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24,092 Article Results

A New Adaptive Threshold Image-Denoising Method Based on Edge Detection

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/3407
Binwen Huang , Yuan Jiao
In image processing, removal of noise without blurring the image edges is a difficult problem. Aiming at orthogonal wavelet transform and traditional threshold’s shortage, a new wavelet packet transform adaptive threshold image de-noising method which is based on edge detection is proposed. By edge detection method, the wavelet packet coefficients corresponding to edge which is detected and other non-edge wavelet packet coefficients are treated by different threshold. Using the relativity among wavelet packet coefficients and neighbor dependency relation, at the same time, adopting the new variance neighbor estimate method and then the adaptive threshold is produced. From the experiment result, we see that compared with traditional methods, this method can not only effectively eliminate noise, but can also well keep original image’s information and the quality after image de-noising is very well. DOI : http://dx.doi.org/10.11591/telkomnika.v12i5.3533
Volume: 12
Issue: 5
Page: 3509-3514
Publish at: 2014-05-01

A Hybrid Clustering Algorithm Based on Improved Artificial Fish Swarm

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/3442
Liwei Tian , Lin Tian
K-medoids clustering algorithm is used to classify data, but the approach is sensitive to the initial selection of the centers and the divided cluster quality is not high. Basic Artificial Fish Swarm Algorithm is a new type of heuristic swarm intelligence algorithm, but optimization is difficult to get a very high precision due to the randomness of the artificial fish behavior. A novel clustering method based on improved global artificial fish swarm is proposed in this paper by analyzing the advantages and disadvantages of two algorithms, which has the ability to optimize the global clustering effect. The result of the experiment shows that quality of clustering is improved; the optimal central points and the clear division of data groups are obtained by the mathematical model combing improved fish swarm algorithm and K-medoids algorithm. DOI : http://dx.doi.org/10.11591/telkomnika.v12i5.5110
Volume: 12
Issue: 5
Page: 3786-3791
Publish at: 2014-05-01

A Resizing Method for 3D Visualization of Digital Elevation Models

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/3474
Wei Yang , Kun Hou , Xintong Yu , Fanhua Yu
The diversity and versatility of display devices today imposes new demands on digital elevation models (DEMs). This paper proposes a resizing method for 3D visualization of DEMs based on topographic feature. The proposed method improves seaming carving algorithm to resize DEMs instead of images according to the characterristics of DEMs. The proposed resizing method considers not only geometric constraints but also the characteristics of DEMs. Being different from the traditional reduction and expansion methods, the method not only resizes DEMs, but also preserves the characteristics of Digital Elevation Model. The method is implemented and experiments are carried out on actual DEM data. It can be seen from the comparison with scaling method that the proposed method is efficient and provides better 3D visualization of DEMs. DOI : http://dx.doi.org/10.11591/telkomnika.v12i5.4044 
Volume: 12
Issue: 5
Page: 4050-4055
Publish at: 2014-05-01

Partial-state finite-time stabilization control of chaos in PMSM with uncertain parameters

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/3430
Chuansheng Tang , Yuehong Dai , Hongbing Yang
In this paper, a novel partial-state finite-time control scheme is presented for stabilizing chaos in permanent magnet synchronous motor with uncertain parameters. First, a new concept of partial-state finite-time stability is introduced. Based on the cascade-connected system theory, a controller is then designed in detail to improve the performance of the system. The stability of the proposed scheme is verified according to Lyapunov stability. This method is demonstrated to be highly robust again system parametric variations. Finally, numerical simulation results are presented to illustrate the effectiveness of the proposed method. DOI : http://dx.doi.org/10.11591/telkomnika.v12i5.4255
Volume: 12
Issue: 5
Page: 3690-3696
Publish at: 2014-05-01

Application of Intelligent Three-state Pang-Pang Control to Heat Exchange Station

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/3410
Wen Biao Wang , Yong Sun , Si Yuan Wang , Han Wen
The heat exchange station of central heating system has been increasingly widely used as the intermediate hub connecting the heat source and heat users. If the specific temperature control requirements are not satisfied effectively and specifically, the security and stability of the primary network and quality of the secondary network will be affected directly. A temperature control scheme of the heat exchange station is presented based on intelligent three-states Pang-Pang. On the basis of mechanism analysis, we choose the average of supply and return water temperatures of secondary network as the controlled variable in presented temperature control scheme, which is equivalent to inducing the supply water temperature as the feedforward signal. The advantages of the intelligent three-state Pang-Pang control algorithm lie in improving the stability of the primary network, reducing the overshoot and accelerating the response of the secondary network. The application of the presented control scheme to the practical engineering shows that it not only implements the automatic control of the temperature of heat exchange station hence improves its control performance but also enhances and improves the controllability of the system effectively and especially has the referential and extending significance for heat exchange station transforming open-loop to closed-loop control. DOI : http://dx.doi.org/10.11591/telkomnika.v12i5.3538
Volume: 12
Issue: 5
Page: 3529-3536
Publish at: 2014-05-01

