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23,675 Article Results

A New Genetic Algorithm and Its Application in Evaluating Chorus Course

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2515
Xia Bing
Implementing course evaluation is an effective way to improve university course management level, and how to evaluate university course is one of the difficulties and hot research fields for the researchers related. The paper takes university chorus course evaluation for example and presents a new model for evaluating university course evaluation based on data mining technology. First an evaluation indicator system of university chorus course evaluation with three grades is designed; Second, aiming at the shortages of the existing BP neural network algorithm of data-mining for evaluating innovation education performance, genetic and BP neural network algorithm are integrated  and some improvements are advanced to speed up the convergence and simplify the structure and to improve evaluating accuracy of the original BP model. Finally the model is realized with the data from three universities and the realization of the experimental results show that the model can improve algorithm efficiency and evaluation accuracy and can be used for university chorus course evaluation practically. DOI: http://dx.doi.org/10.11591/telkomnika.v11i8.3074 
Volume: 11
Issue: 8
Page: 4517-4522
Publish at: 2013-08-01

Error Model and Accuracy Calibration of 5-Axis Machine Tool

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2480
Fangyu Pan , Ming Li , Jian Yin
To improve the machining precision and reduce the geometric errors for 5-axis machinetool, error model and calibration are presented in this paper. Error model is realized by the theory of multi-body system and characteristic matrixes, which can establish the relationship between the cutting tool and the workpiece in theory. The accuracy calibration was difficult to achieve, but by a laser approach-laser interferometer and laser tracker, the errors can be displayed accurately which is benefit for later compensation. DOI: http://dx.doi.org/10.11591/telkomnika.v11i8.3022
Volume: 11
Issue: 8
Page: 4251-4259
Publish at: 2013-08-01

Parallel Computing Properties of Tail Copolymer Chain

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2491
Hong Li , Bin Gong , He-Bei Gao , Chang-Ji Qian
The properties of a AB diblock copolymer chain are calculated by Monte Carlo methods. Monomer A contacting to the surface has an adsorption energy E=-1 and monomer B E= 0. The polymer chain is simulated by self-avoiding walk in simple cubic lattice. The adsorption properties and the conformation properties of the polymer chain are computed by using message passing interface (MPI). The speedup is close to linear speedup by parallel computing independent samples. DOI: http://dx.doi.org/10.11591/telkomnika.v11i8.3033  
Volume: 11
Issue: 8
Page: 4344-4350
Publish at: 2013-08-01

Simulation Modeling for Electrical Switching System of Hydropower Station

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2547
Ran HU , Xianshan LI
This paper proposes a simulation modeling method for the electrical switching system of hydropower station, which is a sub-topic for Hydropower Station Simulation Training System. The graphics model of commonly used electrical switch equipment is developed with a certain software. As vast and different types of Hydropower station circuit breakers and associated grounding switches, and each specific action of the switch process is not same, so the modular modeling method is described to solve the problem. According to the role and status in power plant, electrical switch system is divided into several sub modules, among which a number of small modules are sorted in. In each sub module, a common model is developed. Besides, the application method that the network topology analysis algorithm used in electrical switching system simulation logic judgment is introduced. With the ‘connecting line fusion’ technique, logic function expression member information table is automatically generated, thereby enhancing the suitability for the electrical switch simulation model. The methods mentioned above assure the real-time, typicality and flexibility in simulation, and have been successfully used in the development of a large hydropower station simulator. DOI: http://dx.doi.org/10.11591/telkomnika.v11i8.3135
Volume: 11
Issue: 8
Page: 4751-4756
Publish at: 2013-08-01

0.18μm CMOS Low Voltage Power Amplifier For WSN Application

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2508
Wu Chenjian , Li Zhiqun , Yao Nan , Zhang Meng , Chen Liang , Cao Jia
This paper presents the design of a Class A/B power amplifier (PA) for 2.4-2.4835GHz Wireless Sensor Network (WSN) system in 0.18μm CMOS technology. The PA adopts the single-stage differential structure and the output power of the PA can be controlled by switching the sizes of transistors. Seven different level of output power can be obtained through a three- bit control code. The tested results shows that the proposed PA achieves power added efficiency (PAE) of 26.73% while delivering an output power of 6.35dBm at 1dB compression point. Its power gain is 15.87dB. With a low DC voltage supply of 1V, its power consumption is 15.3mW. The PA die size is 1070×610μm2. DOI: http://dx.doi.org/10.11591/telkomnika.v11i8.3050
Volume: 11
Issue: 8
Page: 4470-4476
Publish at: 2013-08-01

