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INDONESIA
Indonesian Journal of Electrical Engineering and Computer Science
ISSN : 25024752     EISSN : 25024760     DOI : -
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Articles 48 Documents
Search results for , issue "Vol 12, No 12: December 2014" : 48 Documents clear
Application of Value Assessment Weights in Conservation of Modern Architectural Heritage Song Gang; Yang Changming; Hao Chen; Ran Yanping
Indonesian Journal of Electrical Engineering and Computer Science Vol 12, No 12: December 2014
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v12.i12.pp8312-8318

Abstract

This study presents the weights of various indicators in the integrated conservation of our modern architectural heritage. In the AHP (Analytic Hierarchy Process), the Delphi method and Entropy method are integrally adopted to set up the evaluation indicator system of the conservation efforts, and the weight coefficient of evaluation indicators. Through the analysis, we can find that modern architectural heritages not only have the three basic values historical, artistic and scientific values, but also have significant environmental,cultural emotional and real estate values. In the assessment system, artistic and historical values are the priorities among those first-level indicators, and the real estate value is the last one. Among the second-level indicators, representative architectural art is the most important factor. Consequently, the emphases should be placed on the artistic and historical values of modern architectural heritages.
Emperical Computation of Solar Radiation and Determination of Regression Coefficients for Khulna City Mohammad Arif Sobhan Bhuiyan; Abdus Sobhan Bhuiyan; Muhammed Jamshed Alam Patwary; Subrina Akter; Mohammad Monjur Alam
Indonesian Journal of Electrical Engineering and Computer Science Vol 12, No 12: December 2014
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v12.i12.pp8015-8021

Abstract

This study is accomplished to calculate global, diffuse and direct solar radiation empirically on a horizontal surface for the divisional district “Khulna” in Bangladesh (latitude 22o47΄N and longitude 89o34΄E) as well as to predict correlations for it by using several meteorological data for 32 years between 1980 and 2012. The global radiation is found to be maximum in the month of April and minimum in the month of December here. The estimated values of the Angstrom’s regression constants a and b are 0.2388 and 0.5228 respectively. The other regression constants were also computed and the correlations proposed for Khulna can be used in future for the estimation of global, diffuse and direct solar radiation if the meteorological parameters remain available.
An Empirical Evaluation of Topologies for Large Scale NoC Mehdi Baboli; Nasir Shaikh Husin
Indonesian Journal of Electrical Engineering and Computer Science Vol 12, No 12: December 2014
Publisher : Institute of Advanced Engineering and Science

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Abstract

In the past decades, processing power has achieved considerable gains. Researchers proposed faster uniprocessors that are capable of improving the instruction level parallelism through out-of-order implementation for increasing the performance quality of the existing network-on-chip (NoC). Although, the reducing returns of the performance of uniprocessor architecture caused multiprocessors to be integrated on a chip. In this paper, we selected a famous popular NoC topology, i.e., mesh, and evaluated it in terms of different figures of merit e.g., latency, power consumption, and power/throughput ratio under different routing algorithms, number of buffer, and hotspot traffic models. We selected two size of NoC, 12×12 and 16×16, as large scale NoC. We investigated all characteristics and measured latency, maximum delay, and total energy by Noxim simulator. In this paper, we demonstrated that when the network size and number of buffer were large, no routing algorithm could contribute to improve network performance. This is because the routing algorithms had the same performance in the large scale NoCs and they could not solve problems alone. Therefore, for a large scale system, the topology has a major impact on the performance and cost of the network. http://dx.doi.org/10.11591/telkomnika.v12i12.6840 
A Difference-Based Feature Description Method of Image Target Qiang Gao; Wu Yang; Hongye Yang
Indonesian Journal of Electrical Engineering and Computer Science Vol 12, No 12: December 2014
Publisher : Institute of Advanced Engineering and Science

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Abstract

This paper proposed a new method of feature description for target recognition and matching. Firstly, a method of calculating the difference was defined. The gray value matrix of an image was converted to a difference value matrix. Then the difference value, shape, angle and other features of a region and the combined features between regions were described. Finally, the method was applied to identify traffic signs. Experiments showed that the proposed method can represent multiple features of image such as the gray differences, the shape changes, and so on. Through theoretical and simulation analysis, even under rotation, shift or scale transformation, new features description method still can correctly recognize the target.  http://dx.doi.org/10.11591/telkomnika.v12i12.6568 
Study on Smart Grid System Based on System Dynamics Cui He-Rui; Xu Peng
Indonesian Journal of Electrical Engineering and Computer Science Vol 12, No 12: December 2014
Publisher : Institute of Advanced Engineering and Science

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Abstract

Smart Grid is a large complex system, involving generation, transmission, distribution and delivery of four links. This paper analyzes the structure of the smart grid system in depth with a combination of qualitative and quantitative research approach. Then it explains state variables, rate variables and constants in the development of smart grid system under the Vensim software environment and analyzes subsystems causal feedback relationship in a macro point of view. Finally, this paper analyzes the simulation on the amount of funding and professionals in the smart grid system dynamics flow diagram after inputting DYNAMO language equations. The simulation analysis shows that the development of the smart grid should focus on training professionals. Professional talent is a source of strength in the smart grid development. At the same time, we should also pay attention to industrial policy related to the smart grid and seek break under the guidance of policy. http://dx.doi.org/10.11591/telkomnika.v12i12.5986 
Modeling and Simulation of Grid Interfaced Synchronous Generator with Controller S. Sridharan; N. Manonmani
Indonesian Journal of Electrical Engineering and Computer Science Vol 12, No 12: December 2014
Publisher : Institute of Advanced Engineering and Science

