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2018 International Conference on Communications and Electrical Engineering (ICCEE)最新文献

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Optimization of GaAs 1-x Px/Si Tandem Dual-Junction Solar Cells GaAs 1-x Px/Si串联双结太阳能电池的优化
Pub Date : 2018-12-01 DOI: 10.1109/CCEE.2018.8634480
A. B. Azzououm, A. Aissat, F. Benyettou, J. Vilcot
In order to attest the feasibility and the concept of great-quality III – V devices, we focus our actual work on the developming of a tandem dual-junction solar cell, including a GaAS1−xPx top cell and a Si bottom cell. A simulation study of the top cell was performed. The impact of GaAS1−xPx absorber layer thicknesses, the temperature, and P composition x on cell efficiency are evidenced. In these structures, a tunnel junction was needed to interconnecting both the bottom and top cell. We comparing the simulated performance of two tunnel junction structure and we will show that the use of the GaAs (n+)/GaAs (p+) tunnel junction improve the performance of the currentvoltage characteristics. An optimal efficiency of about 16.27% was obtained with a thickness of about 1–m, P fraction x=0.37 and a temperature of 285 K.
为了验证高质量III - V器件的可行性和概念,我们将实际工作重点放在串联双结太阳能电池的开发上,包括GaAS1−xPx顶部电池和Si底部电池。对顶槽进行了仿真研究。研究了GaAS1−xPx吸收层厚度、温度和P成分对电池效率的影响。在这些结构中,需要一个隧道连接点来连接底部和顶部细胞。我们比较了两种隧道结结构的模拟性能,我们将证明使用GaAs (n+)/GaAs (p+)隧道结改善了电流电压特性的性能。当膜厚约为1 m, P分数x=0.37,温度为285 K时,效率最高,约为16.27%。
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引用次数: 1
A Theoretical Characterization of the Coupling Effects of Frequency and Mechanical Stresses on the Magnetic Properties of the Ferromagnetic Material 频率和机械应力对铁磁材料磁性能耦合效应的理论表征
Pub Date : 2018-12-01 DOI: 10.1109/CCEE.2018.8634436
Yakhlef Malika, B. Sebti, B. Adel
The topic of the paper is to model simultaneously, the effect of frequency coupled with applied mechanical stresses, on the magnetic hysteresis of ferromagnetic sheets. The magneto-mechanical model to be exploited is deduced from the classical effective field intended by Sablik-Jiles-Atherthon (S.J.A.). The previous relationship has been adjusted by introducing the parameter which takes into account the internal reaction of the material subjected to external mechanical stress. The corresponding phenomenon is not considering in literature, it will be noted stress demagnetizing field. Different magnetic characteristics are plotted by applying the proposed model. Thus, the model is validated through extensive simulations and compared with ones obtained experimentally in literature. A reasonable trend has been reached.
本文的主题是同时模拟频率和外加机械应力对铁磁片磁滞的影响。利用sablikk - jiles - atherthon (S.J.A.)提出的经典有效场推导出磁力模型。通过引入考虑到材料在外部机械应力作用下的内部反应的参数,对先前的关系进行了调整。文献中没有考虑到相应的现象,会注意到应力退磁。应用该模型绘制了不同的磁特性。因此,通过大量的模拟验证了该模型,并与文献中实验得到的模型进行了比较。一个合理的趋势已经形成。
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引用次数: 0
Subspace Approach for Enhancing Speech based on SVD. 基于SVD的语音增强子空间方法。
Pub Date : 2018-12-01 DOI: 10.1109/CCEE.2018.8634498
Ajgou Riadh, S. Salim, Hettiri Massaoud, Guettal Lemya, Ghendir Said, Bessous Noureddine, Chemsa Ali
In this work, we have developed an improved approach for enhancing speech corrupted by additive white Gaussian noise. An efficient denoising approach based on singular value decomposition (SVD) and Savistky-golay filter is proposed to reduce the White Gaussian noise (WGN). In order to filter singular values (SV) that represent original speech signal, we have proposed an efficient threshold algorithm. The whole SV are extracted from Hankel matrices in the overlapping speech window frames. After selecting dominant SV by our efficient threshold, the inverse operation is performed to create the new Hankel matrices and regrouping frames to reconstruct the enhanced signal (original signal), the denoised signal is smoothed using the Savitzky-Golay filter. The proposed approach offers an improved performance of speech enhancement comparing with traditional methods in terms of Perceptual Evaluation of Speech Quality scores measure (PESQ) and segmental SNR (SegSNR). A good yield of the method is observed for the SNR values between −10 and 30 dB.
