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23,598 Article Results

Equipment maintenance support capability evaluation using cloud barycenter evaluation method

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2004
Hongqiang Gu , Cheng Zhang , Quan Shi
Maintenance support is the most important measures to keep equipments having high operational capabilities. Equipment maintenance support capability is an important part of operational capability and the evaluation of equipment maintenance support capability is very important to the establishment of battle effectiveness. The evaluation index system of equipment maintenance support capability is established according to the evaluation index establishing principles. Cloud barycenter evaluation method is applied to equipment maintenance support capability evaluation on basis of the established evaluation index system. The application steps of cloud barycenter evaluation method to equipment maintenance support capability evaluation are analyzed. A calculating example for equipment maintenance support capability using the proposed algorithm is presented and the evaluation results are achieved using the weighted deflection degree which is used to demonstrate the deflection degree between equipment maintenance support capability and its perfect state. The correctness and validity of the proposed method is verified by the calculating results, which provide an efficient method for equipment maintenance support capability evaluation. DOI: http://dx.doi.org/10.11591/telkomnika.v11i2.1982
Volume: 11
Issue: 2
Page: 599-606
Publish at: 2013-02-01

Distance Characteristics of Sound Wave Attenuation in ER Fluids

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2016
Nanhui Yu , Jijun Fan
Electrorheological fluids(ER fluid) as an electrically controllable acoustic medium has been proved by experimental studies. In this paper,the sound attenuation in ER fluid at different propagation distances was experimentally studied. The results show that sound attenuation of ER fluid could be adjusted by the particle concentration of ER fluid and the intensity of electric field. Amplitude of sound wave in ER fluid increases with the increasing of particle concentration and field intensity; on the other hand, the attenuation of sound wave decreases with the increasing of propagation distance, as well as the particle concentration and field intensity. The experimental results indicate that the solidification effect of ER fluid is beneficial to the propagation of sound wave. DOI: http://dx.doi.org/10.11591/telkomnika.v11i2.1994
Volume: 11
Issue: 2
Page: 689-693
Publish at: 2013-02-01

The Improve Algorithm of the Sky Illumination Rendering

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2022
Wenlong Yu , Limin Zhang
This paper proposed the algorithm of the sky color rendering based on the relationship between the height of viewpoint and the altitude of scattering point with atmospheric density after the study of atmospheric absorption and scattering and sky illumination simulation methods. It proposed the simplified algorithm of the sky perspective illumination. The geometrical model of the sky dome and rotation and the sun location is presented. The rendering method based on GPU is designed. The results of experiment show that the rendering effect of the sky illumination based on this algorithm is realism. DOI: http://dx.doi.org/10.11591/telkomnika.v11i2.2000
Volume: 11
Issue: 2
Page: 736-739
Publish at: 2013-02-01

Robust Control of Urban Industrial Water Mismatching Uncertain System

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2058
LI Kebai , ZHAO Yuhua
Urban industrial water system parameter fluctuation producing uncertainty may not occur in a control input channel, can be applied mismatching uncertain system to describe. Based on Lyapunov direct method and linear matrix inequality, design the urban industrial water mismatching uncertain system feedback stabilization robust control scheme. Avoid the defects that the feedback stabilization control method based on the matrix Riccati equation need to preset equation parameters, easier to solve and can reduce the conservative. DOI: http://dx.doi.org/10.11591/telkomnika.v11i2.2068
Volume: 11
Issue: 2
Page: 1012-1017
Publish at: 2013-02-01

Adaptive Control of Rotor-bearing System with Coupling Faults of Pedestal Looseness and Rub-impact

