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

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Electromagnetic field radiation measurement for occupational settings using three axis Tesla meter 用三轴特斯拉计测量职业场所的电磁场辐射
M. A. Raquib, M. S. Hossain
This paper presents an assessment of exposure to extremely low power frequency (ELF) magnetic field in general and occupational settings using three-axis Tesla meter. The measurements are performed at the exposure level of PF magnetic field in some typical places where general public and occupational workers are subjected to the fields. In the occupational settings, high value of current radiates strong magnetic field that might exceed the safe limit of creating possible adverse health effects if proper shielding is not made. Radiated magnetic field from welding machines are measured and compared with international guidelines. In order to obtain space distribution, the work place is divided into meshes and fields are measured in the grid points. The measurements are performed using a single axis and three axis EMF meter (Gauss meter). Readings are taken in three axes to obtain a mean squared value for single axis EMF meter. The three axis EMF meter can directly measure the radiated field value without any calculation.
本文提出了一个评估暴露于极低工频(ELF)磁场在一般和职业设置使用三轴特斯拉仪表。这些测量是在一些典型的公众和职业工人受到磁场影响的场所进行的,在PF磁场的暴露水平上进行的。在职业环境中,高值电流辐射出强磁场,如果不进行适当的屏蔽,可能会超过对健康可能产生不利影响的安全限度。测量了焊接机的辐射磁场,并与国际标准进行了比较。为了获得空间分布,将工作场所划分为网格,并在网格点上测量场。测量是使用单轴和三轴EMF计(高斯计)进行的。读数采取在三个轴,以获得平均平方值的单轴电动势计。三轴电动势计可以直接测量辐射场值,不需要任何计算。
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引用次数: 2
Robust uniform concentric circular array beamforming in the existence of look direction disparity 存在视向差时的鲁棒均匀同心圆阵波束形成
M. Reza, M. S. Hossain, M. Hossein, M. Rashid
The concentric circular array with robust algorithm is addressed in this paper. A uniform concentric circular array antenna (CCAA) geometry is targeted due to its symmetrical configuration which enables the phased array antenna to scan azimuthally with minimal changes in its beam width and sidelobe levels. This paper first compares the performances of CCAA configuration with existing uniform circular arrays (UCA) to validate the suitability of the presented beamformer. Then the performance of CCAA based optimal beamformer is compared with delay-and-sum beamformer in the presence of interfering signals. The performance of optimal CCAA processor is reduced if signal of interest is deviate from the look direction. This paper also presents a diagonal loading technique to make the system robust for resolving the degradation problem and compare the performance with existing beamforming technique. MATLAB software is used to analyze the performance of proposed CCAA processor.
本文研究了具有鲁棒算法的同心圆阵。一种均匀的同心圆形阵列天线(CCAA)几何形状的目标是由于其对称的配置,使相控阵天线能够以最小的波束宽度和旁瓣电平变化进行方位扫描。本文首先将CCAA结构与现有的均匀圆形阵列(UCA)进行性能比较,以验证所提出的波束形成器的适用性。在干扰信号存在的情况下,比较了基于CCAA的最优波束形成器与延迟和波束形成器的性能。最优CCAA处理器的性能会因为感兴趣的信号偏离视觉方向而降低。本文还提出了一种对角加载技术,以提高系统的鲁棒性,解决了系统的退化问题,并与现有波束形成技术进行了性能比较。利用MATLAB软件对所提出的CCAA处理器进行了性能分析。
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引用次数: 13
Smart load management by dual mode energy meter for rational use of generated power 双模式电能表智能负荷管理,合理利用发电
Md. Alimul Islam Salim, M. Sheikh
Unfortunately electricity cannot be stored and hence it is the most perishable commodity in the world, it must therefore be used at the same second it is produced. But somehow if we can control the load of consumer section then it will be possible to use generated power of a country rationally for both using traditional and renewable resources. By using Dual Mode Energy Meter in consumer section which typically demonstrates two tariff modes, will inspire them to use more loads on off-peak hours which consequently reduces the loads in the peaking hours.
