New Condition of Stabilisation for Continuous Takagi-Sugeno Fuzzy System based on Fuzzy Lyapunov Function

Yassine Manai,Mohamed Benrejeb 보안공학연구지원센터(IJCA) 2011 International Journal of Control and Automation Vol.4 No.2

Handwritten Mathematical Expressions Recognition

Yassine Chajri,Belaid Bouikhalene 보안공학연구지원센터 2016 International Journal of Signal Processing, Image Vol.9 No.5

In this paper, we will present a dataset of handwritten mathematical expressions outcome of several mathematical disciplines (logic, analysis, algebra and probability). This paper also describes all the details concerning the necessary steps of our approach for handwritten mathematical expressions recognition. At the end of this paper, we will present all the results obtained by this system.

An improved 1-D thermal model of parabolic trough receivers: Consideration of pressure drop and kinetic energy loss effects

Yassine Demagh Techno-Press 2022 Advances in energy research Vol.8 No.1

In this study, the first law of thermodynamics was used to establish a one-dimensional (1-D) thermal model for parabolic trough receiver (PTR) taking into account the pressure drop and kinetic energy loss effects of the heat transfer fluid (HTF) flowing inside the absorber tube. The validation of the thermal model with data from the SEGS-LS2 solar collector-test showed a good agreement, which is consistent with the previously established models for the conventional straight and smooth (CSS) receiver where the effects of pressure drop and kinetic energy loss were neglected. Based on the developed model and code, a comparative study of the newly designed parabolic trough S-curved receiver versus the CSS receiver was conducted and solar unit's performances were analyzed. Without any supplementary devices, the S-curved receiver enhances the performance of the parabolic trough module, with a maximum of 0.16% compared to CSS receiver with the same sizes and mass flow rates. Thermal losses were reduced by 7% due to the decrease in the temperature of the outer surface of the receiver tube. In addition, it has been shown that from a mass flow rate of 9.5 kg/s the heat losses of the S-curved receiver remain unchanged despite the improvement in the heat transfer rate.

Predictors of Short-Term Outcome of Kasai Portoenterostomy for Biliary Atresia in Infants: a Single-Center Study

Yassin, Noha Adel,El-Tagy, Gamal,Abdelhakeem, Omar Nagy,Asem, Noha,El-Karaksy, Hanaa The Korean Society of Pediatric Gastroenterology 2020 Pediatric gastroenterology, hepatology & nutrition Vol.23 No.3

Purpose: The outcome predictors of Kasai portoenterostomy (KPE) for biliary atresia (BA) are controversial. This study aimed to identify possible short-term outcome predictors of KPE for BA in infants. Methods: This retrospective study included infants with BA who underwent KPE between January 2015 and December 2017 and were followed up for at least 6 months after surgery at the Pediatric Hepatology Unit, Cairo University Pediatric Hospital, Egypt. The short-term outcome was jaundice clearance within 6 months following surgery. All data were compared between the jaundice free group and those with persistent jaundice to identify the predictors of jaundice clearance. Results: The study included 75 infants. The mean age at the time of surgery was 82.43±22.77 days (range, 37-150 days), and 28 (37.3%) infants cleared their jaundice within 6 months postoperative. Age at surgery did not significantly affect the outcome (p=0.518). Infants with persistent jaundice had significantly higher pre-operative levels of aspartate aminotransferase (AST) than those who were jaundice free (p=0.041). Receiver operating characteristic curve analysis showed that preoperative AST ≤180 IU/L was predictive of a successful KPE, with sensitivity 74.5% and specificity 60.7%. Infants with bile plugs in liver biopsy had a 6-fold higher risk of persistent jaundice than those without bile plugs (95% confidence interval: 1.59-20.75, p=0.008). Conclusion: Jaundice clearance after KPE for BA can be predicted using preoperative AST and presence of bile plugs in liver biopsy.

