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A Survey and Experimental Review on Data Distribution Strategies for Parallel Spatial Clustering Algorithms

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Journal of Computer Science & Technology 2024年第3期39卷 610-636页

作者： Jagat Sesh Challa Navneet Goyal Amogh Sharma Nikhil Sreekumar Sundar balasubramaniam Poonam Goyal Advanced Data Analytics and Parallel Technologies Laboratory Birla Institute of Technology and Science Pilani 333031India Uber New York 11101U.S.A. Computer Science and Engineering Department University of MinnesotaMinneapolis 55455U.S.A.

The advent of Big Data has led to the rapid growth in the usage of parallel clustering algorithms that work over distributed computing frameworks such as MPI,MapReduce,and *** important step for any parallel clustering algorithm is the distribution of data amongst the cluster *** step governs the methodology and performance of the entire *** typically use random,or a spatial/geometric distribution strategy like kd-tree based partitioning and grid-based partitioning,as per the requirements of the ***,these strategies are generic and are not tailor-made for any specific parallel clustering *** this paper,we give a very comprehensive literature survey of MPI-based parallel clustering algorithms with special reference to the specific data distribution strategies they *** also propose three new data distribution strategies namely Parameterized Dimensional Split for parallel density-based clustering algorithms like DBSCAN and OPTICS,Cell-Based Dimensional Split for dGridSLINK,which is a grid-based hierarchical clustering algorithm that exhibits efficiency for disjoint spatial distribution,and Projection-Based Split,which is a generic distribution *** of these preserve spatial locality,achieve disjoint partitioning,and ensure good data load *** experimental analysis shows the benefits of using the proposed data distribution strategies for algorithms they are designed for,based on which we give appropriate recommendations for their usage.

关键词： parallel data mining data distribution parallel clustering spatial locality preservation

Non-odontogenic toothache revisited

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Comparative evaluation of artificial intelligence systems'accuracy in providing medical drug dosages:A methodological study

Open Journal of Stomatology（口腔学期刊） 2011年第3期

作者： ramesh balasubramaniam Lena N. Turner Dena Fischer Gary D. Klasser Jeffrey P. Okeson

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World Journal of Methodology 2024年第4期14卷 121-130页

作者： Swaminathan Ramasubramanian Sangeetha Balaji Tejashri Kannan Naveen Jeyaraman Shilpa Sharma Filippo Migliorini Suhasini balasubramaniam Madhan Jeyaraman Department of Orthopaedics Government Medical CollegeOmandurar Government EstateChennai 600002Tamil NaduIndia Department of Orthopaedics ACS Medical College and HospitalDr MGR Educational and Research InstituteChennai 600077Tamil NaduIndia Department of Paediatric Surgery All India Institute of Medical SciencesNew Delhi 110029India Department of Life Sciences HealthLink Campus UniversityRome 00165Italy Department of Orthopaedic and Trauma Surgery Academic Hospital of Bolzano(SABES-ASDAA)Teaching Hospital of the Paracelsus Medical UniversityBolzano 39100Italy Department of Radio-Diagnosis Government Stanley Medical College and HospitalChennai 600001Tamil NaduIndia

BACKGROUND Medication errors,especially in dosage calculation,pose risks in *** intelligence(AI)systems like ChatGPT and Google Bard may help reduce errors,but their accuracy in providing medication information remains to be *** To evaluate the accuracy of AI systems(ChatGPT 3.5,ChatGPT 4,Google Bard)in providing drug dosage information per Harrison's Principles of Internal *** A set of natural language queries mimicking real-world medical dosage inquiries was presented to the AI *** were analyzed using a 3-point Likert *** analysis,conducted with Python and its libraries,focused on basic statistics,overall system accuracy,and disease-specific and organ system *** ChatGPT 4 outperformed the other systems,showing the highest rate of correct responses(83.77%)and the best overall weighted accuracy(0.6775).Disease-specific accuracy varied notably across systems,with some diseases being accurately recognized,while others demonstrated significant *** system accuracy also showed variable results,underscoring system-specific strengths and *** ChatGPT 4 demonstrates superior reliability in medical dosage information,yet variations across diseases emphasize the need for ongoing *** results highlight AI's potential in aiding healthcare professionals,urging continuous development for dependable accuracy in critical medical situations.

关键词： Dosage calculation Artificial intelligence ChatGPT Drug dosage Healthcare Large language models

EHD friction properties of ISO VG 320 gear oils with smooth and rough surfaces

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Friction 2020年第1期8卷 164-181页

作者： balasubramaniam VENGUDUSAMY Claus ENEKES Reiner SPALLEK Klüber Lubrication München SE&Co.KG Geisenhausenerstraße 7Munich 81379Germany

The elastohydrodynamic(EHD)friction properties of seven ISO VG 320 gear oils including three polyalphaolefins(PAOs),three polyglycols(PG)and a mineral oil have been investigated in rolling/sliding conditions at six different temperatures and three *** thickness,Stribeck and traction curves have been generated using a ball‐on‐disc *** thickness results are in agreement with previous work that it is primarily controlled by pressure‐viscosity coefficient and viscosity of *** results with smooth surface show that all oils experience significant shear heating leading to friction reduction at higher strain rates or lambda ratios but only PGs reach limiting friction whereas mineral oil and PAOs do *** curves obtained at different temperatures and roughnesses enable simulating an extensive range of lubrication regimes and allow isothermal friction correction for shear *** curves with rough surfaces show an increase in friction in the lambda range of 0.5–3.5,where asperity separation varies from partial to full–indicating that roughness effects can be expected even under full film *** increase in friction is attributed to formation of a micro‐EHD region,and is seen only with mineral oil and PAOs whereas not with *** results also highlight how EHD friction properties of different family of fluids could be influenced by roughness effects,and the possible mechanisms are discussed.

