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This paper presents architecture of CORDIC, embedded with a scaling unit that has only minimal number of adders and shifters. It can be implemented in rotation mode as well as vectoring mode. The purpose of the design is to get a scaling free CORDIC unit preserving the design of original algorithm. The proposed design has a considerable reduction in hardware when compared with other scaling free architectures...
Cognitive Network is one of the most prevailing development directions in the future network, prominent in enhancing the utilization of the network resource. Although the research on routing mechanism in Cognitive Network arises more attention in the recent years, the current mechanism provides limited methods for ameliorating the instability performance caused by the mobility of the Cognitive Radio...
A resilient control system is one that maintains state awareness and an accepted level of operational normalcy in response to unexpected disturbances. There has recently been great interest in event-triggered control for networked systems. It is unclear, however, whether event-triggering is appropriate for resilient control because of the sporadic nature of the feedback. This paper examines the bit-rates...
This paper investigates an optimal decentralized control problem for a system with B-matrices dependent on stochastic parameters. It is assumed that these parameters are independent in time and available locally to each controller. The objective is to find a decentralized state feedback control policy that minimizes a multi step quadratic cost function. We first solve this problem for the case of...
The effects of time delay in the continuous part of a pulse-modulated model of non-basal endocrine feedback regulation are investigated. Conditions for the existence and local orbital stability of periodical solutions with m impulses in the least period (m-cycles) are derived. Applied to the case of testosterone regulation in the human male, the model indicates that increasing time delays in the system...
An earlier investigation on leader-follower consensus protocols for double integrators with multiple time delays [1] is revisited in this paper from two completely different and novel perspectives. First, the crucial stability analysis of time delayed system is replaced with a recent technique called the Cluster Treatment of Characteristic Roots (CTCR). CTCR paradigm is pursued after a block-diagonalization...
Future growth of the Internet is likely to be constrained by its own energy consumption. As shown in recent studies, by adopting burst switching technologies, energy consumption of the core network could be reduced. In this study we first analyse the relationship between burst size, arrival rate, and energy consumption of a core router port in a burst switching (BS) network. A novel mechanism is then...
Energy consumption is one of the main concerns that refrain users from fully exploiting their smart phone capabilities. Guided by energy measurements on smart phones, which show that some services performed in parallel require less energy than their stand-alone executions, we investigate the possibility to delay some services to the time when other services have already been scheduled in such a way...
As the typical anomaly detection methods using statistics, entropy and based method has been researched and reported with their performance properties for anomaly attacks. In this research, we compare the time complexity of two our proposed detection method aiming to evaluate the performance of our system. Our previous researches have clarified that the source IP address and destination port...
Traditionally in routing approaches, each node allows a maximum load through the selected route. The existing routing approaches in cognitive radio networks (CRN) do not take into account spectrum trading as well as spectrum competition among licensed users (PUs). This paper introduces a novel routing algorithm that is based on spectrum trading and spectrum competition for cognitive radio networks...
This paper proposes a closed-loop frequency-based method for parametric identification of Wiener type plants with a transport delay in the linear part using a relay feedback. The method is a generalization of Ziegler Nichols' (ZN) experiment, with relay added in the control loop. It provides a simultaneous estimation of the linear plant dynamic, value of the time delay and approximate model of the...
This paper presents a new type observer design by using only the sampled delayed measurements where the delay value is different of the sampling period. This proposed piecewise continuous observer, called Piecewise Continuous Systems and derived by using the theory of a particular hybrid systems characterized by autonomous switchings and controlled impulses, has a very simple structure and can be...
This paper proposes a mechanism on reducing power consumption by using threshold and timer in home gateway. Traffic consists of real time and non-real time traffic. Proposed mechanism uses sleep mode, which can be extracted from the traffic with a protocol features and also takes advantage of buffer threshold mechanism and timer constraint for extending sleep mode. The extended sleep mode can save...
Generalized function projective synchronization of coupled chaotic systems with parameter mismatch, time-delay and stochastic perturbation is investigated. The synchronization is realized by analyzing the stochastic stability of the error system. According to the invariance principle of the stochastic differential equation, the unknown parameters update laws and the control laws are proposed. The...
Demands for avionics Wavelength Division Multiplexing (WDM) network have been increasing dramatically in multicasting applications such as the in-flight multimedia in recent years. The topic of multicasting routing problem has been investigated with enthusiasm, because a proper design of routing can not only make full use of the resource, but also improve the performance of networks. However, different...
This article deals with the radiation of sound from ultrasonic transducers located on a flat surface and bounding a shear flow. The aim of the experiments is to measure time delays between flushed transducers in order to characterize flow velocity. Considering that the sound has an infinitely small wavelength, comparison between numerical (simulated using Matlab) and experimental results shows that...
IMS (IP multimedia subsystem) is a main trend of development NGN. The base of IMS is an Internet Protocol which initially did not provide support for quality of service. However, for the transmission of multimedia streams is necessary to ensure a given level of quality of service (QoS). Therefore, IMS QoS estimation is a necessary task but a high complexity of network topologies and a large number...
The ongoing substitution of conventional power plants by renewable energy resources (RES) in Europe leads to new challenges for the operation of future power systems. Grid auxiliary services like frequency control which are traditionally provided by a few dedicated large power plants may in the future be realized by smaller generation units or loads. This paper discusses the applicability of small...
Recently, it has been studied how to reduce the probability of interception and to increase the efficient security in the wireless digital communication systems. Among the possible approaches for the information security, the chaotic signal can be used to encode information very efficiently in many ways due to the inherent characteristic of irregularity. In this paper, in noise and interference environment,...
In this paper, we will discuss the oscillation of solutions of higher-order nonlinear delay dynamic equations on time scales, which have the following form $$S_n^\Delta(t, x)+p(t)f(x(\tau(t)))=0.$$ We will establish some oscillation criteria for these dynamic equations. Our results improve some previously obtained ones.
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