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Mathematical Model of Non-Coherent-DLL Discriminator Output and Multipath Envelope Error for BOC (α, β) Modulated Signals

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Positioning 2013年第1期4卷 65-79页

作者： Khaled Rouabah Chebir Saifeddine Salim Atia Mustapha Flissi djamel chikouche Electronics Department LMSE Laboratory University of Mohamed El-Bachir El-Ibrahimi Bordj Bou Arréridj Algeria Electronis Department LIS Laboratory University of M’sila M’sila Algeria

In this paper we propose the derivation of the expressions for the non-coherent Delay Locked Loop (DLL) Discriminator Curve (DC) in the absence and presence of Multipath (MP). Also derived, are the expressions of MP tracking errors in non-coherent configuration. The proposed models are valid for all Binary Offset Carrier (BOC) modulated signals in Global Navigation Satellite Systems (GNSS) such as Global Positioning System (GPS) and Future Galileo. The non-coherent configuration is used whenever the phase of the received signal cannot be estimated and thus cannot be demodulated. Therefore, the signal must be treated in a transposed band by the non-coherent DLL. The computer implementations show that the proposed models coincide with the numerical ones.

关键词： BOC Modulation GNSS PRN Code Multipath Discriminator Envelope Error

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Novel Kernel Function With a Hyperbolic Barrier Term to Primal-dual Interior Point Algorithm for SDP Problems

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Acta Mathematicae Applicatae Sinica 2022年第1期38卷 44-67页

作者： Imene TOUIL Wided chikouche LMPA Mohammed Seddik Ben Yahia UniversityJijel 18000Algeria

In this paper,we introduce for the first time a new eligible kernel function with a hyperbolic barrier term for semidefinite programming(SDP).This add a new type of functions to the class of eligible kernel *** prove that the interior-point algorithm based on the new kernel function meets O(n3/4 logε/n)iterations as the worst case complexity bound for the large-update *** coincides with the complexity bound obtained by the first kernel function with a trigonometric barrier term proposed by El Ghami et ***2012,and improves with a factor n(1/4)the obtained iteration bound based on the classic kernel *** present some numerical simulations which show the effectiveness of the algorithm developed in this paper.

关键词： Linear Semidefinite Programming Primal-Dual Interior Point Methods Hyperbolic Kernel Function Complexity Analysis Large and small-update methods

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Robust switched fractional controller for performance improvement of single phase active power filter under unbalanced conditions

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Frontiers in Energy 2016年第2期10卷 203-212页

作者： H. AFGHOUL F. KRIM D. chikouche A. BEDDAR LASS Laboratory Electronics Department Technology faculty University Mohamed Boudiaf of M'sila BP.166 Route Ichebilia M'sila28000 Algeria LEPCI Laboratory Electronics Department University of Ferhat AbbasSetif-1 route de B6jaia Setif 19000 Algeria Department of Electrical Engineering Technology faculty SkikdaUniversity Skikda 21000 Algeria

A novel controller is proposed to regulate the DC-link voltage of a single phase active power filter （SPAPF）. The proposed switched fractional controller （SFC） consists of a conventional PI controller, a fractional order PI （FO-PI） controller and a decision maker that switches between them. Commonly, the conventional PI controller is used in regulation loops due to its advantages in steady-state but it is limited in transient state. On the other hand, the FO-PI controller overcomes these draw- backs but it causes dramatic degradation in control performances in steady-state because of the fractional calculus theory and the approximation method used to implement this kind of controller. Thus, the purpose of this paper is to switch to the PI controller in steady-state to obtain the best power quality and to switch to the FO-PI controller when external disturbances are detected to guarantee a fast transient state. To investigate the efficiency and accuracy of the SFC considering all robustness tests, an experimental setup has been established. The results of the SFC fulfill the requirements, confirm its high performances in steady and transient states and demon- strate its feasibility and effectiveness. The experiment results have satisfied the limit specified by the IEEE harmonic standard 519.

关键词： conventional PI controller fractional calculus(FC) total harmonic distortion (THD) Oustaloup contin-uous approximation (OCA) single phase active power filter(SPAPF)

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New Composite Electrode Material Based on Glassy Carbone/Polythiophene/MnO2

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材料科学与工程（中英文B版） 2013年第5期3卷 305-309页

作者： Imene chikouche Ali Sahari Fahima Charef Ahmed Zouaoui Faculty of Technology Ferhat Abbas University Setif l 9000 Algeria

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Experimental Plans Method to Formulate a Resin Concrete

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Journal of Civil Engineering and Architecture 2012年第10期6卷 1376-1383页

作者： Miloud Beddar Zinedine Boudaoud Mohamed Aziz chikouche Halima Saadia M'hammedi Faculty of Technology Civil Engineering Department M'sila University M'sila 28000 Algeria Civil Engineering Department Oum Elbouaghi University OumElbouaghi 04000 Algeria

This work is an experimental approach based on the method of experimental plans to determine a specific formulation of a resin concrete. In this study, an unsaturated polyester resin （thermosetting resin） was used with two types of mineral fillers （dune sand and crushed sand）, and with the addition of a marble powder to ensure the continuity of the particle size mixing granular. The lack of the methods for developing this kind of composite materials, had led us to perform an initial experimental approach to define the experimental field, that is to say determine the mass proportions of the various compounds of mixture of our study. In the second approach, we have established and implemented fully experimental plans with three factors namely： factor （1）： sand, factor （2）： resin, factor （3）： marble powder. Test results being the density of polymer concrete and the mechanical resistances. Finally, multi-parameters regression allowed us to determine predictive mathematical models for the different responses of the study. Tests results showed that at three days we got a tensile strength of about 16 MPa with a resin concrete density of 1.9 g/cm3. This shows the advantages of this material.

关键词： Concrete polyester resin experimental plans method mechanical resistance

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