关键词： ISO VG 320 gear oil roughness effect film thickness friction EHD micro‐EHD

Passivity analysis for uncertain stochastic neural networks with discrete interval and distributed time-varying delays

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Journal of Systems Engineering and Electronics 2010年第4期21卷 688-697页

作者： P.balasubramaniam G.Nagamani Department of Mathematics Gandhigram Rural University

The problem of passivity analysis is investigated for uncertain stochastic neural networks with discrete interval and distributed time-varying *** parameter uncertainties are assumed to be norm bounded and the delay is assumed to be time-varying and belongs to a given interval,which means that the lower and upper bounds of interval time-varying delays are *** constructing proper Lyapunov-Krasovskii functional and employing a combination of the free-weighting matrix method and stochastic analysis technique,new delay-dependent passivity conditions are derived in terms of linear matrix inequalities（LMIs）.Finally,numerical examples are given to show the less conservatism of the proposed conditions.

关键词： linear matrix inequality(LMI) stochastic neural network passivity interval time-varying delay Lyapunov method.

Linear matrix inequality approach for robust stability analysis for stochastic neural networks with time-varying delay

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Chinese Physics B 2011年第4期20卷 16-26页

作者： S.Lakshmanan P.balasubramaniam Department of Mathematics Gandhigram Rural University

This paper studies the problem of linear matrix inequality （LMI） approach to robust stability analysis for stochastic neural networks with a time-varying delay. By developing a delay decomposition approach, the information of the delayed plant states can be taken into full consideration. Based on the new Lyapunov-Krasovskii functional, some inequality techniques and stochastic stability theory, new delay-dependent stability criteria are obtained in terms of LMIs. The proposed results prove the less conservatism, which are realized by choosing new Lyapunov matrices in the decomposed integral intervals. Finally, numerical examples are provided to demonstrate the less conservatism and effectiveness of the proposed LMI method.

关键词： delay-dependent stability linear matrix inequality Lyapunov-Krasovskii functional stochastic neural networks

Stochastic asymptotical synchronization of chaotic Markovian jumping fuzzy cellular neural networks with mixed delays and the Wiener process based on sampled-data control

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Chinese Physics B 2013年第7期22卷 564-573页

作者： M. Kalpana P. balasubramaniam Department of Mathematics Gandhigram Rural InstituteDeemed University

We investigate the stochastic asymptotical synchronization of chaotic Markovian jumping fuzzy cellular neural networks （MJFCNNs） with discrete, unbounded distributed delays, and the Wiener process based on sampled-data control using the linear matrix inequality （LMI） approach. The Lyapunov–Krasovskii functional combined with the input delay approach as well as the free-weighting matrix approach is employed to derive several sufficient criteria in terms of LMIs to ensure that the delayed MJFCNNs with the Wiener process is stochastic asymptotical synchronous. Restrictions （e.g., time derivative is smaller than one） are removed to obtain a proposed sampled-data controller. Finally, a numerical example is provided to demonstrate the reliability of the derived results.

关键词： stochastic asymptotical synchronization fuzzy cellular neural networks chaotic Markovian jumping parameters sampled-data control

Responses of Bruguiera sexangula propagules to beneficial microbes in the nursery

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Journal of Forestry Research 2018年第4期29卷 1082-1087页

作者： Arumugam Karthikeyan Natchimuthu balasubramaniam Sivapriya Institute of Forest Genetics and Tree Breeding Coimbatore 641002 India

Bruguiera sexangula （Lout） Poir., a threatened mangrove tree, was inoculated with beneficial microbes in a nursery to assess any improvements in growth and bio- mass. From soil samples from the rhizosphere of B. sexangula in a mangrove forest in Panangadu of Kerala India, nitrogen-fixing bacteria Azotobacter chroococcum and Azospirillum brasilense were isolated. The phosphatesolubilising bacterium Bacillus megaterium and potassiummobilizing bacteria Frateruria aurantia were also isolated and cultured on suitable media. Later, ripe propagules of B. sexangula were collected from matured trees and raised in sterilized soil bags （13 × 25 cm） containing sterilized soil and sand （2：1 ratio）. The cultured beneficial microbes were propagated and used to inoculate the ripe propagules of B. sexangula and maintained in the nursery for 6 months. After 6 months, growth and biomass of the inoculated propagules were greater than for the uninoculated control propagules. Shoot length, number of leaves, stem girth and root length were also significantly greater than in the controls. This study showed that the mangrove-specific beneficial microbes influenced the growth of B. sexangula

关键词： Mangroves Bruguiera sexangula Beneficial microbes Nursery Propagules

Stability of nonlinearly-perturbed systems with time varying delay using LMIs

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Journal of Systems Engineering and Electronics 2013年第6期24卷 1011-1018页

作者： S.Jeeva Sathya Theesar P.balasubramaniam Institute for Mathematical Sciences University of Malaya Department of Mathematics Gandhigram Rural Institute-Deemed University

This paper studies delay dependent robust stability and the stabilization problem of nonlinear perturbed systems with time varying delay. A new set of sufficient conditions for the stability of open as well as close loop systems are obtained in the sense of Lyapunov-Krasovskii. To reduce the conservatism, the work exploits the idea of splitting the delay interval into multiple equal regions so that less information on the time delay can be imposed to derive the results. The derived criterion not only improves the upper bounds of the time delay but also does not require the derivative of the delay to be known at prior. Easily testable sufficient criteria are presented in terms of linear matrix inequalities. It is shown that the derived conditions are very less conservative while comparing the maximum allowable upper bound of delay with the existing results in literature.

关键词： delay dependent stability time-varying delay nonlinear perturbations