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27,404 Article Results

Test Case Reduction Using Ant Colony Optimization for Object Oriented Program

10.11591/ijece.v5i6.pp1424-1432
Sudhir Kumar Mohapatra , Srinivas Prasad
Software testing is one in all the vital stages of system development. In software development, developers continually depend upon testing to reveal bugs. Within the maintenance stage test suite size grow due to integration of new functionalities. Addition of latest technique force to make new test case which increase the cost of test suite. In regression testing new test case could also be added to the test suite throughout the entire testing process. These additions of test cases produce risk of presence of redundant test cases. Because of limitation of time and resource, reduction techniques should be accustomed determine and take away. Analysis shows that a set of the test case in a suit should satisfy all the test objectives that is named as representative set. Redundant test case increase the execution price of the test suite, in spite of NP-completeness of the problem there are few sensible reduction techniques are available. During this paper the previous GA primarily based technique proposed is improved to search out cost optimum representative set using ant colony optimization.
Volume: 5
Issue: 6
Page: 1424-1432
Publish at: 2015-12-01

Voltage and Frequency Control of Variable Speed Induction Generator using One Cycle Control Technique

10.11591/ijpeds.v6.i4.pp723-729
T. Elango , A.Senthil Kumar
Induction generators are widely used to extract the energy from renewable sources, particularly as a wind power generator either grid connected or isolated operation. The problem associated with stand-alone mode operation is voltage and frequency control. An electronic load controller is used for frequency / voltage control. It uses PI controller to generate the gating signal for the DC chopper. This method has the fault of bad dynamic response and thedistortion of output voltage at zero-crossing. To overcome the defect of PI controller when steady state error is equal to zero, a one cycle control technique suggested and implemented. Simulation of wind driven self-excited induction generator (SEIG) performance is studied and results are discussed.
Volume: 6
Issue: 4
Page: 723-729
Publish at: 2015-12-01

Numerical and Experimental Investigation of Bridge Currents of an Induction Machine Equipped with Bridge Configured Winding

10.11591/ijece.v5i6.pp1262-1274
Sivaramakrishnan Natesan , Karuna Kalita , Venkatesu Samala
An eccentric rotor motion imbalances the magnetic field distribution in the air-gap region. Due to this uneven flux density distribution, a net radial force called Unbalanced Magnetic Pull (UMP) is in action towards the shortest air-gap. This UMP can degrade the machine’s performance. UMP can be controlled by a special kind of winding called Bridge Configured Winding (BCW). The BCW winding is a single set of winding which is used to produce the torque as well as the controllable force. The main contribution of this paper is to inspect the flow of bridge currents in the bridges when the machine is having rotor eccentricity or unbalance. The bridge currents in the presence of rotor eccentricity with the stator of an In­duction machine model has been analyzed by using an Electromagnetic Finite Element (FE) solver called Opera 2D/RM solver (Rotation Motion Analysis). The bridge currents have been measured for two different cases., (i) Induction machine model with zero eccentricity, (ii) Induction machine model with 10% static eccentricity of the air gap. Experimental re­sults are presented for the validation of Opera 2D/RM results. A modified 37kW Induction machine has been used for this study. A known mass unbalance is introduced in the perfo­rated disc in order to create the unbalance in the system purposefully. The bridge currents have been measured and compared with and without unbalance present in the system. The comparison of measured bridge currents for all the cases are given in the frequency domain.
Volume: 5
Issue: 6
Page: 1262-1274
Publish at: 2015-12-01

