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24,092 Article Results

A Relaying Scheme for Terrestrial Digital Multimedia Broadcasting (TDMB) Cooperative Network

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/3539
Jin Ren
Terrestrial Digital Multimedia Broadcasting (TDMB) is one popular broadcasting standard that enable digital television transmissions to hand held receivers and cooperative system take advantage of the broadcast nature of wireless channels, uses relay stations as virtual antennas. Relay stations are an attractive solution to penetrate the wireless system with lower transmitting power at the Base station. In this paper, we presented a scheme can switch on/off the power weighting ratio between Base station and Relay station in TDMB cooperative Network. It will control the active relays in different channel propagations effectively. DOI : http://dx.doi.org/10.11591/telkomnika.v12i6.5399
Volume: 12
Issue: 6
Page: 4550-4556
Publish at: 2014-06-01

Student’s Perception and Attitudes toward Public Health Profession and National Competency Examination

10.11591/ijphs.v3i2.4685
Lafi Munira , Lina Handayani
One form of quality assurance is convening public health’s national competencies examination in academic phase which is conducted before students graduate from university. The purpose of this study was to determine students’s perceptions and attitudes about public health’s profession and national competencies examination. The design of this study was descriptive qualitative employed case study approach. Focus group discussion was used to collect data. Data were analyzed by content analysis. Students felt less confident about their identity profession so that requires motivation by lecturer. Students expressed the need to improve public health graduates’s competencies since academic phase. National competencies examination is important to do as a solution to guarantee the graduates’s quality. Implementation of the competencies test is need to consider aspects of management and technical readiness. National competencies examination is a tool that could proves the identity of public health graduates’s competencies. Everyone with a public health background should know that there will be a competency test then they should have an adequate preparation.
Volume: 3
Issue: 2
Page: 137-142
Publish at: 2014-06-01

Highly Effective Algorithm of the Threshold Detection in the Cognitive Radio

10.11591/ijeecs.v12.i6.pp4500-4504
Qing Long Xu , Zhan Gao
Opportunistic spectrum access (OSA) is a key technique enabling the secondary users (SUs) in a cognitive radio (CR) network to transmit over the “spectrum holes” unoccupied by the primary users (PUs). In contrast to OSA, with spectrum sharing (SS) is allowed to transmit regardless of the PU’s on/off status, provided that the resulting interference to PU is kept below a predefined threshold. In this paper, we focus on the threshold detection algorithm study for spectrum sharing, which aims to get the SIR of the PUs as quickly and precisely as possible. We propose a dichotomy algorithm with lower complexity and more quickly in contrast to the traditional full search algorithm. Numerous simulation results are provided to validate the proposed algorithm. DOI: http://dx.doi.org/10.11591/telkomnika.v12i6.5489
Volume: 12
Issue: 6
Page: 4500-4504
Publish at: 2014-06-01

The Modeling and Stress Analysis of Wind Turbine Blade

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/3487
Hao Wang , Bing Ma , Jiaojiao Ding , Shuaibin Li
With the development of wind power generation technology, the wind turbine blade is becoming more and more important. Modeling and stress analysis of the wind turbine blade are very critical for the further design and the application of wind turbine blade. The small-scale wind turbine blade was focused on, considering the glass fiber reinforced plastic material. Based on the parameters of airfoil and the geometrical parameters of blade, the three-dimension model of blade was established with the modeling software. Then the model was introduced into ANSYS software to carry out the FEM analysis. According to the displacement solution of blade, the maximal displacement occurs in the blade tip while working, but it is less than the safety displacement of wind turbine. And the stress concentration occurs in the center of the blade, which corresponds to the comprehensive stress from the elastic stress solution of the wind turbine blade.Last, it can be found that the thermal stress does not play a major role from the thermal stress solution. The FEM results were compared with the tensile strength of the material and the safe displacement. Therefore, the effectiveness of FEM model and real safety of blade were verified. DOI : http://dx.doi.org/10.11591/telkomnika.v12i6.5536
Volume: 12
Issue: 6
Page: 4178-4183
Publish at: 2014-06-01

Fish Marketing Status with Formalin Treatment in Bangladesh

10.11591/ijphs.v3i2.4680
Shatabdi Goon , Munmun Bipasha , Md. Saiful Islam , Md. Bellal Hossain
Fish possess an extremely strong cultural attachment considering irreplaceable animal food source in Bangladeshi diet beset with nutritional importance. It has been getting endangered by abominable practice of formalin in marketing leaded by some deceitful traders counting profit beyond ethical attainment and endangering public health. This paper outlines the formalin extremity with a several years practice in fish marketing involving almost 5% city markets with a petty heterogeneity comprising contrastive and potential strategy with formalin access. Regardless, this formalin corruption affiliated with deleterious health aggravations both for traders and consumers, comes out with impotency in workforce contravening economical influence on overall national prosperity.
Volume: 3
Issue: 2
Page: 95-100
Publish at: 2014-06-01

