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27,404 Article Results

A Thermally Non-equlibirium Approch for CFD Simulation of a Pulse Tube Refrigerator

10.11591/ijaas.v3.i2.pp65-69
Sachindra Kumar Rout
This paper deals with a new type of numerical computational fluid dynamic (CFD) approach of making more realistic to the porous media inside the regenerator of a pulse tube refrigerator. The available commercial software package FLUENT for solving Computational fluid dynamics (CFD) has capable of define a porous media and solve the governing equation for this region. But one problem arises is that inside the porous media region the software  consider the fluid medium temperature and solid matrix medium temperature remains same in any spatial location which is impractical in real case. So to avoid this impractical situation we made attempt to make a non-thermally equilibrium medium inside the regenerator by putting a solid inside the regenerator, a size equal with solid matrix and added the source  term to the fluid and solid of the regenerator by user define functions (UDF). In this analysis we used inertance tube pulse tube refrigerator (ITPTR) and helium is the working fluid.
Volume: 3
Issue: 2
Page: 65-69
Publish at: 2014-06-01

Design and Simulation of Multiple Coil Model for Wireless Power Transmission System

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/3486
Duan Zhao , Enjied Ding , Yanjun Hu , Zhifeng Sun
In Wireless Power Transfer (WPT) systems the proportion of energy received by the load is critical and the efficiency is the more significant parameter. WPT systems use resonant inductive coupling, where it is the near field wireless transmission of electrical energy between two coils that are highly resonant at the same frequency. This paper aims to propose a design of an optimal two dimensional (2D) structure of transmitter and receiver. Multiple overlapping coils structures in the transmitter side are proposed, in order to achieve higher efficiency than the typical single coil transmitter. Simulation results showed that the axial component of magnetic induction resulted from the overlapping coils structure has preferable homogeneous distribution. The proposed system achieved an efficiency value of 90 % for a receiver placed 20 cm away from a 4 coils transmitter comparing to an efficiency value of 75% for the same distance using a single coil transmitter. DOI : http://dx.doi.org/10.11591/telkomnika.v12i6.5119
Volume: 12
Issue: 6
Page: 4166-4177
Publish at: 2014-06-01

Research of the Defect Model Based on Similarity and Association Rule

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/3557
Wanjiang Han , Lixin Jiang , Xiaoyan Zhang , Tianbo Lu , Sun Yi , Li Yan , Weijian Li
In order to detect defects efficiently and improve the quality of products, this paper puts forward the concept about defect classification model and defect association model by a lot of defect data. The technology of similarity is applied to defect classification model, and the idea of Knowledge Discovery in Database is applied to defect association model. Defect classification model can analyze the defect efficiently and provides the basis of solving problems quickly while defect association model can be used to detect early and prevent problem, which can make effective improvements to testing and development. This paper summed up GUI defect model based on a large number of interface defects. The model is useful to improve the accuracy of forecast and be used for test planning and implementation through the practice of several projects. DOI : http://dx.doi.org/10.11591/telkomnika.v12i6.5452
Volume: 12
Issue: 6
Page: 4685-4691
Publish at: 2014-06-01

Mechanical and Physical Properties of Recycled Carton Sheets treated with Copolymer Latex BuA/MMA and BuA/St through Two Techniques

10.11591/ijaas.v3.i2.pp87-94
Amal H Abdel-kader
The aim of this work is to get rid of agricultural, paper wastes which consider a big environmental problem and their utilization in the production of economic products of some special applications. The use of paper-pulp packaging has become more attractive than traditional materials.  In our work the mechanical and physical properties of recycled carton treated with copolymer latex butyl acrylate – methylmethacrylate emulsified copolymer (BuA/MMA) were measured through two techniques. Dipping recycled carton in different concentrations of emulsified BuA - MMA (2-4 %) copolymer and using different concentration of BuA - MMA emulsified copolymer (1-10 %) added during sheets making.  From the results, a slight increase in the breaking length, cobb by treated sheets with different concentrations of the copolymer. But the burst and tear factors were decreased through the dipping effect. The breaking length of sheets increased at 1% copolymer, and then deceased by increasing the copolymer concentration. Whereas tear, burst factors and cobb increased through the addition of copolymer during paper making. Thermal gravimetric analysis (TGA) of samples was measured. The Microstructure of untreated and treated recycled carton sheets were clarified using SEM.  
Volume: 3
Issue: 2
Page: 87-94
Publish at: 2014-06-01

