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27,404 Article Results

Small-world and Scale-free Features in Harry Potter

10.11591/ijeecs.v12.i8.pp6411-6416
Zhang Jun , Zhao Hai , Xu Jiu-qiang , Wang Jin-fa
Harry Potter is a series of seven fantasy novels which has got a huge success. To explore the reasons of so successful of the novel behind, we analyzed the characters network in Harry Potter from the perspective of complex networks. Studies show that the characters network in Harry Potter has got the small-world effect and scale-free feature. It is a typical complex network. The success of novel Harry Potter is precisely due to the complex properties of it, and this may give some guidance for novel writers when preparing their works.
Volume: 12
Issue: 8
Page: 6411-6416
Publish at: 2014-08-01

Inteference Mitigation in Femtocellular Networks

10.11591/ijict.v3i2.pp113-121
Amevi Acakpovi , Dominique Kogue , Koudjo Mawuefam Koumadi , Ibrahim Tahirou
Femtocells can significantly boost up wireless cellular network capacity by reducing communication distances to user equipment and also by reusing resources already utilized in the macrocell network on which they overlay. However, the deployment of femtocells within a macrocell coverage area, causes severe interference between the femtocell and the macrocell, which may have an impact on the overall performance of the femtocells. Avoiding such interference is very important for the effective co-existence of femtocells and macrocell. This paper proposes an algorithm to mitigate cross-tier interference between a femtocell and a macrocell using adaptive power control. The proposed approach is modeled and simulated using MATLAB. The impact on the performance of the femtocell using the proposed algorithm is analysed. Results show that the proposed adaptive power control algorithm has tremendously reduced the negative effects on the system throughput, delay and outage probability for voice and data traffics.
Volume: 3
Issue: 2
Page: 113-121
Publish at: 2014-08-01

PLC SCADA Based Fault Identification and Protection for Three Phase Induction Motor

10.11591/ijeecs.v12.i8.pp5766-5773
Venkatesan Loganathan , S. Kanagavalli , P.R. Aarthi , K.S. Yamuna
Today overvoltage, over current, overload, over temperature, and under voltage are the most commonly occurred problems in protection circuits of induction motor. We usually design Protection circuits with components such as timers, contactors and current relays. In order to reduce the mechanical components usage we prefer to use Personal Computer (PC) and Programmable Logic Controller (PLC). In this method Induction motors current, voltage, Speed, temperature values and fault occurred history are monitored in PC with an Alarm Message during fault occurrence. PLC-based protection methods are costs less, provides higher accuracy with safe mode of operation when compared with the other protection systems.
Volume: 12
Issue: 8
Page: 5766-5773
Publish at: 2014-08-01

Image Protection by Intersecting Signatures

10.11591/ijeecs.v12.i8.pp6386-6392
Chun-Hung Chen , Yuan-Liang Tang , Wen-Shyong Hsieh , Min-Shiang Hwang
In this paper, we propose an exact image authentication scheme that can, in the best case, detect image tampering with the accuracy of one pixel. This method is based on constructing blocks in the image in such a manner that they intersect with one another in different directions. Such a technique is very useful to identify whether an individual image pixel has been tampered with.
Volume: 12
Issue: 8
Page: 6386-6392
Publish at: 2014-08-01

Embedded System Application for Blind People Navigation Tool

10.11591/ijeecs.v12.i8.pp6083-6087
Wakhyu Dwiono , Siska Novita Posma , Arif Gunawan
The stick for blindman navigational aid can only provide information about the presence of objects that being touched. This navigational aid stick can not provide more information such as object distance and the name of the place. To overcome this problem, we realized a navigational tool that can provide information about the distance of objects around the user and the name of the places where being passed. The existing objects are detected using three sets of ultra sonic sensors. These sensors emit ultrasonic signals, when the signal collide the obstacle, then will be reflected back and being received by these sensors too. The time lag between the transmitting and receiving signals then will be converted into the distance. RFID reader is used to read the presence or absence of tags around the RFID reader. Identity tag emits a signal that will be used to mark the place name. The results of measuring distance and sequence voice database recorder gives a good yield. Voice database recorder circuit works as well as the detection of RFID tags.
Volume: 12
Issue: 8
Page: 6083-6087
Publish at: 2014-08-01

A Complete Lattice Lossless Compression Storage Model

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/3756
Zhi Huilai
In this paper, a complete lattice lossless compression storage model is proposed to improve the storage efficiency. In order to build the proposed model, first all the upper and lower irreducible elements of the complete lattice are identified respectively, then an isomorphic mapping form the complete lattice to a concept lattice is founded, and finally a matrix is used to store the formal context of the concept lattice. Compared with using adjacent matrix, example and analysis show that the proposed method can improve the storage efficiency of complete lattice. DOI: http://dx.doi.org/10.11591/telkomnika.v12i8.5854 
Volume: 12
Issue: 8
Page: 6332-6337
Publish at: 2014-08-01

