결절성 양진

오대현,김재홍 한국의학사 2004 診斷과治療 Vol.24 No.1

ICP - CVD 방법에 의한 TiN Diffusion Barrier Thin Film형성

오대현,강민성,오경숙,양창실,양두훈,이유성,이광만,변종철,최치규,김건호 한국진공학회 1999 한국진공학회 학술발표회초록집 Vol.- No.-

매독

오대현,김재홍 한국의학사 2004 診斷과治療 Vol.24 No.1

Effects of Human Activities on Home Range Size and Habitat use of the Tsushima leopard Cat Prionailurus bengalensis euptilurus in a Suburban Area on the Tsushima Islands, Japan

오대현,Shusaku Moteki,Masako Izawa 한국생태학회 2010 Journal of Ecology and Environment Vol.33 No.1

The Tsushima leopard cat, Prionailurus bengalensis euptilurus, a small felid, inhabits only the Tsushima Islands in Japan. Previous studies of the Tsushima leopard cat revealed that natural factors; including sex, reproductive activity,season, and prey distribution and abundance affect leopard cat home range variation and habitat use. In this study, we focused on clarifying how anthropogenic factors influenced home range variation and habitat use of a male Tsushima leopard cat living near a suburban area in January, March, May and September 2005 using radio-tracking. The home range size (100% MCP) of this cat was 0.78 ± 0.26 ㎢ (mean ± SD, n = 4 tracking sessions) across the whole study period. However, the cat did not use all parts of its home range uniformly; rather it used some habitat types selectively. The cat avoided agriculture areas and residential areas in all of the tracking-sessions. On the other hand, the cat showed a weak preference for artificial structures and a strong preference for baiting sites in January and March, while it avoided them in May, and no baiting site was included in its home range in September. These results suggest that anthropogenic factors influenced the ranging patterns and habitat use of the leopard cat living near a suburban area. Artificial structures might provided good resting spaces for the cat in bad weather. When the density of its main prey was low in the winter, the cat tended to rely on artificial prey and had a small home range size.

고밀도 플라즈마 CVD 방법에 의한 TiN barrier metal 형성과 특성

오대현,강민성,오경숙,이광만,변종철,황찬용,손정원,최치규 한국진공학회 1999 한국진공학회 학술발표회초록집 Vol.- No.-

Satellite-based In-situ Monitoring of Space Weather: KSEM Mission and Data Application

오대현,김지영,이혜숙,장근일 한국우주과학회 2018 Journal of Astronomy and Space Sciences Vol.35 No.3

Many recent satellites have mission periods longer than 10 years; thus, satellite-based local space weather monitoring is becoming more important than ever. This article describes the instruments and data applications of the Korea Space wEather Monitor (KSEM), which is a space weather payload of the GeoKompsat-2A (GK-2A) geostationary satellite. The KSEM payload consists of energetic particle detectors, magnetometers, and a satellite charging monitor. KSEM will provide accurate measurements of the energetic particle flux and three-axis magnetic field, which are the most essential elements of space weather events, and use sensors and external data such as GOES and DSCOVR to provide five essential space weather products. The longitude of GK-2A is 128.2° E, while those of the GOES satellite series are 75° W and 135° W. Multi-satellite measurements of a wide distribution of geostationary equatorial orbits by KSEM/GK-2A and other satellites will enable the development, improvement, and verification of new space weather forecasting models. KSEM employs a service-oriented magnetometer designed by ESA to reduce magnetic noise from the satellite in real time with a very short boom (1 m), which demonstrates that a satellite-based magnetometer can be made simpler and more convenient without losing any performance.

Anaplasma sp. and hemoplasma infection in leopard cats (Prionailurus bengalensis euptilurus) from Korea

황주선,오대현,이항,천명선 대한수의학회 2015 Journal of Veterinary Science Vol.16 No.3

This study examined the occurrence of Anaplasma spp. and hemoplasma infection in leopard cats, Prionailurus bengalensis euptilurus, inKorea. Twenty-nine biological samples were tested by molecular analysis. Two (6.9%) and eight (27.6%) tested specimens were positive forAnaplasma bovis and hemoplasma infection, respectively. Based on our results, Anaplasma/Ehrlichia spp. and hemoplasma are regularlyinfecting leopard cat populations of Korea. Considering their endangered status, regular monitoring of infection by arthropod-borne pathogensknown to cause clinical symptoms in feline hosts such as Anaplasma/Ehrlichia spp. and hemoplasma would be crucial as part of ongoingconservation efforts.

