iosr-JECE   Volume-10 ~ Issue-6 ~ Nov-Dec 2015

Abstract: Indus Complex at Raja Ramanna Centre for Advanced Technology (RRCAT) has two synchrotron radiation sources, Indus-1 and Indus-2. Microtron is injector to both the machines which sends electron pulses to the Booster. A new, microcontroller based, distributed mains monitoring and switching system is developed for Indus complex. It facilitates remote monitoring and switching of AC power switches to various subsystems. It includes interfacing with power switches/Miniature Circuit Breakers (MCBs) of Indus machine subsystems. This work involves development of hardware, firmware for microcontroller, implementation of communication protocol; LabVIEW based server and client application. The developed system allows remote monitoring and switching of MCBs from main control room. Keywords: Microcontroller, LabVIEW, Protocol, MCB, Power

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Abstract: In this paper, the implementation and analysis of RTS/CTS mechanism for data transfer in wireless network is being studied. The Request-To-Send (RTS) and Clear-To-Send (CTS) mechanism is widely used in wireless networks to avoid collisions due to hidden nodes by reserving the channel for transmitting data from source to destination. The collisions caused by the hidden nodes reduce the network throughput and efficiency. In RTS/CTS mechanism, RTS/CTS packets set the timer for the neighboring nodes so that these nodes defer their transmission for the entire data packet transmission period. But there may be the case when the intended transmission completes before the expiration of this timer, so a kind of delay has been developed. To reduce this delay, the proposed methodology in this paper provides RTR (Ready-To-Receive) packets along with RTS/CTS packets.

[1] Vivek Jain and Dr. Dharma P. Agrawal, Enhancing Throughput of Multihop Wireless Networks using Multiple Beam Smart Antennas, doctoral diss., University of Cincinnati, USA, 2002
[2] Priyadarshini Sabut, A Mechanism Improve the Performance of IEEE 802.11 MAC Protocol, M.Tech thesis, National Institute of Technology, Rourkela, 2011
[3] Huang Lu, Jie Li, Zhongping Dong, Yusheng Ji, CRDMAC: An Effective Circular RTR Directional MAC Protocol for Wireless Ad Hoc Networks, IEEE Conference on Mobile Ad-hoc and Sensor Networks, 2011, 231-237.
[4] Huei-Jiun Ju, Izhak Rubin, and Yen-Cheng Kua, An Adaptive RTS/CTS Control Mechanism for IEEE 802.11 MAC Protocol, IEEE conference on Vehicular Technology, 2, 2003, 1469-1473.
[5] P.Srivalli, N.Nagakumari, G.Anupama, V.Srujana, Avoidance of Collision and Overhearing in Wireless Sensor Networks, International Journal of Computer Science and Information Technologies, 2 (5), 2011, 2300-2303.

Abstract: We find difficult to detect and diagnosis the disease in olden times ,our human body is sensitive and there are lot of obstacles in which we fail to understand the disease as well as the activities that are going inside our body, so recently scientists have found out how ultrasound can be useful in medical field .In this paper we discuss about the beam former technology using VLSI architecture and FPGA implementation. Index terms:- FPGA(field programmable gate array),ultrasound, disease, obstacles, VLSI(very large scale integration)

[1]. Evolution Of Ultrasound Beamformers Kai E. Thomenius .
[2]. Adaptive Beamforming Using Lms Algorithm. - Revati Joshi , Ashwinikumar Dhal .
[3]. FPGA Implementation of Adaptive Weight Calculation Core Using QRD-RLS AlgorithmAdaptive.
[4]. VLSI Architecture: Past, Present, and Future William J. Dally and Steve Lac Computer Systems Laboratory Stanford University
[5]. VLSI Circuits for Adaptive Digital Beamforming in Ultrasound Imaging Mustafa Karaman, Abdullah Atalar, and Hayrettin Koymen
[6]. DCD Algorithm: Architectures, FPGA Implementation and Applications –Jie Liu.