Laita A.,Hassan iversity |
Belaissaoui M.,Hassan iversity
Advances in Intelligent Systems and Computing | Year: 2017
There is a huge paucity of empirical researches on Information Technology Governance (ITG) in public sector organizations even with the noticeable growing importance of IT in the public sector through several IT projects. ITG happens to be one of the most important levels of governance. It is an important approach to structure process through relational mechanisms. There is little evidence that success in implementing ITG reforms leads to morerapid and inclusive economics. This paper aims to study the importance of ITG in public sector organizations. The public sector is considered to be a set of organizations with the mission to serve citizens. Furthermore, this paper is going to come up with the answer to an essential question which is if ITG should rely on stable functions of a public sector organization, or should it consider broader and more evolving objectives touching the whole government?. © Springer International Publishing AG 2017.
Tilioua M.,Hassan iversity
Applied Mathematical Modelling | Year: 2010
This paper deals with the limiting behavior of a phase transition model in ferromagnetism. The model describes the three-dimensional evolution of both thermodynamic and electromagnetic properties of the ferromagnetic material. We are concerned with the passage from 3D to 2D in the theory of the paramagnetic-ferromagnetic transition. We identify the limit problem by using the so-called energy method. © 2010 Elsevier Inc.
Adekanle O.S.,Hassan iversity |
Guisser M.,Hassan iversity |
Abdelmounim E.,Hassan iversity |
Aboulfatah M.,Hassan iversity
International Review of Automatic Control | Year: 2017
After functioning for a long period, the intrinsic parameters of a grid-connected Doubly Fed Induction Generator may undergo variations due to temperature increase or saturation. The difference between real machine parameters and those considered during the synthesis of controllers may also differ due to modelling error. When this variation occurs, conventional controllers that depend on these machine parameters for their design and tuning may perform badly, leading to inefficient power control of the overall system. This paper presents the grid connected Doubly Fed Induction Generator wind energy conversion system under the Field Orientation Control scheme. A robust nonlinear Integral Backstepping controller is designed and analyzed to improve the efficiency of the system. The control strategy executes active and reactive power control through speed and current control at the rotor side converter. The proposed strategy is asymptotically stable in the context of Lyapunov theory and in the presence of parameter variations. Some simulation results are presented and discussed for a 660 kW wound rotor induction generator. © 2017 Praise Worthy Prize S.r.l. - All rights reserved
Berqia A.,University of Algarve |
Hanini M.,Hassan iversity |
Haqiq A.,Hassan iversity
International Journal of Mobile Computing and Multimedia Communications | Year: 2012
Packet scheduling and buffer management are the two important functions adopted in networks design to ensure the Quality of Service (QoS) when different types of packets with different needs of quality share the same network resources. The Packet scheduling policy determines packet service priorities at the output link, it can reduce packet delay and delay jitter for high-priority traffic. The buffer management involves packet dropping and buffer allocation. The overall goal of such schemes proposed in High Speed Downlink Packet Access (HSDPA) is to take advantage of the channel variations between users and preferably schedule transmissions to a user when the channel conditions are advantageous; it does not take in consideration the characteristics of the flows composing the transmitted traffic to the user. This paper compares two queue management mechanisms with thresholds applied for packets transmitted to an end user in HSDPA network. Those mechanisms are used to manage access packets in the queue giving priority to the Real Time (RT) packets and avoiding the Non Real Time (NRT) packets loss. The authors show that the performance parameters of RT packets are similar in the two mechanisms, where as the second mechanism improves the performance parameters of the NRT packets. © 2011, IGI Global.
Bounafaa A.,Hassan iversity |
Bounafaa A.,Sultan Moulay Slimane University |
Bounafaa A.,Pasteur Institute of Morocco |
Bounafaa A.,Université de Sherbrooke |
And 9 more authors.
Clinical Biochemistry | Year: 2014
Objective: The functionality of HDL has been suggested as an important factor in the prevention of cardiovascular and coronary artery diseases. The objective of the present study was to investigate the functionality of HDL and the factors that may affect the anti-atherogenic properties of HDL in ACS patients. Methods and results: One hundred healthy subjects and 205 ACS patients were recruited. HDL functionality was evaluated by measuring their capacity to mediate cholesterol efflux from J774 macrophages. Oxidative stress status was determined by measuring plasma malondialdehyde (MDA), protein carbonyl, and vitamin E levels by HPLC. The PON1 Q192R polymorphism status and PON1 paraoxonase and arylesterase activities of the healthy subjects and ACS patients were also determined. The HDL of ACS patients displayed a limited capacity to mediate cholesterol efflux, especially via the ABCA1-pathway. MDA (7.06 ± 0.29 μM) and protein carbonyl (9.29 ±. 0.26 μM) levels were significantly higher in ACS patients than in healthy subjects (2.29. ±. 0.21. μM and 3.07 ± 0.17 μM, respectively, p < 0.0001), while α- and γ-tocopherol (vitamin E) levels in ACS patients were 8-fold (p. <. 0.001) and 2-fold (p. <. 0.05) lower than in healthy subjects. Paraoxonase, arylesterase and HDL-corrected PON1 activities (PON1 activity/HDL ratio) were significantly lower in ACS patients. Logistic regression analyses showed that high PON1 paraoxonase and arylesterase activities had a significant protective effect (OR = 0.413, CI 0.289-0.590, p < 0.001; OR = 0.232 CI 0.107-0.499, p < 0.001, respectively) even when adjusted for HDL level, age, BMI, and PON1 polymorphism. Conclusion: The results of the present study showed that the functionality of HDL is impaired in ACS patients and that the impairment may be due to oxidative stress and an alteration of PON1 activities. © 2014 The Canadian Society of Clinical Chemists.
