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- 저자 : Senthil, Chenrayan (검색결과 339 건)
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Senthil kumar Raman,Heuy Dong Kim 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
The unique characteristics of supercritical carbon dioxide (SCO₂) are reason enough to find its use in various engineering applications. But still usability of SCO₂ is not completely explored due to lack of knowledge about its real gas effects. The present study mainly addresses the real gas effects on supercritical CO₂ flow through a supersonic convergent-divergent nozzle. With series of theoretical equations which are based on one-dimensional gas dynamics theory, computer program has been developed to predict the compressible flow characteristics of supercritical CO₂. With the data obtained from the computer program, properties of supercritical CO₂ near critical point is theoretically analyzed with different EOS. Computational analysis also has been carried out to reasonably predict the SCO₂ flows. The deviation in prediction of properties of SCO₂ by a EOS from other one is addressed. Several types of the equations of state were applied to the compressible Navier-Stokes equations. For effective use of available EOS, an attempt is made by coupling ideal gas EOS and real gas EOS to analyze the real gas effect of SCO₂. These results are compared with the computational results of SCO₂ flow through convergent divergent nozzle with a single real gas EOS. The obtained solutions were used to investigate the generic features of supercritical CO₂ flow, in terms of shock wave location, flow choking, total pressure loss, pressure recovery, etc.
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A Simple Method for Solving Type-2 and Type-4 Fuzzy Transportation Problems
Senthil Kumar, P. Korean Institute of Intelligent Systems 2016 INTERNATIONAL JOURNAL of FUZZY LOGIC and INTELLIGE Vol.16 No.4
In conventional transportation problem (TP), all the parameters are always certain. But, many of the real life situations in industry or organization, the parameters (supply, demand and cost) of the TP are not precise which are imprecise in nature in different factors like the market condition, variations in rates of diesel, traffic jams, weather in hilly areas, capacity of men and machine, long power cut, labourer's over time work, unexpected failures in machine, seasonal changes and many more. To counter these problems, depending on the nature of the parameters, the TP is classified into two categories namely type-2 and type-4 fuzzy transportation problems (FTPs) under uncertain environment and formulates the problem and utilizes the trapezoidal fuzzy number (TrFN) to solve the TP. The existing ranking procedure of Liou and Wang (1992) is used to transform the type-2 and type-4 FTPs into a crisp one so that the conventional method may be applied to solve the TP. Moreover, the solution procedure differs from TP to type-2 and type-4 FTPs in allocation step only. Therefore a simple and efficient method denoted by PSK (P. Senthil Kumar) method is proposed to obtain an optimal solution in terms of TrFNs. From this fuzzy solution, the decision maker (DM) can decide the level of acceptance for the transportation cost or profit. Thus, the major applications of fuzzy set theory are widely used in areas such as inventory control, communication network, aggregate planning, employment scheduling, and personnel assignment and so on.
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A Simple Method for Solving Type-2 and Type-4 Fuzzy Transportation Problems
P. Senthil Kumar 한국지능시스템학회 2016 INTERNATIONAL JOURNAL of FUZZY LOGIC and INTELLIGE Vol.16 No.4
In conventional transportation problem (TP), all the parameters are always certain. But, many of the real life situations in industry or organization, the parameters (supply, demand and cost) of the TP are not precise which are imprecise in nature in different factors like the market condition, variations in rates of diesel, traffic jams, weather in hilly areas, capacity of men and machine, long power cut, labourer’s over time work, unexpected failures in machine, seasonal changes and many more. To counter these problems, depending on the nature of the parameters, the TP is classified into two categories namely type-2 and type-4 fuzzy transportation problems (FTPs) under uncertain environment and formulates the problem and utilizes the trapezoidal fuzzy number (TrFN) to solve the TP. The existing ranking procedure of Liou and Wang (1992) is used to transform the type-2 and type-4 FTPs into a crisp one so that the conventional method may be applied to solve the TP. Moreover, the solution procedure differs from TP to type-2 and type-4 FTPs in allocation step only. Therefore a simple and efficient method denoted by PSK (P. Senthil Kumar) method is proposed to obtain an optimal solution in terms of TrFNs. From this fuzzy solution, the decision maker (DM) can decide the level of acceptance for the transportation cost or profit. Thus, the major applications of fuzzy set theory are widely used in areas such as inventory control, communication network, aggregate planning, employment scheduling, and personnel assignment and so on.
