Generalized Luenberger observers for fault detection in switched systems using H- index

International audience—In this paper, a linear matrix inequality (LMI) technique for the fault detection and state estimation of switched discrete systems is proposed. This approach is employed to generate generalized Luenberger minimal order observers giving best state estimation and sensitive fault detection. It consists on using H− index design. Sufficient conditions of global convergence of observers are proposed using switched Lyapunov functions. Numerical example is given to illustrate this method

PI robust fault detection observer for a class of uncertain switched systems using LMIs

International audienceThis paper addresses a method for robust fault detection and estimation by minimizing the disturbance and uncertainties to residual sensitivity. It consists in the design of proportional integral observer while minimizing the well known H ∞ norm for worst case uncertainties and disturbance attenuation, and combining a transient response specification. This multi-objective problem is formulated as linear matrix inequalities (LMI) feasibility problem in which a cost function is minimized subject to LMI constraints. This approach is employed to generate a set of robust observers for uncertain switched systems

H − /H ∞ robust fault detection observer for uncertain switched systems

International audienceThis paper addresses a method for robust fault detection (RFD) by maximizing the fault to residual sensitivity. It uses the newly developed H− index properties and minimizing the well known H∞ norm for worst case uncertainties and disturbance attenuation. These objectives are coupled to a transient response specification expressed by eigen region assignment formulation. The 3-objective robust fault detection problem is formulated as LMI feasibility problem in which a cost function is minimized subject to LMI constraints

Fault detection for LPV systems: Loop shaping H− approach

International audienceThis paper addresses a method for fault detection (FD) in linear parameters varying (LPV) systems by maximizing the fault to residual sensitivity. It uses the newly developed H − index properties and minimizing the well known H ∞ norm for worst case uncertainties and disturbance attenuation. A loop shaping approach for the H − FD problem is proposed. The multi-objectives problem is formulated as Linear Matrix Inequalities (LMI) problem for polytopic systems. An application on lateral vehicle dynamics is given as an illustrative example for this approach

Investigating the effect of organizational capacity on CRM performance

Many organizations try to provide products with lower prices and better quality to meet their customers’ needs by identifying and learning about customers and their needs, and to achieve this important, they need a powerful knowledge tool that relies on customers’ knowledge details. This paper presents an empirical investigation to study the effects of organizational capacity on the performance of customer relationship management. The study designs a questionnaire in Likert scale, distributes it among some experts and using structural equation modeling verifies that managers’ commitment influences the most on getting knowledge from customer (β = 0.389, Sig. = 0.000). In addition, Managers’ commitment influences positively on knowledge about customer (β = 0.355, Sig. = 0.000). Moreover, Staffs’ commitment influences on knowledge about customer (β = 0.36, Sig. = 0.000)

Post-chemotherapy residual mass in stage IIC seminomatous testicular tumor

Introduction The management of patients with residual masses following chemotherapy for advanced seminoma remains a difficult problem with no clear guidelines. While most patients with advanced seminoma achieve a complete or partial response with cisplatin based chemotherapy1, a significant number will reveal a residual mass on follow up CT scan or MR imaging2,3. Management options for post chemotherapy residual mass in a case of seminoma include close observation, radiation therapy and excisional surgery. While 80 to 85% of residual masses represent either fibrosis or necrotic tissue needing no further therapy, 10 to 15% may contain viable tumor which, if not recognized and effectively treated, may be lethal. A case of a stage II seminoma with post chemotherapy residual mass is presented and contemporary literature on this topic is reviewed

Effects of letrozole alone or letrozole in combination with low-dose intramuscular injection of human menopausal gonadotropin on ovulation and pregnancy of 150 patients with polycystic ovary syndrome

Background: Objective of the study was to explore the effects of letrozole (LE) in combination with low-dose intramuscular injection of human menopausal gonadotropin (HMG) on the ovulation induction and pregnancy of patients with polycystic ovary syndrome (PCOS).Methods: The study comprised of 150 couples who were randomly divided into two groups of 75 each. Group “A” received letrozole (LE) in a dose of 2.5 mg to 5mg /d. LE was started orally starting on 3rd to 5th day of menstrual cycle for 5 consecutive days. Group “B” received letrozole in a dose of 2.5 to 5 mg/day starting on the 3rd to 5th day of menstrual cycle for 5 consecutive days. Starting from the day of oral administration of letrozole, 75 IU HMG was injected intramuscularly on alternate days for 5 consecutive doses. The ovulation induction parameters and pregnancy outcomes were observed.Results: The Group A (LE group) had the most completed cycle (310 cycles), 157 (52.3%) of which had ovulation. The Group B (LE+HMG) group completed the fewest cycles (258 cycles), with 168 (65.1%) of them ovulating. This difference was statistically significant (P<0.05). On HCG injection day, both the endometrial thickness (11.5±1.2) and number of mature follicles (2.1±1.3) of the Group B were significantly higher than those of Group A (P<0.001), but the follicle diameters were similar (P>0.05) The pregnancy rate of the Group B was 54.7%, which was significantly higher than that of the Group A (29.3 %) (P<0.05) The average medication cycle of the Group B group was significantly shorter than that of the Group A (P<0.05).Conclusions: The regimen using LE in combination with low-dose intramuscular injection of HMG has satisfactory therapeutic effects on ovulation induction, short medication cycle and high clinical pregnancy rate, which is promising for treating patients with PCOS infertility