$SrTiO_3$계 세라믹에서 조성비와 입계 절연화제의 확산온도가 전기전도 특성에 미치는 영향

이상석,이석진,최태구,조희작,Lee, S.S.,Lee, S.J.,Choy, T.G.,Cho, H.J. 한국전자통신연구원 1993 전자통신동향분석 Vol.8 No.4

최근의 정보 통신 기기들은 정보 통신 서비스에 대한 요구에 따라 다기능, 고속 및 대용량화로 비약적인 발전을 하고 있으며 휴대 통신 단말기의 경우 이용자의 편리를 위하여 소형화 및 경박 단소화를 지향하고 있다. 따라서 부품에 대한 요구 사항도 이들 추세에 따라 소형화, 다기능화 및 고신뢰화를 요구하고 있다. 따라서, 하나의 소자로 복합적인 기능을 갖는 다기능성 소자의 개발이 바람직하다. $SrTiO_3$를 모체로 하는 세라믹 유전체는 반도체화 세라믹의 결정입계에 산화물로 절연층을 형성하여 하나의 소자로 Capacitor 와 Varistor 기능을 동시에 갖는 다기능 소자용 소재로 이용되고 있다. 본 실험에서는 $SrTiO_3$조성비 및 입계절연화제의 확산 온도에 따라 이들이 전기전도 특성에 미치는 영향에 대하여 검토하였다.

산지형 도시근린공원의 배수시설 특성 - 서울시 배봉산공원과 오금공원을 사례로 -

이상석,Lee, Sang-Suk 한국조경학회 2010 한국조경학회지 Vol.38 No.5

The purpose of this study was to analyze drainage facilities in mountainous urban neigbborhood parks--Baebongsan Park and Ogeum Park--in Seoul. Based on an analysis of existing drainage facilities, the volume of storm water runoff (VSW), the runoff rate of open channels(ROC), and the detention capacity of open charmels(DCOC) by each drainage watershed, the coefficient of runoff rate(CROC) as evaluated to be relevant between VSW and ROC and the coefficient of the detention capacity of open channe1s(CDCOC) as evaluated with DCOC compared to VSW were estimated and analyzed by parks and by watersheds. The results are as follows: 1. The total drainage area of Baebongsan Park was 34.13ha including surface runoff area(15.05ha; 44.09%), open channel area(l4.60ha; 42.78%), and natural waterway area(4.48ha; 13.13%). The total drainage area of Ogeum Park was 20.39ha including open channel area (10.14ha; 49.73%), ridge-side gutter area(7.17ha; 35.16%), surface runoff area (2.52ha; 12.36%), and natural waterway area (0.56ha; 2.75%). In Baebongsan Park, the portion of surface runoff was comparatively higher while the portion of artificial drainage area was higber in Ogeum Park. 2. In Baebongsan Park drainage districts were largely divided: VSW was $7.28m^3/s$ in total(average $0.23m^3/s$). Comparatively, tbe VSW in Ogeum Park, including smaller drainage districts, was $4.37m^3/s$ in total(average $0.12m^3/s$). 3. The ROC of Baebmgsan Park was $11.58m^3/s$ in total(average $0.77m^3/s$) and the CROC was 5.26, while in Ogeum Park, the ROC was $15.40m^3/s$(average $0.34m^3/s$) and tbe CROC was 8.87 higher than that of Baebongsan Because the size and slope of the open channel in Baebongsan Park was higher, the average ROC was larger, while tbe CROC of Ogeum Park was higher than that of Baebongsan Park, for the VSW in Ogeum Park was comparatively lower. 4. The DCOC in Baebongsan Park was $554.54m^3$ and the average of CDCOC was 179.83. That of Ogeum Park was $717.74m^3$ and the average of the CDCOC was 339.69, meaning that the DCOC of Ogeum Park was so much higber that drainage facilities in Ogeum Park were built intensively. This study was focused m the capacity of the drainage facilities in mountainous urban neighborhood parks by using the CROC to evaluate relevance between VSW and ROC and the CDCOC to evaluate the DCOC as compared with VSW. The devised methodology and coefficient for evaluating drainage facilities in mountainous urban neighborhood parks may he universally applicable through additional study. Further study m sustainable urban drainage systems for retaining rainwater in a reservoir and for enhancing ecological value is required in the near future.

