Introduction: Studies of object perception are hampered by the difficulty of mathematically describing the similarity of realistic images. Recently, color based metrics have been developed to search for similar images in large databases of realistic images. Such metrics have been shown to predict human subjects’ similarity rankings of realistic images, because the color of realistic images ofte...

In this paper, we study the opinion dynamics of Improved Deffuant model (IDM), where the convergence parameter μ is a function of the opposite’s degree K according to the celebrity effect, in smallworld network (SWN) and scale-free network (SFN). Generically, the system undergoes a phase transition from the plurality state to the polarization state and to the consensus state as the confidence p...

Consider a time-harmonic electromagnetic plane wave incident on a medium enclosed by a bounded domain in R. In this paper, well-posedness of the variational problem for the direct scattering is examined. An energy estimate for the scattered field is obtained on which the Born approximation is based. A regularized recursive linearization method for the inverse medium scattering, which reconstruc...

CURRENT SCIENCE, VOL. 93, NO. 10, 25 NOVEMBER 2007 1422 *For correspondence. (e-mail: [email protected]) vertical measurements. Also, the time taken by the different stochastic methods is compared. The longer data spans give reliable results as well as less standard deviation for residuals. Using the single-frequency receiver, the standard deviation of the residuals is the same for all three sto...

Macrodiversity is used to provide better coverage in wireless communications. Two examples are single frequency networks (SFN) and soft handoff. We show that an OFDM system utilizing macrodiversity is very sensible to poor synchronization among transmitters and to Doppler shifts, and that serious performance degradation results from such effects. We provide a solution, based on inter-carrier in...

We present a cw single-frequency laser source with what is to our knowledge the largest emission range ever demonstrated, from the green to the mid-IR range. It employs a cw optical parametric oscillator with subsequent resonant frequency doubling. Typical output powers are 30–500 mW, with 160 mW at 580 nm. Modehop-free oscillation, high absolute frequency stability, 20-kHz-signal linewidth, an...

A novel and compact diode-pumped Er-Yb:glass laser, with single-frequency output power up to 20 mW in a wavelength range from 1531 nm to 1547 nm, was frequency stabilized with respect to sub-Doppler rovibrational transitions of C2H2. The laser frequency was locked to these molecular lines by means of the non-linear wavelengthmodulation spectroscopy technique. The relative frequency stability of...

Cognitive decline diseases, such as dementia, could be prevented through Cognitive Stimulation (CS). The integration of the members of the elder‟s social family network (SFN) in CS sessions can encourage the elder to perform CS activities. We designed InTouchFun, a pervasive CS collaborative system which eases interaction through natural interfaces and enables SFN members to interact with elder...

This work is a study of the extension of an inverse obstacle scattering algorithm for fixed, single-frequency data to multi-frequency time-dependent settings. The inversion algorithm is based on the point source method, which reconstructs scattered fields pointwise with respect to frequency. We use Fourier transforms to obtain the time-dependent scattered fields as superpositions of single-freq...

Samples of water inside and outside an exclusion zone (EZ), created by Nafion swollen in water, were irradiated at the wavelength λ = 1264 nm, which stimulates the electronic transition of dissolved oxygen from the triplet state to the excited singlet state. This irradiation induces, after a long latent period, chemiluminescence self-oscillations in the visible and near UV spectral range, which...