• 한국원자력학회:학술대회논문집
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• 한국원자력학회 2001년도 추계학술발표회요약집
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• pp.175.2-175
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• 2001

• 한국초지조사료학회지
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• 제30권2호
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• pp.159-168
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• 2010

본 연구는 부산물 혼합 silage 사료 급여가 한우 비육전기 거세우의 채식 및 반추행동에 미치는 영향을 규명하기 위하여 실시하였다. 시험에 사용한 공시한우는 21개월령 총 12두를 3처리로 배치하였으며, 이 때 처리구는 관행구 (C구: 농후사료+ 볏짚 자유채식)와 부산물 혼합 silage 구를 2처리 (T1: 농후사료+부산물 혼합 silage 제한급여 (1 kg) + 볏짚 자유채식, T2: 농후사료+부산물 혼합 silage 자유채식)로 하여 48시간 행동관찰을 실시하였다. 총 건물 섭취량은 T1 > C > T2구 순으로 나타났으나 상호간 유의적 차이는 없었다. 채식시간과 저작시간은 C구가 다른 구에 비하여 유의적으로 높게 나타났다 (p<0.05). 반추시간과 휴식시간은 처리구들 사이에 유의적 차이를 보이지 않았으며, 식괴수, 총저작수 및 식괴 당 저작수에 있어서도 같은 경향을 보였다. 그러나 식괴 당 반추시간과 FVI (feed value index)는 C구가 T1 및 T2구에 비하여 유의적으로 높게 나타났다 (p<0.01, 0.05). 분 당 식괴수는 T1구에서 높게 나타났으며 (p<0.01), 음수 회수는 T2구에서 유의적으로 높게 나타났다 (p<0.05). 배분 및 배뇨 회수에 있어서는 처리구들 간에 유의적인 차이를 보이지 않았다. 채식율에 있어서는 T2구가 다른 구에 비하여 유의적으로 높게 나타났으나 (p<0.05), 반추효율 및 저작효율에 있어서는 처리구들 사이에 유의적인 차이를 보이지 않았다. 이상의 결과로 볼 때, 부산물 혼합 silage는 볏짚과 비교시 반추행동상 큰 문제가 없기 때문에 차후 볏짚 대용으로 활용가치가 높을 것으로 사료된다.

• Asian-Australasian Journal of Animal Sciences
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• 제30권6호
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• pp.902-906
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• 2017

Objective: This study was conducted to characterize the behaviors and the body weight of suckling piglets in different social environments. Methods: Two groups of sows and suckling piglets housed either in individual farrowing crates in separate pens ($1.8{\times}2.4m$, the control group) or in groups of three sows with their piglets in farrowing crates in a large common enclosure ($5.4{\times}2.2m$, the treatment group) were observed with the aid of video technology for 9 consecutive hours on days 1, 2, and 3, after mixing. Results: Suckling, agonistic, and elimination behaviors of suckling piglets were significantly higher in the control group than in the treatment group. Inactive behavior was higher in the treatment group than in the control group. Most of the effects of the social environment on the suckling piglets seem to be the result of large reductions in behaviors and body weight for piglets switching from high activity to low activity. Moreover, suckling behavior and birth body weight were highly correlated with body weight at the end of the test. Conclusion: The social environment that resulted from mixing, thus, had significant effects on the behavior and body weight of suckling piglets, and behavioral characteristics, therefore, should be considered when making improvements to the husbandry and care methods used in swine production.

• 대한기계학회논문집B
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• 제39권3호
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• pp.237-243
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• 2015

본 논문은 에멀젼연료(Diesel/$H_2O_2$)에 있어 과산화수소의 혼합비가 혼합연료 액적증발 및 분무거동 특성에 미치는 영향을 연구하였다. 연료혼합을 위한 계면활성제는 span 80, tween 80을 9:1로 혼합하여 에멀젼연료 총 부피의 3%로 고정 혼합하였다. 또한 과산화수소의 혼합비율은 계면활성제의 혼합비를 고려하여 EF (Emulsified Fuel)0, EF2, EF12, EF22, EF32 및 EF42로 설정하였다. 에멀젼연료 액적의 증발특성을 관찰하기 위해 가열판에 액적 방울을 투하시켜 액적이 증발하는 현상을 산란광 및 쉴리렌기법을 통하여 촬영하였다. 또한 혼합비 변화에 따른 혼합연료의 분무거동특성을 해석하기 위하여 혼합연료 EF0~EF22를 선택하여 $150^{\circ}C$로 유지된 정적용기에서 증발자유분무 거동해석 실험을 실시하였다. 그 결과 과산화수소의 혼합비율이 EF0보다 높은 EF22 에멀젼연료의 자유분무성장이 연료 속에 혼합된 과산화수소의 증발촉진으로 인하여 보다 신속하였다.

