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2015 Fifth International Conference on Advances in Computing and Communications (ICACC)最新文献

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Analysis of Propagation Characteristics of Circular Waveguide Loaded with Dielectric Disks Using Coupled Integral Equation Technique 用耦合积分方程技术分析加载介质盘的圆波导传播特性
L. Christie, G. Erabati, Mita Jana
Coupled Integral Equation Technique (CIET) is presented for the study of propagation characteristics of circular waveguide periodically loaded with dielectric disks operating in TM01d mode. CIET is a combination of Mode Matching Technique (MMT) and Method of Moments. The results are presented for three materials having different dielectric constants and compared with 3D simulation tool CST Studio in terms of simulation time and accuracy.
提出了耦合积分方程技术(CIET),用于研究在TM01d模式下周期性加载介质盘的圆波导的传播特性。CIET是模式匹配技术(MMT)和矩量法的结合。给出了三种不同介电常数材料的模拟结果,并与三维模拟工具CST Studio在模拟时间和精度方面进行了比较。
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引用次数: 1
Complementary Phase Power Divider Feed for Dipole Antenna Specific to GSM 900 Base Station Applications 针对GSM 900基站应用的偶极子天线的互补相位功率分配器馈电
Venkatanarayana Chittela, Suresh Kotapati, D. Ratnam
Power Divider (PD) design intended for feeding dipole antenna meant for Global System for Mobile Communications (GSM) 900 applications with an antenna height of 22 mm, operating in the frequency range of 880~960 MHz is presented herein. The PD provides 3 dB power division along with complementary phase at its output. The out of phase division of power divider is obtained by utilizing the concept of defected ground structures. A slot line accompanied by T-junction makes up the defected ground region, while coupled microstrip lines form the feed positions. The simulated and the measured results are in good coherence. PD shows good return loss and low insertion loss. It is observed that the dual polarized base station antenna has VSWR below 2 in the required frequency range, 10 dB gain and port to port isolation is less than 22 dB. The antenna is dual polarized and a + or - 45 degrees polarization is maintained.
本文介绍了一种用于馈电偶极子天线的功率分配器(PD)设计,该天线高度为22 mm,工作频率范围为880~960 MHz。PD提供3db的功率划分以及在其输出处的互补相位。利用缺陷接地结构的概念,得到了功率分压器的失相分相。带t型结的槽线构成缺陷接地区,耦合微带线构成馈电位置。仿真结果与实测结果具有较好的一致性。PD具有良好的回波损耗和较低的插入损耗。观察到双极化基站天线在所需频率范围内的驻波比小于2,增益为10 dB,端口间隔离小于22 dB。天线为双极化,保持+或- 45度极化。
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引用次数: 2
Wavelet-Based Gaussian Impulse Generation and Optimization for UWB Communication 基于小波的超宽带通信高斯脉冲生成与优化
V. V. Kumar, V. Ajith, M. Meenakshi
Ultra Wide Band (UWB) communication is a promising technology and which will be a revolution in the area of wireless communication. These subnano second narrow pulses spreading the energy over a wide frequency band and hence provides bandwidth in Giga Hertz. As one of the major concern while choosing the pulse shape for UWB communication is satisfying the FCC emission mask requirements. For an efficient UWB communication spectral efficiency should be good and it is possible to attain only with an optimal wave shaping method. The wave optimization is possible with several methods but an efficient UWB system should consumes very low power, optimum bandwidth and efficiently fitting under the FCC mask. UWB wireless systems should generate minimum interference to other Narrow Band systems in the same frequency band and mutual interference degrades the performances. The proposed technique offers low power consumption, optimum bandwidth, good spectral efficiency and reduces the mutual interferences without modifying the narrowband system architecture. The wave optimization has performed with wavelet method, which is one of the promising method. The interference mitigations also achieved with the help of wavelet based wave shaping with multi-resolution technique for the Transmitted Reference Ultra Wide Band(TR-UWB) signal. Finally the generated UWB signal has optimized with different values of wave shaping factor 'α' for higher order derivative of Gaussian pulse. Here wavelet based impulse waveform is generated using MATLAB for obtaining an interference free multisystem.
