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23,598 Article Results

Low Cost Quasi Binary Weighting Addition Log-SPA LDPC Decoders

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2280
Po-Hui Yang , Ming-Yu Lin
This paper proposes a new addition method, which can be applied to reduce the hardware cost of LDPC decoders using log-SPA, which traditionally has the best lowest bit error rate (BER) but the highest hardware requirement. The proposed quasi-binary weighting addition can be simply implemented by OR gates. With auxiliary pseudo-carry circuit, the BER performance can reach a fair level. In the log-SPA message-passing path, numeric transform reduction architecture is proposed for further hardware reduction. Synthesized and numerical results show that the new proposed architecture achieved an up to 32% and 18% total hardware reduction, compared with traditional log-SPA decoders, and the simplest sign-min architecture, respectively, with fair BER performance. DOI: http://dx.doi.org/10.11591/telkomnika.v11i5.2505
Volume: 11
Issue: 5
Page: 2699-2709
Publish at: 2013-05-01

Hyper-chaotic LÜ System Simulation Design of Digital Circuit Based on DSP Builder

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2278
Zhang Xiaohong , Zhang Zhiguang
In order to overcome sensitive defects of components deviations and environment defects in analog circuit design, a novel four-dimensional hyperchaotic systems is constructed based on LÜ system. Basic nonlinear dynamics characteristics are analyzed to the new system. By optimizing the design of sampling frequency selection, gain adjustments, parameter configuration etc., the hyperchaotic circuit runs stably while the signal amplitude is reasonably controlled. Curves of the digital chaotic sequence show smooth without jagged shape. The circuit can be applied to other digital realization of chaotic systems with commonality and expandability. Its experimental results fully consistent with phase space structures of the continuous chaotic system, which shows the development of chaotic systems based on FPGA is feasible and practical. DOI: http://dx.doi.org/10.11591/telkomnika.v11i5.2503
Volume: 11
Issue: 5
Page: 2679-2691
Publish at: 2013-05-01

Differential Protection for Distributed Micro-Grid Based on Agent

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2272
ZHOU Bin , YING Li-ming , ZHU Yonggang
The Micro-grid, even though not a replacement of the conventional centralized power transmission grid, plays a very important role in the success of rapid development of renewable energy resources technologies. Due to the facts of decentralization, independence and dynamic of sources within a Micro-grid, a high level automation of protection is a must. Multi-Agent system as a approach to handle distributed system issues has been developed. This paper presents an MAS based differential protection method for distributed micro-grid. The nodes within a micro-grid are divided into primary and backup protection zones. The agents follow predefined rules to take actions to protect the system and isolate the fault when it happens. Furthermore, an algorithm is proposed to achieve high availability in case of Agent itself malfunction. The method is using Matlab for simulation and shows it satisfies relay protection in terms of the selectivity, sensitivity, rapidity and reliability requirements. DOI: http://dx.doi.org/10.11591/telkomnika.v11i5.2497
Volume: 11
Issue: 5
Page: 2634-2640
Publish at: 2013-05-01

Study on the Structrual Parameter Coupling of Articulated Arm Coordinate Measuring Machines

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2250
Guanbin Gao , Jian Lu , Huiping Yang
The articulated arm coordinate measuring machine (AACMM) is a kind of new coordinate measuring device based on non-Cartesian system. The measuring accuracy of the AACMM can be effectively improved by parameter identification. However, some of the structural parameters are coupling (linearly related), so the structural parameters usually cannot be identified correctly. The Jacobian matrix was obtained through differential transformation of the kinematic model of a 6-DOF AACMM. The rank calculation results show that the Jacobian matrix is not full rank, which means some structural parameters are linearly related. Singular value decomposition and the elementary row transform of the Jacobian matrix were carried out to determine the linearly related structural parameters. And two pairs of structural parameters were found to be linearly related, which can’t be identified at the same time. Finally, the linear correlation was applied in the structural parameters identification, and the results show that the linear correlation can make the identification obtain correct structural parameters. DOI: http://dx.doi.org/10.11591/telkomnika.v11i5.2474
Volume: 11
Issue: 5
Page: 2454-2459
Publish at: 2013-05-01

Omni-Directional Impact Micro switch with Extended Holding Time

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2249
Shuangjie Liu , Yongping Hao
The Omni-directional impact MEMS switch was designed and characterized for the purpose of impact sensing. In order to turn on the circle reliably, the connect time should be long enough, the structure of flexible electrode was designed to extend the holding time. The structure consists of electrode A and B, electrode A is the sensing mass simultaneously, the sensing mass is suspended by helix cantilever that is fixed to the pedestal, the outer ring is the electrode B, which is suspended by helix cantilever that is fixed to the outer frame. Between the two electrodes, there is a gap, the gap separates electrode A and B, thereby keeping the switch in the open state. The distortion during the impact process extended the contact time. The dynamics of the switch is simulated, the simulation results show that the response time of the switch is 0.135ms, it is short enough, and the contact time which is also called holding time is about 20, the extended time make the switch turn on more reliably. These results satisfy the required specifications for the ammunition systems. DOI: http://dx.doi.org/10.11591/telkomnika.v11i5.2473
Volume: 11
Issue: 5
Page: 2448-2453
Publish at: 2013-05-01

