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23,598 Article Results

Electromagnetic Vector Sensor array parameter estimation method

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2300
Lanxiang Zhu , Yaowu Shi , Yiran Shi , Life Deng , Hongwei Shi
Joint estimation method for DOA and polarization parameters of single electromagnetic vector sensor is mostly concerned in radar signal processing now. This paper presents a new algorithm which uses the cyclostationary property of signal. It gets the estimation of DOA and polarization parameters from the noise subspace with minimum norm method. This method can reduce the estimate error of noise subspace vector. At the same time, it is immune to the additional stationary noise of any distribution and interference signals with different cyclic frequencies. Method has been tested by computer simulation and the test result is show in the paper. DOI: http://dx.doi.org/10.11591/telkomnika.v11i5.2562
Volume: 11
Issue: 5
Page: 2860-2868
Publish at: 2013-05-01

Sequence Phase Analysis of Phased Rectifier

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2236
Chen Zhong-Xiao , Li Yan-Fang , Zhang Li-Guang , Chen Xing-Yu
At present, three-phase bridge type full controlled is the most widely applied in all kinds of rectifier circuit. To guarantee the normal work of the phase control circuit, it is the most important thing that should be according to the size of the triggering angle at the right moment to the thyristor trigger of the circuit on effective puls. Nature commutation point is the earliest time of the thyristor trigger conduction, it is the starting point of thyristor trigger calculation angle, if want to change the size of the thyristor can only be based on this increase. It is difficult that to find a natural commutation point of the rectifier circuit. Find nature commutation point can be analyzed corresponding thyristor turn-on. But generally find natural commutation point will be lag behind, lead to trigger angle lags behind, according to this problem can make anyone phase voltage delay after zero, so natural commutation point can make the output voltage to achieve maximum. In fact, the above process is to realize sequence analysis and sequence adaptive. DOI: http://dx.doi.org/10.11591/telkomnika.v11i5.2460
Volume: 11
Issue: 5
Page: 2359-2364
Publish at: 2013-05-01

A Two-hop Collaborative Localization Algorithm for Wireless Sensor Networks

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2247
Shaoping Zhang , Hong Pei
Localization technology is one of the key supporting technologies in wireless sensor networks. In this paper, a two-hop collaborative multilateral localization algorithm is proposed to localization issues for wireless sensor networks. The algorithm applies anchor nodes within two hops to localize unknown nodes, and uses the minimum range error estimation method to compute coordinates of the unknown nodes. If an unknown node can not be localized through two-hop anchor nodes, it is localized by anchor nodes and localized nodes within two hops through auxiliary iterative localization method. Simulation results show that the localization accuracy of this algorithm is very good, even in larger range errors. DOI: http://dx.doi.org/10.11591/telkomnika.v11i5.2471
Volume: 11
Issue: 5
Page: 2432-2441
Publish at: 2013-05-01

The Self-Adaptive Fuzzy PID Controller in Actuator Simulated Loading System

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2270
Chuanhui Zhang , Xiaodong Song
This paper analyzes the structure principle of the actuator simulated loading system with variable stiffness, and establishes the simplified model. What’s more, it also does a research on the application of the self-adaptive tuning of fuzzy PID(Proportion Integration Differentiation) in actuator simulated loading system with variable stiffness. Because the loading system is connected with the steering system by a spring rod, there must be strong coupling. Besides, there are also the parametric variations accompanying with the variations of the stiffness. Based on compensation from the feed-forward control on the disturbance brought by the motion of steering engine, the system performance can be improved by using fuzzy adaptive adjusting PID control to make up the changes of system parameter caused by the changes of the stiffness. By combining the fuzzy control with traditional PID control, fuzzy adaptive PID control is able to choose the parameters more properly. DOI: http://dx.doi.org/10.11591/telkomnika.v11i5.2495
Volume: 11
Issue: 5
Page: 2619-2625
Publish at: 2013-05-01

