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2015 2nd International Conference on Recent Advances in Engineering & Computational Sciences (RAECS)最新文献

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Performance analysis of SAC-OCDMA in free space optical medium using MD and DDW code 用MD和DDW码分析自由空间光介质中SAC-OCDMA的性能
G. Kaur, Gurinder Singh
Spectral amplitude coded Optical code division multiple access technique (SAC-OCDMA) has become a major area of research in optical communication. OCDMA allows multiple users to access a medium simultaneously without any contention. It has ability to operate asynchronously, provide privacy and security and to reduce multiple user interference. In this paper performance of SAC-OCDMA with Multi-diagonal (MD) code and Diagonal double weight (DDW) code with FSO communication system is presented and compared under different conditions of rain and haze. 10 simultaneous users with 5Gbps data are evaluated in the system. Effect of transmitted power and beam divergence is also studied. Results have been formulated based upon eye diagrams and values of Q- factor and BER. Simulation results show that DDW code outperforms MD code for longer distance under rain and haze conditions. DDW code is able to perform well at low input power.
频谱幅度编码光码分多址技术(SAC-OCDMA)已成为光通信领域的一个重要研究方向。OCDMA允许多个用户同时访问一个介质而没有任何争用。它具有异步操作的能力,提供隐私和安全性,并减少多用户干扰。本文介绍了采用多对角码(MD)和对角双权重码(DDW)的无线通信系统SAC-OCDMA在不同雨雾条件下的性能,并对其进行了比较。在系统中评估10个同时使用5Gbps数据的用户。研究了发射功率和光束散度的影响。结果是根据眼图和Q因子和误码率的值制定的。仿真结果表明,在雨霾条件下,DDW码在更远的距离上优于MD码。DDW码能够在低输入功率下表现良好。
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引用次数: 13
Investigation of chronic disease correlation using data mining techniques 使用数据挖掘技术研究慢性病的相关性
V. Dominic, Deepa Gupta, S. Khare, A. Aggarwal
A disease is an abnormal condition that affects the structure and function of one or more parts of the body. It may be caused by various factors, external and internal dysfunctions. There is a trend of various chronic diseases in any society. The major concern is that these chronic diseases are leading to many other diseases in future. An attempt to explore the correlation of various chronic diseases has become a necessity. This can be achieved by using data mining techniques, which help to derive knowledge about the affects of a particular chronic disease on the other chronic diseases. Since there is growing trend of diabetes and ischemic heart disease in the society, in this paper the focus is to investigate the effect of these diseases on the other chronic diseases using the ICD9 diagnostic codes. To achieve this goal various types of data mining techniques are used. The conclusion is an optimal set of ICD9 diagnostic codes associated with individuals having diabetes or ischemic heart disease. These codes are then investigated based on the human anatomic systems i.e. Circulatory system, Respiratory system, Nervous system, Musculoskeletal system, Renal system and Neoplasm and their relevance is justified.
疾病是一种影响身体一个或多个部位的结构和功能的异常状况。它可能是由各种因素引起的,外部和内部功能障碍。任何社会都有各种慢性病的趋势。主要的担忧是,这些慢性疾病在未来会导致许多其他疾病。尝试探索各种慢性病的相关性已成为一种必要。这可以通过使用数据挖掘技术来实现,这有助于获得关于特定慢性病对其他慢性病影响的知识。由于糖尿病和缺血性心脏病在社会上呈增长趋势,本文的重点是利用ICD9诊断代码研究这些疾病对其他慢性疾病的影响。为了实现这一目标,使用了各种类型的数据挖掘技术。结论是一组与糖尿病或缺血性心脏病相关的ICD9诊断代码。然后根据人体解剖系统,即循环系统,呼吸系统,神经系统,肌肉骨骼系统,肾脏系统和肿瘤,对这些代码进行调查,并证明其相关性是合理的。
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引用次数: 15
Segmentation and block based image steganography using optimal pixel adjustment process and identical approach 分割和基于块的图像隐写采用最优像素调整过程和相同的方法
Swarnjeet Kaur, Navdeep Goel
Steganography plays a very important role in secret communication. Many possible techniques are used to embed confidential information in digital images, the least significant bit (LSB) technique has very widely used. However, maintaining the imperceptibility is still a major concern. In the proposed method, a hybrid approach of data hiding is used, in which a hybrid method of data hiding using optimal pixel adjustment process (OPAP) and identical matching has been used. Also, to make the algorithm more imperceptible data is divided into segments and image into blocks and a data segment is embedded into an image block where it effects the least image quality. The experimental results prove that the quality of stego image using the proposed algorithm has been improved over existing conventional methods of data hiding. For the verification of the results, peak signal-to-noise (PSNR) and mean square error (MSE) are calculated. The PSNR value for the proposed method yields approximately of 14 dB enhancement.
