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Search Results: 1 - 10 of 401237 matches for " M. Jayamohan "
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AN IMPROVED DOMAIN CLASSIFICATION SCHEME BASED ON LOCAL FRACTAL DIMENSION
JAYAMOHAN M.,K. REVATHY
Indian Journal of Computer Science and Engineering , 2012,
Abstract: In fractal image compression, most of the time during encoding is spent for finding the best matching pair of range-domain blocks. Different techniques have been analyzed for decreasing the number of operations required for this range-domain matching. Encoding time can be saved by reducing the domain search pool for each range block. Domain blocks can be classified based on local fractal dimension. Fractal dimension is being studied as a measure to analyze the complexity of image portions. This paper proposes application of height balanced binary search trees for storing domain information ordered in terms of the local fractal dimension. The approach is toprepare the domain pool dynamically, by comparing the fractal dimension of range block with that of the domains. Domains with fractal dimension in an interval, evenly covering the fractal dimension of range block alone are given for comparison. We use AVL trees to enlist the domains based on their fractal dimension. Thedomain pool is prepared at runtime. Since the tree organization is used in the preprocessing phase, the proposed method can be used with any algorithm for fractal compression.
Dynamic Domain Classification for Fractal Image Compression
K. Revathy,M. Jayamohan
International Journal of Computer Science & Information Technology , 2012,
Abstract: Fractal image compression is attractive except for its high encoding time requirements. The image is encoded as a set of contractive affine transformations. The image is partitioned into non-overlapping range blocks, and a best matching domain block larger than the range block is identified. There are many attempts on improving the encoding time by reducing the size of search pool for range-domain matching.But these methods are attempting to prepare a static domain pool that remains unchanged throughout theencoding process. This paper proposes dynamic preparation of separate domain pool for each range block. This will result in significant reduction in the encoding time. The domain pool for a particular range block can be decided based upon a parametric value. Here we use classification based on local fractal dimension.
Dynamic Domain Classification for Fractal Image Compression
K. Revathy,M. Jayamohan
Computer Science , 2012, DOI: 10.5121/ijcsit.2012.4208
Abstract: Fractal image compression is attractive except for its high encoding time requirements. The image is encoded as a set of contractive affine transformations. The image is partitioned into non-overlapping range blocks, and a best matching domain block larger than the range block is identified. There are many attempts on improving the encoding time by reducing the size of search pool for range-domain matching. But these methods are attempting to prepare a static domain pool that remains unchanged throughout the encoding process. This paper proposes dynamic preparation of separate domain pool for each range block. This will result in significant reduction in the encoding time. The domain pool for a particular range block can be selected based upon a parametric value. Here we use classification based on local fractal dimension.
Some Studies on Prestressed Reinforced Granular Beds Overlying Weak Soil
J. Jayamohan,R. Shivashankar
ISRN Civil Engineering , 2012, DOI: 10.5402/2012/436327
Abstract:
Some Studies on Prestressed Reinforced Granular Beds Overlying Weak Soil
J. Jayamohan,R. Shivashankar
ISRN Civil Engineering , 2012, DOI: 10.5402/2012/436327
Abstract: This paper mainly investigates, from a series of laboratory scale bearing capacity tests carried out on a model square footing, the improvement in bearing capacity and reduction in settlement of a geonet reinforced granular bed (RGB) overlying weak soil due to prestressing the reinforcement. The parameters are the strength of the underlying weak soil, thickness of the granular bed, and magnitude and direction of prestressing force. The settlements at the interface are also measured. The addition of prestress to geonet reinforcement results in significant improvement in the load carrying capacity and settlement response of the prestressed geonet RGB. Improvement in bearing capacity is found to be more with biaxial prestressing than with uniaxial prestressing. Experimental results are also used to validate a proposed numerical model. The BCR (bearing capacity ratio) values predicted from this model are found to be in good agreement with the experimentally obtained BCR values. Finite element analyses are also carried out using the programme PLAXIS, to study the effect of prestressing the reinforcement. Results obtained from finite element analyses are also found to be in good agreement with the experimental results. 1. Introduction Soil reinforcing technique, using geosynthetics, has become a major ground improvement technique in geotechnical practice over the last three decades [1]. Its use is growing rapidly as worldwide development of infrastructure poses an increasing demand for land reclamation and utilization of soft foundation soils. Placing a granular bed over weak soil is the simplest technique of ground improvement that reduces settlements and increases bearing capacity of weak soil. The use of geosynthetic reinforced granular bed (RGB) over weak soil further reduces settlement and increases the bearing capacity of weak soil. Many experimental and analytical studies have been performed to investigate the behaviour of reinforced granular beds for different soil types. Binquet and Lee [2] conducted tests on sand reinforced with metal strips. Shivashankar et al. [3] proposed that the improvement in bearing capacity of a reinforced granular bed is comprised of three components, namely, shear layer effect, confinement effect and surcharge effect. They proposed equations for computing the effect of each of these components. Kurian et al. [4] simulated reinforced soil systems with horizontal layers of reinforcement using a 3D nonlinear finite element programme. The results of numerical analysis were in good agreement with those obtained from model
Sonographic Evaluation of Pleural Effusion  [PDF]
Ajit Kumar Reddy, Sandeep Ballal Kaup, Annitha Elavarasi Jayamohan, Prakash Manikka Lakshmanan, Krishnappa Nasappa, Antony Jean
Open Journal of Medical Imaging (OJMI) , 2017, DOI: 10.4236/ojmi.2017.73008
Abstract: Background: Although at times small amounts of pleural fluid is detected on the lateral decubitus chest radiograph, this may be impossible to obtain in severely ill patients. Because of its ready availability and ability for bedside imaging, ultrasonography has become a crucial imaging modality not only in detecting the presence of pleural fluid but also as a guide to aspiration. Aims: To sonographically determine the nature of pleural effusions. To analyze predictability of both benign and malignant pleural effusions and to study statistical value of various ultrasound characteristics in differentiating exudative and transudative as well as benign and malignant effusions in correlation with thoracocentesis. Material and Methods: Sonographic feature as well as fluid cytology was evaluated. Following categorization into exudates or transudate as well as benign or malignant the diagnosis was then correlated biochemically. Results: Transudates were anechoic, while an anechoic effusion may be either a transudate or an exudate. Complex septation, internal echoes, thickened pleura or homogeneously echogenic patterns were always exudates. Sonographic findings of pleural nodules and associated parenchymal lesions in the lung and liver were indicative of malignancy. Conclusions: Ultrasound in addition to being highly sensitive for pleural effusion also aided in characterizing the nature and minimizing the complications during thoracocentesis. Pleural effusions were categorized into exudates and transudate as well as benign and malignant with a certain degree of confidence based on sonographic findings.
