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排序方式: 共有168条查询结果,搜索用时 15 毫秒
1.
Kiani Azaz Ahmed Hafeez Yaser Imran Muhammad Ali Sadia 《The Journal of supercomputing》2021,77(8):8391-8432
The Journal of Supercomputing - Agile software development (ASD) and software product line (SPL) have shown significant benefits for software engineering processes and practices. Although both... 相似文献
2.
In this paper, metamodeling and five well-known metaheuristic optimization algorithms were used to reduce the weight and improve crash and NVH attributes of a vehicle simultaneously. A high-fidelity full vehicle model is used to analyze peak acceleration, intrusion and component’s internal-energy under Full-Frontal, Offset-Frontal, and Side crash scenarios as well as vehicle natural frequencies. The radial basis functions method is used to approximate the structural responses. A nonlinear surrogate-based mass minimization was formulated and solved by five different optimization algorithms under crash-vibration constraints. The performance of these algorithms is investigated and discussed. 相似文献
3.
Testing Forecast Accuracy of Foreign Exchange Rates: Predictions from Feed Forward and Various Recurrent Neural Network Architectures 总被引:3,自引:1,他引:2
In this research, we work with data of futures contracts on foreign exchange rates for British pound (BP), Canadian dollar
(CD), and Japanese yen (JY) that are traded at the Chicago Mercantile Exchange (CME) against US dollars. We model relationships
between exchange rates in these currencies using linear models, feed forward artificial neural networks (ANN), and three versions
of recurrent neural networks (RNN1, RNN2 and RNN3) for predicting exchange rates in these currencies against the US dollar.
Our results on forecast evaluations based on AGS test the tests of forecast equivalence between any two competing models among
the entire models employed for each of the series show that ANN and the three versions of RNN models offer superior forecasts
for predicting BP, CD and JY exchange rates although the forecast evaluations based on MGN test are in sharp contrast. On
the other hand forecast based on SIGN test shows that ANN and all the versions of RNN models offer superior forecasts for
BP and CD in exception of JY exchange rates. The results for forecast evaluation for all the models for each of the series
based on summary measures of forecast evaluations show that RNN3 model appears to offer the most accurate predictions of BP
and RNN1 for JP exchange rates. However, none of the RNN models appear to be statistically superior to the benchmark (i.e.,
linear model) for predicting CD exchange rates.
相似文献
4.
Keivan Kiani 《Journal of Mechanical Science and Technology》2014,28(9):3511-3516
Murmu et al. [23] recently presented a nonlocal model for the transverse vibration of simply supported graphene sheets in the presence of a unidirectional in-plane magnetic field. Further studies showed that the majority of Lorentz’s force components were improperly provided and led to invalid governing equations. To remove such deficiencies, the most general form of Lorentz’s force components is carefully extracted in the present work. The nonlocal equations of motion of the problem are reconstructed and solved again. The influences of crucial parameters on the flexural frequencies of magnetically affected graphene sheets and nanoribbons are examined in detail. Furthermore, the crucial discrepancies between the results obtained in this study and those of the abovementioned previous work are rationally discussed. Some erroneous results of the latter are also rectified. 相似文献
5.
Amirkianoosh Kiani Palneet Singh Waraich Krishnan Venkatakrishnan Bo Tan 《Nanoscale research letters》2012,7(1):518
In this work, we have proposed a concept for the generation of three-dimensional (3D) nanostructured metal alloys of immiscible materials induced by megahertz-frequency ultrafast laser pulses. A mixture of two microparticle materials (aluminum and nickel oxide) and nickel oxide microparticles coated onto an aluminum foil have been used in this study. After laser irradiation, three different types of nanostructure composites have been observed: aluminum embedded in nickel nuclei, agglomerated chain of aluminum and nickel nanoparticles, and finally, aluminum nanoparticles grown on nickel microparticles. In comparison with current nanofabrication methods which are used only for one-dimensional nanofabrication, this technique enables us to fabricate 3D nanostructured metal alloys of two or more nanoparticle materials with varied composite concentrations under various predetermined conditions. This technique can lead to promising solutions for the fabrication of 3D nanostructured metal alloys in applications such as fuel-cell energy generation and development of custom-designed, functionally graded biomaterials and biocomposites. 相似文献
6.