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Senthil Nathan, S.,Choi, Man-Young,Paik, Chae-Hoon,Seo, Hong-Yul Elsevier 2007 Pesticide biochemistry and physiology Vol.88 No.3
<P><B>Abstract</B></P><P>The toxicity and physiological (enzyme and nutritional indices) effect of <I>Dysoxylum</I> triterpenes 3β,24,25-trihydroxycycloartane and beddomei lactone were evaluated on the rice leaffolder <I>Cnaphalocrocis medinalis</I> (Guenée). The LC<SUB>50</SUB> [6.66ppm (SD=0.31), 5.79ppm (SD=0.33) for 3β,24,25-DHCL and BL, respectively] and LC <SUB>90</SUB> [14.63ppm (SD=0.36), 13.49ppm (SD=0.27) for 3β,24,25-DHCL and BL, respectively] were identified by probit analysis. Fourth instars were exposed to various concentrations (1.5, 3, 6, and 12ppm) of <I>Dysoxylum</I> triterpenes. Results showed that treated larvae exhibited reduced food consumption and enzyme activity. Food consumption, digestion, relative consumption rate, efficiency of conversion of ingested food, efficiency of conversion of digested food, and relative growth rate values declined significantly but the approximate digestibility of treated larvae was significantly higher as a result of treatment (in particular 6 and 12ppm). Likewise, the gut enzymes acid phosphatases, alkaline phosphatases, and adenosine triphosphatases were significantly inhibited by the <I>Dysoxylum</I> triterpenes. The high biological activity of these triterpenes from <I>Dysoxylum</I> sp. could be used as an active principle during the preparation of botanical insecticides for insect pest like rice leaffolder.</P>
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An Energy and Deadline-Aware Scheduler with Hybrid Optimization in Virtualized Clouds
Senthil Kumar Kandasamy,Anandamurugan Selvaraj 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.6
For virtualized cloud computing systems, energy conservation is a major challenge. It leads to several advantages like reducing running costs, protecting the environment, and bringing down running costs. Simultaneously, a strategy for energy-efficient task scheduling can be a suitable method to attain these objectives. Another major challenge during scheduling is mapping cloud resources to various user requests within a user-defined deadline with minimal consumption of cloud resources. In this work, using intelligent metaheuristic algorithms for processing the requests and tasks of users to maintain deadlines and to minimize the energy usage is proposed. This work proposed an energy and deadline aware scheduling method in a heterogeneous and virtualized cloud for resolving energy consumption issues. For this work, a mutated particle swarm optimization (PSO), mutated artificial bee colony (ABC), and hybrid ABC–PSO were used to reduce the average makespan, increasing the resource utilization under a constraint of a deadline. For this model, the tasks are arranged in an ascending order based on the priority of length, label the state of the VM, thus achieving the constraint of a deadline after which the tasks are mapped to a VM with a minimum processing time. The idea behind the proposed algorithm was improving both scheduling and deadline in cloud computing using both local and global algorithms. The outcome of the simulation shows that the method will help in attaining good performance compared to the current techniques.
