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2008 IEEE Region 10 and the Third international Conference on Industrial and Information Systems最新文献

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Development of Artificial Neural Network Models for Long-Range Meteorological Parameters Pattern Recognition over the Smaller Scale Geographical Region-District 小尺度地理区域-区域远程气象参数模式识别的人工神经网络模型研究
S. Karmakar, M. Kowar, P. Guhathakurta
Attempt to recognize pattern of meteorological parameters over the smaller scale geographical region (district) artificial neural network models have been developed. 54 years data for 1951-2004 have been used, of which the first 41 years (1951-1991) of data are used for training the network and data for the period 1991-2004 are used independently for validation. We have found that the mean absolute deviation (% of mean) between actual and predicted values of the each model is less than and half of the standard deviation (% of mean) in the independent period (1991-2004). The performances of these models in pattern recognition and prediction have been found to be extremely good. The models are developed and their evaluations have been presented in this paper.
建立了小尺度地理区域(区)气象参数模式识别的人工神经网络模型。使用了1951-2004年54年的数据,其中前41年(1951-1991年)的数据用于训练网络,1991-2004年的数据单独用于验证。我们发现,在独立时期(1991-2004),每个模型的实际值与预测值之间的平均绝对偏差(占平均值的百分比)小于标准差(占平均值的百分比)的一半。这些模型在模式识别和预测方面的性能非常好。本文建立了这些模型并对其进行了评价。
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引用次数: 9
Dimesionality Reduction using Association Rule Mining 基于关联规则挖掘的降维方法
Sajal Kumar Das, B. Nath
When data objects that are the subject of analysis using machine learning techniques are described by a large number of feature (i.e. the data is high dimension) it is often beneficial to reduce the dimension of the data. dimensionality reduction (DR) can be beneficial not only reasons of computational efficiency but also because it can improve the accuracy of the analysis. Now we have tried to introduce a novel transform to achieve dimensionality reduction. This paper summarizes survey on feature selection and extraction from high-dimensionality data sets using genetic algorithm. The feature selection process can be considered a problem of global combinatorial optimization in machine learning, which reduces the number of features, removes irrelevant, noisy and redundant data, to obtain the accuracy and saves the computation time and simplifies the result. We are trying to develop GA-based approach utilizing a feedback linkage between feature evaluation and association rule. That is we carry out feature selection simultaneously with association rule mining, through "genetic learning and evolution.
当使用机器学习技术进行分析的数据对象由大量特征(即数据是高维的)描述时,降低数据的维数通常是有益的。降维不仅可以提高计算效率,而且可以提高分析的准确性。现在我们尝试引入一种新的变换来实现降维。本文综述了利用遗传算法对高维数据集进行特征选择和提取的研究概况。特征选择过程可以看作是机器学习中的全局组合优化问题,通过减少特征数量,去除不相关、噪声和冗余数据,获得精度,节省计算时间,简化结果。我们正在尝试开发基于遗传算法的方法,利用特征评估和关联规则之间的反馈联系。也就是说,我们通过“遗传学习和进化”,将特征选择与关联规则挖掘同时进行。
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引用次数: 7
Early Quantitative Software Reliability Prediction Using Petri-nets 基于petri网的早期定量软件可靠性预测
K. K. Mohan, A. K. Verma, A. Srividya, G. V. Rao, R. Gedela
In a competitive business landscape, large organizations such as insurance companies and banks are under high pressure to innovate, improvise and distinguish their products and services while continuing to reduce the time-to market for new product introductions. Generating a single view of the customer is vital from different perspectives of the systems developer over a period of time because of the existence of disconnected systems within an enterprise. Therefore, to increase revenues and cost optimization, it is important to build enterprise systems more closely with the business requirements by reusing the existing systems. While building distributed based applications, it is important to take into account the proven processes like Rational Unified Process (RUP) to mitigate risks and increase the reliability of systems. Experiences in developing applications in Java Enterprise Edition (JEE) with customized RUP have been presented in this paper. RUP is adopted into an onsite-offshore development model along with ISO 9001 and SEICMM Level 5 standards. This paper provides an RUP approach to achieve increased reliability with higher productivity and lower defect density along with competitiveness through cost effective custom software solutions. Quantitative software reliability prediction is done using Generalized Stochastic Petri Nets, based on the RUP implemented prototype obtained from the PoC of a financial application prior to the actual implementation of the application development.
