Solid Freeform Fabrication (SFF) processes have demonstrated the ability to produce parts with locally controlled composition. In the limit, processes such as 3D Printing can create parts with composition control on a length scale of 100 m. To exploit this potential, new methods to model, exchange, and process parts with local composition control need to be developed. An approach to modeling a ...

Automatic detection of vowel landmarks is useful in many applications such as automatic speech recognition (ASR), audio search, syllabification of speech and expressive speech processing. In this paper, acoustic features extracted around epochs are proposed for detection of vowel landmarks in continuous speech. These features are based on zero frequency filtering (ZFF) and single frequency filt...

This paper deals with the modeling and process planning of solid freeform fabrication (SFF) of 3D functionally graded materials (FGMs). A novel approach of representation and process planning of FGMs, termed as equal distance offset (EDO), is developed. In EDO, a neutral arbitrary 3D CAD model is adaptively sliced into a series of 2D layers. Within each layer, 2D material gradients are designed...

Solid freeform fabrication (SFF) is based on a part-centric process model: create a solid model of the part, form planar slices, and fabricate the part by producing all of the polyhedra by any of several methods. A class of applications is emerging which will pull SFF from the part-centric model to a new paradigm in which parts are seen as components of interactive networks. This is precisely t...

Functional testing of SFF parts represents an exciting area of research in solid freeform fabrication. One approach to functional testing is to use similitude techniques to correlate the behavior of an SFF model and a product. Previous research at UT Austin has resulted in development of an empirical similitude technique to correlate the behavior of parts of dissimilar materials and geometry. A...

The prescribed performance robust control method for the leader/follower (L/F) formation is proposed in this paper to solve problem of spacecraft flying (SFF) full-process (FPC). objective FPC establish an ultra-close with constraint collision avoidance between two spacecraft, and then maintain configuration high-precision accuracy a period time. main contribution lies following three aspects. ...

Shape from Focus (SFF) is one of the passive techniques to recover shape an object under consideration. It utilizes focus cue present in stack images, obtained by a single camera. In SFF when images are acquired, inter-frame distance, also known as sampling step size, assumed be constant. However, practice, due mechanical constraints, size cannot remain The inconsistency causes problem jitter, ...

Many small form factor (SFF) optical pickup heads based on the swing arm design utilize a piezoelectric material or the slim metal plate to perform the focusing action. The seesaw-type actuator is a new mechanism used in the focusing action for SFF optical data storage devices. The swing arm nutates along a pivot instead of a hinge in the vertical movement. In this paper, an optimized design of...

Recent advances in sold freeform fabrication (SFF) present tremendous design freedom for a product design with complex geometries. In this paper, we consider the problem of using rigid materials to design flexible skin of a product component for SFF. A design strategy based on the combination of welldefined meso-structures is presented to achieve desired heterogeneous material properties, and c...

Shape-from-focus (SFF) has widely been studied in computer vision as a passive depth recovery and 3D reconstruction method. One of the main stages in SFF is the computation of the focus level for every pixel of an image by means of a focus measure operator. In this work, a methodology to compare the performance of different focus measure operators for shape-from-focus is presented and applied. ...