To study the Erosion Behavior of H.V.O.F. Coating of 16Cr5Ni at the Different Velocity of Slurry

10.11591/ijaas.v3.i2.pp57-64
Umakant Yadav , Naresh Kumar , Mukesh Kumar Rathi
This paper describes erosion characteristics of high velocity oxy fuel (H.V.O.F.) along with commonly used steels 16Cr5Ni in Turbine and studied the comparison the effect of erosion at Different Velocities of the slurry on Cr2O3 and CrC-NiCr coating on steel. The four different ranges of velocity is taken i.e. 35m/s, 50m/s ,60and 70m/s. at normal impact angle and comparison regarding the erosion resistance was determined from the mass loss results. Higher erosion takes place at medium range of velocity i.e. at 50 m/s. Based on this experimental study coating was considered acceptable for the processes employed
Volume: 3
Issue: 2
Page: 57-64
Publish at: 2014-06-01

A Key Agreement Protocol Based on Superior Fractal Sets

10.11591/ijaas.v3.i2.pp82-86
Shafali Agarwal , Ashish Negi
The fractal properties endeavour of inventing new techniques because of its complex structure. Mandelbrot and Julia sets are created by using the same function but in different parameter plane. This strong connection of fractals leads its use in the field of cryptography. In the proposed protocol, superior Mandelbrot set function is used to calculate the public keys with the help of chosen private keys as input parameter whereas superior Julia set function is used to generate a shared private key by using public keys of either side for both parties which is impossible to hack by an intruder.
Volume: 3
Issue: 2
Page: 82-86
Publish at: 2014-06-01

Simulation Investigation of SPWM, THIPWM and SVPWM Techniques for Three Phase Voltage Source Inverter

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/4994
Zulkifilie Bin Ibrahim , Md. Liton Hossain , Ismadi Bin Bugis , Nik Munaji Nik Mahadi , Ahmad Shukri Abu Hasim
Pulse width modulation (PWM) technique is one of the vital issues for power electronic circuit control. A number of Pulse width modulation (PWM) techniques are increasingly applied in many new industrial applications that require superior performance. The most widely applied PWM technique for three-phase voltage source inverters are Sine Pulse Width Modulation (SPWM), Third Harmonic Injection Pulse Width Modulation (THIPWM) and Space Vector Pulse Width Modulation (SVPWM). SPWM is the most simple modulation technique that can realize easily in analog circuit. However, it has some drawbacks such as higher total harmonic distortion (THD), lower switching frequency and not capable in over modulation region. THIPWM and SVPWM both provide better THD compared to SPWM. SVPWM shows lower THD in over modulation region and in high frequency application compared to THIPWM. These three techniques are discussed, analyzed and compared in terms of modulation index, switching frequency and inverter input voltage in this paper. The modeling and simulation for all PWM techniques have been done by using MATLAB/SIMULINK and Origin 6.1. From the simulation results, SVPWM shows the best performance and meet IEEE 519 standard of current harmonics level.DOI: http://dx.doi.org/10.11591/ijpeds.v4i2.5833
Volume: 4
Issue: 2
Page: 223-240
Publish at: 2014-06-01

An SLAM Algorithm Based on Square-root Cubature Particle Filter

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/3493
Xue feng Dai , Zu guo Chen , Chao Yang , Lai hao Jiang , Biao Cai
The lack of the latest measurement information and the Particle serious degradation cause low estimation precision in the tradition particle filter SLAM (simultaneous localization and mapping). For solve this problem, a SRCPF-SLAM (square cubature particle filter simultaneous localization and mapping) is proposed in this paper. The algorithm fuses the latest measurement information in the stage of the prior distribution updated of the particle filter SLAM. It designs importance density function by SRCKF (Square-root Cubature kalman filter) that is more close to the posterior density, and it spreads the square root of state covariance. So, the algorithm ensures the symmetry and the positive semi-definiteness of the covariance matrix and improves numerical estimation precision and stability. The simulation results show that the proposed algorithm has higher accuracy of the state estimation when compared with the the PF-SLAM (particle filter simultaneous localization and mapping) algorithm, EPF-SLAM (extend particle filter simultaneous localization and mapping) algorithm and the UPF-SLAM (unscented particle filter simultaneous localization and mapping) algorithm. DOI : http://dx.doi.org/10.11591/telkomnika.v12i6.5059
Volume: 12
Issue: 6
Page: 4206-4214
Publish at: 2014-06-01