在这项工作中,我们开发了一种改进的方法来增强被加性高斯白噪声破坏的语音。提出了一种基于奇异值分解(SVD)和savstky -golay滤波器的高斯白噪声降噪方法。为了过滤代表原始语音信号的奇异值(SV),提出了一种高效的阈值算法。在重叠的语音窗口框中,从Hankel矩阵中提取整个SV。通过有效阈值选择优势SV后,进行逆运算创建新的Hankel矩阵并重组帧以重建增强信号(原始信号),然后使用Savitzky-Golay滤波器对去噪信号进行平滑处理。与传统的语音增强方法相比,该方法在语音质量分数感知评价(PESQ)和分段信噪比(SegSNR)方面有了改进。在信噪比为- 10 ~ 30db的情况下,该方法的良率较高。
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引用次数: 0
Combining Second Order Central Difference Discretization with Extended Kalman Filter for Rotor Speed and Flux Estimation of a Doubly-fed Induction Generator 结合二阶中心差分离散和扩展卡尔曼滤波的双馈感应发电机转子转速和磁链估计
Pub Date : 2018-12-01 DOI: 10.1109/CCEE.2018.8634518
A. Boussoufa, M. Kidouche
This paper combines second order central difference discretization method with Extended Kalman Filter (EKF) in order to estimate the rotor speed and flux of a Doubly-Fed Induction Generator (DFIG). A second order discretization yields to a multistep numerical integration method which is known to have better accuracy than single step Euler method. Extended Kalman Filter (EKF) is widely used to estimate the dynamic states of nonlinear system. Usually, a 1st order discretization of the nonlinear system is used with Forward-Euler scheme to obtain a discrete state-space representation, however in this paper, we will combine a second order discretization schemes with EKF in an attempt to get a better estimation of the rotor speed and flux of a DFIG which is widely used in Wind Turbines (WTs). A DFIG modeling in the (dq) reference frame is presented and a description of proposed EKF algorithm is described to estimate the rotor speed and flux. Simulation results are shown and discussed
本文将二阶中心差分离散化方法与扩展卡尔曼滤波(EKF)相结合,用于双馈感应发电机(DFIG)转子转速和磁链的估计。二阶离散化产生的多步数值积分法比单步欧拉法具有更好的精度。扩展卡尔曼滤波(EKF)被广泛用于估计非线性系统的动态状态。通常,非线性系统的一阶离散化采用前向欧拉格式来获得离散状态空间表示,然而,本文将二阶离散化与EKF相结合,试图更好地估计风力发电机中广泛使用的DFIG的转子转速和磁通。提出了在(dq)参考系下的DFIG模型,并描述了用于估计转子转速和磁链的EKF算法。给出了仿真结果并进行了讨论
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引用次数: 0
The effect of introduction of HfO2 on the electrical characterization of the Pt/HfO2/n-GaN 引入HfO2对Pt/HfO2/n-GaN电学特性的影响
Pub Date : 2018-12-01 DOI: 10.1109/CCEE.2018.8634446
A. Sadoun, S. Mansouri, M. Chellali, A. Hima, Z. Benamara
In this paper is presented a theoretical study of effects of Hafnium dioxide on the electrical properties of (Pd/n-GaN) Schottky diode under a temperature of 300°K, using the forward bias I-V measurements. A simulation on the (Pd/n-GaN) and (Pd/HfO2/n-GaN) structure is presented, then simulation results are compared with experimental results. A well matching was found between simulations and experimental results. Barrier height (Φb), ideality factor (n) and series resistance (Rs) effects was also studied. In addition, (I-V), Norde, Cheung and Cheung, H(I) and G(I), Chattopadhyay and Mikhelashvili methods are used to extract different parameters. Obtained theoritical results are well matched with experimental measurements. The ATLAS module of SILVACO-TCAD software has been used in numeric simulations.
