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c-형강 및 ebb & flow 방식에 따른 경제성 분석
강승원(Seung Won Kang),박천호(Chun Ho Pak),조용성(Yong Sung Cho) 한국원예학회 2007 원예과학기술지 Vol.25 No.3
관비재배와 저면관수인 ebb & flow, C-형강의 재배방식에 따른 고품질분화 생산을 위한 재배농가의 경제성을 분석하였다. 이를 위해 화훼농가의 비용구조를 분석하였고 자본 회수기간 및 내부수익률의 추정, 관수에 따른 인건비 절감 효과를 분석하여 재배방식에 따른 경제성을 비교하였다. 10a(991.7m²) 규모의 자동온실에 대해 관비재배방식을 선택한 시클라멘 재배농가의 총 비용은 9,993.8만원으로 추정되며, 이 중 시설비는 74%(7,410만원)를 점하고 연간 2,583.8만원의 경영비를 지출할 것으로 예상된다. 반면, C-형강방식을 선택한 재배농가는 초기 시설비용으로 약 8,520.0만원(총비용의 약 70%)을 지출하고, 매년 경영비로 3,597.0만원을 지출할 것으로 추정된다. 한편, 투자자금에 대한 자본회수 기간을 분석한 결과 10a 규모의 자동온실에서 시클라멘을 재배하는 농가에서 관비재배방식 혹은 C-형강방식을 선택할 경우에는 초기시설투자비 회수기간이 약 4 년 정도 소요될 것으로 예측되며, ebb & flow 방식을 선택할 경우에는 약 5년 정도의 시간이 소요될 것으로 예상된다. 또한, 내부 수익률을 추정한 결과 ebb & flow시설과 C-형강시설을 5년과 6년씩 사용한다고 가정할 경우, ebb & flow시설의 내부 수익률은 각각 9%와 14%로 나타났고, C-형강시설의 경우에는 각각 13%와 17%로 나타나 시중의 저축성예금 수신금리 4.82%와 비교하여 경제성이 높은 것으로 분석되었다. Economical efficiency for production of high quality-potted plants was analyzed by types of irrigation system such as conventional fertigation, ebb & flow, and C-channel as subirrigation systems. After cost structure was analyzed, payback period of capital, internal rate return (IRR), and effects of reduced labor cost were estimated. The gross cost of cyclamen-producing farmers using hydroponic systems in automated greenhouses (10a) was about 100 million won. Of the gross cost, installation and operation costs occupied 74% and 25%, respectively. In the C-channel subirrigation system, gross cost was 120 million won approximately. Installation and operation costs occupied 70% and 30%, respectively. Payback period of capital was 4 years for fertigated irrigation and C-channel subirrigation system, whereas it was 5 years for ebb & flow. IRR of ebb & flow and C-channel subirrigation systems was higher than the interest rates of 4.82%, indicating economic efficiency.
Seung Won Kang(강승원),Sang Gyu Seo(서상규),Chun Ho Pak(박천호) 한국원예학회 2009 원예과학기술지 Vol.27 No.1
C-형강 심지관수 시스템을 이용한 분화재배 시 모세관 심지의 폭과 형강 내 수분의 높이가 국화(Dendranthema grandiflorum ‘Lompoc’)와 포인세티아(Euphorbia pulcherrima ‘Cortez’)의 생장 및 생육과 배지의 수분 흡수특성에 미치는 영향을 구명하기 위해 본 실험을 수행하였다. 수분 흡수 특성의 연구결과, 심지의 폭이 넓을수록, 형강 내의 수분함량이 높을수록 배지의 수분함량이 증가하였다. 배지의 수분함량 증가는 심지의 폭과 형강 내 수분 높이와 상관없이 수분 공급 후 24시간 이내에 수분흡수량이 급격히 증가하였고, 그 이후부터는 완만한 수분 흡수특성을 나타내었다. 국화 및 포인세티아 재배실험의 경우, 중간의 수분높이(3.0㎝)와 1.5cm의 심지폭 처리구가 국화 재배 시 최적의 조합으로 나타났으며, 포인세티아는 고 수분높이(4.3㎝)와 1.5㎝의 심지폭 조합에서 생육이 좋은 것으로 나타났다. C-형강 심지관수 시스템을 이용한 본 실험을 통하여, 분화용 국화는 중간 높이의 양수분 높이에서, 포인세티아는 고 수분 높이의 양수분 공급이 필요한 것으로 나타났으면, 따라서 형강 내 양수분 높이의 조절을 통하여 고품질의 소현 분화생산이 가능하리라 판단된다. 이 시스템을 통하여 수분 및 양분이용의 효율성을 높일 수 있고, 생산비용을 절감할 수 있을 것이라 생각하며, 이로 인하여 생산 경영의 효율성을 높여줄 것이라 생각한다. This experiment was conducted to investigate water absorption properties of growing media and growth and development of chrysanthemum (Dendranthema grandiflorum ‘Lompoc’) and poinsettia (Euphorbia pulcherrima ‘Cortez’) as affected by water levels in channel and the width of capillary wicks in C-channel wick irrigation system. In the study of water absorption properties, the water content was increased as the wick width and water level increased. Irrespective of capillary wick width and water level in channel, the capillary subirrigation system showing rapid water absorption was observed within 24-hours, followed by gradual increase thereafter. Treatment with medium water level (3.0 ㎝) and a wick width of 1.5 ㎝ was the best for the chrysanthemum whereas the treatment with full water level (4.3 ㎝) and a wick width of 1.5 ㎝ was the best for the poinsettia. In this experiment using C-channel wick irrigation system, supplying nutrient solution in medium level produced optimum growth for chrysanthemum, whereas full level supplement was needed for poinsettia. C-channel subirrigation system with suitable height control regime is expected to be suitable for small pot plants with high quality. This system could improve the efficiency of water and fertilizer use and reduce the cost. It also would be effective for management.
