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3D metal printing에 의한 이종금속 대형 조형물 제작 연구
박송이(Song-Yi Park),이채영(Chae-Young Lee),장단비(Dan-Bi Jang),김안나(An-Na Kim),김수현,문유빈(Yu-Bin Mun),정유진(Yu-Jin Joung),조상명(Sang-Myung Cho) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
3D metal printing(AM) technology is the production technology to create metal products in way that the melted metal deposit from 3D CAD model data directly. Recently, research of AM techniques is active. AM techniques are divided into powder-based AM and wire-based AM. Wire-based AM is good for AM products of large-scale with a high speed deposition, inexpensive material. When TIG welding which is one of wire-based AM is applied, TIG welding AM is possible to control respectively the speed of the filler wire and arc intensity. Also, TIG welding AM has the advantages of wire-based AM and of clean environment. This study was carried out to establish the bead shape and dominant parameter that are suitable for build-up. STS316L and Albronze(CuAl-A2) were built up using conventional TIG and the Super_TIG welding in order to apply to the AM. The heat input as build-up should be increased for getting a uniform bead shape, because Albronze has high thermal conductivity. The heat input for STS316L as build-up should be reduced in order to get a uniform bead shape, because it has thermal barrier effect due to low thermal conductivity. Applying the Super_TIG welding, the productivity was about 3times of conventional TIG welding. The uniform wall thickness and good appearance could be obtained even if STS316L and Albronze were built alternately.
상백피 및 강황 추출 혼합물 첨가에 따른 생면의 저장성 및 품질증진 효과
박나비(Na-Bi Park),이소영(So-Young Lee),윤소영(So-Young Yoon),김꽃봉우리(Koth-Bong-Woo-Ri Kim),송유진(Eu-Jin Song),이소정(So-Jeong Lee),이청조(Chung-Jo Lee),정지연(Ji-Yeon Jung),곽지희(Ji-Hee Kwak),이호동(Ho-Dong Lee),최호덕(Ho-Duk Cho 한국식품영양과학회 2010 한국식품영양과학회지 Vol.39 No.5
This study was performed to examine the shelf life and qualities of wet noodle with Morus alba L. root and Curcuma aromatica extracts (MCE) during storage at 4oC. Lightness and redness of wet noodle were decreased with increasing amounts of MCE added in noodle while yellowness was increased. The viable cell and molds count of wet noodle with MCE was reduced about 1~2 ? cycle as compared with control during storage time. Also the TBARS (thiobarbituric acid reactive substance) value of wet noodle with MCE was lower than that of control. Hence the wet noodle with MCE has shown remarkable antioxidation effect. In sensory evaluation, the wet noodle containing the ratio of 2.5:0.02 of M. alba : C. aromatica was preferred than the control. From these results, the addition of 2.5% of M. alba and 0.02% of C. aromatica extracts in wet noodle had a good effect on improvement of preservation and development of quality.
The Fate of 15N-labeled Organic Materials Applied to Chinese Cabbages Cropping System
Cho-Rong Lee,Yura Oh,Bi-Na Song,Jung A Jung,Jeong-Lai Cho,Sang-Min Lee,Nan-Hee An 한국토양비료학회 2020 한국토양비료학회지 Vol.53 No.1
Nitrogen added to farmland is used to plants or remains in soil, or is lost to environment. We incorporated15N-labeled materials (Chemical fertilizer (CF), green manure (GM), livestock compost (LC), GM+LC, andoil cake (OC) to soil and cultivated Chinese cabbages (Brassica rapa subsp. pekinensis) and analyzed the 15Nrecovery of crop and soil to investigate the fate of nitrogen. The results follow. The 15Ncrop recovery ofchemical fertilizer (CF) was the highest, and that of organic materials differed by type. The 15Nsoil recovery ofCF was the lowest, and that of organic materials was 3 - 6 times higher than CF. The 15Nloss was not significantlydifference between CF and organic materials (except GM+LC). As results, despite of the same amount ofnitrogen input, there was the difference in plant uptake and soil residue between organic materials and CF. Nitrogen of CF is used to Chinese cabbages more than organic materials, however most of the remainingnitrogen is estimated to be lost to the environment. Therefore, CF might be hard to occur residual effect in thenext cropping season. In organic materials, nitrogen is less used to Chinese cabbages than CF, but remains insoil more than CF. Therefore, organic materials might be useful for improving soil fertility and have a residualeffect in the next cropping season. We suggest that these properties of organic materials should be taken intoaccount in calculating the amount of applied fertilizer in organic farming where mainly organic materials areused. Moreover, it is necessary to investigate the cumulative and residual effects of continuous input of thesame organic materials.
