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Evaluation of gas path analysis methods for gas turbine diagnosis
A. G. Stamatis 대한기계학회 2011 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.25 No.2
In the present paper, limitations concerning three implementations of gas path analysis (GPA) methods are investigated and their diagnostic effectiveness is evaluated. The methods were tested for different sets of faults on a twin shaft gas turbine with an instrumentation set typical of today’s engines. Test results revealed that classical GPA is not sufficient. Correct diagnosis is provided only when one already knows a subset of components containing the fault; otherwise, the fault may be attributed to other component (s). The effectiveness of a second method that implements Multi Operating Point Analysis (MOPA) is related with the assumption of non varying health parameters with deviations along with the operating point. Cases of wrong diagnosis were detected when the above assumption was violated. Improvement on the diagnostic effectiveness of the MOPA method has been verified through careful selection of the parameters defining the operating point. Further improvement on diagnostic ability was achieved when a third, recently proposed method was applied. The method uses information produced from existing sensors when artificial operating points are defined close to the initial operating point. It was found that the third method can detect and correctly identify faults even in cases where the multipoint method fails.
Lymphedema Fat Graft: An Ideal Filler for Facial Rejuvenation
Fabio Nicoli,Ram M. Chilgar,Stamatis Sapountzis,Davide Lazzeri,Matthew Yeo Sze Wei,Pedro Ciudad,Marzia Nicoli,Seong Yoon Lim,Pei-Yu Chen,Joannis Constantinides,Hung-Chi Chen 대한성형외과학회 2014 Archives of Plastic Surgery Vol.41 No.5
Lymphedema is a chronic disorder characterized by lymph stasis in the subcutaneous tissue. Lymphatic fluid contains several components including hyaluronic acid and has manyimportant properties. Over the past few years, significant research has been performed toidentify an ideal tissue to implant as a filler. Because of its unique composition, fat harvestedfrom the lymphedema tissue is an interesting topic for investigation and has significantpotential for application as a filler, particularly in facial rejuvenation. Over a 36-monthperiod, we treated and assessed 8 patients with lymphedematous limbs who concurrentlyunderwent facial rejuvenation with lymphedema fat (LF). We conducted a pre- and postoperativesatisfaction questionnaire survey and a histological assessment of the harvested LFfat. The overall mean general appearance score at an average of 6 months after the procedurewas 7.2±0.5, demonstrating great improvement. Patients reported significant improvementin their skin texture with a reading of 8.5±0.7 and an improvement in their self-esteem. Thisstudy demonstrates that LF as an ideal autologous injectable filler is clinically applicable andeasily available in patients with lymphedema. We recommend the further study and clinicaluse of this tissue as it exhibits important properties and qualities for future applications andresearch.
Switching Model Predictive Control of a Pneumatic Artificial Muscle
George Andrikopoulos,George Nikolakopoulos,Ioannis Arvanitakis,Stamatis Manesis 제어·로봇·시스템학회 2013 International Journal of Control, Automation, and Vol.11 No.6
In this article, a switching Model Predictive Controller (sMPC) scheme for the position control of a Pneumatic Artificial Muscle (PAM) is being presented. The control scheme is based on a constrained linear and PieceWise Affine (PWA) system model approximation that is able to capture the high nonlinearities of the PAM and improve the overall model accuracy, and is composed of: a) a feed-forward term regulating control input at specific reference set-points, and b) a switching Model Predic-tive Controller handling any deviations from the system’s equilibrium points. Extended simulation studies were utilized in order to investigate and evaluate the efficacy of the suggested controller in the positioning problem of a PAM.
