• 한국초지조사료학회지
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• 제9권1호
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• pp.56-61
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• 1989

本 연구는 濟州道內 放救用 野草地(마을共同收場)에서 野草類의 植生 및 收量性을 조사하여 草地改良 및 野草地의 利用度 增進을 위한 基鍵資料로 活用코자 放牧期間인 7 月부터 9 月까지 수행되었으며 quadrat method를 利用하여 조사한 結果는 다음과 같다. 1. 野草의 總草種은 64種으로 未本科 13草種, 두과 8草種, 엉거시科 12草種, 그리고 기타 31草 종으로 대부분 多年生 草類였다. 2.. 식생적性率은 띠 (Imperata cylindrica) 32.7%, 고사리 (Pteridium aquilinum) 18.9%, 억새 (Miscanthus sinensis) 8.4% 順이었고, 科別로는 未本科草種이 47.5%를 차지하였다. 3. 野草地의 l0a當 乾物收量은 7月이 160kg, 8月이 200-400kg, 9月 이 400-1,000kg으로 평균收量은 383 kg였으며, 生草收量은 평균 1,030kg으로 生育이 進行되면서 점차 증가하였다.

• 한국초지조사료학회지
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• 제13권3호
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• pp.184-189
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• 1993

수확시기와 칼륨비료의 시용수준이 각각 다른 오차드그라스(Dactylis glomerata L.)를 대사시험용 케이지 안의 염소(산양)에게 급여하여 목초중 무기질함량이 염소의 무기물질 출납에 어떤 영향을 주는가를 알아보고자 본 실험을 실시하였다. 저칼륨급여구의 오차드그라스 건초중 칼륨과 마그네슘함량은 건물량 기준으로 각각 3.4%와0.26%이었고 중칼륨구의 함량은 4.9%와0.21%이었으며 고 칼륨구의 함량은 5.8%와0.21% 이었다. 고칼륨급여구에서 뇨중칼륨배설량은 저칼륨구보다 유의하게 많았고, 저칼륨구의 분중및 뇨중 마그네슘배설량은 중칼륨구 및 고 칼륨구보다 많았다. 뇨중마그네슘배설량은 혈장의 마그네슘농도 정상관의 경향이 있었으며, 고칼륨급여구의 염소(산양)는 다름 급여구에 비해 음수량과 배뇨량이 많은 경향이었다.

• 한국임상수의학회지
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• 제22권2호
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• pp.108-113
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• 2005

This study was performed to investigate the growth rate, hematological and serological changes of the rats when they were fed with the high fat diets supplemented with or without the tannic acid for five weeks. Thirty-two Sprague-Dawley male rats(235.7\pm10.7g\;of\;body\;weight)$ were randomly divided into four groups, control group and three treatment groups(T1, T2 and T3). Rats in control group were fed with the high fat diet containing $15\%\;lard,\;1\%$ cholesterol and $0.5\%$ sodium cholate(wt/wt) which was modified from the formula of American Institute of Nutrition (AIN)-76 diet and rats in treatment groups were fed with above diet supplemented with $0.25\%(T1),\;0.5\%(T2)$ or $0.75\%(T3)$ of tannic acid(wt/wt), respectively. The supplementation of tannic acid(TA) did not affect the final body weight, gain of body weight and feed intake of rats in both control and treatment groups. The numbers of red blood cells, hemoglobin concentrations and hematocrit values in blood of rats showed no significant differences between control group and treatment groups. The glucose concentration and albumin/globulin(A/G) ratio of rats in treatment groups were slightly lower than that of control group without significance. The values of total protein, albumin and globulin showed no significant differences between control group and treatment groups. The values of total cholesterol, low density lipoprotein­cholesterol and atherogenic index in sera of rats in treatment groups were much lower than that of control group without significance. The values of triglycerides in sera of rats in T3 group were significantly lower than that of control group (p<0.05). The values of AST and ALT in sera of rats in T3 group were significantly lower than that of control group (p<0.05). Thus supplementation of tannic acid to high fat diet could be effective to reduce the serum lipid levels such as total cholesterol, high density lipoprotein-cholesterol and triglycerides which were regarded as to cause the cardiovascular diseases.

