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23,675 Article Results

Vehicle Routing Optimization in Logistics Distribution Using Hybrid Ant Colony Algorithm

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2644
Chengming Qi
The Vehicle Routing Problem (VRP) is an important management problem in the field of physical distribution and logistics. Good vehicle routing can not only increase the profit of logistics but also make logistics management more scientific. The Capacitated Vehicle Routing Problem (CVRP) constrained by the capacity of a vehicle is the extension of VRP. Our research applies a two-phase algorithm to address CVRP. It takes the advantages of Simulated Annealing (SA) and ant colony optimization for solving the capacitated vehicle routing problem. In the first phase of proposed algorithm, simulated annealing provides a good initial solution for ant colony optimization. In the second phase, Iterative Local Search (ILS) method is employed to seeking the close-to-optimal solution in local scope based on the capacity of the vehicle. Experimental results show that the proposed algorithm is superior to original ant colony optimization and simulated annealing separately reported on partial benchmark problems. DOI: http://dx.doi.org/10.11591/telkomnika.v11i9.3284
Volume: 11
Issue: 9
Page: 5308-5315
Publish at: 2013-09-01

Timed Behavioral Specification in Globally Asynchronous Locally Synchronous systems

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2619
Yu Tonglan , Liu Jie , Zhang Juan , Wu Qujing
In this paper, we propose a PolGALS language for safety critical GALS(Globally Asynchronous Locally Synchronous) systems. The formal syntax and semantics are given and its compilation and implementation are defined. The language is based on timed CSP(communicating sequential process) style rendezvous between clock domains, aiming at modelling the timed behavioral of safety critical GALS systems. PolGALS is used to design timed behavioral pattern to implement timing requirements, e.g. delay, timeout, deadline, timed interrupt,etc. PolGALS provides a mechanism for implementation of timed behavioral pattern and potential for their formal verification because it is based on a PolGALS model of computation and its formal semantics. DOI: http://dx.doi.org/10.11591/telkomnika.v11i9.3257
Volume: 11
Issue: 9
Page: 5119-5125
Publish at: 2013-09-01

Performance Analysis of Field Orientation of Induction Motor Drive Under Open Gate of IGBT Fault

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/4956
Zakaria Mohamed Salem , Mahmoud Mohamed Elkholy
This paper  presents a performance analysis of three phase induction motor drive system when fed from three-phase inverter with one IGBT open gate. The drive system is based on indirect rotor field oriented. The performance characteristics of the drive are investigated at healthy operating condition and at faulty condition with IGBT of upper phase leg is opened. The Total Harmonic Distortion of phases current in case opened IGBT are derived. The Simulation of the case study is carried out by using the Matlab/Simulink package on 1.1 kW, 220/380V, 50 Hz three phase induction motor.DOI: http://dx.doi.org/10.11591/ijpeds.v3i3.4310
Volume: 3
Issue: 3
Page: 304-310
Publish at: 2013-09-01

Linear Modelling for Spectral Images Based on Truncated Fourier Series

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2636
Qiao Chen , Songhua He , Xiangyang Xu , Bo Li
Reflectance spectra of hyperspectral images of the natural scenes are supposed to represent the real world better than any certain classes of natural and man-made spectral reflectance. But spectral images contain a large volume of data and place considerable demands on computer hardware and software compared with standard trichromatic image storage and processing. Although principal component analysis (PCA) based low-dimensional linear models have been widely used in spectral image encoding and compression, there is no a single PCA linear model derived from one data set can be guaranteed to accurate represent other data sets. In this study, we proposed a spectral image encoding method by a single linear model constructed by truncated Fourier series, in which a limited number of parameters that is proportional to the highest frequency cut off if the low-pass hypothesis is valid for any of the data sets. In this paper, several groups of hyperspectral images have been processed using truncated Fourier series, the encoded image are analysed in terms of chromaticity and spectral root mean square (RMS) errors. Results show spectral images can be efficiently compressed when the frequency reach certain limit, and the color information can be well preserved, but there are also large variations across different data sets. DOI: http://dx.doi.org/10.11591/telkomnika.v11i9.3275 
Volume: 11
Issue: 9
Page: 5245-5252
Publish at: 2013-09-01

Comprehensive Evaluation of Examination Quality Based on Fuzzy AHP

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2655
Linlin Liu , Hong Chen , Ruixin Zhang
Examination is undoubtedly one of good means to evaluate what and how much the examinees have mastered. Effective evaluation of the quality of curriculum examination will not only contribute to scientifically testing the students’ mastery of the knowledge but also help instruct the teachers to set scientific tests. This paper establishes the evaluation indexes of curriculum quality, calculates the weight of them, and gives effective evaluation of the quality of course examination by using the fuzzy AHP comprehensive evaluation, which has practical values in improving the efficiency of teaching evaluation. The research for the examination quality evaluation system is to accurately reflect and describe the rationality of examination quality index system so as to improve the rationalization level of examination papers. DOI: http://dx.doi.org/10.11591/telkomnika.v11i9.3295
Volume: 11
Issue: 9
Page: 5384-5394
Publish at: 2013-09-01