Automatic Monitoring of Pest Insects Traps Using Image Processing

10.11591/ijeecs.v12.i8.pp5779-5783
Akash J. Upadhyay , P. V. Ingole
Monitoring pest insect population is currently an important issue in crop protection. At farm level insect population monitoring is consistently operated by repeated surveys by a human operator of adhesive traps, disseminated through the field, where insects remain stuck when attracted. This is a laborious and time-consuming activity, and it would be of great advantage for farmers to have an affordable system performing this task automatically. A system based on a distributed imaging device that is able to automatically acquire and transmit images of the trapping area to a remote host station is proposed. The network architecture consists of a master node hosted in a PC and a set of client nodes, spread in the fields, which act as monitoring stations. The master node coordinates the network and retrieves the captured images from the client nodes. A GSM modem which is interfaced with PC through USB port is used to send messages to the particular numbers for required attention in this regard for further action.
Volume: 12
Issue: 8
Page: 5779-5783
Publish at: 2014-08-01

Harmonic Reduction in Variable Frequency Drives Using Active Power Filter

10.11591/ijeecs.v12.i8.pp5758-5765
M. Tamilvani , K. Nithya , M. Srinivasan
In this paper Voltage Source Inverter (VSI) is used to supply a variable frequency variable voltage to a three phase induction motor drive in a variable speed application. One important complication is that, Voltage Source Inverter (VSI) used in VFD causes non-sinusoidal output voltage and current due to presence of harmonics. Shunt active filter with VSI topology is proposed for current harmonic elimination. The current control scheme proposed for SAPF is Synchronous Reference Frame theory applied to SVPWM. The reference current can be calculated by using Reference Frame Transformation, reference current are transformed from a−b−c stationary frame to d−q rotating frame. In SVPWM technique, the Active Power Filter reference voltage is generated and desired Active Power Filter output voltage is generated by SVPWM. The analysis of simulation results are carried out in MATLAB/SIMULINK model.
Volume: 12
Issue: 8
Page: 5758-5765
Publish at: 2014-08-01

Design of Temperature Measurement and Data Acquisition System based on Virtual Instrument LabVIEW

10.11591/ijeecs.v12.i8.pp6027-6035
Xingju Wang
The LabVIEW virtual instrument consists of three parts: data acquisition, data test and analysis, output display. System control part is realized on the LabVIEW platform, data collection, data processing, and data recording, alarm and historical data readback function. The system uses DSl8B20 to measure temperature. The paper present design of temperature measurement and data acquisition system based on virtual instrument LabVIEW. Finally, this paper realizes the temperature acquisition and detection system, which is a new type of intelligent. System hardware circuit design is using digital temperature sensor DS18B20, and experiments show that the proposed method has a good effect.
Volume: 12
Issue: 8
Page: 6027-6035
Publish at: 2014-08-01

Modeling and Simulation of Silicon Solar Cell in MATLAB/SIMULINK for Optimization

10.11591/ijeecs.v12.i8.pp6047-6054
Ehsan Hosseini
One of the most significant current discussions in life is solar energy and has been in use since the beginning of time. Increasingly, man is learning how to yoke this important resource and use it to replace traditional energy sources. Recent developments in the field of solar energy have led to a renewed interest in Solar cells to store this energy and reproduce electricity. Unfortunately the amount of energy converted is very less, that is the efficiency of conversion is poor. The major problem is to improve the efficiency so that the losses can be minimized. In this project the Maximum Power Points are found and the Fill Factor is calculated. In this paper using MATLAB and SIMULINK model the comparison of silicon solar cell and type of panels is done.
Volume: 12
Issue: 8
Page: 6047-6054
Publish at: 2014-08-01

Peak Power Reduction Using Improved Selective Mapping Technique for OFDM

10.11591/ijeecs.v12.i8.pp6291-6296
Muhmmad Rizwan Anjum , Mussa A. Dida , M. A. Shaheen
OFDM has Major disadvantage is that  it leads to high Peak to Average Power Ratio (PAPR) which is consider to be as the main implementation drawback.  In this paper we are discussing about PAPR which affects the performance and efficiency of Power Amplifier (PA) and its influence by utilizing the Selective Mapping (SLM) technique in OFDM system for reduction of PAPR. the idea for improved SLM produces several independent signals based on converting the original data lock into many independent signal and then the signal has lowest PAPR that specific signal is  transmitted. Also data rate trade-off exist at the receiver end  when side information is detected for the  recovery of data block. which leads to the reduction of data rate. Improved SLM techniques for reducing the PAPR is the most promising reduction technique in its non-uniform phase factor for PAPR reduction in multicarrier OFDM system. Furthermore the estimate  expression by using Complementary Cumulative Distribution Function (CCDF) for PAPR has been discussed. Simulated results demonstrate that OFDMA signals using improved SLM technique carried significant effects in reduction of PAPR in OFDM system.
Volume: 12
Issue: 8
Page: 6291-6296
Publish at: 2014-08-01