Flexible Nanofabrication Equipment: E-beam Lithography System Based on SEM

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/3450
Shuhua Wei , Lan Dai , Jing Zhang
Electron beam lithography (EBL) is widely used in nano-scale device fabrication and research due to high resolution and excellent flexibility. In this paper, nanometer EBL system based on scanning electron microscope (SEM) is introduced. Its main components include a modified SEM, a laser interferometer controlled stage, a versatile high speed pattern generator, and a fully functional and easy-operational software system. In order to explain this EBL system design principle, realization method, this paper mainly introduces each component’s design basis, main structures and functions. Stitching experiments overlay experiments and arbitrary shape patterns exposure experiments have been done on this EBL system based on JSM-35CF SEM. The lithography results demonstrate that the resolution of electron beam lithography system can approach nanometer. This kind of EBL system based on SEM can meet the need of micro-nanofabrication research and design activities at flexibility and low price. DOI : http://dx.doi.org/10.11591/telkomnika.v12i5.4473
Volume: 12
Issue: 5
Page: 3841-3848
Publish at: 2014-05-01

A Study on Peak-to-Average Power Ratio in DWT-OFDM Systems

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/3462
Filbert Hilman Juwono , Randy S. Putra , Dadang Gunawan
Orthogonal frequency division multiplexing (OFDM) systems suffer from large peak-to-average power ratio (PAPR). In this paper we study the discrete wavelet transform (DWT)-based OFDM systems. In particular, we discuss the effect of the decomposition level of each wavelet family in the DWT-based OFDM regarding the PAPR. The simulation results show that, in general, there is a decomposition level that minimize the PAPR in every wavelet family. In addition, we also analyze the effect of clipping nonlinearities, i.e. conventional clipping and deep clipping, as PAPR reduction method in DWT-OFDM systems. The results show that the clipping nonlinearities give a noticeable PAPR reduction. However, as DWT-OFDM itself has lower PAPR compared to the conventional discrete Fourier transform (DFT)-based OFDM, the clipping nonlinearity subsystem may not be essential as it degrades the system performance. DOI : http://dx.doi.org/10.11591/telkomnika.v12i5.5375
Volume: 12
Issue: 5
Page: 3955-3961
Publish at: 2014-05-01

Accurate Low-Current Measurement Circuit for Multimeters and Oscillograps

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/3433
Shuqin Geng , Chen Liu , Jinhui Wang , Ligang Hou , Ying Yuan
A simple and high-precision current-to-voltage (I/V) converter circuit for multimeters and oscillographs is presented in this paper. The I/V converter measures the electric current with  uA and nA selectable ranges in the frequency range from direct current to 1 MHz. Circuit technology is also discussed. System Architecture is presented and dual polarity power is designed. Power detector circuit is explained.  Measurement data are obtained. Linearity and the error are analyzed. The typical accuracy of the μCurrent is higher by 0.085% in the μA and nA ranges. μCurrent can be used in detecting low uA and nA in current systems, chips, and modules. DOI : http://dx.doi.org/10.11591/telkomnika.v12i5.5004
Volume: 12
Issue: 5
Page: 3713-3718
Publish at: 2014-05-01

An Improved Method of SVM-BPSO Feature Selection Based on Cloud Model

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/3465
Jizhen Li , Xiangru Meng , Jing Wen , You Xu
An improved method of SVM-BPSO feature selection based on cloud model is proposed to solve the local deadlock problem of the current SVM-BPSO methods. This method uses the Wrapper evaluation strategy, making SVM as the classifier, BPSO algorithm is adopted to conduct a whole search in the feature space to seek out the optimal feature subset from the classification results of SVM. The inertia weight of BPSO algorithm is adjusted by Cloud Model intelligently and self-adaptively, the whole and local searching capability of SVM-BPSO feature selection algorithm get balanced, and prevent it into the local deadlock effectively. Analysis on simulations shows that the improved method of SVM-BPSO feature selection based on Cloud Model can be able to dap out from the local optimum with a faster convergence rate, and shows good experimental effect. DOI : http://dx.doi.org/10.11591/telkomnika.v12i5.5005
Volume: 12
Issue: 5
Page: 3979-3986
Publish at: 2014-05-01

Test Method for Process Deadlock Based on Graph Grammars

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/3380
Yi Wang , Han Ding , Fan Yang
This paper proposes a test method for process deadlock based on graph grammars through constructing process resource diagram. Through using the construction rules, it can construct and judge the validity of the process resource diagram. Through using the test rules, it can test if there is the deadlock in the process. The method is a graphical approach; it is simple and intuitive with strong operability. DOI : http://dx.doi.org/10.11591/telkomnika.v12i5.4945
Volume: 12
Issue: 5
Page: 3266-3271
Publish at: 2014-05-01

