폴리머 기판 위에 전사된 실리콘 박막의 기계적 유연성 연구

이미경,이은경,양민,천민우,이혁,임재성,좌성훈,Lee, Mi-Kyoung,Lee, Eun-Kyung,Yang, Min,Chon, Min-Woo,Lee, Hyouk,Lim, Jae Sung,Choa, Sung-Hoon 한국마이크로전자및패키징학회 2013 마이크로전자 및 패키징학회지 Vol.20 No.3

현재까지 유연한 전자소자 개발은 주로 인쇄전자 기술을 이용한 유기재료 기반 위주로 연구 및 개발이 진행되어 오고 있다. 그러나 유기 기반의 소자는 성능 및 신뢰성에 많은 제약이 있다. 따라서 본 논문에서는 무기재료 기반의 실리콘 고성능 유연 전자소자를 개발하기 위한 방법으로 나노 및 마이크로 두께의 단결정 실리콘 박막을 transfer printing 기술을 이용하여 유연기판에 전사하여 제작하였다. 제작된 유연소자는 굽힘 시험과 인장 시험을 통하여 유연 신뢰성을 평가하였다. PI 기판에 부착된 두께 200 nm의 박막은 굽힘 시험 결과, 곡률 반경 4.8 mm 까지 굽힐 수 있었으며, 따라서 굽힘 유연성이 매우 우수함을 알 수 있었다. 인장 시험 결과 인장 변형률 1.8%에서 박막이 파괴되었으며, 기존 실리콘 박막에 비하여 연신율이 최대 1% 증가됨을 알 수 있었다. FPCB 기판에 부착된 마이크로 두께의 실리콘 박막의 경우 칩이 얇아질수록 굽힘 유연성이 향상됨을 알 수 있었으며, $20{\mu}m$ 두께의 박막의 경우 곡률 반경 2.5 mm 까지 굽힐 수 있음을 알 수 있었다. 이러한 유연성의 증가는 실리콘 박막과 유연 기판 사이의 접착제의 완충작용 때문이다. 따라서 유연 전자소자의 유연성을 증가시키기 위해서는 박막 제작 시 공정 중의 결함을 최소화하고, 적절한 접착제를 사용한다면 유연성을 크게 증가시킬 수 있음을 알 수 있었다. Development of flexible electronic devices has primarily focused on printing technology using organic materials. However, organic-based flexible electronics have several disadvantages, including low electrical performance and long-term reliability. Therefore, we fabricated nano- and micro-thick silicon film attached to the polymer substrate using transfer printing technology to investigate the feasibility of silicon-based flexible electronic devices with high performance and high flexibility. Flexibility of the fabricated samples was investigated using bending and stretching tests. The failure bending radius of the 200 nm-thick silicon film attached on a PI substrate was 4.5 mm, and the failure stretching strain was 1.8%. The failure bending radius of the micro-thick silicon film attached on a FPCB was 2 mm, and the failure strain was 3.5%, which showed superior flexibility compared with conventional silicon material. Improved flexibility was attributed to a buffering effect of the adhesive between the silicon film and the substrate. The superior flexibility of the thin silicon film demonstrates the possibility for flexible electronic devices with high performance.

지속가능한 낙농산업의 길 - 다양한 유제품으로 만드는 건강한 식탁

이미경,Lee, Mi-Gyeong 한국낙농육우협회 2015 낙농·육우 Vol.35 No.8

AAFP학회와 2006 북미 고양이학회 참관기

이미경,Lee, Mi-Gyeong 대한수의사회 2006 대한수의사회지 Vol.42 No.12

소아와 고령자에서 급성 충수염의 임상적 특성

이미경,이상희,김재만,Lee, Mi-Kyong,Lee, Sang-Hee,Kim, Jae-Man 대한소아외과학회 2011 소아외과 Vol.17 No.2

Acute appendicitis is one of the most common diseases of young people that requires emergency operation. This is especially true for those age 10 years old and older. However, the numbers of cases of appendicitis are increasing in both the young and the elderly. The main purpose of this study is to understand the clinical features of acute appendicitis in children and elderly patients. We retrospectively compared clinical characteristics in 4 groups of patients who underwent appendectomy in our hospital. There were 16 patients in the pre-school age group, 9 were males and 7 females. The total number of patients in the juvenile group were 287, 156 were males and 131 females. The total numbers of patients in the adult group were 794, 436 were males and 358 females. The numbers of elderly patients were 189, 91 were males and 98 females. Complicated appendicitis was found in 15 patients (93.7 %) in the pre-school age group, 79 patients (27.5 %) in the juvenile group, 332 patients (41.8 %) in the adult group, and 96 patients (50.7 %) in the elderly group. Four patients (40 %) had generalized panperitonitis in the pre-school group. The occurrence of perforated appendicitis was the highest in the pre-school age group and the lowest in the juvenile group. Since generalized panperitonitis has a higher incidence in the pre-school age group, prudent and careful diagnosis and treatment are required for the pre-school age group.

