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2016 2nd International Conference on Electrical, Computer & Telecommunication Engineering (ICECTE)最新文献

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Design of a peripheral interface controller based MPPT charge controller 基于MPPT充电控制器的外设接口控制器设计
M. Rokonuzzaman, Mohammad Hossam-E-Haider
This paper presents a smart charge controller (SCC) that can extract maximum power from solar panel and could make instant decision to protect the system. In the same time the designed controller can control high voltage disconnect (HVD)-reconnect, and low voltage disconnect (LVD)-reconnect. An improved maximum power point tracking (MPPT) is achieved through a Peripheral interface controller (PIC) based Perturb and Observe (P&O) algorithm. Additionally, light emitting diode (LED) used as indicator and a display is featured to show the system status. A blue-tooth device is used to work it as a data logger to monitor system status by smart phone or Laptop. Furthermore, this SCC is developed to increase the efficiency with low cost. Experimented highest efficiency 99% is recorded within the cost of BDT 2050 taka only.
本文提出了一种智能充电控制器(SCC),它可以从太阳能电池板中提取最大的功率,并可以即时决策以保护系统。同时所设计的控制器可以控制高压断开(HVD)-重连和低压断开(LVD)-重连。通过外围接口控制器(PIC)的扰动和观察(P&O)算法实现了改进的最大功率点跟踪(MPPT)。此外,发光二极管(LED)用作指示器和显示器的特点,以显示系统状态。使用蓝牙设备作为数据记录器,通过智能手机或笔记本电脑监控系统状态。此外,开发该SCC是为了以低成本提高效率。实验最高效率为99%,仅在BDT 2050 taka的成本范围内记录。
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引用次数: 2
Stability improvement of simultaneous AC-DC power transmission system 交直流同步输电系统的稳定性改进
M. Rahman, M. Sheikh, Md. Alimul Islam Salim
This paper presents the concept of simultaneous ac-dc power transmission system with newly designed self adaptive Voltage Dependent control (VDCOL) procedure. Long ac transmission lines cannot be loaded to their thermal limits due to instability occurs in the power system. It is difficult to load long ac lines to their thermal limits as a sufficient margin is kept against transient instability. With the model proposed in this thesis, it will be possible to load these lines close to their thermal limits. The transmission lines and the conductors are allowed to carry usual ac along with dc superimposed on it. This thesis with newly designed controller gives us the feasibility of composite ac-dc power transmission line to get the advantages of parallel ac-dc transmission in order to transient stability and dynamic stability and dampen out oscillations. Simulation has been carried out during 1-phase and 3-phase fault in MATLAB software package (Simulink) to prove system stability enhancement.
本文采用新设计的自适应电压相关控制(VDCOL)程序,提出了交直流同步输电系统的概念。由于电力系统不稳定,长交流输电线路不能负荷到其热极限。将长交流线路加载到其热极限是困难的,因为要保持足够的余量以防止瞬态不稳定。利用本文提出的模型,将有可能将这些线路加载到接近其热极限的地方。传输线和导体允许携带普通的交流电和叠加在上面的直流电。本文结合新设计的控制器,给出了复合交直流输电线路的可行性,以获得并联交直流输电的暂态稳定性、动态稳定性和抑制振荡的优势。在MATLAB软件包(Simulink)中对单相和三相故障进行了仿真,验证了系统稳定性的增强。
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引用次数: 2
Detecting real time object along with the moving direction for visually impaired people 视障人士实时检测物体运动方向
Aniqua Nusrat Zereen, Sonia Corraya
Detection of real time moving object along with the moving direction in respect with visually impaired people is a challenging research area. The recent advancement in technology for real world scene capturing and portable devices like Microsoft Kinect necessitate the need of simple, reliable and faster technique for assisting blind navigation. This paper aims to develop a suitable and effective technique for moving object detection along with its moving direction in indoor environment. Depth information of the front scene of a blind people is captured using Microsoft Kinect. Three consecutive depth frames are extracted from video taken in one second and Distance along Line Profile graph is generated for four predefined lines of each depth frame. These line profile graphs are then analyzed for detecting any presence of moving object and its moving direction. After detail investigation, experimental result shows that the proposed method can successfully detect moving object along with its direction with 92% accuracy and still objects detection accuracy rate is 87%. The overall accuracy of the proposed method is 90%.
