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Articles by R. Ramesh
Total Records ( 10 ) for R. Ramesh
  R.M. Dilip Charaan , R. Ramesh and E. Uma
  Due to the remote wireless nature and human unattended environment of WSN, they are more vulnerable to various types of attacks and intruders may visit these networks purposely or unintentionally. The algorithms proposed in order to detect if any intruder is inside the network and to detect the wormhole and black hole attacks. In this detection technique it tries to prevent the attacks in LEACH protocol in a wireless sensor networks using the multiple base stations and key. Since, LEACH protocol is used the consumption of energy is also reduced to maximum extent. This in turn reduces the overhead and data delivery increases. As multiple base stations are employed data gets delivered cent percent. Since, LEACH protocol is used, it guarantees power supply for a considerable amount of time with extra energy. This ensures that the packet delivery ratio has increased prolonging the lifetime of the network. The individual nodes are given more security, adding security to nodes will consume more energy thus reducing the lifetime of the network. If the nodes are solar aware, the energy level gets equalised and also surplus energy may be obtained because of usage of LEACH protocol. The proposed protocols are made to detect and prevent the attacks thus controlling the overhead, increasing packets delivered and extending the lifetime of the wireless sensor networks.
  R. Ramesh and P.S. Reddy
  Several methods for testing stability of first quadrant quarter-plane two dimensional (2-D) recursive digital filters have been suggested in 1970`s and 80`s. Though Jury`s row and column algorithms, row and column concatenation stability tests have been considered highly efficient they still fall short of accuracy if the computational time is a major consideration. In this research we present a very simple method which requires very little computation time particularly when applied to the second order 2-D filter.
  P. Lakshmanan , R. Ramesh and M.A. Panneerselvam
  Investigation on performance of Unified Power Flow Controller (UPFC) in controlling the flow of power over transmission line by using different control techniques is presented in this study. Matrix Converters (MCs) capable of allowing the direct AC/AC power conversion without DC energy storage links; it is observed that the MC-based UPFC (MC-UPFC) controller reduces volume, cost and capacitor power losses with higher reliability. Genetic algorithm based solution applied to control the matrix converter switches in these converters. As a result, line active and reactive power could be directly controlled by selecting an appropriate matrix converter switching state guaranteeing good steady-state flow of power and dynamic responses. Performance of proposed technique is shown in simulation done in MATLAB. Results of genetic algorithm-SVPWM based UPFC are compared with neuro-fuzzy logic controller-SVPWM and PI controller-SVPWM based UPFC in terms of active and reactive power flows in the line.
  R. Ramesh and S. Ravichandran
  This study is to find out the nutritive value of the meat of T. brunneus and to ascertain the relationship between seasonal variations in biochemical components and reproductive cycle. The monthly variations in the biochemical constituents were estimated in different body organs such as foot, gonad, digestive gland and mantle for both male and female gastropods. Carbohydrate content of gonad is high during May 2002 in males (5.30%) and females (6.14%). The percentage of lipid is high (4.85%) in ovary during May 2002 and low in October 2002 (3.10%). In testis, the values range from 3.0 (September 2002) to 4.20% (May 2002), respectively. The gonadal tissues show major variations in lipid values, whereas the percentage variation is negligible in mantle, which ranges from 1.64-1.74% in males and 1.59-1.78% in females. The lipid valued decreases from June to October and the values showed little fluctuations from the minimum value until December. But, in the digestive gland, the percentage is higher in September 2002 in males (3.06%) and October 2003 in females (2.96%) and low in May 2003 (2.4 and 2.12%) in both the sexes. The protein contents of the digestive gland shows a clear seasonal variation, which is negatively correlated with that of other body organs.
  R. Ramesh and S. Ravichandran
  C. Yaashuwanth and R. Ramesh
  Problem statement: A Real-Time System (RTS) is one which controls an environment by receiving data, processing it, and returning the results quickly enough to affect the functioning of the environment at that time. The main objective of this research was to develop an architectural model for the simulation of real time tasks to implement in distributed environment through web, and to make comparison between various scheduling algorithms. The proposed model can be used for preprogrammed scheduling policies for uniprocessor systems. This model provided user friendly Graphical User Interface (GUI). Approach: Though a lot of scheduling algorithms have been developed, just a few of them are available to be implemented in real-time applications. In order to use, test and evaluate a scheduling policy it must be integrated into an operating system, which is a complex task. Simulation is another alternative to evaluate a scheduling policy. Unfortunately, just a few real-time scheduling simulators have been developed to date and most of them require the use of a specific simulation language. Results: Task ID, deadline, priority, period, computation time and phase are the input task attributes to the scheduler simulator and chronograph imitating the real-time execution of the input task set and computational statistics of the schedule are the output. Conclusion: The Web-enabled framework proposed in this study gave the developer to evaluate the schedulability of the real time application. Numerous benefits were quoted in support of the Web-based deployment. The proposed framework can be used as an invaluable teaching tool. Further, the GUI of the framework will allow for easy comparison of the framework of existing scheduling policies and also simulate the behavior and verify the suitability of custom defined schedulers for real-time applications.
