폴리비닐피롤리돈이 코팅된 마하젠더 간섭계 기반의 평판형 광도파로 습도센서

김주하,김명진,정은주,황성환,이우진,최은서,노병섭,Kim, Ju Ha,Kim, Myoung Jin,Jung, Eun Joo,Hwang, Sung Hwan,Lee, Woo Jin,Choi, Eun Seo,Rho, Byung Sup 한국광학회 2013 한국광학회지 Vol.24 No.5

In this paper, the characteristics of a humidity sensor implemented by Mach Zehnder Interferometer (MZI) in a Planar Lightwave Circuit (PLC) have been designed and demonstrated. The humidity outside is detected with polyvinylpyrrolidone (PVP) coated on the etched arm of the MZI. The length of the etched arm is 10 mm and the PVP was coated by dip-coating into the etched region. As the refractive index of the PVP changes with the surrounding humidity, the PVP-coated humidity sensor presented changes in the interferogram depending on RH (Relative Humidity) around the PLC. The measured results show that the proposed humidity sensor works successfully in the range of 30% to 80% of RH. 본 논문에서는 평판형 광도파로 상에 마하젠더 간섭계를 형성한 습도센서의 특성을 제시하고자 한다. 평판형 광도파로의 마하젠더 간섭계의 한쪽 팔에 PVP를 코팅함으로써 센서 주변의 외부 습도를 측정하였다. 습도를 계측할 간섭계의 한쪽 팔은 10 mm 폭으로 에칭하고, 에칭된 곳에 폴리비닐피롤리돈 (PVP)를 코팅하였다. PVP는 습도변화에 의해서 굴절률의 변화가 일어나므로, PVP로 코팅된 습도 센서는 평판형 광도파로 근처 상대습도의 차이에 따라 광간섭무늬의 변화를 나타내었다. 이에 대한 측정 결과를 통해 30%~80% 상대습도 범위에서 습도센서로써 작동함을 확인할 수 있었다.

CMOS 이미지 센서를 위한 고효율 Charge Pump

김주하(Ju-Ha Kim),전영현(Young-Hyun Jun),공배선(Bai-Sun Kong) 대한전자공학회 2008 電子工學會論文誌-SD (Semiconductor and devices) Vol.45 No.5

본 논문에서는 CMOS image sensor(CIS)에서 사용될 수 있는 고 효율 charge pump를 제안하였다. 제안된 charge pump는 CIS의 동작 특성을 활용하여 switching loss 및 reversion loss를 최소화하여 고 효율 동작을 실현하였다. 즉, CIS 픽셀 동작구간에 따라 local clock driver, 펌핑 커패시터, 그리고 charge 전달 switch의 크기를 역동적으로 조절함으로써 switching loss를 최소화하였다. 또한, schmitt trigger를 채용한 tri-state local clock driver를 이용하여 non-overlapping 구간이 충분히 확보된 local clock을 공급할 수 있게 함으로써 reversion loss를 최소화하였다. 0.13-㎛ CMOS 공정을 이용한 시뮬레이션 비교 결과, 제안된 charge pump는 구동 전류가 없는 조건에서 기존 구조에 비해 최대 49.1% 전력 소모를 개선하였으며, 구동 전류가 최대인 조건에서는 19.0% 전력 소모를 개선할 수 있었음을 확인하였다. In this paper, a high-efficiency charge pump for use in CMOS image sensor(CIS) is proposed. The proposed charge pump pursues high pumping efficiency by minimizing the switching and reversion losses by taking advantage of operation characteristics of CIS. That is, the proposed charge pump minimizes the switching loss by dynamically controlling the size of clock driver, pumping capacitor, and charge transfer switch based on the operation phase of CIS pixel sensor. The charge pump also minimizes the reversion loss by guaranteeing a sufficient non-overlapping period of local clocks using a tri-state local clock driver adapting the schmitt trigger. Comparison results using a 0.13-㎛ CMOS process technology indicate that the proposed charge pump achieves up to 49.1% reduction on power consumption under no loading current condition as compared to conventional charge pump. They also indicate that the charge pump provides 19.0% reduction on power consumption under the maximum loading current condition.