Optimized PID Controller with Bacterial Foraging Algorithm

10.11591/ijece.v5i6.pp1372-1380
Seiyed Mohammad Mirzaei , Mohammad Hossein Moattar
Fish robot precision depends on a variety of factors including the precision of motion sensors, mobility of links, elasticity of fish robot actuators system, and the precision of controllers. Among these factors, precision and efficiency of controllers play a key role in fish robot precision.  In the present paper, a robot fish has been designed with dynamics and swimming mechanism of a real fish. According to equations of motion, this fish robot is designed with 3 hinged links. Subsequently, its control system was defined based on the same equations. In this paper, an approach is suggested to control fish robot trajectory using optimized PID controller through Bacterial Foraging algorithm, so as to adjust the gains. Then, this controller is compared to the powerful Fuzzy controller and optimized PID controller through PSO algorithm when applying step and sine inputs. The research findings revealed that optimized PID controller through Bacterial Foraging Algorithm had better performance than other approaches in terms of decreasing of the settling time, reduction of the maximum overshoot and desired steady state error in response to step input. Efficiency of the suggested method has been analyzed by MATLAB software.
Volume: 5
Issue: 6
Page: 1372-1380
Publish at: 2015-12-01

Backstepping Control for a Five-Phase Permanent Magnet Synchronous Motor Drive

10.11591/ijpeds.v6.i4.pp842-852
Anissa Hosseynia , Ramzi Trabelsi , Atif Iqbal , Med Faouzi Mimounia
This paper deals with the synthesis of a speed control strategy for a five-phase permanent magnet synchronous motor (PMSM) drive based on backstepping controller. The proposed control strategy considers the nonlinearities of the system in the control law. The stability of the backstepping control strategy is proved by the Lyapunov theory. Simulated results are provided to verify the feasibility of the backstepping control strategy.
Volume: 6
Issue: 4
Page: 842-852
Publish at: 2015-12-01

The Transient Stability Study of a Synchronous Generator Based on the Rotor Angle Stability

10.11591/ijece.v5i6.pp1319-1327
Selwa Fetissi , Djamel Labed , Imen Labed
Transient stability is an important aspect in the operation of electrical power system. In case of fault occurs in the system, the determining of fault clearing time of circuit breaker is considered one of the main factors to ensure power transfer of the system. This paper is aim to study the transient stability of single machine infinite bus system (SMIB), based on the rotor angle stability. The study is performed to determine the influence of the critical clearing time of the circuit breakers on the rotor angle stability of the generator in the case of three phase fault. For obtaining and determining numerically the nature of the rotor angle of machine, we applied the Step-by-step method for different values of fault clearing time. The results of simulation indicate that determine of critical clearing time is a major evaluation in stability studies. The system model is created in MATLAB/ SIMULINK software.
Volume: 5
Issue: 6
Page: 1319-1327
Publish at: 2015-12-01

Password Authentication for multicast host using zero knowledge Proof

10.11591/ijece.v5i6.pp1468-1471
Seetha Ranganathan , R. Saravanan
The password which is a more secure and valuable data should be highly protected from eavesdropper. This paper presents how password required for authentication of members of group communication is securely delivered by the source or initiator of the group. The password delivery uses zero knowledge proof and sent to the group member in an encrypted format using cipher block mode encryption. The password delivered is a One Time Password which can be used for certain amount of time in order to ensure a highly secure communication environment among the group.
Volume: 5
Issue: 6
Page: 1468-1471
Publish at: 2015-12-01

Optimized Operation-Planning of a Microgrid with Renewable Sources and Vehicle to Grid

10.11591/ijeecs.v16.i3.pp401-408
Asad Waqar , Shaorong Wang , Qasim Kamil Mohsin , Muhammad Zahid
The microgrid with renewable sources possess stability issues. During the grid-connected mode, these issues are taken care by the external grid. However in case of islanding, the distributed generators within the microgrid, have to take care of these issues independently. It needs additional backup like diesel generation or battery storage, which increases the overall capital and operation costs. With the intervention of the V2G storage, these costs can be saved to some extent. However similar to the renewable sources like wind and solar, the power from V2G is also fluctuating which may lead the microgrid towards an uneconomical operation. Therefore an extensive operation-planning is needed to deal with these uncertainties, for the microgrid to be economically viable. In this context, the stochastic programming has been applied to achieve the optimum results. The stochastic scenarios for wind speed, solar radiation, V2G power and load fluctuation have been generated using the Markov chain Monte Carlo method. The optimized operation-planning aims to minimize the total net present cost, size of the fixed storage and fossil fuel emissions subject to constraints. The simulations have been performed using Matlab/Simulink, HOMER and Excel. The simulation results show that the V2G technology substantially decrease the total net present cost. Moreover for such a microgrid the total net present cost and fossil fuel emissions conflict with each other.
Volume: 16
Issue: 3
Page: 401-408
Publish at: 2015-12-01

