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저지 대역 특성을 갖는 UWB용 Printed Circle 안테나
이경석(Kyung-seok Lee),김규철(Gue-chol Kim),최병하(Byoung-ha Choi) 한국정보기술학회 2009 Proceedings of KIIT Conference Vol.2009 No.-
본 논문에서는 Ultra-Wideband(UWB) 통신을 위한 새로운 소형 주파수 대역 저지 안테나를 설계 하였다. 설계된 안테나는 광대역 특성을 가지며, IEEE 802.11a와 HIPERLAN/2에 의해 사용이 제한된 5.15~5.825㎓에서 주파수 대역 저지 특성을 갖는다. 광대역 특성을 얻기 위하여 부분적인 그라운드면과 notch cut 구조를 사용하였고 저지 대역 특성을 얻기 위해 패치면에 U-slot을 삽입하였다. 설계된 안테나는 저지 대역인 4.90~5.92㎓ 대역을 제외하고 3.1~10.6㎓ 대역에서 정재파비 2이하를 만족하는 광대역 특성을 나타낸다. In this paper, a compact antenna with band-rejected characteristic for Ultra-Wideband(UWB) applications is proposed. The designed antenna not only shows sufficient impedance bandwidth but has band-rejected characteristic for the frequency band of 5.15~5.825㎓ limited by IEEE 802.11a and HIPERLAN/2. To obtain both properties of wideband band rejection, the techniques of a partial ground plane and embedded thin U-slot into planar radiator are used respectively. A designed antenna satisfied a VSWR less than 2:1 for the frequency band of 3.1~10.3㎓ with band rejection of 4.90~5.92㎓.
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어성초, 자소엽, 녹차 식물 추출 혼합물의 항산화 및 Tyrosinase 저해 효과에 관한 연구
이경은 ( Kyung Eun Lee ),이은선 ( Eun Sun Lee ),강상구 ( Sang Gu Kang ) 대한화장품학회 2015 대한화장품학회지 Vol.41 No.2
In the present study, antioxidant activities and tyrosinase inhibition of Perilla frutescens, Houttuynia cordata and Camellia sinensis extracts and the extract mixtures (PHC) were investigated. PHC showed 80.2% and 98.0% of free radical scavenging activity in DPPH and ABTS analysis, respectively, and 50% tyrosinase inhibition in 1000 μg/mL concentration. HaCaT cells did not show cell toxicity in 100 μg/mL of the PHC. Furthermore, HaCaT cell viability by co-culture with extract H. cordata was increased more than 10% compared with untreated cells. However, the cell viability was decreased in 500 μg/mL of the extract C. sinensis and the PHC. These results suggested that about 100 μg/mL concentration of the PHC showed proper tyrosinase inhibitory effect and antioxidant activities. The PHC could be used as multifunctional cosmeceutical agents.
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이경구(Lee Kyung-Koo) 대한건축학회 2010 大韓建築學會論文集 : 構造系 Vol.26 No.10
Interest in the behavior and resistance of structures for blast mitigation of high explosive charges is growing more and more. In this paper, the residual axial resistance of steel compressive members damaged by blast loading was precisely evaluated using the explicit-to-implicit finite element analysis method. The empirical blast loading, the blast-induced damage in terms of structural deformation, and the members' strength against axial loading were simulated. The effects of the structural shapes and the scaled distance from explosive charge to structure on the blast response and residual capacity of the compressive members were estimated using parametric studies. The linear relationship between blast-induced horizontal deformation and residual axial strength of blast-damaged steel compressive members carrying the same plastic moment capacity was observed based on the analysis results.
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광고 크리에이티브 표현 확장 가능성에 관한 연구 -정교화 가능성 모델의 한계점 및 실무적 표현 방향을 중심으로-
이경아 ( Kyung A Lee ) 한국정보디자인학회 2007 정보디자인학연구 Vol.10 No.-
The purpose of this study was to suggest the possibility of creative extension in the creative field. We have collected some critical review data of the theory, Elaboration Likelihood Model which has researched by Petty and Cacioppo in 1986. The current media situation, communication theory and consumers trend have been largely changed comparing with the period of 1986, when the Elaboration Likelihood Model was suggested. But by this time, Elaboration Likelihood Model has been frequently refered by many academic researchers and professionals in the communication fields. For this reason, many creators in the communication field have often been confused in doing their creative works. This study tried to find the possibility of reducing the creators` confusion and extending creativity through the application theory.
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디지털 마인드맵을 활용한 감상수업이 메타인지와 자기주도 학습에 미치는 영향
이경아(Lee, Kyung-A) 한국미술교육학회 2013 美術敎育論叢 Vol.27 No.1
본 연구의 목적은 감상수업에서 디지털 마인드맵을 활용하여 학생들의 자기주도 학습과 매타인지에 의한 확산적 사고를 지향하게 하는 데 있다. 미술교육의 관점에서 감상수업이 주는 교육적 의미를 고려해 볼 때, 기존의 교과서 위주의 텍스트 자료 및 PPT 감상이 주를 이루는 강의식 교수-학습 과정은 개선될 필요가 있다. 이에 본 연구에서는 2012-2013 학년도 현재까지 연구자가 담당하는 중학교 2학년 5개 학급을 대상으로 감상수업에 디지털 마인드맵을 적용하고 그 결과를 관찰하였다. 연구의 결과 학생들의 자기주도 학습과 메타인지 측면에서 유의미한 시사점을 도출할 수 있었다. 특히 개개인의 인지적 사고 세계를 고려한 미적체험의 전개방식은 감상수업에 새로운 방향을 제시해 주었다. The purpose of this study is to improve divergent thinking through self-directed learning and meta cognition of students using digital mind map in appreciation class. Considering the educational meaning of appreciation class from the point of view of art education. instructor-led teaching learning process mainly proceeded by existing coursebook-oriented text material and PPT appreciation needs to be improved. In this context. the researcher applied digital mind map and observed the results in appreciation class aiming at five classes of second year class in my charge from 2012 to 2013. In conclusion. the researcher deduced meaningful implication in the respects of self-directed learning and meta cognition. In particular. modes of development of esthetics experience considering individual cognitive thinking system showed the new way in appreciation class.
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