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Articles by R. Venkatesan
Total Records ( 4 ) for R. Venkatesan
  R. Venkatesan and A. Sabari
  Multicast is often used for streaming multimedia applications and offers efficient delivery of data on internet from a source to multiple destinations. A secure and authenticated multicast method for message delivery is based on large scale content distribution. Even though multicast has been very successful at providing an efficient, best-effort data delivery service to huge groups under Gaussian channel and geographic protocol, but poses significant challenges in providing a scalable and secure platform for social networking. In this research, a method called Scalable Secure Multicasting (SSM) is designed based on large scale content distribution to ensure group communication between users in Social Networking. The proposed method is aimed at encouraging users to actively participate in the overlay activities and discourages them from indulging in illegal usage of copyrighted data. The method SSM employs a Feature-based Public Key Broadcast Encryption with trust designer that serves as an effective authentication mechanism, ensuring secure message transfer. Next, an efficient Incremental Hash-based Integrity Validation is designed to ensure integrity of the message being broadcasted and therefore minimizing the computation overhead. Finally, a transformation algorithm is implemented to optimize multicasting by merging similar multicast groups in a principled fashion aiming at improving the scalability when the social network is used by large number of groups. Simulation results are presented to show the efficiency and performance of the proposed method. Using extensive simulation, we show that the proposed method is efficient by achieving secure message transfer, maximizes the scalability by minimizing the packet loss rate and minimizes the computation overhead.
  V. Ilayaraja and R. Venkatesan
  In wireless multimedia transmission, scheduling mechanism needs to be designed in an efficient manner to maintain the traffic stream and enhance the Quality of Service (QoS) for Variable Bit Rate traffic (VBR). In this study, an Enhanced Traffic Aware Scheduling (ETAS) Protocol for VBR Traffic in IEEE 802.11e Wireless Local Area Network (WLAN) is proposed. Here, a queue length notification scheme is used for efficient transmission of queue length and data rate information to QoS Access Point (QAP). Based on the queue length information, Transmission Opportunity (TXOP) is estimated. In case, the data rate is high, overboost scheduling algorithm is used which efficiently deals with traffic stream by transferring excess data to the Enhanced Distributed Channel Access (EDCA). Moreover, to recover the lost TXOP an Unused Time Shifting Scheduling Algorithm is used. Simulation results show that the proposed protocol achieves better bandwidth utilization for VBR traffic with reduced delay.
  R. Manikandan and R. Venkatesan
  This paper aims to study on the feasibility of micron size hole manufacturing using micro Electric Discharge Machining (Micro-EDM). Main and auxiliary unit of the micro-EDM machine tool and their functions are described in some detail. The technological and electrical parameters that are effective in Micro-EDM are stated explicitly. Geometry of the machined micro-holes and resolidified material around the hole entrance are observed. Several descriptive pictures, obtained by Scanning Electron Microscope (SEM) are included to understand the phenomena. EDM is an important process in the field of micro machining. However, a number of issues remain to be solved in order to successfully implement it an industrial environment. This study investigates the optimization of machining parameters for machining in micro EDM. Here, the overcut and the Metal Removal Rate (MRR) and Tool wear ratio are targeted. The study focuses on a specific combination of electrode and work piece material and proposes a typical method for micro EDM process optimization. The cutting of the Inconel 718 using Micro EDM with a brass electrode by using Taguchi methodology has been reported. The Taguchi method is used to formulate the experiment layout, to analyze the effect of each parameter on the machining characteristics and to predict the optimal choice for each EDM parameters like Discharge current, Pulse on time, Pulse off time. It found that these parameters have a significant influence on the machining characteristics such as Metal Removal Rate (MRR), Overcut and Tool wear ratio.
  R. Venkatesan , K.P. Kumaraguru Vasagam and T. Balasubramanian
  Marine microalgal species such as Skeletonima costatum and Chaetoceros coarctatus were cultured in Discharge Water (DW) from shrimp culture pond to recover the organic and inorganic nutrients released as waste. Total nitrogen (N), nitrate-N and total phosphorus in the DW were observed significantly higher and their mean values were 95.261, 32.6 and 11.312 mg L-1, respectively. Algal species were cultured in processed DW under 12 h light/12 h dark condition with light intensity of 6000-7000 Lux and compared with cultures made in standard Conway medium which served as a control. Cell density was obtained higher over the control by 30.1 and 20.0% in S. costatum and C. coarctatus respectively in DW. While the rate of nitrogen removal was between 42.3 and 47.2%, the phosphorus removal efficiency was 20.8 and 17.7% in S. costatum and C. coarctatus respectively. The present study inferred that, as it is a low cost technology for microalgal production as well as a mean for waste water treatment, marine microalgal culture in DW from shrimp farm will be a two in one approach towards sustainable utilization of aquatic resource.
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