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Indoor localization remains a hot topic and receives tremendous research efforts during the last few decades. While most previous efforts focus on the designing issue, little effort has been paid to the impact of different environmental parameters on the system performance. To this end, we present an extensive empirical study with real-world experiments to provide sufficient data for analysis. By...
The high resolution and widescreen mobile devices have tremendous applications in our daily lives. In this paper, we demonstrate a specific bi-screen video sharing application called WeWatch that a high resolution video is played across screens of two mobile devices. It helps users to enhance their watching experience on the Android system. In order to efficiently use idle mobile devices, we develop...
Over the last few years, MapReduce systems has become popular for processing large-scale data sets and are increasingly being used in web indexing, data mining, and machine learning. Unlike simple application scenarios such as word count, many applications of MapReduce exhibit strong skewed access patterns in real production environment, the data access is non-uniform, often only a small portion of...
In recent years, there has been a growing need for location-based services (LBS), ranging from resource tracking to personal life assistance. The Moving k Nearest Neighbor (MkNN) query is a main problem in the LBS area, which retrieves the top k nearest neighbors while the query consumer moves. Considerable attention is attracted to this query type and a large number of studies are proposed recently...
The target coverage problem is one of the most fundamental challenges in wireless sensor networks. Due to the complexity of the problem (time-dependent network topology and coverage constraints), previous studies have mainly focused on heuristic algorithms and the theoretical bound remains unknown. In this paper, we aim to fill in this gap by providing fundamental results. First, we investigate the...
In the recent years, a progressively growing number of computing and communication services have undertaken the migration from their conventional media to the new unified platform, IP networks. As a consequence, business success of service providers becomes largely determined by the effectiveness of their service management schemes, which require rapid identification of problems and resolution of...
In archival storage systems, there is a huge amount of duplicate data or redundant data, which occupy significant extra equipments and power consumptions, largely lowering down resources utilization (such as the network bandwidth and storage) and imposing extra burden on management as the scale increases. So data de-duplication, the goal of which is to minimize the duplicate data in the inter-file...
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