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The more wireless sensor networks grow, the more effective security mechanisms are needed. This paper suggests a cryptographic key-management protocol, Energy-Efficient Key-Management protocol. Using a location-based group key allocation, the proposed protocol provides the revocation of compromised nodes and energy-efficient re-keying. Our protocol is(More)
Graphene exhibits exciting properties which make it an appealing candidate for use in electronic devices. Reliable processes for device fabrication are crucial prerequisites for this. We developed a large area of CVD synthesis and transfer of graphene films. With patterning of these graphene layers using standard photoresist masks, we are able to produce(More)
The current epidemic of hospital- and community-acquired methicillin-resistant Staphylococcus aureus (MRSA) infections has caused significant human morbidity, but a protective vaccine is not yet available. Prior infection with S. aureus is not associated with protective immunity. This phenomenon involves staphylococcal protein A (SpA), an S. aureus surface(More)
A specific role for ascorbate (AA) in brain development has been postulated based on a rise of AA levels in fetal brain (Kratzing et al., 1985). To evaluate the role of AA during CNS development, we analyzed the survival, proliferation, and differentiation of AA-treated CNS precursor cells isolated from rat embryonic cortex. Immunocytochemical analyses(More)
Mobile nodes that change their connection point dynamically, are deployed in networks for communication with aircraft, boats, trains and cars. These mobile nodes move together and share the same mobility properties. This paper addresses an efficient location management scheme based on collaboration of mobile nodes to a mobile network. In our proposed(More)
We report the manufacture of novel graphene diode sensors (GDS), which are composed of monolayer graphene on silicon substrates, allowing exposure to liquids and gases. Parameter changes in the diode can be correlated with charge transfer from various adsorbates. The GDS allows for investigation and tuning of extrinsic doping of graphene with great(More)
This study was performed to investigate the differences in food choice, nutrition labeling perceptions, and prevalence of obesity due to meal skipping in Korean elementary school children. A national survey was performed in 2010 to collect data on food intake frequency, understanding of nutrition labeling, and body mass index from 2,335 fifth grade students(More)
Ceftriaxone is widely used in patients for the treatment of serious gram-negative infections. Ceftriaxone can induce some potential side effects, including neurotoxicity, however, nonconvulsive status epilepticus has rarely been reported. We report a case of acute reversible neurotoxicity associated with ceftriaxone. A 65-yr-old woman with chronic kidney(More)
The purpose of this study was to investigate the developmental change of epithelial Na channel function in epithelial cells of rat Reissner's membrane. The Reissner's membrane was isolated from the upper turn of the cochlea at different stages of development. The vibrating probe technique was chosen to measure transepithelial currents under short circuit(More)