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25,002 Article Results

Capacity Enhancement for High Data Rate Wireless Communication System

https://ijece.iaescore.com/index.php/IJECE/article/view/5547
Kehinde Odeyemi , Erastus Ogunti
Wireless communication systems have advanced significantly in the past years and played an extremely important role in our society. It is rapidly becoming the most popular solution to deliver voice and data services due to flexibility and mobility that can be offered at moderate infrastructure costs. It is foreseen that future wireless communication system will experience an enormous increase in traffic due to increased number of users as well as new high bit rate data services (multimedia) being introduced. The increase in channel capacity and high transmission rates for wireless communications requires technologies for power saving and efficient frequency usability. One of the most promising techniques to achieve this is the Multiple Input Multiple Output (MIMO) system. This paper proposed a combined spatial multiplexing MIMO scheme with beamforming for high data rate wireless communication. The proposed transmission scheme combines the benefits of both techniques and the system was able to transmit parallel data streams as well as provide beamforming gain. Actually, these diverse techniques, share the same requirement of multiple antenna elements, but differ in the antenna element spacing necessary for the different schemes to work. Thus, smart antenna array was proposed as a possible solution and was adopted at both the transmitter and receiver. The proposed hybrid technique improved the system spectral efficiency performance significantly than the conventional MIMO, spatial multiplexing and beamforming techniques when used alone under the same simulation environment.DOI:http://dx.doi.org/10.11591/ijece.v4i5.6450
Volume: 4
Issue: 5
Page: 800-809
Publish at: 2014-10-01

ANSYS Simulation Analysis of Stray Currents on Subway Shield Tunnel

10.11591/ijeecs.v12.i10.pp7099-7107
Guo Wang , Xiaoxiang Pei
In order to analyze the distribution rule and influence range of subway shield tunnel in different traction currents, a three-dimensional geometrical model and mathematical model of subway shield tunnel stray current field were built, and a finite element model was developed by Ansys. Simulating for homogeneous and stratified soil media were happened in the metro stray current field simulation, through different carry-currents of railway. Simulation show that the potential attenuation is nonlinear from the subway tunnel to the surrounding underground and along far away rail loading current of direction; The carry-current is different, the potential of surrounding media is different, and the greater the current, the greater the maximum potential. Each points stray current in situation of surrounding soil media subway tunnel shield can be analyzed by the three-dimensional finite element model, and provide the basis for the protection range of stray current and the protection at a specific location.
Volume: 12
Issue: 10
Page: 7099-7107
Publish at: 2014-10-01

The interaction of Alizarin Red with Tryptophan by Voltammetry

10.11591/ijeecs.v12.i10.pp7191-7195
Yu Zhuan-Ni , Wang Qiang
The interaction of Alizarin Red (AR) with Tryptophan (Trp) was investigated by first order derivative linear sweep voltammetry. In pH5.2 NaAc-HAc buffer solution, AR had a well-defined voltammetric reductive peak at -0.392V(vs.SCE).After Trp addition, the peak current of AR decreased apparently with no change of the peak potential and no appearance of new peaks. The study about the effect of scan rate on peak current showed that a new electro-inactive complex was formed as a result of interaction of AR with Trp, which decreased the peak current. Based on the formation of AR-Trp complex, the conditions of interaction and the electrochemical detection were carefully investigated and the binding ratio was obtained by mole ratio method. Finally the character of the electrode process was discussed by the effect of scan rates on AR-Trp interaction system.
Volume: 12
Issue: 10
Page: 7191-7195
Publish at: 2014-10-01

