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In this paper, we consider the problem of enhancing the filtering capacity of single standard beamformers for real base-band signals. Unfortunately, the standard smart arrays are not able to effectively minimize the effects of the complex noise in the array. In order to solve this problem, we analyze a parallel adaptive beamforming system based on complex nonlinear adaptive filters. In this design,...
Many methods have been introduced as economic load dispatchers. However, all these methods depend on the optimization field, where most of these studies mainly focus on how to strengthen the optimization algorithms themselves. This means the mystery key that segregate between the good and bad ELD solvers is the optimization algorithm itself. However, there is a practical fact known in many real power...
In this paper we propose an algorithm that generates reduced-order time-domain macromodels of nonlinear circuits. The reduction technique is done in two steps. In the first step, proper orthogonal decomposition is used to reduce the size of the nonlinear differential algebraic equations describing the circuit. In the second step, feedforward neural networks are used to model the behavior of the nonlinear...
Chemical coagulation process efficiently removes both natural organic matter and small colloidal particles that have negative impacts on taste, smell and appearance of treated water. The current practice requires regular manual intervention. In smaller WTPs, often serving remote communities, regular intervention by experienced operators is not feasible and, hence, coagulant overdosing and underdosing...
This manuscript investigates the effect of new investments on the locational marginal prices in the main interconnected system of Oman. The study includes modeling the existing transmission network and simulating system performance during peak period. In addition, the effect of renewable energy projects on locational marginal prices are simulated.
In this paper, a simple artificial neural network power system stabilizer (SANN-PSS) is implemented using a reduced order power system. Knowledge of the high bus voltage of a transformer is employed to alter the Heffron-Phillips' method. Furthermore, a reduction technique is applied to change the power system's sequence, and increase the power system's stability by adjusting the controller's parameters...
In online social networks (OSNs), highly-connected users are generally more capable to trigger viral diffusion. However, recent research demonstrates that ordinary users who only have a few connections can also cause large-scale diffusion. In this paper, we study the relation between the global spreading influence and the local connections of users to theoretically explain this phenomenon. We focus...
The main theme of this paper is summarizing the results on examining regularity of functional equations with computer algebra systems. These methods can be found in the PhD thesis and partially in some articles of the author. Additionally it deals with some other applications of CAS. There were used Maple(ver 15.0) and Sage(several versions) systems.
Web-based service-oriented grid computing refers to a distributed computing system comprising a collection of interconnected and virtual computers that provides web-based services via the Internet. These services are based on Service Level Agreements (SLAs) established by negotiation between service providers and consumers. SLAs are contractual obligations that define the mutually agreed understandings...
Service-dominant logic, called S-D logic, proposed a new thought oftheoretical foundation for service economy from a service centricviewpoint, but basic terms and their relationship are not representedin technical form. We first formalize S-D logic in a mathematical form. In addition to the terms that have already been introduced in S-D logic, we define terms of 'capability' and 'potential'. These...
This paper presents a system that automatically assesses multi-step answers to algebra questions. The system requires teacher involvement only during the question set-up stage. Two types of algebra questions are currently supported: questions with linear equations containing fractions, and questions with quadratic equations. The system evaluates each step of a student's answer and awards full/partial...
The design of a warehouse or distribution center (DC) has become an essential tool for the optimization of the supply chain in most industries. Energy consumption in this type of facilities is an important issue which has not received much attention in the scientific community which has focused instead in two-dimensional routing optimization. In this paper the problem of designing a rectangular warehouse...
Thermal convection and fluid flow in porous media has gained increasing research interest in recent years due to the presence of porous media in many engineering applications. Rough set theory has been regarded as a powerful feasible and effective methodology in the performance of data mining and knowledge discovery activities. This paper introduce a method for building knowledge for the rate of heat...
Usually, electrical design engineer must take care about three-phase balancing before sending the final version of the LV electric wiring. The conventional method used to verify this task was just to divide all single-phase electrical-loads between the three phases without focusing the consideration on daily load-flow variation of the electrical-loads. For this, this paper describes a necessary new...
Nowadays, web has become widespread in terms of availability of contents related to every field. Also a large repository of web contents is turned up as a most challenging tool for searching and retrieving information. For scientists and researchers, resource or content searching has been very important. Todays, market is full of variant search tools over web having discrepancy in terms of working...
The traditional power flow and fault analysis methods fail to meet the requirements in both performance and accuracy aspects in the distribution network applications. This is due to the unbalanced multiphase nature of the distribution network and also due to the emerging penetration of renewable generation at the distribution level. This paper proposes a comprehensive method for power flow solution...
Involving stakeholders in decision-making at planning workshops requires a computer system to respond quickly to various scenarios proposed by participants. Due to the increasing complexity of urban systems, such planning support often faces the challenges of "big data" and poor computational performance. This paper proposes a new approach using parallel processing techniques (i.e. MPI Message...
The conventional digital computational hardware blocks with different structures are destined to produce precise results. For almost any multimedia application the human eye is the receiver of information. Owing to the fact that human eye is capable of gathering intended information from slightly erroneous output also, this work deals with the design of low power inexact 4:2 compressor using approximation...
In this paper, nature inspired firefly algorithm has been used for designing of controllers for set-point response and stability purpose. Using firefly algorithm, we have tuned the parameters of above two controllers. A performance criteria integral square error (ISE) is optimized using firefly optimization technique. For the optimum value of ISE, controller parameters are selected. Routh Stability...
One of the main problems in minimum invasive robotic surgery is effective control of the tracking error due to hand tremor. In this paper we review issues of hand tremor using surgical robot and propose a novel technique using wavelet transform with minimum coefficients to get a tremor free signal. In the parameter learning phase the error is minimized with minimum wavelet compression and as time...
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