在竞争激烈的商业环境中,大型组织(如保险公司和银行)面临着创新、即兴发挥和区分其产品和服务的巨大压力,同时继续缩短新产品推出的上市时间。在一段时间内,从系统开发人员的不同角度生成客户的单一视图是至关重要的,因为企业中存在断开连接的系统。因此,为了增加收入和成本优化,通过重用现有系统来构建与业务需求更紧密的企业系统是很重要的。在构建基于分布式的应用程序时,重要的是要考虑经过验证的过程,如Rational统一过程(RUP),以减轻风险并增加系统的可靠性。本文介绍了在Java企业版(JEE)中使用定制的RUP开发应用程序的经验。RUP与ISO 9001和SEICMM Level 5标准一起被采用到现场-离岸开发模型中。本文提供了一种RUP方法,通过具有成本效益的定制软件解决方案,以更高的生产率和更低的缺陷密度实现更高的可靠性和竞争力。定量的软件可靠性预测是使用广义随机Petri网来完成的,它基于在应用程序开发的实际实现之前从财务应用程序的PoC中获得的RUP实现原型。
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引用次数: 13
A Fast Technique of Voltage Stability Analysis and Optimization in the Grid Network 一种快速的电网电压稳定分析与优化技术
M. Kowsalya, K. K. Ray, D. Kothari, Abhishek Kumar, Aurav Ghai
The relative positions of the bus voltage phasors in the voltage space of a system depend on the characteristics of and the power flow in, the transmission network. When the voltage space of the system is examined with respect to the "centroid" of the system voltage space, it is possible to identify the loadability of buses and rank them accordingly. A technique based on concepts applied to equilibrium analysis of rigid bodies is developed to determine the centroid voltage of the system voltage space and centroid voltage of the generator voltage space. The relative positions of the bus voltage phasors with respect to the centroid voltage of the system voltage space and centroid voltage of the generator voltage space are used to identify and compute a voltage stability index for the load buses in the system. The developed index [C2] is optimized using particle swarm optimization (PSO) and differential evolution algorithm (DE). The algorithm minimizes the voltage stability index of all the load buses to improve the static voltage stability margin.
系统电压空间中母线电压相量的相对位置取决于输电网的特性和输电网中的潮流。当系统的电压空间相对于系统电压空间的“质心”进行检查时,就有可能确定母线的可负载性并相应地对它们进行排序。基于刚体平衡分析的概念,提出了一种确定系统电压空间质心电压和发电机电压空间质心电压的方法。母线电压相量相对于系统电压空间的质心电压和发电机电压空间的质心电压的相对位置被用来识别和计算系统中负载母线的电压稳定指标。利用粒子群算法(PSO)和差分进化算法(DE)对指标[C2]进行了优化。该算法通过最小化各负载母线的电压稳定指标来提高静态电压稳定裕度。
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引用次数: 2
Evaluation of Nodal Prices and Revenue of Distributed Generation in Distribution Network Including Load Model 含负荷模型的配电网分布式发电节点电价与收益评估
R. Singh, S. Goswami
This paper addresses the effect of load models on nodal pricing and revenue generation of distributed generation (DG) in distribution network. Most of the literatures dealing with DGs have assumed loads as constant in their analyses. Since the loads are voltage and frequency sensitive, analysis assuming constant loads will give inaccurate and misleading results. Under deregulation locational pricing of power is popular in the context of transmission system. It is relevant to study the applicability of the pricing strategies in distribution system having distributed generation. It is shown that DG resources obtain more revenue under nodal pricing. It is further established that load models can significantly change the nodal prices and revenue of DG, and presence of DG improves voltage profile all around in the distribution network. The effectiveness of this work is verified through simulation results on a rural radial distribution system under time varying loading condition.
