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Namazi, S .,Sharif, H . 호남수학회 2000 호남수학학술지 Vol.22 No.1
An A-module M is catenary if for each pair of prime submodules K and L of M with K⊂L all saturated chains of prime submodules of M from K to L have a common finite length. We show that when A is a Noetherian doomain, then every finitely generated A-module is catenary if and only if A is a Dedekind domain or a field. Moreover, a torsion-free divisible A-module M is catenary if and only if the vector space M over Q(A) (the field of fractions of A) is finite dimensional.
Namazi, Mohammad Masoud,Saghaiannejad, Seyed Morteza,Rashidi, Amir,Ahn, Jin-Woo The Korean Institute of Electrical Engineers 2018 Journal of Electrical Engineering & Technology Vol.13 No.2
This paper presents a regenerative braking control scheme for Switched Reluctance Machine (SRM) drive in Electric Vehicles (EVs). The main purpose is to maximize the recovered energy during battery charging by taking into account the nonlinear physical characteristics of the Switched Reluctance Machine. The proposed regenerative braking method employs the back-EMF in the generation process as a complicated position-dependent voltage source. The proposed maximum power recovery (MPR) operation of the regenerative braking is first based on the maximization of the extracted power from the machine and then the maximization of the power transferred to the battery. The maximum power extraction (MPE) from SRM is based on maximizing the energy conversion ratio by the calculation of the optimum PWM switching duty cycle, turn-on, and turn-off angles. By using the impedance matching theorem that allows the maximum power transfer (MPT) of the MPE, the proposed MPR is achieved. The parametric averaged value modeling of the machine phase currents in the chopping control mode is used for MPR realization. By following this model, a nonlinear equivalent input resistance is derived for the battery internal resistance matching. The effectiveness of the proposed regenerative braking method is demonstrated through simulation results and experimental implementation.
NAMAZI, S.,SHARIF, H. The Honam Mathematical Society 2000 호남수학학술지 Vol.22 No.1
An A-module M is catenary if for each pair of prime submodules K and L of M with $K{\subset}L$ all saturated chains of prime submodules of M from K to L have a common finite length. We show that when A is a Noetherian domain, then every finitely generated A-module is catenary if and only if A is a Dedekind domain or a field. Moreover, a torsion-free divisible A-module M is catenary if and only if the vector space M over Q(A) (the field of fractions of A) is finite dimensional.
Adaptive Control of Switched Reluctance Motor Drives under Variable Torque Applications
Namazi, Mohammad Masoud,Rashidi, Amir,Koofigar, Hamidreza,Saghaiannejad, Seyed Morteza,Ahn, Jin-Woo The Korean Institute of Electrical Engineers 2017 Journal of Electrical Engineering & Technology Vol.12 No.1
This paper presents an adaptive control strategy for the speed control of a four-phase switched reluctance motor (SRM) in automotive applications. The main objective is to minimize the torque ripples, despite the unstructured uncertainties, time-varying parameters and external load disturbances. The bound of perturbations is not required to be known in the developing of the proposed adaptive-based control method. In order to achieve a smooth control effort, some properties are incorporated and the proposed control algorithm is constructed using the Lyapunov theorem where the closed-loop stability and robust tracking are ensured. The effectiveness of the proposed controller in rejecting high perturbed load torque with smooth control effort is verified with comparing of an adaptive sliding mode control (ASMC) and validated with experimental results.
Namazi, Abolfazl,Abedinzadeh, Maryam,Nourbaksh, Parisa,Neamatzadeh, Hossein Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.6
Background: Many studies have reported associations of the X-ray repair cross-complementing group 3 (XRCC3) Thr241Met polymorphism with colorectal cancer (CRC) risk, but the results remained controversial. Hence, we performed the present meta-analysis with different inheritance models. Materials and Methods: We searched the PubMed and Google scholar databases for studies relating to associations between XRCC3 Thr241Met polymorphism and risk of CRC. 16 studies with 5,193 cases and 6,645 controls were finally included into the meta-analysis. Results: We found that the XRCC3 Thr241Met polymorphism was associated with increased CRC risk only under a dominant genetic model (CC+CT vs. TT: OR 0.575, 95%CI 0.498-1.665, p<0.001, $P_{heterogeneity}=0.00$, $I^2=83%$). There was a significant association between XRCC3 Thr241Met polymorphism and CRC risk in Caucasian in the overall 8 studies under only in the heterozygote genetic model (CT vs. TT: OR=0.929, 95%CI =0.806-1.070, P=0.308, $P_{heterogeneity}=0.002$, $I^2=57%$). Four studies evaluated the XRCC3 Thr241Met polymorphism and CRC risk in Asians. Two genetic models of the XRCC3 polymorphism were significantly correlated with increasing risk in Asians (dominant model: CC+CT vs. TT: OR= 0.609, 95%CI=411-0.902, P=0.013, $P_{heterogeneity}=0.54$, $I^2=0.00%$; Allele model: C vs. T: OR=0.708, 95 %=CI 0.605-0.829, p=0.000, $P_{heterogeneity}=0.000$, $I^2=92%$). The sensitivity analysis suggested stability of this meta-analysis and no publication bias was detected. Conclusions: In conclusion, this meta-analysis indicates that XRCC3 Thr241Met shows an increased CRC risk, particularly in Asians rather than Caucasians.
N. Namazi,M. Alitavoli,H. Babaei 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.10
In this paper, an attempt was made to investigate the effects of dynamic loading rate on the properties of iron powder with afocus on the microstructural characteristics of the compacted material. Dynamic compaction tests were performed using aninstrumented die equipped with a load cell under the low loading rate ranging from 20 to 44 kN/ms in a drop hammer and thehigh loading rate ranging from 308 to 665 kN/ms in a one-stage light gas gun. Optical and scanning electron microscopes,diametric compression test, and Vickers hardness measurement were used to investigate microstructural and mechanicalproperties of the green compacts. The obtained results show that the range of loading rate completely changes the behavior ofthe powder by changing the number and velocity of the propagating stress waves. Comparison of the properties of specimenswith equivalent density compacted under two ranges of loading rates indicates that the high range significantly increasesthe strength and hardness, distributes stress and porosity more uniformly, and reduces initiation and growth of inter-particlecracks as well as the compaction force required to achieve a specific density.
Adaptive Control of Switched Reluctance Motor Drives under Variable Torque Applications
Mohammad Masoud Namazi,Amir Rashidi,Hamidreza Koofigar,Seyed Morteza Saghaiannejad,Jin-Woo Ahn 대한전기학회 2017 Journal of Electrical Engineering & Technology Vol.12 No.1
This paper presents an adaptive control strategy for the speed control of a four-phase switched reluctance motor (SRM) in automotive applications. The main objective is to minimize the torque ripples, despite the unstructured uncertainties, time-varying parameters and external load disturbances. The bound of perturbations is not required to be known in the developing of the proposed adaptive-based control method. In order to achieve a smooth control effort, some properties are incorporated and the proposed control algorithm is constructed using the Lyapunov theorem where the closed-loop stability and robust tracking are ensured. The effectiveness of the proposed controller in rejecting high perturbed load torque with smooth control effort is verified with comparing of an adaptive sliding mode control (ASMC) and validated with experimental results.