视障人群实时运动物体的运动方向检测是一个具有挑战性的研究领域。随着现实世界场景捕捉技术的进步和像微软Kinect这样的便携式设备的出现,需要一种简单、可靠、快速的技术来帮助盲人导航。本文旨在开发一种适合且有效的室内运动目标随运动方向检测技术。使用微软Kinect捕捉盲人前方场景的深度信息。从1秒内拍摄的视频中提取3个连续的深度帧,并对每个深度帧的4条预定义线生成沿线距离轮廓图。然后分析这些线轮廓图,以检测任何存在的移动物体及其移动方向。经过详细研究,实验结果表明,该方法可以成功地检测出沿其方向运动的物体,准确率为92%,静止物体的检测准确率为87%。该方法的总体准确率为90%。
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引用次数: 9
Numerical simulation for the high efficiency p-n Si solar cell with HT-EBL and ET-HBL HT-EBL和ET-HBL高效p-n - Si太阳能电池的数值模拟
A. Amin, M. F. Hossain
The Hole Transport-Electron Blocking Layer (HT-EBL) and Electron Transport-Hole Blocking Layer (ET-HBL) are added on the front surface and back surface of the silicon wafer respectively for designing the high efficiency p-n homojunction Si solar cell in this simulation. The cell was simulated using A One-Dimensional Device Simulation Program for Analysis of Microelectronic and Photonic Structures (AMPS-1D) by varying the doping density and layer thickness of the p type and n type Si layer. It has been investigated that there have a great effect of doping density and layer thickness on the efficiency of solar cell and optimum efficiency has been achieved. The maximum efficiency of 28.198% has been investigated at the doping density of 1.0e+021 cm−3 and layer thickness of 8000 nm.
在硅片的前表面和后表面分别添加空穴传输-电子阻挡层(HT-EBL)和电子传输-空穴阻挡层(ET-HBL)来设计高效率的p-n均结硅太阳电池。通过改变p型和n型硅层的掺杂密度和层厚,利用微电子和光子结构分析一维器件模拟程序(AMPS-1D)对电池进行了模拟。研究了掺杂密度和层厚对太阳能电池效率的影响,得到了最佳的效率。当掺杂密度为1.0e+021 cm−3,层厚为8000 nm时,效率达到28.198%。
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引用次数: 0
Linear pocket profile based pinch-off voltage model for nano scale n-MOSFET 基于线性口袋轮廓的纳米n-MOSFET断极电压模型
Prof. Dr. Engr. Muhibul Haque Bhuyan, Q. Khosru
This paper focuses on developing an analytical pinch-off voltage model for the pocket implanted nano scale n-MOSFETs based on symmetric linear pocket profiles both at the source and drain sides under the gate of the device. Straight line approximated equation is used to simulate the pocket profiles along the gate length at the surface of the MOS device. The effective doping concentration is derived for the whole gate length and is incorporated in the pinch-off voltage model that is obtained from the strong inversion charge expression at the surface. Then the pinch-off voltage is simulated for various drain and gate biases as well as for various device parameters. To observe the model validity, drain current vs. drain voltage curve is plotted for various gate biases by incorporating this pinch-off voltage model. The simulation results approve that the developed pinch-off voltage model can be used to study and characterize the pocket implanted advanced ULSI devices.
