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23,675 Article Results

Identifying Overlapping Communities in Directed Networks via Triangles

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2700
Qingyu Zou , Fu Liu , Tao Hou , Yihan Jiang
A lot of complex systems in nature and society can be represented as the form of network. The small-scale subnets topological features are vital to understand the dynamics and function of the networks. Triangles comprised of three nodes are the simplest subnet in the network. Based on the triangle distribution of the complex network, we present a novel approach to detect overlapping community structure in directed networks. Different from previous studies focused on grouping nodes, our method defines communities as groups of links rather than nodes so that nodes naturally belong to more than one community. It can identify a suitable number of overlapping communities without any prior knowledge about the community. We evaluated our approach on several real-networks. Experimental results prove that the algorithm proposed is efficient for detecting overlapping communities in directed networks. DOI: http://dx.doi.org/10.11591/telkomnika.v11i10.3401 
Volume: 11
Issue: 10
Page: 5741-5748
Publish at: 2013-10-01

Analysis and Design of PLL Motor Speed Control System

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2690
Qi Chao Zhang
Phase-locked technology in motor speed control system has a wide range of applications, Especially for high accuracy in the motor steady speed operation situation, more and more use of phase-locked servo control system. This paper describes the block diagram and mathematical model of phase-locked control system, Shows the circuit parameter calculation method This and combined with design example analysis of phase-locked control system, Indicated through the theory and practice, using PLL can obtain good speed control precision. DOI: http://dx.doi.org/10.11591/telkomnika.v11i10.3391
Volume: 11
Issue: 10
Page: 5662-5668
Publish at: 2013-10-01

A Routing Algorithm Based on Ant Colony, Local Search and Fuzzy Inference to Improve Energy Consumption in Wireless Sensor Networks

https://ijece.iaescore.com/index.php/IJECE/article/view/5409
Mina Jafari , Hassan Khotanlou
Wireless sensor network is a new generation of networks in which the main aim is to collect data from the surrounding environment of network sensors. The major differences of wireless sensor networks with other networks are limited energy resources and relatively low processing capabilities. Therefore, managing power and reducing energy consumption are of great importance in these networks. In this paper, there was presented a mechanism for Wireless sensor network routing which can be more effective regarding the criteria of route length, end–to–end delay and network node energy for the quality of mechanism service. The proposed method used ant colony–based routing algorithm and local enquiry to find optimal routes. Also, a fuzzy inference system was used to determine the route quality which showed better performance compared with equation of route quality. The results of simulating mechanism showed that energy consumption and network efficiency had improved compared with those of previous methods.DOI:http://dx.doi.org/10.11591/ijece.v3i5.3628
Volume: 3
Issue: 5
Page: 640-650
Publish at: 2013-10-01

Power System Stability Enhancement and Improvement of LVRT Capability of a DFIG Based Wind Power System by Using SMES and SFCL

https://ijece.iaescore.com/index.php/IJECE/article/view/5403
Anju Murukeshan , R. Rajasekaran
This paper proposes a exhaustive study about the performance analysis of Doubly Fed Induction (DFIG) under abnormal condition. Now a days, majority of power network countenance the problem of over current and grid connectivity issues. SFCL (Superconducting Fault Current Limiter), which have the competence to limit the fault current and protect the equipments from damage. SMES (Superconducting Magnetic Energy Storage) is mainly used to compensate both real and reactive power variations, thus power quality can be enhanced. Co-ordinated operation of SFCL - SMES thus used to enhance the power system stability and improve the LVRT (Low Voltage Ride Through) capability of wind power generation systems. LVRT capability of wind turbine is refers to the ability of wind power system to conquer the voltage variations if there is any unwanted conditions. Here DFIG based wind turbine plant is used for consideration, because it will provide smoothened power output nearly double than a conventional generator. And it have more simple and rugged construction also.   Design of DFIG based wind power generation systems under fault condition with the help of SMES and SFCL is analysed   by means of MATLAB/SIMULINK block set.DOI:http://dx.doi.org/10.11591/ijece.v3i5.3383
Volume: 3
Issue: 5
Page: 618-628
Publish at: 2013-10-01

Several New Metrics for Evaluation of Expert Systems Based on Service-Oriented Architecture

https://ijece.iaescore.com/index.php/IJECE/article/view/5419
Ali Nayebpour , Hassan Rashidi
Modern expert systems have some limitations such as vulnerabilities, the unity of solution strategy, development problems, repair and maintenance. These limitations could be covered by Service-Oriented Architecture (SOA), due to the advantages and various applications of this architecture and its combination to expert systems. The main purpose of this paper is to survey service-oriented architecture to provide solutions for using this style in order to eliminate the short comings and optimize services in expert systems. In this paper, several metrics for evaluating expert systems based on service-oriented architecture are presented. These metrics are in six branches: agility, integrity, usability and reusability, business objectives, accessibility, offering new and applied services. For each metric some properties are presented which the expert systems show more powerful in evaluation.DOI:http://dx.doi.org/10.11591/ijece.v3i5.4032
Volume: 3
Issue: 5
Page: 688-695
Publish at: 2013-10-01

