共查询到20条相似文献,搜索用时 15 毫秒
1.
The structure of radio‐frequency (rf) discharges in N2 is examined for the electrons and positive ions, in which electron–neutral collisions and ion–neutral collisions are taken into consideration. Some detailed properties of rf plasmas sustained by an rf source voltage of 13.56 MHz and an amplitude of 200 V are presented using Monte Carlo simulation in electropositive gas (N2). It is shown that most of the rf external electric field is absorbed in the sheath regions, whereas electrons respond easily to the oscillating rf electric field, ions cannot oscillate with the rf electric field. The oscillations of the electron cloud determine the instantaneous sheath thickness near each electrode. The mean energy and the density of charged particles are also discussed. Copyright © 2010 John Wiley & Sons, Ltd. 相似文献
2.
A. G. Bakirtzis Yong-Ha Kim A. P. Sakis Meliopoulos 《Electric Power Systems Research》2002,60(3):137-144
A Monte Carlo simulation method for evaluating retail-wheeling effects on power systems is formulated and solution methods are presented. The effects of wheeling on operating cost, transmission losses, and system security are considered. For a specific operating condition, the effects are quantified by the sensitivity of specific quantities of interest with respect to power wheeling level. Quantities of interest are total operating cost, transmission losses and security, which is quantified with several indices. This model is utilized within a Monte Carlo simulation to calculate probability distribution functions of the incremental effects of wheeling on operating cost, transmission losses, and system security. The model and solution methods are applied on an example power system and the results are presented. 相似文献
3.
Mohammad M. Fakharian Pejman Rezaei Ali Shahzadi 《International Journal of Numerical Modelling》2016,29(5):1015-1023
In this paper, Monte Carlo (MC) simulation has been applied for the analysis and stochastic calculus of far‐field radiation from the small, large, and infinite open‐ended waveguide arrays. Elements of the arrays are excited by the fundamental TE10 mode and with equal amplitude and linear phase. The simulated results from MC are compared closely with the finite element method (FEM). Numerical analysis based on FEM is performed using Ansoft High Frequency Structural Simulator to calculate the far‐field radiation characteristics of the arrays. The accuracy and the effectiveness of the aforesaid method, which is based on Monte Carlo integration technique, are also demonstrated in uniformly and nonuniformly spaced waveguide arrays for pattern synthesis or achieving side lobe level reduction. The arrays with arbitrary shapes are simply evaluated by MC method in equal spacing array. It is found that by applying MC simulation, the open‐ended waveguide arrays have the ability to produce the desired radiation pattern and could satisfy requirements for many applications. Copyright © 2016 John Wiley & Sons, Ltd. 相似文献
4.
Sunu Wibirama Supan Tungjitkusolmun Chuchart Pintavirooj 《IEEJ Transactions on Electrical and Electronic Engineering》2013,8(3):238-246
In this paper, we suggest a new approach for accurate measurement of three‐dimensional eye movements employing dual‐camera acquisition. Two calibrated mini CCD cameras are used to capture two simultaneous images of one eye. Center‐of‐mass and template‐matching algorithms are utilized to obtain two‐dimensional coordinates of the center of pupil and iris striation. Instead of asking each subject to fulfill intricate calibration steps, a novel and simpler technique to solve geometric distortion is presented by utilizing direct linear transformation (DLT) algorithm which requires only one preliminary calibration procedure for each camera without changing any camera installation. The DLT algorithm is then used to extract three‐dimensional coordinates of the center of the pupil and iris striation from prior two‐dimensional coordinates, allowing the three‐dimensional angular positions of the eye to be computed. Real‐time eyeball visualization based on tracking results is incorporated to help clinicians diagnose eye movements. Experimental results show that our system has high accuracy, as the average errors in the horizontal, vertical, and torsional angular positions were confined to 0.15°, 0.14°, and 0.20°, respectively. Real‐time implementation demonstrates that our system can be used in clinical routines to observe either voluntary or involuntary human eye movements. © 2013 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc. 相似文献
5.