Development and Application of University Information Service

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/3383
Chun Yu , YanXia Li , Fang Yuan , Qian Zhang , Xi Chen
The current situation and existing problems in university informationisation was given briefly, with object of university information service development. It proposed the method to develop information service, including both model design and technology realization on basis of main database. A system, which covers the core data resource of the university and implements one-stop information service has been designed and realized. Integrated with R-ABAC, Portal and dynamic reports, it provided comprehensive inquiry and statistical analysis service of all kinds of information for all the teachers, students and all levels of managerial staff, which applied in individual management, business management and decision making, which serves talents training, the basic task of universities. DOI : http://dx.doi.org/10.11591/telkomnika.v12i5.4948
Volume: 12
Issue: 5
Page: 3289-3296
Publish at: 2014-05-01

Research on Real-Time Optimal Path Algorithm of Urban Transport

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/3408
Jie Zhang , Jianchun Li , Xiaoyan Fan , Zhuo Deng
Based on the ant colony algorithm, urban real-time traffic optimal path algorithm was designed through restricting search area and search direction of ant colony system, making the real-time traffic and distance as the optimal path weights and regarding intersection turning as the impact of weight value combined with Chinese situation. The algorithm could calculate the optimal path through algorithm complexity test. We obtained a traffic optimal path with timeliness and practical value combined with ant colony algorithm considering multiple parameters.The obtained path enabled user to reach destination within a short time and with the least fuel through actual traffic test. It was regarded as the optimal path. DOI : http://dx.doi.org/10.11591/telkomnika.v12i5.3535
Volume: 12
Issue: 5
Page: 3515-3520
Publish at: 2014-05-01

A Novel Decoding Algorithm for BICM-ID Embedded Turbo Codes

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/3401
Jian Wang , Jianping Li , Chaoshi Cai
Bit-interleaved coded modulation iterative decoding (BICM-ID) embedded turbo code is widely used in wireless communication because of its excellent performance. This paper proposes an improved logarithmic maximum a posteriori (Log-MAP) algorithm for BICM-ID embedded turbo codes. It can yield excellent bit error rate (BER) performance with much lower complexity. The proposed algorithm exploits a linear interpolation and Least Squares approximation function to replace the logarithmic correction in the Jacobian logarithmic function, which avoids complicated logarithm look-up table operations in Log-MAP algorithm. Simulation results show that the novel algorithm can offer almost equivalent performance to the optimal algorithm with much less computation. Compared with the improved MAX-Log-MAP algorithm proposed by Talakoub, the proposed algorithm can reduce about 36% of computational complexity, meanwhile it achieves 0.1db-0.16db performance gains. In addition, it obtains 0.35-0.4db gains than MAX-Log-MAP algorithm. DOI : http://dx.doi.org/10.11591/telkomnika.v12i5.4596
Volume: 12
Issue: 5
Page: 3460-3466
Publish at: 2014-05-01

Engine Speed Control of Excavator With PID Method

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/3398
Jun Zhang , Shengjie Jiao , Guimao Si , Xuepeng Cao , Min Ye , Jinping Li , Xinxin Xu , Daopei Zhang
Distinction work task power-matching control strategy was adapted to excavator for improving fuel efficiency; the accuracy of rotate engine speed at each work task was core to excavator for saving energy. 21t model excavator ZG3210-9 was taken as the study object to analyze the rotate speed setting and control method, linear position feedback throttle motor was employed to control the governor of engine to adjust rotate speed. Improved double closed loop PID method was adapted to control the engine, feedback of rotate speed and throttle position was taken as the input of the PID control mode. Control system was designed in CoDeSys platform with G16 controller, throttle motor control experiment and engine auto control experiment were carried on the excavator for tuning PID parameters. The result indicated that the double closed-loop PID method can take control and set the engine rotate speed automatically with the maximum error of 8 rpm. The linear model between throttle feedback position and rotate speed is established, which provides the control basis for dynamic energy saving of excavator. DOI : http://dx.doi.org/10.11591/telkomnika.v12i5.4917
Volume: 12
Issue: 5
Page: 3423-3430
Publish at: 2014-05-01

High Voltage Security System Design and Testing of Electric Car

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/3428
Peng Hailan , Jiang Zhilong
Safety design of high voltage part is the foundation of the whole automobile design; it is based on safety design requirements of the electric car, and the security function of hardware. The design the different functions of hardware modules are presented, through circuit principle diagram layout of PCB, and circuit board is made, the systems hardware test board is design according to the functional test of the system. Test results show that relative errors between the measurement of insulation resistance value of the safety system and the theoretical value is only 0.3%, thus the rationality of the design calculation model of the insulation resistance is verified. The response times of DC (direct current) contactor are higher than the national standard requirements, so the system security design meets the design requirements. DOI : http://dx.doi.org/10.11591/telkomnika.v12i5.4899
Volume: 12
Issue: 5
Page: 3678-3683
Publish at: 2014-05-01
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