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윤형식(Youn, Heong-Sik),김용승(Kim, Yongseung) 한국항공우주연구원 2015 항공우주산업기술동향 Vol.13 No.1
By now we hold the ability to develop the submeter high resolution satellite. It is the outcome of continuous development supported by the government demand and upbringing policy. Korea started the sales of satellite images by KOMPSAT-1 in 2000 and made a full-scale attempt to sell the KOMPSAT-2 images in 2007. Despite such efforts, the business outcome has not been improved because of some entry barriers. We are now faced with the times that force us to enter the global market of satellite images for the better business outcome, using the past experience and domestic infrastructure. Unlike our case, the American, French, and Canadian companies develop the emerging market and occupy the 75% of world market. The business strategy of these advanced countries is that: 1) the government fosters the relevant business companies to strengthen the competitiveness and to equip the growth engine. 2) the company establishes the growth platform to develop the foreign market, while providing its government users with satellite images and services. Under the changing environment of global market of satellite images, we examine whether or not our paradigm with the emphasis on the public services is suitable for global marketing of our satellite images. As a first step to meet the demands of the times, we suggest the strategic approaches to enhance the export of satellite images.
김윤호(Youn-ho Kim),윤형식(Hyong-Sig Youn),임재환(Jae-Whoan Lim),이석필(Suk-pil Lee),박상희(Sang-Hui Park) 대한전자공학회 1992 대한전자공학회 학술대회 Vol.1992 No.10
One of the most difficult problems in depth control for underwater vehicle is the effect of seaway disturbance. One component of the seaway forces is of large magnitude with a relatively narrow-band, first order component. The other component is generally of somewhat smaller magnitude, second order component. Since the magnitude of the first order component is generally much greater than the compensating force that can be generating by the planes, it is undesirable for the controller to generate a control command. In this paper, we designed adaptive notch filtering system using filter bank structure. Energies of each band-passed signal are obtained by MA(Moving Average )method and compared to produce center frequency. By adapting this parameter to notch filter, lst order seaway disturbance can be removed, which lead to the improvement of automatic depth control system.