Nathan L. Johnson

Learn More
Most wireless ad hoc sensor networks are susceptible to routing level attacks, in which an adversary masquerades as a legitimate node to convince neighbouring nodes that it is the 'logical' next hop or is on a 'better' path for forwarding packets and arbitrarily drops the packets forwarded by neighbouring nodes. In this paper, we propose a Secure Unicast(More)
Capturing an e-mail worm and containing its propagation as early as possible is desirable in order to provide better protection for the networks and hosts against severe damage that may be caused by the worm. In this paper, we propose a new approach that makes use of the propagating nature of e-mail worms. This approach inserts into each client's address(More)
OBJECTIVE Normative values for pediatric heart rates during sleep are not known. The purpose of this study was to describe the average sleeping heart rate of children and to determine if age, sex, body mass index (BMI) or ethnicity is related to sleeping heart rate. METHODS Electrocardiogram (ECG) data were obtained from healthy children during in-home(More)
Background—There is increasing evidence that sleep-disordered breathing (SDB) is an independent risk factor for cardiovascular disease (CVD) in adults. C-reactive protein (CRP), a marker of systemic inflammation, is an important predictor of future cardiovascular events. The goal of this study was to quantify the associations of SDB, sleep duration, and CRP(More)
  • 1