유방 소엽성 암종의 복수의 세포학적 소견 - 1예 보고 -

이미경,이광길,Lee, Mi-Kyung,Lee, Kwang-Gil 대한세포병리학회 1996 대한세포병리학회지 Vol.7 No.1

We experienced a case of infiltrating lobular carcinoma of the breast in the ascitic fluid. The patient was a 49 year-old woman who presented with a palable mass of 3 months duration in the left upper quadrant of the abdomen and abdominal distension. Five years ago, she had undergone left radical mastectomy with chemotherapy and radiotherapy for infiltrating lobular carcinoma of the breast. The ascitic fluid smears revealed singly scattered small round to elliptical cells, many of which were arranged in characteristic indian-file patterns consisting of 3 to 5 cells. The tumor cells had scanty cytoplasm, rare cytoplasmic vacuoles and marked chromatin clumping with small, but prominent nucleoli.

기고 - 우유! 우리식탁의 중심이 되다.

이미경,Lee, Mi-Gyeong 한국낙농육우협회 2016 낙농·육우 Vol.36 No.9

Chloride Meter(CL-2Z형)를 이용한 담배잎 중 chloride의 신속한 검정방법

이미경,정훈채,김용연,윤연현,Lee, Mee-Kyoung,Jeong, Hun-Chae,Kim, Yong-Yeon,Yu, Yun-Hyun 한국연초학회 2006 한국연초학회지 Vol.28 No.2

The aim of this study is to develop a simple and rapid field method for the determination of chloride content in tobacco green or cured leaves. To set up a practical process, several factors such as the proper sampling position of each leaf, the size of leaf lamina pieces for blending, the substitution of deionized water fur the extracting solution, 0.1N $HNO_3$, the submerging durations before blending, and the standing times before measuring were studied using flue-cured and burley tobacco with a stable and reproducible Chloride Meter, KRK CL-2Z. From the results, chloride contents of tobacco leaves could be analyzed with the Chloride Meter(CL-2Z) using the suspension of 14 mm diameter leaf disks after soaking in distilled water for 30 min., blending with a mini-blender for 30 seconds. The chloride contents measured in this way showed highly significant correlations with ones by the conventional potentiometric method using an ion meter-chloride electrode and $AgNO_3$ titration. In our method, the procedures such as drying, powdering and weighing samples, and using chemical reagents for extraction (0.1N $HNO_3$) and titration(0.028N $AgNO_3$) could be eliminated. These results suggest that the newly constructed method using the Chloride Meter is more efficient to determine the chloride content of tobacco leave in comparison with the one by the Ion $Meter:AgNO_3$ titration.

