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INDONESIA
Indonesian Journal of Electrical Engineering and Computer Science
Published by Institute of Advanced Engineering and Science
ISSN : 25024752     EISSN : 25024760     DOI : -
Core Subject :
Arjuna Subject : -
Articles 101 Documents
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Search results for , issue "Vol 12, No 2: February 2014" : 101 Documents clear
Sliding Mode Robustness Control Strategy for Shearer Height Adjusting System Xiuping Su; Wei Li
Indonesian Journal of Electrical Engineering and Computer Science Vol 12, No 2: February 2014
Publisher : Institute of Advanced Engineering and Science

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Abstract

This paper firstly established mathematical model of height adjusting hydro cylinder of the shearer, as well as the state space equation of the shearer height adjusting system. Secondly we designed a shearer automatic height adjusting controller adopting the sliding mode robustness control strategy. The height adjusting controller includes the sliding mode surface switching function based on Ackermann formula, as well as sliding mode control function with the improved butterworth filter. Then simulation of the height adjustment controller shows that the sliding mode robustness control solves buffeting of typical controller, and achieves automatic control for the rolling drum of the shearer. DOI : http://dx.doi.org/10.11591/telkomnika.v12i2.3734
The Analysis of Customer Switching Choice in China Mobile Market Lianjv Ning; Xin Feng
Indonesian Journal of Electrical Engineering and Computer Science Vol 12, No 2: February 2014
Publisher : Institute of Advanced Engineering and Science

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Abstract

The exploratory research on subscribers' switching choice has vital theoretical and practical value. We present eighteen factors which influence subscribers' switching intention based on the Discrete Choice Model, and then establish the DCM for subscribers' switching intention of the 3G/4G operators in China. With a consumer oriented perception, variables are divided into four parts, including subscriber’s characteristics, mobile usage traits, terminal needs and satisfaction. Based on the survey data supported by China Academy of Telecommunication Research of MIT, the study illustrates that there are six factors significantly affects the subscribers switching choice respectively in two scenarios(with MNP or not), but in either scenario they are not all the same. The results of the model provide a strong evidence for operators' decision-making of subscription design and 3G/4G marketing strategies, and it will enhance subscriber holdings of the 3G/4G operators. Meanwhile, it will support the authority to make proper asymmetric MNP policy. DOI: http://dx.doi.org/10.11591/telkomnika.v12i2.3822
Distributed Regional Weighted Multidimensional Scaling for Network Coordinate System Cong Wang; Fengli Zhang; Min Li
Indonesian Journal of Electrical Engineering and Computer Science Vol 12, No 2: February 2014
Publisher : Institute of Advanced Engineering and Science

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Abstract

Network Coordinate System embeds all nodes into a specific metric space and estimate the latency between any node-pair through computing the corresponding metric distance with low-cost. But the metric space is usually uniform while the Internet is heterogeneous since different autonomous systems (AS) always have different routing strategies. To make full use of the clustering characteristic for improving the latency estimating accuracy without any prior knowledge, this paper judges the reference nodes are in the same AS with the target node or not through the metric distance between the target node and the source, and weights them by the Gaussian kernel function. Then the source node can computes a new coordinate to estimatesthe latency between the target node and itself more precisely. The experiments show this mechanism can reduce the Stress criterion of the entire system by 19.38% without any additional communication overhead, its computation cost is also very small at the same time. DOI : http://dx.doi.org/10.11591/telkomnika.v12i2.3817
The Harmonic Current Detection Method Based on Improved SVSLMS Algorithm LI Sheng-qing; ZENG Huan-yue; HE Zheng-ping
Indonesian Journal of Electrical Engineering and Computer Science Vol 12, No 2: February 2014
Publisher : Institute of Advanced Engineering and Science

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Abstract

Harmonic current detection method plays a very important role in the harmonic compensation effect. This paper presents an improved Sigmoid Variable Step-size Least Mean Square (SVSLMS) harmonic current detecting method based on the analysis of the steady-state error generated by traditional SVSLMS, This method re-define and select the feedback error coefficient, By using a frequency-selective filter for filtering the original feedback error, to reduce the effects of harmonics on detection performance, further improve the response speed and steady precision. Simulation results verify the effectiveness and practicality of this method. DOI : http://dx.doi.org/10.11591/telkomnika.v12i2.4174 
Checkpoint and Replication Oriented Fault Tolerant Mechanism for MapReduce Framework Yang Liu; Wei Wei; Yuhong Zhang
Indonesian Journal of Electrical Engineering and Computer Science Vol 12, No 2: February 2014
Publisher : Institute of Advanced Engineering and Science

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Abstract

MapReduce is an emerging programming paradigm and an associated implementation for processing and generating big data which has been widely applied in data-intensive systems. In cloud environment, node and task failure is no longer accidental but a common feature of large-scale systems. In MapReduce framework, although the rescheduling based fault-tolerant method is simple to implement, it failed to fully consider the location of distributed data, the computation and storage overhead. Thus, a single node failure will increase the completion time dramatically. In this paper, a Checkpoint and Replication Oriented Fault Tolerant scheduling algorithm (CROFT) is proposed, which takes both task and node failure into consideration. Preliminary experiments show that with less storage and network overhead.CROFT will significantly reduce the completion time at failure time, and the overall performance of MapReduce can be improved at least over 30% than original mechanism in Hadoop. DOI : http://dx.doi.org/10.11591/telkomnika.v12i2.4324  
Medical Image Retrieval Based on Shape Features in DCT Domain Ling Xia; Zhi Peng; AnDong Cai; Haibin Wang
Indonesian Journal of Electrical Engineering and Computer Science Vol 12, No 2: February 2014
Publisher : Institute of Advanced Engineering and Science