Evgenij Starikov Pavel Shiktorov Viktoras Gružinskis Alexandr Dubinov Vladimir Aleshkin Luca Varani Christophe Palermo Lino Reggiani 《Journal of Computational Electronics》2007,6(1-3):45-48
A possibility to develop the so called TASER (Terahertz-Amplification-by-the-Stimulated-Emission-of- Radiation) by using two-dimensional
(2D) electron transport in quantum well (QW) structures is investigated by Monte Carlo simulation of the optical-phonon-emission
assisted transit-time resonance (OPTTR) of 2D electrons in momentum space under the low lattice temperature. A considerable
extension of the frequency region for THz radiation generation (upto 5 times) when going from 3D- to 2D-case is predicted. 相似文献
6.
We investigate a quantum-correction method for Monte Carlo device simulation. The method consists of reproducing quantum mechanical
density-gradient simulation by classical drift-diffusion simulation with modified effective oxide thickness and work function
and using these modifications subsequently in Monte Carlo simulation. This approach is found to be highly accurate and can
be used fully automatically in a technology computer-aided design (TCAD) workbench project. As an example, the methodology
is applied to the Monte Carlo simulation of the on-current scaling in p- and n-type MOSFETs corresponding to a 65 nm node technology. In particular, it turns out that considering only the total threshold
voltage shift still involves a significant difference to a Monte Carlo simulation based on the combined correction of oxide
thickness and work function. Ultimately, this quantum correction permits to consider surface scattering as a combination of
specular and diffusive scattering where the conservation of energy and parallel wave vector in the specular part takes stress-induced
band structure modifications and hence the corresponding surface mobility changes on a physical basis into account. 相似文献
7.
8.
Masaki Samejima Masanori Akiyoshi Koshichiro Mitsukuni Norihisa Komoda 《Electrical Engineering in Japan》2010,170(3):9-18
We propose a business scenario evaluation method using a qualitative/quantitative hybrid model. In order to evaluate business factors with qualitative causal relations, we introduce statistical values based on propagation and combination of effects of business factors by Monte Carlo simulation. In propagating an effect, we divide a range of each factor by landmarks and decide an effect to a destination node based on the divided ranges. In combining effects, we determine an effect of each arc using contribution degree and sum all effects. Through applied results to practical models, it is confirmed that there are no differences between results obtained by quantitative relations and results obtained by the proposed method at the risk rate of 5%. © 2009 Wiley Periodicals, Inc. Electr Eng Jpn, 170(3): 9–18, 2010; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.20950 相似文献
9.
Shunsaku Otsuki Kazuaki Yamazawa Hisanao Yamashita 《Electrical Engineering in Japan》1999,128(4):9-15
This paper presents a new method which visualizes the high‐speed three‐dimensional images of prebreakdown streamers in dielectric liquids. A new optical system, having two crossed light axes to observe the needle tip from different directions, was designed. The shadowgraphic images from these two directions were combined through a beam splitter and focused on the photo‐cathode of an image converter camera. The photograph taken by this high‐speed shadowgraph system was reconstructed to three‐dimensional images using an image scanner and a computer. Using this system, the growth and decay processes of the streamer in cyclohexane were investigated. © 1999 Scripta Technica, Electr Eng Jpn, 128(4): 9–15, 1999 相似文献
10.
Christian Jirauschek Giuseppe Scarpa Paolo Lugli Maurizio Manenti 《Journal of Computational Electronics》2007,6(1-3):267-270
We report on Monte Carlo (MC) simulations aimed at the design and optimization of GaAs-based THz quantum cascade lasers. Results
are presented for a GaAs/Al0.15Ga0.85As quantum cascade laser design based on LO phonon scattering depopulation, which operates at 2.8 THz. The obtained electron
distribution functions in the subbands and the photoluminescence spectra are compared to experimental results. Also the dependence
of the inversion and current density on the applied field is investigated, and the parasitic channels are identified based
on the intersubband lifetimes. 相似文献
11.
