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23,675 Article Results

Research of Semantic Network Knowledge Representation and Query Algorithm Based on Relational Model

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2811
Li Yue-xin , Hong Zong-xiang
Because of the solid foundation, mature technology, rich products of relational database ,it has been the first consideration for studying and storing the massive data. How to build an effective knowledge base based on the powerful storage and processing capability is always the key issue for the research and application of knowledge engineering and intelligent system ,but also the bottleneck knowledge management turns into the application of technology .In this paper ,a relational model of semantic network has been given and discusses with examples the storage of relational data table based on the semantic network knowledge representation. Once semantic network relational model  established, the knowledge base that based on semantic network will be set up. In this paper, Semantic network knowledge base query algorithm is studied. DOI: http://dx.doi.org/10.11591/telkomnika.v11i11.3502 
Volume: 11
Issue: 11
Page: 6591-6599
Publish at: 2013-11-01

Two Levels Data Fusion Filtering Algorithms of Multimode Compound Seeker

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2767
Zhang Guodong , Liu Zhong
The multimode compound guidance is an important guidance system which can assurance missile impact accuracy in the complicated electromagnetic environment. Aiming at the data fusion filtering problem of multimode compound seeker, this paper presents a two-stage data fusion algorithm. First of all, each sensor data is send into first-stage fusion structure for centralized fusion processing after time registration, and then the processing results are sent into second-stage fusion structure for distributed fusion processing with radar and infrared information processing results. Meanwhile, in order to solve the problems that the different observation information in distributed fusion structure has different dimensions, the observation data is extended to the same dimension. Simulation results show that the proposed algorithm can effectively improve the data fusion efficiency, and improve the efficiency of the filter convergence accuracy and convergence speed, which has a certain guiding significance to engineering practice. DOI: http://dx.doi.org/10.11591/telkomnika.v11i11.2696
Volume: 11
Issue: 11
Page: 6274-6280
Publish at: 2013-11-01

An Implementation of Remote Monitoring Standing Tree Diameter at Breast Height

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2799
Liyuan Jiang , Wenbin Li , Jiangming Kan , Zhibin Hao , Qing Xu
Studies show that there is electric potential difference between the internal part of tree and the soil, but the mechanism is not clear, possibly associated with tree species, environmental factors and DBH (diameter at breast height) of tree. In order to research the mechanism and change rules, it is necessary to measure bioelectricity, environmental factors and DBH of tree, among which the DBH and its growth is an important indicator. A kind of DBH of tree and its growth automatic measuring system has been designed based on the angular displacement sensor. The system can realize remote monitoring function of DBH measurement and the growth, and can be set by structural parameters to measure the size of DBH. In this paper, the experiments require the DBH of tree ranges from 0~40cm, and calculation system can measure the DBH less than 0.0436mm theoretically, meeting the measurement requirements and providing reliable data for researching mechanism of trees. DOI: http://dx.doi.org/10.11591/telkomnika.v11i11.3489
Volume: 11
Issue: 11
Page: 6507-6513
Publish at: 2013-11-01

An Indeterminacy Temporal Data Model Based on Probability

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2824
Ren Shuxia , Zhao Zheng , Zou Xiaojian
There are many kinds of indeterminacy temporal data in temporal database. Therefore, many researchers have focused on building indeterminacy temporal data models. Unfortunately, established models can’t adequately address the challenges posed by indeterminacy temporal information, and can’t adapt to all sorts of involved applications. In this paper, we propose a temporal data model, named BPTM (Temporal model based on probability), to manage the indeterminacy temporal semantics of indeterminacy data. Firstly, we present our tuple-timestamp method to represent and store these temporal data including determinacy and indeterminacy data. Then we introduce the temporal primitives to process temporal relations needed in BPTM. A new probability method is brought forward to get potential information among these indeterminacy data. At last a query example based on CPR (Computer-based Patient Record) is given to show that our method is effective and feasible. DOI: http://dx.doi.org/10.11591/telkomnika.v11i11.3516
Volume: 11
Issue: 11
Page: 6686-6692
Publish at: 2013-11-01

Ship Dynamic Positioning Systems Based on Fuzzy Predictive Control

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2835
Wang Liyun , Xiao Jianmei , Wang Xihuai
Dynamic Positioning Systems (DPS) is a technique of automatically maintaining the position of vessels within the specified limits by controlling thrusters. This paper introduces a fuzzy predictive control to position vessels. Firstly, the mathematical model of vessel is created and simplified. Then, we use feed-forward compensation to decouple the system. The T-S model is identified by Fuzzy C-Means clustering algorithm and Least Squares method. After that, we use Generalized Predictive Control (GPC) to control the ships in three degrees of freedom (DOF)-surge, sway and yaw. The simulation results show that the fuzzy predictive control can orient the vessels effectively.  DOI: http://dx.doi.org/10.11591/telkomnika.v11i11.3527
Volume: 11
Issue: 11
Page: 6769-6779
Publish at: 2013-11-01

