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n-3고도 불포화 지방산의 산화억제에 미치는 플라보노이드와 a-토코페롤의 효과 -1. 정제어유의 가열 및 저장 중 산화억제 효과-
정동윤,권미나,홍정화,변대석,JUNG Dong-Yun,KWON Mi-Na,HONG Jeong-Hwa,BYUN Dae-Seok 한국수산과학회 1994 한국수산과학회지 Vol.27 No.2
To evaluate the antioxidant effect of flavonoids and a-tocopherol on purified fish oil(up to $40\%$ of n-3 polyunsaturated fatty acids), lipid peroxidation, and fatty acids content during storage and upon heating were determined. The potential of these compounds for inhibiting and delaying both oxidation and lipoxygenase processes was also evaluated. The oxidation of fish oil was effectively inhibited by flavonoids and a-tocopherol. The antioxidizing effect of these compounds increased in proportion to their concentration. The addition of a-tocopherol and catechin-a-tocopherol mixture were prolonged induction period of lipid oxidation by 3.5 to 4 times. All other flavonoids also shown more than twice the prolonging effect. Lipoxygenase activity was decreased by catechin and a-tocopherol effectively.
LTCC 다층 회로를 이용한 밀리미터파 대역 저 손실 유전체 도파관 필터
정동윤(Dong Yun Jung),은기찬(Ki Chan Eun),박철순(Chul Soon Park) 대한전자공학회 2006 대한전자공학회 학술대회 Vol.2006 No.11
For millimeter-wave band applications, this paper presents a fully embedded multi-layer dielectric waveguide filter (DWGF) with very low insertion loss and small size, which does not need any additional assemblies such as flip-chip bonding and bond wiring for radio integration. The filter is formed incorporating metallized through holes in low temperature co-fired ceramic (LTCC) substrates with a relative dielectric constant of 7.05. We have studied the DWGF with a low-loss conductor backed co-planar waveguide-to-embedded-microstrip line-to-waveguide (CBCPW-to-eMSL-to-WG) transition structure for millimetwer-wave band system-on-package (SoP). The input/output pads have a CBCPW structure suitable for interconnection of MMICs. The filter consists of two resonators using metallized inductive posts in the LTCC dielectric substrate. The total volume of the filter including all transitions and measurement pads is 6.37 × 3.33 × 0.2 ㎣. A fabricated DWGF with eMSL-to-WG transitions shows a center frequency of 60.8 ㎓ and exhibits an insertion loss and return loss of 2.9 ㏈ and less than 20 ㏈, respectively. The measured results of a test pattern including two transitions of the input/output ports and 2660 ㎛ long waveguide show insertion loss as small as 0.8 ㏈ at a center frequency of 60.8 ㎓, and a return loss better than 11.6 ㏈ for the overall V-band.