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Currently, IoT devices are becoming more and more popular, being deployed in different scenarios such as monitoring the power consumption of a house or the state of an outdoor parking spot. These networks tend to be densely populated by a huge amount of sensors that send really short messages. Given these characteristics, their main problem is the great variability and unpredictability of battery...
Specially designed wireless accelerometers units were used in a series of experiments at the snow chute operated by the SLF at Weissflühjoch (Switzerland) during 2008–2009 winter. The purpose of the experiment was to evaluate the best design and the performance of these innovative instruments to provide information on the internal dynamics of flowing snow. The wireless accelerometers were placed in...
Resource discovery mechanisms are key for distributed computing. Traditional approaches use dedicated servers to store information about the whole system and make all the scheduling decisions. Many mechanisms exist for decentralized environments, based on distributing the information in a certain way over a structured overlay network. This usually creates complex relationships between the distribution...
Economic models have shown their suitability to allocate resources efficiently, considering an unbalanced supply and demand. As the use of the Grid is extending, a numerous set of distributed resource allocation frameworks have been developed to attain efficient resource management while keeping the scalability of the Grid. However, those frameworks make use of either simple double auction mechanisms...
Wireless Sensor Networks (WSN) have been applied to gather data from a large number of scenarios. WSN provide the potential to collect data at spatial and temporal scales that are many times not feasible with past instrumentation. Although many applications have been already developed, little has been done using WSN as infrastructure for sports oriented commercial applications.This paper studies the...
Large scale systems such as the Grid need scalable and efficient resource allocation mechanisms to fulfil the requirements of its participants and applications while the whole system is regulated to work efficiently. Economics inspired models have shown to efficiently allocate resources and services, scaling up well as they are decentralized. However most of existing implementations rely on a single...
In this paper we present SR-1, a simulation-based heuristic algorithm for the capacitated vehicle routing oroblem (CVRP). Given a CVRP instance, SR-1 uses an initial ??good solution??, such as the one provided by the classical Clarke and Wright heuristic, in order to obtain observations for the variable ??distance between two consecutive nodes in a route??. These observations are then fitted by a...
Large scale systems such as the grid need scalable and efficient resource allocation mechanisms to fulfil the requirements of its participants and applications while the whole system is regulated to work efficiently. Economics inspired models have shown ability to handle efficiently the allocation of resources and services, scaling up well as they are decentralized. Our model considers the arbitration...
One of the most challenging problems in grid environments concerns the matchmaking between resource requests and offers. As it happens in the physical economy, grid economy must be supported by services that locate resources based not only on their characteristics, but also on market-related properties, offerspsila and requestspsila properties and constraints, as well as on declarative specifications...
Collaborative e-learning virtual communities use virtual learning environments provided by the university or tools that are available in Internet. Although this model has proven its feasibility, it has important limitations. A way to deal with them is by defining virtual organizations (VO) that gather the resources and interests of their members in a way that they can lend resources to or borrow them...
The paper presents a bidding specification language and support tools for grid-oriented open resource marketplaces. The structure of bids is based on trees that permit bidders to express their preferences for grid resources by means of logical operators. Additionally, our bidding specification reduces the complexity of existing bidding languages since it permits imprecise description of user's preferences...
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