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Understanding outage and failure characteristics of a network is important to assess the availability of the network, determine failure source for trouble-shooting, and identify weak areas for network availability improvement. However, there has been virtually no failure measurement and analysis on access networks. In this paper, we carry out an in-depth(More)
Despite various high-tech Vehicle-to-Vehicle (V2V) and Vehicle-to-Infrastructure (V2I) communications that have been developed for enhancing traffic safety, protecting vulnerable road users (VRU), such as pedestrians and bicyclists from the vehicles and trains still heavily relies on the traditional sound warning method. Furthermore, as smart devices(More)
We propose Adaptive Geo-Source Multicast Routing (AGSMR) for WSNs. It addresses the scalability issue of previous location based stateless multicast protocols in WSNs. AGSMR is a novel stateless mul-ticast protocol that optimizes the location-based and source-based mul-ticast approaches in various ways. First, it saves the cost of a tree building by using(More)
A wormhole attack is one of the most challenging yet detrimental security issues in mobile wireless sensor networks (mWSNs). However, as most of the existing countermeasures are designed mainly for fixed WSNs using hardware devices or information of entire WSNs (topology or statistical), they cannot be effectively used in mWSNs. In this paper, we propose,(More)
Traffic and resource monitoring is the essential function for large-scale enterprises, service providers, and network operators to ensure reliability, availability, and security of their resources. For this reason, many large-scale enterprises and providers have been investing in various standalone dedicated monitoring solutions. However, they find the cost(More)