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High dynamic range (HDR) image is becoming prevalent for its superiority in recording details of the real-world scene. A conventional exposure fusion method can be utilized to generate a HDR image from a set of differently exposed low dynamic range (LDR) images according to their weight maps. However, this method causes ghosts in the HDR image if there are moving objects or the background changes...
In cognitive radio networks, the available spectrum holes are usually discontinuous. Hence, it is hard to exploit these spectrum holes because the bandwidth of an individual one may not be able to satisfy the wide bandwidth requirement imposed by secondary users (SUs). Spectrum aggregation (SA) enables SUs to integrate several spectrum holes into one channel with wide bandwidth which may support high...
In the real world, companies would publish social networks to a third party, e.g., a cloud service provider, for marketing reasons. Preserving privacy when publishing social network data becomes an important issue. In this paper, we identify a novel type of privacy attack, termed 1∗-neighborhood attack. We assume that an attacker has knowledge about the degrees of a target's one-hop neighbors, in...
Cloud computing has emerged as a new type of commercial paradigm. As a typical cloud service, each file stored in the cloud is described with several keywords. By querying the cloud with certain keywords, a user can retrieve files whose keywords match his query. An organization that has thousands of users querying the cloud can set multiple proxy servers inside itself to reduce the querying cost....
To solve the signal control problems created by the mutual interference between motor traffic and pedestrians in cities, the signal control model with pedestrians non-complying is proposed based on the traditional signal optimization model. A particle swarm algorithm is proposed to solve the signal control problem. Based on an intersection of Tianhe district in Guangzhou City, the model is calculated...
This research came from a school-enterprise cooperation program, which intends to improve the quality of software testing process in SAP IDDC team. In data collection stage, it was found that one of six measurements, number of test case executions, had 77% data missing in monotone due to the newly adopted test case tracking tool. Three common imputation approaches, Multiple Imputation (MI), Expectation...
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