在300°K温度下,利用正偏I-V测量方法,研究了二氧化铪对(Pd/n-GaN)肖特基二极管电学性能的影响。对(Pd/n-GaN)和(Pd/HfO2/n-GaN)结构进行了仿真,并将仿真结果与实验结果进行了比较。模拟结果与实验结果吻合较好。还研究了屏障高度(Φb)、理想因子(n)和串联电阻(Rs)的影响。此外,还采用(I- v)、Norde、Cheung and Cheung、H(I) and G(I)、Chattopadhyay和Mikhelashvili方法提取不同参数。所得理论结果与实验结果吻合较好。利用SILVACO-TCAD软件中的ATLAS模块进行了数值模拟。
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引用次数: 2
Physical Implementation of Cosine Function Used in the Hamming Window 余弦函数在汉明窗口中的物理实现
Pub Date : 2018-12-01 DOI: 10.1109/CCEE.2018.8634527
N. Tahir, M. Boudraa
This work addresses the issue related to the study of cosine function implementation using the principle of content addressable memory. This latter is very compatible for certain critical applications compared to the polynomial and the rational approximations as well as the Look up Table based solution. This implementation will be used in hamming window for computing Mel-frequency cepstral coefficients for speech recognition applications.
这项工作解决了与使用内容可寻址存储器原理研究余弦函数实现相关的问题。与多项式和有理近似以及基于查找表的解决方案相比,后者对于某些关键应用非常兼容。该实现将用于汉明窗计算mel频率倒谱系数的语音识别应用。
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引用次数: 2
In0.53 Ga 0.47 As Triangular GAA MOSFETs In0.53 Ga 0.47 As三角形GAA mosfet
Pub Date : 2018-12-01 DOI: 10.1109/CCEE.2018.8634443
M. Khaouani, Z. Kourdi
Triangular GAA MOSFETs (gate-all-around metal oxide semiconductor) with III-V material in channel has been simulated by Atlas Tcad-Silvaco software, we has used for obtain DC, AC characteristics analysis. Those devices provide superior electrostatic control of channel, A different performance (gm, DIBL, ION/IOFF) with 14 nm channel length viewing the impunity to short channel effects with 3D advanced structure that we got gm=178 ms/mm at VDS =0.25V, a reasonable ratio ION/IOFF of 5.1 * 104, sub-threshold sweep (SS) equal to 135 mV/dec, DIBL =40 mV/V drain induced barrier lowering (DIBL) and finally a cut-off frequency of fC=800 GHz, the III-V GAA MOSFETs structures has provided a achievable path around optimal scaling of this devices.
利用Atlas Tcad-Silvaco软件对沟道中III-V型材料的三角形GAA mosfet(栅极全金属氧化物半导体)进行了仿真,并对其进行了直流、交流特性分析。这些器件提供了优越的通道静电控制,在14 nm通道长度下具有不同的性能(gm, DIBL, ION/IOFF),观察3D先进结构对短通道效应的影响,我们得到了VDS =0.25V时gm=178 ms/mm,合理的ION/IOFF比为5.1 * 104,亚阈值扫描(SS)等于135 mV/dec, DIBL =40 mV/V漏极诱导阻挡降低(DIBL),最后截止频率为fC=800 GHz。III-V GAA mosfet结构为该器件的最佳缩放提供了可实现的路径。
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引用次数: 0
The importance of using dual channel heterostructure in strained P-MOSFETs 在应变p - mosfet中使用双通道异质结构的重要性
Pub Date : 2018-12-01 DOI: 10.1109/CCEE.2018.8634492
Amine Mohammed Taberkit, A. Guen-Bouazza, Mohamed Horch
We present in this work a dual channel heterostructure strained structure, introduce the high carrier mobility Awaited in heterostructure devices while using several models which are: CVT, SHIRAHATA and WATT, we present a two dimensional simulation of dual strained channel heterostructure P-MOSFETs. This study is accomplished using SILVACO-TCAD simulation software, the comparison of the effect of using strain technique on P-MOSFET transistors will demonstrate the importance of using strain technique especially in dual channel heterostructure MOSFET. The simulation of fabrication steps and the extraction of the electronic proprieties in terms of transfer and output characteristics, transconductance, and the quasi-static capacitance allow understanding and interpreting these enhancements.
