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23,675 Article Results

Scaling Behavior and Phase Change in Complex Network

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2837
Wei Cheng , Tanzhen Hua , Guiran Chang
Scaling behavior is a extremely typical phenomenon in complex system research, as well as it can act that many Macro indicators in system or distribution function of some variables meet exactly power-law behavior, which possesses different kinds of Exponents. In this article, according to Phase Change concept in Physics, it is researched that the nature in critical state of complex network with Seepage model, and it is totally stated that the basic reason of Self-similar behavior, Fractal behavior, and so on, and also Phase Change in complex network in critical state of complex network in accord with power-law distribution.  DOI: http://dx.doi.org/10.11591/telkomnika.v11i11.3529
Volume: 11
Issue: 11
Page: 6787-6793
Publish at: 2013-11-01

DC Power System of Electric Vehicle

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2819
Zhang Liwei , Wang Xiao , Zhang Yujin
In recent years, environmental and energy problem has become one of the world's hot spot problems. Today, the road cars not only consume a lot of oil resource, but also cause serious pollution to human survival environment. Therefore, to save energy and protect environment, a green environmental friendly electric car instead of fuel car will be needed for sustainable development of the society. Electric vehicle has no pollution, low noise, high efficiency, diversification, simple structure and convenient maintaining; the development of green cleaning electric vehicle is the trend, and the inevitable choice. The power supply system of electric vehicle can be divided into three parts, the battery charging system, motor drive system and dc load power supply system. This paper mainly studies the dc load power supply system. Main function is to convert the high-voltage of the battery in the electric vehicle into low voltage output, provide the power supply for the low voltage dc load, including the car safety system, windshield wiper system, audio system. On the basis of the analysis of the parameters, this article designs the converter, sets up the principle prototype, analyzes the experimental results and finally makes conclusion. The vehicle power supply is green, environment friendly, high-efficiency, digital and intelligent.  DOI: http://dx.doi.org/10.11591/telkomnika.v11i11.3511
Volume: 11
Issue: 11
Page: 6651-6656
Publish at: 2013-11-01

An Improved Apriori Algorithm for Association Rules

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2801
Xingli Liu , Huali Liu
According Apriori algorithm characteristic achieve its improvement and apply it to the knowledge correlation of the curriculum in sumulation experiment. Firstly, it is mainly by simplifying the binary storage method to change data in the database, and then to get the largest frequent itemsets.The experiment results showed that the improved algorithm obviously improve the efficiency ;secondly ,establish a new database to simulate applied experiment ,consisted of student achievement of various knowledge points in the computer programming course,and then using this optimized algorithm to found the course knowledge frequent itemsets in a database, which is closely interrelated knowledge points mainly by setting up different minimum support value to get various frequent itemsets .According to these frequent itemsets of the course it can be applied to reestablish a new course knowledge system to further improve the teaching quality, this method can also be achieved the knowledge system reform of other course or course group.  DOI: http://dx.doi.org/10.11591/telkomnika.v11i11.3491 
Volume: 11
Issue: 11
Page: 6521-6526
Publish at: 2013-11-01

A Modified Conjugate Gradient Method for Unconstrained Optimization

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2781
Can Li
Conjugate gradient methods are an important class of methods for solving unconstrained optimization problems, especially for large-scale problems. Recently, they have been much studied. In this paper, we further study the conjugate gradient method for unconstrained optimization. We focus our attention to the descent conjugate gradient method. This paper presents a modified conjugate gradient method. An interesting feature of the presented method is that the direction is always a descent direction for the objective function. Moreover, the property is independent of the line search used. Under mild conditions, we prove that the modified conjugate gradient method with Armijo-type line search is globally convergent. We also present some numerical results to show the efficiency of the proposed method. DOI:  http://dx.doi.org/10.11591/telkomnika.v11i11.2894 
Volume: 11
Issue: 11
Page: 6373-6380
Publish at: 2013-11-01

Fuzzy PID Control Method for Internet-based Tele-operation Manipulators System

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2782
Wei Gao , Miaolei Zhou
Trajectory tracking control problem for internet-based tele-operation system is researched in this paper. The control structure of master and slave tele-operation manipulators adapts bilateral servo control architecture with force deviation feedback. The simulation model of three degrees of freedom (3-DOF) manipulator is presented. In order to ensure the synchronization of positions of the master and slave manipulators, a fuzzy PID control method is proposed. This control algorithm is to adjust the three parameters of PID controller online by fuzzy control method. The contrast simulation experiments of PID and fuzzy PID control methods show that the proposed control method can effectively improve the force and position tracking performance and reduce time delay. DOI: http://dx.doi.org/10.11591/telkomnika.v11i11.2923
Volume: 11
Issue: 11
Page: 6381-6389
Publish at: 2013-11-01