  S. Chidambaram , A. John Peter , M.V. Prasanna , U. Karmegam , K. Balaji , R. Ramesh , P. Paramaguru and S. Pethaperuaml
  The study was aimed to identify and delineate the groundwater potable zone in and around Madurai region. The study area is composed of Charnockites and Khondalites of Archaean age. The information of lithology, geomorphology and land use/land cover was generated using the Resourcesat (IRS P6 LISS IV data) and Survey of India (SoI) toposheets of scale 1:50,000 and integrated them with GIS to identify the groundwater potable zones of the study area. On the basis of hydrogeomorphology, groundwater potential zones was identified and delineated. From the overlay analyses of landuse and EC, it is inferred that poor category groundwater is found in the scrub forest, current fallow, canal and scrub with land areas.
  R. Ramesh and S. Ravichandran
  The length-weight and other allometric relationship of Turbo brunneus from Tuticorin (Southeast coast of India) coastal waters have not been subjected to through analysis earlier. Totally 778 males and 749 females were collected for the present study. For Length-weight analysis, the males and females of Turbo brunneus were fit with linear equation individually. The present study shows that the differences in the growth rate between male and female snails may also leads to the variation. Analysis of covariance revealed significant difference between males and females. The correlation co-efficient values between length and weight in male and female were significant. Changes in the constant allometry of length-weight relationship are associated with an increase in size and sexual maturity. The correlation co-efficient values between length and weight in male and female were significant. From the results obtained through the statistical analysis on various shell characters it is found that the shell of T. brunneus also conforms to the equiangular spire model as reported in other snails having turbinate shells.
  R. Ramesh and S. Ravichandran
  Scanning Electron Microscopic studies on the radula of Turbo brunneus was made to study the anatomy of feeding apparatus. Feeding experiment was carried out to find out algal preference and rate of consumption. Study on the radula of Turbo brunneus possesses a large central rachidian tooth, five lateral teeth and many marginal teeth. The inner marginal situated towards the lateral teeth are formed of a strong extended primary cusp and a short secondary cusp along outer margin. Observation of T. brunneus in its natural habitat shows that they are mainly found in thickly grown algal fronds of Rhodophytes such as Hypnea sp. Ceramium miniatum and Gracilaria sp. Analysis on the gut content shows that the species of algae found in the gut vary during different months. The Rhodophytes dominate during most of the months. Crustose coralline algae always form a considerable part in the gut content during all seasons. Turbo brunneus consumed most of the algae fed to them, Ceramium miniatum and Hypnea muciformis are found to be higher with 3.67% and 3.46% b.wt. day-1, respectively.
  R. Hemalatha , K. Narendra Babu , M. Karthik , R. Ramesh , B. Dinesh Kumar and P. Uday Kumar
  Ocimum sanctum (O. sanctum) has gained special attention due to its biological properties, however, little is known about its immunomodulatory effects. The purpose of this study was to investigate effect of O. sanctum on inflammation and immune response and its effect on Th1/Th2 cytokine production by spleen cells of myelosuppressed mice model. Female Swiss albino mice were challenged with SRBC and then were grouped and treated with either O. sanctum methanolic extract 850 mg kg-1 or Prednisolone 5 mg kg-1 body weight for 15 days. Blood was collected on 16th day from retro orbital plexus to perform hematological and immunological tests. Bone marrow cellularity was determined and supernatants of splenocytes cultures were analyzed for Th1/Th2 cytokines by ELISA. Antioxidant activity of O. sanctum was evaluated by DPPH (2,2'-diphenyl-1-picrylhydrazyl) assay. Treatment with O. sanctum showed significant increase in bone marrow cellularity (p<0.01), total WBC count (p<0.01) and hemoglobin concentration (p<0.01). In addition, there was a significant increase in SRBC antibody titer (1:1024) compared to the control group (1:256). O. sanctum increased the production of TNF-α, IL-2, IFN- γ and IL-4 (p<0.05) significantly and decreased the production of IL-1β and NF-kB. The methanolic extracts of O. sanctum showed free radical scavenging activity at 140 μg mL-1 concentration as IC50. This study documented improved haemoglobin concentration with O. sanctum treatment. These results support the use of this herb for wound healing and infection. The results also suggest potential use of O. sanctum as adjuvant in cancer therapy, myelotoxicity and in nutritional anemia.
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