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Original Articles : Description of national avian influenza surveillance program in Korea
( Hachung Yoon ),( Oun Kyong Moon ),( Ji Da Choi ),( Woo Seog Jeong ),( Jun Hee Han ),( Young Mi Cho ),( Young Myung Kang ),( Hyo Young Ahn ),( Do Soon Kim ),( Tim Carpenter ) 한국예방수의학회 2014 예방수의학회지 Vol.38 No.2
This study describes the national program of year-round surveillance and monitoring for avian influenza (AI). The validity of the epidemiologically-based surveillance scheme was assessed. Korea’s current surveillance program is aimed at detecting subclinical infection of either the highly pathogenic avian influenza (HPAI) virus or the low pathogenic avian influenza virus, types H5 and H7, both of which carry risk of converting to HPAI. The current AI surveillance program has demonstrated that implementing a surveillance strategy is plausible. Farmer and livestock related professional support is the critical step of specimen collection to discover hidden infection. Early detection of AI virus infection can achieve best by the combined efforts of farmers, animal health authorities, and other related industries.
Epidemiology of brucellosis among cattle in Korea from 2001 to 2011
Hachung Yoon,Oun-Kyong Moon,이수한,Won-Chang Lee,Moon Her,정우석,Suk-Chan Jung,Do-Soon Kim 대한수의학회 2014 JOURNAL OF VETERINARY SCIENCE Vol.15 No.4
In the present study, the outbreak patterns of bovinebrucellosis in Korea from 2000 to 2011 were analyzed tounderstand the epidemiological evolution of this disease inthe country. A total of 85,521 brucella reactor animals wereidentified during 14,215 outbreaks over the 12-year studyperiod. The number of bovine brucellosis cases increasedafter 2003 and peaked in 2006 before decreasing thereafter. The majority of the bovine brucellosis cases were Koreannative cattle, Han Woo. The numbers of human brucellosiscases and cattle outbreaks increased and decreased in thesame pattern. The correlation coefficient for human andbovine cases per year was 0.96 (95% confidence interval =0.86∼0.99; p < 10−3). The epidemiological characteristicsof bovine brucellosis appeared to be affected by the intensityof eradication programs that mainly involved a testand-slaughter policy. Findings from the present study werebased on freely available statistics from web pagesmaintained by government agencies. This unlimited accessto information demonstrates the usefulness of government statistics for continually monitoring the health of animal populations.
Risk Assessment Program of Highly Pathogenic Avian Influenza with Deep Learning Algorithm
Yoon Hachung,Jang Ah-Reum,Jung Chungsik,Ko Hunseok,Lee Kwang-Nyeong,Lee Eunesub 질병관리본부 2020 Osong Public Health and Research Persptectives Vol.11 No.4
Objectives This study presents the development and validation of a risk assessment program of highly pathogenic avian influenza (HPAI). This program was developed by the Korean government (Animal and Plant Quarantine Agency) and a private corporation (Korea Telecom, KT), using a national database (Korean animal health integrated system, KAHIS). Methods Our risk assessment program was developed using the multilayer perceptron method using R Language. HPAI outbreaks on 544 poultry farms (307 with H5N6, and 237 with H5N8) that had available visit records of livestock-related vehicles amongst the 812 HPAI outbreaks that were confirmed between January 2014 and June 2017 were involved in this study. Results After 140,000 iterations without drop-out, a model with 3 hidden layers and 10 nodes per layer, were selected. The activation function of the model was hyperbolic tangent. Precision and recall of the test gave F1 measures of 0.41, 0.68 and 0.51, respectively, at validation. The predicted risk values were higher for the “outbreak” (average ± SD, 0.20 ± 0.31) than “non-outbreak” (0.18 ± 0.30) farms (p < 0.001). Conclusion The risk assessment model developed was employed during the epidemics of 2016/2017 (pilot version) and 2017/2018 (complementary version). This risk assessment model enhanced risk management activities by enabling preemptive control measures to prevent the spread of diseases.
Prevalence of bovine tuberculosis in dairy cattle in Korea from 1961 to 2004
Yoon, Hachung,Chung, Byung-Hyun,Yoon, Chong-Sam,Lee, Joo-Ho,Moon, Oun-Kyoung,Park, Seung-Yong,Lee, Won-Chang,Kim, Tae-Jong The Korean Society of Veterinary Science 2008 大韓獸醫學會誌 Vol.48 No.1
The trend in the prevalence of bovine tuberculosis (BTB) in Korean dairy cattle was investigated in relation to test programs used between 1961 and 2004, during which a total of 8,961,061 dairy cows were tested and 10,248 confirmed to have BTB. The annual prevalence increased in the late 1960s, then decreased during the 1970s and 1980s, and started to increase again from the late 1990s. It seemed that the prevalence varies according to the different test program used. The prevalence of BTB was higher when the tests were performed with heat-concentrated synthetic medium (HCSM) or purified protein derivative (PPD) tuberculin alone compared to that when using combined HCSM and PPD tuberculin testing.
Estimation of prevalence and sampling to estimate prevalence of Bovine Tuberculosis
( Hachung Yoon ),( Wooseog Jeong ),( Jae Woon Jeong ),( Youn Ju Kim ),( Woo Jin Jeon ),( Oun Kyong Moon ) 한국예방수의학회(구 한국수의공중보건학회) 2013 예방수의학회지 Vol.37 No.1
This study describes a series of processes for development of a survey aimed at understanding the actual state of an infectious disease. It includes of a survey for estimation of prevalence, analysis of investigated data and appraisal of the operation. Examples were inspired from a survey on bovine tuberculosis in Korean native cattle (Bos Taurus coreanae), conducted between October and December 2007. The methodology concerns stratification, two-stage cluster sampling, intraduster correlation, and the probability of detecting cases in a population. This study is expected to serve as an example in operating surveillance and monitoring systems for animal health programs at the national level.
Control of Foot-and-Mouth Disease during 2010–2011 Epidemic, South Korea
Park, Jong-Hyeon,Lee, Kwang-Nyeong,Ko, Young-Joon,Kim, Su-Mi,Lee, Hyang-Sim,Shin, Yeun-Kyung,Sohn, Hyun-Joo,Park, Jee-Yong,Yeh, Jung-Yong,Lee, Yoon-Hee,Kim, Min-Jeong,Joo, Yi-Seok,Yoon, Hachung,Yoon, Centers for Disease Control and Prevention 2013 Emerging infectious diseases Vol.19 No.4
<P>An outbreak of foot-and-mouth disease caused by serotype O virus occurred in cattle and pigs in South Korea during November 2010–April 2011. The highest rates of case and virus detection were observed 44 days after the first case was detected. Detection rates declined rapidly after culling and completion of a national vaccination program.</P>