• 한국작물학회지
• /
• 제41권6호
• /
• pp.729-735
• /
• 1996

동진벼의 현미에서 캘러스를 유도하여 증식할 경우 Ge첨가가 캘러스 내의 Ge함량에 미치는 영향을 검토한 결과는 다음과 같다. 배지별 Ge농도에 따른 캘러스 증식율과 캘러스내 Ge 및 무기원소의 함량은 N$_{6}$배지보다는 MS배지에서 캘러스증식이 좋았으며, 캘러스 내 K함량을 제외하고는 Ge 및 기타 무기원소의 함량이 대체로 높았다. N$_{6}$배지와 MS배지 내 Ge농도가 높을수록 캘러스 증식율은 감소되나 캘러스 내 Ge함량은 증가되었고 Ca, Mg, K의 함량은 감소되며 Fe, Mn, Zn, Cu의 함량 등은 Ge농도 100～200 mg/$\ell$까지는 증가되나 그 이상 농도에서는 감소되는 경향이었다. Ge의 종류 및 농도에 따른 캘러스 내 Ge함량은 처리 한 Ge농도가 높을수록 증가되었는데, Ge 시용량이 100 mg/$\ell$ 이하에서는 무기ee(GeOf) 처리가 유기Ge(Ge-132) 처리보다 캘러스 내 Ge함 량이 높았으나, 그 이상의 농도에서는 유기 Ge처리가 무기Ge처리보다 캘러스 내 Ge함량이 높았고 캘러스 활력도 좋았다. 배지의 pH가 낮을수록 캘러스의 활력은 떨어지나 캘러스 내 Ge함량은 높았으며, citric acid 와 myo-inositol의 0.1～l.0 mM을 배지에 처리한 경우 무시용보다 캘러스 생육이나 캘러스 내Ge 및 기타 무기원소의 함량이 증가되었는데, citric acid보다는 myo-inositol의 시용에서 더 증가되었다.

• 한국식품과학회지
• /
• 제23권1호
• /
• pp.25-30
• /
• 1991

영양학적으로 매우 우수한 부존자원이라 할 수 있는 닭 간의 이용 가능성을 검토하기 위하여 alkaline protease로 가수분해 시켰다. 가수분해시 최적조건을 파악하기 위하여 온도, 시간, pH 및 효소 첨가량(E/S ratio)의 조건을 검토하고 수분과 기름의 흡수성, 유화활성, 점도등의 기능성을 조사하였으며 냄새와 색에 대한 관능검사를 시행하였다. Alkaline protease로 닭 간 단백질을 가수분해 시켰을 때 온도 $60^{\circ}C$, pH8.0에서 최대활성을 나타내었고, 효소의 첨가량이 증가할수록 가수분해도는 증가하였다. 수분과 기름의 흡수성은 수분 흡수성에 있어서 0시간에서만 낮은 값을 보여주었고 반응시간이 지날수록 감소하는 경향을 나타내었다. 또한 점도는 증가하였다. 가수분해 1/2시간에서 유화활성도는 가장 낮았고 수분흡수력은 높았으며 1시간 이후에는 시료간에 큰 차이가 없었다. 동결건조된 닭 간 단백질 가수분해물의 냄새와 색깔에 대한 관능평가에서는 별차이가 없었으나 색깔에서는 밝기와 붉은색에서 유의성이 있었으며 가수 분해는 닭 간의 밝기를 증가시키면서 녹색을 약간 있게함을 알 수 있었다.

• 대한설비공학회:학술대회논문집
• /
• 대한설비공학회 2008년도 하계학술발표대회 논문집
• /
• pp.304-308
• /
• 2008

The optimal design of two stage evaporation & absorption system which is related to the large temperature difference system was investigated numerically in the absorption refrigeration system. The concentrations at inlet & oulet of absorber are 62.9% and 56.9%, but in two stage absorption system the values are 62.2% and 56.2%. Therefore strong solution & weak solution became diluted than the standard value. The amount of weak solution circulation can be reduced in absorption refrigeration system, and the sensible heat load is more reduced to enhance the COP of system. As UAR is increased, COP becomes larger, and this means the role of top section is more important than bottom section in two stage evaporation & absorption system. But the increase of COP becomes slower at 0.7 of UAR ratio. The performance of Type2 is higher than Type1 in COP with the flow direction of cooling waters. This phenomena is due to the active absorption of vapor -absorption & lower temp. cooling water is more effective. The pressure at bottom section becomes higher & that at top section becomes lower and therefore the circulation rate can be diminished more.

• 대한설비공학회:학술대회논문집
• /
• 대한설비공학회 2008년도 동계학술발표대회 논문집
• /
• pp.203-211
• /
• 2008

The optimal design of two stage evaporation & absorption system which is related to the large temperature difference system was investigated numerically in the absorption refrigeration system. The concentrations at inlet & oulet of absorber are 62.9% and 56.9%, but in two stage absorption system the values are 62.2% and 56.2%. Therefore strong solution & weak solution became diluted than the standard value. The amount of weak solution circulation can be reduced in absorption refrigeration system, and the sensible heat load is more reduced to enhance the COP of system. As UAR is increased, COP becomes larger, and this means the role of top section is more important than bottom section in two stage evaporation & absorption system. But the increase of COP becomes slower at 0.7 of UAR ratio. The performance of Type2 is higher than Type1 in COP with the flow direction of cooling waters. This phenomena is due to the active absorption of vapor -absorption & lower temp. cooling water is more effective. The pressure at bottom section becomes higher & that at top section becomes lower and therefore the circulation rate can be diminished more.