Utlization Cat Swarm Optimization Algorithm for Selected Harmonic Elemination in Current Source Inverter

10.11591/ijpeds.v6.i4.pp888-896
Hamed Hosseinnia , Murteza Farsadi
The voltage source inverter (VSI) and Current source inverter (CSI) are two types of traditional power inverter topologies.In this paper selective harmonic elimination (SHE) Algorithm was impelemented to CSI and results has been investigated. Cat swarm (CSO) optimization is a new meta-heuristic algorithm which has been used in order to tuning switching parameters in optimized value.Objective fuction is reduction of total harmonic distortion(THD) in inverters output currents.All of simulation has been carried out in Matlab/Software.
Volume: 6
Issue: 4
Page: 888-896
Publish at: 2015-12-01

Analysis of Impedance Source Inverter Topologies for Grid integration of PV inverters

10.11591/ijpeds.v6.i4.pp797-807
Arasakumar Sangari , R Umamaheswari
In this paper, the performance of different Impedance Source Inverter (ZSI) topologies in implementing single stage power conversion for grid ingetertion of PV power converters  is discussed.Unlike the traditional inverters, ZSI employs a distinctive impedance network, thereby making shoot-through state is possible. The independent control variables are shoot-through duty ratio and modulation index. Simple Boost Control pulse width modulation technique was used in this work to vary the modulation index. Here the basic operation, simple boost control method, characteristics, requirements and harmonic analysis of the classical Z-Source Inverter (ZSI), TZ-Source Inverter (TZSI), Trans-Z-Source Inverter (Trans-ZSI) and Improved ZSI (IMZSI) topologies were compared for interfacing the wide range  variable input energy to utility supply system. The performances were compared based on its MATLAB/SIMULINK simulation model and featured results are shown to confirm its validity.
Volume: 6
Issue: 4
Page: 797-807
Publish at: 2015-12-01

Partial Shading in Building Integrated PV System: Causes, Effects and Mitigating Techniques

10.11591/ijpeds.v6.i4.pp712-722
Zainal Salam , Zulkifli Ramli , Jubaer Ahmed , Muhammad Amjad
This paper is aimed to provide a holistic understanding on the issues related to partial shading: its causes, the theoretical and physical reasons behind it, its implications on the BIPV system. Furthermore  the possible mitigation techniques using the software (MPPT) and hardware solutions are discussed. Finally an example is given to illustrate the impact of partial shading and the economic benefits of employing various partial shading mitigation techniques into the BIPV system To aid the unfamiliar readers in this subject, a brief but comprehensive overview of important PV concepts are also given.
Volume: 6
Issue: 4
Page: 712-722
Publish at: 2015-12-01

Cost Analysis of Hybrid Restructuration for Distribution System to Improve Voltage and Minimize Losses

