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사향쥐(Ondrtra cuniculus)의 정착 및 서식지 이용에 관한 연구
김영채,홍선희,이창우,김아름,박희복,박수곤,김민한,이도훈,Kim, Young-Chae,Hong, Sun Hee,Lee, Changwoo,Kim, Areum,Park, Heebok,Park, Su-Gon,Kim, Minhan,Lee, Do-Hun 한국환경생물학회 2020 환경생물 : 환경생물학회지 Vol.38 No.1
본 연구는 침입종 사향쥐의 국내 자연생태계 정착 여부를 확인하였다. 아울러 관리전략 수립과 현장 관리에 필수적인 관리대상지역과 기초적인 행동특성 정보, 서식지 이용에 관한 자료를 제공하고자 하였다. 이를 위해 해외의 사향쥐 관리 동향을 파악하여 정착 단계에 따른 관리 방향을 검토하였다. 그리고 국내 72개 사육농가의 위치정보를 확보하였고, 실태조사를 통해 경기도, 충청남도, 경상북도, 세종특별자치시 소재 5개 지역을 자연 유출 가능성이 높은 지역으로 제시하였다. 또한, 2016년부터 2018년까지 3년간 동일 지점에 서식하는 개체를 모니터링하였다. 2018년 모니터링 지역에서 포획한 개체의 연령이 1.2년생으로 확인되었으며, 2012년 이후 해당지역에 추가적인 개체 보충이 없었다는 사실에 근거하여 국내 자연생태계에 사향쥐가 정착한 것으로 판단하였다. 국내 자연에 정착한 사향쥐는 0.0027 ㎢ (MCP 95%)의 작은 행동권을 나타내었으며, 봄철과 가을철 규칙적인 이동성을 보이는 것으로 나타났다. 사향쥐의 서식이 관찰된 지역은 서식환경의 교란이 높게 발생한 지역이었으며, 사향쥐의 흔적 출현 빈도는 부엽식물과 부유식물의 생육이 왕성한 개방수역과 개체의 은신처로 활용 가능한 습생목본 식생유형에서 높게 확인되어 이들의 생태적 특성과 섭식 습성이 그대로 반영되었다. 국제적인 침입종 사향쥐가 국내 생태계에 정착하였고, 향후 확산이 우려되는 만큼 정부 차원의 선제적 대응과 과학적 관리를 위한 필수 자료 구축이 검토될 필요가 있다. This study was conducted to determine whether invasive muskrats settle in the natural ecosystem of Korea. The study also aimed to provide information on the selection of target areas, basic behavioral characteristics, and habitat use-related data, all of which are essential for effective management strategy establishment and site management. To this end, a trend in international muskrat management was identified to examine the management direction according to the settlement stage. We also secured the location of 72 domestic farmers and classified five regions in Gyeonggi-do, Chungcheongnam-do, Gyeongsangbuk-do, and Sejong Special Self-governing City into regions with high potential for natural leakage to raise the need for a quick survey. We determined that muskrats successfully settled in the natural ecosystem of Korea, based on the fact that we consistently identified a muskrat habitat at the same point for three years, from 2016 to 2018, the age of the captured population was estimated to be 1.2 years, and there had been no additional make-up factors near the habitat since 2012. The muskrats that settled in Korea showed a small home range of 0.0027 ㎢ (MCP 95%) and were estimated to show regular mobility before Spring and Autumn. Also, the areas where the muskrat habitat was observed had a high level of habitat environment disturbance and their ecological and food intake characteristics reflected that disturbance. Muskrat traces were high in hydrophyte vegetation, which can be used as a hideout in open waters and where the growth of both floating leaved plants and floating plants are prevalent. Since international invasive muskrats have already settled in the domestic ecosystem and there is concern about their proliferation in the future, the government must consider a preemptive response and scientific management.
가성낭종을 동반한 만성 췌장염에서 , 자연소실된 비정맥혈전증 1 예
김정열(Jeong Yeol Kim),이지훈(Ji Hoon Lee),김기홍(Ki Hong Kim),손미정(Mi Jeong Sohn),정호경(Ho Kyeong Jeong),김민구(Min Ku Kim),강병선(Byeong Sun Kang),박동열(Dong Yeol Park),이옥재(Ok Jae Lee),김영채(Yong Chai Kim) 대한내과학회 1996 대한내과학회지 Vol.51 No.6
Splenic vein thrombosis is infreqently recognized as a cause of gastroesophageal varices and upper G-I bleeding. Extrahepatic portal hypertension constitute 5-10% of portal hypertension. Isolated obstruction of the splenic vein leads to isolated or segmental hypertension. The diagnosis of splenic vein thrombosis with gastroesophageal varices is important, since it can be cured by splenectomy. We report one cause of spontaneously resolved splenic vein thrombosis with gastroesophageal varices associateed with chronic pancreatitis with pseudocyst in 41-year old man. He suffered from epigastric pain for 4 months. UGI series and endoscopy revealed varices of gastric fundus and lower esophagus. Two years later, follow-up endoscopy showed no esophageal and gastric varices. On abdominal USG, no evidence of splenic vein thrombosis was observed.
자기 저항 헤드의 이중 자기 교환 바이어스를 위한 NiFe / TbCo / Si₃N₄ 박막제조
김영채(Y. C. Kim),오장근(J. G. Oh),조순철(S. C. Jo) 한국자기학회 1994 韓國磁氣學會誌 Vol.4 No.3
NiFe /TbCo /Si₃N₄ thin films were fabricated, which can be employed as dual(longitudinal and transverse) biased magnetoresistive elements utilizing surface magnetic exchange at the interface of NiFe /TbCo films. When Tb area percent was 36 % and substrate bias was not applied, magnetic exchange fields of 100 ~ 180 Oe were obtained. The thicknesses of NiFe, TbCo and Si₃N₄(Protective layer) were 470 Å, 2400 Å and 600 Å, respectively. Magnetoresistance ratio of 1.45 % was obtained using NiFe films fabricated with 1000 W power and 2.5 mTorr of Ar pressure. The MR ratio of microstructured elements was reduced to 1.31 % and the MR response curves were shown not to saturate due to demagnetizing fields of the elements. When elements were fabricated with 36˚ of misalignment with respect to the exchange field direction using films having 150 Oe exchange field, MR response curve was shifted by 85 Oe, and the operating point of the device shifted to the linear region of the response. Also, the Barkhausen noise was eiminated due to longitudinal bias field originating from the exchange field.
열 분해법으로 제조된 Bi 치환 자기 가넷 박막의 광자기적 성질
김영채(Y. C. Kim),조순철(S. C. Jo) 한국자기학회 1993 韓國磁氣學會誌 Vol.3 No.2
Bi_xDy_(3-x)Al₁Fe₄O₁₂ (x=1, 1.2, 1.5) magnetic garnet films were fabricated on the glass substrates by pyrolysis method. As the Bi content was increased, the saturation magnetization increased from 5 emu / cc to 11 emu / cc and all the films showed perpendicular magnetic anisotropy. As the content of Bi was increased, Faraday rotation angle (θ_F) at 780 ㎚ of the films increased from 0.11° / ㎛ to 0.20° / ㎛ and the garnet crystallization temperature decreased from 660 ℃ to 630 ℃. Also, the coercivity (Hc) decreased from 1200 Oe to 600 Oe and the grain sizes increased. Hc decreased from 1750 Oe to 1200 Oe and θ_F increased due to the interference of the reflected laser light as the thickness of the films increased from 2000 Å to 4000 Å.