基于器件栅极下源极和漏极的对称线性口袋轮廓,建立了一种用于植入纳米n- mosfet的解析型管断电压模型。采用直线近似方程模拟了MOS器件表面沿栅长方向的微袋轮廓。推导出整个栅极长度的有效掺杂浓度,并将其纳入由表面强反转电荷表达式得到的掐断电压模型中。然后,模拟了各种漏极和栅极偏置以及各种器件参数下的引脚关断电压。为了观察模型的有效性,通过合并该截断电压模型,绘制了各种栅极偏置的漏极电流与漏极电压曲线。仿真结果表明,所建立的截断电压模型可用于研究和表征口袋植入的先进ULSI器件。
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引用次数: 1
Design and implementation of amphibious smart rescue robot 水陆两栖智能救援机器人的设计与实现
Md Norozzaman Jiko, Mahmudul Hasan Shayket, A. G. Bhuiyan, G. Rabby
Now-a-days robots make all tasks easier. Research is going on for developing robots for rescue and survey purposes. This paper presents a new type of rescue robot that can run on any rough surface including staircase. The robot also can float on the water and dive under the water. A new communication technology is used here which make it a unique rescue robot based on internet of things (IoT). So it can be easily controlled from anywhere at any time simply using computer or smartphone. Various sensors installed in this robot enable it to sense the environment. So, this amphibious robotic vehicle can be effectively used in rescue, survey at any hostile region and also in defense and research fields. Its flexible structure provide it to be modified and updated for expanding the fields of application.
如今,机器人使所有的工作变得更容易。开发用于救援和调查目的的机器人的研究正在进行。本文提出了一种新型救援机器人,它可以在包括楼梯在内的任何粗糙表面上运行。这个机器人还可以浮在水面上,也可以潜入水下。它采用了一种新的通信技术,使其成为一种独特的基于物联网的救援机器人。因此,只要使用电脑或智能手机,就可以随时随地轻松控制它。安装在这个机器人上的各种传感器使它能够感知环境。因此,这种两栖机器人车辆可以有效地用于任何敌对地区的救援,调查以及国防和研究领域。其灵活的结构使其易于修改和更新,以扩大其应用领域。
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引用次数: 3
Synchronization of different frequency power grids by back-to-back modular multilevel converter with CSMC-SPWM algorithm 采用CSMC-SPWM算法实现背靠背模块化多电平变换器同步不同频率电网
M. Alim, M. A. Khan, M. A. Munjer
This paper presents a control process and the functioning of Back-to-Back Modular Multilevel Converter (MMC) in connecting asynchronous grids of high-voltage DC transmission system. CSMC-SPWM algorithm is used to generate gate pulses of the switching devices of back-to-back MMC for running, shifting the system from higher to any other lower level of operation and connecting of two different frequencies power grids. In this research two power grids having different frequencies of 50Hz and 60Hz are connected. The simulation results shows that the MMC operates well and synchronized properly with asynchronous grids and power can transmitted in both direction. A tap changing transformer is used to step up the output voltage of the converter during reduced number of level operation.
本文介绍了背靠背模块化多电平变换器(MMC)在高压直流输电系统中连接异步电网的控制过程和作用。CSMC-SPWM算法用于产生背靠背MMC开关器件的栅脉冲进行运行,使系统从高电平运行到任意低电平运行,并连接两个不同频率的电网。本研究将50Hz和60Hz两个不同频率的电网连接起来。仿真结果表明,该系统运行良好,能与异步电网同步,并能实现电力的双向传输。分接变换变压器用于在降电平操作期间提高变换器的输出电压。
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引用次数: 2
Optical character recognition using back propagation neural network 基于反向传播神经网络的光学字符识别
Shyla Afroge, Boshir Ahmed, F. Mahmud
This paper represents an Artificial Neural Network based approach for the recognition of English characters using feed forward neural network. Noise has been considered as one of the major issue that degrades the performance of character recognition system. Our feed forward network has one input, one hidden and one output layer. The entire recognition system is divided into two sections such as training and recognition section. Both sections include image acquisition, preprocessing and feature extraction. Training and recognition section also include training of the classifier and simulation of the classifier respectively. Preprocessing involves digitization, noise removal, binarization, line segmentation and character extraction. After character extraction, the extracted character matrix is normalized into 12×8 matrix. Then features are extracted from the normalized image matrix which is fed to the network. The network consists of 96 input neurons and 62 output neurons. We train our network by proposed training algorithm in a supervised manner and establish the network. Eventually, we have tested our trained network with more than 10 samples per character and gives 99% accuracy for numeric digits (0∼9), 97% accuracy for capital letters (A∼Z), 96% accuracy for small letters (a∼z) and 93% accuracy for alphanumeric characters by considering inter-class similarity measurement.