듀플렉서의 최근 기술동향

이상석,박정래,전동석,이석진,이창화,김태홍,최태구,Lee, S.S.,Park, J.R.,Jun, D.S.,Lee, S.J.,Lee, C.H.,Kim, T.H.,Choy, T.G. 한국전자통신연구원 1995 전자통신동향분석 Vol.10 No.3

이동통신 기술은 수요의 증가에 따라 눈부신 발전을 계속하고 있다. 그중 에서도 단말기 및 기지국 시스템 사용의 간편성 및 휴대성을 고려한 소형화 추세는 계속 연구대상이 되고 있으며, 또한 이들을 구성하는 부품의 소형화, 고기능화 및 저가격화를 요구하고 있다. 본 고에서는 이와 같은 단말기와 기지국 시스템의 소형화 요구에 따라 송수신 신호를 분리하기 위하여 안테나 바로 밑단에 사용되는 듀플렉서의 기술동향에 대하여 정리하였다.

센서용 거대자기저항 스핀밸브소자의 열처리 효과

이상석,박상현,소광섭,주호완,김기왕,황도근,Lee, Sang-Suk,Park, Sang-Hyun,Soh, Kwang-Sup,Joo, Ho-Wan,Kim, Gi-Wang,Hwang, D.G. 한국자기학회 2007 한국자기학회지 Vol.17 No.4

In order to detect of the magnetic property in the cell unit, we studied the GMR-SV (giant magnetoresistance-spin valves) biosensor, which was depended on the micro patterned features according to two easy directions of longitudinal and transversal axes. Here, the multi layer structure was glass/NiO/NiFe/CoFe/Cu/CoFe/NiFe. The uniaxial anisotropy direction was applied to the patterned biosensor during the deposition and vacuum post-annealing at $200^{\circ}C$ under the magnitude of 300 Oe, respectively. Considering the magnetic shape anisotropy effect, the size of micro patterned biosensor was a $2{\times}5{\mu}m^2$ after the photo lithography process. By our experimental results, we confirmed that the best condition of GMR-SV biosensor should be the same direction of the axis sensing current and the easy axis of pinned NiO/NiFe/CoFe triple layer oriented to the width direction of device, and the direction of the easy axis of free CoFe/NiFe bilayer was according to the longitudinal direction of device.

$ZrO_2$-$TiO_2$ 세라믹의 $MoO_2$ 함유량과 소결온도가 유전특성에 미치는 영향

이상석,이석진,이창화,최태구,Lee, Sang-Seok,Lee, Seok-Jin,Lee, Chang-Hwa,Choe, Tae-Gu 한국전자통신연구원 1992 전자통신 Vol.14 No.4

불요 전자파 제거용 필터의 유전체로 사용되는 Zirconium Titanate 세라믹 유전체에서 $MoO_2$ 함유량과 소결온도에 변화를 주어 이들이 유전특성에 미치는 영향에 대하여 검토하였다. 일반적으로 $MoO_2$ 함유량보다는 소결온도의 변화가 유전률, 품질계수 및 소결밀도 등에 더 큰 영향을 주었으며, 정전용량의 온도계수 측면에서는 $MoO_2$ 함유량을 제어하여0ppm$^\{circ}C$근처로 이동시켜 상당히 안정된 온도 특성으로 개선할 수 있었다.

맥문동탕(麥門冬湯)이 $SO_2$에 의(依)한 흰쥐의 호흡기손상(呼吸器損傷)에 미치는 영향(影響)

이상석,정승기,이형구,Lee, Sang-Sek,Jung, Sung-Ki,Lee, Hyung-Koo 대한한의학회 1994 대한한의학회지 Vol.15 No.2

The results about effects of Maecmoondongtang on the pulmonary function of $SO_2$ exposed rats were summerized as follows: 1. Maecmoondongtang reavealed significant effect on decrease of the lung weight in pulmomary edema of rats. 2. Maecmoondongtang reavealed very significant effect on decrease of the TBA value of lung. 3. It was recognized Maecmoondongtang had signiftcant effect on decrease of glycoprotein contents in trachea. 4. It was recognized maecmoondongtang had significant effect on decrease of mucos area in tracheal epithelium. 5. Maecmoondongtang had effects on recovery of the cillia cells of tracheal epithelium and inhibition of mucous secretion. According to the above result. it was recognized Gamimaecdongtang had significant effect on decrease of lung weight in pulmonary edema. the TBA value. glycoprotein contents in trachea. and mucous area in tracheal epithelium. and recovery of the cillia cells of tracheal epithelium. and inhibition of mucous secretion. So I think we can take advantage of this medicine very usefully for treatment of pulmonary edema. pheumonia. acute and chronic bronchitis etc.