Inculcation Method of Character Education Based on Personality Types Classification in Realizing Indonesia Golden Generation

https://ijere.iaescore.com/index.php/IJERE/article/view/4466
M.J. Dewiyani Sunarto , Tri Sagirani
"The rise of Indonesia Golden Generation" is the theme of National Education Day in 2012, In an effort to create a golden generation, education must be interpreted as a complex problem, in particular the cultivation of character education that was originally using indoctrination method. Given the shifting of the changing times,indoctrination methods are imprecise because young people today would not accept the doctrine of no logic that can be digested. Regarding the condition, this research has to find a method that more focus on thinking process which can be accepted by learners. The method used is the inculcation method. The inculcation method will be approached through different personality types that are classified based on the type of personality by David Keirsey. Using exploratory qualitative approach for curricular activities and natural activitiesforextra-curricular activities, the research obtained the character education inculcation method that more personal, so this will be move striking for self learner, as it is based on the profile of each individual's cognitive (thinking) process on the personality type. The development of this research is the creation of a character education learning model with inculcation method based on classification of personality type.DOI: http://dx.doi.org/10.11591/ijere.v3i2.4199
Volume: 3
Issue: 2
Page: 91-98
Publish at: 2014-06-01

Research on End-to-End Delay Performance Based on GPS Scheduling System

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/3518
Wang Yang , Zhou Jin-he , Ye Keng
This paper summarizes some results of network calculus. It derives the bounds on end-to-end delay and effective bandwidth by network based on leaky bucket regulators. The simulation results show that the network calculus is a good fit for calculating end-to-end delay. And it provides effective control, scheduling and management in the integration network conditions in the following step. DOI : http://dx.doi.org/10.11591/telkomnika.v12i6.5474
Volume: 12
Issue: 6
Page: 4400-4404
Publish at: 2014-06-01

Analysis of Quality in Public and Private Universities in Bangladesh and USA

https://ijere.iaescore.com/index.php/IJERE/article/view/4467
Quamrul H Mazumder
To meet the growing need for increased capacity in higher education, the government of Bangladesh encouraged development of private universities in 1992.  Currently, there are sixty private universities1, thirty-four public universities2 and  three international universities in Bangladesh3.  Although the increased number of universities has provided opportunities, a debate has emerged over the quality at these institutions due to significant difference among these institutions.  These inconsistencies in quality may be due to the lack of regulatory oversight and inefficiencies of the regulatory agencies of the government.  The cost of education at private universities is high compared to significantly lower cost at public universities that are subsidized by the government.  In spite of the higher cost, student satisfaction levels have not been higher at private universities in the past4.  The work presented in this paper seeks to determine the quality of education in public and private universities in Bangladesh using student satisfaction as a measure of quality.  It is well understood that student satisfaction measure may not be the only indicator of quality, but it can be considered as one of the important indicators.   The survey questions were modified to adapt them to the context of Bangladesh.   The twenty-two question survey results from private and public university students of Bangladesh were compared to determine the level of student satisfaction.  The results of the current study were compared with the SSI data of US private and public universities.  Results of the current study  showed that the students in public universities of Bangladesh had lowest level of satisfaction and the private universities of Bangladesh had highest satisfaction The results derived from this data can be used by both public and private universities for improving quality in higher education.DOI: http://dx.doi.org/10.11591/ijere.v3i2.2886
Volume: 3
Issue: 2
Page: 99-108
Publish at: 2014-06-01