Human Papillomavirus Genotyping and p16INK4a Expression in Cervical Lesions: A Combined Test to Avoid Cervical Cancer Progression

Yassine Zouheir,Taoufiq Fechtali,Nadia Elgnaoui 대한암예방학회 2016 Journal of cancer prevention Vol.21 No.2

Cervical cancer is a major public health problem in Morocco. The cervical cancer has a long precancerous period that provides an opportunity for the screening and treatment. Improving screening tests is a priority goal for the early diagnosis of cervical cancer. This study was conducted to evaluate the combination of p16INK4a protein expression, human papillomavirus (HPV) typing, and histopathology for the identification of cervical lesions with high risk to progress to cervical cancer among Moroccan women. A total of 96 cervical biopsies were included in this study. Signal amplification in situ hybridization with biotinylated probes was used to detect HPV. Immunohistochemistry was used to evaluate the expression of p16INK4a protein. HPV DNA was detected in 74.0% of the biopsies (71/96). Of the seventy-one positive HPV cases, we detected 67.6% (48/71) of high risk (HR)-HPV (HPV 16 and 18), 24% of low risk-HPV (HPV 6 and 11), 1.4% intermediate risk-HPV (HPV 31, 33, and 35), and 7% coinfections (HPV 6/11 and 16/18). Overexpression of p16INK4a protein was observed in 72.9% (70/96) of the biopsies. In addition, p16INK4a protein detection was closely correlated with recovery of HR HPV. Our result showed that p16INK4a expression level is correlated with HR-HPV status. (J Cancer Prev 2016;21:121-125)

Design of an Integrated Inductor with Magnetic Core for Micro-Converter DC-DC Application

Yassin Dhahri,Sami Ghedira,Kamel Besbes 한국전기전자재료학회 2016 Transactions on Electrical and Electronic Material Vol.17 No.6

This paper presents a design procedure of an integrated inductor with a magnetic core for power converters. Thisprocedure considerably reduces design time and effort. The proposed design procedure is verified by the developmentof an inductor model dedicated to the monolithic integration of DC-DC converters for portable applications. Thenumerical simulation based on the FEM (finite elements method) shows that 3D modeling of the integrated inductorallows better estimation of the electrical parameters of the desired inductor. The optimization of the electricalparameter values is based on the numerical analysis of the influence of the geometric parameters on the electricalcharacteristics of the inductor. Using the VHDL-AMS language, implementation of the integrated inductor in a microBuck converter demonstrate that simulation results present a very promising approach for the monolithic integrationof DC-DC converters.

Screening and selection of autochthonous fungi from leachate contaminated-soil for bioremediation of different types of leachate

Yassine Zegzouti,Aziz Boutafda,Loubna El Fels,Miloud El Hadek,Fatou Ndoye,Nalla Mbaye,Lamfeddal Kouisni,Mohamed Hafidi 대한환경공학회 2020 Environmental Engineering Research Vol.25 No.5

This study aims to use contaminated soil with leachate to select autochthonous fungi that are able to bioremediate three types of leachate, (Young (YL), Intermediate (IL) and Old (OL)). Eleven fungal species were isolated via the enrichment method using the leachate as the sole source of carbon and energy. The isolates were evaluated for their ability to grow and remove organic pollutants at 100%, 50% and 25% (v/v) of leachate in both solid and liquid cultures that were spiked with malt extract. The results indicated that only three fungi, Aspergillus flavus (A. flavus-LC106118), Aspergillus niger (A. niger-KT192262) and Fusarium solani (F. solani-KX349467) showed significantly high capacity to grow on leachate, with maximum radial growth rates (Gr) of 7.5 ㎜, 4.7 ㎜, and 5.3 ㎜, respectively. In addition, 34%, 22%, and 27%, respectively of COD removal rates were obtained at 25% concentration in YL. A. flavus was the most tolerant fungus against landfill leachate, followed by F. solani, and finally A. niger. Therefore, these three fungi are good candidates for leachate bioremediation. However, for a better remediation, the combined effects of different types of fungi and leachates on the fungal growth need to be considered during the fungi selection.