Research on the Wind Power Penetration Limit in Power System

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2503
Yang Zhang , Hongbo Zhang , Degui Yao , Qiang Li
An approach to calculate the wind farm penetration capacity based on chance constrained programming combining with transient check was presented. A novel model for programming penetration of wind farm under indeterminacy operating mode was presented. Constraint condition consisted of conventional generator output limits, system spinning reserve, transmission lines capability, nodal voltage, system frequency etc, and genetic algorithm based on Monte Carlo simulating was used to solve the problem, and the actual sample system verified the feasibility of the model and method. Results for the application of this approach revealed the influencing factors of penetration of wind farm consisted of the parallel node voltage, the output variation range of wind generating set and mean wind speed etc. The research results have important practical significance, which can guide the actual wind farms in the planning and operation analysis of reality wind farm. DOI: http://dx.doi.org/10.11591/telkomnika.v11i8.3045 
Volume: 11
Issue: 8
Page: 4433-4438
Publish at: 2013-08-01

The Study and Achieving of High-precision Data-acquisition Based on ΔΣADC

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2506
SU Shu-jing , ZHANG Hai-li
ΔΣ ADC is used more and more widely, and it is favored for the important reason of high precision. In this paper, working principle and characteristics of ΔΣ modulator and digital filter have been analyzed, and then oversampling, noise shaping and digital filtering characteristics are discussed. Finally, a practical application is illustrated and its basic structure of acquisition circuit is given, the design ideas of single-ended-to-differential driver circuit and front RC filter circuit is highlighted, and the choosing of connection method of multiple channel system is argued. DOI: http://dx.doi.org/10.11591/telkomnika.v11i8.3048 
Volume: 11
Issue: 8
Page: 4453-4460
Publish at: 2013-08-01

The Application of Virtual Instrument Technology in the Tester

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2535
Jianhua Ren , Xiaogang Guo , Yanceng Liu , Li Chen
Four-ball tester is a device which is used to evaluate the resistance of extreme pressure grease performance and wear resistance with simple structure, less fuel consumption and low cost. It has been widely used in Lubricants research. In this paper, the principle and testing equipment of four-ball tester are introduced. At the same time, some shortcomings such as inconvenient load mechanism and inaccurate measurements are presented. Friction testing and recording system is improved on the basic of the previous system to avoid the defects. Amplification ratio of the friction test result increases significantly.  To improve precision and convenience for data storing, analysis and comparison, data acquisition system is established based on LabVIEW. Then friction measurement process is visualization to realize the measured results being observed visually. DOI: http://dx.doi.org/10.11591/telkomnika.v11i8.3103
Volume: 11
Issue: 8
Page: 4662-4668
Publish at: 2013-08-01

Design of a New Propulsion Mechanism of Imitating Duck’s Webbed-feet

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2545
Yuan Dai , Zhongqiang Zheng , Jinlei Chen , Zongyu Chang
With the wide application of the underwater vehicle in ocean exploration, bionics propulsion aroused intensive interest among researchers. Bionic locomotion of aquatic animals has the advantages of highly maneuver, power-efficient endurance and so on. In the paper the mechanism of duck’s swimming is studied and a novel bionics propulsion mechanism is designed and analyzed. The mechanics of underwater vehicle is investigated by ADAMS. Dynamics response of the system is analyzed by using numerical method. The simulation results suggest that the designed propulsion mechanism can imitate the movement modes of the duck’s webbed feet, and implement the motion of vehicle in fluid environment. DOI: http://dx.doi.org/10.11591/telkomnika.v11i8.3133
Volume: 11
Issue: 8
Page: 4735-4741
Publish at: 2013-08-01

Ground Fault Line Selection with Improved Residual Flow Incremental Method

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2538
Wenhong Li , Tingqiang Guan , Xueguang Qi , Gonghua Wang
According to the shortcoming of single-phase ground fault line selection method in the resonant grounded system such as the uncertainty of its device by fast compensation with the automatic compensation equipment, an arc suppression and residual flow incremental method is proposed to effectively choose the earth fault line. Firstly, when the single-phase ground fault occurs, the arc suppression coil parameters are adjusted to realize compensation and arc suppression. Then the arc suppression coil inductance values are modulated to make the zero-sequence current of fault line changed, at the same time, the zero-sequence current value is detected and its change will be captured to select the fault line. The simulation experiments prove that the arc grounding over voltage damage can be effectively reduced by arc suppression coil full compensation and fault line can be effectively selected by arc suppression and residual flow increment method. DOI: http://dx.doi.org/10.11591/telkomnika.v11i8.3106
Volume: 11
Issue: 8
Page: 4683-4690
Publish at: 2013-08-01