本文研究了配电网中负荷模型对分布式发电节点定价和发电收益的影响。大多数关于DGs的文献在分析中都假定荷载为常数。由于负载对电压和频率敏感,假设恒定负载的分析将给出不准确和误导性的结果。在放松管制的背景下,输电系统的电力区位定价已成为一种流行趋势。研究具有分布式发电的配电系统定价策略的适用性是有意义的。结果表明,在节点定价下,DG资源获得了更多的收益。进一步证实,负荷模型可以显著改变DG的节点价格和收益,DG的存在改善了配电网的电压分布。通过对时变负荷条件下农村径向配电系统的仿真,验证了该方法的有效性。
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引用次数: 4
Design and Implementation of Isolated High Power DC/DC Boost Converter Using DSP 基于DSP的隔离型大功率DC/DC升压变换器的设计与实现
Pravinkumar D. Patel, Miteshkumar N. Priyadrshi, V. Patel
A DC-DC converter of 10 KW capacity for converting 144 V DC voltage available as a battery supply to 600 V DC for battery backup drive is presented in this paper. The converter uses full bridge inverter - transformer -rectifier scheme to provide galvanic isolation between input and output and uses IGBTs to switch at 6 KHZ. The simulation results are shown and discussed. In this paper, a phase shifted control scheme is compared with conventional control scheme applied to an isolated dc-dc converter configuration with full-bridge inverter at the primary side and a fast recovery rectification method at the secondary side of the transformers. The proposed scheme is illustrated and experimentally verified by a 600 V, 10 kW prototype.
本文介绍了一种容量为10kw的DC-DC变换器,可将144v的直流电压转换为600v的直流电压,用于电池后备驱动。该变换器采用全桥逆变器-变压器-整流方案,在输入和输出之间提供电流隔离,并使用igbt在6 KHZ切换。给出了仿真结果并进行了讨论。本文将移相控制方案与传统控制方案进行了比较,该控制方案适用于隔离dc-dc变换器配置,在变压器的一次侧采用全桥逆变器,在变压器的二次侧采用快速恢复整流方法。该方案通过一个600 V, 10 kW的样机进行了说明和实验验证。
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引用次数: 5
An Approach for 3D Reconstruction of Environment Using Stereo-Vision System 基于立体视觉系统的环境三维重建方法
P. Shrivasthava, P. Vundavilli, D. K. Pratihar
During locomotion, one of various important tasks, a biped robot has to perform is the identification of 3D environment. The present work addresses the problem of offline 3D reconstruction of the environment using a stereo-vision system. The developed stereo-vision system works based on the concept of an epipolar geometry. The mathematical model that interpolates 3D position of a point with the help of an observed 2D point by two cameras, has been utilized to extract and virtually reproduce the environment, such as a staircase, a sloping surface and a ditch surface. The extracted information from the vision module may be used to plan the path of the biped robot in the said environment.
在运动过程中,双足机器人必须完成的重要任务之一是对三维环境的识别。目前的工作解决了使用立体视觉系统对环境进行离线3D重建的问题。开发的立体视觉系统基于极几何的概念工作。该数学模型借助两台摄像机观测到的二维点插值点的三维位置,用于提取和虚拟再现环境,如楼梯、斜坡表面和沟渠表面。从视觉模块提取的信息可用于规划两足机器人在所述环境中的路径。
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引用次数: 1
Synchronous VME64x Block Transfers with Bus-Invert Coding For Low Noise, Low Power Performance 同步VME64x块传输与总线反相编码低噪声,低功耗性能
A. Aloisio, P. Branchini
The VME64x standard defines a double edge source synchronous block transfer (2eSST) capable to sustain a data transfer rate up to 320 MByte/s on the VMEbus. This level of performance is achieved by double edge clocking a 64-bit bus with bursts of data strobe pulses. The switching activity of such a wide bus on a shared backplane challenges the signal integrity and the data transfer reliability. The bus-invert is a well known coding technique developed to lower the peak power dissipation in I/O busses by decreasing their switching activity. In this paper we discuss how the bus-invert coding can be applied to improve the 2eSST performance. The hardware overheads introduced by the encoding algorithm is discussed in the view of deployments in low-latency, real-time applications.