Impulsive Control and Synchronization of Rössler Chaotic System

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2263
Yan Yan , Wang Kaihua , Gui Zhanji
In this paper, synchronization between two Rössler Chaotic Systems with impulsively controlling is established by using the criteria on uniform equi-boundedness and equi-Lagrange stability for impulsive systems. After several theoretical derivations, some simulation results are given to demonstrate our results. DOI: http://dx.doi.org/10.11591/telkomnika.v11i5.2487
Volume: 11
Issue: 5
Page: 2559-2565
Publish at: 2013-05-01

Edge Steganography for Binary Image

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2295
Hongxia Wang , Gouxi Chen , Meng Zhang
In order to improve the steganographic robustness of the algorithm in binary images, suppose an new steganographic method which deals with the edge of the binary image using mathematical morphology and combines F5 encoding method to embedded information. Marginalization and reconstruction on binary image by dilation and erosion operations, and tag blocks that can embed information to. Finally embed secret information using F5 algorithm. Through experiments and analysis it comes out the steganographic robustness of the algorithm can be enhanced, and have a small changes on the carrier image quality after embedding information, and also has a good embedding capacity. DOI: http://dx.doi.org/10.11591/telkomnika.v11i5.2557
Volume: 11
Issue: 5
Page: 2822-2829
Publish at: 2013-05-01

VSGA Method Based Trajectory Planning of a Novel Limb-robot

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2302
Li Liu , Han-lin Yang , Tie-feng Zhang , Ming Pang , Jie Zhao
A new progressive genetic algorithm (PGA) was developed for trajectory planning of a novel limb-robot. The proposed trajectory planning method can be applied to get an optimal joints trajectory from the initial to the end position and orientation. On the basis of the genetic algorithm a new kind of variable structure genetic algorithm (VSGA) is proposed to solve the problem of trajectory planning of the limb-robot in complicate environments. The VSGA changes the original structure by abandoning Elitist Model, expectation selection, reproducing population and changing the probability of crossover and mutation. Experiments results show that the PGA is effective in static environments and the VSGA does well in complicate environments. DOI: http://dx.doi.org/10.11591/telkomnika.v11i5.2564
Volume: 11
Issue: 5
Page: 2879-2887
Publish at: 2013-05-01

Linear Analysis for Performance of Dual Mass Flywheel with Centrifugal Pendulum Vibration Absorbers System

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2238
Guangming Zhao , Zhengfeng Jiang , Lei Chen
In this study we have offered an investigation of DMF-CPVAs setup for isolating torsional vibration from engine. The simplified mathematical model of DMF-CPVAs setup is built based on the linear theory, the performance of the setup is analyzed, and the result shows that using CPVAs on the DMF leads to an advantage of isolation vibration, instead of just damping vibrations at a specific frequency, could dampen vibrations over a range of frequencies. DOI: http://dx.doi.org/10.11591/telkomnika.v11i5.2462
Volume: 11
Issue: 5
Page: 2371-2376
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

A New Approach to Sensor Energy Saving Algorithm

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2254
Peng Zhu , Fei Jia
Wireless sensor network energy saving algorithm is a popular topic in recent researches. This paper proposes a new LEACH based energy saving algorithm to prolong the life of wireless sensor network. In this algorithm, sensors are divided into several static clustering. And each sensor takes turns to act as clustering head. Meanwhile, in order to reduce the network communication flow, the algorithm transports as little control signals as possible. Simulation results show that the algorithm proposed by this article is better than traditional fixed energy saving clustering algorithm in prolonging network’s life cycle. DOI: http://dx.doi.org/10.11591/telkomnika.v11i5.2478
Volume: 11
Issue: 5
Page: 2485-2489
Publish at: 2013-05-01

Research of the Nonlinear System Identification Based on the Volterra RLS Adaptive Filter Algorithm

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2226
Wen Xinling , Chen Yu
This paper mainly research a kind of nonlinear system modeling method based on the  Volterra series RLS adaptive filter algorithm. Through the modeling second order Volterra nonlinear system, and adapting Volterra RLS algorithm to apply in the first order and second order item, under the gaussian noise condition, iterations times is not more than fifty times, the algorithm can realize convergence, which prove the algorithm accuracy. Volterra RLS adaptive filter algorithm can be effectively applied into the mechanical vibration damping and de-noising in active control, which has a broad application prospect. DOI: http://dx.doi.org/10.11591/telkomnika.v11i5.2261
Volume: 11
Issue: 5
Page: 2277-2283
Publish at: 2013-05-01