Soft Switched Multi-Output PWM DC-DC Converter

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/4959
Rashmi Sharma
In this paper, a new soft switched cell that overcomes most of the drawbacks of the normal "hard switched-pulse width modulation" converter is proposed to contrive a new family of soft switched PWM converters. All of the semiconductor devices in this converter are turned on and off under exact or near zero voltage switching (ZVS) and/or zero current switching (ZCS). No additional voltage and current stresses on the main switch and main diode occur. A push-pull converter equipped with the proposed snubber cell is analyzed in detail. The predicted operation principles and theoretical analysis of the presented converter are verified with a prototype of a 50W PWM push-pull multi-output converter with insulated MOSFET and for regulation of slave outputs magnetic amplifier post regulators are considered as post regulators. Moreover; this multioutput converter has a simple structure, low cost, and ease of control circuitry.DOI: http://dx.doi.org/10.11591/ijpeds.v3i3.4024
Volume: 3
Issue: 3
Page: 328-335
Publish at: 2013-09-01

Flyback Topology TEM Bipolar Pulse Transmitter

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2612
Guo-fu Wang , Yong-shou Yang , Jin-cai Ye
In the fields of transient electromagnetic (TEM) geophysical exploration, it is necessary to create a bipolar pulse current source with decline edge of high linearity, short turn-off time and high stability. In order to improve detection equipment’s practicality, it’s urgently needed to miniaturize and improve the reliability of the detection equipment. In this paper, a clamp and prompt drop bipolar pulse current circuit based on Flyback topology is represented, which can accelerate the decline of load current by clamping the coil load with fixed high voltage in the period of current declining. Also, because of this circuit’s low power consumption and significantly improvement of the transmitter’s energy utilization, chassis’s cooling equipment can be greatly reduced and it’s easier to miniaturize the transmitter. To start with, the principle of this circuit is represented. Then, the method is given to select the optimal values of circuit’s components. Finally, the results of simulation proves the proposed circuit meeting the requirements much better than those reported, with shorter turn-off time, higher linearity, less energy consumption. In general, this circuit has been successfully applied to a new type of detection equipment. DOI: http://dx.doi.org/10.11591/telkomnika.v11i9.3250
Volume: 11
Issue: 9
Page: 5068-5075
Publish at: 2013-09-01

Optimizing Process and Design of Die with CAE on the Car

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2618
Su Chunjian , Xie Zhendong , Guo Sumin , Tian Heqiang
The traditional mould design method mainly relies on the experience, it needs repeated debugging and processing which prolongs the mould development time and increases the mould manufacturing cost. The modern advanced mold design uses the finite element analysis software to do numerical simulation on the forming process of the die and optimizes the parameters of the mould which is very helpful for improving the precision of mould design.Take the rear quarter panel of car as an example, using the DYNAFORM finite element software to do simulation on blank forming process to control the springback after unloading on the shallow and deep parts and design the mould of rear quarter panel based on optimization results, so as to improve the accuracy of the mold and reduce the mold development time and the mould cost.  DOI: http://dx.doi.org/10.11591/telkomnika.v11i9.3256
Volume: 11
Issue: 9
Page: 5112-5118
Publish at: 2013-09-01

Implementation of MATLAB Based Flux Linkage Characteristics Model of 8/6 SRM

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/4950
Yogesh Pahariya , Rakesh Saxena
This paper is describes the method of measuring the flux linkage versus current and rotor position of SRM for submersible pump application. The knowledge of flux linkage characteristics of motor is utilized for determination of performance of motor, design of converter and rotor position. Proposed experimental setup is finding the flux linkage characteristics of motor and their modeling in MATLAB is also designed using Fourier cosine coefficients. Developed model is compared with experimental results.DOI: http://dx.doi.org/10.11591/ijpeds.v3i3.1842
Volume: 3
Issue: 3
Page: 251-258
Publish at: 2013-09-01

Architecture Design of the Cladding Part Modeling System

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2635
Yang Junru , Sun Hong , Zhang Lili , Zhang Daozhong , Zhang Yuekan
The cladding part is a new type of layered heterogeneous material part with three layers of the substrate, the interface and the clad. According to the part unique material composition and structural characteristic, based on the hierarchical modeling method, the software architecture design of the cladding part modeling system was researched. Using UML (Unified Modeling Language) and the software Rational Rose, the use cases, static logic, dynamic logic and physical deployment of the modeling system were described with the use case diagram, class diagrams, communication diagrams, components diagram and deployment diagram. The research results can guide the development process of the cladding part modeling system with high stability and reliability. DOI: http://dx.doi.org/10.11591/telkomnika.v11i9.3274
Volume: 11
Issue: 9
Page: 5237-5244
Publish at: 2013-09-01

