We present a piggyback server invalidation (PSI) mechanism for maintaining stronger cache coherency in Web proxy caches while reducing overall costs. The basic idea is for servers to piggyback on a reply to a proxy client, the list of resources that have changed since the last access by the client. The proxy client invalidates cached entries on the list and can extend the lifetime of entries no...

We present and evaluate adaptive, hybrid cache coherence protocols for bus-based, shared-memory multiprocessors. Such protocols are motivated by the observation that sharing patterns vary substantially between di erent programs and even cache blocks within the same program. Performance measurements across a range of parallel applications indicate that the adaptive protocols we present perform w...

In Electronic Commerce applications such as stock trading, there is a need to consult sources available on the web for informed decision making. Because information such as stock prices keep changing, the web sources must be queried continually to maintain temporal coherency of the collected data, thereby avoiding decisions based on stale information. However, because network infrastructure has...

User’s intentions may be expressed through spontaneous gesturing, which have been seen only a few times or never before. Recognizing such gestures involves one shot gesture learning. While most research has focused on the recognition of the gestures itself, recently new approaches were proposed to deal with gesture perception and production as part of the same problem. The framework presented i...

Understanding of the nitrogen (N) cycle and its spatial variability is important for managing ecosystems. Soil δ15N, as an important indicator of different soil nitrogen cycling processes, may provide critical information about the spatial variability in soil N cycling. The objective of this study was to examine the dominant landscape scale variability of δ15N, the location of the variability a...

In this work, the authors present observations of enhanced temporal coherency beyond that expected using the observations of the standard deviation of the Doppler velocities and the assumption of a family of exponentially decaying autocorrelation functions. The purpose of this paper is to interpret these observations by developing the complex amplitude autocorrelation function when both incoher...

OBJECTIVE The main obstacle in interpreting EEG/MEG data in terms of brain connectivity is the fact that because of volume conduction, the activity of a single brain source can be observed in many channels. Here, we present an approach which is insensitive to false connectivity arising from volume conduction. METHODS We show that the (complex) coherency of non-interacting sources is necessari...

Cyber-Physical Systems are complex systems made of various and heterogeneous subsystems; they have different aspects and each aspect has its own requirements and properties to be satisfied. ModelDriven Engineering (MDE) is a promising approach used to design and analyze complex systems on different levels and diverse views. CPS designers take many factors into account due to the complexity and ...

In this work, the question of the coherency matrix propagation of a light beam is addressed by means of the analysis of interpolation processes between two physical situations. These physical situations are defined according to the second order statistical properties of the underlying process. Two states of a light beam or the path in a medium to go from a physical situation at distance z(1) to...

A Fourier series non-stationary coherency model with respect to the site conditions for horizontal component was developed. The evolution of achieved using parameters related site, inter-station distance, and time. First, based on simulation a ground-motion field considering wave-passage effect site-response effect, approach used estimation wavelet transform is presented. Subsequently, formulat...