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A Stochastic Inventory System with Postponed Demands and Infinite Pool in Discrete-Time Setup

Journal of the Operations Research Society of China 2014年第4期2卷 455-480页

作者： Velusamy Radhamani P.Chitra Devi balasubramanian sivakumar Department of Applied Mathematics and Statistics Madurai Kamaraj UnivesityMadurai 625021Tamil NaduIndia Department of Mathematics G.T.N.Arts CollegeDindigul 624005Tamil NaduIndia

In this article,we consider a discrete-time inventory model in which demands arrive according to a discrete Markovian arrival *** inventory is replenished according to an es;ST policy,and the lead time is assumed to follow a discrete phase-type *** demands that occur during stock-out periods either enter a pool which has an infinite capacity or leave the system with a predefined *** demands in the pool are selected one by one,if the on-hand inventory level is above s t 1;and the interval time between any two successive selections is assumed to have a discrete phase-type *** joint probability distribution of the number of customers in the pool and the inventory level is obtained in the steady-state *** derive the system performance measures under steady state and using these measures,the total expected cost rate of the system is *** impacts of arrival rate on the performance measures are graphically ***,we study the impact of cost on the optimal values of the total expected cost rate,inventory level and the reorder point.

关键词： (s,S)Policy Discrete-time inventory system Discrete Markovian arrival process Discrete phase-type distribution Postponed demands

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基于MATLAB上肢康复机械臂鲁棒控制研究

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系统仿真学报 2009年第2期21卷 510-513页

作者：刘珊何际平王永骥 sivakumar balasubramanian 电子科技大学自动化工程学院成都610054 华中科技大学控制科学与工程系武汉430074 美国亚利桑那州立大学生物工程系美国亚利桑那州85287

以穿戴上肢康复机械臂(RUPERT)的人体手臂为研究对象,对被控对象建立数学模型,推导鲁棒控制器,基于sim Mechanics建立仿真模型,实现上肢康复机械臂鲁棒控制系统。考虑到上肢康复机械臂是辅助上肢偏瘫患者进行康复训练并最大限度地诱发... 详细信息

以穿戴上肢康复机械臂(RUPERT)的人体手臂为研究对象,对被控对象建立数学模型,推导鲁棒控制器,基于sim Mechanics建立仿真模型,实现上肢康复机械臂鲁棒控制系统。考虑到上肢康复机械臂是辅助上肢偏瘫患者进行康复训练并最大限度地诱发患肢的主动作用,控制器中加入上肢偏瘫患者的主动作用,在MATLAB/Simulink的环境下运行。仿真结果表明,控制器能适应各种损伤程度的患者,在存在信号传输时延时,仍能保持响应速度和精度,具有很强的鲁棒性和自适应性。

关键词：鲁棒控制康复机械臂位置控制交互式控制

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Multifunctional Biocompatible Fluorescent <i>Carboxymethyl Cellulose</i>Nanoparticles

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Journal of Biomaterials and Nanobiotechnology 2012年第2期3卷 254-261页

作者： Ravindran Girija Aswathy balasubramanian sivakumar Dhandayudhapani Brahatheeswaran Sreejith Raveendran Tomofumi Ukai Takahiro Fukuda Yasuhiko Yoshida Toru Maekawa Dasappan Nair Sakthikumar Bio Nano Electronics Research Center Graduate School of Interdisciplinary New Science Toyo University Kawagoe Saitama JAPAN

A multifunctional nanoparticle based on carboxymethyl cellulose was developed. Folate group was attached to nanoparticle for specific recognition of cancerous cells and 5FU was encapsulated for delivering cytotoxicity. The whole system was able to track by the semiconductor quantum dots that were attached to the nanoparticle. The multifunctional nanoparticle was characterized by UV-VIS spectra, PL spectra, FTIR, TEM, SEM etc and was targeted to human breast cancer cell, MCF7. The biocompatibility of nanoparticle without drug and cytotoxicity rendered by nanoparticle with drug was studied with MCF7 and L929 cell lines. The epifluorescent images suggest that the folate-conjugated nanoparticles were more internalized by folate receptor positive cell line, MCF7 than the noncancerous L929 cells.

