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23,675 Article Results

Guarantee Agency Efficiency Evaluation Based on Super-Efficiency DEA-AHP Model

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2445
Xu Ke , Liang Xuechun
In order to evaluate the efficiency of the guarantee agencies and achieve the purpose of identifying there competitive advantages, through the analysis of advantages and disadvantages of previous DEA-AHP methods, this paper puts forward a Super-efficiency DEA-AHP model, which can not only completely and more accurately rank the guarantee agencies but also comprehensively reflect the weights of the importance of each index which influence the efficiency of the guarantee agencies. Through the case analysis and the comparison with other models, the model shows its validity.DOI: http://dx.doi.org/10.11591/telkomnika.v11i7.2849
Volume: 11
Issue: 7
Page: 3981-3989
Publish at: 2013-07-01

Multi-Machine Controller Design of Permanent Magnet Wind Generators using Hamiltonian Energy Method

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2420
Bing Wang , Yanping Qian , Honghua Wang Wang
In this paper, the nonlinear control problem of permanent magnet wind generators is investigated based on Hamiltonian energy method. A nonlinear design method is proposed for the multi-machine system, such that the closed-loop system is stable simultaneously. Moreover, in the presence of disturbances, the closed-loop is finite–gain L2stable under the action of the Hamiltonian controller. In order to illustrate the effectiveness of the proposed method, the simulations are performed which show that the gotten controller can improve the transient property and robustness of the system. DOI: http://dx.doi.org/10.11591/telkomnika.v11i7.2824
Volume: 11
Issue: 7
Page: 3750-3758
Publish at: 2013-07-01

A Intrusion Detection Method Based on Neighborhood Rough Set

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2418
Ming-Xiang He , Dong-Dong Qiu
A well-prepared abstract enables the reader to identify the basic content of a document quickly and accurately, to determine its relevance to their interests, and thus to decide whether to read the document in its entirety. The Abstract should be informative and completely self-explanatory, provide a clear statement of the problem, the proposed approach or solution, and point out major findings and conclusions. The Abstract should be 100 to 150 words in length. The abstract should be written in the past tense. Standard nomenclature should be used and abbreviations should be avoided. No literature should be cited. The keyword list provides the opportunity to add keywords, used by the indexing and abstracting services, in addition to those already present in the title. Judicious use of keywords may increase the ease with which interested parties can locate our article. DOI: http://dx.doi.org/10.11591/telkomnika.v11i7.2821
Volume: 11
Issue: 7
Page: 3736-3741
Publish at: 2013-07-01

Sinusoidal Signal Generator for ADC Testing in Mixed-Signal SOC

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2415
Shirong Yin , Yituan He
Sinusoidal signal can be used as stimulus to test static and dynamic parameters of ADC. A sigma-delta modulation based sinusoidal signal generator for ADC testing in SOC was introduced. The generator was built on the same chip with ADC. A numerical resonator generated a sinusoidal signal which was converted to a single bitstream by a sigma-delta modulator. Due to oversampling, the quantization noise was pushed to high frequency range. A high-quality sinusoidal signal was generated by low-pass filtering the bitstream. The sigma-delta modulator was inserted into the resonator to decrease silicon area overhead and calculate time. A cascaded integrator comb decimation filter was used as the low-pass filter. The amplitude and frequency of the output sinusoidal signal could be accuratly set by digital parameter of the generator to meet the requirement of static and dynamic performances testing. DOI: http://dx.doi.org/10.11591/telkomnika.v11i7.2818 
Volume: 11
Issue: 7
Page: 3711-3717
Publish at: 2013-07-01

A Maneuvering Target Tracking Algorithm Based on the Interacting Multiple Models

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2447
Liu Yan-Chang , Zuo Xian-Gang
In view of the limitation of the traditional Kalman filter with which the tracking has big calculation amount and low tracking precision base on the model of CV or CA movement, a algorithm is suggested in the present article which is the Interacting Multiple Models Kalman filter(IMM-KF) with the CV and CA model. Under keeping invariant of the tracking precision of linear motion, This method can make the tracking precision of curve motion approach the linear motion’s. The system simulation results show that this algorithm improved the tracking precision of system with the IMM-KF. DOI: http://dx.doi.org/10.11591/telkomnika.v11i7.2851 
Volume: 11
Issue: 7
Page: 3997-4003
Publish at: 2013-07-01

Study on China’s Electronic Information Industrial Agglomeration and Regional Industrial Competitiveness

