Y₂O₃-카본 복합체의 전기전도성에 미치는 소결온도의 영향

최관영,오윤석,김성원,김형순,박종훈,이성민,Choi, Kwan-Young,Oh, Yoon-Suk,Kim, Sung-Won,Kim, Hyung-Sun,Park, Chong-Hun,Lee, Sung-Min 한국세라믹학회 2012 한국세라믹학회지 Vol.49 No.2

The $Y_2O_3$ ceramics have been widely used as plasma resistant materials in the semiconductor industry. In this study, composites made of plasma resistant $Y_2O_3$ and electrically conductive carbon have been produced. The electrical properties of this composite were measured with respect to the size, volume fraction of the conductive carbon phase, and sintering temperature. When micro-sized carbon was used, the composites were insulating up to 5 wt% addition of the carbon. However, when nano-sized carbon of around 60 ~100 nm was used, the composites became conductive over threshold volume fraction of carbon, which increased with increasing sintering temperature. This behavior of electrical conductivity of the composites was discussed in terms of the percolation theory. The percolation threshold of the conductivity seemed to be affected by the grain growth and coalescences of dispersed conductive carbon phases with grain growth of matrix $Y_2O_3$.

적외선 화상처리 장치를 이용한 건조초기 목재 표면 온도 측정

이관영,강호양,이민경,Lee, Kwan-Young,Kang, Ho-Yang,Lee, Min-Kyung 한국가구학회 2006 한국가구학회지 Vol.17 No.3

Temperature of board surface was monitored during drying using an IR image measurement system. Boards were water-saturated and dried at the levels of four temperatures and three air velocities. At higher DB the surface temperature increased more steeply and level off period was significantly short. At the DB temperatures of 70, 80, $90^{\circ}C$ the period where the surface temperature was equivalent to WB temperature was constant regardless of air velocity while at $60^{\circ}C$ it decreased as air velocity increased. It was confirmed that a surface transfer coefficient increased with DB temperature. Variation of temperature profile on a wood surface increased with DB temperature and air velocity.

쌍태임신에서 임신 제2삼분기에 시행된 맞춤형 선택적 유산에 관한 연구

오관영 ( Kwan Young Oh ),이병관 ( Byung Kwan Lee ),김영주 ( Young Ju Kim ),안정자 ( Jung Ja Ahn ),김종일 ( Chong Il Kim ),전선희 ( Sun Hee Chun ),이수윤 ( Soo Yoon Lee ),박미혜 ( Mi Hye Park ) 대한산부인과학회 2007 Obstetrics & Gynecology Science Vol.50 No.12

목적: 최근 생식 보조술의 증가로 고령 임신 및 다태 임신이 늘어나면서 다태 임신 중 이상 태아가 발견되는 확률이 늘어나고 있다. 임신 2삼분기에 발견되는 태아 이상에 대한 선택적 유산술에 대해 알아보고자 하였다. 연구방법: 1998년 3월부터 2006년 3월까지 이대 목동 병원 및 을지 대학 병원에서 일측 태아의 기형을 동반한 쌍태임신 6예를 대상으로 임신 중반기 선택적 유산을 시행하였다. 이 연구는 여섯 예의 선택적 유산에 대하여 후향적으로 실시되었고, 선택적 유산의 적응증으로는 3예의 구조적 기형 (anencephaly, encephalocele, body stalk anomaly), 1예의 염색체 이상 (21 trisomy) 및 2예의 단일 융모막성 쌍태 임신의 합병증 (acardiac twin, twin to twin transfusion syndrome)이 있었다. 결과: 시술은 각기 융모막성을 고려하여 이중융모막을 가진 4예에서는 KCL injection, 단일 융모막성을 가진 2예에서 각각 alcohol ablation, radiofrequency cord ablation을 시행하였으며 6예 모두에서 시술이 성공적으로 이루어졌고 태아는 모두 제3삼분기에 분만하였다. 결론: 임신 중반기 선택적 유산에 있어 융모막성을 고려하여 적절한 유산 방법을 선택하는 것은 임신 유지 및 나아가 태아와 산모의 예후에 좋은 영향을 미칠 것이다. Objective: Recently, selective termination is employed in multifetal pregnancies, in the presence of an abnormal fetus, or in the complication of twin pregnancies. The purpose of this study is to evaluate effectiveness, safety of the tailored selective termination in multifetal pregnancies. Methods: This study was retrospective and involved six cases. Indication of termination were 3 cases of structural anomalies (anencephaly, encephalocele, body stalk anomaly), 1 case of chromosomal anomaly (21 trisomy) and 2 cases of monochorionic twin complications (acardiac twin, twin to twin transfusion syndrome). Results: We used KCL injection in 4 cases, they were all confirmed dichorionic twin, and in 2 cases of monochorionic twin, we used alcohol ablation of intra-abdominal umbilical artery in 1 case, and radiofrequency ablation of the cord in 1 case. Conclusion: All procedures were successful, and all normal infants were delivered in 3rd trimester. Tailored selective termination in 2nd trimester is effective and safe in abnormal multifetal pregnancies.