不幸的是,电不能储存,因此它是世界上最易腐烂的商品,因此它必须在生产出来的同时使用。但是,如果我们能够控制消费部门的负荷,那么就有可能合理利用一个国家的发电,同时利用传统资源和可再生资源。通过在用户区使用双模式电能表,通常显示两种收费模式,将激励他们在非高峰时段使用更多的负荷,从而减少高峰时段的负荷。
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引用次数: 0
Security analysis of co-located and distributed MIMO interference networks with linear receivers 带线性接收机的同址分布式MIMO干扰网络的安全性分析
K. N. Faisal, Md. Zahurul I. Sarkar, R. Sultana, Md. Sifatul Muktadir
In this paper, we compare the performance of the linear receivers such as maximum-ratio combining (MRC), zero-forcing (ZF) and minimum mean-square error (MMSE) receivers in enhancing security for co-located MIMO (C-MIMO) and distributed MIMO (D-MIMO) interference network. We derive the expressions for secrecy achievable rates in case of MRC, ZF and MMSE receivers for both C-MIMO and D-MIMO systems. Then, we determine the effect of interference on secrecy achievable rate for C-MIMO and D-MIMO system with MRC, ZF and MMSE receivers. Our results show that, the performance of D-MIMO system in enhancing security is better than C-MIMO system in case of all three receivers. It is also observed that ZF and MMSE receivers are more affected by interferences in D-MIMO system with compared to C-MIMO system.
本文比较了最大比组合(MRC)、零强迫(ZF)和最小均方误差(MMSE)等线性接收机在共址MIMO (C-MIMO)和分布式MIMO (D-MIMO)干扰网络中增强安全性的性能。我们推导了C-MIMO和D-MIMO系统中MRC、ZF和MMSE接收机的可保密率表达式。然后,我们确定了干扰对具有MRC、ZF和MMSE接收器的C-MIMO和D-MIMO系统保密可达率的影响。结果表明,在三种接收机的情况下,D-MIMO系统在增强安全性方面的性能优于C-MIMO系统。与C-MIMO系统相比,D-MIMO系统中ZF和MMSE接收器受干扰的影响更大。
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引用次数: 0
Exploiting parallelism for faster implementation of Bubble sort algorithm using FPGA 利用FPGA利用并行性更快地实现冒泡排序算法
Ashrak Rahman Lipu, Ruhul Amin, Md. Nazrul Islam Mondal, Md. Al Mamun
Sorting is a classic problem that has been studied for decades. From the beginning of computing, many Sorting algorithms have been investigated. Bubble sort is a very common and powerful sorting technique used in different applications. For high speed data processing, we need faster and efficient environment for any sorting algorithm. In this purpose, FPGA based hardware accelerators can show better performance for high speed data processing than the general purpose processors. In this paper, the sequential and parallel bubble sort algorithm is implemented using FPGA. We show that parallel implementation of Bubble sort algorithm is almost 10 times faster than that of sequential implementation for 20 different data inputs. However, this implementation is faster for more data inputs.
排序是一个已经被研究了几十年的经典问题。从计算开始,人们就研究了许多排序算法。冒泡排序是一种非常常见且功能强大的排序技术,可用于不同的应用程序。对于高速数据处理,任何排序算法都需要更快、更高效的环境。为此,基于FPGA的硬件加速器在高速数据处理方面比通用处理器表现出更好的性能。本文采用FPGA实现了顺序和并行泡泡排序算法。我们表明,对于20个不同的数据输入,冒泡排序算法的并行实现比顺序实现快近10倍。但是,对于更多的数据输入,这种实现更快。
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引用次数: 12
Linear precoding techniques in enhancing security of cognitive radio networks 提高认知无线网络安全性的线性预编码技术
R. Sultana, M. Sarkar, M. S. Hossain
In this paper, the problem of security in multiple input multiple output (MIMO) system has been analysed in the presence of an eavesdropper in cognitive radio networks. Multiple primary and secondary users communicate with the primary and secondary receiver, respectively. The secrecy capacity at primary receiver (PR) and secondary receiver (SR) have been calculated. At first, we use zero-forcing (ZF) precoding at the relay which enhances the secrecy capacity of PR and SR by nullifying the impact of interference. Secondly, we use a scheme to improve the secrecy capacity of the PR and SR using the existing interference energy of the communication medium employing selective precoding (SP) at the relay. Finally, we employ phase alignment precoding (PAP) for further increase in the secrecy capacity for PR and SR by using the destructive part of interference. Our analysis shows that among the three precoding techniques, the best performance is achieved by using the PAP at the relay in terms of secrecy capacity, complementary cumulative distribution function (CCDF) and outage probability analysis.