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2046
JIA Limin , YAO Dechen , LI Xiaofeng , QIN Yong , CAI Guoqiang
Pedestal looseness and rub-impact are two important faults in rotating machinery. Once the Pedestal looseness is developed in a rotor system, the rotor is more likely to make contact with stator under tight clearance conditions. Due to the presence of both Pedestal looseness and rub-impact, the whole system becomes highly nonlinear and instability. The present study is aimed to simulate a chaotic system of the nonlinear rotor system and the system can adaptively be converted to normal working state under the circumstance of the chaotic state occasioned by outside perturbation for the complicated chaotic system. The nonlinear dynamic equations of rotor-bearing system with coupling faults of pedestal looseness and rub-impact force are derived and a multi-parameter adaptive control algorithm is given. As a result, it is found that those systems possess various nonlinear dynamical inherences. The numerical results also show that the parametric adaptive control method is appropriate to those rotor-bearing systems, outside interference under the state of chaos arising from the situation can be adaptive to adjust to normal working condition. It has strongly control capability of stability. The theoretical and practical idea for controlling rotor–bearing systems and optimizing their operation can be more precise. DOI: http://dx.doi.org/10.11591/telkomnika.v11i2.2054
Volume: 11
Issue: 2
Page: 926-934
Publish at: 2013-02-01

Simulation Biomass Effecting On Microbial Fuel Cell Electricity Properties and Substrate Degradation

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/1999
Xingguan Ma , Jiao Wang , Xiangxin Xue , Yulan Tang , Jinxiang Fu
Microbial fuel cell (MFC) mathematical model was established with suspended microorganisms, biomass on the electrode material, soluble chemical substrates and intermediary. By simulating the process of the substrate degradation, biomass growth and the electric current production process, With different initial biomass concentration, suspended microbial biomass and biomass attaching on electrode varing with time,current and charge varing with time,substrate concentration varing with time and mediator concenration varing with time were investigated. The results showed that initial suspended microbial is little, growth of biomass is main on electrode, biomass in solution grow slowly, producing electricity the main function biomass is on electrode, while initial suspended microbial concentration is high, growth of biomass is main in solution, biomass on electrode grow slowly, producing electricity the main function biomass is  in solution; the more initial suspended microbial, the faster current reaching the maximum, the more charge, the faster substrate degradation, the faster mediator variation; initial add biomass benefit to MFC producing electricity. DOI: http://dx.doi.org/10.11591/telkomnika.v11i2.1977
Volume: 11
Issue: 2
Page: 559-566
Publish at: 2013-02-01

Research on clustering protocols based on event-driven

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2039
Xiaohu Zhao , Chenjun Hu , Qianqian Zhang
In order to ensure the safety production in coal face, we need to monitor face working conditions and environment information; this paper presents a kind of clustering routing algorithm which is based on event-driven. Under normal circumstances, we improve LEACH protocol to monitor the information on the face; in an emergency, cluster head nodes in the event area will be selected based on events the degree of irritation the node residual energy and the power transmission level. The simulation results show that the agreement can quickly build a temporary path for effective data fusion, and can prolong the network lifetime. DOI: http://dx.doi.org/10.11591/telkomnika.v11i2.2046
Volume: 11
Issue: 2
Page: 871-876
Publish at: 2013-02-01

Authentication of the Command TPM_CertifyKey in the Trusted Platform Module

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2037
Donglai FU , Xinguang PENG , Yuli YANG
Trusted Platform Module (TPM) is a key component designed to enable computers achieve greater security. Several vulnerabilities discovered in the TPM highlight the necessity of formal analysis. The procedure invoking an API may be regarded as several interactive processes between the TPM and a user. As a result, the current study formalized the API specifications proposed by Trusted Computing Group (TCG) using applied pi calculus. Meanwhile, two authentication properties between them were also described in a formalized way. With the help of the tool ProVerif, the flaw of the command TPM_CertifyKey was discovered. It was also confirmed on the TPM emulator. Subsequently, the modified API was presented and its authentication properties could be satisfied after verifying again. Results show the model is valid. DOI: http://dx.doi.org/10.11591/telkomnika.v11i2.2034
Volume: 11
Issue: 2
Page: 855-863
Publish at: 2013-02-01

