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박천홍,김석일,이후상,Park, Cheon-Hong,Kim, Seok-Il,Lee, Hu-Sang 한국기계연구원 1988 기계연구원소보 Vol.18 No.-
In this study, a series of experiments and analyses are performed to estimate the static characteristics of hydrostatic journal bearing such as load capacity, pressure change in each recess, eccentricity of spindle, etc. The experiments are carried out for a multi-recess type journal bearing with capillary restrictor. The Finite Element Method(FEM) is used for the analyses. The predicted load capacity under the condition of stationary or eccentric ratio of bellow 0.2 of the spindle shows excellent agreement with the measured. But, with an increase of the eccentric ratio when the spindle is rotating, the predicted load capacity is largely estimated than the measured. It seems that the difference is mainly caused among others from the fact that the effect of oil-viscosity variation due to the temperature change in the bearing is not introduced into the analyses. The analysis method proposed to estimate the static characteristics of hydrostatic journal bearing is considered to be very reliable since the predicted results are overall in good agreement with the measured.
레드머드 첨가에 따른 알칼리활성화 슬래그-레드머드 건식 흙포장재의 다짐 특성
강혜주 ( Kang Hye Ju ),이후석 ( Lee Hu Seok ),황병일 ( Hwang Byuong Il ),강석표 ( Kang Suk Pyo ) 한국건축시공학회 2017 한국건축시공학회 학술발표대회 논문집 Vol.17 No.2
For this study, alkali-activated slag red-mud pavement is manufactured to examine the usability of red-mud as a recycling material in the construction industry. In the compaction curve in terms of the replacement ratio of red mud by binder type, the dry density changed gradually depending on the water content, which implies that there is no distinct difference in compaction according to the replacement ratio of red mud. The compressive strength at 28 days was observed to be 18.9~27.0MPa in ASS, and 18.4~28.8MPa in OPC, showing a similar level between the specimens.
광주기 변화에 따른 마우스의 스트레스 호르몬, 면역기능 및 혈액학적 지표에 미치는 영향
박승휴,김일규,김형찬,강미정,손송이,이후장,Park, Seung-Hyu,Kim, Il-Gyue,Kim, Hyung-Chan,Gang, Mi-Jeong,Son, Song-Ee,Lee, Hu-Jang 대한수의학회 2015 大韓獸醫學會誌 Vol.55 No.2
In the present study, the effects of different photoperiods on stress, immunity, and hematological parameters in ICR mice were evaluated. Fifty male ICR mice 7 weeks old (body weight, $27.3{\pm}2.5g$) were divided into five groups: DP-0 (0/24-h light/dark cycle), DP-6 (6/18-h light/dark cycle), DP-12 (12/12-h light/dark cycle), DP-18 (18/6-h light/dark cycle), and DP-24 (24/0-h light/dark cycle). During the experimental period, no significant differences in body weight or feed intake were observed between the groups. Hematological analysis revealed that white blood cell, red blood cell, and hemoglobin values for the DP-0 group were significantly different compared to those of the other groups. After 28 days, no significant difference in serum cortisol concentration was observed among the groups, but serum cortisol levels increased in a light exposure-dependent manner. Total serum immunoglobulin G (IgG) concentrations of the DP-0 and PD-6 groups were significantly increased compared to those of the other groups (p < 0.05), and serum total IgG levels decreased in a light exposure-dependent manner. Results of the present study indicated that various photoperiods affect hematological parameters and total serum IgG levels in ICR mice while having no significant effects on body weight, feed intake, or cortisol levels.
채원석(Won-Seok Chae),박은기(Eun-Kee Park),박광일(Kwang-Il Park),김석(Suk Kim),이후장(Hu-Jang Lee) 한국예방수의학회 2021 예방수의학회지 Vol.45 No.4
This study compared the immune responses, stress relief and weight gains of needle or needle-free intramuscular and needle-free intradermal vaccination in pigs. When the same amount of a foot-and-mouth disease (FMD) vaccine was administered to pigs, antibody titers at 4 weeks after the 1st and 2nd FMD vaccination were not significantly different between the needle (IM-S) and needle-free (NM-P250) intramuscularly vaccinated groups, but the weight gain of NM-P250 was significantly increased compared to that of IM-S at 8 weeks after the 2nd FMD vaccination (p<0.05). In addition, serum cortisol concentrations of NM-P250 were considerably decreased compared to those of IM-S on the 5th and 7th day after the 1st and 2nd FMD vaccination (p<0.05). However, the antibody titers of IM-S vaccinated with 2 mL of FMD vaccine were significantly increased compared to those of the needle-free intradermal vaccinated group with 0.5 mL of FMD vaccine at 4 weeks after the 1st and 2nd FMD vaccination (p<0.05). In conclusion, the needle-free intramuscular injection for the FMD vaccination can be chosen for weight gain and stress relief in pigs.
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.
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.
3,3`,4,4`,5-pentachlorobiphenyl (PCB126)이 Sprague-Dawley랫드의 proteome 발현에 미치는 영향
한대용 ( Dae Yong Han ),강상림 ( Sang Rim Kang ),박현수 ( Hyeon Soo Park ),박광일 ( Kwang Il Park ),원청길 ( Chung Kil Won ),조재현 ( Jae Hyeon Cho ),김석 ( Suk Kim ),이후장 ( Hu Jang Lee ),김은희 ( Eun Hee Kim ),김곤섭 ( Gon Sup 한국수의공중보건학회 2008 예방수의학회지 Vol.32 No.3
철원북방 DMZ 내의 중영양호 토교저수지의 생태학적 연구 5. 경안천 ( 팔당호 ) 과 토교저수지에서 식물플랑크톤의 크기별 현존량과 Chlorophyll α 의 계절 변동
한명수(Myung Soo Han),최영길(Yong Keel Choi),김세화(Se Wha Kim),이경(Kyung Lee),유광일(Kwang Il Yoo),이후랑(Hu Rang Lee),홍성수(Sung Su Hong),김영옥(Young Ok Kim) 한국환경생물학회 2002 환경생물 : 환경생물학회지 Vol.20 No.1
N/A With physico-chemical environmental factors such as temperature, DO, pH, conductivity and nutrients, size fractionated of phytoplankton standing crops and chlorophyll α concentrations(>8㎛, 3∼8㎛ and <3㎛) and their relationships were investigated at each station of Kyungan Stream and Togyo Reservoir from April to November in 1997. The two sampling sites showed different nutrient status: Kyungan Stream was eutrophic, while Togyo Reservoir was mesotrophic. Large sizes of phytoplankton and chl. α were higher in Kyungan Stream, opposite to those of Togyo Reservoir; Standing crops of phytoplankton(>8㎛) and chl. α(3∼8㎛) were high in Kyungan Stream, while phytoplankton(3∼8㎛) and chl. α(<3㎛) were abundant in Togyo Reservoir. These results imply that phytoplankton community in the highly eutrophicated water mainly comprised the large filamentous and/or colonial algae, such as Microcystis spp. and Aphanizomenon flos-aquae, which easily enriched by nutrients loading.