A Novel Optimization Means of Transfer Efficiency for Resonance Coupled Wireless Power Transfer

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2286
Tan Linlin , Qiang Hao , Huang Xueliang , Cao Weijie , Sun Wenhui
When the transmitting and receiving coils are equivalent with or not significantly smaller than their separation distance between the two coils, the results of numerical simulations for transfer efficiency of system show that the maximum coupling of two coils or maximum transfer efficiency occur with a certain tilt angle between two coils, which means the two coils with parallel on the same axis is not able to obtain the maximum transmission efficiency. In view of this feature of the wireless power transfer system, we propose a novel means to optimize the transfer efficiency by designing rotatable transmitting coils to achieve the appropriate tile angle. The experimental results show that the presented means is efficient and greatly improves the transfer efficiency. DOI: http://dx.doi.org/10.11591/telkomnika.v11i5.2512
Volume: 11
Issue: 5
Page: 2747-2752
Publish at: 2013-05-01

Delay-Dependent Observers for Uncertain Nonlinear Time-Delay Systems

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2242
Dongmei Yan , Youwei Wang , Jiuhong Wei , Dongzhe Li , Lei Chen
This paper is concerned with the observer design problem for a class of discrete-time uncertain nonlinear systems with time-varying delay. The nonlinearities are assumed to satisfy global Lipschitz conditions which appear in both the state and measurement equations. The uncertainties are assumed to be time-varying but norm-bounded. Two Luenberger-like observers are proposed. One is delay observer and the other is delay-free observer. The delay observer which has an internal time delay is applicable when the time delay is known. The delay-free observer which does not use delayed information is especially applicable when the time delay is not known explicitly. Delay-dependent conditions for the existences of these two observers are derived based on Lyapunpv functional approach. Based on these conditions, the observer gains are obtained using the cone complementarity linearization algorithm. Finally, a numerical example is given to illustrate the effectiveness of the proposed method. DOI: http://dx.doi.org/10.11591/telkomnika.v11i5.2466
Volume: 11
Issue: 5
Page: 2394-2401
Publish at: 2013-05-01

Hierarchical Design Method for Micro Device

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2265
Zheng Liu , Hua Chen
Traditional mask-beginning design flow of micro device is unintuitive and fussy for designers. A hierarchical design method and involved key technologies for features mapping procedure are presented. With the feature-based design framework, the model of micro device is organized by various features in different designing stages, which can be converted into each other based on the mapping rules. The feature technology is the foundation of the three-level design flow that provides a more efficient design way. In system level, functional features provide the top level of schematic and functional description. After the functional mapping procedure, on the other hand, parametric design features construct the 3D model of micro device in device level, which is based on Hybird Model representation. By means of constraint features, the corresponding revision rules are applied to the rough model to optimize the original structure. As a result, the model reconstruction algorithm makes benefit for the model revision and constraint features mapping process. Moreover, the formulating description of manufacturing features derivation provides the automatic way for model conversion. DOI: http://dx.doi.org/10.11591/telkomnika.v11i5.2490 
Volume: 11
Issue: 5
Page: 2574-2582
Publish at: 2013-05-01

Venture Capital Industry Index Portfolio Analysis

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2230
Dagang Yang , Xuefeng Wang , Yishi Zhu
This paper using index analysis method, knowledge of venture capital as well as index funds investment ideas, successively set up the Markowitz model and the single index model of index investing. Markowitz model for the calculation of the risk of workload is too big and single-index model although accuracy is slightly lower, but can certainly be very well used in practice. Therefore, We use index invest to invest in Shanghai 10 index securities with the single-index model , and apply lingo software to figure out the venture capital portfolio which have different yields. DOI: http://dx.doi.org/10.11591/telkomnika.v11i5.2454
Volume: 11
Issue: 5
Page: 2309-2314
Publish at: 2013-05-01
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