VME64x标准定义了一个双边源同步块传输(2eSST),能够在VMEbus上维持高达320 MByte/s的数据传输速率。这种级别的性能是通过双边缘时钟64位总线与数据频闪脉冲爆发实现的。这种宽总线在共享背板上的交换活动对信号的完整性和数据传输的可靠性提出了挑战。总线逆变是一种众所周知的编码技术,通过降低I/O总线的开关活动来降低其峰值功耗。在本文中,我们讨论了如何应用总线反相编码来提高2eSST的性能。从部署在低延迟、实时应用程序的角度讨论了编码算法带来的硬件开销。
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引用次数: 0
Analysis of Ferroresonant Oscillations in a Nonlinear Circuit 非线性电路中铁谐振振荡的分析
M. L. Prasad, M. Roy, C. K. Roy
Ferroresonance is a nonlinear oscillatory phenomenon, which occurs in capacitively coupled transformers under certain conditions in a power system. The magnetizing branch of the transformer at no-load is modeled by nonlinear equation. The coupling capacitances are treated as parameters and different numerical simulations of ferroresonance are performed. The power spectral density and phase plane analyses are conducted on ferroresonance over-voltage generated across transformer to identify the modes of ferroresonance.
铁磁谐振是电力系统中电容耦合变压器在一定条件下发生的一种非线性振荡现象。用非线性方程对变压器空载时的磁化支路进行了建模。以耦合电容为参数,进行了不同的铁谐振数值模拟。通过对变压器过电压的功率谱密度和相平面分析,确定了铁磁谐振的模式。
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引用次数: 5
Fault diagnosis of rolling element bearing using time-domain features and neural networks 基于时域特征和神经网络的滚动轴承故障诊断
B. Sreejith, A. K. Verma, A. Srividya
Rolling element bearings are critical mechanical components in rotating machinery. Fault detection and diagnosis in the early stages of damage is necessary to prevent their malfunctioning and failure during operation. Vibration monitoring is the most widely used and cost-effective monitoring technique to detect, locate and distinguish faults in rolling element bearings. This paper presents an algorithm using feed forward neural network for automated diagnosis of localized faults in rolling element bearings. Normal negative log-likelihood value and kurtosis value extracted from time-domain vibration signals are used as input features for the neural network. Trained neural networks are able to classify different states of the bearing with 100% accuracy. The proposed procedure requires only a few input features, resulting in simple preprocessing and faster training. Effectiveness of the proposed method is illustrated using the bearing vibration data obtained experimentally.
滚动轴承是旋转机械中的关键机械部件。在损坏的早期阶段进行故障检测和诊断是防止其在运行过程中出现故障和失效的必要条件。振动监测是用于检测、定位和区分滚动轴承故障的最广泛、最经济的监测技术。提出了一种基于前馈神经网络的滚动轴承局部故障自动诊断算法。从时域振动信号中提取正态负对数似然值和峰度值作为神经网络的输入特征。经过训练的神经网络能够以100%的准确率对轴承的不同状态进行分类。该方法只需要少量的输入特征,预处理简单,训练速度快。通过实测轴承振动数据,验证了该方法的有效性。
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引用次数: 124
期刊
2008 IEEE Region 10 and the Third international Conference on Industrial and Information Systems
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