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Sliding Mode Robust Control of Supersonic Three Degrees-of-Freedom Airfoils
나성수,이복희,조정환,Pier Marzocca 제어·로봇·시스템학회 2010 International Journal of Control, Automation, and Vol.8 No.2
The robust aeroelastic control of a three-degrees-of-freedom (3DOF) linear and non-linear wing-flap system under sliding mode control (SMC) and operation in supersonic flight speeds is presented. Open- and closed-loop aeroelastic responses to blast and sonic-boom excitation in the wing-flap system with uncertainty, as well as flutter analysis, are investigated along with the implementation of a Sliding Mode Observer (SMO). The effectiveness of control in reducing the amplitude of oscillation and preventing flutter instability is demonstrated.
나성수 한국해양비즈니스학회 2016 해양비즈니스 Vol.- No.35
The Korean peninsular is surrounded by the sea and, strategically, very well located for global access and offers connection with other nations. To utilize and also maximize this geographical advantage, Korea should be highly specialized in the maritime industry. This study will employ an input-output analysis to illustrate the value of the maritime industry within the national economy and to emphasize its importance, especially looking into the effect of production inducement and the forward and backward linkage effects. Interestingly enough the production inducement coefficient of the maritime is the third highest after the manufacturing and miscellaneous industries. The maritime industry produces a higher total domestic output than the agriculture and forest industries together. Each sub-sector of the maritime industry shows the high coefficient on real estate & business service; finance & insurance; and the oil, coal, and petrochemical industries. Both port facility and services show very high level of value added inducement coefficient, which proves that port facility and services have outstanding economic effects in terms of value added in contrast to the shipping sector in the maritime industry.