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김정엽(Jung Yeop Kim),김철(Cheol Kim),김충환(Chung Hwan Kim) Korean Society for Precision Engineering 2019 한국정밀공학회지 Vol.36 No.7
Printed electronics is a technology which is used for manufacturing flexible electronic devices dubbed as next-generation electronics such as wearable applications. To commercialize them, it is important to guarantee their electrical performance under various environmental conditions such as temperature and humidity. Moreover, flexible electronic devices usually undergo mechanical deformations such as bending and twisting, hence, it is necessary to observe the electrical performance of flexible devices under mechanical deformation considering both temperature and humidity. The effects of temperature and humidity on flexible printed electrodes, as an example of the simplest flexible electronics, under static deformation of bending and twisting are studied. Electrodes that do not deform are also strongly affected by temperature and humidity, and the increase in resistances of the electrodes with deformation is highest when twisting. The magnitude of static deformation does not affect the conductivity. The effect of line width is important for the twisting deformation. To commercialize printed electronics devices, the effects of temperature and humidity should be considered, with further consideration of the effects of mechanical deformation on the design of the devices.
지적도면 정보의 보호를 위한 디지털워터마킹 프로토타입시스템 개발
김정엽(Jung-Yeop Kim),원성민(Sung-Min Won),홍성언(Sung-Eon Hong),오이균(Yi-Kyun Oh) 대한공간정보학회 2012 한국지형공간정보학회 학술대회 Vol.2012 No.10
본 연구에서는 지적도면의 특성을 고려하여 디지털 워터마킹 방법론을 설계하고 이를 기반으로 프로토타입시스템 개발하여 보고자 하였다. 그리고 개발된 프로토타입시스템의 성능을 평가하여 봄으로써 적용 가능성을 제시하여 보고자 하였다. 본 연구의 실험 결과를 살펴보면 DWT를 이용하여 워터마크를 삽입하는 방법이 지적도의 저작권 보호를 위한 방안으로 적합하다고 할 수 있으며, 향후 이러한 지적도 저작권 보호 연구를 위한 기초가 될 수 있을 것으로 기대된다.
김재한,김정엽,정관수 忠南大學校 産業技術硏究所 1998 산업기술연구논문집 Vol.13 No.2
The purpose of this study is to develope deterministic optimal reservoir operation rules by integrating dynamic programming, regression analysis, and simulation. The objective function was designed to minimize system-loss function Z. The time dependent loss function is govemed by release R?? for each month. The general constraints for the given objective function are derived from mass balance, upper and lower bounds of the storages and releases. In this study, regression method was applied for inflow and storage to develop the operation rules. The method was successfully applied to the data from Daechung Dam. Differences between observed and predicted value may be caused by the differences in intake amounts.