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23,598 Article Results

An Improved-Hash Based Multi Dimensional Distributed Index Mechanism

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2169
Haiwen Han , Deyu Qi , Weiping Zheng
Data partition and the accordingly index technologies which could result in uniform data distribution and fast data finding are critical in high parallelism for shared nothing architecture to minimize the transaction processing time. An improved-hash based multi dimensional index mechanism is present in this paper to achieve high parallelism performance for distributed data-parallel computation in shared nothing architecture. After partitioning and storing data using improved-hash function based on partitioning column, the multi dimensional indexes based on multi columns and the corresponding data lookup procedure are constructed. Afterwards, the space complexity and time complexity are analyzed. DOI: http://dx.doi.org/10.11591/telkomnika.v11i4.2359  
Volume: 11
Issue: 4
Page: 1896-1901
Publish at: 2013-04-01

A New Harmonic Current Forecasting Method for HAPF of Micro-grid

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2185
LI Sheng-qing , ZENG Huan-yue , LIN Hong-zhi , LI Wei-zhou , XU Wen-xiang
There are a lot of power quality problems such as a large number of harmonic, caused by quickly changing diverse types of loads and power resources in micro-grid. This paper proposed a hybrid active power filte (HAPF) harmonic current prediction method based on the hybrid intelligent prediction model of Empirical Mode Decomposition (EMD) and Intrinsic Mode Regression (SVR). This method Combine the EMD method and SVR module, First, the harmonic current is decomposed into every harmonic current using EMD method; Then using different kernel function in SVR module to predict different times harmonic currents at the next time; Finally, the predicted value of each harmonic weighted summation. Simulation results show that, this method can be well to improve the prediction performance. DOI: http://dx.doi.org/10.11591/telkomnika.v11i4.2375
Volume: 11
Issue: 4
Page: 2002-2007
Publish at: 2013-04-01

Fuzzy PI Controllers Performance on Boost Converter

https://ijece.iaescore.com/index.php/IJECE/article/view/5477
Wakhyu Dwiono
Electric voltage of about 220 volts is required to supply the home appliance in Indonesia, such as for lighting lamps. When there is no 220 volts power supply, while the available voltage source is equal to the battery voltage of about 1.5 to 12 volts, it requires the voltage converter to convert a low voltage 220 volts Become. By using a transformer, it is easy to rise the AC voltage. Meanwhile for DC voltage, the transformer can not be used to raise it, Because The changing magnetic field do not occur then the output of transformer voltage is not higher but the transformer Become hot Because of DC voltage. To raise the DC voltage, DC to DC converter is needed, such as Boost Converter. Boost Converter works based on the changing current that flows through an inductor. This current change will Affect the inductor voltage change. The output voltage of boost converter has a unique comparison to the input voltage duty cycle. By adjusting the amount of the voltage duty cycle, the output voltage will be easy to control. In this paper, we presented a prototype of 12 to 220 V DC-DC boost converter, using fuzzy-PI intervention that being embedded on ATmega168 AVR microcontroller. The controller can maintain a fixed output voltage by regulating the input duty cycle. From the test results, is obtained an efficiency of 75% at 15 watts whereas percentage of error of about less than 3%.DOI:http://dx.doi.org/10.11591/ijece.v3i2.2262
Volume: 3
Issue: 2
Page: 215-220
Publish at: 2013-04-01

The Application of Multiple Attribute Decision in LED Commerce Platform

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2192
Huahuan LEI , Lilan LIU , Tao YU
The paper applied multiple attribute decision making into LED collaborative commerce platform to help customers make purchase decision. The normal customers are unfirmiliar with LED lighting product, because it is latest product in lighting industry and the attributes of LED are complicated and professional. The method analyzed the essential attributes and network attributes of LED lighting products to sequence the limited alternative. And based on the shortage of TOPSIS method, the paper combined grey correlation with TOPSIS method in order to make decision more exactly. DOI: http://dx.doi.org/10.11591/telkomnika.v11i4.2382
Volume: 11
Issue: 4
Page: 2042-2049
Publish at: 2013-04-01

Application of Support Vector Machine to Reliability Analysis of Engine Systems

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2394
Zhang Xinfeng , Zhao Yan
Reliability analysis plays a very important role for assessing the performance and making maintenance plans of engine systems. This research presents a comparative study of the predictive performances of support vector machines (SVM) , least square support vector machine (LSSVM) and neural network time series models for forecasting failures and reliability in engine systems. Further, the reliability indexes of engine systems are computed by the weibull probability paper programmed with Matlab. The results shows that the probability distribution of the forecasting outcomes is consistent to the distribution of the actual data, which all follow weibull distribution and the predictions by SVM and LSSVM can provide accurate predictions of the characteristic life. So SVM and LSSVM are both another choice of engine system reliability analysis. Moreover, the predictive precise of the method based on LSSVM is higher than that of SVM. In small samples, the prediction by LSSVM will be more popular, because its compution cost is lower and the precise can be more satisfied. DOI: http://dx.doi.org/10.11591/telkomnika.v11i7.2624
Volume: 11
Issue: 7
Page: 3552-3560
Publish at: 2013-03-21

