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Search Results: 1 - 10 of 297458 matches for " J. Devishree "
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A novel CAD system for breast cancer segmentation in sonograms
Alamelumangai N.,Devishree J.
Journal of Engineering and Applied Sciences , 2011,
Abstract: Breast cancer has turned out to be the most important health concern in the world over the past years. Early diagnosis is an efficient method to detect and supervise breast cancer. Computer diagnosis system can act as a major function in the early detection of breast cancer and can decrease the death rate among women with breast cancer. This paper provides a better system which detects cancer in early stages. The proposed system involves three phases such as speckle noise reduction, image enhancement and image segmentation. To remove speckle noise, we have used Neuro-Fuzzy based Memetic algorithm. Image enhancement is performed using Hough transform. Later, the enhanced image is segmented using clustering technique called Modified Fuzzy Possibilistic C-Means technique with Repulsion factor to identify the cancer affected region. The experimental result suggests that the proposed system results in better detection of cancer regions when compared to the existing technique.
A Photovoltaic Uninterruptible Power Supply System Synchronised to the Grid
J. Devishree,P. Anbalagan
Journal of Applied Sciences , 2006,
Abstract: This study presents a pragmatic implementation of photovoltaic Uninterruptible Power Supply (UPS) using battery storage. The system incorporates a 100 W photovoltaic array, a 100 VA power conditioning unit which can operate both in charging and inverting modes and a 25-Ah battery bank. The system can provide uninterruptible power, load voltage stabilization in conditions of voltage or frequency fluctuations beyond tolerable level. The conditioner is desired to give maximum power tracking and power factor correction. A pwm-gate control utilizes multilevel form of output voltage and effectively increases the switching frequency of inverter without increasing the switching frequency of the power semiconductor switches. Simulation studies over inverter output voltage and the output on grid side have been done on MATLAB. The simulation results show that the proposed design can significantly improve power quality of photovoltaic generators.
Automated Clustering of Cancer Cells Using Fuzzy C Means with Repulsions in Ultrasound Images
N. Alamelumangai,J. Devishree
Journal of Artificial Intelligence , 2012,
Abstract: In the report provided by World Health Organization (WHO), breast cancer is one of the highly deadliest cancers occurred in middle-aged women. Accurate diagnosis and prediction are essential to decrease the high death rate. In the past few years, breast ultrasound images have turn out to be an optional for mammography to help distinguish benign from malignant lesions. Its advantages safety and cost-effectiveness as discussed by various authors have turned ultrasound method into an increasingly significant function in the estimate of breast lesions. Like ultrasound exams in general, breast ultrasound exams are comparatively low-priced and do not utilize X-rays or other kinds of probably dangerous radiation. As a result, breast inspection with the help of ultrasound method has turn out to be a main option to mammography. This study provides a new technique in the field of computer science for diagnosis of breast tumors on ultrasound images. Some preprocessing steps are performed in the obtained ultrasound image in to enhance it for better diagnosis. Finally, the cancerous cells are distinguished by clustering them. This study uses Modified Fuzzy Possibilistic C-Means technique with Repulsion factor for the purpose of clustering the cancerous cells. The proposed computer-aided diagnosis systems are evaluated using the real time breast ultrasound images. The accuracy of predicting the cancer regions in the breast is higher when compared to the conventional technique. Also, the standard deviation resulted for the proposed approach is lesser than conventional technique. The experimental results show that the proposed technique results in better detection of cancer regions as it produces higher accuracy of detecting the cancer regions.
Ezrin Is Required for the Functional Regulation of the Epithelial Sodium Proton Exchanger, NHE3
Hisayoshi Hayashi, Atsushi Tamura, Devishree Krishnan, Sachiko Tsukita, Yuichi Suzuki, Hetal S. Kocinsky, Peter S. Aronson, John Orlowski, Sergio Grinstein, R. Todd Alexander
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0055623
Abstract: The sodium hydrogen exchanger isoform 3 (NHE3) mediates absorption of sodium, bicarbonate and water from renal and intestinal lumina. This activity is fundamental to the maintenance of a physiological plasma pH and blood pressure. To perform this function NHE3 must be present in the apical membrane of renal tubular and intestinal epithelia. The molecular determinants of this localization have not been conclusively determined, although linkage to the apical actin cytoskeleton through ezrin has been proposed. We set out to evaluate this hypothesis. Functional studies of NHE3 activity were performed on ezrin knockdown mice (Vil2kd/kd) and NHE3 activity similar to wild-type animals detected. Interpretation of this finding was difficult as other ERM (ezrin/radixin/moesin) proteins were present. We therefore generated an epithelial cell culture model where ezrin was the only detectable ERM. After knockdown of ezrin expression with siRNA, radixin and moesin expression remained undetectable. Consistent with the animal ultrastructural data, cells lacking ezrin retained an epithelial phenotype but had shortened and thicker microvilli. NHE3 localization was identical to cells transfected with non-targeting siRNA. The attachment of NHE3 to the apical cytoskeleton was unaltered as assessed by fluorescent recovery after photobleaching (FRAP) and the solubility of NHE3 in Triton X-100. Baseline NHE3 activity was unaltered, however, cAMP-dependent inhibition of NHE3 was largely lost even though NHE3 was phosphorylated at serines 552 and 605. Thus, ezrin is not necessary for the apical localization, attachment to the cytoskeleton, baseline activity or cAMP induced phosphrylation of NHE3, but instead is required for cAMP mediated inhibition.