隐写技术在秘密通信中起着非常重要的作用。在数字图像中嵌入机密信息的技术有很多种,其中最低有效位(LSB)技术的应用非常广泛。然而,保持隐蔽性仍然是一个主要问题。该方法采用混合数据隐藏方法,采用最优像素调整过程(OPAP)和相同匹配相结合的混合数据隐藏方法。此外,为了使算法更不易察觉,将数据分成段,将图像分成块,并将数据段嵌入对图像质量影响最小的图像块中。实验结果表明,与现有的传统数据隐藏方法相比,该算法的隐写图像质量得到了提高。为了验证结果,计算了峰值信噪比(PSNR)和均方误差(MSE)。该方法的PSNR值提高了约14 dB。
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引用次数: 3
Parametric study of hybrid Savonius-Darrieus turbine 萨沃尼-达里乌斯混合涡轮参数化研究
S. Chawla, A. Chauhan, S. Bala
The current work presents the study to predict the pressure and velocity field distributions for a hybrid two-bucket Savonius rotor and three blade egg-beater type Darrieus rotor vertical axis wind turbine using Fluent in ANSYS 15.0. Two cases of overlap conditions for the Savonius rotor i.e. 10.7% and 20.5% have been considered in this study. The Savonius rotor height is assumed approximately equivalent to rotor diameter and NACA 0012 airfoil cross-section has been considered for Darrieus rotor. Contours of relative velocity and static pressure have been obtained from simulation study and it has been observed that the high performance of the hybrid rotor can be attributed to the high relative speed observed in proximity of Darrieus rotor.
本文利用ANSYS 15.0中的Fluent软件对两斗萨沃纽斯转子和三叶片打蛋器式萨沃纽斯转子混合型垂直轴风力机的压力场和速度场分布进行了预测研究。本研究考虑了Savonius转子的10.7%和20.5%两种重叠情况。萨沃纽斯旋翼高度假定近似等于旋翼直径,并考虑了NACA 0012翼型截面。通过仿真研究得到了相对速度和静压的轮廓,并观察到混合转子的高性能可归因于在达瑞乌斯转子附近观察到的高相对速度。
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引用次数: 6
Robust controller design for twin rotor system using quantitative feedback theory with parametric uncertainty 基于参数不确定性定量反馈理论的双转子系统鲁棒控制器设计
J. Sharma, B. Pratap
This paper presents quantitative feedback theory (QFT) based control, input disturbance rejection and tracking of a twin rotor system. Twin rotor system is a class of multiple-input multiple-output (MIMO) system having complex nonlinearity. QFT is a robust frequency domain technique based on Nichols chart. This technique achieves desired robust design over a specified range of plant uncertainty. QFT is used for the design of robust controllers for the plants with uncertainty in the parameters, input and output disturbances and noises. The twin rotor system with two inputs and two outputs having parametric uncertainty is divided into two equivalent single-input single-output (SISO) sub-systems. Based upon the performance, input disturbance rejection and tracking specifications, bounds are determined. After determining the bounds, controller and pre-filter are designed for each SISO sub-system which fulfills the necessary control, input disturbance rejection and tracking specifications. Simulation results demonstrate the effectiveness of the proposed robust controller.
