Iraqi Journal for Electrical And Electronic Engineering

Vast number of researches deliberated the separation of speech mixtures due to the importance of this field
of research. Whereas its applications became widely used in our daily life; such as mobile conversation, video
conferences, and other distant communications. These sorts of applications may suffer from what is well known the
cocktail party problem. Independent component analysis (ICA) has been extensively used to overcome this problem and
many ICA algorithms based on different techniques have been developed in this context. Still coming up with some
suitable algorithms to separate speech mixed signals into their original ones is of great importance. Hence, this paper
utilizes thirty ICA algorithms for estimating the original speech signals from mixed ones, the estimation process is
carried out with the purpose of testing the robustness of the algorithms once against a different number of mixed signals
and another against different lengths of mixed signals. Three criteria namely Spearman correlation coefficient, signal
to interference ratio, and computational demand have been used for comparing the obtained results. The results of the
comparison were sufficient to signify some algorithms which are appropriate for the separation of speech mixtures.

This paper principally advises a simple and reliable control for Static Synchronous Compensator
(STATCOM) in a stand-alone wind driven self-excited induction generator power system. The control was proposed
based on instantaneous P-Q theory. The advised control enjoys the merits of robustness, reliability and simplicity.
The paper also proposes a dimensioning procedure for the STATCOM that involves advising an annotative
analytical expression for sizing the DC-link capacitor. This procedure has the advantages of applicability for
different reactive power compensators that depend on a separate DC-link in its operation. Comprehensive simulation
results in Matlab environment were illustrated for corroborating the performance of the advised control under
rigorous operating scenarios. The results show the feasibility, reliability and practicability of the proposed
controller.

Vehicular network security had spanned and covered a wide range of security related issues. Howeversolar energy harvesting Road Side Unit (RSU) security was not defined clearly, it is this aspect that is considered in this paper. In this work, we will suggest an RSU security model to protect it against different internal and external threats. The main goal is to protect RSU specific data (needed for its operation) as well as its functionality and accessibility. The suggested RSU security model must responds to many objectives, it should ensure that the administrative information exchanged is correct and undiscoverable (information authenticity and privacy), the source (e.g., VANET server) is who he claims to be (message integrity and source authentication) and the system is robust and available (using Intrusion Detection System (IDS)). In this paper, we suggest many techniques to strength RSU security and they were prototyped using an experimental model based on Ubicom IP2022 network processor development kit .

This paper deals with the navigation of a mobile robot in unknown environment using artificial potential
field method. The aim of this paper is to develop a complete method that allows the mobile robot to reach its goal
while avoiding unknown obstacles on its path. An approach proposed is introduced in this paper based on combing
the artificial potential field method with fuzzy logic controller to solve drawbacks of artificial potential field method
such as local minima problems, make an effective motion planner and improve the quality of the trajectory of mobile
robot

In this work, a new image encryption method using a combined multilevel permutation with stream cipher is
proposed. In the permutation algorithm, image is divided into blocks in each level and its blocks are rearranged by
using pseudorandom permutation method. A new non linear stream cipher algorithm is also proposed that is based on
combining several keys generated by Linear Feedback Shift Register (LFSR). The results shown that the proposed
algorithm has a high security feature and it is efficient for image encryption. Practical tests proved that the proposed
encryption algorithm is robust, provides high level of security and gives perfect reconstruction of the decrypted
image.

This work presents a healthcare monitoring system that can be used in an intensive care room. Biological
information represented by ECG signals is achieved by ECG acquisition part . AD620 Instrumentation Amplifier
selected due to its low current noise. The ECG signals of patients in the intensive care room are measured through
wireless nodes. A base node is connected to the nursing room computer via a USB port , and is programmed with a
specific firmware. The ECG signals are transferred wirelessly to the base node using nRF24L01+ wireless module.
So, the nurse staff has a real time information for each patient available in the intensive care room. A star
Wireless Sensor Network is designed for collecting ECG signals . ATmega328 MCU in the Arduino Uno board
used for this purpose. Internet for things used For transferring ECG signals to the remote doctor, a Virtual Privet
Network is established to connect the nursing room computer and the doctor computer . So, the patients
information kept secure. Although the constructed network is tested for ECG monitoring, but it can be used to
monitor any other signals.