• 한국수산과학회지
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• 제36권6호
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• pp.586-590
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• 2003

The effect of water temperature and feed on the growth, survival, and body composition of juvenile abalone (Haliotis discus hannai) fed an artificial formulated diet and a macroalgae (Laminaria japonica) for 12 weeks was investigated. Rearing temperature was maintained at $13{\circ}C,\;16{\circ}C,\;19{\circ}C$ by heated and natural sea water temperatures $(7.5-10.2{\circ}C).$ Shell growth, weight gain, and survival rate of the abalone were affected by water temperature and diet (P<0.05). Survival and growth rate of the abalone fed with the formulated diet and Laminaria at $19{\circ}C$ was significantly higher than those of the abalone fed the formulated diet or Laminaria at $13{\circ}C,\;16{\circ}C,$ and ambient temperatures (P<0.05). Moisture, crude protein, crude lipid, and ash contents of the soft whole body were affected mainly by diet than rearing water temperature (P<0.05). These indicate that a mixture of formulated diet and macroalgae could improve the growth of the abalone independent of water temperature and heated water could improve the growth of abalone during the winter season.

• 한국식품위생안전성학회지
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• 제21권4호
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• pp.258-262
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• 2006

환경호르몬 물질의 생체내에서의 상호작용에 의한 상자 또는 상승 작용을 알아보기 위하여 환경호르몬 물질들을 조합하여 마우스에 처치한 후 생체내에서 생식기의 변화 정도를 조직병리학적으로 관찰하였다. 암컷 ICR마우스에 난소적출술을 실시하고 2주 후에 DEHP, DBP, BPA의 환경호르몬 물질을 단독 또는 두개씩 조합하여 마우스에 피하로 주입하였다. 육안적인 변화에서는 모든 군에서 이상이 관찰 되지 않았으며, 부검 후 자궁의 무게를 측정한 결과에 있어서도 유의적인 변화를 관찰할 수 없었으나, 자궁 내 fluid존재에 있어서는 E2 단독 투여 군과 E2와 함께 투여한 모든 그룹(E2+DEHP, E2+DBP, E2+BPA)에서 관찰되었다. 조직병리학적인 관찰에 있어서는.자궁상피세포, 질 상피세포, 유선의 변화 그리고 난관 직경의 변화를 관찰하였다. 그 결과 민감도에 있어서 가장 유의적인 변화를 보인 항목은 질 상피세포의 변화였으며, 환경호르몬 물질을 두개씩 혼합하여 처치한 그룹에 있어 단독으로 처치한 그룹과 비교 시 변화의 정도가 심한 것이 일부 관찰 되었으나 통계학적으로 유의성을 가지고 있다고 결론을 내리기 는 힘들었다. 결론적으로 환경호르몬물질간의 생체내에서 상가 혹은 상승작용에 대한 명확한 결과는 도출할 수 없었으나, 환경호르몬물질이 생체내 작용하는 데에 있어서 서로 간에 상승작용을 할 수 있다는 가능성은 충분한 것으로 판단되어진다.

• Nuclear Engineering and Technology
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• 제53권10호
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• pp.3275-3285
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• 2021

A Nuclear Power Plant (NPP) is a complex dynamic system-of-systems with highly nonlinear behaviors. In order to control the plant operation under both normal and abnormal conditions, the different systems in NPPs (e.g., the reactor core components, primary and secondary coolant systems) are usually monitored continuously, resulting in very large amounts of data. This situation makes it possible to integrate relevant qualitative and quantitative knowledge with artificial intelligence techniques to provide faster and more accurate behavior predictions, leading to more rapid decisions, based on actual NPP operation data. Data-driven models (DDM) rely on artificial intelligence to learn autonomously based on patterns in data, and they represent alternatives to physics-based models that typically require significant computational resources and might not fully represent the actual operation conditions of an NPP. In this study, a feed-forward backpropagation artificial neural network (ANN) model was trained to simulate the interaction between the reactor core and the primary and secondary coolant systems in a pressurized water reactor. The transients used for model training included perturbations in reactivity, steam valve coefficient, reactor core inlet temperature, and steam generator inlet temperature. Uncertainties of the plant physical parameters and operating conditions were also incorporated in these transients. Eight training functions were adopted during the training stage to develop the most efficient network. The developed ANN model predictions were subsequently tested successfully considering different new transients. Overall, through prompt prediction of NPP behavior under different transients, the study aims at demonstrating the potential of artificial intelligence to empower rapid emergency response planning and risk mitigation strategies.

