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1.
The Journal of Supercomputing - Data warehouses are very large databases and play key role in intelligent decision making in enterprises. The bitmap join indexes selection problem is crucial in the... 相似文献
2.
Charef-Khodja Djemai Toumi Abida Medouakh Saadia Sbaa Salim 《Multimedia Tools and Applications》2021,80(14):21381-21407
Multimedia Tools and Applications - There are mainly two components in almost every visual object tracking algorithm, which are the object presentation and the searching mechanism. In the... 相似文献
3.
Boudet S Peyrodie L Forzy G Pinti A Toumi H Gallois P 《Computer methods and programs in biomedicine》2012,108(1):234-249
Adaptive Filtering by Optimal Projection (AFOP) is an automatic method for reducing ocular and muscular artifacts on electro-encephalographic (EEG) recordings. This paper presents two additions to this method: an improvement of the stability of ocular artifact filtering and an adaptation of the method for filtering electrode artifacts. With these improvements, it is possible to reduce almost all the current types of artifacts, while preserving brain signals, particularly those characterising epilepsy. This generalised method consists of dividing the signal into several time-frequency windows, and in applying different spatial filters to each. Two steps are required to define one of these spatial filters: the first step consists of defining artifact spatial projection using the Common Spatial Pattern (CSP) method and the second consists of defining EEG spatial projection via regression. For this second step, a progressive orthogonalisation process is proposed to improve stability. This method has been tested on long-duration EEG recordings of epileptic patients. A neurologist quantified the ratio of removed artifacts and the ratio of preserved EEG. Among the 330 artifacted pages used for evaluation, readability was judged better for 78% of pages, equal for 20% of pages, and worse for 2%. Artifact amplitudes were reduced by 80% on average. At the same time, brain sources were preserved in amplitude from 70% to 95% depending on the type of waves (alpha, theta, delta, spikes, etc.). A blind comparison with manual Independent Component Analysis (ICA) was also realised. The results show that this method is competitive and useful for routine clinical practice. 相似文献
4.
The paper focuses on debonding propagation along an interface, notably on the major influence of the interlocking between
the two faces of the debonding interface. The aim of the study is to obtain the data necessary for relevant and efficient
debonding modelling. The work associates experiment and simulation with the purpose of quantifying the interlocking along
the interface. The overlay material investigated was a fibre reinforced mortar (FRM). Direct tension tests of notched FRM
specimens were firstly conducted to obtain the tensile strength and the residual normal stress—crack width relationship. Its
Young's modulus was determined from compression tests. The substrate-overlay interface was investigated by direct tension
tests and flexure tests performed on composite substrate-overlay specimens. The direct tension tests provided the interface
tensile strength and the relationship between debonding-opening and residual normal tensile stress. Three point flexural static
tests informed on the structural behaviour of the interface. The debonding interface propagation was monitored using a video-microscope
with a maximum enlargement of ×175.
Using the identified and quantified parameters, modelling of the above mentioned static tests was carried out by the finite
elements method using CAST3M code developed in France by CEA (Centre for Atomic Energy). The comparison of modelling and experiment
results shows a good coherence and proves the important role of interlocking on the debonding mechanism. 相似文献
5.
Previous studies demonstrated that crack cutting bonded cement-based repairs is highly detrimental to the durability of such applications. Laboratory tests and field experience showed that fibre reinforcement allowing the control of the crack opening and assuring the structural continuity is a solution to enhance the durability of bonded cement-based repairs. In other respect, recent work pointed out that the use of rubber aggregates obtained from grinding end-of-life tyres is a suitable solution to improve the strain capacity of cement-based materials. The present contribution focuses on the synergetic effect of rubber aggregate incorporation and of fibre reinforcement from the point of view of the use of the composite in the repair work application. 相似文献
6.
Mohamed Jemli Hechmi Ben Azza Moncef Gossa 《Simulation Modelling Practice and Theory》2009,17(6):1071-1080
Single Phase induction Motors (SPIMs) are one of the widely used motors in the world. This explains the interest accorded by researchers on the improvement of the quality and performances of these motors. The availability of low-cost static converters makes possible the economic use of energy and improvement of the quality of the electromagnetic torque in the SPIM. Nowadays, Indirect Rotor-Field-Oriented Control (IRFOC) techniques brought on a renaissance in modern high-performance control of PWM inverter fed SPIM. In this paper, an IRFOC system is proposed for SPIMs including a relatively simple and effective decoupling scheme. This is achieved by introducing two new decoupling signals to the system. However, model asymmetry in SPIMs causes extra coupling between two stator windings. To use the field orientation control, the asymmetry must be eliminated by using an appropriate variable changing. A computer simulation of the IRFOC for Single-Phase Induction Motor drive is carried out to test the validity of the proposed method at nominal and zero speed. The design, analysis, and implementation for a 1.1-kW Single-Phase Induction Motor are completely carried out using a dSPACE DS1104 digital signal processor (DSP) based real-time data acquisition control (DAC) system, and MATLAB/Simulink environment. Digital simulation and experimental results are presented to show the improvement in performance of the proposed algorithm. 相似文献
7.
Hafri Mohamed Toumi Hechmi Lespessailles Eric Jennane Rachid 《Pattern Analysis & Applications》2020,23(2):581-591
Pattern Analysis and Applications - This paper investigates a 3D novel dual active contours approach to segment multiple regions in medical images. The locally based segmentation approaches can... 相似文献
8.
Contribution of irrigation and cultivars to volatile profile and sensory attributes of selected virgin olive oils produced in Tunisia 总被引:1,自引:0,他引:1
9.
Modification of pomological characteristics and flavour components of fruits and virgin olive oil following wastewater irrigation and soil tillage 下载免费PDF全文
10.
Michael Spiro Ralf Toumi Mangayetkarasy Kandiah 《Journal of the science of food and agriculture》1989,46(3):349-356
Green and medium-roast Kenyan arabica coffees were ground and sieved, and the 0·85–1·8 mm size fractions partially converted into two water-swollen forms by an appropriate series of treatments. The first form still contained a mix of coffee solubles, the second only caffeine. The rates of caffeine infusion into water at 80°C were then measured for the dry coffee and for the two water-swollen preparations. The caffeine was extracted two to three times faster from the solute-free water-swollen preparation than from the dry material Analysis of the results showed that counterflow of water the swelling of coffee particles, caffeine association with other solubes and physical restraints within the bean matrix all contribute to the low diffusion coefficient of caffeine inside the coffee particles. The behaviour of the green and the medium roast coffees was surprisingly similar. 相似文献