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In cognitive radio networks, spectrum sensing plays a crucial role in the discovery of spectrum opportunities for secondary systems (or unlicensed systems). The performance of spectrum sensing is characterized by both accuracy and efficiency, and more importantly the time taken to make a decision and also the complexity involved in doing so. In this work we propose a simple detection technique based...
This paper is concerned on Xilinx FPGA design for SPWM control of Single-Phase Matrix Converter (SPMC). The Sinusoidal Pulse Width Modulation (SPWM) technique is used to synthesize the output voltage. The power circuit uses the Insulated Gate Bipolar Transistor (IGBT) as switching device in the SPMC implementation. Safe-commutation strategy was incorporated to solve switching transients. A Xilinx...
This paper proposes a hybrid real-coded quantum evolutionary algorithm (HRCQEA) for optimizing complex functions on the basis of the concept of quantum computing such as qubits and superposition of states and particle swarm optimization (PSO). It combines PSO with real-coded quantum evolutionary algorithm (RCQEA) to improve the performance of RCQEA. The main idea of HRCQEA is to embed the evolutionary...
This presentation summarizes some recent advances of computational electromagnetics for complex structures encountered in circuits. The results are applied for multi-scale computations encountered in computer circuits and packaging.
This paper intends to propose a novel clustering method based on ant colony (AC) algorithm. A new approach called TT-transform based time frequency analysis is used in processing the non-stationary power signal disturbances. The time-time transform is the inverse Fourier transform of S-transform. The proposed model is demonstrated using feature vector from the domain of power signal analysis, yielding...
In this paper, a novel Kalman filter-based power allocation scheme is developed for cooperative networks with inaccurate channel state information (CSI). The channel estimation error is embedded in the power allocation model which results in uncertain linear and time varying system. The robust and constrained Kalman filter (RCKF) scheme adapts the allocated power to channel variation while satisfying...
In verification of hybrid discrete-continuous and embedded control systems, one encounters decision problems involving non-linear constraints. We propose an efficient decision procedure (CORD) for such decisions problems using CORDIC algorithms, and an off-the-shelf SMT(LA) (Satisfiability Modulo Theory for Linear Arithmetic) solver, for given precision requirements. We first translate the non-linear...
Alzheimer's disease (AD) is the most common form of dementia due to progressive and fatal brain disease. In this work a standard set of mathematical equations in the form of percentage is defined to predict susceptibility of AD on patient candidates. Two parameters were used as a basis for AD prediction; the biomarker and risk factor. Datasets used in this work are based entirely from those obtained...
Conventional cryptography uses encryption key, which are long bit strings and are very hard to memorize such a long random numbers. Also it can be easily attacked by using the brute force search or technique. Instead of traditional cryptography, biometric e.g. fingerprint, iris, face, voice etc uniquely identifies a person and a secure method for stream cipher, because Biometric characteristics are...
The main purpose of this paper is to investigate the effectiveness of the quarter-sweep arithmetic Mean (QSAM) iterative method by using the implicit finite difference approximation in order to solve fourth-order parabolic equations. The basic idea and the formulation of this method are also presented. In fact, implementations of full-sweep, half-sweep, and quarter-sweep arithmetic mean methods, namely...
In this paper, a new fuzzy optimization based methodology called as a modified S-curve membership function has been utilized in an industrial production problems of oil company. The major contribution of this paper is on the optimization of profit function with respect to uncertain resource variables and technological coefficients. Three cases have been thoroughly studied in this paper. Comparative...
Various cortical measures such as cortical thickness are routinely computed along the vertices of cortical surface meshes. These metrics are used in surface-based morphometric studies. If one wishes to compare the surface-based morphometric studies to 3D volume-based studies at a voxel level, 3D interpolation of the sparsely sampled 2D cortical data is needed. In this paper, we have developed a new...
Cumulants are gaining in popularity for use in stochastic control and game theory. They also have been effective in application to building and vibration control problems. Much of the work has been done for the finite time horizon case. In this paper, cost cumulants will be used on a discounted cost function. The control will be concerned with the first two cumulants, the mean and variance. The approach...
We provide a simple and accurate analytical model for multi-cell IEEE 802.11 WLANs. Our model applies if the cell radius, R, is much smaller than the carrier sensing range, Rcs. We argue that, the condition Rcs >> R is likely to hold in a dense deployment of access points (APs). We develop a scalable cell level model for such WLANs with saturated nodes as well as for TCP-controlled long file...
To model the benefit accrued due to limited rate feedback on the information transfer of optimal `input covariance matrices' from a channel-aware receiver to the transmitting users in a multiple-access channel, we study the distortion-rate tradeoff of a source uniformly distributed over multivariate generalizations of PF(n,p2) (the set of positive semi-definite matrices with a trace constraint) and...
In this paper the effect of the gate length on the operation of SOI-MOSFETs is evaluated via simulations. Three transistors with gate lengths 100, 200 and 500 nm are simulated. Simulations show that with a fixed channel length, when the gate length is increased, the curve slope ID-VGS is increased, and therefore the transistor trans-conductance increases. Moreover, with increasing the gate length,...
This paper presents a novel extended Kalman filter based method for estimating and tracking the RLC load resonance frequency. Assuming the load like an RLC circuit, state-space equations of the system is derived. A nonlinear time-variant model of the circuit is developed and an extended Kalman filter is performed to predict the performance of the system by estimating the real-time resonance frequency...
Haptic feedback can be a critical component of virtual environments used in cognitive research, rehabilitation, military training, and entertainment. A limiting factor in the innovation and the acceptance of virtual environments with haptic feedback is the time and cost required to build them. This paper presents a development environment called iAcumen that supports a new approach for programming...
In modeling studies of vapor compression cycles, the momentum balance equation is usually ignored in the dynamic heat exchanger models. However, in micro-scale heat exchangers, significant pressure drop has been observed. In this paper, we investigate the effects of the momentum balance through a systematic study of the open loop stability of a heat exchanger. We consider 1D compressible fluid flow...
The problem of dirty paper coding (DPC) over the (multi-antenna) fading dirty paper channel (FDPC) Y = H (X + S) + Z is considered when there is imperfect knowledge of the channel state information H at the transmitter (CSIT). The case of FDPC with positive definite (p.d.) input covariance matrix was studied by the authors in a recent paper, and here the more general case of positive semi-definite...
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