Current research into resource discovery in peer-topeer networks is largely focussed on the use of Distributed Hash Tables and multi-layered topologies. In this paper we present a resource discovery system capable of resolving keyword-value pair queries, based on a two-layered Chord ring architecture. We show how the base topology augmented with shortcuts between layers and selection of ring me...

In order to reduce network traffic in distributed virtual environment, combined LOD techniques with active interest management based on layered interest management, a layered filtering method based on multi-resolution geometric model is proposed in this paper. This method constructs multi-resolution geometric model using dynamic model simplification algorithm, then creates the mapping from matc...

Existing approaches to combined performance and availability modelling of multi-layered service systems do not consider the delays associated with the detection of failure (repair) and subsequent reconfiguration. The detection delay influences the runtime overhead while both of them together affects the system downtime. The effect of these two types of delays should therefore be considered for ...

Emotional understanding and expression is a fundamental basis for human-computer interaction, and how to read the human mind through facial expression recognition technology has become a hot issue. Large dimension of image data, sample calibration difficulties, and small size training sample set make the efficient facial expression recognition task difficult. DBN (Deep Belief Network) achieves ...

Distributed multimedia applications require a variety of levels of quality of service (QoS) from communication networks and end-systems which realize the multimedia interface with the human users or provide remotely accessed multimedia information. The management of these services has to take into account the available resources and the user's wishes concerning the desired quality and costs. Ba...

This paper surveys the current state of the object-oriented paradigm as it applies to the handling of geo-referenced information. The model of any computerized system is multi-layered, with a high-level system-independent conceptual model of the application domain supported by increasingly system-oriented models beneath. The author argues that object-oriented approaches can be taken at each of ...

Abstract Background and purpose:In many regions especially in the north of Iran groundwater is the most important resource for drinking supply. A present study was carried out in the Tajan plain in northern Iran. The aim of this study was to evaluate the quality of groundwater. Materials and Methods:In order to constructing the groundwater quality index (GWQI) 3 main levels were composed select...

Protection of ground water for present and future use requires monitoring and understanding of the mechanisms controlling long-term quality of ground water. In this study, spatial and temporal trends in concentrations of nitrate and pesticides in ground water in the eastern San Joaquin Valley, California, were evaluated to determine the long-term effects of agricultural and urban development on...

The Tamarack State Wildlife Area in eastern Colorado is being investigated as a possible managed recharge project to redirect flows in the South Platte River for water quantity management. Two primary surface water/groundwater interactions exist at Tamarack: (1) between the South Platte River and alluvial aquifer and (2) between backwater sloughs, or secondary river channels, and the alluvial a...

Pathogenic bacteria use interconnected multi-layered regulatory networks, such as quorum sensing (QS) networks to sense and respond to environmental cues and external and internal bacterial cell signals, and thereby adapt to and exploit target hosts. Despite the many advances that have been made in understanding QS regulation, little is known regarding how these inputs are integrated and proces...