超宽带通信是一项极具发展前景的技术,它将是无线通信领域的一场革命。这些亚纳米秒的窄脉冲将能量传播到一个很宽的频带上,因此提供了以千兆赫为单位的带宽。在选择超宽带通信的脉冲形状时,主要考虑的问题之一是满足FCC的发射掩模要求。对于一个高效的超宽带通信,频谱效率应该是好的,只有通过最佳的整形方法才有可能实现。有几种方法可以实现波的优化,但一个有效的超宽带系统应该消耗非常低的功率,最佳的带宽,并有效地适应FCC掩模。超宽带无线系统对同频段其他窄带系统产生的干扰要最小,相互干扰会降低系统的性能。该技术在不改变窄带系统结构的前提下,具有功耗低、带宽优、频谱效率高、减少相互干扰等优点。用小波法进行了波优化,是一种很有前途的波优化方法。利用基于小波的多分辨率整形技术对传输参考超宽带(TR-UWB)信号进行干扰抑制。最后对高斯脉冲的高阶导数用不同的整形因子α值对生成的超宽带信号进行优化。本文利用MATLAB生成基于小波变换的脉冲波形,以获得无干扰的多系统。
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引用次数: 6
A Comparative Performance Analysis of Self Organizing Maps on Weight Initializations Using different Strategies 不同策略下权值初始化的自组织映射性能比较分析
H. Haripriya, R. Devisree, D. Pooja, Prema Nedungadi
Self Organizing Maps perform clustering of data based on unsupervised learning. It is of concern that initialization of the weight vector contributes significantly to the performance of SOM and since real world datasets being high-dimensional, the complexity of SOM tend to increase tremendously leading to increased time consumption as well. Our work focuses on the analysis of different weight initialization strategies and various dimensionality reduction measures with the intent to make SOM flexible for handling high-dimensional datasets. We use two methods of comparison, one on projected space and another before projection. The datasets used are real world datasets taken from UCI repository.
自组织地图基于无监督学习对数据进行聚类。值得关注的是,权重向量的初始化对SOM的性能有很大的贡献,而且由于现实世界的数据集是高维的,SOM的复杂性往往会大大增加,导致时间消耗也会增加。我们的工作重点是分析不同的权重初始化策略和各种降维措施,目的是使SOM灵活地处理高维数据集。我们使用两种方法进行比较,一种是在投影空间上进行比较,另一种是在投影前进行比较。使用的数据集是从UCI存储库中获取的真实数据集。
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引用次数: 3
CPW-fed Compact Multiband Antennas Using Circular Monopole with Hexagonal Slot 六方槽圆单极子cpw馈电紧凑多带天线
Saira Joseph, B. Paul, S. Mridula, P. Mohanan
In this paper, two antenna geometries for multiband applications are presented. The fundamental structure consists of a circular monopole with a hexagonal slot inscribed. This structure yields different operating bands which are suitable for global systems for mobile communications (GSM 1800/1900 1.71-1.88 GHz/1.85-1.99 GHz), wireless technology for personal area networks (Bluetooth 2.4-2.485 GHz) and international mobile telecommunications advanced system for fourth generation mobile communication (IMT-advanced 3.4-4.2 GHz). A higher operating band is obtained at upper wireless local area network (WLAN 5.725-5.825 GHz) by two different designs. The two designs are simulated using Ansys HFSS and the radiation characteristics of the two antennas are presented.
本文介绍了两种用于多波段应用的天线几何形状。它的基本结构是一个带有六角形凹槽的圆形单极子。这种结构产生了适合全球移动通信系统(GSM 1800/1900 1.71-1.88 GHz/1.85-1.99 GHz)、个人区域网络无线技术(蓝牙2.4-2.485 GHz)和国际移动通信先进系统(IMT-advanced 3.4-4.2 GHz)的不同操作频段。通过两种不同的设计,在上层无线局域网(WLAN 5.725-5.825 GHz)获得了更高的工作频带。利用Ansys HFSS对两种设计进行了仿真,给出了两种天线的辐射特性。
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引用次数: 2
A Novel Approach for Design, Implementation and Construction of Low Density Parity Check (LDPC) Memory 一种低密度奇偶校验(LDPC)存储器的设计、实现和构造新方法
B. Harshitha, M. Karthik, Vinayak Tambralli
Memory is an important part of any digital circuit in which data is stored and retrieved. Technology scaling, lower operating voltages and high integration densities leads for failures in the reliability of memories. The main problem is Single Event Upsets (SEUs) that alters the memories from its normal way of functioning. This paper presents design and implementation of Majority Logic (ML) detecting/decoding on different cyclic codes for error detection and correction. ML decoding method is more capable to detect and correct large number of errors but it takes same high access time for both error and error free codes which impacts memory performance. In this paper, the proposed advanced ML method reduces decoding cycles when there is no error in the data read. The error detection and correction method is done by majority logic decoding and is made effective for Low Density Parity Check (LDPC) codes. This method lowers the power consumption and latency for wide range sizes of code words.
