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Contrast Enhancement Based Image Detection Using Edge Preserved Key Pixel Point Filtering

Computer Systems Science & Engineering 2022年第8期42卷 423-438页

作者： Balakrishnan Natarajan Pushpalatha krishnan Department of Master of Computer Applications Sona College of TechnologySalem–636005India Department of Computer Applications SRM Institute of Science and TechnologyRamapuramChennai600089India

In existing methods for segmented images,either edge point extraction or preservation of edges,compromising contrast images is so sensitive to *** Degeneration Threshold Image Detection(DTID)framework has been proposed to improve the contrast of edge filtered ***,DTID uses a Rapid Bilateral Filtering process for filtering edges of contrast *** filter decomposes input images into base layers in the DTID *** minimal filtering time,Rapid Bilateral Filtering handles high dynamic contrast images for smoothening edge *** the DTID framework,Rapid Bilateral Filtering with Shift-Invariant Base Pass Domain Filter is insensitive to *** Shift-Invariant Filtering estimates value across edges for removing outliers(i.e.,noise preserving base layers of the contrast image).The intensity values are calculated in the base layer of the contrast image for accurately detecting nearby spatial locations using Shift-Invariant base Pass Domain Filter(SIDF).At last,Affine Planar Transformation is applied to detect edge filtered contrast images in the DTID framework for attaining a high quality of the *** normalizes the translation and rotation of *** this,Degeneration Threshold Image Detection maximizes average contrast enhancement quality and performs an experimental evaluation of factors such as detection accuracy,rate,and filtering time on contrast *** analysis shows that the DTID framework reduces the filtering time taken on contrast images by 54%and improves average contrast enhancement quality by 27%compared to GUMA,HMRF,SWT,and *** provides better performance on the enhancement of average contrast enhancement quality by 28%,detection accuracy rate by 26%,and reduction in filtering time taken on contrast images by 30%compared to state-of-art methods.

关键词： Rapid bilateral filtering edge preserved filtering affine planar transformation key pixel point localization shift-invariant base pass domain filter

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Review on mechanism and process of surface polishing using lasers

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Frontiers of Mechanical Engineering 2019年第3期14卷 299-319页

作者： Arun krishnan Fengzhou FANG Centre of Micro/Nano Manufacturing Technology (MNMT-Dublin) University College Dublin Dublin 4 Ireland State Key Laboratory of Precision Measuring Technology and Instruments Centre of Micro/Nano Manufacturing Technology (MNMT) Tianjin University Tianjin 300072 China

Laser polishing is a technology of smoothening the surface of various materials with highly intense laser beams. When these beams impact on the material surface to be polished, the surface starts to be melted due to the high temperature. The melted material is then relocated from the ‘peaks to valleys’ under the multidirectional action of surface tension. By varying the process parameters such as beam intensity, energy density, spot diameter, and feed rate, different rates of surface roughness can be achieved. High precision polishing of surfaces can be done using laser process. Currently, laser polishing has extended its applications from photonics to molds as well as bio-medical sectors. Conventional polishing techniques have many drawbacks such as less capability of polishing freeform surfaces, environmental pollution, long processing time, and health hazards for the operators. Laser polishing on the other hand eliminates all the mentioned drawbacks and comes as a promising technology that can be relied for smoothening of initial topography of the surfaces irrespective of the complexity of the surface. Majority of the researchers performed laser polishing on materials such as steel, titanium, and its alloys because of its low cost and reliability. This article gives a detailed overview of the laser polishing mechanism by explaining various process parameters briefly to get a better understanding about the entire polishing process. The advantages and applications are also explained clearly to have a good knowledge about the importance of laser polishing in the future.

