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Phytoplankton often face the dilemma of living in contrasting gradients of two essential resources: light that is supplied from above and nutrients that are often supplied from below. In poorly mixed water columns, algae can be heterogeneously distributed, with thin layers of biomass found on the surface, at depth, or on the sediment surface. Here, we show(More)
Security is an important concern for many Vehicular Ad hoc Network (VANET) applications. One particular serious attack, known as Sybil attack, against ad hoc networks involves an attacker illegitimately claiming multiple identities. In this paper, we present a simple security scheme, based on the difference in movement patterns of Sybil nodes and normal(More)
  • Johanna H Rosman, Jeffrey R Koseff, Stephen G Monismith, Jamie Grover, J H Rosman, J R Koseff +2 others
  • 2007
[1] Macrocystis pyrifera (Giant Kelp) forests form important habitats in temperate coastal regions. Hydrodynamics control the transport of nutrients, food particles, larvae and spores at scales ranging from boundary layers around individual blades to entire kelp forests. Our measurements include vertical profiles of current and temperature, and concurrent(More)
Vehicular Ad Hoc Network (VANET) is vulnerable to many security threats. One severe attack is Sybil attack, in which a malicious node forges a large number of fake identities in order to disrupt the proper functioning of VANET applications. In this paper, a distributed and robust approach is presented to defend against Sybil attack. Proposed scheme(More)
  • J Grover, Russ Whitehurst, Christopher T Cross
  • 2005
The Education Sciences Reform Act of 2002 (ESRA) established a new organization within the U.S. Department of Education, the Institute of Education Sciences (the Institute). The mission of the Institute is to expand knowledge and provide information on: the condition of education (through the National Center for Education Statistics); practices that improve(More)
Security issues in Vehicular Ad-Hoc Networks (VANETs) are important because of its diverse implications in safety related and congestion avoidance applications. A critical security problem in VANET is injection of false data, i.e. an attacker propagates false information to disrupt the behavior of drivers. Most of VANET applications are time critical and(More)