Voice Collection under Different Spectrum

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2273
Min Li , Yu-duo Wang
According to the short-time Fourier transform theory and principle of digital filtering, this paper established a mathematical model called collection of voice signal collection at different spectrum. The voice signal was a non-stationary process, while the standard Fourier transform only applied to the periodic signal, transient signals or stationary random signal. Therefore, the standard Fourier transform could not be directly used for the speech signal. By controlling the input different types and parameters, this paper analyzed the collected original voice signal spectrum with the use of MATLAB software platform. At the same time, it realized the extraction, recording and playback of the speech signal at different frequencies. Therefore, the waveforms could be displayed obviously on the graphic user interface and voice effect could be more clearly. Meanwhile, the result was verified by the hardware platforms, which consisted of TMS320VC5509A [1] chip and TLV320AIC23 voice chip. The results showed that the extraction of voice signal under different spectrum model was scientific, rational and effective. http://dx.doi.org/10.11591/telkomnika.v11i5.2498 
Volume: 11
Issue: 5
Page: 2641-2647
Publish at: 2013-05-01

A New Multi-tree and Dual Index based Firewall Optimization Algorithm

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2241
Cuixia Ni , Guang Jin , Xianliang Jiang
Using statistical analysis strategy, a large-scale firewall log files is analyzed and two main characteristics, the protocol field and the IP address field, is extracted in this paper. Based on the extracted features and the characteristics of multi-tree and dual-index strategy, we design a better firewall optimization algorithm. Compared with the Stochastic Distribution Multibit-trie (SDMTrie) algorithm, our proposed algorithm can greatly decrease the preprocessing time and improve the searching and filtering process. DOI: http://dx.doi.org/10.11591/telkomnika.v11i5.2465
Volume: 11
Issue: 5
Page: 2387-2393
Publish at: 2013-05-01

Soldiers’ Group Behaviors Simulation Based on Improved MAPRM

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2261
Meng Li , Jia-hong Liang , Shi-lei Li
Soldiers’ group behaviors are a class of flocking behaviors in which a squad of soldiers march forward according to a specified formation and try to keep it when encountering narrow corridors. It has a leading application in deterring the behavior and activities of a potentially hostile crowd and bringing a mob engaged in a riot under control in social stable maintenance. In this paper, we focus on investigating soldier’s group behaviors based on an improved MAPRM algorithm. Firstly, we use MAPRM algorithm to sample configurations from the medial axis of the simulation space. Secondly, in the construction and query phase of MAPRM, clearance information of the space is introduced to local planner and used as heuristic information to A* algorithm which improves the MAPRM algorithm. Thirdly, when the soldiers pass through narrow corridors, their formation transitions are achieved by sampling the desired formation shape. The simulation results show that our approach is effective and feasible. DOI: http://dx.doi.org/10.11591/telkomnika.v11i5.2485
Volume: 11
Issue: 5
Page: 2545-2552
Publish at: 2013-05-01

Efficient Train Driver Drowsiness Detection on Machine Vision Algorithms

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2264
Zhui Lin , Lide Wang , Jieqiong Zhou , Liyuan Liu
In order to give a warning to the drowsy driver, this paper proposes a new Fatigue Driving Detection Algorithm. AdaBoost algorithm is applied to fast detect and track human faces, and the algorithm is implemented in FPGA; differential template-based multi-algorithms are used to localize human eyes and recognize eye states; PERCLOS algorithm is adopted to analyze and determine whether a person is fatigue. Test is implemented based on DM368 add FPGA platform ,and confirms that the algorithm used in the paper can quickly and accurately locate the face and the human eye, and determine the status of the driver's fatigue. Experimental results show that the algorithm has high recognition accuracy and robust performance under real train driving environment, even in head rotation, eye movements and wearing glasses was the case. DOI: http://dx.doi.org/10.11591/telkomnika.v11i5.2488
Volume: 11
Issue: 5
Page: 2566-2573
Publish at: 2013-05-01

Whirlwind Rolling Process of Slender Shaft

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2293
Zhang Hong , Deng ZhiPing , Jin Long , Long Jun , Zhang Zhengyi
In order to solve the problem of slender shaft which is easy bended and deformed for its big slenderness ration and poor rigidity, the method of whirlwind rolling with Tri-tools is designed. This paper introduces the principle and the process of stress analysis. With the help of ABAQUS finite element simulation software, the 3D model of whirling rolling is established. The rolling process is simulated by the software and summarizes the influence of quality factors during the whirlwind rolling process. DOI: http://dx.doi.org/10.11591/telkomnika.v11i5.2554
Volume: 11
Issue: 5
Page: 2810-2815
Publish at: 2013-05-01

