In previous techniques of bit rate reduction transcoding, reusing the mode of the input MB is widely adopted. However, directly re-using the mode of input MB will cause additional losses for H.264 bit-rate scaling. Variable-size block-matching based motion estimation makes H.264 much more efficient than other coding standards while increasing its complexity. As the target bit rate changes, the ...

In this paper, we study matching integral graphs of small order. A graph is called matching integral if the zeros of its matching polynomial are all integers. Matching integral graphs were first studied by Akbari, Khalashi, etc. They characterized all traceable graphs which are matching integral. They studied matching integral regular graphs. Furthermore, it has been shown that there is no matc...

In H.264, B frame bi-directional predictions and its DIRECT mode coding are included to enhance video compression efficiency. However, such tools are complex and result in a long computation time. This paper proposes a fast DIRECT mode prediction algorithm that enables to save B frame encoding time significantly by determining DIRECT mode (DM) at an early stage through optimal mode pattern matc...

The purpose of this article is to show that efficient light coupling in lithium niobate waveguides presenting a strongly confined mode, such as photonic wires, is possible with the use of a periodically segmented waveguide coupler. The coupler consists in an input periodically segmented waveguide whose mode size is adapted to the mode of a standard single-mode fiber coupled to a photonic wire w...

Contradirectional propagation through active, first-order, almost-periodic, corrugated waveguide gratings is analyzed by using both coupled-mode theory and a combined effective-index/impedance-matching matrix technique. For TE-mode operation, which is near the first-order Bragg wavelength, the equivalence of the two techniques is analytically demonstrated for shallow surface corrugations.

schema matching is a critical step in many applications, such as data warehouse loading, online analytical process (olap), data mining, semantic web [2] and schema integration. this task is defined for finding the semantic correspondences between elements of two schemas. recently, schema matching has found considerable interest in both research and practice. in this paper, we present a new impr...

Several designs for linear colliders for e+e-collisions in the TeV range are currently under discussion. Most of them will use multi bunch operation. Therefore the study of higher order modes excited by previous bunches in the train becomes even more important for the optimal design of the accelerator components. Many of the designs use long tapered disc-loaded waveguides for acceleration. Nume...

Abstract: For mode fields of integrated optical waveguides with piecewise constant and rectangular permittivity profile, Maxwell’s equations reduce to the twodimensional Helmholtz wave equation, supplemented by continuity requirements on the boundaries between different media. Two basic components of the mode field are expanded into factorizing harmonic or exponential functions, separately on e...