Majlesi Journal of Electrical EngineeringAnalysis of Waveguide Filters with Dielectric Resonators Using Multimode Contour Integral MethodVolume 1 (2007)Issue 1, June 200720240228Analysis of Waveguide Filters with Dielectric Resonators Using Multimode Contour Integral Method10.1234/mjee.v1i1.18ENJournal Article20240228The contour integral (CI) method is developed to analyze H-plane waveguide circuits filled with inhomogeneous dielectric such as circuits including full height dielectric posts. In order to reduce the computational costs, the multimode CI method, which considers the effect of higher order TEn0 modes, is introduced and we present a hybrid method based on multimode CI and mode matching (MM) techniques. The accuracy of method is validated by comparison of results with those reported in literatures.Majlesi Journal of Electrical EngineeringSeparately Modeling of a Five-Phase Series Connected Two- Induction Motor with Completely Decoupled OperationVolume 1 (2007)Issue 1, June 200720240228Separately Modeling of a Five-Phase Series Connected Two- Induction Motor with Completely Decoupled Operation10.1234/mjee.v1i1.49ENJournal Article20240228It has been shown recently that in many industrial factories, for example rolling and looming, single controller and drive must control a number of multi-phase machines simultaneously. The major difficulty in utilizing this approach is using common single controller for two motors. The most recent solution for this problem is to serialize the stator windings in an appropriate manner. Replacing three-phase machines with multi-phase ones opens the way to implement this method. In addition, a number of multi-phase machines can be controlled independently, by a suitable drive switching. In this paper, a new modeling method is presented to models these two machines separately. Then, every machine has been simulated in any arbitrary reference frame. Finally, the two methods are compared and the simulation results evince the advantages of the suggested method. Furthermore, designing a controller in separate models alleviates the design burden in comparison to previous methods.Majlesi Journal of Electrical EngineeringNew Method for Blood Vessels Segmentation in Retinal ImagesVolume 1 (2007)Issue 1, June 200720240228New Method for Blood Vessels Segmentation in Retinal Images10.1234/mjee.v1i1.47ENHadiFarzinTrent UniversityHamidAbrishami MoghaddamKhaje Nasir Toosi University of TechnologyMohammad-ShahramMoinIran Telecommunication Research CenterJournal Article20240228Retinal image analysis has many applications in various fields such as biometrics or medical diagnosis. Blood vessel segmentation is the first and important stage in these analyses. This paper presents an efficient method for automatic segmentation of blood vessels in retinal images. In the first stage, the proposed algorithm uses a template matching technique for reducing the effect of optical disk in the image. Then, it uses a new local processing operation based on the statistical properties of the image in order to enhance the vessel/background contrast. Next morphological operations are used for filling the vessel spaces caused by the previous stages. Finally, a binary image containing blood vessels is resulted by histogram thresholding of the contrast enhanced image. Evaluation of the results obtained by the new segmentation algorithm demonstrated its superior sensitivity and comparable accuracy with respect to the results of the previous works.Majlesi Journal of Electrical EngineeringA Combinatorial Method Based on Function Block and Object-Orientation Concepts for Modeling Distributed Real-Time Control SystemsVolume 1 (2007)Issue 1, June 200720240228A Combinatorial Method Based on Function Block and Object-Orientation Concepts for Modeling Distributed Real-Time Control Systems10.1234/mjee.v1i1.48ENJournal Article20240228This paper presents a novel modeling method for distributed real-time control systems. The method uses function blocks model of IEC 61499 standard related to industrial control systems in combination with object-oriented approach for software production. The new modeling technique is named OO+FB. This method models distribution characteristics and real-time constraints accurately and provides a proper background for analysis and design of controllers. The new methodology, gives a complete framework for facing with modern industrial processes, using the good characteristics of both fundamental method. In this paper, different steps of OO+FB is described and advantages of using such a model is discussed, so a reliable approach is introduced for modeling.Majlesi Journal of Electrical EngineeringRobust power system stabilizer design with H∞ theoryVolume 1 (2007)Issue 1, June 200720240228Robust power system stabilizer design with H∞ theory10.1234/mjee.v1i1.66ENJournal Article20240228In this paper, the H∞ robust control technique is presented to design a power system stabilizer. First, the H∞ standard problem is expressed and then, the modeling and stability analysis of power systems are studied. Finally, a H∞ power system stabilizer is designed and the simulation results are discussed.Majlesi Journal of Electrical EngineeringSOI DEVICE SIMULATION OF AN AREA EFFICIENT BODY CONTACT Volume 1 (2007)Issue 1, June 200720240228SOI DEVICE SIMULATION OF AN AREA EFFICIENT BODY CONTACT 10.1234/mjee.v1i1.52ENJournal Article20240228We have used three-dimensional simulation to investigate application of a new body contact to SOI devices. Performance characteristics of the new body contact on high-voltage SOI devices were studied. Our comparative investigation showed increased current drive, improved cutoff frequency, reduced on-resistance while attaining satisfactory breakdown voltage. The new body contact is applicable to both high and low voltage SOI MOSFETs.Majlesi Journal of Electrical EngineeringA Method for Analog Implementation of Centroid Tracking Algorithm in a Video SignalVolume 1 (2007)Issue 1, June 200720240228A Method for Analog Implementation of Centroid Tracking Algorithm in a Video Signal10.1234/mjee.v1i1.50ENJournal Article20240228The main goal of a video tracking algorithm is finding the location of a predefined target in successive video frames. Centroid pointing is one of the most efficient methods in the target tracking. This method can be simply implemented by a digital video processing system that includes a video memory and a powerful digital processor. Usually, the cost and the complexity of the digital video processor is high and in some applications, using analog video processor that includes only electronic devices like OPAMP, diodes, transistors, resistors and capacitors has lower cost, more efficient and more reliable. Implementing of the centroid in an analog video processor is not as simple as digital one, therefore in this paper, we introduce a novel formulation of the centroid that can be implemented in an analog video processor. We simulate the proposed method by MatLab simulink and compare the results with the area-based tracking that is usually used in analog video processors. The simulation results show that the proposed method is more reliable and accurate.Majlesi Journal of Electrical EngineeringEstimation of Network Delay in Control Systems and Reducing Network’s Effects by Using Data Sending ManagementVolume 1 (2007)Issue 1, June 200720240228Estimation of Network Delay in Control Systems and Reducing Network’s Effects by Using Data Sending Management10.1234/mjee.v1i1.51ENJournal Article20240228This paper opens with introducing the structure of the network control systems and then the impact of the network on the system equations is simultaneously modeled and the factors affecting the network control systems, due to the existence of the network in the system, are examined. Next, a instantaneous approximation based on Kalman filter design is obtained, by considering the delay as random variable and by an appropriate modeling of network control system dynamics. For doing this, the impact of the network on the main system is modeled in a way that can be used for Kalman filter. Then, the impact of the network on the system performance is approximated based on the model and the Kalman filter. At last by using data sending management network's effect on control system is reduced.