关键词： Multifunctional Carboxymethyl Cellulose Folate Nanoparticles Biocompatible

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Influence of magnetically constricted arc traverse speed (MCATS) on tensile properties and microstructural characteristics of welded Inconel 718 alloy sheets

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Defence Technology（防务技术） 2021年第4期17卷 1395-1413页

作者： Tushar Sonar Visvalingam balasubramanian Sudersanan Malarvizhi Thiruvenkatam Venkateswaran Dhenuvakonda sivakumar Centre for Materials Joining and Research(CEMAJOR) Department of Manufacturing EngineeringAnnamalai UniversityAnnamalai Nagar608002Tamilnadu StateIndia Heat Treatment and Welding Metallurgy Division(HWMD) Materials and Metallurgy Group(MMG)Vikram Sarabhai Space Centre(VSSC)ISROThiruvananthpuram695022Kerala StateIndia

The magnetically constricted arc technique was implemented to mitigate the heat input related metallurgical problems in Gas Tungsten Arc Welding(GTAW)of Inconel 718 alloy particularly Nb segregation and subsequent laves phase evolution in fusion *** paper reports the direct effect of magnetically constricted arc traverse speed(MCATS)on bead profile,tensile properties and microstructural evolution of Inconel 718 alloy sheets joined by Gas Tungsten Constricted Arc Welding(GTCAW)*** mechanism amenable for the microstructural modification and corresponding influence on the tensile properties of joints is investigated both in qualitative and quantitative manner related to the mechanics of arc constriction and *** is correlated to the solidification conditions during *** relationship between MCATS and Arc Constriction Current(ACC)was *** interaction effect on the magnetic arc constriction and joint performance was *** showed that the joints fabricated using CATS of 70 mm/min exhibited superior tensile properties(98.39% of base metal strength with 31.50% elongation).It is attributed to the grain refinement in fusion zone microstructure leading to the evolution of finer,discrete laves phase in interdendritic areas.

关键词： GTCA welding Inconel 718 alloy Magnetically constricted arc traverse speed Tensile properties Microstructure Laves phase

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Anti-dermatophytic activity of marine sponge,Sigmadocia carnosa(Dendy)on clinically isolated fungi

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Asian Pacific Journal of Tropical Biomedicine 2012年第8期2卷 635-639页

作者： NB Dhayanithi TT Ajith Kumar M Kalaiselvam T balasubramanian N sivakumar Centre of Advanced Study in Marine Biology Faculty of Marine SciencesAnnamalai University Department of Molecular Microbiology School of BiotechnologyMadurai Kamaraj University

Objective:To screen the anti-fungal effects and find out the active metabolites from sponge, Sigmadocia carnosa(***) against four dermatophytic ***:The methanol,ethyl acetate and acetone extract of marine sponge,*** was examined against Trichaphyton mentagrophytes(***),Trichophyton rubrum(***),Epidermophyton floccosum(***) and Microsporum gypseum(***) and qualitative analysed to find out the active ***:The methanol extract of sponge was expressed significant activity than ethyl acetate and *** minimum inhibitory concentration(MIC) of methanol extract of sponge that resulted in complete growth inhibition of ***,***, *** and *** were found to 125,250,250 and 250 μg/mL ***, 100%inhibition of fungal spore germination was observed in *** at 500 μg/mL concentration followed by ***,*** and *** at 1000 μg/mL concentration. Other two extracts showed weak anti spore germination activity against the tested dermatophyte *** extracts showed presence of terpenoids,steroids,alkaloids,saponins and ***:Based on the literature,this is the first study which has conducted to inhibit the growth and spore germination of dermatophytic fungi with *** research also needs to purify and characterize the secondary metabolites from the sponge,*** for the valuable source of novel substances for future drug discovery.

关键词： Dermatophytic fungi Sigmadocia Carnosa Anti-fungal activity Spore germination assay Qualitative analysis of Active compounds

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Infl uence of magnetically constricted arc traverse speed (MCATS) on tensile properties and microstructural characteristics of welded Inconel 718 alloy sheets

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Defence technology 2021年第4期

作者： Tushar Sonar Visvalingam balasubramanian Sudersanan Malarvizhi Thiruvenkatam Venkateswaran Dhenuvakonda sivakumar

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