Specific Index Parameters definition for Quantitative Evaluation of the Dynamic Performance of the Electromagnetic Mechanism Topologies within Controllable Actuators

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2056
LOU Jie , SUN Bin , LI Qingmin
Fast electromagnetic drive mechanism shows broad application prospects in many areas, but there is still a lack of unified evaluation parameters as to evaluate the dynamic characteristics due to diversity and complexity of the mechanisms. Three interrelated evaluation parameters are presented for topology analysis, namely the electromagnetic force sensitivity coefficient, the initial time constant and the sensitivity contribution coefficient. The specific parameters based evaluation can provide a basis for structural performance assessment as well as topology optimization. Comparison between the dynamic parameters of the discoid repulsion mechanism and the solenoid thrust mechanism shows that, the discoid one is superior to the solenoid one. The proposed research is to establish a general methodology for topology analysis and optimization of the electromagnetic mechanisms. DOI: http://dx.doi.org/10.11591/telkomnika.v11i2.2066
Volume: 11
Issue: 2
Page: 998-1004
Publish at: 2013-02-01

Design and Development of Mechanical Structure and Control System for Tracked Trailing Mobile Robot

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2017
Rui Zhu , Jianxing Ren , Zhiwei Chen , Hongchuan Xu
Along with the science and technology unceasing progress, the uses of tracing robots become more and more widely. Tracked tracing robot was adopted as the research object in this paper, mechanical structure and control system of robot was designed and developmented. In mechanical structure design part, structure designed and positioned  were completed, including design of robot body, wheel, underpan, transmission structure and the positioning of batteries, control panel, sensors, etc, and then robot dynamics was analyzed; In control section, M30245 was used as the core, according to the characteristics of tracked tracing robot differential drive, realization scheme of motion control system was put forward, system drive circuit, detection module, control program were developed. System were discussed and checked through test. From this paper tracked tracing robot was researched, and a certain design and experimental basis can be provided in future research. DOI: http://dx.doi.org/10.11591/telkomnika.v11i2.1995
Volume: 11
Issue: 2
Page: 694-703
Publish at: 2013-02-01

Smooth Sliding Mode Control for Trajectory Tracking of Greenhouse Spraying Mobile Robot

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2010
Gao Guoqin , Ren Yi , Zhou Haiyan , Fang Zhiming
For the spraying mobile robot working in greenhouse, due to the inconsistency of drive motors and the rough walking surface, it is easy to track off. For the liquidity of pesticide, the load always changes even the speed jumps. Because of these uncertainties, external disturbances and the difficulty of constructing the system dynamic model, it is hard to implement the trajectory tracking control of the spraying mobile robot steadily, precisely and quickly. In order to solve the problem, a smooth sliding mode trajectory tracking control method is proposed based on the distribute control strategy for each branch. Moreover, its stability is proved using the Lyapunov function. The simulation results show that the proposed method can track the reference trajectories precisely, quickly and steadily under the strong white noise. The chattering phenomenon of the control law is restrained compared to the conventional sliding mode control. The trajectory tracking performance is better than that of the fuzzy control. The designed method is easy to realize and doesn’t need to construct the precise mathematical model, so, it affords an economical and convenient control method for solving the trajectory tracking problem of the greenhouse spraying mobile robot under various uncertain interferences. DOI: http://dx.doi.org/10.11591/telkomnika.v11i2.1988
Volume: 11
Issue: 2
Page: 642-652
Publish at: 2013-02-01

