• Korean Journal of Environment and Ecology
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• v.30 no.5
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• pp.829-836
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• 2016

This study was carried out on Kongju National University and its neighboring area, Mt. Gyeryong national park and Mt. Worak national park in the breeding season of long-tailed tits Aegithalos caudaatus from 2008 to 2012. The result of the inquiry, the nests were found in 15 species of trees, and this result shows me it's not choosy about them. But after having classified them according to the features and analyzed them, long-tailed tits preferred evergreen needleleaf tree and deciduous broad-leaf tree and deciduous bush, especially evergreen needleleaf tree. The concealment rate of long-tailed tits' nests was $11.61{\pm}4.79%]\;4.38{\pm}2.19%$(n=29) in Kongju National University and it's neighboring area, $6.06{\pm}2.31%$(n=43) in Mt. Gyeryong national park and $4.38{\pm}2.19%$(n=32) in Mt. Worak national park. By regional groups, the concealment rates of neighboring nests were almost same, but there are no differences among the areas. The average of the color codes was $26.52{\pm}16.14$(n=32) that those of the nest subtract from those of surroundings of the nest. The nests were procryptic according to their surroundings, and if their nest in a tree were evergreen needleleaf trees, they were made of moss. while if the trees of nest in a tree were yellow because of fungus, made of dried moss, they were yellow, too.

• Nuclear industry
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• v.36 no.11
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• pp.5-11
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• 2016

한국원자력연구원에 반입된 사용후핵연료에 대해 최근 대전 지역 정가와 시민단체 등이 이송 과정, 보관 은폐, 규정 위반 등의 문제를 제기하며 핵연료 반입 중단과 반출을 촉구하고 있다. 그 동안 한국원자력연구원이 수행해온 사용후핵연료의 이송, 보관 및 연구 개발, 그리고 이와 관련한 정보 공개 사항 등을 QA 방식으로 종합했다.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2014.10a
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• pp.409-410
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• 2014

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2012.10a
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• pp.645-646
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• 2012

• Defense and Technology
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• no.8 s.174
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• pp.36-43
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• 1993

신예 항공기들은 고가의 무기와 첨단전자장비들을 갖추고 있기 때문에 가격 또한 엄청나게 비쌉니다. 따라서 전투시에 상대의 후방까지 깊숙하게 침투시에 상대의 후방까지 깊숙하게 침투하여 목표물을 공격하되, 아군 항공기의 손실은 최소로 줄이는 것이 승패를 좌우하는 매우 중요한 요소입니다 따라서 항공기의 생존성을 제고하기 위해서는 상대의 레이다에 포착되지 않는 은폐기술 즉, 스텔스(stealth)성능이 필수적입니다

• Information and Communications Magazine
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• v.30 no.1
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• pp.67-76
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• 2012

본고에서는 jamming 이나 은폐 등으로 인하여 통신 채널이 동적으로 변화하는 전장환경에서 dynamic spectrum access(DSA) 기술을 토대로 보다 안정된 통신을 하는 기술을 알아본다. DSA 통신의 핵심기술을 설명하고, 미국의 DARPA에서 수행한 neXt Generation(XG) 프로젝트와 Wireless Network after Next(WNaN) 국방통신 프로젝트를 소개한 후에 결론에서 시사점을 다룬다.

• Proceedings of the Korea Contents Association Conference
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• 2018.05a
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• pp.479-480
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• 2018

본 연구는 임진왜란이 기억의 주체에 따라 다양하게 변용되는 방식을 사관, 신하, 작가, 영화감독의 텍스트를 통해 밝힌 것이다. 이를 통해 역사의 진실이 변주되는 양상을 보여주었다. 문제는 역사적 사건이 기억의 범주에서 돋보이고 은폐됨에 따라 역사의 진실은 당시와 현재에도 다르게 나타난다는 것이다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.26 no.11A
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• pp.1880-1888
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• 2001

In wireless communication systems, transmission errors degrade the reconstructed image quality severely. Among various techniques which reduce the degradation, the error concealment technique yields good performance without overheads and the modification of the encoder. In this paper, we have proposed the technique for recovering the corrupted motion vector using the edge direction of blocks which surround the corrupted block, when the video information is compressed by H.263 standard. We uses the property that each object in video sequences shows the same motion. For the estimation of edge directions, the first AC coefficients of blocks are used. Extensive simulation results show that the proposed technique yields good performance with a reduced computational complexity.

• Korean Journal of Environment and Ecology
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• v.29 no.6
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• pp.850-857
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• 2015

This study was aimed to identify the characteristics of nest and breeding site conditions of Chinese Egret (Egretta europhotes) that breed in the uninhabited islets of the western coast of South Korea. It is expected that the information collected through this study can contribute to providing basic information required when building and managing artificial nests in their natural breeding habitats. Chinese Egrets make their nests in the shrub layers of Long Leaf Elaeagnus (Elaeagnus macrophylla), Arrow Bamboo (Pseudosasa japonica), and Baby Brier (Rosa multiflora). A total of 50 breeding nests of Chinese Egret were investigated in June and July 2013, with area-wise distribution as follows: Seomando (11 nests), Hwangseodo (14 nests), Mokdo (10 nests), and Napdaekiseom (15 nests). Vegetation coverage (cover, %), height from the ground to the top (height, cm), thickness from top to bottom of the nest (thickness, cm), reuse period, major axis (cm), minor axis (cm), and depth (cm) of each nest were measured. According to the results of the study on the nest characteristics of 4 breeding groups, the nests in Hwangseodo had the highest coverage, the nests in Mokdo were built in the highest places, the nests in Napdaekiseom showed the longest reuse period, and the nests in Mokdo had the greatest depth. The differences in height and reuse period were significant between Mokdo and Napdaekiseom. Moreover, there were significant differences in reuse period and depth between Seomando and Hwangseodo. There were significant differences in cover, minor axis, and depth between breeding groups that built nests on Arrow Bamboo (Mokdo and Napdaekiseom) and Baby Brier (Seomando and Hwangseodo). Nest characteristics of Chinese Egret were generally similar, while some variables showed different values for different breeding groups.

• Science of Emotion and Sensibility
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• v.17 no.4
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• pp.79-88
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• 2014

Smart-phones have become a vital part of our lives, paying a bill online, shopping using applications, using email and office applications. Therefore, the risk of the leakage of personal informations and the misuse of them becomes high, for the cost of loosing smart-phone. Many types of smart-phone security features such as password, slide-lock, and pattern lock have been introduced. However, those security locks make users not to easily access and use a smart-phone. There is tradeoff between security on one hand, and usability and cost on the other. This paper propose Self-Concealment to solve the tradeoff problem and demonstrate the effect through the experiment. In sum, Self-Concealment lowers smart-phone experience; however increases smart-phone use intension. This paper has implication for proposing new User Experience (UX) construct to resolve the trade-off between security and usability.