Rough Sets Algorithm and Its Application in Fault Diagnosis

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2667
Huiling Liu , Hongxia Pan , Aiyu Wang
Gearbox is one of the most complicate rotary mechanical apparatus, the fault signal shows non-linear and non-stationary, and how to recognize the faults effectively is a key issue. A novel method based on wavelet packet transform and rough sets theory was presented for fault diagnosis of gearbox. First, the vibration signals were decomposed into eight bands from low frequency to high frequency by wavelet packet transform, energy characteristics were extracted as the condition attributes. Second, an improved NaiveScaler algorithm was put forward to discrete continuous attributes in the case of assuring classification ability. A new reduction algorithm based on condition equivalence classifications was proposed to delete the redundant features, which could improve the reduction efficiency. Lastly the decision rules were drawn and utilized to test the samples. The results show that the method could obtain more sensitive fault characteristic parameters and have better classification ability accordingly. DOI: http://dx.doi.org/10.11591/telkomnika.v11i9.3308 
Volume: 11
Issue: 9
Page: 5471-5479
Publish at: 2013-09-01

The Use of Multiband PSS to Improve Transient Stability of Multimachine Power System

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/4955
Nacim Cherif , Allaoui Tayeb , Benasla Mokhtar
With the increase in demand for electrical energy, electrical networks must constantly work near their stability limits faster and more flexible. These grids are often subject to disturbances such as short circuits which cause the loss of stability of generators and the entire network. In this work we present two different approaches to PSS (power system stabilizer), the conventional PSS and multiband PSS in order to improve transient stability of multimachine network. The latter is subjected to a short-circuit current with a duration of 200ms just 350 km from the first generator. Multiband PSS offers an additional advantage since it produces a signal stabilizing not only from the variation of the angular velocity of the rotor as well as electrical power. Instead of one, it uses three filters (Lead/Lag) independent, each optimized for vibration damping local oscillations between interconnected networks and global oscillations. Different simulations were performed using the software matlab sympower system.DOI: http://dx.doi.org/10.11591/ijpeds.v3i3.3905
Volume: 3
Issue: 3
Page: 298-303
Publish at: 2013-09-01

Transform of Lightning Electromagnetic Pulses Based on Laplace Wavelet

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2591
Qin Li , Kaicheng Li , Changhua Zhang , Xiaojing Chen
In this study, the fine structures of lightning electromagnetic pulse associated with 19 preliminary breakdown pulses, 37 stepped leaders, 8 dart leaders, 73 first and 52 subsequent return strokes were analyzed by using Laplace wavelet. The main characteristics of field waveforms such as, the correlation coefficient, the time of arrival and the dominant frequency of the initial peak field, the energy and the frequency of the power spectrum peak are presented. The instantaneous initial peak field pulse can be precisely located by the value of the correlation coefficient. The dominant frequencies of the initial peak field of PB pulses and leaders range from 100 kHz to 1 MHz, and that of the first and subsequent return strokes below 100 and 50 kHz, respectively. The statistical results show that the Laplace wavelet is an effective tool and can be used to determine time and frequency of the lightning events with greater accuracy. DOI: http://dx.doi.org/10.11591/telkomnika.v11i9.2867 
Volume: 11
Issue: 9
Page: 4911-4917
Publish at: 2013-09-01

A New Efficient Dynamic System Information Scheduling Strategy in TDD-LTE

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2668
Zhiyuan Shi , Pingbo Chen , Lianfen Huang
The TDD-LTE system information which is also necessary to communicate each other well is a kind of important message between user equipment(UE) and eNodeB. Some important parameters are provided by system information to enable the UE to camp on a cell normally and access to common channel. The system information，of course，can provide the mobility management for UE in idle mode.  On the base station side, there are two kinds of scheduling methods of in the TDD-LTE system, and they are fixed scheduling and dynamic scheduling. The MasterInformationBlock (MIB) and the System Information Block Type1 use the fixed scheduling，while the dynamic scheduling is applied to other System Information Blocks (SIB2~SIB13); and these system information are transmitted on the Downlink Shared Channel(DL-SCH). In consideration of using the radio resources reasonably and not affecting other downlink transmitted data，we proposed a dynamic scheduling strategy of system information based on the base station side. DOI: http://dx.doi.org/10.11591/telkomnika.v11i9.3309
Volume: 11
Issue: 9
Page: 5480-5489
Publish at: 2013-09-01

Research on D-S evidence reasoning improved algorithm based on Data Association

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2607
Xing Liu , Shoushan Jiang
In order to make full use of detection information, improve the anti-interference ability of the system, solve the problem of target recognition in complex environment of multi-sensor correlation detection, this paper puts forward a information fusion method between data association and D-S evidential reasoning . It discussed the condition and the method of data association, on the basis of related information extraction, the assignment probability of multi-source sensors was revised, it also established the D-S evidential reasoning algorithm for target recognition based on data association.Through the establishment of model simulation, proved that the information fusion method between data association and D-S evidential reasoning evidence reasoning has higher reliability and recognition ability than the traditional evidential reasoning method , the results verify the correctness and effectiveness of this method. DOI: http://dx.doi.org/10.11591/telkomnika.v11i9.3245
Volume: 11
Issue: 9
Page: 5037-5043
Publish at: 2013-09-01
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