Documents disponibles écrits par cet auteur

Designing multiperson tournaments with asymmetric contestants / Hua Chen in Management science, Vol. 57 N° 5 (Mai 2011) 

Public ISBD [article]  in Management science > Vol. 57 N° 5 (Mai 2011) . - pp. 864-883 Titre : Designing multiperson tournaments with asymmetric contestants : An experimental study Type de document : texte imprimé Auteurs : Hua Chen, Auteur ; Sung H. Ham, Auteur ; Noah Lim, Auteur Année de publication : 2011 Article en page(s) : pp. 864-883 Note générale : Management Langues : Anglais (eng) Mots-clés : Tournaments  Compensation  Sales  management  Experimental  economics  Behavioral  economics Index. décimale : 658 Organisation des entreprises. Techniques du commerce Résumé : Is the right amount of effort exerted in multiperson tournaments where contestants have two different levels of initial endowments (termed "favorites" and "underdogs")? We develop theoretical predictions for the level of effort and the effect of varying the prize structure. We test these predictions for three-person tournaments using an economic experiment in a social environment where contest outcomes are publicly announced. We find that both favorites and underdogs overexert effort relative to the theoretical point predictions. Moreover, in the treatment with two favorites and one underdog, favorites increase their effort when the number of prizes is increased from one to two, contrary to the theory prediction. We show that a generalized model that allows for psychological losses from losing for favorites and psychological gains from winning for underdogs because of social comparisons tracks the experimental results better than the standard theoretical model. DEWEY : 658 ISSN : 0025-1909 En ligne : http://mansci.journal.informs.org/cgi/content/abstract/57/5/864 [article] Designing multiperson tournaments with asymmetric contestants : An experimental study [texte imprimé] / Hua Chen, Auteur ; Sung H. Ham, Auteur ; Noah Lim, Auteur . - 2011 . - pp. 864-883. Management Langues : Anglais (eng) in Management science > Vol. 57 N° 5 (Mai 2011) . - pp. 864-883 Mots-clés : Tournaments  Compensation  Sales  management  Experimental  economics  Behavioral  economics Index. décimale : 658 Organisation des entreprises. Techniques du commerce Résumé : Is the right amount of effort exerted in multiperson tournaments where contestants have two different levels of initial endowments (termed "favorites" and "underdogs")? We develop theoretical predictions for the level of effort and the effect of varying the prize structure. We test these predictions for three-person tournaments using an economic experiment in a social environment where contest outcomes are publicly announced. We find that both favorites and underdogs overexert effort relative to the theoretical point predictions. Moreover, in the treatment with two favorites and one underdog, favorites increase their effort when the number of prizes is increased from one to two, contrary to the theory prediction. We show that a generalized model that allows for psychological losses from losing for favorites and psychological gains from winning for underdogs because of social comparisons tracks the experimental results better than the standard theoretical model. DEWEY : 658 ISSN : 0025-1909 En ligne : http://mansci.journal.informs.org/cgi/content/abstract/57/5/864

Experimental observation of inertia-dominated squeeze film damping in liquid / Antoine Fornari in Transactions of the ASME . Journal of fluids engineering, Vol. 132 N° 12 (Décembre 2010) 