• Journal of Applied Biological Chemistry
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• 제62권1호
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• pp.1-6
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• 2019

Flavonoid인 isokaempferide는 간 보호, 항균, 항증식성, 항염 등 다양한 생리활성을 가지는 것을 보고 되고 있으며 Amburana cearensis와 Cirsium rivulare (Jacq.)과 같은 식물에서 추출하여 사용한다. 생물전환은 비교적 값이 싼 물질로부터 고부가가치 물질을 얻기 위한 방법으로 유용물질의 식물추출법을 대체할 수 있는 방법이다. Naringenin으로부터 isokaempferide를 생합성 하기 위해 대장균에 포플러에서 분리한 PFLS와 벼에서 분리한 ROMT-9 유전자를 도입하였다. 이 균주를 이용하여 naringenin으로부터 isokaempferide의 생합성 수율(9.8 mg/L)은 낮았다. Isokaempferide의 생합성 수율을 높이기 위해 S-adenosylmethionine (SAM) 생합성 경로의 transcriptional regulator인 MetJ를 제거함으로써 methyl donor로 사용되는 SAM을 증가시켰다. SAM생합성 대사를 조절한 대장균을 이용하여 생물전환 균주의 최적 세포밀도 및 최적의 기질공급 농도를 결정하였다. 최적화된 조건을 이용하여 isokaempferide의 생합성은 87 mg/L까지 증가하였다.

• 농촌계획
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• 제25권2호
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• pp.99-117
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• 2019

Environmental impact assessment (EIA), which predicts, evaluates, and manages the influences on natural landscape, plays a role of monitoring natural resources for systematic management of natural landscape. However, the function of verification and correction of the system is still insufficient and feed-back, one of the most important features of EIA follow-up, has not been introduced in Korea's EIA system yet. As a procedure, it is required to check if the opinions of the evaluators are properly reflected to the outcomes of the project through a reviewing process after assessing environmental impacts of a development project. In reality, despite the awareness about the importance of follow-up inspection of the conformity with, the system mainly focuses on the agreement during the planning stage of the development project and fails to continuously manage after its completion. There have been various preceding studies related to prediction, evaluation, and management of environmental impacts on natural landscape for better management. They primarily dealt with the problems in the EIA process and suggested improvement measures, including directions for institutional development, step-by-step goals, and operation methods, to address the problems which arise in the EIA follow-up process. However, suggested measures are not actively applied with the focus only put on institutional operation, there are virtually no standardized methods to predict and assess landscape changes due to the development project and to manage landscape after the project. Against this backdrop, this study aims to explore the existing methods to analyze the impacts natural landscape and to establish a system where landscape management is continued after the development project. To this end, we will suggest reducing methods according to the predicted changes in landscape for post-project management of natural landscape. Characteristics of reduction methods by project type were examined through reviewing the guide to natural landscape rating and the importance of development project impacts on natural landscape by type of reduction was evaluated through questionnaire for experts. Evaluated types of reduction are classified and presented by characteristics of each development project and content of reduction type.

• Journal of Animal Science and Technology
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• 제63권5호
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• pp.998-1007
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• 2021

Brine mineral water (BMW) is groundwater near the deep sea, and the mineral component of the BMW is different from the water of the deep sea because the components of BMW are derived from the unique geographical features surrounding it. Recently, BMW has attracted attention due to the unique health-related minerals it possesses; however, the influence of BMW on physiological function has not yet been determined in domestic animals. Therefore, this experiment investigated the influence of BMW on the growth performance, water intake, blood properties, and immunoglobulin (Ig) levels of serum in growing-finishing pigs. A total of 64 pig barrows (Landrace × Yorkshire × Duroc) with an average initial weight of 40.56 ± 0.17 kg were used in the experiment, and 0%, 2%, 3%, and 5% samples of BMW diluted with freshwater were provided to experimental animals during the 56 days. We found that the gain/feed ratio in the 3% BMW group was significantly higher than that in the 5% BMW group of growing-finishing pigs (p < 0.05). The water intake was significantly increased in the 5% BMW group compared with the other groups (p < 0.05) of growing-finishing pigs. Additionally, the concentrations of red blood cells (RBCs), hemoglobin (HGB), and hematocrit (HCT) were significantly higher in the 3% BMW group than in the control group. The level of high-density lipoprotein cholesterol was higher in the 3% BMW group than in the 5% BMW group (p < 0.05). Furthermore, IgG and IgM levels in the serum were significantly higher in the 2% and 3% BMW groups than in the control group (p < 0.05). These results suggest that a dilution of 3% BMW in the intake water could improve the levels of RBCs and serum Igs in growing-finishing pigs.