本文研究了基于定量反馈理论的双转子系统的控制、输入干扰抑制和跟踪。双转子系统是一类具有复杂非线性的多输入多输出(MIMO)系统。QFT是一种基于Nichols图的鲁棒频域技术。该技术在给定的植物不确定性范围内实现所需的稳健设计。将QFT用于具有参数不确定性、输入输出扰动和噪声的对象的鲁棒控制器设计。将具有参数不确定性的双输入双输出双转子系统划分为两个等效的单输入单输出子系统。基于性能、输入干扰抑制和跟踪指标,确定了边界。在确定边界后,为每个SISO子系统设计控制器和预滤波器,以满足必要的控制、输入干扰抑制和跟踪要求。仿真结果验证了该鲁棒控制器的有效性。
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引用次数: 1
Simulation of FLC based five-level inverter fed open-end winding IM drive 基于FLC的五电平逆变器开放式绕组IM驱动仿真
Sanjiv Kumar, P. Agarwal
A fuzzy logic controller (FLC) based closed loop V/f control drive system for speed control of open-end winding induction motor fed by five-level inverter is proposed in this paper. In the proposed drive system one end of the open-end winding induction motor is fed by 3-phase, 3-level cascade inverter while the other end is fed by 3-phase, 2-level inverter to generates five-level in the motor phase voltage. A reverse mapping based space vector pulse width modulation technique is used to generate optimize switching signals for the devices to get required phase voltages. To achieving closed loop V/f speed control a fuzzy logic based auto tune controller is designed. The controller is capable of reducing undesirable sustained oscillations which are commonly occurred at low frequencies in constant V/f control variable speed induction motor drive. The complete drive system is simulated in MATLAB and results are presented for the entire speed range during both light and high load conditions.
提出了一种基于模糊控制器(FLC)的闭环V/f控制驱动系统,用于五电平变频器驱动的开放式绕组异步电动机的速度控制。在所提出的驱动系统中,开放式绕组感应电机一端由三相3电平级联逆变器馈电,另一端由三相2电平逆变器馈电,产生5电平的电机相电压。采用一种基于反向映射的空间矢量脉宽调制技术,为器件产生最优的开关信号以获得所需的相位电压。为了实现闭环V/f速度控制,设计了一种基于模糊逻辑的自动调谐控制器。控制器能够减少在恒定V/f控制变速感应电动机驱动中通常发生的低频不希望的持续振荡。在MATLAB中对整个驱动系统进行了仿真,并给出了轻负载和高负载下整个速度范围的仿真结果。
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引用次数: 1
Stochastic resonance in an exothermic irreversible reaction 放热不可逆反应的随机共振
Renuka Rai
In this article, we study a first order irreversible exothermic reaction under nonisothermal condition. It is one of the simplest systems capable of showing complex behaviour like multistability, oscillations and hysteresis. We have investigated this system in the presence of external drive and noise in the region where the system shows bistability. We demonstrate the phenomenon of stochastic resonance characterized by an enhancement of response of the system towards weak periodic drive in the presence of optimal noise.
本文研究了非等温条件下的一阶不可逆放热反应。它是最简单的系统之一,能够表现出复杂的行为,如多稳定性、振荡和滞后。我们研究了该系统在存在外部驱动和噪声的情况下,在系统显示双稳态的区域。我们证明了随机共振现象,其特征是在最优噪声存在下系统对弱周期驱动的响应增强。
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引用次数: 0
Improved power quality zeta converter fed switch reluctance motor drive 改进的电能质量zeta变换器供电开关磁阻电机驱动
Bhim Singh, A. Anand
This paper deals with the power factor correction (PFC) based zeta converter-fed switch reluctance motor (SRM) drive as a cost effective solution for low power applications. The speed of SRM is controlled by varying the DC-bus voltage appearing across the midpoint converter used for a 4-phase SRM. The zeta converter is designed in continuous inductor current mode, to regulate the DC output voltage and to improve the power quality of AC mains. Total harmonic distortion (THD) at AC mains current when SRM is fed by diode bridge rectifier is observed 70% to 80% which is brought down to less than 5% as per the IEEE- 519 standard for power quality.