Real Time Break Point Detection Technique (RBPD) in Computer Mouse Trajectory

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2281
Seyed Yashar Banihashem , Nor Azan Mat Zin , Noor Faezah Mohd Yatim , Norlinah Mohamed Ibrahim
This paper presents a new technique for detecting break points in computer mouse trajectories called Real time Break Point Detection (RBPD). The mouse trajectory from motor-disabled people contains a lot of break points. RBPD can detect these break points by adapting to the user’s tremor level. To test the effectiveness of this new technique, an experimental study involving five participants suffering from Parkinson’s disease (PD) was conducted. The test results showed that RBPD technique is effectiveness in detecting break points. DOI: http://dx.doi.org/10.11591/telkomnika.v11i5.2507
Volume: 11
Issue: 5
Page: 2710-2715
Publish at: 2013-05-01

Fuzzy Dynamic Scheduling of Multi-loop NCS

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2229
Fang He , Jiajia Pang , Qiang Wang , Zhijie Zhang
There are more problems of network data transmission in multi-loop NCS than in single loop NCS. It maybe lead to that one or more of closed-loop systems become unstable in multi-loop NCS. In order to solve this problem, a novel algorithm of fuzzy dynamic scheduling for multi-loop NCS is put forward in this paper. Firstly, the requirement of the sampling period of NCS is discussed. The necessity of dynamic scheduling for multi-loop NCS is analyzed. And then, the algorithm of fuzzy dynamic scheduling for multi-loop NCS is proposed. The idea is described form three parts.The principle of fuzzy dynamic scheduling is analyzed. The fuzzy controller is designed. The fuzzy dynamic scheduler is constructed. Finally, the simulation model of a multi-loop NCS with fuzzy dynamic scheduler is set up using TrueTime software. The relevant analysis of simulation is given. The result of study can prove that the performance of each closed control loop based on the same network platform is improved by adding fuzzy dynamic scheduler in the multi-loop NCS. DOI: http://dx.doi.org/10.11591/telkomnika.v11i5.2453
Volume: 11
Issue: 5
Page: 2301-2308
Publish at: 2013-05-01

Bi-Level Multi-criteria Multiple Constraint Level Optimization MODELS and Its Application

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2296
Lei Zhao , Liehui Zhang , Yihua Zhong , Yilin Wang
Because oil field development system is a large hierarchical and uncertain system, this paper uses the theory of bi-level programming and multi-criteria multiple constraint level  to formulate a new oilfield measure structural optimization model which is bi-level multiple objectives and multiple constraint level nonlinear programming, and present a new method to solve the bi-level programming whose lower is multiple objectives nonlinear programming, whose upper is linear programming. The result of this model not only may feed back to the comprehensive information of measures output distribution optimization to decision-makers as a whole, but also can provide decision makers oil field exploitation contingency planning to deal with changed resource constraint level. The case study shows that the result fitting calculation by the model is coincide with the historical data of oil field, the model is correct and effective. Moreover this research may provide a reliable new method for oil field development optimal decision-making. DOI: http://dx.doi.org/10.11591/telkomnika.v11i5.2558
Volume: 11
Issue: 5
Page: 2830-2837
Publish at: 2013-05-01

Direction Identification System of Garlic Clove Based on Machine Vision

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2232
Gao Chi , Gao Hui
In order to fulfill the requirements of seeding direction of garlic cloves, the paper proposed a research method of garlic clove direction identification based on machine vision, it expounded the theory of garlic clove direction identification, stated the arithmetic of it, designed the direction identification device of it, then developed the control system of garlic clove direction identification based on machine vision, at last tested the garlic clove direction identification, and the result of the experiment certificated that the rate of garlic clove direction identification could reach to more than 97%, and it demonstrated that the research is of high feasibility and technological values. DOI: http://dx.doi.org/10.11591/telkomnika.v11i5.2456
Volume: 11
Issue: 5
Page: 2323-2329
Publish at: 2013-05-01

The Research on Telemetry Modulation System

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2234
Wu Guo-Hui , Dai Ji-Yang , Chu Bao-Jun
To develop the effective aerospace telemetry communication system, for aerospace telemetry communication requirements high-speed, high bandwidth, high efficiency and low interference, puts forward the C-WQPSK（C-W Quadrate Phase- Shift Keying）modulation method. This method based on direct carrier QPSK, didn’t consider baseband pulse signal, and redesigned the modulating waveform, its phase angle jump and jump to change duration time all can be changed. Also it gives the C-WQPSK performance and theory analysis, and with QPSK, FQPSK the performance comparison, Through the MATLAB simulation experiment, verify this modulation method is correctness and effectiveness. DOI: http://dx.doi.org/10.11591/telkomnika.v11i5.2458
Volume: 11
Issue: 5
Page: 2342-2350
Publish at: 2013-05-01
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