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.

AAFP학회와 2006 북미 고양이학회 참관기

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

가지 물추출물의 3T3-L1 지방전구세포 분화 억제효능

이미경,류청,황방연,김선여,이재학,Lee, Mi-Kyeong,Liu, Qing,Hwang, Bang-Yeon,Kim, Sun-Yeou,Lee, Jae-Hak 대한약학회 2011 약학회지 Vol.55 No.4

Abnormal growth of adipocyte characterized by increased cell numbers and differentiation is considered as an major pathological characteristic feature in obesity. Thus, inhibition of mitogenesis of preadipocytes and their differentiation to adipocytes would be beneficial for the prevention and inhibition of obesity. In the present study, we attempted to evaluate anti-adipogenic activity of eggplants (the fruits of Solanum melongena L.) employing preadipocytes cell line, 3T3-L1 as an in vitro assay system. Water extract of eggplants significantly inhibited adipocyte differentiation when treated during adipocyte differentiation process, as assessed by measuring fat accumulation using Oil Red O staining. Eggplant extract, however, showed little effects on fully differentiated adipocytes. Eggplant didn't show significant toxicity up to 500 ${\mu}g$/ml to the 3T3-L1 cells. Further studies with interval treatment demonstrated that eggplant exerted inhibitory activity on adipocyte differentiation via acting on early stage of adipogenesis. Conclusively, eggplants are suggested to be beneficial for the prevention of obesity.

슬관절 전치환술 환자의 조기퇴원 후 가정간호 운동 프로그램이 슬관절기능 상태와 삶의 질에 미치는 효과

이미경,이인희,주정혜,황문숙,서재곤,성영희,Lee, Mi-Kyoung,Lee, In-Hee,Ju, Jung-Hea,Hwang, Mun-Suk,Seo, Jai-Gon,Sung, Young-Hee 대한근관절건강학회 2005 근관절건강학회지 Vol.12 No.2

Purpose: The aim of this study was to investigate the effects of home care exercise program on knee joint function(WOMAC) and the quality of life in patient with total knee replacement arthroplasty. Method: Forty-one subjects were sampled according to research criteria, and divided into two groups : 21 out of experimental group and 20 out of control group. The patients having treatment of total knee replacement arthroplasty were out of the hospital. After surgery executed, it took 8days for them to recovere their health conditions since 10th day, the experimental group received the home care exercise program per regularly four days interval. Results: 1) After applying home care exercise program, the total score on the WOMAC Index for the control group was $3.09{\pm}.76$. The score of the experimental group was $3.55{\pm}.55$ which is statistically higher than that of the control group. (P=.007). 2) After applying home care exercise program, the score of the quality of life for the control group was $3.09{\pm}.50$. The score of the experimental group was $3.46{\pm}.35$ Which is statistically higher than that of the control group. (P=.007). Conclusion: This figures show that home care exercise program has good results. These findings also indicate that the services of home care exercise program are alternatives for the hospitalization.

고온 신뢰성 시험에서 발생된 플렉서블 OLED의 휨 변형

이미경,서일웅,정훈선,이정훈,좌성훈,Lee, Mi-Kyoung,Suh, Il-Woong,Jung, Hoon-Sun,Lee, Jung-Hoon,Choa, Sung-Hoon 한국마이크로전자및패키징학회 2016 마이크로전자 및 패키징학회지 Vol.23 No.1

