• 한국신재생에너지학회:학술대회논문집
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• 2005.11a
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• pp.173-181
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• 2005

현대문명의 총아로 각광받는 노트북, Mobile 컴퓨터는 날로 소형화 또는 경량화 되고 있다. 그러나 이와 같은 휴대용 전자기기는 전력소비가 비교적 많은 관계로 옥외에서 사용시에 추가적인 전력 공급이 없이는 사용시간이 제한된다. 따라서 주간에 태양전지를 이용하여 휴대용 전자기기에 적합한 직류전원을 직접 공급할 수 있다면 지속적인 활용이 가능하다. 따라서 야외에서 장시간 사용할 시에는 태양전지의 발전량을 최대로 얻기 위하기 저 전력 소모형태의 태양 추적장치를 개발하여 활용할 필요가 있다. 이와 같은 제품이 개발될 경우에는 야외훈련이 많은 군부대의 작전시에 많이 사용되는 무전기, 휴대용 컴퓨터(Notebook 또는 Mobile Computer) 등의 충전용 전원으로 활용할 수 있다. 동시에 태양에너지인 청정에너지를 활용함으로서 환경공해를 최소화 할 수 있게 된다.

• 한국신재생에너지학회:학술대회논문집
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• 2006.06a
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• pp.584-587
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• 2006

An energy generating greenhouse based on fluoropolymer envelope and fresnel lens is proposed. The outstanding properties of the fluoropolymer films make them very suitable for large scale solar applications. Extremely high optical transmission over the whole solar spectrum, combined with mechanical strength, and durability allows us to design a highly optimized greenhouses for both plant growing and energy generation. Systems such as photovoltaic triple junction cells are especially attractive since they have up to 35% efficiency with much less cell material when the sun beam is focused with concentrators such as fresnel lenses. Cooling such devices will enhance the efficiency and provide useful thermal energy that could be further utilized for various applications depending on the local demands. This article introduces the basic ideas and principles of the energy generating greenhouses as a first step towards the actual deployment of such systems under Korean environment.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.36 no.6B
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• pp.618-630
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• 2011

Mobile RFID system, that consists of the existing RFID reader mounted on the mobile devices such as smartphones, is able to provide the users a variety of services and convenience. Although the users can get the information about a certain product anytime anywhere, there is high probability that their privacy may be violated because their belongings with RFID tags can be scanned by other mobile readers at any time. Several RFID authentication schemes have been proposed to deal with these privacy issues. However, since the existing solutions require heavy computation on the tag side, most of them is not applicable to the general low-cost passive tags which do not have any processing unit. In this paper, we propose the efficient authentication scheme for mobile RFID system applicable to the passive tags as well as the active ones by the best use of computing capability of mobile devices. The proposed scheme satisfies the import security issues such as tag protection, untraceability, anti-traffic analysis. We also implement the proposed scheme on top of real smartphone for feasibility and show the experimental results from it.