Public ISBD [article]  in Transactions of the ASME . Journal of fluids engineering > Vol. 132 N° 12 (Décembre 2010) . - 10 p. Titre : Experimental observation of inertia-dominated squeeze film damping in liquid Type de document : texte imprimé Auteurs : Antoine Fornari, Auteur ; Matthew Sullivan, Auteur ; Hua Chen, Auteur Année de publication : 2011 Article en page(s) : 10 p. Note générale : fluids engineering Langues : Anglais (eng) Mots-clés : damping;  drag;  liquid  films;  lubrication;  microfluidics;  microsensors;  plates  (structures);  vibrations;  viscosity Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : We have studied the phenomenon of squeeze film damping in a liquid with a microfabricated vibrating plate oscillating in its fundamental mode with out-of-plane motion. It is paramount that this phenomenon be understood so that proper choices can be made in terms of sensor design and packaging. The influences of plate-wall distance h, effective plate radius R, and fluid viscosity and density on squeeze film damping have been studied. We experimentally observe that the drag force is inertia dominated and scales as 1/h3 even when the plate is far away from the wall, a surprising but understandable result for a microfluidic device where the ratio of h to the viscous penetration depth is large. We observe as well that the drag force scales as R3, which is inconsistent with squeeze film damping in the lubrication limit. These two cubic power laws arise due to the role of inertia in the high frequency limit. DEWEY : 620.1 ISSN : 0098-2202 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JFEGA4000132000012 [...] [article] Experimental observation of inertia-dominated squeeze film damping in liquid [texte imprimé] / Antoine Fornari, Auteur ; Matthew Sullivan, Auteur ; Hua Chen, Auteur . - 2011 . - 10 p. fluids engineering Langues : Anglais (eng) in Transactions of the ASME . Journal of fluids engineering > Vol. 132 N° 12 (Décembre 2010) . - 10 p. Mots-clés : damping;  drag;  liquid  films;  lubrication;  microfluidics;  microsensors;  plates  (structures);  vibrations;  viscosity Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : We have studied the phenomenon of squeeze film damping in a liquid with a microfabricated vibrating plate oscillating in its fundamental mode with out-of-plane motion. It is paramount that this phenomenon be understood so that proper choices can be made in terms of sensor design and packaging. The influences of plate-wall distance h, effective plate radius R, and fluid viscosity and density on squeeze film damping have been studied. We experimentally observe that the drag force is inertia dominated and scales as 1/h3 even when the plate is far away from the wall, a surprising but understandable result for a microfluidic device where the ratio of h to the viscous penetration depth is large. We observe as well that the drag force scales as R3, which is inconsistent with squeeze film damping in the lubrication limit. These two cubic power laws arise due to the role of inertia in the high frequency limit. DEWEY : 620.1 ISSN : 0098-2202 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JFEGA4000132000012 [...]

Semiglobal stabilization for nonholonomic mobile robots based on dynamic feedback with inputs saturation / Hua Chen in Transactions of the ASME . Journal of dynamic systems, measurement, and control, Vol. 134 N° 4 (Juillet 2012) 

Public ISBD [article]  in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 134 N° 4 (Juillet 2012) . - 08 p. Titre : Semiglobal stabilization for nonholonomic mobile robots based on dynamic feedback with inputs saturation Type de document : texte imprimé Auteurs : Hua Chen, Auteur ; Chaoli Wang, Auteur ; Liu Yang, Auteur Année de publication : 2012 Article en page(s) : 08 p. Note générale : Dynamic systems Langues : Anglais (eng) Mots-clés : Nanholonomic  mobile  robots  Dynamic  feedback  Semiglobal  stabilization  Inputs  saturation Index. décimale : 629.8 Résumé : This paper investigates the semiglobal stabilization problem for nonholonomic mobile robots based on dynamic feedback with inputs saturation. A bounded, continuous, time-varying controller is presented such that the closed-loop system is semiglobally asymptotically stable. The systematic strategy combines finite-time control technique with the virtual-controller-tracked method, which is similar to the back-stepping procedure. First, the bound-constrained smooth controller is presented for the kinematic model. Second, the dynamic feedback controller is designed to make the generalized velocity converge to the prespecified kinematic (virtual) controller in a finite time. Furthermore, the rigorous proof is given for the stability analysis of the closed-loop system. In the mean time, the position and torque inputs of robots are proved to be bounded at any time. Finally, the simulation results show the effectiveness of the proposed control approach. DEWEY : 629.8 ISSN : 0022-0434 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JDSMAA000134000004 [...] [article] Semiglobal stabilization for nonholonomic mobile robots based on dynamic feedback with inputs saturation [texte imprimé] / Hua Chen, Auteur ; Chaoli Wang, Auteur ; Liu Yang, Auteur . - 2012 . - 08 p. Dynamic systems Langues : Anglais (eng) in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 134 N° 4 (Juillet 2012) . - 08 p. Mots-clés : Nanholonomic  mobile  robots  Dynamic  feedback  Semiglobal  stabilization  Inputs  saturation Index. décimale : 629.8 Résumé : This paper investigates the semiglobal stabilization problem for nonholonomic mobile robots based on dynamic feedback with inputs saturation. A bounded, continuous, time-varying controller is presented such that the closed-loop system is semiglobally asymptotically stable. The systematic strategy combines finite-time control technique with the virtual-controller-tracked method, which is similar to the back-stepping procedure. First, the bound-constrained smooth controller is presented for the kinematic model. Second, the dynamic feedback controller is designed to make the generalized velocity converge to the prespecified kinematic (virtual) controller in a finite time. Furthermore, the rigorous proof is given for the stability analysis of the closed-loop system. In the mean time, the position and torque inputs of robots are proved to be bounded at any time. Finally, the simulation results show the effectiveness of the proposed control approach. DEWEY : 629.8 ISSN : 0022-0434 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JDSMAA000134000004 [...]