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In this paper, probability distributions of new and handoff call channel holding times in mobile cellular networks are derived under the assumption that cell dwell time has generalized Coxian distribution. It is shown that when cell dwell time has a generalized Coxian distribution, the resulting residual cell dwell time has generalized Coxian distribution as well. Furthermore, both new and handoff...
We consider two different users sharing the same spectrum resource, interfering with each other, under outage performance requirements for both the users. We derive a practical condition to enable the spectrum-sharing under simultaneous outage performance. Furthermore, when the condition is fulfilled, we provide equations to define the two-dimensional region of allocated powers (P1, P2), for the two...
In the paper, the authors propose a novel algorithm for synthesis of 2-D lossless FIR filter transfer function matrix. The synthesis based on 2-D embedding technique is used to obtain a FIR filter transfer function matrix which possess lossless properties. The matrix is composed of desired 2-D linear phase, quadrant symmetry transfer function and additional nonlinear phase transfer functions. A Newton...
Among the approaches used to analyze biomedical signals, e.g. electroencephalogram, there are methods based on fractal dimension (FD) calculation. One of the main drawbacks of these methods is the requirement for long duration of the analyzed signal. To analyze events of brief duration in real-time mode and to apply the results obtained directly in the time domain, thus providing an easier interpretation...
Many engineering applications requires solving the fuzzy equations. A method to solve first order fuzzy linear equations using modal interval approach is suggested. The modal interval arithmetic is applied to solve these fuzzy equations, for each ??-cut, which is computationally efficient. Some basic definitions and operations of modal interval arithmetic are included here. Simulation examples validates...
In the present study we propose a new hybrid version of differential evolution (DE) and particle swarm optimization (PSO) algorithms. In the proposed algorithm named as hybrid differential evolution (HDE) a `switchover constant' called ?? is defined. HDE starts as the basic DE algorithm which switches over to PSO when ?? is activated. The constant ?? on the other hand is activated at a point where...
Optimization problems are ubiquitous and consequential. In fact every sphere of human activity that can be quantified can be formulated as an optimization problem. The focus of this work is on Global Optimization which is not only desirable but also necessary in many cases. In the past few decades several Global optimization algorithms have been suggested in literature out of which stochastic, population...
Differential Evolution (DE) is generally considered as a reliable, accurate and robust optimization technique. However, the algorithm suffers from slow convergence rate and takes large computational time for optimizing the computationally expensive objective functions. Therefore, an attempt to speed up DE is considered necessary. This research introduces a modified differential evolution, called Ant...
Most optimization problems have constraints of different types (e.g., physical, time, geometric, etc.), which modify the shape of the search space. We propose an ecologically inspired invasive weed optimization (IWO) algorithm to solve the constrained real-parameter optimization problems. Central to our approach is a parameter-free penalty function that we introduce. The adaptive nature of the penalty...
This paper investigates the effect of initiating the population with various probability distributions and low discrepancy sequences on the behavior of Particle Swarm Optimization (PSO). The probability distributions: Gaussian, Exponential, Beta and Gamma distribution and the low discrepancy sequences: Van der Corput and Sobol are considered in this study. Based on these probability distributions,...
In this paper we consider a class of dynamic vehicle routing problems, in which a number of mobile agents in the plane must visit target points generated over time by a stochastic process. It is desired to design motion coordination strategies in order to minimize the expected time between the appearance of a target point and the time it is visited by one of the agents. We cast the problem as a spatial...
Convex optimization has been widely used to model bandwidth allocation policies among TCP flows in the Internet. When the offered load is less than capacity, stochastic stability of networks using such policies has been established for exponentially distributed file sizes. The problem has remained open for general file size distributions, which is very relevant as it is well known that Internet file...
Mechanisms for allocation of one or many goods to a number of agents are proposed in this paper. The goal is to propose mechanisms in a general setting where the goods might be divisible or indivisible. A mechanism in the Groves class that is dominant strategy incentive compatible and almost budget balanced is obtained. In the case of one or more indivisible goods, the proposed mechanisms fall back...
We study a class of LQG control problems with N decision makers possessing different dynamics. The basic objective is to minimize a social cost function as the sum of N individual costs containing mean field coupling. For large N, the exact socially optimal solution (which also has the Pareto optimality property) requires centralized information and this leads to high computational complexity. In...
The classification of quaternary [21s+t,3,d] codes with dges16s and without zero coordinates is reduced to the classification of quaternary [21c(3,s,t)+t,k,d] code for sges1 and 0lestles20, where c(3,s,t)les min{s, 3t} is a function of 3, s, and t. Quaternary optimal Hermitian self-orthogonal codes are characterized by systems of linear equations. Based on these two results, the complete classification...
The relationship between Leadership and Personal Initiative was explored. 255 employees and 45 superiors were surveyed by MLQ (5X), work-related self-efficacy questionnaire and personal initiative questionnaire. The results showed that leadership had close relationship with personal initiative, transformational leadership had augmentation validity based on transactional leadership in predicting personal...
The classification of quaternary [21s+t,3,d] codes with dges16s and without zero coordinates is reduced to the classification of quaternary [21c(3,s,t)+t,k,d] code for sges1 and 0lestles20, where c(3,s,t)les min{s, 3t} is a function of 3, s, and t. Quaternary optimal Hermitian self-orthogonal codes are characterized by systems of linear equations. Based on these two results, the complete classification...
We consider the problem of the correspondence leaning of two high-dimensional data sets via the manifold leaning techniques. Itpsilas convenient for us to find the shared latent structure of the high-dimensional data sets, if they can be aligned in a uniformed low-dimensional data space. A local affine technique to address this problem is present here. Our method preserves more geometrical knowledge...
Due to the rapid increase of population and the necessity of providing adequate drinkable water supplies, which meet hygiene conditions, modern techniques are applied for water treatment. In particular, this study introduces a flexible model for describing, calculating and estimating the volume of water in distribution tanks through all phases of treatment processes. The model considers a typical...
Program slicing, a well-known technique, originally introduced by Weiser M., has already been widely used in numerous software engineering areas. With the development of research, the concept of program slicing is extended, and its application domains are broadened. This paper proposes a method for slicing Z formal specifications based on relations selection, relations projection and relations connection...
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