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우리 나라 젖소 및 한우의 Bovine Leukemia Virus 항체 분포조사
서국현,이정길,이채용,허태영,강석진,손동수,류일선,안병석,김남철,주이석 한국임상수의학회 2003 한국임상수의학회지 Vol.20 No.2
As a baseline study for the establishment of bovine leukemia virus(BLV)-free herd in Korea, the prevalence of anti-BLV antibody was determined in the present study. Sera from Korean native cows of 8 provinces and from dairy cattle of 9 provinces were subjected to enzyme-linked immunosorbent assay. Anti-BLV antibodies were positive in two (0.14%) of 1,413 Korean native cows. In contrast, 54.2% of 2,415 dairy cows were positive for anti-BLV antibodies, and their seropositive herd rate was 86.8%. And no differences were found in the sero-positive rates with age. The results indicate that the BLV infection rate has been increased continuously in Korea and that the establishment of BLV-free herd is imminent.
Establishment of a bovine leukemia virus-free dairy herd in Korea
서국현,이정치,이채용,허태영,손동수,안병석,김남철,이정길 대한수의학회 2005 Journal of Veterinary Science Vol.6 No.3
In view of the high prevalence rate of bovine leukemia virus (BLV) infections in cattle over the entire country, a large dairy farm in Chungnam province was chosen and‘test and segregate’ program was instituted. On July 1999, ELISA test was performed on 491 animals on the farm and only 163 cattle (139 adult cows, 18 female and 6 malecalves) were BLV-seronegative. From February 2000 through April 2004, the seronegative group was placed in barns 1,500 to 2,000 m from seropositive group andthereafter tested at 3- to 5-month intervals by ELISA. Animals seroconverted in consecutive tests were removed from the seronegative group immediately after thedetection of anti-BLV antibodies. The changes in management were aimed at preventing iatrogenic transfer of blood between cattle. Replacement heifers importedfrom other countries and calves born at the farm were repeatedly tested by ELISA, and only seronegative animals were introduced into the group. As of April 2004, there were 311 cattle in the BLV seronegative group of the farm. Twenty four cows of the initial 139 adult cows were seroconverted in 2000, and no seropositive animals were found since February 2001. Follow up of the group, from which all seropositive cattle were moved to a separate location, revealed no recurrence of BLV infection for three years. The approach in the present study might be valuable for Korean producers who would like to move toward a BLV-negative status.
목초(牧草)에 나타나는 면양위장(緬羊胃腸)내 선충류(線蟲類) 유충(幼蟲)의 시기(時期)적 변화(變化)
서국현,이정길,박영준,이차용,Suh, Guk-hyun,Lee, Chung-gil,Park, Young-jun,Lee, Chai-young 대한수의학회 1990 大韓獸醫學會誌 Vol.30 No.4
The seasonal availability and abundance of the free-living stages of sheep nematodes is a key factor in the occurrence and severity of parasitic infection, and studies of larvae ecology could result in more rational control measures. In the present study seasonal pasture contamination and availability of nematodes for grazing sheep was examined as a baseline work for nematode control program at Namwon Branch, National Animal Breeding Institute during the period April 1988 through March 1989. Standard meteorological measurements were available from Unbong Sub-station, Honam Crops Experiment Station located about 200m from the experimental site. A total of 5 kinds of nematode larvae was detected: Haemonchus contortus was most prevalent (38.0%) with a decreasing order of Ostertagia spp (35.1%), Trichostrongylus spp (19.8%), nematodirus spp (6.6%), and Oesophagostomum spp (0.5%). A succession of species was recorded, in particular Ostertagia spp in May; Haemonchus contortus in June and July; Trichostrongylus spp in July and August; Nematodirus spp in August and September. These results can be incorporated into the nematode control program. To make a more rational control program, however, repeated herbage larval counts should be undertaken soil larval counts and fecal larval counts in the future.