Proinflammatory cytokines in irritable bowel syndrome: a comparison with inflammatory bowel disease
( Antigony Mitselou ),( Vasileios Grammeniatis ),( Anna Varouktsi ),( Stamatis S Papadatos ),( Konstantinos Katsanos ),( Vasiliki Galani ) 대한장연구학회 2020 Intestinal Research Vol.18 No.1
Background/Aims: Irritable bowel syndrome (IBS) is a common disease often considered as a functional intestinal disorder. Inflammation in IBS is a quite intriguing theory. The aim of this study was to investigate tumor necrosis factor (TNF)-α, interleukin (IL)-1β and IL-6 expression in inflammatory bowel disease (IBD) patients, IBS patients and normal controls. Methods: IBS and IBD patients along with normal controls were recruited in the study. In all groups, 2 pinch biopsies were taken at each of 3 anatomical sites (terminal ileum, cecum, and rectum). IBS patients were also subcategorized according to the syndrome clinical manifestations. Two monoclonal antibodies (mAb), TNF-α mAb and IL-6 mAb, and one polyclonal antibody IL-1β mAb were applied for immunohistochemical analysis. Results: In IBD patients intensity of TNF-α and IL-1β were lower than in IBS patients or controls, while IL-6 was significantly increased comparing to the aforementioned groups. In IBS patients TNF-α was increased comparing to IBD patients or controls, while IL-6 and IL-1β were similar to controls. In IBS subgroups, TNF-α was lower in diarrhea predominant IBS patients and higher constipation predominant IBS patients. Differences among IBS subgroups regarding IL-6 and IL-1β were nonsignificant. Conclusions: IL-6 seems to be the most important proinflammatory cytokine in IBD patients, while TNF-α could play a more significant role in IBS pathogenesis. (Intest Res 2020;18:115-120)
SINGULAR THIRD-ORDER 3-POINT BOUNDARY VALUE PROBLEMS
ALEX P. PALAMIDES,ANASTASIA N. VELONI,STAMATIS ALATSATHIANOS 한국전산응용수학회 2010 Journal of applied mathematics & informatics Vol.28 No.3
In this paper, we prove existence of infinitely many positive and concave solutions , by means of a simple approach, to 3th order three-point singular boundary value problem [수식]Moreover with respect to multiplicity of solutions, we don’t assume any monotonicity on the nonlinearity. We rely on a combination of the analysis of the corresponding vector field on the phase-space along with Knesser’s type properties of the solu-tions funnel and the well-known Krasnosel’ski˘ı’s fixed point theorem. The later is applied on a new very simple cone K, just on the plane R². These extensions justify the efficiency of our new approach compared to the com-monly used one, where the cone K ⊂ C ([0, 1] ,R) and the existence of a positive Green’s function is a necessity.
Lymphedema Fat Graft: An Ideal Filler for Facial Rejuvenation
Nicoli, Fabio,Chilgar, Ram M.,Sapountzis, Stamatis,Lazzeri, Davide,Yeo, Matthew Sze Wei,Ciudad, Pedro,Nicoli, Marzia,Lim, Seong Yoon,Chen, Pei-Yu,Constantinides, Joannis,Chen, Hung-Chi Korean Society of Plastic and Reconstructive Surge 2014 Archives of Plastic Surgery Vol.41 No.5
Lymphedema is a chronic disorder characterized by lymph stasis in the subcutaneous tissue. Lymphatic fluid contains several components including hyaluronic acid and has many important properties. Over the past few years, significant research has been performed to identify an ideal tissue to implant as a filler. Because of its unique composition, fat harvested from the lymphedema tissue is an interesting topic for investigation and has significant potential for application as a filler, particularly in facial rejuvenation. Over a 36-month period, we treated and assessed 8 patients with lymphedematous limbs who concurrently underwent facial rejuvenation with lymphedema fat (LF). We conducted a pre- and postoperative satisfaction questionnaire survey and a histological assessment of the harvested LF fat. The overall mean general appearance score at an average of 6 months after the procedure was $7.2{\pm}0.5$, demonstrating great improvement. Patients reported significant improvement in their skin texture with a reading of $8.5{\pm}0.7$ and an improvement in their self-esteem. This study demonstrates that LF as an ideal autologous injectable filler is clinically applicable and easily available in patients with lymphedema. We recommend the further study and clinical use of this tissue as it exhibits important properties and qualities for future applications and research.