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On left C - 𝒰 -liberal semigroups

Yong HeFang ShaoShi-qun LiWei Gao — 2006

Czechoslovak Mathematical Journal

In this paper the equivalence 𝒬 ˜ U on a semigroup S in terms of a set U of idempotents in S is defined. A semigroup S is called a 𝒰 -liberal semigroup with U as the set of projections and denoted by S ( U ) if every 𝒬 ˜ U -class in it contains an element in U . A class of 𝒰 -liberal semigroups is characterized and some special cases are considered.

Switching LPV control design with MDADT and its application to a morphing aircraft

Yong HeChunjuan LiWeiguo ZhangJingping ShiYongxi Lü — 2016

Kybernetika

In flight control of a morphing aircraft, the design objective and the dynamics may be different in its various configurations. To accommodate different performance goals in different sweep wing configurations, a novel switching strategy, mode dependent average dwell time (MDADT), is adopted to investigate the flight control of a morphing aircraft in its morphing phase. The switching signal used in this note is more general than the average dwell time (ADT), in which each mode has its own ADT. Under...

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