It is proposed to obtain information on atmospheric refractivity structure by measuring the angle of arrival (AoA) radio signals routinely broadcast commercial aircraft. The would be measured at hill-top sites using a simple two-element interferometer. Knowledge aircraft’s location (information conveniently contained within broadcasts) and AoA will enable bending calculated. As measurable only ...

Because of the great volume of image resources produced and gathered on the web for public browsing, image retrieving tools and systems play an important role for users in retrieving image resources. A novel image retrieving system, the Image Semantic Search System (ISSS), was designed and implemented based on semantic web concepts and techniques. The paper illustrates the methodology for desig...

Retrieving multiple cases is supposed to be an adequate retrieval strategy for guiding planners like SNLP because of the recognized exibility of these planners to interleave steps in the plans. In this paper, however, we will present a domain in which retrieving multiple cases is contrapro-ductive. We analyze the characteristics of the domain and show that merging cases is diicult because the a...

There is a great interest on the reuse of learning materials. However, nowadays, they are structured as multimedia files and, therefore, retrieving a specific material means retrieving the whole file, even though it could be desirable to access and use only parts of these materials. So, this paper proposes an ontology based on the metadata standards LOM and MPEG-7 for LOs’ content description, ...

Recent results of ground-based telescopes, giving high-quality measurements the cosmic microwave background (CMB) temperature power spectrum on small scales (below 1 deg) motivate need for an accurate model foregrounds, which dominate primary signal at these multipoles. In a previous work, we have shown that cosmological information could be retrieved from thermal Sunyaev Zel’dovich (SZ) effect...