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Sumathi, N.
- QoS in Routing Based on Bandwidth Measurement for Mobile Adhoc Networks
Abstract Views :181 |
PDF Views:3
Authors
Affiliations
1 SNR Sons College, Coimbatore, IN
2 NGM College (Autonomous), Pollachi, IN
1 SNR Sons College, Coimbatore, IN
2 NGM College (Autonomous), Pollachi, IN
Source
Wireless Communication, Vol 1, No 1 (2009), Pagination: 16-20Abstract
Many applications require guarantees on available bandwidth, small delays and few packet losses. To ensure the constraints, QoS is added to the network. When a node wants to transmit data, it has to consider the bandwidth consumed by the nodes in the transmission range as well as in the carrier sense range. In mobile adhoc networks, measuring the residual bandwidth is a challenging task. Residual bandwidth is estimated by subtracting the consumed bandwidth from channel bandwidth and this new available bandwidth is integrated into the routing process. This paper proposes a QoS based passive technique to measure the remaining bandwidth on the link by considering the bandwidth loss due to the control packets, backoff scheme and collision of packets. Also there is a black hole attack in MANets due to an incorrect reply from an intermediate node. This kind of attack consumes more bandwidth and uses more network resources. The attacker is identified and blocked. It is implemented using enhanced QoS AODV (Adhoc On Demand Distance Vector) routing protocol. This protocol improves performance metrics such as average end-end delay, throughput and packet delivery ratio.Keywords
AODV, Backoff, QoS.
- QoS in Routing Enabled Bandwidth Estimation Techniques for MANETS – A Survey
Abstract Views :155 |
PDF Views:1
Authors
Affiliations
1 SNR Sons College, Coimbatore, IN
2 NGM College, Pollachi, IN
1 SNR Sons College, Coimbatore, IN
2 NGM College, Pollachi, IN
Source
Wireless Communication, Vol 1, No 2 (2009), Pagination: 93-97Abstract
Now-a-days, Quality of Service (QoS) is the most important factor for Mobile Adhoc Networks (MANets). Various protocols were developed with metrics such as delay, bandwidth,jitter, energy, number of hops etc., to find the best route from source to destination. But few protocols are available to estimate the residual bandwidth along the path. Estimating the residual bandwidth at a given period of time is a difficult task in MANets. To solve this problem, intrusive and nonintrusive techniques are used. These techniques are better at sensing the channel when the carrier sensing mechanism blocks channel access. Intrusive technique uses probe packets whereas nonintrusive technique uses hello messages to know about channel utilization. These techniques perform QoS aware routing which discover the route satisfying the bandwidth requirements. In this paper, survey of these two techniques are presented.
Keywords
Quality of Service(QoS), Distributed Coordination Function(DCF), Point Coordination Function(PCF), Round Trip Time(RTT).- Synthesis and Characterisation of Macro Cyclic Vanadium Complexes
Abstract Views :202 |
PDF Views:3
Authors
S. Geetha
1,
N. Sumathi
1
Affiliations
1 Department of Science and Humanities, M. Kumarasamy College of Engineering, Thalavapalayam, Karur, Tamilnadu, IN
1 Department of Science and Humanities, M. Kumarasamy College of Engineering, Thalavapalayam, Karur, Tamilnadu, IN
Source
International Journal of Emerging Trends in Science & Technology, Vol 2, No 2 (2016), Pagination: 12-17Abstract
The design of macro cyclic ligands for the selective complexation of metal ion has been important goal of coordination and bioinorganic chemistry. The cyclam ring continues to be of special interest, and because of its ability to form stable complexes with vanadium. The presence study involves synthesis and characterization of macro cyclic vanadium complexes using synthesized 5, 7, 7, 12, 12, 14 - hexamethyl - 1, 4, 8, 11 - tetraazacyclotetradecane - 4, 11 - diene per chlorate (L1), 5, 5, 7, 12, 12, 14 - hexamethyl 1, 4, 8, 11 -tetraazacyclotetradecane dihydrade (L2) and 5, 5, 7, 12, 12, 14 - hexamethyl 1, 4, 8, 11 - tetraazatrycyclohexadecane (L3) ligands. These complexes were characterized using Fourier transform - Infrared and UV - Visible spectroscopy analysis. Added with this electrochemical studies of the complexes were carried out by cyclic voltammetry technique.Keywords
Characterization, Macro Cyclic Vanadium Complexes.- A Study on the Development of New Silicone based Polymeric Outdoor Insulator Material for Enhanced Properties
Abstract Views :128 |
PDF Views:0
Authors
Affiliations
1 University College of Engineering Kakinada, Kakinada – 533003, Andhra Pradesh, IN
2 Associate professor of EEE, UCEK, Kakinada – 533003, Andhra Pradesh, IN
3 Manobhu Technology Pvt Ltd, Bangalore – 560010, Karnataka, IN
1 University College of Engineering Kakinada, Kakinada – 533003, Andhra Pradesh, IN
2 Associate professor of EEE, UCEK, Kakinada – 533003, Andhra Pradesh, IN
3 Manobhu Technology Pvt Ltd, Bangalore – 560010, Karnataka, IN
Source
Power Research, Vol 18, No 2 (2022), Pagination: 101-111Abstract
Polymeric insulators have been increasingly popular in recent years as a result of their superior performance in contaminated environments due to their hydrophobic properties. However, research into the ageing condition of polymeric materials and their practicality for large-scale use is currently ongoing. Insulator deterioration is caused by environmental tracking and erosion factors. As insulators age, they develop immature failures and inconsistencies in their functioning. pollution performance of polymeric insulators is a vital factor in the quality and reliability of the power system. Over some time, dry band arcing can initiate the flashover and it causes degradation in the form of erosion and tracking. Polymeric insulators’ performance is heavily influenced by the constituent materials and their properties. There is a critical need to investigate innovative filler materials that can be combined with existing polymeric base materials to form composites. In this context the proposed research use silicone rubber as a base polymeric material, to which additives are added to produce three distinct composites by varying the filler concentration. Preliminary studies were made to evaluate the hydrophobicity, dielectric strength, hardness, specific gravity, tensile strength, ultimate elongation and tear strength properties of this HTV silicone rubbed-based composites by using ASTM standards and IEC 60587 requirements. Studies were also made by accelerated ageing on sample material by using the IPTE test. The results show substantial improvement in the electrical and ageing propertiesKeywords
Ageing, Dielectric Strength, Filler Material, Hardness, Inclined Plane Tracking and Erosion, Recovery of Hydrophobicity, Specific Gravity, Tear Strength, Tensile Strength, Ultimate ElongationReferences
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