공간구문론을 이용한 도시 내 삵 이동통로 적지선정

박종준,우동걸,오대현,박종화,Park, Jong-Jun,Woo, Dong-Geol,Oh, Dae-Hyun,Park, Chong-Hwa 한국조경학회 2012 韓國造景學會誌 Vol.40 No.1

도시 지역의 야생동물 서식처는 급격한 도시화와 산업화 과정에서 파괴되거나 파편화되었다. 도시지역에 서식하는 야생동물의 로드킬을 저감하기 위해 파편화된 서식처의 연결이 필요하다. 도시지역의 인공장애물을 안전하게 통과하기 위해서는 야생동물의 행동에 기반한 야생동물 이동통로의 위치가 선정되어야 한다. 본 연구에서는 강서습지생태공원에서 서식하는 멸종위기종인 삵을 목표종으로 하여 야생동물 이동통로의 잠재적 대상지를 파악하였다. 이동통로의 선정은 공간구조를 객관적으로 평가하는 방법인 공간구문론 분석을 통해 이루어졌다. 통합도가 높은 것이 공간의 접근성과 연결성 높은 것을 의미하며, 이 논문에서는 통합도가 높은 공간이 삵이 더 자주 이동하는 공간을 의미한다. 포획된 삵은 발신기를 부착하여 2009년 3월부터 6월까지 4개월간 월 72시간 연속으로 원격무선추적하였다. 삵의 이동경로를 분석하기 위해 ArcGIS의 Animal Movenent와 Hawth Tools를 이용하였고, 공간구문론 분석을 위해 Axwoman 4.0을 사용하였다. 삵의 하루 평균이동거리는 $2.099{\pm}1.08km$로 나타났다. 연구기간 동안 삵은 로드킬의 위험을 안고 올림픽대로를 20회 이상 횡단하였다. 삵의 이동경로에 대한 공간통합도로서 전체 통합도는 0.458~1.834, 국부 통합도는 0.210~6.061로 나타났다. 삵의 이동경로와 도로가 중첩되는 5개 지점을 선정하여 통합도 값을 측정하였으며, 이들 지점 중 통합도가 높은 곳이 로드킬의 발생 가능성이 높은 곳이다. 따라서 5개 지점 중 전체 통합도와 국부 통합도가 가장 높은 곳을 각각 잠재적 이동통로 적지로 제안하였다. 국부 통합도가 가장 높은 지점에 터널형 이동통로가 건설 중에 있으며, 공사 완료 후 이들 지점에 대한 이동통로의 적지 여부를 검증할 것이다. Many wildlife habitats have been destroyed and fragmented during the rapid industrialization and urbanization process in Korea. It is essential to connect these fragmented habitats to reduce road-kill of many types of endangered urban wildlife. The site selection for wildlife passages must take into account the behavior of the wildlife species for safe crossing utilizing many artificial barriers in urban areas. This study attempted to identify potential wildlife passage sites for the endangered and protected leopard cats of Gangseo Ecological Park in Seoul, Korea. A space syntax analysis, an analytical technique to objectively evaluate the spatial configurations related to passage selection, found that the integration value represents the accessibility and connectivity of spaces. In this paper, this means that the bigger the integration value, the more frequently the leopard cat passes through. The leopard cats were captured and radio-tracked for 72 hours once a month from March to June of 2009. The ArcGIS and Animal Movement of Hawth Tools were used to analyze the home range and movement paths, and Axwoman 4.0 was used to analyze space syntax. The daily average movement distance was $2.099{\pm}1.08km$. During the survey period, the leopard cats crossed over an urban expressway more than 20 times, running the risk of road-kill. The range of global integration values was 0.458~1.834, while that of the local integration was 0.210~6.061. Five sites that met across the leopard cats' movement routes and roads were selected to measure the local and global integrate values. Among these sites, the higher the integration value, the higher the road-kill possibility. Thus, two of five sites with high global and local integration values were suggested as potential wildlife passage sites for the leopard cats. Now, three tunnel passages are under construction at the suggested sites for which local integration value was highest (LI=4.369). Further studies are scheduled to verify these potential sites as suitable wildlife passages.