关键词： laser polishing surface roughness process parameters mechanism

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Controllability results for damped second-order impulsive neutral integrodifferential systems with nonlocal conditions

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控制理论与应用（英文版） 2013年第2期11卷 186-192页

作者： Ganesan ARTHI krishnan BALACHANDRAN Department of Mathematics Bharathiar University

In this paper, we establish a set of sufficient conditions for the controllability of damped second-order impulsive neutral integrodifferential systems with nonlocal initial conditions in Banach spaces. The approach used is the Sadovskii fixed point theorem combined with a noncompact condition on the cosine family of operators. An example is oresented to illustrate the result.

关键词： Controllability Damped second-order differential equations Impulsive differential equations Neutralintegrodifferential equations Nonlocal conditions

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Simultaneous Identification of Two Parameters on the Reaction Diffusion System from Discrete Measurement Data

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Chinese Annals of Mathematics,Series B 2013年第6期34卷 843-854页

作者： Soundararajan GNANAVEL krishnan BALACHANDRAN Department of Mathematics Bharathiar University

This article deals with an inverse problem of reconstructing two time independent coefficients in the reaction diffusion system from the final time space discretized measurement using the optimization method with the help of the smooth interpolation *** main objective of the article is to analyse the asymptotic behavior of the solution of the inverse problem for the linearly coupled reaction diffusion system with respect to the homogeneous Dirichlet boundary condition.

关键词： Inverse problem Optimal control Reaction diffusion systems Asymptotic convergence

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Controllability results for nonlinear impulsive integrodifferential evolution systems with time-varying delays

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控制理论与应用（英文版） 2013年第3期11卷 415-421页

作者： Bheeman RADHAkrishnan krishnan BALACHANDRAN Department of Applied Mathematics & Computational Sciences PSG College of Technology Department of Mathematics Bharathiar University

In this paper, we study the controllability results for the nonlinear impulsive integrodifferential evolution systems with time-varying delays in Banach spaces. The sufficient conditions of exact controllability is proved under without assuming the compactness of the evolution operator. The results are obtained by using the semigroup theory and the Schafer fixed point theorem.

关键词： Controllability Impulsive integrodifferential system Evolution operator Time varying delay Fixed point theorem Semigroup theory

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Self-renewal of peripheral nerve resident macrophage:does it represent a unique activation status?

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Neural Regeneration Research 2022年第5期17卷 999-1000页

作者： Maricris Bautista Anand krishnan Department of Anatomy Physiologyand PharmacologyCollege of MedicineUniversity of SaskatchewanSaskatoonSKCanada Cameco MS Neuroscience Research Centre(CMSNRC) University of SaskatchewanSaskatoonSKCanada

Macrophages are immune cells of myeloid origin and are present in almost all *** perform a wide variety of functions contributing to tissue development,homeostasis,pathogenesis,and repair(Wynn et al.,2013).Strikingly,macrophages residing at different tissues,and at different compartments of an individual tissue,demonstrate enormously diverse molecular characteristics(Gordon and Taylor,2005).

关键词： al. homeostasis macrophage

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Threshold Chloride Concentration for Passivity Breakdown of Mg-Zn-Gd-Nd-Zr Alloy (EV31A) in Basic Solution

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Acta Metallurgica Sinica(English Letters) 2017年第4期30卷 352-366页

作者： Jakraphan Ninlachart krishnan S. Raja Chemical and Materials Engineering University of IdahoMoscow ID 83844-1021 USA