Modeling of Wind Energy on Isolated Area

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/4999
Hachemi Glaoui , Harrouz Abdelkader , Ismail Messaoudi , Hamid Saab
In this paper, a model of the wind turbine (WT) with permanent magnet generator (PMSG) and its associated controllers is presented, The increase of wind power penetration in power systems has meant that conventional power plants are gradually being replaced by wind farms. In fact, today wind farms are required to actively participate in power system operation in the same way as conventional power plants. In fact, power system operators have revised the grid connection requirements for wind turbines and wind farms, and now demand that these installations be able to carry out more or less the same control tasks as conventional power plants. For dynamic power system simulations, the PMSG wind turbine model includes an aerodynamic rotor model, a lumped mass representation of the drive train system and generator model. In this paper we propose a model with an implementation in MATLAB / Simulink, each of the system components off-grid small wind turbines.DOI: http://dx.doi.org/10.11591/ijpeds.v4i2.4859
Volume: 4
Issue: 2
Page: 274-280
Publish at: 2014-06-01

A Dual-Microphone Speech Enhancement Algorithm for Close-Talk System

10.11591/ijeecs.v12.i6.pp4475-4484
Yi Jiang , Zhenming Feng , Yuanyuan Zu , Xi Lu
While human listening is robust in complex auditory scenes, current speech enhancement algorithms do not perform well in noisy environments, even close-talk system is used. This paper addresses the robustness in dual microphone embedded close talk system by employing a computational auditory scene analysis (CASA) framework. The energy difference between the two microphones is used as the primary separation cue to estimate the ideal binary mask (IBM). We also use voice activity detection to find the noise periods, and update the separation critical value. Generalization interference locations and reverberant conditions are used to examine performance of the proposed system. Evaluation and comparison show that the proposed system outperforms other two systems on the test conditions. DOI : http://dx.doi.org/10.11591/telkomnika.v12i6.5485
Volume: 12
Issue: 6
Page: 4475-4484
Publish at: 2014-06-01

Perceived Importance of ICT in Preparing Early Childhood Education Teachers for the New Generation Children

https://ijere.iaescore.com/index.php/IJERE/article/view/4469
Olowe Peter Kayode , KUTELU Bukola Olaronke
Children of the present age are born into the world that is highly driven by Information and Communication Technology (ICT). They begin to manipulate ICT materials as soon as they grow old enough to manipulate things. There is need therefore to provide ICT-learning experiences that can aid their holistic development. To do this, early childhood professionals must be positive about the roles of ICT in children’s development. This study therefore investigated the perception of Early Childhood Education (ECE) lecturers and students on the importance of ICT in preparing ECE teachers for the new generation children. The study adopted the descriptive survey research design. 10 lecturers and 300 students of ECE were purposively selected as sample. One validated questionnaire titled “Questionnaire on Information and Communication Technology” (0.83) was used. Data collected was analysed using percentage, mean and standard deviation. Findings revealed that, using ICT in preparation of ECE teachers can help them to facilitate children’s cognitive, physical and social-emotional development, and as well sustain children’s interest in learning.Recommendations include training of all Nigerian ECE lecturers in the use of ICT for teaching and learning and equipment of departments of ECE in Nigerian Colleges of Education and Universities with adequate and relevant ICT materials.DOI: http://dx.doi.org/10.11591/ijere.v3i2.5405
Volume: 3
Issue: 2
Page: 119-124
Publish at: 2014-06-01

Critical Analysis of the Problems of Education in Pakistan: Possible Solutions

https://ijere.iaescore.com/index.php/IJERE/article/view/4464
Iqbal Ahmad , Kahil ur Rehman , Asghar Ali , Itbar Khan , Fazal Akber Khan
Education lays the foundation for political, social and economic development of any country. A viable education system enables the nation to achieve its national goals. Pakistan as a developing country has faced critical problems of education since its inception and therefore, the system of education has failed to deliver according to the aspirations of the nation. There are various factors responsible for this situation. This paper explores some of the critical problems that have so far plagued the education system of Pakistan. On the basis of critical review of available literature, the paper presents solutions to the existing problems of the education system of Pakistan.DOI: http://dx.doi.org/10.11591/ijere.v3i2.1805
Volume: 3
Issue: 2
Page: 79-84
Publish at: 2014-06-01
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