Competitive trend towards restructuring and unbundling of transmission services has resulted in the need
renteto discover the impact of a particular generator to load. This paper initially presents the analysis of three diff
reactive power valuation methods namely, Modified Ybus, Virtual flow approach and Modified Power flow tracing to
compute the reactive power output from a particular generator to particular load. Among these methods, the
modified power flow electricity tracing method is identified as the best because of its various features. Secondly,
based on this Method, the opportunity cost for practical system is determined. Hence, this method can be useful in
providing additional insight into power system operation and can be used to modify existing tariffs of charging for
reactive power transmission loss and reactive power transmission services. Simulation and comparison results are
shown by taking IEEE 30 bus system as test system.

This paper suggests the use of the traditional parallel resonant dc link (PRDCL) circuit to give soft
switching to the Four-leg Space Vector Pulse Width Modulation (SVPWM) inverter. The proposed circuit provides a
short period of zero voltage across the inverter during the zero-vectors occurrence. The transition between the zero
and active vectors accomplished with zero- voltage condition (ZVC), this reduces the switching losses. Moreover, the
inverter output voltage Total Harmonic Distortion (THD) not affected by circuit operation, since the zero voltage
periods occur simultaneously with zero-vector periods. To confirm the results, balanced and unbalanced loads are
used. Matlab/Simulink model implemented for simulation.

In this paper, a proposed control strategy is presented to improve the performance of the
pulse width modulation (PWM) boost type rectifier when operating under different supply voltage
conditions (balanced, unbalanced, and distorted three-phase supply voltages). The proposed control
strategy is divided into two parts, the first part is voltage controller and the second part is current
controller. In the voltage controller, Repetitive Controller (RC) is used to reduce the even order
harmonics in the regulated output dc voltage so small output capacitor (filter) is used instead of large
capacitor. RC also reduces the even order harmonics which appear in the reflected dc current (IMAX),
this leads to reduce the odd order harmonics which appear in the input currents. While in the current
controller, Enhanced Phase Locked Loop (EPLL) technique is used to obtain sinusoidal and balanced
three phases, to construct the reference currents, which are in phase with the fundamental supply
voltages. Therefore, the supply-side power factor is kept close to unity. A proportional controller is
used to give excellent tracking between the line and the reference currents. The complete system with
the proposed control strategy are simulated using Matlab/Simulink. The results for the complete
system using repetitive voltage controller are obtained and compared to the results of the system with
the conventional voltage controller (Proportional-Integral (PI) controller connected in series with a
Low Pass Filter (LPF)). The results with the repetitive controller show better response and stable
operation in the steady state under different input voltage conditions, as well as in the transient
response under changing the load condition.

Network Simulator-2(NS-2) is one of the most popular simulation systems that is widely used in the network
community. C++ and the object-oriented Tool Command Language (TCL) are both used to write this simulator.
C++ works as a background for this simulator, whereas TCL is responsible for scheduling discrete events and
network configuration objects. The TCL language is used to write the code of the simulation scenario. NS-2 does not
present enough graphical interfaces that could help a researcher reduce the time spent on writing long TCL scripts.
Therefore, network researchers spend a great deal of time focusing on how to write the TCL simulation script, which
consequently makes the simulation process more difficult. This study presents a novel tool that enhances simulation
by using graphical interfaces. The graphical interface is used to create the network topology and convert it into a
TCL script. Thus, the process is visualized easily, efficiently, and quickly. This work describes the Network Topology
Tool(NTT),which is intended to help researchers who work under the network simulation environment of NS-2. In
such a scenario, researchers can create the network topology through an interactive graphical user interface and
also they can retrieve and edit it which considered a very important and unique service from the other previous
works. This tool will allow professional users to focus on the development of new algorithms or architectures rather
than spend time writing scripts for data processing.

