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23,675 Article Results

Research of IOTs Complex Event for Supply Chain Application

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2486
Li Juntao , Cheng Xiaolin , Lin Gang
In order to solve the logic fault of Internet of things technology applied in the supply chain system, this paper presents processing framework which is based on the context of complex event processing technology.At first, paper analysis the hierarchy of processing framework oriented supply chain applications, and then put forward the situation model of event flow based on complex event, including the establishment of the model, the definition of the event as well as the event description language.The context-aware framework based on complex event processing technology can solve the problem that the underlying data cannot be used efficiently bythe upper, which is proved bya typical case existingin the supply chain.As a result, it can improve the reaction speed of the supply chain system, reduce supply chain inventory as well as bullwhip effect.  DOI: http://dx.doi.org/10.11591/telkomnika.v11i8.3028
Volume: 11
Issue: 8
Page: 4296-4305
Publish at: 2013-08-01

An Intelligent Greenhouse Control System

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2529
Yang Jiaqiang , Jin Yulong , Gao Jian
Because the greenhouse control systems designed in the past are not adaptable in practice, a new greenhouse control system based on RS485 bus is realized in this paper. A new smart sensor block is developed in the system to acquire field environment factor, which can reduce complex routing and increase reliability of the whole system. The model of solar greenhouse is introduced and fuzzy control is adopted in control unit. Besides, a friendly human-computer interface is developed by LabVIEW. The proposed system has been verified by the experiments in the control of medium single-span greenhouses. DOI: http://dx.doi.org/10.11591/telkomnika.v11i8.3088 
Volume: 11
Issue: 8
Page: 4627-4632
Publish at: 2013-08-01

Optimal Placement of D-STATCOM Using Hybrid Genetic and Ant Colony Algorithm to Losses Reduction

10.11591/ijape.v2.i2.pp53-60
Askar Bagherinasab , Mahmoud Zadehbagheri , Saifulnizam Abdul Khalid , Majid Gandomkar , Naziha Ahmad Azli
In this work, a modern algorithm by hybrid genetic algorithm and ant colony algorithm is designed to placement and then simulated to determine the amount of reactive power by D-STATCOM. Also this method will be able to minimize the power system losses that contain power loss in transmission lines. Furthermore, in this design a IEEE 30-bus model depicted and three D-STATCOM are located in this system according to Economic Considerations. The optimal placement of each D-STATCOM is computed by the ant colony algorithm. In order to optimize placement for each D-STATCOM, two groups of ant are selected, which respectively located in near nest and far from the nest. Moreover, for every output simulation of D-STATCOM that is used to produce or absorb of reactive power, a genetic algorithm to minimizing the total network losses is applied. Finally, the result of this simulation shows net losses reduction about 150% that it verifies the new algorithm performance.
Volume: 2
Issue: 2
Page: 53-60
Publish at: 2013-08-01

Smart Power Transmission System Using FACTS Device

10.11591/ijape.v2.i2.pp61-70
Qazi Waqar Ali , Azzam ul Asar
Making of smart grids puts mounting pressure on the nation’s aging electric power transmission system. Just planting additional towers and stringing more line won’t practice the nation’s electric power transmission infrastructure to meet up the energy challenges ahead. Smart grids stand geared up to play a much larger role in the energy equation for reduction of transmission line losses. The FACTS controllers come out with the capability of enhancing transmission system control, reliability, and operation. This paper will discuss and express how Static Synchronous Compensator (STATCOM) has effectively been applied to power system for efficiently regulating system voltage and thus increase system load ability. This paper investigates the effects of (STATCOM) on voltage stability of a power system at different positions.The simulation analysis of this paper can be used as guideline for power industry. The study is thereby simulated using the MATLAB/SIMULINK software and simulation results show that STATCOM is effective in midpoint voltage regulation on transmission line. In this paper comparison is also performed between STATCOM and SVC under fault condition and it is proved that STATCOM have the capacity to provide more capacitive power for the period of a fault than SVC.
Volume: 2
Issue: 2
Page: 61-70
Publish at: 2013-08-01

Wi-Fi Protocol Vulnerability Discovery Based on Fuzzy Testing

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2558
Kunhua Zhu , Guohong Zhu
To detect the wireless network equipment whether there is protocol vulnerability, using the method of modular design and implementation of a new suitable for Wi-Fi protocol vulnerability discovery fuzzy test framework. It can be independent of its transmission medium, produce deformity packet and implementation of the attack on the target system. The author firstly describes the wireless network protocol vulnerability discovery and fuzzy test in this paper，then focused on the test frame technical scheme, detailed technical realization and so on, and its application are analyzed. In the experimental stage the fuzzy test is applied to a wireless networks gateway, the test results show that the fuzzy test framework can be well applied to the wireless network equipment agreement loophole mining work. DOI: http://dx.doi.org/10.11591/telkomnika.v11i8.3147 
Volume: 11
Issue: 8
Page: 4832-4840
Publish at: 2013-08-01

