This paper describes a hierarchical visibility technique that signiicantly accelerates terrain rendering. With this technique, large parts of the terrain that are hidden from the viewpoint are culled, thus avoiding the expense of uselessly sending them down the graphics pipeline (only to nd in the z{buuer step that they are hidden). The hierarchical visibility technique has been implemented in ...

We present optical characterization and laser results achieved with single-crystal fibers directly grown by the micro-pulling-down technique. We investigate the spectroscopic and optical quality of the fiber, and we present the first laser results. We achieved a cw laser power of 10 W at 1064 nm for an incident pump power of 60 W at 808 nm and 360 kW peak power for 12 ns pulses at 1 kHz in the ...

The Eclipse modelling framework provides a hierarchy of Java classes that represent the abstract syntax of BPEL4WS. Many analyses of a BPEL4WS program boil down to walking its abstract syntax tree. We review, refine and extend a technique, based on Java’s reflection mechanism, to walk such trees. We apply this technique to implement two non-trivial analyses of BPEL4WS programs.

Information technology plays vital role to enhance our knowledge and improve social life. Information presentation is as important as information itself, and interaction with these information enable one to understand these information quickly and easily. In this article, the information is explore up to one level granularity by introducing single level drill down interactive technique for desc...

On-line audio dilation is a technique that time stretches, or slows down the tempo of audio signals as they are generated. This paper presents an on-line dilation technique and our ongoing research to assess the effects of audio dilation on speech communication using an interactive DIAPIX problem solving task.

Objective To assess and compare dental caries experience and salivary S. mutans, S. sobrinus, and streptococci counts between groups of Down syndrome and non-Down syndrome children and adolescents. Material and Methods This study included a sample of 30 Down syndrome children and adolescents (G-DS) and 30 age- and sex-matched non-Down syndrome subjects (G-ND). Dental caries experience was est...

Power reductions in VLSI systems have become a critical metric for design evaluation. Although power reduction techniques can be applied at every level of design abstraction, most automated power reduction techniques apply to the lower levels of design abstraction. Previous works have shown that sizable power reductions can be achieved by shutting down a system’s sub-circuits when they are not ...

Top-down induction of decison trees (TDIDT) is a very popular machine learning technique. Up till now, it has mainly used for propositional learning, but seldomly for relational learning or inductive logic programming. The main contribution of this paper is the introduction of logic decision trees, which make it possible to use TDIDT in inductive logic programming. An implementation of this top...

OBJECTIVES/HYPOTHESIS To review which type of cholesteatoma surgery, canal wall up (CWU) or canal wall down (CWD), provides the lowest risk for residual and/or recurrent disease in adults with primary acquired cholesteatoma. DATA SOURCES PubMed, Embase, CINAHL, the Cochrane Library, Scopus and Web of Science. STUDY DESIGN We selected articles comparing CWU with CWD, reporting on disease rec...

This paper presents practical experiments on a harmonic rejection down-mixer, which offers up to 75 dB of harmonic rejection, without an RF filter. The down-mixer uses a two-stage approach; the first stage is an analog multi-path/multiphase harmonic rejection mixer followed by a second stage providing additional harmonic rejection based on blind adaptive interference canceling in the discrete-t...