Design and Realization of System Structure Based on Blackboard System

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2523
R.Z. Chu , S.J. Sun , L. Yang
This paper discusses design environment of software system structure of blackboard style, which ascertain out the job pattern the blackboard decision-making model. At last, let’s list regarding a mobile robotics architecture primary need and realize the characteristic to the blackboard system pattern in the quality demand to carry on the analysis, taking floor intelligence robot software system as example. Finally the quality and ability of the four patter in architecture classification has been compared. DOI: http://dx.doi.org/10.11591/telkomnika.v11i8.3082 
Volume: 11
Issue: 8
Page: 4580-4586
Publish at: 2013-08-01

Intrusion detection system and technology of layered wireless sensor network based on Agent

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2478
Genjian Yu , Kunpeng Weng
The intrusion detection system and technology of classified layered-wireless sensor network was able to meet the high safety requirements of wireless sensor network, it is urgent for us to improve the identification and generalization of detection system about characters of intrusion. In this paper, we design an intelligent intrusion detection system which realize intelligence, the effective and direct way was to add the methods,  and it was used for identification and generalization of intrusion characters to the Agent function of intrusion detection. It could obtain credible judgment by updating and examining the database for the actions which the general misuse detection or anomaly detection were not sure if the intrusion was formed. DOI: http://dx.doi.org/10.11591/telkomnika.v11i8.2347
Volume: 11
Issue: 8
Page: 4238-4243
Publish at: 2013-08-01

Design of an Integrated Controller based on ZigBee Wireless Network

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2501
Zhongbao Ji
There are many different home appliances in our home, for example Lamps, Television, DVD player, etc. Moreover, the appliances are usually controlled by different controller using IR (Infra-Red) signal. This brings our life many inconveniences, and many resources are wasted. Therefore, we propose an integrated controller. It can control these various appliances, only a single one. In order to realize the purpose, the integrated controller must have previous preparations, because the appliances have their different IR controlling signals. Therefore, the integrated controller must “learn” the IR signals from their own controllers, and save them inside. Because the radiation range of IR signal is limited, and the appliances are distributed in different rooms, we propose a novel wireless network based on IEEE802.15.4, especially ZigBee protocol, to transmit the controlling signals from the integrated controller. The proposed scheme consists of two main parts. The one part is the hardware design, include the integrated controlled with ZigBee transmission device and the terminal control module with ZigBee-IR conversion, which converts a control signal transferred through the ZigBee network into an IR typed control signal. The terminal control module is based on CC2430 as the controller core. The other is the software design. The software part uses IAR Embedded Workbench. Based on Zstack-1.4.2-1.1.0 protocol provided by TI, man can program the control codes of the system. The proposed scheme can also provide the well-defined interface and the necessary basis for preparing the smart home system. DOI: http://dx.doi.org/10.11591/telkomnika.v11i8.3043
Volume: 11
Issue: 8
Page: 4414-4421
Publish at: 2013-08-01

Outage Performance Based on Optimal Relay Location in Multi-node Relay Network

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2471
Yaolian Song , Yubin Shao , Hua Long , Xuanhui Xi
In this paper, we investigate the outage performance of multi-node relay network under equal power allocation (EPA) scheme. Due to the mobility of relay nodes, we proposed to design a method that considers random relay location based on random model. We conduct deep experiments which demonstrate that there exists optimal relay location to minimize the outage probability of multi-node relay networks. Finally, simulation results show that the outage performance of the multi-node relay network is closely related to the relay location. DOI: http://dx.doi.org/10.11591/telkomnika.v11i8.2742
Volume: 11
Issue: 8
Page: 4183-4189
Publish at: 2013-08-01

Micro Device Modeling Method and Design for Manufacturability

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2522
Zheng Liu , Bo Sun
The micro device designing flow begins with the mask design currently, which is not intuitive for designer and sometime made them confused. As a result, the manufacturability is hard to prove in advance with the traditional designing way. Especially for surface micro-machined device with multiple structural layers, the 2D mask design cannot ensure the fabrication of complex 3D device with high yields reliably. The rise of structural designing strategies gave a direction to change the traditional habit. On the other hand, the top-down method provides the advanced designing flow, which begins with the system level design. However, there still some key technologies to study further because of the novel design procedure. To improve the manufacturability of micro device, the designing flow based on design for manufacturability methodology is presented, which draw on the advantages and experience of the mechanical design method. The key technologies on the structural design level, the processes planning level and the fabricating level are introduced correspondingly. In addition, we present the framework to implement the method. DOI: http://dx.doi.org/10.11591/telkomnika.v11i8.3081 
Volume: 11
Issue: 8
Page: 4572-4579
Publish at: 2013-08-01
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