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Ali Zribi,Mohamed Chtourou,Mohamed Djemel 제어·로봇·시스템학회 2017 International Journal of Control, Automation, and Vol.15 No.1
This paper deals with the control of nonlinear systems using multimodel approach. The main idea ofthis work consists on the association of the gap metric and the stability margin tools to reduce the number ofmodels constituting the multimodel bank. In fact, the self-organisation map (SOM) algorithm is used, firstly, todevelop a preliminary multimodel bank. Then, the gap metric and the stability margin are computed to determinethe redundancy of the initial multimodel bank. So, the multimodel controller is elaborated based on the reducedmodel bank. Simulations confirm the method for selecting the appropriate number of local models which should beused in the controller design.
Alya Soudani,Sondess Hadjfredj,Meriem Zribi,Feriel Messaadi,Taieb Messaoud,Afef Masmoudi,Mohamed Zribi,Chedlia Fendri 한국미생물학회 2011 The journal of microbiology Vol.49 No.3
Forty three isoniazid (INH)-resistant Mycobacterium tuberculosis isolates were characterized on the basis of the most common INH associated mutations, katG315 and mabA -15C→T, and phenotypic properties (i.e. MIC of INH, resistance associated pattern, and catalase activity). Typing for resistance mutations was performed by Multiplex Allele-Specific PCR and sequencing reaction. Mutations at either codon were detected in 67.5% of isolates: katG315 in 37.2, mabA -15C→T in 27.9 and both of them in 2.4%, respectively. katG sequencing showed a G insertion at codon 325 detected in 2 strains and leading to amino acid change T326D which has not been previously reported. Distribution of each mutation, among the investigated strains,showed that katG S315T was associated with multiple-drug profile, high-level INH resistance and loss or decreased catalase activity; whereas the mabA -15C→T was more prevalent in mono-INH resistant isolates,but it was not only associated with a low-level INH resistance. It seems that determination of catalase activity aids in the detection of isolates for which MICs are high and could, in conjunction with molecular methods,provide rapid detection of most clinical INH-resistant strains.
A Recursive State Estimator in the Presence of State Inequality Constraints
Mohamed Fahim Hassan,Mohamed Zribi,Hamed M. K. Alazemi 제어·로봇·시스템학회 2011 International Journal of Control, Automation, and Vol.9 No.2
This paper proposes an optimal recursive estimator to estimate the states of a stochastic discrete time linear dynamic system when the states of the system are constrained with inequality constraints. The case when the constraints are strictly satisfied is treated independently from the case when some of the constraints are violated. For the first case, the well known Kalman filter estimator is used. In the second case, an algorithm which uses a series of successive orthogonalizations on the measurement subspaces is employed to obtain the optimal estimate. It is shown that the proposed estimator has several attractive properties such that it is an unbiased estimator. More importantly, compared to other estimator found in the literature, the proposed estimator needs less computational efforts, is numeri-cally more stable and it leads to a smaller variance. To show the effectiveness of the proposed estima-tor, several simulation results are presented and discussed.
Ammari, H.,Kang, H.,Lee, H.,Lim, M.,Zribi, H. Academic Press 2009 Journal of differential equations Vol.247 No.11
When two inclusions get closer and their conductivities degenerate to zero or infinity, the gradient of the solution to the conductivity equation blows up in general. In this paper, we show that the solution to the conductivity equation can be decomposed into two parts in an explicit form: one of them has a bounded gradient and the gradient of the other part blows up. Using the decomposition, we derive the best possible estimates for the blow-up of the gradient. We then consider the case when the inclusions have positive permittivities. We show quantitatively that in this case the size of the blow-up is reduced.