http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
조태준,David Joaquin Delgado-Hernandez,신성우 한국자료분석학회 2010 Journal of the Korean Data Analysis Society Vol.12 No.4
Worldwide, there are over 80,000 high dams(higher than 10 m) in existence, and 50% of them have been more than 50 years in service since construction, and 10% are aged over 80 years. Although some researches in the dam arena have focused on safety issues, most of them only contemplated the hydraulic functions of these structures. Unfortunately, due to the accelerated global warming climate condition, the risk of catastrophic structural failure increases as time goes by, mainly because extraordinary rainfalls can surprise dam owners and operators anytime. Hence, risk assessment and management for old dams are strongly needed, which could provide information for maintenance planning. In general, the failure of a dam leads to significant economic loss and usually to catastrophic impacts. So, this paper aims to comprehensively examine the variables that influence earth dam breaks and describe their interactions. Consequently, a probabilistic model has been developed that enables to assess risks and to prioritize the distribution of resources with the choice of Bayesian belief networks(BBN) as a tool for assessing risks. The model may be of interest for dam owners, practitioners and academics on their efforts to manage small dams risks.
Robust Synchronization of Arrays of Lagrangian Systems
David Rosas,Joaquin Alvarez,Daniel Hernandez,Ervin Alvarez 제어·로봇·시스템학회 2010 International Journal of Control, Automation, and Vol.8 No.5
A new technique to synchronize arrays of uncertain, disturbed Lagrangian systems, where the synchro-nization signals use only the position measurement, is proposed. The technique, robust with respect to some kinds of connection losses and matched disturbances, can be applied to different topologies whose connection matrix is not necessarily symmetric. The design of the coupling signals is based on a discontinuous robust observer that identifies, at the same time, the velocity vector and any matched disturbance containing unknown terms, parameter uncertainty, or unknown external perturbations. This estimated disturbance is incorporated in the coupling signal to compensate the real perturbations, improving significantly the synchronization performance. The technique is illustrated with numerical simulations and some experiments carried on some real systems.