This article deals with optimal transmission switching (OTS) problems involving binary decisions about network topology and nonconvex power flow constraints. We adopt a semidefinite programming formulation for the (OPF) problem that, however, remains due to presence of discrete variables bilinear products between decision variables. To tackle latter, we introduce physically inspired, virtual-vo...

This paper focuses on the issue of network connectedness (NC) in security-constrained optimal transmission switching problems, which is complicated by branch contingencies and corrective line switching. Two criteria are firstly proposed with principle preserving NC as much possible within reasonable limits. By extending electrical flow based constraints, a proposition derived to associate diffe...

Studies of the capacity of cellular systems, stated in terms of the admissible number of remote users, have generally been limited to voice telephony. In this paper, we address the problem of comparing the interference-limited performance of CDMA and TDMA systems in a packet switched environment. The objective is to determine whether the capacity advantages claimed for circuit-switched CDMA sti...

In OBS, edge routers aggregate traffic into variable length bursts that are sent unslotted. This limits the amount of processing in the core routers. Header and data are seperated in time, by Toffset. This allows the switch to be correctly configured by the time the data arrives. The data burst can then pass through transparently. Since OBS is bufferless, Toffset decreases by δ in every node. C...

The burst contention problem in Optical Burst Switching network is an intrinsically serious problem. Many researches have tried to solve this problem, however it have been known that avoiding the burst loss is very difficult issues in the current OBS network. To improve burst blocking rate, we consider the edge/core combined OBS network where the core node performs the edge node function as wel...

The main issue in the optical transmission is switching speed. The optical packet switching faces many significant challenges in processing and buffering. The generalized multilevel protocol switching seeks to eliminate the asynchronous transfer mode and synchronous optical network layer, hence the implementation of IP over WDM (wave length division multiplexing). Optical burst switching attemp...

Optical burst switching (OBS) technology is a promising solution for reducing the gap between transmission and switching speeds in future networks. This paper addresses the burst contention resolving mechanism and problem of routing optimization in optical burst switching (OBS) networks. Here, we will discuss the various contentions resolving techniques and focus on one main technique, known as...

We address the problem of estimating the average switching activity of combinational circuits under random input sequences. Switching activity is strongly affected by gate delays, and for this reason we use a variable delay model in estimating switching activity. Unlike most probabilistic methods that estimate switching activity, our method takes into account correlation caused at internal gate...

A study of the optical transmission of low-loss W1.5 photonic crystal waveguides built on silicon membranes and operating at telecom wavelengths is presented. The feasibility of performing all-optical switching is demonstrated for W1.5 waveguides coupled with L3 cavities, systems amenable for incorporation in on-chip devices. Switching of waveguide transmission is achieved by means of optical e...