存储器是任何数字电路中存储和检索数据的重要组成部分。技术规模化、较低的工作电压和较高的集成密度导致存储器可靠性的失效。主要问题是单一事件紊乱(SEUs),它改变了记忆的正常运作方式。本文设计并实现了多数逻辑(ML)对不同循环码的检测/解码,用于错误检测和纠错。ML解码方法更能检测和纠正大量错误,但对错误码和无错误码的访问时间都很长,这会影响内存性能。在本文中,提出了一种先进的机器学习方法,在读取数据没有错误的情况下,减少了解码周期。错误检测和纠错方法采用多数逻辑译码,对低密度奇偶校验码(LDPC)有效。这种方法降低了大范围码字的功耗和延迟。
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引用次数: 0
On Ranking in Triangular Intuitionistic Fuzzy Multi-criteria Decision Making under (a, ß)-cut with 'Useful' Parametric Entropy 有用参数熵下(a, ß)-cut下三角直觉模糊多准则决策的排序
N. Gandotra, R. Bajaj, J. Mathew
In the present communication, we have applied the concept of Triangular Intuitionistic Fuzzy Numbers (TIFNs) to the study of a Multiple Criteria Decision Making (MCDM) problem for finding the best alternative where the linguistic variables for the criteria are intuitively predefined in the form of TIFNs. On the basis of decision maker's qualitative opinions as well as the management's opinions to the criteria, the weight of each criterion is being calculated with the help of parametric entropy and 'useful' parametric entropy under α - cut/(α, β) - cut based distance measures for different possible values of parameters. Also, an algorithm for Triangular Intuitionistic Fuzzy Multi-criteria Decision Making (TIF-MCDM) problem where the ranking of the available alternatives by calculating the various distances between the ideal alternative and all the available alternatives has been provided. An illustrative example showing the procedure to rank the alternatives in view of the different opinions has also been provided.
在目前的交流中,我们已经将三角直觉模糊数(tifn)的概念应用于多准则决策(MCDM)问题的研究,以寻找最佳选择,其中标准的语言变量直观地以tifn的形式预定义。根据决策者的定性意见和管理层对准则的意见,在基于α -切/(α, β)切的距离度量下,利用参数熵和“有用”参数熵计算各准则的权重。提出了一种三角直觉模糊多准则决策(TIF-MCDM)算法,该算法通过计算理想方案与所有可行方案之间的各种距离来确定可行方案的排序。还提供了一个说明性的例子,说明根据不同意见对备选方案进行排序的程序。
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引用次数: 3
Risk Prediction of Disease Complications in Type 2 Diabetes Patients Using Soft Computing Techniques 应用软计算技术预测2型糖尿病患者疾病并发症的风险
Aruna Pavate, N. Ansari
Diabetes has become the fourth leading cause of death in developed countries. By the endurance and hasty spread of diabetes, with increased number of ill condition, complications in the disease all over the world, several methodologies have been developed to predict and prevent this chronic disease. An early diagnosis of disease helps patients and medical experts to reduce the problem, risk and cost of medications. This paper presented an efficient system to predict diabetes and further complications with risk level. In this system, methods including genetic algorithm, nearest neighbor, and fuzzy rule-based system have been used in order to provide an accurate prediction system to prepare for presence of diabetes and complications. In this system, 235 individual's data were collected. The best subsets of features generated by the implemented algorithm include the most common risk factors such as age, family history, BMI, weight, smoking habit, alcohol habit and also factors related to the presence of other diabetes complications considered for predication of disease. The proposed system was prejudiced and the results showed to be more suitable by selecting best subset of features selected using variations of genetic algorithm depending on the types of nearest neighbor. The succeeded results produced 95.83% sensitivity, 95.50% accuracy and 86.95% specificity on impenetrable data which support the effectiveness of the system to predict the disease.
