|63||A fault tolerance mechanism in distributed and complex systems in a WAN and LAN|
Distributed and Complex Systems are more and more vulnerable to failures on account of their growing complexity and distribution. This problem motivates the need for a fault tolerance mechanism in such systems. Hence, we focus on two areas: (1) in a Wide Area Network, and (2) in a Local Area Network.
Then, as a second task, we concept a model of impact analysis of engine of rules in an environment object in which objects and their links of impact (CIs: elementary components of the information system contributing to the delivery of a service), are neither defined nor ordered and the real time restoration of analysis of impact results and presentation according to the various orchestrated processes. Thus our role is to conceive a design of impact analysis and its development guaranteeing in times of answer by using the inference of the fuzzy cognitive maps.
|104||A Varactor-Tunable Bandpass Filter Used as Phase Shifter|
Mohamed Ould Elhassen
This paper presents a varactor square ring tunable bandpass filter used as a phase shifter. This proposed structure is based on coupled Micro-strip resonator. We have used Momentum software of ADS-Agilent for the optimization and simulation of our circuit. A good result was obtained; in terms of insertion loss (0.31dB−0.17dB) over tuning range and bandwidth of (450MHz−640MHz). We compute a fractional bandwidth between 19% and 25% for different value of varactor capacitance. We have obtained also a good dynamic range of phase shifting about 90° at operating frequency.
|105||Characterization of Tapered Input Distributed Analog Phase Shifter|
Mohamed Ould Elhassen
In This work, the design, fabrication, and measurement of a tunable microwave tapered phase shifter is presented. A mathematical model of matching tapered transmission line, based on resolution of differential equations is investigated. We noticed a wideband operating frequency from 1.0GHz to 3.0GHz with average insertion loss lower than 1.0dB and return loss is about 10dB. A dynamic range of phase shift at 2.4GHz is about 100°. An excellent agreement between simulation results and measurement is obtained, that confirm the validity of our theoretical model.