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A polynomial chaos method to the analysis of the dynamic behavior of spur gear system
Guerine, A.,El Hami, A.,Fakhfakh, T.,Haddar, M. Techno-Press 2015 Structural Engineering and Mechanics, An Int'l Jou Vol.53 No.4
In this paper, we propose a new method for taking into account uncertainties based on the projection on polynomial chaos. The new approach is used to determine the dynamic response of a spur gear system with uncertainty associated to gear system parameters and this uncertainty must be considered in the analysis of the dynamic behavior of this system. The simulation results are obtained by the polynomial chaos approach for dynamic analysis under uncertainty. The proposed method is an efficient probabilistic tool for uncertainty propagation. It was found to be an interesting alternative to the parametric studies. The polynomial chaos results are compared with Monte Carlo simulations.
Guerin-Deremaux, Laetitia,Ringard, Florence,Desailly, Fabrice,Wils, Daniel The Korean Nutrition Society 2010 Nutrition Research and Practice Vol. No.
The resistant dextrin NUTRIOSE$^{(R)}$, developed from starch, is expected to act as a prebiotic. The aim of this study was to determine the effects of NUTRIOSE$^{(R)}$ on cecal parameters, short-chain fatty acid (SCFA) concentrations, and fecal excretion in rats. In an initial experiment, twenty-four male Fischer F344 rats were randomly assigned to one of the following four treatments for 14 days: G0 (control diet), G2.5 (control diet+2.5% of dextrin), G5 (control diet + 5% of dextrin), and G10 (control diet + 10% of dextrin). After 14 days, total cecal weight, cecal content, and cecal wall weight were significantly increased in G5 and G10 compared to G0. At the same time, cecal pH was significantly lower in G10 compared to G0. Total SCFA concentration was significantly higher in G10 than in G5, G2.5, and G0, and significantly higher in G5 than in G0. Acetate, butyrate, and propionate concentrations were significantly increased in G5 and G10 compared to the controls. In a second trial based on a similar design, eighteen male Fischer F344 rats were treated with a control diet supplemented with 5% of dextrin or 5% of fructo-oligosaccharide. The results obtained with NUTRIOSE$^{(R)}$ were similar to those obtained with the fructo-oligosaccharide. In a third experiment, two groups of 5 Fischer F344 rats were orally treated with 100 and 1,000 mg/kg NUTRIOSE$^{(R)}$, respectively, and from 18% to 25% of the dextrin was excreted in the feces. The results of these three studies show that the consumption of NUTRIOSE$^{(R)}$, by its effects on total cecal weight, cecal content, cecal wall weight, pH, and SCFA production, could induce healthy benefits since these effects are reported to be prebiotic effects.
IS SEAPORT MANAGEMENT THE FUTURE OF INTERNATIONAL SUPPLY CHAIN PERFORMANCE?
Frank Guerin,Romain Lambert 인하대학교 정석물류통상연구원 2008 인하대학교 정석물류통상연구원 학술대회 Vol.2008 No.3
Practitioners and academics all need an integrated view of the way a finished good is managed from point to point of the chain. Then, global and integrated analyses of supply chains, throughout particular cases are necessary to increase our knowledge. The starting point of our research project was to expertise a complete international supply chain in order to underline the key factors and the opportunities of performance improvement. The main result ofthis research program was to underline that: ㆍ SCM is, in the real economic life, a quite classical concept which is not very different from the M. Porter’s framework; ㆍ the only chance to invent the future is to change the way of thinking from a firm-centric to a process-centric vision (concept of supra chain management); ㆍ to properly practice Supra Chain Management, one must stand outside of pre-existing organizations; ㆍ not so far, from utopia and under new governance conditions, ports could play the role of 《visible inter-firms hand》 and become the key actor of the international supply chain performance improvement.