A Framework For Concept Drifting P2P Traffic Identification

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2488
Guanghui Yan , Minghao Ai
Identification of network traffic using port-based or payload-based analysis is becoming increasing difficult with many Peer-to-Peer (P2P) application using dynamic ports, masquerading techniques, and encryption to avoid detection. To overcome this problem, several machine learning technique were proposed to classify P2P traffics. But in the real P2P network environment, new communities of peers often attend and old communities of peers often leave. It requires the identification methods to be capable of coping with concept drift, and updating the model incrementally. In this paper, we present a concept-adapting algorithm CluMC which is based on streaming data mining techniques to identify P2P applications in Internet traffic. The CluMC use micro-cluster structures which contain potential micro-cluster structures and outlier micro-cluster structures to classify the P2P traffic and discover the concept drift with limited memory. Our performance study over a number of real data sets that we captured at a main gateway router demonstrates the effectiveness and efficiency of our method. DOI: http://dx.doi.org/10.11591/telkomnika.v11i8.3030
Volume: 11
Issue: 8
Page: 4317-4326
Publish at: 2013-08-01

Distributed Generation Allocation to Improve Steady State Voltage Stability of Distribution Networks Using Imperialist Competitive Algorithm

10.11591/ijape.v2.i2.pp71-78
Navid Ghaffarzadeh , Masoud Akbari , Amir Khanjanzadeh
In this paper, a new method is proposed to optimal distributed generation allocation for stability enhancement in radial distribution networks. Voltage stability is related with stable load and acceptable voltage in all buses of system. According to the time spectrum of the incident of the phenomena the instability is divided into steady state and transient voltage instability. The analysis is accomplished using a steady state voltage stability index which can be evaluated at each node of the distribution system. Different optimal locations and capacities are used to check this effect. The location of DG is more important in comparison with the capacities and has the main effect on the network voltage stability. Effects of capacity and location on increasing steady state voltage stability in radial distribution networks are evaluated through Imperialist Competitive Algorithm (ICA) and at the end the results are compared to particle swarm optimization and genetic algorithm on the terms of speed, accuracy and convergence.
Volume: 2
Issue: 2
Page: 71-78
Publish at: 2013-08-01

A Fuzzy-PD Controller to Improve the Performance of HVDC System

10.11591/ijape.v2.i2.pp79-88
Mohammad Sarvi , Majid Keshmiri
In this paper, a fuzzy self adjustment controller has been designed for using in control of a high voltage direct current (HVDC) system. Fuzzy logic method via fuzzy rules based on simple experimental logical proofs, selects the coefficient of PD controller. In order to investigate the performance and accuracy of the proposed control method, a Cigre system is considered and analyzed. The proposed fuzzy - PD controller is compared with conventional PD controller. To achieve this purpose, the operations of designed controllers are investigated for different conditions. Fuzzy controllers used to control of inverter and rectifier converters, improve significantly system responses and performances as well as DC power recovering, especially on hard faults. The HVDC control system with fuzzy controllers in soft faults and variations with small amplitude, are similar conventional control, but on hard faults and variation with large amplitude, the performances are improved in compare with conventional control.
Volume: 2
Issue: 2
Page: 79-88
Publish at: 2013-08-01

A Method of Discovering Tolerance Markov Blanket Based on Completely Dependent Unknown Components

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2520
Hongzhou He , Mingtian Zhou
A novel tolerance feature subset selection method from incomplete data set, denoted by MaxG-IIAMB, is proposed to pick out the Markov-boundary (MB), the minimal subset of features, of target variable but without making any assumption about the unknown component distribution. The classification experimental results of risk factors observed in a sample of 1841 employees of a Czech car factory demonstrate the practicability and superiority of our method over the classical expectation-maximization (EM) and available case technique (ACA). DOI: http://dx.doi.org/10.11591/telkomnika.v11i8.3079
Volume: 11
Issue: 8
Page: 4556-4564
Publish at: 2013-08-01

Analysis on Large Deformation Compensation Method for Grinding Machine

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2544
Wang Ya-jie , Huang Yun , Zhang Die , Zhu Deng-wei
The positioning accuracy of computer numerical control machines tools and manufacturing systems is affected by structural deformations, especially for large sized systems. Structural deformations of the machine body are difficult to model and to predict. Researchs for the direct measurement of the amount of deformation and its compensation are farly limited in domestic and overseas,not involved to calculate the amount of deformation compensation. A new method to compensate large deformation caused by self-weight was presented in the paper. First of all, the compensation method is summarized; Then,static force analysis was taken on the large grinding machine through APDL(ANSYS Parameter Design Language). It could automatic extract results and form data files, getting the N points displacement in the working stroke of mechanical arm. Then, the mathematical model and corresponding flat rectangular function were established. The conclusion that the new compensation method is feasible was obtained through the analysis of displacement of N points. Finally, the MATLAB as a tool is used to calculate compensate amount and the accuracy of the proposed method is proved. Practice shows that the error caused by large deformatiion compensation method can meet the requirements of grinding. DOI: http://dx.doi.org/10.11591/telkomnika.v11i8.3132 
Volume: 11
Issue: 8
Page: 4729-4734
Publish at: 2013-08-01

