas Giunta ),( Daniel Liarte ),( Bruno Rafael Boietti ),( Francisco Carlos Bonofiglio ),( Cristina Maria Elizondo ),( Luis Grosembacher ),( Leon Efrain Litwak ),( Gabriel Dario Waisman ) 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1
Background: It is unknown if values of glycosylated hemoglobin (HbA1c) could predict complications in the immediate postoperative period in diabetic patients. Objective: To compare the incidence of immediate postoperative complications in diabetic patients with controlled (GC) vs. uncontrolled (GUC) HbA1c. Methods: Prospective cohort of type 2 diabetic patients, divided in 2 groups: GC (HbA1c = 7%) and GUC (HbA1c> 7%), followed for 30 days after major elective surgery, through 2012-2013. Considered complications were: readmissions, infections, cardiovascular events, stroke, and mortality. Results: 163 patients were enrolled: 75.5% (123) for GC and 24.5% (40) for GUC. Mean age was 66 years (SD:10) for GC, and 62 years (SD:13) for GUC. 54% and 60% were male for GC and GUC respectively. For GC, main surgeries were: urologic (23,6%); traumatologic (21,9%) and biliar (11.4%); for GUC main surgeries were: traumatologic (25%), urologic (22.5%) and bariatric (17.5%). Variables with no statistically significant differences between groups were: gender (p=0.48), age (p=0.06), Charlson co-morbidity score (p=0.69), BMI (p=0.33), current smoker (p=0.85) or ex-smoker (p=0.18), physical activity (p=0.97), hypertension (p=0.09), dyslipidemia (p=0.34), chronic renal failure (p=0.96), neoplasms (p=0.7), diabetic nephropathy (p=0,84), retinopathy (p=0.09), neuropathy (p=0.22) or peripheral vascular disease (p=0,82). Statistically significant difference was found for coronary disease, 31% vs. 15% (p=0.049), for GC and GUC respectively. The incidence for immediate postoperative complications in GC was 11.4% (14): 9 infections, 8 were readmitted and one cardiovascular event. In GUC, complication incidence was 17.5% (7): 4 infections, 4 readmissions, 1 stroke and 2 deaths. Crude HR control for complications was 0.65% (95%,CI:0,26-1.6, p=0,35). Discussion: Although we did not find a significant incidence of postoperative complications between controlled and uncontrolled groups, the uncontrolled group had more postoperative complications and survival curves were different, although without statistical significance.
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( Diego Hernan Giunta ),( Analia Judith Baum ),( Bruno Rafael Boietti ),( Nora Angelicafuentes ),( Carolina Gabay ),( Fernan Gonzalez Bernaldo De Quiros ),( Maria Florencia Grande Ratti ),( Daniel Rob 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1
Introduction: Nonattendance to scheduled outpatient appointments (SOA) produces ineffi ciency and discontinuity in care, although associated impact on mortality is unknown. Objetive: Evaluate association between SOA in primary care with emergency assessments (EA), emergency hospitalization (EH) and mortality (M) throughout a year. Methods: Retrospective cohort of adults affi liated to Hospital Italiano, with at least one SOA during 2012. We included all patients beginning from the last SOA of 2012 and followed them throughout a year, describing the events of EA, EH and M. We measured the number of SOA and the nonattendance proportion at the previous year before inclusion to the cohort. We used a Cox proportional hazards regression model, to estimate crude and adjusted Hazard Ratios (HR) and 95% confi dence interval. Results: 117327 patients were included, with a median age of 59 years (IQR:34), with a female frequency of 63. 3% (74300). Median of SOA was 8 appointments (IQR 9), the median of the nonattendance proportion of each patient was 28. 6% (IQR 39). 26% of patients had a proportion of nonattendance of 50% or more. EA was 13. 5% (15858); EH was of 3% (3551); and mortality was 1. 6% (1853) during follow up. Crude HR for each 10% increase in nonattendance proportion was 1. 031 (95%, IC:1. 025- 1. 037, p<0, 001) for EA; 1, 012 (95%, IC:1-1. 025, p=0. 051) for EH; and 1. 028 (95%, IC:1. 011-1, 045, p<0, 001) for M. Adjusted HR (by sex, age, diabetes, hypertension, cancer and coronary disease) for each 10% increment in nonattendance proportion was 1. 010 (95%, IC:1. 004-1. 017, p<0, 001);1. 099 (95%, IC:1. 084-1. 113, p<0, 001); and 1. 125 (IC95% 1, 105-1, 145, p<0, 001) for EA, EF and M respectively. Conclusions: Even though the nonattendance proportion effect on EA, EH and M is moderate, it could be relevant as a prognostic factor in high risk patients subgroups.