本文提出了一种双通道异质结构应变结构,介绍了异质结构器件中期待的高载流子迁移率,并利用CVT、SHIRAHATA和WATT模型对双应变通道异质结构p - mosfet进行了二维仿真。本研究是利用SILVACO-TCAD仿真软件完成的,通过对应变技术在p型MOSFET晶体管上的应用效果的比较,可以说明应变技术在双沟道异质结构MOSFET中的重要性。制造步骤的模拟和电子特性的提取在转移和输出特性、跨导和准静态电容方面允许理解和解释这些增强。
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引用次数: 2
Effect of CuBi2O4 additive on dielectric, ferroelectric, and piezoelectric properties of BCTZ lead free ceramics sintered at low temperature CuBi2O4添加剂对低温烧结BCTZ无铅陶瓷介电、铁电和压电性能的影响
Pub Date : 2018-12-01 DOI: 10.1109/CCEE.2018.8634536
N. Zidi, A. Chaouchi, M. Rguiti, C. Courtois, Y. Lorgouilloux
The influence of CuBi2O4 addition on sintering temperature, structural, dielectric and piezoelectric properties of (Ba, Ca)(Ti, Zr)O3 BCTZ ceramics prepared by the direct solid-state reaction were investigated. The X ray diffraction (XRD) data showed a single phase perovskite structure with morphotropic phase for all samples. The scanning electron microscopy observation showed the formation of glass phase in BCTZ doped compositions, which explain the reducing in sintering temperatures. The CuBi2O4 addition decrease the rhomboedral–tetragonal transition temperature and slightly increase Curie temperature. Ferroelectric measurements show that remanent polarisation (P r), and the coercive field of ceramics firstly increases and then decreases with further increasing the CuBi2O4 content. The dielectric behavior of all samples exhibited diffuse phase transition behaviour. Samples of the BCTZ ceramics modified with 0.08% of CuBi2O4 exhibited the highest density (5.39 g/cm3), the highest dielectric constant (εr=10566.) and the best piezoelectric constant (d33 = 320 pC/N)
研究了CuBi2O4添加量对直接固相反应制备的(Ba, Ca)(Ti, Zr)O3 BCTZ陶瓷烧结温度、结构、介电和压电性能的影响。X射线衍射(XRD)结果表明,所有样品均为单相钙钛矿结构。扫描电镜观察发现,掺杂BCTZ的组分形成了玻璃相,这是烧结温度降低的原因。CuBi2O4的加入降低了正四边形转变温度,略微提高了居里温度。铁电测量结果表明,随着CuBi2O4含量的进一步增加,陶瓷的剩余极化(P r)和矫顽力场先增大后减小。所有样品的介电行为均表现为扩散相变行为。0.08% CuBi2O4改性的BCTZ陶瓷样品密度最高(5.39 g/cm3),介电常数最高(εr=10566.),压电常数最佳(d33 = 320 pC/N)。
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引用次数: 0
Design and implementation of three-dimensional space vector modulation for three-phase four-leg inverter based on FPGA 基于FPGA的三相四脚逆变器三维空间矢量调制设计与实现
Pub Date : 2018-12-01 DOI: 10.1109/ccee.2018.8634452
Othmane mellati, Said Saidat, M. Bouzidi, S. Barkat
The four-leg inverter presents a best topology for inverters operating in four-wire distribution systems. The goal of this work is to design circuit to control the three-phase four-leg inverter using three-dimensional space vector modulation. The implementation is performed on Zynq 7000 FPGA board based on hardware description language. XILINX FPGA presents a very high level fixable design/simulation tool named Xilinx ISE, which makes us able to test, change and correct the high level structural description design quickly.
四腿逆变器为四线制配电系统中的逆变器提供了最佳的拓扑结构。本文的目的是设计一种利用三维空间矢量调制控制三相四脚逆变器的电路。基于硬件描述语言在zynq7000 FPGA板上实现。XILINX FPGA提供了一个非常高级的可固定设计/仿真工具,名为XILINX ISE,它使我们能够快速测试,更改和纠正高级结构描述设计。
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引用次数: 0
期刊
2018 International Conference on Communications and Electrical Engineering (ICCEE)
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