Islanding Detection Algorithm Based on Adaptive Voltage Positive Feedback

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/3519
Jihong Zhang , Zhenkui Wu , Hua Li , Hanshan L I , Yongfeng Ren
Islanding detection is an essential function of the grid-connected inverter of distributed power generation system. The deficiency of traditional islanding detection methods should be given due importance, especially the phenomena such as islanding detection failure when the output power of the inverter balances with the load power, and the use of active frequency and phase shifting method affecting the quality of power. In this regard, an improved islanding detection method based on adaptive voltage positive feedback was proposed. A mathematical model was established, and the hardware circuit was tested. The constraint conditions on the success of islanding detection and the pattern of voltage variation at the point of common coupling before and after incorporation to the grid were studied. The simulation result shows that this method has the advantages of high detection speed, small blind area and high reliability. The index requirements specified in IEEE Std.2000-929 are met. The reasonability of the proposed scheme is verified. DOI : http://dx.doi.org/10.11591/telkomnika.v12i6.5475 
Volume: 12
Issue: 6
Page: 4405-4412
Publish at: 2014-06-01

Severe-Dynamic Tracking Problems Based on Lower Particles Resampling

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/3562
Xungao Zhong , Xiafu Peng , Xunyu Zhong
For a target as it with large-dynamic-change which is still challenging for existing methods to performed robust tracking. The sampling-based Bayesian filtering often suffer from computational complexity associated with large number of particle demanded and weighing multiple hypotheses. Specifically, this work proposes a neural auxiliary Bayesian filtering scheme based on Monte Carlo resampling techniques, which to addresses the computational intensity that is intrinsic to all particle filter, including those have been modified to overcome the degeneracy of particles. Tracking quality for severe-dynamic experiments demonstrate that the neural via compensate the Bayesian filtering error, with high accuracy and intensive tracking performance only require lower particles compare with sequential importance resampling Bayesian filtering, meanwhile, our method also with strong robustness for low number of particles. DOI : http://dx.doi.org/10.11591/telkomnika.v12i6.5493
Volume: 12
Issue: 6
Page: 4731-4739
Publish at: 2014-06-01

Marine Sink-Float Safety Device’s Control System Based on Fuzzy Control

10.11591/ijeecs.v12.i6.pp4787-4793
Zi Yue Wu , Jie Qi , Chen Nan Xue
In order to ensure safety work of marine equipment, this paper introduces a kind of sink-float safety device which can match with marine equipment to realize protection work, and a fuzzy controller set up by fuzzy control algorithm. The data of the control system is collected by multi-sensor and filtered through the filter circuit. Under a 5 grade sea condition, the marine sink-float safety device can carry marine equipment, escaping from the harsh marine environment by diving to a certain depth. The simulation in MATLAB/Simulink shows that the control system could response fast and operate stably. Furthermore, it is able to control sink-float safety device efficiently and reach to the preset depth accurately. So we can guarantee the operation of marine equipment reasonably.
Volume: 12
Issue: 6
Page: 4787-4793
Publish at: 2014-06-01

GUI based Testing Tool for Transformer

https://ijece.iaescore.com/index.php/IJECE/article/view/5584
K. Suryasen , K.V. Devadas , Harish. A
The objective of this paper is to develop an educational toolbox using GUI for analysis of transformers for students and lecturers.  GUI figure file is developed for Open Circuit & Short Circuit Test, Sumpner’s Test, All day efficiency (Energy efficiency) of transformer and parallel operation of two transformers.  All this kinds of problems consists of various methods of mathematical calculation which is difficult to perform by using manual calculation (formula and calculator). The existence of this educational toolbox will help the user to calculate the parameter hence the calculation become faster and easier. The user can enter the data and obtained the results quickly in the form of data or figures.  The students can also observe the effect of variation of input parameters on performance of transformer.   This educational toolbox was developed by using MATLAB software.DOI:http://dx.doi.org/10.11591/ijece.v4i3.5213
Volume: 4
Issue: 3
Page: 359-365
Publish at: 2014-06-01

A Smart E-Learning System for Social Networking

https://ijece.iaescore.com/index.php/IJECE/article/view/5600
M.R.M Veeramanickam , N. Radhika
With the development of Cloud Computing, the popularity of E learning, the increasing of social networking services, Smart Cloud E-Learning System with Social Networking has become a research topic. The characteristics of E learning Cloud and requirements of Social networking services in environments raise a challenge on building an Architecture and Implementation quite strong.  In this paper, we elaborate a Smart Cloud E-Learning System with Social Networking based on architecture level of social networking and E learning cloud system to support E learning interactions in worldwide environments.  A prototype of Cloud E-Learning System with Social Networking is developed on cloud, and several applications features are described based on the proposed architecture to demonstrate the effectiveness of the architecture.DOI:http://dx.doi.org/10.11591/ijece.v4i3.5933
Volume: 4
Issue: 3
Page: 447-455
Publish at: 2014-06-01

