This paper presents a distributed mutual exclusion algorithm that generalizes several existing token-based algorithms for use in ad hoc wireless networks. The number of messages required to provide mutual exclusion is...
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Ensemble Kalman Filter (EnKF) uses a randomized ensemble of subsurface models for performance estimation. However, the complexity of geological models and the requirement of a large number of simulation runs make rout...
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ISBN:
(纸本)9780889867048
Ensemble Kalman Filter (EnKF) uses a randomized ensemble of subsurface models for performance estimation. However, the complexity of geological models and the requirement of a large number of simulation runs make routine applications extremely difficult due to expensive computation cost. Grid computing technologies provide a cost-efficient way to combine geographically distributedcomputing resources to solve large-scale data and computation intensive problems. We design and implement a grid-enabled EnKF solution to ill-posed model inversion problems for subsurface modeling. It has been integrated into the Res-Grid, a problem solving environment aimed at managing distributedcomputing resources and conducting subsurface-related modeling studies. Two use cases in reservoir studies indicate that the enhanced ResGrid efficiently performs EnKF inversions to obtain relatively accurate, uncertainty-ware predictions on reservoir production. This grid-enabled EnKF solution is also being applied for data assimilation of large-scale groundwater hydrology nonlinear models.
Nowadays, the disk storage's skyrocketing capacity has led to an amazing situation : grid-scale gathered storage of client nodes can overcome even the largest centralised storage units. Thus, one of the key challe...
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ISBN:
(纸本)9780889867048
Nowadays, the disk storage's skyrocketing capacity has led to an amazing situation : grid-scale gathered storage of client nodes can overcome even the largest centralised storage units. Thus, one of the key challenges related to the grid environment is to federate such spread storage resources together. Thereby, we have developed Vis-ageFS, a Posix compliant, wide-area file system. It is mainly built upon a storage virtualization layer, plug-ins aware coherency layer and a multi-tiered administration and monitoring service. However, once featured with a global namespace fuelled by heterogeneous storage, the wide-area job scheduler is willing to be aware of data location. Furthermore, depending on workload, it may be highly desirable to make use of local storage facilities without data staging penalties. In this paper, we present one dynamic storage feature intended to provide transparent local storage access while remaining within the VisageFS global namespace.
Topological changes in sensor networks may affect qualities of sensor coverage. In this paper, we present two suites of algorithms for dynamically maintaining the coverage and the measures of its qualities. Using only...
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Service-oriented architecture (SOA) is a popular industry standard that provides an elegant model to create and compose interoperable applications. In the case of sensor networks, SOA is considered to be a very attrac...
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ISBN:
(纸本)9780889866560
Service-oriented architecture (SOA) is a popular industry standard that provides an elegant model to create and compose interoperable applications. In the case of sensor networks, SOA is considered to be a very attractive enabler for sensor programmability and self-integration. However, SOA cannot be used without additional mechanisms to enhance the reliability and availability of the sensors behind the services. In the absence of such mechanisms, sensor-based SOA could provide a false promise of service whose, quality and availability are highly questionable and cannot be guaranteed. In this paper, we propose a Virtual Sensor framework for service-oriented sensor networks with the aim of enhancing reliability, prolonging availability and enabling automatic service composability. We classify and model three useful virtual sensor concepts and present compensation algorithms for coping with sensor failure. To quantify the merit of our approach, we developed a Data Quality Indicator measure for expressing the perceived quality of virtual sensor readings.
The paper investigates some important transport layer algorithms for wireless sensor networks. On the basis of the single-path-based distributed TCP caching, which work badly when some node on the path be down, adopt ...
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ISBN:
(纸本)0769529097
The paper investigates some important transport layer algorithms for wireless sensor networks. On the basis of the single-path-based distributed TCP caching, which work badly when some node on the path be down, adopt multi-path routing on the network layer and distributed TCP caching on the transport layer to enhance transport reliability. From the simulation results, it improves overall performance in term of end-to-end transport delay comparing with the original DTC algorithm and loads are distributed among the intermediate nodes. And then address some open issues as the research prospects.
The problem of scheduling multiple divisible loads on bus networks with unknown parameters is addressed in this paper Most research in optimal partitioning of massive loads to be distributed among processors in a dist...
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ISBN:
(纸本)9780769529431
The problem of scheduling multiple divisible loads on bus networks with unknown parameters is addressed in this paper Most research in optimal partitioning of massive loads to be distributed among processors in a distributed system is under the assumptions of known and deterministic network resources. Lately, researchers have started addressing issues that are application oriented and go beyond those simple assumptions of load distribution. In this paper a heterogeneous network with unknown network resources is considered, and several strategies with increasing refinements that minimize the total processing time of multiple divisible loads are designed. These strategies perform close to the real distributed systems more and more. Application comparison of these proposed strategies is carried out.
A distributed constraint optimization problem (DCOP) distributes the variables and constraints among intelligent agents to enable it to be treated as a constraint satisfaction problem. In this paper, we propose a sear...
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ISBN:
(纸本)9780889866560
A distributed constraint optimization problem (DCOP) distributes the variables and constraints among intelligent agents to enable it to be treated as a constraint satisfaction problem. In this paper, we propose a search method based on the asynchronous distributed optimization (Adopt) algorithm that has been proposed for DCOP. Adopt is a complete method based on a depth-first-search, and operates asynchronously to find the optimal solution for the overall cost. We propose a distributed search method that builds on the merits of Adopt by considering the local load of each agent as opposed to overall optimization. The effect of the proposal was evaluated in simulations.
Measuring knowledge assets of a company is difficult. Most existing approaches either fail to select the right indicators, to facilitate aggregation of indicators, to reveal correlations between indicators or to forec...
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ISBN:
(纸本)9780889866560
Measuring knowledge assets of a company is difficult. Most existing approaches either fail to select the right indicators, to facilitate aggregation of indicators, to reveal correlations between indicators or to forecast future indicator values. An approach to overcome these obstacles using Computational Intelligence (CI) is introduced. Different CI techniques are used to enhance two prominent knowledge assessment approaches, the Intellectual Capital Navigator and the Technology Balance.
The proceedings contain 51 papers. The topics discussed include: using an updating of DHCP in mobile ad-hoc networks;searching and detecting spatial LSB steganographic images on the Internet;development of parallel di...
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ISBN:
(纸本)0889865701
The proceedings contain 51 papers. The topics discussed include: using an updating of DHCP in mobile ad-hoc networks;searching and detecting spatial LSB steganographic images on the Internet;development of parallel direct sparse linear solvers within a parallel finite element code;checkpointing and rollback-recovery protocol integrated with VsSG protocol for RYW session guarantee;achieving realtime capabilities in Ethernet networks by edge-coloring of communication conflict-multigraphs;cross-layer designs for mitigating range attacks in ad hoc networks;grid load balancing using an echo system of intelligent ants;critical path routing (CPR) protocol for mobile ad hoc networks;ADPROC: an adaptive routing framework to provide QoS in wireless sensor networks;evaluating the use of Motes and Tinyos for a mobile sensor platform;and a comparison study of optical MIN networks with parallel planes.
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