The KOMPSAT-5 is the first synthetic aperture radar satellite in South Korea, equipped with a single frequency GPS receiver and a dual frequency GPS receiver. The KOMPSAT-5 will be launched in the middle of 2012 by DNEPR launcher, and its mission orbit is 550km sun-synchronous dawn-dusk orbit with a 28 day ground repeat cycle. The main mission of KOMPSAT-5 supports geographic information system, ocean and land management, and disaster and environmental monitoring. The SAR payload has three operation modes including high-resolution, standard, and wide-swath, and its image resolutions in dedicated swaths are 1 m, 3 m, and 20 m, respectively. This paper was initially intended to describe the whole operational results from KOMPSAT-5 LEOP. However, the preparations for LEOP activities are mainly dealt with due to the unexpected launch delay. In this paper, pre-launch activities are summarized including the system functional review and the operational validation test for flight dynamics system of KOMPSAT-5. And, the sequence of events with nominal operational timeline for flight dynamics activities is defined for initial orbit acquisition and initial orbit determination. In addition, the results of operational validation test, which is intended to check and validate the readiness of flight dynamics system and operational procedure, are summarized.
In this paper, a collision avoidance maneuver frequency for the KOMPSAT-2 and the KOMPSAT-5 is analyzed. For the statistical prediction of the avoidance maneuver frequency, mission orbits, responsive time, accepted collision probabilities, and positional uncertainties of primary and secondary objects are considered. In addition, the collision avoidance maneuver frequency of the KOMPSAT-2 is compared to the case that NORAD catalog during one year is used to calculate that of the KOMPSAT-2. As a result, the collision avoidance maneuver frequency is one per year on average and effective factors on the statistical prediction of the avoidance maneuver frequency are investigated. Efforts to improve its prediction accuracy are also discussed.
The optimum mixing ratio of red ginseng, herbal medicine extracts, and oligosaccharides for diabetic improvement was investigated and verified through animal experiments. Using the optimum mixing technique, 2% red ginseng extract, 15% oligosaccharides, and 83% herbal medicine extracts were determined to be optimal for red ginseng beverages. The taste was improved as the amount of red ginseng decreased and oligosaccharides increased, whereas antioxidative activity was increased with increased red ginseng. In the animal model in which streptozotocin was administered to BALB-c mice, the red ginseng administration group exhibited lower blood glucose than the diabetic control group, and the blood glucose level was lower in the herbal medicine and red ginseng extract administration group. Insulin concentration was slightly increased by the red ginseng beverage, and hepatotoxicity due to excessive intake of red ginseng beverages was not detected.
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