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Koutsawa, Yao,Tiem, Sonnou,Giunta, Gaetano,Belouettar, Salim Techno-Press 2014 Smart Structures and Systems, An International Jou Vol.13 No.4
This paper presents a linear computational homogenization framework to evaluate the effective (or generalized) electromechanical coupling coefficient (EMCC) of adaptive structures with piezoelectric structural fiber (PSF) composite elements. The PSF consists of a silicon carbide (SiC) or carbon core fiber as reinforcement to a fragile piezo-ceramic shell. For the micro-scale analysis, a micromechanics model based on the variational asymptotic method for unit cell homogenization (VAMUCH) is used to evaluate the overall electromechanical properties of the PSF composites. At the macro-scale, a finite element (FE) analysis with the commercial FE code ABAQUS is performed to evaluate the effective EMCC for structures with the PSF composite patches. The EMCC is postprocessed from free-vibrations analysis under short-circuit (SC) and open-circuit (OC) electrodes of the patches. This linear two-scale computational framework may be useful for the optimal design of active structure multi-functional composites which can be used for multi-functional applications such as structural health monitoring, power harvest, vibration sensing and control, damping, and shape control through anisotropic actuation.
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Yao Koutsawa,Sonnou Tiem,Gaetano Giunta,Salim Belouettar 국제구조공학회 2014 Smart Structures and Systems, An International Jou Vol.13 No.4
This paper presents a linear computational homogenization framework to evaluate the effective (or generalized) electromechanical coupling coefficient (EMCC) of adaptive structures with piezoelectric structural fiber (PSF) composite elements. The PSF consists of a silicon carbide (SiC) or carbon core fiber as reinforcement to a fragile piezo-ceramic shell. For the micro-scale analysis, a micromechanics model based on the variational asymptotic method for unit cell homogenization (VAMUCH) is used to evaluate the overall electromechanical properties of the PSF composites. At the macro-scale, a finite element (FE) analysis with the commercial FE code ABAQUS is performed to evaluate the effective EMCC for structures with the PSF composite patches. The EMCC is postprocessed from free-vibrations analysis under short-circuit (SC) and open-circuit (OC) electrodes of the patches. This linear two-scale computational framework may be useful for the optimal design of active structure multi-functional composites which can be used for multi-functional applications such as structural health monitoring, power harvest, vibration sensing and control, damping, and shape control through anisotropic actuation.
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( Nora Angelica Fuentes ),( Diego Hernan Giunta ),( Cristina Maria Elizondo ),( Fernan Gonzalez Bernaldo De Quiros ),( Gabriel Dario Waisman ),( Juan Carlos Ayus ) 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1
Background: Hip Fracture (HF) is a leading cause of morbidity and mortality in elderly. Related complications are cardiovascular (CVD), sepsis and venous thromboembolism (VTE), deep venous thrombosis (DVT) and pulmonary embolism (PE). In recent studies, chronic hyponatremia was observed to be an independent risk factor for hip fracture, nevertheless there is no evidence on prognosis of these patients compared to patients without hyponatremia. Objective: To compare the prognosis and complications of HF in normonatremic patients (N) and hyponatremic patients (H). Methods: Retrospective cohort of hospitalized patients with HF, followed up to 30 days after diagnosis, at Hospital Italiano of Buenos Aires. Presence of complications (sepsis, DVT, PE, and CVD), hospital length of stay, mortality and readmission were evaluated. Results: 1571 patients were included, 76, 7% (1205) for N and 23, 3% (366) for H. Most patients were female, 82. 5% and 79. 8% for H and N respectively. H were older, 85 vs. 82 years (p<0. 001). Sepsis was the most frequent complication for H (OR 1. 7, 95% CI: 1. 13-2. 6). Length of stay was 7 days vs. 8 days (p=0. 053) for N and H. Readmissions were 12. 9% for N vs. 15. 8% for H (p=0. 14). Hospital mortality was minor for N than for H (14. 7% vs. 19. 9%; p=0. 016), crude OR was 1. 45 (1. 07-1. 96) and adjusted OR was 1. 15 (0. 84-1. 6). Survival was higher for N than for H (p<0. 001). Crude hazard ratio (HR) of death for H compared to N was 1. 8 (1. 4-2. 35) and adjusted HR was 1. 45 (1. 1-1. 9). Conclusions: Hyponatremic patients have higher risk of sepsis, hospital length of stay and mortality. Thus hyponatremia could represent a marker of severity of underlying diseases or be a consequence of treatments during the surgical procedures, it could serve as alert for potential risk on outcome of these patients.
