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Sampling theorems associated with differential operators with finite rank perturbations
Mahmoud H. Annaby,Omar H. El-Haddad,Hassan A. Hassan 대한수학회 2016 대한수학회지 Vol.53 No.5
We derive a sampling theorem associated with first order self-adjoint eigenvalue problem with a finite rank perturbation. The class of the sampled integral transforms is of finite Fourier type where the kernel has an additional perturbation.
SAMPLING THEOREMS ASSOCIATED WITH DIFFERENTIAL OPERATORS WITH FINITE RANK PERTURBATIONS
Annaby, Mahmoud H.,El-Haddad, Omar H.,Hassan, Hassan A. Korean Mathematical Society 2016 대한수학회지 Vol.53 No.5
We derive a sampling theorem associated with first order self-adjoint eigenvalue problem with a finite rank perturbation. The class of the sampled integral transforms is of finite Fourier type where the kernel has an additional perturbation.
Lazhar Rmili,Mahmoud Hamouda,Salem Rahmani,Handy Fortin Blanchette,Kamal Al-Haddad 전력전자학회 2017 JOURNAL OF POWER ELECTRONICS Vol.17 No.4
An indirect matrix converter (IMC) is a modern power generation system that enables a direct ac/ac conversion without the need for any bulky and limited lifetime electrolytic capacitor. This system also allows four-quadrant operation, generation of sinusoidal output voltage waveforms with variable frequency and amplitude, and control of input power factor. This study proposes a pulse-width modulation-based sliding-mode controller to achieve unity input-power factor operation of the IMC independently of the active power exchanged with the grid, as well as a fast dynamic response. The designed equivalent control law determines, at each sampling period, the appropriate q-axis component of the modulated input current to be injected into the grid through the LC input filter. An integral term of the error is included in the expression of the sliding surface to increase the accuracy of the control method. A double space vector modulation method is used to synthesize the direction of the space vector of the input currents as required by the sliding-mode controller and the space vectors of the target output voltages. Simulation and experimental results are provided to show the effectiveness and evaluate the performance of the proposed control method.
Extensive Acute Lower Extremity Arterial Thrombosis: A Major Thrombus Formation Caused by COVID-19
Pouya Tayebi,Mahmoud Sadeghi Haddad Zavareh,Gooya Tayyebi,Fatemeh Zahra Abdollahi,Fatemeh Mahmoudlou 대한혈관외과학회 2021 Vascular Specialist International Vol.37 No.4
Acute thromboembolic events have been frequently reported in patients with coronavirus disease 2019 (COVID-19) due to an increase in the coagulation system activity and endothelial dysfunction. This report describes a patient with COVID-19 who initially reported respiratory symptoms and developed acute lower limb ischemia secondary to extensive macrovascular arterial thrombosis, which was treated with thrombectomy. The development of such extensive arterial thrombosis with anticoagulants at therapeutic doses is a new sign of increased viral pathogenicity, and it is necessary to develop and apply updated prophylaxis protocols for thrombosis in these patients.
Rmili, Lazhar,Hamouda, Mahmoud,Rahmani, Salem,Blanchette, Handy Fortin,Al-Haddad, Kamal The Korean Institute of Power Electronics 2017 JOURNAL OF POWER ELECTRONICS Vol.17 No.4
An indirect matrix converter (IMC) is a modern power generation system that enables a direct ac/ac conversion without the need for any bulky and limited lifetime electrolytic capacitor. This system also allows four-quadrant operation, generation of sinusoidal output voltage waveforms with variable frequency and amplitude, and control of input power factor. This study proposes a pulse-width modulation-based sliding-mode controller to achieve unity input-power factor operation of the IMC independently of the active power exchanged with the grid, as well as a fast dynamic response. The designed equivalent control law determines, at each sampling period, the appropriate q-axis component of the modulated input current to be injected into the grid through the LC input filter. An integral term of the error is included in the expression of the sliding surface to increase the accuracy of the control method. A double space vector modulation method is used to synthesize the direction of the space vector of the input currents as required by the sliding-mode controller and the space vectors of the target output voltages. Simulation and experimental results are provided to show the effectiveness and evaluate the performance of the proposed control method.
THE GENERAL ANNUITY CASE OF TIME VALUE OF MONEY: A PEDAGOGICAL APPROACH
Omar M Benkato,Mahmoud M Haddad,Michael N Baur,H Banarjee Rau People&Global Business Association 1996 Global Business and Finance Review Vol.1 No.2
Most finance and related textbooks implicitly assume -in the case of annuity- that the frequency of compounding and the number of payments per year are equal. In this paper; we provide more accurate general equations that permit the equality and the inequality of the number of compounding periods and the number of payments per year. The correct formulation is beneficial to practitioners, regulators and software developers working with annuities because the correct formulas are important in applications related to capital budgeting, pension funds, bond valuation, and bond portfolio immunization.