플렉서블 OLED는 매우 다양한 유기(organic) 및 무기 물질로 이루어져 있으며, 각 층을 증착하는 과정에 의하여 고온에 의한 휨(warpage)이 발생한다. 휨으로 인하여 발생한 굽힘 변형은 후속 공정에 많은 영향을 미치며, 궁극적으로 생산 수율 및 신뢰성을 저하시킨다. 본 연구에서는 플렉서블 OLED 소자의 고온 환경신뢰성 시험 및 공정 단계에서 발생하는 휨 변형을 수치해석을 이용하여 예측하였으며 실험 결과와 비교하였다. 이를 통하여 휨에 가장 큰 영향을 미치는 재료를 파악하고, 궁극적으로 휨을 최소화 함으로써 플렉서블 OLED의 신뢰성을 향상시키고자 하였다. 휨의 측정 및 수치해석 결과, 편광 필름과 베리어 필름이 휨에 많은 영향을 줌을 알 수 있었으며, OCA가 휨에 미치는 영향은 미미하였다. 플렉서블 OLED의 휨에 가장 큰 영향을 주는 소재는 plastic cover이였으며, 휨을 최소화하기 위한 plastic cover 소재의 최적 물성을 실험계획법으로 계산한 결과, 탄성 계수는 4.2 GPa, 열팽창계수는 $20ppm/^{\circ}C$ 일 경우 플렉서블 OLED의 휨은 1 mm 이하가 됨을 알 수 있었다. Flexible organic light-emitting diode (OLED) devices consist of multi-stacked thin films or layers comprising organic and inorganic materials. Due to thermal coefficient mismatch of the multi-layer films, warpage of the flexible OLED is generated during high temperature process of each layer. This warpage will create the critical issues for next production process, consequently lowering the production yield and reliability of the flexible OLED. In this study, we investigate the warpage behavior of the flexible OLED for each bonding process step of the multi-layer films using the experimental and numerical analysis. It is found that the polarizer film and barrier film show significant impact on warpage of flexible OLED, while the impact of the OCA film on warpage is negligible. The material that has the most dominant impact on the warpage is a plastic cover. In order to minimize the warpage of the flexible OLED, we estimate the optimal material properties of the plastic cover using design of experiment. It is found that the warpage of the flexible OLED is reduced to less than 1 mm using a cover plastic of optimized properties which are the elastic modulus of 4.2 GPa and thermal expansion coefficient of $20ppm/^{\circ}C$.

DARNN 기반 서울시 행정구역별 COVID-19 확산 예측 모델

박연재(Yeonjae Park),전영표(Young Pyo Jun),이홍래(Hongrae Lee),조영래(Young-Rae Cho) 한국정보과학회 2021 정보과학회 컴퓨팅의 실제 논문지 Vol.27 No.11

2020년 한해동안 서울시에는 코로나바이러스 확진자가 지속적으로 발생하였다. 서울시 각 행정구역마다 코로나바이러스 확진자의 주 발생 원인이 다를 수 있지만, 공통적인 요인도 존재한다. 이 발생원인은 소규모 감염 요인과 집단 감염 요인으로 구분된다. 본 연구에서는 다양한 감염 요인에 대한 변수들을 최적화하는 DARNN (Dual-Stage Attention-Based Recurrent Neural Network) 기법을 사용하여 COVID-19 확산 예측 모델을 제시한다. 2020년 서울시의 각 행정구역별 코로나바이러스 확진자 수에 대한 시계열 데이터와 확진자 발생 패턴에 대한 행정구역들 사이의 상관관계, 각 행정구역별 유동인구 등의 정보를 활용한 실험에서, 제안된 DARNN 모델은 기존에 널리 활용되는 LSTM (Long Short-Term Memory) 모델과 비교하여 우수한 예측 정확도를 보였다. In 2020, several coronavirus confirmed cases had been reported in Seoul. Although each administrative district in Seoul might have distinct causes of coronavirus infection, there also exist common causes between administrative districts. The cause of this occurrence can be divided into small-scale infection and mass infection. In this study, we propose a model for predicting COVID-19 diffusion using the DARNN (Dual-Stage Attention-Based Recurrent Neural Network) technique that optimizes the variables related to various causes of infection. In the experiment using the time-series data of the number of confirmed cases, the correlations between administrative districts in respect to the confirmation patterns, and the floating populations in each administrative district, the proposed DARNN model outperformed the widely used LSTM (Long Short-Term Memory) model in terms of prediction accuracy.