Mg-Zn-Gd-Nd-Zr alloy （EV31A） is a heat-treatable magnesium （Mg） cast alloy that can be used up to 200 ℃ for automobile and aerospace applications. This alloy has excellent mechanical properties （ultimate tensile strength： 280 MPa at room temperature, and -230 MPa at 200 ℃） and improved corrosion resistance. Electrochemical corrosion studies were conducted on this alloy under different heat treatment conditions in 0.1 M NaOH solution with the addition of 0-1000 ppm of chloride. The alloy showed excellent passivity in the 0.1 M NaOH solution. The passive potential range typically extended to more than 1.2 VAg/AgCl. The transpassive potential was observed to be dependent on heat treatment condition of the alloy. More than 80 ppm of chloride was required to induce passivity breakdown in any heat treatment condition. Peak aging at 200 ℃ for 16 h imparted better resistance for localized corrosion than other heat-treated con- ditions. The alloy in the as-received condition showed the highest passivation kinetics due to its smaller grain size that possibly increased the diffusion of reactive elements to form protective oxide. The passive film of the EV31A alloy showed n-type semiconductivity with a charge carrier density of - 2 × 10^21 cm^- 3 with no chloride addition. The charge carrier density increased with chloride addition in the electrolyte which could be correlated with the susceptibility to localized corrosion.

关键词： Magnesium alloy Corrosion Passivation Chloride

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Controllability results for semilinear impulsive integrodifferential evolution systems with nonlocal conditions

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控制理论与应用（英文版） 2012年第1期10卷 28-34页

作者： Bheeman RADHAkrishnan krishnan BALACHANDRAN Department of Mathematics Bharathiar University

In this paper, we establish sufficient conditions for the controllability of a class of semilinear impulsive integrodifferential systems with nonlocal initial conditions in Banach spaces. We derive the conditions using Hausdorff measure of noncompactness, Sadovskii fixed point theorem and operator semigroups in particular dropping compactness of the operator.

关键词： Controllability Impulsive integrodifferential system Evolution operator Nonlocal initial conditions Condensing operator Sadovskii fixed point theorem Semigroup theory

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Robust stability criteria for uncertain linear systems with interval time-varying delay

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控制理论与应用（英文版） 2011年第4期9卷 559-566页

作者： krishnan RAMAkrishnan Goshaidas RAY Department of Electrical Engineering Indian Institute of Technology Kharagpur

This paper considers the robust delay-dependent stability problem of a class of linear uncertain system with interval time-varying delay and proposes less conservative stability criteria for computing the maximum allowable bound of the delay range. Less conservatism of the proposed stability criteria is attributed to the delay-central point method of stability analysis, wherein the delay interval is partitioned into two subintervals of equal length, and the time derivative of a candidate Lyapunov-Krasovskii functional based on delay decomposition technique is evaluated in each of these delay segments. In deriving the stability conditions in LMI framework, neither model transformations nor bounding techniques using free-weighting matrix variables are employed for dealing the cross-terms that emerge from the time derivative of the Lyapunov-Krasovskii functional; instead, they are dealt using tighter integral inequalities. The proposed analysis subsequently yields a stability condition in convex LMI framework that can be solved using standard numerical packages. For deriving robust stability conditions, two categories of system uncertainties, namely, time-varying structured and polytopic-type uncertainties, are considered. The effectiveness of the proposed stability criteria is validated through standard numerical examples.

关键词： Lyapunov-Krasovskii functional Robust stability Interval time-delay Delay-range-dependent stability Linear matrix inequality

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Throughput Analysis of IEEE 802.11 Multirate WLANs with Collision Aware Rate Adaptation Algorithm

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International Journal of Automation and computing 2010年第4期7卷 571-577页

作者： Dhanasekaran Senthilkumar A.krishnan Department of Electronics and Communication Engineering K.S.Rangasamy College of Technology

This paper presents a mathematical model that analyzes the throughput of the IEEE 802.11b distributed coordination function （DCF） with the collision aware rate adaptation （CARA） algorithm. IEEE 802.11 WLANs provide multiple transmission rates to improve system throughput by adapting the transmission rate to the current channel conditions. The system throughput is determined by some stations using low transmission rates due to bad channel conditions. CARA algorithm does not disturb the existing IEEE 802.11b formats and it can be easily incorporated into the commercial wireless local area networks （WLAN） devices. Finally, we verify our findings with simulation.

关键词： Distributed coordination function (DCF) IEEE 802.11 collision aware rate adaptation (CARA) multirate medium access control (MAC).

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