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Senthil, Karuppanan,Yong, Kijung IOP Pub 2007 Nanotechnology Vol.18 No.39
<P>Stoichiometric tungsten oxide (WO<SUB>3</SUB>) nanorods are synthesized on tungsten (W) substrates by a high-temperature, catalyst-free, physical deposition process and by subsequent annealing in oxygen atmosphere. Tungsten oxide nanorods are grown by thermal evaporation of WO<SUB>3</SUB> powder at elevated temperature in a tube furnace. XRD, TEM and XPS analysis shows that the as-grown nanorods are single crystalline and non-stoichiometric (WO<SUB><I>x</I></SUB>). Annealing of WO<SUB><I>x</I></SUB> nanorods at 700 °C under oxygen atmosphere has led to the formation of stoichiometric WO<SUB>3</SUB> as evidenced by XRD, XPS and Raman analysis. </P>
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Senthil Kumar Ponnusamy,Saravanan Anbalagan,Sundar Rajan Panneer Selvam,Abishek Sankaranarayan,Abhishek Dutta 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.9
The present research introduces a new concept on rapid removal of Pb(II) ions from wastewater using novel agro-based material. The two types of materials such as sulfuric acid modified Caryota urens seeds (SMCUS) and ultrasonic assisted Caryota urens seeds (UACUS) were prepared and performance was compared for Pb(II) ions removal. The functional groups available on the C. urens were discussed by using FT-IR report. Adsorption influencing parameters such as initial metal ion concentration, pH, contact time, adsorbent dosage and temperature were studied to predict the optimum conditions. Several isotherm and kinetic models were applied to examine the experimental data. The present adsorption-adsorbate system best obeys the Freundlich and pseudo-first-order models. Langmuir monolayer capacity of the SMCUS and UACUS for Pb(II) ions was found to be 93.7 and 175.9mg/g, respectively. Thermodynamic parameters explain that the adsorption of Pb(II) ions was spontaneous and exothermic.
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Senthil Kumar Thamilarasan,Jeong Suk Hyeon Han,Jong-In Park,Ill-sup Nou 한국육종학회 2015 한국육종학회 심포지엄 Vol.2015 No.07
Bulb onion (Allium cepa) is one of the second most widely cultivated and consumed vegetable crops in the world. During winter where the temperature can be as low, plant could get cold injury and limit the production of bulb onion. However, the genomic resources available for bulb onion are still very limited. To date, no studies about heritably durable cold and freezing tolerance were carried out in bulb onion genotypes using high-throughput sequencing technology was applied. We sequenced cold (2°C) freezing (-5 and -15°C) treated and control (25°C) samples of contrasting genotypes of A. cepa lines and obtained 4,52,194,370 total high quality reads. After de novo assembly reads were assembled into 54,047 genes finally generated with an average length of 1,331 bp. Based on the similarity search aligning all genes with known public non-redundant (NR) database, including Swiss-prot, KEGG and COG. Differentially expressed genes (DEGs) were investigated using FPKM method. Overall, 92,862 genes were differentially regulated in all libraries were identified. Additionally, increase our understanding of the DEGs, we performed GO and KEGG pathway enrichment analyses. Based on FDR<=0.01 value in cold freezing tolerant line candidate genes were selected and discussed. Finally 25 candidate genes were examined using qRT-PCR were differentially regulated and known to be associated with cold and freezing stresses. Moreover, in silico prediction of putative molecular marker 4,437 SSRs and 6,076 SNPs. Our study is the first to provide the transcriptome sequence resource of Allium spp., for cold and freezing stress. We identified large set of genes to determine its DEGs profile under cold and freezing condition using two different genotypes. These data provides a valuable resource of genetic and genomic studies of Allium spp.
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Experimental investigation of palm kernel fibre reinforced epoxy based composite
Senthil Kumar KM,Thirumalai Ramanathan,Seenivasan Murugesan,Venugopal Thangamuthu 한양대학교 세라믹연구소 2021 Journal of Ceramic Processing Research Vol.22 No.6
The composite specimen consisting of eight layers of palm kernel and coir fibers with different weight proportions wereprepared through hand lay-up technique. The experimental investigation of delamination factor, surface roughness, machiningforce and tool life are carried out in this work. The hand layup technique was used for the processing of the compositematerial, which constitutes the epoxy resin as the matrix material and fibre as the reinforcing material. Also silicon carbidewas added to the composite material in several percentages to increase the strength of the composite material. The specimenwas tested according to the testing standards and the values of surface roughness, delamination factor, machining force andtool life were recorded. ANOVA and Taguchi analysis for all responses were carried out and discussed here.
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