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Abstract

Compressed medical images are widely used in clinical teaching and diagnosis. To save computing cost and storage spaces, research on compressed medical image retrieval is meaningful. This paper proposes a novel medical image retrieval scheme in DCT (Discrete Cosine Transformation) compressed domain. We firstly obtain the multi resolution image by reorganizing the DCT coefficients, then, segment the medical image’s ROI (Region of Interest) and acquires the shape binary image in DCT compressed domain. We use Hu invariant moments to extract shape feature vectors, and measure the similarity by weighting method. Experiments were carried out on an image database which contains 1000 medical CT images. The experimental results show that this algorithm can correctly extract shape features of ROI and get good retrieval performance on JPEG medical images. DOI : http://dx.doi.org/10.11591/telkomnika.v12i2.4413 
On the Design of Laser Structured Ka Band Multi-Chip Module Ghulam Mehdi; Hu Anyong; JUngang Miao
Indonesian Journal of Electrical Engineering and Computer Science Vol 12, No 2: February 2014
Publisher : Institute of Advanced Engineering and Science

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Abstract

The rapid prototyping of millimeter wave (MMW) multi-chip module (MCM) on low-cost ceramic-polymer composite substrate using laser ablation process is presented. A Ka band MCM front-end receiver is designed, fabricated and tested. The complete front-end receiver module except the IF and power distribution sections is realized on the single prescribed substrate. The measured receiver gain, noise figure and image rejection is 37 dB, 4.25 dB and 40 dB respectively. However, it deduced from the experimental results of the two front-end modules that the complex permittivity characteristics of the substrate are altered after the laser ablation process. The effective permittivity alteration phenomenon is further validated through the characterization and comparison of various laser ablated and chemically etched Ka band parallel-coupled band-pass filters. A simple and experimentally verified method is worked out to utilize the laser ablation structuring process on the prescribed substrate. It is anticipated that the proposed method can be applied to other laminated substrates as well with the prescribed manufacturing process. DOI : http://dx.doi.org/10.11591/telkomnika.v12i2.3775
Super-resolution Imaging Realization of Costas Signal Wang Liang; Shang Chao-xuan; He Qiang; Han Zhuang-zhi; Wang Yong-lei
Indonesian Journal of Electrical Engineering and Computer Science Vol 12, No 2: February 2014
Publisher : Institute of Advanced Engineering and Science

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Abstract

Although the ambiguity function of Costas-coded FH (Frequency Hopping) signal has a thumbtack nature, its resolution in range and velocity domain is constraint by the bandwidth and time duration also. If one target is much stronger than the others in multi-targets detection environment, the sidelobes pedestal will make possible masking via the traditional stretch signal processing. Based on the diffraction model of radar target, sparse decomposition and compressed sensing are applied to reconstruct the radar range-velocity profiles with super-resolution. In order to get the super-resolution profiles, a sparse dictionary is constructed based on the Costas echo model, different sparsity measure functions are studied, and the penalizing function method and the Lagrangian multipliers method are introduced to get the optimal result. Some schemes are introduced to get the optimal atom and the differences between these schemes are compared via simulations. DOI : http://dx.doi.org/10.11591/telkomnika.v12i2.3904
Water quality evaluation model based on hybrid PSO-BP neural network Xing Xu; Bingxiang Liu
Indonesian Journal of Electrical Engineering and Computer Science Vol 12, No 2: February 2014
Publisher : Institute of Advanced Engineering and Science

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Abstract

A hybrid neural network algorithm, aims at evaluating water quality, based on particle swarm optimization (PSO) algorithm, which has a keen ability in global search and back propagation (BP) algorithm that has a strong ability in local search. Heuristics has been proposed to optimize the number of neurons in the hidden layer. The comparison with the traditional BP NN shows the advantage of the proposed method with high precision and good correlation. The values of average absolute deviation (AAD), standard deviation error (SDE) and squared correlation coefficient (R2) are 0.0072, 0.0208 and 0.98845, respectively. The results show that the hybrid PSO-BP NN has a good predictal ability of evaluating water quality; it is a practical and efficacious method to evaluate water quality. DOI : http://dx.doi.org/10.11591/telkomnika.v12i2.3190
FFT Analysis on Coupling Effect of Axial and Torsional Vibrations in Circular Cross Section Beam of Steam Turbine Generators Xiang Xu
Indonesian Journal of Electrical Engineering and Computer Science Vol 12, No 2: February 2014
Publisher : Institute of Advanced Engineering and Science

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Abstract

This paper presents a novel method to nonlinearly investigate the dynamics of the coupled axial and torsional vibrations in the circular cross section beam of the steam turbine generator using the FFT analysis. Firstly, the coupled axial and torsional vibrations of a beam are proved by equivalent law of shearing stress and different boundary conditions. Then, a nonlinear mathematical model of the coupled axial and torsional vibrations is established by the Galerkin method. Lastly, the fast Fourier transform (FFT) is employed to investigate the coupled effect of the beam vibration. A practical calculation example is calculated numerically and the coupled mechanism of the beam’s axial and torsional vibrations is analyzed in detail. The analysis results show that the frequencies of the coupled response would be existed in some special orders and the coupled response frequencies are smaller than the single vibration. Since for the first time the coupled mechanism of the beam’s axial and torsional vibrations is theoretically analyzed, the findings in this work may provide directive reference for practical engineering problems in design of steam turbine generators. DOI : http://dx.doi.org/10.11591/telkomnika.v12i2.4379 

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