Adaptive boundary control for flexible three‐dimensional Euler‐Bernoulli beam with input signal quantization 下载免费PDF全文
Ning Ji Jinkun Liu 《International Journal of Adaptive Control and Signal Processing》2018,32(8):1162-1181
This paper proposes an adaptive boundary control scheme for the flexible three‐dimensional Euler‐Bernoulli beam with input signal quantization. Considering the coupling effect between the axial deformation and the transverse displacement, the dynamics of the flexible system are represented by partial differential equations and ordinary differential equations. Input signals in modern control systems are often quantized before being transmitted through communication channels in technology engineering. Logarithmic quantitative controllers are designed to suppress the vibration of the beam. It is proved that the proposed control scheme can be guaranteed in handling the vibration of the beam and input signal quantization simultaneously. Finally, numerical simulations illustrate the effectiveness of the results. 相似文献
12.
Saki Kondo Yoshiaki Ukita Kuniyo Fujiwara Yuichi Utsumi 《Electrical Engineering in Japan》2011,177(1):26-31
A novel micromixer was proposed, fabricated and verified. The new concept of the micromixer is to cross‐link many capillaries in a three‐dimensional structure. The characteristic flow behaviors were simulated by using the “FLUENT” computational fluid dynamics (CFD) software. The results of the CFD showed unique mixing behavior in three‐dimensionally cross‐linked capillaries. The mixing performance of the micromixer is strongly influenced by controlling the three‐dimensional crossing conditions. The micromixer was fabricated by deep X‐ray lithography with multistep exposure. The cross‐linked capillary structures were successfully fabricated while controlling the cross‐link conditions. The performance of the micromixer was evaluated by using an enzyme reaction. By comparing the mixtures produced with a cross‐linked fluid filter and with a fluid filter without cross‐linked capillaries, we found that the reaction was accelerated by using the new micromixer. © 2011 Wiley Periodicals, Inc. Electr Eng Jpn, 177(1): 26–31, 2011; Published online in Wiley Online Library ( wileyonlinelibrary.com ). DOI 10.1002/eej.21157 相似文献
13.
针对已有的单次校准结论风险,计量实验室更加需要总体校准结论风险来分析测量仪器的校准状态,提出将蒙特卡罗仿真方法应用于校准结论的风险分析中。通过对单次校准结论的风险分析得出影响误判率的参数;进而通过蒙特卡罗仿真法分析总体校准结论,结果显示,提高测量不确定度比一倍,误判率下降120%。最后,结合仿真过程建立总体校准风险的模型,通过分析总体校准结论的风险,提出可以降低错误判断风险的概率的方法,对校准工作具有一定的理论指导价值。 相似文献
14.
J. Saint-Martin A. Bournel V. Aubry-Fortuna F. Monsef C. Chassat P. Dollfus 《Journal of Computational Electronics》2006,5(4):439-442
A new two-dimensional self-consistent Monte-Carlo simulator including the multi sub-band transport in a 2D electron gas is
described and applied to an ultra-thin Double Gate MOSFET. This approach takes into account both out of equilibrium transport
and quantization effects. This method improves significantly microscopic insight into the operation of deep sub-100 nm CMOS
devices. We analyze the ballistic, quantization and roughness effects in a 12 nm-long DGMOS transistor. In particular, we
focus on the link between non-stationary transport and the evolution of sub-band occupancy along the channel. 相似文献
15.
