12 research outputs found
Hydrographic network extraction and watersheds delimitation software of the South Oran (North Wester Algeria)
The development of space technology has allowed a better understanding and effective use of water resources through the use of Digital Terrain Models (DTM) Mapping the river system from DTM has two objectives, namely identifying first topography descriptors like hills, ridges and valleys of watersheds and second hydrological parameters to map areas of runoff recovery for a more efficient development and also a better representation of the actual land occupation. Our work is part of a methodological approach to satellite imagery processing and mapping of topographic and hydrographic parameters of watersheds. Thus, from DTM one was able to extract the full river system of the region. The results show a remarkable evolution of human activities and especially in areas of high water recovery capacity.Keywords: remote sensing, DTM, network hydrology, geographic, steppe, west of Algeria
ON SOME RESULTS OF NUMBER THEORETIC TRANSFORM (NTT) -PERIODIC SIGNAL
The interest givento the application of Number Theoretic Transforms (NTT’s)to digital signal processing has not ceasegrow. These transformations are used to improve convolutions, where arithmetic operations give a modulo an integerresIn order to understand the domain of the NTT, we have to show their powerful properties and exploit them in diffeapplications such as in signal processing
Neural network-based MRAC control of dynamic nonlinear systems
This paper presents direct model reference adaptive control for a class of nonlinear systems with unknown nonlinearities. The model following conditions are assured by using adaptive neural networks as the nonlinear state feedback controller. Both full state information and observer-based schemes are investigated. All the signals in the closed loop are guaranteed to be bounded and the system state is proven to converge to a small neighborhood of the reference model state. It is also shown that stability conditions can be formulated as linear matrix inequalities (LMI) that can be solved using efficient software algorithms. The control performance of the closed-loop system is guaranteed by suitably choosing the design parameters. Simulation results are presented to show the effectiveness of the approach
A New Approach for Handling Element Accessibility Problems Faced by Persons with a Wheelchair
The built environment accessibility evaluation is required
if the person physical capacities no longer correspond to
the habitat requirements, which generally occur after
an accident. For the person with disabilities, the inner
accessibility of habitat is a highly important factor that
allows him to live and work independently. This paper
presents a new approach to determine the accessibility
of handling elements like doors, windows, etc. inside the
habitat for the wheelchair user. Thus, allowing housing
professionals to assess the needed changes in terms
of accessibility. The idea is to involve a new computer
approach to evaluating the performance of these elements
against wheelchair user capacity. The presented
approach simulated wheelchair user behavior when he/
she is operating a handling element in order to determine
the dimensions/positions of wheelchair clearance
space and handle grip optimal heights while considering
wheelchair arrival direction and respecting joint limits
constraints of person upper body and wheelchair nonholonomy
constraints
Revisión general sobre sistemas de acondicionamiento de aire en edificios ecológicos e inteligentes.
International audienc
Experiments and Large-Eddy Simulations of Lobed and Swirling Turbulent Thermal Jets for HVAC's Applications
International audienc
Contribution to the Experimental and Numerical Dynamic Study of a Turbulent Jet Issued from Lobed Diffuser
International audienc