Study on the Method of the Self-adapting Image Threshold Divided in the Surface Image of the Tubular Cartridge Case

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2858
Wu Qizhou , Jin Yong , Wang Liming
The technology of detecting the internal and external diameter of the tubular cartridge case that using scanistor to obtain the image of the tubular cartridge case surface, aiming at the difference in the image of the surface between the degree of color gray. This article proposed the self-adapting image threshold divided method that base on mean and standard difference of the image of the surface using to definition threshold, solved the key question of the surface image manipulation, make the detecting result reaching the upper precision. DOI: http://dx.doi.org/10.11591/telkomnika.v11i11.3581
Volume: 11
Issue: 11
Page: 6951-6955
Publish at: 2013-11-01

Short-term Power Load Forecasting Based on Gray Theory

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2847
Cui Herui , Bo Tao , Li Yanzi
Power load forecasting provides the basis for the preparation of power planning, especially the accurate short-term power load forecasting. It can formulate power rationing program of area load reliably and timely, to maintain the normal production and life. This article describes the gray prediction method, and improves GM (1,1) model via processing the original data sequence smoothly, using the correction model of parameteramending parameter values, adding the residual model, and also applying the idea of the metabolism. It conducts an empirical analysis of the 10KV large cable of Guigang Power Supply Bureau in Nan Ping, and verifies the limitations of ordinary gray theory. The improved gray model has a higher prediction accuracy than the conventional GM (1,1) model. DOI: http://dx.doi.org/10.11591/telkomnika.v11i11.3547  
Volume: 11
Issue: 11
Page: 6862-6869
Publish at: 2013-11-01

Simulation of Photon Correlation Spectroscopy Signal Using Orthogonal Inverse Wavelet Transform

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2797
WANG Yajing , DOU Zhenhai
Computer simulation is a more convenient and faster method obtaining photon correlation spectroscopy (PCS) signal. Based on orthogonal inverse wavelet transform (OIWT), a new simulation method is developed. This method considers that PCS signal of a single scale is composed of several sub-band signals with different characteristic. According to the relationship of power spectrum of PCS signal and orthogonal wavelet coefficients of every scale, using OIWT, PCS signal can be obtained by simulation of several different sub-band signals. Using this method, PCS signals of 90nm, 600nm and1000nm are respectively simulated. Mean square errors of the power spectrums of the simulation signals and their theoretical power spectrums are e-5 order of magnitude. The relative errors of particle size inverted from simulation signals are less than 2.47%. Comparison of simulation and experiment proves that that OIWT is feasible for simulation of PCS signal. In addition, by analyzing the influence of simulation parameters on simulation accuracy, we get relationship of particle size, decomposition scale and sampling frequency. DOI: http://dx.doi.org/10.11591/telkomnika.v11i11.3487 
Volume: 11
Issue: 11
Page: 6491-6499
Publish at: 2013-11-01

Public Evacuation Process Modeling and Simulatiaon Based on Cellular Automata

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2794
Zhikun Wang
Considering attraction of the nearest exit, repulsive force of the fire, barrier and its display style, effect of fire exit location on escape time in fire hazard, a mathematical model of evacuation process model was build based on cellular automatic theory. The program was developed by JavaScript. The influencing factors of evacuation were obtained through the simulation model by inputting crew size, creating initial positions of crew and fire seat stochastically. The experimental results show that the evacuation simulation model with authenticity and validity, which has guiding significance for people evacuation and public escape system design. DOI: http://dx.doi.org/10.11591/telkomnika.v11i11.3484  
Volume: 11
Issue: 11
Page: 6468-6476
Publish at: 2013-11-01

Operational Modal Analysis of Wind Turbine Speed-increase Gearbox

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2826
LI Yafeng , XU Yuxiu
Speed increase transmission gear box is the primary vibration and noise source of wind turbine, Operational modal method was adopted to collect impact data and response data of each point based on the gearbox test model. ANSYS finite element model is established to simulate the wind turbine gearbox. Then the modal frequencies of the two methods were compared to ensure the test model is correct. The results show that operational modal method can be applied in wind turbine gearbox modal analysis and it has important guiding significance to gearbox fault diagnosis and reliability and maintainability improving. DOI: http://dx.doi.org/10.11591/telkomnika.v11i11.3518 
Volume: 11
Issue: 11
Page: 6699-6705
Publish at: 2013-11-01