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.

기획특집 : 낙농가라면 알아야 할 치즈제조 - 우리 우유를 활용한 간단한 홈메이드 치즈

이미경,Lee, Mi-Gyeong 한국낙농육우협회 2012 낙농·육우 Vol.32 No.8

RDF 스키마에서 UML 클래스 다이어그램으로의 변환

이미경,하얀,김용성,Lee, Mi-Kyung,Ha, Yan,Kim, Yong-Sung 한국정보처리학회 2000 정보처리논문지 Vol.7 No.1

인터넷 상의 문서가 많아지고 이에 대한 정확한 접근이 요구됨에 따라, 인터넷 자원에 대한 메타데이터를 표준화시키고, 메타베이스를 구축, 활용하는 것은 매우 중요하다. RDF(Resource Description Framework)는 구조화된 메타데이터를 표현하고, 교환하며 재사용하기 위한 기반 구조이며, 문법으로 XML을 이용하기 때문에 표준화된 메타데이터에 대한 일괄된 표현 및 교환, 처리가 가능하다. RDF 스키마는 RDF 모델에서 사용을 위해 제안한 기본 타입 시스템으로 본 논문에서는 XML로 된 RDF 스키마를 UML 클래스 다이어그램에 사상시키는 규칙과 알고리즘을 제안하고 이를 통해 객체 모델링하므로써 객체 지향 데이터베이스 스키마로의 변환을 용이하게 한다. 그리고, RDF 스키마에 대한 객체지향 스키마 형태인 형식 모델을 정의하여 객체지향 문서 처리와 검색을 위한 효율적인 환경을 제시할 것이다. With increasing amounts of information on the web and needs to access accurately them, it is very important to standardize metadata and to store and manage system. The RDF(Rdsource Description Framework) is a framework for representing exchanging, and reusing metadata. And, it can be processing uniformly the standardized metadata, because it uses XML(eXtensible Markup Language) syntax. The RDF schema provides a basic type system for use RDF models. In this paper, we propose rules and an algorithm to convert the RDF schema into an UML(Unified Modeling Language) class diagram and formal models to represent an object-oriented schema for the RDF schema. The proposed rules and algorithm are useful for natural mapping and the object modeling of RDF schema can be easily converted into the object-oriented schema, and the formal models supports an efficient environment for retrieving and processing object-oriented documents.

가정용 인공호흡기 적용 환자의 가정간호서비스 이용실태

이미경,송종례,오은경,윤영미,Lee, Mi Kyoung,Song, Chong Rye,Oh, Eun Kyung,Yoon, Young Mi 한국가정간호학회 2017 가정간호학회지 Vol.24 No.2

Purpose: The study aimed to describe the utilization of home healthcare in patients using home mechanical ventilator(HMV) Method: A descriptive cross-sectional design was used in this study. A Questionnaires were sent to nation wide home healthcare agencies to assess their utilization status of home healthcare. A convenience sample of 158 patients data was reviewed. Result: A total of 88(55.7%) men with the mean age of 51.94(${\pm}19.52$) years were included in the study. Approximately 55.1% of patients at the outpatient department were referred to the home healthcare services after discharge. The underlying diseases were as follows : 129 amyotrophic lateral sclerosis and 27 muscular dystrophies. A total of 155 patients have invasive HMV. Efficient home healthcare nursing activities provided by a highly skilled home healthcare advanced practice nurses(HHCAPN) were tracheotomy and gastrostomy tube management and urinary catheterization. The average frequency of home visit for one patient was 2.52times per month. The duration of home healthcare utilization with >1 year was 82.9%. HHCAPNs have limited knowledge and skill for HMV. Conclusion: The government support is required to provide sufficient home healthcare services to the patients discharged with HMV. HHCAPNs should be properly educated on the effective HMV care.