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Hansung Chung,Hyobi Kim,Donghoon Myeong,Seongjoon Kim,Nong-Hoon Choe 한국축산식품학회 2018 한국축산식품학회지 Vol.38 No.3
Controlling of microorganisms in the industrial process is important for production and distribution of hatching and table eggs. In the previous study, we reported that chlorine dioxide (ClO2) gas of a proper concentration and humidity can significantly reduce the load of Salmonella spp. on eggshells. In this study, we compared microbial reduction efficacy on egg’s surface using hatching eggs and table eggs, internal quality of table eggs, and hatchability after both the conventional method (washing and UV expose, fumigation with formalin) and ClO2 gas disinfection. Application of 40 ppm ClO2 gas to the table and hatching eggs, respectively, reduced the aerobic plate count (APC) with no statistical difference compared with the conventional methods. Additionally, we didn’t observed that any significant difference in albumin height, Haugh unit (HU), and yolk color, this result confirms that 40 ppm ClO2 had no effect on the internal quality of the table eggs, when comparing with the UV treatment method. The hatchability of hatching eggs was not statistical different between formaldehyde fumigation and 80 ppm ClO2 gas treatment, though the value was decreased at high concentration of 160 ppm ClO2 gas. From these results, we recommend that ClO2 gas can be used as a safe disinfectant to effectively control egg surface microorganisms without affecting egg quality.
Evaluation of carcass yield and digestive conditions in HANWOO and pigs during feed withdrawal time
Hansung Chung,Donghoon Myeong,Seongjoon Kim,Byung-Joon Chang,NongHoon Choe 한국예방수의학회(구 한국수의공중보건학회) 2017 예방수의학회지 Vol.42 No.2
The study was conducted to investigate the effects of feed withdrawal on gastrointestinal weight, digestive condition, and carcass yield. The effects were studied in 36 HANWOO and 245 pigs. The weight of the gastrointestinal tract decreased with fasting time in both HANWOO and pigs. No significant differences in weight of HANWOO stomachs, intestinal tracts, and carcass yields were observed throughout the experimentals. Among pigs, significant differences in gastrointestinal tract weight were observed when comparing short fasting time (4 h) with long fasting time (above 12 h) (p<0.05). HANWOO and pigs showed no significant differences in carcass yield during fasting times. These results suggested that feed withdrawal for 16 and 12 hours is appropriate for HANWOO and pigs.
Evaluation of carcass yield and digestive conditions in HANWOO and pigs during feed withdrawal time
Hansung Chung,Donghoon Myeong,Seongjoon Kim,Byung-Joon Chang,NongHoon Choe 한국예방수의학회 2017 예방수의학회지 Vol.41 No.2
The study was conducted to investigate the effects of feed withdrawal on gastrointestinal weight, digestive condition, and carcass yield. The effects were studied in 36 HANWOO and 245 pigs. The weight of the gastrointestinal tract decreased with fasting time in both HANWOO and pigs. No significant differences in weight of HANWOO stomachs, intestinal tracts, and carcass yields were observed throughout the experimentals. Among pigs, significant differences in gastrointestinal tract weight were observed when comparing short fasting time (4 h) with long fasting time (above 12 h) (p<0.05). HANWOO and pigs showed no significant differences in carcass yield during fasting times. These results suggested that feed withdrawal for 16 and 12 hours is appropriate for HANWOO and pigs.
( Hansung Chung ),( Kwanghoon Choi ),( Sungkwan Kim ),( Sukwon Kim ),( Kyungwoo Lee ),( Nonghoon Choe ) 한국미생물생명공학회(구 한국산업미생물학회) 2021 Journal of microbiology and biotechnology Vol.31 No.7
To prevent the outbreak of infectious diseases that inflict huge economic and social losses, domestic livestock farms and related facilities have introduced automatic and semiautomatic disinfectant solution-spraying systems for vehicles. However, the facility standards and specifications vary by manufacturer, and no scientific performance evaluation has been conducted. The puropose of this study is to develop physical and biological evaluation methods. Physical and biological appraisals were conducted using two types of disinfection facilities (tunnel- and U-type) and two types of vehicles (passenger car, truck). Water-sensitive paper was used to evaluate the physical performance values for the disinfection facilities. In addition, to assess their biological performance, carriers containing low-pathogenic avian influenza virus were attached to vehicles, and the viral reduction was measured after the vehicles moved through the facility. The tunnel-type had rates of coverage in the range of 70-90% for the passenger car and 60-90% for the truck. At least 4-log virus reduction after spraying for 1-5 min was shown for both vehicles. For the U-type facility evaluation, the coverage rates were in the range of 60-90% for the passenger car and at least 90% for the truck. More than 4-log viral reduction was estimated within a spraying time of 5 min. To reduce viruses on the surface of vehicles by at least 4 log within a short period, the disinfectant solution should cover at least 71% of the pathogens. In conclusion, we were able to assess the physical and biological performance criteria for disinfection facilities aboard transportation vehicles.
A Cost-Effective Pigsty Monitoring System Based on a Video Sensor
( Yongwha Chung ),( Haelyeon Kim ),( Hansung Lee ),( Daihee Park ),( Taewoong Jeon ),( Hong-hee Chang ) 한국인터넷정보학회 2014 KSII Transactions on Internet and Information Syst Vol.8 No.4
Automated activity monitoring has become important in many applications. In particular, automated monitoring is an important issue in large-scale management of group-housed livestock because it can save a significant part of farm workers` time or minimize the damage caused by livestock problems. In this paper, we propose an automated solution for measuring the daily-life activities of pigs by using video data in order to manage the group-housed pigs. Especially, we focus on the circadian rhythm of group-housed pigs under windowless and 24-hour light-on conditions. Also, we derive a cost-effective solution within the acceptable range of quality for the activity monitoring application. From the experimental results with the video monitoring data obtained from two pig farms, we believe our method based on circadian rhythm can be applied for detecting management problems of group-housed pigs in a cost-effective way.
정재영(Jaeyoung Chung),강한성(Hansung Kang),고수빈(Subin Ko),김재욱(Jaewook Kim),여태민(Taemin Yeo),이건희(Gunhee Lee) 한국과학영재교육학회 2011 과학영재교육 Vol.3 No.3
본 연구에서는 고등학교 수준에서 다루어질 수 있는 주제로서 문제 해결력을 위한 좋은 과제인 함수방정식을 다루고 있다. 이 분야에서 특히 중요한 위치를 차지하고 있는 방정식인 코시함수방 정식과 그리고 이와 연관된 젠센함수방정식, 펙시드함수방정식, 로그함수방정식 등이 제한된 영역 에서 만족할 때 이 방정식들의 일반해와 정칙해를 구한다. In this paper the authors deal with functional equations which is a good research topic for high school students. In particular, they consider the Cauchy equation, Pexider equation, Jensen equation and logarithmic functional equation satisfied in the complements of rhombi or in the half planes, and find the general solutions and the regular solutions of the equations.