本文分析了认知无线网络中存在窃听者的多输入多输出(MIMO)系统的安全问题。多个主、从用户分别与主、从接收端通信。计算了主接收机和从接收机的保密能力。首先,我们在中继上使用零强迫(zero-forcing, ZF)预编码,通过消除干扰的影响来提高PR和SR的保密能力。其次,利用现有通信介质的干扰能量,在中继端采用选择性预编码(SP)提高PR和SR的保密能力。最后,我们采用相位对准预编码(PAP),利用干扰的破坏部分进一步提高了PR和SR的保密能力。分析表明,在三种预编码技术中,在中继中使用PAP在保密能力、互补累积分布函数(CCDF)和中断概率分析方面取得了最好的性能。
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引用次数: 4
An investigation of SAR inside human heart for antenna directivity, surface current variations and effect on antenna frequency in presence of heart 心脏存在时人体心脏内SAR天线方向性、表面电流变化及对天线频率影响的研究
M. M. U. Rashid, A. K. Sarkar, L. Paul, Amal Bouazizi, Rikta Sen, Bijoy Podder
In this work, the impact of human heart on an 800 MHz inset fed rectangular microstrip patch antenna characteristics were investigated using CST Microwave Studio. The antenna was simulated over a mimic human heart muscle and the distance between them was varied to analyze the changes in Specific Absorption Rate (SAR) upon antenna performance parameters (specifically, directivity & surface current) for discreet and waveguide port feeding. The results exhibited that the center frequency of the antenna was shifted to lower value and an increase in SAR values when the antenna was closer to heart for both the feeding techniques. However, the discrete port had more values of SAR than the waveguide port but for both cases SAR decreased with the increment of antenna distance from heart. SAR values for up to 4 mm distance in between the antenna and human heart did not satisfy IEEE and ICNIRP standards. For increasing surface current, the SAR values decreases due to less penetration of flux inside the tissue for both feeding techniques. Increasing directivity resulted decrement of SAR values due to the fact that more reflection of the wave from the tissue happened for more directivity. This work demonstrates how mobile phone antennas of GSM band affect human heart and how human heart affects antenna resonance frequency when mobile phones are kept in chest pocket.
在这项工作中,研究了人类心脏对800 MHz插入馈电矩形微带贴片天线特性的影响。在模拟人体心脏肌肉上模拟天线,并改变它们之间的距离,以分析天线性能参数(特别是指向性和表面电流)对分立和波导端口馈电的比吸收率(SAR)的变化。结果表明,在两种馈电方式下,天线中心频率都向较低的方向偏移,而SAR值则随着天线靠近心脏而增加。然而,离散端口的SAR值比波导端口高,但两种情况下的SAR值都随着天线距离心脏的增加而降低。天线与人体心脏之间4毫米距离的SAR值不符合IEEE和ICNIRP标准。对于增加表面电流,由于两种喂养技术中通量在组织内的渗透减少,SAR值降低。方向性的增加导致SAR值的降低,这是因为随着方向性的增加,组织会反射更多的波。本研究展示了GSM频段的手机天线对人体心脏的影响,以及当手机放在胸前口袋时,人体心脏对天线共振频率的影响。
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引用次数: 1
Low effective material loss microstructure fiber for THz wave guidance 用于太赫兹波制导的低有效材料损耗微结构光纤
Md. Ahasan Habib, M. Anower
In this paper we report a porous-core photonic crystal fiber having low material loss and nearly zero dispersion which is suitable for THz wave transmission. This proposed design exhibits a low effective material loss which is approximately 0.225 dB/cm at an operating frequency 1.0 THz and nearly zero flattened dispersion of ± 0.05 ps/THz/cm at frequency range of 0.9–1.2 THz. Moreover, other important guiding characteristics including confinement loss and power fraction of the proposed fiber is discussed. The proposed microstructure fiber has potential applications for efficient transmission of THz radiation band.