Study of Duct Characteristics Deduced from Low Latitude Ground Observations of Day-Time Whistler at Jammu  [PDF]
M. Altaf, M. M. Ahmad
International Journal of Astronomy and Astrophysics (IJAA) , 2013, DOI: 10.4236/ijaa.2013.33032
Abstract:

Propagation characteristics of low latitude whistler duct characteristics have been investigated based on day-time measurements at Jammu. The morphogical characteristics of low latitude whistlers are discussed and compared with characteristics of middle and high latitude whistlers. The Max. electron density (Nm) at the height of the ionosphere obtained from whistler dispersion comes out to be higher than that of the background which is in accordance with the characteristics of whistler duct. The equivalent width is found to be close to the satellite observations and the characteristics of whistler duct in low latitude ionosphere are similar to those in middle and high latitude ionosphere. The width of ducts estimated from the diffuseness of the whistler track observed during magnetic storm is found to lie in the range of 50 - 200 Km.

Review Article: Immobilized Molecules Using Biomaterials and Nanobiotechnology  [PDF]
Magdy M. M. Elnashar
Journal of Biomaterials and Nanobiotechnology (JBNB) , 2010, DOI: 10.4236/jbnb.2010.11008
Abstract: Immobilized molecules using biomaterials and nanobiotechnology is a very interesting topic that touching almost all aspects of our life. It uses the sciences of biology, chemistry, physics, materials engineering and computer science to develop instruments and products that are at the cutting edge of some of today’s most promising scientific frontiers. In this review article, the author based on his experience in this arena has tried to focus on some of the supports for im-mobilization; the most important molecules to be immobilized such as DNA, cells, enzymes, metals, polysaccharides, etc and their applications in medicine, food, drug, water treatment, energy and even in aerospace. He specified a special section on what is new in the arena of supports and technologies used in enzyme immobilization and finally a recommendation by the author for future work with a special attention to up-to-date references.
Using of the generalized special relativity (GSR) in estimating the neutrino masses to explain the conversion of electron neutrinos  [PDF]
M. H. M. Hilo
Natural Science (NS) , 2011, DOI: 10.4236/ns.2011.34044
Abstract: In this work the Generalized Special Relativity (GSR) is utilized to estimate masses of some elementary particles such as, neutrinos. These results are found to be in conformity with experimental and theoretical data. The results obtained may explain some physical phenomena, such as, conversion of neutrinos from type to type when solar neutrino reaches the Earth.
Postischemic Lower Extremity Wounds Treated with and without Negative Pressure Dressing  [PDF]
Naz?mmü?
Surgical Science (SS) , 2012, DOI: 10.4236/ss.2012.37075
Abstract: Background: Vacuum-assisted dressing is a noninvasive closure system of the wound, which makes localized and controlled negative pressure. Its mechanical tension reduces edema, stimulates granulation tissue formation and angiogenesis, and prepares the wound bed for closure. In this study, a patient has been presented, who suffered from serious lower extremity wounds due to arterial emboli, one of her wounds has been treated with vacuum-assisted dressing and the other with conventional dressing to evaluate the efficacy of vacuum-assisted dressing in acute ischemic wounds. Methods: A 65-year-old female patient was admitted to the emergency clinic, due to complaint of severe pain in her right lower extremity which suggested an acute arterial occlusion. She immediately underwent an embolectomy operation; however, a few days later, severe ischemia on the leg and foot became appearant. All of the necrosis was sharply debrided under sterile conditions in the operating room, and then lower leg wound was covered with vacuum-assisted dressing, also calcaneal wound was dressed with silver sulphadiazine. Results: Eighteen days after the first dressing with negative pressure, distal leg wound became ready for closure, whereas, enough granulation tissue over the calcaneal area developed merely thirty-four days later. Calcaneal wound closed spontaneously within fifty-three days. Conclusions: When dealing with this experience, using the negative pressure dressing in patient with severe lower limb wounds following arterial emboli, accelerates wound healing by means of developing the granulation tissue, and rapidly prepares the wound for closure, so it may reduce the risk of amputation.
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