Laetitia Guerin-Deremaux,Florence Ringard,Fabrice Desailly,Daniel Wils 한국영양학회 2010 Nutrition Research and Practice Vol.4 No.6
The resistant dextrin NUTRIOSE<SUP>®</SUP>, developed from starch, is expected to act as a prebiotic. The aim of this study was to determine the effects of NUTRIOSE<SUP>®</SUP> on cecal parameters, short-chain fatty acid (SCFA) concentrations, and fecal excretion in rats. In an initial experiment, twenty-four male Fischer F344 rats were randomly assigned to one of the following four treatments for 14 days: G0 (control diet), G2.5 (control diet + 2.5% of dextrin), G5 (control diet + 5% of dextrin), and G10 (control diet + 10% of dextrin). After 14 days, total cecal weight, cecal content, and cecal wall weight were significantly increased in G5 and G10 compared to G0. At the same time, cecal pH was significantly lower in G10 compared to G0. Total SCFA concentration was significantly higher in G10 than in G5, G2.5, and G0, and significantly higher in G5 than in G0. Acetate, butyrate, and propionate concentrations were significantly increased in G5 and G10 compared to the controls. In a second trial based on a similar design, eighteen male Fischer F344 rats were treated with a control diet supplemented with 5% of dextrin or 5% of fructo-oligosaccharide. The results obtained with NUTRIOSE<SUP>®</SUP> were similar to those obtained with the fructo-oligosaccharide. In a third experiment, two groups of 5 Fischer F344 rats were orally treated with 100 and 1,000 ㎎/㎏ NUTRIOSE<SUP>®</SUP>, respectively, and from 18% to 25% of the dextrin was excreted in the feces. The results of these three studies show that the consumption of NUTRIOSE<SUP>®</SUP>, by its effects on total cecal weight, cecal content, cecal wall weight, pH, and SCFA production, could induce healthy benefits since these effects are reported to be prebiotic effects.
A polynomial chaos method to the analysis of the dynamic behavior of spur gear system
A. Guerine,A. El Hami,T. Fakhfakh,M. Haddar 국제구조공학회 2015 Structural Engineering and Mechanics, An Int'l Jou Vol.53 No.4
In this paper, we propose a new method for taking into account uncertainties based on the projection on polynomial chaos. The new approach is used to determine the dynamic response of a spur gear system with uncertainty associated to gear system parameters and this uncertainty must be considered in the analysis of the dynamic behavior of this system. The simulation results are obtained by the polynomial chaos approach for dynamic analysis under uncertainty. The proposed method is an efficient probabilistic tool for uncertainty propagation. It was found to be an interesting alternative to the parametric studies. The polynomial chaos results are compared with Monte Carlo simulations.
Dynamic behavior of the one-stage gear system with uncertainties
M. Beyaoui,A. Guerine,L. Walha,A. El Hami,T. Fakhfakh,M. Haddar 국제구조공학회 2016 Structural Engineering and Mechanics, An Int'l Jou Vol.58 No.3
In this paper, we propose a method for taking into account uncertainties based on the projection on polynomial chaos. Due to the manufacturing and assembly errors, uncertainties in material and geometric properties, the system parameters including assembly defect, damping coefficients, bending stiffness and traction-compression stiffness are uncertain. The proposed method is used to determine the dynamic response of a one-stage spur gear system with uncertainty associated to gear system parameters. An analysis of the effect of these parameters on the one stage gear system dynamic behavior is then treated. The simulation results are obtained by the polynomial chaos method for dynamic analysis under uncertainty. The proposed method is an efficient probabilistic tool for uncertainty propagation. The polynomial chaos results are compared with Monte Carlo simulations.
Sophie Hidalgo-Lucas,Pascale Rozan,Laetitia Guerin-Deremaux,Blandine Baert,Nicolas Violle,Marie-Helene Saniez-Degrave,Jean-Francois Bisson 한국식품영양과학회 2016 Journal of medicinal food Vol.19 No.5
Chlorella sp. is a green microalgae containing nutrients, vitamins, minerals, and chlorophyll. In some communities, Chlorella sp. is a traditional medicinal plant used for the management of inflammation-related diseases. In a rat model, ROQUETTE Chlorella sp. (RCs) benefits were investigated on visceral pain and associated inflammatory parameters related to cystitis both induced by cyclophosphamide (CYP). RCs was orally administered every day from day 1–16 (250 and 500 mg/kg body weight). Six hours after an intraperitoneal injection of 200 mg/kg body weight of CYP, body temperature, general behavior, food intake, and body weight were recorded. Twenty-four hours after CYP injection, rats were tested in two behavioral tests, an open field and the aversive light stimulus avoidance conditioning test, to evaluate the influence of pain on general activity and learning ability of rats. After euthanasia, bladders were weighed, their thickness was scored, and the urinary hemoglobin was measured. RCs orally administered at the two dosages significantly reduced visceral pain and associated inflammatory parameters related to cystitis both induced by CYP injection, and improved rat behavior. To conclude, RCs demonstrated beneficial effects against visceral pain and cystitis.