청계천복원관련 담론분석을 통한 환경인식 지형연구

이미경,김한배,Lee, Mi-Kyung,Kim, Han-Bai 한국조경학회 2009 韓國造景學會誌 Vol.36 No.6

도시담론은 도시공간에 대한 이해, 개방적 논의와 성찰을 통해 보다 나은 삶의 공간을 만드는 도구가 될 수 있다. 도시담론은 도시환경의 물리적 사회적 쟁점들을 부각시킨다. 이의 해결로 시민집단의 참여를 독려하며 간담론적인 합의도출을 통한 도시환경의 공동체적 발전방향을 유도할 수 있다. 청계천이라는 공간은 2003년 청계천 복원사업 에 관한 논의가 본격적으로 시작된 이래 2005년 공사가 완공되고 현재에 이르기까지 다양한 시각의 도시담론을 형성시켜왔다. 청계천복원관련 담론은 조경, 생태, 도시, 건축, 정치경제, 행정적 관점 등 다양한 시점에서 청계천을 접근해 갔으며, 다양한 쟁점들과 논쟁구도를 형성해 나갔다. 본 연구는 다양한 분야에서 노정되고 있는 청계천복원에 관한 담론내용을 정리 및 분석, 해석하였다. 집단 간의 가치관의 차이와 갈등, 간담론적 관계를 규명하기 위해서 분석의 틀을 근거로 하여 담론을 분야별로 유형화하고 시기별로 이념집단 간의 대립구조에 대해 분석하였다. 이를 토대로 청계천 담론을 매개로 한국 시민사회가 인지하고 있는 환경인식의 현 지형을 진단하고 지속 가능한 도시환경 발전방향을 조망하고자 하였다. 분석 결과, 사업의 추진 주체인 서울시의 실용적 접근에 대하여 시민사회와 보존주의 및 급진주의 집단은 가장 첨예한 대립구도를 형성했다. 도시설계나 조경 등 기술 분야는 절충주의적 태도를 가지고 양자 간 접점을 찾아내기 위해 노력했다. 앞으로 이러한 도시담론 활성화 추세에 조경분야도 보다 능동적으로 참여하여 다양한 견해들을 수용하고 독자적이면서도 공공적 정의에 부합하는 입장을 모색해 나갈 필요성을 발견하게 되었다. Urban discourse can be used to create a better living environment through open thinking, understanding and discussion. It raises both physical and social issues surrounding the urban environment. It can encourage the participation of citizen groups and lead the way to develop a community-oriented urban environment through inter-discourse agreement. The urban space of Cheonggye Stream has produced a wide range of urban discourse from 2003 to the present. Discourse regarding the Cheonggye Stream restoration project has been approached by fields including landscape architecture, ecology, urbanism, architecture, politics, and economics, among others. This discourse has reduced a variety of issues and ranges of debate. This study has classified these discussions into related fields and ideological attitudes, analysed their content, and interpreted their meaning. In order to examine the mutual relationships existing among these discourses by different ideological groups, an analytical framework was established byputting classified versions of discourses into a coordinate diagram. The overall topography showing the present status of Korea public awareness regarding the urban environment could therefore be determined. As a result, it was found that the disciplines of landscape architecture took a middle ground between groups with practical and radical ideologies regarding the Cheonggye Stream project and was a mediator for both poles to find a point of contact. However, participatory discourse requires the disciplines of landscape architecture to participate more actively in the discourses on urban environment and take a more active stand corresponding to the zeitgeist and people's sense of public justice.

Inhibitory Activity of Three Varieties of Adlay (Coix Seed) on Adipocyte Differentiation in 3T3-L1 cells

이미경,Eunjin Shin,Qing Liu,황방연,Jungbok Lee,김선여,Jae-Hak Lee 한국생약학회 2010 Natural Product Sciences Vol.16 No.4

In obesity, adipocytes undergo abnormal growth characterized by increased cell numbers and differentiation. Thus, inhibition of mitogenesis of preadipocytes and their differentiation to adipocytes would be beneficial for the prevention and progression of obesity. In the present study, we attempted to evaluate anti-adipogenic activity of adlay (Coix seed, the seed of Coix lacryma-jobi L. var. ma-yuen Stapf) employing preadipocytes cell line, 3T3-L1 as an in vitro assay system. Because several varieties of adlay are in use in Korea, anti-adipogenic activity of three varieties of adlay such as Sang-Gang, Jo-Hyun and Yulmu-Ilho was evaluated. All the three varieties of adlay showed significant inhibitory activity on adipocyte differentiation as assessed by measuring fat accumulation using Oil Red O staining. Adlay, however, showed little effects on adipocyte proliferation. Further studies with interval treatment demonstrated that adlay exerted inhibitory activity on adipocyte differentiation via acting on early stage of adipogenesis. Taken together, adlay might be useful in the prevention of obesity.

Ln^{3+}$-DMF계의 ^1H $-NMR 연구 (Ⅰ). DMF 분자의 교환과 CHO기의 양성자 화학적이동

이미경,윤창주,최영상,Mi-Kyung Lee,Chang-Ju Yoon,Young-sang Choi 대한화학회 1992 대한화학회지 Vol.36 No.3

Ln$(NO_3)_3$/DMF 상자성 용액의 양성자 선-나비와 화학적이동을 240 K부터 380 K 사이에서 측정하였다. 이들 데이터로부터 DMF 분자의 CHO기에 대한 배위구 교환속도와 열역학 교환파라미터를 추출하였다. 1/$T_2$ 와 ${\Dellta}{\omega}$ 데이터의 온도의존성을 자세하게 분석하고 고찰하여 결과를 정리하였다. 분석의 결과를 살펴보면 짝짓지 않은 전자 스핀이 몇몇 $Ln^{3+}$이온에서 첫 배위구를 넘어 퍼지면서 bulk 용매의 DMF 분자로 스칼라이완의 기여를 제공하는 것 같다. Proton lineshapes and chemical shifts of paramagnetic solutions of Ln$(NO_3)_3$ in DMF have been measured over the temperature range 240K to 3807K. Solvation sphere exchange rates and the thermodynamic exchange parameters for CHO group of the DMF molecules have been extracted from these data. The results were established through a detailed analysis and discussion of the temperature depending data of the 1/$T_2$ and ${\Dellta}{\omega}$ data were analyzed in detail, and it has been found that delocalization of the unpaired electron spin from some $Ln^{3+}$ ion to DMF molecules beyond the first solvation shell would occur, giving rise to a scalar relaxation contribution in the bulk solvent.