Khazri Y.,Hassan II University Mohammedia - Casablanca |
Rouane M.,Hassan II University Mohammedia - Casablanca |
Fahli A.,Hassan II University Mohammedia - Casablanca |
Moussetad M.,Hassan II University Mohammedia - Casablanca |
And 2 more authors.
International Journal of Online Engineering | Year: 2014
E-learning environments are becoming increasingly popular in higher education. One of the most important e-learning resources is the remote laboratory. It gives students opportunities to learn technical training through internet, perform real experience and interact with real equipment and real instruments laboratory. This paper describes the development of interactive remote laboratory that allows learners to use, control and interact with the measuring instruments used in the real laboratories (like oscilloscope, GBF...). Therefore, we chose to put the manipulation of the signal treatment module on line.
Nguyen Q.T.,CNRS Polymers, Biopolymer and Surfaces Laboratory |
Alaoui O.T.,CNRS Polymers, Biopolymer and Surfaces Laboratory |
Alaoui O.T.,Hassan iversity |
Yang H.,East China University of Science and Technology |
Mbareck C.,CNRS Polymers, Biopolymer and Surfaces Laboratory
Journal of Membrane Science | Year: 2010
The dry-cast process was applied to the preparation of microporous membranes of different structures, using semi-crystalline and amorphous synthetic polymers. It consisted in casting a solution of a polymer in a mixture of a volatile solvent and a less volatile nonsolvent into a film, and leaving the film for a preferential evaporation of the solvents in air. A dry microporous membrane was obtained through liquid-liquid phase inversion with or without polymer crystallization, depending on the polymer nature, without the need to coagulate the membrane in a nonsolvent bath. We analyzed in details the physico-chemical aspects of the membrane formation in the case of poly(vinylidene fluoride), then discussed the applicability of the process to other common polymer materials like poly(vinyl chloride), poly(vinylacetate), poly(styrene) and polysulfone-cardo. The process advantages and drawbacks in the microporous membrane preparation were given. © 2010 Elsevier B.V.
Ait Houaich Y.,Hassan iversity |
Belaissaoui M.,Hassan iversity
2015 World Congress on Information Technology and Computer Applications, WCITCA 2015 | Year: 2015
The use of open source software (OSS) offers several advantages such as cost savings, security and the ability to modify the source code , which encourages companies to adopt it. Today there is a large number of OSS available that meet different requirements (Feller, and Fitzgerald, 2002)  , which makes their selection a very difficult stage. The contribution of this work is to develop our national economy, by proposing a new evaluation model that will facilitate to decisionmakers of small and medium enterprises in Morocco and in other countries to improve the productivity by enhancing their information system with open source technology. To test and validate our proposed model, we applied it at a Moroccan company that sells heavy equipment and wished to supervise the IT infrastructure of its subsidiaries in Africa using a scalable and free solution, and also at nineteen small and medium companies. © 2015 IEEE.
Boudaoud A.,Hassan iversity |
Abdelmounim E.,Hassan iversity |
Barazzouk A.,Hassan iversity |
Zbitou J.,Hassan iversity
International Conference on Multimedia Computing and Systems -Proceedings | Year: 2014
This paper presents the study of two decoder architectures and their VHDL design and implementation on a FPGA circuit. Both decoders are designed for Difference Set Cyclic (DSC) codes. The first one is the Hard In - Hard Out decoder (HIHO), and the second one is the Massey's threshold Soft In - Hard Out (SIHO) decoder. The two architectures are analyzed and discussed for serial and parallel processing implementations. The results show that the complexity, measured by the number of Logical Elements (LE) which is directly proportional to the silicon area occupied by the decoder, varies linearly for serial processing and hyperbolically for parallel processing. Increased complexity related to parallel processing can be accepted in turbo decoders. The resulting latency (L) is equal to the code length (n) multiplied by the clock period (H): (L=n H). © 2014 IEEE.
PubMed | Hassan iversity
Type: Journal Article | Journal: Neurochemistry international | Year: 2012
Increased neurosteroids with allosteric modulatory activity on GABA(A) receptors such as 3-5 tertrahydroprogesterone; allopregnanolone (ALLO), are candidates to explain the phenomenon of increased GABAergic tone in hepatic encephalopathy (HE). However, it is not known how changes of other GABA(A) receptor modulators such as dehydroepiandrosterone sulfate (DHEAS) contribute to altered GABAergic tone in HE. Concentrations of DHEAS were measured by radioimmunoassay in frontal cortex samples obtained at autopsy from 11 cirrhotic patients who died in hepatic coma and from an equal number of controls matched for age, gender, and autopsy delay intervals free from hepatic or neurological diseases. To assess whether reduced brain DHEAS contributes to increased GABAergic tone, in vitro patch clamp recordings in rat prefrontal cortex neurons were performed. A significant reduction of DHEAS (5.810.88 ng/g tissue) compared to control values (9.700.79 ng/g, p<0.01) was found. Brain levels of DHEAS in patients with liver disease who died without HE (11.431.74 ng/g tissue), and in a patient who died in uremic coma (12.56 ng/g tissue) were within the control range. Increasing ALLO enhances GABAergic tonic currents concentration-dependently, but increasing DHEAS reduces these currents. High concentrations of DHEAS (50 M) reduce GABAergic tonic currents in the presence of ALLO, whereas reduced concentrations of DHEAS (1 M) further stimulate these currents. These findings demonstrate that decreased concentrations of DHEAS together with increased brain concentrations of ALLO increase GABAergic tonic currents synergistically; suggesting that reduced brain DHEAS could further increase GABAergic tone in human HE.