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As the underlying core infrastructure and important component of cloud computing, distributed storage system is the foundation of all kinds of cloud services. While its replica mechanism enhanced the reliability and performance of system, the extra block replicas consume more disk space and maintenance cost significantly increased too. In this paper, we propose a novel QoS-aware Dynamic Data Replicas...
A novel method for head detection was proposed in video sequences captured with fixed vertical mono-camera, which integrated hough transformation, hair-color distribution model and circle existence model. Target area was firstly detected using fast gradient hough transformation (FGHT). In order to overcome head area mis-detection and incapability of locating head area introduced by FGHT, hair-color...
A trend in up-to-date developments in service computing focuses on the theme of dynamic composition and optimization of services and its application in service-oriented networked manufacturing (SONM). The paper addresses the particularities of manufacturing resource service composition and optimization (MRSCO) in SONM and proposes a conceptual framework. In this framework, cyber-physical systems (CPS)...
To enhance formal analysis, activity diagrams annotated with MARTE stereotypes are mapped into timed colored Petri nets with inhibitor arcs (TCPNIA). The mapping rules for the elements of activity diagrams and MARTE stereotypes are proposed respectively. The rules to map pin nodes and object flows to Petri nets are presented. These nodes can improve activity diagrams' modeling abilities for complicated...
In order to identify the traffic state of urban road network accurately, the traffic state identification methods based on cloud computing model are proposed. The macroscopic and microscopic characteristics of urban road network traffic flow are discussed in detail; and then the identification index systems are proposed. The traffic state identification models are proposed based on cloud computing...
Given n signatures on n distinct messages from n distinct users, aggregate signature scheme is possible to aggregate all these signature into a single short signature. In this paper, we propose an identity-based aggregate signature scheme which requires constant pairing operations in the verification. We prove that the proposed signature scheme is secure against existential forgery under adaptively...
Reputation is a key factor to enhance reliability and performance of transactions in the network. Many works have focused on rating the reputation of the entities through kinds of technologies. The entities send the request messages about reputation to other entities when they need the reputation of the target entities. Considering the nodes population is highly transient in open network, and the...
An improved generalized gradient vector force for active contour model, named IGGVF is presented in this paper. For the diffusion of GGVF force field virtually depends on Laplace operation and it can be decomposed in the tangent and normal directions and the diffusion in the normal direction plays the major role while the tangent direction has little effect. So the tangent component can be thrown...
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