An Improved Algorithm under Error Correlation in Distributed Data Fusion

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2718
Jie Jia , Jiao Cao , Yong Yang , Shuying Huang
In distributed data fusion, the correlation between every local estimate makes an impact on the result of fusion. This paper introduces a scalar of correlation coefficient to present the correlation between local estimates, and estimate a covariance matrix in the limit of correlation. The improved algorithm put forward to use the form of Bar shalom-Campo algorithm and partly estimate the limit of correlation in order to guarantee the consistency of fusion results and effectively utilize the information of correlation. By the comparison of the simulation experiments, the fusion accuracy of the proposed algorithm is proved to be more effective than that of the Bar shalom-Campo algorithm. DOI: http://dx.doi.org/10.11591/telkomnika.v11i10.3420
Volume: 11
Issue: 10
Page: 5890-5897
Publish at: 2013-10-01

Energy-Efficient Skycube Query Processing in Wireless Sensor Networks

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2763
Zhi-qiong Wang , Shi-kai Jin , Ke Gong
With the wide application of wireless sensor network in many domains of the national economy, more and more researchers pay attentions to data management of wireless sensor network. As the main means of multi-decision and data mining, skyline query in wireless sensor network gradually becomes a focus of the researches. Resent years, skycube, an important variation of skyline query, has been deeply discussed, but due to the special properties of wireless sensor network, existing approaches could not be directly applied into the sensor environment. In this paper, skycube query in wireless sensor network is further researched and a new skycube query algorithm based on extended skyline (SCAES) is proposed in certain environment, and a new threshold skycube query algorithm based on threshold extended skyline (p-SCAES) is proposed in uncertain environment. SCAES algorithm shifts the necessary data from the network based on extended skyline and filters the data that do not belong to skycube. p-SCAES brings in the probability threshold mechanism to decrease the data transmission. Therefore, the number of data transmission in both SCAES and p-SCAES is reduced as a consequence. The experimental results show that both SCAES and p-SCAES could greatly reduce the data transmission no matter in certain or uncertain environments, while calculating the correct skycube of the network, and prolong the life span of the wireless sensor network. DOI: http://dx.doi.org/10.11591/telkomnika.v11i10.3705
Volume: 11
Issue: 10
Page: 6240-6249
Publish at: 2013-10-01

High Performance Low Power Dual Edge Triggered Static D Flip-Flop

https://ijece.iaescore.com/index.php/IJECE/article/view/5398
Gagandeep Singh , Gurmohan Singh , Vemu Sulochna
In this paper a low-power double-edge triggered static flip-flop (DETSFF) suitable for low-power and high performance applications is presented. The designed DETFF is verified at gpdk 180nm-1.8V CMOS technology. Comparison with some of the latest DETFFs shows that the proposed DETSFF can achieve the lowest power consumption, lowest clock to Q delay and thus Power-delay-product (PDP). Moreover, the proposed DETSFF comprises of only 15 transistors hence require lesser number of transistors and thus requires lesser overall silicon area.DOI:http://dx.doi.org/10.11591/ijece.v3i5.3164
Volume: 3
Issue: 5
Page: 577-583
Publish at: 2013-10-01

A 4th-order Switch-capacitor Low-pass Filter for Quartz Gyroscope Interface Circuit

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2697
Yu Fan , Yang Huijing , Li Gang
This paper presents the computer aided design of a 4th-order switch-capacitor low-pass filter applied in quartz gyroscope interface circuit. After a introduction of switch-capacitor filter (SCF) and its application in quartz gyroscope, the system-level analysis and design is given. Then the circuit design of amplifier, CMOS switch and non-overlapping clock is described. The Fourth-order low-pass SCF has been implemented under 0.5um CMOS process and simulated in computer aided design software. The final simulation results show that the passband is 99.7Hz , and the maximum pass-band ripple is about 0.14dB.The stop-band is 1KHz, and the minimum stop-band attenuation is 78.6dB. DOI: http://dx.doi.org/10.11591/telkomnika.v11i10.3398  
Volume: 11
Issue: 10
Page: 5718-5724
Publish at: 2013-10-01

A Wireless Greenhouse Monitoring System Based on Solar Energy

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2664
Liai Gao , Man Cheng , Juan Tang
To resolve the problems of complicated cabling and costly wired network in the current system, we designed a wireless greenhouse monitoring system based on ZigBee and GSM technology.  The system consists of two parts: a wireless sensor network and remote control terminal. According to parameters distribution in the monitoring regional, a wireless transmission network was formed, all of the node in the network using solar power. In the remote control terminal, the study developed a simplified expert decision system, in which the part of greenhouse control decision adopts the fuzzy decoupling control algorithm to realize the temperature and humidity decoupling control and increase the accuracy of decision-making.According to the experimental test, the monitoring system can run well under the conditions in northern China greenhouses. It can realize real-time, accurate monitoring and collecting of parameters data in the greenhouse environment; the remote control terminal can give effective decision management solutions. Our future work will mainly be solar photovoltaic panel servo system and image transmission. DOI: http://dx.doi.org/10.11591/telkomnika.v11i9.3305  
Volume: 11
Issue: 9
Page: 5448-5454
Publish at: 2013-09-02

