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Cristiane Aguiar da Costa,Dayane Teixeira Ognibene,Viviane Silva Cristino Cordeiro,Graziele Freitas de Bem,Izabelle Barcellos Santos,Ricardo Andrade Soares,Letı´cia L. de Melo Cunha,Lenize C. R.M. Car 한국식품영양과학회 2017 Journal of medicinal food Vol.20 No.10
Previously, we have demonstrated that the seeds of Euterpe oleracia Mart. (açaí) are rich in polyphenols with antihypertensive and antioxidant properties. This study evaluated the renal protective effects of the hydroalcoholic extract obtained from the seeds of açaí (ASE) fruits in two-kidney, one-clip (2K1C) renovascular hypertension. Young male Wistar rats were used to obtain 2K1C and sham groups. Animals received ASE (200 mg/(kg·day) in drinking water) or vehicle for 40 days. We evaluated serum and urinary parameters, renal structural changes, and oxidative status. The increase in systolic blood pressure of the 2K1C group was accompanied by a decrease in left kidney volume and number of glomeruli, as well as an increase in glomerular volume and collagen deposition. ASE prevented the alterations of these parameters, except the reduced kidney volume. Serum levels of urea and creatinine and urinary protein excretion were increased in the 2K1C group and treatment with ASE improved all these functional parameters. The increased oxidative damage in the 2K1C group, assessed by lipid and protein oxidation, was prevented by ASE. The nitrite content and both expression and activity of antioxidant enzymes (superoxide dismutase-1, catalase, and glutathione peroxidase) were lower in the 2K1C group and restored by ASE. ASE substantially reduced renal injury and prevented renal dysfunction in 2K1C rats probably through its antihypertensive and antioxidant effects, providing a natural resource for treatment and prevention of renovascular hypertension-related abnormalities.
G. C. Cordeiro,T. R. Barroso,R. D. Toledo Filho 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.4
In this study, the feasibility and effectiveness of a controlled laboratory re-calcination process was evaluated in order to mitigate thenegative effects of Sugar Cane Bagasse Ash (SCBA) with high carbon content on hydration and fresh properties of concrete. Measurements of particle size distribution, chemical composition, BET specifc surface area, and pozzolanic activity were realized tocharacterize the as-received and re-processed SCBA. Moreover, the distinct SCBAs were evaluated based on results of isothermalcalorimetry and time of setting by Vicat method in cement-SCBA pastes and compressive strength, Young’s modulus, and waterabsorption in a 35-MPa concrete. The results showed that the re-calcination process decreased the loss on ignition from 20.9% to2.1% at laboratory calcination thus increasing the silica content of the ash. Re-burnt SCBA provided the control of setting times andthe evolution of the compressive strength of concrete changed with the nature of the used ash with a superior behavior beingobserved for lab-conditioned re-calcination SCBA.
Detection and Diagnosis Solutions for Fault-Tolerant VSI
Cordeiro, Armando,Palma, Joao C.P.,Maia, Jose,Resende, Maia J. The Korean Institute of Power Electronics 2014 JOURNAL OF POWER ELECTRONICS Vol.14 No.6
This paper presents solutions for fault detection and diagnosis of two-level, three phase voltage-source inverter (VSI) topologies with IGBT devices. The proposed solutions combine redundant standby VSI structures and contactors (or relays) to improve the fault-tolerant capabilities of power electronics in applications with safety requirements. The suitable combination of these elements gives the inverter the ability to maintain energy processing in the occurrence of several failure modes, including short-circuit in IGBT devices, thus extending its reliability and availability. A survey of previously developed fault-tolerant VSI structures and several aspects of failure modes, detection and isolation mechanisms within VSI is first discussed. Hardware solutions for the protection of power semiconductors with fault detection and diagnosis mechanisms are then proposed to provide conditions to isolate and replace damaged power devices (or branches) in real time. Experimental results from a prototype are included to validate the proposed solutions.