서국현,안병석,강만석,손동수,이광원,지설하,박창식 韓國受精卵移植學會 1993 한국동물생명공학회지 Vol.8 No.1
This study was carried out to investigate the effects of imported 0.25 ml straw frozen semen on fertilizing capacity after artificial insemination. A total of 57 ewes of Corriedale were inseminated at the Namwon Branch, National Anirnal Breeding Institute. Lambing percentage and twinning percentage were 12.3% and 114. 3%, resepectively. Average weight at birth and weaning of 120 days old were 4.5kg and 21.9 kg, respectively. Gestation period was 152.6 days.
Bovine leukemia virus에 감염된 우리 나라 젖소의 말초혈액 내 림프구 수
서국현,이정길,이채용,허태영,이정치,강석진,손동수,안병석,김남철,Suh, Guk-hyun,Lee, Chung-gil,Lee, Chai-yong,Hur, Tai-young,Lee, Jeong-chi,Kang, Seog-jin,Son, Dong-soo,Ahn, Byeong-seog,Kim, Nam-chul 대한수의학회 2005 大韓獸醫學會誌 Vol.45 No.2
Hematologic investigations were made on the blood samples taken from bovine leukemia virus (BLV)-seropositive Holstein-Friesian cattle in Korea, and their absolute lymphocyte count was compared with that of BLV-seronegative cattle. The incidence of persistent lymphocytosis (PL) was also determined. The normal bovine lymphocyte count was established on the basis of studies of 656 blood samples taken three times from 297 seronegative animals aged from 0~6 months to over 5 years at 5~6-month intervals. The data were examined according to 7 age groups of samples placed into their respective age groups. A peak in average total count was reached at 6~12 months ($5.36{\times}10^3/{\mu}l$) and thereafter the count declined continuously until over 5 years ($3.17{\times}10^3/{\mu}l$). From the results, 99.74 percent limits were calculated, and the upper limit of the range was chosen as the cutoff point for lymphocytosis. A PL was defined as a lymphocyte count that exceeded the above 99.74 percent limits and persisted over an interval of at least three months. The criterion for PL was applied to classifying 515 blood samples obtained four times from 189 seropositive animals without clinical signs at 5~7-month intervals. It was found that 54 (28.5%) of seropositive animals were with PL; cattle with PL were in age groups of 2~3 years to over 5 years.
박구용(Gu Yong Park),김윤식(Yoonsik Kim),조남익(Nam Ik cho) 한국방송·미디어공학회 2019 한국방송공학회 학술발표대회 논문집 Vol.2019 No.11
영상 잡음 제거 알고리즘은 잡음으로 오염된 영상으로부터 잡음이 제거된 깨끗한 영상을 추정하여 복원하는 연구이다. 기존의 모델 기반 방법의 영상 잡음 제거 알고리즘은 영상을 복원하는 과정에서 최적화 문제를 풀어야 한다는 단점과 매개변수를 직접 선택을 해주어야 한다는 단점을 가진다. 본 논문에서는 딥러닝을 이용한 학습기반 방법의 영상 잡음 제거 연구를 소개한다. 먼저, 신경망의 구축을 위하여 신경망의 구성 요소는 Instance Normalization 과 컨볼루션 신경망을 이용한 모델을 제안하였고, 여러 연구 분야에서 좋은 성능을 보이는 UNet 구조를 전체적인 구조로 차용하였다. 신경망의 학습을 위하여 DnCNN 에서 제안한 잡음을 학습하는 잔여 학습 기법을 채택하였고, 기존의 영상 잡음 제거 알고리즘의 단점인 결과 영상이 흐릿해지는 현상을 보완하기 위하여 생성적 적대 신경망 학습 방법을 적용하였다. 본 논문에서 제안한 신경망을 이용한 잡음 제거 영상의 결과가 기존의 연구 방법들 보다 인지적인 측면에서 좋은 결과를 보임을 확인하였다.