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Antioxidant activity of 3,5-dicaffeoyl-epi-quinic acid (DEQA) from the halophyte Atriplex gmelinii
김호준,강창숙,서영완 한국응용과학기술학회 2024 한국응용과학기술학회지 Vol.41 No.2
In this study, the antioxidizing effect of 2,3-dicaffeoyl-epi-quinic acid (DEQA) was investigated. The antioxidant activity was evaluated by measuring the scavenging effect on DPPH radical and peroxynitrite and the reducing power on ferric ion. DEQA showed a scavenging effect and reducing power comparable to vitamin C used as a positive control. Also, DEQA effectively inhibited production of intracellular reactive oxygen species (ROS) in HT-1080 cells, showing the scavenging ratio of 43.8% even at 10 μM concentration of DEQA after 2 hours in HT-1080 treated with H2O2. In addition to this, DEQA inhibited the production of nitric oxide (NO) very effectively in Raw 264.7 cells. The above results suggest that DEQA has the potential to be developed as a natural antioxidant.
김호준 한국뇌학회 2003 한국뇌학회지 Vol.3 No.1
본 연구에서는 보다 개선된 영상분할을 얻기 위한 방법으로서, 에지정보와 영역정보가 상호 결합하는 모듈구조의 신경망 기법을 개발하였다. 제안된 모델에서는 가보(Gabor) 필터와 자기구조화특징지도(SOFM) 모델이 초기화 단계를 위해 사용되며, 셀룰러 신경망 및 CSNN이 반복단계의 영상분할과정을 위해 서로 결합하여 동작한다. We have been developed a tracking model to improve the recognition performance, We designed a top-down based face detection model that receives the input data from the bottom-up visual attention network, In order to detect a face effectively, the symmetry feature is applied to visual attention model, Also, we designed a visual tracking system that combines the visual attention and the eye movement.