Medical Image Compression using Lifting based New Wavelet Transforms

https://ijece.iaescore.com/index.php/IJECE/article/view/5530
Arikatla Hazarathaiah , B Prabhakara Rao
In this paper, the construction of new lifting based wavelets by a new method of calculating lifting coefficients is presented. First of all, new basis functions are utilized to ease new orthogonal traditional wavelets. Then by using the decomposing poly-phase matrix the lifting steps are calculated using a simplified method. The interesting feature of lifting scheme is that the construction of wavelet is derived in spatial domain only; hence the difficulty in the design of traditional wavelets is avoided. Lifting scheme was used to generate second generation wavelets which are not necessarily translation and dilation of one particular function. Short and sharp basis functions are chosen so as to obtain the non-uniform nature of usual image classes. Implemented wavelets are applied on a number of medical images. It was found that the compression ratio (CR) and Peak Signal to Noise Ratio (PSNR) are far ahead of that are obtained with the popular traditional wavelets as well as the successful 5/3 and 9/7 lifting based wavelets. Set Partitioning in Hierarchical Trees (SPIHT) is used to incorporate compression.DOI:http://dx.doi.org/10.11591/ijece.v4i5.5969
Volume: 4
Issue: 5
Page: 741-750
Publish at: 2014-10-01

Combine Multi-predictor ofGas Concentration Prediction Based on Wavelet Transforms

10.11591/ijeecs.v12.i10.pp7361-7368
Wu Xiang , Qian Jian-Sheng
A method of combine multi-predictoris proposed based on wavelet transform to improve the prediction precision of coal mine gas concentration time series. Firstly, the proposed model employ Mallat algorithm to decompose and reconstruct the gas concentration time series to isolate the low-frequency and high-frequency information. Then, ARMA model is built forthe prediction of high-frequency information and rectifies deviations of the predicted values by Markov bias correction method while the SVM model is used to fitthe prediction of the low-frequency information. At last, these predicted values are superimposedto obtain the predicted values of the original sequence. This method makes an effective separation of the feature information of gas concentration time series and takes full advantage of the features of different prediction models to achieve complementary advantages. The comparison experiment with the single-predictor models(BP, SVM) and single-predictor models based on wavelet decomposition(W-BP, W-SVM)show that the proposed method improves the overall predictionprecision.The results show that method has high precision and strong practicability.
Volume: 12
Issue: 10
Page: 7361-7368
Publish at: 2014-10-01

Adjusting ICT Capacity Planning by Minimizing Cyber Crime Effects in Urban Area: A System Dynamics Approach

https://ijece.iaescore.com/index.php/IJECE/article/view/5557
Feldiansyah Bin Bakri Nasution , Nor Erne Nazira Bazin
In doing the ICT capacity planning, most organizations or institutions ignore unconsciously other conditions except statistical data of bandwidth or utilization of ICT products. On this occasion, the ICT capacity planning is analyzed by using system dynamics with considering some factors or components which are combinations between technical and non technical things such as: business, education, ICT infrastructure, ICT usage and cyber crime. Simulation of interrelationship between the components is conducted to understand the behavior of the system. System dynamics gives us an input about correction of the statistical data by minimizing cyber crime effects. In this paper, it is also introduced the system breakdown structure (SBS), a technique to breakdown a big and complex system into smaller and manageable components. The objective of this SBS is to make system dynamics more expandable in hierarchy way in analyzing a system.DOI:http://dx.doi.org/10.11591/ijece.v4i5.6854
Volume: 4
Issue: 5
Page: 668-678
Publish at: 2014-10-01

Path Planning for Coalmine Rescue Robot Based on Hybrid Adaptive Artificial Fish Swarm Algorithm

10.11591/ijeecs.v12.i10.pp7223-7232
Yao Zheng-Hua , Ren Zi-Hui , Zhu Xian-Hua , Li Shi-Chun
For the problem with imprecise optimal solution and reduced convergence efficiency of basic artificial fish swarm algorithm (BAFSA) in the late, the adaptive enhanced prey behavior of artificial fish and the segmented adaptive strategy of artificial fish’s view and step were designed. The hybrid adaptive artificial fish swarm algorithm (HAAFSA) was structured by the adaptive enhanced prey behavior and the segmented adaptive strategy of artificial fish’s view and step, which has been verified on research. According to the characteristics of the coalmine rescue environment, the path planning environment model was established in two-dimensional plane and the optimization constraints conditions were disposed by detecting the distance between path sections and barriers. The HAAFSA was applied to coalmine rescue robot path planning. Simulation results showed that the HAAFSA could improve the performance of the optimal path.
Volume: 12
Issue: 10
Page: 7223-7232
Publish at: 2014-10-01

