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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 :
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Articles 103 Documents
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Search results for , issue "Vol 12, No 5: May 2014" : 103 Documents clear
An Improved Method of SVM-BPSO Feature Selection Based on Cloud Model Jizhen Li; Xiangru Meng; Jing Wen; You Xu
Indonesian Journal of Electrical Engineering and Computer Science Vol 12, No 5: May 2014
Publisher : Institute of Advanced Engineering and Science

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Abstract

An improved method of SVM-BPSO feature selection based on cloud model is proposed to solve the local deadlock problem of the current SVM-BPSO methods. This method uses the Wrapper evaluation strategy, making SVM as the classifier, BPSO algorithm is adopted to conduct a whole search in the feature space to seek out the optimal feature subset from the classification results of SVM. The inertia weight of BPSO algorithm is adjusted by Cloud Model intelligently and self-adaptively, the whole and local searching capability of SVM-BPSO feature selection algorithm get balanced, and prevent it into the local deadlock effectively. Analysis on simulations shows that the improved method of SVM-BPSO feature selection based on Cloud Model can be able to dap out from the local optimum with a faster convergence rate, and shows good experimental effect. DOI : http://dx.doi.org/10.11591/telkomnika.v12i5.5005
An Adaptive All-odd transformation Watermark Scheme Qiaomei Ma; Lijun Wu; Jianhong Du; Gouxi Chen; Qiuxiang Yang
Indonesian Journal of Electrical Engineering and Computer Science Vol 12, No 5: May 2014
Publisher : Institute of Advanced Engineering and Science

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Abstract

Combining discrete wavelet transform, human visual system, chaotic map and odd-even quantization, a novel watermarking scheme for 2D images is proposed in this paper. Encrypted watermarking and identity information are imperceptibly embedded in 2D images according to this scheme. For improving the accuracy of just noticeable distortion and enhance robustness of algorithm, the model adaptively adjusts the threshold intensity by adding weighting factor and strengthening the brightness sensitivity calculation method of just noticeable distortion. The bijection relationship is constructed between the image coefficients and watermarking bits by the way of all-odd transformation to the just noticeable distortion, so the scheme realizes blind extraction of watermark. The experimental results and analysis show that the proposed scheme can resist intentional or unintentional variety of attacks and have superiority comparing with existing schemes. DOI : http://dx.doi.org/10.11591/telkomnika.v12i5.4228
Visualization Analysis of Dynamic Evolution of the Theme in Improvisation Studies Peng-bin Gao; Weiwei Wu; Bo Yu
Indonesian Journal of Electrical Engineering and Computer Science Vol 12, No 5: May 2014
Publisher : Institute of Advanced Engineering and Science

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Abstract

The field of improvisation is composed of a multiplicity of topics leading to a vast array of management literature. However, the research does not provide a chronological picture of the topics it addresses, making it difficult to develop an overview of the evolution and trends in the literature. To address this issue, co-word analysis was employed to reveal patterns and trends in the improvisation field by measuring the association strengths of keywords of relevant documents. Data were collected from Web of Knowledge database for the period 1997-2012. Using the co-occurrence matrix of keywords, the results of multivariate statistical techniques show that the improvisation research involves many fields including innovation, strategy, learning, change, leadership, metaphor, entrepreneurship, capability.In order to trace the dymamic changes of the improvisation field, the whole period was further separated into three periods: 1997-2002, 2003-2007 and 2008-2012. The strategic diagram and social network analysis was used to trace the dynamic changes of the improvisation research, and results show that improvisation field has some established research themes and it also changes rapidly to embrace new themes. DOI : http://dx.doi.org/10.11591/telkomnika.v12i5.4927
Cost-Emission Scheduling under Uncertainty in a Smart Grid with Wind Power and PHEVs Zhang Xiaohua; Xie Jun; Li Zhenkun
Indonesian Journal of Electrical Engineering and Computer Science Vol 12, No 5: May 2014
Publisher : Institute of Advanced Engineering and Science

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Abstract

The rapid development of plug-in electric vehicles (PHEVs) and wind power brings new challenges to power system security and economic operation. Traditional deterministic models fail to capture their extra characteristics. In this paper, PHEVs, wind power and thermal units are studied. The scheduling model with PHEVs and wind power is more complex, which minimizes the cost-emission while considering the uncertainty of wind power and load, the smart charging/discharging of PHEVs, the coordination of wind power and PHEVs. The multi-scenario simulation is presented in the random variable discretization. Numbers of representative scenarios is chosen, so that the original objective of the smart grid is within an acceptable level. Then the multi-agent system(MAS)technology is proposed to divided a day is into 24 time intervals, and each time interval is managed by a work agent to produce a solution set for the time interval. The wind power, PHEVs and thermal units are coordinated by the work agent. 24 work agents are managed a coordination agent that would coordinate the solutions of the work agents. Finally, a smart grid of 10 thermal units, a wind farm and PHEVs are used to demonstrate the effective of the proposed model. The results show that the smart grid can use the wind power and PHEVs most effectively, can greatly cut the operation cost and carbon emission. By the tradeoff between the weight factor of cost and emission, the balance of cost and emission can reach. DOI : http://dx.doi.org/10.11591/telkomnika.v12i5.4953
Acoustic Emission Source Identification Based on Pattern Recognition Method Zhigang Feng; Jiu Yao
Indonesian Journal of Electrical Engineering and Computer Science Vol 12, No 5: May 2014
Publisher : Institute of Advanced Engineering and Science