연구논문 - 무기 / 촉매 : Mo 촉매에 의한 Cyclopropane 의 반응

이관영 ( Kwan Young Lee ) 한국공업화학회 1996 한국공업화학회 연구논문 초록집 Vol.1994 No.1

중국의 건축사제도와 외국건축사에 대한 자격인정(증) 방법

이관영,Lee, Kwan-Young 대한건축사협회 1998 建築士 Vol.1998 No.6

수정된 CS 기법을 통한 향상된 영상융합 알고리즘

오관영(Oh, Kwan Young),정형섭(Jung, Hyung Sup),이하성(Lee, Ha-Seong) 한국측량학회 2014 한국측량학회 학술대회자료집 Vol.2014 No.4

본 논문에서는 널리 사용되고 있는 Component-Substitution 기반의 영상융합 기법을 보완한 보다 효과적인 영상융합 기법을 제안하였다. 제안된 방법은 크게 두 가지 단계로 구분할 수 있다. 첫 번째는 가중 평균된 다분광 영상을 이용한 Intensity 영상의 제작 단계, 두 번째는 최적화된 융합 계수를 통한 고주파 component의 생성 단계이다. 본 알고리즘의 평가를 위해서 KOMPSAT-3 위성영상에 알고리즘을 적용하였고, 기존의 영상융합 알고리즘에 비하여 공간적/분광적인 측면에서 모두 향상된 결과를 나타냄을 확인할 수 있었다. we propose the image fusion method compensated to create high resolution MS image more advanced and enhanced. The proposed method is based on the well-established component substitution (CS) approach. Our method is organized into two parts. The first step is the construction of the intensity image as the weighted average of the MS image. The next step is to produce the weighted high-frequency component, acquired by product of the optimal parameter and high-frequency component. The proposed method is applied to the KOMPSAT-3 satellite. The qualitative and quantitative results showed that proposed method can improve the spectral/spatial quality compared with the previous fusion algorithms.

KOMPSAT-2 전정색영상과 다중분광영상의 융합기법 비교평가

오관영 ( Kwan Young Oh ),정형섭 ( Hyung Sup Jung ),이광재 ( Kwang Jae Lee ) 대한원격탐사학회 2012 大韓遠隔探査學會誌 Vol.28 No.1

본 연구의 목적은 KOMPSAT-2 위성영상에 가장 일반적으로 적용 가능한 영상융합기법을 제시하는 것이다. 가장 널리 사용되는 영상융합기법인 HPF, modified IHS, pan-sharpened, wavelet을 지역적, 계절적 특성이 서로 다른 4장의 KOMPSAT-2 위성영상에 적용하였고, 각각의 융합결과를 공간적, 분광적으로 비교분석 하였다. 영상융합기법의 품질평가는 시각적 분석과 정량적 분석을 병행하여 수행하였으며, 정량적 분석에는 spatial ERGAS, spectral ERGAS, SAM, Q4가 사용되었다. 종합적인 분석결과를 고려할 때, pan-sharpened가 색상정보와 공간정보의 균형적인 보존 측면에서 다른 융합기법들에 비해, 상대적으로 우수한 결과를 나타냈다. modified-IHS의 경우, 공간정보는 잘 보존하였지만 다소 큰 색상 왜곡이 발생되었고, HPF와 wavelet은 색상 왜곡은 적었지만, 공간정보의 왜곡이 발생하였다. The objective of this study is to propose efficient data fusion techniques feasible to the KOMPSAT-2 satellite images. The most widely used image fusion techniques, which are the high-pass filter (HPF), the intensity-hue-saturation-based (modified IHS), the pan-sharpened, and the wavelet-based methods, was applied to four KOMPSAT - 2 satellite images having different regional and seasonal characteristics. Each fusion result was compared and analyzed in spatial and spectral features, respectively. Quality evaluation of image fusion techniques was performed in both quantitative and visual analysis. The quantitative analysis methods used for this study were the relative global dimensional error (spatial and spectral ERGAS), the spectral angle mapper index (SAM), and the image quality index (Q4). The results of quantitative and visual analysis indicate that the pan-sharpened method among the fusion methods used for this study relatively has the suitable balance between spectral and spatial information. In the case of the modified IHS method, the spatial information is well preserved, while the spectral information is distorted. And also the HPF and wavelet methods do not preserve the spectral information but the spatial information.