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2450
Xuan Zhaohui , Wu Aizhi , Lv Yongbo
Spatial agglomeration and industrial competitiveness are currently two key issues in the study of China’s electronic information industrial development. Based on the data for 1995 - 2010, this paper establishes the indicator system to evaluate the competitiveness of regional electronic information industry. In this paper, location Gini coefficient and the indicator of concentration rate are applied to analyze the characteristics and historical evolution of China’s electronic information industrial agglomeration, while benchmarking analysis is also applied to evaluate the competitiveness of provincial regional electronic information industry. The correlation between industrial agglomeration and industrial competitiveness is analyzed in this study. There is a significant positive correlation between them at present. DOI: http://dx.doi.org/10.11591/telkomnika.v11i7.2854 
Volume: 11
Issue: 7
Page: 4020-4029
Publish at: 2013-07-01

High Power Factor Power Design

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2444
Zhang Jing-yi
The PFC circuit takes UCC28019 made by TI Company as the core of system control, realize the power factor correction circuit functions, and the circuit power factor can be measured. Through a variety of detection circuit, with the support SCM control. And 30V~36V output voltage regulator can be set; with over-current protection circuits function, and be able to automatically back. Output current, voltage, and little significant value are displayed by display modules. DOI: http://dx.doi.org/10.11591/telkomnika.v11i7.2848
Volume: 11
Issue: 7
Page: 3973-3980
Publish at: 2013-07-01

An improved Channel Estimation Algorithm for Ultra- Wideband Wireless Communication Systems

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2464
Liu Jinhu , Mei Feihu
  Traditional DFT channel estimation algorithm is relatively balanced in terms of complexity and estimation performance, but compared with the four typical channels of UWB, especially in terms of CM1 and CM2 channel with a small number of the diameter, the cyclic prefix length is relatively much larger than the length of their delay, so the back part is still noise. Aimed at this problem, an improved DFT channel estimation algorithm is brought up in this paper, and this algorithm adds the appropriate threshold threshold in the CP to further eliminate noise, and simulation results show that the improved algorithm is better than the original algorithm. DOI: http://dx.doi.org/10.11591/telkomnika.v11i7.2871
Volume: 11
Issue: 7
Page: 4129-4133
Publish at: 2013-07-01

A Gravitational Edge Detection for Multispectral Images

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2406
Genyun Sun , Zhenjie Wang
Gravitational edge detection is one of the new edge detection algorithms that is based on the law of gravity. This algorithm assumes that each image pixel is a celestial body with a mass represented by its grayscale intensity and their interactions are based on the Newtonian laws of gravity. In this article, a multispectral version of the algorithm is introduced. The method uses gravitational techniques in combination with metric tensor to detect edges of multispectral images including color images. To evaluate the performances of the proposed algorithm, several experiments are performed. The experimental results confirm the efficiency of the multispectral gravitational edge detection. DOI: http://dx.doi.org/10.11591/telkomnika.v11i7.2808 
Volume: 11
Issue: 7
Page: 3641-3647
Publish at: 2013-07-01

Research on Hybrid Ray-tracing at 2.4 GHz in Man-Made Forests

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2430
Yun-jie Xu , Wen-bin Li
The shadow of diffraction, which account for the growth of trees based on wireless sensors and automatic acquisition of environmental information, were presented to meet the requirements for a wireless sensor network in a forest.  there’s a necessity to avoid the dead zone of signal diffraction when laying wireless sensor in the forest, the integration of SBR and UTD is applied to study the impact of 2.4GHz radio-frequency signal on the path loss characteristics in the forest. Shadow fading is studied by considering random variations of trees height and position. Path loss to subscribers located in a forest are found using refraction and diffraction concepts. This paper achieved the ray location from the receive pint to field point by using back-ray tracing method and computed the response electric field relative to each ray by using UTD. This article presents an overview of popular prediction models and describes electric field algorithms that are based on the authors' experience, to improve their accuracy.  Take the poplar planted forest for instance. The measured value and simulated value were compared, finding good consistency between them, which indicates that SBR and UTD can effectively predict the path loss characteristics in the forest. DOI: http://dx.doi.org/10.11591/telkomnika.v11i7.2833
Volume: 11
Issue: 7
Page: 3834-3840
Publish at: 2013-07-01