Modeling and Performance of Microwave and Millimeter-Wave Layered Waveguide Filters

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2390
Ardavan Rahimian
This paper presents the novel designs, analysis, and performance of 4-pole and 8-pole microwave and millimeter-wave (MMW) waveguide filters for operation at X and Y frequency bands. The waveguide filters have been designed and analyzed based on the mode matching and coupled resonators design techniques employing layered technology. Thorough waveguide filters working at X-band and Y-band have been designed, analyzed, fabricated, and tested along with the analysis of the output characteristics. Accurate designs of RF waveguides along with their filters based on the E-plane filter concept have been carried out with the ability of fitting into layered technology in high frequency production techniques. The filters demonstrate the appropriateness in order to develop high-performance well-established designs for systems that are intended for the multi-layer microwave, millimeter- and sub-millimeter-waves devices and systems; with the potential employment in radar, satellite, and radio astronomy applications.DOI: http://dx.doi.org/10.11591/telkomnika.v11i7.2411
Volume: 11
Issue: 7
Page: 3523-3533
Publish at: 2013-03-20

Intra-Inter Triplet Object Interaction Mechanism in Triplet-Based Hierarchical Interconnection Network

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2393
Shahnawaz Talpur , Imran Ali Qureshi , Shahnawaz Farhan Khahro
Object oriented languages usually avoid direct message passing, due to its complicated implementation, though that is the promising way to communicate in concurrently inherited objects. With the advancement in the high performance computing system, interaction between parallel application objects onto physical cores becomes one of the significant issues, which is not fully explored yet. In object oriented programming attribute data is included in objects and their state can be changed using the methods. Objects enable massage passing to other objects interacting with each other. Comprehensive problems can be molded by object-oriented methodology, and solves difficult program running object-oriented programs.Cores communicate with each other through communicator and groups in MPI, but in our reference architecture TBHIN (Triplet Based Hierarchical Interconnection Network), the cores are already faction in Triplets. We propose IITOIM Model to improve the performance with efficient intra-inter triplet cores communication mechanism between the objects in TBHIN. DOI: http://dx.doi.org/10.11591/telkomnika.v11i7.2151
Volume: 11
Issue: 7
Page: 3546-3551
Publish at: 2013-03-20

Design of Time Synchronization Method for Real-Time EPON

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2389
Junsuo QU
Real-time performance problems are mainly obstacles on Ethernet used in industrial control. In this paper, a RT-EPON concept can be proposed, and the frame structure, the protocol of RT-EPON MAC, and time slot allocation mechanism have been designed. In a test system, the designed Mac protocol and time synchronization method have been tested, it is shown that the RT-EPON system is stable and reliable, and the BER (Bit Error Rate) is below 10-10 on the physical layer of fiber link.DOI: http://dx.doi.org/10.11591/telkomnika.v11i7.2079
Volume: 11
Issue: 7
Page: 3517-3522
Publish at: 2013-03-13

Research on Dependable Ionizing Radiation Protection based on Model i*

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2392
Tan Hai , Shahnawaz Talpur , Imran Ali Qureshi
The software’s unreliability mostly attributes to an erroneous analysis on the requirements done at the beginning. In this paper, we apply the tool of i* frame requirement modeling and build early requirement model against ionizing radiation. After finding out possible risks and corresponding solutions during the process of modeling analysis, we propose reasoning models against ionizing radiation. The radiation protection system  with  the  above models  can  figure out  the  purpose  of agents  related  to radiant source and provide normal service even when the environment software system is being interfered. It can serve the ecological and economical society with stability and development.  The model is divided into several sections. Section 1 gives the outline of the dependant software. Section 2 illustrates the  i* frame  technology. Section 3, 4 and 5 cover the topic of dependant security requirement analysis, SD&SR model on ionizing radiation respectively. Section 6 gives the conclusion. DOI: http://dx.doi.org/10.11591/telkomnika.v11i7.2020
Volume: 11
Issue: 7
Page: 3541-3545
Publish at: 2013-03-13

Effect of User’s Judging Power on the Recommendation Performance

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2391
Li-Yu Mao , Yuan Guan , Mingsheng Shang , Shi-Min Cai
In most B2Cs, such as 5-star Amazon, users’ rating capability is nonhomogeneous, which make it necessary to distinguish different users' profiles. Besides, recommender systems sometimes overlook differences among users’ judging power and simply recommend for the target users based on the preferences of his/her neighbors, leading to unsatisfactory recommendation performances. In this paper, we firstly propose a natural extension of the YZLM algorithm to get users’ judging power. Then we equally divide the users into some groups so that the intra-group users have close judging power. Through experiments on three benchmark datasets, namely MovieLens, Netflix and Amazon, we can find the interesting phenomenon which indicates a positive correlation between groups’ judging power and group’s recommendation performance. By analyzing this phenomenon in detail, we put forward some guidance to improve recommendation algorithm according to different users' judging power. DOI: http://dx.doi.org/10.11591/telkomnika.v11i7.2277
Volume: 11
Issue: 7
Page: 3534-3540
Publish at: 2013-03-13