Design of Network Middle-Ware Base on Flash Streaming Media

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2833
Jian Huang , Xiaopei Liu , Hongmei Yan
This paper analyzes the main information and streaming media service function of Real Time Messaging Protocol for Flash media remote play. It simplifies and achieves the Flash AV network live broadcast, network broadcasting and releasing function, which can support to operate in the cross-platform of Windows, Linux and embedded system with good property by the cross-platform testing. Meanwhile, it supports to connect with FMP seamlessly, being widely applied in the AV server of Windows, Linux platform or the network AV electronic products of embedded platform connecting with FMP seamlessly. DOI: http://dx.doi.org/10.11591/telkomnika.v11i11.3525
Volume: 11
Issue: 11
Page: 6755-6761
Publish at: 2013-11-01

A Novel Wisdom Network Design and Its Principles

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2860
Fuhong Lin , Xianwei Zhou
Next generation network is a hot topic that lots of researchers have paid their attention to this point. The main idea is making people more comfortable and convenient. This paper presents a novel wisdom network which tends to achieve the above mentioned advantages. This network is composed by User Part and Server Part. Further, Server Part is divided into Gateway Server part and Data Server part. According to the network architecture, some design principles are analyzed and modeled, including the following aspects: resource registration and retrieval, data pieces replication, Gateway Server performance and load balance achievement. Key word:Wisdom network, resource registration and retrieval, data replication, load balance. DOI: http://dx.doi.org/10.11591/telkomnika.v11i11.3584
Volume: 11
Issue: 11
Page: 6964-6971
Publish at: 2013-11-01

An Adaptive Fuzzy Control Method for Spacecrafts Based on T-S Model

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2849
Wang Qi , Gao Tian , He He
A model reference adaptive control method is proposed for uncertain nonlinear characteristics of spacecraft attitude control system. This method combines fuzzy control methodology and nonlinear feedback linearization methodology, which made the closed-loop system stable and the state of fuzzy system track the state of reference model according to the parallel distributed compensation theory and the rational design of the fuzzy state feedback control law. The nonlinear closed-loop system was linearized by selecting fuzzy state feedback parameters and fuzzy membership function. Then an adaptive control law was designed by Lyapunov function. As a result the system can be adaptive to all kinds of parameter uncertainties and robust to modeling inaccuracy and external disturbance. Meanwhile, the simulation results indicate that the control law can quickly guarantee the stability of the spacecraft attitude and be robust to model perturbations and external disturbances. DOI: http://dx.doi.org/10.11591/telkomnika.v11i11.3549
Volume: 11
Issue: 11
Page: 6879-6888
Publish at: 2013-11-01

A Virtual Machine Cloning Approach Based on Trusted Computing

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2856
Wei Ma , Xiaoyong Li , Yong Shi , Yu Guo
Cloud computing has become more and more popular and the technology of rapid virtual machine (VM) cloning is widely used in cloud computing environment to implement the fast deployment of VMs to meet the need of bursting computational request. However, the security issue of VM cloning technology is not considered thoroughly in current approaches. This paper proposes a virtual machine cloning approach based on trusted computing which deals with memory and disk of a VM separately. This approach resolves three problems: the identities verification of involved servers; the attestation of source VM and destination VM; the protection of integrity of transmitted data. DOI: http://dx.doi.org/10.11591/telkomnika.v11i11.3558
Volume: 11
Issue: 11
Page: 6935-6942
Publish at: 2013-11-01

Model Reference Adaptive Speed Control of 2-Phase Travelling Wave Ultrasonic Motor

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2776
Zhang Wen Yu , Shi Jing Zhuo
Adopting relatively simple motion control algorithm, helps reduce the cost of ultrasonic motor system including the drive control circuit, so as to promote its industrialization. For this purpose, this paper presents a simple model reference adaptive control strategy. The small amount of calculation of the policy, and with a certain degree of adaptive capacity, improves the system cost-effective.DOI: http://dx.doi.org/10.11591/telkomnika.v11i11.3551
Volume: 11
Issue: 11
Page: 6337-6343
Publish at: 2013-11-01

Software Aging Prediction Based on Extreme Learning Machine

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2805
Xiaozhi Du , Huimin Lu , Gang Liu
In the research on software aging and rejuvenation, one of the most important questions is when to trigger the rejuvenation action. And it is useful to predict the system resource utilization state efficiently for determining the rejuvenation time. In this paper, we propose software aging prediction model based on extreme learning machine (ELM) for a real VOD system. First, the data on the parameters of system resources and application server are collected. Then, the data is preprocessed by normalization and principal component analysis (PCA). Then, ELMs are constructed to model the extracted data series of systematic parameters. Finally, we get the predicted data of system resource by computing the sum of the outputs of these ELMs. Experiments show that the proposed software aging prediction method based on wavelet transform and ELM is superior to the artificial neural network (ANN) and support vector machine (SVM) in the aspects of prediction precision and efficiency. Based on the models employed here, software rejuvenation policies can be triggered by actual measurements. DOI: http://dx.doi.org/10.11591/telkomnika.v11i11.3495
Volume: 11
Issue: 11
Page: 6547-6555
Publish at: 2013-11-01