糖尿病已成为发达国家的第四大死因。由于糖尿病的持久和迅速蔓延,在世界范围内疾病和并发症的数量增加,已经开发了几种方法来预测和预防这种慢性疾病。疾病的早期诊断有助于患者和医学专家减少问题、风险和药物费用。本文提出了一种预测糖尿病及其并发症的有效系统。在该系统中,采用了遗传算法、最近邻算法和模糊规则系统等方法,为糖尿病和并发症的出现提供了准确的预测系统。在这个系统中,收集了235个人的数据。实现的算法生成的最佳特征子集包括最常见的风险因素,如年龄、家族史、BMI、体重、吸烟习惯、饮酒习惯,以及用于预测疾病的与其他糖尿病并发症存在相关的因素。根据最近邻的类型,根据遗传算法的变化选择特征的最佳子集,结果表明该系统更适合。结果表明,该系统对非穿透性数据的敏感性为95.83%,准确度为95.50%,特异性为86.95%,支持该系统预测疾病的有效性。
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引用次数: 22
Satellite Image Fusion Based on Improved Fast Discrete Curvelet Transforms 基于改进快速离散曲线变换的卫星图像融合
K. Jemseera, P. Noufal
Image fusion is the process of merging two or more images into a more informative single image. Satellite image fusion uses high resolution panchromatic image and low resolution multispectral image. IHS, Brovery, PCA, Wavelet, Curvelet etc are the existing techniques available for image fusion. But simultaneous retention of spatial and spectral resolution is an important concern in remote sensing applications. In this paper we proposed an improved Satellite image fusion method based on Fast Discrete curvelet Transform (FDCT) via wrapping. The method uses an improved fusion rule, were the maximum FDCT coefficients from each cell of the Intensity component of the MS image and histogram matched PAN image are taken. The resulting image is then undergone a comparative analysis with the outcomes of existing methodologies. The comparative analysis proves that the proposed method retains more spatial and spectral details than other methods.
图像融合是将两个或多个图像合并成一个信息更丰富的单个图像的过程。卫星图像融合采用高分辨率全色图像和低分辨率多光谱图像。IHS、Brovery、PCA、Wavelet、Curvelet等是现有的图像融合技术。但同时保持空间和光谱分辨率是遥感应用中的一个重要问题。本文提出了一种改进的基于快速离散曲线变换(FDCT)的卫星图像包裹融合方法。该方法采用改进的融合规则,从MS图像和PAN图像的直方图匹配中提取强度分量的每个单元的最大FDCT系数。然后将得到的图像与现有方法的结果进行比较分析。对比分析表明,该方法比其他方法保留了更多的空间和光谱细节。
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引用次数: 5
Microstrip Bandstop Filters Based on Hexagonal Complementary Split Ring Resonators 基于六边形互补裂环谐振器的微带带阻滤波器
M. Bhaskar, J. Jasmi, T. Mathew
Bandstop filters are realized by etching periodic patterns of complementary split ring resonators(CSRR) on the ground plane, exactly below the central microstrip transmission line. This article presents hexagonal CSRR in the design of a band bandstop filter with stopbands at 1.45GHz. First, a regular hexagonal shaped CSRR is used to realize a bandstop filter. This hexagonal shaped SRR is modified to a new structure to realize a bandstop filter with same resonant frequency. These two hexagonal CSRRs are found to have similar results and the modified hexagonal filter is compact compared to the regular hexagonal filter. The structure is simple and compatible with PCB technology. Simulation results of both structures are validated through measurements.
带阻滤波器是通过在中央微带传输线下方的地平面上刻蚀互补裂环谐振器(CSRR)的周期图案来实现的。本文介绍了六边形CSRR在1.45GHz阻带带阻滤波器设计中的应用。首先,采用正六角形CSRR实现带阻滤波器。将六角形SRR改造成一种新的结构,实现了具有相同谐振频率的带阻滤波器。发现这两种六边形csrr具有相似的结果,并且改进的六边形滤波器比正六边形滤波器更紧凑。结构简单,兼容PCB技术。通过实测验证了两种结构的仿真结果。
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引用次数: 6
期刊
2015 Fifth International Conference on Advances in Computing and Communications (ICACC)
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