Two-phase sampling is often used in a wide variety of surveys. Variance estimation from a two-phase sample has been a subject of active research. The re-sampling method of variance estimation has been used for this problem. However, the method confronts a challenging problem when the first phase sampling fraction is high. In the extreme (but not uncommon) case some first-phase strata are take-a...

A method to implement digital audio watermarking in the frequency domain is presented. The embedding is performed by using chaos based sequences to increase the signature hiding properties. The proposed scheme takes into account the MPEG psychoacoustic model I to improve the robustness against the MP3 compression. Some tests have been performed to verify the system robustness against the MP3 co...

During May 2003 the Department of Energy’s Atmospheric Radiation Measurement Program conducted an Intensive Operations Period (IOP) to measure the radiative effects of aerosol and clouds. A suite of both in situ and remote sensing measurements were available to measure aerosol and cloud parameters. This paper has three main goals: First, it focuses on comparison between in situ retrievals of th...

A composite random sampling design was used to estimate the concentrations of hydrocarbons in sediments from two near-shore areas of Scotland (Firth of Clyde and Firth of Forth). The aim of this work was to estimate a mean value for each parameter in these areas, and to determine whether this can be done with more thorough coverage (better representation), better precision and less variance at ...

Some databases are simply large (e.g., with ter_abytes of data). A number of potential and diverse patterns in databases would sufficiently be mined so as to support various decisions in applications. This research advocates a re-recognition and re-cogitation to how to discover very large databases. It also presents a new technique mining very large databases will be developed on different hier...

The present study aspired to scrutinize the relationship among EFL learners' Self-directed Learning (SL), Resilience (RE), and Willingness to Communicate (WTC). To accomplish this purpose, 124 male and female undergraduate EFL learners, within the age range of 20 to 32, were selected through convenience sampling. These EFL learners were asked to fill in three questionnaires, namely the SL...

Chang'e-5 (CE-5) mission was successful to return samples up 1.8 kg from the northeastern part of Rumker region, Moon. These can provide new understandings for basaltic volcanism northern Oceanus Procellarum. Therefore, terrain-related analysis region will become a hotspot in recent and latter studies. As typical surface analyzing method, multiscale roughness has been used planetary studies lon...

In this paper, a sampling-based trajectory planning algorithm for laboratory-scale 3D gantry crane in an environment with static obstacles and subject to bounds on the velocity acceleration of system is presented. The focus developing fast motion differentially flat systems, where intermediate results can be stored reused further tasks, such as replanning. proposed approach based informed optim...