Table of content

IRAQI JOURNAL OF COMPUTERS,COMMUNICATION AND CONTROL & SYSTEMS ENGINEERING

المجلة العراقية لهندسة الحاسبات والاتصالات والسيطرة والنظم

ISSN: 18119212
Publisher: University of Technology
Faculty: Control and Systems Engineering
Language: English

This journal is Open Access

About

The Iraqi Journal of Computers,Communications,Control and Systems Engineering (IJCCCE) is a quarterly engineering journal issued by the University of Technology /Baghdad ,aiming to enrich the knowledge in computer,communication and control fields .

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Contact info

IRAQI JOURNAL OF COMPUTERS,COMMUNICATION AND CONTROL & SYSTEMS ENGINEERING
University of Technology P.O.BOX. 18310
Baghdad,Iraq .
ijccce_uot@uotechnology.edu.iq
ijccce_uot@yahoo.com

Table of content: 2019 volume:19 issue:2

Article
Multistage Tree Model for Crime Dataset in Iraq

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Abstract

This research deals with the using of correlation measurement that leads to describing the degree of relationship between variables, quantities or qualities. Therefore, we implement a simple correlation coefficient and conditional correlation to introduce a regular vine copula, which gives different tree structures. Two methods to select tree structures are introduced. The first one adopts the Partial Correlation Constant (PCC) with constant, while the second method depends on the estimation of summation pathway. The proposed method makes modification on Diβmann’s algorithm to increase the dependency on each level of the tree using rank correlation measurement. Both methods are adopted to construct the best model with more than three dimensions based on the available label crime dataset in Iraq. The selected model is used for selecting the suitable tree model and generating a decision with the low dimensionality of variables.


Article
Estimation of Stator Winding Temperature of a Three-Phase Induction Motor

Authors: Amer Mejbel Ali --- Afrah Thamer Abdullah
Pages: 9-17
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Abstract

This paper adopted a thermal network method (TNM) based on Motor-CAD with MATLAB/Simulink software, and finite element method (FEM) based on Motor- CAD with Flux2D software, to estimate the stator winding temperature of a totally enclosed fan-cooled (TEFC), squirrel cage, three-phase induction motor. The three software packages were adopted successfully with a good agreement among their results resulting in preferring using Motor-CAD in obtaining results, and using Flux2D with MATLAB to validate these results. The success of triple-software methodology will give the induction motor designer a well-validated tool in attaining a safe motor operation without exceeding the maximum allowable stator winding temperature rise, and without using an experimental test based on an expensive manufacturing motor.


Article
Design a Different Structures Controller for Controlled Systems Using a Spiking Neural Network

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Abstract

The design and simulation of the Spiking Neural Network (SNN) are proposed in this paper to control a plant without and with load. The proposed controller is performed using Spike Response Model. SNNs are more powerful than conventional artificial neural networks since they use fewer nodes to solve the same problem. The proposed controller is implemented using SNN to work with different structures as P, PI, PD or PID like to control linear and nonlinear models. This controller is designed in discrete form and has three inputs (error, integral of error and derivative of error) and has one output. The type of controller, number of hidden nodes, and number of synapses are set using external inputs. Sampling time is set according to the controlled model. Social-Spider Optimization algorithm is applied for learning the weights of the SNN layers. The proposed controller is tested with different linear and nonlinear models and different reference signals. Simulation results proved the efficiency of the suggested controller to reach accurate responses with minimum Mean Squared Error, small structure and minimum number of epochs under no load and load conditions.


Article
Comparative Study of Pulse Shaping Filters in FBMC

Authors: Hadi T. Ziboon --- Mohammed Kasim Al-Haddad
Pages: 30-40
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Abstract

Filter Bank Multicarrier (FBMC) is a multitone modulation technique that is expected to replace the Orthogonal Frequency Division Multiplexing (OFDM) due to its inherent characteristics that makes it immune to channel dispersive effect on the transmitted signal in both time and frequency. The most effective ingredient in the FBMC is the pulse shaping that the OFDM symbol lacks. In this paper, a comparative study is presented between different pulse shapes used in the FBMC like the RRC, PHYDIAS, IOTA and Hermite function alongside the conventional OFDM.


Article
Impact of fiber nonlinearity on the Performance of Mode Division Multiplexing systems

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Abstract

in this paper, an analytical model is developed to estimate a nonlinear phase noise (NPN) due to Kerr fiber nonlinearity and its interaction with amplifier noise in mode division multiplexing (MDM) systems. Our analysis uses generalized coupled multimode nonlinear Schrödinger equations (MM- NLSE) that describe the propagation of the mode superimposing in the optical fiber. The nonlinear phase noise versus channel power and transmission distance is evaluated by implementing our analytical model for LP01, LP11a, and LP11b spatial modes. Each mode carries a 4-QAM signal at a symbol rate of 20 Gsymbol/s. The results reveal that LP11 mode has a lower phase noise variance than LP01 mode over entire transmission distances. Finally, the error vector magnitude (EVM) versus channel power is quantified using an analytical model.