In this research, large amplitude free vibrations of a sandwich beam with stiff core and carbonnanotube (CNT)-reinforced face sheets are analysed. The distribution of CNTs across the thickness of the facesheets may be uniform or functionally graded. The equivalent single- layer theory of Timoshenko is used toconstruct the Hamiltonian of the beam under the von Kármán type of geometrical nonlinearity assumptions.A uniform temperature field through the beam is also included in the formulation. The Ritz method withpolynomial basis functions is used to discrete the equations of motion and establish the matrix representation ofthe governing equations. A nonlinear eigenvalue problem is obtained and solved using a standard continuationprocedure. After validating the developed solution method and formulation, parametric studies are conductedto examine the influences of thermal environment, core thickness-to-face sheet thickness ratio, boundaryconditions, amplitude of vibrations, CNTs volume fraction and their distribution pattern. It is concludedthat an increase in the volume fraction of CNTs results in higher fundamental frequency and decreases thenonlinear-to-linear frequency ratio. 相似文献
7.
An electrochemical approach to nanoporous film-based gold catalyst design using the underpotential deposition and redox replacement technique is presented. The procedure consisted of the underpotential deposition (UPD) of copper on the gold nanoporous film, with subsequent replacement of the copper by palladium at open circuit in a palladium containing solution. The resulting electrode was studied using cyclic voltammetry and scanning electron microscopy. The electrocatalytic activity of as-prepared palladium nanoporous gold film electrodes toward the oxygen reduction reaction is presented. 相似文献
8.
Yasser Kiani 《热应力杂志》2013,36(12):1495-1518
Based on the uncoupled thermoelasticity assumptions, axisymmetric thermally induced vibrations of a circular plate made of functionally graded materials (FGMs) are analyzed. Each thermomechanical property of the circular plate is assumed to be functions of temperature and thickness coordinate. Solution of the transient one-dimensional heat conduction equation with the arbitrary type of time-dependent boundary conditions is carried out employing the central finite difference method combined with the Crank–Nicolson time marching scheme. Afterwards, with the establishment of the associated Hamilton's principle and the accountancy of the von Kármán type of geometrical non-linearity, the motion equations are obtained with the aid of the conventional multi-term Ritz method. The solution of highly coupled non-linear motion equations is obtained utilizing a hybrid iterative Newton–Raphson–Newmark scheme. After validating the developed computer code, some parametric studies are accomplished to show the influences of various involved parameters. It is shown that temperature dependency, geometrical non-linearity, plate thickness, power law index, and the type of thermal in-plane and out-of-plane mechanical boundary conditions, all affect the temporal evolution of plate characteristics. 相似文献
9.
Mehdi Kiani M. Sharif Bakhtiar Mojtaba Atarodi 《Analog Integrated Circuits and Signal Processing》2010,62(3):319-325
This paper presents a low voltage low noise open loop automatic amplitude control method for voltage-controlled oscillators
(VCO’s). In this method a feedback mechanism keeps the VCO at its optimum amplitude over temperature and process variations
and then the loop is broken to avoid noise injection form the control circuitry to the VCO. The loop does not add extra noise
to the VCO. Based on the proposed method, a low voltage low noise LC-VCO was designed for a low phase noise application in
TSMC 0.18 micron RFCMOS technology. Simulations show considerable improvement in the phase noise with the application of the
proposed method. 相似文献
10.
Grapefruit juice is consumed widely in today's health conscious world as a protector against cardiovascular diseases and cancers.
It has however, been found to be an inhibitor of the intestinal cytochrome P – 450 3A4 system, which is responsible for the
first pass metabolism of many drugs. The P – glycoprotein pump, found in the brush border of the intestinal wall which transports
many of these cytochrome P – 450 3A4 substrates, has also been implicated to be inhibited by grapefruit juice. By inhibiting
these enzyme systems, grapefruit juice alters the pharmacokinetics of a variety of medications, leading to elevation of their
serum concentrations. Most notable are its effects on the calcium channel antagonist and the statin group of drugs. In the
case of many drugs, the increased serum concentration has been found to be associated with increased frequency of dose dependent
adverse effects. In this review, we have discussed the phytochemistry of grapefruit juice, the various drugs involved in the
drug – grapefruit juice eraction with their mechanisms of action and have presented the clinical implications of these interactions. 相似文献