• 한국콘크리트학회:학술대회논문집
• /
• 한국콘크리트학회 2002년도 가을 학술발표회 논문집
• /
• pp.233-238
• /
• 2002

In this paper, the characteristics of fresh and hardened recycled concrete were experimentally compared to investigate the applicability of the recycled fine aggregates with the substitution ratio. Test results show that the workability of the recycled concrete decreases with the increment of substitution ratio of the recycled fine aggregates except for type-D case which has a lower absorption ratio. Also air content was increased with increasing substitution ratio. It was found that the compressive strength and elastic modulus of recycled concrete were decreased with increasing substitution ratio of the recycled fine aggregates. And, the superplasticizer was more effective on the workability recovery of the recycled concrete.

• 대한물리치료과학회지
• /
• 제9권4호
• /
• pp.185-192
• /
• 2002

Ultrasound has been found useful as a therapeutic modality for the reduction of muscular and tendinous spasm. It has also been utilized for pain and other pathologic conditions through the ability of soundwaves to introduce molecules of chemical substances through the skin by a process. Choice of the transmission medium is very important for effective ultrasound treatment in clinical field. The purpose of this study was to analyze the effects of various ultrasound conduction media in regard to ultrasound conductivity and degree of absorption, evaporation and of skin irritation. The media used in this study were Antiphlamine, Sacch lotion, Stereogel, Trastgel, Antiphlamine S lotion, and Mentholatum lotion that have been used in clinical medicine. The study revealed that Antiphlamine was not compatible with a good ultrasound transmitter. Other media excluding Antiphlamine were compatible with a good ultrasound conductor, but they had some drawback with their nature of higher absorption, evaporation and skin irritation. The medium that was prepared by mixing of Antiphlamine with Gel in 1 to 10 ratio was a good ultrasound transmitter and extents of absorption and evaporation and of skin irritation of it were less than the other media.

• Composites Research
• /
• 제31권5호
• /
• pp.215-220
• /
• 2018

본 연구에서는 적층 패턴이 다른 5가지 섬유금속적층판(Fiber Metal Laminates, FMLs)에 대한 유한요소해석을 수행하여 선행 연구로 수행한 낙추충격시험과의 유사성을 검증하였고, 효과적인 저속 충격 해석 모델을 개발하였다. 또한 동일한 두께를 가지는 연강(mild steel)과 에너지흡수율을 비교하여 Carbon-Steel 섬유금속적층판의 내충격성을 확인하였다. Carbon-Steel 섬유금속적층판은 동일한 두께를 가지는 연강에 비하여 우수한 충격흡수율을 보였으며, 모든 적층 패턴에서 96% 이상의 높은 에너지흡수율 갖는 것을 확인하였다. 본 연구에서 제시한 저속 충격 해석 모델은 복합형상 및 자동차 구조체 연구에 효과적으로 적용할 수 있을 것으로 판단된다.

• 한국구조물진단유지관리공학회 논문집
• /
• 제22권4호
• /
• pp.76-82
• /
• 2018

PSC 구조에서 덕트 내부의 그라우트는 텐던 부식에 효과적인 부식방어 기재이다. 본 연구에서는 일반적으로 사용되고 있는 그라우트와 낮은 물-시멘트비와 실리카 퓸을 혼입한 그라우트를 대상으로 역학적, 내구적 시험을 수행하였다. 높이 1000mm의 덕트를 이용하여 텐던 시스템을 제작하였으며, 두 가지 그라우트에 대하여 강도, 흡수율, 플로우, 블리딩, 팽창률 등을 평가하였다. 또한 내부 12.7mm 텐던에 대하여 ICM(Impressed Current Method)를 이용하여 2일 및 4일 동안 부식을 촉진시켰으며 부식량을 조사하였다. 개선된 그라우트에서는 10MPa 이상의 높은 강도와 50% 이하의 낮은 흡수율을 나타내었다. 또한 2일~4일 동안의 부식촉진실험에서 39.8%~48.2%의 뛰어난 부식감소율 나타내었다.

• Rapid Communication in Photoscience
• /
• 제1권2호
• /
• pp.31-33
• /
• 2012

The Fluorescent 7-aminodipyrido[3,2-a:2',3'-c]phenazine (7-amino-dppz, 1) is functionalized as an europium ion ($Eu^{3+}$) sensor, which showed the effective emission quenching when europium cation is chelated to the bpy site of 1 compound. The complexation ratio indicated that the 1 compound forms a 1 : 1 complex with $Eu^{3+}$.

• Advances in concrete construction
• /
• 제11권4호
• /
• pp.307-314
• /
• 2021

Activated hwangtoh (ACT) is a natural resource abundant in South Korea, approximately 15.0% of soil. It is an efficient mineral admixture that has activated pozzolanic properties through high-temperature heating and rapid cooling. The purpose of this study is to improve a curb mixture that can reduce NOx outside and investigate durability performance. To this end, mortar curb specimens were manufactured by replacing OPC with ACT. The ACT substitution ratios of 0.0, 10.0, and 25.0% were considered, and mechanical and durability tests on the curb specimens were conducted at 28 and 91 days of age. Steam curing was carried out for three days for the production of curbs, which was very effective to strength development at early ages. The reduction in strength at early ages could be compensated through this process, and no significant performance degradation was evaluated in the tests on chloride attack, carbonation, and freezing and thawing. The mortar curb with an ACT of 10.0~25.0% replacement ratio exhibited clear NOx reduction through photocatalytic (TiO2) treatment. This is due to the increase in physical absorption through surface absorption and the photocatalyst-containing TiO2 coating. In this study, the reasonable range of the ACT replacement ratio for NOx reduction was quantitatively evaluated through a comprehensive analysis of each test.