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.

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.

Cultural Misrepresentation through Translation

Said Faiq 세종대학교 언어연구소 2008 Journal of Universal Language Vol.9 No.2

The space of intercultural communication is bound to make translation the par excellence site for the negotiation, understanding and/or contestation of the relationships of power and knowledge across cultures. In these intercultural encounters, translation has played a decisive role in the formation and/or deformation of cultural realities through systems, the master discourses, of representing the foreign (other) for the local (self). In the process of translation, a master discourse, the product of a specific cultural context where translation takes place, is used as the medium for the exchange of cultural goods, most importantly literary ones. Drawing on a number of translation instances, this article examines the lack of innocence of translation as the medium of intercultural communication.

Asymptotic Behavior of Solutions of Certain Nonlinear Differential and Integro-differential Equations

Said R. Grace,Sandra Pinelas 장전수학회 2010 Proceedings of the Jangjeon mathematical society Vol.13 No.2

We establish several growth theorems for second order nonlinear differential and integro-differential equations. We also give necessary and suffcient conditions for solutions of second order non-linear differential equations to be bounded together with their frst derivatives and investigate its asymptotic behavior.

Modeling of Unsymmetrical Single-lane Roundabouts based on Stopping Sight Distance

Said M. Easa 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.2

Evaluation of the adequacy of sight distance at roundabout is usually performed graphically as no quantitative guidelines are available for the lateral clearance needs. This paper presents analytical lateral clearance models to satisfy Stopping Sight Distance (SSD) at unsymmetrical single-lane roundabouts (with different entry and exit radii). The models are developed for three critical locations: approach sight distance, sight distance to exist crosswalk, and circulatory roadway sight distance. Two cases of approach sight distance are presented: sight distance to the crosswalk and sight distance to the yield line. The required lateral clearance at any specified point along the curve can also be determined. Design aids for the required maximum lateral clearance are established for the three locations of sight distance based on accurate SSD formula that accounts for effect of the radial deceleration component of the vehicle. For the circulatory roadway sight distance, infeasible combinations of the circulatory roadway radius and speed are identified based on acceptable driver’s field of peripheral vision. The models and results of this paper, which are applicable to both symmetrical and unsymmetrical roundabouts, should be of interest to highway engineers and designers.

Association of trainee involvement in an acute pain service with postoperative opioid use in patients undergoing cytoreductive surgery with hyperthermic intraperitoneal chemotherapy

Said Engy T.,Sztain Jacklynn F.,Martin Erin I.,Abramson Wendy B.,Meineke Minhthy N.,Furnish Timothy J.,Swisher Matthew W,Gabriel Rodney A. 대한마취통증의학회 2020 Korean Journal of Anesthesiology Vol.73 No.3

Background: Several hospitals have implemented a multidisciplinary Acute Pain Service (APS) to execute surgery-specific opioid sparing analgesic pathways. Implementation of an anesthesia attending-only APS has been associated with decreased postoperative opioid consumption, time to ambulation, and time to solid food intake for patients undergoing cytoreductive surgery with hyperthermic intraperitoneal chemotherapy. In this study, we evaluated the impact of introducing an APS trainee on postoperative opioid consumption in patients undergoing hyperthermic intraperitoneal chemotherapy during postoperative day (POD) 0–3. Methods: We performed a retrospective propensity-matched cohort study where we compared opioid consumption and hospital length of stay among two historical cohorts: attending-only APS service versus service involving a regional anesthesia fellow. Results: In the matched cohorts, the median POD 0–3 opioid use [25%, 75% quartile] for the single attending and trainee involvement cohort were 38.5 mg morphine equivalents (MEQ) [14.1 mg, 106.3 mg] and 50.4 mg MEQ [28.4 mg, 91.2 mg], respectively. The median difference was –9.8 mg MEQ (95% CI –30.7 to 16.5 mg; P = 0.43). There was no difference in hospital length of stay between both cohorts (P = 0.67). Conclusions: We found that the addition of a regional anesthesia fellow to the APS team was not associated with statistically significant differences in total opioid consumption or hospital length of stay in this surgical population. The addition of trainees to the infrastructure, with vigilant supervision, is not associated with change in outcomes.

Finite element analysis of elastic property of concrete composites with ITZ

Said Abdelmoumen,Brandon Lynge,Michele Queneudec-t'Kint,Emmanuel Bellenger 사단법인 한국계산역학회 2010 Computers and Concrete, An International Journal Vol.7 No.6

For better estimation of elastic property of concrete composites, the effect of Interfacial Transition Zone (ITZ) has been found to be significant. Numerical concrete composites models have been introduced using Finite Element Method (FEM), where ITZ is modeled as a thin shell surrounding aggregate. Therefore, difficulties arise from the mesh generation. In this study, a numerical concrete composites model in 3D based on FEM and random unit cell method is proposed to calculate elastic modulus of concrete composites with ITZ. The validity of the model has been verified by comparing the calculated elastic modulus with those obtained from other analytical and numerical models.

Investigating the Cash Holding Factors of Mining Industries in Indonesia Stock Exchange

Said Musnadi,Ghazali Syamni,Nasir,Faisal,Jumadil Saputra 대한산업공학회 2020 Industrial Engineeering & Management Systems Vol.19 No.3

The purpose of this study is to explore determinant factors that enable mining companies for cash holding in Indonesia. The panel data gathered from 40 financial statements of mining companies in Indonesia for the period 2013-2017 with a total of 200 observations. The panel data regression analysis used to examine and select the best model by utilizing the common effect model, fixed effect model and random effect model. The results of the study found that a cash holding company was determined by the return on assets, return on equity, net capital working, firm size, leverage and cash conversion cycle. All research variables mentioned above support trade-off theory except return on assets. The limitation of this study emerged since it made no separate discussion between the largest and the smallest cash holding companies. The results of this study have implications for management and companies to investigate other indicators enabling companies to conduct cash holding. Some suggested variables are macroeconomic factors, payment of dividends and investment opportunities and separation of large and small companies. The management of mining companies in managing cash holding was required to observe closely to the independent variables that match the trade-off or pecking order theory even the free cash flow theory.