本文讨论了基于功率因数校正(PFC)的zeta变换器馈电开关磁阻电机(SRM)驱动作为低功耗应用的成本有效解决方案。通过改变用于4相SRM的中点转换器上出现的直流母线电压来控制SRM的速度。zeta变换器设计为电感电流连续模式,用于调节直流输出电压,提高交流电源的电能质量。当SRM由二极管桥式整流器供电时,交流电源电流的总谐波失真(THD)为70%至80%,根据IEEE- 519电能质量标准,该失真率降至5%以下。
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引用次数: 1
Combined effect of rotation and magnetic field on Rayleigh-Bénard convection of a nanofluid layer in porous medium 旋转和磁场对多孔介质中纳米流体层瑞利-巴氏对流的联合影响
J. Ahuja, U. Gupta
To study the interdependent influence of rotation and magnetic field while acting simultaneously and keeping in mind applications of flow through porous medium in geophysics, especially in the study of earth's core and the presence of nano particles therein; the hydromagnetic stability of rotating nanofluid layer in porous medium is considered. Darcy-Model is incorporated for free-free boundaries. Method of superposition of basic modes and single term Galerkin approximation is used to get the eigen value equation. The mode of instability occurs through oscillatory motions instead of stationary convection. Numerical analysis for water based nanofluids with Cu and Ag nanoparticles is carried out using the software Mathematica. Ag-water nanofluid exhibits higher stability than Cu-water nanofluid in the presence of rotation and magnetic field in porous medium. Rotation parameter and magnetic field parameter are found to inhibit the onset of thermal convection while permeability assists the same.
研究旋转和磁场的相互影响,同时采取行动,并牢记通过多孔介质流动在地球物理学中的应用,特别是在研究地核及其中纳米颗粒的存在方面;考虑了多孔介质中旋转纳米流体层的磁稳定性。达西模型被纳入自由-自由边界。采用基本模态叠加法和单项伽辽金近似法得到了本征值方程。不稳定的模式是通过振荡运动而不是静止对流发生的。利用Mathematica软件对含Cu和Ag纳米粒子的水基纳米流体进行了数值分析。在多孔介质中,在旋转和磁场作用下,银水纳米流体表现出比铜水纳米流体更高的稳定性。发现旋转参数和磁场参数抑制热对流的发生,而磁导率则有助于热对流的发生。
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引用次数: 1
Wideband Triangular Antenna design with enhanced gain bandwidth for wireless communication applications 具有增强增益带宽的宽带三角形天线设计,用于无线通信应用
Jaspal Singh Khinda, M. Tripathy
A low cost electromagnetically coupled wide band Triangular Fractal Antenna appropriate for Ultra Wide Band (UWB) applications is presented. To achieve wideband frequency range, a rectangular partial ground plane along with the slots in radiating patch are employed. The four triangular shaped slots of scale 1/9 and one slot of scale 1/3 of original patch are embedded. The gain bandwidth of proposed antenna is further improved by using four small rectangular shaped slots in partial ground plane. The designed antenna is simulated using Finite Element Method (FEM) simulator HFSS and it is observed that there is improvement in gain bandwidth of 41.08% in the range of 7.63 GHz - 11.31 GHz.
提出了一种适用于超宽带应用的低成本电磁耦合宽带三角形分形天线。为了实现宽带频率范围,采用矩形部分地平面和辐射贴片的缝隙。嵌入原贴片1/9比例的4个三角形槽和1/3比例的1个槽。通过在部分地平面上使用四个小矩形槽,进一步提高了天线的增益带宽。采用有限元仿真器HFSS对设计的天线进行了仿真,结果表明,在7.63 GHz ~ 11.31 GHz范围内,天线的增益带宽提高了41.08%。
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引用次数: 5
期刊
2015 2nd International Conference on Recent Advances in Engineering & Computational Sciences (RAECS)
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