A High Performance Sigma-Delta ADC for Audio Decoder Chip

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2808
Yu Fan , Yang Huijing , Li Gang
This paper gives a high performance sigma delta Analog to Digital Converter (ADC) applied in computer audio decoder chip. In this design, a 3rd-order single-loop CIFF topology is chosen to achieve the high performance ADC. Its signal bandwidth is 20KHz, sampling frequency is 10.24MHz and oversampling ratio is 256. Local feedback coefficient is used to reduce quantization noise. The non-linear model of modulator is given and the stability is analyzed. It is got that when quantizer gain is bigger than 0.322 the system is stable. According to simulation, Signal to Noise Ratio (SNR) is 123.1dB and Effective Number of Bits (ENOB) is 20.15bits. When input level is bigger than -3dBFs, the modulator is overload and becomes unstable. Then the integrator, quantizer and feed forward summation in ADC circuit are designed.  Then the ADC is implemented in 0.6um CMOS process, and the test result shows that its performance is 99.28dB. DOI: http://dx.doi.org/10.11591/telkomnika.v11i11.3498
Volume: 11
Issue: 11
Page: 6570-6576
Publish at: 2013-11-01

Analysis of Dither in PWM Control on Electro-hydraulic Proportional Valve

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2840
Guoping LIU , Wuxing XIA , Dawei QI , Ronghua HU
Plus with modulation (PWM) is widely used in proporational control systems for it is efficient, flexible and anti-interference. Due to the friction and hysteresis of electromagnet, hysteresis exists when hydraulic valve in steady-state, and hysteresis influences the dynamic characteristics of the valve seriously,the hysteresis can be improved by superimposing dithers with certain frequency and amplitude to the valve coil. Aiming at the character of anti-unloading power driver circuit ,this paper analyzed the parasitic dither which exists in ±24V PWM control，besides，the experiment shows that in a high frequency PWM, dither with independent frequency and amplitude can be generated by changing the frequency of the PWM, in this way, the dithers  and average current of coil  can be adjusted separately by changing PWM frequency and PWM duty cycle. DOI: http://dx.doi.org/10.11591/telkomnika.v11i11.3698
Volume: 11
Issue: 11
Page: 6808-6814
Publish at: 2013-11-01

Instruction Pipeline Efficient Mechanism with maximum hit ratio

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2792
Shahnawaz Talpur
To achieve highest performance in rapidly growing advancement in multi-core technology, there is need to minimize the large gap between faster processor speed and memory. It becomes more critical issue when branch occurs with penalty of cache miss. Many researchers proposed different branch prediction, instruction perfecting methods and algorithms but the CPU pipeline performance couldn’t be the maximal. A prototype model has been designed in this paper which has no prediction for branch and no chance of CPU core to be idle. Analysis is carried out on the benchmarks suite and Transactional Slice (TS) has been proposed in contrast with traditional delay slot and dynamic prediction fetch branch. In proposed mechanism hit rate will be maximal.  Pin Tool is used to analyze the Transactional Slice with SPEC 2006 benchmark. DOI:  http://dx.doi.org/10.11591/telkomnika.v11i11.3216 
Volume: 11
Issue: 11
Page: 6454-6459
Publish at: 2013-11-01

An Efficient Content Based Image Retrieval Scheme

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2863
Zukuan WEI , Hongyeon KIM , Youngkyun KIM , Jaehong KIM
Due to the recent improvements in digital photography and storage capacity, storing large amounts of images has been made possible. Consequently efficient means to retrieve images matching a user’s query are needed. In this paper, we propose a framework based on a bipartite graph model (BGM) for semantic image retrieval. BGM is a scalable data structure that aids semantic indexing in an efficient manner, and it can also be incrementally updated. Firstly, all the images are segmented into several regions with image segmentation algorithm, pre-trained SVMs are used to annotate each region, and final label is obtained by merging all the region labels. Then we use the set of images and the set of region labels to build a bipartite graph. When a query is given, a query node, initially containing a fixed number of labels, is created to attach to the bipartite graph. The node then distributes the labels based on the edge weight between the node and its neighbors. Image nodes receiving the most labels represent the most relevant images. Experimental results demonstrate that our proposed technique is promising.DOI: http://dx.doi.org/10.11591/telkomnika.v11i11.3588
Volume: 11
Issue: 11
Page: 6986-6991
Publish at: 2013-11-01
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