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Some Remarks on the Fragility of Smith Predictors used in Haptics
Bogdan Liacu,Irinel-Constantin Mor?rescu,Claude Andriot,Silviu-Iulian Niculescu,Didier Dumur,Patrick Boucher,Frederic Colledani 제어로봇시스템학회 2011 제어로봇시스템학회 국제학술대회 논문집 Vol.2011 No.10
In this paper, we propose a method to study the fragility of Smith predictor-based controllers used in haptics. Using a geometric approach, we derive a simple approach to examine the fragility of Smith predictors for two cases - constant and uncertain delays. Illustrative examples complete the presentation.
Jamel El-Benna,Pham My-Chan Dang,Marie-Anne Gougerot-Pocidalo,Jean-Claude Marie,Françoise Braut-Boucher 생화학분자생물학회 2009 Experimental and molecular medicine Vol.41 No.4
Phagocytes such as neutrophils play a vital role in host defense against microbial pathogens. The anti-microbial function of neutrophils is based on the production of superoxide anion (O2 -), which generates other microbicidal reactive oxygen species (ROS) and release of antimicrobial peptides and proteins. The enzyme responsible for O2 - production is called the NADPH oxidase or respiratory burst oxidase. This multicomponent enzyme system is composed of two transmembrane proteins (p22phox and gp91phox, also called NOX2, which together form the cytochrome b558) and four cytosolic proteins (p47phox, p67phox, p40phox and a GTPase Rac1 or Rac2), which assemble at membrane sites upon cell activation. NADPH oxidase activation in phagocytes can be induced by a large number of soluble and particulate agents. This process is dependent on the phosphorylation of the cytosolic protein p47phox. p47phox is a 390 amino acids protein with several functional domains: one phox homology (PX) domain, two src homology 3 (SH3) domains, an auto-inhibitory region (AIR), a proline rich domain (PRR) and has several phosphorylated sites located between Ser303 and Ser379. In this review, we will describe the structure of p47phox, its phosphorylation and discuss how these events regulate NADPH oxidase activation. Phagocytes such as neutrophils play a vital role in host defense against microbial pathogens. The anti-microbial function of neutrophils is based on the production of superoxide anion (O2 -), which generates other microbicidal reactive oxygen species (ROS) and release of antimicrobial peptides and proteins. The enzyme responsible for O2 - production is called the NADPH oxidase or respiratory burst oxidase. This multicomponent enzyme system is composed of two transmembrane proteins (p22phox and gp91phox, also called NOX2, which together form the cytochrome b558) and four cytosolic proteins (p47phox, p67phox, p40phox and a GTPase Rac1 or Rac2), which assemble at membrane sites upon cell activation. NADPH oxidase activation in phagocytes can be induced by a large number of soluble and particulate agents. This process is dependent on the phosphorylation of the cytosolic protein p47phox. p47phox is a 390 amino acids protein with several functional domains: one phox homology (PX) domain, two src homology 3 (SH3) domains, an auto-inhibitory region (AIR), a proline rich domain (PRR) and has several phosphorylated sites located between Ser303 and Ser379. In this review, we will describe the structure of p47phox, its phosphorylation and discuss how these events regulate NADPH oxidase activation.
Proportional-Derivative (PD) Controllers for Haptics subject to Distributed Time-Delays
Bogdan Liacu,Irinel-Constantin Mor?rescu,Silviu-Iulian Niculescu,Claude Andriot,Didier Dumur,Patrick Boucher,Frederic Colledani 제어로봇시스템학회 2012 제어로봇시스템학회 국제학술대회 논문집 Vol.2012 No.10
This paper focuses on the stability analysis of Proportional-Derivative (PD) controllers for Multi-Input-Multi-Output (MIMO) systems affected by distributed time-delays. The time-delays will be approximated by the most common distributions (uniform and gamma with gap distributions). In order to provide practical guidelines for the design of PD controllers we describe the stability regions in the gains-parameter space using a geometric approach. Illustrative examples complete the presentation.