Application of data fusion in computer facial recognition

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2787
Wang Ai Qiang , Han Min
The recognition rate of single recognition method is inefficiency in computer facial recognition. We proposed a new confluent facial recognition method using data fusion technology, a variety of recognition algorithm are combined to form the fusion-based face recognition system to improve the recognition rate in many ways. Data fusion considers three levels of data fusion, feature level fusion and decision level fusion. And the data layer uses a simple weighted average algorithm, which is easy to implement. Artificial neural network algorithm was selected in feature layer and fuzzy reasoning algorithm was used in decision layer. Finally, we compared with the BP neural network algorithm in the MATLAB experimental platform. The result shows that the recognition rate has been greatly improved after adopting data fusion technology in computer facial recognition. DOI: http://dx.doi.org/10.11591/telkomnika.v11i11.3384
Volume: 11
Issue: 11
Page: 6420-6426
Publish at: 2013-11-01

A Frame Synchronization Algorithm Based on LLR Threshold of LDPC Decoding Value

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2865
Zhixiong Chen , Dongsheng Han , Hongyin Xiang
A LDPC code-aided frame synchronization algorithm based on likelihood ratio value threshold is proposed and analyzed in this paper. For soft information vectors with different frame offsets, the likelihood ratio value presenting the probability ratio of satisfaction of all check restrictions and dissatisfaction of all check restrictions are computed respectively, and then the point larger than a threshold is chosen as the final frame synchronization bounder. The method to select the threshold is studied theoretically and is analyzed according to simulation result. And Frame synchronization error ratio of new algorithm is derived. Compared to exiting LDPC code-aided frame synchronization algorithm based on maximum LLR, new algorithm saves synchronization searching time. Synchronization performance simulation results of new algorithm are given and analyzed.  DOI: http://dx.doi.org/10.11591/telkomnika.v11i11.3721
Volume: 11
Issue: 11
Page: 6999-7006
Publish at: 2013-11-01

Multi-focus Image Fusion Based on Region Segmentation

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2829
Yuan Jia-zheng , Li Qing , Sun Bo-xuan
We proposed a new image fusion algorithm based on region segmentation. The algorithm divided the adjacent region from the image through the edge detection, then using wavelet transform with different high-frequency fusion method in each sub-region, to retain the edge information of the source image. The experimental results showed that the image fusion algorithm based on region segmentation can overcome the drawbacks of single segmentation rule and processing in specific part, and the effect is better than the traditional wavelet-based image fusion algorithm. DOI: http://dx.doi.org/10.11591/telkomnika.v11i11.3521
Volume: 11
Issue: 11
Page: 6722-6727
Publish at: 2013-11-01

Multi-Objective Optimization Algorithms Design based on Support Vector Regression Metamodeling

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2785
Qi Zhang , Guangchun Yang , Rui Tang , Guoqi Xiang
In order to solve the multi-objective optimization problem in the complex engineering, in this paper a NSGA-II multi-objective optimization algorithms based on Support Vector Regression Metamodeling is presented. Appropriate design parameter samples are selected by experimental design theories, and the response samples are obtained from the experiments or numerical simulations, used the SVM method to establish the metamodels of the objective performance functions and constraints, and reconstructed the original optimal problem. The reconstructed metamodels was solved by NSGA-II algorithm and took the structure optimization of the microwave power divider as an example to illustrate the proposed methodology and solve themulti-objective optimization problem. The results show that this methodology is feasible and highly effective, and thus it can be used in the optimum design of engineering fields. DOI: http://dx.doi.org/10.11591/telkomnika.v11i11.2628
Volume: 11
Issue: 11
Page: 6406-6412
Publish at: 2013-11-01

An Efficient Reverse Converter for The New High Dynamic Range 5-Moduli Set

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2809
Xiaolan Lv , Ming Xiao
In this paper, an efficient residue to binary converter design for the new high dynamic range moduli set {2n-1,2n+1,22n,22n+1,22n-1-1} is presented. The reverse conversion in the four-moduli set {22n, 22n+1, 2n+1, 2n-1} has been proposed in literature. Hence, the converters are based on the new moduli set {22n-1-1, (2n-1)(2n+1)(22n+1)22n} and propose its residue to binary converter using New Chinese Remainder Theorem 2 ( New CRT 2). The new moduli set is proposed with a dynamic range 8n-1 bits and has the same features of the popular one. When compared to the common five moduli reverse converters, this enhanced moduli set has more dynamic range, and it useful for high performance computing. DOI: http://dx.doi.org/10.11591/telkomnika.v11i11.3499
Volume: 11
Issue: 11
Page: 6577-6583
Publish at: 2013-11-01
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