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Search Results: 1 - 10 of 138895 matches for " K. Somasundaram "
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Wireless Sensor Network Lifetime Enhancement Using Modified Clustering and Scheduling Algorithm  [PDF]
K. Ramesh, K. Somasundaram
Circuits and Systems (CS) , 2016, DOI: 10.4236/cs.2016.78154
Abstract: Random distribution of sensor nodes in large scale network leads redundant nodes in the application field. Sensor nodes are with irreplaceable battery in nature, which drains the energy due to?repeated collection of data and decreases network lifetime. Scheduling algorithms are the one way?of addressing this issue. In proposed method, an optimized sleep scheduling used to enhance the?network lifetime. While using the scheduling algorithm, the target coverage and data collection?must be maintained throughout the network. In-network, aggregation method also used to remove the unwanted information in the collected data in level. Modified clustering algorithm?highlights three cluster heads in each cluster which are separated by minimum distance between them.?The simulation results show the 20% improvement in network lifetime, 25% improvement in?throughput and 30% improvement in end to end delay.
Multi-level sequential circuit partitioning for test vector generation for low power test in VLSI
VH Prathyush, K Somasundaram
International Journal of Engineering, Science and Technology , 2010,
Abstract: Sequential graph partitioning algorithms have been developed to fulfill the requirements of emerging multi-phase problems in circuit testing models. In this paper, we present a multi-level graph partitioning algorithm for circuit partitioning, which will minimize the number of test vectors during a low power test in VLSI circuits. By reducing the number of test vectors, we can reduce the energy consumption during the test. Our experimental results with ISCAS bench mark circuits have shown that the power can be reduced up to 55%.
Compression of Image using Fibonacci Code(FC) in JPEG2000
K. SOMASUNDARAM,P. SUMITRA
International Journal of Engineering Science and Technology , 2010,
Abstract: JPEG2000 is a image-coding standard developed for compression of any image. JPEG 2000, which provides a higher compression ratio than the traditional JPEG, is an upcoming compression standard for still images. The JPEG2000’s algorithm is based on Discrete Wavelet Transform (DWT) and the Embedded Block Coding with Optimal Truncation (EBCOT). Both algorithms are computationally intensive and require significant memory. We propose a new coding with Fibonacci numbers to compress losslessly the scalar quantized and DWT coefficients. We present a coding scheme based on Fibonacci numbers in the place of EBCOT in JPEG2000. We prove that Fibonacci code gives better results.
RGB & GRAY SCALE COMPONENT ON MPQ-BTC IN IMAGE COMPRESSION
K. Somasundaram,,P. Sumitra
International Journal on Computer Science and Engineering , 2011,
Abstract: Block Truncation Coding (BTC) is novel digital technique in image processing using which images can be coded efficiently. BTC has played an important role in the sense that many coding techniques have been developed based on it. Its main attraction being its simple underlying concepts and ease of implementation. We perform compression using two level quantizer and proving minimum Peak Signal Noise Ratio in both RGB and Gray Scale Component in image compression which yield goodresults in image compression.
Multi-Level Coding Efficiency with Improved Quality for Image Compression based on AMBTC
K. Somasundaram,S. Vimala
Computer Science , 2012,
Abstract: In this paper, we have proposed an extended version of Absolute Moment Block Truncation Coding (AMBTC) to compress images. Generally the elements of a bitplane used in the variants of Block Truncation Coding (BTC) are of size 1 bit. But it has been extended to two bits in the proposed method. Number of statistical moments preserved to reconstruct the compressed has also been raised from 2 to 4. Hence, the quality of the reconstructed images has been improved significantly from 33.62 to 38.12 with the increase in bpp by 1. The increased bpp (3) is further reduced to 1.75in multiple levels: in one level, by dropping 4 elements of the bitplane in such a away that the pixel values of the dropped elements can easily be interpolated with out much of loss in the quality, in level two, eight elements are dropped and reconstructed later and in level three, the size of the statistical moments is reduced. The experiments were carried over standard images of varying intensities. In all the cases, the proposed method outperforms the existing AMBTC technique in terms of both PSNR and bpp.
