No abstract

This paper presents a comparison of antenna factor characteristics computed by the Method of Moments(MoM) and the electromotive force(EMF) method for a calculable dipole antenna with a hybrid balun. An expression for the antenna factor is formulated using the concept of power mismatch loss. The input impedance and effective length of the antenna, which are in the formula of the antenna factor, are calculated using the two methods. The results show that the antenna factors are agreed within 0.24 dB, although the maximum difference between the input impedances obtained from the two methods is about 17 Ω.

No abstract

No abstract

Aconitum pesudo-laeve var erectum has been known to possess anti-inflammatory activity and modulate the intestinal immune system. In addition, it has traditionally been used for the treatment of water retention in the body. In this study, the anti-aging and anti-diabetes effects of water and ethanol extracts from Aconitum pesudo-laeve var. erectum were investigated. The activities of each extract were measured by antioxidant tests such as DPPH and ABTS radical scavenging activity, antioxidant protection factor (PF), TBARs content, and α-amylase and α-glucosidase inhibition activity assay. DPPH radical scavenging activity was found in over 50% of water and ethanol extracts at 100 μg/ml, 50 μg/ml, respectively. The ABTS radical scavenging activity of ethanol extract was 99.8±0.1% at 1,000 μg/ml in water, which was highest among the ethanol extract concentrations. PFs measured with β -carotene-linoleate model systems were in the order of ethanol (1.49 PF at 1,000 μg/ml) > ethanol (1.40 PF at 500 μg/ml) > water (1.33 PF at 1,000 μg/ml) > water (1.27 PF at 500 μg/ml). TBARs content in ethanol extracts (1,000 μg/ml) was 0.16±0.03 μM, which was lower than that of water extracts and other ethanol extract concentrations. The extracts also showed over 90% of α-amylase inhibition and over 60% of α-glucosidase inhibition ratio in water (1,000 μg/ml) and ethanol extracts (100∼ 1,000 μg/ml). These results suggest that Aconitum pesudo-laeve var. erectum extracts could be used as a cosmetic source and preventive agent for aging and diabetes.