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In vivo tracking of adipose tissue grafts with cadmium-telluride quantum dots
Deglmann, Claus J.,Blazkow-Schmalzbauer, Katarzyna,Moorkamp, Sarah,Wallmichrath, Jens,Giunta, Riccardo E.,Rogach, Andrey L.,Wagner, Ernst,Baumeister, Ruediger G.,Ogris, Manfred Korean Society of Plastic and Reconstructive Surge 2018 Archives of Plastic Surgery Vol.45 No.2
Background Fat grafting, or lipofilling, represent frequent clinically used entities. The fate of these transplants is still not predictable, whereas only few animal models are available for further research. Quantum dots (QDs) are semiconductor nanocrystals which can be conveniently tracked in vivo due to photoluminescence. Methods Fat grafts in cluster form were labeled with cadmium-telluride (CdTe)-QD 770 and transplanted subcutaneously in a murine in vivo model. Photoluminescence levels were serially followed in vivo. Results Tracing of fat grafts was possible for 50 days with CdTe-QD 770. The remaining photoluminescence was $4.9%{\pm}2.5%$ for the QDs marked fat grafts after 30 days and $4.2%{\pm}1.7%$ after 50 days. There was no significant correlation in the relative course of the tracking signal, when vital fat transplants were compared to non-vital graft controls. Conclusions For the first-time fat grafts were tracked in vivo with CdTe-QDs. CdTe-QDs could offer a new option for in vivo tracking of fat grafts for at least 50 days, but do not document vitality of the grafts.
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( Cristina Maria Elizondo ),( Carla Scarano ),( Constanza Franceschini ),( Nora Angelica Fuentes ),( Hernan Diego Giunta ),( Liliana Rojas ),( Marcelo Martin Serra ) 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1
Background: Hereditary hemorrhagic telangiectasia (HHT) is an autosomal dominant systemic disorder that affects 1/5000-8000 individuals worldwide. It is characterized by recurrent epistaxis, mucocutaneous telangiectasias and arteriovenous malformations (AVMs) in organs such as lung, liver, central nervous system (CNS) and gastrointestinal tract (GI); their clinical manifestations and possible complications added, frequently alters quality of life of these patients. Objective: To identify associated factors with lower quality of life in adult patients with HHT. Methods: Cross-sectional study, from 2010 to 2013, of prospectively evaluated patients, from the institutional registry of HHT at Hospital Italiano, Buenos Aires. Quality of life (QoL) was measured with the EuroQol and visual analog scale (AVS) validated for the country. Presence of epistaxis, anemia, AVMs in CNS, lung, liver, GI tract, symptoms and related complications were evaluated. Results: 127 patients were included: 33% were men, with a median age of 47 years (IQR:16). Median for QoL measured by the VAS was 69 (ICR:20.3). From the total, 96,1% presented epistaxis, from which 33,9% had severe epistaxis; 60% had anemia, 65,15% pulmonary AVMs, 39,4% were symptomatic; 19,6% had AVMs in CNS; 73,5% had hepatic AVMs and 63% had GI AVMs from which 27,6% presented symptoms. Signifi cant association was found between de median of QoL measured by VAS with: anemia (62 vs. non-anemic 77.8, p=0.001), pulmonary AVMs (62.3 vs. 71.27 without pulmonary AVMs, p=0.056), hepatic AVMs (64.67 vs. 78.15 without AVMs, p=0.012), GI AVMs (60 vs. 70 without AVMs, p=0.043) and correlation coefficient age was -0.349 age (p<0.001). Conclusions: Factors associated to decrease QoL in HHT were anemia and hepatic, pulmonary and GI AVMs. There was no difference in QoL related to epistaxis, but this could be attributed to the low number of patients without epistaxis.
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