Energy-saving Routing Algorithm Based on Cluster in WSN

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2035
He Ninghui , Li Hongsheng , Gao Jing
This paper takes the improved threshold formula and cluster radios formulas to choose cluster-heads by considering energy-saving, based on typical clustering routing protocol and optimal cluster-head selection formula. In the forming stage of cluster, the proportionality principle is used to make the distribution of cluster even more reasonable and during the stable stage of cluster, the member nodes in cluster use TDMA to communicate with the cluster-head node, and cluster-head nodes communicate with base station BS via multi-hop interrupt communication manner. Then it proposed the realization of target tracking based on the energy- saving routing algorithm. Finally, it can be seen in the simulation results that on the behalf of the network lifetime and average energy consumption, energy-saving routing algorithm is more reasonable. DOI: http://dx.doi.org/10.11591/telkomnika.v11i2.2032
Volume: 11
Issue: 2
Page: 839-847
Publish at: 2013-02-01

Key Agreement Procotol in DSN

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2032
Jian Zhou , Xianwei Zhou
In space networks, the long time delay, large scale and maintainability of difficultly nature makes key management more difficult than ground wireless networks. The main challenge is how to handle 1-affects-n problem that become more serious as entities spread over a wide geographic area. To solve it, this paper proposes a one-to-many mapping shared key agreement, which is based on one-to-many encryption mechanism model. In the proposed key agreement, each entity has different decryption key and shares an encryption key. When an entity joins or leaves network, updated keys only are public encryption key and its decryption key. However, the other entities’ secret key remains unchanged, so as to each member has the ability to update key autonomously. Consequently the performance of the proposed key management scheme is unrelated to the network scale, node mobility and topology structure. It is shown that our proposed key management scheme not only improves the efficiency and flexibility for space networks, but also achieves good security properties, including forward security and backward security and many more by theoretical analyses. DOI: http://dx.doi.org/10.11591/telkomnika.v11i2.2029   
Volume: 11
Issue: 2
Page: 809-818
Publish at: 2013-02-01

Discrimination of Chinese Herbal Medicine by Machine Olfaction

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2008
Dehan Luo , Yawen Shao
“Small Sample Size” (SSS) problem would occur while using linear discriminant analysis (LDA) algorithm with traditional Fisher criterion if the within-class scatter matrix is singular. The combination of maximum scatter difference (MSD) criterion and LDA algorithm for solve SSS problem is described. It is employed to detect three kinds of Chinese herbal medicines from different growing areas by machine olfaction. Compared with PCA or PCA + LDA algorithm, the classification result was enhanced. It works out that only a few samples of Anhui Atractylodes are classified incorrectly, however, the classification rate reaches 97.8%. DOI: http://dx.doi.org/10.11591/telkomnika.v11i2.1986
Volume: 11
Issue: 2
Page: 630-636
Publish at: 2013-02-01

A Quick Image Registration Algorithm Based on Delaunay Triangulation

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2026
Yongmei Zhang , Li Ma , Rui Zhang
The traditional image matching algorithms adopt more complex strategies when dealing with mismatch caused by a lot of noise. In this paper, a simple, intuitive and effective noise processing algorithm is proposed based on Delaunay triangulation in computational geometry. The algorithm extracts feature points using SIFT method, respectively establishes Delaunay triangulation in multi-spectral and panchromatic images, and removes the feature points that three points are collinear and four points are on circle by Delaunay triangulation, obtains the registration images through the correspondence between the Delaunay triangulations. The effect of image registration is evaluated by objective method. In the image matching, Delaunay triangulation is introduced. The establishment of Delaunay triangulation is independent of the selection of initial values. In general, a unique Delaunay triangulation can be got when a feature point set is given, and it can provide the accuracy of the algorithm. The algorithm is simple and clear for converting a lot of mismatch noise to the operation of Delaunay triangulation. Experiment results show the algorithm can keep the good rotation feature and translation invariance in SIFT method, the number of extraction feature points has been significantly reduced in the algorithm compared with SIFT method, registration speed and accuracy are better than the registration algorithm based on conventional SIFT method. DOI: http://dx.doi.org/10.11591/telkomnika.v11i2.2004
Volume: 11
Issue: 2
Page: 761-773
Publish at: 2013-02-01
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