Haifeng GeAuthor Vitae 《Electric Power Systems Research》2011,81(2):347-356
An algorithm for reliability simulation of equipment and systems using a parallel computing environment is developed. A sequential Monte Carlo simulation-based method is applied for generating reliability and maintainability history charts for equipment, from which the reliability indices, as well as their probability distributions, are calculated. A parallel methodology is developed to discretize the simulation into periods, and the simulation of individual periods is dispatched to different processors for efficient computing. Case studies utilizing the proposed method for reliability evaluation of equipment and simple systems are presented. Simulation results are compared with the analytical approach results for the same cases. The study provides the basis for using a parallel computing environment in power system reliability and cost evaluations. The environment used in this paper is Rock-131 from the San Diego Supercomputer Center in La Jolla, CA. 相似文献
16.
Hayato Izumi Seiji Aoyagi 《IEEJ Transactions on Electrical and Electronic Engineering》2007,2(3):328-334
This paper proposes a novel fabrication method for long solid microneedles made of silicon, which have a three‐dimensional sharp tip, by using isotropic dry etching. Since the fabrication is done in a direction parallel to the surface of the silicon substrate, there is no limit for the needle length. Also, the shank shape of this needle is freely designed three‐dimensionally by defining the mask on the silicon surface. For example, a jagged or harpoon shape is possible by using the proposed method, which may be effective for some medical applications. First, several three‐dimensional, complicated‐shaped needles with sharp tip angles were fabricated by changing the mask pattern. Second, a penetration experiment with them on an artificial skin was carried out, and easy penetration comparable with a conventional metal solid needle was confirmed. For an example of lancet application for diabetics, one of the needles was inserted into a human skin, and bleeding was confirmed. Copyright © 2007 Institute of Electrical Engineers of Japan© 2007 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc. 相似文献
17.
Barry Zorman Santhosh Krishnan Dragica Vasileska Jialei Xu Mark Van Schilfgaarde 《Journal of Computational Electronics》2004,3(3-4):351-354
We present an ab-inito band-structure approach that can be applied for holes in Monte Carlo simulations of strained SiGe channel devices in order to remove the uncertainties of alloy scattering parameters along with addressing the effects of strain. 相似文献
18.
Takayuki Yamanaka Mitra Dutta Michael Stroscio 《Journal of Computational Electronics》2008,7(3):252-255
Charge transport characteristics in a double-stranded DNA are discussed. Based on the polaron drift model, DNA was modeled
as a 1D quantum wire. The phonon scattering rates were calculated by deformation potential theory, and the carrier dynamics
in DNA were simulated by the Monte Carlo technique. The simulation result shows a rapid charge transport from the initial
point. Lastly, the validity of the modeling is discussed. 相似文献
19.
C. Sampedro F. Gámiz A. Godoy F. Jiménez-Molinos 《Journal of Computational Electronics》2007,6(1-3):41-44
A Quantum Ensemble Monte Carlo (QEMC) simulator is used to calculate electrical characteristics and transient response of
actual nanotransistors: both sub-50 nm CMOS N-MOSFETs and ultrathin double gate SOI transistors have been deeply studied.
Doping profiles and oxide thickness have been selected to cope with the available specifications of the ITRS Roadmap. The
Quantum corrected Ensemble Monte Carlo simulator (QEMC) has been used to self-consistently solve the Boltzmann Transport and
Poisson equations in actual devices. Quantum effects are included through the Multi-Valley Effective Conduction Band Edge
(MV-ECBE) technique, and adequate approaches for phonon and surface roughness scattering have been developed to include the
effects of carrier quantization in pseudo-2DEG simulations. 相似文献
20.
J. Branlard S. J. Aboud S. M. Goodnick M. Saraniti 《Journal of Computational Electronics》2004,3(3-4):323-327
Data compression techniques aimed to the reduction of the memory usage of the Cellular Monte Carlo (CMC) approach are presented in this work. Two approaches have been investigated and implemented, resulting in memory savings of 25 and 50% of computer random access memory (RAM). The loss of precision due to the proposed techniques is measured, and its consequences are studied. The validity and accuracy of the results obtained with compression is verified and robustness is tested on various semiconductor materials. Some applications of the proposed approach are discussed as well. 相似文献