지충이 추출물의 항산화, 항균 활성 및 물리적 특성에 미치는 감마선 조사의 영향
이소정(So-Jeong Lee),송유진(Eu-Jin Song),이소영(So-Young Lee),김꽃봉우리(Koth-Bong-Woo-Ri Kim),윤소영(So-Young Yoon),이청조(Chung-Jo Lee),정지연(Ji-Yeon Jung),박나비(Na-Bi Park),곽지희(Ji-Hee Kwak),박진규(Jin-Gyu Park),김재훈(Jae-Hun K 한국식품과학회 2010 한국식품과학회지 Vol.42 No.4
지충이(Sargssum thunbergii) 분말 및 에탄올과 물 추출물에 감마선 조사를 실시한 후, 추출물의 항산화, 항균활성 및 물리적 특성 변화를 알아보았다. 그 결과, 지충이 분말에 감마선 조사를 하였을 때, 조사선량에 따라 물 추출물의 수율과 페놀함량이 증가 하였으며, DPPH 라디칼 소거능은 차이를 나타내지 않았다. 감마선 조사한 지충이 추출물의 열과 pH 처리에 따른 페놀함량과 DPPH 라디칼 소거능 변화를 측정한 결과, 열 및 pH 처리에 안정한 항산화 활성을 보였다. 감마선 조사에 따른 항균활성 측정결과, 5종의 그람 양성균에 대해 조사선량에 따른 활성의 차이를 보이지 않았다. 한편, 감마선 조사에 따른 색도 및 점도 변화를 알아본 결과, 색도와 점도는 감마선 조사선량의 증가에 따라 유의적으로 감소하였다. 이상의 결과를 통해 감마선 조사는 지충이 추출물의 항산화 및 항균활성 등의 생리활성은 유지시키면서 수율의 증진과 색도 및 점도의 개선을 통해 추출물의 가공적성을 향상시켜 기능성 식품소재로서 적용 가능성을 보여주었다. This study was carried out to determine the effect of gamma irradiation (3-20 kGy) on the antioxidant, antimicrobial activities and physical characteristics of Sargassum thunbergii (ST) extracts. When ST powder was treated by gamma irradiation, the yields and total phenolic compounds (TPC) of water extracts were increased, but radical scavenging activities were not changed. When ST extract was irradiated, the TPC and DPPH radical scavenging activities were increased. In addition, gamma irradiation of ST extract decreased viscosity and removed color. These results suggest that gamma irradiation would be a useful method for improving the physical characteristics of ST extract while maintaining native biological activities.
The Fate of <SUP>15</SUP>N-labeled Organic Materials Applied to Chinese Cabbages Cropping System
Cho-Rong Lee,Yura Oh,Bi-Na Song,Jung A Jung,Jeong-Lai Cho,Sang-Min Lee,Nan-Hee An 한국토양비료학회 2020 한국토양비료학회지 Vol.53 No.1
Nitrogen added to farmland is used to plants or remains in soil, or is lost to environment. We incorporated <SUP>15</SUP>N-labeled materials (Chemical fertilizer (CF), green manure (GM), livestock compost (LC), GM+LC, and oil cake (OC) to soil and cultivated Chinese cabbages (Brassica rapa subsp. pekinensis) and analyzed the <SUP>15</SUP>N recovery of crop and soil to investigate the fate of nitrogen. The results follow. The <SUP>15</SUP>Ncrop recovery of chemical fertilizer (CF) was the highest, and that of organic materials differed by type. The <SUP>15</SUP>Nsoil recovery of CF was the lowest, and that of organic materials was 3 - 6 times higher than CF. The <SUP>15</SUP>Nloss was not significantly difference between CF and organic materials (except GM+LC). As results, despite of the same amount of nitrogen input, there was the difference in plant uptake and soil residue between organic materials and CF. Nitrogen of CF is used to Chinese cabbages more than organic materials, however most of the remaining nitrogen is estimated to be lost to the environment. Therefore, CF might be hard to occur residual effect in the next cropping season. In organic materials, nitrogen is less used to Chinese cabbages than CF, but remains in soil more than CF. Therefore, organic materials might be useful for improving soil fertility and have a residual effect in the next cropping season. We suggest that these properties of organic materials should be taken into account in calculating the amount of applied fertilizer in organic farming where mainly organic materials are used. Moreover, it is necessary to investigate the cumulative and residual effects of continuous input of the same organic materials.