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Abstract

The increasing demand of electric power necessitates the establishment of new generating stations. Wind energy conversion system (WECS) is more attractive due to its mature and clean aspects. The wind turbine driven with permanent magnet synchronous generator (PMSG) feeds ac power to utility grid. For this purpose two voltage source converters are connected back to back between rotor terminals and grid via common dc link. In order to satisfy the grid code requirements such as grid stability, power quality improvement, and power control this machine is usually used. In this paper the complete mathematical modelling and simulation of wind turbine driven PMSG has been done. The stator and rotor of PMSG is connected to the grid  through back to back connected two voltage source converters with a common DC link. The total system is modeled and simulated for better power quality and is capable of harnessing maximum power at various wind speeds. A new control strategy known as perturb and observation (P&O) controller is introduced in WECS for maximum power point tracking (MPPT) to improve the system operation. The simulation is done in MATLAB Simulink environment.  http://dx.doi.org/10.11591/telkomnika.v12i12.6884 
A New Image Encryption Algorithm Based on Two-dimensional Coupled Chaotic Map Li Tu; Liyuan Jia; Chi Zhang; Saiqiu Guo
Indonesian Journal of Electrical Engineering and Computer Science Vol 12, No 12: December 2014
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v12.i12.pp8229-8237

Abstract

In this paper, a kind of two-dimensional coupled chaotic transcendental map (TCCTM) was proposed. Firstly, by using the TCCTM chaotic sequences were generated,then the chaotic sequences were modified to generate chaotic key stream that is more suitable for image encryption. In the process of encryption, an original color image was decomposed into three images of red, green and blue components, and encrypted them in a different way respectively.  The experimental results demonstrate that the extremely sensitive to the key, the encrypted image has random-like distribution behavior of grey values, the adjacent pixels have zero co-correlation properties. Furthermore, the algorithm shows the advantages of large key space and high speed of encryption.
Analysis of variable speed chopper fed Brushless Direct Current motor Jeya Selvan Renius; Vinoth Kumar K; Raja Guru; Arnold Fredderics
Indonesian Journal of Electrical Engineering and Computer Science Vol 12, No 12: December 2014
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v12.i12.pp8060-8068

Abstract

This paper provides the detailed analysis of the DC-DC chopper fed Brushless DC motor drive used for low-power applications. The various methods used to improve the power quality at the ac mains with lesser number of components are discussed. The most effective method of power quality improvement is also simulated using MATLAB Simulink. Improved method of speed control by controlling the dc link voltage of Voltage Source Inverter is also discussed with reduced switching losses. The continuous and discontinuous modes of operation of the converters are also discussed based on the improvement in power quality. The performance of the most effective solution is simulated in MATLAB Simulink environment and the obtained results are presented.
Improved Reaching Law Sliding Mode Control Algorithm Design For DC Motor Based on Kalman Filter Li Liu
Indonesian Journal of Electrical Engineering and Computer Science Vol 12, No 12: December 2014
Publisher : Institute of Advanced Engineering and Science

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Abstract

Aiming at the inaccurately modeling and some uncertain existing in servo system seriously affected the control quality and the instability problem, sliding mode control algorithm with improved reaching law is proposed in this paper. The improved reaching law is used to weaken the chattering problem existing in the sliding mode control. Also the kalman filter is used to inhibit the interference, which make the servo system have strong anti-interference ability and the ability of weakening the chattering problem existing in the sliding mode control. The simulation results show that the algorithm can effectively inhibit the external disturbance and noise existing in the system, and make the system have strong anti-interference ability. At the same time, the chattering also is obviously inhibited, and the method makes the system stability and control quality been further improved.  http://dx.doi.org/10.11591/telkomnika.v12i12.4905 
Study on the Evaluation Ability of Personalized Information Service of Higher Vocational Library XinJuan Zhou; Meiying Nie
Indonesian Journal of Electrical Engineering and Computer Science Vol 12, No 12: December 2014
Publisher : Institute of Advanced Engineering and Science

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Abstract

Higher vocational library personalized service, refers to the user's preferences, habits, such as unique requirements for information services, it is aimed at higher vocational teachers and students in the teaching, scientific research and the different needs of a corresponding type of service. The root of the individualized service is to respect the user, the user's behavior and habits, for the user to select more important resources and provide the more thoughtful service characteristics. From constructing the high vocational school library personalized service guarantee system, perfecting the high vocational school library personalized service content and construct the high vocational school library personalized service interaction mechanism to promote higher vocational library personalized information service to improve efficiency. In the final analysis, the high vocational school library personalized information service ability evaluation of first and second index, the result is satisfactory. http://dx.doi.org/10.11591/telkomnika.v12i12.4893 

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