A delayed feedback control framework for stabilizing unstable periodic orbits of linear periodic time-varying systems is proposed. In this framework, act-and-wait approach is utilized for switching a delayed feedback controller on and off alternately at every integer multiples of the period of the system. By analyzing the monodromymatrix of the closed-loop system, we obtain conditions under whi...

The problem of modeling claims occurring in periodic random environments is discussed in this paper. In the classical approach of risk theory, the occurrence of claims is modeled by counting processes that do not account for claims following a periodic pattern. The author discusses how the use of the classical approach to model a periodic portfolio might lead to the miscalculation of important ...

Partial periodic patterns are commonly seen in real-world applications. The major problem of mining partial periodic patterns is the efficiency problem due to a huge set of partial periodic candidates. Although some efficient algorithms have been developed to tackle the problem, the performance of the algorithms significantly drops when the mining parameters are set low. In the past, the author...

This paper proposes a new approach to the well known LiuLayland periodic scheduling problem. This approach proves that any justin-time sequence with maximum absolute deviation being less than one is in fact a periodic schedule. Consequently, periodic schedules can be obtained by any algorithm capable of generating just-in-time sequences with maximum absolute deviation being less than one, for i...

In this paper, the existence of periodic solutions of a delayed competitive system with the effect of toxic substances is investigated by using the Gaines and Mawhins continuation theorem of coincidence degree theory on time scales. New sufficient conditions are obtained for the existence of periodic solutions. The approach is unified to provide the existence of the desired solutions for the co...

Usually spectral structure of the ordinary periodic Schrödinger operator is revealed based on analysis of the corresponding transfer-matrix. In this approach the quasi-momentum exponentials appear as eigenvalues of the transfer-matrix which correspond to quasi-periodic solutions of the homogeneous Schrödinger equation, and the corresponding Weyl functions are obtained as coordinates of the appr...

In this paper, we propose a hybrid approach to refine the phonetic boundaries in a Mandarin speech corpus. This approach employs different sets of acoustic features for different categories of phonetic transitions, except for the most difficult case of “periodic voiced + periodic voiced”, which is therefore handled by a heuristic scheme. Several experiments are designed to demonstrate the feasi...

We propose an integrated numerically reliable computational approach to solve fault detection and isolation (FDI) problems for periodic systems. For this purpose, a bank of periodic fault detection filters providing a structured residual set is designed using a new least order synthesis technique of periodic fault detection filters. The synthesis procedure relies on a recently developed numeric...

In this paper, we study the problem of scheduling periodic tasks on multiple periodic resources. We take two step approach by first integrating multiple periodic resources to an equivalent single periodic resource so that existing real-time scheduling theorems on single periodic resource can be applied. Second, we extend the schedulability tests of periodic tasks on a single periodic resource i...

agriculture as one of the major economic sectors of iran, has an important role in gross domestic production by providing about 14% of gdp. this study attempts to forecast the value of the agriculture gdp using periodic autoregressive model (par), as the new seasonal time series techniques. to address this aim, the quarterly data were collected from march 1988 to july 1989. the collected data w...