We present an online occlusion culling system which computes visibility in parallel to the rendering pipeline. We show how to use point visibility algorithms to quickly calculate a tight potentially visible set (PVS ) which is valid for several frames, by shrinking the occluders used in visibility calculations by an adequate amount. These visibility calculations can be performed on a visibility...

A component of the Atmospheric Infrared Sounder (AIRS) instrument system is the AIRS/Visible Near InfraRed (Vis/NIR) instrument. With a nadir ground resolution of 2.28 km and four channels, the Vis/NIR instrument provides diagnostic support to the infrared retrievals from the AIRS instrument and several research products, including surface solar flux studies. The AIRS Vis/NIR is composed of thr...

Most of the irrigated agricultural regions in Europe are supplied by surface irrigation networks managed by local water authorities (WAs). Under such conditions, WAs are not able to fully monitor water usage and farmers have an information advantage vis-a-vis the WA. This results in the water authority suffering ‘pricing failure’ if it decides to apply an incentive pricing strategy (tariffs pro...

We consider the problem of checking whether an incomplete design can still be extended to a complete design satisfying a given CTL formula and whether the property is satisfied for all possible extensions. Motivated by the fact that well-known model checkers like SMV or VIS produce incorrect results when handling unknowns by using the programs’ non-deterministic signals, we present a series of ...

The semantics of a proof language relies on the representation of the state of a proof after a logical rule has been applied. This information, which is usually meaningless from a logical point of view, is fundamental to describe the control mechanism of the proof search provided by the language. In this paper, we present a monadic datatype to represent the state information of a proof and we i...

For years, the mutual exclusion algorithm of Lycklama and Hadzilacos (1991) was the optimal mutual exclusion algorithm with the first-comefirst-served property, with a minimal number of (non-atomic) communication variables (5 bits per thread). Recently, Aravind published an improvement of it, which uses 4 bits per threads and has simplified waiting conditions. This algorithm is extended here wi...

The virtual colonoscopy technique is a non-invasive technique used to generate high resolution video views of the colon interior structure. The colonic structure consists of a great number of triangle meshes that challenge rendering performance. In contrast to previous work, the proposed approaches allow interactive colonic surface rendering on low-cost PC systems. Our system takes advantage of...

This new edition of a well-known book has been thoroughly revised and brought up-to-date in accordance with the rapid advances made in this department of medicine during the Great War. The book in its present form is divided into five sections, vis., thermotherapy, hydrotherapy, massotherapy (including medical gymnastics), the rest cure, electrotherapeutics, and dieto-therapy. A new chapter has...

A specification language used in the context of an effective theorem prover can provide novel features that enhance precision and expressiveness. In particular, typechecking for the language can exploit the services of the theorem prover. We describe a feature called “predicate subtyping” that uses this capability and illustrate its utility as mechanized in PVS. Keywords—Formal methods, specifi...

Aerosol retrieval from SCIAMACHY data processing at ISAC-CNR has been carried-out to retrieve Aerosol Optical Depth (AOD) at 500 nm wavelength together with a parameter (class) which defines a set of chemico-physical properties pertaining to suspended particles. SCIAMACHY Level 1B data from nadir measurements both over ocean and land are used as input for this processor. SCIAMACHY, onboard ENVI...