국제올림픽위원회 위원들의 사회연결망 분석

김주하 ( Kim Ju-ha ),김승재 ( Kim Seung-jae ),서상훈 ( Suh Sang-hoon ) 한국체육학회 2019 한국체육학회지 Vol.58 No.6

본 연구의 목적은 ‘사회 연결망 분석(Social Network Analysis)’을 이용하여 밝혀낸 IOC 위원들의 네트워크 구조를 인구통계학적 특성과 함께 분석하여 최근 IOC 조직이 지니는 특성과 그 위원들의 연결망 내 핵심 위원이 가지고 있는 자질을 파악하는 것이다. 먼저 위원들의 네트워크 분석은 고등 교육 학과 및 IOC 내 분과 이력을 중심으로 넷 마이너(Net-miner) 4.0을 활용해 사회연결망 분석(Social Network Analysis)을 진행하였다. 이후 사회 연결망 분석 결과를 인구통계학적 특성과 연관 지었다. 이를 통해 도출한 결과는 총 세 가지이다. 1) IOC 내에서 형성된 연결망 내에서 고등 교육 이력은 큰 의미를 갖지 않는다, 2) IOC 내에서 핵심적인 영향력을 행사하는 인물에게 중요한 것은 임명된 년도가 아닌 최근 분과 활동에 대한 활발한 참여도이다, 3) 네트워크 속 여성 위원들의 영향력이 커짐에 따라 미래의 IOC에서는 남성과 여성의 비율이 훨씬 균등해질 것이다. 이러한 연구의 결론을 통해 국제 스포츠 기구에 걸맞은 인재상을 도출해 낼 수 있으며, 이는 향후 우리나라에서 세계적인 영향력을 가지는 스포츠 인재의 전략적인 배출을 돕는 자료로 활용될 수 있다. The purpose of this study is to figure out the characteristics of recent IOC members and the qualification of the key IOC member by analysing the network structure of the IOC members, which was figured out by using ‘Social Network Analysis’, together with demographical characteristics of the committee members. Fristly, the analysis of the members’ network was conducted based on their education and subcommittee experiences in IOC by utilizing Net-miner 4.0. Then the results of network was related with overall demographical characteristics of members. The results from this study indicates. 1) Education doesn’t have meaningful impact within the network built in IOC. 2) The active participation of subcommittee experiences is the key for members to exert core effect in IOC, not the year of being appointed. 3) In the future IOC, the percentage of men and women would become more equal. In conclusion, we can figure out the ideal qualifications to be the powerful person in the international sports organization. Moreover, this can make us be able to cultivate future leaders in sports more strategically.

자연소재를 활용한 안티폴루션 화장품에 대한 국내 연구 동향 고찰

김주하(Ju ha Kim) 케이뷰티인학회 2022 케이뷰티인학회지 Vol.2 No.1

미세먼지는 유해물질을 포함하고 있어 피부 손상을 일으키는 대기 중 먼지이다. 본 연구에서는 안티폴루션 화장품 연구 동향을 살펴봄으로써 향후 다양한 자연소재를 활용한 안티폴루션 화장품 소재 개발에 기초자료를 제공하고자 한다. 자료 수집을 위해 2015년부터 2021년까지 발표된 논문을 대상으로 RISS, NSDL, KISS 및 DBPIA을 이용하여 검색하였다. 주요 키워드는 ‘추출물’과 ‘안티폴루션’이며, 분석결과는 다음과 같다. 지모추출물, 베타글루칸, 폴리감마글루탐산 추출물의 경우 세포 생존율과 세포독성에서 효과적인 효능을 지니고, 미세먼지 자극에 의한 항산화력, 활성산소종 억제 효과에서도 유의적인 효과를 지니고 있으며, 피부 각질, 피부 수분량, 피부 가려움증 또한 3종 혼합물에 의해 개선되었다. 녹차뿌리 추출물은 인삼 추출물보다 많은 사포닌을 함유하고 있어 자연 계면 활성제로 사용될 수 있으며, 미세먼지에 의해 유발되는 NHEK Cells의 손상에 대한 보호 효과가 있음을 확인하였다. 님트리잎 에탄올추출물은 HaCaT cell과 CCD cell에 대하여 항염 및 항산화, 주름, 미백, 세포보호 효과를 나타내었다. 개서어나무 추출물과 드렁방동사니의 알데히드 화합물은 HaCaT cell에서 Diesel particulate extract에 대한 세포 생존율과 항알레르기 효능을 보였다. 톳 에탄올추출물은 미세먼지에 노출된 피부각질형성세포에서 피부염증을 효과적으로 억제함을 확인하였다. 이상의 결과를 종합하여 보았을 때, 안티폴루션 화장품은 피부 개선에 도움을 줄 수 있으며, 자연소재를 다각화하여 안전성과 안정성이 확보된 안티폴루션 화장품 개발이 지속적으로 이루어져야할 것이다. Particulate matter is airborne dust that contains harmful substances and causes skin damage. In the study, This review was performed to provide basic data on anti-pollution cosmetics natural material. We searched several literatures, researches using key words of ‘Natural material’, ‘Anti-pollution’ in RISS, NDSL, KISS and DBPIA then reviewed. Anemarrhena asphodeloides root extract, β-glucan and poly-γ-glutamic acid (the complex) is effective in cell viability and cytotoxicity. It also has the anti-oxidant and reactive oxygen species (ROS) inhibitory effect. Skin exfoliation, skin moisture, and itching have also been improved. Green tea root extract contains more saponin than ginseng extract, so it can be used as a natural surfactant, and it has been confirmed that it has a protective effect against damage to NHEK Cells caused by Particulate matter. Neem tree 70% ethanol extract showed anti-inflammatory, anti-oxidant, wrinkle, whitening and cell protection effects for HaCaT cells and CCD cells. The Carpinus Tschonoskii MAX (CTM) extract and Aldehyde compound of Cyperus Globosus (CG) showed cell viability and anti-allergic efficacy against Diesel partition extract in HaCaT cell. It was confirmed that the Sea weed fusiforme ethanol extract effectively suppresses skin inflammation in skin keratinogenic cells exposed to fine dust. Anti-pollution Cosmetics can help improve your skin. The development of anti-pollution cosmetics with safety and stability by diversifying natural materials will have to be researched continuously.

