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오남석 ( Nam Seok Oh ),김민영 ( Min Young Kim ),장귀영 ( Gwi Young Jang ),백소윤 ( So Yune Baek ),정미연 ( Mi Yeun Joung ),강태수 ( Tae Su Kang ),이준수 ( Junsoo Lee ),정헌상 ( Heon Sang Jeong ) 한국식품영양학회 2017 韓國食品營養學會誌 Vol.30 No.5
The objective of this study was to investigate the non-thermal sterilization effect of methods such as high hydrostatic pressure (HHP) and UV-irradiation (specifically with regard to the storage stability and shelf-life of carrot juice. The microbial counts of the non-sterilized product increased from 5.51 to 7.34 log CFU/mL up to the fifth day, and then decreased to 5.46 log CFU/mL at six days. UV-irradiation was increased from 2.37 to 4.92 log CFU/mL. HHP was maintained under the 3 log CFU/mL. The pH of UV-irradiation and HHP was maintained withing the range of 6.29~6.30 and 6.20~6.22 during storage. However, the pH arising from non-sterilization decreased from 6.31 to 4.49. The color of non-sterilization changed significantly during storage, but UV-irradiation and HHP were similar during storage. The β- carotene content of non-sterilization was noted to have decreased from 269.45 to 65.19 μg/mL during storage. The UV- irradiation and HHP decreased from 263.46 and 268.35~281.16 μg/mL to 243.42 and 244.09~269.29 μg/mL, respectively. In conclusion, these findings suggest that HHP can be used for the pasteurization, or sterilization, of carrot juice and the optimal condition is two minutes.
백소윤(So Yune Baek),이윤정(Yoon Jeong Lee),장귀영(Gwi Young Jang),김민영(Min Young Kim),오남석(Nam Seok Oh),이미자(Mi Ja Lee),김현영(Hyun Young Kim),이준수(Jun Soo Lee),정헌상(Heon Sang Jeong) 한국식품영양과학회 2017 한국식품영양과학회지 Vol.46 No.10
보리 도정 시 발생되는 부산물(맥강)의 이용방안을 모색하기 위하여 5가지 품종의 쌀보리 보석찰(유색 찰성), 흰찰쌀(찰성), 다한(메성), 흑광(유색), 흑누리(유색)를 23%로 도정한 다음 입도별(<60 mesh(fraction Ⅰ), 60~100 mesh(fraction Ⅱ), >100 mesh(fraction Ⅲ)로 분획 후, 기능성분 함량에 대해 분석하였다. 베타글루칸의 함량은 모든 품종에서 fraction Ⅱ에서 가장 높게 나타났으며, 다한과 흑누리에서 높은 함량을 나타내었다. 아라비노자일란은 fraction Ⅲ에서 가장 낮은 함량을 보여 입도가 큰 분획물을 이용하는 것이 아라비노자일란 고함유 분획물을 얻을 수 있었다. 총 폴리페놀 및 플라보노이드는 모든 품종에서 fraction Ⅱ에서 가장 높은 함량을 나타내었으며, 항산화력과 라디칼 소거능 역시 fraction Ⅱ에서 가장 좋은 활성을 나타내어 비슷한 경향을 나타내었다. 분석한 모든 기능성분의 함량이 높았던 fraction Ⅱ는 보리의 겨층 부분과 배유층 부분이 적절히 혼입된 분획물로 판단되기 때문에 맥강의 기능성 식품 소재화를 위한 맥강을 선정할 때 fraction Ⅱ를 활용하는 것이 좋을 것으로 판단되었다. 이러한 결과는 보리 도정 부산물의 효율적인 이용을 위하여 품종 및 입도별 분류를 통해 유용성분이 고함유되어 있는 층을 얻고, 이를 활용한 식품 기능소재로서의 가능성을 확인하였다. This study evaluated the functional components of barley bran with different particle sizes and cultivars (Dahan, Hinchalssalbori, Heukgwang, Huknuri, and Boseokchal). Barley bran divided into fractions Ⅰ (<60 mesh), Ⅱ (60∼100 mesh), and Ⅲ (>100 mesh) was collected as pearling by-products produced by an industrial process consisting of consecutive barley pearlers. Total β-glucan contents of all cultivars were especially highest in fraction Ⅱ. Total arabinoxylan was the highest in barley bran from Boseokchal in fraction Ⅱ. Total polyphenol contents were the highest in bran from Boseokchal and Hinchalssal in fraction Ⅱ, and contents ranged of 5.61∼7.00 and 4.24∼6.58, respectively. Total flavonoid contents of all cultivars were especially highest in fraction Ⅱ. 2,2’-Azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) and 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging activities ranged from 2.78∼7.53 mg L-ascorbic acid (AA) eq/g and 2.24∼4.83 mg AA eq/g, respectively. ABTS and DPPH radical scavenging activities were the highest in barley bran from Dahan in fraction Ⅱ. In this study, fraction Ⅱ showed enriched functional components and has the best particle size range for enriched antioxidant activities. These results provide useful data for selection of appropriate cultivars and particle size of bran to achieve high quality barley processing.