Comparing the Surgical Outcomes of Modified Quad and Triangle Tilt Surgeries to other Procedures Performed in Obstetric Brachial Plexus Injury  [PDF]
Rahul K. Nath, Juan-Carlos Pretto, Chandra Somasundaram
Surgical Science (SS) , 2013, DOI: 10.4236/ss.2013.49A003
Abstract:

Purpose: To compare results from our surgical treatment experiences in children with obstetric brachial plexus injuries (OBPI), to those who have had other surgical treatments. Methods: We conducted a retrospective study in our medical records consisting of two groups of OBPI patients. Group 1: 26 OBPI children (16 girls and 10 boys), age range between 2.0 and 12.0 (mean age 6.9), who have undergone surgical treatments at other institutions between 2005 and 2010. Group 2: 45 OBPI children (20 boys and 25 girls), age between 0.7 and 12.9 (mean age 3.7), who have had modified Quad and triangle tilt surgical treatment between 2005 and 2010 at our institution. In both groups Mean modified Mallet scores and radiological scores were measured and compared. All measurements were made at least one year post surgery in both groups. Results: Post-operative mean modified Mallet score was 11.8 ± 2.4 in group 1 patients, whereas post-mean modified Mallet score was 20 ± 2.7 (P < 0.0001) following modified Quad and triangle tilt surgeries in group 2 patients. Further, their radiological scores such as posterior subluxation, and glenoid version were 13.4 ± 21.3 and 30.2 ± 19.1 in group 1, whereas 32.1 ±13.5 (P < 0.0004), and 16.3 ± 11.5 (P < 0.008) in group 2 patients, when compared to normal values of 50, and 0 respectively. Conclusion: Patients who have had mod Quad and triangle tilt for OBPI obtained significantly better functional outcomes in modified total Mallet score as well as in radiological scores, when compared to those OBPI children, who underwent other procedures such as posterior glenohumeral capsulorrhaphy, biceps tendon lengthening, humeral osteotomy, anterior capsule release, nerve transfer/graft, botox and muscle/tendon transfer and release.

A comparative study of clusterhead selection algorithms in wireless sensor networks
K. Ramesh,Dr. K. Somasundaram
Computer Science , 2012, DOI: 10.5121/ijcses.2011.2411
Abstract: In Wireless Sensor Network, sensor nodes life time is the most critical parameter. Many researches on these lifetime extension are motivated by LEACH scheme, which by allowing rotation of cluster head role among the sensor nodes tries to distribute the energy consumption over all nodes in the network. Selection of clusterhead for such rotation greatly affects the energy efficiency of the network. Different communication protocols and algorithms are investigated to find ways to reduce power consumption. In this paper brief survey is taken from many proposals, which suggests different clusterhead selection strategies and a global view is presented. Comparison of their costs of clusterhead selection in different rounds, transmission method and other effects like cluster formation, distribution of clusterheads and creation of clusters shows a need of a combined strategy for better results.
Improved Fair-Zone technique using Mobility Prediction in WSN
K. Ramesh,Dr. K. Somasundaram
Computer Science , 2012, DOI: 10.5121/ijassn.2012.2203
Abstract: The self-organizational ability of ad-hoc Wireless Sensor Networks (WSNs) has led them to be the most popular choice in ubiquitous computing. Clustering sensor nodes organizing them hierarchically have proven to be an effective method to provide better data aggregation and scalability for the sensor network while conserving limited energy. It has some limitation in energy and mobility of nodes. In this paper we propose a mobility prediction technique which tries overcoming above mentioned problems and improves the life time of the network. The technique used here is Exponential Moving Average for online updates of nodal contact probability in cluster based network.
A New Predictive and Interpolative Image Compression Scheme Based on Block Truncation Coding
K. Somasundaram,I. Kaspar Raj
International Journal of Soft Computing , 2012,
Abstract: Block Truncation Coding (BTC) is a fast moment preserving lossy image compression technique. In this paper a new image compression scheme based on BTC is proposed. The proposed image compression scheme contains four techniques. They are prediction technique, bit plane omission technique, bit plane coding using 32 predefined visual patterns and interpolative technique. The experimental results show that the proposed image compression scheme achieves a low bit rate with reasonable good picture quality compared to the recent published work based on BTC. The proposed scheme also has low computational complexity.
A Comparative Study Of Clusterhead Selection Algorithms In Wireless Sensor Networks
K.Ramesh,K.Somasundaram
International Journal of Computer Science and Engineering Survey , 2011,
Abstract: In Wireless Sensor Network, sensor nodes life time is the most critical parameter. Manyresearches on these lifetime extension are motivated by LEACH scheme, which by allowingrotation of cluster head role among the sensor nodes tries to distribute the energy consumptionover all nodes in the network. Selection of clusterhead for such rotation greatly affects theenergy efficiency of the network. Different communication protocols and algorithms areinvestigated to find ways to reduce power consumption. In this paper brief survey is taken frommany proposals, which suggests different clusterhead selection strategies and a global view ispresented. Comparison of their costs of clusterhead selection in different rounds , transmissionmethod and other effects like cluster formation, distribution of clusterheads and creation ofclusters shows a need of a combined strategy for better results.
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