We measure and analyze the single-hop packet delay through operational routers in the Sprint IP backbone network. After presenting our delay measurements through a single router for OC-3 and OC-12 link speeds, we propose a methodology to identify the factors contributing to single-hop delay. In addition to packet processing, transmission, and queuing delay at the output link, we observe the pre...

In this paper we present results of Quality of Service (QoS) performance evaluation of router interfaces. We use the equipment of two main manufacturers: Cisco and Juniper. The technologies used are of Gigabit per second and above, namely Gigabit Ethernet and 2.5 Gbit/s OC-48 POS. We examine the performance of the scheduler when we enable Differentiated Services and applying different policies ...

In this paper we describe the ILA-2 rule induction algorithm which is the improved version of a novel inductive learning algorithm, ILA. We first outline the basic algorithm ILA, and then present how the algorithm is improved using a new evaluation metric that handles uncertainty in the data. By using a new soft computing metric, users can reflect their preferences through a penalty factor to c...

Network Monitoring is a base for Usage Accounting, Network Auditing, Intrusion Detection , Protocol Analysis, Flow Statistics etc. Normally, network monitoring is quite common at low broadband network, especially in 100M/10M Ethernet . While in high broadband backbone, for example Gigabit Ethernet and 2.5G POS (OC48) backbone, a lot of problems exist, including tapping point, packet loss on NIC...

For the first time, we demonstrate data transmission over a radio frequency (RF) fiber-optic link using a LiNbO3 microdisk configured to modulate an optical carrier. Initial experimental results demonstrate high-quality data transmission up to 100 Mb/s on a 8.7 GHz RF carrier. 2002 Elsevier Science Ltd. All rights reserved.

Underwater sensor networks (UWSN) are considered to be feasible and suitable for several applications. However, the characteristics of the acoustic channel must be taken into account on the evaluation of the application feasibility. The acoustic channel imposes severe limitations to the communication, such as low bandwidth, low data rates and short practical transmission ranges. Applications wi...

Many nonlinearities in neural media are strongly dependent on spike timing jitter and intrinsic dynamics of synaptic transmission. Here we are interested in the stationary density of evoked postsynaptic potentials transmitted by depressing synapses for Poisson spike trains of fixed mean rates. We present a nonperturbative iterative method for computing the stationary density over increasing int...

A simple model of COVID-19 that incorporates feedback from disease prevalence to transmission through an endogenous response human behavior does a remarkable job fitting the main features data on growth rates daily deaths observed across large number countries and states in United States 2020. This finding, however, suggests new empirical puzzle: very wedges shift holding fixed are required bot...