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최재훈 ( Jaehoon Choi ),정인기 ( Inki Jung ),강종윤 ( Chong-yun Kang ) 한국센서학회 2019 센서학회지 Vol.28 No.1
Energy harvesting is an advantageous technology for wireless sensor networks (WSNs) that dispenses with the need for periodic replacement of batteries. WSNs are composed of numerous sensors for the collection of data and communication; hence, they are important in the Internet of Things (IoT). However, due to low power generation and energy conversion efficiency, harvesting technologies have so far been utilized in limited applications. In this study, a piezoelectric energy harvester was modeled in a vibration environment. This harvester has an oval-shaped configuration as compared to the conventional cantilever-type piezoelectric energy harvester. An analytical model based on an equivalent circuit was developed to appraise the advantages of the oval-shaped piezoelectric energy harvester in which several structural parameters were optimized for higher output performance in given vibration environments. As a result, an oval-shaped energy harvester with an average output power of 2.58 mW at 0.5 g and 60 Hz vibration conditions was developed. These technical approaches provided an opportunity to appreciate the significance of autonomous sensor networks.
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정인기,홍도석,이영태 한국항공대학교 경영연구소 1998 경영연구 Vol.5 No.1
This paper examined that why CT-2 service have failed to succeed in the wireless market and how to make it resurrect to save huge sunk cost and create social welfare. First we summarized the status of CT-2 service market and then examined why CT-2 service had failed to meet users needs in the market. And we examined the potential of CT-2 service and then we suggested marketing strategy of CT-2 service to minimize financial risk and to maximize users benefit, that is: how to activate CT-2 service with a minimum additional input. Finally we tried to offer prospect of wireless services and to position CT-2 service to the right place on the strategic map.
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