형상기억고분자의 응용

이상석,임상철,박찬우,정순원,나복순,오지영,구재본,추혜용,Lee, S.S.,Lim, S.C.,Park, C.W.,Jung, S.W.,Na, B.S.,Oh, J.Y.,Koo, J.B.,Chu, H.Y. 한국전자통신연구원 2013 전자통신동향분석 Vol.28 No.5

형상기억 물질은 임의의 형상을 유지하다 외부의 자극에 의하여 원래의 형상으로 회복되는 물질이다. 이와 같은 형상기억 물질은 형상기억합금과 형상기억고분자로 대별되며, 형상기억효과를 응용하려는 용도 및 특성에 따라 선택되어 사용되고 있다. 본고에서는 형상기억합금과 형상기억고분자의 특성 및 원리에 대해 정리하였으며, 형상기억합금에 비해 가볍고 저렴하며 외부 자극의 종류도 다양하게 선택할 수 있는 형상기억고분자의 용도를 정리하였다. 향후 형상기억고분자는 wearable 디스플레이, 태양광 패널 및 비침습성 의학소자 등 그 용도가 다양할 것으로 전망된다.

스트레처블 디스플레이 기술

이상석,정순원,박찬우,나복순,오지영,구재본,추혜용,Lee, S.S.,Jung, S.W.,Park, C.W.,Na, B.S.,Oh, J.Y.,Koo, J.B.,Chu, H.Y. 한국전자통신연구원 2014 전자통신동향분석 Vol.29 No.6

최근 사물인터넷 통신이 화두로 대두되고 있으며, 웨어러블 디바이스가 핵심기기중의 하나가 되고 있다. 본고에서는 스트레처블 디스플레이의 관점에서 웨어러블 기기, 의료기기 및 터치기술과의 융합 가능성에 대하여 정리하였다. 또한, 스트레처블 디스플레이를 구현하기 위한 기술은 아직은 기초 연구단계의 연구개발이 진행되고 있으며, 기판과 전극 재질의 입장에서 최근 기술들을 정리하였다. 향후 스트레처블 디스플레이가 구현된다면 그 시장 및 응용성은 급속히 확대될 것으로 전망된다.

한국전쟁 메모리얼의 설계요소에 나타난 기념성

이상석,Lee, Sang-Suk 한국조경학회 2010 한국조경학회지 Vol.38 No.1

The purpose of this study was to analyze design characteristics of Korean War Memorials(KWM) in the United States(KWMUS). Through site survey and internet searching, the researcher selected 25 KWMUS and analyzed four analysis categories: design concept, spatial form, landscape details, and sculptures. The results are as follows: 1. The analysis revealed that main concepts of KWMUS were to cherish victims of the Korean War, show membership/locality/patriotism, express feelings and the meaning of war, and explain the Korean War realistically and symbolically. 2. Most KWMUS in memorial parks and plazas were designed to pursue the completion of each memorial assuming the form of typical and symmetrical circles and squares. Also, spatial order including spatial sequence was seen in some of KWMUS. 3. Stone walls, stone monument, flags, emblems and paving were used as main landscape details. The map of the Korean peninsula and Taegeuk were often introduced to symbolize Korea and the Korean War, and the symbolic phrase, 'Forgotten War' or 'Freedom is Not Free' were written on the stone to keep the Korean War in the minds of Americans. 4. Sculptures were used as important media to represent the Korean War in a variety of ways. Most of them were formed realistically, except for a few sculptures that aimed to represent the Korean War symbolically and narratively. In particular, the sculptures in Washington D.C. KWVM and Minnesota KWM were remarkable as symbolic media of war memorials in contemporary society. Further study will be required to analyze comparatively KWM in Korea and the U.S. and to understand characteristics of KWM in the point of design style.

반추위 미생물에 미치는 생균제의 역할

이상석,Lee, Sang-Seok 한국종축개량협회 2007 種畜改良 Vol.12 No.8