Jeong-Uk Kim

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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 pathlimited algorithms. In terms of application range, the path-limited algorithms are more(More)
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)
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)
The purpose of this pilot study was to test whether carvedilol has a protective effect against oxidative deoxyribonucleic acid (DNA) damage in human hypertension in vivo. Carvedilol's antioxidant effect has mostly focused on lipid or amino acid so far. However, there has been no data that carvedilol reduces DNA damage in human hypertension. Never-treated(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)
With all these years’ rapid development in wireless communication, high demands for broadband mobile wireless communications and the emergence of new wireless multimedia applications have constituted the motivation to the development of broadband wireless access technologies. The Long Term Evolution (LTE) system has been specified by the Third Generation(More)
Wireless sensor networks with one static sink often suffer from energy hole problem, which means energy consumption of certain sensors near the sink or on critical paths is much faster than other nodes. Consequently, network partition and isolated nodes are caused. To solve the problem, we propose a Mobile-sink based Energy-efficient Clustering Algorithm(More)