부루세라백신(RB51)의 안전성에 관한 연구 I. Brucella abortus RB51 백신균주의 생화학적 및 유전학적 성상비교
김종만,우승룡,이지연,정석찬,강승원,김종염,윤용덕,조상래,유한상,Kim, Jong-man,Woo, Sung-ryong,Lee, Ji-youn,Jung, Suk-chan,Kang, Seung-won,Kim, Jong-yeom,Yoon, Yong-dhuk,Cho, Sang-nae,Yoo, Han-sang,Olsen, Steven C. 대한수의학회 2000 大韓獸醫學會誌 Vol.40 No.3
Biochemical and genetic analysis were carried out to investigate the potential recovery of pathogenecity or related mutations of Brucella abortus RB51 vaccine strains. RB51 strains were recovered from commercial vaccines, including related seed stocks from private companies in Republic of Korea, strain from USA, a reference strain from C university and a field isolate (Daehungjin) from aborted dairy cow after RB51 vaccination were compared with two identified virulent wild strains (S2308 and a field strain isolated from dairy cow in Korea) at the same conditions. All the strains examined, except identified pathogenic strains, revealed the identical characteristics to the original RB51 in biochemical properties, antigen and bacteriophage typing. Outer membrane protein (OMP) profiles from strains of RB51 showed the same patterns with standard RB51 in SDS-PAGE. In addition, Western blotting with the brucella specific monoclonal antibody also indicated that all the vaccine strains were completely deficient in their LPS compared to the pathogenic Br abortus strains. The differences in DNA structures among strains were also possible to detect after PCR. All vaccine strains, except S19, S1119-3, S1075, S544 and Br suis, were amplified a 178bp DNA fragment of eri-gene, and 364bp of IS711 elements. In contrast, 498bp DNA product was only found with Br abortus. Overall evidences in the present study confirmed that the RB51 strains for vaccine production in Korea did not originated from the phenomena of possible recovery of pathogenicity or related to any potential mutation event at all.
착유우의 톱밥발효우사 이용연구 제 1 보 : 낙농가의 톱밥발효우사 형태별 이용효과 비교
권두중,권응기,기광석,이기종,한정대,정석찬,강승원,강상열,정형섭,장학주,Kweon, Du-Jung,Kweon, Ung-Gi,Ki, Wang-Seok,Lee, Kee-Jong,Han, Jeong-Dae,Jung, Suk-Chan,Kang, Seung-Won,Kang, Sang-Lyol,Jung, Hyoung-Sup,Chang, Hak-Joo 한국축산환경학회 1995 축산시설환경학회지 Vol.1 No.1
This study was carried out to investigate the effect of sawdust bedding barn on manure handing, management labour and physiological aspect of dairy cows, and then to establish the criteria on the optimum utilization method of sawdust bedding barn. 46 tie stall barns and 49 sawdust bedding barns were surveyed to cmopare the milk productivity between two different barns, and also 5 tie stall barns, 15 sawdust bedding barns and 1 rice hull bedding barn were selected to study the utilization situation of sawdust barn in Kyung-Ki province area. The major results obtained were as follows; 1. The roof material of sawdust barn were consisted of 66% vinyl house, 23% PVC light and 11% slate and galvanum coated tin. Most of the floor structure was earth ground with the rate of the approximately 82%. 2. The average occupied area of sawdust bed per cow was 15.2 $m^2$, depth that 30 cm and the utilization period was 12 months. 3. Milk Yield was significantly higher at sawdust barn than at tie stall barn(P<0.01). Bacterial and somatic cell count in raw milk were less at the sawdust barn than in tie stall barn. However, there was not significance difference between two barns. 4. The labour hour needed to cow management in the sawdust barn was approximately 48% of that of tie stall barn. 5. The temperature and moisture content measured in sawdust bed were closely affected by seasonal ambient temperature. The skin and hair of cow were much cleaner at the PVC light roofed sawdust barn than any other roof materials. 6. The additives used for improving of fermentation did not show any effect on temperature and moisture content in sawdust bed. When the ambient temperature was $30.4^{\circ}C$, the surface temperature of measured 1 cm above the sawdust bed was $12.2^{\circ}C$ lower and the temperature of 100 cm above the sawdust bed was $2.4^{\circ}C lower under shading net facility than that of vinyl roofed one.7. The hoof length of miking cow was 7.95 cm in tie stall and 9.19 cm in sawdust barn with high significance (P<0.01). And disease occurence such as mastitis and foot-rot tended to decrease in the sawdust barn. 8. The number of total bacteria and coliform bacteria were less in the sawdust bed compared with earth ground resting area. And a parasite strongyloides papillosus was detected but without any infected cow. 9. The nitrate($NO_3N$) content in non-roofed earth ground resting area and earth ground under the sawdust bed was likely to pollute the ground water. 10. In economic point of view, rice hull bedding barn was the cheapest among different systems. And in the sawdust bedding barn PVC light + slate roofed barn was most desirable, and vinyl roofed one the least.