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Abstract

A new pattern recognition method based on harmonic wavelet packet (HWPT) and hierarchy support vector machine (H-SVM) is proposed to solve the fatigue damage identification problem of helicopter component. In this approach, HWPT is used to extract the energy feature of acoustic emission (AE) signals on different frequency bands and to reduce the dimensionality of original data features. The H-SVM classifier is used to identify the AE source type. A subset of the experimental data for known AE source type is used to train the H-SVM classifier, the remaining set of data is used to test the H-SVM classifier. Also, the pressure off experiment on specimen of carbon fiber materials is investigated. The results indicate that the proposed approach can implement AE source type identification effectively, and has better performance on computational efficiency and identification accuracy than wavelet packet (WPT) feature extraction and RBF neural network classification. DOI : http://dx.doi.org/10.11591/telkomnika.v12i5.3587
High Voltage Security System Design and Testing of Electric Car Peng Hailan; Jiang Zhilong
Indonesian Journal of Electrical Engineering and Computer Science Vol 12, No 5: May 2014
Publisher : Institute of Advanced Engineering and Science

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Abstract

Safety design of high voltage part is the foundation of the whole automobile design; it is based on safety design requirements of the electric car, and the security function of hardware. The design the different functions of hardware modules are presented, through circuit principle diagram layout of PCB, and circuit board is made, the systems hardware test board is design according to the functional test of the system. Test results show that relative errors between the measurement of insulation resistance value of the safety system and the theoretical value is only 0.3%, thus the rationality of the design calculation model of the insulation resistance is verified. The response times of DC (direct current) contactor are higher than the national standard requirements, so the system security design meets the design requirements. DOI : http://dx.doi.org/10.11591/telkomnika.v12i5.4899
Research on Power Load Modeling Based on Improved Perturbed Method Guoping Shi; Jun Liang; Xiangsheng Liu
Indonesian Journal of Electrical Engineering and Computer Science Vol 12, No 5: May 2014
Publisher : Institute of Advanced Engineering and Science

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Abstract

This paper introduces a conventional synthesis power load model considering distribution network in PSASP, through analyzing the model structure and achieving process, proposes a power load model parameter identification method based on improved perturbed method. The paper gives parameters identification method of complete synthesis load model, including reactive power compensator parameters. The parameters identification method combines parameter identification process with sensitivity analyzing process together, not only can get model parameters but also can obtain the sensitivity of all parameters, which saves computing time and reduces the amount of calculation, the final simulation results prove the method is effective and feasible. DOI : http://dx.doi.org/10.11591/telkomnika.v12i5.5113
Application of Distributed Fiber Temperature Detection Technology in the Shaft Freezing Restoration Project Zheng Xiao Liang; Hu Ye-lin; Shen Hua-jun; Xie Hong-zhi; Dou An-feng; Yu Jin-chang
Indonesian Journal of Electrical Engineering and Computer Science Vol 12, No 5: May 2014
Publisher : Institute of Advanced Engineering and Science

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Abstract

According to the particularity of the restoration project of using freezing method to conduct shaft-forming well wall, the monitoring of the conventional hydrological hole and thermometer hole, new means of detection are added, and distributed fiber temperature detection technology is used to check the temperature of each longitudinal freezer. The principle, composition, detection method and temperature measuring optical cable structure of the distributed fiber temperature detection system are introduced in detail. Field measured data is given, which has large data size and can reflect the actual development status of freezing wall comprehensively and intuitively compared with the traditional thermometer hole data. Data analysis provides the basis for guiding the freeze construction being carried out safely and smoothly. The structure of system is simple and flexible, and the detection method has a certain promotional value. DOI : http://dx.doi.org/10.11591/telkomnika.v12i5.4436
Detecting Community and Topic Co-Evolution in Social Networks Juan Bi; Zhiguang Qin; Jia Huang
Indonesian Journal of Electrical Engineering and Computer Science Vol 12, No 5: May 2014
Publisher : Institute of Advanced Engineering and Science

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Abstract

In this paper we study how to discover the co-evolution of topics and communities over time in dynamic social networks. We present a topic model-based approach that automatically captures the dynamic features of communities and topics evolution. Our model can be viewed as an extension of the LDA model with the key addition that it can not only detect communities and topics simultaneously but also work in an online fashion. Instead of modeling communities and topics in statistical manner, the proposed model can simulate the user’s interests drifting at different time epochs by taking into consideration the temporal information implied in the data, and observe how the community structure changes over time with the evolution of topics. Experiments on real-world data set have proved the ability of this model in discovering well-connected and topically meaningful communities and the co-evolution pattern of topics and communities. DOI : http://dx.doi.org/10.11591/telkomnika.v12i5.4389 
A New Adaptive Threshold Image-Denoising Method Based on Edge Detection Binwen Huang; Yuan Jiao
Indonesian Journal of Electrical Engineering and Computer Science Vol 12, No 5: May 2014
Publisher : Institute of Advanced Engineering and Science

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Abstract

In image processing, removal of noise without blurring the image edges is a difficult problem. Aiming at orthogonal wavelet transform and traditional threshold’s shortage, a new wavelet packet transform adaptive threshold image de-noising method which is based on edge detection is proposed. By edge detection method, the wavelet packet coefficients corresponding to edge which is detected and other non-edge wavelet packet coefficients are treated by different threshold. Using the relativity among wavelet packet coefficients and neighbor dependency relation, at the same time, adopting the new variance neighbor estimate method and then the adaptive threshold is produced. From the experiment result, we see that compared with traditional methods, this method can not only effectively eliminate noise, but can also well keep original image’s information and the quality after image de-noising is very well. DOI : http://dx.doi.org/10.11591/telkomnika.v12i5.3533

Page 2 of 11 | Total Record : 103

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