New components of the mercury’s perihelion precession  [PDF]
J. J. Smulsky
Natural Science (NS) , 2011, DOI: 10.4236/ns.2011.34034
Abstract: The velocity of perihelion rotation of Mercury's orbit relatively motionless space is computed. It is prove that it coincides with that calculated by the Newtonian interaction of the planets and of the compound model of the Sun’s rotation.
Simple General Purpose Ion Beam Deceleration System Using a Single Electrode Lens  [PDF]
J. Lopes, J. Rocha
World Journal of Engineering and Technology (WJET) , 2015, DOI: 10.4236/wjet.2015.33014
Abstract: Ion beam deceleration properties of a newly developed low-energy ion beam implantation system were studied. The objective of this system was to produce general purpose low-energy (5 to 15 keV) implantations with high current beam of hundreds of μA level, providing the most wide implantation area possible and allowing continuously magnetic scanning of the beam over the sample(s). This paper describes the developed system installed in the high-current ion implanter at the Laboratory of Accelerators and Radiation Technologies of the Nuclear and Technological Cam-pus, Sacavém, Portugal (CTN).
Constraints on velocity anisotropy of spherical systems with separable augmented densities
J. An
Physics , 2011, DOI: 10.1088/0004-637X/736/2/151
Abstract: If the augmented density of a spherical anisotropic system is assumed to be multiplicatively separable to functions of the potential and the radius, the radial function, which can be completely specified by the behavior of the anisotropy parameter alone, also fixes the anisotropic ratios of every higher-order velocity moment. It is inferred from this that the non-negativity of the distribution function necessarily limits the allowed behaviors of the radial function. This restriction is translated into the constraints on the behavior of the anisotropy parameter. We find that not all radial variations of the anisotropy parameter satisfy these constraints and thus that there exist anisotropy profiles that cannot be consistent with any separable augmented density.
On the augmented density of a spherical anisotropic dynamic system
J. An
Physics , 2010, DOI: 10.1111/j.1365-2966.2011.18324.x
Abstract: This paper presents a set of new conditions on the augmented density of a spherical anisotropic system that is necessary for the underlying two-integral phase-space distribution function to be non-negative. In particular, it is shown that the partial derivatives of the Abel transformations of the augmented density must be non-negative. Applied for the separable augmented densities, this recovers the result of van Hese et al. (2011).
Fractional calculus, completely monotonic functions, a generalized Mittag-Leffler function and phase-space consistency of separable augmented densities
J. An
Physics , 2012,
Abstract: Under the separability assumption on the augmented density, a distribution function can be always constructed for a spherical population with the specified density and anisotropy profile. Then, a question arises, under what conditions the distribution constructed as such is non-negative everywhere in the entire accessible subvolume of the phase-space. We rediscover necessary conditions on the augmented density expressed with fractional calculus. The condition on the radius part R(r^2) -- whose logarithmic derivative is the anisotropy parameter -- is equivalent to R(1/w)/w being a completely monotonic function whereas the condition on the potential part is stated as its derivative up to the order not greater than 3/2-b being non-negative (where b is the central limiting value for the anisotropy parameter). We also derive the set of sufficient conditions on the separable augmented density for the non-negativity of the distribution, which generalizes the condition derived for the generalized Cuddeford system by Ciotti & Morganti to arbitrary separable systems. This is applied for the case when the anisotropy is parameterized by a monotonic function of the radius of Baes & Van Hese. The resulting criteria are found based on the complete monotonicity of generalized Mittag-Leffler functions.
When is an axisymmetric potential separable?
J. An
Physics , 2013, DOI: 10.1093/mnras/stt1498
Abstract: An axially symmetric potential psi(R,z)=psi(r,theta) is completely separable if the ratio s:k is constant. Here r*s=d^2(r^2*psi)/dr/d(theta) and k=d^2(psi)/dR/dz. If beta=s/k, then the potential admits an integral of the form of I=(L^2+beta*v_z^2)/2+xi where xi is some function of positions determined by the potential psi. More generally, an axially symmetric potential respects the third axisymmetric integral of motion -- in addition to the classical integrals of the Hamiltonian and the axial component of the angular momentum -- if there exist three real constants a,b,c (not all simultaneously zero, a^2+b^2+c^2>0) such that a*s+b*h+c*k=0 where r*h=d^2(r*psi)/d(sigma)/d(tau) and (sigma,tau) is the parabolic coordinate in the meridional plane such that sigma^2=r+z and tau^2=r-z.
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