We propose a new parallel topology discovery algorithm for irregular, mesh-connected networks with unidirectional links and wormhole routing. An algorithm of this type was developed for the ATOMIC high speed local area network to avoid the need for manually updating routing tables. Similar needs may arise in wireless networks where channels may be unidirectional because of limited transmission ...

Recent development in vehicle-to-vehicle (V2V) communication has increased the need for simulation to test and analyze protocols for this emerging technology. Packet level network simulators lack a realistic V2V channel module which would allow having accurate simulations. This thesis proposes an efficient method for generating a V2V channel in a packet network simulator. This method, based on ...

Under link-state routing protocols such as OSPF and IS-IS, when there is a change in the topology, propagation of link-state announcements, path recomputation, and updating of forwarding tables (FIBs) will all incur some delay before traffic forwarding can resume on alternate paths. During this convergence period, routers may have inconsistent views of the network, resulting in transient forwar...

The paper proposes an all-optical 1×M router architecture based on pulse-positionmodulation header processing (PPM-HP) scheme for packet routing in all-optical highspeed wavelength division multiplexing (WDM) packet switching network. The router is mainly comprised of all-optical clock extraction, pulse-position-modulation header extraction, continuous-wave (CW) sources, wavelength conversion m...

For Networks with t+1 link disjoint spanning trees, we propose a fault tolerant deterministic and adaptive unicast wormhole routing technique which can tolerate up to 100% of all faults involving up to t link faults and high percentage of faults involving more than t links. This technique provides deadlock prevention with message delivery times that is almost identical to the case without fault...

Under link-state routing protocols such as OSPF and IS–IS, when there is a change in the topology, propagation of link-state advertisements, path recomputation, and updating of forwarding tables (FIBs) will all incur some delay before traffic forwarding can resume on alternate paths. During this convergence period, routers may have inconsistent views of the network, resulting in transient forwa...

label switching technology is a flexible and high performance method for forwarding layer three packets that are mapped to layer two flows. each label switch router, lsr, needs a specific label for every flow, where the number of labels depends on the mapping and granularity of flows. data and control driven methods are the most significant and popular methods in label mapping policy. the above...

This paper presents a control method which combines sliding mode approach of direct power control and operates with constant switching frequency. This novel scheme Sliding Mode Constant Switching Frequency Direct Power Control (SM-CSF-DPC) employs a nonlinear sliding mode control (SMC) approach to directly calculate the required converter’s control voltage. The constant switching frequency (CSF...

this paper presents a novel control method to improve the efficiency of low-voltage dc-dc converters at light loads. pulse width modulation (pwm) converters have poor efficiencies at light loads, while pulse frequency modulation (pfm) control is more efficient for the same cases. switching losses constitute a major portion of the total power loss at light loads. to decrease the switching losses...

Primary variable switching appears as a promising numerical technique for variably saturated ̄ows. While the standard pressurebased form of the Richards equation can su€er from poor mass balance accuracy, the mixed form with its improved conservative properties can possess convergence diculties for dry initial conditions. On the other hand, variable switching can overcome most of the stated nu...