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Wireless sensor networks commonly consist of a large number of tiny sensor nodes that are deployed either inside the target area or very close to it to cooperatively monitor the target area. Energy efficiency and network lifetime are two challenges that most of researchers deal with. In this paper, to improve the performance of sensor networks, we propose(More)
Recently, the effect of genetic variants in the Vitamin D receptor (VDR) gene on Parkinson's disease (PD) has gained interest. However, the precise relationship between VDR polymorphisms and PD remains unclear. In Korea, one study reported an association between VDR gene polymorphisms and PD. However, this study was conducted with a small sample size, and(More)
Traffic patterns in wireless sensor networks (WSNs) usually follow a many-to-one model. Sensor nodes close to static sinks will deplete their limited energy more rapidly than other sensors, since they will have more data to forward during multihop transmission. This will cause network partition, isolated nodes and much shortened network lifetime. Thus, how(More)
Energy efficiency and balancing is one of the primary challenges for wireless sensor networks (WSNs) since the tiny sensor nodes cannot be easily recharged once they are deployed. Up to now, many energy efficient routing algorithms or protocols have been proposed with techniques like clustering, data aggregation and location tracking etc. However, many of(More)
Clustering provides an effective method for improving the performance of wireless sensor networks (WSNs). In this paper, we study that different number of clusters leads to different network performance on the energy consumption, energy balancing and network lifetime. We propose an Energy-Efficient Multi-hop Hierarchical Routing Protocol (MHRP) for wireless(More)
Sink mobility has been proposed to optimize energy efficiency and lifetime for wireless sensor networks (WSNs). Many novel data retrieving algorithms or protocols are proposed based on sink mobility; they can be divided into two classes, namely path-unlimited and path-limited algorithms. In terms of application range, the path-limited algorithms are more(More)
Cloud storage is now an important development trend in information technology. However, information security has become an important problem to impede it for commercial application, such as data confidentiality, integrity, and availability. In this paper, we propose designated verifier provable data possession (DV-PDP). In public clouds, DV-PDP is a matter(More)
In this paper, we propose a novel location technology-based shopping service system (LSSS); describe its design methodology and implementation detail. LSSS incorporates handheld terminals, resource management system and wireless location technology together to make a whole system. The service provided by the system can make customers in a shopping mall(More)
Healthcare targeted for home activity is playing an important role in our daily lives as the number of elderly person is increasing sharply. Researches pointed out that one third of 65-and-over aged person fall per-year. Some detection related work made use of accelerometers or gyroscopes, some use passive infrared or acoustic sensors. But there were some(More)