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The extension of classical rough set model is a very hot and interesting topic. In this paper, our aim is to present the first type of graded rough set (FGRS) based on rough membership function. The concepts of k-regions, k-rough degree, etc., are proposed firstly, and some of important properties are investigated in this rough set model. Moreover, the model has the corresponding properties with classical...
In this article, a new method for lower approximation reduction is introduced in inconsistent ordered information systems (IOIS). The dominance matrix and lower approximation decision matrix are proposed in information systems based on dominance relations. Furthermore, the algorithm of lower approximation reduction is obtained, from which we can provide approach to lower approximation reduction operated...
In this paper, a novel key group agreement scheme based on two-tier architecture in wireless Ad hoc network is proposed. A centralized group key agreement is applied in the lower layer of network, and a distributed group key agreement is applied in the upper layer of network. Therefore, it gains the advantages of two key agreement modes to increase network flexibility and group key updating efficiency...
With the requirements of scheduling time triggered and event-triggered tasks, simply adopting cooperative scheduling or preemptive scheduling is more difficult to satisfy the practical demand in embedded real-time operating system. In order to integrate different scheduling modes and triggering modes, to obtain their advantages for improving scheduling performance, a real-time kernel SinewOS based...
Traditional embedded systems employ a time-triggered scheduler or an event-triggered scheduler, however, the truth is that time-triggered scheduling architecture is more dependable but lack of responsiveness to external events and event-triggered scheduling architecture is responsive. In order to get those advantages at the same time, a real-time kernel with a hybrid scheduler, named SinewOS, is developed...
The finite precision nature of digital hardware makes it necessary to consider the effects of finite wordlength (FWL) when performing a controller design. Most studies on these issues only consider the optimal FWL implementation for a given controller without regard to the controller synthesis. It is known that such "optimal realization" is not optimal overall. In this paper, the direct...
A new approach is proposed to design optimal finite word length (FWL) realizations of digital controllers implemented in fixed-point arithmetic. An analytical method is first formulated to obtain a global optimal controller realization that optimizes an FWL closed-loop stability measure. A dynamic range measure is next derived for the implemented controller realization, and a numerical optimization...
A method is derived to approximate the L1-norm of continuous-time linear time-invariant systems. The optimization problem is then formulated to design fixed-order L1-controller. The method of approach and simulated annealing algorithm are utilized to solve the problem. Numerical examples illustrate the design procedure
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