Article
Performance of Solar Module withPresence of Two Types of Reflectors in Concentrator System

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Abstract

Any work to improve the performance of the solar modules could add to their economic competitiveness against fossil fuels. In the present work the performance of PV solar module was improved by using V-Trough concentrator system (CPV) which moved by two axis tracking system. The concentrator consists of two flat reflectors of area 2 m2 for each one with geometric concentration ratio of 2X. To optimize the performance of the V-Trough CPV systems, two types of reflector material, Aluminum and mirror (glass coated by silver nitrate) were used. The results indicated that the temperature of PV reference module was higher than the ambient temperature by 27oC but there is too small difference in temperature between the tracking PV module with the reference which ranged to 2oC, while the temperature of the CPV system was higher than reference by 37oC. The temperature of the PV module under mirror reflectors was lower than module combined with Aluminum reflectors by 3oC. As a result of arising of the temperature of CPV system in compare with PV reference module, the open circuit voltage was droop by 0.7 V, 0.5 V for PV module under mirror and Aluminum reflectors respectively. The reflectors increased the short circuit current values by 2.1 A, 2.6 A for PV module combined with mirror and Aluminum reflectors respectively. Accordingly the performance (as an average daily gain of output power) of the PV solar module was improved by using V-Trough CPV system, 44%, 34% by using Aluminum and mirror reflectors respectively.


Article
A Comparative Study of PI and IP Controllers For Field Oriented Control of Three Phase Induction Motor

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Abstract

In this paper, Field Oriented Control (FOC) of 3-phase induction motor is controlled by using (PI) and (I-P). These controllers are established with the help of MATLAB/SIMULINK. The gains value obtained by the trial and error method of PIcontroller and Particle Swarm Optimization (PSO) technique is used in this paper for designing I-P controllers that give better performance. PSO technique was proposed to tune the optimal gains of I-P controller and state feedback gains. A comparison between two controllers is presented. From simulation results, the advantages and disadvantages of both controllers are investigated to explain the characteristic of the two methods. The operation perforamcnes of the two proposed controller systems have been examined in terms of the motor torque, current ripples and momentary responses to load toque variants.


Article
Indoor Localization System Using Wi-Fi Technology

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Abstract

Recently, indoor localization has witnessed an increase in interest, due to the potential wide range of using in different applications, such as Internet of Things (IoT). It is also providing a solution for the absence of Global Positioning System (GPS) signals inside buildings. Different techniques have been used for performing the indoor localization, such as sensors and wireless technologies. In this paper, an indoor localization and object tracking system is proposed based on WiFi transmission technique. It is done by distributing different WiFi sources around the building to read the data of the tracked objects. This is to measure the distance between the WiFi receiver and the object to allocate and track it efficiently. The test results show that the proposed system is working in an efficient way with low cost.


Article
Bandwidth Utilization Prediction in LAN Network Using Time Series Modeling

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Abstract

monitoring the behavior of computer networks is essential for problem identification and optimal management. Part of this behavior to be monitored is the utilization of the network bandwidth. Several techniques are used to model and forecast network traffic such as time series models, modern data mining techniques, soft computing approaches, and neural networks are used for network traffic analysis and prediction. Efficient bandwidth utilization and optimization are very interesting research issues in effective networks because bandwidth is one of the most required and expensive Internet components needed today. It is generally known that the higher the bandwidth available, the better the network performance, thus an essential aid for network design and bandwidth wastage control and a need for trac models which can capture the characteristics is necessary. In this paper, a time series prediction models were proposed for LAN office network bandwidth utilization. The proposed prediction models are tested by using evaluation metrics used in time series such as MSE and performance evaluation plot. Testing results show that the proposed models can enhance the detection of bandwidth traffic and provide an efficient tool for bandwidth utilization.


Article
Reducing Short Circuit Level in 400kV Iraqi Grid System by Using FACTS Device

Authors: Mohanad Sh. Tarad Al-Aasam --- Inaam I. Ali
Pages: 90-99
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Abstract

Electrical power systems are different in their sizes because of their amount of generation power stations, substations, transmission lines and loads. Therefore, these factors may impact on short circuit levels values. Capacity of power stations and dummy transmission lines in Extra high voltage grid (400kV) of the Iraqi Electrical power grids cause high short circuit levels values such that exceed both rating of the peak and breaking capacity of switchgear equipment's. Reduction of short-circuit levels by using Fast-acting Flexible Alternating Current Transmission Systems (FACTS) types devices in power grids maintain the operation of power grids with acceptable value of short circuit levels for their electrical equipment's and preventing cascading event outages which may lead to blackouts. This paper mainly studies strategies on how to add Short Circuit Current Limiter (SCCL) device by determining its number, value and location of connection in power grids by programing with (PSS™E version 30.3 Package Program). IEEE 25-bus system is used for testing the adding series SCCL at power transmission lines method procedure. The results of adding series SCCL with power transmission lines give significant reducing short circuit levels for the stations have highest short circuit levels in order to prevent the blackouts of overall power grid.

Table of content: volume:19 issue:2