本文报道了一种适用于太赫兹波传输的材料损耗低、色散接近于零的多孔芯光子晶体光纤。该设计具有较低的有效材料损耗,在1.0太赫兹工作频率下约为0.225 dB/cm,在0.9-1.2太赫兹频率范围内,平坦色散接近于零,为±0.05 ps/THz/cm。此外,还讨论了光纤的约束损耗和功率分数等重要的指导特性。该微结构光纤在太赫兹波段的高效传输方面具有潜在的应用前景。
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引用次数: 20
Improvement of antenna performance using stacked microstrip patch antenna 利用叠层微带贴片天线改进天线性能
M. B. Hossain, Sham Datto
A rectangular stacked microstrip antenna has been designed in this paper to increase the performance of the conventional microstrip antenna. The antenna performances such as bandwidth, gain, directivity and return loss of the conventional and stacked antenna have been examined using coaxial probe feed and transmission line feed techniques. A comparative study has been also made between these two techniques. The antenna has been designed using ansoft HFSS software to operate in the C-band having resonant frequency 5.3 GHz.
为了提高传统微带天线的性能,本文设计了一种矩形叠层微带天线。采用同轴探针馈电和传输线馈电技术,对传统和堆叠天线的带宽、增益、指向性和回波损耗等天线性能进行了研究。并对这两种技术进行了比较研究。该天线采用ansoft HFSS软件设计,工作在谐振频率为5.3 GHz的c波段。
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引用次数: 12
Nonlinear adaptive controller design for velocity control of a DC motor driven by a DC-DC buck converter using backstepping approach 采用反步法对DC-DC降压变换器驱动的直流电机进行速度控制的非线性自适应控制器设计
T. K. Roy, M. Pervej, F. K. Tumpa, L. C. Paul
In this paper, a nonlinear adaptive controller is proposed to control the velocity of DC motors driven by DC-DC buck converters. The proposed controller is designed recursively based on the Lyapunov theory by considering the load torque of the DC motor is unknown. This unknown parameter is estimated through the adaptation law and the stability of the whole system is ensured based on the control Lyapunov function (CLF). Another main feature of the proposed control scheme is that it overcomes the over-parameterization problems of unknown parameter which generally emerges in some conformist adaptive methods. At last, the usefulness of the proposed control scheme is verified through the simulation results and performances of the designed controller are compared with an existing proportional-integral (PI) controller. Simulations results demonstrate the superiority of the proposed control scheme over an existing PI controller in term of settling time.
本文提出了一种非线性自适应控制器来控制由DC-DC降压变换器驱动的直流电机的速度。在考虑直流电机负载转矩未知的情况下,基于李雅普诺夫理论递归设计了该控制器。通过自适应律估计该未知参数,并基于控制Lyapunov函数(CLF)保证整个系统的稳定性。该控制方案的另一个主要特点是克服了传统自适应方法中存在的未知参数过参数化问题。最后,通过仿真结果验证了所提控制方案的有效性,并将所设计控制器的性能与现有的比例积分(PI)控制器进行了比较。仿真结果表明,所提出的控制方案在稳定时间方面优于现有的PI控制器。
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引用次数: 15
期刊
2016 2nd International Conference on Electrical, Computer & Telecommunication Engineering (ICECTE)
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