An Adaptive Neuro-Fuzzy Inference Distributed Power Flow Controller (DPFC) In Multi-Machine Power Systems

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/5057
Gurrala Madhusudhan Rao , V Anwesha Kuma , B.V. Sanker Ram
The main theme of the paper which deals with the enhancing steady-state and dynamics performance of the power grids by Flexible AC Transmission System (FACTS) based on computational intelligence. The proposed technique will be applied to solve real problems in a power grid. The FACTS device, which will be used in the paper, is the most promising one, which known as the Distributed Power Flow Controller (DPFC). The paper achieves the optimization of the type, the location and the size of the power and control elements for DPFC to optimize the system performance. The paper derives the criteria to install the DPFC in an optimal location with optimal parameters and then designs an AI based damping controller for enhancing power system dynamic performance. In this paper, for every operating point genetic algorithm is used to search for controllers’ parameters, parameters found at certain operating point are different from those found at others. ANFISs are required in this case to recognize the appropriate parameters for each operating point.DOI: http://dx.doi.org/10.11591/ijpeds.v5i2.6311
Volume: 5
Issue: 2
Page: 230-236
Publish at: 2014-10-01

Estimation of Harmonics in Three-Phase and Six-Phase Load Circuits

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/5048
Deepak Kumar , Zakir Husain
The Harmonics are very harmful within an electrical system and can have serious consequences such as reducing the life of apparatus, stress on cable and equipment etc. This paper cites extensive analytical study of harmonic characteristics of multiphase (six- phase) and three-phase system equipped with two & three level inverters for non-linear loads.  Multilevel inverter has elevated voltage capability with voltage limited devices; low harmonic distortion; abridged switching losses. Multiphase technology also pays a promising role in harmonic reduction. Matlab simulation is carried out to compare the advantage of multi-phase over three phase systems equipped with two or three level inverters for non-linear load harmonic reduction.The extensive simulation results are presented based on case studies.DOI: http://dx.doi.org/10.11591/ijpeds.v5i2.5166
Volume: 5
Issue: 2
Page: 142-152
Publish at: 2014-10-01

Decision Support Dashboard in OpenERP

10.11591/ijeecs.v12.i12.pp8326-8334
Laila Eken , Belaid Bouikhalene , Mohamed Fakir
This work focuses on the analysis and design of decision support dashboard in OpenERP. With the aim to improve the Operational Information System OIS of the Moroccan university, Hassan 1st University of SETTAT launched MISSION project, in association with 22 academic and institutional partners of Morocco and the European Union. This project is to improve the management of Moroccan universities. The vision of the MISSION project is to modernize the governance of universities in order to improve the quality of services offered by the university administration. The basic idea is to provide each partner university in a OIS using open source ERP (OpenERP) and integrating 4 bricks trades (schooling, Finance, Human Resource Management (HRM) and Heritage). This operational information system is not completed if and only if there is a Strategic Information System (SIS) that uses the information provided by the first to give university leaders the opportunity to take long-term decisions and this is the aim of the second. One of the tools of SIS we find dashboards.
Volume: 12
Issue: 12
Page: 8326-8334
Publish at: 2014-09-21

Study on Temperature Rise of Dry-Type Transformer in Different Cooling Conditions with FEM

