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Swaminathan, R.
- Securing WLAN Using Reconfigurable YAGI Antenna
Abstract Views :163 |
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Authors
Affiliations
1 School of Electrical Sciences, VIT University, Vellore, IN
2 Department of Computer Science and Engineering, Alagappa University, Karaikudi, IN
1 School of Electrical Sciences, VIT University, Vellore, IN
2 Department of Computer Science and Engineering, Alagappa University, Karaikudi, IN
Source
Networking and Communication Engineering, Vol 1, No 4 (2009), Pagination: 184-187Abstract
Wireless Networks are the backbone of modern communication. The development of Wireless Networks over the last decade is enormous and so the challenges are. As the signals are radiated in the free space, it is easier for unauthorized users to sniff, monitor the signal transmitted. Using the data collected, they can easily intrude the network. In this paper, we discuss on the security provided to the wireless transmission with reconfigurable antennas which are giving out various gain levels. By adjusting the gain of the yagi structures, the signal is confined within the required region. This process provides security against the intruders for WLAN.
Keywords
WLAN, Wireless Security, MIMO, MEMS, Reconfigurable Antennas, Yagi Antenna, Micro Strip Yagi Array, PIN Diode, Eavesdroppers.- Plasticity in Predation Behaviour of Carabid Beetles in Agro-Ecosystems
Abstract Views :332 |
PDF Views:142
Authors
Affiliations
1 Department of Entomology, Rajasthan College of Agriculture, Maharana Pratap University of Agriculture and Technology, Udaipur – 313001, Rajasthan, IN
1 Department of Entomology, Rajasthan College of Agriculture, Maharana Pratap University of Agriculture and Technology, Udaipur – 313001, Rajasthan, IN
Source
Journal of Biological Control, Vol 32, No 1 (2018), Pagination: 14-19Abstract
A study on the feeding behaviour of three species of Chlaenius and two species of Calosoma (Coleoptera: Carabidae), the caterpillar and semi-looper hunting predatory ground beetles in agro-ecosystems, was carried out under laboratory conditions in the Department of Entomology, Rajasthan College of Agriculture, MPUAT, Udaipur, during September to November, 2016. The carabid predator species and the second/ third instar tobacco caterpillar prey relationship followed the typical Holling’s Type II functional response. Of the three species of Chlaenius evaluated, Chlaenius udaipurensis Chanu and Swaminathan consumed the maximum prey with a preference for the second instar tobacco caterpillar. Increase in second instar caterpillar prey density from 1 to 5 resulted in an increase in mean prey consumption up to 4.4 in 24 hours. Under enhanced prey provision from 5 to 25 to Ch. udaipurensis the maximum mean consumption was 9.0; whereas, the maximum third instar caterpillar consumption was only 2.0 in 24 hours. Both species of Calosoma could kill 11 to 13 third instar tobacco caterpillars per day. Increased prey density evinced a gradual decreasing trend in the per cent feeding propensity with little variation among the species for both the genera of carabids. The relationship between prey consumption and the body mass increase for the species of Chlaenius showed significant positive correlation (r = 0.902 for II instar prey and r = 0.711 for III instar prey); similarly, the relationship for Calosoma species had significant positive correlation (r = 0.795).Keywords
Calosoma, Chlaenius, Feeding Behaviour, Functional Response.References
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