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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 50 Documents
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Search results for , issue "Vol 10, No 6: October 2012" : 50 Documents clear
Hierarchical Agglomeration Community Detection Algorithm via Community Similarity Measures Mingwei Leng; Jinjin Wang; Pengfei Wang; Xiaoyun Chen
Indonesian Journal of Electrical Engineering and Computer Science Vol 10, No 6: October 2012
Publisher : Institute of Advanced Engineering and Science

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Abstract

Community detection is an important method for analyzing the community structure of real-world networks. Most of the hierarchical agglomeration community detection algorithms are the variations of NM algorithm. In this contribution, we present a new hierarchical agglomeration community detection algorithm, called Community Merging via Community Similarity Measures (CMCSM). The proposed algorithm encompasses three components. It first repeatedly joins communities by using single-node community measure and combination rule. Then it adjusts a few nodes by SHARC which is an advanced label propagation algorithm. Finally, it merges communities by using community similarity measure. Four of most important features of CMCSM are that (1) it requires only a single parameter which is the number of community count, (2) it can prevent single-node communities and monster communities from being created, (3) it is well suited for a wide range of networks and (4) its computation is not expensive. The algorithm CMCSM is demonstrated with real-world and artificial networks, the experiment shows that CMCSM has a more efficient and accurate result of community detection compared with some hierarchical algorithms recently proposed. DOI: http://dx.doi.org/10.11591/telkomnika.v10i6.1430
Research on Life Signals Detection Based on Higher Order Statistics Jian-Jun Li
Indonesian Journal of Electrical Engineering and Computer Science Vol 10, No 6: October 2012
Publisher : Institute of Advanced Engineering and Science

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Abstract

The life signals are built on harmonic mode for their low frequency, quasi-periodicity, low SNR, and the easy submerged in strong clutter noise. The method for detecting life signal based on adaptive filter and high order statistics is presented, in which neither the Gaussian supposition of the observed signal, nor a prior information about the waveform and arrival time of the observed signal is necessary. The principle of method is to  separate the spectrum of input signal into many narrow frequency bands, whose Sub-band signal  is followed by a short-time estimation of higher-order statistics so as to suppress Gaussian noises. Simulated results show that the method can effectively detect life signals from noise with good convergence speed and stability, and greatly improve the signal quality with respect to LMS method. DOI: http://dx.doi.org/10.11591/telkomnika.v10i6.1597 
Improved Structure and Three-dimensional Numerical Analysis of Diesel Nozzle LI Ming-hai; YIN Hai-tin
Indonesian Journal of Electrical Engineering and Computer Science Vol 10, No 6: October 2012
Publisher : Institute of Advanced Engineering and Science

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Abstract

First the study shows flow area can enlarge and turbulence generated by energy loss can reduce as the fuel injection hole chamfering，when spray nozzles are designed in the cone by analyzing and calculating the parameters of a high-power diesel. Then the investigation is created that it is about the pressure maps, velocity maps and discharge maps after the models are imported into the fluid software. The results about the numerical simulation test and verify the validity of the improved structure providing a reference for domestic peers. DOI: http://dx.doi.org/10.11591/telkomnika.v10i6.1401
Incentive Mechanism Algorithm for P2P File System in Campus Networks Fanpeng Yu; Sidong Zhang; Xin Zhou
Indonesian Journal of Electrical Engineering and Computer Science Vol 10, No 6: October 2012
Publisher : Institute of Advanced Engineering and Science

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Abstract

P2P file sharing system in campus networks has attracted most of campus users, which can share many useful study and software files and entertainment resource. How to solve “Free Riders" and "Tragedy of Common" widespread problems has become the crucial for P2P system in campus network. In this paper, an incentive mechanism algorithm IMA based on contribution value has been proposed. According to the characteristics of file sharing system in campus network, the rules of the IMA are quantitative for sharing factors such as sharing files size and sharing rate, sharing time and files types. Experimental results and analysis show that the IMA for P2P system can effectively motivate user to share its resource and decease the selfish users, which can take the fairness and efficiency into account in P2P file system. DOI: http://dx.doi.org/10.11591/telkomnika.v10i6.1397
Theoretical Study on Time Delay of Slow Light by Remodeling SBS Gain and Absorption Spectrum Qiliang Li; Yong Zhang; Ziyang Wang; Ran Zeng; Tianshu Wang; Miao Hu
Indonesian Journal of Electrical Engineering and Computer Science Vol 10, No 6: October 2012
Publisher : Institute of Advanced Engineering and Science

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Abstract

In this paper, we perform a theoretical study of processes that demonstrates additional time delay obtained by remodeling Brillouin gain spectrum, and we also study the main influence factors on pulse time delay and broadening, as well as analyze the ways which increases the delay, and further suppresses pulse broadening. The results show that by remodeling Brillouin gain spectrum, one obtains 25% delay improvement over the single intrinsic Brillouin gain spectrum; by deriving the expression of broadening factor, one finds that the increase of intrinsic SBS resonance linewidth leads to the decrease of the broadening quantity which corresponds to the maximum delay. Moreover, the increase of the peak power of absorption spectrum further leads to an increase of pulse delay. When the normalized frequency shift is below a certain value, probe pulse can be compressed; When the second-order gain is positive, pulse will be compressed; when the second-order gain is negative, pulse will become broad. DOI: http://dx.doi.org/10.11591/telkomnika.v10i6.1543
Study on the Linearly Range of S-Shaped MEMS Planar Micro-spring Guozhong Li; Li Sui; Gengchen Shi
Indonesian Journal of Electrical Engineering and Computer Science Vol 10, No 6: October 2012
Publisher : Institute of Advanced Engineering and Science