10.11591/ijeecs.v12.i11.pp7578-7584
Chao Liu
To study the temperature rise of dry-type transformer in different cooling conditions, finite element method is used in this paper to calculate temperature distribution in the transformer. Firstly, thermal-fluid coupled model of a transfomer is built up，and the equivalent heat generation of this model is figured out according to the results of delivery test. Then, thermal-fluid coupled model is simulated in both natural cooling condition and forced cooling condition, and temperature distributions in the iron and windings under these two conditions are obtained. Finally, temperature rises in these two conditions are compared to figure out the influence of cooling condition on transformer temperature rise.    
Volume: 12
Issue: 11
Page: 7578-7584
Publish at: 2014-09-14

Closed Loop Analysis of Multilevel Inverter fed Drives

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/5007
Bharath VS , Gopinath Mani
This paper deals with the simulation and implementation of multilevel inverter for drives application. Here the focuses will be on improving the efficiency of the multilevel inverter and quality of output voltage waveform. The circuit is developed towards high efficiency, high performance, and low cost, simple control scheme. Harmonics Elimination were implemented to reduce the Total Harmonics Distortion (THD) value which is achieved by selecting appropriate switching angles. In this paper to determine the performance of rectifier, steady state analysis is done.  Furthermore, the merits of multilevel inverter topology are inherited.Closed loop control is done to analysis the stability of the system.DOI: http://dx.doi.org/10.11591/ijpeds.v4i3.5937
Volume: 4
Issue: 3
Page: 337-342
Publish at: 2014-09-01

A Bisection Method for Information System Knowledge Reduction

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/3827
Zhi Huilai
In rough set theory, attribute reduction aims to retain the discernability of the original attribute set, and many attribute reduction algorithms have been proposed in literatures. However, these methods are computationally time-consuming for large scale datasets. We develop a bisection method for attribute reduction and the main opinion is to partition the universe into smaller ones by using partition core attributes to reduce the complexity. Experiments and analysis show that, compared with the traditional un-bisection reduction algorithm, the developed bisection algorithm can significantly reduce computational time while maintaining their results as same as before. http://dx.doi.org/10.11591/telkomnika.v12i9.4913 
Volume: 12
Issue: 9
Page: 6903-6908
Publish at: 2014-09-01

Bee Inspired Zonal Vehicle Routing Algorithm in Urban Traffic

10.11591/ijeecs.v12.i9.pp6699-6710
Lei Wu , Licai Yang , Haiqing Liu , Yao Zhang
Abstract Dynamic Route Guidance System, which can provide the drivers with the optimal routes, is one of the most efficient solutions to the traffic jam. This paper presents a bee inspired zonal vehicle routing algorithm to provide a reasonable and effective optimal route for the Dynamic Route Guidance System. Firstly, the proposed algorithm divided the whole traffic network into different traffic guidance zone based on Shapley value game. Then, real time traffic data was collected in each traffic guidance zone by inter-vehicle and vehicle-to-infrastructure communications. Ultimately, the proposal simulated the bee foraging phenomenon in the biological system to synchronously compute the optimal routes in each traffic guidance zone. The simulation results show that the algorithm
Volume: 12
Issue: 9
Page: 6699-6710
Publish at: 2014-09-01

Simulation Analysis of Ac/Dc Adapter Under Zero No-Load Power Consumption using Simulink Process

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/5006
Dona Maria Mathew , K. Vinoth Kumar , Nithin.T. Abraham , Vicky Jose
The burst-mode control is generally used to regulate the output voltage of the ac/dc adapter under light or no-load condition. Although the burst-mode control reduces the switching loss, the control-IC and the feedback circuit at the output side still consume a large amount of power. In order to further reduce the power consumption at no-load condition, a zero no-load power (ZNP) ac/dc adapter for electronic equipment with an embedded battery is proposed in this paper. When the proposed adapter is load connected, the operation is same as that of the conventional adapter. At no-load condition, the adapter is totally turned off. As a result the adapter can reduce the no-load power consumption to less than 1mW. Simulation of a 65 W adapter is presented in order to verify its validity.DOI: http://dx.doi.org/10.11591/ijpeds.v4i3.5669
Volume: 4
Issue: 3
Page: 329-336
Publish at: 2014-09-01
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