BACKGROUND The influence of parity and time interval between age at first pregnancy (AFP) and age at diagnosis on breast cancer survival is not established in the same way as their influence on breast cancer risk. We aimed to investigate the association of time interval or parity with prognosis in pre- and postmenopausal women in Korea. METHODS We conducted a retrospective study of 29,167 wom...

This paper considers linear time-invariant decentralized singular systems which are either nonregular or, if they are regular, they have impulsive modes. It derives algebraic necessary and sufficient conditions for making a singular system both regular and impulsefree by decentralized output feedback control laws and decentralized proportional-plus-derivative output feedback control laws.

This is a proposal for a model and an architecture for decentralized process centered environments, supporting collaboration and concerted eeorts among geographically-dispersed teams { each team with its own autonomous process { with emphasis on exible control over the degree of collaboration and autonomy provided. The focus is on decentralized process modeling and on decentralized process enac...

This paper provides a new approach to decentralized failure-tolerant control using passivitybased stability conditions. A controller design method is developed to achieve both decentralized unconditional stability (a transformed passivity condition) and user-specified H2 performance. The control synthesis problem is solved by using successive semidefinite programming. The proposed method is ill...