Pulse Clean and Regeneration Control Device in Ceramic Filter

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2598
Xilian DIAO , Haiming LIU , Yang LIU
This article developed a 6120-type diesel particulate filter pulse clean and regeneration control system with a high efficiency, simple reliable use. And it has determined the spray nozzle diameter, the injection distance, the injection pressure, the pulse width, the injection time of five factor optimal fit experiment parameter. This control system can flow the type honeycomb ceramics filter to the wall to carry on the test and the research of the filtration and the regeneration; It can realize the filter filtration and the regeneration change work. DOI: http://dx.doi.org/10.11591/telkomnika.v11i9.3232 
Volume: 11
Issue: 9
Page: 4963-4972
Publish at: 2013-09-02

Network Invulnerability Assessment Technology Based on the ENI

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2589
Yuanni Liu , Hong Tang , Guofeng Zhao , Yunpeng Xiao , Chuan Xu
In this paper, we have proposed a network invulnerability assessment technique based on the entropy of node importance (ENI) determined by the node betweenness combined with node degree, which can measure the network invulnerability dynamically. Simulation results show that the ENI network entropy can accurately change its values as the network nodes removed deliberately or randomly from the network, and ENI can estimate the network invulnerability accurately, as well as can reflect the damage degree of the network according to network entropy. DOI: http://dx.doi.org/10.11591/telkomnika.v11i9.2966
Volume: 11
Issue: 9
Page: 4896-4903
Publish at: 2013-09-01

Status Quo and Prospect on Mobile Database Security

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2596
Tao Zhang , Shi Xing-jun
Mobile database is a specialized class of distributed systems. There are some security challenges because of the dispersed nature of the mobile database application and hardware deviceconstraints. Therefore, the security issue of mobile database is analyzed in this paper. We will research the security in terms of mobile device, operating system on mobile device, mobile network and mobile database. Moreover, various security vulnerabilities on mobile database is recognized. Some appropriate technique is used to deal with side affect for mobile database security. For the sake of more security, Comprehensive solution that is applied to distributed database is proposed. DOI: http://dx.doi.org/10.11591/telkomnika.v11i9.3228 
Volume: 11
Issue: 9
Page: 4949-4955
Publish at: 2013-09-01

The Application of FPGA in PWM Controlled Resonant Converter for an Ozone Generator

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/4960
Mochammad Facta , Tole Sutikno , Zainal Salam
Pulse Width Modulation (PWM) is a very common technique used in many different applications. The Conventional method its generation is the heart of the inverter system. This paper present methodology to generate Sinusoidal PWM (SPWM) signal for three-phase inverter based on EP20K200EFC484-2x Altera Field Programmable Gate Array (FPGA). Designing a PWM inverter drive using FPGA has several advantages, such as: it's quick, very modifiable, and very suitable for prototyping. In this paper, the PWM signal is used control switching action conducted by MOSFET as part of power electronics devices in resonant power converter which has 24 volt DC input voltage. As the result, by using resonant oscillation controlled by FPGA the high sinusoidal voltage until 1.0 kV peak-to peak has been generated in the load side.DOI: http://dx.doi.org/10.11591/ijpeds.v3i3.4316
Volume: 3
Issue: 3
Page: 336-343
Publish at: 2013-09-01

A Comparative Study of Z-Source Inverter Fed Three-Phase IM Drive with CSI and VSI fed IM

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/4951
Deepak Kumar , Zakir Husain
This paper cite comparative performance characteristics of Z-Source inverter fed IM drives with mostly used VSI & CSI fed IM drives. ZSI has both voltages buck and boost capabilities as they allow inverters to be operated in the shoot through state. It employs an exclusive Z-Source network (LC component) to dc-link the main inverter circuit to the power source (rectifier). By controlling the shoot-through duty cycle, the inverter system using IGBTS reduces the line harmonics, improves power factor, increases reliability and extends output voltage range. It has reduced harmonics, low switching stress power and low common mode noise as compared to VSI. Simulation results are given to compare the behavior of conventional and proposed topology and also demonstrate the new features of the improved topology i.e ZSI fed IM. Simulation results of  ZSI fed IM gives different performance characteristics as compared to VSI & CSI fed IM drives such as its stator & rotor current characteristics, speed characteristics , torque characteristics which put a gloss on the VSI fed IM performance.DOI: http://dx.doi.org/10.11591/ijpeds.v3i3.3869
Volume: 3
Issue: 3
Page: 259-270
Publish at: 2013-09-01
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