Total Variation Differential Equation with Wavelet Transform for Image Restoration

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/3564
Donghong Zhao
To overcome the staircasing effects and simultaneously avoid edge blurring, We present an adaptive partial differential equation combining the total variation with wavelet transform for image restoration. A noise removal algorithm based on variation method and partial difference equations is proposed in this paper. The combining algorithm takes the advantage of both filters since it is able to preserve edges while avoiding the staircase effect in smooth regions. The TV method provides fast adaptive wavelet-based solvers for the TV model. Our approach not only employs a wavelet collocation method applied to the TV model using two-dimensional anisotropic tensor product of wavelets, but also proposes the differential equation for image restoration. Most conventional image processors consider little the influence of human vision psychology. The algorithm inherently not only combines the restoration property of wavelet compression algorithms with that of the TV model, but also gives a relative new TV functional which considers the influence of human vision psychology. We present a detailed description of our method which indicates that a combination of wavelet based restoration techniques with the TV model produces superior results. Experimental results illustrate the effectiveness of the model image restoration. DOI : http://dx.doi.org/10.11591/telkomnika.v12i6.5495
Volume: 12
Issue: 6
Page: 4747-4755
Publish at: 2014-06-01

A Java Program of Feature Extraction Algorithms for Protein Sequences

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/3508
Shanping Qiao , Baoqiang Yan
Prediction of protein subcellular localizations attracted the eyes of many researchers and hence a serial of computational approaches which aimed at designing an effective learning machine to deal with the newly-found protein sequences on the base of the feature vector were developed in the last two decades. The feature extraction algorithm for protein sequences played a vital role actually. The information in the feature vector influenced the performance of the learning algorithm significantly. In order to facilitate users to build predicting system, three feature extraction algorithms about amino acid composition were introduced, improved and implemented in a Java program. By comparing the results with those from some web servers, it was proved that this program ran normally and had good performance both in time costing and user interface. Moreover, the results could be easily saved to the specified file for later use. It was anticipated that this program would give some help to researchers. DOI : http://dx.doi.org/10.11591/telkomnika.v12i6.4689
Volume: 12
Issue: 6
Page: 4322-4329
Publish at: 2014-06-01

Design and Research of Urban Video Surveillance System

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/3498
Peng He , Tianzhong Guo , Jingran An
This paper aimed to design and realized Qiqihar urban video surveillance system and use advanced design solutions to improve the traditional city video surveillance system based on EPON technology. Hierarchical design was proposed and a detailed analysis of each design was given. The system not only has expanded capabilities in the structure, but also has integrated application capabilities in the business, including image transmission, remote monitoring, remote centralized digital image data storage, remote real-time on-demand playback (stored data image). The result shows that the system can completely solve the digitization of the monitoring system and the process of networking bottlenecks. DOI : http://dx.doi.org/10.11591/telkomnika.v12i6.3631
Volume: 12
Issue: 6
Page: 4243-4249
Publish at: 2014-06-01

Realization of Direct Current System Insulation Monitoring Device Based on Fault Amplifying Method

10.11591/ijeecs.v12.i6.pp4485-4490
Zhou Jun , Yang Sheng-qiang , Zhu Bo-nan
This paper has analyzed the existing direct current (DC) system insulation monitoring methods. In view of poor anti-jamming and low sensitivity of existing methods, a new insulation monitoring device is designed based on Fault amplifying method. Under the condition of ensuring system security, the device detection resistors are put into the system by control switches, data is collected by the sensors and set to host computer by CAN bus. At last, the host determines insulation condition of the system by calculating the insulation resistances. This paper has introduced the main test circuit and program flow chart. It is verified by experiments and field operation that the device which is perfectly suitable for online DC insulation monitoring of power plants and transformers can monitor the insulation condition of system accurately and the sensitivity is high. DOI: http://dx.doi.org/10.11591/telkomnika.v12i6.5486
Volume: 12
Issue: 6
Page: 4485-4490
Publish at: 2014-06-01

Realization of Programmable BPSK Demodulator-Bit Synchronizer using Multirate Processing

https://ijece.iaescore.com/index.php/IJECE/article/view/5596
Anshuman Sharma , Abdul Hafeez Syed , Midhun M , M R Raghavendra
This paper presents the design and implementation of programmable BPSK demodulator and bit synchronizer. The demodulator is based on the Costas loop design whereas the bit synchronizer is based on Gardner timing error detector. The advantage of this design is that it offers programmability using multi-rate processing and does not rely on computation of filter coefficients, NCO angle input for each specific data rate and thus avoids computational complexities. The algorithm and its application were verified on Matlab-Simulink and was implemented on ALTERA platform. A 32 kHz BPSK demodulator–bit synchronizer pair catering for data rates from 1 kbps to 8 kbps was implemented.DOI:http://dx.doi.org/10.11591/ijece.v4i3.5561
Volume: 4
Issue: 3
Page: 433-440
Publish at: 2014-06-01
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