Ensuring fast and accurate failure detection is a fundamental issue for building efficient fault-tolerant distributed systems. In an effort to make fault-tolerant applications easier to implement, we are trying to provide failure detection as a generic Internet service, similar to what was done very successfully with NTP (network time protocol) for clock synchronization. To do so, we must revis...

This paper presents a new data representation known as Dual FiXedpoint (DFX), which employs a single bit exponent to select two different fixedpoint scalings. DFX provides a compromise between conventional fixed-point and floating-point representations. It has the implementation complexity similar to that of a fixed-point system together with the improved dynamic range offered by a floating-poi...

The paper presents the integration of a geometric model of fisheye lenses and a geometric terrestrial laser scanner model in a bundle block adjustment. The model allows for a full integration of hemi-spherical fisheye imagery into terrestrial laserscanner data processing schemes. Both the laserscanner and fisheye geometric model are extended by additional parameters to compensate for deviations...

Global maps of carbon dioxide (CO2) mole fraction (in units of parts per million) in the lower atmosphere are important tools for climate research since they can help identify sources and sinks of CO2. No satellite instrument currently provides estimates of the lower-atmosphere CO2, though inferences are possible using data from existing instruments. Two remote sensing instruments, the Orbiting...

1. Introduction As the types of defects that are causing small leakage currents are more and more difficult to find with decreasing feature size, more advanced analysis strategies have to be developed to meet reliability demands. A method based on a delta Iddq test has been developed to sort out parts with potential reliability issues. Those parts are fully functional, but show small Iddq varia...

In this article we study a class of semiparametric transformation models with random effects for the intensity function of the counting process. These models provide considerable flexibility in formulating the effects of possibly time-dependent covariates on the developments of recurrent events while accounting for the dependence of the recurrent event times within the same subject. We show tha...