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Abstract

For the lack of formula of linear range for S-shaped MEMS planar micro-spring, this paper establishes physical and mathematical model and analysis the material stress-strain angle. The formula is deduced by calculating the strain and rotation of the basic unit of micro-spring tension. Compared with the results of the tests on micro-spring which produced by UV-LIGA process, the formula results is in about 10% higher, providing theoretical guidance for the design and application of S-shaped MEMS planar micro-spring in engineering practice. DOI: http://dx.doi.org/10.11591/telkomnika.v10i6.1427
Component Content Soft-Sensor of SVM Based on Ions Color Characteristics Lu Rongxiu; Yang Hui; Zhang Kunpeng
Indonesian Journal of Electrical Engineering and Computer Science Vol 10, No 6: October 2012
Publisher : Institute of Advanced Engineering and Science

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Abstract

In consideration of different characteristic colors of Ions in the P507-HCL Pr/Nd extraction separation system, ions color image feature H, S, I that closely related to the element component contents are extracted by using image processing method. Principal Component Analysis algorithm is employed to determine statistics mean of H, S, I which has the stronger correlation with element component content and the auxiliary variables are obtained. With the algorithm of support vector machine, a component contents soft-sensor model in Pr/Nd extraction process is established. Finally, simulations and tests verify the rationality and feasibility of the proposed method. The research results provide theoretical foundation for the online measurement of the component content in Pr/Nd countercurrent extraction separation process. DOI: http://dx.doi.org/10.11591/telkomnika.v10i6.1418
Ultrasonic Wind Velocity Measurement Based on Phase Discrimination Technique Chunyu Yu; Chao Guo; Jia-yi Liang; Tong Wang
Indonesian Journal of Electrical Engineering and Computer Science Vol 10, No 6: October 2012
Publisher : Institute of Advanced Engineering and Science

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Abstract

According to the shortcomings of the existing ultrasonic wind velocity measurement device, for instance, complexity of circuit and difficulty of signal processing, a new ultrasonic wind velocity measurement is put forward based on phase discrimination and a new sensor configuration as well. Thus, a system model is built. Firstly, an equilateral triangle should be constituted by an ultrasonic emission sensor and two ultrasonic receiving sensors. Then by high-precision phase discrimination circuit, the lag between the ultrasonic which is received by two ultrasonic receiving sensors during the traveling time in the upwind and downwind is converted to the phase difference. After that, the wind velocity is measured. Besides, a mathematical model is established among the wind velocity, the ultrasonic velocity, and the structural parameters with ambient temperature. The factors which influence the precision of the wind velocity measurement are analyzed and the solutions are given as well. The experimental results show that in view of the phase discrimination technology, the system has a good numerical stability and the resolution is one order magnitude better than that of the cup anemometer.  DOI:http://dx.doi.org/10.11591/telkomnika.v10i6.1443
Coal Calorific Value Prediction Based on Projection Pursuit Principle JING Yuan; FU Zhongguang; QI Minfang
Indonesian Journal of Electrical Engineering and Computer Science Vol 10, No 6: October 2012
Publisher : Institute of Advanced Engineering and Science

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Abstract

The calorific value of coal is an important factor for the economic operation of coal-fired power plant. However, calorific value is tremendous difference between the different coal, and even if coal is from the same mine. Restricted by the coal market, most of coal fired power plants can not burn the designed-coal by now in China. The properties of coal as received are changing so frequently that pulverized coal firing is always with the unexpected condition. Therefore, the researches on the prediction of calorific value of coal have a profound significance for the economic operation of power plants. Aiming at the problem of uncertainty of coal calorific value, establish a soft measurement model for calorific value of coal based on projection pursuit principle combined with genetic algorithm to optimize parameters, and support vector machine algorithm. It is shown by an example that the model has a stronger objectivity, effective and feasible for avoiding the disadvantage of the artificially decided weights of feature indexes. The model could provide a good guidance for the calculation of the coal calorific value and optimization operation of coal-fired power plants. DOI: http://dx.doi.org/10.11591/telkomnika.v10i6.1414 
Analysis of Z-axis rigid of PCB CNC drilling machines Liang-jin Cai; Chang-tao Cai
Indonesian Journal of Electrical Engineering and Computer Science Vol 10, No 6: October 2012
Publisher : Institute of Advanced Engineering and Science

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Abstract

This article for the printed circuit board (PCB) CNC drilling machine dynamic character and rigidity analysis of Z-axis, With ADAMS motion simulation of the Z-axis program, come to the bit offset of the rig during the drilling process in the X-axis and Y-axis direction, and then use the quadratic elements of the completed prototype data test, the measured data and simulation data compare validation to identify the impact of the motion parameters of accuracy of ultra-high-speed electric spindle drilling. Using ANSYS on the overall structure (in particular, the structure of Z-axis) to optimize the structure analysis, the optimal structural parameters. This article both specific theoretical analysis, but also the experimental verification, through theoretical analysis and experimental validation of the Z-axis structure play an important role to improve the ultra-high-speed electric spindle dynamic accuracy and rigidity in the drilling process. DOI: http://dx.doi.org/10.11591/telkomnika.v10i6.1421

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