Empirical relation between the Hall voltage and domain wall position in a Hall bar geometry
Lee Seong-Hyub,Nam Yune-Seok,Kim Myeonghoe,Kim Minhwan,Choe Sug-Bong 한국물리학회 2022 Current Applied Physics Vol.41 No.-
The anomalous Hall effect has been used as a versatile tool for the measurement of various transport phenomena in magnetic systems, particularly those with perpendicular magnetic anisotropy. The anomalous Hall voltage responds not only to the magnetization state but also to the position of magnetic domain walls when the magnetic domain passes through the Hall bar structure. In this study, an empirical relation was developed between the Hall voltage and domain wall position in the Hall bar geometry. This relation was first developed by numerical simulations and then, confirmed by analytical formulae. The validity of the empirical relation was finally verified by experimental results. The present empirical relation provides an experimental method for the electric detection of the position of magnetic domain walls.
Electrical detection of magnetic domain wall in Hall bar structure
Seong-Hyub Lee,Myeonghoe Kim,Yune-Seok Nam,Sug-Bong Choe 한국자기학회 2021 한국자기학회 학술연구발표회 논문개요집 Vol.31 No.2
Here we report electrical detection of magnetic domain wall in Hall bar structure in various wire dimensions within perpendicular magnetic anisotropy system. To examine as many as possible device structures in one coupon sample, wire width and Hall bar width combination was arranged as 8 by 5 matrix. Using Dc magnetron sputtering, our conventional perpendicular magnetic anisotrpy thin film Ta [5 nm] / Pt [2.5 nm] / Co [0.3 nm] / Pt [1.5 nm] trilayer structure was deposited on the commercial Si [525μm] / SiO₂ [100 nm] diced to 12 mm by 12 mm wafer substrate. Then Hall bar pattern was transferred to this film by using photolithograpy and ion milling process. And finally electrode pattern was also tranferred followed by Ta [5 nm] / Au [80 nm] electrode deposition and lift off process. Now in this microstructure, magnetic domain wall position was optically detected by laser p-MOKE with anomalous Hall signal simultaneously. Wire width dimension (WM) is assigned as [40, 30, 25, 20, 15, 10, 5, 2 μm] and Hall bar width (WH) is assigned as [10, 8, 6, 4, 2 μm]. Hall signal of magnetic domain wall was fitted as a*tanh{b(x-c)} and if the value of a reach 90 % of total anomalous Hall signal, detection range of magnetic domain (R) is defined as [2tanh<SUP>-1</SUP>(0.9)/b] . Fig. 1 is our example data of Hall signal versus position of magnetic domain wall (DW). Interestingly, maximum value of ratio between detection range and Hall bar width was 23.4 which is very seneitive to the position of magnetic domain wall. In conclusion by measuring the detection range of magnetic domain wall via anomalous Hall signal in diverse wire dimensions, we investigate the sensitivity of anomalous Hall signal to magnetic domain wall position. 〈그림 본문참조〉
Magnetic Domain-wall Tilting Mechanism during the Transition of Domain-wall Chiralilty
Jung-Hyun Park,Dae-Yun Kim,Yune-Seok Nam,Hyun-Seok Whang,Sug-Bong Choe 한국자기학회 2021 한국자기학회 학술연구발표회 논문개요집 Vol.31 No.2
Spin structure inside domain wall (DW) has attracted great attention due to its potential application on data storage or logic memory. Among terms affecting chirality of DW, Dzyaloshinskii-Moriya interaction (DMI) has been investigated in magnetic thin layer with perpendicular magnetization anisotropy. Based on such platform, most of experimental schemes have measured the chirality change under application of external in-plane field. By changing in-plane field, the direction of magnetization inside DW is changed, resulting in modification of chirality, DW energy, DW dynamics, etc. But those schemes have an assumption that DW is straightly placed across wire and only one variable, direction of the magnetization inside DW, is changed. Here, we propose generalized equation of equilibrium chirality with not only the degree of freedom of DW chirality (Ψ), but also the DW tilting angle (θ). With coordinate system in fig. 1, we numerically calculated equilibrium angle of Ψ and θ, giving a result of DW tilting in the transition regime of DW chirality (fig. 2). This result is counterintuitive in a sense that DW would not be tilted in transition regime as its energy is maximum at Ψ=0. Tilting angle of DW is maximum when in-plane field is applied as much as effective DMI field. Interestingly, the transition regime is widened as both Ψ and θ contribute to reduction of DW energy when in-plane field is changed. Additionally, we analytically calculated the critical field at which the DW starts and ends tilting. This study provides more realistic understanding of chirality and tilting mechanism by considering both contribution to DW energy. 〈그림 본문참조〉