In low-collisionality plasmas, anisotropic heat conduction due to a magnetic field leads to buoyancy instabilities for any nonzero temperature gradient. We study analogous instabilities in degenerate collisional plasmas, i.e., when the electron collision frequency is large compared to the electron cyclotron frequency. Although heat conduction is nearly isotropic in this limit, the small residua...

Abstract Thermospheric waves occurring around the time of the 14 July 2000 solar flare were investigated using the Global Ionosphere and Thermosphere Model. The simulation results showed that extensive acoustic and gravity waves were excited by the solar flare in the subsolar region. The subsolar buoyancy period at 400 km altitude was approximately 16 min. Gravity waves with frequencies lower t...

The dualism of IGP and MPLS routing has raised a debate separating the IP community into divergent groups expressing different opinions concerning how the future Internet will be engineered. This paper presents an on-line traffic engineering model which uses a hybrid IGP+MPLS routing approach to achieve efficient routing of flows in IP networks. The approach referred to as Hybrid assumes a netw...

In order to provide high quality network management, traffic scheduling and network security, we need the per flow traffic information. However, in a highspeed net link, the flows number is so large that it is infeasible to gather and process all flows’ information accurately and efficiently. Several studies showed that a small percentage of flows account for most of the total network throughpu...

We apply blind source separation techniques from statistical signal processing to separate the traffic in a mix network into either individual flows or groups of flows. This separation requires no a priori information about the individual flows. As a result, unlinkability can be compromised without ever observing individual flows. Our experiments show that this attack is effective and scalable....