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환경유래 젖소유방염 저감을 위한 우분뇨 탈수 시스템의 탈수 및 유방염 원인체 제균 효과 규명
김동혁,임정주,이진주,김대근,장홍희,이승주,이윤범,장동일,이후장,민원기,김상훈,오권영,김석,Kim, Dong Hyeok,Lim, Jung Ju,Lee, Jin Ju,Kim, Dae Geun,Chang, Hong Hee,Lee, Seung Joo,Lee, Yun Beom,Chang, Dong Il,Lee, Hu Jang,Min, Won-Gi,Kim, Sang 대한수의학회 2009 大韓獸醫學會誌 Vol.49 No.3
Bovine mastitis is an important disease causing serious economic loss in dairy production and food poison in public health. Escherichia coli and Staphylococcus aureus are the major causative agents of bovine mastitis. These bacteria were found in milk and environmental condition such as feces, water, soil and so on. Bovine mastitis causative micro-organisms can survive in 1-2 weeks in feces and bed complexes. Low level of percentage of water content (PWC) of feces and bed complexes can reduce the spreading of bovine mastitis incidence from environmental contamination. In this study, we developed the fecal dehydrating system and determined the elimination rates of bovine mastitis causative agent from feces and bed complexes. To develop the fecal dehydrating system, the screw pressurized dehydrating system was used and the maximum rate of dehydrating was reached to 52% PWC using 90% PWC (wet base) of fecal and bed complexes. The elimination rates of the dehydrating system for E. coli and S. aureus were reached at 41.19 $\pm$ 7.84% to 62.55 $\pm$ 8.71% in various percentages of PWC of feces and bed complexes (80, 85 and 90%). These results suggested that the application of fecal dehydrating system would reduce the exposure of dairy cattle to bovine mastitis causing agents contaminated feces and bed complexes, and can be used for environmental bovine mastitis control avoiding misuse or abuse of chemical disinfectants and antibiotics in dairy farm.
김동혁 ( Kim Dong-hyeok ) 대구가톨릭대학교 인문과학연구소 2017 인문과학연구 Vol.0 No.31
The main focus of this study is the introduction of the follow-up process for selecting the raw materials the sentence pattern for the expansion of the raw materials and the process of editing the draft. One of the main reasons for this process is that it is crucial for new students to be created as the most practical way to create a one-growth course a one-growth process. It can be said that it is a writing style that is thought to be written by a college freshman. All kinds of articles are alike, but each genre has its own material and composition. Given that the practical writing of new students is the process of practicing for fully-functioning work in the future, it will certainly be worthwhile to complete their own growth process in this structured frame of view.
연구보문 : 생태환경 ; 우분뇨 유래 젖소 유방염 저감을 위한 자외선 조사 살균의 효과 규명
김동혁 ( Dong Hyeok Kim ),임정주 ( Jung Ju Lim ),이진주 ( Jin Ju Lee ),장홍희 ( Hong Hee Jang ),장동일 ( Dong Il Jang ),이승주 ( Seung Joo Lee ),이후장 ( Hu Jang Lee ),민원기 ( Won Gi Min ),권순홍 ( Sun Hong Kwon ),김상훈 ( Sang H 한국환경농학회 2008 한국환경농학회지 Vol.27 No.4
E. coli, S. agalactiae, S. aureus는 젖소의 유방염을 유발하는 주요 원인균들이다. 이 균들은 분변 혹은 우유에 존재하며, 감염되지 않은 다른 개체로의 감염을 유발한다. 자외선은 소독제로서 이미 산업계 및 의료계에서 쓰레기 및 물의 살균에 사용되고 있으므로, 자외선을 이용하여 젖소의 유방염 확산을 방지하는 것의 실효성을 검증하였다. 분변의 함수율은 젖소 유방염 유발균의 증식에 영향을 미치지 않았고, 144시간 이상의 장시간 생존이 가능함을 확인 하였다. 자외선의 조사 시, 조사하는 동안 우분뇨 및 톱밥을 교반하는 것이 교반하지 않는 것보다 균의 증식을 억압하는 것을 확인할 수 있었다. 한편, 자외선의 살균력은 함수율이 낮을수록, 조사시간이 길수록, 조사거리가 짧을수록 더 증가하는 것을 확인할 수 있었다. 본 실험을 통해 얻은 함수율, 조사시간, 조사거리, 교반 여부에 대한 결과는 환경 유래, 특히 우분뇨 유래 젖소 유방염의 감염을 예방하고자 할 때 자외선 살균기의 적용이 가능할 것이며, 현장에 적용할 살균기의 제작에 중요한 기초 자료로서 활용될 것이다. Bovine mastitis is an important disease causing serious economic loss in dairy production and food poison in public health. The major causative agents of bovine mastitis include Escherichia coli (E. coli), Streptococcus agalactiae (S. agalactiae), Staphylococcus aureus (S. aureus). These bacteria were found in milk and environmental condition such as feces, water, soil and so on. Recently, many cases of mastitis are derived from environmental contamination of micro-organisms, which important factors for the spread of this disease in farm. Ultraviolet irradiation (UV) has been used as disinfection for waste and water in clinical and industrial facilities. Moreover the UV irradiation has been used as useful bactericidal agents to remove bacterial biofilms in environmental condition. In this study, we determined the bacterial replication in different percentage of water content (PWC) in sterilized saw dust and feces complexes from farm, and results showed that slightly decreased growth pattern of E. coli and S. agalactiae but increased growth pattern of S. aureus in various PWC (200, 400 and 600%) until 144 h incubation. In the bacteriocidal effect of UV irradiation to bacteria in saw dust and feces complex, the results showed that bacteriocidal effect was depended on the UV irradiation time, irradiation distance and PWC. Especially the antibacterial activity of UV irratiation is stronger in low PWC (50%), long time irradiation (50 sec), and short distance (5 cm) than other condition of this study. Furthermore UV irradiation with stirring showed increased the bactericidal effect compared without stirring. These results suggested that bovine mastitis causing agents may survive long time in environmental condition especially saw dust and feces complexes in farm and can cause a various disease including mastitis. Moreover, these data can be used as basis for application and development of UV disinfection to control of bovine mastitis from environmental contaminated bacteria in dairy farm.
‘문학적 공간’의 분석을 통한 ‘지리적 공간’의 재구성 : 하근찬의 『수난이대』를 중심으로
김동혁(Kim Dong-Hyeok) 중앙어문학회 2011 語文論集 Vol.46 No.-
The paper went through ‘ the sufferings of the Father and the Son’ appeared in a novel course of action in space for all three shows in detail the scheme was drawn. What three things: writer's autobiographical process. electrical materials through the geo-spatial reasoning, and the text of the inner leads identified through the analysis of geo-spatial data and maps, and photos on the basis of field survey is to identify through the actual space. Through the above process, this paper meet the son of a leading figure in the novel and home city associated with the actual circulation of the work in the background could be found. In this paper, especially by the imagination of writers born in the name of the 'dragon head hill' of the local research and teaching materials through the use of 'the dragon head hill' model has found a place with an estimated value. In addition, the city's maps and satellite photos with the background 'Yeongcheon' city work by people in the reconstructing of the copper was very realistic. It continued after the author's research data and will be utilized.