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Chennai, India

Palanivel G.,k-Technology | Vaishnavi P.,Annauniversity | Duraiswamy K.,k-Technology
International Journal of Applied Engineering Research | Year: 2015

The present research is aimed at analyzing rainfall pattern and classification to evaluate in district wise data in Tamilnadu and make possible the result in various seasons to understand the climate change. The dataset relates to monthly rainfall from various districts of Tamilnadu in the period of January to December in the Indian Metrological Department database. The time frame of the data pertaining to the present study is 2004-2010. The salient feature of this study is the application of Factor Analysis, K-means clustering and GIS (Geographical Information System) Map as data mining tools to explore the hidden pattern present in the dataset for each of the study periods. Factor analysis is applied first and the factor scores of extracted factors are used to find initial groups by k-means clustering algorithm. Finally, data mining tools are applied and the groups are identified as rainfall belonging to HR (High Rainfall), MR (Moderate Rainfall) and LR (Low Rainfall). The results of the present study indicate that Data Mining Tools can be used as a feasible tool for the analysis of large set of rainfall data. © Research India Publications. Source

Hemalatha S.,St. Josephs College | Valsalal P.,Annauniversity
European Journal of Scientific Research | Year: 2011

Today's world depends totally upon a high level of power system reliability. Accordingly it is very important not only to minimize power failure, but also to restore the power system network quickly and safely. Restoration consists of two steps, the first step is to determine an optimal configuration and the second step is to prepare a sequence of switching operations (restoration plan) in order to bring the faulted network into the target system. The identification of optimal path for the power flow in the network is one of the most important problems faced by the power system industry. The power flow path searched by the routing algorithms identifies the shortest path but could not guarantee that as an optimal path. The optimal path for transmitting the power from the generation to the demand is found by considering the constraints such as shortest path by distance (minimum loss), power balance between generation and demand and the capacity of the transmission line. The Dijkstra algorithm is applied to a practical 230kV network. The second step is to prepare the restoration plan with the guidance of the optimal path suggested by the dijkstra algorithm and the multi agent approach which is constructed with three level hierarchical architecture. The generator agent(SA) and the demand agent(DA) is located at the lower level which sends the availability of power and the request for power to the load dispatching agent(LDA) which is implemented in the second level is equipped with the additional knowledge of optimal path selection. After accepting the message from the agents, it co-ordinates, negotiates and prepares the restoration plan and sends the information to the managing agent(MA). The load flow program is executed for each step of restoration plan and it is informed to the lower level agents. © EuroJournals Publishing, Inc. 2011. Source

Sendilkumar S.,Annauniversity | Mathur B.L.,SSN College of Engineering | Henry J.,Anna University
Journal of Electrical Systems | Year: 2010

This paper presents a new approach to power transformer differential protection based on HS-transform and SVM (support vector machine). Here, HS-transform is used to generate frequency contours from samples of differential current and parseval's theorem is used to extract the features like energy and standard deviation. Subsequently these features are used as inputs to SVM for fault classification to identify the inrush current and fault current. The SVM is tested and trained with the features extracted from frequency contours for different fault conditions. Simulation of the fault (with and without noise) was done using MATLAB AND SIMULINK software taken 2 cycles of data each 400 samples. The advantage of the proposed algorithm provides more accurate results even with the presence of noisy inputs (Energy and standard deviation) and accurate in identifying inrush and fault currents. Overall accuracy of the proposed method is found to be 92.85%. © JES 2010. Source

Madhan M.G.,Dr Dharmambal Government Poly College | Rani G.A.F.,Annauniversity | Sridhar K.,Center for Electromagnetics | Kumar J.S.,Center for Electromagnetics
Procedia Engineering | Year: 2012

A multi section wideb and band pass filter with a centre frequency of 2.3 GHz and 3-dB bandwidth of approximately 618 MHz, is designed and fabricated. The design of the filter is based on transmission line section based circuit configuration. The salient features of this filter isthat it provides low insertion loss, sharp rejection along with simple approach and easy realization. The designed filter is simulated using Agilent® ADS tool and the experimental characteristics are found to be in close agreement with the simulation. Source

Purushothaman R.,B.S. Abdur Rahman University | Bilal I.M.,B.S. Abdur Rahman University | Palanichamy M.,Annauniversity
Journal of Polymer Research | Year: 2011

Aromatic terpolyimides were synthesized by the reaction of 3,3,4,4-oxydiphthalicdianhydride(ODPA), 3,3,4,4-biphenyldianhydride(BPDA) and 3,3,4,4-benzophenonetetracaboxylicdianhydride(BTDA) with 4,4-oxydianiline(ODA) via thermal imidization with the view to enhance their tensile properties without compromising thermal properties compared to their homo and copolyimides. Their films were characterized by FTIR, TGA, DSC and XRD. Their FTIR spectra established formation of polyimide by the characteristic vibrations at 1375cm -1(C-N stretch) and 1113 cm -1(imide ring deformation). TGA results showed imidization of residual polyamide acid close to 250 °C and decomposition of polyimides at about 540 °C. XRD results showed amorphous nature for all terpolyimides. Their tensile strength and tensile modulus were higher than either homo or copolyimides. Incorporation of BPDA, without bridging groups between the aromatic rings into the backbone of ODPA/BTDA-ODA is suggested as the cause for such an enhancement. Such terpolyimide can find application as adhesives in making flexible single/multilayer polyimide metal-clad laminates in flexible printed circuits and tape automated bonding applications. In addition, the terpolyimide, BPDA/BTDA/ODPA-ODA (mole ratio 0.5:0.25:0.25:1), showed low dielectric constant (3.52) as BPDA could offer slight rigidity by which the orientation of polar groupings could be reduced. © 2011 Springer Science+Business Media B.V. Source

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