Yoonjae Choi

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Wireless sensor networks have many sensor nodes with a limited energy in a limited area. One of key issues in wireless sensor networks is to prolong the network lifetime. In this paper, we propose a scheme to construct an energy-efficient cluster structure in wireless sensor networks. Our scheme considers both the residual energy of sensor nodes and the(More)
The syndrome of inappropriate antidiuretic hormone secretion (SIADH) can be caused by a variety of drugs. Dopaminergic drugs might enhance the secretion of the antidiuretic hormone arginine vasopressin by reducing γ-amino butyric acid release through the dopaminergic receptor in supraoptic nucleus. A 75-year-old woman with Parkinson's disease developed(More)
OBJECTIVE We performed this study to assess the effect of an antiplatelet agent on the progression of white matter hyperintensities (WMH). METHODS From August 2003 to May 2005, we consecutively enrolled patients who underwent brain magnetic resonance imaging (MRI) for health check-up purposes and showed no significant findings other than WMH of any(More)
Thanks to the development of the Internet, people can easily access a vast amount of music. This brings attention to application systems such as a melody-based music search service or music recommendation service. Extracting melodies from music is a crucial process to provide such services. This paper introduces a novel algorithm that can extract melodies(More)
Persons with subjective cognitive decline are reported to experience a decline in cognitive capacity without measurable cognitive deficits on objective testing.1 In a meta-analysis, subjective cognitive decline was present in about 17% of healthy elderly.2 The pathophysiological process of Alzheimer’s disease (AD) is thought to begin many years before the(More)
A point-to-point interface with a clock embedded scheme (CES) in Fig. 29.5.1 is generally adopted in an intra-panel interface due to the poor signal integrity of the multi-drop topology, data and clock channel skews and EMI emission from the forwarded clock signal channels. Clock recovery in RX without a reference clock channel is usually carried out using(More)
Event extraction is vital to social media monitoring and social event prediction. In this paper, we propose a method for social event extraction from web documents by identifying binary relations between named entities. There have been many studies on relation extraction, but their aims were mostly academic. For practical application, we try to identify 130(More)
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