Multidimensional Online analytical processing (MOLAP) technology is considered a good tool to produce
meaningful and quality results by using a multidimensional cube. The term “multidimensional cube” is used to refer
to the multiple layers of data that are used to show the result. This result is identified by high-level management to
increase the Iraqi court work and to improve its quality. The Iraqi court needs an analytical report to make a
strategic decision on case date, case type, case state, judge, criminal age, and criminal gender. Currently, MOLAP is
known as the best and strongest technique because it provides rapid, dynamic, and multiple analyses of data;
presents knowledge from different perspectives; comes up with data in time series intervals; and drills down into
multiple levels of data layers to present different types of details. The SQL Server Reporting Service (SSRS) presents
analysis reports based on the MOLAP cube. This paper focuses on designing and developing the analysis reports of
the court data system of the Republic of Iraq by using SSRS with SQL Server Analysis Service to create the MOLAP
cubes.

The electrical consumption in Basra is extremely nonlinear; so forecasting the monthly required of
electrical consumption in this city is very useful and critical issue. In this Article an intelligent techniques have been
proposed to predict the demand of electrical consumption of Basra city. Intelligent techniques including ANN and
Neuro-fuzzy structured trained. The result obtained had been compared with conventional Box-Jenkins models
(ARIMA models) as a statistical method used in time series analysis. ARIMA (Autoregressive integrated moving
average) is one of the statistical models that utilized in time series prediction during the last several decades. NeuroFuzzy
Modeling was used to build the prediction system, which give effective in improving the predict operation
efficiency. To train the prediction system, a historical data were used. The data representing the monthly electric
consumption in Basra city during the period from (Jan 2005 to Dec 2011). The data utilized to compare the proposed
model and the forecasting of demand for the subsequent two years (Jan 2012-Dec 2013). The results give the
efficiency of proposed methodology and show the good performance of the proposed Neuro-fuzzy method compared
with the traditional ARIMA method.

The problem of automatic signature recognition and verification has been extensively investigated due to the vitality
of this field of research. Handwritten signatures are broadly used in daily life as a secure way for personal identification. In this
paper a novel approach is proposed for handwritten signature recognition in an off-line environment based on Weightless
Neural Network (WNN) and feature extraction. This type of neural networks (NN) is characterized by its simplicity in design and
implementation. Whereas no weights, transfer functions and multipliers are required. Implementing the WNN needs only
Random Access Memory (RAM) slices. Moreover, the whole process of training can be accomplished with few numbers of
training samples and by presenting them once to the neural network. Employing the proposed approach in signature recognition
area yields promising results with rates of 99.67% and 99.55% for recognition of signatures that the network has trained on and
rejection of signatures that the network .has not trained on, respectively

In this paper, fuzzy Petri Net controller is used for Quadrotor system. The fuzzy Petrinet controller is
arranged in the velocity PID form. The optimal values for the fuzzy Petri Net controller parameters have been
achieved by using particle swarm optimization algorithm. In this paper, the reference trajectory is obtained from a
reference model that can be designed to have the ideal required response of the Quadrotor, also using the quadrotor
equations to find decoupling controller is first designed to reduce the effect of coupling between different inputs and
outputs of quadrotor. The system performance has been measured by MATLAB. Simulation results showed that the
FPN controller has a reasonable robustness against disturbances and good dynamic performance.

The rapid growth in microelectronics and crunching RISC in the field of bio-medical sciences
incorporated of soft tools to diagnose various parameters of human fluids. Conventional method of blood sample
analysis makes use of laboratory technique of titration, which is operator-dependent and results in lot of errors
depending on the skill of the technician. In order to eliminate the human errors involved in the conventional method,
in this paper an attempt has been made to present a capillary centrifuge technique driven by high speed DC motor fed
by Morgan chopper and controlled by powerful ARM processor. It results in accurate analysis of the blood samples.
The various techniques involved in accurate sensing of speed using timer and generation of firing pulses to thyristor
in the Morgan chopper is judiciously achieved. This paper clearly brings out the advantages of the proposed blood
measurement technique which effectively gives blood analysis faster and at a low cost.