本文提出了一种基于人工神经网络的前馈神经网络英语字符识别方法。噪声被认为是影响字符识别系统性能的主要因素之一。我们的前馈网络有一个输入层,一个隐藏层和一个输出层。整个识别系统分为训练和识别两个部分。这两个部分都包括图像采集、预处理和特征提取。训练和识别部分还包括分类器的训练和分类器的仿真。预处理包括数字化、去噪、二值化、线分割和特征提取。字符提取后,将提取的字符矩阵归一化为12×8矩阵。然后从归一化后的图像矩阵中提取特征,并将其送入网络。该网络由96个输入神经元和62个输出神经元组成。我们用提出的训练算法以监督的方式训练网络,并建立网络。最终,我们用每个字符超过10个样本测试了我们的训练网络,通过考虑类间相似性测量,数字数字(0 ~ 9)的准确率为99%,大写字母(A ~ Z)的准确率为97%,小写字母(A ~ Z)的准确率为96%,字母数字字符的准确率为93%。
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引用次数: 35
Guiding properties of a hybrid core porous fiber (HCPF) for terahertz wave propagation 杂化芯孔光纤(HCPF)对太赫兹波传播的导引特性
This paper presents the guiding properties of a porous core photonic crystal fiber for Terahertz (THz) wave propagation. The reported porous core fiber has a hybrid (triangular + circular) air hole arrangement at the core region with hexagonal cladding. Simulation results show a low EML of 0.425 dB/cm at 0.7 THz frequency with negligible (< 10−2 dB/cm) confinement and bending losses for the proposed porous fiber. Numerical results also show a 0.46 THz band of near zero flat dispersion at 0.9±0.05 ps/THz/cm. Changes in the guiding properties for tuning the design parameters of the core region of the hybrid core porous fiber (HCPF) are reported elaborately in this paper.
本文介绍了多孔芯光子晶体光纤对太赫兹(THz)波传播的引导特性。所述多孔芯纤维在芯区具有混合(三角形+圆形)气孔布置,并具有六角形包层。仿真结果表明,在0.7太赫兹频率下,该多孔光纤的EML为0.425 dB/cm,约束和弯曲损失可以忽略不计(< 10−2 dB/cm)。数值结果还表明,在0.9±0.05 ps/THz/cm下,0.46 THz波段的平坦色散接近于零。本文较详细地报道了杂化芯孔光纤芯区设计参数调整导向特性的变化。
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引用次数: 0
Fast DOA Estimation of Coherent Signals without Knowing the Number of Sources 不知道源数的相干信号的快速DOA估计
Zeng Yao-ping
A novel decorrelation algorithm that can eliminate the computation without having aperture loss is presented.Through vector reconstruction by eigenvector of maximum eigenvalue,the algorithm can deal with coherent signals.By utilizing high order power of the inverse matrix,the noise subspace can be approximate without knowing the number of signals.At the same time,the computation of algorithm is low because there is no eigendecomposition.Finally,the computer simulation confirms the validity of the proposed algorithm.
提出了一种新的去相关算法,可以在不造成孔径损失的情况下消除计算。该算法通过利用特征值最大的特征向量进行矢量重构,实现了对相干信号的处理。利用逆矩阵的高次幂,可以在不知道信号个数的情况下逼近噪声子空间。同时,由于没有特征分解,算法的运算量很低。最后,通过计算机仿真验证了算法的有效性。
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引用次数: 0
期刊
2016 2nd International Conference on Electrical, Computer & Telecommunication Engineering (ICECTE)
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