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Blind Channel Estimation and Equalization
Said Elkassimi,Said Safi,B. Manaut 보안공학연구지원센터 2016 International Journal of Multimedia and Ubiquitous Vol.11 No.12
This paper presents the problem of blind channel estimation of a non-minimum phase system using three algorithms. These algorithms play an important role for blindly estimate the parameters of radio mobile channel. Thus studying the problem of blind channel equalization based on, the proposed algorithm, CMA and SKMAA algorithms. The simulation results in noisy environment and for different SNR values demonstrate that the proposed algorithm is more performing than other algorithms. In addition the Sign Kurtosis Maximization Adaptive Algorithm (SKMAA) is more powerful in comparison to constant modulus algorithm (CMA) at the blind channel equalization, that is to say gives the right equalization.
Highly Efficient Control of the Doubly Fed Induction Motor
Said Drid,Abdesslam Makouf,Mohamed-Said Nait-Said,Mohamed Tadjine 대한전기학회 2007 Journal of Electrical Engineering & Technology Vol.2 No.4
This paper deals with the high efficient vector control for the reduction of copper losses of the doubly fed motor. Firstly, the feedback linearization control based on Lyapunov approach is employed to design the underlying controller achieving the double fluxes orientation. The fluxes' controllers are designed independently of the speed. The speed controller is designed using the Lyapunov method especially employed to the unknown load torques. The global asymptotic stability of the overall system is theoretically proven. Secondly, a new Torque Copper Losses Factor is proposed to deal with the problem of the machine copper losses. Its main function is to optimize the torque in keeping the machine saturation at an acceptable level. This leads to a reduction in machine currents and therefore their accompanied copper losses guaranteeing improved machine efficiency. The simulation and experimental results in comparative presentation confirm largely the effectiveness of the proposed DFIM control with a very interesting energy saving contribution.
Highly Efficient Control of the Doubly Fed Induction Motor
Drid, Said,Makouf, Abdesslam,Nait-Said, Mohamed-Said,Tadjine, Mohamed The Korean Institute of Electrical Engineers 2007 Journal of Electrical Engineering & Technology Vol.2 No.4
This paper deals with the high efficient vector control for the reduction of copper losses of the doubly fed motor. Firstly, the feedback linearization control based on Lyapunov approach is employed to design the underlying controller achieving the double fluxes orientation. The fluxes# controllers are designed independently of the speed. The speed controller is designed using the Lyapunov method especially employed to the unknown load torques. The global asymptotic stability of the overall system is theoretically proven. Secondly, a new Torque Copper Losses Factor is proposed to deal with the problem of the machine copper losses. Its main function is to optimize the torque in keeping the machine saturation at an acceptable level. This leads to a reduction in machine currents and therefore their accompanied copper losses guaranteeing improved machine efficiency. The simulation and experimental results in comparative presentation confirm largely the effectiveness of the proposed DFIM control with a very interesting energy saving contribution.
Thermal Hydraulic Analysis of Core Flow Bypass in a Typical Research Reactor
Said M.A. Ibrahim,Salah El-Din El-Morshedy,Abdelfatah Abdelmaksoud 한국원자력학회 2019 Nuclear Engineering and Technology Vol.51 No.1
The main objective of nuclear reactor safety is to maintain the nuclear fuel in a thermally safe conditionwith enough safety margins during normal operation and anticipated operational occurrences. In thisresearch, core flow bypass is studied under the conditions of the unavailability of safety systems. As corebypass occurs, the core flow rate is assumed to decrease exponentially with a time constant of 25 s tonew steady state values of 20, 40, 60, and 80% of the nominal core flow rate. The thermal hydraulic codePARET is used through these calculations. Reactor thermal hydraulic stability is reported for all cases ofcore flow bypass.
Investigating the Public Spending and Economical Growth on the Poverty Reduction in Indonesia
Said Muhammad,T. Zulham,Diana Sapha,Fitriyani,Jumadil Saputra 대한산업공학회 2019 Industrial Engineeering & Management Systems Vol.18 No.3
Poverty and income inequality are being one of the most challenging issues in many developing countries, including Indonesia. Considering the higher level of the poverty rate in Indonesia, the study about poverty reduction is crucial and currently under discussion in previous studies. Thus, this study is written to examine what is education and health budgets could be reducing the poverty rate in Indonesia. The study utilizes annual data gathered from the Central Bureau of Statistics over the 2007–2017 period and analyzed using panel data by assisting the Eviews-10. The empirical result finds that the budget allocated for education and health significantly reduce the poverty rate in Indonesia. Therefore, it is suggested that to further reduce the poverty level, the government should allocate more budget of education and health for the poor and there is a need to monitor the public service performance with the aim the allocation of expenditure can be more efficient and effective. Besides, it is necessary to increase the number of pro-poor programs such as free public health and education insurance to fulfill the basic needs of the poor.
Numerical study of reinforced natural slope by retaining wall with prestressed anchor
Said, Nouri,Amar, Nechnech Techno-Press 2021 Advances in materials research Vol.10 No.2
The slope design under geological and hydraulic conditions has always been a different geotechnics problem. There have been potential main landslide and an undisturbed thin layer of saturated clays soil under the slopes in urban construction development area of Miliana city province of Algeria; its terrain is mountains. The landslide was framed by gravity creeping of thin layer of alluvium and mares cracks along steep clays. The favorable sliding surface larger than 2500 m<sup>2</sup> had destroyed the foundation of the building. In order to learn from the comparison between stabilized and non-stabilized slopes with different improvement, the authors also investigated the slopes reinforced by retaining wall with prestressed anchor and discussed their behavior parameters. Based on finite element method, the analysis of slope stability under natural conditions is discussed first, then the support structure of retaining wall and anchor reinforced and their effect of slope stability are analyzed, and also the slope stability of each case is able to be compared. The results show that the stability of slope was significantly improved after reinforcement, and anchor reinforced with retaining wall has obvious reverse anchoring effect on soil. By comparing the factor of safety, stress level and displacement field before and after slope reinforcement, it is found that better reinforcement results can be achieved if strong reinforcement is applied upon the regions with high sliding surface. Furthermore, the increase in stress level at the zone dangerous is more favorable of improving the safety of the critical region.
Said Ghnimi,Adnen Rajhi,Ali Gharsallah 한국자기학회 2016 Journal of Magnetics Vol.21 No.1
In this paper, the theoretical and experimental characteristics of magnetic and electric fields in the vicinity of high voltage lines are investigated. To realize these measurements and calculations, we have developed some equations for two overhead power line configurations of 150 ㎸ (single circuit, double circuit), based on Biotsavart law, image and Maxwell theories, in order to calculate the magnetic and electric fields. The measurements were done to a maximum distance from the tower of 50 m, at a height of 1m from the ground. These experiments take into consideration the real situations of the power lines and associated equipment. The experimental results obtained are near to that of the Biot-Savart theoretical results for a far distance from the tower; and for a distance close to the power line, the results from the image theory are in good agreement with the experimental results.