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Data Replication in Data Intensive Scientific Applications with Performance Guarantee

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Data replication has been well adopted in data intensive scientific applications to reduce data file transfer time and bandwidth consumption. However, the problem of data replication in Data Grids, an enabling technology for data intensive applications, has proven to be NP-hard and even non approximable, making this problem difficult to solve. Meanwhile, most of the […]

A Venture Perspective on Cloud Computing

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As a result of the impact of the Web, cloud computing, and mobility, technology companies must radically rethink how they build, package, deploy, market, and sell their solutions. Cloud and mobile computing appear to represent yet another software architecture change. These platform shifts have happened almost every decade and take some time to standardize. Recognizing […]

Supply Chain as a Service: A Cloud Perspective on Supply Chain Systems

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Supply chains are characterized by multiple firms providing their resources and processes to meeting customer demand in an efficient manner. There exists a great variety of approaches for solving the inherent coordination problem. It has been acknowledged that the autonomy of supply chain participants – and their business objectives – as well as the contractual […]

An Optimum Land Cover Mapping Algorithm in the Presence of Shadows

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Occurrence of shadowy pixels in remote sensing images is a common phenomenon particularly with passive sensors. In these cases, analysts may mistakenly treat these pixels as a separate land cover class. This may result in the loss of information present in the shadow pixels A better approach may be to correct light intensity values in […]

A new chaos-based cryptosystem for secure transmitted images

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This paper presents a novel and robust chaos-based cryptosystem for secure transmitted images and four other versions. In the proposed block encryption/decryption algorithm, a 2D chaotic map is used to shuffle the image pixel positions. Then, substitution (confusion) and permutation (diffusion) operations on every block, with multiple rounds, are combined using two perturbed chaotic PWLCM […]

PSF Estimation via Gradient Domain Correlation

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This paper proposes an efficient method to estimate the point spread function (PSF) of a blurred image using image gradients spatial correlation. A patch-based image degradation model is proposed for estimating the sample covariance matrix of the gradient domain natural image. Based on the fact that the gradients of clean natural images are approximately uncorrelated […]

Cooperative Channelization in Wireless Networks with Network Coding

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we address congestion of multicast traffic in multihop wireless networks through a combination of network coding and resource reservation. Network coding reduces the number of transmissions required in multicast flows, thus allowing a network to approach its multicast capacity. In addition, it efficiently repairs errors in multicast flows by combining packets lost at different destinations. […]

load shedding in mobile systems with mobiqual

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In location-based, mobile continual query (CQ) systems, two key measures of quality-of-service (QoS) are: freshness and accuracy. To achieve freshness, the CQ server must perform frequent query reevaluations. To attain accuracy, the CQ server must receive and process frequent position updates from the mobile nodes. However, it is often difficult to obtain fresh and accurate […]

Localization of Mobile Nodes in Wireless Networks with Correlated in Time Measurement Noise

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Wireless sensor networks are an inherent part of decision making, object tracking, and location awareness systems. This work is focused on simultaneous localization of mobile nodes based on received signal strength indicators (RSSIs) with correlated in time measurement noises. Two approaches to deal with the correlated measurement noises are proposed in the framework of auxiliary […]

An Optimal Algorithm for Relay Node Assignment in Cooperative Ad Hoc Networks

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Recently, cooperative communications, in the form of having each node equipped with a single antenna and exploit spatial diversity via some relay node’s antenna, is shown to be a promising approach to increase data rates in wireless networks. Under this communication paradigm, the choice of a relay node (among a set of available relay nodes) […]