Xun Yu

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We study stochastic linear{quadratic (LQ) optimal control problems over an innnite horizon , allowing the cost matrices to be indeenite. We develop a systematic approach based on semideenite programming (SDP). A central issue is the stability of the feedback control; and we show this can be eeectively examined through the complementary duality of the SDP.(More)
A fault-tolerant real-time scheduling algorithm through time redundancy, with a schedulability bound, is based on the worst execution time of tasks and the time reserved for fault-tolerant operation of tasks, has a high rejection rate and low resource utilization. This paper presents fault-tolerant earliest deadline scheduling with resource reclaim, based(More)
We study a deterministic linear-quadratic (LQ) control problem over an innnite horizon, and develop a general approach to the problem based on semi-deenite programming (SDP) and related duality analysis. This approach allows the control cost matrix R to be non-negative (semi-deenite), a case that is beyond the scope of the classical approach based on(More)
Markov-modulated Poisson process (MMPP) is a generalization of Poisson process and is commonly used in modeling the input process of communication systems such as data traac systems and ATM networks. In this paper, we give fast algorithms for solving queueing systems and manufacturing systems with MMPP inputs. We consider queueing systems where the input of(More)
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