Feasibility Study of a Grid Connected Hybrid Wind/PV System

10.11591/ijape.v2.i2.pp89-98
Hussein AL-Masri , Fathi Amoura
This paper investigates the feasibility of a grid connected, large-scale hybrid wind/PV system. From data available an area called RasElnaqab in Jordan is chosen because it enjoys both high average wind speed of 6.13 m/s and high average solar radiation of 5.9KWhr/m2 /day. MATLAB and HOMER software’s are used for sizing and economical analysis respectively. Results show that76124 SUNTECH PV panels and 38 GW87-1.5MW wind turbines are the optimal choice. The net present cost (NPC) is 130,115,936$, the cost of energy (COE) is 0.049$/KWhr with a renewable fraction of 74.1%.A stepby-step process to determine the optimal sizing of Hybrid Wind/PV system is presented and it can be applied anywhere.
Volume: 2
Issue: 2
Page: 89-98
Publish at: 2013-08-01

Grounding Resistance Measurement of Transmission Towers in Mountainous Area

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2504
Xueling ZHU , Juan ZHANG , Zeng PING , Jia LIU
Due to limitations of 0.618 pole method, the triangle method and the champ ground resistance tester method on grounding resistance measurement of transmission lines and towers under conditions of complex landscape in a mountainous area, it adopts a generalized three-electrode grounding resistance measurement method which arranges electrode flexibly in the grounding resistance measurement of transmission lines and towers under conditions of complex landscape in a mountainous area, and the measurement results of the generalized three-electrode grounding resistance measurement method compares with the measurement results of the 0.618 pole method and the triangle method. Research results show that the tower grounding resistance measurement method based on the generalized three-electrode method is correct and feasible in engineering and it supplies a new method for the overhead transmission line and tower grounding resistance measurement under conditions of complex landscape in a mountainous area. DOI: http://dx.doi.org/10.11591/telkomnika.v11i8.3046
Volume: 11
Issue: 8
Page: 4439-4446
Publish at: 2013-08-01

Voltage and Reactive Power Control of Front-end Speed Controlled Wind Turbine via H∞ Strategy

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2472
Haiying Dong , Shuaibing Li , Lixin Cao , Hongwei Li
According to the characteristics like rapidity, time variability and the uncertainty of the input mechanical torque of the front-end speed control wind turbine (FSCWT) with directly grid-connected electrically excited synchronous generator (EESG), a double-loop H∞control approach was proposed. In which, a simpilified structure of brushless excitation system was used. For the inner loop, first H∞excitation controller was designed for realizing a fast excitation control; the second H∞power system stabilizer (PSS) was designed by solving the Riccati equation for the purpose of eliminating the oscillation and desynchronization of generator may caused by fast excitation and improving the system transient stability, which ensured the generator with stable operation in grid-connecting and effectively solved the contradiction between fast excitation and transient stability. Then the designed H∞controllers were applied to the voltage and reactive power control system (VRCS), which realized the output voltage and reactive power control requriements by tuning the weighting functions. Simulation results show that the double-loop H∞control approach was more effective than the single H∞excitation control in voltage and reactive power control of FSCWT. DOI: http://dx.doi.org/10.11591/telkomnika.v11i8.2423
Volume: 11
Issue: 8
Page: 4190-4199
Publish at: 2013-08-01

Design and Implementation of the Application Layer Communication Protocol based on Wireless Sensor Network

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2552
Changshun Chen
The user-defined communication protocol is the key step to develop application system based on Wireless Sensor Network. Through the analysis on the application of the wireless sensor network architecture and communication needs, a kind of simple and practical application layer communication protocol with detailed design of protocol data structure is proposed in this paper. Based on that, a communication protocol programming prototype is written in C# language. Through the test of wireless sensor network intelligent community monitoring system, it proves that the system data transmission based on this proposal is reliable and programming is simple and convenient. DOI: http://dx.doi.org/10.11591/telkomnika.v11i8.3141
Volume: 11
Issue: 8
Page: 4788-4793
Publish at: 2013-08-01

Design and Compared of Two Types of Microwave Moisture Instruments

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2514
Xibin Bu , Zelun Li
In this paper, two types of microwave moisture measurement instruments were designed and compared with microwave dryness method and attenuation method separately. Compared with traditional moisture measurement instruments, the moisture instrument with microwave dryness method can detected the moisture content rapidly with high precision. On the other hand, the moisture instrument with microwave attenuation method can detect the moisture content with much higher speed but low precision, which can be used in the online measurement system. DOI: http://dx.doi.org/10.11591/telkomnika.v11i8.3073
Volume: 11
Issue: 8
Page: 4512-4516
Publish at: 2013-08-01
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