대학생의 행동유형과 외모에 대한 사회문화적 태도가 피부미용 관심도에 미치는 영향

김주하 ( Ju Ha Kim ),강지웅 ( Ji Woong Kang ),한삼성 ( Sam Sung Han ) 대한미용학회(구 대한미용과학회) 2018 대한미용학회지 Vol.14 No.3

We analyzed behavioral patterns of college students and how sociocultural attitudes relating to appearance impact their interest in skin care. Surveys of college students attending Gyeongbuk and Busan Universities were conducted from May 15th to June 23rd, 2017; a total of 461 responses were included in the final analysis. Multiple regression analyses reveal an increase in skin-care interests in students with a higher sociocultural attitude to appearance in Models 1, 2 and 3. In an analysis specific to behavioral patterns, Model 1 revealed that students classified as “Influence” Type were more interested in skin care compared with those classified as “Steadiness” Type. Model 2 revealed that “Influence” and “Conscientiousness” Type students displayed an increased attraction to skin care compared with “Steadiness” Type students. Lastly, in Model 3, students classified as “Conscientiousness” Type revealed a superior interest in skin care compared with “Steadiness” Type students. Thus, sociocultural attitudes relating to appearance among college students are crucial factors impacting interest in skin care. For aesthetic services targeting college students, it seems essential to take relevant school and socioeconomic characteristics into account.

광섬유 패치코드를 이용한 Fabry-Perot 간섭계 온도센서

김주하 ( Ju Ha Kim ),정은주 ( Eun Joo Jung ),김명진 ( Myoung Jin Kum ),김계원 ( Gye Won Kim ),노병섭 ( Byung Sup Rho ),최은서 ( Choi Eun Seo ),황성환 ( Hwang Sung Hwan ),이우진 ( Lee Byung Ing Go ),안종배 ( Jong Bae An ) 한국센서학회 2014 센서학회지 Vol.23 No.2

In this paper, we propose and demonstrate a Fabry-Perot interferometer (FPI) optical fiber tip sensor fabricated by a blade-sawing technique using a fiber optic patch cord for high-resolution temperature measurement. The sensor head consists of a short air FP cavity near the tip of a single-mode fiber patch cord tip. The temperature which we can measure is determined through a phase variation of the interference fringes in the reflective spectrum of the sensor. The fiber optic FPI sensor in this work can monitor the environmental temperature very accurately from 40 to 120oC. As a result, the temperature sensitivity is obtained as 38.2 pm/oC.

D.H. Lawrence의 여성인물연구

김주하 원광대학교 2006 論文集 Vol.36 No.-

This thesis aims to analyze Lawrence's female character of The Plumed Serpent. Lawrence's view of woman is very important for him. Lawrence is called as an anti-feministic writer or a feministic writer according to his view toward woman. When we devide Lawrence's literary history as four periods, he is a feministic writer except the third period. Lawrence became anti-feminist in the third period. In the third period, he turns his viewpoint into Anti-feminist in relation to two-sexs after the first World War. In his works, he has authority of Men; Women's obedience to the Men who has strong authority and leadership. In The Plumed Serpent, Kate who married to Cipriano gives up her self and submitts to the phallic power of Cipriano. At the end of The Plumed Serpent, Kate appeals Cipriano to let her stay at him. The result is the culmination of anti-feminism. Kate gives up her self completely and submitts to the strong phallic power of man. Lawrence's man superiority is exposed through this process. In The Plumed Serpent, when the man is active and dominative and the woman is submissive and dependent, the balance between man and woman is achieved. Lawrence strongly expresses his anti-feministic point of view that the man must display the strong leadership to revive the power and the right of man that is lost owing to the war and the woman must give up the self and the independence and submitts to the strong man leader. Lawrence became anti-feminist after the first world war. The reason why he became anti-feminist from feminist is as follows: the first is that Lawrence has the antipathy against the movement of woman's right that emphasize excessively the emancipation of woman, the second is the ever-increasing participation of woman into society after the first world war, the third is the fear of woman who is independent and has the strong personality owing to the discord with Frieda.