Transmitter Station Remote Monitor System Based on Browser /Server Structure

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2129
Shanshan Li , Jian Zhou
Radio and television was an important way for people to acquire information. In order to ensure  the normal work of the transmitter,we used computer to real-time monitor the transmitter working status, find abnormal situation and handle exception in  the broadcast. Transmitter automatic monitoring and controlling system mostly hadn't been constructed or developed remote monitoring system, a few monitoring system  was based on Client/Server  structure. Browser /Server technique had a better development in monitoring field,so we realized the system Based on Browser /Server structure.The Transmitter Station Remote Monitor System Based on Browser /Server structure in the concrete realization had two innovation points:one was that the system of integral logical structure adopts Browser /Server structure of three-layer system, the other was that in the system software code realization, the page dynamic refresh of real-time monitoring and remote print adopted the Ajax technique. DOI: http://dx.doi.org/10.11591/telkomnika.v11i3.2309
Volume: 11
Issue: 3
Page: 1594-1599
Publish at: 2013-03-01

Test of DMB-T Signal Based on Software Defined Radio Technique

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2128
Shanshan Li , Jian Zhou , Yi Zhang
With the release of the standard, digital television terrestrial broadcasting is being gradually extended in many places. In order to speed up the extension and the application, also to evaluate the existing digital television terrestrial   broadcasting  system, we need a easy-to-use signal  analysis  and measurement  system. The traditional signal measurement method is through the special hardware circuit to realize, but that method is high cost, and the system structure is complex and single function. To improve the flexibility of the system , we realize the system based on virtual instrument technology. In hardware section, this thesis described the block diagram of the system and the introduction of the NI vector signal analyzer. In software part, this thesis described the overall test system based on LabVIEW and the realization of the system features multi-threading, each step of synchronization signals achieved. DOI: http://dx.doi.org/10.11591/telkomnika.v11i3.2308
Volume: 11
Issue: 3
Page: 1587-1593
Publish at: 2013-03-01

Design and Economic Study for Use the Photovoltaic Systems for Electricity Supply in Isfahan Museum Park

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/4934
Hossein Shahinzadeh , Mohammad Moien Najaf Abadi , Mohammad Hajahmadi , Ali Paknejad
Electricity production is one of the country's economic strength foundations. Therefore, it has been considered to increase electricity production and it’s value-added in recent decades. In this respect, with the orientation and access to advanced technology, application and use of clean energy and renewable systems has considerable development for human energy needed. Ease of access and use of solar energy has placed it in proper position. The sun is the largest source of earth's energy supply which energy issued from it, is used by different ways to provide energy needed (fossil fuels and non-fossil). When we know that the solar radiation energy using photovoltaic systems directly and without intermediates is converting into electrical energy, it will be more important in the energy conversion systems. In this paper the during introducing of photovoltaic systems as a new energy systems, they are described types of photovoltaic cells and its applications. Also It examines the economic issues in the power supply in Isfahan Museum Park.DOI: http://dx.doi.org/10.11591/ijpeds.v3i1.1797
Volume: 3
Issue: 1
Page: 83-94
Publish at: 2013-03-01

V2G Technology to Design a Smart Active Filter for Solar Power System

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/4928
F. R. Islam , H. R. Pota
This paper presents the implementation of Vehicle to Grid (V2G) technology for designing a shunt active filter to improve power quality of solar generation. A system model with solar generation and a dynamic model of PHEVs are introduced here based on third order battery model. A simple battery scheme is proposed for the control of the charging and discharging of the PHEVs using a power electronic interface. The active filter controller is designed based on the instantaneous power theory (p-q theory) to improve the wind generator performance through compensating the oscillating real and reactive power from PHEVs. Simulations have been carried out and demonstrate that  PHEVs have the potential to work as  active filter with solar power generator to improve power quality, dynamic power factor correction and harmonics current compensation.DOI: http://dx.doi.org/10.11591/ijpeds.v3i1.1711
Volume: 3
Issue: 1
Page: 17-29
Publish at: 2013-03-01

Multi-sensor Data Processing and Fusing Based on Kalman Filtering

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2091
Bian Guangrong , Li Hongsheng , He Ninghui
The background of this paper is the warehouse target localization and tracking system which is composed of a number of wireless sensor nodes. Firstly this paper established a model of warehouse target localization and tracking system, then a model of multi-sensor data preprocessing and data fusion was established, and self-adaptive linear recursive method was used to eliminate outliers of the original measured data. Then least squares fitting filter was used to do filtering and denoising for the measured data. In the end, the data which were measured by multi-sensor can be fused by Kalman Filtering algorithm. Data simulation analysis shows that the use of kalman filtering algorithm for the fusion of the data measured by multi-sensor is to obtain more accurate warehouse target location data, so as to increase the positioning and tracking accuracy of the warehouse target localization and tracking system.Key Words:Wireless Sensor Network,Data Fusion,Kalman Filtering DOI: http://dx.doi.org/10.11591/telkomnika.v11i3.2195
Volume: 11
Issue: 3
Page: 1266-1277
Publish at: 2013-03-01
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