Growing Neural Gas Based MPPT for Wind Generator Using DFIG

10.11591/ijeecs.v12.i8.pp5751-5757
J. Priyadarshini , J. Karthika
This paper presents Growing Neural Gas (GNG) based a maximum power point tracking (MPPT) technique for a high performance wind generator using DFIG. It is used in variable speed wind energy conversion system. Here, two back to back converters is used and connected to the stator, correspondingly FOC and VOC is done on machine and supply side converter. Constant voltage over the grid is obtained through dc link voltage. For Variable speed wind energy conversion system the maximum power point tracking (MPPT) is a very important requirement in order to maximize the efficiency. Here Neural Network has been trained to learn the turbine characteristic i.e torque versus wind speed and machine speed. It has been implemented to obtain maximum power point tracking for varying wind speed. And finally comparison has been made with and without growing neural gas.
Volume: 12
Issue: 8
Page: 5751-5757
Publish at: 2014-08-01

Handover Scenarios for Mobile WiMAX and Wireless LAN Heterogeneous Network

10.11591/ijeecs.v12.i8.pp6313-6323
NMAED Wirastuti , CCW Emehel
This paper presents proposed handover scenarios for a heterogeneous network comprising mobile worldwide interoperability for Microwave Access and Wireless Local Area Network segments. Homogenous handover scenarios for a mobile WiMAX network are also considered to allow a comparative analysis. A mobile node supporting voice traffic is analysed, when operating in a half-cell overlap coverage scenario, for both pedestrian and vehicular speeds. All proposed handover scenarios are assessed and validated through system-level Media Independent Handover network simulations. Results for both homogenous and heterogeneous handover show that the handover delay and jitter are within the acceptable values published by the WiMAX Forum. For heterogeneous handover, the packet loss is negligible for all cases; however, there were significant occurrences of packet loss in throughput for homogenous handover at vehicular speeds. This is due to the fact that the implementation of an adaptive channel scanning algorithm to allocate scanning intervals can limit communication disruptions.
Volume: 12
Issue: 8
Page: 6313-6323
Publish at: 2014-08-01

Hybrid PSOGSA Method of Solving ORPD Problem with Voltage Stability Constraint

10.11591/ijeecs.v12.i8.pp5807-5813
J. Jithendranath , A.Srihari Babu , G.Durga Sukumar
This paper presents a new hybrid evolutionary based algorithm based on PSO and GSA for solving optimal reactive power dispatch problem in power system. The problem was designed as a Multi-Objective case with loss minimization and voltage stability as objectives. Generator terminal voltages, tap setting of transformers and reactive power generation of capacitor banks were taken as optimization variables. Modal analysis method is adopted to assess the voltage stability of system. The above presented problem was solved on basis of efficient and reliable technique which takes the advantages of both PSO and GSA. The proposed method has been tested on IEEE 30 bus system where obtained results were found satisfactorily to a large extent that of reported earlier.
Volume: 12
Issue: 8
Page: 5807-5813
Publish at: 2014-08-01

Enhancement Fault Ride-Through Capability of DFIG By Using Resistive and Inductive SFCLs

10.11591/ijeecs.v12.i8.pp5946-5953
Ali Azizpour , Mehdi Hosseini , Mahmoud Samiei Moghaddam
The number of wind turbines connected to the grid is steadily increasing in recent years. This situation forced the revision of the electric utilities grid codes requirements, to remain connected during grid faults, i.e., to ride through the faults, especially for those with power electronic converters, such as DFIGs. In fault condition, the voltage at the Point of Common Coupling (PCC) drops immediately and The grid voltage dips imposed at the connection point of the DFIG to the grid induce large voltages in the rotor windings, resulting in high rotor current, which can damage the rotor-side converter and disconnect from grid.  In this paper, resistive and inductive superconducting fault current limiter (SFCL) is used to improve the fault ride- through (FRT) of wind turbine generation system (WTGS). The WTGS is considered as a variable-speed system, equipped with a DFIG. The analytical and simulation studies of the resistive SFCL for improving FRT capability are presented and compared with the inductive SFCL.
Volume: 12
Issue: 8
Page: 5946-5953
Publish at: 2014-08-01
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