Even experienced users of IR systems experience a high degree of frustration in searching for information on the World Wide Web, in part because current search engines concentrate on speed and coverage at the expense of precision. In this paper, we describe an approach to increase precision of retrieval based on ltering out irrelevant material. Potentially relevant matches got from a standard W...

When the Akebono (EXOS-D) satellite passed through the plasmasphere, a series of lightning whistlers was observed by its analog wideband receiver (WBA). Recently, we developed an intelligent algorithm to detect lightning whistlers from WBA data. In this study, we analyzed two typical events representing the clear dispersion characteristics of lightning whistlers along the trajectory of Akebono....

We developed a high-index-contrast photonic structure for improving the light extraction efficiency of light-emitting diodes (LEDs) by a self-assembly approach. In this approach, a two-dimensional grating can be non-lithographically integrated on the top of virtually any types of LEDs with controlled structural parameters and material indices. As a proof of concept, our designed photonic struct...

The fatigue fracture of structural details subjected to cyclic loads mostly occurs at a critical cross section with stress concentration. The welded joint is particularly dangerous location because of sinergetic harmful effects of stress concentration, tensile residual stresses, deffects, microstructural heterogeneity. Because of these reasons many methods for improving the fatigue resistance o...

Abstract. We perform a Why-Because Analysis (WBA) starting from the information in the Executive Summary of the U.S. DoD Aircraft Accident Investigation Board report on the shootdown of two U.S. Army Black Hawk transport helicopters by U.S.A.F. F-15 fighter aircraft over Northern Iraq on 14 April 1994, during Operation Provide Comfort. We compare with the effort of Snook to perform a similar an...

Sommario In questo lavoro viene proposto un agente intelligente denominato DL-WBA (Description Logic based Web Browsing Assistant Agent) per supportare un utente nelle sue attività di browsing sul Web. L’attività di ricerca di nuove sorgenti informative è basata sull’utilizzo di un profilo utente che registra gli interessi e le preferenze dell’utente. Ogniqualvolta l’utente effettua una query, ...