Noise In Nonohmic Regimes Of Disordered Systems

We present here a short review of mainly experimental properties of noise as disordered systems are driven into non-ohmic regimes by applying voltages of few volts only. It is found that the noise does not simply follow the resistance in that the direction of change of noise could be opposite to that of resistance. It is discussed how this and other properties make the noise a complementary and incisive tool for studying complex systems, particularly its dynamic properties. Study of noise in non-ohmic regimes in physical systems is rather in a nascent stage. Some of the open issues are highlighted.Comment: 9 Pages, 7 figures. Reported in Unsolved Problems of Noise and Fluctuations: UPoN 2005, Gallipoli, Italy, June 6-10, 200

Understanding the Impact of Collaboration Software on Product Design and Development

Prior research suggests that supply chain collaboration has enabled companies to compete more efficiently in a global economy. We investigate a class of collaboration software for product design and development called collaborative product commerce (CPC). Drawing upon prior research in media richness theory and organizational science, we develop a theoretical framework to study the impact of CPC on product development. Based on data collected from 71 firms, we test our research hypotheses on the impact of CPC on product design quality, design cycle time and development cost. We find that CPC implementation is associated with greater collaboration among product design teams which, in turn, have a significant positive impact on product quality and a reduction in cycle time and product development cost. Further analyses reveals that CPC implementation is associated with substantial cost savings that can be attributed to improvements in product design quality, design turnaround time, greater design reuse, and lower product design documentation and rework costs

Stationary Regime of Random Resistor Networks Under Biased Percolation

The state of a 2-D random resistor network, resulting from the simultaneous evolutions of two competing biased percolations, is studied in a wide range of bias values. Monte Carlo simulations show that when the external current $I$ is below the threshold value for electrical breakdown, the network reaches a steady state with a nonlinear current-voltage characteristic. The properties of this nonlinear regime are investigated as a function of different model parameters. A scaling relation is found between $/_0$ and $I/I_0$, where $$ is the average resistance, $_0$ the linear regime resistance and $I_0$ the threshold value for the onset of nonlinearity. The scaling exponent is found to be independent of the model parameters. A similar scaling behavior is also found for the relative variance of resistance fluctuations. These results compare well with resistance measurements in composite materials performed in the Joule regime up to breakdown.Comment: 9 pages, revtex, proceedings of the Merida Satellite Conference STATPHYS2