• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2013.04a
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• pp.472-475
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• 2013

This study proposes an equivalent bell model for the Sacred Bell of the Great King Seongdeok An equivalent bell model bas the modal property of the real bell and it consists of an axi-symmetric bell body and a point mass, The bell model is constructed by the finite element analysis based upon the theory of a revolutionary shell. Using the equivalent bell model. the beat period can be controlled by decreasing the thickness of local area. This study aims at showing a beat period control method for a large bell having the similar size to the Sacred Bell of the Great King Seongdeok.

• Journal of Internet Computing and Services
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• v.10 no.4
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• pp.151-160
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• 2009

Wireless network solution is used in many area because of free mobility and easy of establishment. Sensors that compose wireless network need protocol that support wireless communication to share information each other. As representative protocol, we currently witnessed IPv6 protocol. However, due to the limitation of sensors's electric power and computing ability, it is inefficient that each sensors use this protocol. In this paper, we designed improved sensor circuit that can heighten energy efficiency in sensor network to solve these problem and composed algorithm that can pare down energy consumption using method to make unnecessary sensor in sleep-mode.