10.11591/ijeecs.v16.i3.pp431-438
Firas M.F Flaih , Lin Xiangning , Samir M. Dawoud , Mohammed R. Almallah
Current situation in Iraq had led to extensive blackouts which needs an expansion in generation capacity. On the other hand the government has reduced the budget allocated for energy resource development and it seems this situation will sustain for the coming years.  So the fulfilment of the load demand is the biggest challenge for the ministry of electricity with limited budget. In this paper the authors have proposed a method to reduce the power losses and therefore improve the voltage profile for low voltage (LV) distribution system that results in reduction of blackouts. The method involves the repositioning of the distribution transformer (DTR) from the existing location and the replacement of the overhead conductor cross section area for an existing low voltage distribution system (LVDS). This method has been applied to a 20-node low voltage radial distribution network in the general directorate of north distribution electricity (GDNDE), Iraq, where voltage profile and losses are unsatisfactory. Results demonstrate the effectiveness of the proposed method also in terms of the economic feasibility. It is observed that the system average voltage profile is improved by 15%, tail end voltage enhanced by 19.7% and losses are reduced by 78% for existing the LVDS.
Volume: 16
Issue: 3
Page: 431-438
Publish at: 2015-12-01

Dynamic Mood Detection in Chat Application Using Text Pattern Analysis

10.11591/ijaas.v4.i4.pp124-129
Dheepthi M , M. Hemalatha
In modern communication and social networking the peoples of different ages are of different moods while chatting. This paper deals with detecting the modes and identifying human emotions through text mining. This paper explored to detect the mood variation of different age group that swings is maximum as compared to other age group. The moods can be classified in the basis of gender, age group and the emotion while texting. The random sample is taken from public chat in that the users are manually classified for strength of positive and negative emotions. By classifying emotions and using decision tree different variations are analyzed in this paper. Outlier study is used to recognize emotion distinction in child having any kind of disability. The pattern of the text is analysed and clustered and with the help of Besiyan classifier the text is classified in accordance with their emotions.
Volume: 4
Issue: 4
Page: 124-129
Publish at: 2015-12-01

Speech Recognition Using MFCC and VQLBG

10.11591/ijaas.v4.i4.pp151-156
M. Suman , K. Harish , K. Manoj Kumar , S. Samrajyam
Speaker  Recognition  is  the  computing  task  of confirmatory a user’s claimed  identity mistreatment characteristics extracted  from  their  voices.  This  technique  is  one  of  the  most helpful  and in style  biometric  recognition  techniques  in  the  world particularly connected  to  areas  in that security could be a major concern. It are often used for authentication, police work, rhetorical speaker recognition and variety of connected activities. The method of Speaker recognition consists of two modules particularly feature extraction and have matching. Feature extraction is that the method during which we have a tendency to extract a tiny low quantity of knowledge from  the  voice  signal  that will  later  be  used  to  represent every  speaker.    Feature  matching involves  identification  of  the  unknown  speaker  by scrutiny  the  extracted options  from his/her voice input with those from a collection of identified speakers. Our projected  work  consists  of  truncating  a  recorded  voice  signal,  framing  it,  passing  it through  a  window perform, conniving  the  Short  Term  FFT,  extracting  its options  and Matching it with a hold on guide.  Cepstral constant  Calculation  and  Mel  frequency Cepstral  Coefficients  (MFCC) area unit  applied  for  feature  extraction  purpose.VQLBG (Vector Quantization via Linde-Buzo-Gray) algorithmic rule is used for generating guide and feature matching purpose.
Volume: 4
Issue: 4
Page: 151-156
Publish at: 2015-12-01

Novel Method of FOC to Speed Control in Three-Phase IM under Normal and Faulty Conditions

10.11591/ijpeds.v6.i4.pp831-841
Mohammad Jannati , Tole Sutikno , Nik Rumzi Nik Idris , Mohd Junaidi Abdul Aziz
This paper proposes a novel method for speed control of three-phase Induction Motor (IM) which can be used for both healthy three-phase IM and three-phase IM under open-phase fault. The proposed fault-tolerant control system is derived from conventional Field-Oriented Control (FOC) algorithm with minor changes on it. The presented drive system is based on using an appropriate transformation matrix for the stator current variables. The presented method in this paper can be also used for speed control of single-phase IMs with two windings. The feasibility of the proposed strategy is verified by simulation results.
Volume: 6
Issue: 4
Page: 831-841
Publish at: 2015-12-01
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