Detection and Diagnosis Solutions for Fault-Tolerant VSI
Armando Cordeiro,Joao C. P. Palma,Jose Maia,Maia J. Resende 전력전자학회 2014 JOURNAL OF POWER ELECTRONICS Vol.14 No.6
This paper presents solutions for fault detection and diagnosis of two-level, three phase voltage-source inverter (VSI) topologies with IGBT devices. The proposed solutions combine redundant standby VSI structures and contactors (or relays) to improve the fault-tolerant capabilities of power electronics in applications with safety requirements. The suitable combination of these elements gives the inverter the ability to maintain energy processing in the occurrence of several failure modes, including short-circuit in IGBT devices, thus extending its reliability and availability. A survey of previously developed fault-tolerant VSI structures and several aspects of failure modes, detection and isolation mechanisms within VSI is first discussed. Hardware solutions for the protection of power semiconductors with fault detection and diagnosis mechanisms are then proposed to provide conditions to isolate and replace damaged power devices (or branches) in real time. Experimental results from a prototype are included to validate the proposed solutions.
The Marshall-Olkin generalized gamma distribution
Barriga, Gladys D.C.,Cordeiro, Gauss M.,Dey, Dipak K.,Cancho, Vicente G.,Louzada, Francisco,Suzuki, Adriano K. The Korean Statistical Society 2018 Communications for statistical applications and me Vol.25 No.3
Attempts have been made to define new classes of distributions that provide more flexibility for modelling skewed data in practice. In this work we define a new extension of the generalized gamma distribution (Stacy, The Annals of Mathematical Statistics, 33, 1187-1192, 1962) for Marshall-Olkin generalized gamma (MOGG) distribution, based on the generator pioneered by Marshall and Olkin (Biometrika, 84, 641-652, 1997). This new lifetime model is very flexible including twenty one special models. The main advantage of the new family relies on the fact that practitioners will have a quite flexible distribution to fit real data from several fields, such as engineering, hydrology and survival analysis. Further, we also define a MOGG mixture model, a modification of the MOGG distribution for analyzing lifetime data in presence of cure fraction. This proposed model can be seen as a model of competing causes, where the parameter associated with the Marshall-Olkin distribution controls the activation mechanism of the latent risks (Cooner et al., Statistical Methods in Medical Research, 15, 307-324, 2006). The asymptotic properties of the maximum likelihood estimation approach of the parameters of the model are evaluated by means of simulation studies. The proposed distribution is fitted to two real data sets, one arising from measuring the strength of fibers and the other on melanoma data.
Interference Mitigation Technique for the Sharing between IMT-Advanced and Fixed Satellite Service
J.-W. Lim,조한신,H.-G. Yoon,육종관,C. Cordeiro,D. P. Agrawal 한국통신학회 2007 Journal of communications and networks Vol.9 No.2
In this paper, we propose an efficient and robust interference mitigation technique based on a nullsteering multi-user multiple-input multiple-output (MU-MIMO) spatial division multiple access (SDMA) scheme for frequency sharing between IMT-advanced and fixed satellite service (FSS) in the 3400-4200 and 4500-4800 MHz bands. In the proposed scheme, the pre-existing preceding matrix for SDMA unitary preceded (UPC) MIMO proposed by the authors is modified to construct nulls in the spatial spectrum corresponding to the direction angles of the victim FSS earth station (ES). Furthermore, a numerical formula to calculate the power of the interference signal received at the FSS ES when IMT-Advanced base stations (BS) are operated with the interference mitigation technique is presented. This formula can be derived in closed form and is simply implemented with the help of simulation, resulting in significantly reduced time to obtain the solution. Finally, the frequency sharing results are analyzed in the co-channel and adjacent channel with respect to minimum separation distance and direction of FSS earth station (DOE). Simulation results indicate that the proposed mitigation scheme is highly efficient in terms of reducing the separation distance as well as robust against DOE estimation errors.