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Articles by S. Natarajan
Total Records ( 6 ) for S. Natarajan
  N. Ramadass , S. Natarajan and J. Raja Paul Perinbam
  Present trends in embedded system design indicates that the future world of computing will be ruled by System-on-Chip (SoC) platforms consisting of configurable components. Commercially available SoC platforms provide only limited amount of static customization of hardware. Now that SoC technology is emerging, single-chip multi processors are becoming feasible. Designing using such platforms has two drawbacks. First is the complexity of their on-chip interconnects. Second is the ambiguity regarding at what level software should be integrated. However, with increasing applications, diversity, time-varying requirements and convergence of multiple functionalities in a single embedded system, this is a growing demand for SoC that can be dynamically configured to adapt to changing requirements. In this fact, the design and implementation of a self-modifiable system is described. The reconfiguration logic and embedded application execute concurrently. Also, the data required for each reconfiguration is generated on demand. The viability of design is validated with an implementation of reconfigurable display controller. The methodology and design flow are also discussed. The developed system is currently being used to implement a reconfigurable speech codec.
  S. Venkatesh , S. Mohamed Ghouse and S. Natarajan
  In the context of recent advances in modern power systems that utilize power electronic components for power delivery, cables are prone to High Voltage High Frequency (HFHV) oscillations which may be as a consequence of resonance, over-voltages due to fast switching operations etc., leading to undesirable degradation of insulation. Further, a few current studies by researchers have revealed that there is need for alternate strategies other than the classical insulation integrity tests that need to be formulated to study the degradation of insulation systems due to the influence of high frequency high voltages. In this research, studies are carried out to analysis the breakdown characteristics of cross linked polyethylene (XPLE) insulated power cable by subjecting HVHF oscillations generated using double tuned circuit. HVHF oscillations are generated in the form of damped oscillations and applied to XLPE cable insulation. Breakdown performance due to different ranges of high frequencies are generated and applied as repetitive HVHF oscillation on XLPE cable samples. The same sample is also subjected to high voltage with 50 Hz power frequency, switching and lightning over-voltages for carrying out detailed comparison on the breakdown characteristics. Further, analysis is also carried out to compare breakdown voltage characteristics of the XLPE insulation for varying HFHV oscillations that are most prevalent in systems pertaining to distribution voltage levels.
  S. Natarajan , J. Kalyana Sundar , S. Athimoolam and Bikshandarkoil R. Srinivasan
  The synthesis and characterization of a new Sr(II) coordination polymer (CP), [Sr(H2O)(H-gly)2Cl2] n (1) (H-gly = glycine), is described. Compound 1 crystallizes in the centrosymmetric orthorhombic space group Pcnb and its structure consists of a central Sr(II), a water molecule, a zwitterionic glycine, and a chloride. The central metal is nine coordinate, bonded to six oxygens from four different bridging H-gly ligands, two symmetry-related chlorides, and a terminal water molecule. The μ2-tridentate bridging zwitterionic glycine results in the formation of a 1-D CP with an Sr…Sr separation of 4.560 Å across the chain. The chloride, H-gly, and coordinated water are involved in five varieties of hydrogen bonding. A comparative study of the structural chemistry of several alkaline-earth glycine compounds is described.
  G. Anandha Babu , R. Perumal Ramasam , P. Ramasamy and S. Natarajan
  Single crystals of benzophenone hydrazone (BH) were successfully grown by slow evaporation method at constant temperature, 30 °C. The crystal structure of BH has been determined, and it belongs to the noncentrosymmetric space group P21. The grown crystal has been characterized by FT-IR). The optical transition and the lower cutoff wavelength of the BH have been identified by UV–vis–NIR studies. Thermo gravimetric analysis and differential thermal analysis have been carried out; the BH was found to be thermally stable up to 104 °C. Powder second harmonic generation (SHG) was investigated to explore its nonlinear optical (NLO) properties. The high SHG is due to one dimensional charge transfer between amine and phenyl group. Both the real εr and imaginary εi components of the dielectric constant have been calculated as functions of photon energy.
  A. Vinay and S. Natarajan
  Data sharing and large acceptance of cloud computing is rapid development in cloud storage. The guarantee of the customer’s data protection is becoming that delay wide acceptance of cloud computing. To secure data sharing of cloud computing is talented explanation of third party re-encryption. A data holder to encrypt distributed data in cloud storage to permits under its individual public key which is changed by a semi-trusted cloud server into a planned encryption for the genuine beneficiary for access control. This study provides a solid and inspirational review of third party re-encryption from dissimilar perspectives to recommend an improved accepting of this primitive. In exacting, the third party re-encryption is evaluated by observing the protection methods and the intend philosophy. In addition, the possible applications and additions of third party re-encryption have also been conversed.
  K. Manikandan , S. Natarajan and R. Sivasamy
  Hydro-chemical ground water data of coastal region of Cuddalore district was subjected to cluster analysis to group the ground water based on its homogeneity and to find out the influencing factor on ground water quality. The twenty-seven water samples were collected during summer and post monsoon season of 2007 and characterized for nine physico-chemical parameters. These physicochemical parameters were subjected to cluster analysis. From the analysis, four and five distinct clusters were identified in summer and post monsoon season respectively. The different cluster recognized in the cluster analysis differed in chemical composition. It also had significant correlation with spatial distance from the sea as well as landform.
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