An SLA based SaaS Security Level

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2462
Yongjing A. Li , Jiang B. Wu
 This paper proposes a data security protection strategy of the SaaS mode -the SLA based SaaS Security Level. At the same time, it gives concept model and implementation architecture of the security scheme which based on the SaaS Security Level. The SLA based SaaS Security Level takes the requirements of tenants to the data security as a starting point, and it mainly relates to data security of the data center, data security of the servers and data security of the clients. This Security Level can better meet diversified users needs than the traditional security model. According to the tenants desired service number and the protection degree of data information, they can dynamically select different levels of the security strategies. Then, according to the dynamic changes of SLA, the SaaS vendors can adjust data protection strategy of the user timely. For supporting our SaaS Security Level, we build SSM (SaaS Security Model) test-bed. On the SSM test-bed, we have done some experiments, which confirmed our SaaS Security Level is feasible and easy to use. DOI: http://dx.doi.org/10.11591/telkomnika.v11i7.2870
Volume: 11
Issue: 7
Page: 4111-4121
Publish at: 2013-07-01

Mining Non-redundant Associations From the Frequent Concept Sets on FP-tree

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2401
Wang Hui
The classical algorithm for mining association rules is low efficiency. Generally there is high redundancy between gained rules. To solve these problems, a new algorithm of finding non-redundant association rules based on frequent concept sets was proposed.The Hasse graph of these concepts was generated on the basis of the FP-tree. Because of the restriction of the support most Hasse graphs have losed lattice structure. During building process of the Hasse graph, all nodes were formatted according to the index of items which were found in the fequent-item head table. At the same time these nodes were selected by comparing supports. In the Hasse graph, the intention of node is frequent itemset and the extension of node is support count of this itemset. And the non-redundant association rules were gained by scanning the leaf nodes of the graph.The simulation shows the feasibility of the algorithm proposed. DOI: http://dx.doi.org/10.11591/telkomnika.v11i7.2803  
Volume: 11
Issue: 7
Page: 3604-3610
Publish at: 2013-07-01

Contact Analysis on The Whole Frame of 32.8MN PRESS

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2433
Zhicheng Huang , Nanxing Wu , Xingguo Wang
Automatic hydraulic press is one of the key Ceramic machinery and equipments for pressing ceramic wall and floor tiles, and its frame withstands all of the work force when it works, so the work performances of the frame have an important impact on the structural performance of the entire automatic hydraulic press. Took the frame of 32.8MN automatic hydraulic press as research object, established its three-dimensional model through Pro/Engineer software and carried on contact finite element analysis for it by using the large commercial finite element software ANSYS to gain the stress and strain distribution of the frame, and then carried out a detailed analysis of the results. The work done can help to fully understand the structure properties of existing automatic hydraulic press and serve as guidance to further improve its performance, and at the same time provide a theoretical basis for the structural design of the same type of automatic hydraulic press frame. DOI: http://dx.doi.org/10.11591/telkomnika.v11i7.2836  
Volume: 11
Issue: 7
Page: 3863-3873
Publish at: 2013-07-01

Integrated Rudder/Fin Concise Control Based on Frequency Domain Analysis

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2431
W. Guan , Z. J. Su , G. Q. Zhang
This paper describes a concise robust controller design of integrated rudder and fin control system in use of the closed loop gain shaping algorithm (CGSA) strategy. Compared with the arbitrary selection of weighting function in integrated rudder and fin H∞ mixed sensitivity control design procedures, the CGSA methods provided a relatively more straightforward and concise design method. Simulations were described that the overall performance of each CGSA rudder and fin control loop and the interaction between them. Hence, it can be concluded that the integrated rudder and fin CGSA control scheme is very suitable to present and indeed feasible for future practical application. DOI: http://dx.doi.org/10.11591/telkomnika.v11i7.2834
Volume: 11
Issue: 7
Page: 3841-3854
Publish at: 2013-07-01

Illumination Compensation Algorithm for Unevenly Lighted Document Segmentation

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2465
Ju Zhiyong , Wang Pingdian
 For the problem of segmenting the unevenly lighted document image, this paper proposes an illumination compensation segmentation algorithm which can effectively segment the unevenly lighted document. The illumination compensation method is proposed to equivalently convert unevenly lighted document image to evenly lighted document image, then segment the evenly lighted document directly. Experimental results show that the proposed method can get the accurate evenly lighted document images so that we can segment the document accurately and it is more efficient to process unevenly lighted document  images than traditional binarization methods. The algorithm effectively overcomes the difficulty in handling uneven lighting and enhances segmentation quality considerably. DOI: http://dx.doi.org/10.11591/telkomnika.v11i7.2932
Volume: 11
Issue: 7
Page: 4134-4141
Publish at: 2013-07-01
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