Fabrication and Characterization of Ion-Doped p-Type Nanocrystalline Silicon Thin-Film Transistors

Yassine Djeridane,Pere Roca i Cabarrocas,김가현,김세환,배정호,정준영,장진 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.54 No.1

We report on the fabrication of coplanar p-channel nanocrystalline silicon thin-film transistors (nc-Si TFT) by using conventional boron ion doping. p-channel TFTs are necessary to implement complementary metal-oxide-semiconductor (CMOS) circuits with low power consumption, but amorphous silicon and polycrystalline silicon p-channel TFTs both have drawbacks, such as low hole mobility, high cost and poor uniformity. On the other hand, nanocrystalline silicon shows many merits, encouraging its use in CMOS circuits such as reasonable carrier mobility, high uniformity and ease of processing, despite these advantages, very few studies of p-type nanocrystalline silicon TFTs have been performed and there have been no documented efforts to adopt an ion-doped coplanar structure or to optimize its fabrication process. The TFTs presented herein have been fabricated using a conventional ion-doping process and show reasonably optimized characteristics, so the result demonstrated in this paper can be immediately adopted in a large-area, industrial system with little adjustment. Moreover, it is quite a new concept to use nanocrystalline silicon thin films for coplanar p-channel TFTs. The nanocrystalline silicon thin-films used in this work were grown on glass substrates at a low substrate temperature of 200 ℃ by using a SiF<SUB>4</SUB>/H<SUB>2</SUB>/Ar mixture. The TFTs that resulted from these films exhibited a field-effect mobility of 1.52 cm<SUP>2</SUP>/Vs, a gate voltage swing of 1.1 V/dec, an on/off ratio in excess of 10<SUP>6</SUP> and a threshold voltage of −6.28 V.

Public Shareholding Companies in the New Qatari Corporate Law: Flexibility and Efficiency

( Yassin El Shazly ) 고려대학교 법학연구원 2017 The Asian Business Lawyer Vol.19 No.-

By 2030, Qatar is aiming not only be an oil-based economy but as well a knowledge-based economy, guaranteeing a stable and sustainable business environment in order to assure the flow of investment. For this end, the State of Qatar introduced a package of legislative texts to boost the business climate. As a result, a new corporate law was promulgated in 2015 including many measures to facilitate the procedures to establish companies and mating the liquidity in the market. In this context, there is a need to analyze the legal protection of shareholders in order to assess the success of the new law in providing an efficient shareholders` protection.

Friction and wear performance of disc brake pads and pyroelectric energy harvesting

Yassine Tabbai,Amine Alaoui-Belghiti,Reddad El Moznine,Fouad Belhora,Abdelowahed Hajjaji,Abdessamad El Ballouti 한국정밀공학회 2021 International Journal of Precision Engineering and Vol.8 No.2

Due to the perpetual development of new technologies in the transportation industry, vehicles become more powerful and faster. As a result, the braking systems have to simultaneous follow this same rate of progression. The brake, a major safety organ, gets significant interest of engineers and researchers. The main purpose of this paper is to present a study based on numerical modelling coupling the thermodynamic and the thermoelectrical behaviours of an automobile brake disc for the prediction of the wear of disc brake pads and the time to be changed, as well as the harvesting of the thermal energy resulting from the braking operation. Firstly, an analysis of the thermal phenomena operating in a brake disc in service (heat fl ow generated by friction, high thermal gradients, temperature rise, and the speed of rotation of the disc) is presented. The proposed modelling is carried out taking into account the influence of different parameters such as the type of braking, the cooling mode, and the design materials. Then, the studies are focused on the use of a smart material for heat recovery due to the contact between the disc and the pads, this material has a capability of converting thermal energy into exploitable electric energy, as a consequence, we can predict the state of health and proper time to change the pads. This study is based on the pyroelectric effect, for a good prediction of the proper time to change the pads. The magnitudes of the voltage generated and the energy density harvested are shown as a function of the pads thicknesses, the speed and the temperature traversed by the pyroelectric material PZT.