Conference Papers
Permanent URI for this collectionhttps://idr.nitk.ac.in/handle/123456789/28506
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Item A dynamic approach for discovering maximal frequent itemsets(2009) Geetha, M.; D'Souza, R.J.We present a novel method, which reads the database at regular intervals as in Dynamic Itemsets Counting Technique and creates a tree called Dynamic Itemset Tree containing items which may be frequent, potentially frequent and infrequent. This algorithm requires less time to discover all maximal frequent itemsets since it involves a method for reducing the size of the database. This method prunes the transactions and items of the transactions which are not of our interest after every scan of the database. Also, this method is independent of the order of the items. © 2009 IEEE.Item Evolution of community based routing in Delay Tolerant Networks(2010) D'Souza, R.J.; Varaprasad, G.; Jose, J.; Manoj, R.A Delay Tolerant Network (DTN) is a subset of Mobile Ad Hoc Networks (MANET), where contemporaneous connectivity among all nodes doesn't exist. Making appropriate routing decision in such networks is a challenge. Researchers have addressed this issue for over a decade and have come out with several algorithms. The latest trend in this field is to utilize the power of handheld devices for transferring messages in a delay tolerant fashion. The goal of this work is to survey the evolution of various routing protocols in a DTN. © 2010 IADIS.Item Performance analysis of node-disjoint paths in Multipath routing for wireless sensor networks(2011) Murthy, G.S.; D'Souza, R.J.; Varaprasad, G.Routing in the resource constrained network is still a challenge. To increase the operational lifetme of the wireless senor networks is the major objective of energy efficeint routing protocols. Multipath routing protocols increases the QoS, network reliability, and lifetime. This work analyses the node-dsijoint paths which contribute in realising the objectives of mutlipath routing. This work proposes the three different criteria to select the node-disjoint paths between the source and sink node. They are (i) minimum hop (ii) maximum residual energy and (iii) maximum path cost. End to end delay, residual energy and throughput are the metrics considered to evaluate the performance of three different criteria to select node-disjoint paths between source and destination. © 2011 American Institute of Physics.Item Human mobility based message transfer in Delay Tolerant Networks A single relay approach(2011) D'Souza, R.J.; Jose, J.A Delay Tolerant Network (DTN) is a type of Mobile Ad Hoc Network, where end-to-end connectivity between a pair of nodes may never exist. Due to this lack of end-to-end connectivity, traditional routing methods are not suitable in a DTN. However, various approaches have been proposed to achieve message transfer in such a network. This work looks into utilizing the capacity of 802.11n wireless standard, available on the modern mobile devices for this task. Modern mobile devices are equipped with multiple wireless ports as well as ever increasing processing power and storage capacity. They are not utilized as an alternative means for message transfer, even when the infrastructure-based connectivity is not available. The mobile devices move around according to the human mobility pattern, which is semi-deterministic in nature. This work studies how this semi-deterministic nature of human mobility can be effectively utilized for message transfer in a DTN environment. Simulation shows that the existing features of mobile devices are sufficient to achieve close to 100% connection opportunities. © 2011 IEEE.Item Energy efficient node-disjoint multipath route discovery mechanism for wireless sensor networks(2011) Shiva Murthy, G.; D'Souza, R.J.; Varaprasad, G.To increase the operational lifetime of the wireless sensor network is the major objective of energy efficient routing protocols. Mutlipath routing protocols enhance the lifetime of the wireless sensor network by distributing the traffic among multiple paths instead of single optimal path. This Work proposes a low control overhead route discovery mechanism for Energy Efficient Node-disjoint Multipath Routing Protocol. The number of control messages used in the route construction is minimized. The energy spent on the route discovery mechanism is also minimized. © 2011 Springer-Verlag.Item Reliability analysis of route redundancy model for energy efficient node disjoint multipath routing in wireless sensor networks(Elsevier Ltd, 2012) Shiva Murthy, G.; D'Souza, R.J.; Varaprasad, G.The objective of every sensor node in a sensor network is to send the sensed data in the phenomena to the sink node. Many routing protocols select an optimal path to increase the network lifetime in sensor networks. The consumption by the nodes along this optimal path is high, thereby causing their early death. In the multipath routing, path reliability is high, because of the availability of alternate paths to the optimal paths. This work proposes a theoretical frame work to study the reliability analysis of route redundancy model for node disjoint multipath networks in wireless sensor networks. The reliability of route redundancy in single path and multiple paths with varied number of nodes and its probability values are discussed. © 2012 Published by Elsevier Ltd.Item Dynamic coverage by homogeneous mobile sensor nodes using tri-hexagonal scheme(Springer Verlag service@springer.de, 2014) D'Souza, R.J.; Santoshi, G.Mobile sensor nodes (MSNs) are energy constrained, recharge, and replacement of battery is not possible after deployment. They spend more energy during their traversal and can be conserved by minimizing the traversal. High degree of coverage is preferred in many applications. Energy conservation is one of the most demanded researches. MSNs with variable sensing range are best suitable in search-related operations. Degree of coverage can be increased whenever the situation demands. © 2014 Springer India.Item Mobile sensor node traversal schemes using coverage based pattern movement with uniform energy depletion(Institute of Electrical and Electronics Engineers Inc., 2014) D'Souza, R.J.; Santoshi, G.In this work a rectangular Region of interest (ROI) is covered with Mobile Sensor Nodes (MSNs) using coverage based pattern of movement. ROI is divided into equilateral triangles and squares in tesselation fashion to provide complete coverage without coverage holes. MSNs are moved along the vertices of polygons to have optimized movement cost. All MSNs should travel an approximately equal distance, otherwise the MSN which travels longer distance depletes more energy compared to the MSN which travels shorter distance. We show that, the ROI partition in tessellation fashion is application specific and plays a great role in uniform energy depletion of the MSNs during the traversal. An improper partition may lead to an unbalanced movement cost and non-uniform residual energy. © 2014 IEEE.