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돈군의 Salmonella 모니터링을 위한 림프절 추출액 사용에 대한 평가
정병열,추지훈,김지훈,정재윤,Jung, Byeong-Yeal,Choo, Ji-Hoon,Kim, Ji-Hun,Jung, Jae-Yun 대한수의학회 2006 大韓獸醫學會誌 Vol.46 No.2
The objective of this study was to investigate the use of extract from mesenteric lymph nodes as an alternative to serum for ELISA to detect Salmonella antibodies in slaughter pigs. Among 324 slaughter pigs, 65 (20.1 %) were positive in the serum ELISA and 76 (23.5%) were positive in the ELISA with extract from lymph nodes. A total of 24 (7.4%) Salmonella representing 6 serotypes were isolated from mesenteric lymph nodes and 35 (10.8%) Salmonella belonging to 2 serotypes were also recovered from cecal contents of slaughter pig samples, respectively. The most prevalent serogroup was B (55.9% of isolates) and serotype was Typhimurium (52.5% of isolates). In the comparison of the results of between the serum ELISA and Salmonella isolation, kappa value was 0.28 with mesenteric lymph nodes and 0.37 with cecal contents, respectively. However, the extract ELISA had sensitivity of 98.5%, specificity of 95.4% and kappa value of 0.88 as compared with the serum ELISA. Because high degree of concordance between the serum ELISA and the extract ELISA was observed (P=0.24), extract from lymph nodes could be used as an alternative to serum for the detection of Salmonella antibodies in the ELISA.
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김봉환,추지훈,조광현,박최규,정병열,Kim, Bong-Hwan,Choo, Ji-Hoon,Cho, Kwang-Hyun,Park, Choi-Kyu,Jung, Byeong-Yeal 대한수의학회 2006 大韓獸醫學會誌 Vol.46 No.1
This paper describes the slaughter check results of breeding pigs from the Korean Swine Testing Station for the control of endemic diseases. Gross lesions monitored in the present study included those conditions commonly associated with economically significant subclinical herd infections: enzootic pneumonia, pleuropneumonia, pleuritis, atrophic rhinitis, liver white spots, papular dermatitis and ileitis. A total of 128 slaughter pigs were investigated at 4 subsequent tests according to the slaughter check procedures established. The prevalence of enzootic pneumonia, pleuropneumonia and pleuritis in the initial test was 67.9%, 28.6% and 17.9%, respectively. However, these were decreased to 46.7%, 6.7% and 6.7%, respectively, in the last test after implementation of counter measures including clean-up protocols and medication programs (p > 0.05). The mean pneumonic score also significantly decreased from 6.8 in the initial test to 2.8 in the last test. The prevalence of atrophic rhinitis (${\geq}score\;2$) was 32.2% and mean atrophic rhinitis score of 1.1 were recorded. However, no significant improvement of conditions was achieved with the counter measures indicating that atrophic rhinitis was originated from the source herds and lesions developed early in the life. In the initial test, prevalence of liver white spots and papular dermatitis lesions was 21.4% and 25.0%, respectively. These conditions were cleaned by the implementation of parasite control measures with all-in all-out, strict clean-up protocols and proper medications adopted in the present study (liver white spots, p = 0.0124; papular dermatitis lesions, p = 0.0055). The prevalence of ileitis lesions in slaughter pigs from the initial test was 28.6%, it could be gradually reduced by the use of repeated treatments and control measures but the effect was not so significant (p > 0.05). In conclusion, slaughter check procedures were successfully established and applied for the control of endemic diseases in the Korean Swine Testing Station.
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PIV 기법을 이용한 손톱건조기 내부 이온풍 주변 유동 가시화 및 열원의 열전달에 대한 연구
김동형(Dong Hyeong Kim),오승민(Seung Min Oh),유환민(Hwan Min Yoo),추지훈(Ji Hoon Choo),고한서(Han Seo Ko) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
In this study, the heat transfer efficiency was improved inside a nail dryer by utilizing the ionic wind generated by the release of corona discharge. First, the flow field of the ionic wind according to various conditions was obtained by the flow visualization using a PIV (Particle image velocimetry) method. With these results, the boundary conditions of a CFD(Computational fluid dynamics) could be imported and velocity profiles induced by the boundary layer were identified. The heat transfer experiments were also carried out, and the reliability was validated by comparing the results of the experiment with the numerical analysis. As a results, the high voltage could induce the high flow rate of the ionic wind and the great heat transfer efficiency which could be expressed by the Nusselt number.
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