SBR에서 발효 음식물 쓰레기가 낮은 C/N 비 하수의 생물학적 영양염류 제어에 미치는 영향

이관영(Kwan Young Lee),류홍덕(Hong Duck Ryu),이원호(Won Ho Lee),이상일(Sang Ill Lee) 大韓環境工學會 2002 대한환경공학회지 Vol.24 No.2

소프트웨어 ILS 적용방안 연구

이관영(Lee, Kwan-Young),김상문(Kim, Sang-Moon),박은심(Park, Eun-Shim),박재은(Park, Jae-Eun),김근형(Kim, Geun-Hyung) 한국산학기술학회 2014 한국산학기술학회논문지 Vol.15 No.9

무기체계에서의 소프트웨어에 대한 비중이 커짐에 따라, 소프트웨어 ILS(Integrated Logistics Support)에 대한 관심 이 커지고 있다. 그러나 기존 무기체계에서 ILS 개발은 하드웨어 중심으로 적용하고 있어 소프트웨어에 그대로 적용하기 힘든 실정이다. 본 논문은 소프트웨어 ILS의 실무 적용 어려움이 무엇인지 원인을 파악하고 문제점을 분석하기 위해 국내/외 규정 및 사례들을 통해 현 실태를 파악하였다. 또한, 소프트웨어의 유지보수 특성을 고려하여 소프트웨어와 하드웨어 ILS의 차이점을 검토하고, 소프트웨어 ILS 요소개발 범위 설정을 통해 국내에 적용이 가능한 소프트웨어 ILS 개발방안을 제안하였 다. 이는 소프트웨어 ILS 개발을 위한 구체적인 실무 적용방안을 수립하는 데 도움이 될 것으로 기대한다. The increasing importance of software has highlighted the need for the proper application of software ILS. On the other hand, the development of ILS has been somewhat limited to the area of hardware development. Therefore, this study examined the potential difficulties in applying software ILS to practical uses, and analyzed the drawbacks by reporting several domestic or foreign regulation cases. In addition, the differences between hardware and software ILS were examined by considering their characteristics of maintenance. Eventually, by establishing the proper range, this study proposes a development plan that is suitable for domestic weapon systems. The proposed research is expected to be helpful for offering specific plans for designing software ILS.

오존을 이용한 수조속의 오염물질 제거특성에 관한 실험적 연구

이관영(Kwan-young Lee),안승섭(Seung-seop Ahn),박상현(Sang-hyun Park) 한국산업융합학회 2002 한국산업융합학회 논문집 Vol.5 No.1

In this study, the initial number of bacteria before ozone sterilizing shows 290 per 1 ㎖ in HUN 1 and HUN 2 equally, but the removal rate shows more than 50% in HUN 1, and 100% in HUN 2 respectively when ozone injection amount is 0.28㎎/ℓ. It is regarded as a satisfactory result that E-coli concentration without ozone contact is 890, rapid removal effect of E-coli is observed in 0.28㎎/ℓ of ozone, and E-coli is removed perfectly in 0.84㎎/ℓ of ozone. It is thought that an excellent efficiency is obtained for vibrio alginolyticus because the initial number of bacteria before ozone contact is positive, but it is altered to negative after ozone contact. CODcr shows the tendency which is somewhat reduced as the ozone injection is increased, but the general effect is appeared not so much, and it is thought that the tendency is caused by the reason that sea water contains much salt which is estimated as a component of CODcr, therefore it is regarded that ozone contact has not an important effect on salinity. It is thought that the frequency of changing salt water in the fish preserve of a sliced raw fish restaurant can be reduced to under the standard because NTU of 7 days after sea water injection is 0.70 in the experiment of turbidity, hut more than 50% of turbidity removal efficiency is appeared at 0.28 ㎎/ℓ of ozone injection, and it shows 70% at 0.84 ㎎/ℓ of ozone injection in RUN 1 and HUN 2 commonly.<br/> <br/>