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29,922 Article Results

Chaos Based Image Encryption using Expand-Shrink Concept

10.11591/ijict.v3i2.pp103-112
Naveenkumar S K , Panduranga H T , Kiran P
Image information security plays a vital role in computing and communication technologies. This paper describes a new concept of expand and shrink to enhance the strength of chaos based image encryption technique. This method consists of both permutations as well as substitution process for image scrambling and encryption. In permutation plain image is shuffled using chaos technique. Input image undergo two times chaos permutation in-between expand and shrink process leads to substitution. Permutation decreases the correlation between the pixel and substitution increases the entropy of encrypted image. Proposed encryption technique works for both gray-scale and color image. From the experiment highly scrambled image is obtained at the end of encryption process. Decryption process employs exactly reverse process of encryption which results in the reconstructed images.
Volume: 3
Issue: 2
Page: 103-112
Publish at: 2014-08-01

Continuous Real-time Monitoring of Patient’s Vital Signs Based on ZigBee Standard

10.11591/ijict.v3i2.pp73-79
Saso Koceski , Olivera Kotevska , Elena Vlahu-Gjorgievska , Vladimir Trajkovik
This paper gives an understanding of what possibilities Wireless Body Area Network (WBAN) have when using shortrange wireless communications protocols. There advantages are used to facilitate versatility in the movements of health care patients. The paper investigates the feasibility of using the ZigBee protocol, givean analysis of methods for collection of received data from multi sensor environment, and mechanisms for privacy and data protection by using encryption techniques. This characteristics are applied on previously developed collaborative healthcare system model (COHESY).COHESY is aimed at continuous real time remote patients’ health monitoring.
Volume: 3
Issue: 2
Page: 73-79
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

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

Proposing a Practical Method for Conceptual Design Process in New Product Development: Medical Glasses as a Case Study

10.11591/ijict.v3i2.pp80-87
Amir Mirzadeh Phirouzabadi
Nowadays,improving the quality of products, reducing cost and meeting customer’srequirements are necessary to shorten the time of new product development(NPD). NPD is used to describe the complete process of bringing a new product to market and conceptual design process(CDP) is at its early stage and has mostly changed from passive respond toaggressive one. Thus, this study proposed a practical method for CDP in NPDthrough three phases as Converting customers’ requirements to product specifications,Generating and selecting of concepts and Testing and finalizing the concepts byusing some different management-engineering techniques. Firstly, this papertried to prioritize customer’s requirements related to product by AHP (AnalyticHierarchy Process) and convert them to engineering parameters of TRIZ (Theoryof Inventive Problem Solving) in order to define the inventive principals.Next, based on QFD (Quality Function Deployment), we measured the weight valuesof inventive principals. Finally, as FMEA (Failure Mode and Effect Analysis)can analyze the weight values and reduce the sequential risk, then finalconceptual design was generated. At the end, a medical glasses was used as acase study of innovative design to validate the method and explain how thestrategies of this research for CDP.
Volume: 3
Issue: 2
Page: 80-87
Publish at: 2014-08-01

Performance Measurement in ITG Based on Balanced Scorecard

10.11591/ijict.v3i2.pp122-128
Haviluddin Haviluddin , Rayner Alfred
The article reports on our work in conducting performance measurement for the management of Information Technology (IT) by applying the Balanced Scorecard (BSC) at Mulawarman University, Samarinda, East Kalimantan, Indonesia. The results of this study are then used to propose a hybrid framework that applies both BSC and a artificial intelligence (AI) techniques in order to measure the performance of IT governance generally. This article also examines BSC’s abilities and its flexibility compared to other methods in measuring the performance of IT governance. The proposed hybrid framework is expected to yield a management that produces a scorecard measures that are more rigorous, accurate and consistent with the objectives and organizational strategies in non-profit organizations, especially educational ones.
Volume: 3
Issue: 2
Page: 122-128
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

Impact of FFT algorithm selection on switching activity and coefficient memory size

10.11591/ijeecs.v12.i8.pp6224-6229
Imran Ali Qureshi , Fahad Qureshi
The binary tree decomposition allows for obtaining a large number of algorithms that can be used to calculate the fast Fourier transform. This paper analyzes the differences among these algorithms in terms of switching activity, which is related to the power consumption of the circuit, and size of the coefficient memories, which is related to the area of the circuit.Experimental results show the most efficient algorithms in term of area and power consumption. Furthermore, the paper shows the importance of a proper algorithm selection, since efficient algorithms can lead to savings of upto 45% in terms of the coefficient memory and even greater than 50% in terms of switching activity with respect to other less efficient ones.
Volume: 12
Issue: 8
Page: 6224-6229
Publish at: 2014-08-01
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