We present a technique for lossy image compression based on the joint-adaptive space and frequency decomposition of images. The algorithm adapts to image content by both developing wavelet packet bases for separate areas of the image and by segmenting image subbands as needed. The elements of the expansion are a two-channel lter bank and a complete and disjoint binary segmentation system. We co...

In most algorithms involving elliptic curves, the most expensive part consists in computing multiples of points. This paper investigates how to extend the τ -adic expansion from Koblitz curves to a larger class of curves defined over a prime field having an efficiently-computable endomorphism φ in order to perform an efficient point multiplication with efficiency similar to Solinas’ approach pr...

We present a technique for lossy image compression based on the joint-adaptive space and frequency decomposition of images. The algorithm adapts to image content by both developing wavelet packet bases for separate areas of the image and by segmenting image subbands as needed. The elements of the expansion are a two-channel lter bank and a complete and disjoint binary segmentation system. We co...

This paper describes error compensation methods for parallel kinematics machines (PKMs). First, joint errors and link deformations caused by external forces and heat are discussed. Because a linear scale unit is connected to each spherical joint located at both ends of an extensible limb through two rods, the scale unit can measure not only displacement of the prismatic joint but also the limb’...

Received: September 2001 Revised: June 2002 Accepted: August 2002 Online publication date: 20 March 2003 Abstract The evolution of foreign entry in the form of joint ventures and wholly owned manufacturing operations is examined as a staged process shaped by experience and imitation dynamics at the firm, group, and industry levels of analysis. The expansion of South Korean firms into China betw...

This paper is concerned with nonlinear inverse problems where data and solution are vector valued and, moreover, where the solution is assumed to have a sparse expansion with respect to a preassigned frame. We especially focus on such problems where the different components of the solution exhibit a common or so–called joint sparsity pattern. Joint sparsity means here that the measure (typicall...

The local thermal behavior of the Ag(2)O framework structure has been studied by extended x-ray absorption fine structure. The average Ag-O nearest-neighbor distance expands upon heating, while the Ag-Ag next-nearest-neighbor distance contracts. An original implementation of the cumulant analysis shows that the Ag-O expansion is a joint effect of potential anharmonicity and geometrical deformat...