• 보존과학회지
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• 제36권6호
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• pp.456-474
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• 2020

본 연구는 문화재 보수에 사용되는 소괴 소석회, 분말 소석회, 시판 소석회를 대상으로 배합비에 따른 석회 모르타르의 유동성, 응결시간 및 수축율을 비교하였다. 유동성 시험 결과, 문화재 조적용 석회 모르타르의 최적 배합수 비율은 소괴 소석회 8~10%, 분말 소석회 10~18%, 시판 소석회 17~40%의 범위로 나타났다. 응결시간과 수축율 분석 결과, 문화재수리표준품셈에 기술된 전돌벽쌓기(습식) 대비 종결시간비는 시판 소석회(0.4) < 분말 소석회(5.6) < 소괴 소석회(5.7)의 순으로, 수축율비는 소괴 소석회(1.1) < 분말 소석회(1.2) < 시판 소석회(3.0)의 순으로 나타났다. 물리·화학적 특성 분석 결과, 소석회의 입자크기가 커질수록 최적 배합수 함량은 낮아졌고 응결시간은 지연되며 수축율은 감소하였다. 이와 같은 결과는 향후 건축문화재의 수리·복원 현장에 사용되는 석회 모르타르의 초기거동과 수축특성을 예측하는데 기여할 것으로 판단된다.

• Water Engineering Research
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• 제4권2호
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• pp.69-85
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• 2003

Previously developed empirical equations used to calculate the parameters of the transient storage model are analyzed in depth in order to evaluate their behavior in representing solute transport in the natural streams with storage zone. A comparative analysis of the existing theoretical and experimental equations used to predict parameters of the transient storage (TS) model is reported. New simplified equations for predicting 4 key parameters of the TS model using hydraulic data sets that are easily obtained in the natural streams are also developed. The weighted one-step Huber method, which is one of the nonlinear multi-regression methods, is applied to derive new parameters equation. These equations are proven to be superior in explaining mixing characteristics of natural streams with the transient storage zone more precisely than the other existing equations.

• 한국안전학회지
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• 제18권1호
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• pp.76-80
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• 2003

There will be a big problem in disposing of waste tie coming from the cars. Because many of these have been thrown away to the field and environmentally polluted. New, We need to find out how to dispose or recycle these waste material. It is thought that recycling this material especially mixing with concrete will be a good idea. This study is focused how each material do its behavior due to the size of waste type particle and its amount into concrete material. 0.4mm-10mm range of particle has been applied to the material : Also, 1.0%, 1.5%, 2.0% range of tyre particle proportion has been applied to make cylinder molds. The concrete mold with waste-tyre particle has vibration-absorbing ability. It is found that 0.4 -0.6mm particle mixing concrete has been more solid organized. And this waste tyre material could be applied to the general concrete, it is found.

• 한국염색가공학회지
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• 제9권1호
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• pp.23-32
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• 1997

Composite membranes having different mixing ratio of Wool(SCMK) and poly(ethylene terephthalate) (PET) were prepared by dissolving wool/PET in hexafluoro-2-propanol(HFIP), casting the obtained solution on a glass plate and evaporation the solvent in the presence and absence of an electric field. The internal structure of the prepared membrane was investigated using polarise microscope dyeing and dye permeation method. In the composite membrane prepared under electric field, both components were micro mixing, while in the membranes prepared under nonelectric field, the two components formed a random sea/island structure according to different mixing ratio. Such characteristic membrane structure was influenced the permeation behavior of C.I. Acid Red 118 through the membranes from an aqueous solution.

• Geomechanics and Engineering
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• 제8권3호
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• pp.361-375
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• 2015

Constructions over soft and loose soils are one of the most frequent problems in many parts of the world. Cement and cement-lime mixture have been widely used for decades to improve the strength of these soils with the deep soil mixing method. In this study, to investigate the freeze-thaw effect of sand improved by polymers (i.e., styrene-acrylic-copolymer-SACP, polyvinyl acetate-PVAc and xanthan gum) and fly ash, unconfined compression tests were performed on specimens which were exposed to freeze-thaw cycles and on specimens which were not exposed to freeze-thaw cycles. The laboratory test results concluded that the unconfined compressive strength increased with the increase of polymer ratio and curing time, whereas, the changes on unconfined compressive strength with increase of freeze-thaw cycles were insignificant. The overall evaluation of results has revealed that polymers containing fly ash is a good promise and potential as a candidate for deep soil mixing application.

• 한국해양공학회지
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• 제20권1호
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• pp.7-15
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• 2006

In this research, the behavior characteristics of cement mixing lightweight soil (CMLS) for recycling of dredged soil in the Nakdong River estuary are experimentally investigated. CMLS is composed of the dredged soil from Nakdong River estuary, cement, and air foam. For this purpose, uniaxial compression tests are carried out for artificially prepared specimens of CMLS, with various initial water contents, cement contents, and mixing ratio of dredged soils. The experimental results of CMLS indicated that the compressive strength is strongly influenced by the cement contents, rather than water contents and air foam. Compressive strength of CMLS increased with an increase in cement content, while it decreased with an increase in water content and air foam content. It was also found that the modulus of deformation E50 was in a range of 44 to 128 times greater than the value of uniaxial compressive strength, cured in 28 days.