this paper investigates a discrete-time impatient customer queue with bernoulli-schedule vacation interruption. the  vacation times and the service times during regular busy period and during working vacation period are assumed to follow geometric distribution. we obtain the steady-state probabilities at arbitrary and outside observer's observation epochs using recursive technique. cost an...

We investigate Polish doughnuts with a uniform constant specific angular momentum distribution in the space-times of rotating boson stars. In such thick tori can exhibit unique features not present Kerr space-times. For instance, context retrograde tori, they may possess two centers connected or by cusp. Rotating stars also feature static ring, neither This ring consists orbits, where particles...

background: los angeles classification is widely adopted as a means of unifying endoscopic observation for gerd. we assessed the inter- and intra-observer variability of la classification. materials and methods: two-hundred fifty-four still images of the lower esophagus taken by an expert endoscopist (rm) were randomly selected and presented to 9 gastroenterologists (2 females, 6 experts, 3 tra...

In this paper, a slimple linear high-gain integral-derivative observer is presented based on singular perturbation technique. The proposed integral-derivative observer can estimate synchronously the multiple integrals and derivatives of a signal. The merits of the presented integralderivative observer include its synchronous estimation of integrals and derivatives, simple implementation, suffic...

The paper proposes a method for observer design for a class of nonlinear systems. We decompose the system using a weaker concept than the relative degree. We provide sufficient conditions for global asymptotic stability of the error dynamics. The observer design is carried out by means of a change of coordinates combined with a high gain technique. In particular, our approach results in an obse...

In this paper, the issues of projective synchronization of unidirectional coupled multiple delay systems via linear observer is investigated. A detail stability analysis of multiple delay Rössler system is derived by D-subdivision method. In the previous study, whereas projective synchronization is investigated by nonlinear observer approach, here we can achieve projective synchronization via l...

Consider a redundant ring network where each node is also connected to the nodes at distance d. In the presence of faulty nodes, the goal of a reconfiguration scheme is to construct the largest subring among the non-faulty nodes using both regular and bypass links. If the faults partition the network into components, such a subring will be entirely within a component. The set of faulty nodes de...

Background and Aim: Cone beam computed tomography (CBCT) produces high-quality data in periodontal diagnosis and treatment planning. The aim of this study was to compare the accuracy of CBCT with intraoral digital and conventional radiography in the measurement of periodontal bone defects.  Methods and Materials: In this diagnostic research, two hundred and eighteen artificial osseous d...

In this paper we investigate the observation problems for a class of nonlinear Lipschitz systems, subject to network constraints. In order to address this problem, an impulsive observer is designed, making use of the event–triggered technique in order to diminish the network usage. The proposed observer ensures practical state estimation. The output sampling is done on a periodic basis, but the...