ICP-CVD 방법에 의한 TiN barrier metal 형성과 특성

이유성,양두훈,오대현,양창실,강민성,최치규,오경숙 濟州大學校 基礎科學硏究所 1999 基礎科學硏究 Vol.12 No.1

TiN films were prepared on Si(100) substrate by ICP-CVD(inductively coupled plasma chemical vapor deposition) using TEMAT(tetrakis ethymethamido titanium : Ti[N(CH₃)(C2₂H?]₄) precursor at various deposition conditions. Phase, microstructure, and the electrical properties of TiN films were characterized by x-ray diffraction (XRD), x-ray photoelectron spectroscopy(XPS). Polycrystalline TiN films B1 structure were grown at temperatures over 300℃. Perferentially oriented along TiN(200) films were obtained at temperatures over 400℃ with the folw rates of 5 and 100 sccm for N₂and Ar gas. The TiN/Si(100) interface was flat and no chemical reaction between TiN and SiO₂was found. The resistivity, carrier concentration and the carrier mobility for the TiN sample prepared at 500℃ are 2070 μ Ωcm, 6.06X10? cm?³and 10.5X10³㎠/V·sec, respectively.

고밀도 플라즈마 CVD 방법에 의한 TiN barrier metal 형성과 특성

최치규,강민성,오경숙,이유성,오대현,황찬용,손종원,이정용,김건호,Choe, Chi-Gyu,Gang, Min-Seong,O, Gyeong-Suk,Lee, Yu-Seong,O, Dae-Hyeon,Hwang, Chan-Yong,Son, Jong-Won,Lee, Jeong-Yong,Kim, Geon-Ho 한국재료학회 1999 한국재료학회지 Vol.9 No.11

TEMAT precursor를 사용하여 다양한 증착 조건으로 ICP-CVD 방법으로 Si(100) 기판 위에 TiN 박막을 형성하였다. 형성된 TiN 박막의 결정상, 미세구조, 그리고 전기적 특성은 XRD, XPS, HRTEM, 그리고 전기적 측정으로 특성을 조사하였다. BI 구조를 갖는 다결정 TiN 박막은 기판의 온도가 $200^{\circ}C$ 이상의 온도에서 형성되었다. TiN(111) 박막은 기판의 온도가 $300^{\circ}C$에서 TEMAT, $\textrm{N}_{2}$, 그리고 Ar 가스의 유량이 10, 5, 그리고 5sccm으로 반응로에 주입할 때 형성되었다. TiN/Si(100) 계면은 TiN과 $\textrm{SiO}_2$사이에 계면반응이 없었으며 평탄하였다. 기판의 온도가 $500^{\circ}C$에서 형성된 TiN 박막의 비저항, carrier 농도와 이동도는 21 $\mu\Omega$cm, 9.5$\times\textrm{10}^{18}\textrm{cm}^{-3}$와 $462.6\textrm{cm}^{2}$/Vs으로 주어졌다. TIN films were prepared on Si(100) substrate by ICP-CVD(inductive1y coupled plasma enhanced chemical vapor deposition) using TEMAT(tetrakis ethylmethamido titanium : Ti$[\textrm{N}\textrm{(CH)}_{3}\textrm{C}_{2}\textrm{H}_{5}]_{4}$) precursor at various deposition conditions. Phase, microstructure, and the electrical properties of TIN films were characterized by x-ray diffraction (XRD), x-ray photoelectron spectroscopy (XPS), high resolution transmission electron microscopy (HRTEM) and electrical measurements. Polycrystalline TiN films with B1 structure were grown at temperatures over $200^{\circ}C$. Preferentially oriented along TiN(111) films were obtained at temperatures over $300^{\circ}C$ with the flow rates of 10, 5, and 5 sccm for TEMAT, $\textrm{N}_{2}$ and Ar gas. The TiN/Si(100) interface was flat and no chemical reaction between TIN and $\textrm{SiO}_2$ was found. The resistivity, carrier concentration and the carrier mobility for the TiN sample prepared at $500^{\circ}C$ are 21 $\mu\Omega$cm, 9.5$\times\textrm{10}^{18}\textrm{cm}^{-3}$ and $462.6\textrm{cm}^{2}$/Vs, respectively.