Fay is a flexible platform for the efficient collection, processing, and analysis of software execution traces. Fay provides dynamic tracing through use of runtime instrumentation and distributed aggregation within machines and across clusters. At the lowest level, Fay can be safely extended with new tracing primitives, including even untrusted, fully-optimized machine code, and Fay can be appl...

BACKGROUND The detailed analysis of an outbreak database has been undertaken to examine the role of contact tracing in controlling an outbreak of possible avian influenza in humans. The outbreak, initiating from the purchase of infected domestic poultry, occurred in North Wales during May and June 2007. During this outbreak, extensive contact tracing was carried out. Following contact tracing, ...

A data warehousing system collects data from multiple distributed sources and stores the inte grated information as materialized views in a local data warehouse Users then perform data analysis and mining on the warehouse views Figure shows the basic architecture of a data warehousing system In many cases the warehouse view contents alone are not su cient for in depth analysis It is often usefu...

For many decades, ray tracing is known and well used for rendering highly realistic images. Since ray tracing simulates the physical transport of light even highly complex optical properties and illumination conditions can be rendered correctly. Due to these features ray tracing is used e.g. for commercials and movies, in architecture, and for visualizations of industrial prototypes. Especially...

Traitor tracing schemes are a very useful tool for preventing piracy in digital content distribution systems. A traitor tracing procedure allows the system-manager to reveal the identities of the subscribers that were implicated in the construction of a pirate-device that illegally receives the digital content (called traitors). In an important variant called “asymmetric” traitor tracing, the s...

Distribution ray tracing uses Monte Carlo integration to solve the rendering equation. This technique was introduced by Cook et. al, and was notable because of its simplicity and its ability to simulate areal luminaires, camera lens e ects, motion blur, and imperfect specular re ection[5]. Distribution ray tracing has been extended and modi ed by many researchers, most notably by Kajiya who add...

Ray tracing is one of the important elements in photo-realistic image synthesis. Since ray tracing is computationally expensive, a large body of research has been devoted to improve the performance of ray tracing. One of the recent developments on efficient ray tracing is the implementation on graphics hardware. Similar to general purpose CPUs, recent graphics hardware can perform various kinds...

In computer graphics, ray tracing has become a powerful tool for generating realistically looking images. Even though ray tracing offers high flexibility, a logarithmic scalability in scene complexity, and is known to be efficiently parallelizable, its demand for compute power has in the past lead to its limitation to high-quality off-line rendering. This thesis focuses on the question of how r...

Traditional sketching aids rely on the physical production of templates or stencil which can be limiting and time consuming, particularly in the case of larger formats. One possible solution is 2D virtual tracing using a virtual template to create a physical sketch. This paper evaluates a mobile phone as a 2D virtual tracing tool and compares it with traditional sketching aids such as templates...

OBJECTIVES To undertake a critical literature review of published evidence on the effectiveness of contact tracing in sexually transmitted infections, mechanisms of referral, and the criteria for initiating this activity. To describe how these factors vary by causative agent and to characterize the current state of contact tracing in sexually transmitted infections in developed countries. MET...