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Articles by S. Ravikumar
Total Records ( 4 ) for S. Ravikumar
  S. Ravikumar , S. Chandrasekaran and S. Ramesh
  The objective of the research work is to propose a safety assessment model for an automotive software design as an interacting distributed software component towards traceability. The existing challenges in the automotive software are the composability of the distributed design components and the traceability of the fully assembled or partially assembled design software components. The safety of the composable design does not only depend on the individual software component behavior but also depends on the traceability of each of them in every possible level in both the directions. In such distributed design environment, the software design components can be classified into three types as influential, in-connection and in-absentia types. The proposed research explores a formal approach for the Safety Assessment Logic (SAL) with prevailing the Safety Integrity Levels (SIL). The set of distributed parameters which may cause the risk are studied using a Safety Assessment, Design document (SAD). The distributed SADs are reported to a central server as Document as a Service (DaaS) for carrying out the safe transactions and alert messages across the system. Safety components from each category are considered like air-bag release time, anti-lock braking system and parking distance parameters are tested under various environment conditions.
  D. Pandiaraj , D. Mubarak Ali , R. Praveen Kumar , S. Ravikumar and N. Thajuddin
  Most of the marine cyanobacteria especially to the order Chroococcales, Oscillatoriales, Nostocales occur ordinarily as planktonic forms. Their taxonomic assignment was based on morphological and cytological characteristics. The genetic variation in the species and strain level morphological and cytological features is not reliable and molecular characterization of cyanobacteria is necessary for better identification. The samples were collected from Thondi and Kattumavadi in Palk Bay region of Tamil Nadu, India. Biodiversity of cyanobacteria were documented, purified and maintained. The two strains, Phormidium chlorinum NTMP01 and Jaaginema psedogeminatum NTMP02 were selected for further molecular characterization based on 16S rDNA sequence in the strain. Evolutionary relationship and secondary structure was constructed with the sequence. The sequences were submitted to GenBank with accession numbers GU812856 and GU812857.
  N. Jeyaraj , Stebin Joseph , Arun , A. Suhaila , L. Divya and S. Ravikumar
  Zooplankton plays an important role in the marine food chain as intermediate link between phytoplankton and fish. Many of them are known to play important roles in marine ecosystems, including those in the food chain and matter transfer but there are also many species whose distribution and ecology are mostly unknown. The present study accounts deals with aspect of distribution and tidal influence of zooplankton from Estuarine regions along the Northern Kerala. The samples were taken in horizontal hauls using Hydro-Bios net (15 μm mesh size and 0.5 m mouth diameter) during high and low tide. The zooplankton community consisted of 65 species. Copepoda was the most important group both in term of species number and abundance. The species documented during low tide belong to groups with average percentage composition (%) such as calonoidia (25.37), cyclopodia (7.87), Harpacticoida (10.82), copepodites (18.11), foraminifera (1.99), ciliata (18.11), chaetognatha (2.88), cladocera (6.82), isopods (2.8) and larvae (13.28). While during high tide (%) groups include calonoidia (29.34), cyclopodia (4.69), Harpacticoida (4.38). The remaining groups viz., ctenophore, doliolids, siphonophores, isopods, ostracoda, cladocera, ctenophore, decapoda and fish eggs occurred sporadically and in small numbers. The highest abundance (1096 No. L-1) was observed during high tide from Azhlithala-Station 2, while the lowest (117 No. L-1) was detected during high tide from Chittari palam-Station 2. Both diversity and evenness was higher in Azhithala-Station 1 during high tide whereas the lowest diversity was observed during low tide from Chittari palam-Station 2 and no significant differences in dominance and total taxa of the studied area. The significant negative correlation obtained between the zooplankton density and evenness (-0.954) while positive correlation (0.993) obtained between diversity index and evenness. Further, multivariate analysis such as cluster analysis and PCA was engaged to correlate the zooplankton diversity. These analyses afford a superior significant in similarity and dissimilarity with in zooplankton community and studied sites.
  B. Kaleeswaran , S. Ilavenil and S. Ravikumar
  The effect of C. dactylon incorporated into diet formulations on the growth and body composition of Indian major carp, Catla (Catla catla) were investigated in a 45 days feeding trial. Different concentration (0, 0.05, 0.5 and 5% with the total fish feed) of C. dactylon ethanolic extract was mixed with feed ingredient. The incorporation of C. dactylon mixed diet improved the feed conversion ratio and body composition in C. catla. The elevated levels of amylase and protease activity were found in hepatopancreas at 30th days of feeding trial in 0.5 and 5% level of mixed diet groups. Non-specific immune parameter of serum antiprotease activity was higher in 5% level of experimental group. The results indicate that 5% inclusion of C. dactylon mixed diet improves the growth performance, feed efficiency, body composition, digestive enzyme and antiprotease activity in C. catla. In general, this study demonstrated the benefits of incorporating C. dactylon into fish feeds.
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